Work vehicle

Abstract

To make it possible to use a bushing over a long term and at an inexpensive price in a work vehicle in which a swing component is swingably connected to a support shaft held by a pair of holding parts via a connection cylinder part and the bushing is provided between the support shaft and the connection cylinder part.SOLUTION: A work vehicle comprises an annular gap filling component 34 which is positioned between a holding part 30 and an end 32a of a connection cylinder part 32 and externally fits to a support shaft 31. The gap filling component 34 fills a gap between the holding part 30 and the end 32a of the connection cylinder part 32. A cover part 34a is formed on an outer peripheral part of the gap filling component 34. The cover part 34a externally fits to the end 32a of the connection cylinder part 32 in the state of covering the end 32a of the connection cylinder part 32 over the whole circumference thereof.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a work vehicle. [Background technology]

[0002] As shown in Patent Document 1, there is a work vehicle (multipurpose work vehicle) that is equipped with a suspension device, in which an upper arm and a lower arm are held on a vehicle frame so as to be able to swing up and down, and a knuckle arm that is connected to the free end of the upper arm and the free end of the lower arm and holds the wheels. This type of work vehicle is equipped with a pair of holding parts, a spindle held by the pair of holding parts, a connecting tube part that rotatably fits onto the spindle between the pair of holding parts, and a bushing provided between the spindle and the connecting tube part, each for an upper arm and a lower arm, wherein the upper arm is connected to the connecting tube part for the upper arm and connected to the spindle by the connecting tube part, thereby being held by the pair of holding parts so as to be able to swing up and down, and the lower arm is connected to the connecting tube part for the lower arm and connected to the spindle by the connecting tube part, thereby being held by the pair of holding parts so as to be able to swing up and down. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-25226 A Summary of the Invention [Problem to be solved by the invention]

[0004] Conventionally, in a work vehicle equipped with a swinging member such as the upper arm or lower arm, wear of the bushings is reduced by filling them with grease and periodically adding grease. In addition, the bushings are periodically replaced. Filling the bushings with grease increases costs. This requires the troublesome task of performing regular maintenance.

[0005] To provide a work vehicle which allows bushings to be used for a long period of time and is inexpensive. [Means for solving the problem]

[0006] The work vehicle according to the present invention comprises: The bearing comprises a pair of retaining portions, a spindle held by the pair of retaining portions, a connecting tube portion rotatably fitted onto the spindle between the pair of retaining portions, a oscillating member connected to the connecting tube portion and oscillably connected to the spindle by the connecting tube portion, a bushing provided between the spindle and the connecting tube portion, and an annular gap filling member positioned between the retaining portion and an end of the connecting tube portion and fitted onto the spindle to fill the gap between the retaining portion and the end portion, and a cover portion is formed on the outer periphery of the gap filling member to fit onto the end portion in a state covering the entire circumference of the end portion.

[0007] According to this configuration, the gap between the connecting tubular portion and the holder is filled with the gap filling member, and the end of the connecting tubular portion is covered by the cover portion, so that the gap filling member prevents dust from entering the bushing. By preventing dust from entering the bushing, the bushing is less likely to wear out, so the bushing can be used for a long period of time. By simply providing the gap filling member, the bushing is less likely to wear out, and because the bushing is less likely to wear out, there is no need to fill it with grease or add it periodically, so it is inexpensive.

[0008] In the present invention, It is preferable that the gap filling member is fixed to the connecting tube portion so as not to move when the swinging member swings.

[0009] When the gap filling member rotates attached to the connecting cylinder portion that rotates due to the swinging of the swinging member, dust tends to be drawn into the gap filling member due to its rotation. With this configuration, the gap filling member does not rotate, so dust can be prevented from being drawn in, and wear caused by dust adhering to the bushing can be prevented.

[0010] In the present invention, It is preferable that an end of the bushing is provided with a flange portion that fits between the gap filling member and the end of the connecting tubular portion.

