Gearbox pressure sensor

Abstract

The utility model provides a gearbox pressure sensor, and relates to the technical field of sensors, the pressure sensor comprises a housing, the housing is internally provided with an inner cavity and a pressure sensing channel, and the pressure sensing channel is communicated with the inner cavity; the pressure sensing core body is arranged in the inner cavity; the circuit board is arranged in the inner cavity, the circuit board comprises a circuit board body and an extension part extending out of one end of the circuit board body, and one end of the circuit board body is connected with the pressure sensing core body; one end of the connecting piece is connected with the shell, and the other end of the circuit board body is electrically connected with the connecting piece; the connecting piece is arranged in the inner cavity, the extending part is arranged in the inner cavity, the plug body is arranged in the inner cavity, one end of the plug body is attached to the connecting piece, the other end of the plug body is attached to the extending part, at least part of the extending part is attached to the shell, and the gearbox pressure sensor has the advantages of being good in manufacturability and low in cost.

Description

Technical Field

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

[0002] The transmission hydraulic oil enters the pressure sensor through the pressure pipeline and acts on the tiny diaphragm on the pressure-sensitive core to sense the pressure changes of the hydraulic oil. As the hydraulic oil pressure changes, the pressure sensor transmits pressure information to the engine control module (ECM) or transmission control module (TCM) with a specific voltage signal to control the efficiency of the transmission.

[0003] The gearbox pressure sensor in the prior art has problems in design, processing and manufacturing, and high cost. In addition, there are problems such as the flexible circuit board is not compatible with the automatic welding line and the grounding reliability is poor. Utility Model Content

[0004] The utility model aims to overcome the defects of the prior art and provides a gearbox pressure sensor to reduce the manufacturing cost and processing difficulty of the gearbox pressure sensor and improve the grounding reliability.

[0005] In order to achieve the above purpose and other purposes, the utility model is implemented by including the following technical solutions: the utility model provides a gearbox pressure sensor, the gearbox pressure sensor including: a shell, the shell is provided with an inner cavity and a pressure-sensitive channel, the pressure-sensitive channel and the inner cavity are communicated; a pressure-sensitive core is arranged in the inner cavity; a circuit board is arranged in the inner cavity, the circuit board includes a circuit board body and an extension portion extending from one end of the circuit board body, one end of the circuit board body is electrically connected to the pressure-sensitive core; a connecting piece, one end of the connecting piece is connected to the shell, and the other end of the circuit board body is electrically connected to the connecting piece; and a plug body is arranged in the inner cavity, one end of the plug body is abutted against the connecting piece, the other end of the plug body is abutted against the extension portion, and the extension portion is at least partially abutted against the shell.

[0006] In one embodiment, the shell has a main body end and a connecting end, one end of the main body end is connected to one end of the connecting end, and the other end of the main body end is connected to the connecting member.

[0007] In one embodiment, the outer surface of the connecting end is provided with threads.

[0008] In one embodiment, the bottom of the inner cavity has a groove, a first sealing ring is arranged in the groove, and the pressure-sensitive core is located on the first sealing ring.

[0009] In one embodiment, the circuit board is a flexible circuit board.

[0010] In one embodiment, the connector includes a connector body and a conductive member located in the connector body, and the conductive member is connected to the circuit board.

[0011] In one embodiment, the connector body is provided with a concave ring at the outer side wall in the inner cavity, and a second sealing ring is provided inside the concave ring.

[0012] In one embodiment, a slot is provided on the bottom outer side wall of the connector body, and the plug body is at least partially located in the slot.

[0013] In one embodiment, the bottom of the connector body has a receiving cavity in the inner cavity, and the circuit board body is at least partially located in the receiving cavity.

[0014] In one embodiment, an acute angle is formed between the extension portion and the inner cavity side wall.

[0015] The utility model provides a gearbox pressure sensor. Compared with the prior art, the utility model has the following beneficial effects: the gearbox pressure sensor provided by the utility model extends a part of the length on the original circuit board as an extension part and adds a rubber plug to be in inclined contact with the shell and grounded, so that the manufacturability and cost are greatly improved.

