JP5884403B2 - Agricultural tractor - Google Patents

Description

  The present invention relates to an agricultural tractor, and more particularly to an improvement of a work machine connection frame that is disposed at a rear portion of a machine body and connects work machines so as to be movable up and down.

  Generally, a farm tractor is constructed so that a field work machine such as a tillage work machine can be moved up and down, but the work machine connection frame is also used as a base member of the safety frame, and the upper surfaces of the left and right frame lower frames are connected by a horizontal frame. Thus, a top link and a lower link are configured on the work machine connection frame, and a three-point link hitch mechanism for connecting the work machines is easily configured (Patent Document 1).

Japanese Patent No. 3684853

  According to the configuration of Patent Document 1, the reinforcement structure of the lower frame of the base member is limited to the overlapping structure of the reinforcing plate and the mounting plate, there is no consideration for rigidization, and when employing a heavy working machine, vibration or the like There is a big shock and needs to be improved.

  In view of the above, an object of the present invention is to provide a base member reinforcement structure and a surrounding component member support structure with a simple configuration.

According to the first aspect of the present invention, the base member 16 to which the safety frame 38 is attached is provided with a pair of left and right frame lower frames 17, 17, and is connected to the frame lower frames 17, 17 to be connected and fixed to the rear portion of the vehicle body. A pair of substrates 20 and 20 is provided, and the first side mounting plate 21 provided along the lower outer surface of the frame lower frame 17 is connected and fixed to the side surface of the vehicle body .
The first side is provided with rear axles 29, 29 extending left and right from the rear part of the vehicle body and connecting the end part to the rear axle case 30, and the rear axle cover 55 surrounding the rear axle 29 is located on the rear side of the rear axle 29. The agricultural tractor is supported by a part mounting plate 21 and a second side mounting plate 53 that is located in front of the rear axle 29 and has a base fixed to the vehicle body .
According to the second aspect of the present invention, the rear axle cover 55 is formed of at least the upper flat plate portion 55S and the front and rear side plate portions 55F and 55R, and the rear axle case 30 is held on the outer end of the rear axle cover 55. 2. The agricultural tractor according to claim 1, wherein the front and rear side plate portions 55 </ b> F and 55 </ b> R are overlapped and connected to the front wall and the rear wall of the rear axle case 30.

According to the third aspect of the present invention , an oil supply port 30c is formed in the upper wall of the rear axle case 30, and a flat plate portion 55S on the upper portion of the rear axle cover 55 is formed at a location corresponding to the upper portion of the oil supply port 30b. The agricultural tractor according to claim 2, wherein an oil supply hole 55 c is formed in the farm.

  According to the first aspect of the present invention, the frame lower frames 17 and 17 of the base member 16 are fixed by the base plates 20 and 20 on the rear surface of the vehicle body, and are provided along the lower outer surface of the frame lower frame 17 on the side surface of the vehicle body. Since it is the structure fixed with the 1 side part attachment board 21, the base member 16 can be firmly fixed with respect to a vehicle body.

Further, the rear axle cover 55 that should surround the rear axle 29 has a first side mounting plate 21 that connects and fixes the frame lower frame 17 and the vehicle body and a base portion that is fixed to the vehicle body in order to be firmly fixed to the vehicle body. Since it is fixed by the 2 side part attachment board 53, a support structure is strong.

According to the second aspect of the present invention, the rear axle case 30 is overlapped and connected around the outer end of the rear axle cover 55 secured to a predetermined strength, so that the rear axle case 30 can be stably supported.

According to the third aspect of the present invention, since the oil supply hole 55c is opened in the flat plate portion 55S of the upper portion of the rear axle cover 55 corresponding to the oil supply port 30c formed in the upper wall of the rear axle case 30, the oil supply operation is facilitated. it can.

It is a side view of an agricultural tractor. It is a back sectional view of a rear axle part. It is a side view of the principal part. It is a rear view of the principal part. It is a top view of the principal part. It is a side view of the principal part which removed the rear axle cover.

  Embodiments of the present invention will be described with reference to the drawings.

  A traveling vehicle body 1 includes front wheels 2, 2 and rear wheels 3, 3 having the same diameter as the front wheel 2, an engine 5 is mounted in a front bonnet 4, a clutch housing 6 at the rear of the engine 5, and a front transmission case 7 and the rear mission case 8 are connected to form a rigid body. A front axle case 10 is supported on a front axle bracket 9 below the engine 5 so that the left and right sides swing up and down around an axial center along the front-rear direction. The front wheels 2 and 2 are mounted on the left and right ends of the front axle case 10 so as to be steered by a steering handle 12 in front of the seat 11 of the vehicle body 1. The front axle case 10 includes a front axle 13 and a front wheel shaft case 14 that is connected to the upper transmission case 10a that is connected and fixed to the end of the front axle case 10 so as to be steerable around a vertical axis. The front wheel 2 is supported on the front wheel shaft 15 in the front wheel shaft case 14. The upper transmission case 10a and the front wheel shaft case 14 are provided with a bevel gear group and a vertical transmission shaft (not shown) provided in alignment with the vertical axis, and the front wheel shaft 15 is driven from the front axle 13 through the vertical transmission shaft. It is configured.

