JPH09265859A - Switch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a switch device for use an the shift position detecting switch of a manual transmission, etc., to operate stably over a long period. SOLUTION: A push rod 2 holding a sphere 21 at its end is slidably provided inside a case 1 mounted on the housing 9 of a manual transmission, a terminal 4 constituting a fixed contact 41 is provided on a pole plate 3 secured to the case 1, and a plunger 5 having a movable contact 61 is slidably provided on the pole plate 3. A diaphragm 7 is mounted between the push rod 2 and the plunger 5, and the space formed by the case 1 and the pole plate 3 is partitioned into a chamber facing the push rod 2 and a chamber facing the plunger 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch device, and more particularly to outputting a neutral position detection signal for performing idle control of an engine in a manual transmission,
The present invention relates to a switch device suitable for a shift position detection switch that outputs a reverse position detection signal for performing lighting control of a back lamp.

[0002]

2. Description of the Related Art As a conventional shift position detecting switch, for example, the one shown in Japanese Utility Model Laid-Open No. 57-50919 is known. In this case, a push rod that moves in response to a shift operation is slidably held in a case attached to a housing of a manual transmission, and is turned on by a movable contact provided on the push rod and a fixed contact provided on a pole board. It is designed to be turned off. Incidentally, as a conventional technique, there is one using a diaphragm, which is constituted by a touch type contact.

[0003]

However, in the switch having the above structure, the case is fixed to the housing of the transmission in which lubricating oil is sealed, and the push rod slides with respect to the case. , The contact part of the switch is immersed in the lubricating oil in the transmission that has entered from the sliding part, and the contact part wears due to deterioration of the lubricating oil or the influence of the additive in the lubricating oil, and the durability is not always guaranteed. There was a problem that it was not enough.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a switch device which is stable in operation for a long period of time and has a sliding contact structure.

[0005]

In order to achieve the above object, the switch device of the present invention according to claim 1 comprises a case, a push rod slidably attached to the case,
A pole plate fixed to the case and having a fixed contact extending in the axial direction, a plunger slidably held on the pole plate, and a movable contact mounted on the plunger and sliding on the fixed contact.
It is characterized in that a space provided between the push rod and the plunger and formed by the case and the pole plate is configured by a diaphragm that divides the space into a chamber on the push rod side and a chamber on the plunger side.

Further, the switch device of the present invention according to claim 2 is characterized in that the push rod is made of resin and has a metallic sphere at its tip.

Further, the switch device of the present invention according to claim 3 is characterized in that the case has a recessed stopper surface on which a stopper portion protruding from the rear end of the push rod abuts.

Further, in the switch device of the present invention according to claim 4, a rod extending in the axial direction is projectingly provided on the plunger.
The pole board is characterized in that a cylindrical portion into which the rod is slidably fitted is provided in a protruding manner.

With the above structure, in the switch device according to the first aspect, the contact portion is isolated from the room on the push rod side by the diaphragm. Therefore, even when the contact portion is used as a shift position detection switch of a manual transmission, for example, It is isolated from the lubricating oil and is located in the atmosphere, so it is not affected by the lubricating oil.

Further, in the switch device according to the second aspect of the present invention, a switch device which is inexpensive and has little wear can be obtained by combining the push rod made of resin and the spherical body made of metal.

According to the third aspect of the present invention, the switch device has a recessed stopper surface on which the stopper of the push rod abuts, so that the axial length of the switch can be shortened and the protrusion amount from the housing of the transmission is small. You can do it.

In the switch device according to the fourth aspect, the plunger rod and the cylindrical portion of the pole plate constitute a guide member for sliding the plunger, whereby the movement of the plunger can be made smooth.

[0013]

FIG. 1 shows an embodiment in which the switch device of the present invention is used as a shift position detecting switch. FIG. 1 is a cross-sectional view showing the contact in an ON state, and FIG. 2 is in the OFF state. It is sectional drawing of a state. In the figure, 1 is a case attached to a housing 9 of a manual transmission, 2 is a push rod slidably provided on the case 1, 3 is a cylindrical pole plate which is caulked and fixed to the case 1, and 41 is a pole plate. Pole board 3
The fixed contacts of the terminal 4 provided on the base plate 5, the plunger 5 sliding in the pole plate 3, 61 the movable contact of the leaf spring 6 provided on the plunger 5, and 7 the diaphragm. In addition, 8
Is a shifter rail that moves in response to a shift operation of the manual transmission, and this shifter rail 8 has a cam surface 8a on its side surface.

