JPS6084455A - Inhibiter switch for automatic transmission - Google Patents

Abstract

PURPOSE:To improve accuracy in a conductive range by arranging fixed contacts on two different radial positions spaced from the rotary center of a movable piece and fixed contacts for positions P, N on the radially outermost side positions spaced from the rotary center of the movable piece. CONSTITUTION:In a pole plate 12, fixed contacts 14a, 14b for position P, fixed contacts 16a, 16b for position R, fixed contacts 18a, 18b for position N, fixed contacts 20a, 20b for position D, fixed contacts 22a, 22b for position II and fixed contacts 24a, 24b for position I are distributed at predetermined angles on the circumference centering around the rotary center O on a shaft 26. The fixed contacts 14a, 14b, 18a, 18b for positions P, N are arranged on the radially outermost side positions spaced from the center O. Thus, accuracy in the conductive range of important positions P and N for safety can be improved compared with accuracy in the other positions, and a compact inhibitor switch can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to an inhibit switch for an automatic transmission.

(b) Prior art The inhibitor switch of the automatic transmission is a switch that is linked to the selector lever/toward of the driver's seat and turns on a predetermined contact point according to the select position 1ξ. In a movable switch, a movable contact is provided on a movable element, and a fixed contact is provided on a substantially fan-shaped fixed plate. Fixed contacts are provided, for example, at P, R, N, D, II, and (2) range positions. The P and N fixed contacts are used to conduct the engine starter circuit.

The R range fixed contact is also used as a reverse light switch. D, ■■, and ■range fixed contacts are also used for engine control, etc., respectively. The fixed contacts on the fixed plate side are arranged on the same radial position from the center of rotation of the mover (for example, those used in the A40D type automatic transmission manufactured by Toyota Motor Corporation, the 4N71B type automatic transmission R manufactured by Yasan Automobile, etc.) )9 However, with the conventional automatic transmission inhibit switch,
No consideration was given to further improving the conduction range accuracy at the P and N positions. That is, P and N' (
The accuracy of the conduction range at ,l,i,2 was assumed to be equivalent to the accuracy at other positions. However, P and! The conduction range accuracy at the q position is extremely important from a safety standpoint.

That is, if the select lever is not in the D or R position and the contacts at the P and N positions are electrically connected due to linkage side errors, etc., the vehicle will start running the moment the engine starts.

(c) Purpose of the invention The purpose of the present invention is to improve the accuracy of the conduction range of the contacts at the P and N positions, and to downsize the inhibitor switch while maintaining the necessary accuracy of the conduction range. .

(D) Structure of the Invention In the inhibitor switch for an automatic transmission according to the present invention, the fixed contacts are arranged at at least two different radial positions from the center of rotation of the mover, and the fixed contacts for the P and N positions are movable. They are arranged at the outermost position in the radial direction from the child rotation center.

(E) Embodiments Hereinafter, embodiments of the present invention will be described based on FIGS. 1 and 2 of the accompanying drawings.

1 and 2 show one embodiment of the invention. A pole plate 12 is fixed to the inside of the road casing 10 by screws (not shown).The pole plate 12 has fixed contacts 14a, 14b for P position, fixed contacts 16a, 16b for R position,
Fixed W contacts 18a, 18b for N position, fixed contact 2 for D position
0a, 20b.

Fixed points 22a, 22b for the 11th position, and fixed contacts 24a, 24b for the position 2 are provided. Each fixed contact is
They are distributed at predetermined angles in the circumferential direction around the rotation center O of the shaft 26, which will be described later. The shaft 26 is
It is rotatably supported with respect to the casing 10, and a movable element 28 is attached to a portion of the shaft 26 inside the casing 10 so as to rotate therewith. Mover 28
are provided with movable contacts 30 and 32. The distance N1 of the movable contact 30 from the center O of the shaft 26 is greater than the distance N1 of the movable contact 32 from the center O. P
Position fixed contacts 14a, 14b and N position fixed contact 1
8a and 18b are arranged at 1"ξ so that they can be electrically connected by the movable contact 30 when the gripper 28 rotates around the shirt I.26.Furthermore, the fixed contact 1 for the R position
6a, 16b, D position 16 fixed contacts 20a, 20b, I
The fixed contacts 22a, 22b for the I position and the fixed contacts 24a, 24b for the work position are arranged at the I1"l position where they can be electrically connected by the movable contact 32. At the fitting part between the shaft 26 and the casing 10, there is a An O-ring 34 is provided, and a seal ring 36 is also provided at the fitting portion between the electrode plate 12 and the casing lO.This prevents oil and dirt 1) from entering the inside of the casing 10. On the outer part of the casing 10 of the shaft 26, a nut 38 connects the shaft 26 with
It is arranged so that it rotates as one. Lever 4
0 is connected to the driver's seat select/flash via a linkage not shown.

