JP2015003553A - Semi-crawler device for tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce mud and snow accumulated at an attaching part of a truck frame in a tractor comprising a semi-crawler device so as to reduce frequency of operations for removal of accumulation.SOLUTION: In a semi-crawler device for a tractor, a crawler 19 is wound on a driving sprocket 14, a front tension wheel 17, a plurality of idle wheels 16, and a rear driven wheel 18. A truck supporting bracket supporting a crawler frame 15 journaling the plurality of idle wheels 16 is journaled with a rear axle case. The truck supporting bracket is constructed with a cast member having an integral construction consisting of a journaling part 22b, an attaching part 22a of a crawler frame 15 and legs 22c and 22d branching from the journaling part 22b to the attaching part 22a in a longitudinal direction.

Description

  The present invention relates to a semi-crawler device in a tractor including a pair of left and right front wheels and left and right semi-crawler devices.

Conventionally, a tractor equipped with a pair of left and right front wheels and a left and right semi-crawler device has been developed as a tractor suitable for use in wet fields and snowy roads.
For example, Japanese Patent Application Laid-Open No. 2013-39923 describes a semi-crawler device in which a crawler is wound around a driving wheel, a front tension wheel, a rear driven wheel, and three freewheeling wheels to form a triangular shape in a side view. Yes.

  The track frame that pivotally supports the three idler wheels is provided with an extending base formed of a plate material or the like that protrudes from the main body portion toward the traveling machine body, and a swing support body is provided on the extending base. It is fixed with bolts, and the upper part of the swing support is supported by a swing shaft that is a horizontal horizontal shaft supported by a reinforcing frame. The reinforcing frame has a mounting frame body fixed to the left and right rear axle cases with bolts, and a connecting member fixed to the lower surface of the transmission case with bolts and both left and right ends connected to the mounting frame body. ing. (Paragraph 0023 on page 6)

JP 2013-39923 A

  A tractor equipped with a semi-crawler device is often used in wet fields and snowy roads, and mud and snow that have entered inside the crawler accumulate on the track frame and on the swing support. Therefore, it is necessary to remove deposits before traveling becomes difficult.

  Therefore, an object of the present invention is to reduce mud and snow accumulated on the mounting portion of the track frame in a tractor equipped with a semi-crawler device so that the frequency of work for removing deposition can be reduced.

The problems of the present invention are solved by the following technical means.
According to the first aspect of the present invention, there is provided a tractor in which a crawler (19) is wound around a drive sprocket (14), a front tension roller (17), a plurality of idler wheels (16), and a rear driven wheel (18). In the semi-crawler device (5), a track support bracket (22) that supports a crawler frame (15) that supports a plurality of idlers (16) is supported on a rear axle case (20), and the track support bracket ( 22) from the shaft support portion (22b), the mounting portion (22a) of the crawler frame (15), and the support legs (22c) and (22d) branching back and forth from the shaft support portion (22b) with respect to the mounting portion (22a). A semi-crawler device for a tractor characterized in that it is constituted by an integrally formed casting member.

  The invention according to claim 2 is characterized in that the track support bracket (22) of the left and right semi-crawler device (5) provided at the rear portion of the tractor (1) has a left-right symmetric shape. A device.

  The invention according to claim 3 is characterized in that the track support bracket (22) is pivotally supported on the swing shaft (21) provided in the rear axle case (20) so as to be able to swing back and forth. The semi-crawler device for a tractor according to Item 2.

  The invention according to claim 4 is characterized in that the thickness of the mounting portion (22a) to which the crawler frame (15) of the track support bracket (22) is attached is made uniform. A semi-crawler device for tractors.

  According to a fifth aspect of the present invention, the upper surface (22a1) of the attachment portion (22a) to which the crawler frame (15) of the track support bracket (22) is attached is inclined in the left-right direction. A semi-crawler device for a tractor according to any one of the above.

