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, and one end of the circuit board is connected with the pressure sensing core body; the pressing ring is arranged in the inner cavity, at least part of the circuit board is in contact with the pressing ring, the pressing ring comprises a ring body, a plurality of convex parts are arranged on the outer side wall of the ring body, and the convex parts are in contact with the shell; the pressure sensor comprises a shell, a circuit board and a connecting piece, one end of the connecting piece is connected with the shell, the other end of the connecting piece is located outside the shell, the other end of the circuit board is connected with the connecting piece, and the pressure sensor improves product reliability and facilitates automatic production.

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 transmission pressure sensor is installed inside the transmission, and is surrounded by transmission oil and impurities and dust that circulate during long-term driving. The transmission pressure sensor in the existing technology has problems such as poor pressure resistance, sealing and grounding reliability. In addition, there is also the problem of low degree of automated production. Utility Model Content

[0004] The utility model aims to overcome the defects of the prior art and provides a transmission pressure sensor to improve the sealing and durability of the transmission pressure sensor.

[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 includes: a shell, the shell is provided with an inner cavity and a pressure-sensitive channel, the pressure-sensitive channel and the inner cavity are connected; a pressure-sensitive core body is arranged in the inner cavity; a circuit board is arranged in the inner cavity, one end of the circuit board is connected to the pressure-sensitive core body; a pressure ring is arranged in the inner cavity, the circuit board is at least partially in contact with the pressure ring, the pressure ring includes a ring body, and multiple pressure-sensitive channels are arranged on the outer wall of the ring body. a convex portion, the convex portion is in contact with the shell; and a connecting piece, one end of the connecting piece is connected to the shell, the other end of the connecting piece is located outside the shell, and the other end of the circuit board is connected to the connecting piece; the bottom of the inner cavity has a groove, a first sealing ring is arranged in the groove, the pressure-sensitive core is located on the first sealing ring, the connecting piece includes a connecting piece body and a conductive piece located in the connecting piece body, the conductive piece is connected to the circuit board, the connecting piece body is provided with a concave ring at the outer side wall in the inner cavity, and a second sealing ring is arranged in the concave ring.

[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 circuit board is a flexible circuit board.

[0009] In one embodiment, a connecting column is disposed at the bottom of the connecting member body.

[0010] In one embodiment, the ring body of the pressure ring has a column hole and a notch, and the connecting column cooperates with the column hole.

[0011] In one embodiment, a connecting groove is provided on the bottom end surface of the connecting member body in the inner cavity, and one end of the conductive member extends out of the connecting groove.

[0012] The utility model provides a gearbox pressure sensor. Compared with the prior art, the utility model has the following beneficial effects: in order to adapt to the compatibility of the medium in the gearbox and the durability of the sealing ring, the sensor component is grounded through three-point interference fit contact between the metal pressure ring and the metal shell, and the sealing ring is placed inside the sensor to avoid direct contact with the gearbox oil and accelerated aging.

[0013] The metal pressure ring and the shell are in interference fit, and the pressure ring and the connector are pre-assembled through interference fit of the connecting column. The pressure ring structure is non-circular, which makes it easier to assemble the pressure ring into the shell. The adopted metal pressure ring structure increases the pressure-bearing area of ​​the plastic connector body and reduces the risk of creep of the plastic connector body after durability, compared with the connector directly extruding the ceramic pressure-sensitive core. The current structure can also realize automatic welding of flexible circuit boards.

[0014] The sealing surface where the second sealing ring is located in the housing and the contact surface between the housing and the metal pressure ring are separated into two surfaces, so as to avoid damaging the sealing surface where the second sealing ring is located when assembling the pressure ring, thereby affecting the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a schematic structural diagram of the pressure sensor of the utility model.

[0016] Figure 2 Shown is a cross-sectional view of the pressure sensor of the present invention.

[0017] Figure 3 Shown is a schematic diagram of the explosion structure of the pressure sensor of the utility model.

[0018] Figure 4 Shown is a schematic structural diagram of the pressure ring and circuit board of the utility model.

[0019] Figure 5 Shown is a fracture cross-sectional view of the contact point between the protrusion and the shell of the utility model.

[0020] Figure 6Shown is a structural schematic diagram of the pressure sensor of the utility model in the soldering state.

[0021] Numbers in the figure:

[0022] 1-shell, 11-main body end, 12-connection end, A-inner cavity, B-curling edge, 111-groove, 121-thread, 122-pressure sensing channel;

[0023] 2- first sealing ring;

[0024] 3-Pressure-sensitive core;

[0025] 4- Circuit board;

[0026] 5-pressure ring, 51-ring body, 52-convex part, 53-notch, 54-column hole;

[0027] 6-connecting piece, 61-connecting piece body, 62-recessed ring, 63-conducting piece, 64-connecting groove, 65-connecting column;

[0028] 7- second sealing ring;

[0029] 8-The third sealing ring. DETAILED DESCRIPTION

[0030] See also Figures 1 to 6 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.

[0031] like Figure 1 and Figure 3 As shown, the utility model provides a gearbox pressure sensor, the pressure sensor includes a shell 1, the shell 1 is a metal shell 1, the shell 1 has an inner cavity A, the shell 1 includes a main body end 11 and a connecting end 12 connected to the main body end 11, 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 121, the connecting end 12 has a pressure sensing channel 122, the pressure sensing channel 122 is communicated with the inner cavity A, the bottom of the inner cavity A has a groove 111, a first sealing ring 2 is arranged in the groove 111, and the first sealing ring 2 can prevent the medium in the pressure sensing channel 122 from penetrating into the interior of the sensor.

