阅读说明：本技术 一种速度传感器及其制作方法 (Speed sensor and manufacturing method thereof ) 是由 赵特奇 李金亮 李旺 于 2020-08-13 设计创作，主要内容包括：本发明提供一种速度传感器及其制作方法,速度传感器包括支架、固定座、芯片和背磁。其中,支架具有沿其厚度方向凹陷的第一凹槽；固定座设于第一凹槽内,固定座设有第二凹槽。此结构的速度传感器,安装部的一端通过第二凹槽的槽口与背磁抵接,安装腔与安装部相匹配,安装部装入安装腔后,使安装部的两端面分别紧密抵接在第一壁面和背磁上,安装部与背磁之间缝隙小,注塑塑料不会进入安装部与背磁之间的缝隙,使安装部与背磁之间无塑料隔绝且两者之间间隙小,传感器信号传输稳定；并且通过安装腔的设置芯片与背磁无需先封装为一体即可保证两者紧密接触,可降低传感器的生产成本。(The invention provides a speed sensor and a manufacturing method thereof. Wherein, the bracket is provided with a first groove which is concave along the thickness direction; the fixing seat is arranged in the first groove and is provided with a second groove. One end of the mounting part is abutted to the back magnet through the notch of the second groove, the mounting cavity is matched with the mounting part, after the mounting part is mounted in the mounting cavity, two end faces of the mounting part are respectively abutted to the first wall face and the back magnet tightly, a gap between the mounting part and the back magnet is small, injection molding plastics cannot enter the gap between the mounting part and the back magnet, no plastic isolation exists between the mounting part and the back magnet, the gap between the mounting part and the back magnet is small, and signal transmission of the sensor is stable; and through the setting chip of installation cavity and back of the body magnetism need not earlier the encapsulation as an organic whole can guarantee both in close contact with, can reduce the manufacturing cost of sensor.)

1. A speed sensor, comprising

A bracket (1) having a first groove (11) recessed in a thickness direction thereof; two opposite side walls of the first groove (11) along the length direction of the bracket (1) are respectively a first wall surface (111) and a second wall surface (112);

the fixing seat (2) is arranged in the first groove (11), a first end, close to the first wall surface (111), of the fixing seat (2) is provided with a second groove (21) which is sunken from outside to inside, and a second end, opposite to the first end, of the fixing seat (2) abuts against the second wall surface (112);

a chip including a mounting portion (31) extending in the thickness direction of the bracket (1) and an extending portion (32) bent in the longitudinal direction of the bracket (1);

the back magnet (4) is arranged in the second groove (21), and the end face of the back magnet (4) facing to the third end of the first wall surface (111) is flush with the outer wall surface of the notch of the second groove (21);

the first wall surface (111) and two side walls of the first groove (11) in the width direction of the bracket (1) and a notch of the second groove (21) form an installation cavity (6) matched with and tightly clamped with the installation part (31);

installation department (31) joint is in installation cavity (6), the both ends of installation department (31) respectively the butt in first wall (111) with on back of the body magnetism (4).

2. The speed sensor according to claim 1, wherein the notch of the second groove (21) is provided with a first abutting portion (22) and a second abutting portion (23) on both side ends in the width direction of the bracket (1), respectively;

the mounting cavity (6) is defined by the first wall surface (111) and the notches of the first abutting part (22), the second abutting part (23) and the second groove (21).

3. The speed sensor according to claim 2, characterized in that the bottom of the notch of the second groove (21) is provided with a blocking part (24) protruding towards the mounting cavity (6), the blocking part (24) is positioned between the first abutting part (22) and the second abutting part (23), and the inner side wall of the blocking part (24) abuts against one end face of the back magnet (4);

the mounting cavity (6) is defined by the first wall surface (111) and the notches of the first abutting part (22), the second abutting part (23), the blocking part (24) and the second groove (21).

4. A speed sensor according to any one of claims 1-3, wherein at least one resilient member (25) is provided at a second end of the holder (2), the second end abuts against the second wall surface (112) via the resilient member (25), and the resilient member (25) exerts a biasing force on the holder (2) and the back magnet (4) in a direction towards the first wall surface (111) under the abutting force of the second wall surface (112).

5. A speed sensor according to claim 4, characterised in that said resilient members (25) are at least two, wherein two of said resilient members (25) are provided on opposite sides of said second end surface.

6. A speed sensor according to claim 5, characterised in that one end of any of said elastic elements (25) is formed on said second end, the other end being bent inwards towards the middle of the holder (2) and abutting against said second wall (112).

7. A speed sensor according to any one of claims 1-3, characterized in that the top of the holder (2) is provided with a first protrusion (26) protruding upwards;

the extension portion (32) is provided with a mounting hole extending along the length direction of the support (1), and the mounting hole is sleeved and fixed on the first protruding portion (26).

