JP2006333822A - Tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tractor in which the stiffness of portions for attaching a draw bar support, a pair of right and left lowering pins and a pair of right and left cylinder-supporting pins is strengthened to tightly and strongly attach them to the rear portion of the tractor body. <P>SOLUTION: This tractor in which a pair of right and left lifting or lowering cylinders, a pair of right and left lowering links and a draw bar support are disposed on the rear portion of the tractor body is characterized by disposing a pair of right and left side frames on both the sides of the rear portion of the tractor body, disposing the draw bar support to connect a pair of the light and left side frames to the right and left sides of the support, thus forming an attaching frame, and providing lower link pins for vertically swingably supporting the base end sides of a pair of the right and left lowering links and cylinder-supporting pins for longitudinally swingably supporting the lower end sides of a pair of the right and left lifting or lowering cylinders to the attaching frame. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tractor.

The tractor is provided with a pair of left and right lifting cylinders for lifting the pair of left and right lift arms on both sides of the rear part of the tractor body, and a pair of left and right lower links are supported so as to swing up and down. Some of the conventional tractors of this type are provided with a drawbar support on the lower end side, and a pair of left and right supports the drawbar support and the base end side of the lower link at the rear of the tractor body so as to be swingable up and down. The lower link pin and a pair of left and right cylinder support pins that support the lower end side of the elevating cylinder so as to be swingable back and forth are separately attached via a bracket or the like (Patent Document 1).
JP 2002-204604 A JP 09-109710 A

Therefore, conventionally, since the draw bar support, the pair of left and right lower link pins, and the pair of left and right cylinder support pins are separately mounted, the rigidity of these mounting portions at the rear of the tractor vehicle body becomes weak, and the draw bar support together with the brackets and the like. There was a risk that the body, the lower link pin, and the cylinder support pin would rattle.
In view of the above problems, the present invention increases the rigidity of the mounting portions of the draw bar support, the pair of left and right lower link pins, and the pair of left and right cylinder support pins, and attaches them firmly to the rear of the tractor body without fear of rattling. It is something that can be done.

The technical means of the present invention for solving this technical problem includes a pair of left and right lifting cylinders for lifting the pair of left and right lift arms on both sides of the rear portion of the tractor vehicle body, In a tractor in which a pair of lower links are supported so as to freely swing up and down, and a draw bar support is provided on the lower end side of the rear part of the tractor
A pair of left and right side frames are provided on both sides of the rear portion of the tractor vehicle body, and the draw bar support is provided so as to connect the pair of left and right side frames to the left and right to support the pair of side frames and the draw bar. A mounting frame is configured by the body,
The attachment frame is provided with a lower link pin that supports the base end side of the pair of left and right lower links so as to be swingable up and down, and a cylinder support pin that supports the lower end side of the pair of left and right lift cylinders so as to be swingable back and forth. There is in point.

Another technical means of the present invention is that a reinforcing plate is provided on the outer surface of the pair of left and right side frames, and the cylinder support pin is supported by the side frame and the reinforcing plate. .
Another technical means of the present invention is that the draw bar support is attached to a pair of left and right side frames and a tractor vehicle body.
According to another technical means of the present invention, a pair of left and right outer frame bodies are fixed to a rear axle case on the outer side of the pair of left and right side frame bodies, and the side frame body, the outer frame body, The cylinder support pin is connected and fixed between the two.

  According to another technical means of the present invention, a reinforcing plate is provided outside the draw bar support, and the reinforcing plate is fixed to the draw bar support and is fixed to the tractor vehicle body, and the lower link pin is It exists in the point supported by the rover support body and the reinforcement board.

