JPH0529889U - Roller wheel support structure - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the size of equipment and improve assembly accuracy. [Structure] Crawler 1 on front and rear sprockets 14 and 15
6 is sewn around, and the sprockets 14 before and after that,
In the support structure of the rolling wheels of the traveling device 12 of the work vehicle 11 in which the plurality of rolling wheels 58 are disposed between 15, the support shaft 53 is provided at the lower end portion of the connecting arm 51 (support member) supported by the traveling device body. Is rotatably supported via bearings 54 and 55, and the roller wheels 58 divided into two in the rotation axis direction are integrally fixed to the shaft ends of the support shaft 53 by serration.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a support structure for a rolling wheel in a traveling device including a crawler for a work vehicle traveling on rough terrain.

[0002]

[Prior Art]

 Work vehicles traveling on soft ground such as rough terrain are equipped with crawlers as traveling devices. FIG. 2 is a side view of the work vehicle, and FIG. 3 is a sectional view taken along the line AA of FIG.

As shown in FIG. 2, the work vehicle 11 has a driver's seat 12 in the upper part and a traveling device 13 in the lower part. In the traveling device 13, front and rear sprockets 14 and 15 are rotatably driven, and crawlers 16 are wound around the sprockets 14 and 15. A plurality of rolling wheels 17 are mounted between the sprockets 14 and 15. That is, the middle portion of the support arm 18 is attached to the main body, and the upper ends of the support plates 19 having a triangular shape in a plan view and a U-shaped cross section are pivotally supported at both ends of the support arm 18. ing. Two rollers 17 are rotatably attached side by side to the lower part of the support plate 19.

As shown in FIG. 3, the crawler 16 has a core body 22 arranged inside a rubber body 21, and a plurality of core bodies 22 are provided below the core body 22 at regular intervals in the width direction. Piano wire 23 is provided, which constitutes a reinforcing member in the longitudinal direction of the crawler 16. Further, the core body 22 provided inside the crawler 16 is a wide plate-shaped member, and a projecting portion 24 projecting upward is integrally formed in the central portion thereof. The body of the core body 22 is covered with a relatively thick rubber member, and the periphery of the protruding portion 24 is covered with a relatively thin rubber member. The core body 22, the piano wire 23 and the like are integrally formed by a processing operation such as vulcanization of rubber during the manufacturing thereof.

On the other hand, the shaft ends of the support shaft 31 are fixed to the support plate 19 with bolts 32. The rolling wheels 17 are rotatably supported on the support shaft 31 by two bearings 33 and 34, which are respectively mounted on both sides in the axial direction. A floating seal formed of an O-ring 35 is interposed on the support shaft 31 and is located between the wheel 17 and the support plate 19.

The rolling wheel 17 includes a cylindrical portion 37 having a shaft hole 36, a rim 38 projecting from both sides of the cylindrical portion 37, and a flange 39 provided around the rim 38. A recess 40 surrounded by a rim 38 is formed around the central portion, and the projection 24 of the crawler 16 is accommodated in the recess 40.

Thus, in the traveling device of the work vehicle, the rolling wheels 17 rotate with respect to the support shaft 31 as the crawler 16 moves.

[0008]

[Problems to be solved by the device]

 In the support structure for the rolling wheels in the traveling device for a work vehicle described above, the rolling wheels 17 are rotatably supported by the central portion of the support shaft 31 having both ends fixed to the support plate 19. As means for integrally fixing the support shaft 31 and the support plate 19, a bolt 32, welding or the like can be considered. However, the fixing by the bolts 34 causes the support shaft 31 to easily loosen due to the vibration or the like because the rolling wheel 17 rotates with respect to the support shaft 31 and there is a risk that the support shaft 31 may be removed. Further, the fixing by welding has a problem that the welding accuracy is insufficient and the levelness of the support shaft 31 cannot be sufficiently secured.

Further, since the rolling wheel 17 is supported by the central portion of the support shaft 31 and is supported by the four bearings 33, 34, there is a problem that the entire apparatus becomes large.

The present invention solves such a problem, and an object of the present invention is to provide a support structure for a rolling wheel in which the device is downsized and the assembling accuracy is improved.

