JP2005104214A - Stop lamp switch - Google Patents

Abstract

An object of the present invention is to provide a stop lamp switch that controls turning on / off of a stop lamp in conjunction with an operation of a brake pedal of an automobile, and is excellent in oil resistance, easy to assemble, and inexpensive.
A switch case having a built-in fixed contact, an operating body having an operating shaft that is slidably fitted to a cylindrical portion that extends outward from an end of the switch case, and the operating body. In a stop lamp switch that includes a movable contact 27 and the switch 21 is opened and closed by separating the movable contact 27 from the fixed contact 17 by sliding the operation shaft 21 back and forth along the cylindrical portion 13, the operation shaft 21 has an outer periphery. A groove 23 is provided on the surface.
[Selection] Figure 1

Description

  The present invention relates to a stop lamp switch that controls turning on and off of a stop lamp mainly in conjunction with operation of a brake pedal of an automobile.

In recent years, a push operation type stop lamp switch is often used that turns on a stop lamp when the brake pedal is depressed and turns off the stop lamp when the brake pedal is released.
Representative examples of the press operation type stop lamp switch include a switch case having a fixed contact, an operating body having an operating shaft slidably fitted to a cylindrical portion protruding outward from the switch case, and the operating body. It is comprised from the movable contact attached to the part located in the switch case. Then, the top of the operating shaft protruding from the cylindrical portion is linked to an arm that is interlocked with the operation of the brake pedal, and slides back and forth on the cylindrical portion, so that the switch is operated by separating the movable contact and the fixed contact. Open and close.
For example, Patent Document 1 is known as related prior art information.
Japanese Patent Publication No. 6-101272

This type of push-type stop lamp switch is installed in the vicinity of a brake pedal where lubricating oil is used, so that the lubricating oil flows into the switch through the gap between the operating shaft of the operating body and the cylindrical portion that guides it. there's a possibility that. In order to prevent this, the end portion of the cylindrical portion and the operation shaft is usually covered with a rubber cap or the like. However, when such a movable part is covered with a rubber cap or the like, there is a problem that the assembly of the stop lamp switch becomes complicated, and it takes time to manufacture the switch, which is expensive.
In addition, as described in Patent Document 1, it is conceivable to provide a seal and seal the switch part. However, the structure of the stop lamp switch becomes complicated and expensive.
An object of the present invention is to provide an inexpensive stop lamp switch that is excellent in oil resistance, easy to assemble, and inexpensive.

A stop lamp switch according to the present invention includes a switch case having a built-in fixed contact, an operating body having an operating shaft slidably fitted to a cylindrical portion extending outward from an end of the switch case, and a switch of the operating body A stop lamp switch having a movable contact mounted on a portion located in a case, and opening and closing the switch by separating and connecting the movable contact and the fixed contact when the operation shaft slides back and forth on the cylindrical portion The operating shaft has a groove on the outer periphery.
According to the present invention, when lubricating oil or the like enters the gap between the tube portion and the operating shaft, the lubricating oil or the like is collected in a groove provided on the outer periphery of the operating shaft, and can be prevented from flowing into the switch case. . Therefore, it is possible to obtain an inexpensive stop lamp switch that is excellent in oil resistance and easy to assemble.

  The operating shaft preferably has a plurality of grooves spaced apart in the axial direction. According to this configuration, since the amount of oil that can be accumulated in the groove is increased, the oil resistance can be improved. Further, if the distance between the grooves is larger than the movement amount of the operation shaft, the oilproofness can be further improved.

  Moreover, it is preferable that the base part of the said cylinder part has a hole which connects inside and outside. According to this configuration, since the oil overflowing from the groove can be discharged to the outside at the base portion of the cylindrical portion, the inflow of oil into the switch case can be more effectively suppressed.

  According to the present invention, it is possible to obtain an inexpensive stop lamp switch that is excellent in oil resistance, easy to assemble.

