JPH08277913A - Shift switch for automatic transmission for automobile - Google Patents

Abstract

PURPOSE: To avoid a non-signal condition with certainty by inclining end shapes of a plurality of fixed contact parts corresponding to shift positions in a shift switch, and overlapping two fixed contact parts with each other a little by means of the movable contact part. CONSTITUTION: A shift switch 14 senses a shift operation position for automatic transmission which is remote-controlled by means of a shift lever. The shift switch 14 has a movable contact part 60 which is rotated around a center RC according to the shift position selection operation of the shift lever and a plurality of fixed contact parts 62 corresponding to the shift positions. Among the fixed contact parts 62, a neutral shift fixed contact part 62-N, a running shift fixed contact part 62-D, and second shift fixed contact part 62-2 have end shape inclined to a center line C of the movable contact part by a specified angle θ. Two fixed contact parts are a little overlapped with each other by means of the movable contact part 60 for avoiding temporary non-signal condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift switch for an automatic transmission for an automobile, and more particularly to a movable contact portion, in which the end shape of the fixed contact portion is movable in order to slightly overlap between the two fixed contact portions. Inclining to have a predetermined angle with respect to the center line passing through the center of rotation of the contact portion and the tip portion,
The present invention relates to a shift switch for an automatic transmission for a vehicle that avoids a signalless state.

[0002]

2. Description of the Related Art A vehicle is provided with an automatic transmission or a manual transmission in order to convert the driving force of an engine mounted on the vehicle into a desired one in accordance with running conditions.

In some automatic transmissions (automatic transmissions, ATs), a shift map consisting of engine speed and throttle opening is set, and shift control is performed using this shift map.

In the automatic transmission, when the ignition key is turned on, the shift lever cannot be changed from the parking shift position to another shift position without depressing the brake pedal, that is, the parking of the position plate (detent plate). A shift lock device having a lever lock mechanism that keeps a position pin (detent pin) engaged with the step portion and a key interlock mechanism that cannot remove the ignition key unless the shift lever is in the parking shift position. Alternatively, some have a brake interlock device.

As a shift switch for the automatic transmission for an automobile, there is one disclosed in Japanese Patent Publication No. 53195/1978. The multi-stage switching device for an automatic transmission for an automobile disclosed in this publication is configured as a selector switch for temporarily switching the selector switch when the movable contact is moved from one of the fixed contacts to the other after being lap-connected. Thus, when the "2" state is selected to the "D" state, the engine speed of the second speed is maintained as it is without becoming the third speed to avoid the no signal state.

[0006]

By the way, in the shift switch of the conventional automatic transmission for automobiles, the shift switch 114 has a movable contact portion 160 provided on a rotating plate 164 and a rotating contact, as shown in FIG. Fixed contact portion 16 disposed on main body 166 at an equidistant position with respect to a rotation center RC of a rotation shaft 168 that rotatably supports plate 164.
2 and an arc-shaped fixed contact portion 170 for short circuit disposed in the main body 166 inside the movable contact portion 160.

The fixed contact portion 162 has a fixed contact portion 162-P for parking shift which matches a parking shift position (P) which is each shift position of a shift lever (not shown), and a reverse position which matches a reverse shift position (R). Fixed contact for shift 16
2-R, the neutral shift fixed contact portion 162-N that matches the neutral shift position (N), the traveling shift fixed contact portion 162-D that matches the traveling shift position (D), and the second speed shift position ( Fixed contact portion 162 for 2nd speed shift that conforms to 2)
-2 and a fixed contact portion 162-L for 1st speed shift that matches the 1st speed shift position (L).

However, as is apparent from FIG. 12, since the gap S between the fixed contact portions 162 is formed larger than the width dimension of the movable contact portion 160, the fixed contact portion 16 is formed.
At the gap S portion between the two, the movable contact portion 160 is temporarily separated from the fixed contact portion 162, and a signalless state occurs.

