KR100668890B1 - Parking brake switch of vehicles - Google Patents

Abstract

A parking brake switch of a vehicle is provided to prevent damage by vibration of the vehicle by integrally forming a connector with a base plate of a switch cover and omitting a lead wire, and to improve reliability and durability thereof by interrupting inflow of moisture. A parking brake switch of a vehicle comprises a switch body(30), a diaphragm(32), a plunger(34), a contact plate(35), a switch cover(37), a driving contact point assembly(40), and a base plate unit(38). The switch body is connected to an air exhaust pipe through an air outlet(31). The diaphragm is operated by air pressure through the air outlet. The plunger is moved up and down according to the operation of the diaphragm, in contact with an upper surface of the diaphragm. The contact plate is disposed at a distance from an upper part of the plunger. The switch cover is connected to an upper part of the switch body, and has an air exhauster. The driving contact point assembly has a driving contact point(45) and is movable up and down by the pressure at the air outlet. The base plate unit is disposed at an upper part of the switch cover and integrally formed with the connector.

Description

PARKING BRAKE SWITCH OF VEHICLES}

1 is a view showing the structure of a conventional parking brake switch.

2 is an operation diagram of a conventional parking brake switch.

3 is a cross-sectional view of a vehicle brake switch according to the present invention.

4 is a view showing a movable contact assembly according to the present invention.

5A and 5B are cross-sectional views illustrating on / off states of a vehicle brake switch according to the present invention, respectively.

* Explanation of symbols for the main parts of the drawings

30: switch body 31: air inlet

32: diaphragm 34: plunger

34a: fixing groove 35: contact plate

37: switch cover 38: base plate

40: movable contact assembly 41: lower fixing plate

41a: spring fixing portion 41b: base portion

41c: protrusion 42: upper fixing plate

44: spring 45: movable contact

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking brake switch for a vehicle, and more particularly relates to a parking brake switch for a vehicle in which moisture inflow into the switch can be effectively prevented and parts reliability and durability are improved.

In general, the parking brake switch is a switch that is mounted on the air brake device air line of a commercial vehicle such as a bus or a truck to sense the air pressure below the prescribed.

The parking brake switch is configured to turn on the contact when the air pressure drops below a certain level, and the warning light is turned on by the on of the switch contact, and the buzzer sounds to warn the driver that the air pressure is off.

1 is a view showing the structure of such a conventional parking brake switch.

Referring to the drawings, the switch is coupled to the body 10 and the switch cover 15 to form a main body of the low air pressure switch, the inside of the diaphragm operable according to the pressure of the air transmitted through the air inlet 21 (11) and the movable contact plate 13 which is elastically supported by the spring 14 in cooperation with the diaphragm 11 is disposed, the contact plate 12 in the opposite side of the direction in which the movable contact plate 13 moves Is arranged to form a contact selectively on / off with the movable contact plate 13.

Air inlet and outlet 21 is connected to the air tank through the air line of the vehicle is a passage for the air input and output, the diaphragm 11 is a switch contact in accordance with the pressure state of the air entered through the air entrance 21 On / off, the spring 14 determines the pressure of the switch.

On the other hand, the rear end of the switch cover 15 is equipped with an air vent block 19 having an air vent hole 22 formed therein, and a screw assembly 24 is fastened to the air vent block 19, where a wiring connection is made. The member 26 is connected to the terminal cap assembly 28 of the connector 17. The connector 17 is to be connected to the wire harness 29 of the vehicle in a lead wire type.

Accordingly, the power applied to the movable contact plate 13 is the terminal cap assembly 28 of the connector 17, the wiring connecting member 26, the screw assembly 24, the air vent block 19, the spring 14 Will take the path leading to.

The contact plate 12 may be grounded to the vehicle body side through the contact cup 20 and the switch body 10 to form a conductive circuit.

Therefore, when air above the prescribed pressure enters through the air inlet 21, the diaphragm 11 is pushed backward, and the movable contact plate 13 and the contact plate 12 are separated, and the switch is turned off, and air below the operating pressure is released. When the contact flakes 12 and the plunger 13 comes into contact with each other to form an on contact, the warning light and the buzzer will operate.

The waterproof rubber cap 23 is coupled to the outside of the switch cover 15 to protect the inside of the switch and the wiring connection portion, and prevents moisture from penetrating.

However, such a conventional parking brake switch has a possibility that the lead wire portion may be suddenly bent when the vehicle is mounted, causing moisture to penetrate between the waterproof rubber cap and the wire to corrode the contact point. There was a problem that switch malfunction occurs frequently when the connection to the corrosion occurs or the painting is excessive.