[0016] The utility model can stably ground the electrical components in the pressure sensor by designing an extension portion on the circuit board as a grounding end in contact with the shell, and a slot is opened on the connecting piece to place the plug body, so that the extension portion can be stably squeezed and clamped by the plug body and tilted against the shell, thereby improving the stability and reliability of the sensor grounding, and the flexible circuit board only needs to be provided with an extension portion, and a slot is opened on the connecting piece to place the plug body, which is convenient for processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic structural diagram of the pressure sensor of the utility model.

[0018] Figure 2 Shown is a cross-sectional view of the pressure sensor of the present invention.

[0019] Figure 3 Shown is a schematic diagram of the explosion structure of the pressure sensor of the utility model.

[0020] Figure 4 Shown is a schematic diagram of the explosion structure of the pressure sensor of the utility model.

[0021] Figure 5 Shown is a schematic structural diagram of the connecting piece of the utility model.

[0022] Figure 6Shown is a cross-sectional view of the extension portion and the plug body of the present invention.

[0023] Figure 7 Shown is a schematic structural diagram of the circuit board soldering of the utility model.

[0024] Numbers in the figure:

[0025] 1-shell, 11-main body end, 12-connection end, A-curling edge, 11a-inner cavity, 11b-groove, 12a-thread, 12b-pressure sensing channel;

[0026] 2- first sealing ring;

[0027] 3-Pressure-sensitive core;

[0028] 4-circuit board, 41-circuit board body, 42-extension part;

[0029] 5-connecting member, 51-connecting member body, 52-conducting member, 51a-recessed ring, 51b-accommodating cavity, 51c-slot hole;

[0030] 6- plug body;

[0031] 7- second sealing ring;

[0032] 8-The third sealing ring. DETAILED DESCRIPTION

[0033] See also Figures 1 to 7 The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0034] like Figure 1 and Figure 2 The utility model provides a gearbox pressure sensor, which includes a shell 1, which is a metal shell 1, and has an inner cavity 11a. The shell 1 includes a main body end 11 and a connecting end 12 connected to the main body end 11, and the outer diameter of the connecting end 12 is smaller than the outer diameter of the main body end 11. The outer surface of the connecting end 12 has a thread 12a, and the connecting end 12 has a pressure sensing channel 12b, which is communicated with the inner cavity 11a, and the bottom of the inner cavity 11a has a groove 11b, and a first sealing ring 2 is arranged in the groove 11b, and the first sealing ring 2 can prevent the medium in the pressure sensing channel 12b from penetrating into the interior of the sensor.

[0035] like Figure 2and Figure 3 As shown, the pressure sensor includes a pressure-sensitive core 3, and the pressure-sensitive core 3 is located in the inner cavity 11a. The bottom of the pressure-sensitive core 3 is at least partially connected to the pressure-sensitive channel 12b. The pressure-sensitive core 3 is located on the first sealing ring 2. The pressure-sensitive core 3 can be a pressure-sensitive core 3 of a ceramic diaphragm. The pressure-sensitive core 3 can be subjected to the pressure of the medium in the pressure-sensitive channel 12b and then undergo a slight deformation. The displacement deformation signal change is transmitted to the chip on the circuit board 4 and corresponding signal processing is performed, and finally the pressure signal is output through the conductive member 52.

[0036] like Figure 3 and Figure 7 As shown, the pressure sensor includes a circuit board 4, and the circuit board 4 can be a flexible circuit board. The circuit board 4 can include a circuit board body 41 and an extension portion 42 located at one end of the circuit board body 41. One end of the circuit board body 41 can be electrically connected to the pressure-sensitive core 3, and the connection can be welding, and the welding can be soldering. The corresponding structure of the pressure sensor can realize automatic soldering of the flexible circuit board 4, and the extension portion 42 can have an acute angle with the side wall of the inner cavity 11a of the shell 1.

[0037] like Figure 2 and Figure 3 As shown, the pressure sensor includes a connector 5, one end of which is connected to the main body end 11 of the shell 1, one end of the connector 5 is located in the inner cavity 11a, and the other end of the connector 5 is located outside the inner cavity 11a. The connector 5 includes a connector body 51 and a conductive member 52 located inside the connector body 51, the conductive member 52 is connected to the other end of the circuit board body 41, and the connection can be welding. The outer side wall of one end of the connector body 51 located in the inner cavity 11a has a concave ring 51a, and a second sealing ring 7 is arranged in the concave ring 51a. The outer side of the second sealing ring 7 is against the side wall of the inner cavity 11a. The second sealing ring 7 can prevent gearbox oil and dust from entering the inner cavity 11a.

