JP2014019255A - Motor retractor and seat belt device equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress the inclination of a clutch member even if external force is added to the clutch member.SOLUTION: A retainer 12 has a first pawl inclination suppressing portion 12b for suppressing the inclination of a clutch pawl 15, and the first pawl inclination suppressing portion 12b has a pawl inclination suppressing claw 12c. The pawl inclination suppressing claw 12c enters into a second pawl inclination suppressing portion 15b of the clutch pawl 15 when the clutch pawl 15 is set at a clutch connecting position. Therefore, when a locking claw 15c of the clutch pawl 15 engages with a ratchet tooth 19a of an internal gear 19 to prevent a spool 9 from rotating in a seat belt drawing direction, even if the clutch pawl 15 tends to incline by receiving force in the seat belt drawing direction from the internal gear 19, the clutch pawl 15 is retained by the pawl inclination suppressing claw 12c, and the inclination is suppressed.

Description

  The present invention is configured as a seat belt retractor that rotates a spool by the power of an electric motor to wind the seat belt, and transmits a power of the electric motor to the spool by a clutch having a clutch member such as a clutch pawl. The present invention relates to a technical field of a motor retractor having a power transmission mechanism for performing a shut-off and a seat belt device including the same.

  2. Description of the Related Art Conventionally, a seat belt device that has been installed in a vehicle such as an automobile prevents an occupant from jumping out of a seat by restraining the occupant with the seat belt in an emergency such as a vehicle collision. Such a seat belt apparatus includes a seat belt retractor that winds up the seat belt. In this seat belt retractor, the seat belt is wound around the spool when not worn, but is pulled out and worn by the occupant when worn. Then, the seat belt retractor is actuated in the event of an emergency as described above to prevent rotation of the spool in the belt withdrawing direction, thereby preventing the seat belt from being withdrawn. Thereby, the seat belt restrains the occupant in an emergency.

  Power that is configured as a seat belt retractor in a conventional seat belt device and rotates the spool by the power of the electric motor to wind up the seat belt, and transmits or interrupts the power of the electric motor by a clutch having a clutch pawl A seat belt device including a motor retractor having a transmission mechanism is known (see, for example, Patent Document 1).

As shown in FIGS. 6A and 6B, the motor retractor 100 described in Patent Document 1 is rotatably supported by a frame and generates a spool that winds up a seat belt and power that rotates the spool. An electric motor 101; a power transmission mechanism 102 for transmitting the power of the electric motor 101 to the spool; a clutch 103 provided in the power transmission mechanism 102 for transmitting or interrupting the power of the electric motor 101 to the spool; And a retainer 104 on which the power transmission mechanism 102 is disposed. The clutch 103 includes a clutch pawl 105 rotatably provided on the retainer 104, an operation pin 106 made of a metal wire that rotates the clutch pawl 105 in conjunction with the power transmission mechanism 102, and a rotation of the operation pin 106. And a stopper 107 that restricts movement.

  Then, the clutch 103 rotates counterclockwise because the gear 102a of the power transmission mechanism 102 rotates clockwise and the operating pin 106 rotates in the same direction from the connection release position shown in FIG. 6B. And the clutch 103 is set to the connection position shown in FIG. At the connection position of the clutch 103, the locking pawl 105a of the clutch pawl 105 engages with the ratchet teeth 108a of the internal gear 108 of the planetary gear mechanism in the power transmission mechanism 102 (note that the carrier of the planetary gear mechanism is the spool 9). (Refer to Patent Document 1 for details.) This prevents the internal gear 108 from rotating in the belt drawing direction (clockwise in FIG. 6A) and allows the spool to rotate in the belt winding direction.

