Passive wheel speed sensor

Abstract

The utility model discloses a passive wheel speed sensor, which comprises a shell and a signal detection head detachably arranged on the shell, the signal detection head is integrally formed by injection molding, a group of external assembly holes matched with the shell are arranged on the signal detection head, and an electromagnetic integrated block is integrally formed in the signal detection head by injection molding. The electromagnetic integrated block comprises a circuit integrated block, square magnetic steel and annular magnetic steel, the circuit integrated block comprises a framework assembly, the framework assembly comprises a framework shell and a connecting piece, and an annular magnetic steel positioning support matched with the annular magnetic steel is arranged on the side wall of the inner ring of the framework shell. A square magnetic steel positioning support matched with the square magnetic steel is arranged on the side wall of the inner ring of the framework shell and located below the annular magnetic steel positioning support. The passive wheel speed sensor solves the problems that the structural design of the framework assembly shell is not reasonable enough, the magnetic steel is difficult to assemble, and the quality is influenced due to the fact that the position is easy to deviate in the existing passive wheel speed sensor.

Description

Technical Field

[0001] The utility model relates to the field of wheel speed sensor processing, in particular to a passive wheel speed sensor. Background Art

[0002] Because the skeleton assembly shell part of the existing passive wheel speed sensor does not have a positioning structure that is compatible with the square magnet and the annular magnet, the positional relationship between the square magnet and the annular magnet is prone to offset and eccentricity during assembly. The concentricity of the square magnet and the annular magnet relative to the magnetic conductor is prone to deviation, making manual assembly difficult. Utility Model Content

[0003] The utility model aims to provide a passive wheel speed sensor to solve the problems of existing passive wheel speed sensors, such as unreasonable design of the frame assembly shell structure, difficulty in assembling the magnetic steel, and easy position deviation affecting the quality.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a passive wheel speed sensor, including a shell and a signal detection head detachably mounted on the shell, the signal detection head is integrally injection-molded, and is provided with a group of external assembly holes adapted to the shell, an electromagnetic integrated block is integrally injection-molded inside the signal detection head, the electromagnetic integrated block includes a circuit integrated block, a square magnetic steel, and an annular magnetic steel, the circuit integrated block includes a skeleton assembly, the skeleton assembly includes a skeleton shell and a connecting piece, an annular magnetic steel positioning bracket adapted to the annular magnetic steel is provided on the inner ring side wall of the skeleton shell, and a square magnetic steel positioning bracket adapted to the square magnetic steel is provided on the inner ring side wall of the skeleton shell below the annular magnetic steel positioning bracket.

[0005] In order to provide a magnetic steel positioning structure and improve the ease of assembly, the annular magnetic steel positioning bracket includes six positioning blocks integrally injection-molded on the inner ring side wall of the skeleton shell, the six positioning blocks are arranged at intervals around the inner ring side wall of the skeleton shell, and the six positioning blocks include three high positioning blocks and three low positioning blocks; the low positioning blocks are respectively arranged between two high positioning blocks; the upper end plane of the low positioning block is a horizontal positioning table surface that is compatible with the bottom end surface of the annular magnetic steel; the upper end planes of the high positioning block and the low positioning block are provided with placement steps that are compatible with the annular magnetic steel at the same position; the annular magnetic steel is mounted on the placement steps and the horizontal positioning table surface; the outer side wall of the low positioning block away from the inner ring side wall of the skeleton shell is a magnetic steel positioning surface that is compatible with the square magnetic steel; the outer side wall of the high positioning block located below the placement step is a magnetic steel positioning surface that is compatible with the square magnetic steel; the magnetic steel positioning surfaces of each high positioning block and the low positioning block constitute a magnetic steel positioning area that is compatible with the outer side wall of the square magnetic steel, and each magnetic steel positioning surface is connected to the corresponding outer side wall of the square magnetic steel.

[0006] In order to facilitate assembly, the top of the outer wall of the high positioning block away from the inner circle of the skeleton shell and the top of each magnetic steel positioning surface are chamfered.

[0007] In order to avoid manual installation of the connecting piece and eliminate the need to provide a connecting piece installation slot on the skeleton shell, thereby improving the overall structural stability, the skeleton assembly is integrally injection-molded with the magnetic conductor and the connecting piece.

[0008] The beneficial effects of the utility model are as follows: the signal detection head is integrally formed by injection molding, and has higher air tightness, stable structure and performance stability. The arrangement of the square magnetic steel positioning bracket and the annular magnetic steel positioning bracket effectively reduces the difficulty of assembling the square magnetic steel and the annular magnetic steel, and directly positions them, effectively avoiding the problem of magnetic steel offset during assembly. The entire passive wheel speed sensor can effectively solve the problem of existing passive wheel speed sensors, such as unreasonable design of the skeleton assembly shell structure, difficulty in assembling the magnetic steel, and easy position offset affecting the quality.

[0009] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model.

[0011] Figure 2 It is a structural schematic diagram of the electromagnetic integrated block.

[0012] Figure 3 It is a structural schematic diagram of the skeleton assembly.

[0013] Figure 4 It is a structural schematic diagram of annular magnetic steel.

[0014] Figure 5 It is a schematic diagram of the structure of a square magnetic steel.

