Button switch of automobile ceiling lamp

Abstract

The utility model discloses an automobile dome light button switch, relates to the field of switches, and solves the problem that the switch is difficult to adapt to a low-temperature environment. A plurality of circumferentially arranged convex ribs are arranged on the outer peripheral surface of the operation button, the length direction of the convex ribs is arranged along the axial direction of the operation button, the operation button is movably arranged in the mounting hole, and the surfaces of the convex ribs are in sliding contact with the inner wall of the mounting hole so as to form a gap between the outer peripheral surface of the operation button and the inner wall of the mounting hole; and the gaps are filled with lubricating grease. The convex ribs are additionally arranged on the peripheral surface of the operation button and are in sliding contact with the inner wall of the mounting hole of the hollow shell, so that the contact area of the operation button and the hollow shell is reduced, the low-temperature clamping stagnation phenomenon caused by direct large-area contact is effectively reduced, the friction coefficient can be reduced by matching with the lubricating grease filled in the interval, and the service life is prolonged. Smooth sliding between the components can be kept even at low temperature, the operation flexibility of the switch is improved, a user feels smoother during operation, and the user experience is improved.

Description

Technical Field

[0001] The utility model relates to the field of switches, in particular to a push button switch for a car ceiling light. Background Art

[0002] In the known push button switch, pressing the button causes the annular movable contact piece to rotate relative to the fixed contact piece, thereby switching the contact path. Taking the Chinese invention patent: CN106816336B, the push button switch as an example, it discloses a hollow housing having an inner peripheral surface formed with a guide portion, the guide portion including a rotation limiting portion and a return limiting portion; an operating button, which includes a first ratchet tooth extending in a circumferential direction and capable of moving up and down in an axial direction; a contact member formed by a single metal plate, which includes an engagement portion engaged with a cam follower and a movable contact, and the contact member is configured to rotate integrally with the cam follower.

[0003] This push button switch faces the challenge of low temperature environment when it is actually used to turn on and off the car ceiling light. In cold climates, the various components of the push button switch may become stiff due to the drop in temperature, especially the close fitting part between the operating button and the hollow shell. Since the gap between them is very small, they are very easy to get stuck at low temperatures, which leads to slow switch action and stiff feel. This condition will cause the switch to become less flexible during operation, making it difficult for users to feel the exact change of gear state, affecting the user experience. In addition, the contact member design in the push button switch is almost flat. Although it can maintain good elasticity and contact stability at normal temperature, in low temperature environment, low temperature will increase the brittleness of the material, resulting in a decrease in the elastic performance of the contact member, which is easy to cause elastic fatigue. This means that after multiple pressing operations, the contact member may not be able to quickly return to its original state, affecting its effective contact with the fixed contact, which may lead to poor contact, increased resistance, and even circuit failure. Summary of the invention

[0004] Purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a car ceiling light button switch to solve the problem of being difficult to apply to low temperature environment.

[0005] The technical solution of the utility model comprises a hollow shell, an operating button, a cam follower and a plurality of stationary contact terminals, wherein the operating button comprises ratchet teeth extending in a circumferential direction and being able to move up and down in an axial direction, the stationary contact terminal being fixedly mounted on the hollow shell, a mounting hole penetrating the inside and the outside of the hollow shell being provided in the hollow shell, a plurality of circumferentially arranged convex ribs being provided on the outer circumferential surface of the operating button, the length direction of the convex ribs being arranged along the axial direction of the operating button, the operating button being movably arranged in the mounting hole, the surface of the convex ribs being slidably contacted with the inner wall of the mounting hole to form a gap between the outer circumferential surface of the operating button and the inner wall of the mounting hole, and the gap being filled with grease.

