JPH0571402B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a vehicle for traveling on rough terrain used in agriculture, forestry, mining, on snow, at civil engineering work sites, etc. is swingably supported by the body, and particularly relates to a swing support structure for the traveling means.

(Prior Art) A conventional all-terrain vehicle in which such a traveling means is swingably supported on the body is disclosed in Japanese Patent Application No. 61-195273 by the present applicant. This conventional rough terrain vehicle is
A support frame of the traveling means is swingably connected to the body via a support shaft.

(Problem to be Solved by the Invention) However, in this conventional all-terrain vehicle, the drive shaft of the hydraulic motor is connected to a support shaft of the same thickness (the support frame is attached to the body so as to be able to swing freely). Since it cannot be installed in the same place as the main shaft (to which it is connected), its drive shaft is located below its support shaft. For this reason, the lowest part of the hydraulic motor is likely to hit a road surface protrusion and be damaged, and since the support shaft is also thin, it may not be able to withstand the large torsional load applied to the support frame during steering and may break. Furthermore, since the axes of the support shaft and the hydraulic motor are separated from each other, the space required increases and the vehicle body becomes larger.

In addition, as shown in Fig. 4, there are other conventional
There is also a device in which the drive shaft 1 of the drive means is arranged on the same axis as the swing support shaft 3 of the support frame 2 so that they are at the same height, but even in such conventional devices, the support shaft 3 and its surrounding parts are delicate. For this reason, there was a problem in that the support frame could not withstand the large torsional load applied to the support frame during steering, and there was a risk that the support shaft 3 or its peripheral members would be damaged. In FIG. 4, the left end of the drive shaft 1 is connected to a differential gear mechanism (not shown), and the axle case 4 housing the drive shaft 1 is connected to the body 5 via a fixing band 6. The support shaft 3 is pivotally supported by the end of an arm 7 fixed to the body 5, and wheels (not shown) or track belts are provided at both ends of the support frame 2 in the direction perpendicular to the drawing to act as a drive shaft. 1 allows it to be driven via sprockets 8, 9, a chain (not shown), etc.

(Means for Solving the Problems) Therefore, in order to solve the above problems, the present invention provides a traveling means in which a support frame is swingably supported on a body and has a plurality of wheels or a track belt provided on the support frame. and a driving means for driving the plurality of wheels or the endless track belt, wherein the support frame of the traveling means is swingably supported by the body via an annular portion formed on the support frame. The drive means is integrally attached to the support frame and has a drive shaft disposed concentrically within a radius of the annular portion.

(Operation/Effect) According to the swinging support structure for the traveling means configured as described above, the drive shaft of the drive means can be raised to the same height as the axis of the annular portion swingably connected to the support frame body. Therefore, the lowest part of the drive means (for example, a hydraulic motor) can also be raised higher than before, and can be prevented from hitting road protrusions. In addition, the support frame of the traveling means is swingably supported by the body via an annular part, and this annular part has a much larger diameter than a conventional support shaft so that it can contain the driving means, so it can be used for steering. It can withstand large torsional loads that are sometimes applied to the support frame. Furthermore, since the annular portion and the drive shaft of the drive means are arranged concentrically, the space required for them is reduced, and the vehicle body can be made smaller and simpler than before.

Further, since the driving means is integrally attached to the support frame, the driving means swings integrally when the support frame swings. Therefore, it is possible to prevent unreasonable force from being applied to the drive means due to the swinging of the support frame, thereby inhibiting smooth running, and preventing damage to components constituting the drive force transmission system.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. 1 to 3 are diagrams showing an embodiment of a swing support structure for a traveling means according to the present invention.

