Commercial vehicle hub box type oil seal suitable for working conditions of high load and high rotating speed

Abstract

The utility model discloses a commercial vehicle hub box type oil seal suitable for working conditions of high load and high rotating speed, which comprises an outer oil seal assembly and an inner oil seal assembly, and the inner oil seal assembly comprises an inner oil seal framework and an inner oil seal rubber body; the inner oil seal framework comprises a bottom wall, a first side wall and a second side wall, and the roughness of the inner side surface of the first side wall reaches Ra0.2-Ra0.8; the inner oil seal rubber body is arranged on the outer side of the first side wall, and a first large wave-shaped sealing rib is arranged on the inner oil seal rubber body in the circumferential direction; the outer oil seal assembly comprises an outer oil seal framework, a first outer oil seal rubber body, a second outer oil seal rubber body and a third outer oil seal rubber body; the novel dustproof scheme is adopted, the dustproof capacity of the oil seal is enhanced, the sealing performance of the oil seal is improved, the service life of the oil seal is prolonged, and the oil seal is particularly suitable for high-load and high-rotating-speed working conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to the sealing technical field of vehicle, specifically to a commercial vehicle hub box type oil seal suitable for high load and high speed working conditions. BACKGROUND

[0002] At present, in the automobile industry, the application of rubber sealing element is the most extensive. In medium and heavy axle, the existing technology has the problems of difficult assembly of oil seal and shaft, easy oil leakage, and the surface roughness of the shaft cannot reach the appropriate surface roughness range Ra0.1.6~Ra0.4μm required by sealing due to the limitation of processing technology, which aggravates the rapid wear of the lip and reduces the service life.

[0003] The environment used by medium and heavy axle is often in mine, rural road and mine, and the past single dustproof port structure has poor effect on preventing mud and dust, and after the mud and sand enter the sealing surface, the oil seal lip is early worn, which reduces the service life of the oil seal.

[0004] In order to solve the above problems, the Chinese patent file "self-sealing maintenance-free box type oil seal" (patent application number: 201821857675.8) discloses a self-sealing maintenance-free box type oil seal, which reduces the roughness requirement of the shaft and the hardness requirement of the rotating shaft, and saves the manufacturing cost of the customer.

[0005] However, with the popularization of new energy vehicles, the rapid development of electric vehicles and hybrid electric vehicles, traditional axle and high-performance electric drive axle are moving towards high-end, and the design requirement is 500,000 kilometers / 5 years, and the quality assurance requirement is 3 million kilometers / 3 years, especially in the working condition of high load and high speed, the ordinary structure sealing ring cannot provide reliable sealing effect and prevent the invasion of foreign impurities. CONTENT OF THE UTILITY MODEL

[0006] In view of the defects in the prior art, the purpose of the utility model is to provide a commercial vehicle hub box type oil seal suitable for high load and high speed working conditions, which adopts a new dustproof scheme, enhances the dustproof ability of the oil seal, improves the sealing performance of the oil seal, prolongs the service life of the oil seal, and is especially suitable for high load and high speed working conditions.

