Thrust wheel with combined sealing structure

Abstract

The utility model discloses a thrust wheel with a combined sealing structure. The thrust wheel comprises a wheel body, a wheel shaft, a shaft seat and a shaft sleeve, the two end faces of the wheel body are each provided with an annular step structure, each annular step structure is provided with a first step face, and a non-compensation ring is arranged on each first step face. A first annular sealing groove is formed in the end face, facing the wheel body, of the shaft seat, a compensation ring is arranged in the first annular sealing groove, the sealing end face of the compensation ring abuts against the sealing end face of the non-compensation ring, a spring is arranged between the compensation ring and the bottom of the first annular sealing groove, and the spring is used for providing axial pressure to compensate for abrasion of the sealing end face of the compensation ring. The spring is arranged to compensate the abrasion of the sealing end face of the compensation ring, compared with a floating sealing structure, the spring does not age like a floating sealing rubber ring after working at high temperature for a long time, and therefore the spring can provide enough axial pressure for a long time to guarantee the sealing effectiveness, the reliability of the thrust wheel is improved, and the service life of the thrust wheel is prolonged. And the occurrence of oil leakage is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of excavator carrier rollers, in particular to a carrier roller with a combined sealing structure. Background Art

[0002] As an important component of the traveling mechanism of crawler construction machinery, the main function of the carrier roller is to support the weight of the whole machine, which requires high reliability.

[0003] At present, the sealing structure on the carrier roller mostly uses a floating oil seal structure. This seal is composed of a pair of floating seal rings and a pair of rubber rings. Its working principle is: dynamic sealing is achieved through the end face friction rotation of the floating seal ring, and the rubber ring provides axial pressure and compensates for the end face wear of the floating seal ring.

[0004] Although the floating oil seal structure has a good sealing effect, its reliability is poor. There are problems such as the sealing ability decreasing severely after the rubber ring ages due to temperature influence, and the relative rotation between the floating seal ring and the rubber ring easily causing seal failure. Summary of the Invention

[0005] In view of this, the utility model provides a carrier roller with a combined sealing structure, which has good reliability and is not easy to fail in sealing.

[0006] To achieve the above object, the utility model provides the following technical solutions:

[0007] A carrier roller with a combined sealing structure includes: a wheel body, a wheel shaft, a shaft seat and a shaft sleeve.

[0008] The wheel body is sleeved on the wheel shaft. A shaft sleeve is arranged between the wheel body and the wheel shaft. Shaft seats are arranged at both ends of the wheel body. Both shaft seats are sleeved on the wheel shaft and fixedly connected to the wheel shaft; annular stepped structures are arranged on both end faces of the wheel body. The annular stepped structure has a first step surface. A non-compensating ring is arranged on the first step surface. The non-compensating ring is in interference fit with the first kick surface in the circumferential direction of the first step surface; a first annular sealing groove is arranged on the end face of the shaft seat facing the wheel body. The first annular sealing groove is opposite to the first step surface. A compensating ring is arranged in the first annular sealing groove. The sealing end face of the compensating ring abuts against the sealing end face of the non-compensating ring. A spring is arranged between the compensating ring and the bottom of the first annular sealing groove. The spring is used to provide axial pressure to compensate for the wear of the sealing end face of the compensating ring.

[0009] Preferably, first counterbores evenly distributed along the circumferential direction are arranged at the bottom of the first annular sealing groove, and the spring is installed in the first counterbores.

[0010] Preferably, a second annular sealing groove is provided on the end face of the non-compensating ring facing the wheel body, and a first sealing ring is arranged in the second annular sealing groove for sealing the gap between the end face of the non-compensating ring and the end face of the wheel body.

[0011] Preferably, a third annular sealing groove is provided on the circumference of the compensating ring, and a second sealing ring is arranged in the third annular sealing groove for sealing the gap between the outer peripheral surface of the compensating ring and the side wall of the first annular sealing groove.

[0012] Preferably, evenly distributed second counterbores are further provided at the bottom of the first annular sealing groove along the circumferential direction. Third counterbores are provided on the end face of the compensating ring opposite to the second counterbores, and the third counterbores correspond to the second counterbores one by one. Anti-rotation pins are arranged in the second counterbores, and the anti-rotation pins extend out of the second counterbores and extend into the third counterbores to prevent the compensating ring from rotating with the wheel.

[0013] Preferably, the annular stepped structure further has a second stepped surface located outside the first stepped surface. The end face of the axle seat part facing the wheel body is in clearance fit with the second stepped surface. A dust-proof ring is arranged on the second stepped surface, and the inner side and the outer side of the dust-proof ring are respectively abutted and cooperated with the outer peripheral surface of the axle seat and the second kicking surface on the circumference of the second stepped surface.

