Normally closed neutral gear pressure switch
By adopting the dual contact piece spring design and structural optimization in the normally closed neutral pressure switch, the problem of loose static contact piece caused by rubber aging in the prior art is solved, faster contact response and more controllable stroke are achieved, and the stable operation of the equipment is ensured.
Patent Information
- Application Number
- CN202520345377.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2035-03-03
AI Technical Summary
The rear cover of the existing pressure switch is supported by a rubber. After the rubber aging occurs, the static contact plate will loosen, affecting the stroke or normally closed faults.
A normally closed neutral pressure switch is designed, adopting a double contact piece spring design to speed up the response time of contact contacts, and the rivet pressure height is consistent and the stroke is controllable through the setting of the fifth step surface and the inward concave; the limit of the sealing piece ensures that the compression amount is controllable; the limit of the sixth step surface and the first step surface effectively prevents the push rod assembly from destroying the electrical cavity.
Through the design and structural optimization of the double contact piece spring, the response speed and stability of contact contacts are improved, the controllability of stroke and the integrity of the electrical cavity are ensured, and the occurrence of faults is avoided.
Smart Images
Figure CN222690590U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a normally closed neutral pressure switch. Background Art
[0002] Neutral is often an important gear in the gearbox. Whether its entire system operates normally determines whether the truck can start normally. Therefore, it is particularly important to use the existing pressure switch for gearbox neutral indication. At present, the neutral switches of various OEMs have high after-sales service and various structures. The rear cover of the existing pressure switch is supported by rubber alone. After the rubber ages in the later period of use, it cannot be pressed down, resulting in the loosening of the static contact piece affecting the stroke or the occurrence of normally closed faults. Utility Model Content
[0003] The utility model aims to solve the shortcomings in the prior art and proposes a normally closed neutral pressure switch.
[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a normally closed neutral pressure switch, comprising a shell, a plug assembly, a contact piece spring, a plug cover, a static contact, a moving contact and a push rod assembly, an open cavity is provided at the front end of the shell, the lower end of the plug assembly is connected to the shell through the wall of the open cavity, a push rod assembly mounting portion is provided at the rear end of the shell, the push rod assembly is installed in the push rod assembly mounting portion, an inner cavity is provided at the lower end of the plug assembly, the inner cavity is covered by the plug cover, two static contacts are provided in the inner cavity, the two static contacts are arranged on corresponding static contact pieces, and the two static contacts are connected to corresponding pins on the plug assembly, a moving contact piece is provided above the static contact, a moving contact is provided at the corresponding static contact of the moving contact piece, and the moving contact piece passes through the upper end of the push rod from bottom to top; a contact piece spring is provided between the upper end of the moving contact piece corresponding to the moving contact and the upper wall of the inner cavity, and the lower end of the push rod is driven by the push rod assembly.
[0005] Furthermore, two spring grooves and one push rod groove are provided on the upper wall of the inner cavity, and the upper end of the contact leaf spring is placed in the corresponding spring grooves.
[0006] Furthermore, a first step surface, a second step surface, a third step surface, a fourth step surface, and a fifth step surface are sequentially provided on the opening cavity wall at the front end of the shell from bottom to top, the first step surface is located at the upper end of the push rod assembly mounting part, the outer side of the first limiting plate covers and is fixed on the first step surface, and a first through hole through which the push rod passes is provided in the center of the first limiting plate, the outer side of the sealing plate covers the second step surface, the second limiting plate covers the third step surface and the second limiting plate limits the two ends of the sealing plate through the second step surface, and the outer side of the plug cover abuts against the fourth step surface; the protrusion on the outer side of the plug assembly abuts against the fifth step surface, and an inner recess for riveting is provided above the protrusion on the outer side of the plug assembly.
[0007] Furthermore, a limiting protrusion is provided at the lower end of the plug cover to abut against the upper end of the second limiting plate.
[0008] Furthermore, the lower end of the ejector rod passes through the plug cover.
[0009] Furthermore, a circle of second limiting protrusions is provided on the inner side of the second step surface, and the lower end of the outer side of the sealing sheet is placed on the outer side of the second limiting protrusions.
[0010] Furthermore, the push rod assembly includes an upper push rod, a lower push rod, a first spring and a second spring. The lower end of the upper push rod is provided with a lower opening, the upper end of the lower push rod is provided with an upper opening, the upper end of the lower push rod is inserted into the lower opening, the lower end of the second spring is against the bottom of the lower opening, and the upper end of the second spring is against the upper part of the upper opening; a spring limiting step is provided on the outer side of the upper push rod, the first spring is sleeved on the outer side of the upper push rod, the lower end of the first spring is against the spring limiting step, and the upper end of the first spring is against the lower end of the first limiting plate.
[0011] Furthermore, the upper end of the upper push rod is in an upwardly shrinking shape.
