Pressure switch for differential lock
By introducing a limit plate and seals into the pressure switch, the problem of spring fatigue caused by poor thrust control of the drive assembly is solved, thus protecting the spring, improving the stability of the equipment, extending its service life, and reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-28
- Publication Date
- 2026-03-17
AI Technical Summary
In existing pressure switches, the thrust control of the drive component is not good, resulting in excessive spring deformation, causing fatigue damage, reducing service life and increasing maintenance costs.
A limit plate is introduced into the pressure switch to limit the movement distance of the drive component. The limit plate prevents the drive component from moving further toward the elastic component, controls the maximum deformation of the spring, and further enhances the sealing and stability of the device through seals and limit grooves.
Effective control of spring deformation reduces fatigue damage, extends the service life of pressure switches, lowers maintenance costs, and improves the sealing and stability of equipment.
Smart Images
Figure CN224003121U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of pressure switches, and in particular to a pressure switch for a differential lock. Background Technology
[0002] A pressure switch is an industrial control component used to detect and control pressure changes. It is particularly common in the automotive industry, where pressure switches are frequently used to detect and control differential locks. When a vehicle encounters complex road conditions, the pressure switch can sense the pressure changes between the wheels and trigger the switch when a set value is reached. This plays a crucial role in improving vehicle safety and maneuverability.
[0003] In related technologies, a pressure switch includes a switch housing, a drive assembly slidably connected inside the switch housing, a first switch and a second switch inside the switch housing, and an elastic assembly on the second switch. The elastic assembly includes a first spring and a moving rod. The first spring is disposed on the switch housing, the moving rod is disposed on the first spring, and the second switch is fixedly connected to the moving rod. The first spring drives the second switch to abut against the first switch, and the drive assembly is used to drive the moving rod to move. When the first switch and the second switch abut against each other, the spring is in a compressed state, and the pressure switch is in an open state.
[0004] Users push the drive assembly to separate the first switch from the second switch. However, the magnitude of the thrust acting on the drive assembly is difficult to control. Excessive thrust can cause excessive deformation of the spring, leading to spring fatigue damage, reduced lifespan of the pressure switch, and increased maintenance costs. Utility Model Content
[0005] To address the problem of fatigue damage caused by excessive spring deformation, this application provides a pressure switch for differential locks.
[0006] This application provides a pressure switch for a differential lock, which adopts the following technical solution:
[0007] A pressure switch for a differential lock includes a switch housing, a drive assembly slidably connected within the switch housing, a first switch and a second switch disposed within the switch housing, and an elastic component disposed on the second switch. The elastic component includes a first spring and a moving rod. The first spring is disposed on the switch housing, the moving rod is disposed on the first spring, and the second switch is disposed on the moving rod. The moving rod is used to drive the second switch to move. The first spring drives the second switch to abut against the first switch. The drive assembly is used to drive the moving rod to move. The switch housing includes an inner switch housing, and a limiting plate is disposed on the inner switch housing. The limiting plate is located on the moving path of the drive assembly. When the drive assembly abuts against the limiting plate, the first spring is compressed, and the first switch and the second switch separate.
[0008] By adopting the above technical solution, when the drive component comes into contact with the limiting plate, the limiting plate is located on the movement path of the drive component. The limiting plate prevents the drive component from moving further toward the elastic component, limiting the movement distance of the drive component. This controls the maximum deformation of the spring, reduces the possibility of fatigue damage to the spring due to excessive deformation, and thus provides a certain degree of maintenance for the spring. At the same time, it extends the service life of the pressure switch and reduces the cost of equipment maintenance for the manufacturer.
[0009] Optionally, the inner shell of the switch has a through hole for the moving rod to pass through, and the inner shell of the switch has a fixing groove. The fixing groove has a first elastic sealing element, which abuts against the moving rod and deforms. The first sealing element is used to seal the through hole.
[0010] By adopting the above technical solution, when the drive component drives the moving rod to move, the first sealing element abuts against the moving rod and deforms, so that the sealing element seals the perforation, thereby preventing external air from entering the switch inner shell through the gap between the perforation and the moving rod, maintaining the stability of the equipment, and extending the service life of the equipment.
