JPH02272104A - Vibrating roller - Google Patents

Abstract

PURPOSE:To inhibit the generation of vibrations and noises, and to reduce the consumption of energy by mutually turning vibrating shafts in the opposite direction and bringing eccentric mass to the same phase of the vertical direction so that eccentric moment may differ in the vibrating shafts. CONSTITUTION:A vibrator 1 is supported to the side plate 8 of a vibrating roller, and rolling wheels 9, 10 are supported pivotally to the side plate 8. The revolution of an engine 13 is transmitted to the pulley 22 of a drive mechanism 6, and vibrating shafts 2, 3 are rotated mutually in the opposite direction at the same angular velocity. The eccentric moment of the eccentric messes 4, 5 of one of the vibrating shafts 2, 3 of the vibrating roller is changed, and the eccentric moment is brought to the same phase in the vertical direction. Accordingly, energy is used effectively as compaction force, and the generation of vibrations and noises can be prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a vibrating roller, in which a vibrating device is suspended from a road roller, etc., and in particular, it generates an effective compaction force in the downward direction, and The present invention relates to a vibrating roller in which centrifugal force in a direction can be effectively used for compacting a road surface.

(Prior Art) Most vibrating rollers are composed of a road roller or the like with a vibrating device attached.

The vibration generator has a structure in which a vibration shaft equipped with an eccentric mass is rotated at high speed, and the centrifugal force generated by this rotates the rolling wheels to vibrate, thereby performing compaction.

Conventionally, single-shaft and two-shaft vibration exciters have been commonly used.

5 and 6 show a uniaxial type (FIG. 5) and a biaxial type (FIG. 6) of a hand-guided vibrating roller having an operating handle 25. FIG.

In FIG. 5, the vibration excitation device consists of a single vibration excitation shaft 26 with an eccentric mass 27 fixed to it, and front and rear rolling wheels 9, 10.
is placed at the center of the The vibration shaft 26 is rotated at high speed by a drive mechanism (not shown).

When the vibration shaft 26 rotates at a constant angular velocity, centrifugal force is generated due to the weight and eccentricity of the eccentric mass 27. This centrifugal force acts with the same force in all directions as shown by the arrow. In other words, it acts not only in the vertical direction but also in the longitudinal direction.

In FIG. 6, the excitation device includes a pair of excitation shafts 28.
29, and the eccentric mass 30° 31 due to the same eccentric moment I (weight multiplied by the amount of eccentricity).
0.3] is fixed so that it is in the open phase when facing in the vertical direction, and is disposed at the center position of the front and rear rolling wheels 9 and 10.

The vibration shafts 30 and 31 are configured to rotate in the same direction in opposite directions by a drive mechanism (not shown).

In this case, twice as much centrifugal force acts in the vertical direction as in the case of the −-axis vibration axis, but the centrifugal forces in the longitudinal direction cancel each other out and become zero.

[Problem to be solved by the invention]

In the case of the uniaxial vibrating roller shown in Fig. 5, the centrifugal force in the vertical direction effectively acts on compacting the road surface, but the centrifugal force in the longitudinal direction in particular becomes too large for the purpose of the vibration. The entire roller vibrates and is transmitted to the worker, causing fatigue.
A problem arises in that noise is generated. If the eccentric moment I of the eccentric mass 27 is reduced in order to solve the above problem, the downward centrifugal force will also be reduced, resulting in the problem of insufficient compaction force. On the other hand, a two-shaft type (not shown in Figure 6) can obtain a large compaction force in the vertical direction, and also cancels the centrifugal force in the front-back direction, thereby avoiding the generation of vibrations and noise. Since the centrifugal force of the road surface is canceled, a problem arises in that energy is not effectively consumed for compacting the road surface.

In other words, energy is wasted.

The present invention solves the above problems, and aims to provide a vibrating roller that generates sufficient centrifugal force to compact the road surface, generates less vibration and noise, and wastes less energy. do.