As a result, there is a disadvantage in that there is no signal during the switching operation by the shift lever, which causes an abnormality in the automatic shift control, which is disadvantageous in practical use.

As a first measure for avoiding this no-signal state, there is one disclosed in Japanese Patent Publication No. 53195/1978.

However, in the one disclosed in Japanese Patent Publication No. 53195/1978, the sliding area of the movable contact is large, the sliding resistance is large, and metal powder is generated due to sliding wear to deteriorate the insulating property. There is an inconvenience to do.

As a first measure for avoiding the no-signal state, there is one disclosed in FIG.

In the structure disclosed in FIG. 13, the fixed contact portion 262 of the shift switch 214 is set to the parking shift position (P).
Fixed contact portion 262-P for parking shift that matches the above, and fixed contact portion 2 for reverse shift that matches the backward shift position (R).
62-R, a neutral shift fixed contact portion 262-N that matches the neutral shift position (N), a traveling shift fixed contact portion 262-D that matches the traveling shift position (D), and a second speed shift position ( Fixed contact portion 26 for 2nd speed shift that conforms to 2)
2-2 and the fixed contact portion 262-L for the 1st speed shift that matches the 1st speed shift position (L).

Then, for example, the neutral shift fixed contact portion 2
62-N, the traveling shift fixed contact portion 262-D and the second speed shift fixed contact portion 262-2 are overlapped with each other so that the traveling shift fixed contact portion 262-D is fixed.
It is arranged at a portion between 62 and the arc-shaped fixed contact portion 270 for short circuit to avoid a no signal state.

However, the traveling shift fixed contact portion 2 is provided between the fixed contact portion 262 and the arc-shaped fixed contact portion 270 for short circuit.
Since it is necessary to provide 62-D, the fixed contact portions 262 are arranged in two stages on the main body 266, and the shift switch becomes large, which is disadvantageous in practical use.

[0016]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention has a vehicle having a control means for performing shift control by a shift position signal from a shift switch according to a shift position selecting operation of a shift lever. In the automatic transmission for vehicle, the shift switch is formed by a movable contact portion that rotates about a rotation center in response to a shift position selecting operation of the shift lever and a plurality of fixed contact portions that match each shift position. An end shape of the fixed contact portion is provided so as to be inclined to form a predetermined angle with respect to a center line passing through the rotation center of the movable contact portion and the tip end portion,
It is characterized in that the movable contact portion is configured to slightly overlap between the two fixed contact portions.

[0017]

According to the invention as described above, in the shift position selecting operation of the shift lever, the movable contact portion of the shift switch is rotated according to the shift position selecting operation of the shift lever, and a predetermined angle with respect to the center line. The movable contact portion slides between the two fixed contact portions having the end shapes inclined to have a slight overlap while avoiding a signalless state.

[0018]

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 10 show an embodiment of the present invention. 2 and 3, reference numeral 2 is an automatic transmission for an automobile (not shown), and 4 is a shift lever.

The lower end of the shift lever 4 is pivotally supported by a bracket 8 below the guide plate 6 so as to be swingable. The upper end side of the shift lever 4 has a guide hole 10 in the guide plate 6.
And is projected upward. As shown in FIG. 2, the guide plate 6 includes a parking shift position (P) which is each shift position of the shift lever 4, a reverse shift position (R), a neutral shift position (N), and a traveling shift position (D). ), The second speed shift position (2), and the first speed shift position (L) are sequentially displayed.

The shift lever 4 is a shift cable 1
2 to the automatic transmission 2.

At this time, the shift cable 12
Is communicated to the automatic transmission 2 via the shift switch 14. The shift switch 14 detects a shift operation position of the automatic transmission 2 that is shifted by a shift operation of the shift lever 10.

Further, the lever lock solenoid 16 of the shift lever 4 can be switched between off, on, and start states by operating an ignition key 18 of a vehicle (not shown) in which the automatic transmission 2 is mounted. The ignition switch 20 and a brake pedal switch 24 that detects the operating state of the brake pedal 22 of the vehicle are connected to each other.

