KR102149719B1 - Seat belt retractor - Google Patents

Abstract

When the webbing is wound up, the occurrence of end locks in the seat belt retractor is reliably suppressed. The locking mechanism operates by displacement of the lock arm 40 in the locking operation direction, and stops rotation of the take-up drum in the take-out direction. The regulating member 56 regulates the displacement of the lock arm 40 in the locking operation direction due to the recoil of the rotation stop in the winding direction M of the winding drum. The pressing portion 57 of the regulating member 56 contacts the lock arm 40 when rotating in the winding direction M of the winding drum and presses the lock arm 40 displaced in the locking operation direction. The engaging portion 44 of the lock arm 40 is engaged with the pressing portion 57 of the regulating member 56, and the locking arm 40 is pressed by the pressing portion 57 of the regulating member 56. Keep.

Description

Seat belt retractor {SEAT BELT RETRACTOR}

The present invention relates to a seat belt retractor for winding up a webbing of a seat belt on a rotatable winding drum.

Vehicles such as automobiles are generally equipped with a seat belt device having a retractor in order to protect an occupant sitting on a seat. The occupant attaches the webbing (seat belt) drawn out from the take-up drum of the retractor, and is constrained to the seat by the webbing. When the webbing is abruptly taken out by the movement of the occupant, the rotation of the take-up drum in the take-out direction is stopped by the locking mechanism of the retractor, and the take-out of the webbing is stopped.

Further, the webbing removed from the occupant is wound up on a rotating take-up drum, and is accommodated in the retractor until next taken out. By the way, when the winding of the webbing is finished, the locking mechanism may operate by mistake due to the reaction of the rotation stop of the winding drum. When the lock mechanism operates, rotation of the take-up drum in the take-out direction is stopped, and the webbing cannot be taken out of the take-up drum. At the same time, since the entire webbing is wound up, the webbing cannot be wound up, and end locks are generated in the retractor. On the other hand, conventionally, there is known a retractor that suppresses rotation of a flywheel for operating a lock mechanism by a friction spring (see Patent Document 1).

However, in the conventional retractor described in Patent Document 1, when the friction spring is pressed by the flywheel, the contact position between the friction spring and the flywheel is changed, and there is a concern that the friction spring may rotate. For this reason, when the force to rotate the flywheel is increased corresponding to the winding speed of the webbing, it becomes difficult to suppress the rotation of the flywheel by the friction spring. Therefore, with respect to the conventional retractor, there is room for improvement from the viewpoint of more reliably suppressing the occurrence of end locks due to malfunction of the lock mechanism.

Japanese Patent No. 4758967

The present invention has been made in view of the above conventional problems, and its object is to reliably suppress the occurrence of end locks in the seat belt retractor when the webbing is wound up.

The present invention relates to a take-up drum rotatable in the take-up and take-out direction of the webbing, a displacement member that rotates together with the take-up drum and is displaceable in the lock operation direction according to the acceleration in the take-out direction of the take-up drum, and the lock operation direction of the displacement member. A locking mechanism that operates by displacement in the winding direction and stops rotation in the withdrawal direction of the winding drum, and a restricting member that regulates the displacement of the displacement member in the locking operation direction by recoil of the rotation stop of the winding drum in the winding direction. A retractor for a seat belt, wherein the regulating member is separated from the displacement member when rotating in the take-up direction of the take-up drum, and a displacement member that contacts the displacement member when rotating in the winding direction of the take-up drum and displaces in the locking operation direction. It is a seat belt retractor having a pressing portion for pressing, a displacement member engaging the pressing portion of the regulating member, and having an engaging portion for holding the regulating member in a state in which the displacement member is pressed by the pressing portion.

According to the present invention, it is possible to reliably suppress the occurrence of end locks in the seat belt retractor when the webbing is wound up.

1 is a perspective view of a seat belt retractor according to the present embodiment.
2 is a perspective view of the disassembled seat belt retractor.
3 is a perspective view of a fully exploded seat belt retractor.
4 is a perspective view of a fully exploded seat belt retractor.
Fig. 5 is a cross-sectional view of a seat belt retractor viewed along the line X1-X1 in Fig. 1 in the direction of an arrow.
Fig. 6 is a cross-sectional view of a seat belt retractor viewed along the line X2-X2 in Fig. 1 in the direction of the arrow.
7 is a perspective view of the disassembled winding drum unit.
8 is a perspective view of the disassembled clutch unit.
Fig. 9 is a front view of a take-up drum containing a movable foul.
Fig. 10 is a side view of the take-up drum viewed from the direction W3 in Fig. 9;
11 is a perspective view of an acceleration sensor, a mechanism cover and a regulating member.
12 is a cross-sectional view of the mechanism cover unit viewed from the direction W4 in FIG. 11.
Fig. 13 is a diagram showing the operation of the lock arm when the webbing is taken out.
Fig. 14 is a diagram showing the operation of the lock arm when the webbing is wound up.
15 is a diagram showing a regulating member for regulating the displacement of the lock arm.
Fig. 16 is a diagram showing the operation of the retractor during end lock.
Fig. 17 is a diagram showing the operation of the retractor during end lock.
18 is a view showing a process in which the lock arm and the stop are disengaged.
19 is a side view of the retractor viewed from the direction W5 in FIG. 4.
20 is a perspective view of an operation member and an arrangement member.
21 is a cross-sectional view of a portion Y2 of FIG. 19.
22 is a diagram showing an operation of an arrangement member accompanying rotation of the moving member.
23 is a diagram showing an operation of an arrangement member accompanying rotation of the moving member.
Fig. 24 is a diagram showing an operation of an arrangement member accompanying rotation of the moving member.

An embodiment of a seat belt retractor (hereinafter referred to as a retractor) of the present invention will be described with reference to the drawings.

The retractor of this embodiment is a webbing take-up device for winding up a webbing of a seat belt, and is installed in a vehicle seat belt device. A seat belt device equipped with a retractor is mounted on a vehicle and protects an occupant seated on the seat by webbing (seat belt).

1 is a perspective view of a retractor 1 of the present embodiment. Fig. 2 is a perspective view showing the disassembled retractor 1 viewed from the direction W1 in Fig. 1, and shows the retractor 1 disassembled into a plurality of units. In Figs. 1 and 2, the strip-shaped webbing 2 is indicated by a dotted line.

As shown, the retractor 1 includes a housing unit 3, a take-up drum unit 4 having a take-up drum 10 of the webbing 2, a take-up spring unit 5, and a mechanism cover unit ( 6) and a drop-out prevention pin 7 fixed to the end of the webbing 2 are provided.

With the take-up drum 10 disposed in the housing unit 3, the take-up spring unit 5 and the mechanism cover unit 6 are fixed to the side of the housing unit 3. The take-up spring unit 5 and the mechanism cover unit 6 cover both ends of the take-up drum unit 4 in the axial direction from the outside of the housing unit 3 and support the take-up drum unit 4 rotatably. Further, the webbing 2 is inserted into the insertion portion 11 of the take-up drum 10, and the webbing 2 is prevented from being detached from the insertion portion 11 by the anti-removal pin 7. Thereby, the end of the webbing 2 is attached to the take-up drum 10.

The take-up spring unit 5 is a take-up means for winding the webbing 2 around the take-up drum 10, and the direction of rotation (referred to as the take-up direction) when the take-up drum 10 is wound up the webbing 2 ( M). The webbing 2 is wound around a rotating take-up drum 10 and accommodated in the retractor 1. From that state, the webbing 2 is pulled out from the retractor 1 while rotating the take-up drum 10 in the rotational direction (referred to as a pull-out direction) P at the time of pulling out the webbing 2.

The take-up drum unit 4 has a clutch unit 8 and rotates in the take-up direction M and the take-out direction P within the retractor 1. The take-up drum 10 rotates together with the clutch unit 8 in normal times, and rotates independently of the clutch unit 8 in an emergency or the like. The mechanism cover unit 6 constitutes a lock mechanism 9 that covers the clutch unit 8 of the take-up drum unit 4 and stops rotation of the take-up drum 10 together with the clutch unit 8. The locking mechanism 9 is a locking means for locking the take-up drum 10 rotating in the drawing direction P. In response to a rapid withdrawal of the webbing 2 or a rapid change in vehicle speed, the rotation of the take-up direction P of the take-up drum 10 is stopped by the lock mechanism 9. By the operation of the locking mechanism 9, the withdrawal of the webbing 2 is stopped.

3 and 4 are perspective views of the retractor 1 completely disassembled, showing the retractor 1 viewed from different directions. Fig. 3 shows the retractor 1 viewed from the same direction as in Fig. 1, and Fig. 4 shows the retractor 1 viewed from the direction W2 in Fig. 1.

As shown, the units 3 to 6 of the retractor 1 are assembled by combining a plurality of parts. Further, by incorporating a plurality of units 3 to 6, the retractor 1 is manufactured. Hereinafter, each part of these retractors 1 will be described in detail in order.

The housing unit 3 has a housing 20 for accommodating the take-up drum 10 and a protector 3A made of synthetic resin. The housing 20 includes a back plate part 21 fixed to the vehicle body, and a pair of side wall parts 22 and 23 protruding from both side edges of the back board part 21 (the first side wall part 22, the second side wall part Part 23], and a fixing plate 24 fixed to the pair of side wall parts 22 and 23. The protector 3A has a passage portion 3B of the webbing 2 and is provided on an upper edge portion of the back plate portion 21. The webbing 2 passes through the passage portion 3B of the protector 3A, and passes through the passage portion 3B at the time of winding and pulling out.

The housing 20 includes a circular first opening 25 formed in the first side wall 22, a plurality of lock teeth 26 protruding inward of the first opening 25, and a second side wall part ( It has a second opening 27 formed in 23). The plurality of lock teeth 26 have a triangular shape, and are formed over the entire inner periphery of the first opening 25. When the movable pawls 4A of the take-up drum unit 4 engage with the lock teeth 26, the take-up drum 10 is locked, and rotation of the take-out direction P of the take-up drum 10 is stopped. The second opening 27 is formed larger than the first opening 25 and faces the first opening 25.

The winding drum 10 is inserted into the first opening 25 and accommodated in the housing 20. Further, both ends of the take-up drum 10 are disposed in the first opening 25 and the second opening 27, respectively, and the clutch unit 8 is disposed on the side of the first side wall 22. In that state, the mechanism cover unit 6 is installed on the first side wall portion 22 and the winding spring unit 5 is installed on the second side wall portion 23.

5 is a cross-sectional view of the retractor 1 viewed in the direction of the arrow along the line X1-X1 in FIG. 1, and FIG. 6 is a cross-sectional view of the retractor 1 viewed in the direction of the arrow along the line X2-X2 in FIG.