8. The speed sensor according to claim 7, characterized in that the extension (32) has two electrode ends;

the speed sensor further comprises two conductive parts (5), the conductive parts (5) correspond to the electrode ends one to one, one ends of the conductive parts (5) penetrate through the support (1) and are electrically connected with the corresponding electrode ends, and the other ends of the conductive parts extend out of the support (1).

9. A speed sensor according to claim 8, characterized in that said first recess (11) is a stepped groove, the lower recess providing for the mounting of said holder (2) and the upper recess providing for the mounting of said conductive member (5) and said electrode tip.

10. A method for manufacturing a speed sensor is characterized by comprising the following steps:

the fixing seat (2) is formed outside the back magnet (4) in an injection molding mode, and a notch of a second groove (21) for leaking the end face of the third end of the back magnet (4) is formed in the fixing seat (2);

the fixing seat (2) is arranged in a first groove (11) of the bracket (1), and two opposite side walls of the first groove (11) along the length direction of the bracket (1) are respectively a first wall surface (111) and a second wall surface (112); the first end of the fixed seat (2) is close to the first wall surface (111), and the second end of the fixed seat (2) is opposite to the first end and is abutted against the second wall surface (112); a mounting cavity (6) for tightly clamping a mounting part (31) of the chip is defined by the first wall surface (111) of the first groove (11), two side walls of the first groove (11) in the width direction of the bracket (1) and a notch of the second groove (21);

and installing an installation part (31) of a chip in the installation cavity (6) to enable two opposite surfaces of the installation part (31) to be respectively and tightly abutted on the third end surface of the back magnet (4) and the first wall surface (111).

Technical Field

The invention relates to the technical field of sensors, in particular to a speed sensor and a manufacturing method thereof.

Background

Most sensors are magnetoelectric sensors based on Hall effect, and have the characteristics of high sensitivity to magnetic field, stable output signal, high frequency response, strong anti-electromagnetic interference capability, simple structure, convenient use and the like. At present, the brake system is widely applied to traction systems and brake systems in the fields of high-speed railway locomotives, urban rail vehicles, electric automobiles, new energy automobiles and the like.

The speed sensor comprises a chip and a back magnet, and in order to ensure the stability of output signals of the sensor, the chip and the back magnet need to be attached together. In the speed sensor with the structure, the chip and the back magnet need to be packaged firstly and then are arranged in the bracket, so that the production cost of the sensor is high.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect of high production cost of the speed sensor in the prior art.

To this end, the invention provides a speed sensor comprising

A bracket having a first groove depressed in a thickness direction thereof; two opposite side walls of the first groove along the length direction of the bracket are respectively a first wall surface and a second wall surface;

the fixed seat is arranged in the first groove, a first end, close to the first wall surface, of the fixed seat is provided with a second groove which is concave from outside to inside, and a second end, opposite to the first end, of the fixed seat is abutted against the second wall surface;

a chip including a mounting portion extending in a thickness direction of the bracket and an extending portion bent toward a length direction of the bracket;

the back magnet is arranged in the second groove, and the end face of the back magnet, facing the third end of the first wall face, is flush with the outer wall face of the notch of the second groove;

the first wall surface, two side walls of the first groove in the width direction of the bracket and a notch of the second groove form an installation cavity matched with and tightly clamped by the installation part;

the installation department joint is in the installation intracavity, the both ends of installation department respectively the butt in first wall with on the back of the body magnetism.

Optionally, in the speed sensor, the notch of the second groove is provided with a first abutting portion and a second abutting portion at two ends of the bracket in the width direction, respectively;

the first wall surface and the notches of the first abutting part, the second abutting part and the second groove form the installation cavity in a surrounding mode.

Optionally, in the speed sensor, a blocking portion protruding toward the mounting cavity is disposed at a bottom of the notch of the second groove, the blocking portion is located between the first abutting portion and the second abutting portion, and an inner side wall of the blocking portion abuts against an end face of the back magnet;

the first wall surface and the notches of the first abutting part, the second abutting part, the blocking part and the second groove are encircled to form the mounting cavity.

Optionally, in the speed sensor, at least one elastic member is disposed at a second end of the fixing base, the second end abuts against the second wall surface through the elastic member, and the elastic member applies a biasing force to the fixing base and the back magnet toward the first wall surface under the abutting force of the second wall surface.

Optionally, in the speed sensor, there are at least two elastic members, where two elastic members are disposed on opposite sides of the second end surface.

Optionally, in the speed sensor, one end of any one of the elastic members is formed on the second end, and the other end of the elastic member is bent inward toward the middle of the fixing seat and abuts against the second wall surface.

Optionally, in the speed sensor, a first protruding portion protrudes upward from the top of the fixing base;

the extension part is provided with a mounting hole extending along the length direction of the support, and the mounting hole is sleeved and fixed on the first protruding part.