[0014] Compared with the prior art, a center idler with a combined sealing structure disclosed in the present application compensates for the wear of the sealing end face of the compensating ring by setting a spring. Compared with the floating sealing structure, it will not age like the floating sealing rubber ring after working at high temperature for a long time. Therefore, the spring can provide sufficient axial pressure for a long time to ensure the effectiveness of the seal, thereby effectively improving the reliability of the center idler and reducing the occurrence of oil leakage.

[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a sectional view of a center idler with a combined sealing structure disclosed in an embodiment of the present application.

[0017] Reference numerals:

[0018] 1, wheel body; 2, wheel shaft;

[0019] 3, axle seat; 31, first annular sealing groove;

[0020] 4. Bush; 5. Non-compensating ring; 6. Compensating ring; 7. Spring; 8. First sealing ring; 9. Second sealing ring; 10. Anti-rotation pin; 20. Dust ring. Detailed implementation mode

[0021] The utility model discloses a carrier roller with a combined sealing structure, which has good reliability and the seal is not easy to fail.

[0022] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation to the present utility model.

[0023] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0024] Reference will be made below to Figure 1 Describe the carrier roller with a combined sealing structure in the embodiments of the present utility model.

[0025] The embodiments of the present application disclose a carrier roller with a combined sealing structure, including: a wheel body 1, a wheel shaft 2, a shaft seat 3 and a bush 4.

[0026] Wherein, the wheel body 1 is sleeved on the wheel shaft 2, a bush 4 is arranged between the wheel body 1 and the wheel shaft 2, shaft seats 3 are arranged at both ends of the wheel body 1, both shaft seats 3 are sleeved on the wheel shaft 2 and are fixedly connected to the wheel shaft 2.

[0027] Both end faces of the wheel body 1 are provided with an annular stepped structure, the annular stepped structure has a first step surface, a non-compensating ring 5 is arranged on the first step surface, and the non-compensating ring 5 is in interference fit with a first kick surface on the first step surface in the circumferential direction; a first annular sealing groove 31 is arranged on the end face of the shaft seat 3 facing the wheel body 1, the first annular sealing groove 31 is opposite to the first step surface, a compensating ring 6 is arranged in the first annular sealing groove 31, the sealing end face of the compensating ring 6 abuts against the sealing end face of the non-compensating ring 5, and a spring 7 is arranged between the compensating ring 6 and the bottom of the first annular sealing groove 31, and the spring 7 is used to provide axial pressure to compensate for the wear of the sealing end face of the compensating ring 6.

[0028] For example Figure 1As shown, the non-compensating ring 5 on the first step surface of the wheel body 1 is axially opposite to the compensating ring 6 in the first annular sealing groove 31 of the shaft seat 3, and their respective sealing end faces are in contact with each other to form an effective seal; a spring 7 is also arranged in the first annular sealing groove 31, and the spring 7 is used to provide sufficient axial pressure for the abutting fit between the compensating ring 6 and the non-compensating ring 5 to ensure the effective fit of the sealing end faces. At the same time, when the sealing end face of the compensating ring 6 is worn, the axial pressure provided by the spring 7 can also make the sealing end face of the worn compensating ring 6 always keep in abutting fit with the sealing end face of the non-compensating ring 5, so as to compensate for the wear of the sealing end face of the compensating ring 6.

[0029] By setting the spring 7 to compensate for the wear of the sealing end face of the compensating ring 6, compared with the floating seal structure, it will not age like the floating seal ring after working at high temperature for a long time. Therefore, the spring 7 can provide sufficient axial pressure for a long time to ensure the effectiveness of the seal, thus effectively improving the reliability of the idler and reducing the occurrence of oil leakage.

[0030] In some embodiments, the bottom of the first annular sealing groove 31 is provided with first counterbores evenly distributed along the circumferential direction, and the spring 7 is installed in the first counterbores.

[0031] For example Figure 1 As shown, the setting of the first counterbores can facilitate the installation of the spring 7 and can effectively limit the spring 7 to prevent the spring 7 from deforming and misaligning.

[0032] In some embodiments, a second annular sealing groove is provided on the end face of the non-compensating ring 5 facing the wheel body 1, and a first sealing ring 8 is arranged in the second annular sealing groove for sealing the gap between the end face of the non-compensating ring 5 and the end face of the wheel body 1.

[0033] For example Figure 1 As shown, the first sealing ring 8 can effectively seal the gap between the non-compensating ring 5 and the end face of the wheel body 1, prevent the oil from leaking from the gap, further improve the overall sealing performance of the sealing structure, and enhance the reliability of the idler.

[0034] In some embodiments, a third annular sealing groove is provided on the circumference of the compensating ring 6, and a second sealing ring 9 is arranged in the third annular sealing groove for sealing the gap between the outer peripheral surface of the compensating ring 6 and the side wall of the first annular sealing groove 31.