Further, when the clutch 103 is rotated from the connection position shown in FIG. 6A, the gear 102a of the power transmission mechanism 102 rotates counterclockwise and the operating pin 106 also rotates in the same direction, so that the clutch pawl 105 rotates clockwise. Then, the clutch 103 is switched and set to the connection release position shown in FIG. At the disengagement position of the clutch 103, the locking pawl 105a of the clutch pawl 105 is separated from the ratchet teeth 108a of the internal gear 108. As a result, the internal gear 108 can rotate in either the belt drawing direction or the belt winding direction.

Unexamined-Japanese-Patent No. 2011-161968.

  By the way, when the latching pawl 105a of the clutch pawl 105 is engaged with the ratchet teeth 108a of the internal gear 108 in the belt pull-out direction, when the seat belt is taken up by the power of the electric motor 101, the internal gear 108 moves to the clutch pawl 105. External force is applied. For this reason, the clutch pawl 105 may tilt. When the clutch pawl 105 is tilted in this manner, the engagement margin between the locking claw 105a and the ratchet teeth 108a is reduced, and the engagement strength between the locking claw 105a and the ratchet teeth 108a is reduced.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a motor retractor capable of effectively suppressing the inclination of the clutch member even when an external force is applied to the clutch member, and the same. It is to provide a seat belt device.

  In order to solve the above-described problems, a motor retractor according to the present invention includes a spool that winds up a seat belt, an electric motor that generates power for rotating the spool, a clutch, and the electric motor that includes the clutch. A motor retractor comprising at least a power transmission mechanism for transmitting or interrupting power to the spool and a retainer on which the power transmission mechanism is disposed, wherein the power transmission mechanism is rotatably provided and the electric motor A rotating member that transmits the power of the electric motor for winding the seat belt to the spool by preventing rotation in the belt pull-out direction at the clutch connection position when the seat belt is wound by the power of And the clutch is rotated by the rotation of the power transmission mechanism to And a clutch member that prevents the rotation of the rotating member in the belt pull-out direction by engaging with the rotating member at the clutch connecting position, and the clutch at the clutch connecting position. The retainer is provided with a first clutch member inclination inhibiting portion that inhibits the clutch member from inclining when the member engages with the rotating member and prevents the rotating member from rotating in the belt drawing direction. It is characterized by.

Further, the motor retractor according to the present invention is characterized in that the first clutch member inclination inhibiting portion is integrally provided on the retainer as a single member with the retainer.
Furthermore, in the motor retractor according to the present invention, the first clutch member inclination inhibiting portion has a clutch member inclination inhibiting claw for inhibiting the clutch member from being inclined, and the clutch member is the second clutch member inclination inhibiting. And the clutch member tilt restraining claw of the first clutch member tilt restraining portion abuts against the second clutch member tilt restraining portion at the clutch connection position, thereby restraining the tilt of the clutch member. It is characterized by doing.

  Furthermore, in the motor retractor according to the present invention, the second clutch member tilt restraining portion is formed as a concave groove, and the clutch member tilt restraining claw enters the concave groove at the connection position of the clutch. It is characterized by suppressing the inclination of the member.

  Furthermore, the motor retractor according to the present invention is characterized in that the clutch member is a clutch pawl having a locking claw that can be engaged with the rotating member.

  On the other hand, a seat belt device according to the present invention includes a motor retractor that winds up a seat belt by rotating a spool with an electric motor, and a tongue that is slidably supported by the seat belt drawn from the motor retractor. And a buckle with which the tongue is detachably engaged, and in the seat belt device for restraining an occupant by the seat belt, the motor retractor is any one of the motor retractors of the present invention described above. It is characterized by that.

  According to the motor retractor and the seat belt device of the present invention configured as described above, the retainer is provided with the first clutch member inclination suppressing portion that suppresses the inclination of the clutch member in the clutch engaged state. Therefore, when the seat belt is wound by the power of the electric motor in the clutch connected state, when the clutch member is applied with an external force from the rotating member by the rotating member of the power transmission mechanism trying to rotate in the belt pulling direction, the clutch member Even if it is going to incline, the clutch member can be pressed by the first clutch member inclination inhibiting portion. Thereby, even if an external force is applied to the clutch member from the rotating member, the inclination of the clutch member can be effectively suppressed. As a result, when an external force is applied to the clutch member from the rotating member, it is possible to suppress a reduction in the allowance between the clutch member and the rotating member, and to ensure sufficient engagement strength between the clutch member and the rotating member. It becomes.