As shown, in a state in which the axial center of the winding drum 10 coincides with the center of the first opening 25, the winding drum 10 includes the housing 20, the first opening 25, and the second opening 27 ) Rotate within. In addition, the winding drum 10 has a pair of shafts 12 and 13 (first shaft 12 and second shaft 13) protruding laterally along the axial center. The mechanism cover unit 6 is combined with the clutch unit 8 to rotatably support the first shaft 12. The winding spring unit 5 is connected to the second shaft 13 to support the second shaft 13 so as to be rotatable.

The winding spring unit 5 (refer to FIGS. 3 and 4) is attached to the spiral spring 5A, the spring case 5B accommodating the spiral spring 5A, and the second side wall 23 of the housing 20. It has a spring seat 5C in contact and a spring shaft 5D. The outer end K1 of the spiral spring 5A is fixed to the spring case 5B, and the inner end K2 of the spiral spring 5B is fixed to the spring shaft 5D. The spring seat 5C is attached to the spring case 5B, and covers the spiral spring 5A in the spring case 5B. In that state, the spring shaft 5D is rotatably installed on the spring case 5B and the spring seat 5C. The second shaft 13 of the take-up drum 10 is inserted into the support hole 5E and is rotatably supported by the spring seat 5C, and is fixed to the spring shaft 5D.

The spring shaft 5D rotates integrally with the take-up drum 10 and transmits a pressing force of the spiral spring 5A to the take-up drum 10. The take-up spring unit 5 always presses the take-up drum 10 in the take-up direction M of the webbing 2 by the spiral spring 5A. Further, when the webbing 2 is taken out, the spiral spring 5A is wound by the rotation of the take-up drum 10. When the webbing 2 is wound up, the take-up drum unit 4 and the take-up drum 10 rotate in the take-up direction M by the pressure of the spiral spring 5A, and the webbing 2 is the take-up drum 10 Is wound on.

7 is a perspective view of the disassembled take-up drum unit 4, and the take-up drum 10 and the clutch unit 8 are viewed from the same direction as in FIG. FIG. 8 is a perspective view of the disassembled clutch unit 8, and is an enlarged view of the clutch unit 8 of FIG. 3.

As shown, the winding drum unit 4 is coupled to the winding drum 10 rotatable in the winding direction M and the drawing direction P of the webbing 2 and the lock teeth 26 of the housing 20 It has a movable fouling (4A), a clutch unit (8) and a cap (17). The movable pawl 4A is composed of an engaging claw 4B engaged with the lock tooth 26 and an interlocking pin 4C protruding laterally. When the movable foul 4A is received in the foul receiving portion 14 formed at the end of the take-up drum 10, the interlocking pin 4C is the clutch unit from the guiding portion (through portion) 14A of the foul receiving portion 14. It protrudes toward (8).

9 is a front view of the take-up drum 10 containing the movable foul 4A, and FIG. 10 is a side view of the take-up drum 10 viewed from the direction W3 in FIG. 9. In FIG. 10, the lock teeth 26 of the housing 20 are indicated by dotted lines.

As shown, the movable foul 4A is movably accommodated in the foul receiving portion 14, and moves in the inner and outer directions of the foul receiving portion 14. At that time, the interlocking pin 4C slides the guide portion 14A and moves along the guide portion 14A.

In addition, the movable foul 4A is a non-locking position in which the engaging claw 4B does not engage with the lock tooth 26 (a position shown in Fig. 10A), and a lock in which the engaging claw 4B engages with the locking tooth 26. It moves between positions (positions shown in Fig. 10B). When the movable foul 4A moves to the lock position, the engaging claw 4B engages the lock tooth 26, and movement of the movable foul 4A is prevented. The take-up drum 10 rotating in the take-out direction P is pressed by this movable foul 4A, the take-up drum 10 is locked, and the rotation of the take-out direction P of the take-up drum 10 is stopped. do. Thus, the movable foul 4A forms a part of the lock mechanism 9 together with the clutch unit 8.

The clutch unit 8 (refer to Figs. 7 and 8) includes a circular locking clutch 30, a lock arm 40 displaceably connected to the locking clutch 30, a return spring 8A, and a sensor spring. It has (8B). The locking clutch 30 is a rotating body that rotates together with the take-up drum 10 and is relatively rotatable with respect to the take-up drum 10. The first shaft 12 of the winding drum 10 is inserted into the center hole 31 of the locking clutch 30, and the cap 17 is at the front end of the first shaft 12 protruding from the center hole 31. It is fixed. Thereby, the locking clutch 30 is relatively rotatably connected to the take-up drum 10.

The locking clutch 30 has a spring holder 32 formed on the winding drum 10 side, and the return spring 8A is attached to the spring holder 32. When inserting the first shaft 12 into the center hole 31, with the return spring 8A closed, the return spring 8A and the spring holder 32 are connected to the recess 15 of the take-up drum 10. ) Are placed within. Further, the interlocking pin 4C of the movable foul 4A is inserted into the guide groove 33 of the locking clutch 30, and the cylindrical protrusion 16 (see Fig. 3) of the winding drum 10 is a locking clutch. It is inserted into the through groove 34 of (30). The protrusion 16 is formed on the side of the take-up drum 10 and moves in the through groove 34 in the rotational direction of the take-up drum 10.

The locking clutch 30 (see Figs. 7 and 8) is pressed by the return spring 8A in the pull-out direction P of the webbing 2, and rotates together with the take-up drum 10 in normal times. At that time, the movable foul 4A is held in the non-locked position within the foul receiving portion 14. In an emergency or the like, with the locking clutch 30 locked, the take-up drum 10 rotates with the movable foul 4A in the withdrawal direction P with respect to the stopped locking clutch 30. Along with this, the interlocking pin 4C of the movable foul 4A is urged by the locking clutch 30 to move in the guide groove 33. The interlocking pin 4C is guided by the guide groove 33 and moves outward in the radial direction of the locking clutch 30 along the guide groove 33. By the movement of the interlocking pin 4C, the movable foul 4A moves to the lock position, and the engaging claw 4B of the movable foul 4A engages the lock tooth 26 (see Fig. 10).

When the engaging claw 4B and the lock tooth 26 are engaged, the engaging claw 4B contacts the lock tooth 26 and, with the rotation of the take-out direction P of the take-up drum 10, the engaging claw (4B) moves outward in the radial direction of the locking clutch 30. Thereby, the engaging claw 4B moves along the lock tooth 26 toward the bottom of the lock tooth 26. When the engaging claw 4B reaches the bottom of the lock tooth 26, the engaging claw 4B completely engages with the lock tooth 26, and the movable foul 4A [engagement claw 4B] and the lock tooth ( 26) is completed. The engaging claw 4B and the lock tooth 26 are formed in such a way that they are coupled to each other.

The locking mechanism 9 moves the movable foul 4A as described above while the winding drum 10 rotates by a predetermined amount in the withdrawal direction P, and engages the movable pawl 4A with the lock teeth 26. do. The take-up drum 10 is locked by this lock mechanism 9, and rotation of the take-up direction P of the take-up drum 10 is stopped. After the lock of the locking clutch 30 is released, by pressing the return spring 8A (see Figs. 7 and 8), the locking clutch 30 is relative to the take-up drum 10 in the drawing direction P. Rotates. Along with this, the interlocking pin 4C is urged by the locking clutch 30 to move inside the guide groove 33. The interlocking pin 4C is guided by the guide groove 33 and moves along the guide groove 33 in the radial direction of the locking clutch 30. The movable foul 4A is separated from the lock tooth 26 by the movement of the interlocking pin 4C and returns to the non-locked position. Thereby, the lock of the take-up drum 10 by the lock mechanism 9 is released.

The locking clutch 30 includes a ratchet wheel 36 having a plurality of teeth 35, an arm support 37 for rotatably supporting the lock arm 40, and a support pin for supporting the sensor spring 8B ( 38). The ratchet wheel 36 is made of a ring-shaped member formed on the outer periphery of the locking clutch 30 and is rotatable together with the take-up drum 10. The plurality of teeth 35 are inclined so as to stop rotation of the ratchet wheel 36 only in the drawing direction P, and are formed over the entire outer periphery of the ratchet wheel 36.

The lock arm 40 has a through hole 43 formed between one end (engagement end) 41 and the other end (free end) 42 in the longitudinal direction, and is formed in a curved shape. By inserting the arm support 37 into the through hole 43, the lock arm 40 is installed in the arm support 37 and is rotatably connected to the locking clutch 30. The lock arm 40 is disposed inside the ratchet wheel 36 and rotates around the arm support 37. The sensor spring 8B is disposed between the other end 42 of the lock arm 40 and the support pin 38, and presses the other end 42 in the withdrawal direction P. By this pressurization, the other end 42 of the lock arm 40 comes into contact with the first stopper 39A of the locking clutch 30.

The lock arm 40 is rotatable together with the take-up drum 10 and rotates together with the take-up drum 10 and the locking clutch 30 in the take-up direction P and the take-up direction M. Normally, by the pressure of the sensor spring 8B, the other end 42 of the lock arm 40 is held in contact with the first stopper 39A of the locking clutch 30. On the other hand, when the withdrawal acceleration of the webbing 2 exceeds a predetermined acceleration (that is, the acceleration in the withdrawal direction P of the take-up drum 10 rotating in the withdrawal direction P (acceleration of rotation) is a predetermined acceleration) When exceeds], a delay due to inertia occurs in the lock arm 40 with respect to the rotating locking clutch 30. As a result, the lock arm 40 rotates while compressing the sensor spring 8B, and the one end 41 of the lock arm 40 is displaced radially outward of the locking clutch 30. Along with this, the lock mechanism 9 of the retractor 1 operates as described later.

In this way, the lock arm 40 is a displacement member that can be displaced in the lock operation direction according to the acceleration in the take-out direction P of the take-up drum 10, and is displaced in a predetermined lock operation direction in response to the acceleration. The locking operation direction is a direction for operating the locking mechanism 9, and here is a direction in which one end 41 of the lock arm 40 is displaced radially outward of the locking clutch 30. The lock mechanism 9 is actuated by a lock arm 40 displaced in the lock operation direction. Further, when the lock arm 40 is displaced in the lock operation direction, the lock arm 40 may be displaced, and the lock arm 40 may be displaced relative to the winding drum 10 and the locking clutch 30. . Alternatively, while the lock arm 40 is displaced, it may be relatively displaced with respect to the take-up drum 10 and the locking clutch 30. Therefore, the displacement of the lock arm 40 includes the displacement in each of these forms.

The lock arm 40 is connected to the locking clutch 30 so as to be displaceable in the locking operation direction and rotates together with the locking clutch 30. Further, the arm support 37 is a support for a displacement member, and displaces the lock arm 40 in the lock operation direction by rotation. The lock arm 40 is displaced in both directions by rotating in a direction opposite to the lock operation direction and the lock operation direction. By the pressure of the sensor spring 8B, the lock arm 40 is displaced (rotated) in the opposite direction to the lock operation direction, and the one end 41 of the lock arm 40 is radially inside the locking clutch 30. Is displaced.

