Automobile brake boosting vacuum degree sensor

Abstract

The utility model discloses an automobile brake boosting vacuum degree sensor which comprises a valve body with a cavity inside and a sensor assembly arranged at the top of the valve body, an air inlet nozzle and an air outlet nozzle are arranged at the bottom and the side portion of the valve body respectively, and the sensor assembly comprises a sensor shell and a pressure sensing assembly arranged in the sensor shell. The sensor is characterized in that the sensor shell and the valve body are of an integrated structure; a cavity is formed in the top of the sensor shell, a sealing cover for sealing the top of the cavity is installed on the top of the sensor shell, and the pressure sensing assembly is installed in the cavity; a cavity is arranged in the cavity, a through hole communicated with the cavity is formed in the bottom of the cavity, the pressure sensing assembly is installed on the bottom face of the cavity, the detection end of the pressure sensing assembly is arranged right opposite to the through hole, and the pressure sensing assembly is connected with the outer side of the top of the through hole in a sealed mode. According to the utility model, the assembly convenience is improved, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to a sensor, in particular to an automotive brake assist vacuum sensor, which is mainly applied to new energy vehicles. Background Art

[0002] The vacuum booster can provide additional assistance during braking through the pressure difference on both sides of the air chamber diaphragm. The low-pressure chamber of the vacuum booster needs to monitor its vacuum degree to ensure effective braking.

[0003] An existing automotive brake assist vacuum sensor, as shown in the appendix Figure 1 includes a valve body 101 and a sensor body 102. The sensor body is connected to the valve body through a buckle 103, and the cover plate 104 on the top of the sensor body 102 is also connected to the sensor body through a buckle. In this structure, there are the following deficiencies:

[0004] 1. There are relatively more components, and the main body is made of plastic, which requires injection molding using an injection mold. Therefore, the more components there are, the more injection molds are needed, and the cost is relatively higher.

[0005] 2. There are more components, so there are also more production and assembly processes. At the same time, due to the large number of components, higher tolerance requirements are needed for each component during assembly, resulting in relatively high precision requirements for each component, which further leads to higher injection mold costs and is also prone to problems of unqualified assembly during assembly, and the assembly requirements are relatively high.

[0006] 3. Due to the large number of components, the design requirements are higher, the production cost and assembly difficulty are high, and the structure is more complex.

[0007] 4. For the parts with a buckle structure, the design difficulty of the mold is high, the mold is more complex, and the mold opening cost is higher. Summary of the Invention

[0008] The purpose of the utility model is to provide an automotive brake assist vacuum sensor, which can simplify the assembly process and reduce costs by using this structure.

[0009] To achieve the above purpose, the technical solution adopted by the utility model is: an automotive brake assist vacuum sensor, including a valve body with a chamber inside and a sensor assembly arranged on the top of the valve body. An air inlet nozzle and an air outlet nozzle are respectively arranged at the bottom and side of the valve body. The sensor assembly includes a sensor housing and a pressure sensing assembly arranged inside the sensor housing. The sensor housing and the valve body are of an integral structure;

[0010] A cavity is provided at the top of the sensor housing, and a sealing cover for sealing the top of the cavity is installed on the top of the sensor housing. The pressure sensing assembly is installed in the cavity.

[0011] A through hole communicating with the chamber is provided at the bottom of the cavity. The pressure sensing assembly is installed on the bottom surface of the cavity. The detection end of the pressure sensing assembly faces the through hole, and the pressure sensing assembly is hermetically connected to the outer side of the top of the through hole, so that the top of the through hole is not communicated with the cavity.

[0012] In the above technical solution, a first installation groove is provided on the bottom surface of the cavity. The first installation groove is in a ring structure or a frame structure. The first installation groove is provided outside the through hole. A first sealing member is provided in the first installation groove, and the top surface of the first sealing member abuts against the bottom surface of the pressure sensing assembly.

[0013] In the above technical solution, the first sealing member is sealing glue. The sealing glue fills the first installation groove, and the top surface of the sealing glue abuts against the bottom surface of the pressure sensing assembly.

[0014] Or, the first sealing member is a sealing ring. The sealing ring is provided in the first installation groove, and the top surface of the sealing ring abuts against the bottom surface of the pressure sensing assembly.

