Shaft sealing ring of steering engine

Abstract

The utility model discloses a shaft sealing ring of a steering engine. The shaft sealing ring comprises a sealing ring body, a metal framework and a supporting ring. The contact part of the sealing ring body and the input shaft comprises a first lip, a second lip and a third lip, the first lip is closest to the top of the sealing ring, and the first lip, the second lip and the third lip are in interference fit with the shaft; the metal framework is embedded in the sealing ring body; the supporting ring is fixed to the inner ring of the sealing ring body and is in clearance fit with a shaft. The utility model has better sealing performance and supporting performance.

Description

Technical Field

[0001] This utility model relates to the field of automotive steering technology, specifically to a shaft seal ring for a steering gear. Background Technology

[0002] In automotive steering systems, the primary functions of the shaft seal are sealing and support. The shaft seal is press-fitted into the sensor cover from above, with an interference fit. The inner ring of the shaft seal has a lip design, also with an interference fit to the input shaft, preventing radial runout of the input shaft and ensuring that external water and impurities cannot penetrate the steering system from between the input shaft and the sensor cover. This achieves excellent waterproofing and corrosion resistance. The sensor is housed inside the casing, requiring a high level of sealing. Water ingress can cause short circuits, leading to signal failure, loss of power steering, and an abnormally heavy steering feel. Additionally, it helps to suppress noise caused by input shaft wobble.

[0003] like Figure 1 As shown, the traditional shaft seal 1.2 is press-fitted with the sensor cover 1.3 and has an interference fit with the input shaft 1.1. The shaft seal is relatively short and has only two lips inside, achieving adequate waterproofing and corrosion resistance. However, when a longer input shaft needs to be designed to match the customer interface, the traditional shaft seal 1.2 has low rigidity and cannot effectively support the input shaft 1.1. This causes the input shaft to wobble easily under radial force after the steering gear is assembled into the vehicle, leading to noise problems. Furthermore, when the input shaft wobbles, external impurities can easily enter the steering gear through the shaft seal, corroding the internal components and causing steering gear failure. Therefore, providing a shaft seal with higher rigidity is of great significance and practical value in improving its sealing and support performance, and is a technical problem facing the industry. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a shaft seal ring for a steering gear, including a seal ring body, a metal skeleton, and a support ring; the contact point between the seal ring body and the input shaft includes a first lip, a second lip, and a third lip, with the first lip being closest to the top of the seal ring, and the first, second, and third lips being interference-fitted with the input shaft; the metal skeleton is embedded in the seal ring body; the support ring is fixed to the inner ring of the seal ring body and has a clearance fit with the input shaft.

[0005] Preferably, the first lip has the largest interference fit, and the third lip has the smallest interference fit.

[0006] Preferably, the outer edge of the support ring is provided with an annular boss that matches the groove on the inner wall of the sealing ring.

[0007] Preferably, the support ring is made of polyamide.

[0008] Preferably, the clearance between the support ring and the input shaft is 0.05-0.1 mm.

[0009] Preferably, the height of the support ring is 7mm.

[0010] Preferably, the metal frame is L-shaped and made of phosphated metal.

[0011] Preferably, the top of the sealing ring body has a groove to reduce the rigidity of the top of the sealing ring body.

[0012] Preferably, the sealing ring body is made of rubber.

[0013] Preferably, the sealing ring body, metal skeleton, and support ring are formed by secondary vulcanization.

[0014] Compared with the prior art, the sealing ring of this utility model has better sealing and support properties. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0016] Figure 1 A schematic diagram of a traditional shaft seal being assembled into a steering gear assembly;

[0017] Figure 2 This is a schematic diagram of the shaft seal ring of Example 1 being assembled into the steering gear assembly;

[0018] Figure 3 This is an exploded view of the shaft seal ring of Example 1;

[0019] Figure 4 This is an isometric view of the shaft seal ring in Example 1; Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can fully understand other advantages and technical effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through different specific embodiments, and the details in this specification can also be applied based on different viewpoints, with various modifications or changes made without departing from the overall design concept of the utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. The following exemplary embodiments of this utility model can be implemented in many different forms and should not be construed as being limited to the specific embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of this utility model thorough and complete, and to fully convey the technical solutions of these exemplary embodiments to those skilled in the art.

[0021] Example 1

[0022] like Figure 2 The diagram shown is a schematic of the shaft seal ring after it is assembled into the steering gear assembly in this embodiment. The shaft seal ring 2.2 is press-fitted into the sensor cover 2.3 from top to bottom.

