Wear sensor, wedge brake and automobile

Abstract

The utility model relates to the technical field of sensors, and provides a wear sensor, which comprises a shell and a guide rod, the guide rod partially extends out of the shell and is partially arranged in the shell, and the guide rod is driven by a driving piece to stretch out and draw back on the shell. The shell is internally provided with a connecting piece and a conducting piece which is in movable contact with the connecting piece, and the guide rod is provided with a separating piece which can separate the connecting piece from the conducting piece. The utility model further provides a wedge type brake which comprises an ejector rod seat and further comprises the abrasion sensor, the abrasion sensor is installed on the ejector rod seat, and when the ejector rod on the ejector rod seat compresses the guide rod to the initial position, the conduction piece is conducted with the connecting piece. The utility model further provides an automobile. According to the utility model, the abrasion sensor is adopted in the wedge brake to give an abrasion alarm, so that the measurement accuracy can be improved, the wedge brake can be repeatedly used, the safety is improved, and meanwhile, the monitoring cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a wear sensor, a wedge-type brake and a car. Background Art

[0002] As the most important safety equipment for modern vehicles, wedge brakes are widely used on various types of vehicles. Since the brake pads of wedge brakes are enclosed inside the wheel rims of vehicles, the thickness of the brake pads can only be visually inspected through the observation hole, and it is impossible to accurately measure and detect wear problems in time with the help of tools. If the brake pads are worn out and not replaced in time, the braking torque will drop significantly, the braking torque of the left and right wheels will be unbalanced, and serious braking problems such as long braking distance and brake deviation will occur, which will bring great hidden dangers to driving safety. Utility Model Content

[0003] The utility model aims to provide a wear sensor, a wedge-type brake and a car, which can at least solve some defects in the prior art.

[0004] To achieve the above-mentioned purpose, an embodiment of the utility model provides the following technical solution: a wear sensor, comprising a shell and a guide rod, wherein the guide rod partially extends out of the shell and partially is placed in the shell, the guide rod is driven to extend and retract on the shell by a driving member, a connecting piece and a conductive member that is in active contact with the connecting piece are provided in the shell, and an isolating member that can separate the connecting piece and the conductive member is provided on the guide rod.

[0005] Furthermore, the driving member includes a first spring sleeved on the guide rod, the first spring is arranged on the portion of the guide rod extending out of the shell, a retaining ring is provided on the guide rod, and the first spring is arranged between the retaining ring and the shell.

[0006] Furthermore, the conducting member includes a second spring, the second spring is sleeved on the guide rod, and the second spring is in movably contact with the connecting piece.

[0007] Furthermore, the isolating member includes an insulating drag piece, and the drag piece is installed on the end of the guide rod.

[0008] Furthermore, a bushing and an upper cover are provided at the opening of the shell through which the guide rod extends, the guide rod passes through the bushing, and the conducting member is located between the connecting piece and the upper cover.

[0009] Furthermore, the housing is arranged on a tailstock which can be mounted on a brake.

[0010] Furthermore, the conductive member is connected to a connector for transmitting signals to the vehicle-mounted ECU through an electric wire.

[0011] An embodiment of the utility model provides another technical solution: a wedge-type brake, including a push rod seat, and also including the above-mentioned wear sensor, wherein the wear sensor is installed on the push rod seat, and when the push rod on the push rod seat compresses the guide rod to the initial position, the conductive member is connected to the connecting piece.

[0012] Furthermore, it also includes a piston that can drive the push rod to move.

[0013] An embodiment of the utility model provides another technical solution: an automobile, comprising a brake friction pad and the above-mentioned wedge brake, wherein a gap is provided between the brake friction pad and the wedge brake, and when the gap increases, the push rod moves forward, and the guide rod moves with the push rod to extend out of the housing.

[0014] Compared with the prior art, the utility model has the beneficial effect that the wear sensor is used in the wedge brake to perform wear alarm, which can not only improve the measurement accuracy, but also can be used repeatedly, thereby improving safety and saving monitoring costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A cross-sectional schematic diagram of a wear sensor provided by an embodiment of the utility model;

[0016] Figure 2 A schematic diagram of a wedge brake provided by an embodiment of the utility model;

[0017] Figure 3 for Figure 2 Schematic cross-sectional view of ;

