Work vehicles

Abstract

To provide a work vehicle capable of preventing an arm cylinder from being damaged.SOLUTION: A work vehicle comprises an arm cylinder configured to control lifting of an arm assembly. A front plate is attached on a vehicle body frame at a front side of the arm cylinder. A rear plate is attached on the vehicle body frame at a rear side of the arm cylinder. Side frames are attached on the front plate and the rear plate at opposite sides in left and right directions to the vehicle body frame for the arm cylinder. A lower plate is attached on the vehicle body frame and the side frames at a lower side of the arm cylinder. The front plate extends along a reference direction where the arm cylinder is directed when a tool attached on the arm assembly touches the ground. The lower plate comprises a lower extension part extending along the reference direction below a second rotational shaft. The lower extension part, the front plate, the side plates, and the vehicle body frame form an opening below the arm cylinder.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

[0002] Patent Document 1 discloses a work vehicle in which an arm cylinder is placed in a lower closed space surrounded by an outer wall, an inner wall, a rear connecting wall, and a mounting plate of a machine frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-065482 A Summary of the Invention [Problem to be solved by the invention]

[0004] The work vehicle of Patent Document 1 has an opening at the top to allow the arm cylinder to pass through, but if dust enters through the opening and accumulates, there is a risk that the arm cylinder will be damaged.

[0005] The technology disclosed in the present application aims to provide a work vehicle that prevents damage to the arm cylinder while preventing dust from entering the above-mentioned lower enclosed space from below. [Means for solving the problem]

[0006] A work vehicle according to a first aspect of the present disclosure includes a vehicle body frame, an arm assembly, an arm cylinder, a front plate, a rear plate, a side plate, and a lower plate. The vehicle body frame has a front-rear direction, a left-right direction perpendicular to the front-rear direction, and a height direction perpendicular to the front-rear direction and the left-right direction. The arm assembly is attached to the vehicle body frame so as to be rotatable about a first rotation axis extending in the left-right direction. The arm cylinder is attached to the vehicle body frame so as to be rotatable about a second rotation axis substantially parallel to the first rotation axis, and is configured to control the elevation and lowering of the arm assembly in the height direction. The front plate is attached to the vehicle body frame on the front side of the arm cylinder in the front-rear direction. The rear plate is attached to the vehicle body frame on the rear side of the arm cylinder in the front-rear direction. The side plate is attached to the front plate and the rear plate on the opposite side of the vehicle body frame in the left-right direction with respect to the arm cylinder. The lower plate is attached to the vehicle body frame and the side frame on the lower side of the arm cylinder in the height direction. The vehicle body frame, the front plate, the rear plate, and the side plates surround the arm cylinder. The front plate extends along a reference direction in which the arm cylinder faces when a work tool attached to the arm assembly touches the ground. The lower plate has a downward extension portion that extends along the reference direction below the second rotation shaft in the height direction. The downward extension portion, the front plate, the side plates, and the vehicle body frame form an opening below the arm cylinder.

[0007] A work vehicle according to a second aspect of the present disclosure includes a vehicle body frame, an arm assembly, an arm cylinder, a front plate, a rear plate, a side plate, and a lower plate. The vehicle body frame has a front-rear direction, a left-right direction perpendicular to the front-rear direction, and a height direction perpendicular to the front-rear direction and the left-right direction. The arm assembly is attached to the vehicle body frame so as to be rotatable about a first rotation axis extending in the left-right direction. The arm cylinder is attached to the vehicle body frame so as to be rotatable about a second rotation axis substantially parallel to the first rotation axis, and is configured to control the elevation and lowering of the arm assembly in the height direction. The front plate is attached to the vehicle body frame on the front side of the arm cylinder in the front-rear direction. The rear plate is attached to the vehicle body frame on the rear side of the arm cylinder in the front-rear direction. The side plate is attached to the front plate and the rear plate on the opposite side of the vehicle body frame in the left-right direction with respect to the arm cylinder. The lower plate is attached to the vehicle body frame and the side frame on the lower side of the arm cylinder in the height direction. The vehicle frame, the front plate, the rear plate, and the side plate surround the arm cylinder. The front plate extends along a reference direction in which the arm cylinder faces when a work tool attached to the arm assembly is grounded. When the arm cylinder faces the reference direction, a line formed by connecting multiple front ends of the arm cylinders corresponding to multiple heights in the height direction is extended along the reference direction to form a first line. When the arm cylinder faces the reference direction, a line formed by connecting multiple rear ends of the arm cylinders corresponding to multiple heights is extended along the reference direction to form a second line. When viewed in the left-right direction, the front end of the lower plate in the front-rear direction is located between the first line and the second line in the cylinder width direction perpendicular to the reference direction and the left-right direction. The front end of the lower plate, the front plate, the side plate, and the vehicle frame form an opening below the arm cylinder. Effect of the Invention

