JPS63121514A - Oscillation supporting structure of running means - Google Patents

Abstract

PURPOSE:To prevent the extreme bottom surface of the motor of a rough terrain running vehicle from colliding with the road surface and to make it compact by supporting the supporting framework of a running means on a vehicle body by means of protruding ring-shaped portions and connecting it to a driving means through a drive shaft arranged in a concentrical shape on the inside in the radius direction of the ring-shaped portions. CONSTITUTION:An upper half bracket 17 and a lower half bracket 20 are provided on the bottom of a body 15, and a supporting framework 23 is supported by fitting ring-shaped portions 23a formed on both inside and outside of the supporting framework 23 into a full circular hole 21 formed by a half circle recesses 17a and 20a of the brackets 17 and 20. And wheels 30 are supported at both ends of the supporting framework 23. A hydraulic motor 33 is interposed in the center portion of the supporting framework 23 on the center side of a body and a brake device 34 is provided on the outside of the body with a drive shaft 33a penetrating concentrically through the inside of the supporting framework 23 and connected to the hydraulic motor 33. The extreme bottom of the motor can be prevented from colliding with the road surface by this constitution.

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 filed by the present applicant. In this conventional all-terrain vehicle, the 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 at the same location as the main shaft (to which it is connected), its drive shaft is placed 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, there is a risk that it cannot 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 is another conventional device in which the drive shaft 1 of the drive means is arranged on the same axis and at the same height as the swing shaft 3 of the support frame 2. This conventional type also has the problem that the support shaft 3 and its surrounding parts are delicate and cannot withstand the large torsional load applied to the support frame during steering, and there is a risk that the support shaft 3 or its surrounding parts may be damaged. Ta.

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 fixed 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, and the drive shaft 1 drives the sprocket. 8.9 or a chain (not shown).

(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 has a drive shaft arranged concentrically within a radius of the annular portion.

(Operation/Effect) According to the rocking 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 that swingably connects the support frame to the body. Since it can be raised, the lowest part of the drive means (for example, a hydraulic motor) can also be raised higher than before, and it is possible to prevent it from hitting road bumps. 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. 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.

(Example) Hereinafter, an example of the present invention will be described 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 the body of the off-road vehicle;
An upper half bracket 17 is fixed to the lower side of this body 15. The lower part of the upper half bracket 17 has four semicircular parts 17.
Further below this upper half bracket 17, a lower half bracket 20 is fixed in a downwardly downward manner via bolts 18. A full circular hole 21 is provided at the upper part of the lower half bracket 20 together with the semicircular four parts 17a of the upper half bracket 17.
A semicircular recess 20a is formed.

As shown in FIG. 2, the upper half bracket 17 and the lower half bracket 20 are provided in pairs adjacent to each other, and a support frame 23 is interposed between the pair of the upper half bracket 17 and the lower half bracket 20. It is well established. As shown in FIG. 1, the support frame 23 is formed into a substantially U-shape, and its interior is a space with a rectangular cross section as shown in FIG. An annular portion 23a is formed on both the front and back sides of the support frame 23, and this annular portion 23
a fits into a full circular hole 21 formed by the semicircular recesses 17a and 20a of the upper half bracket 17 and the lower half bracket 20, respectively. A gunmetal bearing 24 is interposed between the semicircular recesses 17a, 20a and the annular portion 23a,
The support frame 23 is swingably connected to the body 15 via an annular portion 23a, a gunmetal bearing 24, an upper half bracket 17, and a lower half bracket 20. At both ends of the support frame 23, first
Wheel 29.3 via axle 26.27 as shown in the figure.
0 is provided, supporting frame 23 and wheels 29.30
constitutes a traveling means 31.

As shown in FIG. 2, a hydraulic motor 33 (driving means) is provided at the center of the support frame 23 shown in FIG. A drum brake device 34 is provided. A switching valve 35 is provided at the left end of the hydraulic motor 33 in FIG. 2, and by switching the hydraulic pressure from a hydraulic pump (not shown) using the switching valve 35, the hydraulic motor 33 generates a desired driving force.

A drive shaft 33a is connected from the support frame 23 side end of the hydraulic motor 33.
The brake shaft 34a and the drive shaft 33a that protrude from the drum brake assembly W34 are spaced apart from each other and face each other approximately at the center of the support frame 23 interior space. Drive shaft 3
A sprocket wheel 37 on which sprockets 37a and 37b are formed is fitted and fixed to the brake shaft 34a, and a sprocket wheel 38 on which sprockets 38a and 38b are formed is fitted and fixed on the brake shaft 34a. One chain coupling 40 is engaged with both sprockets 37b and 38b to integrally rotationally connect them. Therefore, due to structural and assembly errors, the drive shaft 3
Even if the axes of brake shaft 3a and brake shaft 34a are slightly misaligned, chain coupling 40 can absorb the misalignment and smoothly transmit rotation. A chain 42 is attached to the sprocket 37a, and as shown in FIG. has been passed.