  According to the present invention, the mounting frame constituted by the pair of side frame bodies and the draw bar support body can increase the rigidity of the mounting portions of the draw bar support body, the pair of left and right lower link pins, and the pair of left and right cylinder support pins. In addition, the draw bar support, the pair of left and right lower link pins, and the pair of left and right cylinder support pins can be firmly attached to the rear portion of the tractor vehicle body without fear of rattling.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6, reference numeral 1 denotes a tractor vehicle body, and a rear portion thereof is constituted by a mission case 1a. On the upper surface side of the rear portion (transmission case 1a) of the tractor vehicle body 1, there is provided an attachment body 2 attached so as to cover an opening formed on the upper surface of the mission case 1a.
The tractor body 1 is mainly composed of a front engine, a clutch housing connected to the rear part of the engine via a flywheel housing, and a transmission case 1a connected to the rear part of the clutch housing.

A pair of left and right rear axle cases 3 project outward from the left and right sides of the rear portion of the tractor vehicle body 1, and a pair of left and right rear wheels 5 are attached via the rear axle case 3.
A bracket attachment portion 9 for attaching the top link attachment bracket 8 is provided at the rear portion of the attachment body 2, and the bracket attachment portion 9 has a top via a torsion bar (load detection means) 10 having a horizontal axis. A link mounting bracket 8 is mounted, and one end side (tractor side) of the top link of the three-point link mechanism 13 is selectively pivotally connected to one of the mounting holes 11 provided in the top link mounting bracket 8.

A pair of left and right side frames 16 are provided on both sides of the rear portion of the tractor vehicle body 1, and a draw bar support body 17 is provided so as to connect the lower ends of the pair of left and right side frames 16 to the left and right. The side frame body 16 and the drawbar support body 17 constitute a gate-shaped mounting frame 18. The side frame 16 is formed in a plate shape that is long in the vertical direction, and the drawbar support 17 is formed in a U shape having an upper wall 19 and a pair of left and right side walls 20 bent downward from the left and right ends of the upper wall 19. ing.
The pair of left and right side frames 16 are fixed to the outer surface of the mission case 1a or the rear axle case 3 by fixing members 21, 22 such as bolts. The lower ends of the pair of left and right side frames 18 and the rear side of the side wall 20 of the draw bar support 17 are connected and fixed by a fastener 24 such as a bolt and nut. The front end portion of the draw bar support 17 is in contact with the lower surface of the mission case 1a from below, and is fastened and fixed to the lower surface of the mission case 1a by a fastener 25 such as a bolt.

A reinforcing plate 27 is provided on the outer surface of each side frame 16. The reinforcing plate 27 is fastened and fixed to the outer surface of the transmission case 1 a together with the side frame 16 by the fixing tool 22. A pair of left and right outer frame bodies 29 are provided on the outer sides of the pair of left and right side frame bodies 16, and each outer frame body 29 is fastened and fixed to the rear axle case 3 or the like by a fastening tool 30 such as a bolt.
A cylinder support pin 31 protrudes outwardly from the pair of left and right side frame bodies 16, and an inner end in the left-right direction of the cylinder support pin 31 is inserted through the side frame body 16 and is inserted through the reinforcing plate 27. The reinforcing plate 27 supports the inner end portion of the cylinder support pin 31 together with the side frame body 16 to reinforce the side frame body 16. The outer end of the cylinder support pin 31 in the left-right direction is inserted into the outer frame body 29, and the cylinder support pin 31 is fixed to the outer frame body 29 via a mounting plate 32 fixed to the cylinder support pin 31 by welding or the like. . Therefore, the cylinder support pin 31 is connected and fixed between the side frame 18 and the outer frame 29.

  A pair of left and right reinforcing plates 35 are provided on the front side of the pair of side walls 20 of the draw bar support 17. The reinforcing plates 35 are fastened and fixed to the side walls 20 of the draw bar support 17 by fasteners 36 such as bolts. It is fastened and fixed to the side surface of the mission case 1 a or the rear axle case 3 by a fastener 37 such as a bolt. A lower link pin 39 protrudes outward from the side wall 20 of the draw bar support 17, and an inner end in the left-right direction of the lower link pin 39 is inserted through the side wall 20 of the draw bar support 17 and through the reinforcing plate 35. The reinforcing plate 35 supports the inner end portion of the lower link pin 39 together with the side frame body 16 to reinforce the draw bar support body 17. Accordingly, the draw bar support 17 is fixed to the lower surface of the transmission case 1a by the fastener 25 and is fixed to the transmission case 1a or the rear axle case 3 via the reinforcing plate 35.

