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CN-224202634-U - Miniaturized high-sealing gearbox pressure sensor

CN224202634UCN 224202634 UCN224202634 UCN 224202634UCN-224202634-U

Abstract

The utility model belongs to the technical field of sensors, and particularly relates to a miniaturized high-sealing gearbox pressure sensor which comprises an elastic base, a strain gauge, a shell and a connecting element, wherein the shell comprises an upper shell and a lower shell, the lower shell is fixedly clamped with the upper shell, a first sealing part and a second sealing part are arranged at the connecting part of the lower shell and the upper shell, one end of the connecting element is connected with a circuit board, the other end of the connecting element extends out of the shell, and a third sealing part is arranged between the connecting element and the shell.

Inventors

  • ZHAO XIAODONG
  • ZHANG XUAN

Assignees

  • 敏之捷传感科技(常州)有限公司

Dates

Publication Date
20260505
Application Date
20250621

Claims (10)

  1. 1. A miniaturized high-sealing gearbox pressure sensor is characterized by comprising: An elastic base (1) in which a flow passage (101) for fluid to enter is formed; A strain gauge (2) attached to the elastic base (1); The shell comprises an upper shell (3) and a lower shell (4) connected between the upper shell (3) and the elastic base (1), wherein the lower shell (4) is fixedly clamped with the upper shell (3), a first sealing part (5) is arranged on the outer wall surface of the connecting part of the lower shell and the upper shell, a second sealing part (6) is arranged on the inner wall surface of the connecting part, and the lower shell (4) is fixedly welded with the elastic base (1); A circuit board (7) electrically connected to the strain gauge (2); And a connecting element, one end of which is connected with the circuit board (7), and the other end of which extends out of the housing and a third sealing part (8) is arranged between the connecting element and the housing.
  2. 2. A miniaturized high-sealing gearbox pressure sensor according to claim 1, characterised in that said connection element comprises a terminal (9) and a spring (10) connected between said terminal (9) and a circuit board (7), said terminal (9) being elongated.
  3. 3. The miniaturized high-sealing gearbox pressure sensor according to claim 1, wherein one end, close to the upper shell (3), of the lower shell (4) is inwards bent to form a clamping part (401), the upper shell (3) is concavely formed with a clamping groove (301) for clamping the clamping part (401), and the first sealing part (5), the second sealing part (6) and the third sealing part (8) are all glued and sealed.
  4. 4. A miniaturized high-sealing gearbox pressure sensor according to claim 2 is characterized in that said sensor further comprises a skeleton (11), said skeleton (11) is formed with a lower mounting cavity (1101), the upper housing (3) is formed with an upper mounting cavity (302), said lower mounting cavity (1101) and upper mounting cavity (302) enclosing a spring mounting cavity for mounting and defining said spring (10) inside.
  5. 5. A miniaturized high-sealing gearbox pressure sensor according to claim 1 is characterised in that said sensor further comprises a support ring (12) for supporting a circuit board (7) to separate it from said elastic base (1).
  6. 6. A miniaturized high-sealing gearbox pressure sensor according to claim 5 is characterized in that one end of the supporting ring (12) close to the circuit board (7) is bent to form a supporting part (1201), and the other end is bent to form a fixing part (1202) for welding and fixing with the elastic base (1).
  7. 7. A miniaturized high-sealing gearbox pressure sensor according to claim 1 is characterized in that the flow channel (101) extends along the axial direction of the elastic base (1) and is provided with an open end (102) penetrating through one end face of the flow channel, the other end is a closed end (103), and the strain gauge (2) is attached to the closed end (103).
  8. 8. A miniaturized high-sealing transmission pressure sensor according to claim 1, characterized in that the outer peripheral wall of the elastic base (1) is recessed with a blocking portion (104) for blocking the mounting stress from the mounting surface.
  9. 9. The miniaturized high-sealing gearbox pressure sensor according to claim 2, wherein the springs (10) and the terminals (9) are provided with a plurality of springs and are circumferentially distributed at intervals, and one end, close to the corresponding spring (10), of each terminal (9) is bent towards a direction away from the other terminals (9) to form a bending part (901) for connecting the springs (10).
  10. 10. The miniaturized high-sealing gearbox pressure sensor as set forth in claim 4, wherein the skeleton (11) is assembled with the shell in an interference manner, and the outer peripheral wall of the skeleton (11) and the inner peripheral wall of the shell are respectively provided with a positioning part (1102) in a protruding manner and a positioning groove (403) for the positioning part (1102) to be clamped in a recessed manner.

