Bearing sealing ring of vehicle steering system

Abstract

The utility model discloses a bearing sealing ring of a vehicle steering system. The bearing sealing ring comprises a rubber ring and a framework which are coaxially arranged, the rubber ring is sequentially provided with a first inner lip and an outer lip from inside to outside; the framework is positioned between the first inner lip and the outer lip; a second inner lip is arranged at one end, far away from the bearing, of the first inner lip; an inner groove is formed in the outer wall of the bearing inner ring; the first inner lip abuts against the inner bottom of the inner groove. The second inner lip abuts against the side wall, close to the outer side of the bearing, of the inner groove. The sealing device has the advantages that the first inner lip and the second inner lip abut against the inner bottom and the side wall of the inner groove respectively and make contact with the inner ring of the bearing at any time under the action of elastic force to be pressed, media inside and outside the bearing are sealed, the sealing effect is better, and the sealing device is particularly applied to airtight sealing performance tests of automobile steering bearings.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing rings, and in particular relates to a bearing sealing ring for a vehicle steering system. Background Art

[0002] The main function of the bearing seal of the vehicle steering system is to prevent the leakage of lubricating oil and prevent external substances from entering the bearing. It is fixed on a ring or washer of the bearing through an annular cover composed of one or more parts and contacts with another ring or washer or forms a narrow labyrinth gap to achieve the sealing function. The structural design of the bearing seal is very critical. A good structural design can greatly improve the sealing performance and extend the service life of the seal. The air tightness test of the steering bearing is to fill one end of the steering bearing with high-pressure gas and detect whether there is high-pressure gas passing through the steering bearing axially at the other end of the steering bearing.

[0003] The Chinese patent document with publication number CN206694401U discloses a novel steering waterproof sealed bearing, including a bearing outer ring and a bearing inner ring. The bearing outer ring is a combination of a cylindrical side wall and an annular top wall. One end of the cylindrical side wall is connected to the annular top wall, and the connection forms an arc. The inner ring diameter of the annular top wall is the same as the inner diameter of the bearing inner ring. A rolling body is arranged between the bearing outer ring and the bearing inner ring. The rolling body is a ball-type rolling body, and the rolling body is kept in a working state by a retainer. An annular sealing ring is installed at the bottom end of the bearing inner ring, and a sealing ring groove is arranged on the inner side of the bearing outer ring. The outer side of the sealing ring is clamped with the sealing ring groove on the inner side of the bearing outer ring, and the inner side of the sealing ring is in close contact with the bearing inner ring, and an outer flange is formed.

[0004] The above patent scheme does not fully consider the air pressure sealing test that the sealing ring will withstand after the steering bearing is installed vertically. The bearing needs to undergo a 100% air tightness test before installation. The air pressure of the air tightness test is 300mbar and the pressure holding time is 20S. The above patent scheme only has basic sealing performance and the sealing effect is poor. Under the test conditions of specified air pressure and pressure holding time, the air tightness test often fails. Utility Model Content

[0005] In order to overcome the technical problem that bearings used in vehicle steering systems in the prior art need to be tested for air tightness, while conventional bearings fail the air tightness test due to poor sealing; one purpose of the utility model is to provide a vehicle steering system bearing sealing ring, by arranging a second inner lip on the outer side of the first inner lip, the first inner lip and the second inner lip respectively abut against the inner wall of the inner groove to achieve sealing, thereby improving the sealing effect.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a vehicle steering system bearing sealing ring, comprising a coaxially arranged rubber ring and a skeleton; the rubber ring is provided with a first inner lip and an outer lip from the inside to the outside; the skeleton is located between the first inner lip and the outer lip; wherein, a second inner lip is provided at one end of the first inner lip away from the bearing; an inner groove is provided on the outer wall of the inner ring of the bearing; the first inner lip abuts against the inner bottom of the inner groove; the second inner lip abuts against the side wall of the inner groove close to the outer side of the bearing.

[0007] The second inner lip and the first inner lip form a V-shaped opening, which is opposite to the bottom and side walls of the inner groove. The V-shaped opening opens to both sides under the action of pressure, thereby improving the abutment tightness between the second inner lip and the first inner lip in the inner groove, that is, improving the sealing performance, so that it can meet the air-tightness test.

