JPH0516482B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a vibration mechanism for a compaction machine.

[Conventional technology]

Conventionally, as a means of vibrating the rolling wheels in order to improve compaction efficiency in compaction machines, an eccentric load is attached to the rotating shaft provided on the rolling wheel along the rotational center line of the rolling wheel, and the rotating shaft is rotated. The rolling wheels were made to vibrate up and down with respect to the ground contact portion of the rolling wheels. Since this conventional technology transmits vertical vibrations through the ground, it has the disadvantage of generating vibration pollution when installed in residential areas or near facilities that do not like ground vibration, and also has disadvantages such as hitting and destroying the aggregate of the paving mixture. It was hot.

Therefore, in Japanese Patent Application No. 58-61408, the present applicant has already provided a rotating shaft of an eccentric mass on a rolling wheel so that the center line of rotation of the rotating shaft is located on a straight line parallel to the radial direction of the rolling wheel. , is rotatably provided, and the eccentric mounting position of each eccentric mass with respect to the axis of the rotating shaft is determined with respect to the direction of the vibration-generating drive axis of the rolling wheel, and the ground contact portion of the rolling wheel is caused to vibrate in a horizontal plane by rotating. Discloses a vibration mechanism for a compaction machine configured as follows, and as an embodiment thereof, two rotating shafts are provided at left and right positions on a straight line parallel to the radial direction of the rolling wheels, and By arranging the eccentric mounting positions in opposite positions or in the same direction, we have proposed a method in which vibrations are synergized in the entire circumferential direction, left-right direction, or front-back direction of the ground contact part of the rolling wheel within a horizontal plane, but various types of compaction After repeated performance tests and experiments, we found that vibration in the entire circumferential direction had the best compaction performance. In other words, the vibration in the entire circumferential direction causes the soil particles on the ground surface to shake or knead in a cyclical manner, resulting in a suitable kneading effect, which has a very beneficial effect on water permeability, airtightness, etc. In addition to achieving better performance results in terms of compaction degree compared to vibrations in the left-right or front-back directions.

[Problem that the invention seeks to solve]

However, horizontal vibration, which is a component of vibration in the circumferential direction, acts on the suspension rubber as a force in the horizontal direction (compression direction), so vibrations that cannot be absorbed by the suspension rubber are transmitted to the frame body, causing fatigue to the operator. The problem of giving remains. This problem is caused by the fact that as the vibration force increases, the vibration force in the left-right direction also increases proportionally.

The present invention has been improved and devised in view of the above points, and aims to provide a vibration mechanism for a compaction machine that has good compaction performance, reduces transmission of vibration to the frame body, and reduces operator fatigue. be.

[Means for solving problems and their effects]

In order to solve the above-mentioned problems, the present invention rotates a rotating shaft having a rotation center line on a straight line substantially orthogonal to the rotation center line of the rolling wheel, and each having an eccentric mass at the outer end. By this, in the vibration mechanism of the compaction machine that vibrates the ground contact part of the rolling wheel in a substantially horizontal plane, a straight line perpendicular to the rotational center line of the rolling wheel is formed at a plurality of positions substantially on the rotational center line of the rolling wheel. A plurality of rotating shafts each having an eccentric mass are attached to the outer end so as to be located on a straight line in the direction of the component, and at a certain point during the rotation of each rotating shaft, a specific rotating shaft among the plurality of rotating shafts is attached. When the eccentric mass on one side is eccentric in one axial direction of the rotational center line of the rolling wheel, the eccentric mass on the other side of the specific rotating shaft or the eccentric mass on one side or the other side of the other rotating shaft One part is eccentric in the same direction as the eccentric direction of the eccentric mass on one side of the specific rotating shaft, and the other part is eccentric in the same direction as the eccentric direction of the eccentric mass on one side of the specific rotating shaft. It is characterized by varying within a range of 45°.

By adopting the above configuration, the compaction machine generates elliptical circumferential or circular vibrations with a small vibration force in the left and right directions and a large vibration force in the front and back directions in the horizontal plane. Since rolling is carried out by rolling, a good kneading effect works, improving water permeability and
In addition to exhibiting excellent effects such as airtightness, the vibration force in the left and right direction is small, so the transmission of vibration to the frame body is extremely reduced.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. FIG. 1 is a side view illustrating a compaction machine 1 to which a vibration mechanism according to the present invention is applied. Reference numeral 2 indicates a vehicle chassis in which a prime mover, a traveling device, a steering device, a driver's seat, etc. are provided, and 3 indicates running wheels provided on the chassis 2. A frame 5 for guiding rolling wheels 4 is attached to the chassis 2 via connecting pins 6.

FIG. 2 is a sectional view showing a first embodiment of the present invention. Mounting seats 7, 7 are provided on the left and right sides of the frame 5, and mounting bodies 9, 9 are fixed within the mounting seats 7, 7 via suspension rubbers 8, 8.

On the other hand, side plates 10 and 11 are provided inside the rolling wheel 4, and a hollow boss shaft 12 is fixed to the center of the right side plate 10. The boss shaft 12 is pivotally supported by the mounting bodies 9, 9 via bearings 13, 13.

A hydraulic motor 14 for excitation, which can rotate forward and reverse, is fixed to the center of the mounting body 9 on the right side, and the hydraulic motor 14
The output shaft is connected via a coupling to a hollow boss shaft 12 and a vibration driving shaft 15 that penetrates the right side plate 10 and extends to the left. The drive shaft 15
is pivotally supported by the right side plate 10 via bearings 16, 16, and one drive bevel gear 17 is provided at the tip of the drive shaft 15 on the side plate side 10.