  In the rear transmission case 8, the power shifted through the main transmission mechanism and the subtransmission mechanism is transmitted to the drive shaft 25, transmitted from the drive shaft 25 to the ring gear 26 a of the differential mechanism 26, and then the differential output shafts 27, 27. The left and right rear axles 29, 29 are rotationally transmitted via the axle reduction transmission units 28, 28 by meshing the large and small gears. The transmission of the left and right rear axles 29, 29 is configured such that power is transmitted to the rear wheel shafts 34, 34 via the three transmission gears 31, 32, 33 in the rear axle cases 30, 30. Rear wheels 3 and 3 are attached to the left and right rear wheel shafts 34 and 34.

The front wheel 2 and the rear wheel 3 have the same diameter by setting the length of the front wheel 2 side vertical transmission shaft and the distance between the rear axle 29 and the rear wheel shaft 34 on the rear wheel 3 side. The traveling vehicle body 1 is configured in a so-called high clearance configuration with a high vehicle height.
A safety frame base member 16 shown in FIG. 1 is detachably connected to the rear surface of the rear mission case 8. That is, the base member 16 includes a pair of left and right frame lower frames 17 and 17 each formed of a cylindrical body having a rectangular cross section, and a horizontal frame 18 that connects and rigidizes the upper ends of the frame lower frames 17 and 17. And a connecting frame 19 for connecting the frame lower frames 17 and 17 to the left and right at the base end portions of the frame lower frames 17 and 17. A pair of substrates 20, 20 are fixed to the connecting frame 19 at the left and right intermediate portions in the rear view. Reinforcing support for connecting across the upper and lower intermediate portions of each substrate 20, 20 and the side mounting plates 21, 21 provided along the lower surface of the frame lower frames 17, 17 and the lower outer surface of the frame lower frames 17, 17. The plates 22 and 22 are integrally formed by welding. The support structure of the substrates 20, 20 is obtained by appropriately integrating the reinforcing plate 23 into a rectangular space surrounded by one frame lower frame 17, the substrate 20 on the same side, the connecting frame 19 and the reinforcing support plate 22. Together, the lower side of the base member 16 can be rigidized. The substrates 20 and 20 are formed in an L shape in plan view, or two plate members are formed in an L shape by welding, and the front bent portion 20a is detachably fixed to the rear surface of the rear mission case 8 with a bolt. The side mounting plate 21 provided along the lower outer surface of the frame lower frame 16 is detachably fixed to the side surface of the rear mission case 8 with bolts.
Short rods 37 and 37 for lift rods are fixed to intermediate portions of the left and right frame lower frames 17 and 17 so that the left and right have the same axial center at substantially the same height.
A safety frame 38 is attached to the base member 15. The safety frame 38 is formed by bending a pipe member having a circular cross section into an inverted U shape, and the base plate 38 a of the safety frame 38 is located between the left and right base ends and the base member 15 with respect to the base member 16. And the plate 16a on the base member 16 side, and both are fastened and fixed with bolts.

The rear transmission case 8 and the base member 16 are used to constitute a connecting portion 41 for connecting a top link 39 as a three-point link hitch and lower links 40 and 40. That is, the top link bracket 42 is mounted on the rear end portion of the upper surface of the rear mission case 8 so as to be positioned at the left and right central portions. Further, the support shaft 43 passes through the cylindrical bodies 44 and 44 formed at the lower rear end of the rear mission case 8 and the connecting holes 20b and 20b formed in the substrates 20 and 20, respectively. Of these, the base end side of the top link 39 is mounted on the bracket 42 so as to be rotatable up and down, and the lower links 40 and 40 are mounted on both end portions of the support shaft 43 protruding. By the top link 39 and the lower links 40, 40, the work machine 45 (in the illustrated example, a plowing work machine) can be connected to be able to move up and down. Reference numerals 46 and 46 denote lift arms which are provided on a support shaft 47 provided so as to pass through the lift rod short cylinders 37 and 37 so as to freely rotate up and down. The upper ends of lift rods 48, 48 connected to the lower links 40, 40 are connected to each other, so that the work implement 45 can be moved up and down by extension and contraction of the work implement lift cylinder mechanism 49.
The cylinder mechanism 49 includes a cylinder portion 49s supported in a horizontal posture at the upper portion of the rear mission case 8, and a piston portion 49p that expands and contracts with respect to the cylinder portion 49s. It can be expanded and contracted horizontally by control.
With the configuration described above, the top link bracket 42 is mounted using the reinforcing structure of the safety frame base member 16, so that the member can be used in combination as compared with a dedicated reinforcing structure. Can be implemented at low cost.