[Means for Solving the Problem] To this end, the present invention provides a vibrating roller that compacts a road surface, etc. by rotating a vibrating shaft to which an eccentric mass is attached, and applying vibration to a rolling wheel by the centrifugal force of the vibrating shaft. , the excitation shafts are arranged in parallel so as to rotate in opposite directions, and the eccentric mass and/or the amount of eccentricity is adjusted so that the eccentric moments of the excitation shafts are different, so that the eccentric mass rotates in the vertical direction. The vibrating rollers are mounted in substantially the same phase when facing each other. Specifically, first, when the drive wheels of the vibrating rollers are all-wheel drive, the centrifugal force F in the longitudinal direction generated by the eccentric mass is applied to the road surface, etc. The coefficient of friction between the wheel and both wheels of the rolling wheel is μ0. The vibration roller is approximately F≦μ+Q1 10μ2Q2 in relation to the load QQ2 applied to both wheels of the rolling wheels when μ2 is set, and one of the rolling wheels of the vibrating roller is driven while the other is driven. When is a driven wheel, the centrifugal force F in the longitudinal direction generated by the eccentric mass is the load applied to the driving wheel, where μ is the friction coefficient between the road surface, etc. and the driving wheel, and μo is the rolling resistance coefficient of the driven wheel. Also, the load on the driven wheel is Q
In relation to o, approximately F≦μaQ3+μ. This constitutes the vibrating roller in Qa.

[Operation] By changing the eccentricity of the eccentric mass, the centrifugal force in the longitudinal direction is not completely canceled but becomes a certain value. Set this value to a constant value (if the vibrating roller is an all-wheel drive type, μ
lQ+ +μIQ2, if one of the rolling wheels of the vibrating roller is a driven wheel, μ@Q80μ. By setting the value to be less than or equal to Qo), the centrifugal force in the longitudinal direction will function for compacting the road surface. When the centrifugal force in the longitudinal direction exceeds the above certain value, slippage occurs between the rolling wheels and the road surface, causing vibration and
Noise will be generated.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Fig. 1 shows the overall structure of a hand-guided vibrating roller, Fig. 2 is a side view of Fig. 1, and Fig. 3 shows the detailed structure of the vibrating device taken along the line ■-■ in Fig. 1. FIG.

In FIG. 1, an excitation device 1 includes a pair of excitation shafts 2 and 3 arranged in parallel, an eccentric mass 4 fixed to the excitation shaft 2, an eccentric mass 5 fixed to the excitation shaft 3, and a third Excitation axis 2 as shown in the figure
, 3, a cylindrical vibration case 7 enclosing the vibration shafts 2 and 3, and the like. This vibration generating device 1 is supported by a side plate 8 of a vibrating roller. As shown in FIG. 2, front and rear rolling wheels 9 and 10 are pivotally supported on the side plate 8. Further, the side plate 8 is fixed to a vehicle body frame 11, which is a fixed side, via a vibration isolating rubber 12. As shown in FIGS. 1 and 2, an engine 13 and a hydraulic pump 1 are mounted on the vehicle body frame 11.
A support stand 15 that supports 4 is placed. Note that, as shown in FIG. 1, a water tank 16 and an oil tank 17 are also mounted on the vehicle body frame 11. Also engine 13
An engine fuel tank 18 is attached above.

The rotation of the engine 13 is transmitted to a hydraulic pump (rotary pump) 14 via a coupling 19 to rotate a pulley 20. The pulley 20 is connected to the drive mechanism 6 via a belt 21.
The rotation is transmitted to the pulley 22 of.

The drive mechanism 6 includes a pulley 22 fixed to the vibration shaft 3 which is pivotally supported by the side plate 8, a gear 23 which is fixed to the vibration shaft 3, and a gear 23 which is meshed with the vibration shaft 2 which is pivotally supported by the side plate 8. It is composed of fixed gears 24 having the same number of teeth. With the above configuration, when the pulley 22 rotates, the vibration shafts 2 and 3 rotate in opposite directions at the same angular velocity ω.

