JPH0564085U - Movable roller support structure for crawlers - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the followability of the movable rollers of the crawler traveling device and the crawler guide function. [Structure] An equalizer type swing arm 12 is rotatably supported on a track frame 3, and movable roller wheels 14, 14 rollingly contacting inner circumferences of both sides of a crawler core metal 31 are rotatably supported on both ends of the track frame 3 separately. A notch 33 is provided at the upper limit position for raising the wheel axle 16 to increase the swing amount of the swing arm 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a support structure for movable wheels for crawlers in a combine or transportation having a crawler traveling portion.

[0002]

[Prior Art]

 Conventionally, for example, a lower movable wheel for guiding the crawler during traveling in a crawler traveling part of a carrier vehicle is pivotally supported at both ends of an equalizer type swing arm to smoothly move the center of gravity when crossing a ridge. A device disclosed in Japanese Utility Model Laid-Open No. 48-1131136 is known, and in the present invention, a swinging of the swing arm is provided by providing a track frame for supporting the swing arm with a notch hole for accommodating a raised wheel. It is designed to increase the amount of movement. When the crawler guide rollers are inscribed at the center of the crawler, in order to avoid contact vibration with the drive sprocket engagement hole, use a structure that inscribes on both sides of the cored bar. In this case, however, a swing arm is provided with a housing for supporting the rolling wheels to rotatably support the rolling wheel shaft, and the structure in which the rolling wheels are fixedly fitted to both ends of the rolling wheel shaft is used. ..

[0003]

[Problems to be solved by the device]

 However, when supporting the rolling wheels as described above, the swing arm's swinging amount with respect to the track frame is small due to the large diameter of the swing arm's bearing portion, so the swing arm's function may not be fully fulfilled. Also, if the left and right wheels are fixed on the shaft, if the peripheral speed difference between the left and right wheels occurs due to the adhesion of soil to the inner surface of the crawler, the running resistance increases due to the rotation resistance between the wheels. In addition, there is a problem that the contact surfaces between the rolling wheels or between the rolling wheels and the shaft peripheral surface are worn. This invention intends to provide a roller support structure that solves these problems.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the rolling wheel support structure of the present invention is such that an equalizer type swing arm 12 whose front and rear ends swing up and down in the inner circumference of the crawler 8 is pivotally supported on the track frame 3 side. On the swinging end side of the swing arm 12, the movable wheel 14 is pivotally supported so as to be inscribed and rotated on both inner circumferences of the core metal 31 of the crawler 8, respectively, and the wheel shaft 16 of the movable wheel 14 is swung on the swing arm. It is characterized in that it is fixedly mounted on the track frame 12, and a notch 33 for increasing the swing amount of the swing arm 12 is provided at a position corresponding to the swing upper limit of the wheel shaft 16 on the track frame 3 side.

[0005]

[Action]

 Since the movable rollers 14, 14 rotate separately at both ends of the roller shaft 16, resistance or friction due to the difference in rotation does not occur between the rollers 14, 14. Further, since the notch 33 of the track frame 3 at the raised position of the roller shaft 16 raises the upper limit position for raising the roller shaft 6, the swinging amount of the swing arm 12 also increases, and the movable roller 14 moves with respect to the unevenness of the road surface. The followability is improved, and it is possible to more reliably prevent tilting of the aircraft and sudden changes in the center of gravity during traveling.

[0006]

【Example】

 1 to 4 show a first embodiment of the present invention, in which a left and right track frame 3 for mounting a crawler traveling section 2 is mounted under a machine frame 1 such as a combine and the like. At the front and rear ends, a drive sprocket 6 and an idle roller 7, which are pivotally supported on the transmission 4 side, are pivotally supported, and a crawler 8 is wound around. A large number of lower fixed rollers 9 are supported on the lower side of the track frame 4, and an upper fixed roller 11 is supported on the upper side of the track frame 4 so as to be in rolling contact with the inner circumference of the crawler 8. Further, an equalizer type swing arm 12 is swingably supported by an arm shaft 13 below a position near the center of gravity of the track frame 3, and a lower movable roller 14 is provided with a lower movable roller 14 at the front and rear ends of the swing arm 12. Is rotatably supported on the inner circumference of the crawler 8.

