Sealing structure for transmission shaft and transmission shaft assembly with sealing structure

Abstract

The utility model relates to the field of sealing structures, in particular to a sealing structure for a transmission shaft and a transmission shaft assembly with the sealing structure. The sealing ring comprises a ring body, sealing rib structures are arranged on the ring body, and each sealing rib structure comprises two single sealing ribs distributed on the ring body at intervals. According to the sealing structure disclosed by the utility model, the two single sealing ribs are arranged at intervals, so that a closed space is formed between the two single sealing ribs, the transmission shaft rod can be effectively prevented from being rusted, and grease in the universal joint can be effectively prevented from overflowing; therefore, the problem of grease leakage in the use process of the transmission shaft is solved.

Description

Technical Field

[0001] The utility model relates to the field of sealing structures, and more specifically to a sealing structure for a transmission shaft and a transmission shaft assembly having the same. Background Art

[0002] With the continuous development and progress of the automotive industry, people's demand for automotive performance is also increasing day by day; the four-wheel drive system is widely used in mid- to high-end vehicle configurations. In the four-wheel drive system, generally, bolts are used to fasten the transmission shaft to the transfer case flange; while for some vehicle models with limited layout space, the universal joint of the transmission shaft needs to be integrated with the transfer case, thus increasing the movement envelope clearance of the transmission shaft. At this time, the installation method of the transmission shaft becomes that the external spline of the transmission shaft head is inserted into the internal spline of the internal star wheel of the universal joint on the transfer case, and a circlip is used for connection.

[0003] The design difficulty of this connection method lies in the design of the sealing structure of the universal joint. Currently, the mainstream sealing structure is O-ring sealing, such as the sealing ring disclosed in Patent 200920126818.2 - O-ring with polytetrafluoroethylene coating film.

[0004] However, although the traditional O-ring sealing ring can achieve a certain sealing effect, in actual use, it is prone to the problem of grease leakage of the universal joint, resulting in abnormal noise of the universal joint and causing customer complaints.

[0005] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the design of the existing universal joint sealing ring structure. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a new sealing ring structure for a transmission shaft with good barrier performance and sealing effect.

[0007] To achieve the above purpose, the technical solution adopted by the utility model is as follows:[[]]END]]

[0008] A sealing structure for a transmission shaft, comprising a sealing ring; the sealing ring includes a ring body, and a sealing rib structure is provided on the ring body. Each sealing rib structure includes two monomer sealing ribs spaced apart on the ring body.

[0009] The outer side surface of the monomer sealing rib is an arc surface.

[0010] At least one set of sealing rib structures is provided on both the inner side and the outer side of the ring body.

[0011] A transmission shaft assembly, comprising a transmission shaft rod and a universal joint; the universal joint is sleeved on the transmission shaft rod; the universal joint includes a universal joint inner star wheel, and the transmission shaft sealing structure is provided in the region between the universal joint inner star wheel and the transmission shaft rod.

[0012] An installation ring groove is provided on the drive shaft rod.

[0013] A clamping mechanism is further provided between the drive shaft rod and the inner star wheel of the universal joint. The clamping mechanism includes a snap ring provided on the drive shaft rod, and an inner ring clamping groove is provided on the inner wall of the inner star wheel of the universal joint; an outer ring clamping groove is provided on the drive shaft rod, and the outer ring clamping groove is arranged opposite to the inner ring clamping groove.

[0014] The advantages of the present utility model are as follows:

[0015] The present utility model discloses a sealing structure for a drive shaft and a drive shaft assembly having the sealing structure.

[0016] In the sealing structure disclosed by the present utility model, through the spaced arrangement of two single sealing ribs, a sealed space is formed between the two single sealing ribs, which can not only effectively prevent the drive shaft rod from rusting, but also effectively prevent the grease in the universal joint from overflowing; thereby solving the problem of grease leakage during the use of the drive shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following briefly describes the content expressed in each drawing of the specification of the present utility model and the marks in the drawings:

[0018] Figure 1 is a schematic structural diagram of the present utility model.

[0019] Figure 2 is a schematic structural diagram of the drive shaft rod in the present utility model.

[0020] Figure 3 is a schematic structural diagram of the drive shaft assembly in the present utility model.

[0021] Figure 4 is a partial structural schematic diagram when the universal joint is connected to the drive shaft rod in the present utility model.

[0022] The marks in the above drawings are all:

[0023] 1, sealing ring; 2, drive shaft rod; 3, universal joint; 4, snap ring. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] The following further describes in detail the specific embodiments of the present utility model by describing the optimal embodiments with reference to the drawings.

