JP3809796B2 - Crawler support device for tractor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crawler support device that restricts the twisting of a crawler in a left-right direction in a so-called semi-crawler tractor, and more particularly to a crawler support device that can simplify maintenance.
[0002]
[Prior art]
Conventionally, a crawler support device shown in FIG. 6 is known. The crawler support device regulates the right and left twisting of the crawler provided so as to be swingable around the rear axle of the tractor. The crawler support device 101 has an upper frame 103 attached to the outside of the vehicle body 102 of the tractor inserted into a rectangular hollow frame 105 attached to the crawler 104 side. Consists of.
[0003]
The upper frame 103 is configured so as to be spanned between a transmission case on the vehicle body 102 side and a rear axle case. The hollow frame 105 has a left and right width dimension determined so as to be slidable on both side surfaces of the upper frame 103 inserted and disposed in the hollow portion, and the crawler 104 swings around the rear axle. The vertical dimension of the hollow portion is determined within the range. The hollow frame 105 is fixed near the tip of the crawler frame 106. The crawler steadying device configured as described above can regulate the twisting in the left-right direction while allowing the crawler 104 to swing in the front-rear direction within the range of the hollow frame 105.
[0004]
[Problems to be solved by the invention]
However, the crawler support device 101 having the above configuration easily adheres mud and dust to the upper frame 103, the hollow frame 105, and the like, and maintains a sliding portion between the upper frame 103 and the hollow frame 105 that are inserted and arranged. For this reason, it was necessary to carry out troublesome work every time in order to remove the deposits and the like.
[0005]
An object of the present invention is to provide a crawler support device capable of simplifying maintenance.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 regulates twisting of the crawler frame (5) provided on the rear axle (20) and the crawler attached to the crawler frame (5) in the left-right direction. In addition, in the crawler support device of the tractor that can swing the crawler frame (5) and the crawler attached to the crawler frame (5) around the rear axle (20) ,
An upper frame (4) disposed in the front-rear direction is provided on the vehicle body of the tractor, and an upper support shaft (12) extending in the vehicle body width direction is provided on the upper frame (4), while the crawler frame (5) Provided with a lower support shaft (17) arranged in parallel with the upper support shaft (12),
The upper link arm (6) is pivotally supported on the upper support shaft (12), the lower link arm (7) is pivotally supported on the lower support shaft (17), and the distal ends of both link arms (6, 7) are supported. The parts are connected to each other in a refractive manner at the intermediate shaft (14),
Further, working arms (21, 22) projecting in the front-rear direction project from the upper support shaft (12), and receiving seats (23, 24) are disposed on the upper frame (4).
The crawler frame (5) and the crawler frame (5) are attached to the crawler frame (5) by rotating the working arms (21, 22) together with the upper link arm (6) and bringing them into contact with the seats (23, 24). The swing limit of the crawler is defined .
[0007]
The crawler steady rest apparatus, the upper side link arm and the lower side link arm, the crawler frame and the car body, respectively, and each other, from Rukoto are pinned, the rear axle crawler with respect to the vehicle body The degree of freedom of swinging around the center is ensured. On the other hand, when the crawler receives a torsional moment in a horizontal plane, the torsional operation is restricted by the upper link and the lower link provided between the crawler and the vehicle body.
Further, the working arm rotates together with the upper side link arm and comes into contact with the seat so that the rotation is restricted. The interval between the seat and the working arm is arbitrarily configured, and the swing limit of the crawler frame and the crawler attached to the crawler frame is defined within a desired range.
[0008]
【The invention's effect】
The crawler steadying device of the present invention has the following effects.
Since the crawler steadying device having the above configuration is configured by a swing link in which an upper link and a lower link are pin-coupled, the bearing portion can be easily protected from earth and sand or dust by application of a sealed bearing or the like. Further, even if earth or sand or dust adheres to the swing link, the swinging operation naturally falls from the upper link and the lower link, so that the necessary swing range of the upper link and the lower link is always maintained. Furthermore, regular maintenance of grease and oilless bearings can simplify maintenance. As described above, the crawler steadying device having the above-described configuration can be made maintenance-free as compared with the conventional crawler steadying device using a rectangular regulation frame.
In addition, a working arm projecting in the front-rear direction is provided on the upper support shaft, and a receiving seat is provided on the upper frame, and the working arm is rotated together with the upper link arm to come into contact with the receiving seat. Thus, the swing limit can be defined in the same manner as the conventional rectangular regulation frame that defines the swing limit of the crawler frame and the crawler attached to the crawler frame. Furthermore, there is no part that is easily clogged with mud and dust, and the maintenance-free operation can be maintained.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments specifically configured based on the above technical idea will be described below with reference to the drawings.
