JP2005035398A - Turn signal cancellation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely preventing occurrence of an overrun or reverse-lighting. <P>SOLUTION: When a cancel cam 21 is turned to an arrow B8 direction opposite to the indicated direction in a state where an operation lever 24 and a bracket 23 are positioned in a left turning indicating position, a ratchet 35 is turned to an arrow B9 direction by a canceling protrusion 21a, a pressing part 40 presses a pressed part 29a of a back plate 31, and the bracket 23 is turned to an arrow B2 direction and is turned and returned to a neutral position. At that time, a protrusion 30 of the back plate 31 and a restricting protrusion 41 of the ratchet 35 are abutted, and turning force to the allow B2 direction which is a return direction of the bracket 23 is weakened. Accordingly, the overrun of the bracket 23 and the operation lever 24 and reverse-lighting of a lamp are surely prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a turn signal canceling device configured to automatically rotate and return an operation lever and a bracket instructing a turn direction of a vehicle to a neutral position.

  A conventional configuration of this type of turn signal canceling device will be described with reference to FIGS. First, in FIG. 6, a bracket 2 is provided on the body 1 so as to be rotatable about a shaft portion 2a. The bracket 2 is provided with an operation lever 3 that is rotated together with the bracket 2 and a back plate 4. The back plate 4 is provided with pressed portions 5 facing two places.

  Moderation means 6 is provided between the front end of the bracket 2 and the body 1. The moderation means 6 includes a moderation surface 7 having an uneven portion provided on the body 1 side, a moderation piece 8 provided on the bracket 2 side so as to slide along the moderation surface 7, and the moderation piece 8 And a spring (not shown) for urging the spring to the moderation surface 7 side. The bracket 2 and the operating lever 3 are moved by the moderation means 6 to the neutral position shown in FIG. 6, the left turn instruction position shown in FIG. 7, and the right turn instruction position (not shown) rotated to the opposite side to the left turn instruction position. To be held selectively.

  A ratchet 9 is disposed on the upper surface side of the bracket 2 so as to be positioned between the pressed portions 5 of the back plate 4. The ratchet 9 is biased toward the cancel cam 11 by a spring 10 and is rotatable about a shaft portion 12. In the state of FIG. 6 in which the bracket 2 is positioned at the neutral position, the movement of the ratchet 9 toward the cancel cam 11 is restricted by the cam projection 13 provided on the bracket 2. The opposite side of the ratchet 9 from the tip 9a is a pressing portion 9b. The cancel cam 11 is rotated in the same direction as a steering wheel (not shown).

  In the state shown in FIG. 6 in which the bracket 2 and the operation lever 3 are held at the neutral position in the above-described configuration, the tip end portion 9a of the ratchet 9 is positioned outside the rotation locus 14 of the cancel convex portion 11a of the cancel cam 11. is doing. Then, for example, when the operation lever 3 is rotated in the direction of the arrow A1, and the bracket 2 and the operation lever 3 are rotated to the left turn instruction position shown in FIG. 7, the ratchet 9 is moved in the direction of the arrow A2 and the tip portion 9a. Enters the rotation locus 14 of the cancel projection 13.

  In the state of FIG. 7, the steering wheel is rotated rightward (in the direction of arrow A <b> 3) opposite to the direction indicated by the bracket 2 and the operation lever 3, and the end surface of the canceling convex portion 11 a hits the tip end portion 9 a of the ratchet 9. When 9 is rotated in the direction of arrow A4, the pressing portion 9b of the ratchet 9 presses one pressed portion 5 of the back plate 4, whereby the bracket 2 and the operating lever 3 are opposite to the arrow A1. It is rotated in the direction and returned to the neutral position.