[0015] In the above technical solution, a second installation groove is provided on the top of the sensor housing. The second installation groove is in a ring structure or a frame structure. The second installation groove is provided outside the cavity. An extension frame extending downward is provided at the bottom outer edge of the sealing cover. The extension frame faces the second installation groove.

[0016] Sealing glue is provided in the second installation groove. The extension frame is inserted into the second installation groove and is hermetically limited in the second installation groove by the sealing glue.

[0017] In the above technical solution, a ventilation hole communicating with the cavity is provided on the side wall of the sensor housing, and a waterproof breathable membrane is installed in the cavity inside the ventilation hole.

[0018] In the above technical solution, the ventilation hole is provided at the bottom of the sensor housing and is provided beside the valve body.

[0019] In the above technical solution, an insertion interface is provided on one side of the sensor housing. At least one insertion pin is further provided in the sensor housing. One end of the insertion pin is inserted into the insertion interface, and the other end of the insertion pin is arranged in the cavity.

[0020] The pressure sensing assembly is electrically connected to the insertion pin in the cavity.

[0021] In the above technical solution, the valve body includes a valve seat and an air outlet nozzle tube. The chamber is arranged inside the valve seat. The chamber communicates with the bottom of the valve seat. The sensor housing is installed on the top surface of the valve seat, and the sensor housing and the valve seat are of an integral structure;

[0022] The air inlet nozzle is arranged at the bottom of the valve seat. A valve tube is provided on the side wall of the valve seat. The inner end of the air outlet nozzle tube is connected to the valve tube, and the air outlet nozzle is arranged at the outer end of the air outlet nozzle tube.

[0023] In the above technical solution, a positioning protrusion is provided on the outer wall of the valve seat, and the positioning protrusion is coaxially arranged inside the valve tube;

[0024] A plurality of air outlet holes are annularly arranged on the outer wall of the valve seat outside the positioning protrusion. The inner ends of the air outlet holes communicate with the chamber, and the air outlet holes are arranged opposite to the valve tube;

[0025] An outer positioning cylinder is provided at the outer edge of the inner end of the air outlet nozzle tube, and the outer positioning cylinder is sleeved on the outer surface of the valve tube;

[0026] A diaphragm is sleeved on the positioning protrusion, and the inner end face of the diaphragm abuts against a plurality of the air outlet holes;

[0027] A positioning member is further provided at the inner end of the air outlet nozzle tube, and the positioning member abuts against the outer end face of the diaphragm.

[0028] In the above technical solution, a concave arc surface is provided on the outer surface of the valve seat at the outer edge of the positioning protrusion. The outer ends of the air outlet holes are arranged on the arc surface, and the inner end face of the diaphragm abuts against the arc surface;

[0029] The positioning member includes an inner positioning cylinder and a plurality of connecting plates. The inner end of the inner positioning cylinder is sleeved on the positioning protrusion, and the inner end of the inner positioning cylinder abuts against the outer end face at the center of the diaphragm. The plurality of connecting plates are annularly arranged on the outer surface of the outer end of the inner positioning cylinder, and the outer ends of the connecting plates are connected to the inner wall of the air outlet nozzle tube.

[0030] Due to the application of the above technical solution, the present utility model has the following advantages compared with the prior art:

[0031] 1. In the present utility model, the valve body and the sensor housing are of an integral structure. In this way, the number of parts of the product can be reduced, thereby reducing the assembly process, lowering the assembly difficulty. At the same time, the number of manufacturing molds can also be reduced, and the production cost can be lowered;

[0032] 2. In the present utility model, due to the reduction of the number of parts, the design cost can be reduced, the structure can be made simpler, the design cost can be made lower, and the cost can also be made lower;

[0033] 3. In the present utility model, the sealing cover is hermetically connected to the sensor housing by a sealant cartridge, with good sealing effect. Moreover, the structure of the sealing cover is simpler, and there is no need to use a sealing ring, further reducing the number of components and facilitating quick and convenient assembly.

