JP6603587B2 - Tractor - Google Patents

Description

  The present invention relates to a tractor used by connecting work machines.

  A general agricultural tractor lifts and lowers the left and right lower links via left and right lift rods while supporting the work implement so as to be movable up and down via a three-point link mechanism comprising a single top link and left and right lower links. The work machine is configured to move up and down according to the hydraulic operation of the arm.

  This type of tractor includes left and right lower link support shafts at the rear of the fuselage. Since the left and right lower link support shafts support the work machine via the left and right lower links, it is required to secure a support strength that can withstand the traction load of the work machine. For example, Patent Documents 1 and 2 describe a tractor that supports both lower link support shafts.

Japanese Patent No. 5204515 Japanese Patent No. 4745132

  However, in the tractors described in Patent Documents 1 and 2, when supporting the lower link support shaft at both ends, one end side of the lower link support shaft is supported at the rear end portion of the transmission case, while the left and right outer sides from the rear portion of the transmission case. Since the other end side of the lower link support shaft is supported by the left and right rear axle cases projecting from the rear, there is a risk of being affected by dimensional errors and distortion generated between the transmission case and the rear axle case.

The present invention was created with the object of solving these problems in view of the above-mentioned circumstances, and the invention of claim 1 is characterized in that a mission case and a rear portion of the mission case protrude from the left and right outwards. A transmission tractor comprising: left and right rear axle cases that support left and right rear wheels; and left and right lower link support shafts that are provided at a rear portion of the body and support work machines via left and right lower links. A tractor comprising a reinforcing member for connecting a rear end portion of the rear axle and the left and right rear axle cases, wherein the left and right lower link support shafts are both supported by a lower link bracket provided on the reinforcing member. is there.
The invention according to claim 2 is characterized in that the reinforcing member connects a rear end portion of the transmission case and the left and right rear axle cases via a single frame member. It is a tractor.
According to a third aspect of the present invention, the reinforcing member includes a left frame member that connects the left rear axle case and the rear end portion of the transmission case, a right rear axle case, and a rear end portion of the transmission case. The tractor according to claim 1, wherein the tractor is divided into reinforcing members each having a right frame member for connecting the two.
According to a fourth aspect of the present invention, in the reinforcing member, left and right rear axle fixing members for fixing the reinforcing member to the left and right rear axle cases are provided detachably with respect to the frame member. The tractor according to 2 or 3 .

According to the first aspect of the present invention, the reinforcing member for connecting the rear end portion of the transmission case and the left and right rear axle cases is provided, and the left and right lower link support shafts are both supported by the lower link bracket provided on the reinforcing member. Further, it is possible to increase the support strength of the lower link support shaft while eliminating the influence of dimensional error and distortion generated between the transmission case and the rear axle case.
According to the invention of claim 2, since the reinforcing member connects the rear end portion of the transmission case and the left and right rear axle cases via one frame member, the connection strength is increased with an inexpensive and simple configuration. be able to.
According to the invention of claim 3, the reinforcing member connects the left frame member that connects the left rear axle case and the rear end portion of the transmission case, and the right rear axle case and the rear end portion of the transmission case. Since it is divided into a reinforcing member having a right frame member, the dimension existing between the transmission case and the left and right rear axle cases is compared to the case where the transmission case and the left and right rear axle cases are connected by a single reinforcing member. The influence of error can be reduced.
According to the fourth aspect of the present invention, even if a dimensional error exists between the transmission case and the left and right rear axle cases, the dimensional error is absorbed by the connecting portion between the detachable rear axle fixing member and the frame member. Can do. For example, if the connecting part is fastened and fixed by a bolt that penetrates a long hole that is long in the left-right direction, it is possible to absorb a dimensional error in the left-right direction.

It is a side view of a tractor concerning an embodiment of the present invention. It is a perspective view which shows the body rear part of the tractor which concerns on embodiment of this invention. It is a perspective view which shows the reinforcement member, lower link, and check chain of the tractor which concern on embodiment of this invention. It is a perspective view which shows the reinforcement member and drawbar of the tractor which concern on embodiment of this invention. It is a perspective view which shows the reinforcement member of the tractor which concerns on embodiment of this invention. It is a figure which shows the reinforcement member of the tractor which concerns on embodiment of this invention, (A) is a front view, (B) is a rear view, (C) is a side view. It is a perspective view which shows the reinforcement member of the tractor which concerns on 2nd Embodiment of this invention. It is a figure which shows the reinforcement member of the tractor which concerns on 2nd Embodiment of this invention, (A) is a front view, (B) is a rear view, (C) is a side view.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2, reference numeral 1 denotes a tractor traveling body, which includes an engine (not shown) mounted on the front of the body, a transmission case 2 for shifting engine power, A work machine in which a front wheel 3 is connected to a front axle case (not shown), left and right rear axle cases 5 that support left and right rear wheels 4, a driving unit 6 on which an operator gets on, and a work machine (not shown). And a connecting portion 7. The mission case 2 is provided along the front-rear direction at the left and right center of the lower part of the aircraft, and the left and right rear axle cases 5 are provided so as to protrude outward from the left and right sides of the rear part.