[0008] Specifically, the diameter of the outer wall of the second inner lip is smaller than the diameter of the outer wall of the bearing inner ring.

[0009] That is, the main parts of the second inner lip and the first inner lip are all located in the inner groove, and the positive pressure given by the internal lubricating grease and the external dust and sand will not directly act on the second inner lip and the first inner lip, thereby improving the anti-deformation ability, that is, improving the sealing effect.

[0010] Specifically, the distance from the root of the second inner lip to the end of the first inner lip is smaller than the height of the second inner lip; the root of the second inner lip is the connection position between the second inner lip and the first inner lip.

[0011] Furthermore, an embedded groove is provided on the rubber ring; the outer wall of the frame is located in the embedded groove; and an extension portion engaged with the frame is provided on a side of the first inner lip away from the inner ring of the bearing.

[0012] Specifically, a first gap ring is coaxially arranged at one end of the rubber ring away from the bearing; and the first gap ring is located between the second inner lip and the skeleton.

[0013] Specifically, a second gap ring is coaxially arranged at one end of the rubber ring away from the bearing; and the second gap ring is located between the outer lip and the skeleton.

[0014] The first gap ring and the second gap ring increase the deformation capacity of the first inner lip and the outer lip, making it easier for the sealing ring to be installed in the shaft.

[0015] Furthermore, two reinforcement rings are provided on the side of the skeleton facing the bearing; the two reinforcement rings are respectively a low-wall ring portion located on the side of the skeleton close to the inner ring of the bearing and a high-wall ring portion located on the side of the skeleton away from the inner ring of the bearing.

[0016] Specifically, the length of the low-walled ring portion along the axial direction of the frame is smaller than the length of the high-walled ring portion along the axial direction of the frame.

[0017] Specifically, the high-walled ring portion is arranged along the axial direction of the skeleton; and the low-walled ring portion is arranged inclined toward the middle of the bearing.

[0018] Compared with the prior art, the beneficial effects of the utility model are: the first inner lip and the second inner lip are respectively pressed against the inner bottom and side wall of the inner groove, and are in contact with the inner ring of the bearing under pressure at any time under the action of elastic force, thereby sealing the medium inside and outside the bearing, and the sealing effect is better, especially for the air tightness test of the steering bearing used in the automobile. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the assembly structure of the utility model;

[0020] Figure 2 It is a radial cross-sectional schematic diagram of the utility model.

[0021] In the figure: 1, bearing inner ring; 11, inner groove; 2, bearing outer ring; 21, outer groove; 3, steel ball; 4, retaining frame; 5, rubber ring; 51, outer lip; 52, first inner lip; 521, extension; 53, second inner lip; 54, first gap ring; 55, embedded groove; 56, second gap ring; 6, skeleton; 61, low wall ring portion; 62, high wall ring portion. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0023] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of narrating the present invention and simplifying the description, 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 cannot be understood as limiting the specific protection scope of the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise specified and limited, the terms "setting", "installation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or two elements can be internally connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] See also Figure 1-Figure 2 A vehicle steering system bearing seal ring includes a coaxially arranged rubber ring 5 and a skeleton 6; the rubber ring 5 is provided with a first inner lip 52 and an outer lip 51 from the inside to the outside; the skeleton 6 is located between the first inner lip 52 and the outer lip 51; a second inner lip 53 is provided at one end of the first inner lip 52 away from the bearing.

[0027] The bearing comprises a bearing inner ring 1, a retaining frame 4, and a bearing outer ring 2 which are coaxially arranged in sequence from the inside to the outside; a plurality of steel balls 3 are evenly arranged in the circumferential direction in the retaining frame 4; inner grooves 11 are respectively provided at both ends of the outer wall of the bearing inner ring 1; outer grooves 21 are respectively provided at both ends of the inner wall of the bearing outer ring 2; the outer lip 51 is clamped in the outer groove 21; the first inner lip 52 abuts against the inner bottom of the inner groove 11; the second inner lip 53 abuts against the side wall of the inner groove 11 close to the outer side of the bearing.