  In addition, since the first clutch member inclination suppressing portion is provided integrally with the retainer as a single member, a dedicated component for suppressing the inclination of the clutch member can be eliminated. Thereby, even if the 1st pawl inclination suppression part is provided, the increase in a number of parts and the man-hour of an assembly operation can be prevented.

  Further, the second clutch member inclination inhibiting portion of the clutch member is formed with a concave groove, and the clutch member inclination inhibiting claw of the retainer enters the concave groove of the second clutch member inclination inhibiting portion at the clutch connection position. The inclination of the clutch member is suppressed. As a result, the inclination of the clutch member can be stably and more effectively suppressed.

It is a figure showing typically an example of an embodiment of a seatbelt device provided with an example of an embodiment of a motor retractor concerning the present invention. It is a perspective view which shows an example of embodiment of the motor retractor concerning this invention. (A) is a diagram showing a power transmission mechanism in a state where a clutch is connected, (B) is a diagram showing a power transmission mechanism in a state where a clutch is disconnected, and (C) is a line IIIC-IIIC in (A). It is a fragmentary sectional view which follows. (A) is a front view of the clutch pawl, (B) is a right side view of the clutch pawl, and (C) is a perspective view of the clutch spring. (A) is a diagram showing a surface of the retainer on the power transmission mechanism side (opposite to the frame side), (B) is a diagram showing a frame side surface of the retainer, and (C) is a portion along the VC-VC line in (A). It is sectional drawing. (A) is a figure which shows the power transmission mechanism in the state where the clutch of patent document 1 was connected, (B) is a figure which shows the power transmission mechanism in the state where the clutch of patent document 1 was released. .

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a diagram schematically showing an example of an embodiment of a seat belt apparatus provided with an example of an embodiment of a motor retractor according to the present invention.

  The seat belt device of this example is the same as a conventionally known three-point seat belt device using a motor retractor as shown in FIG. In the figure, 1 is a seat belt device, 2 is a vehicle seat, 3 is a motor retractor that is a seat belt retractor disposed on a vehicle body in the vicinity of the vehicle seat 2, and 4 is wound around a spool of the motor retractor 3 so that it can be pulled out. The front belt anchor 4a is fixed to the floor of the vehicle body or the vehicle seat 2, 5 is a belt guide anchor for guiding the seat belt 4 pulled out from the motor retractor 3 toward the occupant's shoulder, and 6 is this belt. A tongue 7 slidably supported by the seat belt 4 guided from the guide anchor 5 is a buckle fixed to the floor of the vehicle body or the vehicle seat 2 and to which the tongue 6 is detachably inserted. The seatbelt 4 mounting operation and mounting release operation in the seatbelt apparatus 1 are the same as those of a conventionally known seatbelt apparatus.

  As shown in FIG. 2, the motor retractor 3 of this example, like the conventionally known motor retractor, is supported by a U-shaped frame 8 and a frame 8 so as to be rotatable, and is always wound by a conventionally known spring means (not shown). A spool 9 that is energized in the take-up direction and winds up the seat belt 4, an electric motor 10 that generates power for rotating the spool 9, a power transmission mechanism 11 that shifts the power of the electric motor 10 and transmits the power to the spool 9. A retainer 12 in which the electric motor 10 and the power transmission mechanism 11 are disposed, and a retainer cover 13 that is attached to the retainer 12 and covers the power transmission mechanism 11 are provided. The power transmission mechanism 11 is not shown in FIG. 2 because it is covered with the retainer cover 13, but for the sake of convenience of explanation, it is indicated by a dotted lead line.