When the Sereno I lever on the driver's seat is operated, the lever 40 rotates via a linkage (not shown). lever 40
The rotation of is transmitted to the mover 28 via the shaft 26,
The movable element 28 rotates. In the state shown in FIG. 2, the movable element 28 is at a position corresponding to the position (■) of the select lever.

Thereafter, when the select lever is moved to the Il, D, N, R, and P positions, the movable member 28 is sequentially moved clockwise in FIG.
Rotate to I, D, N, R, P positions. In the work, Il, D and R positions, the movable contacts 32 of the mover 28 are fixed contacts 24a-24b, 22a-22b, 20a, respectively.
-20'b, and 16a-16b are brought into conduction. In the N and P positions, the movable contact 30 of the movable element 28 is connected to the fixed contacts 18a, 18b for the N position and the fixed contact 14a for the P position.
, 14b are made conductive. Fixed contacts 18a, 18 for N position
When the fixed contacts 14a and 14b for the b or P position conduct,
The engine's sufu-ku circuit becomes conductive and the engine starts. That is, the further the position of the fixed contact is from the center O, the smaller the possibility that the fixed contact will become conductive when it should not be conductive due to an angular error of the movable element 28.

In the case of this automatic transmission inhibitor switch, fixed contacts 18a, 18b for N position and fixed contact 14a for P position
, 14b is located at the farthest position from the center 0,
The accuracy of the conduction range is the highest. Therefore, even though the select lever is in the D position or the R position, the N
Position fixed contact 18a, 18b or P position rigid fixed contact 1
4a and 14b are never electrically connected. Therefore, safety is further improved. In addition, this means that the fixed contacts 18a and 18b for the N position and the fixed contact 14a for the P position 11v1,
If 14b is placed at a position closest to the center 0 that is permissible in terms of accuracy, it will be appreciated that the inhibitor switch can be downsized while maintaining the accuracy of the necessary conduction range. In particular, the fixed contacts 24a and 24b for the ■ position are set to N.
Position fixed contacts 18a, 18b and P position rigid fixed contact 1
Since the fixed contacts 24a and 24b are located closer to the center 0 than the fixed contacts 4a and 14b, the fixed contacts 24a and 24b are arranged at the same radial position as the fixed contacts 18a and 18b for the N position. A part of the external shape can be made smaller. That is, the inhibitor switch can be downsized by the portion indicated by the imaginary line in FIG.

(f) As described in detail, the present invention includes a rotatable movable element having a movable contact, P, N, and The fixed contacts for the P and N positions are arranged at the outermost position in the radial direction from the center of rotation of the mover, so there are four contacts for the P and N positions, which are important for safety. The range accuracy can be improved compared to the accuracy of other positions, and only the P and N positions need to be placed on a circle with a large radius, and the other positions only need to be placed on a circle with a small radius, so the inhibitor switch can be downsized.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an inhibit switch for an automatic transmission according to the present invention, and FIG. 2 is a sectional view taken along line TI-1 in FIG. lO...Casing, 12・φ・Pole plate, 14a, 14
b...Fixed contact for P position, 16a, 16b--@RN
Fixed contacts for position 18a, 18b... Fixed contacts for N position, 20a, 20b... Fixed contacts for D position, 22a, 2
2bφ... Fixed fixing point for 11 positions, 24a, 24b...
Fixed contact for working position, 26...Shaft, No. 28...L
If mover, 30.32--movable contact, 40--fist lever. Patent applicant Nissan Motor Co., Ltd. Agent Patent attorney Toshiyuki Miyauchi

Claims (1)

[Claims] a rotatable mover having a movable contact; and P arranged at at least two different radial positions from the center of rotation of the mover.
, N, and other select positions, and the fixed contacts at the P and N positions are arranged at the outermost position in the radial direction from the rotation center of the mover. switch. ′