[0008] According to the technology disclosed in the present application, for example, a work vehicle can be provided that prevents damage to the arm cylinder while preventing dust from entering from below into the lower closed space that houses the arm cylinder. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a side view of a work vehicle. [Diagram 2] FIG. 2 is a top view of the work vehicle. [Diagram 3] FIG. 3 is an enlarged view of the arm cylinder and its surroundings as viewed from above. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV' in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the drawings showing embodiments thereof. In the drawings, the same reference numerals indicate corresponding or substantially identical components. <Embodiment> <Overall composition>

[0011] 1 and 2, a work vehicle 1, for example, a compact track loader, includes a vehicle body frame 2, a traveling device 3, a working device 4, and a cabin 5. The vehicle body frame 2 supports the traveling device 3, the working device 4, and the cabin 5. In the illustrated embodiment, the traveling device 3 is a track-type traveling device. Therefore, the traveling device 3 includes a driving wheel 31, driven wheels 32 and 33, and a roller 34. However, the traveling device 3 is not limited to a track-type traveling device. The traveling device 3 may be, for example, a front-wheel / rear-wheel traveling device, or a traveling device having front wheels and a rear crawler. The working device 4 includes a work equipment (bucket) 41 at a distal end of the working device 4. A proximal end of the working device 4 is attached to the rear of the vehicle body frame 2. The working device 4 includes a pair of arm assemblies 42 for rotatably supporting the bucket 41 via a bucket pivot shaft 43. Each of the pair of arm assemblies 42 includes a lift link 44 and an arm 45 .

[0012] The lift link 44 is rotatable relative to the vehicle body frame 2 around a fulcrum shaft 46. In the following embodiments, the central axis of the fulcrum shaft 46 is referred to as a first rotation axis Ax1. The arm assembly 42 is attached to the vehicle body frame 2 so as to be rotatable about the first rotation axis Ax1. The arm 45 is rotatable relative to the lift link 44 around a joint shaft 47. The working device 4 further includes a plurality of arm cylinders 48 and at least one equipment cylinder 49. Each of the plurality of arm cylinders 48 is connected to the vehicle body frame 2 and the arm 45 so as to be rotatable about a second rotation axis, and moves the lift link 44 and the arm 45 to move the lift link 44 and the arm 45 in a height direction D (described later). H 2. The at least one implement cylinder 49 is configured to raise and lower the arm assembly 42 and the bucket 41 in the vehicle body frame 2. The at least one implement cylinder 49 is configured to tilt the bucket 41. The cabin 5 is attached to the front of the vehicle body frame 2. The work vehicle 1 is provided with a window 5A in the front of the cabin 5, and a driver's seat 5B and an operating device (not shown) are provided inside the cabin 5. A cabin frame 5C shown in FIG. 1 which forms the outer shell of the cabin 5 is rotatable about rotational shafts RSL and RSR on the vehicle body frame 2 shown in FIG. 2. In FIGS. 1 and 2, a common rotational axis A defined by the rotation shafts RSL and RSR is XC is illustrated.

