JP3409581B2 - Turn signal switch cancellation structure - Google Patents

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 switching a vehicle turn signal lamp, and more particularly to a turn signal switch canceling structure for returning the turn signal switch to a neutral position.

[0002]

2. Description of the Related Art Conventionally, a steering wheel of an automobile is equipped with a turn signal switch for switching and operating a vehicular turning indicator light.
The structure shown in No. 446 is known.

As shown in FIG. 5, in the cancel structure of this turn signal switch, an engaging groove 76 is formed in a cylinder 74A of a cancel cam 74 into which a steering shaft 72 interlocking with a steering wheel 70 is inserted. The engaging projection 78 of the steering shaft 72 is engaged with the engaging groove 76. Further, the engagement projection 78 is attached to the cylinder 74A of the cancel cam 74.
By providing the elastic arm 80 for sandwiching, the connecting force of the connecting pin is stabilized, the cancel cam is conventionally biased toward the steering wheel, the connecting hole formed in the steering wheel, and the connecting pin formed in the cancel cam. The compression coil spring used to stabilize the connecting force of is eliminated.

[0004]

However, in the cancel structure of the turn signal switch, the engagement protrusion 78 of the steering shaft 72 is fixed at a constant position even when the steering wheel is in a straight traveling state due to variations in each component. Therefore, the cancel protrusion 82 formed on the cancel cam 74 and the ratchet 86 of the turn signal switch formed on the housing 84 side are displaced in the steering rotation direction, and the cancel position is likely to be displaced.

In view of the above facts, it is an object of the present invention to obtain a cancel structure for a turn signal switch in which the compression coil spring can be eliminated and the cancel position is less likely to shift.

[0006]

According to a first aspect of the present invention, a cancel projection formed on a cancel cam contacts a ratchet of a turn signal switch when rotating in response to an operation of a steering wheel connected to a steering shaft. A cancel structure of a turn signal switch that returns from a left / right switching position to a neutral position by contacting, wherein the cancel cam includes a connected portion to be engaged with a connecting portion of a steering boss of the steering wheel, and the steering shaft. An insertion part to be inserted,
A vertical wall portion formed on the steering boss;
Of the cancel cam that is located opposite to the
And a guide surface for engaging the vertical wall portion and the guide surface.
And a guide portion that guides the cancel cam to a predetermined mounting position of the steering boss and guides the connected portion to the connecting portion of the steering boss.

Therefore, when the steering wheel is attached to the steering shaft inserted in the insertion portion of the cancel cam, the guide cam guides the cancel cam to the predetermined mounting position of the steering boss, and the cancel cam is connected. Since the part is guided to the connecting part provided on the steering boss of the steering wheel, the connected part of the cancel cam is reliably guided to the connecting part of the steering wheel.

The present invention according to claim 2 provides the invention according to claim 1.
In the cancellation structure of the turn signal switch described in
The connecting portion is a connecting hole portion, and the connected portion is a connecting hole portion.
It is a connecting pin, and the insertion portion is a tubular body portion .

Accordingly, the steering shaft is inserted into the cylindrical portion of the cancel cam, when mounting the steering wheel, the guide unit, the cancel cam
Is guided to the predetermined mounting position of the steering boss and the connecting pin of the cancel cam is inserted into the connecting hole provided on the steering boss , so that the connecting pin of the cancel cam is securely attached to the connecting hole of the steering wheel. Is inserted.

Further, the present invention is claimed in claim 3, in canceling the structure of the turn signal switch according to any one of claims 1, 2, wherein the provided in an upper portion of the turn signal switch rotor cancel cam It is characterized by

Accordingly, in addition to the contents of any one of claims 1, 2, since the disposed on the top of the turn signal switch rotor and cancel cam, it is necessary to provide a cancel cam separately Absent.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a cancel structure for a turn signal switch according to the present invention will be described with reference to FIGS.

As shown in FIG. 1, the steering wheel 12 is provided at the upper end 10A of the steering shaft 10.
Are splined together, steering wheel 1
The lock nut 2 is fixed to the steering shaft 10 by a lock nut 14.

As shown in FIG. 2, at the center of the steering wheel 12, a cylindrical steering boss 12A is provided.
From the outer periphery of the steering boss 12A, the steering spokes 12B, 12C, 12D,
12E is protruding. Steering spoke 12B,
12C is linearly extended in the left-right direction, and the front surface (the upper surface in FIG. 2) of the connecting portion between the steering spokes 12B and the steering spokes 12C is a straight vertical wall portion 12F extending in the left-right direction. ing.

As shown in FIG. 1, the steering boss 1
Connection holes 16 and 18 as connection portions are formed on the lower surface of 2A (the surface on the lower side in FIG. 1).