The track frame 3 has a channel-shaped cross section with an open lower part, and a horizontal reinforcing rib 7 is fixed inside. A bearing portion 18 composed of a U-shaped notch is formed on both lower end walls of the front and rear center position of the track frame 3, and an arm shaft 13 is detachably accommodated in the bearing portion 18 by a nut 21. At the same time, the swing arm 12 is swingably supported on the arm shaft 13 in the track frame 3 via a bearing 22, a bush 23, and an oil seal 24.

Rolling wheel shafts 16 are fixedly inserted in the left and right directions at the front and rear ends of the swing arm 12, and the rolling wheels 14 are respectively provided at the left and right protruding ends of the rolling wheel shafts 16, and the bearings 27 and the oil are provided in the rolling wheel boss 26. The seal 28, the seal cap 29, etc. are accommodated and are rotatably supported by the left and right respectively. Each of the rolling wheels 14 is in rolling contact with both inner peripheral surfaces of the cored bar 31 of the crawler 8, and the bottom of the swing arm 12 prevents the crawler housed in the front-back direction between the two rows of cored bars 31, 31 from coming off. The guide 32 can be attached integrally.

As shown in FIGS. 2 and 4, the wheel 16 is located in the cutouts 33, 33 formed at the lower end of the track frame, and each cutout 33 is raised to the vicinity of the lower surface of the reinforcing rib 17. Since the swing arm 12 of the equalizer type is formed, the front movable roller 14 rides on the convex portion when the body crosses the ridge, and the roller shaft 16 is placed on the upper surface of the notch 33 as shown in FIG. The aircraft itself does not make a large tilting motion due to a large amount of rocking until it abuts, or just before the abutment, and it does not move a large center of gravity and crosses the ridge.

FIG. 5 shows that the crawler disengagement prevention guides 32a and 32b are attached by bolts 35 along both lower end surfaces of the swing arm 12 by a bolt 35 so that the detachment replacement guide can be easily attached and detached when worn. It was done.

FIG. 6 shows another example of the swing arm 12 provided with the disengagement prevention guides 32a and 32b. In this example, the wheel axle 16 is formed into a U-shaped cutout portion 34 which is recessed at the upper ends of both ends of the swing arm 12. An example in which they are housed and fixed is shown, and the fixing structure of the roller shaft 6 is simplified.

[0012]

[Effect of the device]

 According to the rolling wheel support structure of the present invention configured as described above, since the rolling wheels on both sides of the core metal are rotatably supported separately, the rolling wheels and rolling wheels can be rotated even if there is a difference in rotation between the left and right rolling wheels. The inner surface of the wheel axle or the crawler is prevented from being worn and the load is not increased. In addition, the equalizer type arm that supports the rolling wheels has a large swing range due to the notch at the position corresponding to the wheel shaft ascent on the track frame side, and the crawlability of the crawler due to the rolling wheels is good when traveling on uneven road surfaces. There is an advantage that the guide is also conducted smoothly.

[Brief description of drawings]

FIG. 1 is an overall side view of a crawler traveling unit.

FIG. 2 is an enlarged side view of an equalizer type swing arm.

FIG. 3 is a sectional view of a swing arm in a mounted state.

FIG. 4 is a cross-sectional view of a movable wheel attached state.

FIG. 5 is a sectional view of a swing arm showing another embodiment.

FIG. 6 is an enlarged side view of a swing arm and a crawler detachment prevention guide showing another embodiment.

[Explanation of symbols]

 3 Track Frame 8 Crawler 12 Swing Arm 14 Movable Rolling Wheel 16 Rolling Wheel Shaft 31 Core Bar 33 Notch

Claims (1)

[Scope of utility model registration request] 1. An equalizer type swing arm (1) in which both front and rear ends swing vertically in an inner peripheral portion of a crawler (8).
2) is pivotally supported on the side of the track frame (3), and the swing end side of the swing arm (12) is inscribed and rotated on both inner sides of the core metal (31) of the crawler (8). The movable roller wheel (14) is rotatably supported on the swing arm (12) and the roller shaft (16) of the movable roller wheel (14) is fixedly attached to the swing arm (12).
A support structure for a movable roller wheel for a crawler, which is provided with a notch (33) for increasing a swing amount of a swing arm (12) at a position corresponding to a swing upper limit.