CN205101565U - Combination oil seal structure - Google Patents

Abstract

The utility model provides a combined oil seal structure, which belongs to the technical field of electric vehicles. It solves the problem of how to improve the service life of the oil seal. The combined oil seal structure includes a skeleton oil seal body, the skeleton is sleeved on the inner end of the oil seal body, the outer end of the oil seal body is provided with a protective bowl, the protective bowl includes a ring body, the inner circumference of the ring body has an inner convex ring, and the outer circumference of the ring body It has an outer convex ring, an annular radial sealing lip on the inner peripheral surface of the oil seal body, and the radial sealing lip abuts against the inner convex ring, and an annular protective lip and shaft on the outer end surface of the oil seal body The axial sealing lip is located inside the protective lip, the protective lip is against the outer peripheral surface of the outer flange, and the axial sealing lip is against the ring body. The combined oil seal structure improves the waterproof and anti-sediment performance and service life of the oil seal by adopting the U-shaped protective bowl structure with the inner diameter main sealing surface, the end auxiliary sealing surface and the outer radial protective sealing surface and the sealing lip on the oil seal body. .

Description

A combined oil seal structure

technical field

The utility model belongs to the technical field of electric vehicles and relates to a seal for a hub motor, in particular to a combined oil seal structure.

Background technique

Electric vehicles have been widely used and popularized because of their advantages such as simple operation, convenient use, low cost, energy saving and environmental protection. However, due to its direct exposure to wind, sun, rain, dust and other special operating environments, it will encounter various failures during use, and the failure of the electric wheel hub motor is one of them. The main reason for the failure of the hub motor is that the oil seal function used for protection fails or the sealing performance is poor, which causes external media such as sand and water to enter the interior of the hub motor, resulting in damage to the electrical components and other components inside the hub motor. Therefore, the service life of the hub motor oil seal and the ability to prevent water and sand are particularly important for the hub motor. At present, the electric wheel hub motor seals on the market basically directly use the traditional rotary lip seal oil seal. The main function of this type of oil seal is to prevent the lubricating oil inside the mechanism from leaking out. The sealing lip is in contact with the lubricating oil. The working environment is better and the life is longer. The purpose of setting the oil seal in the wheel hub motor is to prevent external harmful substances from entering the motor and damaging the internal components of the motor. The lip is not only not lubricated, but also directly contacts harmful substances such as dust, rainwater, and sand. The two are just the opposite. Therefore, this type of oil seal is easy to fail when it is directly used on the hub motor of the electric wheel, and its life is extremely short.

In order to solve the above existing problems, such as the Chinese patent [Application No.: 201410283738.3; Application Publication No.: CN104074982A] discloses a new electric wheel hub motor oil seal, which is composed of a rubber compound lip, a metal skeleton and a hoop spring. The skeleton is tightly bonded to the rubber compound lip through vulcanization, and the hoop spring is installed in the spring groove of the rubber compound lip. Grease is filled between the rubber compound lips. The outermost dustproof lip of the rubber compound lip is designed as a centrifugal structure.

However, the above wheel hub motor oil seal also has the following defects: the above wheel hub motor oil seal will be in direct contact with external media such as sediment and water during use, which will easily cause the aging of the rubber compound lip and shorten the service life, thus causing the waterproof and sediment proof of the oil seal. The function fails, which eventually leads to the failure of the hub motor.

Contents of the invention

The purpose of the utility model is to solve the above problems in the existing technology, and propose a combined oil seal structure. The technical problem solved by the utility model is how to improve the service life of the oil seal.

The purpose of this utility model can be achieved through the following technical solutions: a combined oil seal structure, including a cover-shaped skeleton and a ring-shaped oil seal body, characterized in that the skeleton is sleeved on the inner end of the oil seal body, so The outer end of the oil seal body is provided with a protective bowl, the protective bowl includes a ring-shaped ring body, the inner circumference of the ring body has a ring-shaped inner convex ring, and the outer circumference of the ring body has a ring-shaped ring The outer convex ring, the inner peripheral surface of the oil seal body has an annular radial sealing lip, and the radial sealing lip is against the inner convex ring, and the outer end surface of the oil seal body has an annular radial sealing lip. The protective lip and the axial sealing lip, the axial sealing lip is located on the inner side of the protective lip, the protective lip abuts against the outer peripheral surface of the outer flange, and the axial sealing lip abuts against the ring physically.