As shown in FIG. 3, the case 1 has a small diameter portion 1
1 and a large-diameter portion 12 are made of metal, and the small-diameter portion 11
On the outer periphery, a male screw 1 that is screwed into the housing 9 of the manual transmission
1a is formed. A through hole 13 having a circular cross section extending in the axial direction is formed in the center of the case 1, and the first recess 14 and the first recess 1 are provided on the large diameter portion 12 side.
Second recess 15 having a diameter slightly smaller than 4 and second recess 15
A third recess 16 having an intermediate diameter between the through hole 13 and the through hole 13 is formed, and the bottom surface of the third recess 16 is located inside the small diameter portion 11. The large-diameter portion 12 has a hexagonal outer shape and has a thin flange 12a at the end.

The push rod 2 is a hollow resin member, and a metallic sphere, specifically, a commercially available steel ball 21 for ball bearing is held at the tip end thereof, and a diameter is expanded at the rear end thereof. The stopper portion 22 is integrally formed. The diameter of the stopper portion 22 is smaller than that of the third recess 16 of the case 1, and the bottom surface of the third recess 16 is in contact with the stopper surface 16a. As shown in FIG. 4, the hollow portion 23 of the push rod 2 is a mark of the pin P that holds the sphere 21 in the molding die K when the sphere 21 is insert-molded at the tip of the push rod 2.

As shown in FIGS. 5A and 5B, the pole plate 3 is a cylindrical resin member having a hole 31 of circular cross section extending from one end in the axial direction. Four rectangular notches 32, 32, 33, 33 at displaced positions
In addition, a cylindrical portion 34 extending in the axial direction is provided on the bottom surface of the hole 31 so as to project. Also, the outer shape of the pole board 3 is the case 1
Has a large-diameter portion 35 that fits into the first recess 14 of the case 1 at a position separated by a predetermined dimension from the opening end side that is inserted into the second recess 15, and has a connector portion 36 on the rear end side. Has been formed.

The terminals 4 are opposite to each other 2 of the pole board 3.
One of the cutouts 32, 32 is insert-molded and one end thereof is axially exposed in the cutout 32 and the fixed contact 4 is formed.
1 and the other end 42 of the terminal 4 is connected to the connector portion 36.
It projects inside and is connected to an external connector terminal (not shown).

As shown in FIGS. 6 (a) and 6 (b), the plunger 5 slides in a cylindrical head portion 51 and notches 33, 33 in which the terminal 4 of the pole board 3 is not inserted. The movable contact 6 is a resin member including a bifurcated rectangular leg portion 52 and a cylindrical rod 53 that extends axially rearward from the rear end of the head portion 51 and that fits and slides on the cylindrical portion 34.
A substantially U-shaped leaf spring 6 having 1 is insert-molded. Incidentally, 54 is a seating surface of the spring 10 for urging the movable plate 5 from the hole 31 of the pole plate 3 in the protruding direction.

As shown in FIGS. 7 (a) and 7 (b), the diaphragm 7 is formed of an oil resistant rubber and is an outer peripheral bead portion sandwiched between the bottom surface of the second recess 15 of the case 1 and the end surface of the pole plate 3. 71 and a corrugated plate-shaped non-perforated member having a protrusion 72 formed in the center. The protrusion 72 is fitted into the hollow portion 23 formed in the push rod 2 so that it can be assembled at the time of assembly. The push rod 2 and the plunger 5 are accurately positioned and do not generate a twisting force.

In the shift position detecting switch having the above structure, the push rod 2 is inserted into the through hole 13 of the case 1, the protrusion 72 of the diaphragm 7 is fitted in the hollow portion 23 of the push rod 2 to position the spring. 10, Plunger 5
The pole board 3 in which the
The thin flange 12a of the case 1
Then, the large diameter portion 35 of the pole board 3 is swaged. At this time, since the plunger 5 is positioned in the pole plate 3 by the leg portion 52, the notch 33, the rod 53, and the cylindrical portion 34, the plunger 5 does not rotate or tilt in the pole plate 3, When the case 1 and the pole board 3 are swaged, the push rod 2, the diaphragm 7 and the diaphragm 7 which are slidably held therein.
The three members of the plunger 5 are correctly assembled with their respective axes aligned. When the pole board 3 is inserted into the case 1, the bottom surface of the first recess 14 and the large diameter portion 35 of the pole board 3 are inserted.
The contact with the end faces allows the two to be positioned in the axial direction, and the clamping force of the diaphragm 7 with respect to the outer peripheral bead portion 71 will not be too strong or too weak, and the diaphragm 7 can be stably held. The shift position detecting switch assembled as described above uses the hexagonal large diameter portion 12 of the case 1 to screw the male screw 11a of the case 1 into the female screw portion formed in the housing 9 of the manual transmission. To combine.