[0007] The utility model discloses a kind of commercial vehicle wheel hub box type oil seals suitable for high load and high speed operating conditions, including outer oil seal assembly and inner oil seal assembly, the inner oil seal assembly includes inner oil seal framework and inner oil seal rubber body;The section of the inner oil seal framework is U-shaped, including bottom wall, the proximal end of the bottom wall is bent upwards to form first side wall, the distal end of bottom wall is bent upwards to form second side wall, and bottom wall, first side wall and second side wall form cavity;The roughness of the inner side surface of the first side wall reaches Ra0.2-Ra0.8;The inner oil seal rubber body is arranged on the outside of first side wall, and the inner oil seal rubber body is provided with first large wave type sealing rib along the circumference;The outer oil seal assembly includes outer oil seal framework, first outer oil seal rubber body, second outer oil seal rubber body and third outer oil seal rubber body;The outer oil seal framework includes first horizontal edge in the cavity, the distal end of the first horizontal edge is bent upwards and extends to form first vertical edge, the upper end of the first vertical edge is bent outwards to form second horizontal edge after passing through the cavity, the distal end of the second horizontal edge is bent upwards and extends to form second vertical edge, the upper end of the second vertical edge is bent outwards to form inclined edge, and the upper end of the inclined edge is bent upwards to form third vertical edge, the height of the third vertical edge is higher than first side wall, and the upper end of the third vertical edge is provided with guide surface;The lower end of the first outer oil seal rubber body is wrapped around the proximal end of the first horizontal edge, and the inner side upper portion of the first outer oil seal rubber body is provided with oil seal lip for abutting the inner side of the first side wall, the inner side lower portion of the first outer oil seal rubber body is provided with auxiliary lip for abutting the inner side of the first side wall, and the inner side of the auxiliary lip is provided with 6-8 equal parts of convex points;The second outer oil seal rubber body covers the outer side wall of the first vertical edge, and the lower end of the second outer oil seal rubber body extends to the bottom surface of the first horizontal edge;The third outer oil seal rubber body covers the outer side wall of the second vertical edge and the bottom surface of the second horizontal edge, and the part of the third outer oil seal rubber body located on the second vertical edge is provided with second large wave type sealing rib along the circumference.

[0008] Further improvement lies in that the inner oil seal rubber body is provided with 60-90 equal parts of flanges along the axial direction.

[0009] Further improvement lies in that it further includes connecting framework, the upper end of the first side wall is provided with mounting groove on the inner side, and the connecting framework includes horizontal part, the proximal end of the horizontal part is inserted into the mounting groove, and the distal end of the horizontal part is bent downwards and extends to form vertical part.

[0010] Further improvement lies in that the upper end of the first side wall is bent inwards to form flanging part.

[0011] Further improvement lies in that the upper portion of the outer side of the first outer oil seal rubber body is provided with limiting groove, and oil seal spring is installed in the limiting groove.

[0012] Further improvement lies in that the part of the first outer oil seal rubber body located on the bottom surface of the first horizontal edge is provided with first side lip.

[0013] Further improvement lies in that the part of the second outer oil seal rubber body located at the bottom surface of the first horizontal side is provided with a second side lip.

[0014] Further improvement lies in that the part of the third outer oil seal rubber body located at the bottom surface of the second horizontal side is provided with a clamping opening, and a sealing ring made of polytetrafluoroethylene is arranged in the clamping opening; the upper end of the second side wall extends into the clamping opening and abuts against the sealing ring.

[0015] Further improvement lies in that the second outer oil seal rubber body and the third outer oil seal rubber body are integrated.

[0016] Further improvement lies in that the inner oil seal framework is made of high-strength steel SAPH 440.

[0017] The utility model discloses beneficial effect lies in:

[0018] The utility model discloses adopt new dustproof scheme, has strengthened oil seal dustproof muddy water. Dust capacity to improve the sealing performance of oil seal, prolong the service life of oil seal, is especially applicable to high load and high speed working condition. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the structure schematic view of commercial vehicle wheel hub box type oil seal in the utility model embodiment;

[0020] Figure 2 It is the partial enlarged view of commercial vehicle wheel hub box type oil seal in the utility model embodiment;

[0021] Figure 3 It is the structure schematic view of inner oil seal assembly in the utility model embodiment;

[0022] Figure 4 It is the structure schematic view of outer oil seal assembly in the utility model embodiment;

[0023] Figure 5 It is the structure schematic view of outer oil seal framework in the utility model embodiment;

[0024] Figure 6 It is the connection schematic view of each outer oil seal rubber body in the utility model embodiment;

[0025] Figure 7 It is the structure schematic view of connecting framework in the utility model embodiment.

[0026] Reference signs:

[0027] 1-inner oil seal assembly;11-inner oil seal framework;111-bottom wall;112-first side wall;113-second side wall;114-mounting groove;115-flange part;12-inner oil seal rubber body;121-first large wave type sealing rib;122-flange;

[0028] 2-outer oil seal assembly; 21-outer oil seal skeleton; 211-first horizontal edge; 212-first vertical edge; 213-second horizontal edge; 214-second vertical edge; 215-inclined edge; 216-third vertical edge; 217-guide surface; 22-first outer oil seal rubber body; 221-oil seal lip; 222-secondary lip; 223-first side lip; 224-limiting groove; 225-bump; 23-second outer oil seal rubber body; 231-second side lip; 24-third outer oil seal rubber body; 241-second large wavy sealing rib; 242-bayonet; 25-oil seal spring;

[0029] 3-connection skeleton; 31-horizontal part; 32-vertical part;

[0030] 4-sealing ring. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, and the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout.