[0035] For example Figure 1 As shown, the second sealing ring 9 can effectively seal the gap between the compensating ring 6 and the side wall of the first annular sealing groove 31 of the shaft seat 3, prevent the oil from leaking from the gap, further improve the overall sealing performance of the sealing structure, and enhance the reliability of the idler.

[0036] In some embodiments, second counterbores evenly distributed in the circumferential direction are further provided at the bottom of the first annular sealing groove 31. Third counterbores are provided on the end face of the compensation ring 6 opposite to the second counterbores. The third counterbores correspond to the second counterbores one by one. Anti-rotation pins 10 are provided in the second counterbores. The anti-rotation pins 10 extend out of the second counterbores and extend into the third counterbores to prevent the compensation ring 6 from rotating with the rotation.

[0037] For example Figure 1 As shown, multiple second counterbores and multiple first counterbores are staggeredly arranged at the bottom of the first annular sealing groove 31. The anti-rotation pins 10 provided in the second counterbores can effectively prevent the compensation ring 6 from rotating, avoiding the situation of seal failure caused by the rotation of the compensation ring 6.

[0038] In some embodiments, the annular stepped structure further has a second stepped surface located outside the first stepped surface. The end face of the axle seat 3 facing the wheel body 1 is in clearance fit with the second stepped surface. A dust-proof ring 20 is provided on the second stepped surface. The inner side and the outer side of the dust-proof ring 20 are respectively in abutting fit with the outer peripheral surface of the axle seat 3 and the second kicking surface in the circumferential direction of the second stepped surface.

[0039] For example Figure 1 As shown, the dust-proof ring 20 can effectively seal the gap between the end face of the axle seat 3 and the second stepped surface, preventing dust from entering the inside of the wheel body 1 from the gap, and further enhancing the overall reliability of the idler.

[0040] Other components and operations of the idler with a combined sealing structure according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0041] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0042] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A track roller with a combined sealing structure, characterized in that, Comprising: A wheel body, a wheel shaft, a shaft seat and a shaft sleeve; The wheel body is sleeved on the wheel shaft, a shaft sleeve is arranged between the wheel body and the wheel shaft, shaft seats are arranged at both ends of the wheel body, both of the two shaft seats are sleeved on the wheel shaft and fixedly connected with the wheel shaft; Circular stepped structures are arranged on both end faces of the wheel body, the circular stepped structure has a first step surface, a non-compensating ring is arranged on the first step surface, and the non-compensating ring is in interference fit with a first kicking surface in the circumferential direction of the first step surface; a first annular sealing groove is arranged on the end face of the shaft seat facing the wheel body, the first annular sealing groove is opposite to the first step surface, a compensating ring is arranged in the first annular sealing groove, a sealing end face of the compensating ring abuts against a sealing end face of the non-compensating ring, and a spring is arranged between the compensating ring and the bottom of the first annular sealing groove, and the spring is used to provide an axial pressure to compensate for wear of the sealing end face of the compensating ring.

2. The idler wheel with a combined sealing structure according to claim 1, characterized in that, A first counterbore uniformly distributed in the circumferential direction is arranged at the bottom of the first annular sealing groove, and the spring is installed in the first counterbore.

3. The carrier roller with a combined sealing structure according to claim 1, characterized in that, A second annular sealing groove is arranged on the end face of the non-compensating ring facing the wheel body side, and a first sealing ring is arranged in the second annular sealing groove for sealing a gap between the end face of the non-compensating ring and the end face of the wheel body.

4. The carrier roller with a combined sealing structure according to claim 1, characterized in that, A third annular sealing groove is arranged in the circumferential direction of the compensating ring, and a second sealing ring is arranged in the third annular sealing groove for sealing a gap between the outer peripheral surface of the compensating ring and the side wall of the first annular sealing groove.

5. The track roller with a combined sealing structure according to claim 1, characterized in that, A second counterbore uniformly distributed in the circumferential direction is further arranged at the bottom of the first annular sealing groove, a third counterbore is arranged on the end face of the compensating ring opposite to the second counterbore, the third counterbore corresponds to the second counterbore one by one, an anti-rotation pin is arranged in the second counterbore, and the anti-rotation pin extends out of the second counterbore and extends into the third counterbore to prevent the compensating ring from rotating.

6. The carrier roller with a combined sealing structure according to claim 1, characterized in that, The circular stepped structure further has a second step surface, the second step surface is located outside the first step surface, a part of the shaft seat facing the wheel body is in clearance fit with the second step surface, a dust-proof ring is arranged on the second step surface, and the inner side and the outer side of the dust-proof ring are respectively in abutting fit with the outer peripheral surface of the shaft seat and a second kicking surface in the circumferential direction of the second step surface.

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