JPH02143168A - Positioning method for mercury switch of acceleration switch - Google Patents

Abstract

PURPOSE:To position two acceleration switches without any play and to enable high-accuracy measurement by inserting the acceleration switches by putting a rubber member between the upper and lower slanting surfaces of the recessed part of a housing. CONSTITUTION:The rubber member 20 is put in the recessed part 12 wherein there is the reverse-surface side positioning surface 14 of the triangular member 15 of the housing 11 to insert the acceleration switches 21 and 22 composed of two mercury switches, and a triangular member 19 with a top positioning surface 23 is inserted to fix the switches 21 and 22 in parallel without any play. Acceleration is measured by this double switch having no play with high accuracy.

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention is an acceleration switch used when detecting acceleration mounted on a car, etc., and in order to double detect the set acceleration, two pieces of mercury are used. The present invention relates to a method of positioning a switch within an acceleration switch.

<Prior Art> In recent automobiles, an acceleration switch for detecting acceleration is used as part of a brake system to ensure anti-lock performance during braking.

That is, the magnitude of deceleration during braking is detected by an acceleration switch, and the friction coefficient of the road surface is estimated to perform brake control. Such an acceleration switch is positioned by inserting mercury switches 4.5 into upper and lower grooves 2.3 provided in the side surface of a rectangular housing 1 made of a resin molded product, as shown in FIG.

<Problem to be solved by the invention> In the conventional positioning method as described above, the mercury switch 4
．． 5 and housing 1! There was a problem in that the accuracy of the detected acceleration deteriorated because a backlash was necessary between 42.30 and 42.30.

The present invention solves the above-mentioned problems and provides a method for positioning a mercury switch that allows easy positioning, no backlash, and accurate acceleration measurement.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides an acceleration switch using two mercury switches in order to independently and doubly detect the set acceleration. into the recess of the housing of the acceleration switch, and then
By inserting a rubber member between the two mercury switches, the two mercury switches are pressed against the upper and lower sloped surfaces of the recess, thereby making both mercury switches parallel. This is what we provide.

In addition, after fitting the upper and lower mercury switches with rubber members inserted into the recesses, a right triangular positioning plate is inserted into the upper part of the recess with its lower surface being an inclined surface, and the positioning plate A method is also provided in which the upper and lower mercury switches are crimped onto a rubber member using the lower surface of the mercury switch and the inclined positioning surface at the bottom of the recess.

<Example> Hereinafter, an example of the present invention will be described based on the accompanying drawings.

In FIGS. 1 and 2, 11 is a housing made of a resin molded product, and 12 is a recess formed on the side surface of the housing 11. The upper surface 13 of this recess 12 is horizontal, and the lower surface is an inclined positioning surface 14. The lower part of surface 14 is a right triangle! It is 5.

In the horizontal part thereof, vertical grooves 17 and 1 are separated by a partition plate 16 integrated with the housing IJ and communicate with the recess 12.
It is 8.

Reference numeral 19 denotes a positioning plate made of a resin product separate from the housing 11, and is a right triangle having the same thickness as the depth of the recess 12 and the same shape and dimensions as the right triangle part 15.

Further, reference numeral 20 denotes a rubber member, which is plate-shaped and has the same width as the thickness of the positioning plate 19. To assemble the mercury switches 21.22 into the housing 11, first insert the two mercury switches 21.22 into the recess 12, and insert the rubber member 20 between the two mercury switches 21.22.

Finally, the positioning plate 19 is fitted into the upper part of the recess 12. In this way, the mercury switch 21, 22, the rubber member 2
0, when the positioning plate 19 is installed, the positioning plate 19
The lower surface 23 of the positioning plate 19 is parallel to the positioning surface 14 as shown in FIG.
The thickness of the rubber member 20 is set so that the rubber member 20 is in close contact with and parallel to the rubber member 4, and there is no looseness.

<Effects of the Invention> As described above, the present invention can achieve the following by inserting two mercury switches into the recesses of the housing of the acceleration switch and further inserting a rubber member between the two mercury switches. These two mercury switches are pressed against the upper and lower sloped surfaces of the recess to make them parallel, and both mercury switches are brought into close contact with the positioning surface of the housing and the positioning plate due to the elasticity of the rubber member. Because it is a thing,
There is no backlash between the mercury switch and the recess in the housing, which is the case with conventional products.

Furthermore, when installing the positioning plate, the friction between the positioning plate and the mercury switch is smaller than the friction between the rubber member and the mercury switch, so the mercury switch can be set without rotating. This can prevent deviations in set values due to rotation of the mercury switch.

[Brief Description of the Drawings] Fig. 1 is a perspective view showing an embodiment of the method of this invention, Fig. 2 is a front view of an acceleration switch in which a mercury switch is positioned by the method of this invention, and Fig. 3 is a perspective view showing an embodiment of the method of the present invention. FIG. 3 is a front view of the switch. 11...Housing 12...
Recessed portion 14...positioning surface 19...positioning plate 20...rubber member 21. 22...Mercury switch 23...Bottom surface of positioning plate

Claims (2)

[Claims] (1) In an acceleration switch using a mercury switch, in order to detect the set acceleration independently and doubly, two mercury switches are inserted into the recess of the housing of the acceleration switch, and the two mercury switches are A method for positioning a mercury switch in an acceleration switch, characterized in that the two mercury switches are fixed in parallel by inserting a rubber member between the two mercury switches and pressing them against the upper and lower sloped surfaces of the recess. . (2) After fitting the upper and lower mercury switches with rubber members in the recess, insert a right triangular positioning plate into the upper part of the recess so that its lower surface becomes an inclined surface. 2. The method for positioning a mercury switch in an acceleration switch according to claim 1, wherein the upper and lower mercury switches are pressed against the rubber member by the lower surface and the inclined positioning surface at the bottom of the recess.