[0034] 4. The present utility model is also provided with a vent hole and a waterproof breathable film, which play a role in maintaining the relative pressure and ensuring the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic structural view in the background art;

[0036] Figure 2 is a schematic structural view in the first embodiment of the present utility model;

[0037] Figure 3 is an exploded view of the first embodiment of the present utility model;

[0038] Figure 4 is Figure 2 a sectional structural view from one perspective in

[0039] Figure 5 is Figure 4 a partial enlarged view in

[0040] Figure 6 is Figure 2 a sectional structural view from another perspective in

[0041] Figure 7 is Figure 6 a partial enlarged view in

[0042] Figure 8 is a schematic structural view of the sealing cover in the first embodiment of the present utility model;

[0043] Figure 9 is a schematic structural view of the air outlet nozzle tube in the first embodiment of the present utility model;

[0044] Figure 10 is a schematic structural view of the sensor housing and the valve seat in the first embodiment of the present utility model;

[0045] Figure 11 is Figure 10 a structural view from another perspective in

[0046] Wherein: 1. Chamber; 2. Valve body; 3. Sensor assembly; 4. Air inlet nozzle; 5. Air outlet nozzle; 6. Sensor housing; 7. Pressure sensing assembly; 8. Cavity; 9. Sealing cover; 10. Through hole; 11. PCB board; 12. Chip; 13. First mounting groove; 14. First relief cavity; 15. Protrusion; 16. Second mounting groove; 17. Extension frame; 18. Vent hole; 19. Waterproof and breathable membrane; 20. Plug interface; 21. Pin; 22. Valve seat; 23. Air outlet nozzle pipe; 24. Valve pipe; 25. Positioning protrusion; 26. Air outlet hole; 27. Outer positioning cylinder; 28. Diaphragm; 29. Arc surface; 30. Inner positioning cylinder; 31. Connecting plate; 101. Valve body; 102. Sensor body; 103. Buckle; 104. Cover plate. Detailed implementation mode

[0047] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0048] Embodiment 1: Refer to Figures 2 to 11 As shown, an automotive brake booster vacuum sensor includes a valve body 2 with a chamber 1 inside and a sensor assembly 3 arranged on the top of the valve body 2. An air inlet nozzle 4 and an air outlet nozzle 5 are respectively arranged at the bottom and side of the valve body 2. The sensor assembly 3 includes a sensor housing 6 and a pressure sensing assembly 7 arranged inside the sensor housing 6. The sensor housing 6 and the valve body 2 are of an integral structure;

[0049] A cavity 8 is arranged at the top of the sensor housing 6. A sealing cover 9 that seals the top of the cavity 8 is installed on the top of the sensor housing 6. The pressure sensing assembly 7 is installed inside the cavity 8;

[0050] A through hole 10 communicating with the chamber 1 is arranged at the bottom of the cavity 8. The pressure sensing assembly 7 is installed on the bottom surface of the cavity 8. The detection end of the pressure sensing assembly 7 faces the through hole 10, and the pressure sensing assembly 7 is hermetically connected to the outside of the top of the through hole 10, so that the top of the through hole 10 is not communicated with the cavity 8.

[0051] In the present utility model, the air inlet is connected to the negative pressure chamber, and the air outlet is connected to the negative pressure source, which is used for vacuum detection of the braking system of new energy vehicles. During use, the negative pressure source generates negative pressure, which is transmitted to the negative pressure chamber through the air outlet nozzle and the air inlet nozzle, so that the negative pressure chamber and the chamber of the valve body are also basically in a negative pressure or vacuum state. During this process, since the through hole is connected to the chamber, the negative pressure will also give negative pressure to the through hole, and the detection end of the pressure sensing component will face the through hole directly, and the pressure sensing component is hermetically connected to the outer edge at the top of the through hole. Therefore, the through hole is equivalent to a blind hole structure with an open bottom, and the negative pressure will also be transmitted to the detection end of the pressure sensing component, and the vacuum degree of the chamber is detected through the detection end of the pressure sensing component, so as to realize the detection of the vacuum degree of the vehicle braking assistance. In the present utility model, the sensor housing and the valve body are of an integral structure, which adopts an integrally injection-molded structure. Compared with the previous method of snap connection, the number of parts is less, there is no need to design a snap structure, the design difficulty of the mold is lower, the mold can be simpler, and the cost of the mold and the manufacturing cost of the product can be lower. At the same time, when assembling the sensor, the assembly process is less and the assembly difficulty is lower.

