JPH0755784Y2 - Changeover switch - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to improvement of various changeover switches, and more particularly to a structure for maintaining a sealed state between a case and a base.

[Conventional technology]

Conventionally, in various switches, as a switch for switching the switch by driving a movable plate in a case formed of a case and a resin base, for example, a practical open switch 59-154
There are many technologies such as those disclosed in Japanese Patent No. 722.

Depending on the installed environment, these changeover switches may
The sealed state inside and outside the switch case becomes a problem.

For example, it is an inhibitor switch mounted on an automatic transmission for a vehicle and driven by operating a lever of the automatic transmission for setting a traveling state. In this inhibitor switch, the movable contact piece arranged on the movable plate switches a plurality of fixed contacts on the base according to the rotation angle of the operation lever connected to the control shaft of the automatic transmission, It is installed in the engine room of the vehicle. The inside of the engine room is the place most susceptible to the environment in which the vehicle is parked / stopped and the vehicle is running, and the switches installed therein are also strongly required to be heat resistant and waterproof.

[Problems to be solved by the invention]

In the above-mentioned conventional technique, since the resin substrate is thermally deformed at high temperature, the sealed state between the case and the substrate is deteriorated, the airtightness between the inside and outside of the case is deteriorated, and the waterproof function is impaired. There is

[Means for solving problems]

The present invention has been devised in view of the above-mentioned problems, and in a changeover switch for switching a switch with a fixed contact arranged on a base by driving a movable plate having a movable contact arranged in a case, To solve the above problems, a change-over switch is constructed by providing a gap outside the space in which the board is housed and at the position where the case and the base are in contact with each other to prevent thermal deformation. It is a thing.

[Action]

According to the above configuration, when the substrate is thermally deformed, the amount of deformation can be reduced, so that the sealed state between the case and the substrate can be maintained.

〔Example〕

A preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings, which is an example applied to an inhibitor switch.

Reference numeral 1 denotes a case made of a metal material, which is formed in a thin frame shape, and has a screw hole 1h formed on the periphery thereof to form a base 2 on the screen.
Are fixed with screws. Further, the case 1 is formed with a long hole 1a to be attached to an automatic transmission (not shown).

Reference numeral 2 is a base made of a resin material. As shown in FIG. 4, a support hole 2a is formed in the upper surface, and a plurality of fixed contacts 3 are arranged concentrically around the support hole 2a. . Further, the board 2 is integrally formed with a connector 2b for connecting to an external wiring. Reference numeral 4 is a terminal which is electrically connected to each fixed contact 3 and arranged in the connector 2b.

Reference numeral 5 is a rotary shaft made of a metal material, and has an inner end portion 5a pivotally supported by the support hole 2a, a central portion 5b pivotally supported by the pivot support hole 1b of the case 1, and the outside of the case 1. The outer end portion 5c is exposed.

Reference numeral 6 denotes an operating lever as an operating element made of a resin material, and one end of the operating lever 6 is integrally molded to cover and fix the outer end portion 5c exposed to the outside of the case 1. The other end of the operating lever 6 is formed with a connecting hole 6a for connecting a drive arm (not shown) driven by the control shaft of the automatic transmission.

On the outer wall surface 1c of the case 1, an annular groove 1d is formed around the exposed rotation shaft 5, that is, around the shaft support hole 1b, and is filled with grease 7. Further, on the surface of the operation lever 6 facing the case 1, a protruding ring 6b protruding into the annular groove 1d is formed. Thus, the outer end 5c of the rotating shaft 5 and the case 1
The shaft support hole 1b is sealed from the outside by the protrusion ring 6b of the operation lever 6 protruding into the grease 7 filled in the annular groove 1d. Reference numeral 8 is an "O" ring that seals between the central portion 5b of the rotary shaft 5 and the shaft support hole 1b of the case 1.

Reference numeral 9 denotes a movable plate made of a resin material, and a mounting plate 10 made of a metal material is integrally fixed to one end of the movable plate. Mounting plate
The through hole 10a opened at the top and bottom is inserted from the inner end 5a, and the screw 10 is fixed to the rotary shaft 5 by tightening a screw portion 5d formed on the rotary shaft 5 and a nut 11. The movable platen 9 is provided with a movable contact 13 facing the fixed contact 3 and biased by a compression spring 12.

By the way, in general, when the temperature of the surroundings changes, the base 2 made of a resin material is deformed to the opposite side of the case 1, that is, to the outside due to the effect of thermal expansion of the air in the case 1 when the temperature rises. Occurs. In that case, the base 2 is deformed from the outer peripheral end of the case 1 as a base point, but the periphery is fixed at the screw hole 1h position formed in the case 1 to prevent the deformation, so that “O”
The sealing state of the ring 14 is maintained.

However, when the base 2 and the connector 2b are integrally formed,
Due to the arrangement of the terminals 4, the connector 2b cannot be screwed in the arrangement direction. Therefore, the deformation of the substrate 2 at that portion cannot be prevented, resulting in poor sealing of the "O" ring 14.

As a countermeasure against this, in the case 1, a step portion 1e is formed on the surface facing the base 2 as shown in FIGS. The step portion 1e is provided to escape the contact of the base surface when the base 2 is thermally deformed, and is approximately 0.8 [in the arranging direction of the connector 2b, that is, the range shown by the diagonal lines in FIG. By forming a step of about [mm], a gap X is formed between the base 2 and the surface. Further, there is no gap Y between the contact surface 1f on the side wall of the case 1 and the contact surface 2c at the rising portion of the connector 2b, or a small amount as compared with the gap X of the stepped portion 1e,
For example, it is set to about 0.1 to 0.2 [mm]. Reference numeral 14 is an "O" ring that seals between the case 1 and the base 2, and is fitted in a groove 1g formed around the case 1 as shown in FIG.

Thus, when the surrounding temperature becomes high, thermal deformation of the connector 2b disposed position on the substrate 2 is prevented by the contact between the contact surfaces 1f and 2c first.
Therefore, the sealed state of the "O" ring 14 is maintained even in this portion.

In the above embodiment, the changeover switch is not limited to the inhibitor switch, but may be a rotary switch, for example.

Further, the step portion 1e for providing the gap X between the case 1 and the base 2 can be formed in either one or both of the case 1 and the base 2.

Furthermore, the case 1 is more than the gap X between the case 1 and the base 2.
When the gap Y on the contact surface 1f side is set to be large, the base 2 will be thermally deformed from the rising point S of the stepped portion 1e shown in FIG. Since the deformation amount of is small, the sealed state can be maintained.

[Effect of device]

As described above in detail, according to the present invention, since a gap that prevents thermal deformation is provided at a position outside the space in which the movable plate is stored and where the case and the base are in contact with each other, the base is provided. Even if thermal deformation occurs, the amount of deformation can be reduced by the gap, and the sealed state between the case and the base can be maintained. Therefore, for example, when the structure according to the present invention is applied to switches, such as an inhibitor switch, in which heat resistance and waterproofness are strongly required to be arranged in the engine room, the waterproof function of the switch is caused by thermal deformation of the base. There is no hindrance. In addition, for example, when the base and connector are integrally molded, the amount of deformation of the base at that part can be reduced even if it is not possible to screw the connector in the mounting direction due to the arrangement of the terminals. It is possible to prevent defects such as poor sealing of the ring.

[Brief description of drawings]

1 to 4 show a changeover switch 1 according to the present invention.
Fig. 1 shows an embodiment, Fig. 1 is a vertical sectional view in an assembled state,
2 is a plan view of the configuration shown in FIG. 1, FIG. 3 is a rear view of the case shown in FIG. 1, and FIG. 4 is an exploded perspective view of essential parts of the components shown in FIG. 1 ... Case, 1b ... Shaft support hole, 1c ... Outer wall surface, 1d ... Annular groove, 1e ... Step part, 1f ... Contact surface, 2 ... Base, 2b ...
… Connector, 2c… Contact surface, 3… Fixed contact, 5… Rotating shaft, 5c… Outer end, 5d… Screw part, 6… Operating lever, 6b… Projection ring, 7… Grease, 9 ... Movable plate, 11
...... Nut, 13 ...... movable contact, 14 …… “O” ring.

Claims (1)

[Scope of utility model registration request] 1. A switching method in which a movable plate (9) provided with a movable contact (13) in a case (1) is driven to switch a fixed contact (3) provided on a substrate (2). In the switch, a gap (X, Y) that prevents thermal deformation is provided at a position outside the space accommodating the movable plate (9) and at a position where the case (1) and the base (2) are in contact with each other. A changeover switch characterized by that.