[0018] In the accompanying drawings: 10-wear sensor; 100-housing; 101-guide rod; 102-connecting plate; 103-first spring; 104-retaining ring; 105-second spring; 106-drag plate; 107-bushing; 108-upper cover; 109-tail stock; 110-wire; 111-connector; 112-gasket; 20-wedge brake; 200-piston; 201-thrust rod; 202-thrust rod seat. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1 , Figure 2 and Figure 3 The present utility model provides a wear sensor, including a housing 100 and a guide rod 101, wherein the guide rod 101 partially extends out of the housing 100 and partially is placed in the housing 100, and the guide rod 101 is driven by a driving member to extend and retract on the housing 100, and a connecting piece 102 and a conductive piece that is in active contact with the connecting piece 102 are provided in the housing 100, and an isolating piece that can separate the connecting piece 102 and the conductive piece is provided on the guide rod 101. In this embodiment, the guide rod 101 is extended and retracted in the housing 100 under the driving of the driving member. In the initial state, the conductive piece is in contact with the connecting piece 102, and the connecting piece 102 transmits the signal through the wire 110, thus forming a complete circuit. When the guide rod 101 extends, it drives the isolating piece to move together, and the isolating piece will continue to move with the isolating piece after it abuts against the conductive piece, until the isolating piece is no longer in contact with the connecting piece 102, at which time the circuit is disconnected, and the sensor no longer transmits a signal, realizing a short circuit alarm. Figure 1 The arrows represent the directions in which the guide rod 101 is extended and retracted.

[0021] As an optimization solution of the embodiment of the utility model, please refer to Figure 1 , Figure 2 and Figure 3 , the driving member includes a first spring 103 sleeved on the guide rod 101, the first spring 103 is arranged on the part of the guide rod 101 extending from the housing 100, a retaining ring 104 is arranged on the guide rod 101, and the first spring 103 is arranged between the retaining ring 104 and the housing 100. In this embodiment, the above-mentioned driving member is refined, and it can be driven by a spring. In the initial state, the guide rod 101 is compressed. As wear occurs, the force of the guide rod 101 being compressed will become smaller and smaller, and the guide rod 101 will move forward under the elastic action of the first spring 103, thereby realizing the telescopic action. The first spring 103 is pressed on the housing 100 by the retaining ring 104, so it has the ability to reset. Preferably, a gasket 112 is arranged on the side of the retaining ring 104 facing the first spring 103 to ensure the stability of the first spring 103.

[0022] As an optimization solution of the embodiment of the utility model, please refer to Figure 1 , Figure 2 and Figure 3 , the conductive member includes a second spring 105, the second spring 105 is sleeved on the guide rod 101, and the second spring 105 is in active contact with the connecting piece 102. In this embodiment, the conductive member is a spring, which has the characteristic of being compressed, so it can be compressed to leave the connecting piece 102 under the action of the isolation member, that is, the circuit is disconnected. When designing the second spring 105, its outer wall needs to be able to contact the connecting piece 102, and then it also needs to be able to be stably pushed by the isolation member.

[0023] As an optimization solution of the embodiment of the utility model, please refer to Figure 1 , Figure 2 and Figure 3 The isolating member includes an insulating drag sheet 106, and the drag sheet 106 is installed at the end of the guide rod 101. In this embodiment, the isolating member is refined, which can be a drag sheet 106, which can be formed by injection molding. The end of the drag sheet 106 can be made of plastic, and moves with the guide rod 101 to squeeze the second spring 105.

[0024] As an optimization solution of the embodiment of the utility model, please refer to Figure 1 , Figure 2 and Figure 3 The housing 100 is provided with a bushing 107 and an upper cover 108 at the opening through which the guide rod 101 extends. The guide rod 101 passes through the bushing 107, and the conductive member is located between the connecting piece 102 and the upper cover 108. In this embodiment, an opening is provided at the upper portion of the housing 100 to facilitate the extension of the guide rod 101, and a bushing 107 is designed at the opening to facilitate the extension and retraction of the guide rod 101. The upper cover 108 can block the bushing 107 and the portion outside the guide rod 101.

[0025] As an optimization solution of the embodiment of the utility model, please refer to Figure 1 , Figure 2 and Figure 3 The housing 100 is disposed on a tailstock 109 that can be mounted on a brake. In this embodiment, the wear sensor 10 has a tailstock 109 for mounting the housing 100, and the tailstock 109 can be mounted on a wedge-type brake, so that the wear sensor 10 is mounted on the wedge-type brake.

[0026] As an optimization solution of the embodiment of the utility model, please refer to Figure 1 , Figure 2 and Figure 3 The conductive member is connected to a connector 111 for transmitting a signal to the vehicle-mounted ECU via a wire 110. In this embodiment, the signal of the wear sensor 10 can be transmitted to the connector 111 via the wire 110, and then sent to the vehicle-mounted ECU via the connector 111, and the warning light in the cab lights up, prompting the driver to replace the friction plate.