[0012] Furthermore, a sixth step surface is provided in the push rod assembly installation portion, the lower push rod is T-shaped, the lower opening wall is against the sixth step surface, and both sides of the upper end of the lower push rod are limited by the sixth step surface.
[0013] Furthermore, the two contact leaf springs are symmetrically arranged.
[0014] The beneficial effects of the utility model are: the double contact sheet spring design speeds up the response time of contact point contact; the fifth step surface and the concave setting make the riveting height consistent and the stroke controllable; the sealing sheet is limited and the compression amount is controllable; the sixth step surface and the first step surface are limited to effectively prevent the push rod assembly from damaging the electrical cavity. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a cross-sectional view.
[0016] Figure 2 It is a schematic diagram of the utility model structure.
[0017] 1 is a housing; 2 is a plug assembly; 3 is a contact piece spring; 4 is a plug cover; 5 is a stationary contact; 6 is a moving contact; 7 is a push rod; 8 is an upper push rod; 9 is a lower push rod; 11 is a first step surface; 12 is a second step surface; 13 is a third step surface; 14 is a fourth step surface; 15 is a fifth step surface; 21 is a first limit plate; 22 is a sealing plate; 23 is a second limit plate; 24 is a protrusion; 25 is a recess; 26 is a second limit protrusion; 51 is a stationary contact piece; 61 is a moving contact piece; 81 is a first spring; 91 is a second spring. DETAILED DESCRIPTION
[0018] The following will be combined with the attached embodiment of the present utility model Figure 1-2, the technical solutions in the embodiments of the utility model are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.
[0019] Example 1 Reference Figure 1-2 A normally closed neutral pressure switch comprises a shell 1, a plug assembly 2, a contact sheet spring 3, a plug cover 4, a static contact 5, a moving contact 6 and a push rod assembly. An open cavity is provided at the front end of the shell, and the lower end of the plug assembly is connected to the shell through the wall of the open cavity. A push rod assembly mounting portion is provided at the rear end of the shell, and the push rod assembly is installed in the push rod assembly mounting portion. An inner cavity is provided at the lower end of the plug assembly, and the inner cavity is covered by the plug cover. Two static contacts are provided in the inner cavity, and the two static contacts are arranged on corresponding static contact sheets 51, and the two static contacts are connected to corresponding pins on the plug assembly. A moving contact sheet 61 is provided above the static contact, and the moving contact sheet is provided with a moving contact at the corresponding static contact, and the moving contact sheet passes through the upper end of the push rod 7 from bottom to top; a contact sheet spring 3 is provided between the upper end of the moving contact sheet corresponding to the moving contact and the upper wall of the inner cavity, and the lower end of the push rod is driven by the push rod assembly.
[0020] A normally closed neutral pressure switch has two spring slots and a push rod slot on the upper wall of the inner cavity, and the upper end of the contact leaf spring is placed in the corresponding spring slot.
[0021] A normally closed neutral pressure switch, the opening cavity wall at the front end of the housing is provided with a first step surface 11, a second step surface 12, a third step surface 13, a fourth step surface 14, and a fifth step surface 15 from bottom to top, the first step surface is located at the upper end of the push rod assembly mounting portion, the first limit plate 21 covers and is fixed on the first step surface, and the first limit plate is provided with a first through hole through which the push rod passes in the center, the sealing sheet 22 covers the second step surface on the outside, the second limit plate 23 covers the third step surface, and the second limit plate limits the two ends of the sealing sheet through the second step surface, the plug cover is against the fourth step surface on the outside; the protrusion 24 on the outside of the plug assembly is against the fifth step surface, and an inner concave 25 for riveting is provided above the protrusion 24 on the outside of the plug assembly. The lower end of the inner concave is an inclined surface.
[0022] A normally closed neutral pressure switch, the lower end of the plug cover is also provided with a limit protrusion which abuts against the upper end of the second limit plate.
[0023] A normally closed neutral pressure switch, the lower end of the push rod passes through the plug cover.
[0024] A normally closed neutral pressure switch, wherein a circle of second limiting protrusions 26 are further arranged on the inner side of the second step surface, and the lower end of the outer side of the sealing sheet is placed on the outer side of the second limiting protrusions.
[0025] A normally closed neutral pressure switch, the push rod assembly includes an upper push rod 8, a lower push rod 9, a first spring 81 and a second spring 91, the lower end of the upper push rod is provided with a lower opening, the upper end of the lower push rod is provided with an upper opening, the upper end of the lower push rod is inserted into the lower opening, the lower end of the second spring abuts against the bottom of the lower opening, and the upper end of the second spring abuts against the upper part of the upper opening; a spring limiting step is provided on the outer side of the upper push rod, the first spring is sleeved on the outer side of the upper push rod, the lower end of the first spring abuts against the spring limiting step, and the upper end of the first spring abuts against the lower end of the first limiting plate.