In addition, according to the conventional structure, as shown in FIG. 2, the movable contact plate 13 is movable in left and right directions so that the end of the movable contact plate 13 is stuck under the contact plate 12 so that the contact function is lost. This is happening.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a parking brake switch for a vehicle in which water inflow into the switch can be effectively prevented and parts reliability and durability are improved.

In order to achieve the above object, the vehicle parking brake switch according to the present invention, the switch body is connected to the air pipe side through the air entrance; A diaphragm that intersects an end side of the air inlet and operates according to the pressure of air through the air inlet; A plunger which contacts an upper surface of the diaphragm and moves up and down according to the operation of the diaphragm; A contact plate installed on an upper side of the diaphragm and having an upper end spaced apart from an upper portion of the plunger; A switch cover coupled to an upper portion of the switch body and having an air outlet; A movable contact assembly installed between an inner top surface of the switch cover and the plunger, the movable contact plate having a movable contact plate contactable with the contact plate, the movable contact assembly being movable in accordance with an air inlet pressure applied through the plunger; And a base plate portion formed at an upper portion of the switch cover and integrally formed with the connector.

Here, the movable contact assembly comprises an upper fixing plate coupled to the inner top surface of the switch cover; A spring having an upper end fixed to a lower surface of the upper fixing plate; Located in the upper surface of the plunger and the movement hole between the contact plate is provided with a base portion in which the outer peripheral surface is located and a spring fixing portion for fixing the lower end of the spring to the upper surface located above the base portion, the upper surface of the base portion It is configured to include a lower fixing plate that is provided with the annular movable contact to the outer peripheral side of the fixing portion

Here, the spring is composed of at least three coil springs arranged at equal intervals, a fixing groove is formed on the upper surface of the plunger, a protrusion is formed on the lower surface of the base portion is positioned so that the protrusion is inserted into the fixing groove. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a cross-sectional view of a vehicle brake switch according to the present invention, Figure 4 is a view showing a movable contact assembly according to the present invention, Figures 5a and 5b are respectively shown the on / off state of the vehicle brake switch according to the present invention It is sectional drawing.

3 and 4, a switch cover 30 having an air inlet and outlet 31 of a parking brake switch according to the present invention, and a switch cover coupled to the switch body 30 to form a main body of the parking brake switch. (37).

The inner lower surface of the switch body 30, the diaphragm 32 is installed on the end side of the air inlet and outlet 31, and configured to operate in accordance with the pressure of air transmitted through the air inlet and outlet 31, the diaphragm 32 The upper surface of the plunger 34 is provided with elastic support between the movable contact assembly 40 and the diaphragm 32.

A contact plate 35 is provided above the plunger 34, and the contact plate 35 is configured to be in contact with the movable contact 45 formed in the movable contact assembly 40 described later as a fixed contact.

The movable contact assembly 40 installed inside the switch cover with the upper surface of the plunger 34 has a lower fixing plate 41 having a lower surface supported by the plunger 34 and an upper fixing plate 42 fixed at an upper side of the inner side of the switch cover. At least four coil springs 44 which are arranged at equal intervals between are included.

According to the embodiment of the present invention is composed of four coil springs 44 arranged at equal intervals with a plurality of coil springs 44 to maintain a stable balance of power during switch operation. This coil spring 44 serves to determine the operating pressure of the switch during switch operation.

The lower fixing plate 41 has a larger diameter than the spring fixing portion 41a at the lower portion of the spring fixing portion 41a and the lower portion of the spring fixing portion 41a where the lower end of the spring 44 is fixed. It is provided with a base portion 41b of a disk-like lifting up and down along the moving hole 36 formed in the center of the 35 is inserted into the fixing groove 34a formed on the upper surface of the plunger 34 to the lower end of the base portion 41b The protrusion part 41c is provided.

Since the protrusion 41c formed at the lower end of the base portion 41b is inserted into the fixing groove 34a on the upper surface of the plunger 34, the horizontal movement between the plunger 34 and the lower fixing plate 41 is limited. Since the base portion 41b moves along the movement hole 36 in the center of the contact plate 35, the two members 34 and 41 are configured to move only up and down together.

Since the base portion 41b and the spring fixing portion 41a have different diameters, the upper surface of the base portion 41b forms a stepped surface. An annular movable contact 45 is attached to the upper surface of the base portion 41b. . The movable contact 45 extends to the outer circumferential side thereof so that the side end side thereof can contact the contact plate 35 forming the fixed contact, and moves downward with the movable contact assembly 40 to move up and down. ) Contact or contact with the switch circuit.