[0011] Optionally, a limiting groove is formed on the groove wall of the fixing groove, one side of the limiting groove is through, and the groove wall of the limiting groove near the drive assembly is riveted to the limiting plate, the limiting plate is used to seal the first sealing element.
[0012] By adopting the above technical solution, the limiting groove is penetrated on one side, and the groove wall of the limiting groove is riveted to the limiting plate, so that the limiting plate can be fixed on the groove wall of the limiting groove. By installing the limiting plate and the switch inner shell separately, the limiting plate and the switch inner shell can be disassembled, allowing the limiting plate to be made of a harder material, thereby reducing the damage to the limiting plate caused by the drive component due to long-term contact with the limiting plate. The limiting plate is used to seal the first sealing element, so that the first sealing element is fixed in the fixing groove, further strengthening the sealing of the perforation.
[0013] Optionally, the inner housing of the switch is provided with a sealing ring, which is located between the inner housing and the outer housing of the switch. The sealing ring is covered with a second, elastic sealing element, which is used to seal the gap between the inner housing and the outer housing of the switch.
[0014] By adopting the above technical solution, a second, elastic sealing element is provided outside the sealing ring. The double sealing of the sealing ring and the second sealing element allows for better sealing of the gap between the inner and outer shells of the switch, further enhancing the sealing performance of the equipment and preventing external air and impurities from entering the equipment.
[0015] Optionally, a second spring is provided on the inner shell of the switch. The second spring abuts against the second switch. When the second switch abuts against the first switch, the second spring is in a compressed state.
[0016] By adopting the above technical solution, when the second switch abuts against the first switch, the second spring is in a compressed state, which causes the second spring to exert a force on the second switch in the direction of the first switch, making the second switch abut against the first switch more firmly, thereby keeping the pressure switch in the open state.
[0017] Optionally, the drive assembly includes a top and a push rod. The top has a receiving groove for the push rod to move. The push rod is provided with a third spring for driving the push rod away from the top.
[0018] By adopting the above technical solution, the push rod is provided with a receiving groove for the push rod to move, and the third spring drives the push rod away from the push rod, so that the push rod and the push rod are slidably connected. The push rod needs to compress the third spring to a certain extent before the push rod can drive the moving rod to move, thus reducing the occurrence of accidental switch activation.
[0019] Optionally, a fixing block is placed on the switch housing, the top head is fixedly connected to the outer surface of the fixing block, and the inner surface of the fixing block abuts against the push rod.
[0020] By adopting the above technical solution, the top head is fixedly connected to the outer surface of the fixing block, and the inner surface of the fixing block abuts against the push rod, so that the fixing block is located between the top head and the push rod. The top head and the fixing block are fixed by riveting, so that the riveting will not affect the push rod, thereby allowing the push rod to slide more smoothly in the receiving groove.
[0021] Optionally, the push rod has a groove on its side, the groove penetrating the surface of the push rod away from the elastic component, the groove wall abutting against the fixing block, the fixing block being used to prevent the push rod from completely disengaging from the receiving groove, and the third spring being in a compressed state when the groove abuts against the fixing block.
[0022] By adopting the above technical solution, when the push rod moves away from the top head, the fixing block is located on the movement path of the push rod completely detached from the receiving groove, so that the push rod will not be pulled out of the receiving groove and the integrity of the equipment structure is maintained; when the groove abuts against the fixing block, the third spring is in a compressed state, so that the push rod is fixed on the side away from the top head, maintaining the state of the first switch and the second switch abutting.
[0023] In summary, this application includes at least one of the following beneficial technical effects:
[0024] 1. When the drive component comes into contact with the limit plate, the limit plate is located on the movement path of the drive component. The limit plate prevents the drive component from moving further toward the elastic component, limiting the movement distance of the drive component. This controls the maximum deformation of the spring, reduces the possibility of fatigue damage to the spring due to excessive deformation, and thus provides a certain degree of maintenance for the spring. At the same time, it extends the service life of the pressure switch and reduces the cost of equipment maintenance for the manufacturer.