[0032] In the description of the present application, it should be noted that, for the orientation words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0033] In addition, the terms "first" and "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the "first" and "second" features defined can explicitly or implicitly include one or more of the features, and the meaning of "several" and "a number" in the description of the present application is two or more than two, unless otherwise explicitly specified.

[0034] The technical scheme of the present application and its beneficial effects will be clearer and more explicit through the further description of the specific embodiments of the present application in combination with the drawings of the specification. The description of the embodiments by referring to the drawings is exemplary and is intended to explain the present application, and cannot be understood as limiting the present application.

[0035] Referring to Figure 1and Figure 2 As shown, this utility model embodiment provides a commercial vehicle wheel hub-type oil seal suitable for high load and high speed conditions, including an outer oil seal assembly 2 and an inner oil seal assembly 1.

[0036] See Figure 3 As shown, the inner oil seal assembly 1 includes an inner oil seal skeleton 11 and an inner oil seal rubber body 12. The inner oil seal skeleton 11 has a U-shaped cross-section, including a bottom wall 111. The proximal end of the bottom wall 111 is bent upward to form a first side wall 112, and the distal end of the bottom wall 111 is bent upward to form a second side wall 113. The bottom wall 111, the first side wall 112, and the second side wall 113 form a cavity. The inner surface roughness of the first side wall 112 reaches Ra0.2-Ra0.8 (by turning), and the surface quality meets the requirements of the rotating shaft. Specifically, the upper end of the first side wall 112 is bent inward to form a flange 115. The inner oil seal skeleton 11 is made of high-strength steel SAPH 440 and does not require heat treatment.

[0037] The inner oil seal rubber body 12 is located on the outer side of the first side wall 112, and the inner oil seal rubber body 12 is provided with a first large wave-shaped sealing rib 121 along the circumference for easy installation; specifically, the inner oil seal rubber body 12 is provided with 60-90 equal flanges 122 along the axial direction to increase rotational friction and prevent sliding with the shaft.

[0038] See Figure 4 As shown, the outer oil seal assembly 2 includes an outer oil seal skeleton 21, a first outer oil seal rubber body 22, a second outer oil seal rubber body 23, and a third outer oil seal rubber body 24.

[0039] See Figure 5 As shown, the outer oil seal skeleton 21 includes a first horizontal side 211 located in the cavity. The distal end of the first horizontal side 211 bends upward and extends to form a first vertical side 212. The upper end of the first vertical side 212 extends outward and bends horizontally to form a second horizontal side 213. The distal end of the second horizontal side 213 bends upward and extends to form a second vertical side 214. The upper end of the second vertical side 214 bends outward at an angle to form a sloping side 215. The upper end of the sloping side 215 bends upward to form a third vertical side 216. The height of the third vertical side 216 is higher than that of the first sidewall 112. A guide surface 217 is provided at the upper end of the third vertical side 216 to reduce the springback phenomenon after the oil seal is assembled.

[0040] See Figure 6As shown, the lower outer side of the first outer oil seal rubber body 22 wraps around the proximal end of the first transverse side 211, and the upper inner side of the first outer oil seal rubber body 22 is provided with an oil seal lip 221 for abutting against the inner side of the first sidewall 112. The lower inner side of the first outer oil seal rubber body 22 is provided with a secondary lip 222 for abutting against the inner side of the first sidewall 112, and the inner side of the secondary lip 222 is provided with 6-8 equally spaced protrusions 225 to prevent a vacuum from forming between the main and secondary lips, thus preventing oil leakage caused by pumping oil to the air side. Specifically, the upper outer side of the first outer oil seal rubber body 22 is provided with a limiting groove 224, and an oil seal spring 25 is installed in the limiting groove 224 to provide a permanent radial force to the oil seal lip. The portion of the first outer oil seal rubber body 22 located on the bottom surface of the first transverse side 211 is provided with a first side lip 223.

