JPH097466A - Cancel device of turn signal switch - Google Patents

Abstract

PURPOSE: To improve quality of a device, and reduce cost by providing an elastic metallic plate-made engaging member having the constitution which returns a switch actuating body existing in an operating position to a neutral position when an operation lever is free and releases force of a cam body when it is locked. CONSTITUTION: An operation lever 15 is put in a rightward turning position, and a steering shaft is rotated leftward, and when a projection 11a of an interlocking cancel cam 11 engages with a cam body 3, a barrel part 3a pushes a tip part 1a of an engaging member 1 in the E direction. Therefore, a switch actuating body 2 rotates around the rotational center 2c, and returns a lever 15 to a neutral position. When the lever 15 is put in a lock state by external force, the tip part 1a of the member 1 its bent by the barrel part 3a, and since the projection 11a of the cam 11 slips out of the tip of the cam body 3, damage of a cancel device can be prevented. The member 1 is composed of a single elastic metallic plate, and dispersion of a value of pressing force when torque of the cam body 3 is released and the number of part items can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turn signal switch for an automobile or the like, and more particularly to a turn signal switch canceling device (hereinafter referred to as canceling device) for automatically returning an operating lever to a neutral position.

[0002]

2. Description of the Related Art A conventional cancel device will be described below.

As shown in FIGS. 5 to 7, reference numeral 11 denotes a cancel cam which is interlocked with the rotation of a steering shaft (not shown) and has two protrusions 11a formed on the outer peripheral portion thereof. Reference numeral 12 denotes a switch case provided on the peripheral portion of the cancel cam 11 and having an open upper surface, and a cover 13 is attached so as to close the upper opening.

Reference numeral 14 denotes a switch actuating member, which is housed in the switch case 12 and is provided with pins 14 provided on the upper and lower sides.
a, 14b are the hole 12a of the switch case 12 and the cover 1
By being fitted into the third hole 13a, it can swing. Reference numeral 15 is an operation lever, which is integrally attached to the switch operating body 14 by a pin 16. Reference numeral 17 is a hole formed in the tip end portion of the switch actuation body 14, into which a moderation pin 19 biased outward by a spring 18 is inserted. Reference numeral 20 denotes a moderation uneven portion formed on the inner surface of the tip of the switch case 12, and the moderation pin 19 is adapted to be fitted into the moderation uneven portion 20.

Reference numeral 21 is a plastic engaging member having protrusions 21a and 21b at its left and right ends. This engaging member 21
A concave groove 22 is formed in the lower surface of the switch operating body 14, and the concave groove 22 is fitted in the protruding wall 24 in the engaging member housing groove 23 of the switch operating body 14. Further, the rear projection 25 of the engaging member 21 has a hole 25.
a, the spring 26 and the sphere 27 are accommodated in the hole 25a, and the engaging member accommodating groove 2 of the switch operating body 14 is provided.
3 is arranged so that the spherical body 27 is located in a concave portion 29 provided at the intersection of the inclined portions 28 that spread to the left and right in FIG.
1 is incorporated in the switch actuator 14.

Reference numeral 30 is a recessed portion provided with a V-shaped projection 32 located on the center line of the switch operating body 14 for restricting the operating range of the cam body 31 provided in the front portion of the switch operating body 14. The cam body 31 has a recessed groove 33 formed on the lower surface thereof, and has pins 31a and 31b serving as rotation fulcrums formed on the upper and lower sides. The spring locking pieces 34 at both ends of the cover 13 have hook portions 35 at both ends.
The body portion of the tension coil spring 35 that locks a and 35b is inserted into the groove 33, and the pin 31a is inserted into the long hole 36 of the cover 13.
The switch 31 and the pin 31b into the recess 30 of the switch operating body 14.
It is assembled so as to be aligned with the V-shaped projection 32 inside. Reference numeral 37 denotes a stopper provided in the switch case 12 for restricting the rotation angle of the switch operating body 14. The cover 13 is fixed to the switch case 12 by a fixing means such as a screw.

The operation of the turn signal switch configured as described above will be described with reference to FIGS. First, when the operation lever 15 is in the neutral position shown in FIG. 7, the moderation pin 19 is fitted into the central concave portion of the moderation uneven portion 20 so that the switch actuation body 14 and the operation lever 15 are held in the neutral position. There is. Also, the cam body 31
Since the pin 31b is located at the apex of the V-shaped projection 32 of the switch actuation body 14, it is located in the direction away from the cancel cam 11 against the elastic force of the tension coil spring 35. As a result, the tip 31c of the cam body 31 is located outside the rotation locus 11b of the protrusion 11a of the cancel cam 11 indicated by the two-dot chain line. Therefore, even if the cancel cam 11 rotates, the cam body 31 is not affected.