[0025] 2. When the drive assembly drives the moving rod to move, the first seal abuts against the moving rod and deforms, so that the seal seals the perforation, thereby preventing external air from entering the switch housing through the gap between the perforation and the moving rod, maintaining the stability of the equipment, and extending the service life of the equipment. Attached Figure Description
[0026] Figure 1 This is a structural schematic diagram of an embodiment of this application;
[0027] Figure 2 It is along Figure 1 Cross-sectional view of line AA in the middle;
[0028] Figure 3 yes Figure 2 Enlarged schematic diagram of part B;
[0029] Figure 4 yes Figure 2 An enlarged schematic diagram of section C.
[0030] Reference numerals: 1. Switch housing; 11. First switch; 111. First contact; 12. Second switch; 121. Second contact; 122. Fixing hole; 13. Fixing shell; 131. First annular groove; 14. Second spring; 15. Fixing block; 2. Drive assembly; 21. Top head; 211. Receiving groove; 212. Second receiving groove; 22. Push rod; 221. First receiving groove; 222. Groove; 23. Third spring; 3. Elastic assembly; 31. First spring; 32. Moving rod; 321. Placement groove; 322. Second annular groove; 323. Third annular groove; 4. Switch inner housing; 41. Limiting plate; 42. Through hole; 43. Fixing groove; 431. First seal; 432. Limiting groove; 44. Sealing ring; 441. Second seal. Detailed Implementation
[0031] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.
[0032] This embodiment discloses a pressure switch for a differential lock. (Refer to...) Figure 1 and Figure 2A pressure switch for a differential lock includes a switch housing 1, within which a drive assembly 2 is slidably connected. The drive assembly 2 is used to open and close the pressure switch. A first switch 11 is fixedly connected within the switch housing 1, and two first contacts 111 are fixedly connected to the first switch 11. A second switch 12 is slidably connected within the switch housing 1, located on the side of the first contacts 111 away from the drive assembly 2. Two second contacts 121 are fixedly connected to the second switch 12, and the second contacts 121 can abut against corresponding first contacts 111. An elastic assembly 3 is fixedly connected to the second switch 12, and the elastic assembly 3 includes a first spring 31 and a moving rod 32. A fixing hole 122 is provided on the second switch 12 for the moving rod 32 to pass through, and the wall of the fixing hole 122 abuts against the outer surface of the moving rod 32.
[0033] Reference Figure 2 and Figure 3 A placement groove 321 is formed on the surface of the moving rod 32 away from the drive assembly 2. One end of the first spring 31 is fixedly connected to the bottom wall of the placement groove 321, and the other end of the first spring 31 is fixedly connected to the switch housing 1. The first spring 31 is used to drive the second switch 12 to abut against the first switch 11. A fixed shell 13 corresponding to the moving rod 32 is fixedly connected to the switch housing 1. The fixed shell 13 is located on the side of the moving rod 32 away from the drive assembly 2, and the fixed shell 13 is sleeved on the first spring 31. The drive assembly 2 is used to drive the moving rod 32 to move linearly towards the fixed shell 13.
[0034] Reference Figure 3 A second spring 14 is fitted onto the outer surfaces of the moving rod 32 and the fixed housing 13. A first annular groove 131 is formed on the outer surface of the fixed housing 13, penetrating the surface of the fixed housing 13 near the moving rod 32. One end of the second spring 14 abuts against the surface of the second switch 12 near the fixed housing 13, and the other end of the second spring 14 abuts against the groove wall of the first annular groove 131. A second annular groove 322 is formed on the outer surface of the moving rod 32, penetrating the surface of the moving rod 32 near the fixed housing 13, and the bottom wall of the second annular groove 322 abuts against the second switch 12. When the second switch 12 abuts against the first switch 11, both the first spring 31 and the second spring 14 are in a compressed state. When the second annular groove 322 moves away from the groove wall of the fixed housing 13 and abuts against the second switch 12, the moving rod 32 drives the second switch 12 to move.