[0052] Among them, in this embodiment, the pressure sensing component includes a PCB board 11 and a chip 12 (detection chip) mounted on the PCB board. The chip is a pressure chip or a gauge pressure chip, or other chips capable of detecting pressure. The PCB board is directly mounted on the bottom of the cavity, the chip is mounted on the PCB board, and the detection end of the chip faces the through hole directly. At the same time, in order to ensure the detection accuracy and prevent the negative pressure from being directly transmitted into the cavity during vacuum pumping, therefore, a sealed connection is made between the PCB board and the bottom surface of the cavity. This seal is outside the through hole and is used to seal the outside of the connection between the through hole and the PCB board, so that when negative pressure is generated in the cavity, when the negative pressure is transmitted to the through hole, it can only be detected by the detection end of the chip, and the negative pressure will not be transmitted into the cavity to ensure the detection accuracy.

[0053] See Figures 3 to 5 As shown in FIGS. 8 and 10, a first mounting groove 13 is provided on the bottom surface of the cavity 8. The first mounting groove 13 is of an annular structure or a frame structure. The first mounting groove 13 is arranged outside the through hole 10. A first sealing member (not shown in the figure) is provided in the first mounting groove 13, and the top surface of the first sealing member abuts against the bottom surface of the pressure sensing component 7.

[0054] In this embodiment, the first mounting groove is of a frame structure. The bottom of the first sealing member is mounted in the first mounting groove, and the top surface of the first sealing member abuts against the bottom surface of the pressure sensing component. Among them, the bottom surface of the first sealing member abuts against the bottom surface of the PCB board, which is used to seal the connection between the through hole and the pressure sensing component to ensure the vacuum degree of the chamber during use.

[0055] In the present utility model, the first seal has two structures. The first one: the first seal is a sealant, and the sealant fills the first installation groove, and the top surface of the sealant abuts against the bottom surface of the pressure sensing component;

[0056] The second one: the first seal is a sealing ring, and the sealing ring is arranged in the first installation groove, and the top surface of the sealing ring abuts against the bottom surface of the pressure sensing component.

[0057] In this embodiment, the first seal adopts the first structure, that is, the first seal is a sealant, which can not only ensure the sealing effect, but also play a role in bonding and fixing the pressure sensing component and the bottom surface of the cavity. In this way, the pressure sensing component does not need to use other parts to fix it in the cavity, improving the convenience of assembly.

[0058] In this embodiment, a first relief cavity 14 is provided at the bottom of the cavity 8. The through hole 10 is arranged in the middle of the bottom surface of the first relief cavity 14. The first installation groove is arranged on the bottom surface of the first relief cavity, and the first installation groove is arranged between the through hole and the inner surface of the first relief cavity. A sunken convex part 15 is provided at the bottom of the pressure sensing component 7, and the sunken convex part matches the first relief cavity. Therefore, when assembling the pressure sensing component and the sensor housing, first apply sealant in the first installation groove, and then align the convex part of the pressure sensing component with the first relief cavity, and then press down the pressure sensing component to complete the rapid assembly of the pressure sensing component and the sensor housing, with high assembly accuracy and fast efficiency. Through the matching and correspondence of the convex part and the first relief cavity, the installation alignment of the pressure sensing component can be realized, and the front-back, left-right movement limit of the pressure sensing component can be carried out. Then, by using the bonding of the sealant, the up-down movement limit of the pressure sensing component is realized, ensuring the convenience and firmness of the assembly of the pressure sensing component and the sensor housing.

[0059] See Figures 3 to 5 As shown in FIGS. 10 and 11, a second installation groove 16 is provided at the top of the sensor housing 6. The second installation groove 16 is of a ring structure or a frame structure. The second installation groove 16 is arranged outside the cavity 8. An extension frame 17 extending downward is provided at the outer edge of the bottom of the sealing cover 9, and the extension frame 17 is arranged opposite to the second installation groove 16;

[0060] Sealant (not shown in the figure) is provided in the second installation groove 16. The extension frame 17 is inserted into the second installation groove 16 and is sealed and limited in the second installation groove 16 by the sealant.

[0061] In the present utility model, the sealing cover can be directly made of a plastic plate slightly larger than the cavity. Then, when connecting the sealing cover and the sensor housing, sealant is directly applied to the top surface of the sensor housing outside the cavity. Next, the sealing cover is directly placed on the top of the cavity, and the outer edge of the bottom of the sealing cover abuts against the sealant, thereby achieving the sealed connection between the sealing cover and the sensor housing. In this method, the sealing cover protrudes outside the top of the sensor housing, and the edge of the sealing cover is exposed. If an external force acts on the edge of the sealing cover, it is easy to cause the separation between the sealing cover and the sealant, resulting in the insecure installation of the sealing cover.