The lock mechanism 9 (see Fig. 2) operates by displacement of the lock arm 40 in the lock operation direction, thereby stopping rotation of the take-up drum 10 in the take-out direction P. In addition, the lock mechanism 9 operates by stopping the rotation of the take-out direction P of the ratchet wheel 36, and stops the rotation of the take-out direction P of the take-up drum 10.

Specifically, the retractor 1 stops the rotation of the ratchet wheel 36 and a means for stopping the lock arm 40 displaced in the lock operation direction in the mechanism cover unit 6 (lock arm stopping means). It is provided with means (ratchet wheel stop means). With the stop of the lock arm 40 or the stop of rotation of the ratchet wheel 36, the locking clutch 30 is stopped. In that state, with the rotation of the take-up direction P of the take-up drum 10, the movable foul 4A of the lock mechanism 9 moves to the lock position, and the take-up drum 10 is locked. Hereinafter, the mechanism cover unit 6 having each stop means will be described in detail.

The mechanism cover unit 6 (refer to FIGS. 3 and 4) includes an acceleration sensor 50 for detecting acceleration of the vehicle, a mechanism cover 6A for accommodating the clutch unit 8, and the displacement of the lock arm 40. It has a regulating member 56 that regulates the retractor and switching means 60 for switching the state of the retractor 1. The acceleration sensor 50 is a ratchet wheel stop means, and is an emergency lock starting device that activates the lock mechanism 9 when the vehicle is in an emergency. Further, the acceleration sensor 50 has a sensor holder 51, an inertial mass 52, and a sensor lever 53. The inertial mass 52 is made of a metal sphere, and is disposed to be movable in the recess of the sensor holder 51. The sensor lever 53 covers the inertial mass 52 from above and is installed on the sensor holder 51 so as to be movable in the vertical direction.

11 is a perspective view of the acceleration sensor 50, the mechanism cover 6A, and the regulating member 56. As shown in FIG.

As shown, the mechanism cover 6A includes a cylindrical clutch accommodating portion 6B accommodating the locking clutch 30, a sensor accommodating portion 6C accommodating the acceleration sensor 50, and a sensor accommodating portion ( It has a sensor cover 6D covering the acceleration sensor 50 in 6C). With the acceleration sensor 50 installed in the sensor accommodating part 6C, the lock claw 54 of the sensor lever 53 protrudes upward, and is arrange|positioned in the opening 6E of the clutch accommodating part 6B.

12 is a cross-sectional view of the mechanism cover unit 6 viewed from the direction W4 in FIG. 11, and also shows the locking clutch 30 accommodated in the clutch accommodation portion 6B.

As shown, the inertial mass 52 is movably held between the sensor holder 51 and the sensor lever 53. When the acceleration of the vehicle exceeds a predetermined acceleration due to an emergency (for example, a collision or sudden brake) of the vehicle, the inertial mass 52 moves on the sensor holder 51 by inertial force, and the sensor lever ( 53) upwards. Thereby, the lock claw 54 of the sensor lever 53 moves into the clutch accommodating part 6B, and meshes with the teeth 35 of the ratchet wheel 36.

The teeth 35 of the ratchet wheel 36 engage with the lock claw 54 of the sensor lever 53 only when the ratchet wheel 36 rotates in the drawing direction P. The ratchet wheel 36 (locking clutch 30) is locked by the lock claw 54, so that rotation of the ratchet wheel 36 in the withdrawal direction P is stopped. Along with this, the locking mechanism 9 operates and locks the take-up drum 10 by the movable foul 4A. The rotation of the take-up drum 10 in the take-out direction P is stopped by the lock mechanism 9 and the take-out of the webbing 2 is stopped. Accordingly, the acceleration sensor 50 and the lock mechanism 9 constitute a vehicle body sensitive locking mechanism that stops the withdrawal of the webbing 2 in response to a sudden change in the vehicle speed.

When the acceleration of the vehicle becomes less than or equal to the predetermined acceleration, the inertial mass 52 moves to the original position by gravity. After that, the take-up drum 10 is released from the load of the webbing 2, and it becomes rotatable in the take-up direction M. When the winding drum 10 and the locking clutch 30 rotate in the winding direction M, the locking claw 54 is removed from the teeth 35 of the ratchet wheel 36 and moves out of the clutch receiving portion 6B. . At the same time, the lock of the ratchet wheel 36 (locking clutch 30) is released. Further, the lock of the take-up drum 10 by the lock mechanism 9 is released, and the webbing 2 can be pulled out and wound up.

The mechanism cover 6A (see Fig. 11) includes a ring-shaped wall 6F formed in the clutch accommodating portion 6B, a stop 6G formed on the inner periphery of the ring-shaped wall 6F, and a ring-shaped wall 6F. It has a central support portion 6H located at the center of the slit and an insertion hole 6I penetrating the central support portion 6H. The cap 17 (see Fig. 7) fixed to the first shaft 12 is inserted into the insertion hole 6I, so that the first shaft 12 of the take-up shaft 10 can be rotated by the center support 6H. Is supported. In that state, the locking clutch 30, the ratchet wheel 36, and the lock arm 40 are accommodated in the clutch receiving portion 6B (see Figs. 11 and 12). Further, the ratchet wheel 36 is disposed between the inner periphery of the clutch accommodating portion 6B and the outer periphery of the ring-shaped wall 6F, and the lock arm 40 is disposed inside the ring-shaped wall 6F.

The central support portion 6H is also a support portion for a regulating member that rotatably supports the regulating member 56, and is made of a ring-shaped convex portion protruding into the clutch accommodation portion 6B. The regulating member 56 has a pressing portion 57 for pressing the lock arm 40 and an installation portion 58 provided on the center supporting portion 6H. In this embodiment, by bending the wire, the regulating member 56 is formed in a predetermined shape, and the mounting portion 58 is a clip that is sandwiched between the center support portion 6H. When the regulating member 56 rotates, friction (friction force) is generated between the installation portion 58 and the center support portion 6H, and resistance against rotation is applied to the regulating member 56.

The pressing portion 57 of the regulating member 56 has a linear shape and is disposed radially outward of the locking clutch 30 from the center support portion 6H (installation portion 58). The distal end of the pressing portion 57 is bent toward the lock arm 40, and the lock arm 40 contacts the bent portion (contact portion 59) of the pressing portion 57. The regulating member 56 is adjacent to the lock arm 40 from the inside of the ring-shaped wall 6F, and rotates in the winding direction M and the drawing direction P around the center support 6H. During normal rotation of the take-up drum 10, the regulating member 56 rotates in conjunction with the rotation of the locking clutch 30 and the lock arm 40.

The stopping part 6G is a lock arm stopping means, and has a plurality of engaging teeth 6J formed over the entire inner circumference of the ring-shaped wall 6F. The engagement tooth 6J is an engagement portion of the stop portion 6G that engages with the lock arm 40 displaced in the lock operation direction, and engages with the one end portion 41 of the lock arm 40. Further, the plurality of engagement teeth 6J protrude toward the lock arm 40 and tilt so as to stop rotation of only the withdrawal direction P of the lock arm 40 and the locking clutch 30. Only when the locking clutch 30 rotates in the withdrawal direction P, the one end 41 of the lock arm 40 is engaged by engaging the engaging teeth 6J of the stop 6G.

13 is a diagram showing the operation of the lock arm 40 when the webbing 2 is withdrawn, and shows a part of the stop portion 6G and the clutch unit 8. 13A, the lock operation direction L of the lock arm 40 is indicated by an arrow. When the lock arm 40 is displaced in the lock operation direction L by rotation, the one end 41 of the lock arm 40 is displaced toward the stop 6G, and the other end of the lock arm 40 42 is displaced toward the pressing portion 57 of the regulating member 56.

During normal withdrawal of the webbing 2 (see Fig. 13A), the locking clutch 30 and the lock arm 40 integrally rotate in the withdrawal direction P together with the take-up drum 10. At that time, the one end 41 of the lock arm 40 is disposed at a position spaced apart from the stop 6G (engaging teeth 6J), and the lock arm 40 is not engaged with the stop 6G Is maintained.

The pressing portion 57 of the regulating member 56 is separated from the other end 42 of the lock arm 40 by rotation of the take-up direction P of the take-up drum 10, and the second It contacts the stopper 39B. The pressing portion 57 is urged in the pull-out direction P by the second stopper 39B, and the regulating member 56 rotates together with the locking clutch 30 in the pull-out direction P. In addition, the pressing portion 57 is separated from the lock arm 40 (displacement of the lock arm 40 in the lock operation direction L) during rotation of the take-up direction P of the take-up drum 10. Unregulated state] to allow displacement of the lock arm 40 in the lock operation direction L.

When the acceleration in the take-out direction P of the take-up drum 10 exceeds a predetermined acceleration due to the rapid withdrawal of the webbing 2, the lock arm 40 is in the take-out direction P of the take-up drum 10. It is displaced in the lock operation direction L according to the acceleration (see Fig. 13B). Along with this, the lock arm 40 is displaced by rotation and comes into contact with the third stopper 39C of the locking clutch 30. Further, the one end 41 of the lock arm 40 approaches the stop 6G and engages with the engaging teeth 6J. The stop portion 6G engages the lock arm 40 displaced in the lock operation direction L, and stops the lock arm 40.

By engaging the lock arm 40 to the stop 6G (engaging tooth 6J), the stop 6G holds the lock arm 40 displaced in the lock operation direction L, and the take-up drum ( The rotation of the locking arm 40 and the locking clutch 30 rotating together with 10) is stopped. Further, the lock arm 40 is maintained in a stopped state at the stop portion 6G, and in that state, the lock mechanism 9 is operated with the rotation of the take-out direction P of the take-up drum 10. Start.

Specifically, the locking clutch 30 is locked by the lock arm 40, and rotation of the locking clutch 30 in the withdrawal direction P is stopped. Along with this, the locking mechanism 9 operates and locks the take-up drum 10 by the movable foul 4A. The locking mechanism 9 stops the rotation of the take-up drum 10 in the take-out direction P, and the take-out of the webbing 2 is stopped. Accordingly, the stop portion 6G of the lock arm 40 constitutes a part of the lock mechanism 9. Further, the stop portion 6G and the locking mechanism 9 constitute a webbing-sensitive locking mechanism that stops the pull-out of the webbing 2 in response to the rapid pull-out of the webbing 2.

When the one end 41 of the lock arm 40 is removed from the engagement tooth 6J, the lock of the locking clutch 30 is released. The lock arm 40 is released from the stop 6G and is displaced in a direction opposite to the lock operation direction L. Thereafter, the take-up drum 10 is released from the load of the webbing 2 and rotates in the take-up direction M along the take-up of the webbing 2. Along with this, the locking clutch 30 rotates relative to the take-up drum 10 in the drawing direction P, and the lock of the take-up drum 10 by the locking mechanism 9 is released. Thereafter, the webbing 2 can be pulled out and wound up.

14 is a diagram showing the operation of the lock arm 40 when the webbing 2 is wound up, and shows a part of the stop portion 6G and the clutch unit 8.

