Brake system motor position sensor

Abstract

The utility model relates to a brake system motor position sensor which comprises a sensor body and a guide column, the guide column is arranged on the sensor body in an injection molding mode, and a signal pin of the sensor body is located in the guide column. A protruding point, a guide piece and a sealing ring are sequentially arranged on the guide column from the end away from the sensor body to the end close to the sensor body, the protruding point is in transition fit with an ECU hole, the guide piece is in clearance fit with a valve body through hole, the sealing ring is in interference fit with the valve body through hole, and a circle of concentric positioning plate is arranged on the sensor body. The motor position sensor has the advantages that the salient point, the guide sheet and the sealing ring are arranged on the guide post, and the motor position sensor is well matched with the valve body and the ECU through the transition fit between the salient point and the ECU, the clearance fit between the guide structure and the through hole of the valve body and the interference fit between the sealing ring and the through hole of the valve body; and the performance failure of the one box system in electrical cooperation caused by the assembly problem and the durability problem of the motor position sensor is avoided.

Description

Technical Field

[0001] This utility model relates to the field of position sensor technology, and in particular to a position sensor for a brake system motor. Background Technology

[0002] With the widespread application of new energy vehicles, more and more new energy vehicles have abandoned the original vacuum braking system design and adopted a one-box system for brake assist design. However, with the adoption of the one-box system, there is a long valve body structure between the motor angle vanes and the ECU. Therefore, how to achieve the cooperation between the motor position sensor and the long valve body is particularly critical. Some motor position sensors use wire harnesses and standard connectors to pass through the thick valve body to transmit signals between the motor angle vanes and the ECU. However, this solution has the disadvantages of high manufacturing cost and complex process. On the other hand, the direct injection molding solution often leads to poor contact of the motor position sensor signal terminal due to positioning and perpendicularity issues. Summary of the Invention

[0003] This utility model mainly solves the above-mentioned problems and provides a motor position sensor for a brake system. By setting protrusions, a guide structure and a sealing ring on the guide post, the guide post and the valve body through hole are made concentric, ensuring good contact between the sensor information pin and the ECU.

[0004] The technical solution adopted by this utility model to solve its technical problem is a brake system motor position sensor, including a sensor body and a guide post. The guide post is injection molded on the sensor body, and the signal pin of the sensor body is located in the guide post. The guide post is provided with a protrusion, a guide plate and a sealing ring in sequence from the end away from the sensor body to the end close to the sensor body. The protrusion is transitionally fitted with the ECU hole, the guide plate is clearance fitted with the valve body through hole, and the sealing ring is interference fitted with the valve body through hole. A concentric positioning plate is provided on the sensor body.

[0005] As a preferred embodiment of the above solution, the protrusions are evenly distributed in a ring on the end of the guide post away from the sensor body, and the diameter of the circle formed by the outer side of each protrusion is larger than the diameter of the ECU hole.

[0006] As a preferred embodiment of the above solution, the guide plates are evenly distributed in a ring shape in the middle section of the guide post, and the diameter of the circle formed on the outer side of each guide plate is less than or equal to the diameter of the valve body through hole.

[0007] As a preferred embodiment of the above solution, the guide plate is arranged along the axial direction of the guide post.

[0008] As a preferred embodiment of the above solution, the guide post is provided with an annular groove near the end of the sensor body, and the sealing ring is disposed in the annular groove, wherein the outer diameter of the sealing ring is larger than the diameter of the valve body through hole.

[0009] As a preferred embodiment of the above solution, the signal pins of the sensor body are divided into two groups located on the first and second sides opposite to the guide post, respectively. Several weight-reducing cutouts are provided between the first and second sides of the guide post, and horizontally extending arc-shaped reinforcing plates are provided on the first and second sides of the guide post.

[0010] As a preferred embodiment of the above solution, the concentric positioning plates are evenly distributed in a ring on the sensor body, and the side of the concentric positioning plates is provided with positioning protrusions.

[0011] As a preferred embodiment of the above solution, the concentric positioning plate is provided with crushing points.

[0012] As a preferred embodiment of the above solution, the sensor body is provided with an angle positioning post.

[0013] The advantages of this utility model are: the guide post is provided with protrusions, guide plates and sealing rings. Through the over-fitting of the protrusions with the ECU, the clearance fit between the guide structure and the valve body through hole and the interference fit between the sealing ring and the valve body through hole, a good fit between the motor position sensor and the valve body and the ECU is achieved, avoiding the performance failure of electrical fit caused by assembly problems and durability problems of the motor position sensor in the one box system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the motor position sensor in the braking system.

[0015] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle.

[0016] Figure 3 for Figure 1 A magnified view of a portion of region B in the middle.

[0017] Figure 4 for Figure 1 A magnified view of a portion of region C.

[0018] Figure 5 This is a schematic diagram showing the distribution of signal pins in the guide post.

[0019] 1-Sensor body 2-Guide post 3-Concentric positioning plate 4-Angle positioning post 5-Sealing ring 6-Arc reinforcing plate 7-Weight reduction hollow 8-Protrusion 9-Guide plate 10-Positioning protrusion 11-Crush point 12-Signal pin Detailed Implementation

[0020] The technical solution of this utility model will be further described below through embodiments and in conjunction with the accompanying drawings.

