JP2605711Y2 - Position detection switch device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an improvement in a position detecting switch device.

[0002]

2. Description of the Related Art For example, as a device for detecting a shift position of a transmission, conventionally, as shown in FIG. 3 and FIG. On the other hand, an operating rod 3 which can be advanced and retracted in an axial direction orthogonal to a surface area including the step 2 and a steel ball 4 at the tip of the rod 3 in the axial direction by urging the operating rod 3 in the axial direction. A spring 5 to be brought into contact, a contact 6 in combination with a pair of spring plates 6a and 6b opposed to the rear end surface of the operating rod 3 and these front ends contact each other as an openable and closable portion; There is known a device provided with an insulator 7 protruding in a wedge shape toward a sandwiching portion 6.

In this case, when the steel ball 4 follows the step 2 on the shift fork 1 to move the operating rod 3 up and down, the wedge-shaped insulator 7 moves along with the forward position where the wedge-shaped insulator 7 cuts into the holding portion of the contact 6. It is displaced between the retracted position that escapes from the pinch portion. In other words, the energization between the contacts 6a and 6b is mechanically turned on and off in response to the advance and retreat of the insulator 7, so that the stroke position of the shift fork 1 (the shift position of the transmission) can be accurately detected. Reference numeral 8 denotes a switch case, and 9 denotes a transmission cover.

In Japanese Utility Model Publication No. 1-32123, a part of the outer periphery of the shift shaft is formed of an insulator, and a steel ball (contact) is provided in contact with a surface region including the insulator by a spring. A device that electrically detects the stroke position of the shift shaft from the positional relationship between the steel ball and the insulator by applying a high potential through a resistor has been proposed, but the contact is mechanically turned on and off by a step. In comparison with the case where the shift shaft is connected to the ground side, in addition to the complexity of the electric circuit such as connecting the shift shaft to the ground side, there are not many application examples because the processing cost of assembling the insulator to the shift shaft increases. .

[0005]

[Problems to be Solved by the Invention] By the way, such a conventional example (contact type is mechanically turned on and off by a step)
Although this is advantageous in terms of cost, it may cause a failure that does not turn on if foreign matter is caught between the contacts or wear of the contacts and insulator, or a failure that does not turn off if the contacts burn out. There was room for improvement in terms of performance and durability.

[0006] In order to solve such a problem, an object of the present invention is to secure high reliability and durability by using a proximity switch instead of a contact-type contact.

[0007]

[ MEANS FOR SOLVING THE PROBLEMS]
Position for detecting the shift position of the vehicle
In the detection switch device, the outer peripheral surface of the shift fork
A step is formed in the direction of the shift operation, while the step
Axis approximately perpendicular to the shift operation direction with respect to the surface area including
Provide an operating rod that can move back and forth in the direction
Cylindrical shape that freely slides through ton-shaped rear end
Switch case on the transmission cover side
And push the operating rod in its axial direction to
A spring that makes the rod end contact the outer peripheral surface of the
Forming a rear end face perpendicular to the axial direction on the operating rod
Sensing plate and the detection distance facing this plate
And a proximity switch that can be adjusted with a screw .

[0008]

[Function] The shift operation is performed with the shift operation of the transmission.
When the tok moves, the operating rod follows the step
A sensor that is displaced in the axial direction and forms the rear end face of the operating rod
The moving plate moves back and forth with respect to the proximity switch. Proximity
The switch moves the sensing plate within its detection distance.
Turns on when the sensor is
And Sensing plate is a cylindrical switch
Slide freely through the rear end of the piston rod into the case
Supported, forming a rear end face perpendicular to the axial direction of the operating rod
The proximity switch that is axially opposed to this.
Of the transmission through the linear displacement of the operating rod
The shift position can be accurately detected. Ma
Also, even if the step size of the shift fork changes, the proximity switch
The sensor has a sensing distance with the sensing plate
It can be easily adjusted. In other words, different models
It can also be applied to transmissions .