[0025] A sealing structure for a drive shaft, comprising a sealing ring 1; the sealing ring 1 includes a ring body 11, and a sealing rib structure 12 is provided on the ring body 11. Each sealing rib structure 12 includes two monomeric sealing ribs 121 spaced apart on the ring body 11. In the sealing structure disclosed by the utility model, through the spaced arrangement of the two monomeric sealing ribs 121, a sealed space is formed between the two monomeric sealing ribs 121, playing a good role in isolation and protection.

[0026] When applied to the drive shaft subsequently, the first sealing rib prevents external environmental pollutants such as muddy water and dust from entering the universal joint 3, and the second sealing rib prevents the grease in the universal joint 3 from entering between the two sealing rings 1; based on the above design, the sealing structure disclosed by the utility model can not only effectively prevent the drive shaft rod 2 from rusting, but also effectively prevent the grease in the universal joint 3 from overflowing; thereby solving the problem of grease leakage during the use of the drive shaft.

[0027] Specifically, the sealing structure disclosed by the utility model mainly includes a sealing ring 1; the sealing ring 1 is arranged on the drive shaft, mainly playing a role of partition and sealing. In the utility model, the sealing ring 1 includes a ring body 11, and the ring body 11 is an annular structure, mainly being the main structure of the sealing ring 1. In the utility model, a sealing rib structure 12 is provided on the ring body 11, and the sealing rib structure 12 plays a good role of partition and block, facilitating better cooperation with the ring body 11 to achieve a better sealing effect.

[0028] At the same time, in the utility model, each sealing rib structure 12 includes two monomeric sealing ribs 121 spaced apart on the ring body 11; the two spaced-apart monomeric sealing ribs 121 form a sealed space between them. This sealed space can not only effectively prevent the drive shaft rod from rusting, but also effectively prevent the grease in the universal joint 3 from overflowing; thereby solving the problem of grease leakage during the use of the drive shaft.

[0029] Furthermore, in the utility model, the outer side surface of the monomeric sealing rib 121 is an arc surface; the setting of the arc surface can reduce the initial contact area between the monomeric sealing rib 121 and the mating component during subsequent assembly, reducing the assembly resistance. At the same time, such a setting can reduce the contact area between the monomeric sealing rib 121 and the adjacent component, increasing the unit extrusion pressure at the contact position between the monomeric sealing rib 121 and the adjacent component.

[0030] Furthermore, in the utility model, at least one set of sealing rib structures 12 is provided on both the inner side and the outer side of the ring body 11; by providing sealing rib structures 12 on both the inner and outer sides of the ring body 11 in the utility model, the tightness at the contact between the sealing ring 1 and the inner star wheel 31 of the universal joint as well as the drive shaft can be ensured; optimizing the use effect of the sealing ring 1.

[0031] A drive shaft assembly includes a drive shaft rod 2 and a universal joint 3; the universal joint 3 is sleeved on the drive shaft rod 2; the universal joint 3 includes a universal joint inner star wheel 31, and a sealing structure for the drive shaft is provided in the area between the universal joint inner star wheel 31 and the drive shaft rod 2; in the sealing structure disclosed by the present utility model, by the spaced arrangement of two single sealing ribs 121, a sealed space is formed between the two single sealing ribs 121, which can not only effectively prevent the drive shaft rod 2 from rusting, but also effectively prevent the grease inside the universal joint 3 from overflowing; thereby solving the problem of grease leakage during the use of the drive shaft.

[0032] Further, in the present utility model, an installation ring groove 21 is provided on the drive shaft rod 2; in the present utility model, the installation ring groove 21 facilitates the installation of the sealing ring 1 on the drive shaft rod 2, playing a positioning role and preventing the sealing ring 1 from moving on the drive shaft rod 2.

[0033] Further, in the present utility model, a clamping mechanism is further provided between the drive shaft rod 2 and the universal joint inner star wheel 31. The setting of the clamping mechanism in the present utility model realizes the connection between the drive shaft rod 2 and the universal joint inner star wheel 31, avoiding the relative axial movement of the two. At the same time, in the present utility model, the clamping mechanism includes a snap ring 4 provided on the drive shaft rod 2, and an inner ring clamping groove 32 is provided on the inner wall of the universal joint inner star wheel 31; an outer ring clamping groove 22 is provided on the drive shaft rod 2, and the outer ring clamping groove 22 and the inner ring clamping groove 32 are arranged oppositely; the combined use of the outer ring clamping groove 22 and the inner ring clamping groove 32 in the present utility model facilitates the installation and placement of the snap ring 4, and at the same time realizes the clamping and fixing of the snap ring 4 between the drive shaft rod 2 and the universal joint inner star wheel 31.

