JPH0747773Y2 - Transmission position switch - Google Patents

Description

The present invention relates to a position switch for a transmission.

2. Description of the Related Art Conventionally, a rotor having movable contacts is rotatably mounted on the bottom of a case closed by a cover plate, and a plurality of fixed contacts that contact the movable contacts are arranged around the rotor. There is. This position switch connects the rotor to the gearshift lever of the transmission operating device,
The rotor is rotated according to the position of the gear shift lever that is operated to an arbitrary position, and the contact switching operation at this time drives the controller according to the position of the gear shift lever to perform the gear shift operation of the transmission. is there. For this reason, the movable contact and the fixed contact are connected to an external circuit, but since the fixed contact is always in a fixed position, it may be connected simply by a cord, but since the position of the movable contact changes, a lid made of sheet metal is used. A conductive washer connected to the movable contact is interposed between the rotor and the rotor, and the cord soldered to the cover plate is connected to the external circuit. Large vehicles often use a multi-speed transmission such as 10 speed,
As a result, the number of movable contacts of the position switch also increases, and the relative position between the operating device of the transmission and the position switch can be observed while observing the contact state between the movable contact and the fixed contact that are determined according to the position of the gear shift lever. It is necessary to determine and combine both. Therefore, a window corresponding to the fixed contact is opened in the cover plate of the position switch.

Problems to be Solved by the Invention In the automobile industry, the transmission operating device and the position switch may be assembled in the vehicle at the export destination. Depending on the country, assembly work may be forced in the outdoors where dust particles fly, and in this case, there is a problem that dust particles and other foreign matter enter from the window of the position switch, and the reliability of the position switch is reduced.

Means for Solving the Problems A rotor connected to a shift lever of a transmission operating device is rotatably mounted on a bottom portion of a case having an opening surface formed on one surface, and a plurality of fixed members each connected to an external circuit. The contacts are arranged with the axial center of the rotor as the center of the radius, and the rotor is provided with a movable contact that contacts the fixed contacts.
An insulating cover plate having a transparent portion facing at least a part of the movable contact is attached to the opening surface of the case, and a conductive contact connected to the movable contact is provided on the rotor, and the contact is made. A conductive layer that contacts the child and is partially connected to an external circuit is formed on the inner surface of the lid plate.

The foreign matter can be surely prevented from entering the case by the cover plate having the transparent portion, and the position switch and the transmission operating device can be seen while observing the contact state between the movable contact and the fixed contact from the transparent portion. The relative position can be adjusted easily and accurately, and the cover plate is formed of an insulating member, but the movable contact is provided via the contactor provided on the rotor and the conductive layer formed on the inner surface of the cover plate. Can be connected to an external circuit.

Embodiment An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 shown in FIG. 1 is a part of a vehicle body of a large automobile, and a transmission operating device 2 is attached to the vehicle body 1. The transmission operating device 2 includes a box 3 attached to the vehicle body 1, a shaft 4 rotatably supported by the box 3, an operating lever 5 screwed to the shaft 4, and a box 3 holding the operation lever 5. The lock body 6 is elastically engaged with the operation lever 5 by being engaged. The locking body 6 has a plurality of recesses 6a, and the recesses 6a stabilize the operating lever 5 at an arbitrary operating position. Further, a plurality of columns 7 formed in the box 3
A position switch 8 is attached to.

The position switches 8 are arranged in a flat case 9 and concentric circles at the bottom of the case 9 so that the terminals 10
Fixed contacts 11 connected to the
A rotor 14 rotatably supported by the case 9 and having a movable contact 12 for elastically holding and a conductive contact 13 connected to the movable contact 12; And a connecting member 15 which is fitted to the shaft 4 while being prevented from rotating.
And a lid plate 17 made of glass epoxy fixed to the opening surface 16 of the case 9. The fixed contacts 11 are arranged on a radius centered on the rotation axis of the rotor 14, and three transparent portions 18 respectively facing one of the fixed contacts 11 are formed on the cover plate 17 at predetermined intervals. Has been done.

FIG. 2 is a front view of the position switch 8. Each terminal 10 is soldered with a cord 19 connected to an external circuit. Further, the case 9 of the position switch 8 is formed with a plurality of mounting holes 20 which are screwed to the columns 7 of the transmission operating device 2. These mounting holes 20
Is defined as an oval shape along a radius centered on the rotation axis of the rotor 14.