  The electric motor 10 is rotated by power supplied from a power source and is controlled by a controller (CPU) (not shown). As a result, the spool 9 is rotated and its rotation is controlled.

  3A shows the power transmission mechanism with the clutch engaged, FIG. 3B shows the power transmission mechanism with the clutch disconnected, and FIG. 3C shows the IIIC in FIG. It is a fragmentary sectional view which follows the -IIIC line.

As shown in FIGS. 3A and 3B, the power transmission mechanism 11 is substantially the same as the power transmission mechanism described in Patent Document 1 described above, and includes a planetary gear mechanism. The power transmission mechanism 11 has a clutch 14 that is substantially the same as the clutch described in Patent Document 1 described above. The clutch 14 includes a clutch pawl 15 (corresponding to the clutch member of the present invention in this example) that is substantially the same as the clutch pawl described in Patent Document 1, and a clutch spring 16 that is substantially the same as the operating pin described in Patent Document 1.

4A is a front view of the clutch pawl, FIG. 4B is a right side view of the clutch pawl, and FIG. 4C is a perspective view of the clutch spring.
As shown in FIGS. 4A and 4B, the clutch pawl 15 is formed as a concave groove, and a clutch spring engaging portion 15a and a concave groove, which will be described later, engageable with a pawl engaging portion 16a of the clutch spring 16. The second pawl inclination inhibiting portion 15b formed by

As shown in FIG. 4C, the clutch spring 16 is made of a metal elastic wire, and has a pawl engaging portion 16a for urging the clutch pawl 15 and a substantially annular support portion 16b. . As shown in FIGS. 3A and 3B, the support portion 16b of the clutch spring 16
Is fitted and supported on the rotating shaft 18 of the gear 17 of the power transmission mechanism 11 so as to be rotatable together with the gear 17, and the pawl engaging portion 16 a can be engaged with the clutch spring engaging portion 15 a of the clutch pawl 15. The clutch spring 16 is assembled to the motor.

  Then, in the state where the clutch pawl 15 is in the clutch disengagement position (the position shown in FIG. 3B) where the clutch pawl 15 is disengaged in the same manner as the clutch of the motor retractor described in Patent Document 1, power is transmitted by driving the electric motor 10. When the gear 17 of the mechanism 11 is rotated clockwise in FIG. 3B, the clutch spring 16 is rotated clockwise integrally with the rotation of the gear 17. Then, the clutch pawl 15 rotates counterclockwise around the rotation shaft 18 and is set to a clutch connection position (position shown in FIG. 3A) where the clutch 14 is connected. At the clutch connection position of the clutch 14, the locking pawl 15 c of the clutch pawl 15 engages with the ratchet teeth 19 a of the internal gear 19 of the power transmission mechanism 11, and the internal gear 19 is prevented from rotating in the seat belt pull-out direction. . Thereby, the power transmission mechanism 11 can transmit the power of the electric motor 10 to the spool 9, and the seat belt 4 can be wound by the power of the electric motor 10. At this time, the clutch spring 16 is separated from the stopper 20.

  Further, when the gear 17 is rotated counterclockwise in FIG. 3A by driving the electric motor 10 with the clutch pawl 15 in the clutch engagement position, the clutch spring 16 is integrated with the rotation of the gear 17. Since the clutch pawl 15 is rotated counterclockwise, the clutch pawl 15 rotates clockwise about the rotation shaft 18. When the clutch spring 16 comes into contact with the stopper 20, the rotation of the clutch spring 16 is restricted and stopped, so that the rotation of the clutch pawl 15 is also stopped. Thus, the clutch 14 is set to the clutch disengagement position. At the clutch disengagement position of the clutch 14, the locking pawl 15 c of the clutch pawl 15 is separated from the ratchet teeth 19 a of the internal gear 19, and the internal gear 19 is in either the seat belt withdrawal direction or the seat belt winding direction. Will also be free to rotate. Thereby, transmission of the power of the electric motor 10 to the spool 9 by the power transmission mechanism 11 is blocked.