[0035] Reference Figure 2 and Figure 3 A switch inner shell 4, made of plastic, is fixedly connected inside the switch outer shell 1. An annular limiting plate 41 is fixedly connected to the switch inner shell 4, through which the moving rod 32 passes, and the inner wall of the limiting plate 41 abuts against the outer surface of the moving rod 32. The limiting plate 41 is made of copper and is located on the movement path of the drive assembly 2.
[0036] Reference Figure 2 and Figure 3 When the drive assembly 2 abuts against the limiting plate 41, the first spring 31 and the second spring 14 are in a compressed state, the moving rod 32 abuts against the fixed shell 13, and the first switch 11 and the second switch 12 separate, thus disconnecting the pressure switch circuit. When the drive assembly 2 does not abut against the limiting plate 41, the first spring 31 and the second spring 14 are in a compressed state, the moving rod 32 separates from the fixed shell 13, and the second switch 12 abuts against the first switch 11, thus connecting the pressure switch circuit.
[0037] Reference Figure 2 and Figure 3 A third annular groove 323 is formed on the outer surface of the moving rod 32, penetrating the surface of the moving rod 32 near the drive assembly 2. A through hole 42 is formed on the surface of the switch inner shell 4 near the first spring 31, through which the moving rod 32 passes, and the bottom wall of the third annular groove 323 abuts against the wall of the through hole 42. An annular fixing groove 43 is formed on the wall of the through hole 42, penetrating the surface of the switch inner shell 4 near the drive assembly 2. A first elastic sealing member 431 is detachably connected in the fixing groove 43. The first sealing member 431 includes a sealing ring, is sleeved on the moving rod 32 and deforms, and is used to seal the through hole 42.
[0038] Reference Figure 2 and Figure 3 An annular limiting groove 432 is provided on the bottom wall of the fixing groove 43, and the limiting groove 432 penetrates the surface of the inner shell 4 of the switch near the drive assembly 2. The groove wall of the limiting groove 432 near the drive assembly 2 is riveted to the limiting plate 41, and the first sealing member 431 is located between the groove wall of the fixing groove 43 away from the drive assembly 2 and the limiting plate 41.
[0039] Reference Figure 2 A sealing ring 44 is integrally formed on the surface of the switch inner housing 4 near the drive assembly 2, and the sealing ring 44 is located between the switch inner housing 4 and the switch outer housing 1. A second, elastic sealing element 441, including a sealing ring, is fitted on the outer surface of the sealing ring 44. The second sealing element 441 is used to seal the gap between the switch inner housing 4 and the switch outer housing 1.
[0040] Reference Figure 2The drive assembly 2 includes a top head 21 and a push rod 22. A receiving groove 211 is formed on the surface of the top head 21 away from the moving rod 32, allowing the push rod 22 to move. A first receiving groove 221 is formed on the surface of the push rod 22 near the moving rod 32, and a second receiving groove 212 is formed on the bottom wall of the receiving groove 211. A third spring 23 is disposed within the receiving groove 211, with its two ends fixedly connected to the bottom walls of the first receiving groove 221 and the second receiving groove 212, respectively. The third spring 23 drives the push rod 22 away from the top head 21. When the push rod 22 slides along the groove wall of the receiving groove 211, the third spring 23 is in a compressed state.
[0041] Reference Figure 2 and Figure 4 An annular fixing block 15 is placed on the switch housing 1. The end of the top head 21 away from the elastic component 3 is riveted to the outer surface of the fixing block 15, and the inner surface of the fixing block 15 abuts against the outer surface of the push rod 22. An annular groove 222 is formed on the outer surface of the push rod 22, and the groove 222 penetrates the surface of the push rod 22 away from the elastic component 3. The groove wall of the groove 222 abuts against the fixing block 15, and the fixing block 15 is located on the movement path of the push rod 22 completely disengaged from the receiving groove 211. When the groove 222 approaches the groove wall of the elastic component 3 and abuts against the fixing block 15, the third spring 23 is in a compressed state, and the second switch 12 abuts against the first switch 11.
