Thrust wheel and crawler walking equipment

Abstract

The utility model relates to a thrust wheel and provides a thrust wheel and crawler walking equipment in order to solve the problem that abrasion between a lining and an end cover of an existing thrust wheel is serious. The thrust wheel comprises a wheel shaft, bushings, a wheel body, end covers and sealing pieces, wherein the bushings and the wheel body are arranged on the wheel shaft in a sleeving mode, the end covers are fixed to the two ends of the wheel shaft and used for limiting the wheel body, the sealing pieces are arranged between the axial end face of the wheel body and the inner side faces of the end covers, and an axial thrust device is installed between the inner side face of each end cover and the end face of the adjacent bushing. The axial thrust device comprises a retainer annularly arranged on the axle in a sleeving mode and a plurality of balls installed on the retainer in a rolling mode, and the balls abut against the inner side face of the end cover and the end face of the bush at the same time. According to the thrust wheel, the balls are arranged between the end covers and the bushings, so that rolling friction exists between the end covers and the bushings, abrasion of the bushings is reduced, and the service life of the thrust wheel is prolonged.

Description

Technical Field

[0001] This utility model relates to a support roller, and more specifically, to a support roller and tracked walking device. Background Technology

[0002] Tracked walking equipment, such as tracked excavators and tracked cranes, has multiple support rollers installed under the track beams to support the tracks.

[0003] The support roller includes an axle, a wheel body mounted on the axle, end caps fixedly mounted on both ends of the axle to axially limit the wheel body, a bushing between the inner hole of the wheel body and the axle, a sealing ring between the end cap and the axial end face of the wheel body, and lubricating grease filling the space formed by the wheel body, axle, and end cap.

[0004] Under lateral force, the inner end face of the end cap of the existing track roller contacts the end face of the bushing and rotates relative to it under the drive of the track. The sliding friction generated by the relative rotation between the bushing and the end cap produces a lot of heat, causing the internal temperature of the roller body to rise. When the temperature exceeds the allowable operating temperature range of the floating seal ring, the seal ring hardens and loses its elasticity, resulting in oil leakage from the track roller body.

[0005] The sliding friction between the bushing and the end cap easily produces metal shavings that mix with the lubricating oil, causing contamination. The end cap is not heat-treated, has low hardness, and is extremely prone to wear. Excessive wear will increase the axial movement of the wheel, exceeding the elastic compensation range of the seal ring, causing gaps at the floating oil seal and resulting in oil leakage. Utility Model Content

[0006] The technical problem to be solved by this utility model is the severe wear between the bushing and end cap of the existing track roller, and provides a track roller and track walking device to reduce the wear between the bushing and end cap of the track roller.

[0007] The technical solution of this utility model to achieve its purpose is: a support roller, including a wheel axle, a bushing and a wheel body fitted on the wheel axle, end caps fixed at both ends of the wheel axle for limiting the wheel body, and a sealing element disposed between the axial end face of the wheel body and the inner side of the end cap. An axial thrust device is installed between the inner side of each end cap and the end face of the adjacent bushing. The axial thrust device includes a retainer ring fitted on the wheel axle and a plurality of balls rolled on the retainer. Each ball simultaneously abuts against the inner side of the end cap and the end face of the bushing.

[0008] In this utility model support roller, an annular raceway for cooperating with the ball bearing is provided on the inner side of the end cap, and the annular raceway is arranged concentrically with the wheel axle.

[0009] The retaining cage comprises an inner ring and an outer ring arranged concentrically, and each of the balls is arranged between the inner ring and the outer ring.

[0010] The inner ring and the outer ring are in the form of a round bracket.

[0011] The inner ring and the outer ring have a spherical surface recess adapted to the ball at the part where the ball is arranged.

[0012] Each of the balls is arranged on the retaining cage in a circumferential uniform interval.

[0013] The end surface of the bushing in contact with the ball does not have a sintered copper layer.

[0014] The bushing and the end cover have a quench-hardened layer structure at the end surface in contact with the ball.

[0015] The sealing member comprises a floating ring and a sealing ring matched with the floating ring, and the axial thrust device is arranged on the radially inner side of the sealing member.

[0016] The technical scheme for realizing the purpose of the utility model is: a tracked walking device, wherein the tracked walking device is provided with the supporting wheel.

[0017] Compared with the prior art, the utility model has the advantages that: in the supporting wheel, the ball is arranged between the end cover and the bushing, so that the rolling friction is formed between the end cover and the bushing, thereby reducing the wear of the bushing and prolonging the service life of the supporting wheel. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is an exploded schematic view of the supporting wheel of the utility model.

[0019] Figure 2 is a sectional schematic view of the supporting wheel of the utility model.

[0020] Figure 3 is Figure 2 is a local enlarged view of A in the figure.

[0021] Figure 4 is a structural schematic view of the axial thrust device in the supporting wheel of the utility model.

[0022] Figure 5 is a front view of the axial thrust device

[0023] Figure 6 is Figure 5 is a local enlarged view of B-B section in the figure.

[0024] Component names and serial numbers in the diagram:

[0025] 1. Wheel body, 2. Axle, 3. End cover, 4. Axial thrust device, 5. End cover fixing pin, 6. Seal, 7. Bushing.

[0026] Circular raceway 31, cage 41, inner ring 411, outer ring 412, ball 42, seal 6, floating ring 61, sealing ring 62. Detailed Implementation

[0027] The specific implementation plan is described below with reference to the attached diagram.