[0028] The diameter of the outer wall of the second inner lip 53 is smaller than the diameter of the outer wall of the bearing inner ring 1; the distance from the root of the second inner lip 53 to the end of the first inner lip 52 is smaller than the height of the second inner lip 53; the root of the second inner lip 53 is the connection position between the second inner lip 53 and the first inner lip 52.

[0029] The rubber ring 5 is provided with an inner groove 55 on the side facing the bearing; the skeleton 6 is provided in the inner groove 55; the first inner lip 52 is provided with an extension portion 521 engaged with the skeleton 6 on the side away from the inner ring 1 of the bearing. A first clearance ring 54 is coaxially provided between the second inner lip 53 and the skeleton 6 at one end of the rubber ring 5 away from the bearing; a second clearance ring 56 is coaxially provided between the outer lip 51 and the skeleton 6 at one end of the rubber ring 5 away from the bearing.

[0030] The side of the skeleton 6 facing the bearing is provided with two reinforcement rings; the two reinforcement rings are respectively a low-walled ring portion 61 located on the side of the skeleton 6 close to the bearing inner ring 1 and a high-walled ring portion 62 located on the side of the skeleton 6 away from the bearing inner ring 1. The high-walled ring portion 62 is arranged along the axial direction of the skeleton 6; the low-walled ring portion 61 is arranged obliquely toward the middle of the bearing. The length of the low-walled ring portion 61 along the axial direction of the skeleton 6 is less than the length of the high-walled ring portion 62 along the axial direction of the skeleton 6.

[0031] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A vehicle steering system bearing seal ring, characterized in that: It comprises a coaxially arranged rubber ring and a skeleton; the rubber ring is provided with a first inner lip and an outer lip in sequence from the inside to the outside; the skeleton is located between the first inner lip and the outer lip; wherein a second inner lip is provided at one end of the first inner lip away from the bearing; an inner groove is provided on the outer wall of the inner ring of the bearing; the first inner lip abuts against the inner bottom of the inner groove; the second inner lip abuts against the side wall of the inner groove close to the outer side of the bearing.

2. The sealing ring according to claim 1, characterized in that: The diameter of the outer wall of the second inner lip is smaller than the diameter of the outer wall of the bearing inner ring.

3. The sealing ring according to claim 1 or 2, characterized in that: The distance between the root of the second inner lip and the end of the first inner lip is smaller than the height of the second inner lip; the root of the second inner lip is the connecting position of the second inner lip and the first inner lip.

4. The sealing ring according to claim 1 or 2, characterized in that: The rubber ring is provided with an embedded groove; the outer wall of the frame is located in the embedded groove; and an extension portion engaged with the frame is provided on a side of the first inner lip away from the inner ring of the bearing.

5. The sealing ring according to claim 1 or 2, characterized in that: A first gap ring is coaxially arranged at one end of the rubber ring away from the bearing; the first gap ring is located between the second inner lip and the skeleton.

6. The sealing ring according to claim 1 or 2, characterized in that: A second gap ring is coaxially arranged at one end of the rubber ring away from the bearing; the second gap ring is located between the outer lip and the frame.

7. The sealing ring according to claim 1 or 2, characterized in that: The side of the skeleton facing the bearing is provided with two reinforcement rings; the two reinforcement rings are respectively a low-wall ring portion located on the side of the skeleton close to the inner ring of the bearing and a high-wall ring portion located on the side of the skeleton away from the inner ring of the bearing.

8. The sealing ring according to claim 7, characterized in that: The length of the low-walled ring portion along the axial direction of the frame is smaller than the length of the high-walled ring portion along the axial direction of the frame.

9. The sealing ring according to claim 7, characterized in that: The high-walled ring portion is arranged along the axial direction of the frame; and the low-walled ring portion is arranged obliquely toward the middle of the bearing.

10. The sealing ring according to claim 3, characterized in that: A first gap ring is coaxially arranged at one end of the rubber ring away from the bearing; the first gap ring is located between the second inner lip and the skeleton.

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