  Next, the cover configuration of the rear axle 29 will be described in detail below. A brake 51 formed at the end of the differential output shaft 27 and a rear axle metal 52 formed so as to cover the base end side of the rear axle 29 are detachably attached to the left and right side portions of the rear mission case 8. A side mounting plate 21 connected to the base of the frame lower frame 17 of the base member 16 is detachably rigidly integrated with the outer surface of the rear axle metal 52 by bolt tightening. Accordingly, the side mounting plate 21 is positioned on the rear side of the rear axle 29, but the second side of the front axle with the rear axle 29 sandwiched by the rear transmission case 8 in an L shape in plan view is appropriately bolted. Side mounting plates 53 are provided.

  A rear axle cover 55 having a U-shaped cross section is provided to surround the upper surface and the front and rear surfaces of the rear axle 29. That is, the rear axle cover 55 is bent and formed into at least a flat plate portion 55S, a front plate portion 55F, and a rear plate portion 55R on the upper surface, and the front plate portion 55F and the rear plate portion 55R corresponding to the outer end are vertically moved. It has a long shape. Flange bodies 55a and 55b are fixed to one side of the rear axle cover 55, the flange bodies 55a and 55b, the side mounting plate (hereinafter referred to as the first side mounting plate) 29, and the second side mounting plate 53. The rear axle cover 55 is fixedly fastened together. The outer end of the rear axle cover 55 is superposed on the front and rear walls of the rear axle case 30 by overlapping portions formed above and below the front plate portion 55F and the rear plate portion 55R to hold the rear axle case 30. It is the structure which fastens a bolt.

  With this configuration, the first side mounting plate 29 that is stably supported by the reinforcing structure of the frame lower frame 17 of the base member 16 and the second side mounting plate 53 that extends from the strong rear transmission case 8 are provided. Thus, the rear axle cover 55 can be firmly attached, and the support structure of the rear axle case 30 is also stabilized.

  The shape of the rear axle cover 55 is a U-shape as described above. However, in the embodiment, the shapes of the front side and the rear side are made different so that the lower edge has a height difference, and the rear axle case 30 As described above, since the support portion is extended slightly downward to increase the degree of freedom of the fastening portion, the shapes of the left and right rear axle covers 55 and 55 are different. The shape can be made the same, and misassembly can be prevented.

  Further, although the brake arm 51a of the brake 51 is located in the inner space due to the bent configuration of the second side mounting plate 53, the arm 51a can be protected from an unexpected collision with another object.

  The rear axle case 30 is composed of a pair of half case portions 30a and 30b that are aligned in the middle of the left and right. By holding the half case portions 30a and 30b upside down, a holding space for the gears 31 to 33 can be formed inside, and the upper body 1 has a shaft hole that allows the rear axle 29 to be inserted. On the other hand, a shaft hole that allows the rear wheel shaft 34 to be inserted is provided on the outer side on the lower side, or can be formed symmetrically in other configurations, and the half case portions 30a and 30b can be set to a common specification. Note that a relatively large oil supply port 30c is formed in one of the pair of half-case portions 30a and 30b, and a drain hole 30d having a standard diameter is formed in the other. Since it has an inclined surface, it is possible to secure a large area of the hole machining portion, in particular, it is possible to easily machine the large-diameter oil supply port 30c, and furthermore, it can be set to a position displaced from the position directly above the gear 31, so that the oil jumps up It is difficult to receive and has the effect of preventing oil leakage.

  An oil supply hole 55c is formed in the flat plate portion 55S of the rear axle cover 55 at a location corresponding to the upper portion of the oil supply port 30c to facilitate the oil supply operation.

1 Body 8 Rear mission case (body)
16 Base member 17 Frame lower frame 20 Substrate 21 First side mounting plate 29 Rear axle 30 Rear axle case 30c Refueling port 38 Safety frame 53 Second side mounting plate 55 Rear axle cover 55S Flat plate portion 55F Front side plate portion 55R Rear side plate 55a Flange body 55b Flange body

Claims (3)

A base member (16) to which the safety frame (38) is mounted is provided with a pair of left and right frame lower frames (17, 17), and is connected to these frame lower frames (17, 17) to be connected and fixed to the rear part of the vehicle body. The first side mounting plate (21) provided along the lower outer surface of the frame lower frame (17) is connected and fixed to the side surface of the vehicle body .
A rear axle (29, 29) is provided that extends from the rear of the vehicle body to the left and right and has an end connected to the rear axle case (30). A rear axle cover (55) that surrounds the rear axle (29) is provided on the rear axle (29). Agricultural support formed by the first side mounting plate (21) located on the rear side and the second side mounting plate (53) on the front side of the rear axle (29) and having the base fixed to the vehicle body . Tractor. A rear axle cover (55) is formed of at least an upper flat plate portion (55S) and front and rear side plate portions (55F, 55R), and a rear axle case (30) is held at an outer end of the rear axle cover (55). The agricultural tractor according to claim 1, wherein the front and rear side plate portions (55F, 55R) are superposed on and connected to the front wall and the rear wall of the rear axle case (30) . An oil supply port (30c) is formed on the upper wall of the rear axle case (30), and a flat plate portion (55S) of the upper portion of the rear axle cover (55) is formed at a location corresponding to the upper portion of the oil supply port (30b). The agricultural tractor according to claim 2, wherein an oil supply hole (55 c) is formed in the structure .

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