The vibration roller of the present invention changes the eccentric mass 4 or 5 on one side of the vibration shaft 2.3 by changing the eccentric moment.
5 is installed so that it is in the open phase when facing downward. (In the embodiment, the eccentric moment of the eccentric mass 4 [weight W, eccentric amount R] WR> the eccentric moment of the eccentric mass 5 [weight W, eccentric amount r] wr.) Note that the rolling wheels 9 and 10 are equipped with hydraulic motors. 35, a gear 36 fitted to the output shaft of the hydraulic motor 35, and a gear mechanism (gears 3737', 38, 38') connected thereto.
Rotation is transmitted through the shaft and the shaft is rotated. Further, the attitude of the vibrating roller is maintained and the speed is controlled by an operating handle 25 (shown in FIGS. 5 and 6).

Next, the operation of the vibration generating device 1 will be explained in more detail with reference to FIG.

The eccentric mass 4 fixed to the vibration generating shaft 2 has a weight W and the center of gravity at the eccentricity R, and the eccentric mass 5 fixed to the vibration generating shaft 3 has the weight W and the center of gravity at the eccentricity r. have. And W and W and R and r have a relationship of W>w and R>r. That is, the eccentric moment is WR>wr. Therefore, the maximum centrifugal force acting in the vertical direction is (WR ± wr) ω2 when the eccentric mass is oriented vertically, and the maximum centrifugal force acting in the longitudinal direction (Fl) is when the eccentric mass is oriented horizontally (
WR−wr)ω2. Furthermore, as shown in Fig. 4, at a position rotated by an angle θ, the centrifugal force in the vertical direction is (W Rc
osθ+wrcosθ)ω2, and the centrifugal force acting in the front-rear direction becomes (WRsinθ−wrsinθ)ω2.

By setting the weights W, w and the eccentricities R, r to appropriate values, the value of F can be made equal to or smaller than the value of μ+Q+10μ2Q2. Here, μm and μ2 are coefficients of friction between the road surface and the rolling wheels, and Qa and Qa represent the loads respectively applied to one of the rolling wheels of the vibrating roller.

If the force acting in the longitudinal direction exceeds μ+Q+10 μ2Q2, slippage will occur between the rolling wheels 9.10 and the road surface, resulting in wasted energy.

On the other hand, a longitudinal force slightly equal to or less than μ+Q+ 10μ2Q2 acts as an effective force for compacting the road surface. Therefore, the value of Fl − (WRwr)ω2 mentioned above is μ,
By setting Qt to 10μ2Q2 or less, it becomes possible to make the centrifugal force generated in the longitudinal direction act as a force for compacting the road surface. In other words, energy can be effectively used as compaction force, unlike the conventional biaxial vibrating roller, which cancels the force in the longitudinal direction and wastes energy. Furthermore, unlike the -shaft type, there is no action of a large force in the longitudinal direction, so vibration and noise are prevented from occurring. Therefore, the handle does not shake, making it easy to operate and work comfortably.

On the other hand, since the centrifugal force in the vertical direction has a value of <WR+wr)ω2, a sufficient rolling effect can be exerted.

Next, a second embodiment of the present invention will be described. In the second embodiment, only the right wheel 10 of the first embodiment becomes a driven wheel,
The rest of the structure is exactly the same as the drawing of the first embodiment, so the drawing is omitted and only the operation will be explained based on FIG. 4.