With the above structure, when the driver operates the transmission, the shifter rail 8 moves in the axial direction according to the shift operation, and the push rod together with the spherical body 21 rolling on the cam surface 8a of the shifter rail 8 accordingly. 2 goes back and forth. Then, in the forward movement state of the push rod 2 shown in FIG. 1, the leaf spring 6 together with the plunger 5 is pushed out toward the case 1 by the spring 10, and the movable contact 61 comes into contact with the fixed contact 41 to be in the ON state. At this time, since the stopper portion 22 of the push rod 2, the tip of the head portion 51 of the plunger 5, and the central portion of the diaphragm 7 are located inside the third recess 16 of the case 1, the switch corresponding to the depth of the third recess 16 is provided. The axis length of itself can be shortened.

When the push rod 2 is moved from the advanced state shown in FIG. 1 to the retracted state shown in FIG. 2 by the movement of the shifter rail 8, the push rod 2 resists the diaphragm 7 and the plunger 5 against the urging force of the spring 10. The movable contact 61 integrated with the plunger 5 slides back on the fixed contact 41 to reach the top of the pole board 3 and the contact is turned off. Since ON / OFF switching of this contact is a sliding type, stable operation can be performed for a long period of time by the cleaning action of the contact itself even when a minute current is used.

[0023]

According to the switch device of the present invention as set forth in claim 1, since the space formed by the case and the pole plate is divided into the push rod side chamber and the plunger side chamber by the diaphragm, the shift is performed. Even when used as a position detection switch, the contact part is located in the atmosphere because it is isolated from the lubricating oil inside the transmission, so it is not affected by the lubricating oil, contact wear is prevented, and it is stable over a long period of time. It is possible to secure the required operation.

Further, in the switch device of the present invention as defined in claim 2, by combining a resin push rod and a metal sphere, a switch that is lightweight, inexpensive and less wearable can be obtained, and the shifter rail can be used. Due to the presence of the sphere rolling on the push rod pushing member, it is possible to prevent a pushing force from acting on the push rod, and the operation of the switch can be made smooth and reliable.

Further, in the switch device of the present invention as defined in claim 3, since the case has a concave stopper surface on which the stopper of the push rod abuts, the axial length of the switch can be shortened, and the switch position detecting switch is used. Even in this case, the switch can be a switch with a small amount of protrusion from the housing of the transmission.

Further, in the switch device of the present invention as set forth in claim 4, the rod protruding from the plunger and the tubular portion of the pole plate constitute a guide member for sliding the plunger, thereby providing a push rod. Since the separate plunger can be held in a stable posture with respect to the pole board, the movement of the plunger is smooth and the operation of the switch can be ensured.

[Brief description of drawings]

FIG. 1 is a side view showing an ON state of an embodiment in which a switch device according to the present invention is applied as a shift position detection switch.

FIG. 2 is a cross-sectional view showing an OFF state of the same embodiment.

FIG. 3 is a partial cross-sectional view showing a case according to the same embodiment.

FIG. 4 is a cross-sectional view showing a molded state of the push rod in the same embodiment.

5A and 5B are diagrams showing a pole plate in the same embodiment, where FIG. 5A is a side view and FIG. 5B is a sectional view taken along line AA of FIG.

FIG. 6 is a view showing a plunger according to the same embodiment,
(A) is a side view, (b) is a front view.

FIG. 7 is a view showing a diaphragm in the same embodiment,
(A) is a front view, (b) is BB sectional drawing of (a).

[Explanation of symbols]

 1 Case 2 Push Rod 3 Pole Plate 5 Plunger 7 Diaphragm 8 Shifter Rail 16a Stopper Surface 21 Sphere 22 Stopper Part 34 Cylindrical Part 41 Fixed Contact 53 Rod 61 Movable Contact

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H01H 13/52 4235-5G H01H 13/52 B

Claims (4)

[Claims] 1. A case, a push rod slidably attached to the case, a pole plate having fixed contacts fixed to the case and extending in the axial direction, and a plunger slidably held by the pole plate. A space formed between the movable contact, which is attached to the plunger and slides on the fixed contact, and the case and pole plate, which is provided between the push rod and the plunger, is divided into a push rod side chamber and a plunger side chamber. A switch device characterized by being configured with a diaphragm. 2. The switch device according to claim 1, wherein the push rod is made of resin and has a metallic sphere at its tip. 3. The switch device according to claim 1, wherein the case has a stopper surface on which a stopper portion protruding from the rear end of the push rod abuts. 4. A plunger is provided with a rod extending in an axial direction, and a pole plate is provided with a cylindrical portion into which the rod is slidably fitted. The switch device according to claim 1.