Thrust roller bearing

Abstract

A thrust roller bearing comprises a shaft ring, a roller, a seat ring and a protective cover, the shaft ring and the seat ring are buckled in the protective cover, and the roller is clamped between the shaft ring and the seat ring. A chamfer is arranged on the side, close to the protective cover, of the outer wall face of the seat ring. The first end of the shield covers the axial outer end face of the shaft washer; the second end of the protective cover covers the chamfer; the protective cover sequentially comprises a first sealing lip arranged at the first end, a protective cover body and a second sealing lip arranged at the second end. The first sealing lip is in interference fit connection with the assembled main pin shaft; the second sealing lip is in interference fit with the chamfer face so that the second sealing lip can wrap the chamfer. According to the protective cover, the contact area of the protective cover and the main pin shaft is sealed through the first sealing lip; the second sealing lip in a rolloff form is in interference fit with the seat ring, so that the exterior of the bearing is sealed; the shaft washer is in interference fit with the main pin shaft; and the integral sealed bearing is formed through three-point sealing. The bearing structure is simplified, and invasion of external impurities and foreign matters is reduced.

Description

Technical Field

[0001] The utility model relates to the field of thrust bearings, in particular to a thrust roller bearing. Background Art

[0002] Thrust roller bearings are mostly sealed with sealing rings, such as Figure 1 As shown, the shaft ring and the seat ring are sealed with the main shaft through the sealing ring, so that the inner wall surface of the bearing and the main shaft are sealed. In addition, a step is provided on the outer wall surface of the end surface of the seat ring to place the end surface steel skeleton sealing ring to protect the external seal of the bearing from external pollution.

[0003] The bearings in the prior art have a complex structure and use many sealing rings for sealing, so a new bearing sealing technical solution is urgently needed to simplify the structure of the thrust roller bearing. Utility Model Content

[0004] The utility model aims to provide a thrust roller bearing with simple structure and effective sealing.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A thrust roller bearing, characterized in that it comprises a shaft ring, a roller, a seat ring and a shield, wherein the shaft ring and the seat ring are buckled in parallel in the shield, and the roller is sandwiched between the shaft ring and the seat ring;

[0007] The outer wall surface of the seat ring is provided with a chamfer on one side close to the shield;

[0008] The first end cover of the shield is provided to the axial outer end surface of the shaft ring;

[0009] The second end cover of the shield is set to a chamfer;

[0010] The shield sequentially comprises a first sealing lip arranged at a first end, a shield body and a second sealing lip arranged at a second end;

[0011] The first sealing lip is connected to the assembled kingpin shaft by interference fit, and the shaft ring is connected to the kingpin shaft by interference fit;

[0012] The second sealing lip is interference fit with the chamfered surface so that the second sealing lip wraps the chamfer.

[0013] Furthermore, the first sealing lip and the second sealing lip are fixed to both ends of the shield body as a whole;

[0014] The first sealing lip is arranged on the radial inner side of the shield body;

[0015] The second sealing lip is arranged on the inner wall surface of the shield body, and the second sealing lip wraps the seat ring.

[0016] Further, the second sealing lip comprises a sealing body attached to the inner wall surface of the second end of the shield and a skirt protruding from the sealing body;

[0017] The outer wall surface of the seat ring is attached to the sealing body;

[0018] The end of the sealing body extends along the chamfered surface to form the skirt, and the skirt is interference-fitted with the chamfer.

[0019] Furthermore, the first sealing lip wraps around the edge of the shield body, so that the first sealing lip is disposed between the kingpin shaft and the shield body in the radial direction, and the first sealing lip is disposed between the shaft ring and the edge of the shield body in the axial direction.

[0020] Furthermore, the inner wall surface of the first sealing lip is chamfered.

[0021] Furthermore, the first sealing lip and the second sealing lip are both made of rubber.