[0041] The second outer oil seal rubber body 23 covers the outer side wall of the first vertical side 212, and the lower end of the second outer oil seal rubber body 23 extends to the bottom surface of the first horizontal side 211; specifically, the part of the second outer oil seal rubber body 23 located on the bottom surface of the first horizontal side 211 is provided with a second side lip 231, which together with the first side lip 223 forms multiple anti-mud and water lips to improve the resistance to mud and water.

[0042] The third outer oil seal rubber body 24 covers the outer wall of the second vertical side 214 and the bottom surface of the second horizontal side 213. The portion of the third outer oil seal rubber body 24 located on the second vertical side 214 has a second large wave-shaped sealing rib 241 arranged circumferentially for easy installation. Specifically, the portion of the third outer oil seal rubber body 24 located on the bottom surface of the second horizontal side 213 has a retaining groove 242. A sealing ring 4 made of polytetrafluoroethylene (PTFE) is installed inside the retaining groove 242. Its frictional torque during movement is very small, reducing the influence of axial stress on torque. The sealing ring not only prevents the entry of external mud and sand but also transfers force from the inner oil seal to the outer oil seal to ensure the successful installation of the oil seal assembly. The upper end of the second side wall 113 extends into the retaining groove 242 and abuts against the sealing ring 4. The second outer oil seal rubber body 23 and the third outer oil seal rubber body 24 are an integral structure.

[0043] The sealing lip does not directly contact the shaft surface: This design reduces the machining requirements of the shaft, simplifies the machining process, and reduces the maintenance cost of the equipment; filling the space between the sealing lip and the shaft with grease provides stable sealing performance and reduces friction and energy consumption; no special treatment is required for the rotating shaft or specific opposing interfaces, installation is simple, the sealing lip will not be damaged, it can be used in harsh working environments, and is particularly suitable for high-load and high-speed conditions.

[0044] See Figure 2 and Figure 7As shown, it also includes a connecting frame 3. The upper inner side of the first sidewall 112 is provided with a mounting groove 114. The connecting frame 3 includes a horizontal part 31. The proximal end of the horizontal part 31 is inserted into the mounting groove 114, and the distal end of the horizontal part 31 is bent downward and extended to form a vertical part 32.

[0045] The assembly method of this utility model is as follows:

[0046] The inner oil seal rubber body and the inner oil seal skeleton are molded and vulcanized into a whole using a mold, and then machined.

[0047] The outer oil seal rubber body and the outer oil seal skeleton are molded and vulcanized together, followed by two-stage vulcanization, lip cutting, cleaning, and spring fitting.

[0048] After the sealing ring is installed into the outer oil seal assembly, oil is applied, then the inner oil seal assembly and connecting skeleton are installed, and finally all parts are connected together by rolling.

[0049] In the description of this specification, references to terms such as "an embodiment," "preferred," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. Illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] Based on the above description of the structure and principle, those skilled in the art should understand that this utility model is not limited to the specific embodiments described above. Improvements and substitutions based on this utility model using techniques known in the art all fall within the protection scope of this utility model and should be defined by the claims.

Claims

1. A wheel hub-type oil seal suitable for high-load and high-speed operating conditions in commercial vehicles, comprising an outer oil seal assembly (2) and an inner oil seal assembly (1), characterized in that: The inner oil seal assembly (1) includes an inner oil seal skeleton (11) and an inner oil seal rubber body (12); The cross-section of the inner oil seal skeleton (11) is U-shaped, including a bottom wall (111). The proximal end of the bottom wall (111) is bent upward to form a first side wall (112), and the distal end of the bottom wall (111) is bent upward to form a second side wall (113). The bottom wall (111), the first side wall (112), and the second side wall (113) form a cavity. The inner surface roughness of the first side wall (112) reaches Ra0.2-Ra0.

