Sensor

Abstract

The utility model discloses a sensor, comprising a sensor head which comprises a housing and a support, the housing comprises an inner cavity, and a part of the support is fixed in the inner cavity; the inner cavity comprises a sealing chamber, electronic elements are arranged on the support and located in the sealing chamber, and the sealing chamber is sealed and isolated from the outside. According to the utility model, gearbox oil can be prevented from directly contacting with electronic elements of the sensor.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a sensor. Background Art

[0002] It is well known that the function of the transmission sensor is vital and irreplaceable, and the current development trend of the transmission is that the structure is becoming more and more compact, the weight is becoming lighter and the volume is becoming smaller. This requires the sensor to be placed inside the transmission housing and be able to work normally while immersed in the transmission oil.

[0003] As more and more transmission sensors are immersed in transmission oil and used transmission oil contains sulfide, sulfur has a strong affinity with copper and silver and will generate copper sulfide (CuS) or silver sulfide (Ag2S). As copper sulfide continues to accumulate in areas where there is exposed copper in the sensor's electronic components, a copper sulfide bridge will be generated, causing the sensor to have a short circuit risk. Utility Model Content

[0004] The utility model aims to solve the problem that the transmission oil contacts the electronic components of the sensor to generate copper sulfide, and accumulates in the area where the electronic components have exposed copper to generate copper sulfide bridges, causing the sensor to short-circuit. The utility model provides a sensor that can prevent the transmission oil from contacting the electronic components of the sensor.

[0005] In order to solve the above technical problems, the embodiment of the utility model discloses a sensor, comprising:

[0006] The sensor head comprises a shell and a bracket, wherein the shell comprises an inner cavity, and a part of the bracket is fixed in the inner cavity;

[0007] The inner cavity comprises a sealed chamber, the bracket is provided with an electronic component, the electronic component is located in the sealed chamber, and the sealed chamber is sealed and isolated from the outside.

[0008] By adopting the above technical solution, a part of the bracket is placed in the inner cavity of the shell, so that the electronic components on the bracket are also located in the inner cavity, and the sealed chamber in the inner cavity wraps the electronic components on the bracket, and the sealed chamber is sealed and isolated from the outside, so that the electronic components are isolated from the external environment. When the oil in the gearbox flows to the sensor, it is blocked outside the sealed chamber and cannot contact the electronic components. Then, the sulfide in the oil cannot accumulate with the area where the exposed copper on the electronic components exists to generate a copper sulfide bridge, thereby effectively avoiding the sensor from short-circuiting due to the copper sulfide bridge.

[0009] According to another specific embodiment of the utility model, the upper end of the inner cavity is open and the lower end is closed, and epoxy resin is filled in the inner cavity, and the epoxy resin is cured to form the sealed chamber.

[0010] By adopting the above technical solution, the upper end of the inner cavity is open and the lower end is closed to facilitate the encapsulation of epoxy resin, thereby forming a sealed chamber to wrap the electronic components on the bracket, isolating them from the external environment, and preventing the sulfides in the oil from forming copper sulfide in the area where the exposed copper on the electronic components exists.

[0011] According to another specific embodiment of the utility model, the side wall of the inner cavity is provided with a plurality of limiting portions, and the plurality of limiting portions are all in contact with the bracket to limit the movement of the bracket in the inner cavity along the width direction and the thickness direction of the shell.

[0012] By adopting the above technical solution, multiple limiting parts ensure multiple contact positions between the bracket and the shell, thereby improving the stability of the bracket in the inner cavity and preventing the bracket from shaking in the inner cavity and affecting the detection accuracy of the sensor.

[0013] According to another specific embodiment of the present invention, the bracket includes a terminal, a magnet and a support member, the electronic component is fixed to the terminal, and the magnet and the terminal are fixed to the support member.

[0014] According to another specific embodiment of the present invention, the bracket is injection molded in one step.