During normal winding of the webbing 2 (see Fig. 14A), together with the winding drum 10, the locking clutch 30 and the lock arm 40 rotate integrally in the winding direction M. At that time, the pressing portion 57 of the restricting member 56 contacts the other end 42 of the lock arm 40 and is pressed by the other end 42 in the winding direction M. Thereby, the regulating member 56 rotates together with the lock arm 40 in the winding direction M.

Here, with the end of winding of the webbing 2 (refer to Fig. 14B), there is a possibility that the locking mechanism 9 may erroneously operate due to the reaction of stopping the rotation of the winding drum 10. That is, with respect to the locking clutch 30 that has stopped rotating, the lock arm 40 is displaced by the inertial force in the locking operation direction L (here, the winding direction M), and the locking mechanism 9 operates. When the lock mechanism 9 operates, rotation of the take-up direction P of the take-up drum 10 is stopped, and the webbing 2 cannot be taken out of the take-up drum 10. At the same time, since the entire webbing 2 is wound up, the webbing 2 cannot be wound up, and an end lock occurs in the retractor 1. On the other hand, in this embodiment, the regulating member 56 regulates the displacement of the lock arm 40 in the lock operation direction L due to the recoil of the rotation stop in the winding direction M of the winding drum 10, It prevents the operation of the locking mechanism 9.

15 is a diagram showing a regulating member 56 that regulates the displacement of the lock arm 40. Fig. 15A is an enlarged view of a part of Fig. 14B, and Fig. 15B is an enlarged view of part Y1 of Fig. 15A.

As described above, the pressing portion 57 (contact portion 59) of the regulating member 56 is spaced apart from the lock arm 40 when the take-up drum 10 rotates in the take-out direction P. When the winding drum 10 rotates in the winding direction M, as shown, the pressing portion 57 contacts the lock arm 40 and displaces the lock arm 40 in the locking operation direction L. Pressure. That is, the pressing portion 57 contacts the other end 42 of the lock arm 40 by rotation in the winding direction M of the winding drum 10, and is in the winding direction M of the winding drum 10. During rotation, it is kept in contact with the lock arm 40. Further, the pressing portion 57 suppresses the lock arm 40 which is displaced in the lock operation direction L due to the recoil of the rotation stop of the winding drum 10 in the winding direction M.

The lock arm 40 has an engaging portion 44 that engages with the pressing portion 57 of the regulating member 56 upon displacement in the lock operating direction L. The coupling portion 44 is made of a convex portion formed on the other end portion 42 of the lock arm 40 and protrudes toward the lock operation direction L. When the winding drum 10 rotates in the winding direction M, first, the pressing portion 57 of the regulating member 56 is at a position spaced apart from the engaging portion 44 of the lock arm 40 (sliding portion 45 )]. The sliding portion 45 of the lock arm 40 is a portion proximate to the engaging portion 44 of the lock arm 40. The pressing portion 57 slides the sliding portion 45 to be close to the engaging portion 44 or separated from the engaging portion 44. In that state, the engaging portion 44 is not coupled to the pressing portion 57, and the restricting member 56 rotates in the winding direction (M) together with the lock arm 40 while sliding the sliding portion 45. do.

When the displacement of the lock arm 40 in the locking operation direction L starts, the pressing portion 57 and the engaging portion 44 approach, and the engaging portion 44 engages the pressing portion 57. At that time, the pressing portion 57 slides the sliding portion 45 made of a flat or curved surface toward the engaging portion 44 to contact the engaging portion 44. Further, the engaging portion 44 made of the convex portion is caught by contacting the contact portion 59 of the pressing portion 57, or stops the movement of the pressing portion 57, and is engaged with the pressing portion 57. The engaging portion 44 restrains the pressing portion 57 of the regulating member 56 and prevents movement (including sliding and rotation) of the pressing portion 57. The movement of the pressing portion 57 is prevented by the engaging portion 44 and the restricting member 56 is stopped.

A state in which the lock arm 40 is urged by the engaging portion 44 of the lock arm 40 by the restricting member 56 by the pressing portion 57 to regulate the displacement of the lock arm 40 (regulated state) Is maintained. Further, the pressing portion 57 is held in a state of pressing the lock arm 40 by engaging with the engaging portion 44, thereby stopping the displacement of the lock arm 40 in the locking operation direction L. The regulating member 56 presses the engaging portion 44 displaced together with the lock arm 40 by the pressing portion 57, and regulates the displacement of the lock arm 40 in the lock operation direction L.

In the present embodiment, the engaging portion 44 of the lock arm 40 has an engaging surface 46 that contacts the pressing portion 57 of the restricting member 56, and the pressing portion 57 at the engaging surface 46 Binds to The coupling surface 46 is made of a flat surface or a curved surface, and is formed so as not to apply a force in the direction of moving the pressing portion 57 to the pressing portion 57. Further, the rotation center N1 of the regulation member 56 is arranged at a position different from the rotation center N2 of the lock arm 40 by the center support portion 6H serving as the support portion for the regulation member. In addition, the rotation radius R2 of the engaging portion 44 is set larger than the rotation radius R1 of the pressing portion 57. The rotation radius R2 of the engagement portion 44 is the distance from the rotation center N2 of the lock arm 40 to the contact point between the engagement portion 44 and the pressing portion 57, and the rotation radius R1 of the pressing portion 57, It is the distance from the rotation center N1 of the regulation member 56 to the contact point of the engaging part 44 and the pressing part 57.

The displacement direction (rotation trajectory) S2 due to the rotation of the engaging portion 44 is set in a direction intersecting with the rotational direction (rotation trajectory) S1 of the pressing portion 57 (contact portion 59). As a result, with the start of displacement of the lock arm 40 in the lock operation direction L, the engagement portion 44 presses the pressing portion 57 of the regulating member 56 together with the lock arm 40. It is displaced in the direction and is coupled to the pressing portion 57 located in front of the displacement direction S2. Subsequently, the engaging portion 44 is pressed against the pressing portion 57, and a force in the direction of preventing the movement of the pressing portion 57 is applied to the pressing portion 57. At the contact point between the engaging portion 44 and the pressing portion 57, the normal line T of the engaging surface 46 passes through the rotation center N1 of the regulating member 56. Therefore, by the engaging portion 44, the pressing portion 57 is pressed against the center support portion 6H, so that only the force directed toward the rotation center N1 is applied to the pressing portion 57.

The movement of the pressing portion 57 is prevented by the force applied from the engaging portion 44, so that the regulating member 56 is held in a regulated state. Further, the operation of the lock mechanism 9 due to the displacement of the lock arm 40 is prevented, and the occurrence of the end lock in the retractor 1 is suppressed. When the inertial force that displaces the lock arm 40 in the lock operation direction L stops acting on the lock arm 40, the coupling portion 44 moves in the displacement direction S2 by the pressure of the sensor spring 8B. It is displaced in the opposite direction of and is smoothly spaced from the pressing part 57. Thereby, the engagement between the engaging portion 44 and the pressing portion 57 is released.

In addition, with respect to the lock arm 40 and the restricting member 56, the surface of the pressing portion 57 in contact with the engaging portion 44 may be formed in a curved surface, or may be formed in a shape having a flat surface or a corner portion. The pressing portion 57 may be in contact with the engaging portion 44 in a line, or may contact the engaging portion 44 in points or surfaces. The engagement portion 44 may be formed so that the normal line T of the engagement surface 46 is shifted from the rotation center N1 of the regulating member 56. For example, by shifting the normal line (T) of the engagement surface 46 toward the rotation center N2 of the lock arm 40, the force on the opposite side of the rotation direction S1 from the engagement portion 44 to the pressing portion 57 Applied. Further, a portion (such as a hook-shaped portion) that interferes with the rotation of the pressing portion 57 may be formed in the engaging portion 44. In this way, while the engaging portion 44 more reliably restrains the pressing portion 57, the restricting member 56 is stably maintained in a state where the lock arm 40 is pressed by the pressing portion 57. .

On the other hand, by the static friction force between the pressing portion 57 and the engaging portion 44, the pressing portion 57 is held by the engaging portion 44, so that the engaging portion 44 is coupled to the pressing portion 57. You can do it. When the coefficient of static friction between the coupling portion 44 and the pressing portion 57 is µ, the friction angle θ is calculated from the relational expression µ and θ (μ=tanθ). Further, the contact point between the engaging portion 44 and the pressing portion 57 is connected to the rotation center N1 of the regulating member 56, and a virtual line is drawn between the contact point and the rotation center N1. When the angle (normal angle) formed by this imaginary line and the normal line T of the engagement surface 46 is less than or equal to the friction angle θ, the pressing portion 57 is held by the engagement portion 44 by the static friction force.

For example, when the coefficient of static friction mu between the coupling portion 44 (polyacetal resin) and the pressing portion 57 (stainless steel) is 0.15, the friction angle θ is about 8.5 degrees. Therefore, when the normal angle is 8.5 degrees or less, the coupling portion 44 is maintained in a state of being engaged with the pressing portion 57 regardless of the direction of the normal T of the coupling surface 46. In this case, the normal line T may be shifted from the rotation center N1 of the restricting member 56 toward the rotation direction S1 of the pressing portion 57. Further, the direction of the normal T may be changed so as to satisfy the condition that the normal angle is equal to or less than the friction angle θ. As long as the normal angle satisfies the condition of the friction angle θ or less, an error may occur in the normal angle.

Here, even if the displacement of the lock arm 40 is regulated by the regulating member 56, depending on the speed in the winding direction M of the winding drum 10 or the stopping method of the webbing 2, the locking mechanism 9 There is a possibility that end lock may occur in the retractor 1 by operating. When the end lock occurs (see Fig. 13), the one end 41 of the lock arm 40 engages with the engagement teeth 6J of the stop portion 6G, so that the lock arm 40 becomes the stop portion 6G. Binds to

On the other hand, the retractor 1 of this embodiment (see Fig. 3) is a release means 18 for releasing the engagement of the lock arm 40 and the stop 6G while the lock mechanism 9 is operating. It is equipped with. For example, even if an end lock occurs in the retractor 1, the engagement of the lock arm 40 and the stop portion 6G is released by the release means 18 to release the end lock of the retractor 1 do. The releasing means 18 has a protrusion 16 formed in the winding drum 10 and a through groove 34 formed in the locking clutch 30. The protrusion 16 protrudes from the take-up drum 10 toward the lock arm 40, and moves in the through groove 34 in the rotational direction of the take-up drum 10. Further, the protrusion 16 passes through the through groove 34 and contacts the lock arm 40.

16 and 17 are diagrams showing the operation of the retractor 1 during end lock, and the main parts of the retractor 1 are shown in the same manner as in FIG. 12. 16 and 17 show a section of the lock arm 40 while showing a part of the stopper 6G and the clutch unit 8. By seeing a part of the locking clutch 30, a part of the movable foul 4A and the lock tooth 26 are also shown in FIGS. 16 and 17.

