JP4308734B2 - Webbing take-up device - Google Patents

Description

  The present invention relates to a webbing take-up device, and more particularly to a webbing take-up device capable of winding a webbing by rotating a take-up shaft by a motor.

  The occupant restraint seat belt device includes a webbing take-up device. In this webbing take-up device, a so-called tension reducer mechanism for reducing or eliminating excessive pressure feeling when the webbing is mounted, and a webbing belt is wound around a take-up shaft by a certain amount in a vehicle sudden deceleration state or the like. There are some which provide a pretensioner mechanism that eliminates a slight slack called `` slack '' and the like and increases the restraining force of the occupant's body by the webbing belt, and holds the occupant's body more securely. A so-called motor retractor in which each function is performed by a motor is known (see Patent Document 1 and Patent Document 2 as examples).

  In this type of motor retractor, for example, not only can the function of a tension reducer and pretensioner be exhibited as described above, but also it is possible to assist in winding and pulling out the webbing when wearing a normal webbing, Very useful.

  Further, particularly in recent years, in the motor retractor as described above, the distance to other vehicles and obstacles in front is detected by a forward monitoring device such as a distance sensor, and the distance to the vehicle and obstacles ahead is a constant value. If it is less than that, a configuration is considered in which the motor is operated and the winding shaft is rotated in the winding direction by the rotational force of the motor.

  Incidentally, in the case of the motor retractor as described above, a driving force transmission system for transmitting the rotational force of the motor to the winding shaft only when necessary and rotating it in the winding direction includes a plurality of driving force transmission systems connected to the rotating shaft of the motor. The motor gear portion is composed of a spur gear, the clutch is connected to a winding shaft, and the worm gear (worm gear shaft) is connected to connect the motor gear portion and the clutch. Here, the plurality of spur gears of the motor gear portion are accommodated in the gear housing, and the final spur gear connected to the worm gear among the plurality of spur gears is rotatably supported by the gear housing. (Retained).

However, in such a configuration, a bearing member (gear cushion) as a separate component from the final spur gear and gear housing in order to reliably support the final spur gear and prevent vibration and wear. Is an indispensable configuration, which causes deterioration of the assembling property of each part and an increase in the number of parts, and there is a demand for improvement.
JP 2001-130376 A JP 2001-347923 A

  In consideration of the above facts, the present invention provides a driving force transmission system for transmitting the rotational force of the motor to the winding shaft only when necessary and rotating it in the winding direction, from a plurality of gears connected to the rotating shaft of the motor. When the motor gear portion, the clutch connected to the take-up shaft, and the gear shaft connecting the motor gear portion and the clutch are provided, the assembly of the gear of the motor gear portion is improved and the number of parts is reduced. The object is to obtain a webbing take-up device.

  The webbing take-up device according to the first aspect of the present invention includes a frame in which a pair of leg plates facing each other are connected by a back plate, and the pair of leg plates in an axial direction along the opposing direction of the pair of leg plates. Between a pair of leg plates and a take-up shaft that is rotatably supported between the leg plates, the base end portion of the webbing belt for restraining passengers is locked, and the webbing belt is wound around in one direction around the shaft. And a motor gear portion composed of a plurality of gears connected to a rotation shaft of the motor and housed in a gear housing, and in a joined state to a side surface of one of the pair of leg plates. Accommodated in the attached clutch case, mechanically interposed between the motor and the winding shaft, and transmitting the rotation of the motor to the winding shaft to rotate the winding shaft; Winding A clutch that blocks transmission of rotation generated on the side and prevents the rotation from being transmitted to the motor, and a gear shaft that is housed in the clutch case and is detachably connected to the gear of the motor gear portion A clutch gear portion that meshes with the gear shaft and transmits a rotational force of the gear shaft to the clutch, and the gear of the motor gear portion is separated from the gear housing by the gear shaft. It is characterized by being pivotally supported.