[0013] In the embodiment of the present application, FB (Forward direction D F / backward D B ) means the front-rear direction (front direction / rear direction) as seen from the operator seated in the driver's seat 5B of the cabin 5. W (Left direction D L / Right direction D R ) means the left and right directions (left and right directions) from the operator's point of view. H (Upward D U / Downward D D) means the height direction (upward / downward) as seen from the operator. The front-rear / left-right / up-down (height) directions of the work vehicle 1 respectively correspond to the front-rear / left-right / up-down (height) directions as seen from the operator. In other words, the vehicle body frame 2 is FB , anteroposterior direction D FB The left-right direction D perpendicular to W , and the front-rear direction D FB and left / right direction D W and the height direction D perpendicular to H has.

[0014] FIG. 1 shows the left side of the work vehicle 1. As shown in FIG. 2, the vehicle body frame 2 is generally symmetrical with respect to the vehicle body central plane M, and of the pair of arm assemblies 42, the arm assembly 42 provided on the left side with respect to the vehicle body central plane M is shown as the first arm assembly 42L, and the arm assembly 42 provided on the right side with respect to the vehicle body central plane M is shown as the second arm assembly 42R. The lift link 44 provided on the left side with respect to the vehicle body central plane M is shown as the first link 44L. The lift link 44 provided on the right side with respect to the vehicle body central plane M is shown as the second link 44R. The arm 45 provided on the left side with respect to the vehicle body central plane M is shown as the first arm 45L, and the arm 45 provided on the right side with respect to the vehicle body central plane M is shown as the second arm 45R. The fulcrum shaft 46 provided on the left side with respect to the vehicle body central plane M is shown as the first fulcrum shaft 46L, and the fulcrum shaft 46 provided on the right side with respect to the vehicle body central plane M is shown as the second fulcrum shaft 46R. The joint shaft 47 provided on the left side of the vehicle body central plane M is shown as a first joint shaft 47L, and the joint shaft 47 provided on the right side of the vehicle body central plane M is shown as a second joint shaft 47R.

[0015] 1 and 2, the work vehicle 1 further includes an engine 6 provided at the rear of the vehicle body frame 2. The engine 6 is configured to provide driving force to the traveling device 3 and the working device 4. The engine 6 rotates in the left-right direction D of the work vehicle 1. Wand is provided between the pair of arm assemblies 42. The work vehicle 1 further includes a bonnet cover 8 for covering the engine 6. The work vehicle 1 further includes a rear bonnet cover 9 provided at the rear end of the body frame 2. The rear bonnet cover 9 can be opened and closed, allowing a maintenance technician to perform maintenance work on the engine 6, etc.

[0016] 1, a hydraulic pump 7 that is driven by the engine 6 and supplies hydraulic oil is connected to the engine 6. The hydraulic pump 7 includes a traveling hydraulic pump that supplies hydraulic oil to a hydraulic motor that drives the drive wheels 31, and a working hydraulic pump that supplies hydraulic oil to a plurality of arm cylinders 48 and at least one implement cylinder 49.

[0017] FIG. 3 is an enlarged view of the arm cylinder 48 and its periphery as viewed from above. FIG. 3 illustrates the arm cylinder 48 provided on the left side of the vehicle body central plane M, but the structure around the arm cylinder 48 provided on the right side of the vehicle body central plane M is substantially symmetrical to the structure illustrated in FIG. 3 with respect to the vehicle body central plane M. In FIG. 3, for the sake of convenience in explaining the structure around the arm cylinder 48, the arm assembly 42 above the arm cylinder 48 is omitted. However, the fulcrum shaft 46 (first fulcrum shaft 46L) is illustrated by a two-dot chain line. Referring to FIG. 3, the first rotation axis Ax1 is oriented in the left-right direction D. W The second rotation axis Ax2 is substantially parallel to the first rotation axis Ax1. FIG. 4 is a cross-sectional view taken along the line IV-IV' in FIG. 3. FIG. 4 also shows the arm assembly 42 above the arm cylinder 48. FIG. 4 omits the illustration of the side plate 13.