A sprocket 48 (smaller in diameter than the sprocket 47) is provided coaxially with the sprocket 47, and a sprocket 49 (sprocket 48) fixed to the axle 26 is provided coaxially with the sprocket 47.
A chain 43 is passed between the sprocket 48 (which has a larger diameter) and the sprocket 48. As shown in FIG. 2, a chain 44 is hung on the sprocket 38a, and this chain 44 is attached to a sprocket 50 (sprocket 38a) rotatably provided within the support frame 23 as shown in FIG.
The hook is passed between the diameter of the diameter is larger than that of a. A sprocket 51 (smaller in 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 (larger in diameter than the sprocket 51) fixed to the axle 27.
The stake has been passed.

An all-terrain vehicle equipped with such a traveling means 31 and a driving means 33 first switches the switching valve 35 and operates the hydraulic motor 33 with a hydraulic pump (not shown) to drive and rotate the drive shaft 33a. The drive shaft 33a integrally rotates the brake shaft 34a via sprockets 37b, 38b and a chain coupling 40.

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 47 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 Rotate the wheel 29. The rotation of the sprocket 38a is transmitted to the sprocket 50 via the chain 44 while being decelerated, and the rotation of the sprocket 50 is further transmitted to the sprocket 51 and the chain 45.
It is transmitted to the sprocket 52, that is, the axle shaft 27, through the sprocket 52, ie, the axle 27, while being decelerated, ultimately causing 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 all-terrain vehicle travels on uneven terrain, the support frame 23 swings relative to the body 15 via the annular portion 23a and the gunmetal bearing 24, so that the wheels 29 and 30 are always aligned with the road surface. It is possible to rotate while touching the ground on uneven surfaces. For this reason,
It is possible to prevent a situation in which driving force and traction force are insufficient due to one of the wheels lifting up. When braking, after removing the drive rotational force from the drive shaft 33a of the hydraulic motor 33, the drum brake device 34 is activated to gradually stop the rotation of the brake shaft 34a. The chain also stops rotating, which causes the chain 42.43.44.45
, the rotation of the axle 26.27 or the axle 29.30 is stopped via the sprockets 47, 48, 49, 50, 51, 52.

Further, according to the rocking support structure of the traveling means according to this embodiment, the drive shaft 33a of the hydraulic motor 33 is placed at the same height as the axis of the annular portion 23a that swingably connects the support frame 23 to the body 15. Since the lowermost part of the hydraulic motor 33 can be raised higher than before,
It can prevent you from hitting road bumps. Also,
The support frame 23 of the traveling means 31 is swingably supported by the body 15 via an annular portion 23a, and this annular portion 23a has a diameter much larger than that of a conventional support shaft so as to accommodate the drive motor 33 therein. Therefore, the large torsional load applied to the support frame 23 during steering can be sufficiently withstood. Furthermore, since the annular portion 23a 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 connected to the drive shaft 33.
A (that is, the brake shaft 34a) is significantly different in that it is arranged radially concentrically with respect to the brake shaft 34a. Only because of these differences can the present invention achieve the effects described above.

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. In addition, although wheels 29.30 were provided on the support frame 23 of the traveling means 31, the wheels 29.30
An endless track belt may be provided in place of the bearing.Although the gunmetal bearing 24 is used as the bearing, any other bearing such as a needle bearing, a roller bearing, etc. may be used.Also, a drum brake device, 34 may be used as the braking means. However, any braking means such as a disc brake device may be used. Also, rotation can be integrally transmitted between the drive shaft 33a and the brake shaft 34a via the sprockets 37b, 38b and the chain coupling 40. However, any type of joint such as a rubber coupling, Oldham's joint, or any other type of joint that can absorb some misalignment of the axis may be used.

Furthermore, although a chain is used to transmit rotation from the drive shaft 33a or 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. 2 is a sectional view taken along the line ■-■ in FIG. FIG. 3 is a view taken along the line ■--■ in FIG. 2, and FIG. 4 is a partial sectional view showing one of the conventional rocking support structures for traveling means. 15...Body 17...Upper bracket 17a...Semicircular recess 18...Bolt 20...Lower half bracket 20a...Semicircle recess 21...Full circular hole 23...Support frame 23a... Annular portion 24... Gunmetal bearing 26.27... Axle 29.30... Wheel 31... Traveling means 33... Hydraulic motor 33a... Drive shaft 34... Drum brake Device 34a...Brake shaft 35...Switching valve 37, 38...Sprocket wheels 37a, 37b, 38a, 38b...Sprocket 40...Chain couplings 42-45...Chain 47-52. ··sprocket

Claims (1)

[Claims] A traveling device for traveling on rough terrain, comprising: 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 vehicle, the support frame of the traveling means is swingably supported by the body via an annular portion formed on the support frame, and the drive means has a drive shaft disposed on a concentric circle radially inward of the annular portion. A rocking support structure for a traveling means, characterized by: