JP2000090779A - Inhibitor switch structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inhibitor switch having a pole plate and a case fused by vibration fusing. SOLUTION: This inhibitor switch has a pole plate 1 formed by inserting a fixed contact plate and a movable contact 4 in contact with the fixed contact plate, and is equipped with a movable plate 3 forming a shaft 3a at its rotation center and a case 7 to be bored with a through hole 7a axially aligned with the shaft 3a. The shaft 3a of the movable plate 3 forms a large diameter part 3c to be engaged with an O ring 8, a small diameter part 3d to be engaged with a stopper 10 and a different level surface 3e between the small diameter part 3d and the large diameter part 3c. The stopper 10 is fitted between the small diameter part 3d and the through hole 7a and is fused to the different level surface 3e by ultrasonic fusing. The different level surface 3e of the movable plate 3 forms a recessed part 3f and the case 7 forms a circular projecting part 7b loosely fitted to the recessed part 3f. The peripheral part of the case 7 is fused to the pole plate 1 by vibration fusing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an inhibitor switch in which a contact is switched according to a shift operation position of an automatic transmission for an automobile.

[0002]

2. Description of the Related Art Conventionally, as this kind of technique, there is a technique disclosed in Japanese Utility Model Laid-Open No. 7-25537, for example. In the inhibitor switch of this technique, the movable platen and the movable arm are welded and integrated by an ultrasonic welding technique. A packing is interposed between the case and the pole plate and fixed with screws or the like.

[0003] The above-mentioned conventional inhibitor switch is assembled in the following order. First, as the first procedure,
Insert the shaft of the movable arm into the O-ring and the case.
As a second procedure, a movable plate is placed on the shaft of the movable arm,
Ultrasonic welding of the joint. As a third procedure, a contact spring and a movable contact are mounted on the movable plate. As a fourth procedure, a packing is mounted on the annular groove of the case, and the pole plate is put on the case, and both are fixed with screws or the like.

[0004]

The above-mentioned conventional inhibitor switch has a problem that the workability is poor because the case is sandwiched between the movable arm and the movable plate by ultrasonic welding. Further, in the inhibitor switch, when the case and the pole plate are to be subjected to ultrasonic welding in the above-mentioned step, the movable arm blocks the horn of the ultrasonic welding machine, and the entire periphery of the case is ultrasonically welded. There is a problem that can not be. Further, when the movable arm and the movable plate are ultrasonically welded in a state where the movable plate is sandwiched and supported by the case and the electrode plate, there is a problem that the shaft of the movable arm is ultrasonically welded to the electrode plate. .

An object of the present invention is to provide a structure of an inhibitor switch in which no packing is required and a case and an electrode plate are vibration-welded in a state where the movable plate is sandwiched and supported by the case and the electrode plate.

[0006]

SUMMARY OF THE INVENTION The invention according to claim 1 of the present invention has been made in order to solve the above-mentioned problems of the prior art, and comprises: a pole plate having a fixed contact plate inserted therein; An inhibitor switch having a movable contact having a movable contact in contact with a fixed contact plate and having a shaft formed at the center of rotation, and a case having a through-hole formed in the shaft. The shaft forms a large-diameter portion in which the O-ring fits, a small-diameter portion in which the stopper fits, and a step surface between the small-diameter portion and the large-diameter portion, wherein the stopper has the small-diameter portion. And the above-described through hole, and is ultrasonically welded to the step surface.

According to a second aspect of the present invention, in the first aspect of the present invention, the stepped surface of the movable plate forms a concave portion, and the case forms an annular protrusion that fits loosely into the concave portion. Become.

[0008] The invention of claim 3 provides the above-mentioned claim 1 or 2
In the invention described above, the case is obtained by vibration-welding the peripheral portion to the pole plate.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment of the present invention will be described in detail with reference to FIGS. Reference numeral 1 denotes a pole plate in which a fixed contact plate 2 made of a conductive metal plate and a metal ring 6 are insert-formed with a resin, which is made of a thermoplastic resin such as nylon. The pole board 1 has a recess 1a rotatably housed around a shaft 3a of a movable board 3, a shaft hole 1b in which the shaft 3b is fitted, and a connector portion 1d in which a terminal 2a of a fixed contact plate 2 is provided. Are integrally formed.

The recess 1a is a substantially fan-shaped space, and has a fixed contact 2b in contact with a plurality of movable contacts 4 on the bottom surface. The shaft hole 1b is a circular through hole formed in the bottom surface of the recess 1a, and the shaft 3b is axially aligned.

Reference numeral 1c denotes an annular groove formed in the periphery of the lower surface of the case 7 and into which an annular protrusion 7b for vibration welding is inserted.
The annular groove 1c is provided adjacent to the periphery of the recess 1a. 1
e is a vibration welding surface between the pole plate 1 and the case 7;
And the case 7 are in contact with each other.

The annular groove 1c forming the vibration welding surface 1e
May have a groove shape or a step-like shape in which the outer side surface of the annular projection 7b matches, and the shape is not particularly limited.

The fixed contact plate 2 is composed of a plurality of terminals. One terminal 2a at one end protrudes into the connector portion 1d, and the fixed contact 2 at the other end.
b is exposed on the bottom surface of the recess 1a. The movable platen 3 has a movable contact 4 and a contact spring 5 disposed on the lower surface, and shafts 3a and 3b protruding in the vertical direction at one end are integrally formed of resin. In the movable platen 3, the lower shaft 3 b is axially aligned with the shaft hole 1 b, and the upper shaft 3 a is inserted through the through hole 7 a of the case 7. The movable platen 3 is centered on the shaft hole 1b.
It rotates inside the recess 1a.

Each of the shafts 3a and 3b is a substantially cylindrical rotating shaft having a shaft hole 3h, and a shaft of an automatic transmission is axially mounted on the shaft hole 3h. The upper shaft 3a has a large-diameter portion 3c into which the O-ring 8 is fitted, and a ring-shaped stopper 10
A small-diameter portion 3d to which is fitted, the large-diameter portion 3c and the small-diameter portion 3d
And a concave portion 3f formed on the step surface 3e and engaged with a convex portion 10a formed on the lower surface of the stopper 10.

The diameter of the shaft 3b is larger than that of the shaft 3a. The shaft 3b has a groove 3g around which the O-ring 9 is fitted. The lower end of the shaft 3b is axially aligned with the shaft hole 1b. The lower surface of the stopper 10 facing the step surface 3e and the step surface 3e constitutes an ultrasonic welding surface of the stopper 10 and the shaft 3a.

The movable contact 4 is inserted into the lower surface of the movable plate 3 via a contact spring 5. When the ring 6 is screwed to the pole plate 1 and the automatic transmission, the ring 6 is insert-formed on the pole plate 1 in a state of being fitted to an edge of a screw insertion hole through which a screw is inserted. The ring 6 is made of a metal band-shaped member, and is disposed in a state of being attached to the inner wall of the oval screw insertion hole.

The case 7 is a lid member made of a resin such as nylon, in which an annular projection 7b corresponding to the annular groove 1c of the pole board 1 is formed near the periphery of the lower surface. The case 7 includes an annular protrusion 7.
b is loosely fitted in the annular groove 1c, and the surface in contact with the annular groove 1c is vibration-welded. Thereby, the entire circumference of the case 7 is fitted in the recess 1 a of the pole board 1 in a sealed state.

The stopper 10 is for closing the O-ring 8 fitted between the large diameter portion 3c of the shaft 3a and the through hole 7a to further improve the sealing performance. The stopper 10 is formed in a ring shape from a resin such as nylon.

The embodiment of the present invention is configured as described above, and its operation will be described in detail together with the assembling procedure. As a first procedure, the pole plate 1 is formed by insert-forming the fixed contact plate 2 pressed into a predetermined shape.

As a second procedure, first, the O-ring 9 is fitted into the groove 3g of the movable plate 3 formed of resin, and the O-ring 8 is fitted into the large diameter portion 3c. A movable contact 4 and a contact spring 5 are inserted into the movable platen 3. The movable platen 3 is inserted into the recess 1a, and the shaft 3b is aligned with the shaft hole 1b. The shaft 3a passes through the through hole 7a of the case 7. The case 7 matches the recess 1a, and fits the annular protrusion 7b into the annular groove 1c.

As a third procedure, the pole plate 1 is fixed to the lower jig of the vibration welding machine. Then, the case 7 fitted to the pole board 1 is fixed to the upper jig. The case 7 has two pole plates 1
The case 7 is pressurized by about 0 [kg] to 30 [kg] and the case 7 is slightly circularly vibrated in the horizontal direction by about 0.5 [mm] to 1.5 [mm], so-called orbital motion (Orbital Mo).
). The periphery of the joint surface between the case 7 and the pole plate 1 where the annular protrusion 7b contacts the annular groove 1c is frictional heat, and the joint surface melts in a few seconds. Then the vibration of the vibration welding machine stops,
The case 7 is automatically positioned on the pole plate 1, and the resin is solidified after the pressurized state of 1 to 2 [sec] is continued until both resins to be vibration-welded are solidified. Thereby, the pole plate 1 and the case 7 are welded by vibration.

As a fourth procedure, the stopper 10 is
Between the small diameter portion 3d and the through hole 7a, and
0a is loosely fitted into the recess 3f. The stopper 10 is fixed to the upper jig. The stopper 10 and the shaft 3a are ultrasonically welded by an ultrasonic welding machine. The protrusion 10a of the stopper 10
And the surface of the shaft 3a in contact with the periphery of the concave portion 3f is melted and welded. This completes the assembly.

Since the entire periphery of the case 7 is welded to the pole plate 1 by vibration, the periphery of the case 7 can be sealed. In the shaft 3a, an O-ring 8 is fitted between the large-diameter portion 3c and the through hole 7a, and the stopper 10 is fitted above the O-ring 8, and the stopper 10 is fitted to the step surface 3e. Since the ultrasonic welding is performed, the O-ring 8 does not fall off the shaft 3a, and the hermeticity of the shaft 3a can be further improved.

The inhibitor switch according to the present invention has a structure suitable for mass production because all the parts can be assembled from above and below, so that automatic assembly by a machine is easy. Also, since the pole plate 1 and the case 7 can be welded by vibration,
It is not necessary to interpose a packing between the pole board 1 and the case 7 to improve the sealing property, so that the number of assembly steps and the cost can be reduced.

[0025]

Since the present invention is constructed as described above, the following effects can be obtained. The invention according to claim 1 is
A pole plate having a fixed contact plate insert-formed therein, a movable plate having a movable contact in contact with the fixed contact plate, a shaft formed at the center of rotation, and a case having a through-hole axially aligned with the shaft; In the inhibitor switch, the shaft of the movable platen has a large-diameter portion to which an O-ring is fitted, a small-diameter portion to which a stopper is fitted, and a step surface between the small-diameter portion and the large-diameter portion. The stopper is fitted between the small-diameter portion and the through hole, and is ultrasonically welded to the step surface, so that the tightness of the shaft portion can be improved. In addition, the case can be vibrated in a small and small circle in the horizontal direction with respect to the pole plate, and the peripheral portion of the case and the pole plate can be welded by vibration.

According to a second aspect of the present invention, in the first aspect of the present invention, the stepped surface of the movable plate forms a concave portion, and the case forms an annular protrusion that fits loosely into the concave portion. Thus, the shaft portion can be easily ultrasonically welded.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the sealing of the pole plate and the case is improved by vibrating the peripheral portion of the case to the pole plate. be able to.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a view showing an embodiment of the present invention and is an enlarged sectional view of a main part.

[Explanation of symbols]

 Reference Signs List 1 pole board 2 fixed contact plate 3 movable board 3a, 3b shaft 3c large diameter section 3d small diameter section 3e step surface 3f recess 4 movable contact 7 case 7a through hole 7b annular protrusion 8 O-ring 10 stopper

Claims (3)

[Claims] An electrode plate (1) having a fixed contact plate (2) inserted therein, a movable contact (4) for contacting the fixed contact plate (2), and a shaft (3a) at the center of rotation.
And a case (7) in which a through hole (7a) is formed so as to be axially aligned with the shaft (3a), wherein the shaft of the movable plate (3) is provided. 3a) a large-diameter portion (3c) into which the O-ring (8) fits, and a stopper (10)
Form a small-diameter portion (3d) into which is fitted, and a step surface (3e) between the small-diameter portion (3d) and the large-diameter portion (3c). (3d) and the through-hole (7a), and ultrasonically welded to the step surface (3e). 2. The invention according to claim 1, wherein the step surface (3e) of the movable platen (3) forms a concave portion (3f), and the case (7) has a play in the concave portion (3f). A structure of an inhibitor switch, wherein an annular projection (7b) to be fitted is formed. 3. The structure of the inhibitor switch according to claim 1, wherein the case (7) has a peripheral portion vibration-welded to the pole board (1).