[0038] like Figure 5 As shown, the connector body 51 has a accommodating cavity 51b at the bottom of the inner cavity 11a, and a slot 51c may be provided on the outer wall of the accommodating cavity 51b at the extension portion 42. The circuit board body 41 may be at least partially disposed in the accommodating cavity 51b, and the extension portion 42 may extend out of the accommodating cavity 51b and contact the shell 1.

[0039] like Figure 6As shown, the gearbox pressure sensor includes a plug body 6, one end of the plug body 6 abuts against the connecting member 5, and the other end of the plug body 6 abuts against the extension portion 42. The plug body 6 can be a rubber plug or an elastic column. The plug body 6 can be inserted into the slot 51c and located on the inner side of the extension portion 42. The plug body 6 at least partially abuts against the extension portion 42, and the extension portion 42 at least partially abuts against the shell 1. The plug body 6 and the shell 1 can limit the extension portion 42.

[0040] like Figure 1 As shown, the connection end 12 of the housing 1 is sleeved with a third sealing ring 8 at one end close to the main body end 11, and the third sealing ring 8 can form a certain sealing performance with the pipeline of the detection medium.

[0041] The installation of the utility model may include: pre-assembling the pressure-sensitive core 3, the circuit board 4 and the connector 5, placing the plug 6 into the slot 51c, and assembling the first sealing ring 2 and the second sealing ring 7 and placing the whole into the inner cavity 11a, and finally curling the main body end 11 of the housing 1 through the riveting process of curling A to form a connection with the connector 5, and then installing the third sealing ring 8 to complete the assembly. Figure 6 Complete the assembly as shown in crimp A.

[0042] Therefore, the utility model effectively overcomes various shortcomings in the prior art and has a high industrial utilization value. The above embodiments are only illustrative of the principles and effects of the utility model, and are not used to limit the utility model. Anyone familiar with this technology can modify or change the above embodiments without violating the spirit and scope of the utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed by the utility model should still be covered by the claims of the utility model.

Claims

1. A gearbox pressure sensor, characterized in that: The gearbox pressure sensor comprises: A housing, wherein an inner cavity and a pressure-sensing channel are provided in the housing, and the pressure-sensing channel is communicated with the inner cavity; A pressure-sensitive core body is arranged in the inner cavity; A circuit board is arranged in the inner cavity, the circuit board comprises a circuit board body and an extension portion extending from one end of the circuit board body, and one end of the circuit board body is electrically connected to the pressure-sensitive core; A connector, one end of which is connected to the housing, and the other end of the circuit board body is electrically connected to the connector; And a plug body is arranged in the inner cavity, one end of the plug body is against the connecting piece, the other end of the plug body is against the extending part, and the extending part is at least partially against the shell.

2. The transmission pressure sensor according to claim 1, characterized in that: The shell has a main body end and a connecting end, one end of the main body end is connected to one end of the connecting end, and the other end of the main body end is connected to the connecting piece.

3. The gearbox pressure sensor according to claim 2, characterized in that: The connecting end has threads on its outer surface.

4. The transmission pressure sensor according to claim 1, characterized in that: The bottom of the inner cavity is provided with a groove, a first sealing ring is arranged in the groove, and the pressure-sensitive core is located on the first sealing ring.

5. The transmission pressure sensor according to claim 1, characterized in that: The circuit board is a flexible circuit board.

6. The transmission pressure sensor according to claim 1, characterized in that: The connecting member includes a connecting member body and a conductive member located in the connecting member body, and the conductive member is connected to the circuit board.

7. The transmission pressure sensor according to claim 6, characterized in that: The connector body is provided with a concave ring at the outer side wall in the inner cavity, and a second sealing ring is provided in the concave ring.

8. The transmission pressure sensor according to claim 6, characterized in that: A slot hole is arranged on the outer side wall of the bottom of the connector body, and the plug body is at least partially located in the slot hole.

9. The transmission pressure sensor according to claim 6, characterized in that: The bottom of the connector body has an accommodating cavity in the inner cavity, and the circuit board body is at least partially located in the accommodating cavity.

10. The transmission pressure sensor according to claim 1, characterized in that: An acute angle is formed between the extension portion and the inner cavity side wall.

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