Lubricating and sealing structure for steering shaft master pin

Abstract

The utility model discloses a steering shaft master pin lubricating and sealing structure which is arranged between an axle housing and a steering knuckle and comprises a sliding bearing, an O-shaped sealing ring and a sealing piece. The sliding bearing is sleeved on the main pin between the axle housing and the steering knuckle, and the sealing element is arranged on the outer side of the sliding bearing and is used for sealing a gap between the axle housing and a static ring of the sliding bearing and a gap between a movable ring and the static ring of the sliding bearing; the O-shaped sealing ring is arranged between the sliding bearing and the steering knuckle and seals a gap between a moving ring of the sliding bearing and the steering knuckle. Meanwhile, the dual-sealing effect of the O-shaped sealing ring and the sealing piece is adopted, so that all friction pairs at the position of the steering shaft main pin are located in a relatively closed space, the influence of external impurities on internal lubricating grease is effectively isolated, the sealing effect is better, and the sealing reliability of a product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing, in particular to a steering shaft kingpin lubricating sealing structure. Background Art

[0002] The normal operation of the steering function of the steering shaft or steering drive axle is crucial to the safe operation of the vehicle. The I-beam or bridge housing is connected to the steering knuckle through the kingpin, and a wear-resistant bushing or rolling assembly is arranged between them and grease is added to reduce friction to improve steering accuracy. However, sand and gravel often enter the rolling assembly or wear-resistant bushing during driving, reducing the reliability of the product.

[0003] At present, the common kingpin seal lubrication structure is to set a seal between the detent and the steering knuckle near the thrust bearing assembly, and set a simple rigid protection device on the outside of the thrust bearing assembly to lubricate and seal the kingpin; but this protection structure is relatively simple. On the one hand, it is difficult to effectively block external solid sand and gravel, which can easily cause sand and gravel to invade and cause scratches on the friction pair, affecting the sealing effect; on the other hand, the lack of reliable sealing components makes it easy for external mud and water to invade the friction pair, causing the lubricating medium to deteriorate, resulting in premature failure of the grease between the friction pairs, reducing the overall reliability of the product. Utility Model Content

[0004] In order to solve the above problems existing in the prior art, the utility model provides a steering shaft kingpin lubrication seal structure. The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0005] A steering shaft kingpin lubrication seal structure, the sealing structure is arranged between the bridge housing and the steering knuckle, and includes a sliding bearing, an O-ring and a sealing member; the sliding bearing is sleeved on the kingpin between the bridge housing and the steering knuckle, the sealing member is arranged on the outside of the sliding bearing, and seals the gap between the bridge housing and the stationary ring of the sliding bearing and between the moving ring and the stationary ring of the sliding bearing; the O-ring is arranged between the sliding bearing and the steering knuckle, and seals the gap between the moving ring of the sliding bearing and the steering knuckle.

[0006] Furthermore, the sealing member includes a support frame and a sealing ring, the support frame is fixed on the outside of the sealing ring, the sealing ring has a static sealing lip, a dynamic sealing lip and an axial sealing lip, the static sealing lip and the dynamic sealing lip seal the gap between the dynamic ring and the static ring of the sliding bearing; the axial sealing lip is used to seal the gap between the bridge housing and the static ring of the sliding bearing.

[0007] Preferably, the cross-sections of the support frame and the sealing ring are both L-shaped, the outer periphery of the upper end surface of the sliding bearing has a groove, the horizontal part of the sealing ring and the horizontal part of the support frame are both located in the groove, the axial sealing lip is located at the end of the horizontal part of the sealing ring, and seals the gap between the bridge housing and the stationary ring of the sliding bearing; the static sealing lip and the dynamic sealing lip are both located in the vertical part of the sealing ring, and the static sealing lip is located on the stationary ring of the sliding bearing, and the dynamic sealing lip is located on the dynamic ring of the sliding bearing.

[0008] Furthermore, there is a gap between the upper end surface of the support frame located in the groove and the lower end surface of the bridge housing; the height of the axial sealing lip is greater than the gap between the bridge housing and the stationary ring of the sliding bearing.

[0009] Furthermore, the static sealing lip and the dynamic sealing lip are both radially interference fit with the sliding bearing, and the inner diameter of the static sealing lip is smaller than the inner diameter of the dynamic sealing lip.

[0010] Furthermore, the sliding bearing and the kingpin are clearance-fitted, and there is a gap between the lower surface of the moving ring of the sliding bearing and the upper surface of the kingpin bushing.