Further, on the inner surface of the right side plate 10, brackets 21 and 2 are provided on both sides of the rotation center line A of the rolling wheel 4.
1 and 21 are provided. The brackets 21, 21, 21 have rotation center lines B and C on straight lines orthogonal to the rotation center line A of the rolling wheels 4 at a plurality of positions on the rotation center line A of the rolling wheels 4, And, so as to be located on a straight line in a direction whose component is a straight line perpendicular to the rotation center line A of the rolling wheel 4,
The first rotating shaft 18a and the second rotating shaft 18b are diametrically connected to the bearings 19, 19, 19 and 2.
It is pivotally supported via 0, 20, 20.

A driven bevel gear 22 is provided approximately at the center of the first rotating shaft 18a located close to the drive bevel gear 17, and a driven bevel gear 22 is provided near the drive bevel gear 17 at the tip of the drive shaft 15.
mesh with. Then, a driving spur gear 23 provided at an intermediate portion of the first rotating shaft 18a meshes with a driven spur gear 24 provided at an intermediate portion of the second rotating shaft 18b. The driving spur gear 23 and the driven spur gear 24 are
Each has the same number of teeth. At both outer ends of the first rotating shaft 18a and the second rotating shaft 18b, eccentric masses 25a and 2 having the same mass are respectively mounted.
5b, 25c, and 25d are attached. Note that a wheel motor 26 that drives the rolling wheels 4 is fixed to the left mounting body 9.

The eccentric masses 25a, 25b and 25c, 25
The mutual relationship of each eccentric position of d is determined as follows in the first example. That is, when the eccentric mass 25a at the one outer end of the first rotating shaft is eccentric in one direction in the axial direction of the vibration driving shaft 15,
The eccentric mass 25b at the outer end on the other side is 180° + 30° with respect to the eccentric direction of the eccentric mass 25a at the outer end on the one side.
(or 180° - 30°), and in this case, the eccentric mass 25c at the outer end on one side of the second rotating shaft is the eccentric mass 25c at the outer end on the other side of the first rotating shaft. In the same direction as the eccentric direction of the eccentric mass 25b at one end, the eccentric mass 25d at the other outer end of the second rotating shaft is parallel to the eccentric mass 25a at the outer end of the first rotating shaft. It is eccentric in the same direction as the eccentric direction of.

Next, the operation of the vibration mechanism according to the first embodiment will be explained.

With the compaction machine 1 stopped running, the hydraulic motor 14 connects the rotating shaft via the output shaft, the coupling, the vibration driving shaft 15, the driving bevel gear 17, the driven bevel gear 22, the driving spur gear 23, and the driven spur gear 24. 18
When a and 18b are rotated as indicated by the arrows, the outer peripheral end of the eccentric mass 25a rotates around the rotation center line B in the order of positions F, E, D, and G in FIG. 3, and the outer peripheral end of the eccentric mass 25b rotates in the same manner. D', G', F', E' rotate in this order, and the outer peripheral end of the eccentric mass 25c is aligned with the rotation center line C.
The outer peripheral end of the eccentric mass 25d similarly rotates in the order of J, K, H, and I.

Since the eccentric positions of each eccentric mass 25a, 25b, 25c, and 25d have the above-mentioned relationship, when the outer peripheral end of the eccentric mass 25a is at position F at one point during this rotation, the outer peripheral end of the eccentric mass 25c is Take the position H′. At this point, the outer peripheral end of the eccentric mass 25b is at position D', and the eccentric mass 25d
The outer peripheral edge of takes the position J.

At this time, each centrifugal force from position B to F, from position B to D', from position C to J, and from position C to H' is
Expressed by BF, BD′, CJ, and CH′, respectively, centrifugal forces BF and CH′ and centrifugal forces BD′ and CJ act in directions that cancel each other out, but the resultant vector of centrifugal forces is is BF−CH′cos30゜and CJ−
BD′cos 30°, the direction is from B to F and from C to J
As a result, centrifugal force acts from H toward F. Therefore, rolling wheel 4
A force α (Fig. 2) is applied that causes the to vibrate to the right.

Similarly, when the outer peripheral end of eccentric mass 25a is at position D at one point during rotation, the outer peripheral end of eccentric mass 25c is at position J'. At this point, the outer peripheral end of the eccentric mass 25b is at position F', and the outer peripheral end of the eccentric mass 25d is at position H.

At this time, position B to D, position B to F', position C
If the centrifugal forces from H and from position C to J' are respectively expressed as BD, BF', CH and CJ', the centrifugal force is
BD and CJ′ and centrifugal forces BF′ and CH act in directions that cancel each other out, but the resultant vector of centrifugal forces has a magnitude of BD−CJ′cos30° and CH−
BF′cos 30°, the direction is from B to D and from C to H
As a result, centrifugal force acts from F toward H. Therefore, rolling wheel 4
A force β (Fig. 2) acts that causes the to vibrate to the left.

Furthermore, when the outer circumferential end of the eccentric mass 25a is at position E at one point during rotation, the outer circumferential end of the eccentric mass 25b is at position G'. At this point, the outer peripheral end of the eccentric mass 25c is at position I', and the outer peripheral end of the eccentric mass 25d is at position K. At this time, as shown in FIG. 4, forces that rotate in the L direction (circumferential direction) act on the rolling wheel 4 almost synergistically. Therefore, a force θ (FIG. 2) in the longitudinal direction is applied to the ground contact portion of the rolling wheel 4 in parallel with the ground.