The automatic transmission 2 includes a brake pedal switch 24 and a reverse shift position (R) of the shift lever 4.
Is connected to the R range alarming means 26 which issues an alarm when is selected.

Further, the control means 28 called an AT controller or ECU of the automatic transmission 2 is for carrying out shift control by a shift position signal from the shift switch 14, and according to the control system diagram of FIG. The configuration will be described.

An engine 32 is connected to the driving force input side of the automatic transmission 2 through a torque converter 30 and a final gear 34 is connected to the driving force output side of the automatic transmission 2.

Further, a throttle sensor 36 for detecting the throttle opening degree of a throttle valve (not shown) is connected to the engine 32, and a vacuum diaphragm 38 which operates by the intake pipe pressure is connected.

An oil pump 40 and a vacuum diaphragm 38, which communicate with the torque converter 30, are provided by connecting them to a hydraulic control device 42, and the hydraulic control device 42 is provided with a servo mechanism 44 or directly. It is connected to the automatic transmission 2.

Further, the hydraulic control device 42 is used for the automatic transmission 2
First solenoid 4 which is two solenoids A provided in the
6, and is connected to the control means 28 via a second solenoid 48 which is a solenoid B.

The control means 28 includes an oil temperature sensor 50 and a vehicle speed sensor 52 arranged in the final gear 34.
The shift switch 14, the air conditioner switch 54, etc. are connected.

A system circuit diagram centering on the control means 28 is shown in FIG. That is, the control unit 28 is connected with a sensor group including the shift switch 14, the throttle sensor 36, and the oil temperature sensor 50, and is also connected with various components such as the injector 56 and the fuel pump 58.

Then, the shift switch 14 is rotated around a rotation center RC in response to a shift position selecting operation of the shift lever 4, and a plurality of fixed contact portions matching each shift position. 62 and
The end shape of the fixed contact portion 62 is provided so as to be inclined to form a predetermined angle θ with respect to the center line C passing through the rotation center RC of the movable contact portion 60 and the tip end portion, and the movable contact portion 60 is provided. Therefore, the two fixed contact portions 62 are configured to slightly overlap each other.

More specifically, the movable contact portion 60 is provided on the rotating plate 64, and one end of the rotating plate 64 is attached to the main body 66 so as to be rotatable about the rotation center RC of the rotating shaft 68. To do. At this time, the movable contact portion 60 simultaneously switches the hydraulic circuit (not shown) of the mechanically connected automatic transmission 2.

Further, the fixed contact portion 62 corresponds to the parking shift fixed contact portion 62-P which matches the parking shift position (P) which is each shift position of the shift lever 4, and the reverse shift position (R). Fixed contact for reverse shift 62-R
A neutral shift fixed contact portion 62-N that matches the neutral shift position (N), a traveling shift fixed contact portion 62-D that matches the traveling shift position (D), and a second speed shift position (2). A fixed second-speed shift fixed contact portion 62-2 that matches,
It is composed of a fixed contact portion 62-L for 1st speed shift that matches the 1st speed shift position (L), is equidistant to the center of rotation RC of the movable contact portion 60, and is in an arc shape on the main body 66. It is arranged.

Then, the fixed contact portion 62, for example, the neutral shift fixed contact portion 62-N, the traveling shift fixed contact portion 62-D, the second speed fixed contact portion 62-2 is linearly slanted. Form. That is, as shown in FIGS. 1 and 6, with respect to the center of rotation RC of the movable contact portion 60, that is, the centerline C passing through the center of rotation RC of the rotating shaft 68 and the tip portion of the rotating plate 64. For example, the movable contact portion 60 is slightly allowed to pass between the two fixed contact portions 62 when the rotating plate 64 is rotated so that the end portion of the fixed contact portion 62 is inclined so as to have only one predetermined angle θ. It is configured to slide while wrapping.

At this time, an arc-shaped fixed contact portion 70 for short-circuiting is arranged in the main body 66 inside the movable contact portion 60.