[0021] Example:

[0022] This embodiment describes a motor position sensor for a braking system, used in a one-box system, such as... Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the sensor includes a sensor body 1 and a guide post 2. The sensor body 1 is provided with an angle positioning post 4 and a concentric positioning plate 3. The concentric positioning plate 3 is evenly distributed in a ring on the sensor body 1. The guide post 2 is injection molded onto the sensor body 1. The signal pins 11 of the sensor body 1 are located in the guide post 2. The signal pins 11 of the sensor body are divided into two groups and located on the first and second sides of the guide post 2 respectively. Several weight-reducing cutouts 7 are provided between the first and second sides of the guide post 2. The first and second sides of the guide post are provided with horizontally extending arc-shaped reinforcing plates 6.

[0023] The guide post 2 is provided with protrusions 8, guide plates 9, and sealing rings 5 ​​sequentially from the end furthest from the sensor body to the end closest to the sensor body. The protrusions 8 are in transition fit with the ECU hole, and are evenly distributed in a ring on the end of the guide post 2 furthest from the sensor body 1. The diameter of the circle formed by the outer sides of each protrusion 8 is larger than the diameter of the ECU hole. The guide plates 9 are in clearance fit with the valve body through hole, and are evenly distributed in a ring in the middle section of the guide post 2. The guide plates 9 are axially arranged along the guide post 2, and the diameter of the circle formed by the outer sides of each guide plate 9 is less than or equal to the diameter of the valve body through hole. The sealing ring 5 is in interference fit with the valve body through hole. The end of the guide post 2 closest to the sensor body 1 has an annular groove, and the sealing ring 5 is disposed in the annular groove. The outer diameter of the sealing ring 5 is larger than the diameter of the valve body through hole. In this embodiment, there are four protrusions 8 spaced 90° apart, and three guide plates 9 spaced 120° apart. When the guide post 2 passes through the valve body through hole and connects to the ECU hole, the protrusion 8 at the far end of the guide post in the ECU hole will rub against the ECU hole wall, causing the protrusion 8 to wear. This wear ensures the protrusion 8 is properly fitted to the ECU hole. The guide plate performs initial centering after the guide post enters the valve body and guides the protrusion into the ECU hole. It also assists in centering after assembly, preventing sensor and ECU failure after long-term durability. The sealing ring centers the guide post and reduces excessive wear on the protrusion and guide plate, ensuring long-term product stability during use.

[0024] like Figure 4As shown, the concentric positioning plate 3 has a positioning protrusion 10 on its side. The positioning protrusion 10 is used to ensure the accuracy of the sensor body's installation position, while the angle positioning post 4 is used to ensure the accuracy of the sensor body's installation angle. In addition, a crushing point 11 is provided on the concentric positioning plate. When installing the sensor body, the crushing point 11 contacts the valve body. A fixing component is also required on the other side of the sensor body. When installing the fixing component, the fixing component presses the sensor body against the valve body, and the crushing point breaks due to the force. This ensures that the sensor body can be stably set between the fixing component and the valve body without gaps that would cause the sensor body to shake.

[0025] In this embodiment, the brake system motor position sensor features a protrusion, guide plate, and sealing ring on its guide post. Through the over-fitting of the protrusion with the ECU, the clearance fit between the guide structure and the valve body through-hole, and the interference fit between the sealing ring and the valve body through-hole, a good fit is achieved between the motor position sensor, the valve body, and the ECU. This prevents performance failures in the one-box system due to assembly or durability issues with the motor position sensor. Furthermore, by providing crushing points on the concentric positioning plate of the sensor body, vibration of the sensor body after installation is prevented.

[0026] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A motor position sensor for a braking system, characterized in that: The sensor includes a sensor body and a guide post. The guide post is injection molded onto the sensor body. The signal pins of the sensor body are located in the guide post. The guide post has a protrusion, a guide plate, and a sealing ring arranged sequentially from the end away from the sensor body to the end near the sensor body. The protrusion is transitionally fitted with the ECU hole. The guide plate is clearance fitted with the valve body through hole. The sealing ring is interference fitted with the valve body through hole. The sensor body is provided with a concentric positioning plate.

2. The brake system motor position sensor according to claim 1, characterized in that: The protrusions are evenly distributed in a ring on the end of the guide post away from the sensor body, and the diameter of the circle formed by the outer side of each protrusion is larger than the diameter of the ECU hole.

3. The brake system motor position sensor according to claim 1, characterized in that: The guide plates are evenly distributed in a ring in the middle section of the guide post, and the diameter of the circle formed on the outer side of each guide plate is less than or equal to the diameter of the valve body through hole.

4. The brake system motor position sensor according to claim 3, characterized in that: The guide plate is arranged along the axial direction of the guide post.

5. The brake system motor position sensor according to claim 1, characterized in that: The guide post has an annular groove near the sensor body, and the sealing ring is set in the annular groove. The outer diameter of the sealing ring is larger than the diameter of the valve body through hole.

6. The brake system motor position sensor according to claim 1, characterized in that: The signal pins of the sensor body are divided into two groups located on the first and second sides opposite to the guide post. Several weight-reducing cutouts are provided between the first and second sides of the guide post, and horizontally extending arc-shaped reinforcing plates are provided on the first and second sides of the guide post.

7. The brake system motor position sensor according to claim 1, characterized in that: The concentric positioning plates are evenly distributed in a ring on the sensor body, and positioning protrusions are provided on the side of the concentric positioning plates.

8. The brake system motor position sensor according to claim 1 or 7, characterized in that: The concentric positioning plate is provided with crushing points.

9. The brake system motor position sensor according to claim 1, characterized in that: The sensor body is equipped with an angle positioning post.

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