Active air suspension system shock absorber hydraulic pump pressure sensor

Abstract

This utility model relates to a pressure sensor for a shock-absorbing hydraulic pump in an active air suspension system, comprising a sensing element, a support ring, and a first PCBA circuit board. The first PCBA circuit board is fixed to the upper end of the support ring. The upper part of the sensing element extends into the support ring, and a silicon-based strain gauge electrically connected to the first PCBA circuit board is mounted on the upper surface of the sensing element. A conditioning chip is mounted on the first PCBA circuit board. A spring frame is located above the support ring, with a second PCBA circuit board snapped onto the upper end of the spring frame. The lower end of the spring frame is snapped into the first PCBA circuit board. A spring electrically connecting the first and second PCBA circuit boards is located inside the spring frame. A connector is mounted on the upper surface of the second PCBA circuit board. This utility model, by setting a new conditioning chip with a faster response time on the first PCBA circuit board, not only meets the rapid response requirements of the active air suspension system but also satisfies the customer's special structural assembly requirements in terms of structural design.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to a pressure sensor for a shock-absorbing hydraulic pump in an active air suspension system. Background Technology

[0002] Active air suspension is an advanced automotive suspension system that uses hydraulic control technology to actively adjust the distance and angle between the wheels and the vehicle body to adapt to different road conditions and driving needs. This suspension system consists of several key components, including air springs, air supply units, shock absorber hydraulic pumps, hydraulic cylinders, sensors, and control units. Through the coordinated work of these components, precise control of vehicle height and effective isolation of road vibrations are achieved.

[0003] Active air suspension systems can sense changes in road surface and driving intentions in a very short time and make corresponding adjustments quickly. This rapid response capability greatly improves the vehicle's handling and stability, allowing drivers to cope with various complex road conditions more easily. Therefore, a rapid response is required, which places higher demands on the response time of pressure sensors.

[0004] Existing pressure sensors used in shock-absorbing hydraulic pumps are mainly from industrial or braking applications, lacking an independent design structure. Industrial pressure sensors often have response times that fail to meet customer requirements, while traditional braking pressure sensors cannot meet the specific structural assembly needs of customers. Therefore, to address these issues, it is necessary to provide a hydraulic shock-absorbing pump pressure sensor that is compatible with both. Summary of the Invention

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides an active air suspension system shock absorber hydraulic pump pressure sensor that can achieve rapid response.

[0006] The technical solution adopted by this utility model to solve its technical problem is: an active air suspension system shock absorber hydraulic pump pressure sensor, including a sensing element, a support ring, and a first PCBA circuit board. The first PCBA circuit board is fixed to the upper end of the support ring. The upper part of the sensing element extends into the support ring. A silicon-based strain gauge electrically connected to the first PCBA circuit board is provided on the upper end face of the sensing element. A conditioning chip is provided on the first PCBA circuit board. A spring frame is provided above the support ring. A second PCBA circuit board is snapped onto the upper end of the spring frame. The lower end of the spring frame is snapped onto the first PCBA circuit board. A spring electrically connecting the first PCBA circuit board and the second PCBA circuit board is provided inside the spring frame. A connector is installed on the upper end face of the second PCBA circuit board.

[0007] Specifically, the sensing element includes a metal elastomer, which has a pressure cavity with a lower opening for introducing an external pressure medium. A silicon-based strain gauge is fixed to the upper surface of the metal elastomer by sintering with glass glue. A first welding boss and a second welding boss are respectively provided on the outer side wall of the metal elastomer.

[0008] Furthermore, the upper and lower end faces of the spring frame are respectively provided with positioning posts. The positioning post on the lower end face of the spring frame is engaged with the groove on the outer periphery of the first PCBA circuit board, and the positioning post on the upper end face of the spring frame is engaged with the groove on the outer periphery of the second PCBA circuit board. The spring frame is provided with two receiving cavities for accommodating the spring.

[0009] Furthermore, the sensing element is equipped with a housing, and the support ring for assembling the first PCBA circuit board and the sensing element is installed inside the housing cavity. The spring frame is located inside the housing cavity above the first PCBA circuit board, and the second PCBA circuit board is located on the bottom surface of the through hole opened on the upper end face of the housing.

[0010] Furthermore, the lower end of the outer shell is circumferentially pressed against the first welding boss and welded to the first welding boss, and the lower end of the support ring is circumferentially pressed against the second welding boss and welded to the second welding boss.