[0015] By adopting the above technical solution, the terminal, the magnet and the support are injection molded together to form a bracket, and then the electronic components are assembled on the terminal of the bracket to ensure the accuracy requirement of the sensor.

[0016] According to another specific embodiment of the present invention, the terminal uses brass CuZn30 as a base material.

[0017] By adopting the above technical solution, since Zn has a good affinity, the generation of free copper ions in the terminal substrate can be reduced, thereby reducing the copper sulfide generated by the sulfide in the transmission oil and the free copper ions in the terminal substrate.

[0018] According to another specific embodiment of the present utility model, the sensor further includes a connector and a mounting flange, and the connector, the mounting flange and the sensor head are formed in one step by injection molding.

[0019] According to another specific implementation of the present utility model, the shell, the support member of the bracket, the connector and the mounting flange are all made of PPS material.

[0020] By adopting the above technical solution, PPS (Polyphenylene sulfide, Chinese name polyphenylene sulfide) material has a series of excellent performance characteristics, such as high temperature stability, chemical corrosion resistance and wear resistance. As a sensor to be used in transmission oil, PPS material can enable it to maintain its performance for a long time and avoid problems such as chemical corrosion.

[0021] According to another specific implementation of the utility model, the electronic component includes a resistor and a chip, and the resistor and the chip are fixed on the terminal.

[0022] With the above technical solution, after the bracket is injection molded, the resistor and the chip are assembled to the terminal to ensure the accuracy requirement of the sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional diagram showing a sensor according to an embodiment of the utility model;

[0024] Figure 2 A three-dimensional diagram showing a sensor head according to an embodiment of the present utility model;

[0025] Figure 3 A three-dimensional diagram showing a housing of an embodiment of the utility model;

[0026] Figure 4 A three-dimensional diagram showing a bracket according to an embodiment of the utility model;

[0027] Figure 5 A cross-sectional view of a sensor according to an embodiment of the utility model is shown;

[0028] Figure 6 A cross-sectional view of a housing according to an embodiment of the present utility model is shown. DETAILED DESCRIPTION

[0029] The following is an explanation of the implementation of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0030] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0031] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0032] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0033] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0034] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] refer to Figure 1 The present application provides a sensor 1, comprising: a sensor head 2, a connector 3 and a mounting flange 4, wherein the connector 3, the mounting flange 4 and the sensor head 2 are formed in one step by injection molding.

[0036] Specifically, the sensor 1 may be a gearbox sensor, or other sensors that need to be immersed in oil containing sulfides. The present application uses a gearbox sensor as an example for explanation.

[0037] refer to Figure 2 and Figure 3 The sensor head 2 includes a housing 20 and a bracket 21, and the housing 20 includes an inner cavity 200. Exemplarily, the housing 20 is in a rectangular parallelepiped shape, and its interior is hollow to form the inner cavity 200, and the upper end of the inner cavity 200 is open and the lower end is closed.

[0038] refer to Figure 4The bracket 21 includes a terminal 210, a magnet 211 and a support member 212. Exemplarily, the bracket 21 is injection molded in one step, and specifically, the magnet 211 and the terminal 210 are fixedly connected to the support member 212 by injection molding, thereby ensuring the reliability of the connection between the terminal 210, the magnet 211 and the support member 212.

[0039] Exemplarily, the sensor 1 of the present application completes its production process through two moldings. Specifically, the first molding is the injection molding of the bracket 21, and the terminal 210, the magnet 211 and the support 212 are injection molded together to form the bracket 21. The second molding is the injection molding of the sensor head 2, the connector 3 and the mounting flange 4 to form a complete sensor 1. Among them, before the second molding, the electronic component 5 needs to be assembled on the bracket 21 to ensure the accuracy requirements of the sensor 1.

[0040] For example, reference Figure 1 , Figure 4 and Figure 5 The connector 3 of the sensor 1 includes a first part 30 and a second part 31, the support member 212 includes an upper end portion 213, the upper end portion 213 is connected to the first part 30 of the connector 3, and the terminal 210 passes through the upper end portion 213 of the support member 212 and the first part 30 of the connector 3, and extends into the cavity 32 of the second part 31 of the connector 3 to be electrically connected to the vehicle controller.