The actual shifting of the automatic transmission 2 is performed by the two first and second solenoids 4 according to the shift position signal.
ON / OFF control of Nos. 6 and 48, and a hydraulic circuit that is switched according to the shift position selecting operation of the shift lever 4.

The shift switch 14 is electrically connected as shown in FIG. 7, and the shift lever 4 has a parking shift position (P), a reverse shift position (R), and a neutral shift position. The control means 28 inputs six signals of (N), a traveling shift position (D), a second speed shift position (2) and a first speed shift position (L).

Two first and second shift solenoids
The shift points at the solenoids 46 and 48 and the shift positions of the shift lever 4 are shown in FIG. 8, and the shift operation at each shift position of the shift lever 4 is disclosed in FIG.

Further, FIG. 10 shows a fail safe when the shift switch 14 is abnormal. That is, all the shift switches 14 are turned off when the connection circuit is broken, and two or more shift switches 14 are turned on when an overlap is input.

Next, the operation will be described.

In the shift position selecting operation of the shift lever 4, the movable contact portion 60 is rotated together with the rotating plate 64 of the shift switch 14 in accordance with the shift position selecting operation of the shift lever 4, and the movable contact portion 60 is rotated with respect to the center line C. As a result, the movable contact portion 60 slides between the two fixed contact portions 62 each having an end shape inclined to have the predetermined angle θ while slightly overlapping.

When the connection circuit is broken, the shift switches 14 are all turned off, and as shown in FIG. 10, it is determined that the shift switches 14 are in an abnormal state, and the fail safe function is set to the L range.

The shift position selecting operation of the shift lever 4 can be switched with moderation.
The movable contact portion 60 of the shift switch 14 may stop at a halfway position due to the convenience of the driver or the extension or wear of the connecting portion of the cable 12 or the like.
When a signal generated when 0 is stopped at a halfway position is input, that is, when an overlap is input, shift control to a shift position is performed according to a predetermined priority as shown in FIG.

As a result, an overlapping contact can be easily realized by simply changing the end shape of the fixed contact portion 62 within the range of the conventional size and shape. Can be reliably avoided, which is practically advantageous.

Further, since the end shape of the fixed contact portion 62 is provided so as to be inclined at a predetermined angle θ with respect to the center line C, the contact point of the fixed contact portion 62 is increased as compared with the conventional one. The distance between them can be increased, and the insulating property can be improved.

Further, since the fixed contact portion 62 has a simple end shape, it is easy to manufacture, and the cost can be kept low, which is economically advantageous.

Furthermore, the end portion of the fixed contact portion 62 is
By forming it into a straight line oblique shape having a predetermined angle θ with respect to the center line C, the end shape is simple, the manufacturing is easy, the cost can be kept low, and it is economically advantageous. The distance between the contacts of the fixed contact portion 62 can be increased, and the insulating property can be improved.

The present invention is not limited to the above-mentioned embodiments, but various application modifications are possible.

For example, in the embodiment of the present invention, the end portion of the fixed contact portion 62 is formed into a straight line slanted shape having a predetermined angle θ with respect to the center line C, and two fixed contact portions 6 are provided.
Although the movable contact portion 60 is configured to slide between the two while slightly overlapping, the fixed contact portion 72, for example, the neutral shift fixed contact portion 72-N and the traveling shift fixed contact portion as shown in FIG. The end shape of 72-D is formed in a wavy shape, and all parts of this wavy shape are provided so as to incline so as to have a plurality of predetermined angles with respect to the center line C, and when a rotating plate (not shown) is rotated,
A movable contact part (not shown) may slide between the two fixed contact parts 72-N and 72-D while slightly overlapping.

Then, by making the end shape of the fixed contact portion corrugated, the fixed contact portion and the movable contact portion have two or more overlapping portions, and the overlap signal can be surely input. It is possible, the reliability is improved, and it is practically advantageous.