[0018] 1, 3, and 4, the work vehicle 1 includes a front plate 11, a rear plate 12, a side plate 13, a lower plate 14, and a cover 15. The front plate 11 is disposed in the front-rear direction D of the arm cylinder 48. FB Front side D F The rear plate 12 is attached to the vehicle body frame 2 at the front-rear direction D of the arm cylinder 48. FB Rear side DB The side plate 13 is attached to the vehicle body frame 2 at the left-right direction D with respect to the arm cylinder 48. W The lower plate 14 is attached to the front plate 11 and the rear plate 12 on the opposite side of the arm cylinder 48 in the height direction D. H Underside D D The cover 15 is attached to the vehicle body frame 2 and the side plate 13 at the position indicated by arrows 11 and 12. The vehicle body frame 2, the front plate 11, the rear plate 12, the side plate 13, and the lower plate 14 surround the arm cylinder 48 and form an accommodation space for accommodating the arm cylinder 48. The cover 15 is located lower than the lower plate 14 in the height direction D. H Upper D U , the cover 15 is connected to the body frame 2, the front plate 11, the rear plate 12, and the side plate 13. The cover 15 has a through hole 15h through which the arm cylinder 48 passes. The through hole 15h has a shape and size that does not interfere with the movement of the arm cylinder 48. The cover 15 prevents dust from entering the accommodation space from above.

[0019] 4, the front plate 11 is in a reference direction D in which the arm cylinder 48 faces when the working tool (bucket 41) attached to the arm assembly 42 touches the ground. REF It extends along the front-rear direction D FB The first distance D1 between the second rotation axis Ax2 and the front plate 11 in the front-rear direction D FB The arm cylinder 48 is rotated in the reference direction D REF When facing the vertical direction D H A straight line formed by connecting the front ends (e.g., F1, F2) of the arm cylinder 48 corresponding to the heights of the arm cylinder 48 is defined as a reference direction D. REF The straight line extending along the reference direction D is defined as the first straight line L1. REF When the arm cylinder 48 is facing the reference direction D, a straight line formed by connecting a plurality of rear ends (for example, R1, R2) of the arm cylinder 48 corresponding to a plurality of heights is defined as a reference direction D. REFThe line extending along the line L1 is defined as the second line L2. REF and left / right direction D W The cylinder width direction D perpendicular to CW The minimum distance L MIN Therefore, the gap G between the arm cylinder 48 and the front plate 11 is easily clogged with dust that has entered through the through hole 15h. MIN is the cylinder width direction D CW Width W of arm cylinder 48 at C is shorter than.

[0020] However, the front-rear direction D of the lower plate 14 FB The front end 14t of the arm cylinder 48, the front plate 11, the side plate 13, and the body frame 2 form an opening AP below the arm cylinder 48. W When viewed from the side, the front end 14t of the lower plate 14 is aligned in the reference direction D REF and left / right direction D W The cylinder width direction D perpendicular to CW The lower plate 14 is located between the first straight line L1 and the second straight line L2 in the cylinder width direction D between the front end 14t of the lower plate 14 and the front plate 11. CW Distance L F is the cylinder width direction D between the front plate 11 and the first straight line L1 CW The minimum distance L MIN This allows dust trapped in the gap G to be easily discharged through the opening AP.

[0021] Further, referring to FIG. 4, the lower plate 14 is located at a position lower than the second rotation axis Ax2 in the height direction D H Below D D In the reference direction D REF The lower extension portion 14e extends along the left-right direction D. W When viewed from the side, the downward extending portion 14e is REF and left / right direction D W The cylinder width direction D perpendicular to CWThe downward extension 14e, the front plate 11, the side plate 13, and the body frame 2 are located below the arm cylinder 48. D An opening AP is formed in the cylinder width direction D between the downward extension portion 14e and the front plate 11. CW The minimum distance L F is the cylinder width direction D between the front plate 11 and the first straight line L1 CW The minimum distance L MIN This allows dust stuck in the gap G to be easily discharged from the opening AP. Furthermore, the opening AP is formed as a space surrounded by plates that are inclined backwards, so that the lower portion D of the opening AP is D This prevents shrubs, grass, etc. from entering through the storage space.