[0011] According to this configuration, contact between the end of the connecting cylinder and the gap filling member is prevented by the flange, so that the connecting cylinder rotates smoothly and the swinging member swings easily.

[0012] In the present invention, It is preferable that the support shaft is provided on its outer periphery with a collar portion that fits into the bushing.

[0013] According to this configuration, when the connecting cylinder portion rotates due to the swing of the swing member and the bushing attempts to move with respect to the connecting cylinder portion, the bushing can be prevented from sliding relative to the collar portion and being subjected to an operating force such as twisting the bushing. In other words, the collar portion can prevent the bushing from being damaged due to an operating force such as twisting.

[0014] In the present invention, It is preferable that the oscillating member is held on the vehicle frame via the connecting tube portion, the support shaft and the pair of retaining portions so that it can swing up and down, and that a wheel retaining member which rotatably holds the wheel is provided at the free end of the oscillating member.

[0015] According to this configuration, the wheels are attached to the body frame via the swinging members so that they can be raised and lowered, making it easy to travel on rough ground. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a side view of the utility vehicle as seen from the left side. [Diagram 2] FIG. 4 is a rear view showing a holding structure for a pair of left and right rear wheels. [Diagram 3] FIG. 4 is a plan view showing a holding structure for a pair of left and right rear wheels. [Figure 4] FIG. 2 is a perspective view of a suspension device. [Diagram 5] 4 is a cross-sectional view showing a holding structure for an upper swing member and a lower swing member. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, with regard to the traveling body of a multi-purpose vehicle (an example of a "work vehicle"), the direction of arrow F shown in Figures 1, 3, etc. is the "front side of the body", the direction of arrow B shown in Figures 1, 3, etc. is the "rear side of the body", the direction of arrow U shown in Figures 1, 2, etc. is the "upper side of the body", the direction of arrow D shown in Figures 1, 2, etc. is the "lower side of the body", the direction of arrow L shown in Figures 2, 3, etc. is the "left side of the body", and the direction of arrow R shown in Figures 2, 3, etc. is the "right side of the body". The left-right direction of the body corresponds to the width direction of the body.

[0018] [Overall configuration of multi-purpose vehicle] The utility vehicle shown in FIG. 1 is used for multiple purposes such as transporting luggage and recreation. The utility vehicle is provided with a vehicle body 4 having a vehicle body frame 1, a pair of left and right front wheels 2 held in a steerable and drivable manner at the front of the vehicle body frame 1, and a pair of left and right rear wheels 3 held in a drivable manner at the rear of the vehicle body frame 1. A boarding section 5 is provided at a portion between the front wheels 2 and the rear wheels 3 of the vehicle body 4. The boarding section 5 is provided with a front boarding section 5A and a rear boarding section 5B, and a rope 6 surrounding the boarding space of the front boarding section 5A and the boarding space of the rear boarding section 5B. The front boarding section 5A is provided with a driver's seat 7 and a steering wheel 8 for steering the front wheels 2. A cargo bed 9 is provided on the vehicle body rearward of the boarding section 5.

[0019] 2 and 3, a suspension device 20 is provided across each of the pair of left and right rear wheels 3 and a rear wheel holding frame 10 provided on the body frame 1. Each of the pair of left and right rear wheels 3 is held by the body frame 1 via the suspension device 20 and can be raised and lowered relative to the traveling body 4.

[0020] The rear wheel holding frame 10 is provided at the rear of the body frame 1, as shown in Fig. 1. As shown in Figs. 2, 3, and 4, the rear wheel holding frame 10 includes a first support frame 11 erected at the rear of a main frame 1a of the body frame 1 that extends in the front-rear direction of the vehicle body, and a second support frame 12 erected on the main frame 1a on the vehicle body rear side of the first support frame 11. An upper end of the first support frame 11 and a middle part in the up-down direction of the second support frame 12 are connected by a reinforcing frame 13. A stay 15 is connected to an upper end of the second support frame 12 and a third support frame 14 erected at a middle part of the reinforcing frame 13.