Similarly, at one point during rotation, when the outer circumferential end of eccentric mass 25a is at position G, the outer circumferential end of eccentric mass 25b is at position E'. At this point, the outer peripheral end of the eccentric mass 25c is at position K', and
The outer peripheral end of the eccentric mass 25d takes the position I. At this time, in contrast to the above, a force that rotates in the M direction (circumferential direction) in FIG. 4 acts on the rolling wheel 4 almost synergistically. This force is expressed as γ (Figure 2).

In this way, the eccentric masses 25a, 25b, 25
When c and 25d rotate, the centrifugal force vector α ~ θ ~ that changes moment by moment with respect to the ground contact part of the rolling wheel 4
β to γ to α act, and this grounding portion vibrates on an elliptical circumference on a horizontal plane, as shown by arrow W in FIG.

Also, while running the compaction machine 1, the eccentric mass 2
When rotating 5a, 25b, 25c, 25d,
The ground contact portion of the rolling wheels 4 performs a horizontal movement that is a combination of the above-mentioned horizontal vibration and the forward or backward movement associated with running. Therefore, whether the compaction machine 1 is running or not, the eccentric masses 25a, 25b, 25c, 25
When compaction work is performed by rotating d, the rolling wheels 4 move to shake or cyclically knead the soil particles on the ground surface, causing destruction of the aggregate of the paving mix and occurrence of hair cracks. This eliminates the problem and improves compaction efficiency.

In addition, since the compaction action is performed in the horizontal direction, due to the characteristics of the ground, the vibration damping efficiency of the ground is greater than that of vertical vibrations. Therefore, it is useful for compaction work near facilities where ground vibration is averse, and for construction of residential roads with many residences. In addition to the advantage of significantly reducing vibration pollution, the longitudinal vibrations (forces in the γ and θ directions in Fig. 2) generated as shown in Fig. Since the rotating shaft of the rolling wheel is not subjected to vibration because it acts only as a moment around it, no vibration acts on the suspension rubber, and the vibration in the left and right direction (α and β directions in Figure 2) that occurs is determined by its magnitude. It is small, and the suspension rubber acts as a force in the compression direction, and the direction of the force changes from the vertical load and driving force of the machine body, so the shearing force is a very small value. Suspension rubber that can withstand high resistance is preferably a soft material with a small spring constant, which naturally has a high vibration-proofing effect and reduces the transmission of vibration to the frame body, which has the advantage of reducing operator fatigue.

Furthermore, the compaction machine of the present invention performs compaction using elliptical circumferential or circular vibrations that have a small vibration force in the left-right direction and a large vibration force in the front-rear direction with respect to the direction of movement in the horizontal plane. Because of this, even if there is a large vibration force, the effect of vibration on the suspension rubber is small and the effect of kneading is as good as vibration in the circumferential direction.As shown in Figs. 14 and 15, the degree of compaction is Also in terms of water permeability, it exhibits extremely superior effects compared to conventional vibrations only in the front-rear direction or left-right direction. That is, FIGS. 14 and 15 show the degree of compaction and hydraulic conductivity measured with respect to the number of times of compaction under the following test conditions.

Machine weight 6300Kg Rolling wheel load 3150Kg Rolling wheel diameter x width 1050φ x 1450mm Vibration frequency 3100vpm Vibration force 5100Kg Vehicle speed 2Km/h Road surface condition Bituminous mixture dense 6cm As shown in Figures 14 and 15, for example When the number of compactions is 8, the compaction degree of the present invention is 101%.
On the other hand, the conventional vibration only in the longitudinal and lateral directions has a water permeability of 98%, while the water permeability coefficient of the present invention is 2.5×
10 ^-7 cm/sec, whereas the conventional one is 4×10 ^-7
cm/sec, and the vibration of the present invention shows superior results in all cases.

Next, a second embodiment will be explained based on FIG.

In this second embodiment, the configuration other than the number of rotating shafts of the eccentric mass and the manner in which the eccentric mass is attached is the same as in the first embodiment, so the same members are given the same reference numerals and a description thereof will be omitted.

In the second embodiment, the brackets 21, 21, 21 provided on both sides of the rotation center line A of the rolling wheel 4 have rotation center lines B and C on the diametrical straight line orthogonal to the rotation center line A of the rolling ring 4. In addition to the first and second rotating shafts 18a and 18b in the first embodiment having
A third rotating shaft 18c having a rotational center line X is pivotally supported via bearings 28, 28, 28. A driven spur gear 2 having the same number of teeth as the driving spur gear 23 of the first rotating shaft and the driven spur gear 24 of the second rotating shaft is provided in the middle of the third rotating shaft 18c.
9 is provided, and the driven spur gear 24 of the second rotating shaft
It is configured to mesh with the shaft and receive rotational transmission. At both outer ends of the first rotating shaft 18a, the second rotating shaft 18b, and the third rotating shaft 18c,
Eccentric masses 27a, 27b, 27c, 2, respectively
7d, 27e, and 27f are attached.