[0011] Furthermore, the through-hole on the upper surface of the outer casing is embedded with sealant covering the second PCBA circuit board.

[0012] Preferably, the first PCBA circuit board is electrically connected to the silicon-based strain gauge via five aluminum wires.

[0013] Furthermore, an O-ring is embedded on the lower outer peripheral surface of the sensing element.

[0014] The beneficial effects of this utility model are: by setting a brand-new conditioning chip with a faster response time on the first PCBA circuit board, this utility model not only meets the fast response requirements of the active air suspension system, but also meets the special structural assembly requirements of customers in terms of structural design. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the external structure of this utility model.

[0017] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0018] Figure 3 This is a three-dimensional structural schematic diagram of the sensing element described in this utility model.

[0019] Figure 4 This is a schematic diagram of the installation of the first PCBA circuit board and the support ring of this utility model.

[0020] Figure 5 This is a schematic diagram of the installation of the conditioning chip described in this utility model.

[0021] Figure 6 This is a three-dimensional structural schematic diagram of the spring skeleton described in this utility model.

[0022] Figure 7 This is a cross-sectional structural schematic diagram of the spring skeleton described in this utility model.

[0023] In the figure: 1. Sensing element, 101. Metal elastomer, 102. Pressure chamber, 103. First welding boss, 104. Second welding boss, 2. Support ring, 3. First PCBA circuit board, 4. Silicon-based strain gauge, 5. Conditioning chip, 6. Spring frame, 601. Positioning post, 602. Receiving cavity, 7. Second PCBA circuit board, 8. Spring, 9. Connector, 10. Housing, 11. Sealant, 12. Aluminum wire, 13. O-ring. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0025] like Figures 1-5 As shown, an active air suspension system shock absorber hydraulic pump pressure sensor has a housing 10, a sensing element 1, a support ring 2, and a first PCBA circuit board 3. The housing 10 has an inner cavity with an opening at the lower end. A through hole is opened on the upper surface of the housing 10 located at the upper end of the inner cavity. The first PCBA circuit board 3 is fixed to the upper end of the support ring 2. The upper part of the sensing element 1 extends into the support ring 2. A silicon-based strain gauge 4 is provided on the upper surface of the sensing element 1 and is electrically connected to the first PCBA circuit board 3 through five aluminum wires 12. A conditioning chip 5 is provided on the first PCBA circuit board 3. The support ring 2, after assembling the first PCBA circuit board 3 and the sensing element 1, is installed into the inner cavity of the housing 10.

[0026] See Figure 3The sensing element 1 includes a metal elastomer 101, which has a pressure chamber 102 with an opening at the lower end for introducing an external pressure medium. A metal thin film is fixed on the top of the metal elastomer 101. A silicon-based strain gauge 4 is fixed to the metal thin film by sintering with glass glue. The pressure fluid enters the pressure chamber 102 from the opening at the bottom of the sensing element 1, causing the bottom wall of the pressure chamber 102 to be deformed by pressure. This causes the metal thin film on the top of the metal elastomer 101 to deform simultaneously. After sensing the deformation of the metal thin film, the silicon-based strain gauge 4 transmits the pressure signal to the first PCBA circuit board 3.

[0027] The outer wall of the support ring 2 is spaced apart from the inner wall of the housing 10, and the outer periphery of the sensing element 1 extending into the support ring 2 is spaced apart from the inner wall of the support ring 2. This effectively prevents the housing 10 from squeezing the support ring 2 under stress, thus preventing damage to the sensing element 1 and extending the service life of the sensor.

[0028] A first welding boss 103 and a second welding boss 104 are respectively provided on the outer wall of the metal elastomer 101. The lower end of the outer shell 10 is circumferentially pressed against the first welding boss 103 and welded to the first welding boss 103. The lower end of the support ring 2 is circumferentially pressed against the second welding boss 104 and welded to the second welding boss 104.

[0029] A spring frame 6 is provided inside the outer shell 10 located above the support ring 2. A second PCBA circuit board 7 is provided at the upper end of the spring frame 6. The second PCBA circuit board 7 is attached to the bottom surface of the through hole on the upper end face of the outer shell 10; Figure 6 , Figure 7 As shown, the upper and lower end faces of the spring frame 6 are respectively provided with positioning posts 601. The positioning post 601 on the lower end face of the spring frame 6 is engaged with the groove on the outer periphery of the first PCBA circuit board 3, and the positioning post 601 on the upper end face of the spring frame 6 is engaged with the groove on the outer periphery of the second PCBA circuit board 7.