[0041] Exemplarily, the terminal 210 on the bracket 21 is fixedly mounted with an electronic component 5 to ensure the accuracy requirement of the sensor 1 .

[0042] Specifically, the electronic component 5 includes a resistor 50 and a chip 51 . After the bracket 21 is injection molded, the resistor 50 and the chip 51 are assembled to the terminal 210 by welding.

[0043] For example, the terminal 210 is made of brass CuZn30 as the base material. Since Zn has a good affinity, it can reduce the generation of free copper ions in the terminal base material, thereby reducing the copper sulfide generated by the sulfide in the transmission oil and the free copper ions in the terminal base material.

[0044] Exemplarily, the support member 212 of the bracket 21 extends into the inner cavity 200 from the upper end opening of the inner cavity 200, and the resistor 50 and the chip 51 on the support member 212 also enter the inner cavity 200, while a portion of the terminal 210 is located in the inner cavity 200, and the other portion extends out of the inner cavity 200. Then, epoxy resin is poured into the inner cavity 200, and the epoxy resin is cured to form a sealed chamber 6. The sealed chamber 6 formed by the epoxy resin wraps up the portion of the bracket 21 on which the resistor 50 and the chip 51 are installed, thereby isolating the resistor 50 and the chip 51 located on the bracket 21 from the external environment. The oil in the gearbox flows from the chamber 32 of the second part 31 of the connector 3 along the extension direction of the terminal 210 to the sensor (such as Figure 5 When the chip 51 is moved in the direction of the arrow shown in the figure, it is blocked outside the sealed chamber 6 and cannot contact the resistor 50 and the chip 51.

[0045] That is, the present application forms a sealed chamber 6 by wrapping the bracket 21 with epoxy resin to isolate the resistor 50 and the chip 51 from the external environment, so that the oil in the gearbox cannot contact the resistor 50 and the chip 51, and the sulfide in the oil cannot accumulate with the area where the exposed copper on the resistor 50 and the chip 51 exists to form a copper sulfide bridge, thereby avoiding a short circuit of the sensor 1 due to the copper sulfide bridge.

[0046] On the other hand, the curing of the epoxy resin poured into the inner cavity 200 also achieves the fixation of the bracket 21 relative to the shell 20 .

[0047] For example, the epoxy resin used in this embodiment has a model of EO 1058.

[0048] refer to Figure 3 and Figure 6 In some possible embodiments, the side wall 205 of the inner cavity 200 is provided with a plurality of limit portions 7, and the plurality of limit portions 7 are all in contact with the bracket 21 to limit the bracket 21 in the inner cavity 200 along the width direction of the shell 20 ( Figure 3 and Figure 6 X direction) and thickness direction ( Figure 3 and Figure 6 Exemplarily, the limiting portion 7 is a pointed protrusion, that is, the limiting portion 7 protrudes from the wall surface of the side wall 205, and the limiting portion 7 extends from the bottom wall of the inner cavity 200 along the height direction of the shell 20 ( Figure 3 and Figure 6 The tip of each limiting portion 7 abuts against the support member 212 of the bracket 21, thereby limiting the movement of the bracket 21 in the inner cavity 200.

[0049] Specifically, Figure 6As shown, the cross section of the inner cavity 200 in the height direction of the housing 20 is rectangular, and its side wall 205 includes four wall surfaces, wherein the first wall surface 201 and the third wall surface 203 are arranged along the width direction of the housing 20 ( Figure 6 The first wall 201 and the third wall 203 are relatively arranged along the width direction of the shell 20, and both are in contact with the support member 212, thereby limiting the movement of the bracket 21 in the inner cavity 200 along the width direction of the shell 20.

