JPH08150972A - Crawler traveling device - Google Patents

Abstract

PURPOSE: To improve workability at maintenance time of the periphery of an extensible-contractible mechanism and the extensible-contractible mechanism itself by simply disassembling the extensible-contractible mechanism. CONSTITUTION: A tension wheel 19 is installed in an end part of a truck frame 17 through an extensible-contractible mechanism 26 so that a longitudinal position can be freely changed and adjusted, and when the extensible contractible mechanism 26 is constituted, a support frame 27 is arranged, and a guide member 28 to slidingly guide the support frame 27 is erected on the truck frame 17, and a hydraulic cylinder 30 is arranged to slidingly drive the support frame 27 by pressing an end part of the support frame 27 by a piston rod 30b in a condition where a base end part of a cylinder tube 30a is supported by a support wall 29. Therefore, the support frame 27, the hydraulic cylinder 30 and the support wall 29 arranged in series to each other are brought into contact with each other from the longitudinal direction, and are constituted so as to mutually support mutual reaction, and opposing end parts of the support frame 27 and the hydraulic cylinder 30 are engaged with each other from the longitudinal direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a tension frame attached to the end of a track frame so as to adjust the front-rear position via an expansion / contraction mechanism for adjusting the tension of a crawler belt. A support frame that supports the tension wheels is provided at the front and rear outer ends in a posture along the track frame, and a guide member that slides and guides the support frame forward and backward is erected on the track frame. A support wall is erected on the front and rear inner side of the guide member, and while the base end of the cylinder tube is supported by the support wall, the front and rear inner ends of the support frame are pressed by the piston rod. In addition, the present invention relates to a crawler traveling device provided with a hydraulic cylinder for slidingly driving the support frame.

[0002]

2. Description of the Related Art Conventionally, in the above-mentioned crawler traveling device, a supporting frame, a hydraulic cylinder, and a supporting wall, which are arranged in series, are brought into contact with each other from the front-rear direction, and the opposite ends of the supporting frame and the hydraulic cylinder are opposed to each other. It was bolted.

[0003]

According to the above-mentioned conventional structure, the opposite ends of the support frame and the hydraulic cylinder are bolted to each other. Therefore, for example, during maintenance of the expansion / contraction mechanism or the expansion / contraction mechanism itself. Had to release the bolt connection between the opposing ends of the support frame and the hydraulic cylinder, and the releasing operation took time, and there was room for improvement in terms of workability.

The present invention has been made in view of the above situation, and an object thereof is to improve workability around maintenance of the expansion mechanism and the expansion mechanism itself.

[0005]

A characteristic configuration of the present invention is that the supporting frame, the hydraulic cylinder, and the supporting wall arranged in series are brought into contact with each other in the front-rear direction so as to support each other's reaction forces. In addition to the above, the support frame and the opposed ends of the hydraulic cylinder are engaged with each other in the front-rear direction.

[0006]

With the above-mentioned structure, for maintenance of the expansion / contraction mechanism and the expansion / contraction mechanism itself, for example, the piston rod of the hydraulic cylinder is retracted to release the pressing of the support frame by the piston rod. Thus, the expansion and contraction mechanism can be disassembled by separating the support frame and the hydraulic cylinder, and the maintenance can be easily performed.

[0007]

As described above, since the telescopic mechanism can be easily disassembled, the workability around the telescopic mechanism and during maintenance of the telescopic mechanism itself can be improved.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 6, the reaper 2 is connected to the front part of the traveling vehicle equipped with the crawler traveling device 1 on the left and right sides so that it can be moved up and down. Combines are configured.

As shown in FIGS. 1 (a), 1 (b) and 2, the body frame 10 is formed in a lattice by connecting a pair of left and right main frames 4 along the front-rear direction with a plurality of cross frames 5. There is. Then, the hydraulic motors M are attached to a pair of motor attachment portions 5a formed by extending both end portions of the cross frame 5 on the rear side of the machine body to the left and right outer sides of the main frame 4, respectively, and the hydraulic motors M are attached to each other. The drive wheels 12 are connected to the hydraulic motor M so that the pair of drive wheels 12 can be independently driven by the pair of hydraulic motors M.