The eccentric mass 4 fixed to the vibration generating shaft 2 has a weight W and has a center of gravity at the eccentricity MRO, and the eccentric mass 5 fixed to the vibration generating shaft 3 has a weight W and has a center of gravity at the eccentricity r. are doing. And W and W and R and r have a relationship of W>w and R>r. That is, the eccentric moment is WR>wr. Therefore, the maximum centrifugal force acting in the vertical direction is (WR-1-wr)ω2 when the eccentric mass is oriented vertically, and the maximum centrifugal force acting in the longitudinal direction (Fl) is when the eccentric mass is oriented horizontally ( WR−wr)ω2. Furthermore, as shown in Figure 4, at a position rotated by an angle θ, the centrifugal force in the vertical direction is (W R
cos θ+wr cos θ)ω2, and the centrifugal force moving in the front-back direction becomes N R51nθ−wrsinO)ω2. Then, by setting the weights W, w and eccentricity Rr to appropriate values, the value of F is set to μsQa+μoQo
can be less than or equal to the value of . Here, I3 is the coefficient of friction between the road surface etc. and the rolling wheels, and is μ. is the rolling resistance coefficient of the driven wheel, Qa is the load applied to one of the driving wheels of the vibrating roller, and Q
a represents the load applied to the other driven wheel. When the force acting in the longitudinal direction exceeds μ+i Qa + II o Qo, slip occurs between the rolling wheels 9 and 10 (where 10 is the driven wheel) and the road surface, resulting in wasted energy.

On the other hand, paQa 10μ. A longitudinal force equal to or less than the Q0 force acts as an effective force for compacting the road surface.

Therefore, the value of F, -(WF(-wr)ω2) mentioned above is pa
Qm tenμ. By setting Q0 or less, it becomes possible to cause the centrifugal force generated in the longitudinal direction to act as a force for compacting the road surface.

In the above embodiment 1.2, the vibration generating shaft 2 has a larger weight and larger eccentricity than the vibration generating shaft 3 as the eccentric mass, but the invention is not limited to this. It is sufficient that there is a difference in the eccentric moment between the vibration axes 23. For example, an eccentric mass having a smaller weight and a larger eccentricity than the vibration shaft 3 may be attached to the vibration shaft 2.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, sufficient compaction force is generated for the road surface, etc., and there is no generation of vibration or noise, and less energy is wasted. It is possible to increase the effect.

[Brief explanation of drawings]

FIG. 1 is a front view showing the overall structure of an embodiment of the present invention, and FIG.
The figure is a side view of Fig. 1, Fig. 3 is a sectional view taken along the line ■-■ of Fig. 1, Fig. 4 is an explanatory diagram explaining the operation of the embodiment, and Figs. 5 and 6 are conventional uniaxial type. FIG. 2 is a front view showing an overall outline of a biaxial vibrating roller + F'i construction. 1... Vibration device, 4.5... Eccentric mass 7... Case, 9, JO... Rolling wheel, 12... Vibration isolator, I4... Hydraulic pump, 23.24. ··gear. 2.3... Vibration shaft, 6... Drive mechanism, 8... Side plate, 11... Vehicle body II-m, 13... Engine, 22... Pulley, Figure 3, Figure 4 figure

Claims (3)

[Claims] (1) In a vibrating roller that compacts a road surface by rotating a vibrating shaft to which an eccentric mass is attached and applying vibration to a rolling wheel using the centrifugal force, the vibrating shafts are rotated in opposite directions. are arranged in parallel to each other, and the eccentric masses and/or eccentric amounts are adjusted so that the eccentric moments are different on the vibration axis, and the eccentric masses are installed in substantially the same phase when the eccentric masses are oriented in the vertical direction. vibrating roller. (2) When the drive wheels of the vibrating roller are all-wheel drive, the centrifugal force F in the longitudinal direction generated by the eccentric mass is applied to the rolling wheels when the friction coefficients between the road surface, etc. and both wheels of the rolling wheels are μ_1 and μ_2. The vibrating roller according to claim 1, in which approximately F≦μ_1Q_1+μ_2Q_2 is satisfied in relation to the loads Q_1 and Q_2 applied to both wheels, respectively. (3) When one of the rolling wheels of the vibrating roller is driven and the other is driven, the centrifugal force F in the longitudinal direction generated by the eccentric mass changes the friction coefficient between the road surface etc. and the driving wheel μ_a and the rolling of the driven wheel. When the resistance coefficient is μ_o, the load applied to the driving wheel is Q_a, and the load applied to the driven wheel is Q_o, approximately F≦μ_aQ_a+μ_
The vibrating roller according to claim 1 in oQ_o.