Hereinafter, the stop lamp switch according to the present invention will be described with reference to FIGS.
FIG. 1 is a longitudinal sectional view of a stop lamp switch in one embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof.
The switch case 10 is composed of a case main body 11 made of an electrically insulating synthetic resin and a metal cover 12 covering the upper opening of the case main body 11, and the cover 12 has a cylindrical portion 13 protruding upward. A pair of fixed terminal plates 16 are fixed to the case body 11 by being inserted from above. The fixed terminal plate 16 is bent in an L shape so that the upper end protrudes toward the center of the case body, a fixed contact 17 is attached to the bent portion, and the lower end is a terminal located in the lower opening of the case body 11. It becomes part 18. A plurality of, for example, three holes 19 are provided in the base portion of the tube portion 13 of the cover 12 to communicate the inside and outside of the tube portion.

  On the other hand, the movable terminal plate 26 having the movable contact 27 made of a highly conductive metal such as a copper alloy is arranged so that the movable contact 27 is elastically contacted with the fixed contact 17 by being pushed upward by the pressure contact spring 24. . The spring 24 that presses the movable terminal plate 26 is installed so as to be fitted to a cylindrical portion 15 provided at the upper center of the partition wall 14 that partitions the inside of the case body 11 up and down. A return spring 25 that pushes up the operating body 20 is attached to the concave portion at the center of the cylindrical portion 15.

  The operating body 20 is formed of an electrically insulating synthetic resin into a hollow cylindrical shape with the top closed, and has an operating shaft 21 that is slidably fitted into the cylindrical portion 13 of the cover 12, and a lower portion thereof. The upper portion of the spring 25 is fitted and attached, and the protrusion 22 is fitted to the central portion having the hole 28 of the movable terminal plate 26. The operation shaft 21 has a groove 23 on the outer periphery thereof. In the illustrated example, a plurality of grooves 23 are provided so as to go around the outer periphery of the operation shaft, that is, in an annular shape, and there is an interval between the grooves that is larger than the distance to move up and down the operation shaft 21 described later.

  The stop lamp switch is assembled as follows, for example. First, the operating shaft 21 of the operating body 20 is fitted into the cylindrical portion 13 of the cover 12, and the spring 25 and the movable terminal plate 26 are combined with the operating body 20. On the other hand, the fixed terminal plate 16 and the spring 24 are attached to the case body 11, the case body 11 is combined with the cover 12, and the upper opening of the case body 11 is fitted into the lower opening of the cover 12. Thus, the stop lamp switch as shown in FIG. 1 is assembled.

  In the state of FIG. 1, the operating body 20 is completely inserted into the cylindrical portion 13 by the return spring 25, and the top of the operating shaft 21 protrudes upward from the cylindrical portion 13. The movable terminal plate 26 is pushed upward by the elasticity of the spring 24, and the movable contact 27 is in contact with the fixed contact 17 of the fixed terminal plate 16.

The stop lamp switch configured as described above is generally mounted in front of a brake pedal of an automobile, and a connector connected to a stop lamp (not shown) is mounted on the terminal portion 18 of the fixed terminal plate 16.
In a state where the brake pedal is not depressed, the operation shaft 21 of the operating body 20 is pressed by the arm of the brake pedal and retracted, as shown in FIG. That is, when the operating shaft 21 is pressed, the operating body 20 compresses the spring 25 and moves downward, and the protrusion 22 of the operating body 20 is fitted into the central portion having the hole 28 of the movable terminal plate 26. Then, the movable terminal plate 26 is moved downward against the spring 24. As a result, the movable contact 27 of the movable terminal plate 26 is separated from the fixed contact 17 of the fixed terminal plate 16. When the connection between the pair of fixed terminal plates 16 is disconnected in this way, the stop lamp is turned off.

  Next, when the brake pedal is depressed, the arm of the brake pedal is separated from the operation shaft and the pressing force on the operation shaft 21 is released, so that the operation shaft 21 is moved upward by the return spring 25 as shown in FIG. Accordingly, the movable terminal plate 26 is pushed up by the spring 24, the movable contact 27 is brought into elastic contact with the fixed contact 17, and the stop lamp is turned on.

  A conventional stop lamp switch of this type has a configuration as shown in FIG. Therefore, as described above, when the operation shaft 41 slides back and forth in conjunction with the arm of the brake pedal, if the lubricating oil or the like adheres to the tube portion 33 of the cover 32 or the operation shaft 41, the tube portion There is a possibility that lubricating oil may enter the gap between the control shaft 33 and the operation shaft 41, and if it flows into the switch case, it will adhere to the fixed contact or the movable contact. In FIG. 5, the same elements as those in FIG.