FIG. 8 shows a state in which the operating lever 15 is rotated from the neutral position in the direction indicated by the arrow A and is locked and held in the right turn direction position. When the switch actuation body 14 is restricted in rotation by the stopper 37, the moderation pin 19 rides over the convex part of the moderation concave-convex part 20 and is positioned at the inclined part, and is locked in the right turn direction position.

In the process of this operation, the pin 31b of the cam body 31 deviates from the apex of the V-shaped projection 32 of the switch actuating body 14 and comes into contact with the slope 32a of the V-shaped projection 32, and the elastic force of the tension coil spring 35. Thus, the cam body 31 moves in the direction of the cancel cam 11, and the tip end portion 31c of the cam body 31 is positioned inside the rotation locus 11b of the protrusion 11a of the cancel cam 11 indicated by the chain double-dashed line.

The engaging member 21 rotates together with the switch actuating member 14 so that the protrusion 21a of the engaging member 21 contacts the body 31d of the cam member 31.

Although not shown, when the operation lever 15 is rotated from the neutral position in the direction opposite to the direction indicated by the arrow A to the left turn position, the switch actuation body 14 is rotated by the other stopper 37. Being regulated, the moderation pin 19 rides over the other convex part of the moderation concave-convex part 20 and is positioned on the inclined part, and is locked at the left turn direction position. In addition, the pin 31 of the cam body 31
b deviates from the apex of the V-shaped projection 32 of the switch actuation body 14, moves in the direction of the cancel cam 11 by the elastic force of the tension coil spring 35 while contacting the other slope 32b of the V-shaped projection 32, The tip portion 31c of the body 31 is located inside the rotation locus 11b of the protrusion 11a of the cancel cam 11 indicated by the chain double-dashed line.

The engaging member 21 rotates together with the switch actuating member 14, and the other protrusion 21b of the engaging member 21 causes the cam member 3 to move.
It is configured to come into contact with the other body portion 31e.

The operation is the same when the operating lever 15 is operated to the right turning direction position or the left turning direction position, and therefore only the case of the right turning direction position will be described below.

As shown in FIG. 8, when the operating lever 15 is operated to the right turn direction position, the cancel cam 1 is operated.
When 1 is rotated in the same direction, that is, the direction indicated by arrow B,
The protrusion 11a of the cancel cam 11 comes into contact with the tip end side surface 31f of the cam body 31 so that the body portion 31d of the cam body 31 is separated from the one protrusion 21a of the engagement member 21 as indicated by the chain double-dashed line. When the projecting portion 11a of the cancel cam 11 passes by swinging in the direction indicated by C, the cam body 31 returns to the original position by the elastic force of the tension coil spring 35. Then, the switch actuation body 14 and the operation lever 15 are held as they are in the right turn direction position.

Next, as shown in FIG. 9, when the cancel cam 11 is rotated in the opposite direction, that is, in the direction indicated by the arrow B ', the projection 11a of the cancel cam 11 causes the side surface 31g of the tip end portion 31g of the cam body 31. , And the body portion 31d of the cam body 31 is swung in the direction indicated by the arrow C ', engages with the protrusion 21a of the engaging member 21, and presses it in the direction indicated by the arrow C'.

As a result, the engaging member 21 is urged to move in the direction indicated by the arrow D, but the moving urging force is applied to the switch actuation body 14 via the spring 26 and the sphere 27, so that the switch actuation is performed. Body 14 and operating lever 15
Is counteracted by the holding force received from the moderation uneven portion 20 and is rotated in the direction indicated by the arrow A'to return to the neutral position.

Next, in the state shown in FIG. 9 described above, the mechanism for rotating the cancel cam 11 in the direction shown by the arrow B'when the operation lever 15 is locked by the driver's hand or the like will be described. To do.

