JP4711867B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle in which work machines such as a front loader and a backhoe are attached to a tractor vehicle body via a pair of left and right work machine mounting frames.

A work vehicle in which a pair of left and right work implement mounting frames are arranged in the front-rear direction on both the left and right sides of the tractor vehicle body, and the work machine is attached to the tractor vehicle body via the pair of work device installation frames, for example, in front of the tractor There is a work vehicle called TLB with a front loader attached to the rear part and a backhoe attached to the rear part. This type of conventional work vehicle has a structure in which the rear part of the pair of left and right work implement attachment frames is sandwiched from above and below the rear axle case. The rear part of the pair of left and right work implement mounting frames is attached to the tractor vehicle body via the bracket (for example, Patent Document 1 and Patent Document 2).
JP 2005-16023 A JP 2004-114762 A

Therefore, in the conventional case, in order to fix the rear part of the work implement mounting frame to the tractor body, a bracket having a structure for sandwiching the rear axle case is separately required, and the structure for fixing the rear part of the work equipment frame to the tractor body is complicated. Therefore, the work of attaching the work equipment mounting frame to the tractor body is troublesome and the cost is increased.
In view of the above problems, the present invention can easily attach a work implement mounting frame to a tractor vehicle body and manufacture a work vehicle at low cost.

The technical means of the present invention for solving this technical problem is that a driver's seat is provided between a pair of left and right rear wheel fenders that covers the inside of a pair of left and right rear wheels, and a pair of left and right provided on the left and right of the driver seat A protective frame having a support of
In a work vehicle in which a pair of left and right work implement mounting frames are disposed in the front-rear direction on both the left and right sides of the tractor vehicle body, and the work machine is attached to the tractor vehicle body via the pair of work machine attachment frames,
Rear left and right pair of work machine mounting frame is fixed directly to the rear axle case by concluding fixture such as bolts,
The lower portions of the pair of support posts of the protective frame are respectively arranged behind the rear axle case and inward in the left-right direction than the rear part of the pair of left and right work implement mounting frames, and fixed to the transmission case.
A connecting member is interposed between a rear side of the left and right work implement mounting frame fixed to the rear axle case and a lower portion of the left and right support columns, and the outer side of the connecting member is the work implement mounting frame. It is fixed to the rear end portion by a fastener such as a bolt , and the inner end portion side of the connecting member is fixed to the lower portion of the support column of the protective frame by a fastener such as a bolt .

Another technical means of the present invention, the mounting frame is provided comprising a left right pair of side frame portions and the upper frame portion, the mounting frame is fixed to the transmission case by a fastener, the attachment The lower part of the column is fixed to the frame by welding .

  Another technical means of the present invention is that a connecting member is disposed in the left-right direction below the transmission case, and the rear ends of the pair of left and right work implement mounting frames are connected by the connecting member. .

  According to the present invention, when the rear portion of the work implement mounting frame is fixed to the tractor vehicle body, a bracket having a structure for sandwiching the rear axle case as in the prior art becomes unnecessary, and the rear portion of the work implement frame is fixed to the tractor vehicle body. Since the structure becomes simple, the work of attaching the work equipment mounting frame to the tractor body becomes easy, and the work vehicle can be manufactured at low cost.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2, reference numeral 1 denotes a work vehicle referred to as a TLB. The work vehicle 1 is configured such that a front loader 3 can be attached to a front portion of a tractor 2 and a backhoe 4 can be attached to a rear portion thereof.
The tractor vehicle body 2A of the tractor 2 includes a front engine, a clutch housing 9 connected to the rear part of the engine via a flywheel housing and the like, a transmission case 10 connected to the rear of the clutch housing 9, and the like. And is supported by a pair of left and right front and rear wheels 7 and 8 so as to be able to travel.

A front axle frame 11 extending forward from the engine is attached and fixed to the lower left and right side surfaces of the engine with bolts, and a battery, a radiator, a fuel tank, and the like are supported on the front axle frame 11, and the engine, battery, and radiator are supported. The fuel tank is covered with a bonnet 12.
A rear wheel fender 13 that covers the inside of the rear wheel 8 is provided on the left and right sides of the rear portion of the tractor vehicle body 2A, and a driver seat 14 is provided between the left and right rear wheel fenders 13. A steering handle 15 is provided in front of the driver seat 14. In addition, the tractor body 2A is provided with a four-post type lops 5 as a protective frame surrounding the driver's seat 14 and the steering handle 15. The lops (protection frame) 5 includes a pair of left and right front columns 5 a and a pair of left and right rear columns 6. It should be noted that a canopy or the like may be used as the protective frame instead of the lops 5.