[0062] Therefore, in this embodiment, a second installation groove is provided at the top of the sensor housing, the cavity is located inside the second installation groove, and an extension frame is provided at the outer edge of the bottom of the sealing cover facing the second installation groove. The sealant is directly applied to the second installation groove, and then the extension frame is aligned with the second installation groove and inserted into the second installation groove, so that the bottom surface of the sealing cover abuts against the top surface of the sensor housing at the inner end of the second installation groove, sealing the top of the cavity. The extension frame and the sensor housing are connected by the sealant to achieve the connection between the sealing cover and the sensor housing. Alternatively, the width of the second installation groove is slightly larger than the wall thickness of the extension frame. After the extension frame is inserted into the second installation groove, the sealant is squeezed or applied into the gap between the inner wall of the second installation groove and the outer surface of the extension frame to block the gap, which can not only connect the sensor housing and the sealing cover but also play a sealing role. In this method, the top of the sealing cover may not protrude outside the top of the sensor housing (a frame-shaped member is formed between the top surface of the sensor housing between the second installation groove and the cavity, and the height from the top surface of the frame-shaped member to the top surface of the sensor housing can be greater than or equal to the thickness of the sealing cover). In this way, there is no position on the side of the cover plate where force is applied, or it will be limited by the second installation groove after being stressed, thereby reducing the probability of the sealing cover detaching from the sensor housing and ensuring the strength and stability of the connection between the sealing cover and the sensor housing.

[0063] See Figure 3 、 10 As shown in, a ventilation hole 18 communicating with the cavity is provided on the side wall of the sensor housing 6, and a waterproof breathable film 19 is installed in the cavity 8 inside the ventilation hole 18.

[0064] Among them, the chips in the pressure sensing component are generally divided into two types. One works under absolute pressure conditions, and the other works under relative pressure conditions. In this embodiment, the chip in the pressure sensing component works under relative pressure conditions. Therefore, a vent hole is provided to communicate with the cavity to ensure that the pressure in the cavity is balanced with the atmospheric pressure, maintaining the relative pressure of the chip in the pressure sensing component and ensuring the normal detection work of the chip in the pressure sensing component (the detection end of the chip faces the through hole and receives negative pressure, while the chip outside the through hole maintains relative pressure). The setting of the waterproof and breathable membrane can prevent water, allow air to pass through, and repel oil, ensuring that the working environment of the pressure sensing component in the cavity is dry. If the chip in the pressure sensing component works under absolute pressure conditions, the vent hole can be not provided, and in this case, the cavity is a closed structure.

[0065] Among them, the vent hole is provided at the bottom of the sensor housing and beside the valve body. This is more aesthetically pleasing and also convenient for manufacturing.

[0066] See Figure 4 、 5 As shown in, an insertion interface 20 is provided on one side of the sensor housing 6. At least one insertion pin 21 is also provided in the sensor housing 6. One end of the insertion pin 21 is inserted into the insertion interface 20, and the other end of the insertion pin 21 is arranged in the cavity 8;

[0067] The pressure sensing component 7 is electrically connected to the insertion pin 21 in the cavity 8.

[0068] Among them, the pressure sensing component has connection jacks that are inserted and mated with the insertion pins. When the pressure sensing component and the sensor housing are assembled, when the pressure sensing component is moved down and placed into the cavity, the insertion pins are directly inserted into the connection jacks to achieve electrical connection between the two, and the insertion pins in the insertion interface are used for electrical connection with the vehicle to achieve data transmission.

[0069] See Figures 2 to 7 As shown in 9 to 11, the valve body 2 includes a valve seat 22 and an air outlet nozzle tube 23. The chamber 1 is arranged in the valve seat 22. The chamber 1 communicates with the bottom of the valve seat 22. The sensor housing 6 is installed on the top surface of the valve seat 22, and the sensor housing 6 and the valve seat 22 are an integral structure;

[0070] The air inlet nozzle 5 is provided at the bottom of the valve seat 22. A valve tube 24 is provided on the side wall of the valve seat 22. The inner end of the air outlet nozzle tube 23 is connected to the valve tube 24, and the air outlet nozzle 5 is provided at the outer end of the air outlet nozzle tube 23.

[0071] In this embodiment, the air outlet nozzle tube and the valve tube are connected by welding methods, such as friction welding, resistance welding, and ultrasonic welding, for fixing the connection between the two and also preventing air leakage at the connection between the two.

