Anti-backseal wheel speed sensor
By designing non-overlapping positioning pins and sealing rings on the inner frame of the wheel speed sensor, the problems of reverse placement and poor sealing during injection molding were solved, resulting in a wheel speed sensor with high accuracy and reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- TSINGHUA UNIVERSITY
- Filing Date
- 2026-02-04
- Publication Date
- 2026-06-19
AI Technical Summary
Existing wheel speed sensors are prone to being placed upside down during injection molding, causing the detection signal to deviate. Furthermore, they have poor sealing performance in high temperature and high humidity environments, affecting the accuracy and reliability of the detection.
The design incorporates positioning posts on the inner frame, including a first positioning post and a second positioning post, whose projections parallel to the surface do not coincide. A sealing ring is provided on the outer circumferential surface. The injection-molded shell and the sealing ring form a complex sealing structure to prevent reverse placement and improve sealing performance.
It effectively prevents reverse placement during injection molding, improves the accuracy and reliability of detection signals, ensures sealing, avoids air and water ingress, and enhances the sensor's anti-reverse function.
Smart Images
Figure CN122238656A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of vehicle engineering technology, and more specifically, to a wheel speed sensor with anti-reverse sealing. Background Technology
[0002] The production process of wheel speed sensors involves placing the inner frame in a mold and forming the outer shell through injection molding.
[0003] In related technologies, wheel speed sensors are prone to being installed backwards during injection molding, causing the inner skeleton to be reversed after injection molding, resulting in a deviation in the detection signal and affecting the accuracy of the detection. Some wheel speed sensors have a certain anti-reverse function by adjusting the shape of the positioning posts on both sides, but in actual operation, they can still be installed backwards.
[0004] In addition, in the wheel speed sensor of the related technology, the injection-molded shell is prone to poor integration with the inner skeleton in areas where the thickness is relatively thin. This can lead to sealing problems in high temperature and high humidity environments, causing air and water to enter the wheel speed sensor and affecting the accuracy of the detection signal. Summary of the Invention
[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a wheel speed sensor with anti-reverse sealing, which has the advantages of preventing reverse placement during injection molding, good sealing performance, high accuracy, and high reliability.
[0006] To achieve the above objectives, an anti-reverse sealing wheel speed sensor is proposed according to an embodiment of the present invention. The anti-reverse sealing wheel speed sensor includes: an inner frame, on which positioning posts are provided, the positioning posts including a first positioning post and a second positioning post, the first positioning post and the second positioning post being located on two opposite surfaces of the inner frame respectively, the projections of the first positioning post and the second positioning post in a plane parallel to their respective surfaces not coinciding, and a sealing ring being provided on the outer peripheral surface of each positioning post; and an injection-molded outer shell, the injection-molded outer shell being disposed outside the inner frame.
[0007] The anti-reverse sealing wheel speed sensor according to an embodiment of the present invention has the advantages of preventing reverse placement during injection molding, good sealing performance, high accuracy, and strong reliability.
[0008] In addition, the anti-reverse sealing wheel speed sensor according to the above embodiments of the present invention may also have the following additional technical features: According to one embodiment of the present invention, there are two first positioning posts spaced apart along the length direction of the inner frame, and there are two second positioning posts spaced apart along the length direction of the inner frame.
[0009] According to one embodiment of the present invention, two second positioning posts are located between two first positioning posts in the length direction of the inner frame.
[0010] According to one embodiment of the present invention, each of the positioning posts has a plurality of sealing rings spaced apart along the axial direction on its outer peripheral surface and a sealing groove is formed between two adjacent sealing rings.
[0011] According to one embodiment of the present invention, the sealing ring is spaced apart from the end face of the positioning post.
[0012] According to one embodiment of the present invention, a groove is formed on the end face of each of the positioning posts.
[0013] According to one embodiment of the present invention, the cross-section of the first positioning post perpendicular to the axial direction and the cross-section of the second positioning post perpendicular to the axial direction have different shapes.