[0052]

As described in detail above, according to the present invention, there is provided an automatic transmission for an automobile having control means for performing shift control by a shift position signal from a shift switch according to a shift position selecting operation of a shift lever, The shift switch is formed by a movable contact portion that rotates about a rotation center according to a shift position selecting operation of a shift lever and a plurality of fixed contact portions that match each shift position, and an end portion of the fixed contact portion. The shape is provided so as to be inclined at a predetermined angle with respect to the center line passing through the center of rotation of the movable contact portion and the tip portion, and the movable contact portion allows a small amount of overlap between the two fixed contact portions. Since it is configured, it is possible to easily realize the overlapping contact within the range of the conventional size and shape by simply changing the end shape of the fixed contact portion, and it is possible to temporarily generate the overlap contact. The no-signal state in which it obtained reliably avoided, which is advantageous in practical use. Further, by providing the end shape of the fixed contact portion so as to be inclined with respect to the center line so as to have a predetermined angle, the contact distance of the fixed contact portion can be increased as compared with the conventional one. It is possible to improve the insulation. Further, since the structure of the end shape of the fixed contact portion is simple, the manufacturing is easy and the cost can be kept low, which is economically advantageous. Furthermore, if the end of the fixed contact portion is formed into a straight line slanted shape having a predetermined angle with respect to the center line, the end shape is simple and easy to manufacture.
It is possible to keep the cost low, it is economically advantageous, the distance between the fixed contact portions can be increased, and the insulating property can be improved.

[Brief description of drawings]

FIG. 1 is a schematic enlarged view of a movable contact portion and a fixed contact portion of a shift switch showing an embodiment of the present invention.

FIG. 2 is an assembled perspective view of a switch operating system of a shift switch of an automatic transmission for an automobile.

FIG. 3 is a configuration perspective view of a switch operating system of a shift switch of an automatic transmission for a vehicle.

FIG. 4 is a control system diagram of an automatic transmission for a vehicle.

FIG. 5 is a system circuit diagram centering on a control means of an automatic transmission for an automobile.

FIG. 6 is an enlarged view of a shift switch of an automatic transmission for a vehicle.

FIG. 7 is a diagram showing electrical connection of shift switches.

FIG. 8 is a diagram showing a shift solenoid output and a shift point at each shift position.

FIG. 9 is a diagram showing a shift operation at each shift position.

FIG. 10 is a diagram showing fail-safe when a shift switch input is abnormal.

FIG. 11 is a schematic enlarged view of a movable contact portion and a fixed contact portion of a shift switch showing another embodiment of the present invention.

FIG. 12 is an enlarged view of a shift switch of an automatic transmission for a vehicle showing a first conventional technique of the present invention.

FIG. 13 is an enlarged view of a shift switch of an automatic transmission for a vehicle showing a second prior art of the present invention.

[Explanation of symbols]

 2 automatic transmission 4 shift lever 12 shift cable 14 shift switch 28 control means 46 first solenoid 48 second solenoid 60 movable contact portion 62 fixed contact portion 62-P parking shift fixed contact portion 62-P 62-R for backward shift Fixed contact 62-R 62-N For neutral shift Fixed contact 62-N 62-D For travel shift Fixed contact 62-D 62-2 For 2nd speed fixed contact 62-2 62-L For 1st shift Fixed contact portion 62-L 64 Rotating plate 66 Main body 68 Rotating shaft 70 Arc-shaped fixed contact portion

Claims (1)

[Claims] 1. An automatic transmission for an automobile having control means for performing shift control by a shift position signal from a shift switch in accordance with a shift position selecting operation of a shift lever, wherein the shift switch selects a shift position selecting operation of the shift lever. Is formed by a movable contact portion that rotates around a rotation center according to the above, and a plurality of fixed contact portions that match each shift position, and the end shape of the fixed contact portion is the rotation center of the movable contact portion. For an automobile characterized in that it is provided so as to be inclined at a predetermined angle with respect to a center line passing through the front end portion and the movable contact portion, and the two fixed contact portions are slightly overlapped by the movable contact portion. Shift switch for automatic transmission.