According to the operating conditions of the electric wheel hub motor, the combined oil seal structure adopts the U-shaped protective bowl structure with the inner diameter main sealing surface, the end auxiliary sealing surface and the outer radial protective sealing surface and the cooperation of the sealing lip on the oil seal body, which improves The waterproof and anti-sediment performance and service life of the oil seal are guaranteed. Specifically, the radial sealing lip on the oil seal body and the inner convex ring of the protective bowl form the inner diameter main sealing surface, the axial sealing lip on the oil seal body and the bottom of the protective bowl form the end auxiliary sealing surface, and the oil seal body on the The protective lip and the outer convex ring of the protective bowl form an outer radial protective sealing surface, thereby increasing the sealing area of the entire oil seal structure and improving the waterproof and sediment-proof sealing performance of the oil seal structure; at the same time, the oil seal is sealed by designing the protective bowl. The axial sealing lip and radial sealing lip on the body are protected in the protective bowl, which prevents the sealing lip from being exposed to the sun and rain, and prevents external media such as sediment and water from directly contacting the sealing lip, thereby improving the service life of the oil seal structure. In addition, the oil seal body is designed to rotate and seal inside the protective bowl. After the inner surface of the protective bowl replaces the outer circular surface of the original motor shaft as the sealing surface, the surface hardness and roughness of the protective bowl can be independently adjusted according to the friction coefficient of the oil seal. There are contradictions between the surface hardness of the oil seal sealed motor shaft is too high and the shaft is easily broken, and the friction coefficient of low hardness is large and the life of the oil seal is short.

In the above combined oil seal structure, the protective lip is inclined toward the axial sealing lip, and the axial sealing lip is inclined toward the protective lip. Through the design of the protective lip and the axial sealing lip, the protective sleeve is subjected to the opposite pressing force of the two, and is tightly held between the protective lip and the axial sealing lip, which improves the waterproof and anti-sediment here of tightness.

In the above combined oil seal structure, the radial sealing lip is inclined towards the outer end of the oil seal body. Through the design of the radial sealing lip, the cooperation between the radial sealing lip and the protective sleeve is made closer, thereby improving the sealing performance here.

In the above combined oil seal structure, a sealing cavity is formed between the oil seal body and the protective bowl, and the sealing cavity is filled with lubricating grease. The lubricating grease plays a lubricating role, which not only reduces the starting torque for the rotation of the oil seal body, but also improves the service life of the oil seal structure.

In the above combined oil seal structure, the outer peripheral surface of the oil seal body has a flange, the outer ring edge of the skeleton is embedded in the flange, and the inner ring edge of the skeleton has an inwardly bent bend part, the bent part is embedded in the oil seal body. The design of the bending part not only makes the frame and the oil seal body more firm, but also benefits the sealing of the outer ring and the end cover hole and the anti-corrosion performance of the outer ring body, thereby improving the service life of the oil seal.

Compared with the prior art, the combined oil seal structure has the following advantages: the combined oil seal structure adopts the U-shaped protective bowl structure with the inner diameter main sealing surface, the end auxiliary sealing surface and the outer radial protective sealing surface and seals on the oil seal body. The cooperation of the lip improves the waterproof and anti-sediment performance and service life of the oil seal, so that the electric wheel hub motor can work normally and effectively for a long time, and the service life of the electric vehicle is improved.

Description of drawings

Fig. 1 is a cross-sectional view of the combined oil seal structure in the first embodiment.

Fig. 2 is a schematic diagram of the structure of the protective bowl in the first embodiment.

Fig. 3 is an assembly application diagram of the combined oil seal structure in the first embodiment.

Fig. 4 is a cross-sectional view of the combined oil seal structure in the second embodiment.

Fig. 5 is a structural schematic diagram of further protection application of the combined oil seal structure.

In the figure, 1. skeleton; 11. bending part; 2. oil seal body; 21. radial sealing lip; 22. protective lip; 23. axial sealing lip; 24. flange; 3. protective bowl; 31. ring 32. Inner convex ring; 33. Outer convex ring; 4. Seal chamber; 5. Grease; 6. Motor shaft; 7. Motor end cover; 8. Protective cover; 9. Rubber layer.

detailed description

The following are specific embodiments of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

Embodiment one:

The combined oil seal structure includes skeleton 1, bending part 11, oil seal body 2, radial sealing lip 21, protective lip 22, axial sealing lip 23, flange 24, protective bowl 3, ring body 31, inner flange 32, Outer convex ring 33, sealing cavity 4, lubricating grease 5.

Specifically, as shown in Figure 1, the combined oil seal structure includes a cover-shaped skeleton 1 and a ring-shaped oil seal body 2, the skeleton 1 is sleeved on the inner end of the oil seal body 2, and the outer peripheral surface of the oil seal body 2 has The flange 24 is embedded in the flange 24 with the outer edge of the frame 1 , and the inner edge of the frame 1 has an inwardly bent bent portion 11 , and the bent portion 11 is embedded in the oil seal body 2 . The outer end of the oil seal body 2 is provided with a protective bowl 3 .