As shown, the protrusion 16 is disposed in the concave portion 47 formed in the lock arm 40, moves within the concave portion 47, and contacts the lock arm 40. As shown in FIG.

At the time of end lock (refer to Figs. 16A and 16B), the lock arm 40 is displaced in the lock operation direction L, and the stop 6G engages with the lock arm 40 to stop the lock arm 40. Let it. By this lock arm 40, the locking clutch 30 is locked and stopped. In that state, by pulling out the webbing 2 from the retractor 1, the take-up drum 10 rotates in the pull-out direction P. Further, with the rotation of the take-up drum 10 in the take-out direction P, the operation of the lock mechanism 9 starts, and the lock mechanism 9 stops the rotation of the take-up drum 10. At that time, as the take-up drum 10 rotates relatively with respect to the locking clutch 30, the protrusion 16 moves in the withdrawal direction P and contacts the lock arm 40 (see Fig. 16C). Accordingly, the protrusion 16 is a contact member that moves with the rotation of the take-up direction P of the take-up drum 10 and contacts the lock arm 40.

While the take-up drum 10 rotates in the drawing direction P, the protrusion 16 urges the portion on the one end 41 side of the lock arm 40 in the drawing direction P (see Fig. 16D). Accordingly, the protrusion 16 is also a rotation transmission member that directly presses the lock arm 40 to transmit the rotation of the take-up direction P of the take-up drum 10 to the lock arm 40. The release means 18 has a transmission mechanism 19 that transmits the rotation of the take-up drum 10 to the lock arm 40 by means of a projection 16. By the transmission mechanism 19, the lock arm 40 is removed from the stop 6G, and the end lock of the retractor 1 is released.

Specifically, from the start of operation of the lock mechanism 9 until the rotation of the take-up direction P of the take-up drum 10 by the lock mechanism 9 is completely stopped, the transfer mechanism 19 is The rotation (rotation force) of the withdrawal direction P of (10) is transmitted to the lock arm 40. As described above, this transmission mechanism 19 has a rotation transmission member made of a projection 16. The protrusion 16 contacts the lock arm 40 with the rotation of the take-up direction P of the take-up drum 10 and presses the lock arm 40. Subsequently, the transmission mechanism 19 (protrusion 16) applies a force to the lock arm 40 to displace the lock arm 40 in the direction (release direction) to release the engagement with the stop portion 6G. By the transmission mechanism 19 of the release means 18, the lock arm 40 is removed from the stop 6G, and the engagement of the lock arm 40 and the stop 6G is released (see Fig. 17A). .

While the movable foul 4A moves from the non-locked position to the locked position, the releasing means 18 releases the engagement of the lock arm 40 and the stop 6G. At that time, with the rotation of the take-out direction P of the take-up drum 10, the engagement of the lock arm 40 and the stop portion 6G is released in a state in which the movable foul 4A is engaged with the lock tooth 26. do. Here, in a state in which the engaging claw 4B of the movable pawl 4A contacts the lock tooth 26, the engagement between the lock arm 40 and the stop portion 6G is released. Subsequently, with the rotation of the take-up direction P of the take-up drum 10, the engaging claw 4B moves along the lock tooth 26 to reach the bottom of the lock tooth 26, and the movable foul 4A ) And the lock teeth 26 are combined.

On the other hand, with the rotation of the take-out direction P of the take-up drum 10, in a state in which the engaging claw 4B can contact the lock tooth 26, the engagement of the lock arm 40 and the stop portion 6G is It may be turned off. In this case, the engagement of the lock arm 40 and the stop portion 6G is released in a state in which the engagement claw 4B does not contact the lock teeth 26. Subsequently, by pressing of the return spring 8A, the locking clutch 30 rotates relative to the take-up drum 10 in the withdrawal direction P, and the movable foul 4A moves toward the non-locked position. . However, the engaging claw 4B is at a position capable of contacting the lock tooth 26 and contacts the lock tooth 26 with the rotation of the take-up direction P of the take-up drum 10. After that, with the rotation of the take-up drum 10 in the take-out direction P, the engagement of the movable foul 4A and the lock tooth 26 is completed.

18 is a diagram showing a process in which the lock arm 40 and the stop portion 6G are disengaged, and the lock arm 40 and the stop portion 6G are enlarged.

As shown, the releasing means 18 urges the lock arm 40 by the transmission mechanism 19 and displaces the lock arm 40 in the releasing direction while moving along the stop portion 6G. At that time, first, the protrusion 16 of the transmission mechanism 19 urges the one end 41 of the lock arm 40 toward the engagement tooth 6J of the stop portion 6G (arrow Q1). Along with this, the one end 41 of the lock arm 40 begins to move along the engagement surface of the engagement tooth 6J, and moves toward the tip end of the engagement tooth 6J (arrow Q2).

In conjunction with the movement of the one end 41 of the lock arm 40, the lock arm 40 rotates about the arm support 37, and the arm support 37 of the lock arm 40 moves. (Arrow Q3). Further, after the arm support 37 starts to move, the locking clutch 30 is urged by the arm support 37 in the winding direction M. As a result, while the lock arm 40 rotates together with the locking clutch 30 in the winding direction M, the one end 41 of the lock arm 40 moves toward the distal end of the engagement tooth 6J. At the same time, the lock arm 40 rotates around the center of rotation N2 (arm support 37) in the opposite direction (release direction) of the lock operation direction L, and the entire lock arm 40 becomes the engaging teeth 6J It displaces in the direction away from.

Upon displacement of the lock arm 40, the protrusion 16 of the transmission mechanism 19 contacts the contact surface (contact portion) 47A of the lock arm 40 within the concave portion 47 of the lock arm 40. do. The concave portion 47 is formed on the winding drum 10 side of the lock arm 40, and the contact surface 47A is made of a smooth inner surface of the concave portion 47. The protrusion 16 slides along the contact surface 47A within the concave portion 47 and smoothly moves toward the one end portion 41 of the lock arm 40. With this movement, the protrusion 16 presses the one end 41 of the lock arm 40 toward the engaging teeth 6J of the stop 6G without obstructing the movement of the lock arm 40 do. The lock arm 40 and the locking clutch 30 rotate by the engagement teeth 6J of the protrusion 16 and the stop 6G, and the lock arm 40 is displaced.

The release means 18 is a direction in which the lock arm 40 is separated from the stop 6G together with the locking clutch 30 by the force received by the lock arm 40 from the stop 6G (here, the winding direction ( M)], displace the lock arm 40 in the release direction. At that time, the lock arm 40 moves toward the distal end of the engagement teeth 6J in a state engaged with the engagement teeth 6J. The engaging teeth 6J apply force to the lock arm 40 while moving the lock arm 40 displaced in the release direction, thereby rotating the lock arm 40 and the locking clutch 30. Further, the lock arm 40 rotates around the rotation center N2 with the movement according to the engagement tooth 6J. In this way, the engagement tooth 6J rotates while moving the lock arm 40 displaced in the release direction toward the distal end in the state engaged with the lock arm 40, and to the lock arm 40, the locking clutch 30 ) And apply a rotating force.

When the displacement of the lock arm 40 causes the one end 41 of the lock arm 40 to be removed from the engaging teeth 6J of the stop 6G, the lock arm 40 and the stop 6G The engagement is released, and the lock arm 40 is released from the stop 6G. In connection with this, the lock arm 40 is displaced in the direction opposite to the lock operation direction L and returns to its original position (see Figs. 17A and 17B). In addition, the locking clutch 30 is unlocked. The lock mechanism 9 stops the rotation of the take-up direction P of the take-up drum 10 after the lock arm 40 and the stop portion 6G are disengaged. Accordingly, the releasing means 18 releases the engagement of the lock arm 40 and the stop portion 6G in a state in which the lock mechanism 9 operates in accordance with the rotation of the take-out direction P of the take-up drum 10. do.

Thereafter, by winding up the webbing 2, the take-up drum 10 rotates in the take-up direction M, and the locking clutch 30 rotates relative to the take-up drum 10 in the take-out direction P ( 17C). Since the locking of the locking clutch 30 is released before the webbing 2 is wound, the rotation of the withdrawal direction P of the locking clutch 30 is early after the winding drum 10 rotates in the winding direction M. It is disclosed in Further, the interlocking pin 4C of the movable pawl 4A is guided by the guide groove 33, so that the engaging claw 4B of the movable pawl 4A is moved to the position where it is removed from the lock tooth 26. When the movable foul 4A moves in this way, the locking clutch 30 rapidly rotates relatively in the withdrawal direction P, and the movable foul 4A moves to the non-locked position (see Fig. 17D). Along with this, the lock of the take-up drum 10 by the lock mechanism 9 is released, and then the webbing 2 can be pulled out and wound up.

In addition, at the same time as the generation of the end lock, the acceleration sensor 50 is operated by vibration of the vehicle, so that the lock claw 54 of the sensor lever 53 may be meshed with the teeth 35 of the ratchet wheel 36. have. In this case, the locking claw 54 may be removed from the teeth 35 by using the rotation of the locking clutch 30 in the winding direction M by the releasing means 18. Thereby, the stop of the ratchet wheel 36 by the acceleration sensor 50 is released.

Regarding the release means 18 and the transmission mechanism 19, the protrusion 16 of the take-up drum 10 may be brought into contact with the outer surface of the lock arm 40 to press the lock arm 40. The rotation of the take-up drum 10 may be transmitted to the lock arm 40 by bringing the protrusion (rotation transmission member) formed on the lock arm 40 into contact with the side surface of the take-up drum 10. The rotation of the take-up drum 10 may not be transmitted directly to the lock arm 40, but may be transmitted indirectly to the lock arm 40 via a rotation transmission member.

Further, the interlocking pin 4C of the movable pawl 4A may be used as the rotation transmission member. In this case, for example, the other end 42 of the lock arm 40 is partially formed toward the guide groove 33, and the interlocking pin 4C is directed toward the other end 42 of the lock arm 40. To form. In this way, the other end 42 of the lock arm 40 and the interlocking pin 4C are formed in a contactable shape, and by the interlocking pin 4C moving in the guide groove 33, the lock arm 40 The other end 42 of the is pressed. Thereby, the rotation of the take-up drum 10 is transmitted to the lock arm 40, and the lock arm 40 is displaced in the release direction.

At the same time as the displacement of the lock arm 40 by the transmission mechanism 19, the locking clutch 30 is wound in the winding direction M by the interlocking pin 4C of the movable foul 4A moving in the guide groove 33. ), you may want to press. In this case, when the engaging claw 4B moves along the lock tooth 26 and reaches the bottom of the lock tooth 26, the interlocking pin 4C moves in the guide groove 33 while the locking clutch 30 ) Is pressed in the winding direction (M). Further, by rotating the locking clutch 30 in the winding direction M, the locking arm 40 is displaced in a direction away from the stop 6G. As a result, disengagement of the lock arm 40 and the stop portion 6G is assisted. When there is a rattle in the lock arm 40 or the locking clutch 30, the lock arm 40 is also displaced in the release direction by the rattle.