  In the webbing take-up device according to claim 1, the occupant sits on the seat of the vehicle, hangs the webbing belt on the body, for example, by engaging a tongue plate provided on the webbing belt with the buckle device. The belt is attached to the occupant body.

  Further, for example, when an obstacle is present in front of the vehicle while the vehicle is traveling and the distance between the vehicle and the obstacle (distance from the vehicle to the obstacle) reaches a predetermined range, the driving of the motor is started. Here, a plurality of gears of the motor gear portion are connected to the rotation shaft of the motor, and further, a gear shaft of the clutch gear portion is connected to this gear, and a wheel meshes with the gear shaft. Yes. For this reason, when the motor is driven, the driving force is transmitted to the clutch by the plurality of gears of the motor gear portion, the gear shaft and the wheel of the clutch gear portion, and the rotational force is transmitted to the take-up shaft via the clutch. The take-up shaft is rotated in the webbing take-up direction. As a result, the webbing belt is wound around the take-up shaft from the base end side, and the slight slackness of the webbing belt in the mounted state, so-called “slack” is eliminated, and the restraining force of the occupant's body by the webbing belt can be increased. it can.

  Here, in the webbing retractor according to the first aspect, the gear of the motor gear portion is pivotally supported by the gear shaft independently of the gear housing. That is, the gear of the motor gear portion connected to the gear shaft is not supported (held) by the gear housing, but is directly supported by the gear shaft. This eliminates the need for a separate bearing member (gear cushion) for reliably supporting the gear and preventing vibration and wear, improving the assembly of the gear of the motor gear and reducing the number of parts. become.

  For this reason, the gear housing has a simple structure in the shape of the gear housing portion, and it is only necessary to provide a simple through-hole through which the gear shaft is inserted, so that the manufacture becomes easy.

  A webbing take-up device according to a second aspect of the present invention includes a frame in which a pair of leg plates facing each other are coupled together by a back plate, and the pair of leg plates in a state in which an axial direction is along an opposing direction of the pair of leg plates. A winding shaft that is rotatably supported between the leg plates of the vehicle, and that winds up the webbing belt by rotation in one direction around the shaft with the base end portion of the webbing belt for restraining the passenger being locked, and is attached to the gear housing A motor disposed between the pair of leg plates in a state where the rotating shaft is orthogonal to the winding shaft, and a shaft of the motor is disposed in parallel with the rotating shaft of the motor and coupled to the rotating shaft of the motor. And a motor gear part composed of a plurality of spur gears housed in the gear housing, and housed in a clutch case attached in a joined state to the side surface of one of the pair of leg plates, Mechanically interposed between the motor and the winding shaft, transmitting the rotation of the motor to the winding shaft to rotate the winding shaft, and transmitting the rotation generated on the winding shaft side A clutch that prevents the rotation from being transmitted to the motor, and is housed in the clutch case, and its own shaft is arranged in a state parallel to the rotation shaft of the motor. A worm gear that is separably connected to a tooth gear, and a clutch gear portion that is arranged coaxially with the winding shaft and that engages with the worm gear and transmits the rotational force of the worm gear to the clutch. The final spur gear of the motor gear portion is pivotally supported by the worm gear independently of the gear housing.

  In the webbing take-up device according to claim 2, the occupant sits on the seat of the vehicle, hangs the webbing belt on the body, for example, by engaging a tongue plate provided on the webbing belt with the buckle device. The belt is attached to the occupant body.

  Further, for example, when an obstacle is present in front of the vehicle while the vehicle is traveling and the distance between the vehicle and the obstacle (distance from the vehicle to the obstacle) reaches a predetermined range, the driving of the motor is started. Here, a plurality of spur gears of the motor gear portion are connected to the rotating shaft of the motor, and a worm gear of the clutch gear portion is connected to the final spur gear of the motor gear portion. The worm wheel is engaged. For this reason, when the motor is driven, the driving force is transmitted to the clutch by the plurality of spur gears of the motor gear portion, the worm gear and the worm wheel of the clutch gear portion, and the rotational force is transmitted to the winding shaft via the clutch. The winding shaft is rotated in the webbing winding direction. As a result, the webbing belt is wound around the take-up shaft from the base end side, and the slight slackness of the webbing belt in the mounted state, so-called “slack” is eliminated, and the restraining force of the occupant's body by the webbing belt can be increased. it can.