[0023] like Figures 2 to 4 As shown, the steering gear shaft seal ring provided in this embodiment includes a seal ring body 3.2, a metal skeleton 3.1, and a support ring 3.3. The contact area between the seal ring body 3.2 and the input shaft 2.1 includes a first lip, a second lip, and a third lip. The first lip is closest to the top of the seal ring, and the first, second, and third lips are interference-fitted with the input shaft 2.1. The metal skeleton 3.1 is embedded within the seal ring body 3.2. The support ring 3.3 is fixed to the inner ring of the seal ring body 3.2 and has a clearance fit with the input shaft 2.1. The first lip has the largest interference fit, and the third lip has the smallest interference fit, to balance the seal and prevent excessive interference fit from affecting the input shaft torque and feel.

[0024] The top of the sealing ring body 3.2 has some material removed to form multiple grooves, which reduces the rigidity of the top of the sealing ring body so that the torque between it and the input shaft 2.1 is not too large and affects the feel and hysteresis.

[0025] The metal frame 3.1 is L-shaped and made of phosphated metal (such as stainless steel). Its L-shaped bend is embedded inside the sealing ring body 3.2 to enhance overall rigidity and provide mechanical support.

[0026] The support ring 3.3 is embedded inside the sealing ring body 3.2 and is made of polyamide (PA66). It has a clearance fit (0.05-0.1mm) with the input shaft 2.1. The outer edge of the support ring 3.3 has an annular boss that matches the groove on the inner wall of the sealing ring body 3.2 to prevent axial dislodgement.

[0027] The support ring 3.3 has a height of 7mm. Increasing the shaft seal height by 7mm improves its rigidity, supporting the input shaft, suppressing radial wobble, and reducing noise caused by wobble. It also prevents external impurities from entering due to insufficient interference fit between the input shaft and the seal caused by shaft misalignment.

[0028] The sealing ring body 3.2 is made of rubber, offering excellent waterproof and airtight properties. The metal skeleton 3.1 is made of metal, with a phosphated surface treatment to bond the rubber. The support ring 3.3 is made of plastic, which is stronger than rubber, less prone to deformation, and supports the input shaft, improving steering gear rigidity. Plastic's lower strength compared to metal reduces interference forces with the input shaft while maintaining a tight seal, optimizing steering feel and lag. The sealing ring body, metal skeleton, and support ring undergo secondary vulcanization molding for enhanced product stability.

[0029] The shaft seal ring in this embodiment has stronger rigidity, which can effectively provide support and sealing, suppress input shaft wobble, and optimize bad circuit noise.

[0030] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the present invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A shaft seal ring for a steering gear, characterized in that, Includes the sealing ring body, metal skeleton, and support ring; The contact area between the sealing ring body and the input shaft includes a first lip, a second lip, and a third lip. The first lip is closest to the top of the sealing ring, and the first lip, the second lip, and the third lip are interference-fitted with the input shaft. The metal skeleton is embedded in the sealing ring body; the support ring is fixed to the inner ring of the sealing ring body and has a clearance fit with the input shaft.

2. The shaft seal ring of the steering gear according to claim 1, characterized in that, The first lip has the largest interference, and the third lip has the smallest interference.

3. The shaft seal ring of the steering gear according to claim 1, characterized in that, The outer edge of the support ring is provided with an annular boss that matches the groove on the inner wall of the sealing ring.

4. The shaft seal ring of the steering gear according to claim 1, characterized in that, The support ring is made of polyamide.

5. The shaft seal ring of the steering gear according to claim 1, characterized in that, The clearance between the support ring and the shaft is 0.05-0.1 mm.

6. The shaft seal ring of the steering gear according to claim 1, characterized in that, The height of the support ring is 7mm.

7. The shaft seal ring of the steering gear according to claim 1, characterized in that, The metal frame is L-shaped and made of phosphated metal.

8. The shaft seal ring of the steering gear according to claim 1, characterized in that, The top of the sealing ring body has a groove to reduce the rigidity of the top of the sealing ring body.

9. The shaft seal ring of the steering gear according to claim 1, characterized in that, The sealing ring body is made of rubber.

10. The shaft seal ring of the steering gear according to claim 9, characterized in that, The sealing ring body, metal skeleton, and support ring are formed by secondary vulcanization.

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