A floor seat 19 is provided in a protruding manner between the front lower ends of the pair of rear wheel fenders 13, and the floor seat 19 is disposed below the steering handle 15 and the driver seat 14.
Work implement mounting frames 16 for mounting the front loader 3 and the backhoe 4 to the tractor 2 are arranged in the front-rear direction on both the left and right sides of the tractor vehicle body 2A. As will be described later, the left and right work implement mounting frames 16 are connected to each other. In addition, the front part is fixed to the rear part of the front axle frame 11 and the rear part is fixed to the rear axle case 17 of the rear part of the transmission case 10. A pair of left and right rear axle cases 17 are provided at the rear of the transmission case 10, and each rear axle case 17 has a protruding shaft portion 17a protruding outward in the left-right direction.

In addition, a loader mounting member 18 is fixed to the front portion of each of the left and right work implement mounting frames 16 so as to protrude upward.
The front loader 3 is detachably attached to the left and right loader attachment members 18. The front loader 3 is pivotally connected to the upper portion of the loader mounting member 18 so as to be pivotable about a left-right axis, and is rotatable about a left-right axis on the front end side of the left-right boom 20. And a pivotally connected bucket 21.

The boom 20 is vertically swung by the expansion and contraction of the boom cylinder 22 interposed between the loader mounting member 18 and the boom 20, and the bucket 21 is connected to the bucket cylinder 23 interposed between the boom 20 and the bucket 21. Squeeze dump operation by expansion and contraction.
The backhoe 4 includes a base 24 that is detachably attached to the rear part of the left and right work implement mounting frames 16, a pair of left and right attachment bodies 34 that are fixed to the front part of the base 24, and a vertical axis that is attached to the rear part of the base 24. A swing bracket 25 supported so as to be swingable left and right, a boom 26 pivotally connected to a lower side of the swing bracket 25 about a horizontal axis, and a front end side of the boom 26. The arm 27 is pivotally connected to the left and right axial centers, the bucket 28 is pivotally connected to the distal end side of the arm 27, and the left and right sides of the base 24. And an outrigger (not shown).

The swing bracket 25 is swung left and right by expansion and contraction of a pair of left and right swing cylinders 30 interposed between the base 24 and the swing bracket 25, and the boom 26 is interposed between the swing bracket 25 and the boom 26. The boom 27 is swung up and down by the expansion and contraction of the boom cylinder 31, and the arm 27 is swung up and down by the expansion and contraction of the arm cylinder 32 interposed between the boom 26 and the arm 27. Squeezing and dumping is performed by the expansion and contraction of the bucket cylinder 33 interposed between the left and right outriggers, and the left and right outriggers are vertically swung by a pair of left and right outrigger cylinders interposed between the outrigger and the base 24, respectively. .

  At the rear part of the tractor vehicle body 2A, a three-point link 36 consisting of one top link (not shown) arranged at the center in the left-right direction and a pair of lower left and right lower links 35 can be mounted. In a state where 4 is removed, a rear working machine such as a box scraper (a leveling work machine), a rotary tiller or the like can be mounted on the rear part of the tractor vehicle body 2A via the three-point link 36 so as to be movable up and down.

At the rear of the tractor vehicle body 2A, a hydraulic lifting device 39 is provided for swinging the lower link 35 of the three-point link 36 up and down to raise and lower the rear working machine. The hydraulic lifting device 39 is used for lifting the working machine. A hydraulic cylinder 40 is provided, and the hydraulic cylinder 40 has a pair of left and right lift arms 48.
The front end side (rear part) of each lift arm 48 is connected to the lower link 35 on the same side in the left-right direction via a lift rod 49, and when the lift arm 48 swings upward, the left and right lift rods 49 are pulled up. The left and right lower link 35 swings upward, and the rear work machine attached to the three-point link 36 is thereby raised.