As shown in FIG. 2, the connecting hole portion 16 is formed on the front surface of the steering boss 12A, and has a U-shaped plan cross-section with the outer peripheral side of the steering boss 12A being open. A pair of connecting holes 18 is formed at a position rotated from the connecting hole 16 by a predetermined angle θ (θ <180 °) in the left-right direction, and has a flat cross-sectional shape U that is open on the outer peripheral side of the steering boss 12A. It is shaped like a letter. In these connection hole portions 16 and 18, connection pins 22 and 2 as connection target portions formed in the cancel cam 20 are formed.
4 are inserted respectively.

The relationship between the height of the connecting pins 22 and 24 and the depth of the connecting holes 16 and 18 is as follows.
The length is set in consideration of the variation in the axial direction of 2A, so that the connecting pins 22 and 24 completely enter the connecting holes 16 and 18 and are reliably engaged.

As shown in FIG. 1, the connecting pins 22, 24 are
Is a connecting hole portion 16 of the upper surface 20A of the cancel cam 20,
It is erected at a position opposed to 18. Further, the steering wheel 1 is provided on the upper surface 20A of the cancel cam 20.
The guide portion 26 is provided upright along the vertical wall portion 12F.

As shown in FIG. 2, the guide portion 26 has a rectangular shape extending in the left-right direction in a plan view, and a surface facing the vertical wall portion 12F of the steering wheel 12 is a guide surface 26A. Therefore, when the connecting pins 22 and 24 are inserted into the connecting holes 16 and 18, the guide surface 26A of the guide portion 26 has the guide surface 26A of the vertical wall portion 1 of the steering wheel 12.
It is positioned by 2F. Also,
The steering wheel 12 cannot be assembled unless the positions of the guide surface 26A of the guide portion 26 and the vertical wall portion 12F of the steering wheel 12 are determined.

As shown in FIG. 1, the cancel cam 20 is provided.
A tubular body portion 28 is formed in the center of the lower surface 20B of the steering shaft 10.
Are inserted with the cylindrical portion 32 of the turn signal switch 30 interposed therebetween. The turn signal switch 30 is fixed to the vehicle body side.
On the other hand, the steering shaft 10, the steering wheel 12, and the cancel cam 20 rotate integrally.

As shown in FIG. 3, the cancel cam 20 is provided.
A cancel projection 34 is formed on the outer peripheral portion of the cylindrical body portion 28. The turn signal switch 30 has a well-known structure. When the operating lever 42 is swung in the right direction R and the left direction L, the operating plate 44 is swung, and the ratchet is biased by the leaf spring 46. The reference numeral 48 projects toward the tubular body portion 28 side of the cancel cam 20. When the ratchet 48 projects toward the cancel cam 20, the ratchet 48 moves within the rotation locus of the cancel projection 34 of the cancel cam 20 and interferes with the cancel projection 34.

Next, the operation of this embodiment will be described. In the present embodiment, the steering shaft 10 is inserted into the tubular body portion 28 of the cancel cam 20 with the tubular body portion 32 of the turn signal switch 30 interposed therebetween. By positioning the guide surface 26A of the guide portion 26 by the vertical wall portion 12F of the steering wheel 12, the cancel cam 20 is positioned with respect to the steering wheel 12.

Therefore, since the connecting pins 22 and 24 of the cancel cam 20 are guided by the connecting holes 16 and 18 provided in the steering boss 12A , the connecting pins 22 and 24 are guided.
24 is securely inserted into the connection hole portions 16 and 18.

Therefore, conventionally, the cancel cam is urged toward the steering wheel to stabilize the connecting force between the connecting hole formed in the steering wheel and the connecting pin formed in the cancel cam, and at the time of assembling, the connecting hole is formed. When the position with respect to the connecting pin is displaced, the cancel cam is released in the direction along the steering shaft, and the compression coil spring used to prevent damage to the cancel cam can be eliminated. Further, by eliminating the compression coil spring, sliding noise between the terminal edge of the compression coil spring and the switch body does not occur, and sliding resistance between the terminal edge of the compression coil spring and the switch body does not occur, The rotation torque of the steering wheel can be reduced.

Further, in this embodiment, since the contact between the cancel projection 34 and the ratchet 48 can be adjusted depending on the mounting position of the steering wheel 12, variations in each component can be absorbed by the mounting position of the steering wheel 12. It is possible, and the cancellation position is unlikely to shift.

In the above, the present invention has been described in detail with respect to specific embodiments, but the present invention is not limited to such embodiments, and various other embodiments within the scope of the present invention. It is obvious to a person skilled in the art that For example, in the present embodiment, the steering boss 12
Connecting holes 16 and 18 as connecting portions are formed in A, and connecting pins 22 and 24 as connected portions are formed in the cancel cam 20.
However, the connecting portion and the connected portion are connected hole portions 16,
18 and the connecting pins 22 and 24, for example, the connecting pins 22 and 24 are formed on the steering boss 12A,
The cancel cam 20 may be provided with the connection holes 16 and 18.