[0006] By adopting the above technical solution, a convex rib is added to the outer peripheral surface of the operating button and the rib is in sliding contact with the inner wall of the mounting hole of the hollow shell, thereby reducing the contact area between the operating button and the hollow shell, effectively reducing the low-temperature jamming phenomenon caused by direct large-area contact, and the grease filled in the interval can reduce the friction coefficient, and smooth sliding between components can be maintained even at low temperatures, thereby improving the operational flexibility of the switch, making the user feel smoother during operation, and enhancing the user experience.

[0007] In a possible design, the convex ribs extend toward the ratchet teeth and each convex rib corresponds to a ratchet tooth to form an integral connection, and a lubrication groove penetrating the interval and the inside of the hollow shell is formed between adjacent ratchet teeth.

[0008] With the above design, since the grease is evenly distributed through the integrated connection between the ratchet teeth and the convex ribs, the grease can flow into the lubrication groove, ensuring that the grease is evenly covered in the entire movable range of the operating button. This reduces the wear between the contact surface between the operating button and the cam follower, prevents jamming or damage caused by lack of lubrication during long-term use or in low-temperature environments, makes pressing the operating button easier and smoother, and improves the comfort of operation.

[0009] In one possible design, a moving contact spring is fixedly mounted on the cam follower. The moving contact spring is annular and is sleeved on the cam follower. The stationary contact terminal is fixed in a hollow shell above the moving contact spring. The moving contact spring has a plurality of circumferentially arranged elastic contact arms. The elastic contact arms are tilted upward to form contact with the stationary contact terminal.

[0010] With the above design, the upward structure of the elastic contact arm can provide the necessary elastic pressure during the contact process. Its shape helps to reduce the degradation of elastic properties caused by material embrittlement. Even in low temperature environments, it can maintain a good contact state, reduce the possibility of poor contact, and ensure the stability and reliability of ceiling light control.

[0011] In a possible design, the end of the elastic contact arm forms a bent end, and the bent end is bent downward to form an arc shape.

[0012] With the above design, the bent end is used to contact the stationary contact terminal, and the shape of the bent end helps the elastic contact arm to switch between the stationary contact terminals more smoothly, further reducing the sticking phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the appearance structure of a specific embodiment of the utility model;

[0014] Figure 2 It is a cross-sectional view of a specific embodiment of the utility model;

[0015] Figure 3 It is a schematic diagram of the internal structure of a specific embodiment of the utility model;

[0016] Figure 4 This is a schematic diagram of the structure of the dynamic contact spring of the utility model;

[0017] Among them, 1. hollow shell; 2. operation button; 3. cam follower; 4. static contact terminal; 21. ratchet tooth; 11. mounting hole; 22. convex rib; 23. interval; 24. lubrication groove; 5. dynamic contact spring; 51. elastic contact arm; 52. bent end. DETAILED DESCRIPTION

[0018] like Figure 1-3 The illustrated automobile ceiling light button switch comprises a hollow shell 1, an operating button 2, a cam follower 3 and a plurality of stationary contact terminals 4, wherein the operating button 2 comprises a ratchet tooth 21 extending in the circumferential direction and capable of moving up and down in the axial direction, and the stationary contact terminal 4 is fixedly mounted on the hollow shell 1, and a mounting hole 11 penetrating the inside and outside is provided in the hollow shell 1, and a plurality of circumferentially arranged convex ribs 22 are provided on the outer circumferential surface of the operating button 2, and the length direction of the convex ribs 22 is arranged along the axial direction of the operating button 2, and the operating button 2 is movably arranged in the mounting hole 11, and the surface of the convex ribs 22 slides and contacts the inner wall of the mounting hole 11 to form a gap 23 between the outer circumferential surface of the operating button 2 and the inner wall of the mounting hole 11, and grease is filled in the gap 23. First, the operating button 2 contacts the inner wall of the mounting hole 11 through the convex ribs 22, and compared with the large-area contact of the outer circumferential surface in the background technology, the contact area is reduced. Secondly, the grease is used to fill the gap 23, which has a lubricating effect and reduces the friction coefficient. In this way, the sticking phenomenon in low temperature environment is effectively reduced, and the flexibility of switch switching is enhanced. In addition, the grease can be used as a part of the sealing structure to prevent external pollutants from entering the hollow housing 1 through the gap 23, thereby protecting the internal switch structure.