Thus, the mounting frame 18 supports the lower link pin 39 that supports the base end side of the pair of left and right lower links 41 so as to be swingable up and down, and the lower end side of the pair of left and right lift cylinders 42 so as to swing back and forth. Cylinder support pins 31 are respectively provided, and a pair of left and right lower link pins 39 and a pair of left and right cylinder support pins 31 protrude from the mounting frame 18 outward in the left-right direction.
The pair of left and right lower links 41 constitute the three-point link mechanism 13 together with the top link, and one end side (tractor side) of the pair of left and right lower links 41 is connected to a pair of lower link pins 39 via a ball joint 45. Are supported so as to be swingable up and down. The other end side (working machine side) of the top link and the left and right lower links 41 is pivotally connected to a frame of a working machine such as a plow, and the working machine is raised and lowered to the rear part of the tractor vehicle body 1 via a three-point link mechanism 13. Can be installed freely.

A pair of swing restricting members 44 are provided on the outer sides of the pair of lower links 41 in the left-right direction. The swing restricting members 44 are configured to be adjustable, and the front end of the swing restricting member 44 is connected to the rear axle case 3. The rear end portion is connected to the middle portion of the lower link 41, and each swing restricting member 44 restricts the left and right swing of each lower link 41.
Reference numeral 46 denotes a protective cover that covers and protects a PTO shaft (not shown) protruding rearward from the rear end of the tractor vehicle body 1 from the rear side, and is supported by the tractor vehicle body 1 so as to be able to be flipped up.

Lift arm pivots 47 are provided in the front-rear middle portions of the left and right side surfaces of the mounting body 2, and the bases of the lift arms 48 are rotatable about the left and right axial centers on the left and right lift arm pivots 47. One end side of the lift rod 49 is pivotally connected to the distal end side of the left and right lift arms 48, and the other end side of each of the left and right lift rods 49 is pivotally connected to the middle portion in the longitudinal direction of the lower link 41.
A pair of left and right lifting cylinders 42 are disposed on the rear side of the mission case 1, and one end side (upper end side, piston rod) of the left and right lifting cylinders 42 is pivotally connected to a middle portion of the left and right lift arms 48. The other end side (lower end side, piston top side of the cylinder body) of the cylinder 42 is supported by the cylinder support pin 31 so as to be swingable back and forth.

By extending and retracting the left and right lifting cylinder 42 (projecting and retracting the piston rod), the left and right lift arms 48 swing up and down around the rotation axis, and the left and right lift arms 48 swing up and down. The left and right lower links 41 swing up and down around the pivot on the tractor side, so that the work implement moves up and down.
The elevating cylinder 42 is constituted by a single-acting hydraulic cylinder, and pressure oil is supplied to the piston top side of the cylinder body of the elevating cylinder 42 so that the piston rod protrudes upward (the elevating cylinder 42 is extended). Thus, the lift arm 48 is rotated upward to raise the work implement, and the pressure oil on the piston top side of the cylinder body of the lift cylinder 42 is discharged to retract the piston rod downward (the lift cylinder 42 contracts). ), The lift arm 48 is rotated downward and the work implement is lowered by its own weight, and the supply and discharge of the pressure oil to the lift cylinder 42 is stopped, whereby the lift arm 48 is stopped and the work implement is stopped. Has been.