[0034] Specifically:

[0035] The present utility model discloses a sealing structure for a drive shaft and a drive shaft assembly having the sealing structure.

[0036] The sealing structure disclosed by the present utility model is mainly used for sealing the connection between the drive shaft and the universal joint 3; the purpose is to solve the problem of grease leakage of the universal joint 3 during the use of the drive shaft.

[0037] In the present utility model, the sealing structure mainly includes a sealing ring 1. The sealing ring 1 includes a ring body 11, and a sealing rib structure 12 is provided on the ring body 11. Each sealing rib structure 12 includes two monomeric sealing ribs 121 spaced apart on the ring body 11. Two monomeric sealing ribs 121 are designed on the sealing ring 1, and a certain distance is provided between the two monomeric sealing ribs 121 to achieve a double-layer sealing protection function. The first sealing rib prevents external environmental pollutants such as muddy water and dust from entering the universal joint 3, and the second sealing rib prevents the grease in the universal joint 3 from entering between the two sealing rings 1. At this time, a sealed space is formed between the two sealing ribs, which can not only effectively prevent the transmission shaft rod from rusting, but also effectively prevent the grease in the universal joint 3 from overflowing, thereby solving the problem of grease leakage during the use of the transmission shaft. The first sealing rib is arranged close to the outer side of the universal joint 3, and the second sealing rib is arranged close to the inner side of the universal joint 3.

[0038] The transmission shaft assembly disclosed in the present utility model mainly includes a universal joint 3, an inner star wheel 31 of the universal joint, a snap ring 4, a transmission shaft rod 2, and a sealing ring 1.

[0039] In the present utility model, two monomeric sealing ribs 121 are provided on the sealing ring 1 to increase the sealing surface and improve the sealing performance, preventing the transmission shaft rod 2 from being corroded by external pollutants and then damaging the sealing performance of the sealing ring 1.

[0040] During actual use, the snap ring 4 and the sealing ring 1 are respectively assembled into the corresponding grooves of the transmission shaft rod 2 through an assembly technique. When loading the vehicle, the transmission shaft rod 2 of the transmission shaft assembly is inserted into the inner star wheel 31 of the transfer case universal joint. After reaching the position, the snap ring 4 springs open, and the loading of the transmission shaft assembly is completed.

[0041] In the present utility model, two monomeric sealing ribs 121 are designed on the sealing ring 1, and are interference-fitted with the inner star wheel to form two sealing protections. The first sealing rib can prevent external pollutants from entering the universal joint 3. The second sealing rib prevents the grease in the universal joint 3 from entering between the two sealing ribs. At this time, a sealed space is formed between the two sealing ribs, which can not only effectively prevent the problem of sealing surface failure caused by the rust of the transmission shaft rod, but also effectively prevent the grease in the universal joint 3 from overflowing, thereby solving the problem of grease leakage during the use of the transmission shaft.

[0042] Obviously, the specific implementation of the present utility model is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present utility model, they are all within the protection scope of the present utility model.

Claims

1. A sealing structure for a transmission shaft, characterized in that: It comprises a sealing ring; the sealing ring comprises a ring body, the ring body is provided with a sealing rib structure, and each of the sealing rib structures comprises two monomer sealing ribs spaced apart and distributed on the ring body.

2. A sealing structure for a transmission shaft according to claim 1, characterized in that: The outer side surface of the single sealing rib is an arc-shaped surface.

3. A sealing structure for a transmission shaft according to claim 1, characterized in that: At least one set of sealing rib structures is disposed inside and outside the ring body.

4. A transmission shaft assembly, characterized in that: It comprises a transmission shaft and a universal joint; the universal joint is sleeved on the transmission shaft; the universal joint comprises an inner star wheel of the universal joint, and the area between the inner star wheel of the universal joint and the transmission shaft is provided with a sealing structure for the transmission shaft as claimed in any one of claims 1-3.

5. A transmission shaft assembly according to claim 4, characterized in that: The transmission shaft is provided with a placement ring groove.

6. A transmission shaft assembly according to claim 4, characterized in that: A clamping mechanism is also provided between the transmission shaft and the inner star wheel of the universal joint, and the clamping mechanism includes a clamping spring arranged on the transmission shaft, and an inner ring clamping groove is provided on the inner wall of the inner star wheel of the universal joint; an outer ring clamping groove is provided on the transmission shaft, and the outer ring clamping groove is arranged opposite to the inner ring clamping groove.

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