Intermediate shaft and cross shaft double-sealing structure

Abstract

The utility model belongs to the technical field of automobile parts, and particularly relates to a double-sealing structure for an intermediate shaft and a cross shaft. The double-sealing structure of the intermediate shaft and the cross shaft is high in sealing reliability and capable of prolonging the service life. The universal joint comprises a cross shaft, the shaft end of the cross shaft is connected with a bearing assembly, the bearing assembly comprises a shell, a bearing core matched with the shaft end of the cross shaft is arranged in the shell, an assembly opening corresponding to the cross shaft is formed in one end of the shell, and an inward turned edge is arranged at the position, located at the assembly opening, of the shell. A star-shaped rubber oil seal is arranged in an area defined by the bearing core, the turned edge and the shaft end of the cross shaft; an X-shaped rubber oil seal is arranged outside the shell and located in an area defined by the curled edge, the root of the shaft end of the cross shaft and the shaft shoulder.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile parts, and particularly relates to a double-sealing structure of a cross axle of an intermediate shaft. BACKGROUND

[0002] Cross axle universal joints are widely used in transmission systems of automobiles, engineering machinery and ships due to their characteristic of allowing axial angle change. The sealing performance of the cross axle as a core component directly determines the service life and reliability of the universal joint.

[0003] The cross axle needs good lubrication to reduce friction and wear during work, and lubricating grease is a commonly used lubricant. If the sealing is not good, the lubricating grease will leak out under the action of centrifugal force, pressure and the like, leading to insufficient lubrication, accelerating the wear of the cross axle and related components, and reducing the performance and service life of the transmission shaft. The environment of automobile driving is complex and changeable, and impurities such as dust, mud and sand on the road surface are easy to enter the inside of the transmission shaft assembly. Once these impurities enter the working area of the cross axle, they will aggravate the wear, damage the lubricating film, and even possibly cause the components to be stuck, affecting the normal operation of the automobile. SUMMARY

[0004] The utility model is just in view of the above problem, provide a kind of double-sealing structure of cross axle of intermediate shaft, sealing reliability is strong, can prolong service life.

[0005] In order to realize the above-mentioned purpose of the utility model, the utility model adopts the following technical scheme, the utility model discloses a cross axle, the shaft end of cross axle is connected with bearing assembly, the bearing assembly includes shell, the bearing core that is matched with the shaft end of cross axle is provided in shell, the assembly opening corresponding with cross axle is provided in one end of shell, the inward curling edge is provided in shell at assembly opening, and its characterized in that: the region surrounded by bearing core, curling edge and the shaft end of cross axle is provided with star-shaped rubber oil seal in shell;X-shaped rubber oil seal is provided in the region surrounded by curling edge, the shaft end root of cross axle and the shaft shoulder outside shell.

[0006] As a preferred scheme of the utility model, the star-shaped rubber oil seal is provided with four sealing lips in X shape, and the two sealing lips on the outside of the star-shaped rubber oil seal are in interference contact with the inner surface of the shell;The two sealing lips on the inside of the star-shaped rubber oil seal are in interference contact with the shaft diameter of the shaft end of the cross axle.

[0007] Further, arc-shaped grooves are provided between the two adjacent sealing lips.

[0008] Further, a gap is provided between the curling edge of the shell and the star-shaped rubber oil seal.

[0009] As another preferred scheme of the utility model, the X-shaped rubber oil seal is provided with four sealing lips, one sealing lip on the outer side of the X-shaped rubber oil seal is in interference contact with the outer side of the shell; another sealing lip on the outer side of the X-shaped rubber oil seal is in interference contact with the shaft shoulder of the cross shaft; one sealing lip on the inner side of the X-shaped rubber oil seal is in contact with the part of the shaft diameter and the shaft shoulder of the cross shaft; another sealing lip on the inner side of the X-shaped rubber oil seal is matched with the gap between the shell curling edge and the shaft diameter of the cross shaft end.

[0010] Further, the length of the two sealing lips on the outer side of the X-shaped rubber oil seal is greater than that of the two sealing lips on the inner side of the X-shaped rubber oil seal.