The mounting body 2, the lift arm 48, the lift rod 49, the lifting cylinder 42, and the like mainly constitute a hydraulic lifting device 50 that lifts and lowers the work implement.
A control valve for controlling the elevating cylinder 42 is disposed on the inner side (lower surface side) of the attachment body 2.
A pair of upper and lower support plates 53 and 54 are fixed to the front end portion of the draw bar support body 17 with an interval in the vertical direction. Further, a receiving plate 55 is fixed to the lower end side of the draw bar support 17 in the middle part in the front-rear direction of the draw bar support 17. The base (front part) of the swing draw bar 57 is inserted and held between the upper wall 19 and the receiving plate 55 of the draw bar support 17 and between the lower support plate 54 and the upper wall 19 of the draw bar support 17. It has become.

Mounting holes 59 are formed in the upper and lower portions of the receiving plate 55 in the left-right direction center portion, the base end portion (front end portion) of the swing draw bar 57 in the left-right direction center portion, and the upper wall 19 of the draw bar support 17. The base end portion of the swing draw bar 57 can be swung left and right around the vertical axis by the mounting pin 60 inserted through the mounting hole 59 into the base end portion of the receiving plate 55, the draw bar support 17 and the swing draw bar 57. It is supported by.
A pair of stopper members 62 are fixed on the left and right sides of the lower support plate 54, and the swing draw bar 57 is in contact with the stopper members 62, thereby restricting the swinging of the swing draw bar 57 within the range between the stopper members 62. It has come to be.

  Three insertion holes 63L, 63M, and 63R are formed on the rear end side of the upper wall 19 of the pair of upper and lower support plates 53 and the draw bar support 17 so as to correspond to the upper and lower sides with a space in the left-right direction. The retaining pin 65 is inserted and held in the support plates 53 and 54 and the drawbar support 17 through the insertion holes 63L, 63M, and 63R so as to be detachable. Therefore, when the two bracing pins 65 are inserted into the pair of support plates 53 and 54 and the draw bar support body 17 through the left and right insertion holes 63L and 63R, the two bracing pins 65 are connected to the swing draw bar 57. By restricting the left and right swinging, it becomes possible to connect a towing work machine or the like at the left and right center position of the tractor vehicle body 1, and swing the swing draw bar 57 to the left or right to contact one stopper member 62. When the retaining pin 65 is inserted through the central insertion hole 63M, the swing draw bar 57 is restricted between the stopper member 62 and the retaining pin 65, and the towing work machine is offset to the left and right with respect to the tractor vehicle body 1. It can be connected in the state.

  According to the above embodiment, the pair of left and right side frames 16 are provided on both sides of the rear portion of the tractor vehicle body 1, and the draw bar support 17 connects the pair of left and right side frames 16 to the left and right. Since the mounting frame 18 is provided, and the pair of left and right lower link pins 39 and the pair of left and right cylinder support pins 31 are provided on the mounting frame 18, the pair of side frame bodies 16 and the drawbar support are supported. A sturdy mounting frame 18 connected to the left and right by the body 17 can be configured. Accordingly, the rigidity of the attachment portions of the draw bar support 17, the pair of left and right lower link pins 39 and the pair of left and right cylinder support pins 31 can be increased, and these can be firmly attached to the rear portion of the tractor vehicle body 1 without fear of rattling. . The draw bar support 17, the pair of left and right lower link pins 39, and the pair of left and right cylinder support pins 31 cause the swing draw bar 57, the pair of left and right lower links 41, and the pair of left and right lifting cylinders 42 to be unexpectedly loose or smooth. It is possible to support it reliably and satisfactorily without hindering the rocking motion.

In addition, since the reinforcing plate 27 is provided on the outer surface of the pair of left and right side frame bodies 16 and the cylinder support pins 31 are supported by the side frame bodies 16 and the reinforcing plate 27, the cylinder support pins are also supported by the reinforcement plate 27. 31 can be firmly supported so as not to rattle, and the elevating cylinder 42 can be more reliably and satisfactorily supported.
In addition, since the draw bar support 17 is attached to the pair of left and right side frames 16 and the tractor vehicle body 1, it can be firmly fixed to the tractor vehicle body 1 without fear of rattling. The draw bar 57 can be stably supported.