In FIG. 1, 15 is a body of the all-terrain vehicle, and an upper half bracket 17 is fixed to the lower side of the body 15. A semicircular recess 17a is formed in the lower part of the upper half bracket 17, and a bolt 18 is provided further below the upper half bracket 17.
The lower half bracket 20 hangs down and is fixed through. At the upper part of the lower half bracket 20, there is a full circular hole 21 together with the semicircular recess 17a of the upper half bracket 17.
A semicircular recess 20a is formed. As shown in FIG. 2, the upper half brackets 17 and the lower half brackets 20 are provided in pairs adjacent to each other.
A support frame 23 is provided between the lower half bracket 20 and the lower half bracket 20. The support frame 23 is formed in a substantially U-shaped configuration as shown in FIG. 1, and its interior is a space with a rectangular cross section as shown in FIG. Annular portions 23a are formed on both the front and back sides of the support frame 23, and the annular portions 23a
are upper half bracket 17 and lower half bracket 20
It fits into the full circular hole 21 formed by the respective semicircular recesses 17a and 20a. Semicircular recess 1
A gunmetal bearing 24 is interposed between 7a, 20a and the annular part 23a, and the support frame 23 is connected to the annular part 23a.
a. It is swingably connected to the body 15 via a gunmetal bearing 24, an upper half bracket 17, and a lower half bracket 20. As shown in FIG. 1, wheels 29, 29 are attached to both ends of the support frame 23 via axles 26, 27.
30 is provided, supporting frame 23 and wheels 2
9 and 30 constitute a traveling means 31. As shown in FIG. 2, in the center of the support frame 23 shown in FIG.
A hydraulic motor 33 (driving means) is integrally and fixedly provided inside the radius of a, and a drum brake device 34 is provided outside the body (on the wheel side). A switching valve 35 is provided at the left end of the hydraulic motor 33 in FIG. Hydraulic motor 33 generates the desired driving force. A drive shaft 33a protrudes from the end of the hydraulic motor 33 on the side of the support frame 23, and a brake shaft 34a and a drive shaft 33a protrude from the drum brake device 34 on the support frame 2.
They face each other at a distance from each other at approximately the center of the inner space. The drive shaft 33aa has a sprocket 37a,
A sprocket wheel 37 on which sprockets 37b are formed is fitted and fixed, and a sprocket wheel 38 on which sprockets 38a and 38b are formed is fitted and fixed on the brake shaft 34a. A single chain coupling 40 engages both sprockets 37b and 38b to rotationally connect them together. Therefore, even if the axes of the drive shaft 33a and the brake shaft 34a are slightly misaligned due to structural or assembly errors, the chain coupling 40 can absorb the misalignment and smoothly transmit rotation. . A chain 4 is hung on the sprocket 37a, and as shown in FIG. It has been passed. sprocket 4
A sprocket 48 (with a smaller diameter than sprocket 47) is provided coaxially with the axle 2.
A chain 43 is stretched between the sprocket 49 (larger in diameter than the sprocket 48) fixed to the sprocket 6 and the sprocket 48. As shown in FIG. 2, a chain 44 is attached to the sprocket 38a.
As shown in FIG. 3, this chain 44 is stretched between a sprocket 50 (having a larger diameter than the sprocket 38a) rotatably provided within the support frame 23. A sprocket 51 (with a smaller diameter than the sprocket 50) is provided coaxially with the sprocket 50, and a chain 45 is disposed between the sprocket 51 and a sprocket 52 (with a larger diameter than the sprocket 51) fixed to the axle 27. It's being passed around.

An all-terrain vehicle equipped with such a traveling means 31 and a driving means 33 first switches the switching valve 35 to operate the hydraulic motor 3 using a hydraulic pump (not shown).
3 causes the drive shaft 33a to rotate. The drive shaft 33a has a sprocket 37b,
38b and the chain coupling 40, the brake shaft 34a is rotated integrally. The rotation of the sprocket 37a is transmitted through the chain 42 to the sprocket 47 while being decelerated, and the rotation of the sprocket 42 is also transmitted through the sprocket 48 and the chain 43 to the sprocket 49, that is, the axle 26 while being decelerated, and ultimately The rotation of the sprocket 38a that rotates the wheel 29 is transmitted through the chain 44 to the sprocket 50 while being decelerated, and further to the sprocket 50.
The zero rotation is transmitted to the sprocket 52, that is, the axle shaft 27, through the sprocket 51 and the chain 45, while also being decelerated, and ultimately causes the wheel 30 to rotate. In this way, the drive shaft 33a of the hydraulic motor 33 applies rotational force to the wheels 29, 30, allowing the body 15 to move in a desired direction. When the rough terrain vehicle operates on uneven terrain, the support frame 23 has an annular portion 23a,
By swinging relative to the body 15 via the gunmetal bearing 24, the wheels 29 and 30 can rotate while always being in contact with the unevenness of the road surface. Therefore, it is possible to prevent a situation in which driving force and traction force become insufficient due to one of the wheels lifting up. When braking, the hydraulic motor 33
After removing the drive rotational force from the drive shaft 33a, the drum brake device 34 is operated to remove the drive shaft 33a.
When the rotation of the drive shaft 33a is gradually stopped, the rotation of the drive shaft 33a is also stopped via the chain coupling 40, thereby causing the chains 42, 43, 44,
45, Sprocket 47, 48, 49, 50, 5
1, 52 to the wheels 26, 27, that is, the wheel 2
Stop the rotation of 9 and 30.