[0011] The utility model discloses the beneficial effects that 1, the utility model discloses the double sealing structure of the combination of the external X-shaped rubber oil seal and the embedded star-shaped rubber oil seal, realizes multiple sealing to the cross shaft through the sealing point formed by eight sealing lips, and the sealing effect is improved obviously, prevents the leakage of lubricating grease and the invasion of impurities.

[0012] 2, the utility model discloses the sealing effect is improved, and lubricating grease is not easy to lose, and impurities are difficult to enter, thereby ensuring the good lubrication state of the cross shaft, thereby effectively reducing the wear and tear, and prolonging the service life of the cross shaft and related components.

[0013] 3, the sealing structure of the utility model is strengthened and can improve the operation stability and reliability of the transmission system under complex road conditions, and reduce the fault risk caused by sealing failure.

[0014] 4, the interference fit of X-shaped rubber oil seal and star-shaped rubber oil seal is formed in multiple contact surfaces through the compression force of cross shaft and bearing, and the sealing effect is further improved, and the probability of poor sealing caused by improper assembly is reduced.

[0015] 5, the structure that the star-shaped rubber oil seal is embedded in the bearing interior can avoid being directly exposed to the external harsh environment, improves the service life of the oil seal and the stability of the overall sealing system. ACCURATE DRAWINGS

[0016] Figure 1 It is the structure schematic diagram of the utility model.

[0017] Figure 2 It is Figure 1 the local enlarged view.

[0018] Figure 3 It is the structure schematic diagram of the X-shaped rubber oil seal.

[0019] Figure 4 It is the structure schematic diagram of the star-shaped rubber oil seal.

[0020] 1 is a bearing assembly, 2 is a housing, 3 is a bearing core, 4 is a star-shaped rubber oil seal, 5 is an X-shaped rubber oil seal, 6 is an axle end, 7 is a cross axle, 8 is a curled edge, 9 is an arc-shaped groove, 10 is a sealing lip, 11 is an axle shoulder. DETAILED DESCRIPTION

[0021] The utility model discloses a cross axle 7, the axle end 6 of cross axle 7 is connected with bearing assembly 1, bearing assembly 1 includes the housing 2, is provided with the bearing core 3 with the axle end 6 cooperation of cross axle 7 in the housing 2, one end of housing 2 is provided with the assembly opening corresponding with cross axle 7, the curled edge 8 of housing 2 is located at the assembly opening and is provided with the inward, in the housing 2, be provided with star-shaped rubber oil seal 4 in the area that the axle end 6 of cross axle 7, curled edge 8 and bearing core 3 enclose, the X-shaped rubber oil seal 5 of being provided with in the area that the axle end 6 root of cross axle 7 and curled edge 8 and axle shoulder 11 enclose outside the housing 2, by setting up star-shaped rubber oil seal 4 and X-shaped rubber oil seal 5 respectively in the housing 2 inside and outside, form double -layer sealing structure, effectively prevent the grease leakage and the intrusion of the impurity such as mud, moisture of outside, thereby promote the sealing performance and the service life of bearing. In addition, double -layer sealing structure also enhanced the adaptability under the harsh working condition, ensure the stable operation of transmission system.

[0022] The star-shaped rubber oil seal 4 is provided with four sealing lips 10 in X shape, the outer two sealing lips 10 of the star-shaped rubber oil seal 4 are in interference contact with the inner surface of the housing 2, and the inner two sealing lips 10 of the star-shaped rubber oil seal 4 are in interference contact with the shaft diameter of the axle end 6 of the cross axle 7. The star-shaped rubber oil seal 4 adopts a four-lip structure, and the inner and outer lips are in interference fit with the housing 2 and the cross axle 7 respectively, so that the inside and outside can be sealed at the same time, and the sealing reliability is enhanced. At the same time, the X-shaped layout of the four lips effectively reduces the influence of eccentricity caused by the movement of the parts on the sealing performance, prolonging the service life of the oil seal.

[0023] Arc-shaped grooves 9 are arranged between the adjacent two sealing lips 10. The arc-shaped grooves 9 arranged between the sealing lips 10 help to disperse the assembly pressure, improve the fit and elastic response capability of the oil seal, thereby enhancing the dynamic sealing effect; at the same time, a certain amount of lubricating grease can be stored on one side of the bearing core 3, improving the lubricating performance; the arc-shaped grooves 9 on the outside of the bearing assembly 1 can store impurities entering from the outside, and after the impurities increase, the star-shaped rubber oil seal 4 is axially extruded, further improving the sealing effect.