The track frame 17 in the crawler traveling device 1 is equipped with a plurality of grounding wheels 18 at its intermediate portion and a tension wheel 19 at its front end portion. 15, 16
It is supported so as to be movable up and down relative to each other. At the extended end of the cross frame 5 on the rear side of the fuselage, a track frame 17 that rises relatively to the left and right outer sides of the motor mounting portion 5a is provided on the left and right outer sides of the motor mounting portion 5a. And a pair of restricting portions 5b for restricting the upper limit of the vertical stroke of the track frame 17 are separately formed. FIG. 1A shows a state in which the track frame 17 that has been relatively raised is received by the restricting portion 5b and the upper limit of the vertical stroke of the track frame 17 is restricted.

A structure for supporting the track frame 17 by the vehicle body frame 10 will be described. A pair of front and rear first support shafts 13 and 14 are rotatably supported by the main frame 4 of the vehicle body frame 10, and both first support shafts are rotatably supported. At the outer ends of the shafts 13 and 14, swing links 15 are provided in the forward direction of the machine,
The rear end of 16 is fixed. The front ends of the pair of swing links 15 and 16 are fixed to a pair of front and rear second support shafts 7 and 8 that are rotatably supported by the track frame 17. Actuating arms 21 and 22 are fixed to the inner ends of both the first support shafts 13 and 14, respectively, and the actuating arm 22 on the front side and the cross frame 5 on the vehicle body frame 10 side are fixed.
A first hydraulic cylinder 23 is installed to extend over. Further, the connecting rod 25 is provided across both the operating arms 21 and 22.
Has been erected.

With the above structure, the first hydraulic cylinder 23
When the operation arm 22 on the front side is rockably driven by expanding and contracting, the linking rod 25 simultaneously drives the rocking arm 21 on the rear side, and the rocking links 15 and 16 integrated with the working arms 21 and 22 move up and down. Swing (Fig. 1 (a),
(See (b)). As a result, the entire track frame 17 can be moved up and down in parallel, and by performing this operation in the left and right crawler traveling devices 1, the vehicle body can be moved up and down in parallel and the lateral inclination can be corrected.

As shown in FIGS. 3 (a) and 3 (b), the tension wheel 19 is supported by the support bracket 24, and the extension / contraction mechanism 26 for adjusting the tension of the crawler belt B is used. It is attached to 17 so that the front and rear position can be adjusted.

The extension mechanism 26 is the track frame 1
A support frame 27 made of a square pipe for supporting the support bracket 24 of the tension wheel 19 is provided at the front and rear outer ends in a posture along 7 and a gate-shaped guide member for slidingly guiding the support frame 27 back and forth. 28 is erected on the track frame 17, and the guide member 2 of the track frame 17 is provided.
A U-shaped support wall 29 in a plan view is erected on the front and rear inner sides of the cylinder tube 8 by the support wall 29.
The second hydraulic cylinder 30 that slides the support frame 27 by pressing the front and rear inner ends of the support frame 27 with the piston rod 30b while the base end of the support frame 27 is supported.
Is provided and configured. The second hydraulic cylinder 30 has a grease inlet 38 on the base end side of the cylinder tube 30a.
The operator injects grease from the grease inlet 38 into the cylinder tube 30a to drive the piston rod 30b to extend.

The support frame 27, the second hydraulic cylinder 30, and the support wall 29 are arranged in series, and are constructed so as to support each other's reaction forces by abutting against each other in the front-back direction. 27 and the opposing ends of the piston rod 30b of the second hydraulic cylinder 30 are engaged with each other in the front-rear direction. Between the front and rear inner ends of the support frame 27 and the piston rod 30b, one end is fitted into the front and rear inner end of the support frame 27, and the other end is fitted to the piston rod 30b. Tension metal fittings 36 to be externally fitted to the end portions of are intervened. The second hydraulic cylinder 30 is fixed to the track frame 17 with a band 37 (see FIG. 4).

Since the expansion / contraction mechanism 26 is constructed in this manner, when maintenance around the expansion / contraction mechanism 26 is performed, the piston rod 30b is retracted by removing grease from the second hydraulic cylinder 30, and is supported by the piston rod 30b. By simply releasing the pressing of the frame 27, the support frame 27 and the second hydraulic cylinder 30 can be separated, and the telescopic mechanism 26 can be easily disassembled, and maintenance of the telescopic mechanism 26 and the telescopic mechanism 26 itself can be easily performed. It can be carried out.