[0011] Beneficial effects of the utility model:

[0012] 1. The utility model adopts the double sealing effect of O-ring and seal at the same time, so that each friction pair at the kingpin of the steering shaft is in a relatively closed space, effectively isolating the influence of external impurities on the internal grease, and the sealing effect is better, thereby improving the sealing reliability of the product, increasing the use time of the grease, and reducing the maintenance times;

[0013] 2. The utility model adopts a sliding bearing with a larger load-bearing capacity to achieve load-bearing, and the gap between the moving ring and the stationary ring of the sliding bearing and the gap between the bridge housing and the stationary ring of the sliding bearing are sealed by the same seal, which effectively reduces the number of seals used.

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 for Figure 1 Schematic diagram of the structure of part A;

[0017] Figure 3 It is a structural schematic diagram of the sealing ring;

[0018] Figure 4It is a schematic diagram of the cross-sectional structure of the sealing ring.

[0019] Description of reference numerals:

[0020] 1-bridge housing; 2-steering knuckle; 3-sliding bearing; 4-O-ring; 5-seal; 6-kingpin; 7-kingpin bushing; 3-1-static ring of sliding bearing; 3-2-dynamic ring of sliding bearing; 3-3-groove; 5-1-support frame; 5-2-seal ring; 5-2-1-static sealing lip; 5-2-2-dynamic sealing lip; 5-2-3-axial sealing lip. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with specific embodiments, but the implementation methods of the present invention are not limited thereto.

[0022] See also Figure 1~Figure 4 The embodiment of the utility model provides a steering shaft kingpin lubrication sealing structure, which is arranged between the bridge housing 1 and the steering knuckle 2, and specifically includes a sliding bearing 3, an O-ring 4 and a sealing member 5; the sliding bearing 3 is sleeved on the kingpin 6 between the bridge housing 1 and the steering knuckle 2, and the sealing member 5 is arranged on the outside of the sliding bearing 3, and seals the gap between the bridge housing 1 and the stationary ring 3-1 of the sliding bearing and the gap between the moving ring 3-2 of the sliding bearing and the stationary ring; the O-ring 4 is arranged between the sliding bearing 3 and the steering knuckle 2, and seals the gap between the moving ring 3-2 of the sliding bearing and the steering knuckle 2.

[0023] At the same time, the double sealing effect of the O-ring 4 and the seal 5 is adopted, so that each friction pair at the steering shaft kingpin 6 is in a relatively closed space, effectively isolating the influence of external impurities on the internal grease.

[0024] Specifically, the seal 5 includes a support frame 5-1 and a sealing ring 5-2, the support frame 5-1 is fixed on the outside of the sealing ring 5-2, the sealing ring 5-2 has a static sealing lip 5-2-1, a dynamic sealing lip 5-2-2 and an axial sealing lip 5-2-3, the static sealing lip 5-2-1 and the dynamic sealing lip 5-2-2 seal the gap between the dynamic ring 3-2 and the static ring of the sliding bearing; the axial sealing lip 5-2-3 is used to seal the gap between the bridge housing 1 and the static ring 3-1 of the sliding bearing.

[0025] The seal 5 can simultaneously seal the gap between the upper end of the sliding bearing 3 and the bridge housing 1 and the gap between the moving ring 3 - 2 and the stationary ring of the sliding bearing, thereby reducing the number of seals 5 used.

[0026] Furthermore, the cross-sections of the support frame 5-1 and the sealing ring 5-2 are both L-shaped, the outer periphery of the upper end surface of the sliding bearing 3 has a groove 3-3, the horizontal part of the sealing ring 5-2 and the horizontal part of the support frame 5-1 are both located in the groove 3-3, the axial sealing lip 5-2-3 is located at the end of the horizontal part of the sealing ring 5-2, and seals the gap between the bridge housing 1 and the stationary ring 3-1 of the sliding bearing; the static sealing lip 5-2-1 and the dynamic sealing lip 5-2-2 are both located in the vertical part of the sealing ring 5-2, and the static sealing lip 5-2-1 is located on the stationary ring 3-1 of the sliding bearing, and the dynamic sealing lip 5-2-2 is located on the dynamic ring 3-2 of the sliding bearing.

[0027] Since the surface of the bridge housing 1 that contacts the sliding bearing 3 has a high degree of flatness, the roughness of the other surfaces is high, and the sealing ring 5-2 cannot be sealed with the other surfaces of the bridge housing 1. Therefore, a groove 3-3 is provided on the outer periphery of the upper end surface of the sliding bearing 3, so that the horizontal part of the sealing ring 5-2 is located in the groove 3-3, and the sealing between the bridge housing 1 and the stationary ring 3-1 of the sliding bearing is achieved through the axial sealing lip 5-2-3 located at the end of the horizontal part.