Next, the switching means 60 for switching the state of the retractor 1 will be described (see Figs. 3 and 4). By the switching means 60, the state of the retractor 1 is switched to the automatic lock state ALR and the emergency lock state ELR in response to the purpose of use. In the automatic locking state, the webbing 2 cannot be pulled out, and only the webbing 2 can be wound. For example, when a child seat or luggage is fixed to the seat, the retractor 1 is automatically switched to the locked state. On the other hand, in the emergency lock state, the webbing 2 can be wound up and taken out. However, when the vehicle is in an emergency, the take-up drum 10 is locked by the locking mechanism 9. As a result, the rotation of the take-up direction P of the take-up drum 10 is stopped, and the take-out of the webbing 2 is stopped.

The switching means 60 moves the operation member 61 for operating the lock mechanism 9, the arm-shaped arrangement member 62 for placing the operation member 61 at a predetermined position, and the arrangement member 62 A disk-shaped moving member 70, a first pressing means 63 that is a pressing means for an arrangement member, a second pressing means 64 that is a pressing means for an operation member, and a deceleration mechanism 80 are provided. Further, the reduction mechanism 80 has a drive gear 81, an intermediate gear 82 and a driven gear 83, and moves with the winding drum 10 by a plurality of gears 81, 82, 83 combined. It is connected to the member 70.

The operation member 61 and the placement member 62 are rotatably installed on a cylindrical rotation shaft (rotation shaft) 6K formed in the mechanism cover 6A (see Fig. 3). The first pressing means 63 is made of an elastically deformable pressing member (spring, rubber, elastic member, etc.) (here, a tension coil spring), and is provided on the placement member 62 and the mechanism cover 6A. The second pressing means 64 is made of an elastically deformable pressing member (spring, rubber, elastic member, etc.) (here, a torsion spring), and is provided on the operation member 61 and the mechanism cover 6A. The center hole 71 of the moving member 70 is rotatably provided in the ring-shaped support part 6L of the mechanism cover 6A, and the moving member 70 rotates about the ring-shaped support part 6L.

The cap 17 fixed to the 1st shaft 12 is inserted into the insertion hole 6I, and is arrange|positioned in the ring-shaped support part 6L. The drive gear 81 is fixed to the cap 17 in the ring-shaped support 6L, and is integrated with the first shaft 12 and the cap 17 of the winding drum 10 at the center of the moving member 70 Rotate with The driven gear 83 is an internal gear formed in the inner convex portion 72 of the moving member 70, and is a gear larger than the drive gear 81 and the intermediate gear 82. The intermediate gear 82 has a first gear 82A larger than the drive gear 81 and a second gear 82B smaller than the first gear 82A (see Fig. 4), and the outer cover 6V It is installed to be rotatable. The first gear 82A meshes with the drive gear 81, and the second gear 82B meshes with the driven gear 83. The outer cover 6V is provided on the mechanism cover 6A, and covers the switching means 60.

Fig. 19 is a side view of the retractor 1 viewed from the direction W5 in Fig. 4, and shows the mechanism cover unit 6 with the outer cover 6V removed. Further, Fig. 19 also shows the ratchet wheel 36 of the locking clutch 30 accommodated in the mechanism cover 6A (clutch accommodating portion 6B). The ratchet wheel 36 is exposed in the opening 6M of the clutch accommodating part 6B. In addition, in FIG. 19, a part of the operation member 61 and a part of the arrangement member 62 that have moved from the position indicated by the solid line are shown by dotted lines.

As shown, when the winding drum 10 rotates, the drive gear 81 rotates integrally with the cap 17. Due to the rotation of the drive gear 81, the first gear 82A rotates, and the intermediate gear 82 rotates at a rotation speed slower than the rotation speed of the drive gear 81. By the rotation of the second gear 82B of the intermediate gear 82, the driven gear 83 rotates at a rotational speed slower than the rotational speed of the intermediate gear 82, and the moving member 70 rotates the winding drum 10 It rotates in conjunction with the rotation of. The deceleration mechanism 80 decelerates the rotation of the take-up drum 10 and transmits it to the moving member 70, and rotates the moving member 70 at a rotational speed slower than the rotational speed of the take-up drum 10. Here, while the entire webbing 2 is pulled out, the moving member 70 rotates by a predetermined angle of 360° or less. Further, the moving member 70 rotates in a direction opposite to the rotational direction of the take-up drum 10.

The operation member 61 and the placement member 62 are rotatably installed on one rotation shaft 6K so as to overlap in the axial direction of the rotation shaft 6K, and are combined so as to be rotatable together. In that state, the operation member 61 is disposed on the ratchet wheel 36 side with respect to the moving member 70, and the placement member 62 is along the surface of the inner convex portion 72 side of the moving member 70. Is placed. The movable member 70 is a cam member that moves the placement member 62 by rotation, and is a control member that controls the position of the operation member 61 by the placement member 62.

The placement member 62 is a cam follower that is driven by the moving member 70 and is a switching lever for switching the state of the retractor 1. The actuating member 61 is an interlocking member that interlocks with the placement member 62, and is an actuating switch (switching switch) that switches the operation and non-operation of the lock mechanism 9. The lock mechanism 9 is operated by the operation member 61 to stop only the rotation of the take-up direction P of the take-up drum 10, and allow the take-up drum 10 to rotate in the take-up direction M. Here, the actuating member 61 is an engaging member that meshes with the teeth 35 of the ratchet wheel 36 within the mechanism cover 6A, and the drawing direction of the ratchet wheel 36 by meshing with the teeth 35 Stop the rotation of (P). The lock mechanism 9 operates with the rotation of the ratchet wheel 36 in the withdrawal direction P due to the engagement of the operation member 61 and the teeth 35. Thus, the switching means 60 with the actuating member 61 is also a ratchet wheel stop means.

The operation member 61 and the placement member 62 rotate around the rotation shaft 6K and move in the same rotation direction. That is, the retractor 1 is provided with a rotation means 65 for rotating the operation member 61 and the placement member 62 by rotation, and the rotation means 65 has one rotation shaft 6K. The placement member 62 is rotated together with the operation member 61 by the rotation means 65 (arrow H in Fig. 19). Further, in conjunction with the movement (rotation) of the placement member 62, the actuating member 61 has a non-operating position E1 (a position indicated by a solid line in Fig. 19) in which the locking mechanism 9 is not operated, and the locking mechanism 9 ) Is moved (rotated) to the operating position E2 (position indicated by the dotted line in Fig. 19).

The non-operating position E1 of the actuating member 61 is a position in which the actuating member 61 does not mesh with the teeth 35 of the ratchet wheel 36 (non-engaging position). Further, the operation position E2 of the operation member 61 is a position (engagement position) where the operation member 61 engages the teeth 35 of the ratchet wheel 36. By the placement member 62, the operation member 61 moves from the non-operation position E1 (non-engagement position) to the operation position E2 (engagement position) to operate the lock mechanism 9.

Specifically, as the arrangement member 62 moves, the operation member 61 approaches the ratchet wheel 36 or is spaced apart from the ratchet wheel 36. Further, like the lock claw 54 of the acceleration sensor 50, the operation member 61 engages the teeth 35 of the ratchet wheel 36 in the clutch receiving portion 6B at the opening 6M. Thereby, rotation of the ratchet wheel 36 is stopped, and the lock mechanism 9 is operated.

The second pressing means 64 always presses the operation member 61 toward the operation position E2. When the operation member 61 contacts the ratchet wheel 36, it is pressed against the ratchet wheel 36 by the second pressing means 64. On the other hand, the arrangement member 62 moves the actuating member 61 to the non-operating position E1 by the first pressing means 63 (the direction in which the actuating member 61 is separated from the ratchet wheel 36) (Here, it is always pressed in the radial direction of the moving member 70. In Fig. 19, the actuating member 61 is pressed so as to rotate counterclockwise by the second pressing means 64, and the placement member ( 62) is pressed to rotate clockwise by the first pressing means 63.

In a state in which the pressing force of the first pressing means 63 and the pressing force of the second pressing means 64 are balanced (a state shown in Fig. 19), the placing member 62 is located inside the radial direction of the moving member 70 , Are arranged at the first position F1 (position indicated by a solid line in Fig. 19) in the vicinity of the inner convex portion 72. The first position F1 of the placement member 62 is a position where the actuating member 61 is disposed in the non-operating position E1, and the actuating member 61 is disposed in the non-operating position E1 by the placement member 62. From that state, the placement member 62 moves the actuating member 61 to the actuating position E2 (the direction in which the actuating member 61 approaches the ratchet wheel 36) [here, the radius of the movable member 70 Direction outside], and is disposed at a second position F2 (a position indicated by a dotted line in Fig. 19) outside the first position F1. The second position F2 is a position at which the actuating member 61 is disposed at the actuating position E2, and the actuating member 61 is disposed at the actuating position E2 by the placing member 62.

In this way, the placement member 62 is disposed at the first position F1 and the second position F2 by the rotation of the rotating means 65. At the same time, the placement member 62 moves together with the actuating member 61 to place the actuating member 61 in the non-operating position E1 and the actuating position E2. Further, the first pressing means 63 is pressing the placement member 62 toward the first position F1. In the state where the placement member 62 is disposed at the second position F2, the pressing force of the first pressing means 63 is greater than the pressing force of the second pressing means 64, so that the placing member 62 is 63) moves to the first position F1, and the operation member 61 moves to the non-operation position E1.

20 is a perspective view of the operation member 61 and the arrangement member 62, and FIG. 21 is a cross-sectional view of a portion Y2 in FIG. 19.

As shown, the placement member 62 includes a cylindrical installation portion 62A installed on the rotation shaft 6K, an arm portion 62B protruding from the installation portion 62A, and a tip portion of the arm portion 62B. It has a contact portion 62C made of a projection formed in the. When the contact part 62C contacts the moving member 70 and moves, the arm part 62B rotates about the attachment part 62A, and the placement member 62 moves.

The operation member 61 includes a cylindrical mounting portion 61A installed on the rotation shaft 6K, an arm portion 61B protruding from the mounting portion 61A, and an engagement pawl formed at the tip end of the arm portion 61B. 61C). The engagement pawl 61C is an engagement portion (engagement claw) formed on the actuating member 61 and moves integrally with the actuating member 61. As the arm portion 61B rotates around the mounting portion 61A, the operation member 61 moves, and the engagement foul 61C engages the teeth 35 of the ratchet wheel 36.