[0072] See Figure 6 , 7 , as shown in FIGS. 9 - 11, a positioning protrusion 25 is provided on the outer wall of the valve seat 22, and the positioning protrusion 25 is coaxially arranged inside the valve tube 24;

[0073] A plurality of air outlet holes 26 are circumferentially arranged on the outer wall of the valve seat 22 outside the positioning protrusion 25. The inner ends of the air outlet holes 26 communicate with the chamber 1, and the air outlet holes 26 are arranged facing the valve tube 24;

[0074] An outer - side positioning cylinder 27 is provided at the outer - edge of the inner end of the air outlet nozzle tube 23, and the outer - side positioning cylinder 27 is sleeved on the outer surface of the valve tube 24; among them, the air outlet nozzle tube is fixed by welding through the outer - side positioning cylinder and the valve tube.

[0075] A diaphragm 28 is sleeved on the positioning protrusion 25, and the inner end - face of the diaphragm 28 abuts against a plurality of the air outlet holes 26;

[0076] A positioning member is further provided at the inner end of the air outlet nozzle tube 23, and the positioning member abuts against the outer end - face of the diaphragm 28.

[0077] An inward - concave arc - shaped surface 29 is provided on the outer surface of the valve seat 22 at the outer edge of the positioning protrusion 25. The outer ends of the air outlet holes 26 are arranged on the arc - shaped surface 29, and the inner end - face of the diaphragm 28 abuts against the arc - shaped surface 29;

[0078] The positioning member includes an inner - side positioning cylinder 30 and a plurality of connecting plates 31. The inner end of the inner - side positioning cylinder 30 is sleeved on the positioning protrusion 25, and the inner end of the inner - side positioning cylinder 30 abuts against the outer end - face at the center of the diaphragm 28. The plurality of connecting plates 31 are annularly arranged on the outer surface of the outer end of the inner - side positioning cylinder 30, and the outer ends of the connecting plates 31 are connected to the inner wall of the air outlet nozzle tube 23.

[0079] In this embodiment, the positioning protrusion is used to position the diaphragm. The diaphragm is directly sleeved on the positioning protrusion, and then the inner positioning cylinder is sleeved on the positioning protrusion and pressed on the diaphragm, pressing the diaphragm between the arc surface and the inner positioning cylinder, so that the diaphragm cannot move relative to the positioning protrusion, wherein the inner side of multiple air outlets at the inner positioning cylinder, therefore, under normal circumstances, the diaphragm is pressed against the air outlet, so that the gas in the air outlet nozzle tube cannot enter the chamber through the air outlet holes, and when negative pressure is generated at the air outlet nozzle tube, the diaphragm at the outer edge of the inner positioning cylinder will be driven to deform toward the air outlet nozzle tube, opening the air outlet, so that the negative pressure acts on the chamber through the air outlet, thereby generating negative pressure on the negative pressure chamber through the air inlet nozzle. When the air outlet nozzle does not generate negative pressure and there is reverse airflow, the diaphragm will be pushed close to the curved surface to block the air outlet. Or when no negative pressure is generated, the diaphragm returns to its original shape and presses against the curved surface to block the air outlet, thus playing a cut-off role, that is, the diaphragm acts as a one-way valve.

[0080] The multiple connecting plates are used for connecting the inner positioning tube and the air outlet nozzle pipe, and the air outlet nozzle pipe will not be blocked, thereby ensuring the normal use of the air outlet nozzle pipe.

[0081] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 present invention. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0082] In the present utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral one; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, for example, the two can form a mechanical abutment or abutment connection through abutment, contact, etc., the two can also be directly hung or hung through an intermediate medium, etc., or it can be the internal connection of the two elements or the interaction relationship between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An automotive brake booster vacuum sensor, comprising a valve body with a chamber inside and a sensor assembly arranged on the top of the valve body. An air inlet nozzle and an air outlet nozzle are respectively arranged at the bottom and side of the valve body. The sensor assembly includes a sensor housing and a pressure sensing assembly arranged inside the sensor housing, and is characterized in that: The sensor housing and the valve body are of an integral structure; A cavity is provided at the top of the sensor housing. A sealing cover for sealing the top of the cavity is installed on the top of the sensor housing, and the pressure sensing assembly is installed in the cavity; A through hole communicating with the chamber is provided at the bottom of the cavity. The pressure sensing assembly is installed on the bottom surface of the cavity. The detection end of the pressure sensing assembly faces the through hole, and the pressure sensing assembly is hermetically connected to the outer side of the top of the through hole, so that the top of the through hole is not communicated with the cavity.

