CN219472603U

CN219472603U - Camshaft sealing device for axle

Info

Publication number: CN219472603U
Application number: CN202320139560.XU
Authority: CN
Inventors: 王波; 林玮静; 侯艳丽
Original assignee: China National Heavy Duty Truck Group Jinan Power Co Ltd
Current assignee: China National Heavy Duty Truck Group Jinan Power Co Ltd
Priority date: 2023-01-29
Filing date: 2023-01-29
Publication date: 2023-08-04
Anticipated expiration: 2033-01-29

Abstract

The camshaft sealing device for the axle comprises a supporting sleeve which can be sleeved with a camshaft in a sliding manner, wherein a first cavity, a second cavity and a third cavity which are coaxial are sequentially arranged in the supporting sleeve; the first cavity is in clearance fit with the cam shaft, the inner diameter of the second cavity is larger than that of the first mounting cavity, a step A is formed, the inner diameter of the third cavity is larger than that of the second cavity, and a step B is formed; the second cavity is internally provided with a composite bushing which can be sleeved with the camshaft in a sliding way, and the third cavity is internally provided with an oil seal mechanism which can seal the end part of the camshaft. The camshaft sealing device for the axle has the advantages of reasonable design, ingenious structure, convenient assembly and use, good sealing effect, capability of preventing foreign dust, dirt and other impurities from polluting lubricating oil, effective prolonging of the service life of the lubricating oil and guarantee of normal use of the camshaft.

Description

Camshaft sealing device for axle

Technical Field

The utility model relates to the technical field of vehicles, in particular to a camshaft sealing device for an axle.

Background

The cam shaft is an important part of a vehicle drum brake, and when in braking, the S-shaped cam at the end part of the cam shaft drives the cam shaft to rotate so as to push two brake shoes of the brake, the brake shoes are outwards opened, friction plates positioned at the outer sides of the brake shoes are abutted against the inner surface of the brake drum, and the friction force generated between the friction plates and the brake drum is utilized to form braking force of the vehicle.

At present, the camshaft is generally connected in a sleeve in a penetrating way, specifically, a sleeve is fixed on the brake bottom plate of the axle assembly, two ends of the camshaft are respectively in pivot fit with the brake bottom plate and the sleeve, and in order to ensure flexible rotation of the camshaft, lubricating oil is filled in the brake bottom plate and the sleeve, and meanwhile, the lining between the camshaft and the brake bottom plate and the sleeve is prevented from being worn.

Although the lubrication oil filled in the sleeve can prevent the abrasion of the lining between the camshaft and the brake bottom plate and between the sleeve, the following defects still exist in the actual use process: the sleeve is simply sleeved on the cam shaft, a gap for filling lubricating oil exists between the sleeve and the cam shaft, and because the mine car is often used for severe working conditions such as gravel dust worksite and the like, when the gap for filling lubricating oil is not sealed and protected, impurities such as external dust and dirt can easily enter the gap, grease is polluted, the function of the grease is invalid, the cam shaft is not rotated, the brake is not returned, the brake performance is affected, and the brake is locked and dragged or the brake effect is poor in severe cases.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide the camshaft sealing device for the axle, which has reasonable design, ingenious structure, convenient assembly and use and good sealing effect, can prevent foreign matters such as external dust, dirt and the like from polluting lubricating oil, can effectively prolong the service life of the lubricating oil and ensures the normal use of the camshaft.

The utility model is realized by the following technical scheme: the camshaft sealing device for the axle comprises a supporting sleeve which can be sleeved with a camshaft in a sliding manner, wherein a first cavity, a second cavity and a third cavity which are coaxial are sequentially arranged in the supporting sleeve; the first cavity is in clearance fit with the cam shaft, the inner diameter of the second cavity is larger than that of the first cavity, a step A is formed, the inner diameter of the third cavity is larger than that of the second cavity, and a step B is formed; the second cavity is internally provided with a composite bushing which can be sleeved with the camshaft in a sliding way, and the third cavity is internally provided with an oil seal mechanism which can seal the end part of the camshaft.

When the sealing device is specifically assembled, the middle section of the camshaft passes through the supporting sleeve and the composite bushing to be in oil seal mechanism, the composite bushing is in interference press fit in the first cavity of the supporting sleeve, the composite bushing is also in clearance fit with the camshaft, the clearance is a lubricating oil cavity, lubricating oil is injected into the oil cavity, and the oil seal mechanism is in interference press fit in the third cavity of the supporting sleeve. In the structure, the step A not only can fix the front end of the composite bushing, but also can seal the front end part of the lubricating oil cavity, and the step B can play a role in fixing the oil seal mechanism, so that the oil seal mechanism can fix the rear end of the bushing and the oil seal mechanism can seal the rear end part of the lubricating oil cavity. Therefore, the double-step structure of the step A and the step B not only can better fix the composite bushing, but also can well seal the lubricating oil cavity, and impurities such as external dust, dirt and the like are difficult to enter into the lubricating oil cavity, so that the service life of lubricating oil is greatly prolonged, the rotation flexibility of a cam shaft and the use effect of a brake are ensured, the assembly process of the sealing device is simple, the space installation and arrangement are convenient, and the assembly cost is saved.