[0024] A gap is arranged between the curled edge 8 of the housing 2 and the star-shaped rubber oil seal 4. The gap is reserved between the curled edge 8 and the oil seal to avoid damage or deformation of the oil seal caused by interference during the press-fitting process, which is conducive to the long-term stability of the installation precision control and the sealing performance.

[0025] The X-shaped rubber oil seal 5 is provided with four sealing lips 10, one of the sealing lips 10 on the outer side of the X-shaped rubber oil seal 5 is in interference contact with the outer side of the roll edge 8 of the housing 2, another sealing lip 10 on the outer side of the X-shaped rubber oil seal 5 is in interference contact with the shaft shoulder 11 of the cross shaft 7, one of the sealing lips 10 on the inner side of the X-shaped rubber oil seal 5 is in contact with the shaft diameter and the part of the shaft shoulder 11 of the cross shaft 7, and another sealing lip 10 on the inner side of the X-shaped rubber oil seal 5 is matched with the gap between the roll edge 8 of the housing 2 and the shaft diameter of the cross shaft 7. The X-shaped rubber oil seal 5 forms a composite seal through different lips and multiple contact surfaces such as the housing 2, the shaft shoulder 11 and the shaft diameter, effectively adapts to the matching form and dynamic operation condition of different parts, and improves the adaptability and durability of the sealing structure.

[0026] The lengths of the two sealing lips 10 on the outer side of the X-shaped rubber oil seal 5 are greater than the lengths of the two sealing lips 10 on the inner side of the X-shaped rubber oil seal 5. By adjusting the length difference of the sealing lips 10, the outer side lips provide a larger contact surface and elastic stroke to cope with the impact of the external environment and the erosion of pollutants.

[0027] Embodiment: as Figure 1 The utility model discloses a cross shaft 7, bearing assembly 1, X type rubber oil seal 5 and star type rubber oil seal 4, the oil seal adopts double oil seal sealing structure, the external X type rubber oil seal 5 + bearing embedded star type rubber oil seal 4 of bearing, the roll edge 8 of housing 2 and the X face pressure of external X type rubber oil seal 5 are tightly matched, and the inner diameter of housing 2 and the interference fit of two outer diameter lips of star type rubber oil seal 4, X type rubber oil seal 5 two inner diameter sealing lips and cross shaft 7 root interference fit, X type rubber oil seal 5 two outer diameter sealing lips and shaft shoulder 11 and roll edge 8 interference fit, star type rubber oil seal 4 two inner diameter lips and cross shaft 7 shaft diameter interference fit eight seals.

[0028] As Figure 2 The utility model discloses a cross shaft 7, bearing assembly 1, X type rubber oil seal 5 and star type rubber oil seal 4, the oil seal adopts double oil seal sealing structure, the external X type rubber oil seal 5 + bearing embedded star type rubber oil seal 4 of bearing, the roll edge 8 of housing 2 and the X face pressure of external X type rubber oil seal 5 are tightly matched, and the inner diameter of housing 2 and the interference fit of two outer diameter lips of star type rubber oil seal 4, X type rubber oil seal 5 two inner diameter sealing lips and cross shaft 7 root interference fit, X type rubber oil seal 5 two outer diameter sealing lips and shaft shoulder 11 and roll edge 8 interference fit, star type rubber oil seal 4 two inner diameter lips and cross shaft 7 shaft diameter interference fit eight seals.

[0029] The utility model discloses a cross shaft 7, bearing assembly 1, X type rubber oil seal 5 and star type rubber oil seal 4, the oil seal adopts double oil seal sealing structure, the external X type rubber oil seal 5 + bearing embedded star type rubber oil seal 4 of bearing, the roll edge 8 of housing 2 and the X face pressure of external X type rubber oil seal 5 are tightly matched, and the inner diameter of housing 2 and the interference fit of two outer diameter lips of star type rubber oil seal 4, X type rubber oil seal 5 two inner diameter sealing lips and cross shaft 7 root interference fit, X type rubber oil seal 5 two outer diameter sealing lips and shaft shoulder 11 and roll edge 8 interference fit, star type rubber oil seal 4 two inner diameter lips and cross shaft 7 shaft diameter interference fit eight seals.