  As shown in FIG. 2, the work implement connecting portion 7 constitutes a three-point link mechanism that supports the work implement so as to be movable up and down via a single top link 8 and left and right lower links 9. A top link bracket 11 that supports the top link 8 via the top link support shaft 10 so as to be pivotable up and down; Left and right lower link brackets 13 that support the upper and lower pivots 9 and left and right lift arms that are provided on the upper rear part of the machine body so as to be pivotable up and down and suspend the left and right lower links 9 via the left and right lift rods 14. 15 and a lift cylinder (not shown) for rotating the lift arm 15 up and down, and the work implement is raised and lowered according to the hydraulic expansion and contraction operation of the lift cylinder. In FIG. 2, a member denoted by reference numeral 16 is a draw bar provided in the work machine connection unit 7 to connect the traction work machine.

  As shown in FIG. 2, a reinforcing member 17 that connects and reinforces the rear end portion of the mission case 2 and the left and right rear axle cases 5 is provided at the rear portion of the traveling machine body 1. As shown in FIGS. 2 to 6, the reinforcing member 17 includes a mission fixing member 18 that is bolted to the rear end of the mission case 2, and left and right rear axles that are bolted to the inner side surfaces of the left and right rear axle cases 5. A fixing member 19, and a frame member 20 that connects the mission fixing member 18 and the left and right rear axle fixing members 19 are provided.

  The reinforcing member 17 of the present embodiment connects the rear end portion of the mission case 2 and the left and right rear axle cases 5 via a single frame member 20. Specifically, the frame member 20 is configured by a square tubular pipe member, the rear axle fixing member 19 is provided at both left and right ends thereof, and the mission fixing member 18 is provided at the left and right intermediate portions. This makes it possible to increase the connection strength between the transmission case 2 and the left and right rear axle cases 5 with an inexpensive and simple configuration.

  The mission fixing member 18 is a plate member having an L shape in side view, and is integrally welded to the left and right center portions of the frame member 20 and is bolted to the rear end surface and the rear end portion lower surface of the mission case 2.

  The rear axle fixing member 19 is a plate member having a triangular shape in side view, and is integrally fixed to both left and right ends of the frame member 20 and is bolted to the inner side surfaces of the left and right rear axle cases 5. Note that the rear axle fixing member 19 of the present embodiment is also used as an attachment member for the check chain 21 that restricts lateral blurring of the lower link 9.

  The rear axle fixing member 19 of the present embodiment has a frame connecting portion 19a having a cross-sectional shape that can be fitted to an end portion of the frame member 20, and penetrates the frame connecting portion 19a and the frame member 20 in the front-rear direction. It is detachably connected to the frame member 20 using a bolt 19b and a nut 19c screwed into the bolt 19b. As a result, even if there is a dimensional error between the transmission case 2 and the left and right rear axle cases 5, it is possible to absorb the dimensional error at the connecting portion between the detachable rear axle fixing member 19 and the frame member 20. . For example, if the bolt through hole of the frame member 20 is a long hole extending in the left-right direction, it is possible to absorb a dimensional error in the left-right direction that exists between the mission case 2 and the left and right rear axle cases 5.

  The reinforcing member 17 is provided with left and right lower link brackets 13 that support the left and right lower link support shafts 12. The lower link brackets 13 are positioned at the left and right ends of the mission fixing member 18 and are arranged on the outer side of the inner plate 22 with a predetermined gap between the inner plate 22 welded to the mission fixing member 18 and the frame member 20. The outer link 23 is welded to the frame member 20, and the lower link support shaft 12 is supported at both ends between the plates 22 and 23.

  That is, the left and right lower link brackets 13 are provided on the reinforcing member 17 that connects the transmission case 2 and the left and right rear axle cases 5, and the left and right lower link support shafts 12 are supported at both ends by the lower link bracket 13. The support strength of the lower link support shaft 12 can be enhanced while eliminating the influence of dimensional errors and distortion that occur between the rear axle case 2 and the rear axle case 5.