[0021] As shown in Figs. 2, 3 and 4, each suspension device 20 of the pair of left and right rear wheels 3 includes an upper swing member 21 held by the first support frame 11 and the second support frame 12 so as to be vertically swingable, a lower swing member 22 held by the first support frame 11 and the second support frame 12 so as to be vertically swingable below the upper swing member 21, a wheel support member 23 connected to the free end of the upper swing member 21 and the free end of the lower swing member 22, and a cushion mechanism 24 connected to the lower swing member 22 and the stay 15. The cushion mechanism 24 includes a shock absorber 24a and a cushion spring 24b. A stabilizer 25 is connected between the lower swing member 22 of the left rear wheel 3 and the lower swing member 22 of the right rear wheel 3. In Fig. 4, the cushion mechanism 24 is omitted.

[0022] 2 and 3, an upper portion of the wheel support member 23 is swingably connected to a pair of holding portions 21b provided at the free end portion of the upper swing member 21 with a connecting shaft 23a extending in the vehicle front-rear direction as a swing fulcrum. A lower portion of the wheel support member 23 is swingably connected to a pair of holding portions 22b provided at the free end portion of the lower swing member 22 with a connecting shaft 23b extending in the vehicle front-rear direction as a swing fulcrum. A detachable flange 26 of the rear wheel 3 is provided on the wheel support member 23 so as to be rotatable.

[0023] The wheel support member 23 is connected to the rear wheel holding frame 10 via the upper swing member 21 and the lower swing member 22 so as to be movable up and down. The rear wheel 3 is attached to the flange 26, The rear wheel 3 is held by a rear wheel holding frame 10 so as to be able to rise and fall.

[0024] As shown in Figs. 2, 3 and 4, the upper swing member 21 has a pair of front and rear arm portions 21a that are spaced apart in the vehicle body front-rear direction. The free ends of the pair of front and rear arm portions 21a are connected to each other. In this embodiment, the upper swing member 21 is made of a steel pipe material bent into a U-shape in a plan view. The front arm portion 21a of the pair of front and rear arm portions 21a is connected to the first support frame 11 so as to be able to swing up and down, and the rear arm portion 21a of the pair of front and rear arm portions 21a is connected to the second support frame 12 so as to be able to swing up and down, whereby the upper swing member 21 is held by the first support frame 11 and the second support frame 12 so as to be able to swing up and down.

[0025] As shown in Figs. 2, 3 and 4, the lower swing member 22 has a pair of front and rear arm portions 22a that are spaced apart in the front-rear direction of the vehicle body. The free ends of the pair of front and rear arm portions 22a are connected to each other. In this embodiment, the lower swing member 22 is configured by combining and connecting a plurality of steel pipe materials to form a V-shape in a plan view. The front arm portion 22a of the pair of front and rear arm portions 22a is connected to the first support frame 11 so as to be able to swing up and down, and the rear arm portion 22a of the pair of front and rear arm portions 22a is connected to the second support frame 12 so as to be able to swing up and down, whereby the lower swing member 22 is held by the first support frame 11 and the second support frame 12 so as to be able to swing up and down.

[0026] The front arm portion 21a of the upper swing member 21 is connected to the first support frame 11 based on a connecting structure K shown in FIG. That is, as shown in Figure 5, the connecting structure K includes a pair of retaining portions 30 provided on the first support frame 11, a support shaft 31 held by the pair of retaining portions 30, a connecting tubular portion 32 fitted onto the support shaft 31 between the pair of retaining portions 30, a bushing 33 provided between the connecting tubular portion 32 and the support shaft 31, and gap filling members 34 provided on both end sides of the connecting tubular portion 32.

[0027] The pair of holding parts 30 are arranged to be aligned at a predetermined interval in a direction along the pivot axis P1 of the upper pivot member 21. The support shaft 31 is arranged so that its axis coincides with the pivot axis P1 of the upper pivot member 21.