As shown in FIG. 2 , the protective bowl 3 includes an annular ring body 31 , the inner periphery of the ring body 31 has an annular inner bead 32 , and the outer periphery of the ring body 31 has an annular outer bead 33 . The inner peripheral surface of the oil seal body 2 has an annular radial sealing lip 21 , and the radial sealing lip 21 is inclined toward the outer end of the oil seal body 2 . The radial sealing lip 21 bears against the inner collar 32 . The outer end surface of the oil seal body 2 has an annular protective lip 22 and an axial sealing lip 23, the axial sealing lip 23 is located inside the protective lip 22, the protective lip 22 is inclined towards the axial sealing lip 23, and the axial sealing lip 23 is inclined towards the protective lip 22. The protective lip 22 abuts against the outer peripheral surface of the outer collar 33 , and the axial sealing lip 23 abuts against the ring body 31 . A sealing cavity 4 is formed between the oil seal body 2 and the protective bowl 3 , and the sealing cavity 4 is filled with grease 5 .

As shown in Figure 3, when the above-mentioned combined oil seal structure is applied to the electric wheel hub motor, its working principle is as follows: the inner convex ring 32 of the above-mentioned protective bowl 3 is sleeved on the motor shaft 6 and tightly fitted with the motor shaft 6, the above-mentioned The frame 1 is closely matched with the inner hole of the motor end cover 7. When the motor end cover 7 rotates, it will drive the frame 1 and the oil seal body 2 to rotate, and the protection bowl 3 and the shaft will not move. At this time, the gap between the oil seal body 2 and the protection bowl 3 A dynamic seal is formed, and both the radial sealing lip 21 and the axial sealing lip 23 work inside the protective bowl 3 . The lubricating grease 5 in the sealing cavity 4 plays the role of lubricating and protecting the sealing lip.

As shown in Figure 5, when the above combined oil seal is applied to the electric wheel hub motor, a protective cover 8 can also be buckled on the end of the motor end cover 7, so that it forms another protective isolation outside the combined oil seal. Prevent harmful substances such as rainwater and sediment from contacting the combined oil seal, thereby further improving the service life of the combined oil seal.

Embodiment two:

The technical solution in this embodiment is basically the same as the technical solution in Embodiment 1, the difference is that, as shown in Figure 4, in this embodiment, the skeleton 1 and the protective bowl 3 are covered with a rubber layer 9, which improves the The static sealing performance between the oil seal combination and the inner hole of the motor shaft 6 and the motor end cover 7.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Although the framework 1, the bending part 11, the oil seal body 2, the radial sealing lip 21, the protective lip 22, the axial sealing lip 23, the flange 24, the protective bowl 3, the ring body 31, and the inner convex ring are frequently used in this paper. 32. Outer convex ring 33, sealing chamber 4, grease 5, motor shaft 6, motor end cover 7, protective cover 8, rubber layer 9 and other terms, but the possibility of using other terms is not excluded. These terms are only used to describe and explain the essence of the utility model more conveniently; interpreting them as any kind of additional limitation is contrary to the spirit of the utility model.

Claims (6)

1. A combined oil seal structure, comprising a cover-shaped skeleton (1) and a ring-shaped oil seal body (2), characterized in that the skeleton (1) is sleeved on the inner end of the oil seal body (2), The outer end of the oil seal body (2) is provided with a protective bowl (3), and the protective bowl (3) includes an annular ring body (31), and the inner periphery of the ring body (31) has an annular The inner flange (32) of the ring body (31) has an annular outer flange (33) on the outer periphery, and the inner peripheral surface of the oil seal body (2) has an annular radial sealing lip (21), the radial sealing lip (21) abuts against the inner collar (32), and the outer end surface of the oil seal body (2) has a ring-shaped protective lip (22) and an axial seal lip (23), the axial sealing lip (23) is located inside the protective lip (22), and the protective lip (22) abuts against the outer peripheral surface of the outer flange (33), the The axial sealing lip (23) bears against the ring body (31). 2. The combined oil seal structure according to claim 1, characterized in that, the protective lip (22) is inclined toward the axial sealing lip (23), and the axial sealing lip (23) is inclined toward the protective lip (22) . 3. The combined oil seal structure according to claim 1, characterized in that, the radial sealing lip (21) is inclined towards the outer end of the oil seal body (2). 4. The combined oil seal structure according to claim 1, 2 or 3, characterized in that a sealing cavity (4) is formed between the oil seal body (2) and the protective bowl (3), and the sealing cavity (4 ) is filled with grease (5). 5. The combined oil seal structure according to claim 1, 2 or 3, characterized in that there is a flange (24) on the outer peripheral surface of the oil seal body (2), and the edge of the outer ring of the skeleton (1) is embedded Set in the flange (24), the inner ring edge of the skeleton (1) has an inwardly bent bent portion (11), and the bent portion (11) is embedded in the oil seal body (2 )Inside. 6. The combined oil seal structure according to claim 1, 2 or 3, characterized in that, both the skeleton (1) and the protective bowl (3) are covered with a rubber layer (9).