[0019] The convex rib 22 extends toward the ratchet teeth 21 and each convex rib 22 corresponds to a ratchet tooth 21 to form an integral connection. A through gap 23 and a lubrication groove 24 inside the hollow shell 1 are formed between adjacent ratchet teeth 21. Grease can flow into the lubrication groove 24 to the contact surface between the operating button 2 and the cam follower 3. When the operating button 2 is pressed, the contact surface contacts frequently and the contact pressure is large, making the pressing of the operating button 2 easier and smoother.

[0020] like Figure 4 As shown, a moving contact spring 5 is fixedly mounted on the cam follower 3. The moving contact spring 5 is annular and is sheathed on the cam follower 3. The annular moving contact spring 5 facilitates the assembly of the moving contact spring 5, effectively utilizes the internal space, and makes the switch more compact as a whole. The stationary contact terminal 4 is fixed in the hollow shell 1 above the moving contact spring 5. The moving contact spring 5 has a plurality of circumferentially arranged elastic contact arms 51, which are tilted upward to form a contact fit with the stationary contact terminal 4. The end of the elastic contact arm 51 is pre-adjusted to exceed the height of the stationary contact terminal 4 so that it is elastically pressed against the corresponding stationary contact terminal 4. The corresponding position can maintain a good contact state, reduce elastic fatigue caused by material embrittlement, and ensure the stability and reliability of the contact connection in a low temperature environment.

[0021] The end of the elastic contact arm 51 forms a bent end 52, which bends downward to form an arc shape. The bent end 52 contacts the stationary contact terminal 4, and its shape helps the elastic contact arm 51 to switch between the stationary contact terminals 4 more smoothly, further reducing the stuck phenomenon.

Claims

1. A car ceiling light push button switch, comprising a hollow housing (1), an operating button (2), a cam follower (3) and a plurality of stationary contact terminals (4), wherein the operating button (2) comprises ratchet teeth (21) extending in a circumferential direction and being movable up and down in an axial direction, and the stationary contact terminals (4) are fixedly mounted on the hollow housing (1), characterized in that: The hollow shell (1) is provided with a mounting hole (11) that passes through the inside and outside. The outer peripheral surface of the operating button (2) is provided with a plurality of circumferentially arranged convex ribs (22). The length direction of the convex ribs (22) is arranged along the axial direction of the operating button (2). The operating button (2) is movably arranged in the mounting hole (11). The surface of the convex ribs (22) slidably contacts the inner wall of the mounting hole (11) to form a gap (23) between the outer peripheral surface of the operating button (2) and the inner wall of the mounting hole (11). The gap (23) is filled with grease.

2. The automotive dome light push button switch according to claim 1, characterized in that: The convex ribs (22) extend toward the ratchet teeth (21) and each convex rib (22) corresponds to a ratchet tooth (21) to form an integral connection, and a through gap (23) and a lubrication groove (24) inside the hollow housing (1) are formed between adjacent ratchet teeth (21).

3. The automotive dome light push button switch according to claim 1 or 2, characterized in that: A moving contact spring (5) is fixedly mounted on the cam follower (3); the moving contact spring (5) is annular and is sleeved on the cam follower (3); the stationary contact terminal (4) is fixed in a hollow housing (1) above the moving contact spring (5); the moving contact spring (5) has a plurality of circumferentially arranged elastic contact arms (51); the elastic contact arms (51) are tilted upward to form contact with the stationary contact terminal (4).

4. The automobile dome light push button switch according to claim 3, characterized in that: The end of the elastic contact arm (51) forms a bent end (52), and the bent end (52) bends downward to form an arc shape.

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