8. The inner oil seal rubber body (12) is disposed on the outside of the first side wall (112), and the inner oil seal rubber body (12) is provided with a first large wave-shaped sealing rib (121) along the circumferential direction; The outer oil seal assembly (2) includes an outer oil seal skeleton (21), a first outer oil seal rubber body (22), a second outer oil seal rubber body (23), and a third outer oil seal rubber body (24); The external oil seal skeleton (21) includes a first horizontal side (211) located in the cavity. The distal end of the first horizontal side (211) bends upward and extends to form a first vertical side (212). The upper end of the first vertical side (212) extends outward and bends horizontally to form a second horizontal side (213). The distal end of the second horizontal side (213) bends upward and extends to form a second vertical side (214). The upper end of the second vertical side (214) bends outward and forms a sloping side (215). The upper end of the sloping side (215) bends upward to form a third vertical side (216). The height of the third vertical side (216) is higher than that of the first sidewall (112). The upper end of the third vertical side (216) is provided with a guide surface (217). The lower outer side of the first outer oil seal rubber body (22) wraps around the proximal end of the first transverse side (211), and the upper inner side of the first outer oil seal rubber body (22) is provided with an oil seal lip (221) for abutting against the inner side of the first sidewall (112), and the lower inner side of the first outer oil seal rubber body (22) is provided with a secondary lip (222) for abutting against the inner side of the first sidewall (112), and the inner side of the secondary lip (222) is provided with 6-8 equal protrusions (225); The second outer oil seal rubber body (23) covers the outer side wall of the first vertical side (212), and the lower end of the second outer oil seal rubber body (23) extends to the bottom surface of the first horizontal side (211); The third outer oil seal rubber body (24) covers the outer wall of the second vertical side (214) and the bottom surface of the second horizontal side (213), and the portion of the third outer oil seal rubber body (24) located on the second vertical side (214) is provided with a second large wave-shaped sealing rib (241) along the circumferential direction.

2. The wheel hub-type oil seal for commercial vehicles under high load and high speed conditions as described in claim 1, characterized in that: The inner oil seal rubber body (12) is provided with 60-90 equal flanges (122) along the axial direction.

3. The wheel hub-type oil seal for commercial vehicles under high load and high speed conditions as described in claim 1, characterized in that: It also includes a connecting frame (3), and an installation groove (114) is provided on the inner side of the upper end of the first sidewall (112). The connecting frame (3) includes a horizontal part (31), the proximal end of the horizontal part (31) is inserted into the installation groove (114), and the distal end of the horizontal part (31) is bent downward and extended to form a vertical part (32).

4. The wheel hub-type oil seal for commercial vehicles under high load and high speed conditions as described in claim 1, characterized in that: The upper end of the first sidewall (112) is bent inward to form a flange (115).

5. The wheel hub-type oil seal for commercial vehicles under high load and high speed conditions as described in claim 1, characterized in that: A limiting groove (224) is provided on the upper outer side of the first outer oil seal rubber body (22), and an oil seal spring (25) is installed in the limiting groove (224).

6. The wheel hub-type oil seal for commercial vehicles under high load and high speed conditions as described in claim 1, characterized in that: The first outer oil seal rubber body (22) is provided with a first side lip (223) on the part located on the bottom surface of the first transverse side (211).

7. The wheel hub-type oil seal for commercial vehicles under high load and high speed conditions as described in claim 1, characterized in that: The second outer oil seal rubber body (23) is provided with a second side lip (231) on the part located on the bottom surface of the first transverse side (211).

8. The wheel hub-type oil seal for commercial vehicles under high load and high speed conditions as described in claim 1, characterized in that: The third outer oil seal rubber body (24) is provided with a bayonet (242) on the bottom surface of the second transverse side (213), and a sealing ring (4) made of polytetrafluoroethylene is provided in the bayonet (242); the upper end of the second side wall (113) extends into the bayonet (242) and abuts against the sealing ring (4).

9. The wheel hub-type oil seal for commercial vehicles under high load and high speed conditions as described in claim 1, characterized in that: The second outer oil seal rubber body (23) and the third outer oil seal rubber body (24) are an integral structure.

10. The wheel hub-type oil seal for commercial vehicles under high load and high speed conditions according to claim 1, characterized in that: The inner oil seal skeleton (11) is made of high-strength steel SAPH 440.

Images