Further, according to the rocking support structure of the traveling means according to this embodiment, the drive shaft 33a of the hydraulic motor 33 can be
Since the support frame 23 can be raised to the same height as the axis of the annular portion 23a swingably connected to the body 15, the lowest part of the hydraulic motor 33 can also be raised higher than before. It can prevent you from hitting road bumps. Further, the support frame 23 of the traveling means 31 is swingably supported by the body 15 via an annular portion 23a.
Since a has a much larger diameter than a conventional support shaft so as to accommodate the drive motor 33, it can sufficiently withstand a large torsional load applied to the support frame 23 during steering. Furthermore, the annular portion 23a
Since the drive shaft 33a of the hydraulic motor 33 and the drive shaft 33a of the hydraulic motor 33 are arranged concentrically, the space required for them is reduced, and the vehicle body can be made smaller and simpler than before. In particular, in the conventional rocking support structure of the traveling means shown in FIG. In the rocking support structure for the traveling means according to this embodiment, the annular portion 23a that swings and supports the support frame 23 is arranged radially concentrically with respect to the drive shaft 33a (i.e., the brake shaft 34a). They are significantly different in that they are Only because of these differences can the present invention achieve the effects described above.

Further, since the hydraulic motor 33 is integrally attached to the support frame 23, the hydraulic motor 33 is attached to the support frame 23.
When oscillates, it oscillates as a unit. Therefore, no unreasonable force is applied to the hydraulic motor 33 due to the swinging of the support frame 23, and therefore smooth running is prevented from being hindered due to unreasonable force being applied to the hydraulic motor 33. be able to.

On the other hand, if the hydraulic motor 33
(same as the conventional example shown in FIG. 4), the drive shaft 33
In addition to the driving force that transmits the rotational force to the wheels 30, when the support frame 23 swings greatly due to unevenness of the road surface, the swing causes the chains 42, 44 to
A rotational force that attempts to rotate the drive shaft 33a is inputted through the sprocket 37a and the sprocket 37a. Therefore, in addition to the rotational force of the hydraulic motor 33, another rotational force is input to the drive shaft 33a, and this other rotational force acts as a resistance to the rotational force of the hydraulic motor 33, or becomes an excessive rotational force. , smooth transmission of rotational force from the hydraulic motor 33 to the wheels 30 is inhibited.
As a result, the vehicle is subjected to sudden braking or acceleration forces, which impairs smooth running. Due to this, excessive force is applied to the drive power transmission system from the hydraulic motor 33 to the wheels 30, and in some cases, some of the components that make up the drive power transmission system may be damaged. , the vehicle may become unable to run.

However, in the present invention, since the hydraulic motor 33 is integrally attached to the support frame 23 as described above, even if the support frame 23 swings greatly, the hydraulic motor 33 also swings integrally, and the hydraulic motor 33 Since no rotational force is input other than the rotational force caused by There is no risk that some parts will be damaged and the vehicle will become unable to run.

In the above embodiment, the hydraulic motor 33 is used as the driving means, but an electric motor, an internal combustion engine, or any other driving means may be used. Further, wheels 29, 3 are provided on the support frame 23 of the traveling means 31.
Although the wheels 29 and 30 are provided, endless tracks may be provided instead of the wheels 29 and 30. Also, gunmetal bearing 2 is used as a bearing.
4 was used, however, any other bearing such as a needle bearing, a roller bearing, or the like may be used. Further, although the drum brake device 34 is used as a control means, any other control means such as a disc brake device may be used. In addition, the drive shaft 33a and the brake shaft 3
4a means that the rotation can be transmitted integrally through the sprockets 37b, 38b and the chain coupling 40, but any rubber coupling, Oldham coupling, or any other material that can absorb some misalignment of the axis may be used. It may also be a joint. Further, although a chain is used to transmit rotation from the drive shaft 33a or the brake shaft 34a to the wheels 29, 30, any mechanism such as a timing pulley or other mechanism that can reliably transmit rotation may be used.

[Brief explanation of the drawing]

1 to 3 are diagrams showing an embodiment of the swinging support structure for a traveling means according to the present invention, in which FIG. 1 is a front view thereof, FIG. The figure is a -arrow view in Figure 2,
The figure is a partial sectional view showing one of the conventional rocking support structures for traveling means. 15...Body, 17...Upper bracket, 1
7a...Semicircular recess, 18...Bolt, 20...Lower half bracket, 20a...Semicircle recess, 21...Full circular hole, 23...Support frame, 23a...Annular part, 24
...Gunmetal bearing, 26,27...Axle, 29,30
. . . Wheels, 31 . ,3
7b, 38a, 38b... Sprocket, 40...
...Chain coupler spring, 42-45...Chain, 47-52...Sprocket.

Claims (1)

[Scope of Claims] 1. A traveling means having a support frame swingably supported by a body and having a plurality of wheels or an endless track belt provided on the support frame, and a driving means for driving the plurality of wheels or an endless track belt. In the all-terrain vehicle, the support frame of the travel means is swingably supported by the body via an annular portion formed on the support frame, and the drive means is integrally attached to the support frame. A rocking support structure for a traveling means, further comprising a drive shaft disposed on a concentric circle radially inward of the annular portion.