[0027] See also Figure 1 , Figure 2 and Figure 3The embodiment of the utility model provides a wedge brake, including a push rod seat and the above-mentioned wear sensor 10, wherein the wear sensor 10 is installed on the push rod seat, and when the push rod 201 on the push rod seat 202 compresses the guide rod 101 to the initial position, the conductive member is connected to the connecting piece 102. In this embodiment, the above-mentioned wear sensor 10 is used on the wedge brake, and the guide rod 101 is extended and retracted in the housing 100 under the drive of the driving member. In the initial state, the conductive member is in contact with the connecting piece 102 for conduction, and the connecting piece 102 then transmits the signal through the wire 110, thus forming a complete circuit. When the guide rod 101 is extended, it drives the isolating member to move together, and the isolating member will continue to move with the isolating member after abutting against the conductive member until the isolating member is no longer in contact with the connecting piece 102, at which time the circuit is disconnected, and the sensor no longer transmits a signal, realizing a short circuit alarm. Preferably, the wedge brake also includes a piston 200 that can drive the displacement of the push rod. When the product is mounted on the wedge brake, the guide rod 101 is pushed to the bottom of the tailstock 109. The product is in the conducting state. When the friction plate is worn out, the guide rod 101 moves upward. The drag piece 106 on the guide rod 101 moves to the second spring. Under the pulling force of the first spring, the drag piece 106 of the guide rod 101 compresses the second spring. The second spring is separated from the connecting piece 102. A circuit breaker alarm is realized.

[0028] See also Figure 1 , Figure 2 and Figure 3 An embodiment of the utility model provides a car, including a brake friction pad and the above-mentioned wedge brake 20, wherein there is a gap between the brake friction pad and the wedge brake 20. When the gap increases, the push rod 201 moves forward, and the guide rod 101 moves with the push rod 201 to extend out of the housing 100. In this embodiment, the wear sensor 10 is mounted on the push rod seat 202. Then the push rod 201 is rotated to the initial position. The guide rod 101 of the wear sensor 10 is pushed to the bottom (i.e., the initial position) under the compression of the push rod 201. The second spring 105 of the wear sensor 10 is turned on. When the brake friction pad is worn, the piston rotates, driving the push rod 201 to move outward. Under the return elastic force of the first spring 103, the guide rod 101 of the wear sensor moves outward following the push rod. When the brake friction pad is worn out. As Figure 3 As shown by the arrow, when the push rod 201 moves outward to the design value under the rotation of the piston 200, the friction sensor guide rod 101 is pulled onto the second spring 105 under the return elastic force of the first spring 103, and the dragging piece 106 on the guide rod 101 pulls the second spring 105 apart. The second spring 105 is separated from the connecting piece 102. The warning light in the cab lights up, prompting the driver to replace the friction plate.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wear sensor, comprising a housing and a guide rod, characterized in that: The guide rod partially extends out of the shell and is partially placed in the shell. The guide rod is driven to extend and retract on the shell by a driving member. A connecting piece and a conductive member that is in active contact with the connecting piece are provided in the shell. An isolating member that can separate the connecting piece and the conductive member is provided on the guide rod.

2. The wear sensor according to claim 1, characterized in that: The driving member comprises a first spring sleeved on the guide rod, the first spring is arranged on the portion of the guide rod extending out of the shell, a retaining ring is arranged on the guide rod, and the first spring is arranged between the retaining ring and the shell.

3. The wear sensor according to claim 1, characterized in that: The conducting member comprises a second spring, the second spring is sleeved on the guide rod, and the second spring is in active contact with the connecting piece.

4. The wear sensor according to claim 1, characterized in that: The isolating member comprises an insulating drag piece, and the drag piece is mounted on the end of the guide rod.

5. The wear sensor according to claim 1, characterized in that: A bushing and an upper cover are provided at the opening of the shell through which the guide rod extends, the guide rod passes through the bushing, and the conducting member is located between the connecting piece and the upper cover.

6. The wear sensor according to claim 1, characterized in that: The housing is arranged on a tailstock which can be mounted on a brake.

7. The wear sensor according to claim 1, characterized in that: The conductive piece is connected to a connector for transmitting a signal to an on-vehicle ECU via an electric wire.

8. A wedge brake, comprising a push rod seat, characterized in that: It also includes a wear sensor as described in any one of claims 1-7, wherein the wear sensor is installed on the push rod seat, and when the push rod on the push rod seat compresses the guide rod to an initial position, the conductive member is connected to the connecting piece.

9. The wedge brake according to claim 8, characterized in that: It also includes a piston which can drive the push rod to move.

10. An automobile, comprising a brake friction pad, characterized in that: It also includes a wedge brake as described in claim 8 or 9, wherein a gap is provided between the brake friction pad and the wedge brake, and when the gap increases, the push rod moves forward, and the guide rod moves with the push rod to extend out of the housing.

Images