[0050] The second wall surface 202 and the fourth wall surface 204 are arranged along the thickness direction ( Figure 6 The second wall 202 and the fourth wall 204 are respectively provided with two limiting portions 7, and the two limiting portions 7 on the second wall 202 and the two limiting portions 7 on the fourth wall 204 are both along the width direction of the housing 20 ( Figure 6 The two limiting portions 7 on the second wall 202 and the two limiting portions 7 on the fourth wall 204 are arranged at intervals along the thickness direction of the shell 20, and the two limiting portions 7 on the second wall 202 and the two limiting portions 7 on the fourth wall 204 are arranged in a staggered manner along the thickness direction of the shell 20. That is, the two limiting portions 7 on the second wall 202 and the two limiting portions 7 on the fourth wall 204 are not in a two-to-two relationship in the thickness direction of the shell 20. The two limiting portions 7 on the second wall 202 and the two limiting portions 7 on the fourth wall 204 are both in contact with the support member 212, thereby limiting the movement of the bracket 21 in the inner cavity 200 along the thickness direction of the shell 20.

[0051] As mentioned above, the four wall surfaces (the first wall surface 201, the second wall surface 202, the third wall surface 203, and the fourth wall surface 204) of the side wall 205 of the inner cavity 200 are all provided with a limiting portion 7, and each limiting portion 7 extends upward to a set distance along the height direction of the shell 20, thereby ensuring multiple contact positions between the bracket 21 and the shell 20, thereby improving the stability of the bracket 21 in the inner cavity 200 and preventing the bracket 21 from shaking in the inner cavity 200, thereby affecting the detection accuracy of the sensor 1.

[0052] As described above, in this embodiment, a total of six limiting portions 7 are provided on the side wall 205 of the inner cavity 200 to abut against the bracket 21 to achieve relative fixation of the bracket 21, but those skilled in the art can understand that in other embodiments, other numbers and shapes of limiting portions 7 can also be set to achieve the limiting function of the bracket 21.

[0053] refer to Figure 1 and Figure 5In some possible implementations, the housing 20, the support member 212, the connector 3 and the mounting flange 4 are all made of PPS (Polyphenylene sulfide). For example, PPS has a series of excellent performance characteristics, such as high temperature stability, chemical corrosion resistance and wear resistance. For sensors to be used in transmission fluid, PPS can maintain its performance for a long time and avoid problems such as chemical corrosion.

[0054] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A sensor, characterized in that: include: The sensor head comprises a shell and a bracket, wherein the shell comprises an inner cavity, and a part of the bracket is fixed in the inner cavity; The inner cavity comprises a sealed chamber, the bracket is provided with an electronic component, the electronic component is located in the sealed chamber, and the sealed chamber is sealed and isolated from the outside.

2. The sensor according to claim 1, characterized in that The inner cavity has an open upper end and a closed lower end. Epoxy resin is filled in the inner cavity and cured to form the sealed chamber.

3. The sensor according to claim 2, characterized in that The side wall of the inner cavity is provided with a plurality of limiting parts, and the plurality of limiting parts are all in contact with the bracket to limit the bracket from moving in the inner cavity along the width direction and the thickness direction of the shell.

4. The sensor according to claim 1, characterized in that The bracket includes a terminal, a magnet and a support member, the electronic component is fixed to the terminal, and the magnet and the terminal are fixed to the support member.

5. The sensor according to claim 4, characterized in that The bracket is injection molded in one step.

6. The sensor according to claim 4, characterized in that The terminal is made of brass CuZn30 as a base material.

7. The sensor according to claim 4, characterized in that The sensor further comprises a connector and a mounting flange, and the connector, the mounting flange and the sensor head are formed in one step by injection molding.

8. The sensor according to claim 7, characterized in that The shell, the support member of the bracket, the connector and the mounting flange are all made of PPS material.

9. The sensor according to claim 4, characterized in that The electronic component comprises a resistor and a chip, and the resistor and the chip are fixed on the terminals.

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