The eccentric masses 27a, 27b, 27c, 27
The mutual relationship between the eccentric positions of d and 27e and 27f is determined as follows. That is, the eccentric mass 27a at one outer end of the first rotating shaft is
When the vibration driving shaft 15 is eccentric in one axial direction, the eccentric mass 27b at the outer end on the other side is 180°+ with respect to the eccentric direction of the eccentric mass 27a at the outer end on the one side.
The eccentric mass 27d at the other outer end of the second rotating shaft is eccentric in a direction with a 30° (or 180°-30°) different positional relationship. In the same direction as the eccentric mass 27a at the outer end of the second rotating shaft, and the eccentric mass 27c at the outer end of the second rotating shaft is in the same eccentric direction as the eccentric mass 27d at the outer end of the second rotating shaft. The eccentric masses 27e and 27f at the outer ends of one side and the other side of the third rotating shaft are eccentric in a direction that has a positional relationship that is 180° + 30° (or 180° - 30°) different from that of the third rotating shaft. 1st
It is eccentric in the same direction as the eccentric direction of the eccentric masses 27a and 27b at the outer ends of one side and the other side of the rotating shaft.

In addition, the eccentric masses 27a, 27b, 27
The mutual relationship between the masses c, 27d and 27e, 27f is determined as follows. That is, the first
and eccentric masses 27a at both outer ends of the third rotating shaft,
27b, 27e, and 27f have the same mass, and the eccentric masses 27c, 27d at both outer ends of the second rotating shaft are equal to the eccentric masses 27a, 27a, and 27f at both outer ends of the first and third rotating shafts. 27b and 27e, 27
The mass is twice as large as f, that is, the relationships are 27c=27a+27e and 27d=27b+27f.

Next, the operation of the vibration mechanism according to the second embodiment will be explained.

When the compaction machine 1 is stopped running, the hydraulic motor 14 operates the output shaft, the coupling, the vibration drive shaft 15, the drive bevel gear 17, the driven bevel gear 22, the drive spur gear 23, and the driven spur gears 24, 29. When the rotating shafts 18a, 18b, and 18c are rotated as shown by the arrows, the outer peripheral end of the eccentric mass 27a rotates around the rotation center line B in the order of positions F, E, D, and G in FIG. Similarly, the outer peripheral edge is D′,
G', F', E' rotate in the order, and the outer peripheral end of the eccentric mass 27c rotates H', I', J',
The outer peripheral end of the eccentric mass 27d similarly rotates in the order of J, K, H, I, and the eccentric mass 27d rotates in the order of K'.
The outer peripheral end of e is conversely P, centering on the rotation center line
It rotates in the order of O, N, and Q, and the outer peripheral end of the eccentric mass 27f rotates in the order of N', Q', and O'.

Each eccentric mass 27a, 27b, 27c, 27d,
Since the eccentric positions of 27e and 27f have the above-mentioned relationship, when the outer peripheral end of the eccentric mass 27a is at the position F at one point during this rotation, the outer peripheral end of the eccentric mass 27e is at the position P, and the eccentric The outer peripheral end of the mass 27c takes the position H'. At this point, the outer peripheral end of the eccentric mass 27b is at position D', the outer peripheral end of eccentric mass 27f is at position N', and the outer peripheral end of eccentric mass 27d is at position J.

At this time, position B to F, position X to P, position C
The centrifugal forces directed from H' to H', from position B to D', from position
Expressed as XP, CH′, BD′, XN′ and CJ, centrifugal force
BF, XP and CH' and centrifugal force BD', XN' and CJ act in directions that cancel each other out, but the resultant vector of centrifugal force has a magnitude of (BF +
CH′cos30° and CJ− (BD′cos30°+XN′cos30°)
And the directions are B to F, X to P, and C to J.
As a result, centrifugal force acts from N toward F. Therefore, rolling wheel 4
A force α (Fig. 5) acts that causes the to vibrate to the right.

Similarly, at one point during rotation, when the outer circumference of eccentric mass 27a is at position D, the outer circumference of eccentric mass 27e is at position N, and the outer circumference of eccentric mass 27c is at position J'. At this point, the outer peripheral end of the eccentric mass 27b is at position F', and the outer peripheral end of the eccentric mass 27f is at position P', and the eccentric mass 27b is at position F'.
The outer peripheral end of 7d takes the position H.

At this time, position B to D, position X to N, position C
from J', from position B to F', from position X to P' and from position C
The centrifugal forces directed from H to BD, XN,
Expressed by CJ′, BF′, XP′ and CH, centrifugal force BD,
XN and CJ' and centrifugal forces BF', 'cos 30° + Therefore, a force β (FIG. 5) acts that causes the rolling wheel 4 to vibrate to the left.

Furthermore, when the outer circumferential end of the eccentric mass 27a is at position E at one point during rotation, the outer circumferential end of the eccentric mass 27b is at position G'. At this point, the eccentric mass 2
The outer peripheral end of 7c is at position I', the outer peripheral end of eccentric mass 27d is at position K, and the outer peripheral end of eccentric mass 27e is at position K.
The outer peripheral end of is at position O, and the outer peripheral end of eccentric mass 27f is at position Q'. At this time, as shown in FIG. 7, a force that rotates in the L direction (circumferential direction) acts synergistically on the rolling wheel 4. Therefore, a force θ (FIG. 5) in the longitudinal direction is applied to the ground contact portion of the rolling wheel 4 in parallel with the ground.