Further, when the bracket 2 and the operation lever 3 are rotated to the right turn instruction position and the steering wheel is rotated in the direction opposite to the instruction direction, the bracket 2 and the operation lever are also operated by the ratchet 9 in the same manner as described above. 3 is returned to the neutral position.
Patent Document 1 also discloses a configuration similar to the above-described conventional configuration.
Japanese Utility Model Publication No. 7-21437

  By the way, in the thing of such a structure, after sending the bracket 2 and the operation lever 3 to the neutral position direction by rotation of the said ratchet 9, since the bracket 2 and the operation lever 3 will be in a free state, these bracket 2 and The so-called overrun (the bracket 2 and the operating lever 3 are thrown into the opposite pointing position beyond the neutral position) due to the rotational force (energy) of the operating lever 3 in the neutral position direction, Reverse lighting (even if it is not turned on to the indicated position on the opposite side) tends to occur even if the contact on the right turn side of the turn signal switch is turned on and the right turn side lamp is temporarily turned on. In particular, when the rotation speed of the steering wheel is fast, the rotational force (energy) when the bracket 2 and the operation lever 3 are turned back to the neutral position also increases, so that the above problem is more likely to occur.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a turn signal canceling device that can reliably prevent the occurrence of overrun and reverse lighting.

In order to achieve the above-described object, the present invention is provided so as to rotate together with the operation lever, and is a bracket that is rotated between a left turn instruction position and a right turn instruction position around a neutral position,
Moderation means for selectively holding the bracket at the neutral position, the left turn instruction position, and the right turn instruction position;
A back plate provided on the bracket and having a pressed portion at two opposite positions;
The steering wheel has a pressing portion positioned between the two pressed portions and is rotatably provided, and the steering wheel is in the direction indicated by the bracket while the bracket is rotated to the left turn instruction position or the right turn instruction position. A ratchet that is rotated by a cancel cam that rotates together with the steering wheel and presses the pressed portion by the pressing portion when rotated in the opposite direction.
In the turn signal canceling device configured to return the bracket to the neutral position based on the pressing of the ratchet against the pressed portion by the pressing portion,
The ratchet is provided with a restriction convex portion that reduces the rotational force in the return direction of the bracket against the back plate when the bracket is rotated and returned from the left turn instruction position or the right turn instruction position to the neutral position by the ratchet. It is provided.

  According to the above-described present invention, when the bracket is rotated and returned from the left turn instruction position or the right turn instruction position to the neutral position by the ratchet, the regulating convex part provided on the ratchet and the back plate provided on the bracket hit each other. Since the rotational force (energy) in the return direction of the bracket is weakened, it is possible to reliably prevent the bracket from overrun and the lamp from being lit in reverse.

  Here, when designing a turn signal canceling device, an attempt to prevent an overrun tends to cause a cancellation error. Conversely, an attempt to prevent a cancellation error tends to cause an overrun, making it difficult to design optimally. There is a circumstance. In this regard, when the structure of the present invention is used, the design can be designed in the overrun direction, and the overrun can be prevented.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 2 and 3, the cancel cam 21 has a cylindrical shape having a cancel convex portion 21a on the outer peripheral portion, and rotates integrally with a steering wheel (not shown). On the right side of the cancel cam 21, a body 22 having a rectangular box shape having openings on the left and right sides is provided in a fixed state. A bracket 23 is provided in the body 22 so as to be rotatable about a shaft portion 23a. A base end portion of an operation lever 24 is connected to the bracket 23.

  A moderation surface portion 25 is provided on the inner surface on the left side of the body 22. The moderation surface portion 25 has two peak portions 25a and 25b and one valley portion 25c. A moderation piece 27 urged in a direction in which the moderation spring 26 (see FIG. 9) presses against the moderation surface 25 is provided at the distal end portion of the bracket 3, and the moderation surface 25 and the moderation spring 26 are provided. The moderation piece 27 constitutes a moderation means 28 having a known configuration. Thus, the bracket 23 and the operation lever 24 are rotated in the neutral position shown in FIGS. 2 and 3 where the moderation piece 27 is located in the valley portion 25c of the moderation surface portion 25, and from there in the direction of the arrow B1. The left turn instruction position (see FIG. 4) that rides on one peak 25 a of the moderation surface 25 and the other peak of the moderation surface 25 by rotating in the direction of the arrow B <b> 2 opposite to the arrow B <b> 1. It is selectively held at a right turn instruction position (not shown) that rides on 25b. Although not shown, the body 22 is provided with a turn signal switch that switches the contact point according to the rotation position of the bracket 23.