  According to the first aspect of the present invention, the track is made of an integrally formed cast member comprising the shaft support portion 22b, the mounting portion 22a of the crawler frame 15, and the support legs 22c and 22d branched from the shaft support portion 22b back and forth with respect to the mounting portion 22a. By configuring the support bracket 22, there is no gap for mounting on the mounting portion 22a, the shaft support portion 22b, and the support legs 22c and 22d, and the outer periphery of each portion is rounded, and mud, snow, etc. are difficult to adhere. The frequency of deposit removal work can be reduced.

  According to the second aspect of the present invention, since the track support brackets 22 of the semi-crawler device 5 provided on the left and right of the rear portion of the tractor 1 can be used in the same shape and distributed to the left and right, the manufacturing cost can be reduced.

  According to the third aspect of the present invention, by removing the swing shaft 21 from the track support bracket 22, the track support bracket 22 and the crawler frame 15 can be integrally removed, so that repair and maintenance are facilitated.

According to the fourth aspect of the present invention, the bolts for attaching the crawler frame 15 to the attachment portion 22a of the track support bracket 22 can be made common to facilitate the assembly.
According to the fifth aspect of the present invention, mud and soil that are placed on the upper surface 22a1 of the mounting portion 22a of the track support bracket 22 are easily discharged to the outside.

It is a right view of a tractor. It is a right view of a semi-crawler device. It is a top view except a crawler of a semi crawler device. It is a right view except a crawler of a semi crawler device. It is a perspective view except a crawler of a semi crawler device. It is a perspective view from the inner side except a crawler of a semi crawler device. It is a bottom view except a crawler of a semi crawler device. It is a mounting part perspective view of a track support bracket. It is an assembly partial side sectional view of a compression spring which constitutes a tension device of a front tension ring.

  Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. In this specification, the left and right directions in the forward direction of the tractor 1 are referred to as left and right, respectively, the forward direction is referred to as forward, and the reverse direction is referred to as rear.

  First, as shown in FIG. 1, the tractor 1 has a pair of left and right front wheels 2 and 2 mounted on the front portion of the tractor vehicle body 12 and a rear wheel 13 on which a normal rear wheel on the rear portion is attached. Instead, a semi-crawler device 5 described later is configured. The tractor body 12 has a driver's cockpit 8 mounted on the upper side, and an engine room 11 covered with a bonnet 10 is formed on the front side of the tractor body 12 so that the engine is internally provided.

  A ground working machine such as a rotary tiller 6 is attached to the rear portion of the tractor vehicle body 12 by a connecting device 7. A steering handle 9 is provided on the front side of the driver's cockpit 8, and steering switches and levers are concentrated on the periphery thereof so that the tractor 1 can be operated while sitting.

Next, the semi-crawler device 5 provided on the left and right sides will be described with reference to FIG.
The left and right semi-crawler device 5 includes a drive sprocket 14 fixed to a rear axle 13 protruding left and right from the mission case 12, a front tension wheel 17, three idler wheels 16, 16, 16 and a rear driven wheel 18. The crawler 19 is wound around.

  As shown in FIGS. 6 and 7, a swing case 32 is attached with a bolt 33 at a position directly below the rear axle 13 of the rear axle case 20 fixed to the transmission case 12 and pivotally supporting the rear axle 13. The track support bracket 22 is pivotally supported by the swing shaft 21. The front and rear raised portions 22 e provided on the track support bracket 22 sandwich the front and rear raised portions 32 a provided on the swing case 32 to restrict the front and rear swing range of the track support bracket 22. Further, the swing case 32 is integrally provided with a chain check bracket 34 to restrict the movement range of the top link.

  As shown in FIG. 8, the swing case 32 has a distance from the mounting hole of the bolt 33 to the end face of the shaft support hole for supporting the swing shaft 21 as A is short on the left and B is long on the right. By changing the left and right moving cases 32, the left and right intervals of the track support bracket 22 can be changed, and the left and right intervals of the left and right semi-crawler devices 5, that is, the tread can be changed by simultaneously changing the left and right intervals of the drive sprocket 14. Become.