  Here, in the webbing take-up device according to the second aspect, the final spur gear of the motor gear portion is pivotally supported by the worm gear independently of the gear housing. In other words, the final spur gear of the motor gear connected to the worm gear is not supported (held) by the gear housing, but is directly supported by the worm gear. This eliminates the need for a separate bearing member (gear cushion) for reliably supporting the final spur gear and preventing vibration and wear, and improves the assembly of the spur gear of the motor gear part. The score will also be reduced.

  For this reason, the gear housing has a simple configuration in the shape of the housing portion of the final spur gear, and it is only necessary to provide a simple through hole through which the worm gear is inserted.

  As described above, the webbing take-up device according to the present invention is connected to the rotation shaft of the motor as a driving force transmission system for transmitting the rotation force of the motor to the take-up shaft only when necessary and rotating it in the take-up direction. Assembly of the motor gear portion is improved when the motor gear portion is composed of a plurality of gears, the clutch is connected to the take-up shaft, and the gear shaft is connected to the motor gear portion and the clutch. However, it has an excellent effect of reducing the number of parts.

  FIG. 1 is an exploded perspective view showing the overall configuration of a webbing take-up device 10 according to an embodiment of the present invention. 2 and 3 are exploded perspective views showing the configuration of the main part of the webbing take-up device 10, and FIGS. 4 and 5 show the main part of the webbing take-up device 10. The configuration is shown in cross section. Further, FIG. 6 is a perspective view showing the overall configuration of the webbing take-up device 10, and FIG. 7 is a perspective view showing the configuration of the main part of the webbing take-up device 10.

  The webbing take-up device 10 includes a frame 12. The frame 12 includes a substantially plate-like back plate 14 and a pair of leg plates 16 and 18 that extend integrally from both ends of the back plate 14 in the width direction. The back plate 14 is a fastening member (not shown) such as a bolt. It is configured to be attached to the vehicle body by being fixed to the vehicle body by means.

  Between the pair of leg plates 16 and the leg plates 18 of the frame 12, a winding shaft 20 manufactured by die casting or the like is rotatably arranged. The winding shaft 20 has a drum shape as a whole, and a base end portion of a webbing belt (not shown) formed in a long belt shape is connected and fixed. When the winding shaft 20 is rotated to one side around the axis (hereinafter, this direction is referred to as “winding direction”), the webbing belt is wound in layers on the outer periphery of the winding shaft 20 from the base end side, On the other hand, when the webbing belt is pulled from the front end side, the webbing belt is pulled out while the winding shaft 20 rotates (hereinafter, the rotation direction of the winding shaft 20 when the webbing belt is pulled out is referred to as “drawing direction”). Called).

  One end side of the winding shaft 20 passes through the leg plate 18 and protrudes to the outside of the frame 12. A locking mechanism (not shown) is arranged on the side of the leg plate 18. The lock mechanism is configured to include an acceleration sensor, and is linked to a lock plate 22 spanned between the leg plate 16 and the leg plate 18 and a torsion bar 24 provided at the shaft core portion of the take-up shaft 20. ing. When the vehicle is suddenly decelerated or the like, one end of the torsion bar 24 is restrained via the lock plate 22 by the operation of the lock mechanism, and energy absorption is performed, while the take-up shaft 20 is prevented from rotating in the pull-out direction. It has become.

  On the other hand, a connecting screw 21 is attached to the other end side of the winding shaft 20. The connecting screw 21 penetrates the leg plate 16 and protrudes outward from the frame 12, and a clutch 26 and a clutch gear portion 28 are disposed outside the leg plate 16.