According to the utility model, the support sleeve and the composite bushing are provided with oil filling holes which correspond to each other and are communicated with the lubricating oil cavity, and the sealing oil nozzle is arranged in the oil filling holes. Through the structure, the lubricating oil can be conveniently injected by workers, and the sealing oil nozzle can be taken down for oiling, so that the lubricating oil injection device is very convenient.

The utility model further improves the threaded connection between the sealing oil nozzle and the oil filling hole on the supporting sleeve. The threaded connection structure is convenient to install and good in sealing performance.

The utility model further improves, the oil seal mechanism comprises an oil seal and an oil seal seat which are sleeved on the cam shaft, the oil seal is arranged in the oil seal seat, and the oil seal seat is arranged in the third cavity. Through the structure, the oil seal seat not only can support and protect the oil seal, but also can enable the whole oil seal mechanism to better fix the composite bushing.

Further improvements of the utility model are that the lip of the oil seal faces the oil filler hole. By adopting the structure, when the lubricating oil is filled, whether the lubricating oil is filled or not can be judged through overflowing of the lip, and the lubricating oil filling device is very convenient.

The utility model further improves that the oil seal is pressed in the oil seal seat in an interference manner, and the end face matching gap is not more than 0.2mm. The structure is more reasonable, and can be suitable for actual working conditions.

From the technical scheme, the beneficial effects of the utility model are as follows:

when the sealing device is specifically assembled, the middle section of the camshaft passes through the supporting sleeve and the composite bushing to be in oil sealing device, the composite bushing is in interference press fit in the first cavity of the supporting sleeve, the composite bushing is also in clearance fit with the camshaft, the clearance is a lubricating oil cavity, lubricating oil is injected into the oil cavity, and the oil sealing mechanism is in interference press fit in the third cavity of the supporting sleeve. In the structure, the step A not only can fix the front end of the composite bushing, but also can seal the front end part of the lubricating oil cavity, and the step B can play a role in fixing the oil seal mechanism, so that the oil seal mechanism can fix the rear end of the bushing and the oil seal mechanism can seal the rear end part of the lubricating oil cavity. Therefore, the double-step structure of the step A and the step B not only can better fix the composite bushing, but also can well seal the lubricating oil cavity, and impurities such as external dust, dirt and the like are difficult to enter into the lubricating oil cavity, so that the service life of lubricating oil is greatly prolonged, the rotation flexibility of a cam shaft and the use effect of a brake are ensured, the assembly process of the sealing device is simple, the space installation and arrangement are convenient, and the assembly cost is saved.

Drawings

In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the description will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of an embodiment of the present utility model.

Fig. 2 is a schematic structural view of a support sleeve according to an embodiment of the present utility model.

Fig. 3 is a schematic structural view of an oil seal mechanism according to an embodiment of the present utility model.

1. A support sleeve; 101. a first cavity; 102. a second cavity; 103. a third cavity; 104. a step A; 105. a step B; 2. a composite bushing; 3. an oil seal mechanism; 301. an oil seal; 302. an oil seal seat; 4. sealing the oil nozzle; 5. and a cam shaft.

Detailed Description

In order to make the objects, features and advantages of the present utility model more obvious and understandable, the technical solutions of the present utility model will be clearly and completely described below with reference to the drawings in this specific embodiment, and it is apparent that the embodiments described below are only some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, based on the embodiments in this patent, which would be within the purview of one of ordinary skill in the art without the particular effort to make the utility model are intended to be within the scope of the patent protection.

Referring now to fig. 1-3, in connection with the specific embodiments, the following is described: the utility model relates to a camshaft sealing device for an axle, which comprises a supporting sleeve 1, wherein a first cavity 101, a second cavity 102 and a third cavity 103 which are coaxial are sequentially arranged in the supporting sleeve 1 from front to back; the inner diameter of the first cavity 101 corresponds to the camshaft 5, so that the supporting sleeve 1 can be sleeved on the camshaft 5; the inner diameter of the second cavity 102 is larger than that of the first cavity 101, so that the joint between the two cavities forms a structure of a step A104; the second cavity 102 is internally provided with a composite bushing 2, the composite bushing 2 is sleeved on the camshaft 5, and a lubricating oil cavity is formed between the composite bushing 2 and the camshaft 5; the inner diameter of the third cavity 103 is larger than that of the second cavity 102, so that the joint between the two cavities forms a step B105 structure, an oil seal mechanism 3 is arranged in the third cavity 103, and the oil seal mechanism 3 is sleeved on the cam shaft 5.