  5A is a view showing the surface of the retainer on the power transmission mechanism side (opposite side of the frame side), FIG. 5B is a view showing the surface of the retainer on the frame side, and FIG. 5C is FIG. It is a fragmentary sectional view which follows the VC-VC line in A).

As shown in FIGS. 5A and 5B, the retainer 12 has a relatively large opening 12a formed in a substantially circular shape. A rotating shaft 18 of the gear 17 is erected on the surface of the retainer 12 on the power transmission mechanism 11 side.

  Further, the retainer 12 has a first pawl inclination suppressing portion 12 b that suppresses the inclination of the clutch pawl 15. As shown in FIG. 5C, the first pawl inclination restraining portion 12b is formed in an inverted L shape, and a pawl inclination restraining claw 12c is formed at the upper end.

As shown in FIGS. 3A, 3C, and 5C, when the clutch pawl 15 is set to the clutch engagement position, the pawl inclination restraining claw 12c is provided with the second pawl inclination inhibiting portion 15b of the clutch pawl 15. It is supposed to enter inside. As a result, when the seat belt 4 is wound up by the power of the electric motor 10, the locking pawl 15c of the clutch pawl 15 is engaged with the internal gear 19 of the power transmission mechanism 11 (in this example of the present invention) at the clutch connection position of the clutch pawl 15. When the spool 9 is prevented from rotating in the seat belt withdrawing direction by engaging with the ratchet teeth 19a (corresponding to the rotating member), the clutch pawl 15 applies the external force in the seat belt withdrawing direction from the spool 9 via the internal gear 19. The clutch pawl 15 is pressed by the pawl tilt restraining claw 12c even if it tries to tilt. Therefore, even if an external force is applied to the clutch pawl 15 from the internal gear 19, the inclination of the clutch pawl 15 is suppressed.

Other configurations and other operations of the power transmission mechanism 11 having the clutch 14 in this example are substantially the same as those of the clutch described in Patent Document 1 described above. Therefore, it can be easily understood by referring to the description in Patent Document 1, and detailed description thereof will be omitted. In addition, the power transmission mechanism 11 is not limited to this, A conventionally well-known power transmission mechanism provided with the clutch which has a clutch pawl while being used for the conventional motor retractor can also be used.
The other configuration of the motor retractor 3 is the same as that of a conventionally known motor retractor such as the motor retractor described in Patent Document 1 described above.

  According to the motor retractor 3 of this example configured as described above, the retainer 12 is provided with the first pawl inclination suppressing portion 12b that suppresses the inclination of the clutch pawl 15 in the clutch engaged state. Accordingly, when the seat belt 4 is taken up by the power of the electric motor 10 in the clutch engaged state, when the clutch pawl 15 is applied with an external force from the internal gear 19 due to the internal gear 19 trying to rotate in the belt pull-out direction. Even if the clutch pawl 15 tends to tilt, the clutch pawl 15 can be held by the pawl tilt restraining claw 12c of the first pawl tilt restraining portion 12b. Thereby, even if an external force is applied to the clutch pawl 15 from the internal gear 19, the tilt of the clutch pawl 15 can be effectively suppressed. As a result, when an external force is applied to the clutch pawl 15 from the internal gear 19, it is possible to suppress a reduction in the engagement allowance between the clutch pawl 15 and the internal gear 19. Engagement strength can be ensured.

  In addition, since the first pawl inclination restraining portion 12b is provided integrally with the retainer 12 as a single member on the retainer 12, a dedicated component for suppressing the inclination of the clutch pawl 15 can be eliminated. Thereby, even if the 1st pawl inclination suppression part 12b is provided, the increase in a number of parts and the man-hour of an assembly operation can be prevented.