[0028] The connecting cylinder portion 32 is rotatably fitted onto the support shaft 31 and is connected to the arm portion 21a, thereby connecting the arm portion 21a to the support shaft 31 so as to be able to swing.

[0029] A collar portion 35 is provided on the outer periphery of the support shaft 31. The collar portion 35 is configured to be fitted inside the bushing 33. When the connecting tubular portion 32 rotates due to the swing of the upper swing member 21 and the bushing 33 attempts to rotate attached to the connecting tubular portion 32, the bushing 33 slides relative to the collar portion 35, thereby preventing the bushing 33 from being subjected to an operating force that would twist the bushing 33.

[0030] The gap filling members 34 provided on both ends of the connecting tube portion 32 are positioned between the end portion 32a of the connecting tube portion 32 and the retaining portion 30, and are configured in an annular shape to fit around the collar portion 35 of the support shaft 31, so as to fill the gap between the end portion 32a of the connecting tube portion 32 and the retaining portion 30. A cover portion 34a that fits around the end portion 32a of the connecting tube portion 32 is formed on the outer periphery of the gap filling member 34. The cover portion 34a is configured in an annular shape to cover the entire circumference of the end portion 32a of the connecting tube portion 32. The gap filling members 34 prevent dust from entering between the end portion 32a of the connecting tube portion 32 and the cover portion 34a, and between the retaining portion 30 and the end portion 32a of the connecting tube portion 32 toward the bushing 33.

[0031] The end of the bushing 33 is provided with a flange 33a that fits between the gap filling member 34 and the end 32a of the connecting tubular portion 32. The flange 33a prevents contact between the end 32a of the connecting tubular portion 32 and the gap filling member 34, allowing the connecting tubular portion 32 to rotate smoothly.

[0032] 5, the bushing 33 is composed of two split bushings 33b located at one end and the other end of the connecting tubular portion 32. The split bushing 33b can be assembled by inserting it between the connecting tubular portion 32 and the collar portion 35 from the end without the flange portion 33a.

[0033] When the connecting tube portion 32 rotates due to the swing of the upper swing member 21, the gap filling member 34 moves with the connecting tube portion 32, and the rotation of the gap filling member 34 causes dust to be caught between the gap filling member 34 and the holding portion 30. In order to avoid this entrapment, the gap filling member 34 is fixed to the collar portion 35 and configured not to move with the connecting tube portion 32. More specifically, the collar portion 35 is fastened and fixed by the fastening force of the screw shaft constituting the support shaft 31 so as not to rotate with respect to the holding portion 30. The gap filling member 34 is provided with an attachment hole 34b that is fitted onto the collar portion 35. The gap filling member 34 is fixed to the collar portion 35 by setting a fit tolerance between the attachment hole 34b and the outer diameter of the collar portion 35. As a fixing means for fixing the collar portion 35 to the holding portion 30 so that it does not rotate, in addition to a fixing means for fastening the collar portion 35 to the holding portion 30 by means of a support shaft 31, a fixing means for fixing the collar portion 35 to the holding portion 30 by a fit intersection between the axial length of the collar portion 35 and the spacing between a pair of holding portions 30 can be used.

[0034] The connecting structure connecting the rear arm portion 21a of the upper swing member 21 to the second support frame 12 has the same configuration as the connecting structure M connecting the front arm portion 21a of the upper swing member 21 to the first support frame 11. However, in the connecting structure connecting the rear arm portion 21a of the upper swing member 21 to the second support frame 12, a pair of holding portions 30 are provided on the second support frame 12 and are arranged to be aligned at a predetermined interval in a direction along the swing axis P1 of the upper swing member 21. The support shaft 31 is arranged so that its axis is coincident with the swing axis P1 of the upper swing member 21.