First, the basic structure of the crawler support device of the present invention will be described. FIG. 1 is a side view of the main part of the crawler support device of the present invention, FIG. 2 is a view taken along the arrow A in FIG. 1 for the left half of the vehicle body, and FIG. Shown in
[0010]
1 to 3, the crawler support device 1 has an upper frame 4 installed between a transmission case 2 and a rear axle case 3, and an upper side link arm 6 and an upper side link arm 6 between the upper side frame 4 and the crawler frame 5. are those linked by the lower side link arm 7, constitutes for each crawler lateral it.
[0011]
The upper frame 4 is formed such that a square pipe that curves in a substantially arc shape projects outward from the transmission case 2 and reaches the vicinity of the rear rear axle case 3. An L-shaped mounting seat 8 for fastening the bolt to the transmission case 2 is provided at the front end of the upper frame 4. At the rear end, an L-shaped bracket 9 is bolted to the rear axle case 3 and a mounting seat 10 for fastening the bolt to the L-shaped bracket 9 is provided.
A cylindrical bracket 11 is attached to the lower surface of the upper frame 4 at a substantially intermediate position, and a hooked support shaft 12 is fitted and fixed to the bracket 11. The upper side link arm 6 forms a boss 13 that is pivotally supported by inserting a support shaft 12 at one end. Moreover, the boss | hub 15 which inserts the intermediate shaft 14 in the other end part, and is supported is formed. Similarly, the lower side link arm 7 is formed with a boss 16 which is supported by inserting an intermediate shaft 14 at one end portion, and a support shaft 17 with a hook on the crawler frame 5 side is inserted at the other end portion. A pivoting boss 18 is formed. The crawler frame 5 includes a cylindrical bracket 19 that fits and fixes the support shaft 17 on the upper surface near the tip.
[0013]
In the above configuration, the upper side link arm 6 and the lower side link arm 7 are configured to be swingable within a swing plane of the crawler centered on the rear axle 20 that is pivotally supported in the rear axle case 3. That is, the central axes of the support shaft 12 on the upper frame 4 side, the support shaft 17 on the crawler frame 5 side, and the intermediate shaft 14 are defined in the vehicle width direction. The upper side link arm 6 and the lower side link arm 7 are also configured to be swingable within the crawler swing plane. Further, in order to suppress an excessive swinging operation of the upper side link arm 6 and the lower side link arm 7, the support shaft 12 on the upper side frame 4 side and the support shaft 17 on the crawler frame 5 side are substantially omitted from the center of the rear axle 20. Arrange at equidistant positions.
[0014]
The support shaft 12 side of the boss 13 of the upper side link arm 6, projecting the functional arm 21 so as to project in a forward position of the bracket 11, seat 23 as a swing stopper can this functional arm 21 and interference contact Is disposed on the upper frame. Similarly, a working arm 22 is projected so as to protrude to the rear position of the bracket 11, and a receiving seat 24 is disposed as a swing stopper that can interfere with the working arm 22. Seat 23 and 24 is to define the rocking limits of the upper side link arm 6 by regulating the operation of the corresponding functional arm 21. In order to define the rocking limits of the upper side link arm 6, define the shape of the seat 23, 24.
[0015]
Further, the support shaft 17 side of the boss 18 of the lower side link arm 7, to project the functional arm 25 so as to project in a forward position of the bracket 19. Similarly, the action arm 26 protrudes so as to project to the rear position of the bracket 19. These working arms 25 and 26 use the corresponding portions of the crawler frame 5 that can be brought into interference contact as swing stoppers. By determining the shape and angular position of the working arm 25, it is possible to restrict the rocking limits of the lower side link arm 7 in a predetermined range. In the illustrated example, by attaching the lower side link arm 7 upside down, the upper side link arm 6 and the lower side link arm 7 are used as two parts having the same shape, thereby reducing the cost.
[0016]
In the crawler steadying device 1 having the above-described configuration, the upper side link arm 6 and the lower side link arm 7 are respectively pin-coupled to the crawler frame 5 and the vehicle body side upper side frame 4 and to each other. Since the crawler can swing in a swing plane that swings about the rear axle 20, the degree of freedom for the crawler to swing about the rear axle 20 relative to the vehicle body is ensured. On the other hand, when the crawler receives a moment in the horizontal plane and is twisted in the left-right direction, the torsional operation is restricted by the upper side link arm 6 and the lower side link arm 7 provided between the crawler and the vehicle body. The
[0017]
Thus, the crawler steady rest apparatus 1 of the above configuration, since a swinging link structure in which the upper side link arm 6 and the lower link arm 7 to pin bonding, sealing bearings, etc. The bearing unit from sand and dust Can be easily protected. Further, even if earth or sand or dust adheres to the swing link, it naturally falls from the upper side link arm 6 and the lower side link arm 7 by the swinging operation, so the upper side link arm 6 and the lower side link arm 7 are necessary. A stable swing range is always maintained. Furthermore, regular maintenance of grease and oilless bearings can simplify maintenance.