[0014] According to one embodiment of the present invention, the first positioning post has a circular cross-section perpendicular to the axial direction, and the second positioning post has an elliptical cross-section perpendicular to the axial direction.
[0015] According to one embodiment of the present invention, the surfaces where the first positioning post is located and the surfaces where the second positioning post is located are both parallel to the length direction of the inner skeleton.
[0016] According to one embodiment of the present invention, the sealing ring is integrally formed with the positioning post.
[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the internal skeleton of the anti-reverse sealing wheel speed sensor according to an embodiment of the present invention.
[0019] Figure 2 This is a schematic diagram of the internal skeleton of the anti-reverse sealing wheel speed sensor according to an embodiment of the present invention.
[0020] Figure 3 yes Figure 2 Enlarged view of point A in the middle.
[0021] Figure 4 This is a schematic diagram of the internal skeleton of the anti-reverse sealing wheel speed sensor according to an embodiment of the present invention.
[0022] Figure 5 yes Figure 4 Enlarged view of point B in the middle.
[0023] Reference numerals in the attached drawings: wheel speed sensor 1 for anti-reverse sealing, inner frame 10, first positioning post 11, second positioning post 12, sealing ring 13, sealing groove 14, groove 15. Detailed Implementation
[0024] This invention is based on the discovery of the following facts and problems: In related technologies, wheel speed sensors are prone to being installed backwards during injection molding, causing the inner skeleton to be reversed after injection molding, resulting in a deviation in the detection signal and affecting the accuracy of the detection. Some wheel speed sensors have a certain anti-reverse function by adjusting the shape of the positioning posts on both sides, but in actual operation, they can still be installed backwards.
[0025] Specifically, some wheel speed sensors in related technologies achieve a certain anti-reverse function by slightly misaligning the positioning posts on both sides, making them not completely aligned. However, in actual operation, the wheels can still be placed backwards.
[0026] In addition, in the wheel speed sensor of the related technology, the injection-molded shell is prone to poor integration with the inner skeleton in areas where the thickness is relatively thin. This can lead to sealing problems in high temperature and high humidity environments, causing air and water to enter the wheel speed sensor and affecting the accuracy of the detection signal.
[0027] Specifically, because the injection-molded shell at the positioning post is relatively thin, it is more prone to sealing problems.
[0028] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0030] The anti-reverse sealing wheel speed sensor 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings.
[0031] like Figures 1-5 As shown, the anti-reverse sealing wheel speed sensor 1 according to an embodiment of the present invention includes an inner frame 10 and an injection-molded housing.
[0032] The inner frame 10 is provided with positioning posts, including a first positioning post 11 and a second positioning post 12. The first positioning post 11 and the second positioning post 12 are respectively located on two opposite surfaces of the inner frame 10. The projections of the first positioning post 11 and the second positioning post 12 in a plane parallel to their respective surfaces do not coincide. A sealing ring 13 is provided on the outer peripheral surface of each positioning post. In other words, the projections of the first positioning post 11 and the second positioning post 12 in a plane parallel to their respective surfaces are completely offset.
[0033] The injection-molded outer shell is located outside the inner frame 10.
[0034] Specifically, during the injection molding process, the inner skeleton 10 is placed in the mold. If it is reversed, the positioning ejector pin will not be able to cooperate smoothly with the positioning post, causing the injection molding process to stop. The inner skeleton 10 needs to be readjusted to the correct placement direction to prevent the inner skeleton 10 from being reversed with the injection molded shell after injection molding, thus playing an anti-reverse function.
[0035] According to an embodiment of the present invention, the anti-reverse sealing wheel speed sensor 1, by ensuring that the projections of the first positioning post 11 and the second positioning post 12 in a plane parallel to their respective surfaces do not coincide, prevents the positioning pins from engaging smoothly with the positioning posts if the inner skeleton 10 is placed in reverse during injection molding, thus halting the injection molding process. The inner skeleton 10 must then be readjusted to the correct orientation, preventing the inner skeleton 10 from being reversed from the injection-molded outer shell after injection molding. This provides an anti-reverse function, ensuring the correct position of the inner skeleton 10 and improving the detection accuracy and reliability of the anti-reverse sealing wheel speed sensor 1.
