Disconnection type driving front axle output end sealing structure

Abstract

The utility model relates to a disconnected type driving front axle output end sealing structure, and belongs to the technical field of automobiles. A bearing is arranged on the inner side of the mounting through hole, a half shaft extending outwards is connected in the bearing, the end of the inner side of the half shaft is connected with a half shaft gear, a sealing ring is arranged on the outer side of the mounting through hole, a main lip of the sealing ring is connected with an elastic seal at a shaft neck of the half shaft, and a dust cover is coaxially and fixedly connected to the shaft neck of the half shaft. The dustproof cover covers the exposed end face of the sealing ring and is in clearance fit with the surface of the main speed reducer shell. The outer end side of the sealing ring is provided with a spigot flange and an outwards-turned dustproof lip, and the dustproof cover is provided with a first peripheral side wall in clearance fit with the peripheral side face of the spigot flange and a second peripheral side wall in elastic sealing fit with the dustproof lip. The spigot flange of the sealing ring and the first peripheral side wall form a first dustproof sealing structure, and the dustproof lip and the second peripheral side wall form a second dustproof sealing structure, so that the sealing performance and the silt prevention effect of the device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to a disconnection-type driving front axle output end sealing structure. Background Art

[0002] To adapt to pickup trucks, a disconnect-drive front axle assembly was developed. This involves the assembly structure with the drive shaft. Pickup trucks are used in a variety of applications, often navigating harsh terrain like deserts and muddy terrain. Therefore, the output-side seal must exhibit excellent resistance to mud and sand.

[0003] In the prior art, for example, publication number CN217713580U describes a dustproof and sealing structure for the mating portion of a drive shaft and a transmission. The structure comprises a drive shaft movable joint housing and a transmission housing mating with one end of the housing. A transmission oil seal is provided at the mating portion of the drive shaft movable joint housing and the transmission housing. The oil seal lip of the transmission oil seal fits over an oil seal stop at one end of the drive shaft movable joint housing. A dust stop with a diameter greater than that of the oil seal stop is provided on a shaft journal adjacent to the oil seal stop. The oil seal side lip of the transmission oil seal has an interference fit with the oil seal dust stop. This structure utilizes the oil seal dust stop added to the drive shaft movable joint housing (equivalent to the axle) and the mating oil seal side lip of the transmission oil seal, with the oil seal side lip and the oil seal dust stop forming an interference fit, thereby improving the sealing effect. However, this structure is suitable for operating environments with good road conditions and no mud and sand. It is not suitable for pickup trucks used in complex driving scenarios. The mud and sand splashed from the outside will directly contact the oil seal side lip and may enter the oil seal side lip, causing excessive wear and affecting the sealing performance.

[0004] Secondly, for the existing disconnected drive front axle assembly, the axial movement and radial runout of the half-shaft are large, which will also affect the sealing performance of the sealing structure at the normal output end.

[0005] Therefore, the existing sealing structure cannot meet the requirements of the disconnected drive front axle assembly for complex usage scenarios. Utility Model Content

[0006] In order to improve the sealing performance and anti-mud and sand effect of a disconnecting drive front axle assembly, the utility model provides a disconnecting drive front axle output end sealing structure.

[0007] It adopts the following technical solutions:

[0008] A disconnecting drive front axle output end sealing structure includes a main reducer housing, a mounting through hole is provided on the main reducer housing, a bearing is provided on the inner side of the mounting through hole, an outwardly extending half-shaft is connected in the bearing, the inner end of the half-shaft is connected to the half-shaft gear, a sealing ring is provided on the outer side of the mounting through hole, the main lip of the sealing ring is elastically sealed with the half-shaft journal, a dust cover is coaxially fixedly connected to the half-shaft journal, the dust cover covers the exposed end face of the sealing ring and is gap-matched with the surface of the main reducer housing; the outer end side of the sealing ring is provided with a stop flange and an outward-turned dust lip, the dust cover has a first circumferential side wall gap-matched with the circumferential side of the stop flange and a second circumferential side wall elastically sealingly matched with the dust lip.

[0009] Furthermore, the dust cover has an annular groove and a coaxially arranged outer flange, the first peripheral side wall is the inner side wall of the outer flange, and the second peripheral side wall is the inner side wall of the annular groove away from the center of the circle.

[0010] Furthermore, the depth of the annular groove is greater than the size of the fitting area of ​​the dust lip.

[0011] Furthermore, the dust cover has a sleeve structure at the center, and the sleeve structure is coaxially fixedly connected to the half-shaft journal through interference fit.

[0012] Furthermore, an annular oil baffle is provided in the mounting through hole, the inner hole of the oil baffle is clearance-matched with the journal of the half-shaft, and the oil baffle is located between the bearing and the sealing ring.

[0013] Furthermore, the single-side fitting clearance between the inner hole of the oil baffle and the half-shaft journal does not exceed 2 mm.