As shown in FIG. 10, the cancel cam 11
11a of the cam body 31 comes into contact with the side surface 31g of the tip end portion of the cam body 31, the body portion 31d of the cam body 31 is swung in the direction indicated by the arrow C ', and is engaged with the projection portion 21a of the engaging member 21. Then, the protrusion 21a is pressed in the direction indicated by the arrow C '. Here, since the switch actuation body 14 is locked via the operation lever 15, the engagement member 21 compresses the spring 26 in the engagement member 21, and the spring 26 and the sphere 27 are separated from the recess 29 of the switch actuation body 14. It moves in the direction shown by the arrow D while moving to the detached inclined portion 28. Then, when the tip of the projection 11a of the cancel cam 11 passes the tip side surface 31g of the cam body 31, the slider 21 restores the spring 26, the sphere 27, and the inclined portion 28 to restore the force shown in FIG. Return to the state of.

The cancel device operates as described above, but in order to prevent the cancel device from being damaged when the operating lever 15 is locked as described above, in addition to the engaging member 21, the spring 26 is provided. , The spherical body 27, the concave portion 29 of the switch actuating body 14, and the like, and the force at which the engaging member 21 starts to move in order to release the rotational force of the cam body 31 is not stable and the variation is increased. It was a factor. If the force at which the engaging member 21 starts to move is too large, the canceling device is destroyed, while
If the force is too small, the operating lever 15 cannot be automatically returned to the neutral position, and the quality is not sufficiently ensured.

[0020]

As described above, the conventional structure has a problem in that the value of the pressing force when the rotational force of the cam body is released varies widely and the quality is unstable.

The present invention is intended to solve such a conventional problem and to improve the quality by reducing the variation in the value of the pressing force when the rotational force of the cam body is released and reduce the cost by reducing the number of parts. An object of the present invention is to provide a cancel device that can be down.

[0022]

According to the present invention, in order to solve the above-mentioned problems, a switch actuating member which is turned by an operating lever to a first or second operating position via a neutral position is in a neutral position. When a projection provided around the cancel cam is engaged with a cam body that retracts to a non-engagement position, and the switch operating body in the first or second operating position is not locked from the outside by the operating lever. The engaging member is made of a single elastic metal plate and is configured to release the force of the cam body when returned to the neutral position and locked.

[0023]

Therefore, according to the present invention, the single engagement member made of a metal plate is provided so as not to damage the cancel device when the neutral returning operation of the operating lever is performed in the state where the operating lever is locked. As a result, the number of parts can be reduced and the cost can be reduced, and the variation in the value of the pressing force for releasing the rotational force of the cam body can be reduced.

[0024]

An embodiment of the present invention will be described below with reference to the drawings.

In one embodiment of the present invention, the same parts as those described in the above-mentioned conventional example are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIGS. 1 to 3, the present embodiment is characterized in that the switch actuation body 14 of the switch case 12 and the cam body 31 are combined with the conventional construction described above.
The engaging member 21, the spring 26, and the sphere 27, which are parts, are configured to connect the switch actuation body 2 of the switch case 12 and the cam body 3 with only the engaging member 1. That is, the engaging member 1 is made of a single elastic metal plate made of stainless steel having a thickness of 0.2 mm, and is formed in a "H" shape so that the insertion holding portions 2a, 2b of the engaging member 1 of the switch slide body 2 can be formed. By forcing with, it will be fixed in a "U" shape,
A portion engaging with the cam body 3 is formed in a curved shape having a radius of curvature R of 4 mm to increase the moment of inertia. In the figure, 2c indicates the center of rotation of the switch operating body 2, and 3a indicates the body of the cam body 3.

Next, the operation of the above embodiment will be described.
In FIG. 4A, the operation lever 15 is placed in the right turn direction position,
A steering shaft (not shown) is rotated counterclockwise, and the cancel cam 1 is interlocked with the rotation of the steering shaft.
1 rotates in the direction indicated by arrow F, and cancel cam 11
2 shows the state in which the protrusion 11a is engaged with the tip of the cam body 3. In this state, the body portion 3a of the cam body 3 presses the tip end portion 1a of the engaging member 1 in the direction indicated by the arrow E, and the engaging member 1 is fixed to the switch actuating body 2. The switch operating body 2 rotates in the direction of the arrow E, and the operating lever 15 returns to the neutral position.

At this time, the smaller the displacement due to elastic deformation when the cam body 3 presses the tip portion 1a of the engaging member 1, the more stable the function is, and when the displacement is large, the tip portion 1a of the engaging member 1 is stable. The escape may cause a problem that the operation lever 15 does not return to the neutral position. Therefore, in order to increase the moment of inertia for bending in order to reduce the displacement as much as possible, the body portion 3a of the cam body 3 is
The portion including the front end portion 1a of the engaging member 1 engaged with is curved.