[0035] The connecting structure connecting the front arm portion 22a of the lower swing member 22 to the first support frame 11 has the same configuration as the connecting structure M connecting the front arm portion 21a of the upper swing member 21 to the first support frame 11. However, in the connecting structure connecting the front arm portion 22a of the lower swing member 22 to the first support frame 11, the pair of holding portions 30 are arranged to be aligned at a predetermined interval in the direction along the swing axis P2 of the lower swing member 22. The support shaft 31 is arranged so that its axis is coincident with the swing axis P2 of the lower swing member 22.

[0036] The connecting structure connecting the rear arm portion 22a of the lower swing member 22 to the second support frame 12 has the same configuration as the connecting structure M connecting the front arm portion 21a of the upper swing member 21 to the first support frame 11. However, in the connecting structure connecting the rear arm portion 22a of the lower swing member 22 to the second support frame 12, a pair of holding portions 30 are provided on the second support frame 12 and are arranged to be aligned at a predetermined interval in the direction along the swing axis P2 of the lower swing member 22. The support shaft 31 is arranged so that its axis is coincident with the swing axis P2 of the lower swing member 22.

[0037] [Another embodiment] (1) In the above embodiment, an example has been shown in which the upper rocking member 21 and the lower rocking member 22 for the rear wheels are applied to a structure held by the body frame 1, but this is not limiting. For example, the present invention may be applied to a structure in which the upper rocking member and the lower rocking member constituting the suspension device for the front wheels 2 are held by the body frame 1, or to a structure in which the wheel support member 23 is rockably supported by the upper rocking member 21 or the lower rocking member 22, or to a structure in which the cushion mechanism 24 is rockably supported by the lower rocking member 22, the upper rocking member 21, or the body frame 1.

[0038] (2) In the above embodiment, an example was shown in which the gap filling member 34 was attached to the connecting tubular portion 32 and did not move. However, the gap filling member 34 may be attached to the connecting tubular portion 32 and move.

[0039] (3) In the above embodiment, an example was shown in which the flange portion 33a was provided on the bushing 33, but the bushing 33 may not be provided with the flange portion 33a.

[0040] (4) In the above embodiment, an example was shown in which the collar portion 35 was provided, but the collar portion 35 may not be provided. [Industrial Applicability]

[0041] The present invention is not limited to being applicable to multi-purpose vehicles, but can also be applied to various types of work vehicles, such as transport vehicles. [Explanation of symbols]

[0042] 1 Body frame 21 Upper swing member (swing member) 22 Lower swing member (swing member) 23 Wheel support member 30 Holding part 31 Spindle 32 Connecting cylinder part 32a end 33 Bush 3a Tsuba 34 Gap filling material 34a Cover part 35 Color Section

Claims

1. A pair of holding portions; A support shaft held by the pair of holding portions; a connecting tubular portion rotatably fitted onto the support shaft between the pair of holding portions; a swing member connected to the connecting cylinder portion and swingably connected to the support shaft by the connecting cylinder portion; a bushing provided between the support shaft and the connecting tubular portion; a ring-shaped gap filling member that is positioned between the holding portion and the end of the connecting tube portion and is fitted onto the support shaft to fill a gap between the holding portion and the end, A work vehicle in which a cover portion is formed on the outer periphery of the gap filling member so as to fit over the end portion in a state covering the entire periphery of the end portion.

2. 2. The work vehicle according to claim 1, wherein the gap filling member is fixed to the connecting tube portion so as not to move when the swinging member swings.

3. 3. The work vehicle according to claim 1, wherein an end of the bushing is provided with a flange that fits between the gap filling member and the end of the connecting tube portion.

4. 2. The work vehicle according to claim 1, wherein the support shaft is provided on an outer periphery thereof with a collar portion that fits into the bushing.

5. the swing member is held by the vehicle body frame via the connecting cylinder portion, the support shaft, and the pair of holding portions so as to be swingable up and down; 2. A work vehicle according to claim 1, wherein a wheel support member for rotatably supporting a wheel is provided at a free end of said swinging member.

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