Similarly, at one point during rotation, when the outer circumferential end of eccentric mass 27a is at position G, the outer circumferential end of eccentric mass 27b is at position E'. At this point, the eccentric mass 2
The outer peripheral end of 7c is at position K', and the eccentric mass 27d
The outer peripheral end of takes the position I, and the eccentric mass 27
The outer peripheral end of e is at position Q, and the outer peripheral end of eccentric mass 27f is at position O'. At this time, contrary to the above,
Forces that rotate in the M direction (circumferential direction) in FIG. 4 act synergistically on the rolling wheel 4. This force is γ (Fig. 5)
Expressed as

In this way, the eccentric masses 27a, 27b, 27
When the wheels c, 27d, 27e, and 27f rotate, centrifugal force vectors α~θ~β~γ~α that change momentarily act on the grounding part of the rolling wheel 4, and this grounding part is As shown by arrow W, it vibrates on an elliptical circumference on a horizontal plane. Therefore, this embodiment operates in the same manner as the first embodiment and provides similar effects.

In this way, the second embodiment has eccentric masses 27a, 27b and 27 at the outer ends of the first and third rotating shafts.
e and 27f have the same mass, and eccentric masses 27c and 27d at the outer end of the second rotating shaft
is the eccentric mass 2 of the outer ends of the first and third rotating shafts
The mass is 2 for 7a, 27b and 27e, 27f.
The mass conditions are set so that the relationship is doubled.
And eccentric masses 27a, 27b, 27c, 27
The rotation of d, 27e, and 27f generates an excitation force to vibrate the rolling wheel 4 in the left-right direction within a horizontal plane.

By the way, the excitation force F is F=mrω ² (where m is the total mass of the object, r is the eccentric distance, and m・
Since r is the eccentric moment and ω is the rotational angular velocity, setting the mass condition as above naturally applies even when the proportional eccentricity distance, that is, the radius of rotation r around the axis, is changed. The same conditions can be set for both. That is, if the rotational angular velocity ω is constant, the eccentric masses at the outer ends of the first, second, and third rotating shafts are the same, and the eccentric masses 27c and 27c at the outer ends of the second rotating shaft are equal. The eccentric mass 2 of the outer ends of the first and third rotating shafts is
2 of the eccentric distance of 7a, 27b and 27e, 27f
It is obvious that even if the relationship is doubled, the same excitation force can be obtained. Therefore, depending on the vibration mechanism of the compaction machine in the second embodiment, even if the eccentric distance is changed instead of changing the mass size of the eccentric mass, and in some cases, the rotation Varying the length of the shaft produces the same effect.

Therefore, the term "eccentric mass" as used herein includes the meaning of "eccentric distance" which is in a proportional relationship, and shall mean "eccentric moment".

Next, a third embodiment will be explained based on FIG.

The third embodiment differs from the first embodiment in that the rotation center lines B and C on a straight line perpendicular to the rotation center line A of the rolling wheel 4 are arranged at a plurality of positions on the rotation center line A of the rolling wheel 4.
The first rotating shaft and the second rotating shaft are pivotally supported in the diametrical direction so as to be located on a straight line in a direction including a straight line perpendicular to the rotational center line A of the rolling wheel 4. The difference is that a first rotation shaft and a second rotation shaft are provided to face each other in the radial direction. Since this embodiment is the same as the first embodiment except for the way in which the eccentric mass is attached, the same members are given the same reference numerals and their explanations will be omitted.

Brackets 21a, 21a, 21 provided on the inner surface of the side plate 10 sandwiching the rotation center line A of the rolling wheel 4.
a, 21a have rotation center lines B and C on a straight line orthogonal to the rotation center line A of the rolling wheel 4 at a plurality of positions on the rotation center line A of the rolling wheel 4, and
First rotating shafts 18c, 18d and second rotating shafts 18e, radially opposed to each other so as to be located on a straight line whose component is a straight line perpendicular to the rotational center line A of the rolling wheel 4. 18f, bearing 19
a, 19a, 19a, 19a and 20a, 20
It is pivotally supported via a, 20a, 20a. Driven bevel gears 22a and 22b are provided at the inner ends of the first rotating shafts 18c and 18d, respectively, and mesh with the drive bevel gear 17 provided at the tip of the drive shaft 15.

The drive spur gears 23a, 23b provided halfway between the first rotating shafts 18c, 18d are connected to the driven spur gears 24a, 24b provided halfway between the second rotating shafts 18e, 18f, respectively. mesh. Drive spur gears 23a, 23b and driven spur gear 24a,
24b each have the same number of teeth.
Eccentric masses 30a, 30b and 30 of equal mass are provided at both outer ends of the first rotational shafts 18c, 18d and the second rotational shafts 18e, 18f, respectively.
c, 30d are attached.

The eccentric masses 30a, 30b and 30c, 30
The mutual relationship of each eccentric position of d is determined as follows. That is, when the eccentric mass 30a at the outer end on one side of the first rotating shaft is eccentric in the other axial direction of the vibration driving shaft 15, the eccentric mass 30b at the outer end on the other side is also eccentric in the same direction. At this time, the eccentric masses 30c, 30d at the outer ends on one side and the other side of the second rotating shaft are the eccentric masses 30a, 30d at the outer ends on one side and the other side of the first rotating shaft. 3
180° + 30° (or 180° -
30°) is eccentric in the direction that results in a different positional relationship.

Next, the operation of the vibration mechanism according to the third embodiment will be explained.