  Further, the second pawl inclination suppressing portion 15b of the clutch pawl 15 is formed as a concave groove, and the pawl inclination suppressing claw 12c of the retainer 12 enters the concave groove of the second pawl inclination suppressing portion 15b at the connection position of the clutch 14. By doing so, the inclination of the clutch pawl 15 is suppressed. Thereby, it becomes possible to suppress the inclination of the clutch pawl 15 stably and more effectively.

  The present invention is not limited to the embodiments described above, and various design changes can be made within the scope of the technical matters described in the claims.

  The motor retractor and the seat belt device of the present invention rotate the spool by the power of the electric motor to wind the belt, and transmit or shut off the power of the electric motor to the spool by a clutch having a clutch pawl. It can utilize suitably for the motor retractor comprised as a seatbelt retractor which has this, and a seatbelt apparatus provided with the same.

DESCRIPTION OF SYMBOLS 1 ... Seat belt apparatus, 3 ... Motor retractor, 4 ... Seat belt, 6 ... Tongue, 7 ... Buckle, 8 ... Frame, 9 ... Spool, 10 ... Electric motor, 11 ... Power transmission mechanism, 12 ... Retainer, 12b ... No. 1 pawl tilt restraining part, 12c ... pawl tilt restraining claw, 14 ... clutch, 15 ... clutch pawl, 15a ... clutch spring engaging part, 15b ... second pawl tilt restraining part, 15c ... locking pawl, 16 ... clutch spring, 16a ... Pawl engaging part, 16b ... Supporting part, 17 ... Gear, 18 ... Rotating shaft, 19 ... Internal gear, 19a ... Ratchet tooth

Claims (6)

A spool that winds up the seat belt;
An electric motor that generates power for rotating the spool, a power transmission mechanism that has a clutch and transmits or interrupts the power of the electric motor to the spool by the clutch, and the power transmission mechanism are provided. A motor retractor comprising at least a retainer,
The power transmission mechanism is provided so as to be rotatable and for winding the seat belt by preventing rotation in a belt pull-out direction at a connection position of the clutch when the seat belt is wound by the power of the electric motor. A rotating member that transmits power of the electric motor to the spool;
The clutch is rotated by the rotation of the power transmission mechanism and is detachably provided on the rotating member. The clutch is engaged with the rotating member at a connection position of the clutch to rotate the rotating member in the belt drawing direction. A clutch member for preventing
A first clutch member inclination inhibiting portion that inhibits the clutch member from inclining when the clutch member engages with the rotating member at the clutch connection position and prevents rotation of the rotating member in the belt pull-out direction; A motor retractor provided on the retainer.   2. The motor retractor according to claim 1, wherein the first clutch member inclination suppressing portion is provided integrally with the retainer as a single member on the retainer. The first clutch member inclination inhibiting portion has a clutch member inclination inhibiting claw that inhibits the clutch member from inclining,
The clutch member has a second clutch member inclination inhibiting portion;
The clutch member tilt restraining claw of the first clutch member tilt restraining portion is in contact with the second clutch member tilt restraining portion at the clutch connection position, thereby restraining the tilt of the clutch member. The motor retractor according to claim 1 or 2. The second clutch member inclination inhibiting portion is formed by a concave groove,
4. The motor retractor according to claim 3, wherein the clutch member inclination restraining claw enters the concave groove at the clutch connection position to suppress the inclination of the clutch member. 5.   5. The motor retractor according to claim 1, wherein the clutch member is a clutch pawl having a locking claw that can be engaged with the rotating member. 6. A motor retractor that winds up a seat belt by rotating a spool with an electric motor, a tongue that is slidably supported by a seat belt pulled out from the motor retractor, and a tongue that is detachably engaged. A seat belt device that includes at least a buckle that restrains an occupant by the seat belt,
The seat belt device according to any one of claims 1 to 5, wherein the motor retractor is the motor retractor.

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