  On the other hand, in the stop lamp switch according to the present embodiment, when lubricating oil or the like adheres to the cylinder portion 13 or the operation shaft 21 of the cover 12 from a brake pedal or the like, as shown in FIG. There is a possibility that the lubricating oil 29 enters the gap between the cylindrical portion 13 and the operation shaft 21. This lubricating oil accumulates in a groove 23 formed on the outer periphery of the operation shaft 21. For this reason, lubricating oil does not flow into the switch case 10 which accommodates the terminal board which has a contact by flowing between the cylinder part 13 and the operating shaft 21 at a stretch.

Since a plurality of grooves 23 are formed, even when the lubricating oil flows downward due to the vertical movement of the operation shaft 21 accompanying the brake operation, as shown in FIG. 4B, the groove 23 is accumulated in the lower groove portion. Therefore, inflow into the switch case 10 can be prevented. Further, as shown in the drawing, when the distance between the grooves is larger than the movement distance of the operation shaft 21, the flow of the lubricating oil due to the vertical movement of the operation shaft 21 accompanying the brake operation can be suppressed.
Further, since the cover 12 is provided with the hole 19 in the base part of the cylinder part 13, the lubricating oil overflowing from the plurality of grooves 23 can be discharged to the outside from the hole.

As described above, according to the present embodiment, since the groove 23 is provided on the outer periphery of the operation shaft 21 of the operating body 20 that is slidably fitted to the cylinder portion 13, the groove 23 is inserted between the cylinder portion 13 and the operation shaft 21. The lubricating oil to be collected can be accumulated in the groove 23 to suppress the inflow into the switch case. Therefore, it is excellent in oil-proofing property, and does not require extra parts such as a rubber cap, so that it is easy to assemble and an inexpensive stop lamp switch can be obtained.
Further, by providing a plurality of grooves 23 provided on the outer periphery of the operation shaft 21, the oil resistance can be further improved. Furthermore, by providing the hole 19 in the base part of the cylinder part 13, the lubricating oil that overflows and flows down from the groove 23 can be discharged to the outside, and the inflow into the case can be suppressed.

  In the above embodiment, the switch case is formed by the portion of the case body 11 and the cover 12 covering the case body, and the fixed contact is attached to the case body 11. However, the cover 12 is made of synthetic resin, A fixed contact may be attached in the lower opening. The groove provided on the outer periphery of the operation shaft 21 is not necessarily annular, and may be divided into a plurality of pieces, for example. Such grooves are preferably provided in a plurality of stages so as to be spaced apart in the axial direction of the operation shaft and so that the divided portions do not overlap in the axial direction. In addition, it is preferable that three or four holes provided in the root portion of the cylindrical portion 13 are provided substantially uniformly on the outer periphery of the cylindrical portion.

  Since the stop lamp switch according to the present invention is excellent in oil resistance, is easy to assemble and is inexpensive, it is useful mainly for controlling the turning on / off of the stop lamp in conjunction with the operation of the brake pedal of the automobile.

It is a longitudinal cross-sectional view of the stop lamp switch in one Example of this invention. It is a disassembled perspective view of the same stop lamp switch. It is a longitudinal cross-sectional view at the time of pressing operation of the stop lamp switch. It is sectional drawing of the principal part explaining operation | movement of the stop lamp switch. It is a longitudinal cross-sectional view of the conventional stop lamp switch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Switch case 11 Switch case main body 12 Cover 13 Cylinder part 16 Fixed terminal board 17 Fixed contact 19 Hole 20 Actuator 21 Operation shaft 23 Groove 24 Pressure contact spring 25 Return spring 26 Movable terminal board 27 Movable contact 29 Lubricating oil

Claims (3)

  A switch case having a built-in fixed contact, an operating body having an operating shaft slidably fitted to a cylindrical portion extending outward from an end portion of the switch case, and a portion of the operating body located in the switch case A stop lamp switch that opens and closes the switch by separating and moving the movable contact and the fixed contact by sliding the operation shaft back and forth on the cylindrical portion, and the operation shaft is Stop lamp switch with a groove on the outer periphery.   The stop lamp switch according to claim 1, wherein the operating shaft has a plurality of grooves spaced apart in the axial direction.   The stop lamp switch according to claim 1, wherein a hole that communicates the inside and the outside is provided in a base portion of the cylindrical portion.

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