  Incidentally, the lower link support shaft 12 of this embodiment includes a shaft portion 12a penetrating through mounting holes 22a and 23a formed at the tip portions of both plates 22 and 23, and a stopper plate welded to one end portion of the shaft portion 12a. 12b and a retaining pin 12c that is removably attached to the other end portion of the shaft portion 12a, and can be attached to and detached from the lower link bracket 13 in accordance with the insertion and removal of the retaining pin 12c.

  According to the present embodiment configured as described, the transmission case 2, the left and right rear axle cases 5 projecting outward from the rear side of the transmission case 2 and supporting the left and right rear wheels 4, and the rear part of the fuselage A tractor provided with left and right lower link support shafts 12 provided to support the work machine via left and right lower links 9, and a reinforcing member 17 that connects the rear end portion of the transmission case 2 and the left and right rear axle cases 5. The left and right lower link support shafts 12 are supported at both ends by a lower link bracket 13 provided on the reinforcing member 17, thereby eliminating the influence of dimensional errors and distortions that occur between the transmission case 2 and the rear axle case 5. However, the support strength of the lower link spindle 12 can be increased.

  Further, since the reinforcing member 17 connects the rear end portion of the transmission case 2 and the left and right rear axle cases 5 via the single frame member 20, the connection strength can be increased with an inexpensive and simple configuration.

  The reinforcing member 17 includes a mission fixing member 18 fixed to the mission case 2, left and right rear axle fixing members 19 fixed to the left and right rear axle cases 5, a mission fixing member 18, and left and right rear axle fixing members 19. Since the frame member 20 to be connected and the left and right lower link brackets 13 that support the left and right lower link support shafts 12 are provided, and the rear axle fixing member 19 is detachable from the frame member 20, the transmission case 2 and the left and right rear axle cases Even if there is a dimensional error between 5 and 5, the dimensional error can be absorbed by the connecting portion between the detachable rear axle fixing member 19 and the frame member 20.

  Next, a reinforcing member 17B according to a second embodiment of the present invention will be described with reference to FIGS. However, about the structure which is common in the said embodiment, description of the said embodiment is used by using the same code | symbol as the said embodiment.

  As shown in FIGS. 7 and 8, the reinforcing member 17B of the second embodiment includes a left reinforcing member 17L that connects the left rear axle case 5 and the rear end of the transmission case 2, and the right rear axle case 5 and the transmission. The point which is divided | segmented into the right side reinforcement member 17R which connects the rear-end part of case 2 is different from the said embodiment. Specifically, the mission fixing member 18 is divided into a left mission fixing member 18L and a right mission fixing member 18R at its left and right center positions, and the frame member 20 is divided into a left frame member 20L and a right frame member 20R at its left and right center positions. The other parts are the same as in the above embodiment.

  According to such a reinforcing member 17 </ b> B, a dimensional error existing between the transmission case 2 and the left and right rear axle cases 5 compared to the case where the transmission case 2 and the left and right rear axle cases 5 are connected by one reinforcing member 17. Can be reduced.

DESCRIPTION OF SYMBOLS 1 Traveling machine body 2 Mission case 3 Front wheel 4 Rear wheel 5 Rear axle case 7 Work machine connection part 9 Lower link 12 Lower link support shaft 13 Lower link bracket 17 Reinforcement member 17B Reinforcement member 17L Left side reinforcement member 17R Right side reinforcement member 18 Mission fixing member 19 Rear axle fixation Member 20 Frame member

Claims (4)

Mission case,
Left and right rear axle cases that protrude from the rear of the transmission case to the left and right outer sides and support the left and right rear wheels,
A tractor that is provided at the rear of the machine body and includes left and right lower link support shafts that support the work machine via the left and right lower links,
A reinforcing member for connecting the rear end of the transmission case and the left and right rear axle cases;
The left and right lower link support shafts are both supported by lower link brackets provided on the reinforcing member.   2. The tractor according to claim 1, wherein the reinforcing member connects a rear end portion of the transmission case and the left and right rear axle cases via a single frame member. The reinforcing member includes a left frame member connecting a rear end portion of the the left of the rear axle case the transmission case, and a right frame member connecting a rear end portion of the transmission case and right side of the rear axle case The tractor according to claim 1, wherein the tractor is divided into reinforcing members . The reinforcing member is
The tractor according to claim 2 or 3 , wherein left and right rear axle fixing members for fixing to the left and right rear axle cases are detachably attached to the frame member.

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