Optionally, in the speed sensor described above, the extension has two electrode ends;

the speed sensor also comprises two conductive parts, the conductive parts correspond to the electrode ends one to one, one ends of the conductive parts penetrate through the support and are electrically connected with the corresponding electrode ends, and the other ends of the conductive parts extend out of the support.

Optionally, in the speed sensor, the first groove is a stepped groove, the groove below the first groove is used for installing the fixing seat, and the groove above the first groove is used for installing the conductive part and the electrode terminal.

The invention provides a manufacturing method of a speed sensor, which comprises the following steps:

a fixed seat is formed outside the back magnet in an injection molding mode, and a notch of a second groove for leaking the end face of the third end of the back magnet is formed in the fixed seat;

the fixing seat is arranged in a first groove of the bracket, and two opposite side walls of the first groove along the length direction of the bracket are respectively a first wall surface and a second wall surface; the first end of the fixed seat is close to the first wall surface, and the second end of the fixed seat is opposite to the first end and is abutted against the second wall surface; a mounting cavity for tightly clamping the mounting part of the chip is defined by the first wall surface of the first groove, two side walls of the first groove in the width direction of the bracket and the notch of the second groove;

and installing the installation part of the chip in the installation cavity to enable the two opposite surfaces of the installation part to be respectively and tightly abutted against the third end face of the back magnet and the first wall face.

The technical scheme of the invention has the following advantages:

1. the speed sensor provided by the invention comprises a bracket, a fixed seat, a chip and a back magnet. Wherein, the bracket is provided with a first groove which is concave along the thickness direction; two opposite side walls of the first groove along the length direction of the bracket are respectively a first wall surface and a second wall surface; the fixed seat is arranged in the first groove, a first end of the fixed seat close to the first wall surface is provided with a second groove which is sunken from outside to inside, and a second end of the fixed seat opposite to the first end is abutted against the second wall surface; the chip includes an installation portion extending in the thickness direction of the bracket and an extension portion bent toward the length direction of the bracket.

One end of the mounting part is abutted to the back magnet through the notch of the second groove, the mounting cavity is matched with the mounting part, after the mounting part is mounted in the mounting cavity, two end faces of the mounting part are respectively abutted to the first wall face and the back magnet tightly, a gap between the mounting part and the back magnet is small, injection molding plastics cannot enter the gap between the mounting part and the back magnet, no plastic isolation exists between the mounting part and the back magnet, the gap between the mounting part and the back magnet is small, and signal transmission of the sensor is stable; and through the setting chip of installation cavity and back of the body magnetism need not earlier the encapsulation as an organic whole can guarantee both in close contact with, can reduce the manufacturing cost of sensor.

2. The manufacturing method of the speed sensor comprises the steps of firstly, injection molding a fixed seat outside a back magnet and forming a notch of a second groove for leaking the end face of the third end of the back magnet, wherein the back magnet can be firmly fixed in the second groove of the fixed seat, and meanwhile, the notch of the second groove reserved by injection molding can be used for enabling the back magnet to be abutted to an installation part of a chip; then the fixed seat is arranged in the first groove of the bracket, so that the second end of the fixed seat is abutted against the second wall surface; a mounting cavity is defined by the first wall surface of the first groove, two side walls of the first groove in the width direction of the support and the notch of the second groove; install the installation department of chip and make in the installation cavity the relative both ends face of installation department butt respectively on the third terminal surface and the first wall of back of the body magnetism, need not to encapsulate as an organic whole earlier with the back of the body magnetism through the setting of installation cavity chip can guarantee both in close contact with, can reduce the cost of manufacture of sensor.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic view of a speed sensor provided in embodiment 1 of the present invention;

FIG. 2 is a top view of the velocity sensor after the sealant in the first groove has been removed;

FIG. 3 is a schematic diagram of the internal structure of the speed sensor;

FIG. 4 is a first angle schematic of FIG. 3 with the chip removed;

FIG. 5 is a second angle view of FIG. 3 with the chip removed;

FIG. 6 is a schematic view of a stent;

FIG. 7 is a schematic view of the engagement of the mounting base, chip and conductive member;

FIG. 8 is a first angle diagram illustrating the engagement between the fixing base and the back magnet;

FIG. 9 is a second angle diagram illustrating the engagement between the fixing base and the back magnet;

FIG. 10 is a schematic view of the fixing base;

fig. 11 is a schematic view showing a use state of the speed sensor.

Description of reference numerals:

1-a scaffold; 11-a first groove; 111-a first wall; 112-a second wall; 2-a fixed seat; 21-a second groove; 22-a first abutment; 23-a second abutment; 24-a barrier; 25-an elastic member; 26-a first projection; 31-a mounting portion; 32-an extension; 4-back magnetism; 5-a conductive member; 6-installation cavity.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.