JPH0734407B2 - Variable resistor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary variable resistor capable of preventing intrusion from a bearing portion, and is mainly used outdoors where water may splash. It can be used for position, angle detection, automobiles, etc.

2. Description of the Related Art A rotary variable resistor having a waterproof mechanism on a shaft and a bearing is shown in FIGS.

As shown in FIGS. 4 and 5, a shaft 1 of a rotary variable resistor and a bearing 2 that supports the shaft 1 are provided, and a groove 2a is formed on the outer peripheral portion of the bearing 2 and the groove 2a is formed. The O-ring 3 is fitted in the part 2a.

The side on which the rotary variable resistor is mounted has a shaft 4 having a structure connected to the shaft 1 of the rotary variable resistor, and a structure having a hole 5 to be fitted with the bearing 2 of the rotary variable resistor. ing.

Then, the rotary variable resistor described above is fitted to this mounting side, whereby the O-ring 3 mounted on the variable resistor side is brought into contact with the wall surface of the hole 5, and not the variable resistor alone but the mounting thereof. It was designed to be waterproof including parts.

Problems to be Solved by the Invention In the conventional device described above, water or the like enters between the shaft 1 and the bearing 2 of the variable resistor, and the variable resistor alone does not have a waterproof function. For this purpose, the bearing 4 of the variable resistor is attached to the shaft 4 connecting the variable resistor.
It is necessary to form a hole 5 that fits in the O-ring protruding from the groove 2a and to insert the O-ring 3 into the groove 2a, and the structure is complicated and the cost tends to increase.

Means for Solving the Problems Therefore, according to the present invention, a rotary slide body provided in a case and the rotary slide body are rotated, and one end of the rotary slide body penetrates a bearing portion of the case and projects outside the case. A shaft body is provided, and a sheet in which at least the side surface of the case is coated with a vacuum grease compound and a disc spring for mechanically bringing the sheet into close contact with the bearing portion are arranged in the bearing portion of the case.

With the above-described structure, the seat is pressed by the disc spring, and since the seat is coated with the vacuum grease compound, the watertightness of the bearing is maintained.

Embodiment FIG. 1 and FIG. 2 show a sectional view of a rotary variable resistor with a waterproof function according to an embodiment of the present invention, and FIG. However, FIG. 1 is a sectional view after fitting. FIG. 3 is an exploded perspective view of the same.

In FIG. 3, reference numeral 8 is a slider fitted in the shaft body 13. Reference numeral 6 is a case fitted on the shaft body 13 and provided on the surface facing the slider 8 and having a bearing portion 6a in the center. Reference numeral 10 denotes a resin sheet which is fitted into the shaft body 13 and is provided on a surface facing the case 6, and a vacuum grease compound 9 is applied to the surface facing the case 6. Reference numeral 11 denotes a disc spring fitted on the shaft body 13 and provided on the upper surface of the resin sheet 10. A washer 12 is fitted in the shaft body 13 and is provided on a surface facing the disc spring 11.

In FIGS. 1 and 2, a resistor is provided in the case 6.
14 and a slider 8 having a sliding contact 7, the lower end of the shaft body 13 is pivotally supported by the bottom surface inside the case 6, and the upper end penetrates the bearing portion 6a of the case 6 and projects upward. ing. Here, the portion of the slider 8 that supports the sliding contact 7 is made of an insulating material such as resin, and the shaft 13 is made of metal. In this state, a resin sheet 10 fitted with the shaft body 13 and provided with a vacuum grease compound 9 provided on a surface facing the upper surface of the case 6 is arranged, and a surface facing the resin sheet 10 is arranged. Is provided with a disc spring 11 and a washer 12 for urging the seat 10 toward the bearing portion 6a, and the upper end of the shaft body 13 is mechanically engaged.

FIG. 1 shows a state where the washer 12 is fitted. Since the disc spring 11 is flexed and fixed by the force of the upper part when the female is made,
In order to always return to the original state shown in FIG. 2, the resin sheet 10 is pressed against the bearing portion side with a constant force. Therefore, the resin sheet 10 makes the vacuum grease compound 9 adhere to the bearing portion of the case 6, maintains an airtight state, and fulfills a waterproof function.

At this time, the upper end of the slider 8 must be dimensioned so as to contact the lower surface of the case 6, and
The flexure of the disc spring 11 must be such that it does not have such an extreme flexure that it loses its springiness. The outer circumference of the sheet 10 is thicker than the inner side.

EFFECTS OF THE INVENTION The present invention is configured as described above, and since the waterproof mechanism is installed directly on the shaft / bearing portion of the rotary variable resistor, the waterproof resistor is installed on the side where the variable resistor is installed. Since it is not necessary to perform processing for this purpose and the variable resistor can be waterproofed alone, it is not necessary to consider the waterproof structure of the mounting portion of the variable resistor.

In addition, since the vacuum grease compound is used in the bearing portion, foreign matter such as dust can be attached to the vacuum grease compound in addition to the infiltration of water, and the invasion of the foreign matter can also be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of a variable resistor according to an embodiment of the present invention,
FIG. 2 is a sectional view of a variable resistor according to an embodiment of the present invention before the shaft body is fitted, FIG. 3 is an exploded perspective view of the same, FIG. 4 is a perspective view of a conventional variable resistor, and FIG. FIG. 6 ... Case, 9 ... Vacuum grease compound, 10 ...
… Seat, 11 …… Disc spring, 13 …… Shaft.

Claims (1)

[Claims] 1. A shaft provided with a slider provided in a case and a shaft for rotating the slider and having one end penetrating a bearing portion of the case and protruding outside the case. A resin-made sheet which is fitted and is provided on the surface facing the case and coated with grease, a disc spring fitted on the shaft body on the surface facing the sheet, and a disc spring on the surface facing the disc spring. A variable resistor that mechanically adheres to the case through a washer fitted into the shaft.