FIG. 3 is a rear view of the position switch 8, which is the cover plate 17
Is fixed to the case 9 by a plurality of screws 21.
A conductive layer 22 made of foil is formed on the inner surface of the. The conductive layer 22 is formed over a predetermined range so as to always contact the contactor 13. A cord 23 connected to an external circuit is inserted into a hole 24 formed on the conductive layer 22 of the cover plate 17 and soldered to the conductive layer 22.

FIG. 4 is a rear view showing the inside of the position switch 8 with the cover plate 17 removed. The case 21 has screws 21 for fixing the cover plate 17.
With a plurality of screw holes 25, a stopper 26 that engages with a notch 30 formed on the outer periphery of the rotor 14 to regulate the rotation angle of the rotor 14, and a bank that surrounds the outer periphery of the cover plate 17. Part 27
And are formed. Recesses 28 into which one end of the fixed contact 11 is fitted are formed in the bank portion 27. These recesses 28 are formed after the cover plate 17 is fixed, as shown in FIGS. 1 and 3. It is sealed by press-fitting a stopper 29 made of an elastic material. Further, as shown in FIG. 4, the rotor 14 has three movable contacts 12.

In such a configuration, when the position switch 8 is assembled to the transmission operating device 2, it is assembled while adjusting the relative position within the range of the length of the mounting hole 20. That is, three positions of the operation lever 5 where the fixed contact 11 and the movable contact 12 facing the transparent portion 18 contact each other are selected, and the center of the fixed contact 11 contacts the center of the movable contact 12 at each position. Then, the case 9 is displaced with respect to the box 3 and the two are connected by a screw. At this time, the transparent portion 18 of the lid plate 17 is not formed by the opening, and therefore, invasion of dust and the like can be surely blocked.

In addition, the rotor 14 rotates in 10 positions corresponding to the number of fixed contacts 11 in a range of approximately 47 degrees, but in FIG. 4, the rotor 14 rotates counterclockwise from the right side to the left side. In the process of making, the three movable contacts 12 come into contact with the fixed contact 11 in order from the one located on the right side. When viewed from the fixed contact 11 side, in FIG. 4, when the rotor 14 is rotated counterclockwise from the right side to the left side, the order of the fixed contacts 11 contacting the movable contact 12 is from right to left. , 1st, 4th
No. 7, No. 7, No. 10, No. 2, No. 5, No. 8, No. 3,
No. 6, No. 6 and No. 9. Therefore, although the rotation angle of the rotor 14 is narrow and the number of fixed contacts 11 is large, it is possible to widen the arrangement interval of the fixed contacts 11 and effectively prevent a failure such as a short circuit.

In the above embodiment, the transparent portion 18 is formed by hermetically fitting a transparent plate such as acrylic into the hole formed in the lid plate 17, but the entire lid plate 17 may be formed by a transparent plate. .

Effect of the Invention As described above, according to the present invention, by closing the opening surface of the case with the cover plate having the transparent portion, it is possible to reliably prevent foreign matter from entering the inside and enhance the reliability of contact switching. Also, the relative position of the position switch and the transmission operating device can be easily and accurately adjusted while observing the contact state between the movable contact and the fixed contact from the transparent portion, and the cover plate is formed of an insulating member. However, the movable contact can be connected to an external circuit through the contact provided on the rotor and the conductive layer formed on the inner surface of the cover plate.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a vertical sectional side view showing an assembled state of an operating device and a position switch, FIG. 2 is a front view of the position switch, and FIG. 3 is a rear view of the position switch. 4 and 5 are rear views showing the inside of the position switch. 2 ... transmission operating device, 5 ... gearshift lever, 9 ... case, 11 ... fixed contact, 12 ... movable contact, 13 ... contactor,
14 …… Rotor, 16 …… Opening surface, 17 …… Cover plate, 18 …… Transparent part, 22 …… Conductive layer

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A case having an opening formed on one surface, a rotor rotatably held at the bottom of the case and connected to a speed change lever of a transmission operating device, and a shaft center of the rotor of a radius. A plurality of fixed contacts arranged in the case as a center and connected to an external circuit respectively, a movable contact held by the rotor and in contact with the fixed contact, and at least a part of the fixed contacts facing the movable contact. An insulating cover plate having a transparent portion and attached to the opening surface of the case, a conductive contact held by the rotor and connected to the movable contact, and formed on the inner surface of the cover plate A position switch for a transmission, comprising a conductive layer which is brought into contact with the contactor and is partially connected to an external circuit.