[0018]
Next, the swing stopper of the upper link of the crawler support device will be described in detail. FIG. 4 shows a first configuration example of the stopper of the crawler support device, and FIGS. 5A and 5B show a second configuration example and a third configuration example.
[0019]
In FIG. 4, the seat 23 disposed on the upper frame 4 is attached to its abutment surface so that it can be replaced with bolts using a buffer rubber 31 as a stopper. Similarly, the buffer rubber 32 is attached to the contact surface of the seat 24. Each cushion rubber 31 and 32, defines a swing limit of the upper side link arm 6 and the working arm 21, 22 projecting from the one end of the support shaft 12 side of the boss 13 of the upper side link arm 6 interference contact, While reducing the impact at the time of the contact, the acting force can be dispersed by the wide contact surface. Therefore, an excessive stress load on the upper frame 4 and the like is reduced. Further, it is possible to adjust the swing angle A of the upper side link arm 6, the B separately according to the shape of the cushion rubber 31.
[0020]
Example of FIG. 5 (a), screwed forward and backward adjustable adjustment bolt 33 in threaded holes formed in the functional arm 21 of the upper side link arm 6. Similarly, the adjustment bolt 34 is screwed onto the working arm 22. The screw holes for screwing the adjusting bolts 33 and 34 are arranged at positions facing the receiving seats 23 and 24, and the upper side link arm 6 until the adjusting bolts 33 and 34 come into contact with the receiving seats 23 and 24 by adjusting the screwing. The angle ranges A and B can be changed and adjusted individually.
[0021]
Example of FIG. 5 (b) are those that the action arm 21 of the upper side link arm 6 fitted with rubber buffer 35 with bolts. Similarly, a buffer rubber 36 is attached to the working arm 22. In this case, the configuration is the same as that of the example shown in FIG.
[Brief description of the drawings]
1 is a side view of the main part of the crawler support device of the present invention. FIG. 2 is a view taken along the arrow A in FIG. 1 for the left half of the vehicle body. Figure 4 shows a second example of the swinging stopper in the configuration diagram showing a first example of the swinging stopper in the crawler support device of FIG. 1 and FIG. 5 crawler support device of FIG. 1 (a) and 1, the Fig. 6 is a configuration diagram showing three examples. Fig. 6 is a side view of a crawler equipped with a conventional crawler support device.
DESCRIPTION OF SYMBOLS 1 Crawler support apparatus 2 Transmission case 3 Rear axle case 4 Upper side frame 5 Crawler frame 6 Upper side link arm 7 Lower side link arm 8, 10 Mounting seat 9 L-shaped brackets 11, 19 Brackets 12, 17 Support shafts 13, 18 Boss 14 Intermediate shaft 20 Rear axle 21, 22 Working arm 23, 24 Seat 25, 26 Working arm

Claims (1)

The crawler frame (5) provided on the rear axle (20) and the crawler attached to the crawler frame (5) are restricted from being twisted in the left-right direction, and the crawler frame (5) and the crawler frame (5) around the rear axle (20) In the tractor crawler support device that can swing the crawler attached to the crawler frame (5) ,
An upper frame (4) disposed in the front-rear direction is provided on the vehicle body of the tractor, and an upper support shaft (12) extending in the vehicle body width direction is provided on the upper frame (4), while the crawler frame (5) Provided with a lower support shaft (17) arranged in parallel with the upper support shaft (12),
The upper link arm (6) is pivotally supported on the upper support shaft (12), the lower link arm (7) is pivotally supported on the lower support shaft (17), and the distal ends of both link arms (6, 7) are supported. The parts are connected to each other in a refractive manner at the intermediate shaft (14),
Further, working arms (21, 22) projecting in the front-rear direction project from the upper support shaft (12), and receiving seats (23, 24) are disposed on the upper frame (4).
The crawler frame (5) and the crawler frame (5) are attached to the crawler frame (5) by rotating the working arms (21, 22) together with the upper link arm (6) and bringing them into contact with the seats (23, 24). A crawler support device for a tractor characterized by defining a swing limit of the crawler.

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