JPH0572676U - Idle wheel support structure for crawler type traveling device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an idle wheel support structure for a crawler type traveling device, in which the tension of the crawler can be easily adjusted. [Structure] In the sleeve 2 fixed to the track frame 1,
Shaft 5 of yoke 4 on which idle wheel 3 is mounted from one side
Then, the bolt 8 held by the spring 6 so as to be elastically retractable is inserted from the other side. A cover 9 that covers the spring 6 is provided with a locking portion 10 that prevents the bolt 8 from rotating. [Effect] The idle wheel 3 is pushed out by the bolt 8 elastically held by the spring 6 via the shaft portion 5 of the yoke 4 so as to stretch the crawler. To adjust the position of the idle wheel 3 by rotating the bolt 8, it is only necessary to remove the cover 9, and the tension adjustment of the crawler is easy.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a support structure for an idle wheel for tensioning a crawler in a crawler type traveling device used in a combine or a carrier.

[0002]

[Prior Art]

 In the crawler type traveling device, the tension of the crawler is adjusted by moving the position of the idle wheel with a bolt. The idle wheel is elastically supported by springs and moves so as to release the force when a sudden pulling force is applied to the crawler.

[0003]

[Problems to be solved by the device]

 The idle wheel in the crawler type traveling device has a complicated structure supported by bolts and springs as described above. Also, the spring is covered with a cover so that mud or stones may not get caught and malfunction. For this reason, when the crawler extends to adjust the position of the idle wheel, the spring cover is removed, the lock nut of the bolt is loosened, and the bolt is rotated, but this work is troublesome.

[0004]

[Means for Solving the Problems]

 Therefore, in the present invention, the sleeve 2 is fixed to the track frame 1, the shaft portion 5 of the yoke 4 on which the idle wheel 3 is mounted is fitted from one side of the sleeve 2, and the spring 6 repels the sleeve 2 toward the sleeve 2. The tip of the bolt 8 screwed into the spring fitting 7 that is attached by fitting is fitted from the other side of the sleeve 2 and abuts against the end of the shaft portion 5 of the yoke 4, and the cover 9 covering the spring 6 is locked to prevent rotation of the bolt 8 The portion 10 is formed to provide an idle wheel supporting structure for a crawler type traveling device.

[0005]

[Operation and effect of the device]

 By rotating the bolt 6, the protruding length of the tip of the bolt 6 from the spring fitting 7 changes, and the tip of the bolt 6 abuts the shaft portion 5 of the yoke 4, so the position of the idle wheel 3 changes. The tension with which the idle wheel 3 stretches the crawler is determined by the elastic force of the spring 8 acting on the spring fitting 7. If the cover 9 that covers the spring 8 is attached after adjusting the position of the idle wheel 3, the detent locking portion 10 formed on the cover 9 engages the bolt 6 and prevents the bolt 6 from loosening. As described above, since the cover 9 has the locking portion 10 for preventing the bolt 6 from rotating, the bolt 6 can be immediately rotated to adjust the position of the idle wheel 3 only by removing the cover 9, so that the adjustment work can be performed quickly. It will be.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. The track frame 1 is constructed by arranging U-shaped frames in cross section, and idle wheels 11 whose positions are fixed are pivotally supported at predetermined intervals in the longitudinal direction so as to be sandwiched between the frames. The sleeve 2 is fixed to the upper side of the track frame 1 by mounting brackets 12 and 13 in the longitudinal direction.

A shaft portion 5 of a yoke 4 which pivotally supports an idle wheel 3 is fitted into the sleeve 2. On the side of the mounting bracket 12 opposite to the side on which the sleeve 2 is mounted, sandwich the compression spring 6 with two spring brackets 7, 14 so that both spring brackets 7, 14 and the mounting bracket 12 are penetrated. The spring receiving metal fitting 7 is attached to the mounting metal fitting 12 side in a pressed state with the bolts 15 and 16 on both sides.

A female screw is provided in the center of one spring receiving metal fitting 7, a hole is provided in the center of the other spring receiving metal fitting 14, and a bolt 8 is screwed through both spring receiving metal fittings 7, 14. The tip thereof is inserted into the sleeve 2 and is in contact with the end surface of the shaft portion 5 of the yoke 4. A cover 9 is attached to the spring receiving metal fitting 14 with screws 17 so as to cover the spring 6 and the like from above. The cover 9 has a U-shaped groove with a width that sandwiches the facing surface of the hexagonal head portion of the bolt 8 and serves as a detent locking portion.

A plurality of crawlers 20 are wound around an idle wheel 11 fixed to the track frame 1 and an idle wheel 3 which is movable. Reference numeral 19 is a guide for receiving the inside of the crawler 20. The embodiment shown in FIGS. 3 and 4 is in a state in which the spring receiving member 7 is held by a plurality of compression springs 21, 22, 23, 24.

When adjusting the position of the idle wheel 3, the cover 9 is removed and the bolt 8 is rotated. In order to adjust the force with which the idle wheel 3 stretches the crawler 20, the nuts 25 and 26 screwed to the bolts 15 and 16 are turned to adjust the force with which the spring receiving member 7 of the spring 6 is elastically pushed.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment.

FIG. 2 is a plan sectional view of the first embodiment.

FIG. 3 is a front view of the second embodiment.

FIG. 4 is a plan view of the first embodiment.

[Explanation of symbols]

 1 Track Frame 2 Sleeve 3 Idle Wheel 4 Yoke 5 Shaft 6 Spring 7 Spring Receiving Metal Fitting 8 Bolt 9 Cover 10 Rotation Stopper

Claims (1)

[Scope of utility model registration request] 1. A sleeve (2) is fixed to a track frame (1), and a shaft portion (5) of a yoke (4) on which an idle wheel (3) is mounted is fitted from one side of the sleeve (2), A bolt (8) screwed to a spring fitting (7) which is elastically attached to the sleeve (2) by a spring (6).
Of the bolt (8) is locked to the cover (9) that covers the spring (6) by fitting the tip of the other end of the sleeve (2) into contact with the end of the shaft (5) of the yoke (4). Division (10)
The idle wheel support structure of the crawler type traveling device formed by forming the.