[0022] In the above technical solution, the thrust roller bearing of the utility model has the following beneficial effects:

[0023] The utility model seals the contact area between the shield and the kingpin shaft through the interference fit of the first sealing lip and the kingpin shaft; the outside of the bearing is sealed through the interference fit of the second sealing lip in the form of rolled edge and the seat ring; the shaft ring and the kingpin shaft are interference fit, and the above three-point sealing forms an integral sealed bearing. It has the advantages of simplifying the bearing structure and more effectively preventing the intrusion of foreign objects such as water, dust, and particles from the outside, which causes early fatigue failure of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a structural schematic diagram of a bearing in the prior art;

[0026] Figure 2 A schematic diagram of the structure of the thrust bearing provided by the utility model;

[0027] Figure 3 This is a schematic structural diagram of the second sealing lip provided by the utility model.

[0028] Reference numerals:

[0029] Shaft washer 1 , roller 2 , seat washer 3 , shield 4 , chamfer 31 , first sealing lip 41 , second sealing lip 42 , sealing body 421 , skirt 422 . DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] It should be noted that the terms "above", "one end", "upper", etc. used in this article indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. Similar expressions are only for the purpose of illustration, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in addition, the terms "one part", "two parts", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] like Figure 2 A thrust roller bearing shown includes a shaft ring 1, a roller 2, a seat ring 3 and a shield 4. The shaft ring 1 and the seat ring 3 are buckled in the shield 4 in parallel, and the roller 2 is sandwiched between the shaft ring 1 and the seat ring 3.

[0033] The structure of sandwiching the roller 2 between the shaft ring 1 and the seat ring 3 is a prior art, which can be seen in the Chinese utility model patent with application number CN201120067263.6, application date March 15, 2011, and name "Thrust Tapered Roller Bearing".

[0034] This embodiment mainly improves the sealing structure of the bearing, wherein a chamfer 31 is provided on the outer wall surface of the seat ring 3 close to the shield 4 to form a chamfered surface, so that the outer surface of the seat ring 3 is thin outside and thick inside.

[0035] The shield 4 is a shield structure, and its cross section is optionally 7-shaped as a whole. The shield 4 has two ends, and its first end is set to the axial outer end surface of the shaft ring 1; the second end of the shield 4 is set to the chamfer 31. The shield 4 and the shaft ring, the main shaft pin and the seat ring are realized by the first sealing lip and the second sealing lip.

[0036] The shield 4 sequentially includes a first sealing lip 41 provided at a first end, a shield body, and a second sealing lip 42 provided at a second end.

[0037] After the first end cover is set to the axial outer end surface of the shaft ring 1, it contacts the assembled kingpin shaft through the first sealing lip 41. The shaft ring 1 is connected with the kingpin shaft through the interference fit of the first sealing lip. The first sealing lip tightly wraps the main shaft pin to play a sealing role.

[0038] The second sealing lip 42 and the chamfered surface formed by the chamfer 31 are interference fit so that the second sealing lip 42 wraps the chamfer 31. In this way, the second end of the shield 4 is sealed and connected to the seat ring. Optionally, it is not required that the second sealing lip 42 completely covers the chamfered surface formed by the chamfer 31. Figure 1 As shown, the end of the second sealing lip 42 covers the middle position of the chamfered surface. The second sealing lip and the seat ring are processed by rolling to make the chamfer of the second sealing lip and the seat ring have an interference fit (tight fit), which is one of the conditions to ensure the overall sealing of the bearing.

[0039] Preferably, the first sealing lip 41 and the second sealing lip 42 are fixed to both ends of the shield body as a whole; optionally, the shield body is processed first, and the first sealing lip 41 and the second sealing lip 42 are formed in the form of melted rubber after cooling.

[0040] The first sealing lip 41 is arranged on the radial inner side of the shield body, and the first end of the shield body close to the shaft ring is sleeved on the outside of the first sealing lip; the second sealing lip 42 is arranged on the inner wall surface of the shield body, and the second sealing lip 42 wraps the seat ring 3. In order to increase the wrapping force of the second sealing lip 42, one side of the second sealing lip 42 is attached to the inner wall surface of the shield body, and the shape of the other side can be selected to be similar to the chamfer 31, but it must be interference fit with the chamfer 31, so that the inner diameter of the second sealing lip 42 is smaller than the outer diameter of the chamfer 31. Because the shield body is a shell structure with a certain elastic deformation ability, the kingpin shaft squeezes the second sealing lip 42 to deform, so as to achieve the sealing of the second sealing lip 42 and the kingpin shaft.