Further, as shown in FIG. 4, in the structure in which the rotor 50 such as a spiral cable is arranged above the turn signal switch 30, the rotor 50 serves as a cancel cam, and the steering wheel 1 is provided on the upper surface 50A.
A lock pin as a guide portion 52, a connector housing, etc. are provided upright along the vertical wall portion 12F of the second vertical wall portion 12F, and a canceling protrusion 56 is provided on the outer peripheral portion of the cylindrical body portion 54 formed in the central portion of the lower surface 50B of the rotor 50. You may form.

In this case, since it is not necessary to provide the cancel cam as a separate body, the number of parts can be reduced and the cost can be reduced accordingly. Further, as compared with the case where the rotor is provided separately on the outer peripheral portion of the cancel cam, the inner diameter of the rotor can be made smaller, so that the spiral cable length for obtaining the same number of rotations can be shortened, and also in this respect, the cost can be reduced. is there.

[0029]

According to the first aspect of the present invention, when the steering wheel connected to the steering shaft rotates in response to the operation, the cancel projection formed on the cancel cam abuts the ratchet of the turn signal switch. A cancel structure of a turn signal switch for returning from a switching position to a neutral position, wherein a cancel cam has a connected portion engaged with a connecting portion of a steering boss of a steering wheel, and an inserting portion into which a steering shaft is inserted. Vertical formed on the steering boss
Provided on the wall and the part of the cancel cam that faces the vertical wall
And the guide surface that is formed between the vertical wall and the guide surface.
Engaged to guide the cancel cam to a predetermined mounting position of the steering boss by, since a structure of forming a guide portion for guiding the the connected portion to the connecting portion of the steering boss, and can eliminate the compression coil spring, and It has an excellent effect that the cancellation position is hardly displaced.

The present invention according to claim 2 provides the above-mentioned 1
The cancel structure of the turn signal switch described
The connecting portion is a connecting hole portion, and the connected portion is connected.
Since it is a pin and the insertion portion is a cylindrical body portion, it has an excellent effect that the compression coil spring can be eliminated and the deviation of the cancel position hardly occurs.

Further, the present invention is claimed in claim 3, in canceling the structure of the turn signal switch according to any one of claims 1, 2, and cancel cam and disposed on the top of the turn signal switch rotor Therefore, the compression coil spring can be eliminated, and the cancel position is less likely to be displaced, which is an excellent effect. Further, it has an excellent effect that the number of parts can be reduced and the cost can be reduced accordingly.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a cancel structure of a turn signal switch according to an embodiment of the present invention.

FIG. 2 is a plan view showing a cancel structure of a turn signal switch according to an exemplary embodiment of the present invention.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a side sectional view showing a cancel structure of a turn signal switch according to another embodiment of the present invention.

FIG. 5 is a side sectional view showing a cancel structure of a turn signal switch according to a conventional embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Steering shaft 12 Steering wheel 12A Steering boss 12F Steering wheel vertical wall part 16 Connection hole part (connection part) 18 Connection hole part (connection part) 20 Cancel cam 22 Connection pin (connected part) 24 Connection pin (connected part) ) 26 guide portion 28 tubular body portion 30 turn signal switch 34 canceling protrusion 50 rotor (cancel cam) such as spiral cable 52 guide portion 54 tubular body portion 56 canceling protrusion

Continuation of the front page (56) Reference JP-A-6-211136 (JP, A) Actual opening Sho 62-162141 (JP, U) Actual opening Sho 60-114048 (JP, U) Actual opening Sho 61-1247 (JP , U) Actual development 60-11840 (JP, U) Actual development 64-11858 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B62D 1/00-1/28 B60R 16/02 H01R 35/04

Claims (3)

(57) [Claims] 1. A turn for returning from a left-right switching position to a neutral position when a cancel projection formed on a cancel cam abuts a ratchet of a turn signal switch when the steering wheel connected to a steering shaft rotates in response to an operation. A canceling structure of a signal switch, wherein the cancel cam is formed on the steering boss, a connected part to be engaged with a connecting part of a steering boss of the steering wheel, an inserting part into which the steering shaft is inserted, and the steering boss. Vertical wall portion and the vertical wall
Of the cancel cam that is located opposite to the
And a guide surface for engaging the vertical wall portion and the guide surface.
A guide portion that guides the cancel cam to a predetermined mounting position of the steering boss and guides the connected portion to the connecting portion of the steering boss by combining them. Cancellation structure. 2. The cancel of the turn signal switch according to claim 1, wherein the connected portion is a connecting pin, the connecting portion is a connecting hole portion, and the inserting portion is a cylindrical body portion. Construction. 3. A cancellation structure of the turn signal switch according to the rotor which is disposed above the turn signal switch to any one of claims 1, 2, characterized in that the said cancel cam.