Description

Miniaturized high-sealing gearbox pressure sensor Technical Field The utility model belongs to the technical field of sensors, and particularly relates to a miniaturized high-sealing gearbox pressure sensor. Background With the rapid development of the automobile transmission system in the high integration and intelligent directions, the performance of the transmission pressure sensor serving as a key sensing element of the hydraulic control system directly influences the gear shifting smoothness, the clutch control precision and the system reliability. While current main flow pressure sensors can meet basic pressure monitoring requirements, there are a number of shortcomings in dealing with the increasingly stringent technical requirements of modern gearboxes. The traditional pressure sensor generally adopts a multi-layer stacking or split type architecture, so that the overall size is larger, and the installation space requirement of the new generation of gear box compactness is difficult to adapt. The structural complexity not only increases the manufacturing cost, but also introduces more potential failure points, such as leakage risk caused by increased sealing interfaces, fatigue fracture of welding points and the like. In terms of performance parameters, the conventional sensor scheme is difficult to consider various key indexes. The simplified design employed in pursuit of miniaturization generally sacrifices measurement accuracy or temperature stability. From the application view, with the popularization of new technologies such as 48V light hybrid systems, multi-gear gearboxes and the like, stricter requirements are put on the pressure sensor. On the one hand, the volume needs to be further reduced to adapt to more compact installation space, and on the other hand, high measurement precision in a wide temperature range needs to be ensured, meanwhile, excellent vibration resistance, impact resistance and sealing performance are achieved, and the key difficulty of technological breakthrough is that how to ensure stable performance while simplifying the structure. Disclosure of utility model The utility model aims to solve the technical problems that the whole size of a gearbox pressure sensor in the prior art is large, the compact installation space requirement of the gearbox cannot be met, the sealing performance is poor, and the gearbox pressure sensor cannot be met in an oil immersion environment for a long time, and provides a miniaturized high-sealing gearbox pressure sensor and a pressure sensor thereof. In order to solve the technical problems, the utility model adopts the following technical scheme that the miniaturized high-sealing gearbox pressure sensor comprises: An elastic base, in which a flow channel for fluid to enter is formed; the strain gauge is attached to the elastic base; The shell comprises an upper shell and a lower shell connected between the upper shell and the elastic base, wherein the lower shell is fixedly clamped with the upper shell, a first sealing part is arranged on the outer wall surface of the connecting part of the lower shell and the upper shell, a second sealing part is arranged on the inner wall surface, and the lower shell and the elastic base are fixedly welded; the circuit board is electrically connected with the strain gauge; And one end of the connecting element is connected with the circuit board, and the other end of the connecting element extends out of the shell and a third sealing part is arranged between the connecting element and the shell. Further, the connecting element comprises a terminal and a spring connected between the terminal and the circuit board, and the terminal is in a strip shape. Further, one end of the lower shell, which is close to the upper shell, is inwards bent to form a clamping part, the upper shell is concavely formed with a clamping groove for clamping in the clamping part, and the first sealing part, the second sealing part and the third sealing part are all glued and sealed. Further, the sensor further comprises a skeleton, wherein the skeleton is provided with a lower mounting cavity, the upper shell is provided with an upper mounting cavity, and the lower mounting cavity and the upper mounting cavity are enclosed to form a spring mounting cavity for mounting the spring and limiting the spring inside. Further, the sensor further includes a support ring for supporting the circuit board to be spaced apart from the resilient base. Further, one end of the supporting ring, which is close to the circuit board, is bent to form a supporting part, and the other end of the supporting ring is bent to form a fixing part welded and fixed with the elastic base. Furthermore, the runner extends along the axial direction of the elastic base and penetrates through the end face of one end of the runner to form an open end, the other end of the runner is a closed end, and the strain gauge is attached to the closed end. Further, the elastic