  The track support bracket 22 is integrally formed by casting in a configuration in which a mounting portion 22a that is long before and after the crawler frame 15 is mounted, and support legs 22c and 22d that are disposed on the mounting portion 22a from the upper shaft support portion 22b to the front and rear. . The corners of the outer peripheral surface of the track support bracket 22 are rounded to make it difficult for mud and snow to adhere.

  The upper surface 22a1 and the lower surface 22a2 of the attachment portion 22a of the track support bracket 22 are inclined downward with the same thickness in the same direction in the left and right directions, so that mud and snow placed on the upper surface 22a1 are easily discharged. The left and right track support brackets 22, 22 have a symmetrical shape, and the same parts are attached to the left and right of the rear axle 13 while being rearranged. The crawler frame 15 is attached to the attachment portion 22a of the track support bracket 22 with bolts. However, since the thickness of the attachment portion 22a is uniform, bolts having the same length may be used.

  A tension device 23 that repels the front tension roller 17 is attached to the front upper portion of the crawler frame 15 with a bolt. The tension device 23 includes an inner cylinder 25 in which a shaft support portion 24 that supports the front tension wheel 17 is attached with a bolt, an outer cylinder 26 that externally covers the inner cylinder 25, and a compression spring 27 that is housed in the inner cylinder 25. The front tension wheel 17 is moved and adjusted forward and downward by an adjustment bolt 28 that pushes the core shaft 41 in the spring 27.

  Below the inner cylinder 25, a front scraper 31a that approaches the outer peripheral surface of the front tension roller 17 and scrapes off mud is attached with a bolt so as to follow the front-rear movement of the front tension roller 17. Further, an opening 26 a is formed in the lower portion of the outer cylinder 26 so that mud that has entered the inside is discharged by the expansion and contraction of the compression spring 27.

  FIG. 9A shows a method of assembling the compression spring 27. The core shaft 41 welded to the receiving seat 40 is passed through the compression spring 27, the recessed seat 42 is inserted into the compression spring 27, and the nut is inserted through the washer 43. 44 is screwed onto the threaded portion of the core shaft 41 to regulate the extension length of the compression spring 27 so that excessive tension does not act on the crawler 19. FIG.9 (b) has shown the state set to the crawler traveling apparatus 5 like FIG.

  A rear driven wheel bracket 29 that pivotally supports the rear driven wheel 18 is attached to the rear end of the crawler frame 15 with a bolt. A scraper 31c is attached to the upper surface 22a1 of the mounting portion 22a of the track support bracket 22 by a bolt after approaching the outer peripheral surface of the rear driven wheel 18 and scraping off mud.

  An idler bracket 30 that pivotally supports the idler wheel 16 is attached to the lower end surface of the crawler frame 15 with a bolt, and an intermediate scraper 31b that approaches the outer peripheral surface of each idler wheel 16 and scrapes off mud is attached with a bolt. Yes.

  A track support bracket 22 that supports a crawler frame 15 that pivotally supports a plurality of idle wheels 16 is pivotally supported on the rear axle case 20, and the track support bracket 22 is attached to a shaft support portion 22b, a mounting portion 22a of the crawler frame 15, and the mounting portion. It is comprised by the casting member of the integral structure which consists of the support legs 22c and 22d branched from the axial support part 22b back and forth with respect to 22a. As a result, the track support bracket 22 is constituted by an integrally formed casting member comprising the shaft support portion 22b, the mounting portion 22a of the crawler frame 15, and the support legs 22c and 22d branched from the shaft support portion 22b back and forth with respect to the mounting portion 22a. Thus, there is no gap for mounting on the mounting portion 22a, the shaft support portion 22b, and the support legs 22c and 22d, and the outer periphery of each portion is rounded, so that mud, snow, etc. are difficult to adhere, and the deposit removal work The frequency can be reduced.

  The track support bracket 22 of the left and right semi-crawler device 5 provided at the rear portion of the tractor 1 is made symmetrical. As a result, the track support brackets 22 of the semi-crawler device 5 provided on the left and right of the rear portion of the tractor 1 can be used in the same shape and distributed to the left and right, so that the manufacturing cost can be reduced.