As shown in FIGS. 1 and 2, a loader control valve 37 is provided on the inner side in the left-right direction of the pair of rear wheel fenders 13, and the spool portion of the loader control valve 37 is operated on the right side of the driver's seat 14. A control lever 50 is provided.
3 to 7, the left and right work implement mounting frames 16 are formed of a single plate material, and the front of each left and right work implement mounting frame 16 is a support base made of a cylindrical body having a horizontal axis. 53 is penetrated in the left-right direction and fixed by welding, and the front portions of the left and right work implement mounting frames 16 are connected to each other by the support base 53. A mounting bracket 54 is fixed to the front side and the upper side of each of the left and right support bases 53 by welding or the like so as to protrude forward and upward.

The front portion of the mounting bracket 54 is disposed on the outer side surface of the front axle frame 11 in the left-right direction, and is fixed to the front axle frame 11 by bolts or the like.
Also, a pair of left and right loader mounting members 18 for detachably mounting the front loader 3 are provided at the front portions of the left and right work implement mounting frames 16. As shown in FIG. 8, each of the left and right loader mounting members 18 is formed in an open U-shape forward in plan view from a pair of left and right side walls 18a and a back wall 18b connecting the back side edges of the left and right side walls 18a. The main composition is.

The loader mounting member 18 is disposed on both the left and right sides of the engine and on the outer side in the left and right direction of the front portion of the work implement mounting frame 16, and the outer side in the left and right direction of the support base 53 penetrates the lower end side of the left and right side walls 18a. At the same time, the left and right side walls 18 a are fixed to the support base 53 by welding or the like, and the loader mounting member 18 is fixed to the support base 53 so as to protrude upward.
The lower end side of the front strut 5a of the lops 5 is inserted into the upper end portion of the loader mounting member 18, and is fixedly attached by pins or bolts.

A reinforcing plate 55 is provided between the left and right side walls 18a of the loader mounting member 18 from the upper part to the lower part.
A backhoe attachment portion (work implement attachment portion) 61 for detachably attaching the backhoe 4 is provided at the rear end of each of the left and right work implement attachment frames 16.
The backhoe mounting portion 61 includes a connecting portion 62 provided on the rear end upper side of the work implement mounting frame 16 and a receiving member 63 provided in a rear projecting manner on the rear end lower portion of the work implement mounting frame 16. .

As shown in FIG. 7, a connected portion 64 provided on the upper portion of the attachment body 34 of the backhoe 4 is connected to the connecting portion 62 by a connecting pin 65 penetrating the connecting portion 62 and the connected portion 64 in the left-right direction. ing.
The receiving member 63 is fixed to the inner surface of the work machine mounting frame 16 by welding or the like, and the receiving member 63 is formed with a concave portion 66 that is open upward. The concave portion 66 has a shape as shown in FIG. A connecting bar 67 provided in the lower part of the attachment body 34 of the backhoe 4 is fitted.

The connecting bar 67 is provided in the left-right direction across the left and right mounting bodies 34 of the backhoe 4, and both left and right end portions of the connecting bar 67 protrude outward from the mounting body 34 in the left-right direction. A portion of the connecting bar 67 that protrudes outward in the left-right direction from the attachment body 34 is fitted into the recess 66 of the receiving member 63.
In the mounting structure of the backhoe 4 having the above-described configuration, in order to remove the backhoe 4 from the work implement mounting frame 16, the connecting pin 65 is connected to the connecting portion 62 and the connected portion 64 with the legs of the outrigger and the bucket 28 grounded. In this state, the arm 27, the bucket 28, the boom 26, etc. are operated to swing the mounting body 34 around the axial center of the connecting bar 67, and then the outriggers are operated to mount it. The body 34 is raised to disengage the connecting bar 67 upward from the recess 66, and in this state, the tractor 2 is moved forward.