[0014] Furthermore, the inner end of the half shaft has an external spline and a first retaining ring groove, the inner spline hole of the half shaft gear is provided with a second retaining ring groove, and the first and second retaining ring grooves are both clamped with a retaining ring.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The main lip of the sealing ring of this device and the half-shaft form an oil sealing structure. At the same time, the stop flange and the first peripheral side wall form a first dust-proof sealing structure, and the dust lip and the second peripheral side wall form a second dust-proof sealing structure. Through the interaction of the above structures, the sealing and anti-mud and sand effects of the disconnected drive front axle assembly are improved.

[0017] By setting up the oil baffle, the erosion of the internal oil on the main lip of the sealing ring is reduced, thus avoiding oil leakage of the sealing ring.

[0018] By arranging a first retaining ring groove in the half-shaft and a second retaining ring groove in the inner spline hole of the half-shaft gear, a retaining ring is clamped in both the first and second retaining ring grooves. By utilizing the arrangement of the retaining ring and the coordinated support and limitation of the bearing and the half-shaft, the radial runout and axial displacement of the half-shaft are greatly reduced. As a result, the half-shaft reduces the impact and irregular extrusion on the sealing ring, extends the service life of the sealing ring, and improves the operating sealing effect of the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of a disconnected drive front axle output end sealing structure according to an embodiment of the present utility model;

[0020] Figure 2 It is a partial cross-sectional enlarged schematic diagram of point I in 1;

[0021] Figure 3 It is an enlarged schematic diagram of the local section at point II in 1.

[0022] Explanation of the accompanying drawings: 1. Main reducer housing; 2. Mounting through hole; 3. Bearing; 4. Half shaft; 41. External spline; 42. First retaining ring groove; 5. Half shaft gear; 51. Second retaining ring groove; 6. Sealing ring; 61. Stop flange; 62. Dust lip; 63. Main lip; 64. Spring ring; 7. Dust cover; 71. First peripheral side wall; 72. Second peripheral side wall; 73. Annular groove; 74. Outer flange; 75. Sleeve structure; 8. Oil baffle; 9. Retaining ring. DETAILED DESCRIPTION

[0023] In order to make the present invention more clear, a disconnected drive front axle output end sealing structure of the present invention is further described below with reference to the accompanying drawings. The specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0024] like Figures 1 to 3The figure shows a disconnectable drive front axle output end sealing structure, comprising a final reducer housing 1. A mounting hole 2 is formed on one side of the housing. Depending on the specific drive axle structure, the mounting hole 2 can be a straight through hole or, as shown, a stepped through hole. A bearing 3 is mounted on the inner side of the mounting hole 2 (inside the final reducer housing 1). Bearing 3 is preferably a roller bearing to increase load-bearing capacity. An outwardly extending axle shaft 4 is sleeved within the inner ring of the bearing 3. The inner end of the axle shaft 4 (inside the final reducer housing 1) has a circle of external splines 41, which mate with the axle shaft gear 5 via these splines. A sealing ring 6 is mounted on the outer side of the mounting hole 2. The outer end of the sealing ring 6 has a stop flange 61 and an outwardly extending dust lip 62. The stop flange 61 abuts against the corresponding end surface of the final reducer housing 1, and the dust lip 62 extends a certain distance beyond the stop flange 61. The inner bore of the sealing ring 6 has a pair of main lips 63, both of which are elastically sealed to the journal of the axle shaft 4. A spring ring 64 is provided around the inner side of the main lip 63 to provide preload force for the main lip 63. Preferably, the sealing ring 6 is a skeleton-type sealing ring, i.e., a soft rubber coating (such as rubber) is applied to a hard skeleton. This skeleton-type structure provides strong support and enhances the connection between the sealing ring 6 and the mounting hole 2. For example, the sealing ring 6 and the mounting hole 2 can be matched with a small mechanical clearance, ensuring easy installation while improving the stability of the connection.

[0025] A dust cover 7 is coaxially fixedly connected to the journal of the axle shaft 4. This covers the exposed end surface of the sealing ring 6 and provides clearance engagement with the surface of the corresponding end of the final reducer housing 1. The dust cover 7 comprises a first circumferential wall 71 that provides clearance engagement with the circumferential surface of the stop flange 61, and a second circumferential wall 72 that elastically seals against the dust lip 62. Specifically, the dust cover 7 is formed by pressing sheet metal and has an overall disc-like shape. A sleeve structure 75, an annular groove 73, and an outer flange 74 are coaxially arranged along its diameter, from the inside to the outside. The sleeve structure 75, annular groove 73, and outer flange 74 all open to the same end. The first circumferential wall 71 is the inner sidewall of the outer flange 74, while the second circumferential wall 72 is the inner sidewall of the annular groove 73, further from its center. The depth of the annular groove 73 is greater than the mating area of ​​the dust lip 62, with a certain margin to prevent interference with the dust lip 62 during axial movement. The inner hole of the sleeve structure 75 is coaxially fixedly connected to the journal of the half-shaft 4 through interference fit, thereby achieving support, positioning and fixation of the dust cover 7.