[0042] The implementation principle of a pressure switch for a differential lock according to an embodiment of this application is as follows: When the push rod 22 is pushed, the push rod 22 drives the top head 21 to drive the moving rod 32 to move towards the direction of the fixed shell 13. The groove wall of the second annular groove 322 away from the fixed shell 13 drives the second switch 12 to disengage from the first switch 11 until the top head 21 abuts against the limiting plate 41. At this time, the first switch 11 and the second switch 12 are separated, and the pressure switch is in the open state.
[0043] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0044] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of this application should be included within the protection scope of this application.
Claims
1. A pressure switch for a differential lock, comprising a switch housing (1), wherein a drive assembly (2) is slidably connected within the switch housing (1), and a first switch (11) and a second switch (12) are provided within the switch housing (1). An elastic assembly (3) is provided on the second switch (12), the elastic assembly (3) comprising a first spring (31) and a moving rod (32), wherein the first spring (31) is disposed on the switch housing (1), the moving rod (32) is disposed on the first spring (31), and the second switch (12) is disposed on the moving rod (32). The moving rod (32) is used to drive the second switch (12) to move, the first spring (31) drives the second switch (12) to abut against the first switch (11), and the drive assembly (2) is used to drive the moving rod (32) to move, characterized in that: The switch shell (1) is provided with a switch inner shell (4), the switch inner shell (4) is provided with a limiting plate (41), the limiting plate (41) is located on the moving path of the driving assembly (2), when the driving assembly (2) abuts against the limiting plate (41), the first spring (31) is in the compressed state, and the first switch (11) is separated from the second switch (12).
2. A pressure switch for a differential lock as claimed in claim 1, characterized in that: The switch inner shell (4) is provided with a through hole (42), the through hole (42) is used for the mobile rod (32) to pass through, the switch inner shell (4) is provided with a fixed groove (43), the fixed groove (43) is provided with a first sealing element (431) with elasticity, the first sealing element (431) abuts against the mobile rod (32) and is deformed, and the first sealing element (431) is used for sealing the through hole (42).
3. A pressure switch for a differential lock as claimed in claim 2, characterised in that: The groove wall of the fixed groove (43) is provided with a limiting groove (432), one side of the limiting groove (432) penetrates, and the groove wall of the limiting groove (432) close to the driving assembly (2) is riveted to the limiting plate (41), and the limiting plate (41) is used for plugging the first sealing element (431).
4. A pressure switch for a differential lock as claimed in claim 1, characterized in that: The switch inner shell (4) is provided with a sealing ring (44), the sealing ring (44) is located between the switch inner shell (4) and the switch shell (1), the sealing ring (44) is provided with a second sealing element (441) with elasticity, and the second sealing element (441) is used for sealing the gap between the switch inner shell (4) and the switch shell (1).
5. A pressure switch for a differential lock as claimed in claim 1, characterized in that: The switch inner shell (4) is provided with a second spring (14), the second spring (14) abuts against the second switch (12), when the second switch (12) abuts against the first switch (11), the second spring (14) is in the compressed state.
6. A pressure switch for a differential lock as claimed in claim 1, characterized in that: The driving assembly (2) comprises a top head (21) and a push rod (22), the top head (21) is provided with a containing groove (211), the containing groove (211) is used for the movement of the push rod (22), the push rod (22) is provided with a third spring (23), and the third spring (23) is used for driving the push rod (22) to move away from the top head (21).
7. A pressure switch for a differential lock as claimed in claim 6, characterised in that: The switch shell (1) is provided with a fixed block (15), the top head (21) is fixedly connected to the outer surface of the fixed block (15), and the inner surface of the fixed block (15) abuts against the push rod (22).
8. A pressure switch for a differential lock as claimed in claim 6, characterized in that: The push rod (22) is provided with a groove (222) on the side surface, the groove (222) penetrates the surface of the push rod (22) away from the elastic assembly (3), the groove wall of the groove (222) abuts against the fixed block (15), the fixed block (15) is used for blocking the push rod (22) from completely separating from the containing groove (211), when the groove (222) abuts against the fixed block (15), the third spring (23) is in the compressed state.
9. A pressure switch for a differential lock as claimed in claim 1, characterized in that: The limiting plate (41) is made of hard metal, and the switch inner shell (4) is made of plastic.