Rotating shaft lip-shaped oil seal resistant to high-flex working condition

Abstract

The utility model relates to a rotating shaft lip-shaped oil seal resistant to a high-flex working condition, and belongs to the technical field of oil seals. Comprising sealing piece rubber, a framework is arranged in the sealing piece rubber, a sealing lip is arranged on the inner side, close to the direction of a sealing cavity, of the sealing piece rubber, an annular extension spring is arranged on the radial outer side of the sealing lip, a supporting ring is further arranged on the inner side of the sealing lip, and a sealing dustproof lip connected with the sealing piece rubber is further arranged on the lower side of the supporting ring. The high-temperature-resistant thermoplastic supporting ring made of the special high polymer materials is assembled on the lip portion, the correct relation between the surface of the main lip and the shaft can be kept, uneven stress of the lip caused by high shaft deflection, shaft-hole deviation (STBM) and dynamic run-out (DRO) is mainly borne by the supporting ring, and therefore the stability of the stress of the lip is guaranteed.

Description

Technical Field

[0001] The utility model relates to a rotary shaft lip-shaped oil seal capable of resisting high-flexion working conditions, belonging to the technical field of oil seals. Background Art

[0002] Evidence of shaft deflection or misalignment manifests as severe, one-sided wear or an irregular wear pattern around the circumference of the seal lip. Wear or offset loads on the seal lip can severely shorten seal life, increase torque loads, and overheat. While the corrugated design can reduce some of the forces, the seal lip can still experience uneven forces, leading to one-sided or irregular wear and shortening seal life.

[0003] The Chinese utility model patent, currently published with the patent number CN216951661U, discloses a rotary oil seal resistant to large eccentricity. The seal comprises a frame and a main lip. The frame comprises an I-shaped outer frame and an L-shaped inner frame, which are connected as a whole by an N-shaped rubber body. The outer side of the outer frame is coated with a rubber body, and the rubber body wrapped around the inner side of the inner frame is provided with a rubber main lip. The outer side of the main lip is provided with a spring groove, and an annular tension spring is installed in the spring groove. A dust lip is provided below the main lip. The patent allows the lip portion to float radially to accommodate high shaft deflection, shaft-to-bore deviation (STBM), and dynamic runout (DRO). However, due to high shaft deflection, shaft-to-bore deviation (STBM), and dynamic runout (DRO), the lip is unevenly stressed, and the offset load is entirely borne by the lip. Although the corrugated design can reduce some of the applied force, the sealing lip still suffers from uneven stress, resulting in unilateral wear or irregular wear, which in turn shortens the service life. Therefore, it is urgent to solve the above technical problems. Utility Model Content

[0004] Technical purpose: In order to overcome the deficiencies in the prior art, the utility model provides a rotary shaft lip oil seal that is resistant to high flexure working conditions.

[0005] A rotary shaft lip oil seal resistant to high flexing working conditions includes a sealing rubber, a skeleton is provided inside the sealing rubber, and a sealing lip is provided on the inner side close to the sealing cavity, an annular tension spring is provided on the radial outer side of the sealing lip, a support ring is also provided on the inner side of the sealing lip, and a sealing dust lip connected to the sealing rubber is provided on the lower side of the support ring.

[0006] Furthermore, the support ring is a planar support ring, a triangular support ring or a wave-shaped support ring.

[0007] Furthermore, the sealing rubber is composed of an I-shaped sealing rubber and an N-shaped sealing rubber connected end to end, the skeleton is an L-shaped skeleton, the I-shaped sealing rubber is provided with an L-shaped skeleton, and the N-shaped sealing rubber is provided with a sealing lip on the inner side close to the sealing cavity.

[0008] Furthermore, the sealing rubber is composed of a U-shaped sealing rubber, the skeleton is a U-shaped skeleton, a U-shaped skeleton is provided on the U-shaped sealing rubber, and a sealing lip is provided on the inner side of the U-shaped sealing rubber close to the sealing cavity.

[0009] Furthermore, the support ring is made of a high-temperature resistant thermoplastic support ring.

[0010] Technical effects of this utility model:

[0011] First, this high-deflection oil seal successfully completed over 1,000 hours of dynamic hot oil bench testing with no leakage at an STBM of 1.80 mm, a DRO of 1.0 mm, a rotational speed of 1,000 sfpm (5 m / s), and a total eccentricity (STBM + DRO) of 1.5 mm. This high-deflection oil seal is suitable for most applications with large shaft deflection, runout, or deviation. The eccentricity of this seal is three times that of traditional radial lip seals, and it can be manufactured with a variety of rubber materials to accommodate varying fluid media and temperature conditions.