[0026] A normally closed neutral pressure switch, the upper end of the upper push rod is in an upwardly contracted shape.
[0027] A normally closed neutral pressure switch, a sixth step surface is arranged in a push rod assembly mounting portion, a lower push rod is T-shaped, a lower opening wall abuts against the sixth step surface, and both sides of the upper end of the lower push rod are limited by the sixth step surface.
[0028] A normally closed neutral pressure switch, the sealing piece is an oil seal ring.
[0029] A normally closed neutral pressure switch, wherein two contact leaf springs are symmetrically arranged.
[0030] The above are only preferred specific implementation methods of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the utility model, who makes equivalent replacements or changes based on the technical scheme and utility model concept of the utility model, should be covered by the protection scope of the utility model.
Claims
1. A normally closed neutral pressure switch, comprising a housing (1), a plug assembly (2), a contact sheet spring (3), a plug cover (4), a stationary contact (5), a moving contact (6) and a push rod assembly, wherein an open cavity is provided at the front end of the housing, the lower end of the plug assembly is connected to the housing through the wall of the open cavity, a push rod assembly mounting portion is provided at the rear end of the housing, the push rod assembly is mounted in the push rod assembly mounting portion, an inner cavity is provided at the lower end of the plug assembly, the inner cavity is covered by the plug cover, two stationary contacts are provided in the inner cavity, the two stationary contacts are arranged on corresponding stationary contact sheets, and the two stationary contacts are connected to corresponding pins on the plug assembly, characterized in that: A moving contact piece is provided above the static contact, and a moving contact is provided at a position corresponding to the static contact of the moving contact piece. The moving contact piece passes through the upper end of the push rod (7) from bottom to top; a contact piece spring is provided between the position of the upper end of the moving contact piece corresponding to the moving contact and the upper wall of the inner cavity, and the lower end of the push rod is driven by a push rod assembly.
2. A normally closed neutral pressure switch according to claim 1, characterized in that: Two spring grooves and a push rod groove are arranged on the upper wall of the inner cavity, and the upper end of the contact leaf spring is placed in the corresponding spring grooves.
3. A normally closed neutral pressure switch according to claim 1, characterized in that: The opening cavity wall at the front end of the shell is provided with a first step surface (11), a second step surface (12), a third step surface (13), a fourth step surface (14), and a fifth step surface (15) in sequence from bottom to top. The first step surface is located at the upper end of the push rod assembly mounting portion. The first limit plate (21) covers and is fixed on the first step surface on the outside, and a first through hole is provided in the center of the first limit plate for the push rod to pass through. The sealing sheet (22) covers the second step surface on the outside. The second limit plate (23) covers the third step surface and the second limit plate limits the two ends of the sealing sheet through the second step surface. The outer side of the plug cover abuts against the fourth step surface. The protrusion (24) on the outer side of the plug assembly abuts against the fifth step surface. An inner recess (25) for riveting is provided above the protrusion on the outer side of the plug assembly.
4. A normally closed neutral pressure switch according to claim 3, characterized in that: The lower end of the plug cover is also provided with a limiting protrusion which abuts against the upper end of the second limiting plate.
5. A normally closed neutral pressure switch according to claim 3, characterized in that: The lower end of the ejector rod passes through the plug cover.
6. A normally closed neutral pressure switch according to claim 3, characterized in that: A circle of second limiting protrusions (26) is also provided on the inner side of the second step surface, and the lower end of the outer side of the sealing sheet is placed on the outer side of the second limiting protrusions.
7. A normally closed neutral pressure switch according to claim 3, characterized in that: The push rod assembly comprises an upper push rod (8), a lower push rod (9), a first spring (81) and a second spring (91); the lower end of the upper push rod is provided with a lower opening, the upper end of the lower push rod is provided with an upper opening, the upper end of the lower push rod is inserted into the lower opening, the lower end of the second spring abuts against the bottom of the lower opening, and the upper end of the second spring abuts against the upper part of the upper opening; a spring limiting step is provided on the outer side of the upper push rod, the first spring is sleeved on the outer side of the upper push rod, the lower end of the first spring abuts against the spring limiting step, and the upper end of the first spring abuts against the lower end of the first limiting plate.
8. A normally closed neutral pressure switch according to claim 7, characterized in that: The upper end of the upper push rod is in an upwardly shrinking shape.
9. A normally closed neutral pressure switch according to claim 7, characterized in that: A sixth step surface is arranged in the installation part of the push rod assembly, the lower push rod is T-shaped, the lower opening wall is against the sixth step surface, and both sides of the upper end of the lower push rod are limited by the sixth step surface.
10. A normally closed neutral pressure switch according to claim 1, characterized in that: The two contact leaf springs are arranged symmetrically.