[0028] In addition, in order to prevent the bridge housing 1 from contacting the support frame 5-1, thereby generating an axial force on the entire seal 5 and causing damage to the seal 5, it is designed that there is a gap between the upper end face of the support frame 5-1 located in the groove 3-3 and the lower end face of the bridge housing 1, thereby avoiding pressure on the support frame 5-1. At the same time, in order to ensure the sealing reliability of the axial sealing lip 5-2-3, the height of the axial sealing lip 5-2-3 is designed to be greater than the gap between the bridge housing 1 and the stationary ring 3-1 of the sliding bearing, so that the axial sealing lip 5-2-3 is subjected to a certain extrusion force between the bridge housing 1 and the sliding bearing 3, thereby ensuring the sealing effect.

[0029] In addition, the static sealing lip 5-2-1 and the dynamic sealing lip 5-2-2 are both radially interference fit with the sliding bearing 3 to ensure the installation reliability and sealing reliability of the seal 5. Since the static sealing lip 5-2-1 mainly provides the shaft holding force for the installation of the seal 5, the inner diameter of the static sealing lip 5-2-1 is smaller than the inner diameter of the dynamic sealing lip 5-2-2. At the same time, in order to increase its shaft holding force, the static sealing lip 5-2-1 is designed as a multi-lip structure.

[0030] Furthermore, the sliding bearing 3 and the kingpin 6 are clearance-matched, and there is a clearance between the lower surface of the moving ring 3-2 of the sliding bearing and the upper surface of the kingpin bushing 7, to ensure that the sliding bearing 3 can rotate smoothly without generating friction with the kingpin bushing 7.

[0031] Preferably, the support frame 5 - 1 is integrally stamped from steel material or injection-molded from high-strength composite material to ensure the reliability of the support frame 5 - 1 .

[0032] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A steering shaft kingpin lubrication seal structure, characterized in that: The sealing structure is arranged between the bridge housing and the steering knuckle, and includes a sliding bearing, an O-ring and a sealing member; the sliding bearing is mounted on the kingpin between the bridge housing and the steering knuckle, the sealing member is arranged on the outside of the sliding bearing, and seals the gap between the bridge housing and the stationary ring of the sliding bearing and between the moving ring and the stationary ring of the sliding bearing; the O-ring is arranged between the sliding bearing and the steering knuckle, and seals the gap between the moving ring of the sliding bearing and the steering knuckle.

2. The steering shaft kingpin lubrication seal structure according to claim 1, characterized in that: The sealing component includes a support frame and a sealing ring, wherein the support frame is fixed on the outside of the sealing ring, and the sealing ring has a static sealing lip, a dynamic sealing lip and an axial sealing lip. The static sealing lip and the dynamic sealing lip seal the gap between the dynamic ring and the static ring of the sliding bearing; the axial sealing lip is used to seal the gap between the bridge housing and the static ring of the sliding bearing.

3. The steering shaft kingpin lubrication seal structure according to claim 2, characterized in that: The cross-sections of the support frame and the sealing ring are both L-shaped, the upper end surface of the sliding bearing has a groove on its periphery, the horizontal part of the sealing ring and the horizontal part of the support frame are both located in the groove, the axial sealing lip is located at the end of the horizontal part of the sealing ring, and seals the gap between the bridge housing and the stationary ring of the sliding bearing; the static sealing lip and the dynamic sealing lip are both located in the vertical part of the sealing ring, and the static sealing lip is located on the stationary ring of the sliding bearing, and the dynamic sealing lip is located on the dynamic ring of the sliding bearing.

4. The steering shaft kingpin lubrication seal structure according to claim 3, characterized in that: There is a gap between the upper end surface of the support frame located in the groove and the lower end surface of the bridge housing; the height of the axial sealing lip is greater than the gap between the bridge housing and the stationary ring of the sliding bearing.

5. The steering shaft kingpin lubrication seal structure according to claim 3, characterized in that: The static sealing lip and the dynamic sealing lip are both radially interference fit with the sliding bearing, and the inner diameter of the static sealing lip is smaller than the inner diameter of the dynamic sealing lip.

6. The steering shaft kingpin lubrication seal structure according to claim 1, characterized in that: The sliding bearing and the kingpin are clearance-matched, and there is a gap between the lower surface of the moving ring of the sliding bearing and the upper surface of the kingpin bushing.

Images