Further, in the middle in the vertical direction on the rear end side of the work machine mounting frame 16, the side of the backhoe 4 that protrudes rearward so as to be positioned above the recess 66 in a side view and fits into the recess 66. A restricting portion 68 that restricts the upward movement of the connecting bar 67 is formed.
A connecting member 71 is disposed in the left-right direction below the mission case 10, and the rear ends of the pair of left and right work implement mounting frames 16 are connected by the connecting member 71. A notch recess 73 through which the protruding shaft portion 17 a of the rear axle case 17 is inserted is provided at the rear portion of the work implement mounting frame 16. The notch recess 73 is open on the upper side, and is fitted into the protruding shaft portion 17a of the rear axle case 17 from below, and the peripheral edge of the notch recess 73 is fixed to the rear axle case 17 with a fastener 74 such as a bolt. Thus, the rear portions of the pair of left and right work implement mounting frames 16 are directly fixed to the rear axle case 17 by fasteners 74 such as bolts. Note that the notch recess 73 may be formed in a notch shape having an opening on the lower side, and may be fitted to the protruding shaft portion 17a of the rear axle case 17 from above.

  4 and 5, the pair of left and right rear struts 6 of the lops 5 includes an upper strut portion 6a and a lower strut portion 6b as separate bodies, and the upper strut portion 6a and the lower strut portion 6b are connected by a connecting cylinder 70. The lower part of the rear strut 6, that is, the lower strut part 6 b, passes through the rear end part of the rear wheel fuser 13 in the vertical direction and is bent inward in the left-right direction so as to be behind the rear axle case 17. Thus, it is disposed inward in the left-right direction from the rear part of the pair of left and right work implement mounting frames 16. As shown also in FIG. 9, the attachment plate 72 is fixed to the outer side of the lower end portion of the lower column portion 6b so as to protrude downward by welding.

  A mounting frame 75 is provided so as to surround the upper surface and both outer surfaces of the mission case 10, and the mounting frame 75 is fixed to the mission case 10 by a fastener 76 such as a bolt, and the rear column 6 (lower column part 6b). Are fixed to the pair of left and right side frame portions 75a of the attachment frame body 75 by welding, and the lower portion of the rear support column 6 (lower support column portion 6b) is connected to the upper frame portion 75b of the attachment frame body 75. It is fixed by welding via. Accordingly, the lower portions of the pair of rear struts 6 (lower strut portions 6 b) are fixed to the transmission case 10 via the attachment frame bodies 75.

  As shown also in FIG. 9, a pair of left and right connecting members 77 are interposed between the rear end portions of the pair of left and right work implement mounting frames 16 and the lower portion of the rear strut 6 (lower strut portion 6b) of the lops 5. Each connecting member 77 has a pair of left and right side plates 77a and a plurality of connecting plates 77b that connect the pair of side plates 77a. The outer side of the connecting member 77 is a bolt or the like at the rear end of the work implement mounting frame 16. It is fixed by a fastener 78, and the inner end side of the connecting member 77 is fixed to the lower portion of the rear strut 6 of the rope 5 by a fastener 79 such as a bolt, whereby the rear axle case 17 of the pair of work implement mounting frames 16 is secured. The rear side of the fixed portion is connected to the lower part of the pair of rear struts 6a via connecting members 77, respectively.

  According to the above embodiment, the rear portions of the pair of left and right work implement mounting frames 16 are directly fixed to the rear axle case 17 by the fasteners 74 such as bolts, so that the conventional rear axle case is sandwiched. Since the bracket is not required and the structure for fixing the rear portion of the work machine frame 16 to the tractor vehicle body 2A is simplified, the work for attaching the work machine mounting frame 16 to the tractor vehicle body 2A is simplified, and the work vehicle 2A is inexpensive. Will be able to be manufactured.

  In addition, a notch recess 73 is provided in the rear portion of the work implement mounting frame 16 so as to pass through the protruding shaft portion 17a of the rear axle case 17, and the peripheral edge portion of the notch recess 73 is fixed to the rear axle case 17 with a fastener 74 such as a bolt. Therefore, the work shaft is not disturbed by the projecting shaft portion 17a, and the rear portion of the work machine mounting frame 16 is brought into contact with or close to the outer end surface of the rear axle case 17, and the work device mounting frame is fastened by the fastener 74. The rear part of 16 can be fixed reliably and firmly.

  Further, the lower part of the pair of left and right rear struts 6 of the protective frame 5 is disposed behind the rear axle case 17 and inward in the left and right direction from the rear part of the pair of left and right work implement mounting frames 16, respectively. 10 and the rear side of the pair of work implement mounting frames 16 fixed to the rear axle case 17 is connected to the lower part of the pair of rear struts 6. The protective frame 5 can be integrated and the pair of left and right work implement mounting frames 16 can be effectively reinforced by the protection frame 5 and the protection frame 5 can be reinforced by the pair of left and right work implement mounting frames 16. .