With the compaction machine 1 stopped running, the hydraulic motor 14 operates the output shaft, the coupling, the vibration drive shaft 15, the drive bevel gear 17, and the driven bevel gears 22a, 22.
b, driving spur gears 23a, 23b, driven spur gear 24
Rotating shafts 18c, 18d, 18 via a, 24b
When e and 18f are rotated as indicated by the arrows, the outer peripheral end of the eccentric mass 30a rotates around the rotation center line B in the order of positions D, E, F, and G in FIG. 9, and the outer peripheral end of the eccentric mass 30b rotates in the opposite direction. It rotates to positions D, G, F, and E in this order. Further, the outer peripheral end of the eccentric mass 30c rotates around the rotation center line C in the order of positions J', I', H', and K', and the outer peripheral end of the eccentric mass 30d rotates in the order of positions J', I', H', and K'.
Rotate in the order of K′, H′, and I′.

Since the eccentric positions of each eccentric mass 30a, 30b, 30c, and 30d have the above-mentioned relationship, when the outer peripheral end of the eccentric mass 30a is at position D at one point during this rotation, the outer peripheral end of the eccentric mass 30b is also Take position D. At this point, the outer peripheral end of the eccentric mass 30c is at position J', and the outer peripheral end of the eccentric mass 30d is also at position J'.

At this time, if the centrifugal forces from position B to D and from position C to J' are expressed as BD and CJ', then B
The centrifugal force from C towards D and the centrifugal force from C towards J' act in directions that cancel each other out, but the resultant vector of centrifugal forces has a magnitude of BD-
When CJ'cos is 30 degrees, the direction is from F to H, and therefore, a force β (FIG. 8) acts that causes the rolling wheel 4 to vibrate to the left.

Similarly, when the outer circumferential end of eccentric mass 30a is at position F at one point during rotation, the outer circumferential end of eccentric mass 30b also assumes position F. At this point, the outer peripheral end of the eccentric mass 30c is at position H', and
The outer peripheral end of the eccentric mass 30d also takes the position H'.

At this time, the centrifugal forces from position B to F and from position C to H' are expressed as BF and CH', respectively.
The centrifugal force from B to F and the centrifugal force from C to H' act in directions that cancel each other out, but the resultant vector of centrifugal forces has a magnitude of BD-
When CJ'cos is 30 degrees, the direction is from F to H, and therefore, a force α (FIG. 8) acts that causes the rolling wheel 4 to vibrate to the right.

Further, when the outer circumferential end of the eccentric mass 30a is at position E at one point during rotation, the outer circumferential end of the eccentric mass 30b is at position G. At this point, the outer peripheral end of the eccentric mass 30c is at position I', and the outer peripheral end of the eccentric mass 30d is also at position K'. At this time,
As shown in FIG. 10, forces that rotate in the L direction (circumferential direction) act on the rolling wheel 4 almost synergistically. Therefore, a force θ (FIG. 8) in the longitudinal direction is applied to the ground contact portion of the rolling wheel 4 in parallel with the ground.

Similarly, when the outer circumferential end of eccentric mass 30a is at position G at one point during rotation, the outer circumferential end of eccentric mass 30b is also at position E. At this point, the outer peripheral end of the eccentric mass 30c is at position K', and
The outer peripheral end of the eccentric mass 30d also takes the position I'. At this time, in contrast to the above, forces that rotate the rolling wheel 4 in the M direction (circumferential direction) in FIG. 10 act almost synergistically. This force is represented by γ (Figure 8).

In this way, the eccentric masses 30a, 30b, 30
When c and 30d rotate, the centrifugal force vector α ~ θ ~ that changes moment by moment with respect to the ground contact part of the rolling wheel 4
β to γ to α act, and this grounding portion vibrates on an elliptical circumference on a horizontal plane, as shown by arrow W in FIG.

Therefore, this embodiment operates in the same manner as the first and second embodiments, and provides similar effects.

Next, a fourth embodiment will be explained based on FIG. 11. This fourth embodiment is the same as the second embodiment, except that the first, second, and third rotating shafts are supported radially opposite each other, and the manner in which the eccentric mass is attached is different. Therefore, the same members are given the same reference numerals and the description thereof will be omitted.

Brackets 21a, 21a, which are provided on the inner surfaces of the side plates 10, 11 across the rotational center line A of the rolling wheel 4,
21a, 21a, at a plurality of positions on the rotational center line A of the rolling wheel 4, and having rotational center lines B and CX on a straight line orthogonal to the rotational center line A of the rolling wheel 4, facing each other in the radial direction. Each rotating shaft 18c, 1
In addition to the third rotating shafts 8d and the second rotating shafts 18e and 18f, the third rotating shafts 18g and 18h are supported via bearings 31, 31, 31, and 31, respectively. Driven bevel gears 22a and 22b are provided at the inner ends of the first rotating shafts 18c and 18d, respectively, and mesh with the drive bevel gear 17 provided at the tip of the drive shaft 15.

The driving spur gears 23a, 23b provided at the intermediate portions of the first rotational shafts 18c, 18d are connected to the intermediate portions of the second rotational shafts 18e, 18f and the third rotational shafts 18g, 18h. The driven spur gears 24a, 24b and 32a, 32b are respectively meshed with each other. The driving spur gears 23a, 23b, the driven spur gears 24a, 24b, and the same 32a, 32b are as follows.
Each has the same number of teeth. Each of the first rotating shafts 18c, 18d and each of the second rotating shafts 18
At both outer ends of each of the third rotation shafts 18g and 18h, an eccentric mass 3 having the same mass is attached.
3a, 33b, 33c, 33d and 33e,
33f is installed.