[0022] The lower plate 14 is detachable from the side plate 13 and the vehicle body frame 2. Specifically, the work vehicle 1 further includes a flat mounting plate 16 connected to the vehicle body frame 2. The lower plate 14 is configured to be mounted on the mounting plate 16. The mounting plate 16 is oriented in the front-rear direction D FB D in front of F Specifically, the mounting plate 16 is attached to the vehicle body frame 2 by welding, and the lower plate 14 is attached to the mounting plate 16 with a bolt B1. The work vehicle 1 may also be provided with a mounting plate similar to the mounting plate 16 connected to the side plate 13. This makes cleaning easy, since dust deposited on the lower plate 14 can be removed by removing the lower plate 14. Furthermore, the mounting plate 16 is inclined in the front-rear direction D FB D in front of F Since the lower plate 14 is inclined toward the mounting plate 16, dust on the mounting plate 16 is also removed when the lower plate 14 is removed, making cleaning easier. <Actions and Effects of the Embodiments>

[0023] In the work vehicle 1, the lower part D of the arm cylinder 48 D1, the arm cylinder 48 is provided with an opening AP formed by the downward extension 14e (the front end 14t of the lower plate 14), the front plate 11, the side plate 13, and the body frame 2. This prevents the arm cylinder 48 from being damaged, and allows the lower D D This prevents dust from entering through the opening. <Modification>

[0024] In the embodiment described above, the arm assembly 42 includes two members: the lift link 44 and the arm 45. However, the arm assembly 42 may be composed of only one member, or three or more links.

[0025] In this application, the term "comprises" and its derivatives are open-ended terms that describe the presence of elements and do not exclude the presence of other elements not listed. This also applies to the terms "have", "include" and their derivatives.

[0026] The terms "member," "part," "element," "body," and "structure" may have multiple meanings, such as a single part or multiple parts.

[0027] Ordinal numbers such as "first" and "second" are merely terms used to identify components and do not have any other meaning (such as a particular order). For example, the presence of a "first element" does not imply the presence of a "second element," and the presence of a "second element" does not imply the presence of a "first element."

[0028] Words expressing degree, such as "substantially," "about," and "approximately," may mean a reasonable deviation that does not significantly change the final result, unless otherwise specified in the embodiment. All numerical values ​​described in this application may be interpreted to include words such as "substantially," "about," and "approximately."

[0029] In this application, the phrase "at least one of A and B" should be interpreted as including A only, B only, and both A and B.

[0030] It is apparent that various changes and modifications of the present invention are possible in light of the above disclosure, and therefore, the present invention may be practiced otherwise than as specifically disclosed herein without departing from the spirit and scope of the present invention.

Claims

1. a vehicle body frame having a front-rear direction, a left-right direction perpendicular to the front-rear direction, and a height direction perpendicular to the front-rear direction and the left-right direction; an arm assembly attached to the vehicle body frame so as to be rotatable about a first rotation axis extending in the left-right direction; an arm cylinder attached to the vehicle body frame so as to be rotatable about a second rotation axis substantially parallel to the first rotation axis, and configured to control the elevation and lowering of the arm assembly in the height direction; a front plate attached to the vehicle body frame at a front side of the arm cylinder in the front-rear direction; a rear plate attached to the vehicle body frame on a rear side of the arm cylinder in the front-rear direction; a side plate attached to the front plate and the rear plate on the opposite side of the arm cylinder from the vehicle body frame in the left-right direction; a lower plate attached to the vehicle body frame and the side plate at a lower side of the arm cylinder in the height direction; Equipped with the vehicle body frame, the front plate, the rear plate, and the side plate surround the arm cylinder, the front plate extends along a reference direction in which an arm cylinder faces when a work tool attached to the arm assembly is grounded; the lower plate has a downward extension portion extending along the reference direction below the second rotation shaft in the height direction, the downward extension portion, the front plate, the side plate, and the vehicle body frame form an opening below the arm cylinder; Work vehicle.