  Further, a support base 53 is penetrated in the left-right direction and fixed by welding to the front part of the pair of left and right work implement mounting frames 16, and the front parts of the left and right work implement mounting frames 16 are connected to each other by the support base 53. A pair of left and right loader mounting members 18 for detachably mounting the front loader 3 are provided, and the left and right loader mounting members 18 are fixed to the left and right end portions of the support base 53 by welding so as to protrude upward. The pair of left and right work implement mounting frames 16, the support base 53, and the left and right loader mounting members 18 are integrated by welding, and the front side (loader mounting portion) of the pair of left and right work implement mounting frames 16 is made strong. be able to. Moreover, when the loader mounting member is bolted to the pair of left and right work implement mounting frames as in the prior art, the structure is complicated and the number of components increases, and the loader mounting member is assembled to the work implement mounting frame side. The work is troublesome, and loosening of the bolts causes problems such as rattling of the loader mounting member. However, in this embodiment, such problems do not occur, and the pair of left and right work implement mounting frames 16 are eliminated. The front side (loader mounting portion) can be made to have a strong structure, and at the same time, the work of assembling the loader mounting member 18 to the work machine mounting frame 16 side is simple, and the manufacturing cost of the work vehicle is reduced.

It is a side view of the work vehicle which shows one Embodiment of this invention. It is a rear view of the work vehicle. It is a top view of the tractor vehicle body and a work implement mounting frame part. It is a side view of the tractor vehicle body and work implement mounting frame. It is a rear view of the tractor vehicle body and work implement mounting frame. It is a top view of the working machine mounting frame part. It is a side view of the working machine mounting frame part. It is a front view of the loader attachment member. It is a rear view of the lower part of the back support | pillar, a working machine mounting frame, and a connection member part.

DESCRIPTION OF SYMBOLS 2 Tractor 2A Car body 3 Front loader 4 Backhoe 5 Ropps 10 Mission case 13 Rear wheel fender 14 Driver's seat 16 Work implement mounting frame 17 Rear axle frame 71 Connecting member 73 Notch recessed part 74 Fastening tool 75 Mounting frame body 75a Side frame part 76 Fastening tool 77 Fastener

Claims (3)

A driver's seat (14) is provided between a pair of left and right rear wheel fenders (13) covering the inside of the pair of left and right rear wheels (8), and a pair of left and right columns (6) provided on the left and right of the driver seat (14). A protective frame (5) having
A pair of left and right work implement mounting frames (16) are arranged on the left and right sides of the tractor vehicle body (2A) in the front-rear direction, and the work machines are attached to the tractor vehicle body (2A) via the pair of work device installation frames (16). In the work vehicle
The rear portions of the pair of left and right work implement mounting frames (16) are directly fixed to the rear axle case (17) by fasteners (74) such as bolts ,
The lower portions of the pair of support posts (6) of the protective frame (5) are respectively arranged behind the rear axle case (17) and inward in the left-right direction than the rear portions of the pair of left and right work implement mounting frames (16). And fixed to the mission case (10),
Connection members (77) are interposed between the rear side of the left and right work implement mounting frames (16) and the lower portions of the left and right support columns (6), respectively, with respect to the rear axle case (17). The outer side of the connecting member (77) is fixed to the rear end of the work implement mounting frame (16) by a fastener (78) such as a bolt , and the inner end of the connecting member (77) is a protective frame (5). ) Is fixed to a lower portion of the support column (6) by a fastener (79) such as a bolt . An attachment frame (75) comprising a pair of left and right side frame portions (75a) and an upper frame portion (75b) is provided, and the attachment frame (75) is connected to the transmission case (10) by a fastener (76). It is secured to, the mounting frame (75), the work vehicle according to claim 1, wherein the lower portion of the strut (6) is characterized in that it is fixed by welding. A connecting member (71) is arranged in the left-right direction below the transmission case (10), and the rear ends of the pair of left and right work implement mounting frames (16) are connected by the connecting member (71). The work vehicle according to claim 1 or 2 .

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