[0011]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a support structure for a wheel according to the present invention is a running vehicle for a work vehicle in which a front and rear sprockets are wound around a crawler and a plurality of wheels are arranged between the front and rear sprockets. In this device, the middle part of the support shaft is rotatably supported on the lower end of the support member supported by the traveling device main body, and the rolling wheels divided in the rotation axis direction are fixed to each shaft end of the support shaft. It is characterized by having done.

[0012]

[Action]

 The divided rolling wheels are supported by rotatably supporting the middle portion of the supporting shaft on the lower end of the supporting member and fixing the divided rolling wheels in the rotation axis direction to the respective shaft ends of the supporting shaft. Since the support shaft rotates integrally with the member, loosening is prevented, and the device can be downsized.

[0013]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view of a traveling device of a work vehicle showing a support structure for a wheel according to an embodiment of the present invention. It should be noted that the members having the same functions as those of the related art are designated by the same reference numerals and the duplicate description will be omitted.

In the traveling device for a work vehicle, as shown in FIG. 1, the connecting arm 51 as a supporting member has an upper part connected to a supporting plate (not shown), while an axial hole 52 is formed in the lower part. A support shaft 53 is inserted into the shaft hole 52 and is rotatably supported by a pair of bare rings 54 and 55. A serration portion 56 and a screw portion 57 are formed at each end of the support shaft 53.

The rolling wheel 58 is divided into two in the axial direction, and a shaft hole 59 that fits into the support shaft 53 is formed. The shaft hole 59 engages with the serration portion 56 of the support shaft 53, The rolling wheel 58 and the support shaft 53 can rotate integrally. Further, the rolling wheel 58 has a rim 60 protruding from the outer peripheral portion and a flange 61 provided around the rim 60, and a concave portion 62 surrounded by the rim 60 is provided around the central portion of the rolling wheel 58. The projection 62 of the crawler 16 is formed in the recess 62. Further, a floating seal composed of an O-ring 63 is interposed between the support shaft 53 and the rolling wheel 58.

Thus, the central portion of the supporting shaft 53 is rotatably supported in the shaft hole 52 of the connecting arm 51 via a pair of bearings 54 and 55, and a serration is provided at each end of the supporting shaft 53. The rolling wheels 58 are fitted through the connecting portions 56 and fixed by the bolts 64, whereby the supporting shaft 53 and the divided rolling wheels 58 are integrated. Therefore, in the traveling device of the work vehicle, the wheel 58 rotates integrally with the support shaft 53 as the crawler 16 moves.

[0018]

[Effect of the device]

 As described above in detail with reference to the embodiments, according to the support structure of the rolling wheels of the present invention, the traveling of the work vehicle in which the crawlers are wound around the front and rear sprockets and a plurality of rolling wheels are arranged between them. The middle part of the support shaft is rotatably supported on the lower end of the support member supported by the device, and the rolling wheels divided in the rotation axis direction are fixed to each end of the support shaft. Since the support shaft rotates integrally with the wheel, the support shaft can be easily assembled, the assembling accuracy can be improved, and the wheel disengagement can be prevented. Further, the rolling wheels are divided, and the central portion of the support shaft is rotatably supported by the support member, so that the size of the device can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a traveling device of a work vehicle showing a support structure for a wheel according to an embodiment of the present invention.

FIG. 2 is a side view of the work vehicle.

FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2 showing a conventional support structure for a wheel.

[Explanation of symbols]

 14, 15 Sprocket 16 Crawler 51 Connecting arm (supporting member) 53 Supporting shaft 54, 55 Bearing 56 Serration part 58 Rolling wheel 64 Bolt

Claims (1)

[Scope of utility model registration request] 1. A traveling device of a work vehicle in which a crawler is wound around front and rear sprockets, and a plurality of rolling wheels are arranged between the front and rear sprockets. A support structure for a rolling wheel, characterized in that an intermediate portion of a supporting shaft is rotatably supported at a lower end portion, and rolling wheels divided in a rotation axis direction are fixedly attached to respective shaft end portions of the supporting shaft.