[0030] The embedded star-shaped rubber oil seal 4 of the bearing assembly 1 is used from the design reason: the oil seal itself is greatly protected, the oil seal is avoided from being directly exposed in the harsh environment, and the molecular structure of the oil seal body is avoided from being affected by the external environment; from the size cooperation: the oil seal inner and outer four lip openings are pressed and cooperated after the cross shaft 7 shaft diameter is assembled with the bearing assembly 1 inner diameter, from the failure mode: if the sand enters the bearing opening part, the star-shaped rubber oil seal 4 is only axially compressed under the accumulation and compression of the sand, the radial sealing degree is greater, the sealing performance is better, the whole oil seal is not directly affected by the external environment in the bearing, and therefore better sealing performance is obtained.

[0031] The embedded star-shaped rubber oil seal 4 of the bearing assembly 1 is used as the sealing basis, the external X-shaped rubber oil seal 5 is added outside, the possibility that the sand enters the bearing under the harsh environment can be effectively reduced or lowered, and therefore the star-shaped rubber oil seal 4 sealing is more reliable.

[0032] It can be understood that the above specific description of the utility model is only used for illustrating the utility model and is not limited to the technical scheme described in the utility model embodiment, and the person skilled in the art should understand that the utility model can still be modified or replaced to achieve the same technical effect, as long as the use needs are met, and it is within the protection scope of the utility model.

Claims

1. A double-sealed intermediate shaft cross shaft structure, comprising a cross shaft (7), the shaft end (6) of the cross shaft (7) being connected to a bearing assembly (1), the bearing assembly (1) comprising a housing (2), a bearing core (3) being disposed inside the housing (2) and cooperating with the shaft end (6) of the cross shaft (7), one end of the housing (2) being provided with an assembly port corresponding to the cross shaft (7), and the housing (2) being provided with an inwardly rolled edge (8) at the assembly port, characterized in that: The star-shaped rubber oil seal (4) is provided in the area surrounded by the bearing core (3), the crimping edge (8) and the shaft end (6) of the cross shaft (7) in the shell (2); the X-shaped rubber oil seal (5) is provided in the area surrounded by the root of the crimping edge (8) and the shaft end (6) of the cross shaft (7) and the shaft shoulder (11) outside the shell (2).

2. The double seal construction for a pinion shaft of a countershaft transmission according to claim 1, characterized in that: The star-shaped rubber oil seal (4) is provided with four sealing lips (10) in X shape, the two sealing lips (10) outside the star-shaped rubber oil seal (4) are in interference contact with the inner surface of the shell (2); the two sealing lips (10) inside the star-shaped rubber oil seal (4) are in interference contact with the shaft diameter of the shaft end (6) of the cross shaft (7).

3. The double seal construction for a pinion shaft of a countershaft transmission as set forth in claim 2, wherein: Arc-shaped grooves (9) are provided between the two adjacent sealing lips (10).

4. The double seal construction for a pinion shaft of a countershaft transmission as set forth in claim 2, wherein: The gap is provided between the crimping edge (8) of the shell (2) and the star-shaped rubber oil seal (4).

5. The double seal construction for a propeller shaft universal joint of claim 1 wherein: The X-shaped rubber oil seal (5) is provided with four sealing lips (10) in X shape, the sealing lip (10) outside the X-shaped rubber oil seal (5) is in interference contact with the outside of the crimping edge (8) of the shell (2); the other sealing lip (10) outside the X-shaped rubber oil seal (5) is in interference contact with the shaft shoulder (11) of the cross shaft (7); the sealing lip (10) inside the X-shaped rubber oil seal (5) is in contact with the part where the shaft diameter of the cross shaft (7) and the shaft shoulder (11) are overlapped; the other sealing lip (10) inside the X-shaped rubber oil seal (5) is matched with the gap between the crimping edge (8) of the shell (2) and the shaft diameter of the shaft end (6) of the cross shaft (7).

6. A double seal construction for a propeller shaft cross, according to claim 5, wherein: The lengths of the two sealing lips (10) outside the X-shaped rubber oil seal (5) are greater than the lengths of the two sealing lips (10) inside the X-shaped rubber oil seal (5).

Images