CN100355000C - Structure for preventing other materials attaching on pedal switch - Google Patents

Abstract

The present invention provides a foreign matter adhesion preventing structure of a pedal switch, which can prevent foreign matter such as dust from adhering to a sliding portion of a plunger in the pedal switch without increasing the number of parts and assembly man-hours. On the stopper (9) that the front end of the plunger abuts against when the pedal lever (2) is not operated, there is provided a cover integrally formed with the stopper (9) to cover the guide member and the front end of the plunger, That is, the cup-shaped portion (9a). Therefore, when the pedal is not operated, the guide member and the front end of the plunger are always covered by the cover, so foreign matter such as dust can be prevented from adhering to the sliding portion of the plunger. In particular, since the cover and the stopper can be integrally formed, there is no increase in the number of parts and assembly man-hours.

Description

Structure to prevent the adhesion of foreign matter for pedal switches

technical field

The present invention relates to a structure for preventing the attachment of impurities for a pedal switch used for detecting the action state of a pedal.

Background technique

In order to make the brake indicator light provided at the rear of the car body linked with the brake pedal to light up, motor vehicles are equipped with a pedal switch that can detect that the brake pedal has been stepped down. The pedal switch is composed of a cover and a plunger, wherein the cover is assembled with a fixed contact and fixed on the side of the vehicle body, the plunger is movably fitted on a cylindrical guide part integrally formed with the cover, and Linked with the movable contact. The plunger protruding from the front opening of the guide member moves forward and backward in conjunction with the swing motion of the brake pedal, thereby making the fixed contact and the movable contact conductive or disconnected.

As the above-mentioned pedal switch, a sealing member made of a soft film is installed near the contact mounting part to prevent foreign matter such as dust from entering the contact part and causing poor contact (refer to Japanese Patent Publication No. 6-101272, Fig. 6).

Contents of the invention

However, the above-mentioned existing structure cannot play the role of preventing dust and the like from adhering to the plunger portion protruding from the guide member. Even when such a switch is assembled from small parts, when the sealing member is assembled inside, the number of parts and assembly man-hours increase, thereby increasing the manufacturing cost of the switch.

In order to solve this problem, the structure for preventing foreign matter from attaching to a pedal switch according to the first aspect of the present invention is used to detect the operating state of a freely swingable pedal supported on the side of the vehicle body. The freely slidable plunger supported by the guide member on the side of the vehicle body is characterized in that a stopper abuts against the front end of the plunger when the pedal lever is in an unoperated state. A cover is integrally formed on the stopper, and the cover covers the guide member and the front end portion of the plunger.

Moreover, in Claim 2 of this invention, the inner diameter dimension of the said cover is set so that a cover can accommodate the front-end|tip part of the said guide member loosely.

Moreover, in Claim 3 of this invention, the inner diameter dimension of the said cover is set larger than the outer diameter dimension of the front-end|tip part of the said guide member.

According to the present invention, since the guide member and the front end of the plunger are always covered by the cover when the pedal is not operated, foreign matter such as dust can be prevented from adhering to the sliding portion of the plunger. In particular, since the cover can be integrally formed with the stopper, it is not necessary to add an additional cover to the switch, resulting in no increase in the number of parts and assembly man-hours. In addition, since the inner diameter of the cover is made relatively large, the assembly of the stopper can be completed without being affected by the difference in positional accuracy among the components.

Description of drawings

Fig. 1 is a side view of the periphery of a brake pedal to which the present invention is applied.

Fig. 2 is a sectional view of a pedal switch to which the present invention is applied.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 shows the peripheral part of the brake pedal to which the present invention is applied.

The upper end of the pedal rod 2 of the brake pedal 1 is supported on the pedal bracket 4 through the pin 5. The pedal rod 2 of the brake pedal 1 can swing with the pin 5 as a fulcrum. The pedal bracket 4 is fixed between the driver's seat and the The inner face of the upper part 3 of the nacelle bulkhead. Moreover, the intermediate part of the pedal rod 2 is connected to the piston of the master cylinder which is not shown in figure.

On the upper position of the pedal bracket 4, a switch bracket 6 integrated therewith is provided, on which the pedal switch 7 of the present invention is installed.

A stop bracket 8 is welded to the side of the step bar 2 . A stopper 9 made of a soft rubber material is attached to the stopper bracket 8 at a position corresponding to the installation position of the pedal switch 7 .