[0015] Among them, 1. outer shell, 2. signal detection head, 3. skeleton shell, 4. connecting plate, 5. skeleton assembly, 6. electromagnetic integrated block, 7. high positioning block, 8. low positioning block, 9. chamfer, 10. positioning step, 11. horizontal positioning table, 12. magnetic steel positioning surface, 13. ring magnetic steel, 14. square magnetic steel. DETAILED DESCRIPTION

[0016] Examples, such as Figures 1 to 5A passive wheel speed sensor is shown, comprising a housing 1 and a signal detection head 2 detachably mounted on the housing 1. The signal detection head 2 is integrally injection molded, and is provided with a group of external assembly holes adapted to the housing 1. An electromagnetic integrated block 6 is integrally injection molded in the signal detection head 2. The electromagnetic integrated block 6 includes a circuit integrated block, a square magnetic steel 14, and an annular magnetic steel 13. The circuit integrated block includes a skeleton assembly 5. The skeleton assembly 5 includes a skeleton shell 3 and a connecting piece 4. The inner ring side wall of the skeleton shell 3 is provided with an annular magnetic steel positioning bracket adapted to the annular magnetic steel 13. The inner ring side wall of the skeleton shell 3 is provided with a square magnetic steel positioning bracket adapted to the square magnetic steel 14 below the annular magnetic steel 13 positioning bracket. The skeleton assembly 5 is integrally injection molded by a magnetizer and a connecting piece 4. The annular magnetic steel 13 is arranged above the square magnetic steel, and the square magnetic steel 14 is arranged above the magnetizer. The magnetizer, the square magnetic steel 14, and the annular magnetic steel 13 are arranged concentrically.

[0017] The annular magnetic steel 13 positioning bracket includes six positioning blocks integrally injection-molded on the inner ring side wall of the skeleton shell 3, and the six positioning blocks are arranged at intervals around the inner ring side wall of the skeleton shell 3. The six positioning blocks include three high positioning blocks 7 and three low positioning blocks 8; the low positioning blocks 8 are respectively arranged between two high positioning blocks 7; the upper end plane of the low positioning block 8 is a horizontal positioning table 11 adapted to the bottom end face of the annular magnetic steel 13; the upper end planes of the high positioning blocks 7 and the low positioning blocks 8 are flush with each other and are provided with a placement step 1 adapted to the annular magnetic steel 13 0; the annular magnetic steel 13 is mounted on the placement step 10 and the horizontal positioning table 11; the outer side wall of the low positioning block 8 away from the inner ring side wall of the skeleton shell 3 is a magnetic steel positioning surface 12 adapted to the square magnetic steel 14; the outer side wall of the high positioning block 7 located below the placement step 10 is a magnetic steel positioning surface 12 adapted to the square magnetic steel 14; the magnetic steel positioning surfaces 12 of each high positioning block 7 and low positioning block 8 constitute a magnetic steel positioning area adapted to the outer side wall of the square magnetic steel 14, and each magnetic steel positioning surface 12 is connected to the corresponding outer side wall of the square magnetic steel 14.

[0018] Chamfers 9 are provided at the top of the outer wall of the high positioning block 7 which is away from the inner circle of the skeleton housing 3 and at the top of each magnetic steel positioning surface 12 .

[0019] The above is an exemplary description of the utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model; or the above concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A passive wheel speed sensor, characterized in that: It includes a shell and a signal detection head detachably mounted on the shell. The signal detection head is integrally injection-molded and is provided with a group of external assembly holes that are compatible with the shell. An electromagnetic integrated block is integrally injection-molded inside the signal detection head. The electromagnetic integrated block includes a circuit integrated block, a square magnetic steel, and an annular magnetic steel. The circuit integrated block includes a skeleton assembly. The skeleton assembly includes a skeleton shell and a connecting piece. An annular magnetic steel positioning bracket that is compatible with the annular magnetic steel is provided on the inner ring side wall of the skeleton shell. A square magnetic steel positioning bracket that is compatible with the square magnetic steel is provided on the inner ring side wall of the skeleton shell below the annular magnetic steel positioning bracket.

2. The passive wheel speed sensor according to claim 1, characterized in that: The annular magnetic steel positioning bracket includes six positioning blocks integrally injection-molded on the inner ring side wall of the skeleton shell, the six positioning blocks are arranged at intervals around the inner ring side wall of the skeleton shell, and the six positioning blocks include three high positioning blocks and three low positioning blocks; the low positioning blocks are respectively arranged between two high positioning blocks; the upper end plane of the low positioning block is a horizontal positioning table surface that is compatible with the bottom end face of the annular magnetic steel; the upper end planes of the high positioning block and the low positioning block are provided with placement steps that are compatible with the annular magnetic steel at a flush position; the annular magnetic steel is mounted on the placement steps and the horizontal positioning table surface; the outer side wall of the low positioning block away from the inner ring side wall of the skeleton shell is a magnetic steel positioning surface that is compatible with the square magnetic steel; the outer side wall of the high positioning block located below the placement step is a magnetic steel positioning surface that is compatible with the square magnetic steel; the magnetic steel positioning surfaces of each high positioning block and low positioning block constitute a magnetic steel positioning area that is compatible with the outer side wall of the square magnetic steel, and each magnetic steel positioning surface is connected to the corresponding outer side wall of the square magnetic steel.

3. The passive wheel speed sensor according to claim 2, characterized in that: The top of the outer wall of the high positioning block which is away from the inner circle of the skeleton shell and the top of each magnetic steel positioning surface are both chamfered.

4. The passive wheel speed sensor according to any one of claims 1 to 3, characterized in that: The skeleton assembly is integrally formed by injection molding of the magnetic conductor and the connecting piece.

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