[0036] Furthermore, by ensuring that the projections of the first positioning post 11 and the second positioning post 12 in a plane parallel to their respective surfaces do not overlap, the first positioning post 11 and the second positioning post 12 can be completely offset. Compared to the positioning posts in related technologies that are only slightly misaligned, this can prevent the ejector pin and the positioning post from cooperating smoothly after the inner skeleton 10 is placed in the reverse direction, thus preventing the injection molding process from continuing. This effectively avoids the inner skeleton 10 being placed in the reverse direction, effectively providing an anti-reverse function, ensuring the correct position of the inner skeleton 10, and improving the detection accuracy and reliability of the anti-reverse sealing wheel speed sensor 1.
[0037] Furthermore, by setting a sealing ring 13 on the positioning post, a complex mating structure can be formed between the sealing ring 13 and the injection molded shell after injection molding. Even if the injection molded shell at the positioning post is relatively thin and the fit with the inner skeleton 10 is poor, the sealing function can still be achieved through the mating of the sealing ring 13 and the injection molded shell to prevent water and air from entering, thereby further improving the accuracy and reliability of the anti-reverse sealing wheel speed sensor 1.
[0038] Therefore, the anti-reverse sealing wheel speed sensor 1 according to the present invention has the advantages of being able to prevent reverse placement during injection molding, having good sealing performance, high accuracy, and strong reliability.
[0039] The anti-reverse sealing wheel speed sensor 1 according to a specific embodiment of the present invention is described below with reference to the accompanying drawings.
[0040] In some specific embodiments of the present invention, such as Figures 1-5 As shown, the anti-reverse sealing wheel speed sensor 1 according to an embodiment of the present invention includes an inner frame 10 and an injection-molded housing.
[0041] Specifically, such as Figure 1 , Figure 2 and Figure 4As shown, there are two first positioning posts 11 spaced apart along the length of the inner frame 10, and two second positioning posts 12 spaced apart along the length of the inner frame 10. This not only allows the two first positioning posts 11 and the two second positioning posts 12 to provide positioning during and after injection molding, improving the positioning effect, but also allows them to work together to prevent reverse rotation, further enhancing the anti-reverse effect.
[0042] Advantageously, such as Figure 1 , Figure 2 and Figure 4 As shown, the two second positioning posts 12 are located between the two first positioning posts 11 along the length of the inner skeleton 10. This makes the two first positioning posts 11 and the two second positioning posts 12 completely asymmetrical in position, enhancing the visual and tactile difference between the positioning posts on both sides of the inner skeleton 10, allowing operators or equipment to more intuitively and effectively determine whether the inner skeleton 10 is reversed, and further preventing reverse placement during injection molding.
[0043] Figures 1-5 A wheel speed sensor 1 with anti-reverse sealing according to some examples of the present invention is shown. For example... Figures 1-5 As shown, each of the positioning posts has multiple axially spaced sealing rings 13 on its outer circumferential surface, and a sealing groove 14 is formed between two adjacent sealing rings 13. In this way, after injection molding, the injection-molded shell fills the sealing groove 14, forming a multi-layered and complex sealing structure with the adjacent sealing rings 13, thereby further improving the sealing performance of the anti-reverse sealing wheel speed sensor 1.
[0044] Advantageously, such as Figures 1-5 As shown, the sealing ring 13 is spaced apart from the end face of the positioning post. After injection molding, the injection-molded housing fills the space between the end face of the positioning post and the sealing ring 13, further forming a complex sealing structure and further improving the sealing performance of the anti-reverse sealing wheel speed sensor 1.