Next, as shown in FIG. 4B, the cancel cam 11 is indicated by an arrow F when the operation lever 15 is locked from the outside.
The state is shown when the operation lever 15 is rotated in the direction indicated by to return the operation lever 15 to the neutral position. In this state, the body portion 3a of the cam body 3 presses the engaging member 1 and the predetermined pressing force is applied. When the above is reached, the tip portion 1a of the engaging member 1 bends from the end portion of the insertion holding portion 2a of the engaging member 1 of the switch actuation body 2, and the cam body 3 moves in the direction indicated by the arrow F of the cancel cam 11. The rotation of the cancel cam 11 further rotates in the direction indicated by the arrow E, and the projection 11a of the cancel cam 11 is disengaged from the engagement with the tip portion of the cam body 3, whereby damage to the cancel device can be prevented. When the projection 11a of the cancel cam 11 passes the tip of the cam body 3,
The engaging member 1 returns to its original shape by elastic force.

As described above, according to the above-described embodiment, the three parts of the above-mentioned conventional example, that is, the engaging member 21 and the spring 2 are used.
6. By replacing the spherical body 27 only with the engaging member 1 and forming the insertion holding portions 2a and 2b of the engaging member 1 in the switch operating body 2, the value of the pressing force for releasing the rotational force of the cam body 3 can be reduced. This has the advantages that the variation can be reduced, the quality can be improved, the number of parts can be reduced, and the cost can be reduced.

[0031]

As is apparent from the above embodiment, the present invention is provided with a single elastic metal plate engaging member in which at least a portion pressed by the cam body is curved. There is an effect that the variation in the value of the pressing force when the rotational force of the cam body is released is reduced, the quality is improved, the number of parts is reduced, and the cost can be reduced.

[Brief description of drawings]

1A is a plan view of a main part of a cancel device for a turn signal switch according to an embodiment of the present invention, FIG. 1B is an exploded perspective view of FIG. 1A, and FIG. 1C is an enlarged view of an engagement member of the cancel device. Perspective view

FIG. 2 is a sectional view of the cancel device.

FIG. 3 is an exploded perspective view of the cancel device.

FIG. 4A is a plan view of a main part showing a state in which the operating lever returns to the neutral position in the canceling device, and FIG. 4B is a rotational force of the cam body in the canceling device in a state where the operating lever is locked. Plan view of the main part showing the state when letting go

FIG. 5 is a cross-sectional view of a conventional cancel device for a turn signal switch.

FIG. 6 is an exploded perspective view of the cancel device.

FIG. 7 is a plan view of an essential part showing a state in which the operation lever is in a neutral position in the cancel device.

FIG. 8 is a plan view of relevant parts showing a state in which the operating lever is in the right turn direction position in the cancel device.

9 is a plan view showing an initial state of the cancel device when the steering shaft in the state shown in FIG. 8 is rotated counterclockwise.

FIG. 10 is a plan view showing a state in which the steering shaft in the state shown in FIG. 8 is rotated counterclockwise and the engagement member is operating in the cancel device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engagement member 2 Switch actuation body 3 Cam body 11 Cancel cam 11a Protrusion 13 Cover 15 Operation lever 18 Spring (moderation means) 19 Moderation pin (moderation means) 20 Moderation uneven part (moderation means)

Claims (2)

[Claims] 1. Interlocking with rotation of a steering shaft,
A cancel cam having a protrusion on its periphery, a switch operating body that is rotated by an operating lever to a first or second operating position via a neutral position, and the switch operating body is held in the first or second operating position. And the switch actuating body is in the first or second operating position, and is advanced to a position engageable with the projection of the cancel cam, and the projection is provided when the switch operating body is in the neutral position. A cam body disposed on the upper surface of the switch actuation body that retracts to a non-engagement position, and a cover that rotatably supports the cam body, and engages with the cam body. A single elastic metal plate configured to return the switch operating body in the operating position to the neutral position when the operating lever is not locked from the outside, and release the force of the cam body when the operating lever is locked. Cancellation device of the turn signal switch, characterized in that a engagement member. 2. The single elastic metal plate engaging member has a U-shape, and at least a portion engaging with the cam body is formed in a curved shape so as to increase the moment of inertia. Item 1. A cancel device for a turn signal switch according to item 1.