[0030] The spring frame 6 has two accommodating cavities 602 spaced apart from each other. The accommodating cavities 602 are equipped with springs 8 that electrically connect the first PCBA circuit board 3 and the second PCBA circuit board 7. A connector 9 is installed on the upper surface of the second PCBA circuit board 7.

[0031] To improve the sealing effect, a sealant 11 covering the second PCBA circuit board 7 is embedded in the through hole on the upper surface of the housing 10, and the sealant 11 covers the bottom of the connector 9.

[0032] In addition, an O-ring 13 is embedded on the lower outer peripheral surface of the sensing element 1, which can provide an oil-proof sealing function when the customer uses it.

[0033] This invention, by setting a new conditioning chip 5 with a faster response time on the first PCBA circuit board 3, not only meets the fast response requirements of the active air suspension system, but also meets the customer's special structural assembly requirements in terms of structural design.

[0034] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A pressure sensor for a shock-absorbing hydraulic pump in an active air suspension system, comprising a sensing element (1), a support ring (2), and a first PCBA circuit board (3), wherein the first PCBA circuit board (3) is fixed to the upper end of the support ring (2), the upper part of the sensing element (1) extends into the support ring (2), and a silicon-based strain gauge (4) electrically connected to the first PCBA circuit board (3) is provided on the upper surface of the sensing element (1). The sensor is characterized by: The first PCBA circuit board (3) is provided with a conditioning chip (5), and a spring frame (6) is provided above the support ring (2). The upper end of the spring frame (6) is snapped onto the second PCBA circuit board (7), and the lower end of the spring frame (6) is snapped onto the first PCBA circuit board (3). The spring frame (6) is provided with a spring (8) that electrically connects the first PCBA circuit board (3) and the second PCBA circuit board (7). A connector (9) is installed on the upper surface of the second PCBA circuit board (7).

2. The shock-absorbing hydraulic pump pressure sensor as described in claim 1, characterized in that: The sensing element (1) includes a metal elastomer (101), which has a pressure chamber (102) with an opening at the lower end for introducing an external pressure medium. A silicon-based strain gauge (4) is fixed to the upper end face of the metal elastomer (101) by sintering with glass glue. A first welding boss (103) and a second welding boss (104) are respectively provided on the outer side wall of the metal elastomer (101).

3. The shock-absorbing hydraulic pump pressure sensor as described in claim 2, characterized in that: The spring frame (6) is provided with positioning posts (601) on the upper and lower end faces respectively. The positioning post (601) on the lower end face of the spring frame (6) is engaged with the groove on the outer periphery of the first PCBA circuit board (3). The positioning post (601) on the upper end face of the spring frame (6) is engaged with the groove on the outer periphery of the second PCBA circuit board (7). The spring frame (6) is provided with two receiving cavities (602) for accommodating springs (8).

4. The shock-absorbing hydraulic pump pressure sensor as described in claim 3, characterized in that: The sensing element (1) is mounted with a housing (10). The support ring (2) of the first PCBA circuit board (3) and the sensing element (1) is installed in the inner cavity of the housing (10). The spring frame (6) is located in the inner cavity of the housing (10) above the first PCBA circuit board (3). The second PCBA circuit board (7) is located on the bottom surface of the through hole opened on the upper end face of the housing (10).

5. The shock-absorbing hydraulic pump pressure sensor as described in claim 4, characterized in that: The lower end of the outer shell (10) is circumferentially pressed against the first welding boss (103) and welded to the first welding boss (103). The lower end of the support ring (2) is circumferentially pressed against the second welding boss (104) and welded to the second welding boss (104).

6. The shock-absorbing hydraulic pump pressure sensor as described in claim 4, characterized in that: The upper end face of the outer shell (10) is fitted with a sealant (11) covering the second PCBA circuit board (7).

7. The shock-absorbing hydraulic pump pressure sensor as described in claim 1, characterized in that: The first PCBA circuit board (3) is electrically connected to the silicon-based strain gauge (4) via five aluminum wires (12).

8. The shock-absorbing hydraulic pump pressure sensor as described in claim 1, characterized in that: The sensing element (1) has an O-ring (13) embedded on its lower outer peripheral surface.

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