The eccentric masses 33a, 33b, 33c, 33
The mutual relationship between the offset positions of d and 33e and 33f is determined as follows. That is, the eccentric mass 33a at one outer end of the first rotating shaft is
When the vibration generating drive shaft 15 is eccentric in the other axial direction, the eccentric mass 33b at the outer end on the other side is also eccentric in the same direction, and at this time, the eccentric mass 33b at the outer end on the other side is eccentric in the same direction. Eccentric mass 33c, 33d at the opposite end
is relative to the eccentric direction of the eccentric masses 33a and 33b at the outer ends of one side and the other side of the first rotating shaft.
The eccentric masses 33g, 33 are eccentric in directions with a positional relationship that is different by 180° + 30° (or 180° - 30°), and at the outer ends of one side and the other side of the third rotating shaft.
f is eccentric in the same direction as the eccentric direction of the eccentric masses 33a and 33b at the outer ends on one side and the other side of the first rotating shaft.

In addition, the eccentric masses 33a, 33b,
The mutual relationship between the masses c, 33d and masses 33e, 33f is determined as follows. That is, the first
and eccentric masses 33a at both outer ends of the third rotating shaft,
33b, 33e, and 33f have the same mass, and the eccentric masses 33c, 33d at both outer ends of the second rotating shaft are equal to the eccentric masses 33a, 33a, and 33f at both outer ends of the first and third rotating shafts. 33b and 33e, 33
The mass is twice as large as f, that is, 33c=33a+
The relationship is 33e and 33d=33b+33f.

Next, the operation of the vibration mechanism according to the fourth embodiment will be explained.

With the compaction machine 1 stopped running, the hydraulic motor 14 operates the output shaft, the coupling, the vibration drive shaft 15, the drive bevel gear 17, and the driven bevel gears 22a, 22.
b, driving spur gears 23a, 23b, driven spur gear 24
The rotating shaft 18 via a, 24b, 32a, 32b
c, 18d and 18e, 18f and 18g, 18
When h is rotated as shown by the arrow, the outer peripheral end of the eccentric mass 33a rotates around the rotation center line B in the order of positions D, E, F, and G in FIG. 12, and the outer peripheral end of the eccentric mass 33b similarly rotates to the position The outer peripheral end of the eccentric mass 33c rotates in the order of positions J', I', H', K' around the rotation center line C, and the outer peripheral end of the eccentric mass 33d rotates in the order of D, G, F, and E. The ends are J′, K′, H′,
The outer peripheral end of the eccentric mass 33e rotates in the order of N, O, P, Q around the rotation center line X,
The outer peripheral end of the eccentric mass 33f rotates in the order of N, Q, P, and O.

Each eccentric mass 33a, 33b, 33c, 33d,
Since the eccentric positions of 33e and 33f have the above-mentioned relationship, when the outer peripheral end of eccentric mass 33a is at position D at one point during this rotation, the outer peripheral end of eccentric mass 33b also assumes position D. At this point, the outer peripheral end of the eccentric mass 33c is at position J', the outer peripheral end of eccentric mass 33d is also at position J', and the outer peripheral end of eccentric mass 33e is at position N, and the eccentric mass 33d is at position J'. 3
The outer peripheral end of 3f also takes the N position.

At this time, the centrifugal forces directed from position B to D, from position X to N, and from position C to J' are BD, XN, respectively.
and CJ′, centrifugal force BD and XN and centrifugal force
CJ′ acts in a direction that cancels each other out, but
The resultant vector of centrifugal force has a magnitude of (BD+
XN)-CJ'cos 30 degrees, the direction is from F to N, and therefore a force β (FIG. 11) acts that causes the rolling wheel 4 to vibrate to the left.

Similarly, when the outer circumferential end of eccentric mass 33a is at position F at one point during rotation, the outer circumferential end of eccentric mass 33b also assumes position F. At this point, the outer peripheral end of the eccentric mass 33c is at position H', the outer peripheral end of the eccentric mass 33d is also at position H', and the outer peripheral end of eccentric mass 33e is at position P. The outer peripheral end of 33f also takes the position P.

At this time, the centrifugal forces from position B to F, from position X to P, and from position C to H' are BF,
Expressed by XP and CH', centrifugal force BF, XP, and centrifugal force CH' act in directions that cancel each other out, but the resultant vector of centrifugal force has a magnitude of (BF + XP) - CH'cos30 °, the direction is from N to F
Therefore, a force α (FIG. 11) is applied that vibrates the rolling wheel 4 to the right.

Further, when the outer circumferential end of the eccentric mass 33a is at position E at one point during rotation, the outer circumferential end of the eccentric mass 33b is at position G. At this point, the eccentric mass 33
The outer peripheral end of c is at position I', the outer peripheral end of eccentric mass 33d is at position K', and the outer peripheral end of eccentric mass 33e is at position K'.
The outer peripheral end of is at position O, and the outer peripheral end of eccentric mass 33f is at position Q. At this time, as shown in FIG. 13, forces that rotate in the L direction (circumferential direction) act on the rolling wheel 4 almost synergistically. Therefore, a force θ (11th
Figure) is in effect.