The engagement foul 61C and the teeth 35 of the ratchet wheel 36 are formed to engage only when the ratchet wheel 36 rotates in the withdrawal direction P. The engagement foul 61C constitutes a part of the lock mechanism 9, and the lock mechanism 9 includes a ratchet wheel 36 and a engagement pawl 61C. The actuating member 61 arranges the engagement foul 61C at the position where it engages the teeth 35 by moving to the operating position E2, and moves the engagement foul 61C to the teeth 35 by moving to the non-operation position E1. Place it in a non-interlocking position. The locking mechanism 9 operates in association with the engagement of the teeth 35 and the engagement foul 61C. When the ratchet wheel 36 rotates in the winding direction (M), the engagement foul 61C relatively slides on the outer surface of the teeth 35 and rides over the teeth 35 at the tip of the teeth 35 .

When the installation portion 61A of the operation member 61 and the installation portion 62A of the placement member 62 are installed on the rotating shaft 6K, the arc portions 61D and 62D of the installation portions 61A and 62A are combined do. At that time, by pressing the second pressing means 64 (arrow G in Fig. 21), one end of the arc portions 61D and 62D comes into contact, and a gap between the other ends of the arc portions 61D and 62D ( 66) is formed. When the placement member 62 (in FIG. 21, only the cross section of the arc portion 62D is shown) moves to the first position F1, the actuating member 61 rotates by pressing by the placement member 62, and the gap 66 ) And move to the non-operating position E1. In addition, when the placement member 62 moves to the second position F2, with the movement of the placement member 62, the operation member 61 closes the gap 66 by pressing the second pressing means 64. While holding, move to operating position E2.

The engagement pawl 61C of the actuating member 61 engages only with the teeth 35 of the ratchet wheel 36 rotating in the withdrawal direction P. In that state, when the ratchet wheel 36 rotates in the winding direction M, the engagement foul 61C is pressed by the teeth 35. Thereby, in the state where the placement member 62 is stopped, the operation member 61 displaces along the teeth 35 while narrowing the gap 66, and rides over the plurality of teeth 35 in order.

Accordingly, the retractor 1 is provided with the displacement mechanism 67 of the operation member 61 configured as described above. With the placement member 62 held in the second position F2, by the displacement mechanism 67, the engagement foul 61C of the operation member 61 rotates together with the take-up drum 10 in the take-up direction (M). It is displaced along the teeth 35 of the ratchet wheel 36 to be. As a result, during the rotation of the ratchet wheel 36 in the winding direction M, the engagement foul 61C is reliably maintained in a state capable of being engaged with the plurality of teeth 35. When the ratchet wheel 36 rotates in the withdrawal direction P, the engagement foul 61C engages the teeth 35 again.

The placement member 62 (see Fig. 19) moves together with the actuating member 61 to move the actuating member 61 to the non-operating position E1 and the actuating position E2. By this movement, the operation member 61 and the placement member 62 control the rotatable direction of the ratchet wheel 36 and switch the state of the retractor 1. When the operation member 61 moves to the non-operation position E1 by the placement member 62, the ratchet wheel 36 becomes rotatable in the winding direction (M) and the drawing direction (P), and the state of the retractor 1 Is switched to the emergency lock state. When the operating member 61 moves to the operating position E2 by the placement member 62, the ratchet wheel 36 can be rotated only in the winding direction (M), and the state of the retractor 1 is automatically switched to the locked state. do.

By the moving member 70, the placement member 62 is disposed in the first position F1 and the second position F2, and the actuating member 61 is disposed in the non-operating position E1 and the actuating position E2. The moving member 70 rotates in conjunction with the rotation of the take-up drum 10, and moves the placement member 62 to the first position F1 and the second position F2 with the rotation. In addition, the movable member 70 includes an inner convex portion 72, an outer convex portion 73 surrounding the inner convex portion 72, and a first holding portion for holding the placement member 62 in a first position F1. (74), the change part (75), the moving part (76) for moving the placement member (62), the second holding part (77) that holds the placement member (62) in the second position F2, and release It has a part 78.

The inner convex portion 72 is a ring-shaped convex portion formed inside the movable member 70 in the radial direction. The outer convex portion 73 is a ring-shaped convex portion formed on the outer side of the movable member 70 in the radial direction, and is formed outside the inner convex portion 72 on one surface of the moving member 70. The center of the inner convex portion 72 and the center of the outer convex portion 73 coincide with the rotation center of the moving member 70, and the outer convex portion 73 is formed with a diameter larger than the diameter of the inner convex portion 72 Has been. The first holding portion 74 is formed of a ring-shaped path between the inner convex portion 72 and the outer convex portion 73 (the second holding portion 77). In the first holding portion 74, the placement member 62 (contact portion 62C) is disposed in the vicinity of the inner convex portion 72 without contacting the inner convex portion 72, and the inner convex portion 72 Move relative to each other.

22 to 24 are diagrams showing the operation of the placement member 62 accompanying the rotation of the moving member 70, and the retractor 1 is shown in the same manner as in FIG. 19. In addition, FIG. 22C is a cross-sectional view of the retractor 1 viewed in the arrow direction of line X3-X3 in FIG. 22B, and FIG. 23B is a cross-sectional view of the retractor 1 viewed in the direction of arrow X4-X4 in FIG. to be.

As shown, when the take-up drum 10 rotates in the take-out direction P or the take-up direction M by the take-out or take-up of the webbing 2, the moving member 70 is moved by the deceleration mechanism 80. It rotates in a direction opposite to the rotational direction of the winding drum 10. In addition, with the rotation of the movable member 70, the placement member 62 relatively moves in the circumferential direction of the movable member 70, along with the respective portions 74 to 77 of the movable member 70. Move relatively.

When the webbing 2 is completely wound around the take-up drum 10, the contact portion 62C of the placement member 62 is disposed on the first holding portion 74 (see Fig. 22A). Thereby, the placement member 62 is held in the first position F1, and the operation member 61 is maintained in the non-operating position E1. In that state, when the moving member 70 rotates by the pulling out of the webbing 2, the placement member 62 (contact part 62C) moves relatively along the first holding part 74. In addition, as the webbing 2 is pulled out and wound up, the placing member 62 moves relatively in the circumferential direction of the moving member 70 in the first holding portion 74. The contact portion 62C is disposed on the first holding portion 74 until the webbing 2 is drawn out from the take-up drum 10 by a predetermined length (a predetermined withdrawal length), and the placing member 62 is the first holding portion. It is held in the first position F1 by 74. As a result, the state of the retractor 1 is maintained in the emergency lock state.

When the webbing 2 is withdrawn from the take-up drum 10 for a predetermined length (see Figs. 22B and 22C), the placement member 62 is relatively displaced along the changing portion 75, and by the changing portion 75 , The position of the placement member 62 is changed from the first holding part 74 to the moving position by the moving part 76. The moving position by the moving part 76 is a position at which the placement member 62 becomes movable by the moving part 76. The placement member 62 moves to the moving position and then moves by the moving part 76. Here, the change portion 75 is an inclined surface that inclines from the first holding portion 74 toward the tip end of the moving portion 76, and is formed at the end portion of the first holding portion 74.

With the rotation of the moving member 70 due to the withdrawal of the webbing 2, the contact portion 62C of the placement member 62 contacts the change portion 75 and moves relatively toward the moving portion 76. . As a result, the arrangement member 62 is elastically deformed and displaced along the change portion 75 in a direction away from the moving member 70. Subsequently (refer to FIGS. 23A and 23B ), the placement member 62 crosses the moving portion 76 and returns to its original shape, and the contact portion 62C is disposed at a position capable of contacting the moving portion 76. Here, when the webbing 2 is completely withdrawn from the take-up drum 10, the position of the placement member 62 is changed from the first holding portion 74 to the moving portion 76 by the change portion 75. It is changed to the moving position. Thus, until the webbing 2 is completely withdrawn from the take-up drum 10, the placing member 62 is held in the first position F1 by the first holding portion 74.

When the webbing 2 drawn out by a predetermined length is wound on the take-up drum 10, the moving portion 76 of the moving member 70 moves the positioning member 62 as the first rotation of the moving member 70. It moves from the position F1 to the second position F2 (see Fig. 23C). The moving part 76 is made of an inclined part which inclines toward the second holding part 77, and is formed from the inner convex part 72 to the outer convex part 73 (the 2nd holding part 77). With the rotation of the moving member 70 by winding of the webbing 2, the placing member 62 contacts the moving part 76 and gradually moves along the moving part 76, and the moving part 76 It is induced from the first position F1 to the second position F2 by. Therefore, the moving part 76 is also a guide part for guiding the placement member 62 from the first position F1 to the second position F2.

Here, the moving part 76 is made of an inclined convex part which inclines toward the second holding part 77 from the moving position by the moving part 76 with respect to the rotational direction of the moving member 70, and the second holding It leads to the front end of the part 77. Further, when the webbing 2 completely drawn out from the take-up drum 10 is wound around the take-up drum 10, the placement member 62 moves by the moving portion 76. At that time, in a state in which the contact portion 62C of the placement member 62 is pressed against the moving portion 76 by the pressure of the first pressing means 63, it is guided by the moving portion 76, and the second holding portion ( 77). Thereby, the arranging member 62 moves toward the outer side in the radial direction of the movable member 70, and moves from the first position F1 to the second position F2 (see Fig. 24A). At the same time, the operation member 61 moves from the non-operation position E1 to the operation position E2, and the state of the retractor 1 is switched from the emergency lock state to the automatic lock state.

The second holding portion 77 is formed of an arc portion formed in an arc shape outside the radial direction of the first holding portion 74, and surrounds a part of the first holding portion 74. During winding of the webbing 2 drawn out by a predetermined length to the take-up drum 10, the placement member 62 contacts the second holding portion 77 and is held at the second position F2 by the second holding portion 77. do. Here, the second holding portion 77 is made of an arc-shaped convex portion constituting a part of the outer convex portion 73, and is formed in a predetermined length along the circumferential direction of the moving member 70. At the location where the moving part 76 and the second holding part 77 connect, the outer convex part 73 is not partially, so the contact part 62C of the placing member 62 is the second holding part from the moving part 76 It moves smoothly to (77). Further, the contact portion 62C is in contact with the second holding portion 77 and is pressed against the second holding portion 77 by pressing of the first pressing means 63. By pressing the contact portion 62C by the second holding portion 77, the placement member 62 is held by the second holding portion 77. Thereby, during the winding of the webbing 2 that has been completely drawn out, the placement member 62 is held in the second position F2.

By keeping the placement member 62 in the second position F2, the operation member 61 is held in the actuating position E2. As a result, the state of the retractor 1 is maintained in an automatic locking state, and only the rotation of the take-up drum 10 in the take-out direction P is stopped by the locking mechanism 9. With the rotation of the moving member 70 due to the winding of the webbing 2, the placement member 62 (contact portion 62C) moves relatively along the second holding portion 77 and holds the second It moves relatively toward the end part 79 of the part 77 and the release part 78 of the moving member 70 (refer FIG. 24B). By the second holding portion 77, the placement member 62 is held in the second position F2 until the webbing 2 is wound around the take-up drum 10 by a predetermined length (a predetermined take-up length). Further, when the webbing 2 is wound on the take-up drum 10 for a predetermined length, the placement member 62 is removed from the end portion 79 of the second holding portion 77, and is removed by the release portion 78. 1 It is released toward the holding part 74. The placement member 62 is removed from the end portion 79 before the webbing 2 is completely wound on the take-up drum 10.