2. When the arm cylinder faces the reference direction, a straight line formed by connecting a plurality of front ends of the arm cylinder corresponding to a plurality of heights in the height direction is extended along the reference direction to define a first straight line, When the arm cylinder is facing the reference direction, a straight line formed by connecting the multiple rear ends of the arm cylinder corresponding to the multiple heights is extended along the reference direction to define a second straight line, When viewed in the left-right direction, the downward extension portion is located between the first straight line and the second straight line in a cylinder width direction perpendicular to the reference direction and the left-right direction. A work vehicle according to claim 1.

3. a vehicle body frame having a front-rear direction, a left-right direction perpendicular to the front-rear direction, and a height direction perpendicular to the front-rear direction and the left-right direction; an arm assembly attached to the vehicle body frame so as to be rotatable about a first rotation axis extending in the left-right direction; an arm cylinder attached to the vehicle body frame so as to be rotatable about a second rotation axis substantially parallel to the first rotation axis, and configured to control the elevation and lowering of the arm assembly in the height direction; a front plate attached to the vehicle body frame at a front side of the arm cylinder in the front-rear direction; a rear plate attached to the vehicle body frame on a rear side of the arm cylinder in the front-rear direction; a side plate attached to the front plate and the rear plate on the opposite side of the arm cylinder from the vehicle body frame in the left-right direction; a lower plate attached to the vehicle body frame and the side plate at a lower side of the arm cylinder in the height direction; Equipped with the vehicle body frame, the front plate, the rear plate, and the side plate surround the arm cylinder, the front plate extends along a reference direction in which an arm cylinder faces when a work tool attached to the arm assembly is grounded; When the arm cylinder faces the reference direction, a straight line formed by connecting a plurality of front ends of the arm cylinder corresponding to a plurality of heights in the height direction is extended along the reference direction to define a first straight line, When the arm cylinder is facing the reference direction, a straight line formed by connecting the multiple rear ends of the arm cylinder corresponding to the multiple heights is extended along the reference direction to define a second straight line, When viewed in the left-right direction, a front end of the lower plate in the front-rear direction is located between the first straight line and the second straight line in a cylinder width direction perpendicular to the reference direction and the left-right direction, the front end of the lower plate, the front plate, the side plate, and the vehicle body frame form an opening below the arm cylinder; Work vehicle.

4. a first distance between the second rotation shaft and the front plate in the front-rear direction is shorter than a second distance between the second rotation shaft and the rear plate in the front-rear direction; A work vehicle according to claim 1.

5. a first distance between the second rotation shaft and the front plate in the front-rear direction is shorter than a second distance between the second rotation shaft and the rear plate in the front-rear direction; The work vehicle according to claim 2.

6. a first distance between the second rotation shaft and the front plate in the front-rear direction is shorter than a second distance between the second rotation shaft and the rear plate in the front-rear direction; A work vehicle according to claim 3.

7. A minimum distance between the front plate and the first straight line in the cylinder width direction is shorter than a width of the arm cylinder in the cylinder width direction. The work vehicle according to claim 2.

8. A minimum distance between the front plate and the first straight line in the cylinder width direction is shorter than a width of the arm cylinder in the cylinder width direction. A work vehicle according to claim 3.

9. A minimum distance between the downward extension portion and the front plate in the cylinder width direction is longer than the minimum distance between the front plate and the first straight line in the cylinder width direction. A work vehicle according to claim 7.

10. A distance between a front end of the lower plate and the front plate in the cylinder width direction is longer than the minimum distance between the front plate and the first straight line in the cylinder width direction. A work vehicle according to claim 8.

11. The work vehicle according to claim 1 , wherein the lower plate is detachable from the side plate and the vehicle body frame.

12. A flat mounting plate connected to the vehicle body frame is further provided. the lower plate is configured to be attached to the mounting plate; The mounting plate is inclined forward in the front-rear direction. A work vehicle according to claim 11.

13. a cover connected to the body frame, the front plate, the rear plate, and the side plate above the lower plate in the height direction; The cover has a through hole through which the arm cylinder passes. A work vehicle according to any one of claims 1 to 12.

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