[0041] Preferably, the second sealing lip 42 includes a sealing body 421 attached to the inner wall surface of the second end of the shield body and a skirt 422 protruding from the sealing body 421;

[0042] The outer wall surface of the seat ring 3 is attached to the sealing body 421;

[0043] The end of the sealing body 421 extends along the chamfer 31 to form a skirt 422 , and the skirt 422 is interference-fitted with the chamfer 31 .

[0044] like Figure 3 As shown, the second sealing lip 42 includes two parts, one part is the skirt 422 which is in contact with the chamfer 31 and is in the shape of a conical ring; the other part is the sealing body 421 which is in contact with the outer surface of the seat ring 3 which is not provided with the chamfer 31, that is, a circle of cylindrical surface of the seat ring 3. At the same time, the sealing body 421 is attached to the inner wall surface of the shield body to fix the second sealing lip; the skirt 422 mainly plays the role of sealing the seat ring.

[0045] Preferably, the first sealing lip 41 wraps around the edge of the shield body, so that the first sealing lip 41 is sandwiched between the kingpin shaft and the shield body in the radial direction, and the first sealing lip 41 is sandwiched between the shaft ring 1 and the edge of the shield body in the axial direction. Figure 2 As shown, the first sealing lip 41 is provided with a groove, and the edge of the shield body is inserted into the groove, which further increases the sealing between the shaft ring, the shield body and the kingpin shaft.

[0046] Preferably, the inner wall surface of the first sealing lip 41 is provided with a chamfer 411. That is, the outer inner diameter along the axial direction of the bearing is large, and the inner inner diameter is small; thus, the first sealing lip is easy to assemble on the kingpin shaft and also easy to guide the kingpin shaft; in addition, the sealing lip of this structure can effectively reduce friction resistance and friction heat.

[0047] Preferably, the first sealing lip 41 and the second sealing lip 42 are both made of rubber.

[0048] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A thrust roller bearing, characterized in that: It comprises a shaft ring (1), a roller (2), a seat ring (3) and a shield (4), wherein the shaft ring (1) and the seat ring (3) are buckled in parallel in the shield (4), and the roller (2) is sandwiched between the shaft ring (1) and the seat ring (3); A chamfer (31) is formed on the outer wall surface of the seat ring (3) on a side close to the shield (4); The first end cover of the protective cover (4) is arranged on the axial outer end surface of the shaft ring (1); The second end cover of the protective cover (4) is arranged to a chamfer (31); The shield (4) comprises in sequence a first sealing lip (41) arranged at a first end, a shield body and a second sealing lip (42) arranged at a second end; The first sealing lip (41) is connected to the assembled kingpin shaft by interference fit, and the shaft ring (1) is connected to the kingpin shaft by interference fit; The second sealing lip (42) is interference-fitted with the chamfer (31) so that the second sealing lip (42) wraps around the chamfer (31).

2. The thrust roller bearing according to claim 1, characterized in that: The first sealing lip (41) and the second sealing lip (42) are fixed to both ends of the shield body as a whole; The first sealing lip (41) is arranged on the radial inner side of the shield body; The second sealing lip (42) is arranged on the inner wall surface of the shield body, and the second sealing lip (42) wraps the seat ring (3).

3. The thrust roller bearing according to claim 1, characterized in that: The second sealing lip (42) comprises a sealing body (421) attached to the inner wall surface of the shield (4) and a skirt (422) protruding from the sealing body (421); The outer wall surface of the seat ring (3) is attached to the sealing body (421); The end of the sealing body (421) extends along the direction of the chamfer (31) to form the skirt (422), and the skirt (422) is interference-fitted with the chamfer (31).

4. A thrust roller bearing according to claim 1, characterized in that: The first sealing lip (41) wraps around the edge of the shield body so that the first sealing lip (41) is clamped between the kingpin shaft and the shield body in the radial direction and between the shaft ring (1) and the edge of the shield body in the axial direction.

5. A thrust roller bearing according to claim 4, characterized in that: The inner wall surface of the first sealing lip (41) is chamfered.

6. A thrust roller bearing according to claim 1, characterized in that: The first sealing lip (41) and the second sealing lip (42) are both made of rubber.

Images