The application principle of the utility model is as follows: when the sealing device is specifically assembled, the middle section of the camshaft 5 passes through the supporting sleeve 1 and the composite bushing 2 to be in oil seal mechanism 3, the composite bushing 2 is in interference press fit in the first cavity 101 of the supporting sleeve 1, the composite bushing 2 is also in clearance fit with the camshaft 5, the clearance is a lubricating oil cavity, lubricating oil is injected into the oil cavity, and the oil seal mechanism 3 is in interference press fit in the third cavity 103 of the supporting sleeve 1. In the above-described structure, the step a104 can fix not only the front end of the composite bush 2 but also the front end portion of the oil chamber, and the step B105 can play a role of fixing the oil seal mechanism 3, thereby enabling the oil seal mechanism 3 to fix the rear end of the composite bush 2 and the oil seal mechanism 3 to seal the rear end portion of the oil chamber. Therefore, the double-step structure of the step A104 and the step B105 not only can better fix the composite bushing 2, but also can well seal the lubricating oil cavity, and impurities such as external dust, dirt and the like are difficult to enter the lubricating oil cavity, so that the service life of lubricating oil is greatly prolonged, the camshaft rotation flexibility and the use effect of a brake are ensured, and the assembly process of the sealing device is simple, the space installation and arrangement are convenient, and the assembly cost is saved.

In one embodiment, the support sleeve 1 and the composite bushing 2 are provided with oil filling holes which correspond to each other and are communicated with the lubricating oil cavity, and a sealing oil nozzle 4 is arranged in the oil filling holes. Through the structure, the lubricating oil can be conveniently injected by workers, and the sealing oil nozzle 4 can be taken down for oil injection, so that the device is very convenient.

In one embodiment, the sealing oil nozzle 4 is in threaded connection with the oil filling hole on the supporting sleeve 1. The threaded connection structure is convenient to install and good in sealing performance.

In one of the embodiments, the oil seal mechanism 3 includes an oil seal 301 and an oil seal seat 302 that are sleeved on the camshaft 5, and in particular, the structure of the oil seal 301 and the oil seal seat 302 can refer to the prior art. The oil seal 301 is installed in the oil seal seat 302, and the oil seal seat 302 is installed inside the third cavity 103. Through the above structure, the oil seal seat 302 can support not only the protection oil seal 301 but also the whole oil seal mechanism 3 can better fix the composite bush 2.

In one embodiment, the lip of the oil seal 301 faces the oil filler hole. By adopting the structure, when the lubricating oil is filled, whether the lubricating oil is filled or not can be judged through overflowing of the lip, and the lubricating oil filling device is very convenient.

In one embodiment, the oil seal 301 is press-fitted into the oil seal seat 302 with an end face matching gap of not more than 0.2mm. The structure is more reasonable, and can be suitable for actual working conditions.

In the present specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between the embodiments are only required to be referred to each other.

The terms "upper", "lower", "outside", "inside", and the like in the description and in the claims of the present utility model and in the above drawings, if any, are used for distinguishing between relative relationships in position and not necessarily for giving qualitative sense. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a camshaft sealing device for axle, includes support sleeve (1) that can slide set with camshaft (5), its characterized in that: the inside of the supporting sleeve (1) is sequentially provided with a first cavity (101), a second cavity (102) and a third cavity (103) which are coaxial; the first cavity (101) is in clearance fit with the camshaft (5), the inner diameter of the second cavity (102) is larger than that of the first cavity (101) and forms a step A (104), the inner diameter of the third cavity (103) is larger than that of the second cavity (102) and forms a step B (105); the second cavity (102) is internally provided with a composite bushing (2) which can be sleeved with the camshaft (5) in a sliding way, and the third cavity (103) is internally provided with an oil seal mechanism (3) which can seal the end part of the camshaft (5).

2. The camshaft sealing device for an axle according to claim 1, wherein: oil holes are respectively and correspondingly formed in the support sleeve (1) and the composite bushing (2), and a sealing oil nozzle (4) is arranged in the oil holes.

3. The camshaft sealing device for an axle according to claim 2, wherein: the sealing oil nozzle (4) is in threaded connection with the oil filling hole on the supporting sleeve (1).

4. A camshaft seal device for an axle according to claim 2 or 3, characterized in that: the oil seal mechanism (3) comprises an oil seal (301) and an oil seal seat (302) which are sleeved on the cam shaft (5), the oil seal (301) is installed in the oil seal seat (302), and the oil seal seat (302) is installed in the third cavity (103).

5. The camshaft sealing device for an axle according to claim 4, wherein: the lip of the oil seal (301) faces the oil filler hole.

6. The camshaft sealing device for an axle according to claim 5, wherein: the oil seal (301) is pressed in the oil seal seat (302) in an interference manner, and the end face matching gap is not more than 0.2mm.