In the end portion 79 of the second holding portion 77, since the outer convex portion 73 is not partially, the contact portion 62C of the placement member 62 reaches the terminal portion 79, and then the second holding portion Removed from (77). Thereby, the contact portion 62C is released from the state pressed by the second holding portion 77, and the placement member 62 is released from the second holding portion 77. The release portion 78 of the movable member 70 is a portion connected to the end portion 79 and is formed of a release region formed from the second holding portion 77 to the first holding portion 74. In the release part 78, the placement member 62 does not contact the movable member 70, but toward the inside of the movable member 70 in the radial direction, from the second holding part 77 to the first holding part 74 ).

When the webbing 2 is wound on the take-up drum 10 for a predetermined length, and the placement member 62 is removed from the end portion 79 of the second holding portion 77, the release portion 78 becomes the placement member 62 ) Is released from the second holding portion 77 toward the first holding portion 74 (see Fig. 19). With this release, the placement member 62 is pressed by the first pressing means 63 from the second holding portion 77 (the second position F2) to the first holding portion 74 (the first position F1). ) To move immediately. At the same time, the operation member 61 moves from the operation position E2 to the non-operation position E1, and the state of the retractor 1 is switched from the automatic lock state to the emergency lock state. Thereafter, the webbing 2 is wound on the take-up drum 10 or is taken out from the take-up drum 10.

As described above, in the retractor 1 of the present embodiment (refer to FIG. 15 ), the restricting member 56 presses the lock arm 40 by the pressing portion 57 by the engaging portion 44. It remains regulated. Therefore, when the webbing 2 is wound up, the occurrence of end locks in the retractor 1 can be reliably suppressed. Further, regardless of the magnitude of the frictional force generated between the installation portion 58 of the regulation member 56 and the center support portion 6H, the regulation member 56 can be stably maintained in the regulated state. Since the generation of the end lock is suppressed by one restricting member 56, an increase in the number of parts of the retractor 1 can be prevented.

The regulating member 56 presses the engaging portion 44 by the pressing portion 57 to regulate the displacement of the lock arm 40 in the lock operation direction L. Thereby, the displacement of the lock arm 40 can be reliably regulated while maintaining the engaging portion 44 in a state of being engaged with the pressing portion 57. In addition, since the engaging portion 44 is made of a convex portion applied to the pressing portion 57, it is possible to smoothly engage and release the engaging portion 44 and the pressing portion 57.

The engaging portion 44 restrains the pressing portion 57 and prevents the movement of the pressing portion 57, so that the displacement of the lock arm 40 in the locking operation direction L can be suppressed more reliably. Further, since the engaging portion 44 is pressed against the pressing portion 57 to apply a force in the direction of preventing the movement of the pressing portion 57 to the pressing portion 57, the pressing portion 57 is applied to the engaging portion 44 ) To prevent movement. Unnecessary movement of the lock arm 40 can be suppressed by the frictional force generated between the mounting portion 58 of the regulating member 56 and the central support portion 6H, and the regulating member 56 is brought into a regulated state. You can keep it more reliably.

By arranging the rotation center N1 of the regulation member 56 at a position different from the rotation center N2 of the lock arm 40, the rotation of the regulation member 56 accompanying the engagement of the engagement portion 44 and the pressing portion 57 ( Movement) can be easily suppressed. When setting the displacement direction S2 of the engaging portion 44 in a direction crossing the rotational direction S1 of the pressing portion 57, the regulation member 56 is applied by the force in the displacement direction S2 of the engaging portion 44. ) Does not rotate, and is held by the coupling portion 44 in a state in which the regulating member 56 cannot be rotated. Thereby, it is possible to more surely hold the regulating member 56 in the regulated state.

Since the pressing portion 57 is in contact with a position spaced apart from the engaging portion 44 of the lock arm 40, the engaging portion 44 is pressed when rotating in the winding direction M of the ordinary winding drum 10. It is not bound to the part 57. Further, when the take-up drum 10 is rotated in the take-out direction P, the pressing portion 57 is reliably and smoothly separated from the lock arm 40. As a result, the regulating member 56 does not interfere with the pull-out and winding of the webbing 2, and the normal function of the lock arm 40 is reliably exhibited.

In addition, with respect to the switching means 60 (see Fig. 19) for switching the state of the retractor 1, the pressing force of the first pressing means 63 while the placing member 62 is held in the first position F1 It may be made larger than the pressing force of the second pressing means 64. In this case, the contact portion 62C of the placement member 62 contacts the inner convex portion 72 in the first holding portion 74 and is pressed by the inner convex portion 72. Further, when the placement member 62 is relatively displaced along the change portion 75, the placement member 62 may not elastically deform, and the movable member 70 may elastically deform.

The operation member 61 may be an elastically deformable member. In this case, for example, when the operation member 61 moves to the operation position E2, it is pressed against the teeth 35 of the ratchet wheel 36 to elastically deform. At that time, the operation member 61 is pressed toward the operation position E2 by an elastic force. Therefore, since the operation member 61 itself serves as a pressing means, there is no need to separately install the second pressing means 64, and the number of parts is reduced. Further, the operation member 61 and the placement member 62 may be integrally formed to reduce the number of parts. Also in this case, the operation member 61 is pressed toward the operation position E2 by elastic deformation.

The placement member 62 is held in the first position F1 by the first holding portion 74 of the moving member 70 until the webbing 2 is drawn out from the take-up drum 10 for a predetermined length. The predetermined length of this webbing 2 is set to an arbitrary length. Therefore, the predetermined length may be the entire length of the webbing 2 or may be shorter than the total length.

The deceleration mechanism 80 is not limited to the example of this embodiment, and a known deceleration mechanism can be used. In addition, the engagement pawl 61C may not be formed on the actuating member 61, and the engagement pawl 61C may be a member different from the actuating member 61. In this case, the operation member 61 moves the engagement foul 61C to the non-engagement position and the engagement position. The actuating member 61 and the placement member 62 may be provided on different rotation shafts and rotated in conjunction with each other. By doing in this way, the arrangement space of the operation member 61 and the arrangement member 62 in the axial direction of the rotation shaft can be reduced.

DESCRIPTION OF SYMBOLS 1 Retractor 2 Webbing 3 Housing unit 4 Winding drum unit 4A Movable foul 4B Engaging claw 4C Interlocking pin 5 Winding spring unit 6 Mechanism cover unit 6A Mechanism Cover, 6B: clutch receiving portion, 6C: sensor receiving portion, 6D: sensor cover, 6E: opening, 6F: ring-shaped wall, 6G: stop, 6H: center support, 6I: insertion hole, 6J: coupling teeth, 6K : Rotation shaft, 6L: ring-shaped support part, 6M: opening, 6V: outer cover, 7: anti-fall pin, 8: clutch unit, 9: locking mechanism, 10: winding drum, 11: insertion part, 12: 1st shaft, DESCRIPTION OF SYMBOLS 13 2nd shaft 14 Foul receiving part 15 Concave part 16 Protrusion 17 Cap 18 Release means 19 Transmission mechanism 20 Housing 21 Back plate part 22 1st side wall part , 23: second side wall portion, 24: fixed plate, 25: first opening, 26: lock tooth, 27: second opening, 30: locking clutch, 31: center hole, 32: spring holder, 33: guide groove, 34 : Through groove, 35: tooth, 36: ratchet wheel, 37: arm support part, 38: support pin, 39A, 39B, 39C: stopper, 40: lock arm, 41, 42: end, 43: through hole, 44: coupling Part, 45: sliding part, 46: coupling surface, 47: concave part, 50: acceleration sensor, 51: sensor holder, 52: inertial mass, 53: sensor lever, 54: locking claw, 56: regulating member, 57 Compression unit, 58: installation unit, 59: contact unit, 60: switching means, 61: operation member, 62: placement member, 63: first pressing means, 64: second pressing means, 65: rotating means, 66: gap, 67: displacement mechanism, 70: moving member, 71: center hole, 72: inner convex portion, 73: outer convex portion, 74: first holding portion, 75: side Neck, 76: moving portion, 77: second holding portion, 78: release portion, 79: end portion, 80: reduction mechanism, 81: drive gear, 82: intermediate gear, 83: driven gear, L: lock operation direction, M: winding direction, P: drawing direction

Claims (9)

A housing including a pair of opposite sidewalls,
A winding drum that is rotatably accommodated in a winding direction and a pulling direction of the webbing between the pair of side wall portions to wind up the webbing,
A locking clutch that rotates together with the take-up drum in normal times and is capable of being rotated relative to the take-up drum in an emergency,
A mechanism cover installed in the housing and accommodating the locking clutch,
A displacement member that is rotatably supported by the locking clutch, displaces according to the acceleration of rotation in the webbing take-out direction of the take-up drum, is coupled to a stop formed on the inner circumference of the mechanism cover, and stops the rotation of the locking clutch in the webbing take-out direction Wow,
A foul that moves to the locked position and stops the rotation of the take-up drum in the webbing take-out direction along with the rotation of the take-up drum in the webbing take-out direction relative to the locking clutch in which the rotation in the webbing take-out direction is stopped by the displacement member. and,
A seat belt retractor provided with a regulating member that regulates the displacement of the displacement member due to inertial force when the rotation of the webbing winding direction of the winding drum is stopped,
The mechanism cover has a supporting portion for a regulating member that supports the regulating member so as to be rotatable concentrically with the locking clutch, and generates a frictional force between the regulating member,
The regulating member has a pressing portion that regulates the displacement of the displacement member at its tip,
When the locking clutch rotates in the webbing pulling direction from the state in which the pressing portion is in contact with the displacement member, the restricting member rotates relative to the locking clutch due to the frictional force generated between the support portion for the regulating member and the regulating member, and the pressing portion is displaced. As the locking clutch rotates in the webbing winding direction from the state where the pressing portion is separated from the displacement member while being separated from the member, the regulating member is relative to the locking clutch by the frictional force generated between the supporting portion for the regulating member and the regulating member. Rotates to the left, and the pressing part contacts the displacement member,
The displacement member has an engaging portion that is pressed against the pressing portion of the regulating member when it is rotated by an inertial force when the rotation in the webbing winding direction of the winding drum is stopped in contact with the pressing portion of the regulating member,
The engaging portion of the displacement member has an engaging surface that engages the pressing portion of the regulating member,
Rotation of the regulating member by the engagement portion of the displacement member when the normal line of the contact portion of the engagement surface with the pressing portion passes through a position deviated from the rotation center of the regulating member or the rotation center of the regulating member toward the rotation center of the displacement member. A retractor for a seat belt in which a force directed toward the center is applied to the pressing portion of the regulating member, and the regulating member is held in a state that regulates the displacement of the displacement member. delete delete delete delete delete delete delete delete

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