As shown in detail in Fig. 2, the pedal switch 7 has the following components: open at both ends, and a cylindrical housing 12 that is provided with a partition 11 in the middle position in the axial direction; the opening on one side of the housing 12 is closed cover 13; a plunger 15 that can slide relative to a small-diameter cylindrical guide member 14, wherein the guide member 14 is integrally formed with the cover 13; a fixed contact 16 arranged on one side of the opening surface of the housing 12; The coil spring 17 elastically supports the movable contact 18 between the intermediate spacer 11 and the fixed contact 16; the coil spring 19 elastically loads the plunger 15 in the protruding direction; it is connected with the fixed contact 16 and is built in Terminal 20 on the other opening side of housing 12 .

In addition, the other open side of the housing 12 is used as a connection socket C to connect the fixed contact 16 with a brake indicator light circuit (not shown in the figure).

The plunger 15 is locked in the guide member 14, and its front end protrudes slightly outward from the opening of the guide member 14. When the plunger 15 is pressed inward by overcoming the elastic force of the coil spring 19, the movable contact 18 is pressed by the plunger. The inner end of the plug 15 is pushed to separate from the fixed contact 16, thereby cutting off the conduction of the switch.

The pedal switch 7 is fixed to the switch bracket 6 by screwing the external thread formed on the outer surface of the guide member 14 and the internal thread formed on the synthetic resin band 21 .

In this way, when the brake pedal 1 is not operated, the plunger 15 of the pedal switch 7 abutting against the stopper 9 arranged on the pedal rod 2 is pressed in, whereby the brake indicator light circuit is de-energized, The brake light goes off. And when the brake pedal 1 is stepped on, the stopper 9 leaves the front end of the plunger 15 to protrude the plunger 15, and the movable contact 18 contacts the fixed contact 16, so that the circuit of the brake indicator lamp is energized. The brake indicator light comes on.

One end of the stopper 9 is in the shape of an open cup, and its bottom wall 9 b is mounted on the stopper bracket 8 . When the brake pedal 1 is not operated, the front end of the plunger 15 abuts against the inner surface of the bottom wall 9b. The inside of the cup-shaped portion 9a can accommodate the plunger 15 and the front end of the guide member 14 loosely. In this way, when the inner diameter of the cup-shaped portion 9a is sized to loosely accommodate the front end of the guide member 14, the stopper 9 can be assembled without being affected by the difference in positional accuracy among the parts.

Due to the action of the stopper 9, when the brake pedal 1 is not operated, the open end of the guide member 14 and the front end of the plunger 15 are covered by being accommodated by the inner side of the cup-shaped portion 9a of the stopper 9. , so foreign matter such as dust can be prevented from adhering to the sliding portion of the plunger 15 .

During stepping on the brake pedal 1, although the opening end of the guide member 14 and the front end of the plunger 15 are in an exposed state, compared with the time when it is covered, its exposure time is much less, so it is exposed during exposure. The impact is almost negligible.

Although the present invention has been described in detail above by taking a switch with a so-called normally open contact as an example, that is, when the brake pedal 1 is not operated, the contact is in a normally open state, but the present invention is not limited to the above structure. When the brake pedal 1 is not operated, the normally closed contact switch of the form of contact normally closed is also applicable. In addition, in the above example, only the application example of the case where the contact is closed at the initial stage of the pedal stroke is given, but the present invention can also be applied to a switch with a structure such as a clutch interlock device, that is, only when the pedal is depressed at the maximum stroke The engine can only be started when the clutch pedal is pressed. In this structure, the contacts are closed when the pedal is depressed with the maximum stroke.

The foreign matter adhesion prevention structure for the pedal switch according to the present invention can prevent foreign matter such as dust from adhering to the sliding part of the plunger in the pedal switch without causing an increase in the number of parts and assembly man-hours, so , can be applied to the dust-proof structure of the plunger type limit switch, etc.

Claims (3)

1. A structure for preventing the attachment of foreign matter of a pedal switch, the pedal switch is used to detect the operating state of a freely swingable pedal supported on the side of the vehicle body, and it has a structure supported by a guide member fixed on the side of the vehicle body. , a freely slidable plunger, characterized by: A stopper abutting against the front end of the plunger when the pedal lever is not operated is provided, and a cover is integrally formed on the stopper, and the cover covers the guide member and the plunger. front end. 2. The foreign matter adhesion prevention structure of the pedal switch according to claim 1, wherein the inner diameter of the cover is set to a size that the cover can loosely accommodate the front end of the guide member. 3. The foreign matter adhesion prevention structure of the pedal switch according to claim 1, wherein the inner diameter of the cover is set larger than the outer diameter of the front end of the guide member.

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