On the other hand, the base plate portion 38 is formed on the upper end of the switch cover 37, the base plate portion 38 is formed of a waterproof connector integrated structure. In addition, the air outlet 39 to allow the air in the switch cover inner space to be discharged is configured to solve the conventional problem that the water flows into the inside by the rubber cap corrosion by setting to the waterproof connector side. This makes it possible to block external moisture ingress and improve component durability and reliability.

The waterproof connector of the base plate portion 38 is connected to a wire harness (not shown) of the vehicle, and the two terminal terminals of the waterproof connector are connected to the contact plate through leads, respectively. Each of the terminal portions is connected to the lead, respectively, with two terminal portions positioned toward each other.

Due to this configuration, when the contact plate and the movable contact come into contact with each other, the movable contact acts as a switch terminal, thereby conducting between the two terminal portions, whereby the parking brake switch is turned on.

Further, as another example, one terminal terminal of the waterproof connector of the base plate portion 38 is connected to the contact plate through the lead, and the other terminal terminal is connected through the upper fixing plate, the spring, the spring fixing portion, the movable contact In this case, the contact plate and the movable contact may be configured to conduct current.

Hereinafter, the operation of the embodiment of the present invention will be described with reference to FIGS. 5A and 5B.

First, referring to FIG. 5A, when air above a prescribed pressure enters through the air inlet 31, the diaphragm 32 and the plunger 34 are pushed upward while compressing the spring 44 by the pressure at this time. At this time, since the movable contact 45 of the movable contact assembly 40 is also pushed upward together, the contact plate 35 and the movable contact 45 are separated from each other, so that the switch maintains an off state.

However, less than the prescribed air pressure acts through the air inlet 31, and the diaphragm 32 and the plunger 34 are pushed downward by the force of the spring 44, and as shown in FIG. 5B, the contact plate 35 and the movable contact 45 contact, and the parking brake switch is turned on.

As such, when the brake switch is turned on, a warning light and a buzzer are operated while current flows through two terminal terminals of the waterproof connector of the base plate unit 37.

Although the present invention described above has been described in detail with reference to specific preferred embodiments, various modifications may be made by those skilled in the art to which the present invention pertains without departing from the spirit or scope of the present invention. . The appended claims are intended to cover such various modifications as well as the above-described embodiments.

According to the parking brake switch of the present invention, the lead wire is removed and the connector is integrated when forming the base plate portion of the switch cover to prevent burnout caused by vehicle vibration and to prevent external moisture from entering, thereby improving component reliability.

In addition, the contact of the diaphragm according to the present invention can be prevented from flowing left and right to improve the stability of the contact, it is possible to prevent the phenomenon that the contact occurs early wear due to sparks caused by the contact flow.

In addition, according to the present invention, a plurality of coil springs are fixed between the plates to prevent the spring from bending and thereby generating contact sparks.

Claims (4)

A switch body 30 connected to the air pipe side through the air inlet and outlet 31; A diaphragm 32 which intersects an end side of the air inlet 31 and operates according to the pressure of air through the air inlet 31; A plunger (34) contacting the upper surface of the diaphragm (32) to move up and down in accordance with the operation of the diaphragm (32); A contact plate 35 installed above the diaphragm 32 and having an upper end spaced apart from an upper portion of the plunger 34; A switch cover 37 coupled to an upper portion of the switch body and having an air outlet; An air inlet and outlet provided between the upper end surface of the switch cover 37 and the plunger 34, the movable contact 45 being in contact with the contact plate 35, and applied through the plunger 34. (31) a movable contact assembly 40 which is movable in accordance with pressure; And The vehicle parking brake switch, characterized in that it comprises a base plate portion 38 formed in the upper portion of the switch cover 37 and integrally formed with the connector. The method of claim 1, The movable contact assembly 40 An upper fixing plate 42 coupled to an inner top surface of the switch cover 37; A spring 44 having an upper end fixed to a lower surface of the upper fixing plate 42; Located on the upper surface of the plunger 34 and located in the upper portion of the base portion 41b and the base portion 41b whose outer circumferential surface is located in the movement hole 36 between the contact plate 35 and the spring 44 on the upper surface. A lower fixing plate having a spring fixing portion 41a to which a lower end of the bottom portion is fixed, and an annular movable contact 45 being installed on the outer circumferential side of the spring fixing portion 41b to an upper surface of the base portion 41b ( 41) Vehicle parking brake switch, characterized in that comprising a. The method of claim 2, The spring 44 is a vehicle parking brake switch, characterized in that consisting of at least three coil springs arranged at equal intervals. The method of claim 2, A fixing groove 34a is formed on an upper surface of the plunger 34, and a protrusion 41c is formed on a lower surface of the base portion 41b so that the protrusion 41c is inserted into and positioned in the fixing groove 34a. Parking brake switch for a vehicle, characterized in that.

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