[0028] like Figure 1 As shown, the support roller includes an axle 2, a bushing 7 fitted on the axle 2, a wheel body 1, end caps 3 fixed at both ends of the axle 2 for limiting the wheel body, and a seal 6 disposed between the axial end face of the wheel body 1 and the inner side of the end cap 3. An axial thrust device 4 is installed between the inner side of the end cap 3 at each end and the end face of the adjacent bushing 7. The axial thrust device 4 includes a retainer 41 ring-fitted on the axle and multiple balls 42 rolled on the retainer 41. Each ball 42 simultaneously abuts against the inner side of the end cap 3 and the end face of the bushing 7. The axial thrust device 4 is arranged radially inside the seal 6.

[0029] like Figure 2 Figure 3 As shown, bushing 7 and wheel body 1 are mounted on axle 2. Bushing 7 is fixed in the inner hole of wheel body 1 and rotates with wheel body 1.

[0030] End caps 3 are installed at both ends of the axle 2. The end caps 3 are fitted onto the axle 2 and are fixedly connected to the axle 2 by end cap fixing pins 5, and are fixed relative to the axle 2. When the wheel body 1 rotates, the wheel body 1 rotates relative to the end caps 3.

[0031] A sealing element 6 is provided between the end cap 3 and the wheel body 1 at each end. The sealing element 6 includes a floating ring 61 and a sealing ring 62 that mates with the floating ring 61. The floating ring 61 includes a stationary floating ring that mates with the end cap 3 and a movable floating ring that mates with the end of the wheel body 1. The stationary floating ring and the movable floating ring each mate with a sealing ring 62 to form a seal. A stationary sealing ring is provided between the inner hole of the end cap 3 and the wheel axle 2. The stationary sealing ring, the sealing element 6, the end cap 3, the wheel body 1, and the wheel axle 2 form a closed sealing space. This space is filled with lubricating grease to lubricate the relatively sliding components between the wheel axle 2, the wheel body 1, the bushing 7, and the end cap 3.

[0032] like Figure 4 to Figure 6As shown, the cage 41 comprises an inner ring 411 and an outer ring 412 arranged concentrically, and each ball 42 is arranged between the inner ring 411 and the outer ring 412. The inner ring 411 and the outer ring 412 are in the shape of a round bracket, and the inner ring 411 and the outer ring 412 form a space for accommodating the balls 42. Further, the balls 42 are arranged on the cage 41 in a circumferential uniform manner, and the inner ring 411 and the outer ring 412 are provided with spherical recesses matching the balls at the positions where the balls 42 are arranged. The spherical recesses on the inner ring 411 and the outer ring 412 position and limit the balls 42, and the balls 42 roll in the space formed by the spherical recesses. The balls 42 are in contact with the end face of the bushing 7 and the inner end face of the end cap 3, and when the wheel body 1 rotates, the balls 42 roll in the space formed by the end face of the bushing 7, the end cap 3, the inner ring 411 and the outer ring 412.

[0033] Further, as shown, Figure 3 The inner end face of the end cap 3 is provided with a circular annular raceway 31 for cooperating with the balls 42, and the circular annular raceway 31 is arranged concentrically with the axle 2. The balls 42 roll in the circular annular raceway 31, and the circular annular raceway 31 is used for radially positioning the axial thrust device 4 to avoid radial deviation of the axial thrust device 4.

[0034] Further, the end face of the bushing 7 in contact with the balls 42 is not provided with a sintered copper layer. The end faces of the bushing 7 and the end cap 3 in contact with the balls 42 are provided with a quenched hardening layer structure. The sintered copper layer is easy to produce debris during friction, and in the present embodiment, the sintered copper layer is not provided, and the hardness of the bushing and the end cap is improved by quenching to improve the wear resistance.

[0035] The present embodiment also provides a tracked walking device, wherein the track beam of the tracked walking device is provided with the support wheel described above. The tracked walking device can be a tracked excavator, a bulldozer, a tracked crane, etc.

[0036] In the present embodiment, the balls are arranged between the end cap and the bushing of the support wheel, so that the rolling friction is formed between the end cap and the bushing, thereby reducing the wear of the bushing and prolonging the service life of the support wheel.

Claims

1. A bearing wheel comprising a wheel shaft, a bushing fitted on the wheel shaft and a wheel body, end covers fixed at both ends of the wheel shaft for limiting the wheel body, and a seal provided between the axial end surface of the wheel body and the inner side surface of the end cover, characterized in that, An axial thrust device is mounted between the inner side of each end cap and the end face of the adjacent bushing, the axial thrust device comprising a cage that is fitted around the axle, a plurality of balls that are rollingly mounted on the cage, each ball simultaneously abutting against the inner side of the end cap and the end face of the bushing.

2. The wheel set according to claim 1, characterized in that A circular ring-shaped raceway for cooperating with the balls is provided on the inner side of the end cap, the circular ring-shaped raceway being concentrically arranged with the axle.

3. The wheel according to claim 1 or 2, characterized in that The cage comprises an inner ring and an outer ring that are concentrically arranged, each ball being arranged between the inner ring and the outer ring.

4. The wheel set according to claim 3, characterized in that The cross section of the inner ring and the outer ring is in the shape of a round bracket.

5. The wheel set according to claim 4, characterized in that The inner ring and the outer ring have a spherical concave at the position where the balls are arranged, the spherical concave being adapted to the balls.

6. The wheel according to claim 4 or 5, characterized in that Each ball is arranged on the cage in a circumferentially uniform interval.

7. The wheel of claim 1, wherein The end face of the bushing that is in contact with the balls does not have a sintered copper layer.

8. The wheel set according to claim 7, characterized in that The end face of the bushing and the end face of the end cap that are in contact with the balls have a quenched hardening layer structure.

9. The wheel of claim 1, wherein, The seal comprises a floating ring and a sealing ring that cooperates with the floating ring, the axial thrust device being arranged radially inside the seal.

10. A tracklaying vehicle characterized by comprising: The track beam is provided with the thrust wheel according to any one of claims 1 to 9.

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