2. The vehicle brake assist vacuum sensor according to claim 1, wherein: A first mounting groove is provided on the bottom surface of the cavity. The first mounting groove is of an annular structure or a frame structure. The first mounting groove is arranged outside the through hole. A first sealing member is provided in the first mounting groove, and the top surface of the first sealing member abuts against the bottom surface of the pressure sensing assembly.

3. The automotive brake boost vacuum sensor according to claim 2, wherein: The first sealing member is sealant. The sealant fills the first mounting groove, and the top surface of the sealant abuts against the bottom surface of the pressure sensing assembly; Or, the first sealing member is a sealing ring. The sealing ring is arranged in the first mounting groove, and the top surface of the sealing ring abuts against the bottom surface of the pressure sensing assembly.

4. The vehicle brake assist vacuum sensor according to claim 1, wherein: A second mounting groove is provided on the top of the sensor housing. The second mounting groove is of an annular structure or a frame structure. The second mounting groove is arranged outside the cavity. A downwardly extending extension frame is provided at the outer edge of the bottom of the sealing cover. The extension frame faces the second mounting groove; Sealant is provided in the second mounting groove. The extension frame is inserted into the second mounting groove and is hermetically limited in the second mounting groove by the sealant.

5. The automotive brake assist vacuum sensor according to claim 1, wherein: A vent hole communicating with the cavity is provided on the side wall of the sensor housing. A waterproof breathable film is installed in the cavity inside the vent hole.

6. The vehicle brake boost vacuum sensor according to claim 5, characterized in that: The vent hole is provided at the bottom of the sensor housing and is provided beside the valve body.

7. The automotive brake boost vacuum sensor according to claim 1, wherein: An insertion interface is provided on one side of the sensor housing. At least one insertion pin is also provided in the sensor housing. One end of the insertion pin is inserted into the insertion interface, and the other end of the insertion pin is arranged in the cavity; The pressure sensing assembly is electrically connected to the insertion pin in the cavity.

8. The vehicle brake boost vacuum sensor according to claim 1, wherein: The valve body includes a valve seat and an air outlet nozzle pipe. The chamber is arranged in the valve seat. The chamber communicates with the bottom of the valve seat. The sensor housing is installed on the top surface of the valve seat. The sensor housing and the valve seat are of an integral structure; The air inlet nozzle is provided at the bottom of the valve seat. A valve pipe is provided on the side wall of the valve seat. The inner end of the air outlet nozzle pipe is connected to the valve pipe, and the air outlet nozzle is provided at the outer end of the air outlet nozzle pipe.

9. The automotive brake assist vacuum sensor according to claim 8, wherein: A positioning protrusion is provided on the outer wall of the valve seat. The positioning protrusion is coaxially arranged inside the valve pipe; A plurality of air outlet holes are annularly distributed on the outer wall of the valve seat outside the positioning protrusion. The inner ends of the air outlet holes are communicated with the chamber. The air outlet holes face the valve pipe; An outer side positioning cylinder is provided at the outer edge of the inner end of the air outlet nozzle pipe. The outer side positioning cylinder sleeves on the outer surface of the valve pipe; A diaphragm is sleeved on the positioning protrusion. The inner end surface of the diaphragm abuts against the plurality of air outlet holes; The inner end of the air outlet nozzle tube is further provided with a positioning member, and the positioning member abuts against the outer end surface of the diaphragm.

10. The vehicle brake boost vacuum sensor according to claim 9, characterized in that: An inner concave arc surface is provided on the outer surface of the valve seat at the outer edge of the positioning protrusion, the outer end of the air outlet hole is arranged on the arc surface, and the inner end surface of the diaphragm abuts against the arc surface; The positioning member includes an inner positioning cylinder and a plurality of connecting plates. The inner end of the inner positioning cylinder is sleeved on the positioning protrusion, and the inner end of the inner positioning cylinder abuts against the outer end surface at the center of the diaphragm. The plurality of connecting plates are annularly arranged on the outer surface of the outer end of the inner positioning cylinder, and the outer ends of the connecting plates are connected to the inner wall of the air outlet nozzle tube.

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