[0026] Furthermore, to reduce the impact of gear oil inside the final reducer housing 1 on the sealing ring 6, an annular oil baffle 8 is provided within the mounting hole 2. This oil baffle 8 can be integrally formed with the final reducer housing 1 or separately fixed to the mounting hole 2. The inner bore of the oil baffle 8 provides a clearance fit with the journal of the axle shaft 4, and the oil baffle 8 is located between the bearing 3 and the sealing ring 6. The clearance between the inner bore of the oil baffle 8 and the journal of the axle shaft 4 should not be too large; generally, the clearance between the two should not exceed 2 mm per side.

[0027] In some embodiments, to reduce radial runout and axial displacement of the axle shaft, a first retaining ring groove 42 is provided in the middle region of the external spline 41 at the inner end of the axle shaft 4. A second retaining ring groove 51 is provided in the internal spline hole of the axle shaft gear 5. A retaining ring 9 is secured within both the first and second retaining ring grooves. The presence of the retaining ring 9 and the support provided by the bearing 3 and the axle shaft 4 significantly reduce radial runout and axial displacement of the axle shaft. Consequently, the axle shaft 4 reduces impact and irregular extrusion on the sealing ring 6, extending the service life of the sealing ring 6 and improving the operational sealing effectiveness of the sealing structure.

[0028] When this device is in operation, the main lip 63 forms an oil seal with the axle shaft 4. Simultaneously, the stop flange 61 and the first peripheral sidewall 71 form a primary dust seal, while the dust lip 62 and the second peripheral sidewall 72 form a secondary dust seal. Combined with the oil deflector 8, this reduces the amount of internal oil that could wash over the main lip 63, preventing oil leakage from the seal. Furthermore, if the primary dust seal fails, the secondary dust seal can still function. Overall, this sealing structure effectively improves the sealing and mud and sand protection of the disconnect drive front axle assembly.

[0029] The above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention may be implemented. Those skilled in the art will readily appreciate that other variations or modifications based on the above description are possible. It is not necessary and impossible to provide an exhaustive list of all possible embodiments. However, any obvious variations or modifications arising from the essence of the present invention remain within the scope of protection of the present invention.

Claims

1. A disconnecting drive front axle output end sealing structure, comprising a main reducer housing (1), a mounting through hole (2) provided on the main reducer housing (1), a bearing (3) provided on the inner side of the mounting through hole (2), an outwardly extending half shaft (4) connected in the bearing (3), an inner end of the half shaft (4) connected to a half shaft gear (5), a sealing ring (6) provided on the outer side of the mounting through hole (2), a main lip (63) of the sealing ring (6) being elastically sealed and connected to the journal of the half shaft (4), characterized in that: A dust cover (7) is coaxially fixedly connected to the journal of the half shaft (4), and the dust cover (7) covers the exposed end face of the sealing ring (6) and is clearance-matched with the surface of the main reducer housing (1); the outer end side of the sealing ring (6) has a stop flange (61) and an outward-turned dust lip (62), and the dust cover (7) has a first circumferential side wall (71) clearance-matched with the circumferential side face of the stop flange (61) and a second circumferential side wall (72) elastically sealingly matched with the dust lip (62).

2. The disconnectable drive front axle output end sealing structure according to claim 1, characterized in that: The dust cover (7) has an annular groove (73) and a coaxially arranged outer flange (74), the first peripheral side wall (71) is the inner side wall of the outer flange (74), and the second peripheral side wall (72) is the inner side wall of the annular groove (73) away from the center of the circle.

3. The disconnectable drive front axle output end sealing structure according to claim 2, characterized in that: The groove depth of the annular groove (73) is greater than the matching area size of the dust lip (62).

4. The disconnectable drive front axle output end sealing structure according to claim 3, characterized in that: The dust cover (7) has a sleeve structure (75) at its center, and the sleeve structure (75) is coaxially fixedly connected to the journal of the half shaft (4) through interference fit.

5. The disconnectable drive front axle output end sealing structure according to any one of claims 1 to 4, characterized in that: An annular oil baffle (8) is also provided in the mounting through hole (2). The inner hole of the oil baffle (8) is clearance-matched with the journal of the half shaft (4). The oil baffle (8) is located between the bearing (3) and the sealing ring (6).

6. The disconnectable drive front axle output end sealing structure according to claim 5, characterized in that: The unilateral fitting clearance between the inner hole of the oil baffle (8) and the journal of the half shaft (4) does not exceed 2 mm.

7. The disconnect drive front axle output end sealing structure according to claim 1, characterized in that: The inner end of the half shaft (4) has an external spline (41) and a first retaining ring groove (42), the inner spline hole of the half shaft gear (5) is provided with a second retaining ring groove (51), and the first and second retaining ring grooves are both secured with a retaining ring (9).

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