  A back plate 31 having two convex portions 29 and 30 and having a substantially U-shape as a whole is attached to a substantially central portion of the upper surface of the bracket 23 so as to be slidable in the directions of arrows B3 and B4. A back plate spring 32 is provided between the back plate 31 and the bracket 23 to hold the back plate 31 at a middle position shown in FIG. In the back plate 31, the opposed inner surfaces of the two convex portions 29, 30 are pressed portions 29a, 30a. Further, on the left side of the upper surface of the bracket 23, a cam portion 34 having a triangular peak portion 34a is provided.

  Further, a ratchet 35 is disposed on the upper surface portion of the bracket 23. The ratchet 35 is provided with a shaft portion 36 protruding in the upper and lower sides at the middle portion in the longitudinal direction, and an upper end portion of the shaft portion 36 is attached to the upper surface portion of the body 22 (see FIG. 3). It is inserted in a guide hole 38 made of a long hole so as to be movable and rotatable, and the lower end portion of the shaft portion 36 is provided so as to move along the cam portion 34. Further, the ratchet 35 is urged by a ratchet spring 39 in the direction of the arrow B5 (on the cancel cam 21 side). An end of the ratchet 35 opposite to the tip 35 a is a pressing portion 40, and the pressing portion 40 is disposed between the two pressed portions 29 a and 30 a in the back plate 31. Then, two restricting convex portions 41 that protrude toward the convex portions 29 and 30 of the back plate 31 are integrally provided on both side portions of the ratchet 35.

  Next, the operation of the above configuration will be described. In the state where the bracket 23 and the operation lever 24 are positioned at the neutral position shown in FIG. 2, the lower end portion of the shaft portion 36 of the ratchet 35 is positioned at the apex of the peak portion 34 a in the cam portion 34. The tip 35a is held at a position retracted from the rotation locus K of the cancel projection 21a (see the two-dot chain line in FIG. 2).

  When the operation lever 24 is rotated from the neutral position in the direction of the arrow B1, for example, and the bracket 23 and the operation lever 24 are positioned at the left turn instruction position shown in FIG. While moving along the slope of the portion 34a, the urging force of the ratchet spring 39 moves forward in the direction of the arrow B5, and the tip 35a enters the rotation locus K of the cancel projection 21a.

  In this state, if the cancel cam 21 is rotated counterclockwise (rotated in the direction of arrow B6) by the steering wheel by the steering wheel, the cancel convex portion 21a of the cancel cam 21 enters the rotation locus K. The ratchet 35 hits the tip 35a of the ratchet 35 and rotates in the direction of the arrow B7. The rotation direction is the direction in which the pressing portion 40 of the ratchet 35 separates from the pressed portion 29a of the back plate 31. The cancel cam 21 is allowed to rotate in the arrow B6 direction while being held at the left turn instruction position.

  On the other hand, in the state of FIG. 4, when the cancel cam 21 is rotated by the steering wheel in the arrow B8 direction opposite to the direction indicated by the bracket 3, the cancel convex portion 21 a hits the tip end portion 35 a of the ratchet 35, The ratchet 35 is rotated about the shaft portion 36 in the direction of arrow B9, and the pressing portion 40 at the rear end presses the pressed portion 29a of the back plate 31 in the direction of arrow B9. When the pressing force exceeds the holding force of the moderation means 7, the bracket 23 and the operation lever 24 are rotated in the direction of the arrow B <b> 2 and returned to the neutral position. FIG. 1 shows a state at the moment when the bracket 23 and the operating lever 24 are fed in the neutral position direction by the ratchet 35. In the state of FIG. 1, the tip end portion of one restricting convex portion 41 of the ratchet 35 is located in the vicinity of the tip end portion of the one convex portion 30 of the back plate 31.