  The track support bracket 22 is pivotally supported by a swing shaft 21 provided on the rear axle case 20 so as to be able to swing back and forth. Thus, by removing the swing shaft 21 from the track support bracket 22, the track support bracket 22 and the crawler frame 15 can be removed integrally, and repair and maintenance are facilitated.

  The thickness of the attachment portion 22a to which the crawler frame 15 of the track support bracket 22 is attached is made uniform. Thereby, the length of the bolt for attaching the crawler frame 15 to the attachment portion 22a of the rack support bracket 22 can be made common to facilitate assembly.

  The upper surface 22a1 of the attachment portion 22a for attaching the crawler frame 15 of the track support bracket 22 is inclined in the left-right direction. Thereby, the mud and the soil that have been placed on the upper surface 22a1 of the mounting portion 22a of the track support bracket 22 are easily discharged to the outside.

  A swing case 32 is detachably attached to the bottom of a rear axle case 20 that supports the rear axle 13 of the drive sprocket 14, and a track support bracket 22 is pivotally supported by the swing shaft 21 on the swing case 32. Thereby, since the left and right semi-crawler devices 5 are attached to the rear axle case 20 via the swing case 32, the semi-crawler device 5 can be removed when the swing case 32 is removed, so that maintenance such as repair is facilitated.

  The swing case 32 is attached to the rear axle case 20 with a bolt 33 from below. Thereby, the semi-crawler device 5 can be easily removed by lifting the body of the tractor and removing the bolt 33 from below.

  A swing case 32 in which the distance from the mounting position to the mounting end surface of the swing shaft 21 is different on the left and right is provided on the bottom of the rear axle case 20 so as to be mounted on the bottom. As a result, when the swing case 32 is mounted to be shifted left and right, the interval between the left and right semi-crawler devices 5 can be changed.

  The swing case 32 is provided with a raised portion 22e that restricts the swing of the track support bracket 22 in the front-rear direction. Thereby, the structure of the back-and-forth swing regulation of the track support bracket 22 is simplified.

DESCRIPTION OF SYMBOLS 1 Tractor 5 Semi-crawler device 14 Drive sprocket 15 Crawler frame 16 Free wheel 17 Front tension wheel 18 Rear driven wheel 19 Crawler 20 Rear axle case 21 Oscillating shaft 22 Track support bracket 22a Mounting portion 22a1 Upper surface 22a2 Lower surface 22b Shaft support portion 22c 22d support legs

Claims (5)

  In a semi-crawler device (5) of a tractor in which a crawler (19) is wound around a drive sprocket (14), a front tension wheel (17), a plurality of idler wheels (16), and a rear driven wheel (18), A track support bracket (22) that supports the crawler frame (15) that supports the idler wheel (16) is supported on the rear axle case (20), and the track support bracket (22) is connected to the shaft support portion (22b). The crawler frame (15) has a mounting part (22a) and a cast member having an integral structure composed of support legs (22c) and (22d) branching back and forth from the shaft support part (22b) with respect to the mounting part (22a). A tractor semi-crawler device.   The semi-crawler device for a tractor according to claim 1, wherein the left and right semi-crawler devices (5) provided on the rear part of the tractor (1) have a left-right symmetrical track support bracket (22).   The semi-crawler device for a tractor according to claim 1 or 2, wherein the track support bracket (22) is pivotally supported on a swing shaft (21) provided on the rear axle case (20) so as to be able to swing back and forth. .   The semi-crawler device for a tractor according to any one of claims 1 to 3, wherein a thickness of a mounting portion (22a) to which the crawler frame (15) of the track support bracket (22) is attached is made uniform.   The semi-crawler of a tractor according to any one of claims 1 to 4, wherein an upper surface (22a1) of a mounting portion (22a) to which the crawler frame (15) of the track support bracket (22) is attached is inclined in the left-right direction. apparatus.

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