A pair of left and right outer frame bodies 29 are fixed to the rear axle case 3 on the outer sides of the pair of left and right side frame bodies 16, and a cylinder is provided between the side frame body 16 and the outer frame body 29. Since the support pin 31 is connected and fixed, the cylinder support pin 31 can be supported by the side frame body 16 and the outer frame body 29 in a both-sided manner. From this point also, the cylinder support pin 31 can be supported. It can be firmly supported without rattling or deformation, and the cylinder support pin 31 can support the elevating cylinder 42 more stably.
Further, a reinforcing plate 35 is provided outside the draw bar support 17. The reinforcing plate 35 is fixed to the draw bar support 17 and also fixed to the tractor vehicle body 1, and the lower link pin 39 is reinforced with the draw bar support 17. Since it is supported by the plate 35, the cylinder support pin 31 can be firmly supported by the reinforcing plate 35 so as not to rattle, and the elevating cylinder 42 can be supported more reliably and satisfactorily.

  In the above-described embodiment, the pair of left and right lift arms 48 are moved up and down only by the pair of lift cylinders 42. Instead, the pair of left and right lift arms 48 are provided at the rear of the tractor vehicle body 1. The lift arm 48 is moved up and down by the hydraulic device, and a pair of left and right lift cylinders 42 are provided on both sides of the rear portion of the tractor vehicle body 1. The lift arm 48 allows the lift arm 48 to move up and down. You may make it assist.

It is a top view of the tractor rear part showing one embodiment of the present invention. It is a side view of the rear part of the tractor. It is a rear view of the rear part of the tractor. It is an enlarged plan view of the rear part of the tractor. It is an enlarged rear view of the rear part of the tractor. It is an enlarged side view of the rear part of the tractor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tractor vehicle body 3 Rear axle case 13 Three-point link mechanism 17 Drawbar support body 18 Mounting frame 27 Reinforcement plate 29 Outer frame body 35 Reinforcement plate 39 Lower link pin 41 Lower link 42 Lifting cylinder 43 Cylinder support pin 48 Lift arm

Claims (5)

A pair of left and right lifting cylinders (42) for lifting the pair of left and right lift arms (48) are provided on both sides of the rear portion of the tractor vehicle body (1), and a pair of left and right lower links (13) of the three-point link mechanism (13) 41) is supported in a vertically swingable manner, and a tractor provided with a draw bar support (17) on the lower end side of the rear part of the tractor vehicle body (1),
A pair of left and right side frames (16) are provided on both sides of the rear portion of the tractor vehicle body (1), and the draw bar support (17) connects the pair of left and right side frames (16) to the left and right. The mounting frame (18) is configured by the pair of side frames (16) and the draw bar support (17).
A lower link pin (39) that supports the base end side of the pair of left and right lower links (41) in a vertically swingable manner on the mounting frame (18), and the lower end side of the pair of left and right lifting cylinders (42) are swung back and forth. A tractor characterized in that a cylinder support pin (31) that is freely supported is provided.   Reinforcing plates (27) are provided on the outer surfaces of the pair of left and right side frames (16), and the cylinder support pins (31) are supported by the side frames (16) and the reinforcing plates (27). The tractor according to claim 1.   The tractor according to claim 1, wherein the draw bar support (17) is mounted on a pair of left and right side frames (16) and a tractor vehicle body (1).   A pair of left and right outer frame bodies (29) are fixed to the rear axle case (3) on the outer side of the pair of left and right side frame bodies (16), and the side frame body (16) and the outer frame body ( 29. The tractor according to claim 1, wherein the cylinder support pin (31) is connected and fixed between the first and second cylinder support pins (29).   A reinforcement plate (35) is provided outside the draw bar support (17), and the reinforcement plate (35) is fixed to the draw bar support (17) and also fixed to the tractor vehicle body (1). The tractor according to claim 1, wherein (39) is supported by a drawbar support (17) and a reinforcing plate (27).

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