  Here, in the state of FIG. 1, when the bracket 23 and the operation lever 24 are rotated in the direction of the arrow B <b> 2 by the ratchet 35, one end of the convex portion 30 of the back plate 31 and one regulation of the ratchet 35. The leading end of the convex portion 41 hits, and the rotational force (energy) in the direction of the arrow B2, which is the return direction of the bracket 23 and the operation lever 24, is weakened. For this reason, it is possible to reliably prevent the bracket 23 and the operation lever 24 from overrunning and the lamp from being lit in reverse.

  On the other hand, when the cancel operation as described above is performed, for example, when there is a so-called biting such that the driver holds the operation lever 24 and fixes it to the left turn instruction position, the back plate 31 is pressed from the pressing portion 40 of the ratchet 35. An excessive pressing force exceeding the holding force by the back plate spring 32 acts on the pressed portion 29a. Then, as shown in FIG. 5, the back plate 31 moves in the direction of the arrow B3 to allow the cancellation convex portion 21a to pass in the direction of the arrow B8. Thereby, it is possible to prevent the ratchet 35 and the back plate 31 from being damaged when the operation lever 24 bites.

The above-described operation is performed when the bracket 23 and the operation lever 24 are rotated to the left turn instruction position. However, the same operation is performed when the bracket 23 and the operation lever 24 are rotated to the right turn instruction position. Become.
According to the above-described embodiment, when the ratchet 35 is provided with the restricting convex portions 41, 41, when the bracket 23 is rotated and returned from the left turn instruction position or the right turn instruction position to the neutral position by the ratchet 35, the restriction is provided. The convex portion 41 and the convex portion 29 or 30 of the back plate 31 come into contact with each other so that the rotational force in the return direction of the bracket 35 is weakened, and the bracket 35 is overrun or the lamp is lit in reverse. It can be surely prevented. Further, in this case, since it is possible to cope with a simple configuration in which the ratchet 35 is provided with the restricting convex portion 41, it is not necessary to increase the number of parts.

The top view of the principal part of the state of the moment which shows one Embodiment of this invention and has fully sent a bracket with a ratchet Transverse plan view with bracket in neutral position Vertical section in the same state Top view of the main part with the bracket in the left turn instruction position The top view of the principal part which shows the state which permits passage of a cancellation convex part in the state (at the time of biting) where the bracket was fixed to the left turn instruction position FIG. 2 equivalent diagram showing a conventional example 4 equivalent diagram

Explanation of symbols

In the drawings, 21 is a cancel cam, 21a is a cancel convex part, 23 is a bracket, 23a is a shaft part, 24 is an operation lever, 25 is a moderation surface part, 27 is a moderation piece, 28 is a moderation means, 29 and 30 are convex parts, 29a and 30a are pressed parts, 31 is a back plate, 35 is a ratchet, 40 is a pressing part, and 41 is a regulating convex part.

Claims (1)

A bracket provided to rotate together with the operation lever, and rotated between a left turn instruction position and a right turn instruction position around a neutral position;
Moderation means for selectively holding the bracket at the neutral position, the left turn instruction position, and the right turn instruction position;
A back plate provided on the bracket and having a pressed portion at two opposite positions;
The steering wheel has a pressing portion positioned between the two pressed portions and is rotatably provided, and the steering wheel is in the direction indicated by the bracket while the bracket is rotated to the left turn instruction position or the right turn instruction position. A ratchet that is rotated by a cancel cam that rotates together with the steering wheel and presses the pressed portion by the pressing portion when rotated in the opposite direction.
In the turn signal canceling device configured to return the bracket to the neutral position based on the pressing of the ratchet against the pressed portion by the pressing portion,
The ratchet is provided with a restriction convex portion that reduces the rotational force in the return direction of the bracket against the back plate when the bracket is rotated and returned from the left turn instruction position or the right turn instruction position to the neutral position by the ratchet. A turn signal canceling device characterized by being provided.

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