Support bracket 2 for the tension wheel 19
4 is formed separately from the expansion / contraction mechanism 26, and is detachably attached to the expansion / contraction mechanism 26. More specifically, as shown in FIG. It comprises a left side bracket 24a and a right side bracket 24b which are axially supported and can be attached to and detached from the support frame 27 via bolts A separately.

A floating seal 31 is interposed between the tension wheel 19 and the left and right brackets 24a and 24b. In this floating seal 31, a pair of metal rings 32, whose rising peripheral edge portions 32a are butted against each other, are arranged so as to cover the rotating shaft 33 of the tension wheel 19, and the inner peripheral portion of the bearing mounting boss 34 of the tension wheel 19 is arranged. A ring-shaped rubber member 35 provided on the inner portions of the left and right brackets 24a and 24b presses the back portions of the rising peripheral edge portions 32a of the pair of metal rings 32 to surround both metal rings 32. It is constructed so that it can move freely in any direction.

As described above, since the support bracket 24 for the tension wheel is formed separately from the expansion / contraction mechanism 26 and is detachably attached to the expansion / contraction mechanism 26, for example, when the crawler belt B is replaced. And the crawler belt B
The left bracket 24a or the right bracket 24 of the support bracket 24 is used for maintenance requiring removal.
The crawler belt B can be easily removed only by performing a simple operation of removing b from the support frame 27.

[Other Embodiments] As shown in FIG. 7, in the support wall 29, a bolt insertion hole 39 is formed at the base end of a bracket having ribs and having an L shape in a side view, and the track frame 17 is formed. It may be detachably attached via a bolt 40. According to this structure, the second hydraulic cylinder 30
It is only necessary to release the support wall 29 from the track frame 17 by releasing the fixing by the bolt 40 without retracting the piston rod 30b of
The hydraulic cylinder 30 can be separated, and the expansion mechanism 26
Can be more easily disassembled.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1A is a side view of a crawler traveling device in which a vehicle body frame is in a low state. FIG. 1B is a side view of a crawler traveling device in which a vehicle body frame is in a high state.

FIG. 2 is a plan view of a crawler traveling device.

FIG. 3 (a) Side view around the expansion / contraction mechanism for adjusting the tension of the crawler belt. (B) Side view showing the disassembled state of the expansion / contraction mechanism for adjusting the tension of the crawler belt.

FIG. 4 is a rear view of a longitudinal section of a telescopic mechanism for adjusting the tension of a crawler belt.

FIG. 5 is a cross-sectional plan view of a support bracket.

FIG. 6 is an overall side view of the combine.

FIG. 7 is a partially cutaway side view of another embodiment.

[Explanation of symbols]

 17 Track Frame 19 Tension Wheel 24 Support Bracket 26 Expansion Mechanism 28 Guide Member 29 Support Wall 30 Hydraulic Cylinder 30a Cylinder Tube 30b Piston Rod B Crawler Belt

Claims (1)

[Claims] 1. A tension wheel (19) is attached to an end of a track frame (17) so as to be adjustable in front-rear position change through an expansion / contraction mechanism (26) for adjusting tension of a crawler belt (B). (26) comprises a support frame (27) for supporting the tension wheel (19) at the front and rear outer ends in a posture along the track frame (17), and the support frame (27) is provided. A guide member (28) that slides back and forth is erected on the track frame (17), and a support wall (29) is erected on a front and rear inner side portion of the track frame (17) with respect to the guide member (28). With the support wall (29) supporting the base end of the cylinder tube (30a), the front and rear inner ends of the support frame (27) are pressed by the piston rod (30b). The supporting frame (27)
A crawler traveling device provided with a hydraulic cylinder (30) for slidingly driving the above, wherein the supporting frame (27), the hydraulic cylinder (30) and the supporting wall (29) arranged in series are contacted with each other in the front-back direction. The crawler traveling device is configured so as to support each other's reaction forces, and the opposite ends of the support frame (27) and the hydraulic cylinder (30) are engaged with each other in the front-rear direction.