[0032] like Figure 2 and Figure 3As shown, the pressure sensor includes a pressure-sensitive core 3, and the pressure-sensitive core 3 is located in the inner cavity A. The bottom of the pressure-sensitive core 3 is at least partially connected to the pressure-sensitive channel 122. 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 122 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 63.

[0033] like Figure 3 and Figure 6 As shown, the pressure sensor includes a circuit board 4, which can be a flexible circuit board 4. One end of the circuit board 4 can be connected to the pressure-sensitive core 3. The connection can be welding, and the welding can be tin soldering. The structure of the pressure sensor can realize automatic welding of the flexible circuit board 4.

[0034] like Figure 2 and Figure 3 As shown, the pressure sensor includes a pressure ring 5 located on the outside of the circuit board 4, the pressure ring 5 is a metal pressure ring 5, the pressure ring 5 is arranged in the inner cavity A and located on the pressure sensing core 3, specifically, the pressure ring 5 is located between the circuit board 4 and the shell 1, the pressure ring 5 is an open pressure ring 5, the pressure ring 5 includes a ring body 51, the ring body 51 of the pressure ring 5 has a notch 53, one end of the circuit board 4 can be arranged at the notch 53, the outer side wall of the ring body 51 of the pressure ring 5 has a convex portion 52, the convex portion 52 can be an arc-shaped convex portion 52, the convex portion 52 can include three convex portions 52 equidistantly distributed on the outer peripheral wall of the ring body 51.

[0035] like Figure 3 and Figure 5 As shown, the protrusion 52 and the inner wall of the housing 1 can achieve point contact. The ring body 51 of the pressure ring 5 is provided with a column hole 54. The pressure ring 5 and the housing 1 are interference fitted. The circuit board 4 is at least partially in contact with the pressure ring 5, and the sensor can be effectively grounded through the three-point interference fit contact between the pressure ring 5 and the housing 1.

[0036] like Figure 2 and Figure 3As shown, the pressure sensor includes a connector 6, one end of which is connected to the main body end 11 of the shell 1, one end of the connector 6 is located in the inner cavity A, and the other end of the connector 6 is located outside the shell 1, the connector 6 includes a connector body 61 and a conductive member 63 located inside the connector body 61, the conductive member 63 is connected to the other end of the circuit board 4, and the connection can be welding, and the outer side wall of one end of the connector body 61 located in the inner cavity A has a concave ring 62, and a second sealing ring 7 is arranged in the concave ring 62, and the outer side of the second sealing ring 7 is against the side wall of the inner cavity A, which can prevent gearbox oil and dust from entering the inner cavity A.

[0037] like Figure 3 As shown, a connecting column 65 matching the column hole 54 is provided at the bottom of the connecting member body 61 .

[0038] like Figure 2 As shown, the connector body 61 is further provided with a connecting groove 64 on the bottom end face in the inner cavity A, and the connecting groove 64 can provide a soldering point for the circuit board 4 and the conductive member 63. One end of the conductive member 63 extends out of the connecting groove 64 to facilitate welding with the circuit board 4.

[0039] 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.

[0040] The installation of the utility model may include: pre-assembling the pressure-sensitive core 3 with the circuit board 4 and the connector 6, reliably connecting the circuit board 4 and the pressure-sensitive core 3 and the conductive member 63 on the connector 6 together by automatic welding, placing the first sealing ring 2, the pressure-sensitive core 3, the circuit board 4, the pressure ring 5, the connector 6, and the second sealing ring 7 in the inner cavity A of the shell 1 in sequence, and pre-assembling the pressure ring 5 and the connector 6 through interference fit through the column hole 54. At the same time, the structure of the pressure ring 5 is not a full circle, which makes it easier to assemble the pressure ring 5 into the metal shell 1. At the same time, the sealing surface where the second sealing ring 7 is located in the shell 1 and the contact surface with the metal pressure ring 5 in the shell 1 are separated into two surfaces to avoid damaging the sealing surface where the second sealing ring 7 is located when assembling the pressure ring 5, thereby affecting the sealing effect. Finally, the main body end 11 of the shell 1 is curled and connected to the connector 6 through the riveting process of the curling B to complete the assembly, such as Figure 2 Complete the assembly as shown in crimp B.

[0041] 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, and one end of the circuit board is connected to the pressure-sensitive core; A pressure ring is arranged in the inner cavity, the circuit board at least partially contacts the pressure ring, the pressure ring comprises a ring body, a plurality of convex parts are arranged on the outer side wall of the ring body, and the convex parts contact the shell; and a connector, one end of which is connected to the shell, the other end of which is located outside the shell, and the other end of the circuit board is connected to the connector; the bottom of the inner cavity has a groove, a first sealing ring is arranged in the groove, the pressure-sensitive core is located on the first sealing ring, the connector includes a connector body and a conductive member located in the connector body, the conductive member is connected to the circuit board, the connector body has a concave ring on the outer side wall in the inner cavity, and a second sealing ring is arranged in the concave ring.

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 circuit board is a flexible circuit board.

5. The transmission pressure sensor according to claim 1, characterized in that: A connecting column is arranged at the bottom of the connecting piece body.

6. The transmission pressure sensor according to claim 5, characterized in that: The ring body of the pressure ring is provided with a column hole and a notch, and the connecting column is matched with the column hole.

7. The transmission pressure sensor according to claim 1, characterized in that: The connector body is provided with a connecting groove on the bottom end surface in the inner cavity, and one end of the conductive member extends out of the connecting groove.

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