[0045] Specifically, such as Figures 2-5 As shown, each of the positioning posts has a groove 15 formed on its end face. This facilitates the engagement of the positioning post with the positioning ejector pin during the injection molding process, which not only facilitates the positioning of the inner skeleton 10, but also further prevents the inner skeleton 10 from being placed in reverse.
[0046] More advantageously, such as Figure 3 and Figure 5 As shown, the cross-section of the first positioning post 11 perpendicular to the axial direction and the cross-section of the second positioning post 12 perpendicular to the axial direction have different shapes. This allows the first positioning post 11 and the second positioning post 12 to be distinguished by their different shapes, further serving as a countermeasure against reversal.
[0047] Optionally, such as Figure 3 and Figure 5 As shown, the first positioning post 11 has a circular cross-section perpendicular to the axial direction, while the second positioning post 12 has an elliptical cross-section perpendicular to the axial direction. This facilitates the differentiation between the first positioning post 11 and the second positioning post 12, further enhancing the anti-reverse function.
[0048] More specifically, such as Figures 1-5 As shown, the surfaces where the first positioning post 11 and the second positioning post 12 are located are both parallel to the length direction of the inner frame 10. This makes it easier to distinguish between two relatively similar surfaces of the inner frame 10, thereby further facilitating the reverse placement of the inner frame 10.
[0049] Furthermore, the sealing ring 13 is integrally formed with the positioning post. This simplifies the assembly process, reduces the number of parts, and improves production efficiency.
[0050] Specifically, such as Figure 1 As shown, the thickness of each sealing ring 13 gradually decreases radially from the inside to the outside. This facilitates the filling of the injection-molded shell between the sealing rings 13 during the injection molding process, thereby further improving the sealing effect.
[0051] Other configurations and operations of the anti-reverse sealing wheel speed sensor 1 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.
[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms 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.
[0053] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A wheel speed sensor with anti-reverse sealing, characterized in that, include: An inner frame is provided with positioning posts, including a first positioning post and a second positioning post. The first positioning post and the second positioning post are respectively located on two opposite surfaces of the inner frame. The projections of the first positioning post and the second positioning post in a plane parallel to their respective surfaces do not coincide. Each positioning post has a sealing ring on its outer peripheral surface. The injection-molded housing is disposed outside the inner frame.
2. The anti-reverse sealing wheel speed sensor according to claim 1, characterized in that, The first positioning post consists of two posts spaced apart along the length of the inner frame, and the second positioning post consists of two posts spaced apart along the length of the inner frame.
3. The anti-reverse sealing wheel speed sensor according to claim 2, characterized in that, The two second positioning posts are located between the two first positioning posts along the length of the inner frame.
4. The anti-reverse sealing wheel speed sensor according to claim 1, characterized in that, Each of the positioning posts has a plurality of sealing rings spaced apart along the axial direction on its outer peripheral surface, and a sealing groove is formed between two adjacent sealing rings.
5. The anti-reverse sealing wheel speed sensor according to claim 1, characterized in that, The sealing ring is spaced apart from the end face of the positioning post.
6. The anti-reverse sealing wheel speed sensor according to claim 1, characterized in that, Each of the positioning posts has a groove formed on its end face.
7. The anti-reverse sealing wheel speed sensor according to claim 1, characterized in that, The cross-section of the first positioning post perpendicular to the axial direction has a different shape than the cross-section of the second positioning post perpendicular to the axial direction.
8. The anti-reverse sealing wheel speed sensor according to claim 1, characterized in that, The first positioning post has a circular cross-section perpendicular to the axial direction, and the second positioning post has an elliptical cross-section perpendicular to the axial direction.
9. The anti-reverse sealing wheel speed sensor according to claim 1, characterized in that, The surfaces where the first positioning post and the second positioning post are located are both parallel to the length direction of the inner skeleton.
10. The anti-reverse sealing wheel speed sensor according to claim 1, characterized in that, The sealing ring is integrally formed with the positioning post.