[0009]

In FIG. 1, reference numeral 10 denotes a transmission cover, and reference numeral 11 denotes a shift fork disposed therein. A step 12 is formed on a part of the outer periphery of the shift fork 11 at a predetermined position facing the moving direction. The transmission cover 10 is provided with a mounting hole 13 (stepped hole) that opens to the outside at the position where the step 12 is detected, and the hole 13 is capable of moving forward and backward in the axial direction with respect to a surface area including the step 12 of the shift fork 11. An actuating rod 14 and a steel ball 15 which at its tip also rolls freely over the surface area are provided.

The rear end of the operating rod 14 is formed in the shape of a piston.
Fixed to the outer surface of the The operating rod 1 is inside the case 16.
A spring 17 for urging the steel fork 4 and the steel ball 15 toward the shift fork 11 is accommodated therein, and a sensing plate 18 is integrally connected to a rear end face of the operating rod 14 in parallel with the same via a leg.

The case 16 has a tip (detection unit) inside.
The proximity switch 19 is arranged so that the side faces coaxially with the sensing plate 18. The proximity switch 19 has a cylindrical screw shape and is mounted by screwing into a screw hole on the case 16 side, and the detection distance with the sensing plate 18 can be adjusted by moving the proximity switch 19 in the axial direction with a screw. . Reference numeral 20 denotes a lock nut of the proximity switch 19.

With such a configuration, when the shift fork 11 as a position detection target moves in a predetermined operation direction, the steel ball 15 and the operation rod 14 follow the step 12 via the spring 17 and are displaced in the axial direction. Since the sensing plate 18 advances and retreats integrally with the operating rod 14, the proximity switch 19 is turned on in the state of FIG. 2 in which the sensing plate 18 approaches the detection distance, and is separated from the detection distance in FIG. Turn off in the state. In other words, the stroke position of the shift fork 11 (transmission shift position) can be accurately detected by turning the proximity switch 19 on and off.

In this case, the step 12 of the shift fork 11
The displacement of the operating rod 14 according to the sensing plate 1
Since detection is performed by the proximity switch 19 via the switch 8, the occurrence of a failure due to a contact failure of the switch itself is extremely small, and therefore, the reliability and durability of the device can be sufficiently improved. Further, even if a slight dimensional error occurs in the step 12 of the shift fork 11 or the like, the sensing plate 18
Can be easily adjusted by moving the proximity switch 19 forward and backward with a screw.

[0014]

Effects of the invention] In short, according to this invention, Trang
Positive for detecting the shift position of the transmission
The switch fork
While forming a step on the peripheral surface in the direction of the shift operation,
Is approximately orthogonal to the shift direction with respect to the surface area including the step
An operating rod that can move back and forth in the axial direction
That slides freely through the rear end of the piston.
Switch case on the transmission cover side
And push the operating rod in its axial direction.
A spring that brings the rod tip into contact with the outer surface of the fork
And a rear end surface perpendicular to the axial direction on the operating rod
Sensing plate to be detected
The The output distance and a proximity switch adjustable by a screw
The linear change of the operating rod according to the step of the shift fork.
The transmission shift position
It can be detected frequently. Further, there is very little occurrence of a failure due to a contact failure of the switch itself, and an effect that high reliability and durability of the device can be ensured.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operating state.

FIG. 3 is a configuration diagram illustrating a conventional example.

FIG. 4 is an explanatory diagram of an operating state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Shift fork 12 Step 14 Operating rod 15 Steel ball 16 Switch case 17 Spring 18 Sensing plate 19 Proximity switch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 9/02 H01H 11/00 F16H 63/00

Claims (1)

(57) [Scope of request for utility model registration] 1. The transmission shift position
In a position detection switch device for detecting,
A step is formed on the outer surface of the shift fork in the shift operation direction.
While shifting the surface area including this step.
Operating rod that can move back and forth in the axial direction substantially perpendicular to the
And slide this rod through the piston-like rear end.
Transform the cylindrical switch case that freely supports
Attach it to the mission cover side and attach the operating rod.
The tip of the rod on the outer surface of the fork.
The spring to be contacted and the operating rod
A sensing plate that forms the rear end face
Proximity switch that can adjust the detection distance with a screw facing the rate
Position detecting switch apparatus comprising: the pitch, the.