[0012] Secondly, the present invention helps maintain the correct relationship between the main lip surface and the shaft by assembling a high-temperature resistant thermoplastic support ring made of special polymer material on the lip part. High shaft deflection, shaft-hole deviation (STBM) and dynamic runout (DRO) will cause uneven force on the lip, which will be mainly borne by the support ring, thereby ensuring the stability of the lip force. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of embodiment 1 of the present utility model;

[0014] Figure 2 This is a schematic structural diagram of the second embodiment of the present utility model;

[0015] Figure 3 This is a structural diagram of embodiment 3 of the present utility model;

[0016] Figure 4 This is a structural diagram of the fourth embodiment of the present utility model;

[0017] Figure 5 This is a structural diagram of embodiment 5 of the present utility model.

[0018] In the figure, 1. U-shaped sealing rubber; 2. L-shaped frame; 3. Sealing lip; 4. Annular tension spring; 5. Flat support ring; 6. Sealing dust lip; 7. U-shaped frame; 8. I-shaped sealing rubber; 9. N-shaped sealing rubber; 10. Triangular support ring; 11. Wave-shaped support ring. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1 To the attached Figure 5 The principles and features of the present invention are described, and the examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0020] Example 1

[0021] like Figure 1 As shown, a rotary shaft lip oil seal resistant to high flexure working conditions includes a sealing rubber, which is composed of an I-shaped sealing rubber 8 and an N-shaped sealing rubber 9 connected end to end. The skeleton is an L-shaped skeleton 2, and the L-shaped skeleton 2 is provided inside the I-shaped sealing rubber 8. The N-shaped sealing rubber 9 is provided with a sealing lip 3 on the inner side close to the sealing cavity, and an annular tension spring 4 is provided on the radial outer side of the sealing lip 3. A support ring is also provided on the inner side of the sealing lip 3, and a sealing dust lip 6 connected to the sealing rubber is also provided on the lower side of the support ring.

[0022] The support ring is made of a high-temperature resistant thermoplastic support ring.

[0023] Example 2

[0024] like Figure 2 As shown, a rotary shaft lip oil seal resistant to high flexing working conditions includes a sealing rubber, which is composed of a U-shaped sealing rubber 1. A U-shaped skeleton 7 is provided on the U-shaped sealing rubber 1. A sealing lip 3 is provided on the inner side of the U-shaped sealing rubber 1 close to the sealing cavity. An annular tension spring 4 is provided on the radial outer side of the sealing lip 3. A support ring is also provided on the inner side of the sealing lip 3, and a sealing dust lip 6 connected to the sealing rubber is also provided on the lower side of the support ring.

[0025] The support ring is made of a high-temperature resistant thermoplastic support ring.

[0026] Example 3

[0027] like Figure 3 As shown, the support ring is a planar support ring 5 .

[0028] Example 4

[0029] like Figure 4 As shown, the support ring is a triangular support ring 10 .

[0030] Example 5

[0031] like Figure 5 As shown, the support ring is a wave-shaped support ring 11.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rotary shaft lip oil seal resistant to high flexure working conditions, characterized by: The invention comprises a sealing rubber, wherein a skeleton is provided inside the sealing rubber, and a sealing lip (3) is provided on the inner side close to the sealing cavity, an annular tension spring (4) is provided on the radial outer side of the sealing lip (3), a support ring is provided on the inner side of the sealing lip (3), and a sealing dustproof lip (6) connected to the sealing rubber is provided on the lower side of the support ring.

2. The rotary shaft lip oil seal resistant to high flexure working conditions according to claim 1, characterized in that: The support ring is a planar support ring (5), a triangular support ring (10) or a wave-shaped support ring (11).

3. The rotary shaft lip oil seal resistant to high flexure working conditions according to claim 1, characterized in that: The sealing rubber is composed of an I-shaped sealing rubber (8) and an N-shaped sealing rubber (9) connected end to end; the skeleton is an L-shaped skeleton (2); the L-shaped skeleton (2) is provided inside the I-shaped sealing rubber (8); and the N-shaped sealing rubber (9) is provided with a sealing lip (3) on the inner side close to the sealing cavity.

4. The rotary shaft lip oil seal resistant to high flexure working conditions according to claim 1, characterized in that: The sealing rubber is composed of a U-shaped sealing rubber (1), the skeleton is a U-shaped skeleton (7), the U-shaped sealing rubber (1) is provided with a U-shaped skeleton (7), and the inner side of the U-shaped sealing rubber (1) close to the sealing cavity is provided with a sealing lip (3).

5. The rotary shaft lip oil seal resistant to high flexure working conditions according to claim 2, characterized in that: The support ring is made of a high-temperature resistant thermoplastic support ring.

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