Similarly, when the outer circumferential end of eccentric mass 33a is at position G at one point during rotation, the outer circumferential end of eccentric mass 33b is at position E. At this point, the eccentric mass 3
The outer peripheral end of 3c is at position K', and the eccentric mass 33d
The outer peripheral end of takes the position I', and the eccentric mass 33
The outer peripheral end of e is at position Q, and the outer peripheral end of eccentric mass 33f is at position O. At this time, contrary to the above,
Forces that rotate in the M direction (circumferential direction) in FIG. 13 act synergistically on the rolling wheel 4. Let this force be γ (11th
Figure).

In this way, the eccentric masses 33a, 33b, 33
When the wheels c, 33d, 33e, and 33f rotate, a centrifugal force vector α~θ~β~γ~α that changes from time to time acts on the ground contact part of the rolling wheel 4, and this ground contact part As shown by arrow W, it vibrates on an elliptical circumference on a horizontal plane.

Therefore, this embodiment operates in the same manner as the first, second, and third embodiments, and provides similar effects.

Note that in this fourth embodiment, as in the case of the second embodiment, the rotational angular velocity ω is constant,
The eccentric masses at the outer ends of the first, second, and third rotating shafts are the same, and the eccentric distances between the eccentric masses 33c and 33d at the outer ends of the second rotating shafts are the same as those at the outer ends of the first, second, and third rotating shafts. If the eccentric mass 33a, 33b and 33e, 33f at the outer end of each third rotating shaft are set so that the eccentric distance is twice as large, the same excitation force can be obtained. can be read as "eccentric moment".

In addition, the meaning of advancing or retarding the phase of the eccentric mounting position of the eccentric mass within 45 degrees is that within 45 degrees, the elliptical circumferential shape and circulation are better compared to vibrations only in the front and rear directions. This means that it is possible to make vibrations like this.

〔Effect of the invention〕

As explained above, the present invention uses an elliptical circumferential or circular vibration that has a small vibration force in the left-right direction and a large vibration force in the front-rear direction with respect to the direction of movement in a horizontal plane in a compaction machine. Since the rolling compaction is carried out by rolling, it is possible to prevent the occurrence of vibration pollution as much as possible, and a good kneading effect works, resulting in excellent water permeability, airtightness, etc., and the vibration force in the left and right direction is small. Vibration is well absorbed by the suspension rubber, and transmission of vibration force to the frame body is extremely reduced, reducing operator fatigue.

[Brief explanation of drawings]

Fig. 1 is a side view of the compaction machine, Fig. 2 is a sectional view of a rolling wheel showing the first embodiment of the present invention, Fig. 3 is an explanatory view taken in the direction of the arrows in Fig. 2, and Fig. 4 is Fig. 2 FIG. 5 is a sectional view of a rolling wheel showing the second embodiment of the present invention, FIG. 6 is an explanatory view as viewed from the arrow in FIG.
The figure is an explanatory view taken in the direction of the arrow in FIG. 5, FIG. 8 is a sectional view of a rolling wheel showing the third embodiment of the present invention, FIG. 9 is an explanatory view taken in the direction of the arrow in FIG. 8, and FIG. 11 is a cross-sectional view of a rolling wheel showing the fourth embodiment of the present invention, FIG. 12 is an explanatory view taken from arrow XII in FIG. 11,
Fig. 13 is a diagram illustrating the arrow direction of Fig. 11, Fig. 14 is a line diagram showing the relationship between the degree of compaction and the number of times of compaction according to the present invention, and Fig. 15 is a diagram showing the relationship between the hydraulic conductivity and the number of times of compaction. FIG. 1...Compaction machine, 4...Rolling wheel, 5...Frame, 9...Mounting body, 10, 11...Side plate, 12
... Boss shaft, 13 ... Bearing, 14 ... Hydraulic motor, 15 ... Vibration drive shaft, 17 ... Drive bevel gear, 1
8a, 18b, 18c, 18d, 18e, 18
f, 18g, 18h... Rotating shaft, 19, 19a,
20a... Bearing, 22, 22a, 22b...
... Driven bevel gear, 23, 23a, 23b... Drive bevel gear, 24, 24a, 24b... Driven spur gear, 2
5a, 25b, 25c, 25d... Eccentric mass, 2
7a, 27b, 27c, 27d, 27e, 27f
...Eccentric mass, 30a, 30b, 30c, 30d
...Eccentric mass, 33a, 33b, 33c, 33
d, 33e, 33f... Eccentric mass.

Claims (1)

[Scope of Claims] 1. By rotating a rotating shaft having a rotational center line on a straight line substantially orthogonal to the rotational center line of the rolling wheel and having an eccentric mass at each outer end, the rolling wheel can be rotated. In a vibration mechanism of a compaction machine that vibrates a ground-contacting part in a substantially horizontal plane, at a plurality of positions substantially on the rotation center line of the rolling wheel, on a straight line in a direction whose component is a straight line substantially perpendicular to the rotation center line of the rolling wheel. A plurality of rotating shafts, each having an eccentric mass at its outer end, are mounted such that the eccentric mass on one side of a particular rotating shaft among the plurality of rotating shafts is located at a certain point in time during the rotation of each rotating shaft. When the rolling wheel is eccentric in one direction in the axial direction of the center line of rotation, a part of the eccentric mass on the other side of the specific rotating shaft or the eccentric mass on one side or the other side of the other rotating shaft is eccentric in the same direction as the eccentric direction of the eccentric mass on one side of the shaft, and the eccentric direction of the other parts differs within a range of 180° ± 45° from the eccentric direction of the eccentric mass on one side of the specific rotating shaft. The vibration mechanism of a compaction machine is characterized by