  The clutch 26 and the clutch gear portion 28 are both housed in a case 30 as a clutch case, and the clutch 26 is connected to the connecting screw 21. The clutch 26 is linked to a gear wheel 32 that constitutes the clutch gear portion 28. The gear wheel 32 is a so-called worm wheel in which worm wheel teeth are formed on the outer peripheral edge. The gear wheel 32 is arranged coaxially with the winding shaft 20, and this gear wheel 32 is mechanically connected to the coupling screw 21 (that is, the winding shaft 20) via the clutch 26. For this reason, when the gear wheel 32 rotates, a driving force is transmitted through the clutch 26, the winding shaft 20 is rotated in the winding direction, and transmission of rotation generated on the winding shaft 20 side is cut off. The rotation is prevented from being transmitted to the gear wheel 32. Further, the tip of the connecting screw 21 connected to the clutch 26 extends laterally through the clutch 26.

  A worm gear 34 (worm gear shaft) that constitutes the clutch gear portion 28 is provided in the case 30. The worm gear 34 has its own shaft disposed in a state orthogonal to the winding shaft 20, and its end is supported by the case 30 via bushes 36 and 37 and meshed with the gear wheel 32, One end side is provided to protrude outward from the case 30. Further, a steel ball 38 is accommodated in the bearing portion of the case 30 that supports the tip portion of the worm gear 34 and is in contact with the tip portion of the worm gear 34, and an adjustment screw 40 is screwed. The adjusting screw 40 presses the steel ball 38 at its tip, thereby pressing the steel ball 38 against the tip of the worm gear 34. Thereby, the axial displacement of the worm gear 34 is regulated (thrust adjustment). The gear wheel 32 is rotated by rotating the worm gear 34.

  The case 30 that houses the clutch 26 and the clutch gear portion 28 configured as described above is covered with a cover clutch 31.

  As described above, the clutch 26 and the clutch gear portion 28 are integrally assembled to the single case 30 and are configured as a unit as a whole.

  A spring complete 42 is disposed on the side of the clutch 26 and the clutch gear portion 28 (case 30). The spring complete 42 accommodates a spiral spring (not shown) inside. In the spiral spring, the end on the outer side in the spiral direction is locked to the case body, and the end on the inner side in the spiral direction is locked to the tip of the connecting screw 21 that penetrates the clutch 26. Is energized in the winding direction.

  On the other hand, a motor 44 and a motor gear portion 46 are disposed below the winding shaft 20 and between the leg plate 16 and the leg plate 18.

  As shown in FIGS. 2 and 3, the motor 44 and the motor gear portion 46 include a housing 48 as a gear housing manufactured by die casting or the like. A motor 44 is attached to one side of the housing 48 by a screw 47, and a motor gear portion 46 is provided on the other side of the housing 48. The motor 44 is fixed to one side of the housing 48 with the front end side (output side) of the rotary shaft facing the housing 48, and the front end (output side) of the rotary shaft is the other side (motor gear portion 46). Projecting to the side).

  On the other hand, pinions 72 constituting a plurality of spur gears of the motor gear portion 46 are attached to the tip of the rotating shaft of the motor 44 protruding to the other side of the housing 48 (motor gear portion 46 side). The motor gear portion 46 accommodates a gear 74 and a gear 76 constituting a driving force transmission mechanism, each of which is an external spur gear, in mesh with each other. These gears 74 and 76 are both arranged with their own axes parallel to the rotation axis of the motor 44, and the gear 74 meshes with the pinion 72. The gear 76, which is the final spur gear, is detachably connected to one end portion of the worm gear 34 that protrudes outward from the case 30 of the clutch gear portion 28 described above.

  Here, in FIG. 4, the configuration of the connecting portion between the gear 76 and the worm gear 34 is shown in a sectional view. One end portion of the worm gear 34 protruding outward from the case 30 of the clutch gear portion 28 is inserted through a through hole 49 formed in the housing 48, and the gear 76 is connected to one end portion of the worm gear 34. . That is, the gear 76 is directly supported by the worm gear 34 itself independently of the housing 48.

  Thus, when the motor 44 is driven, the driving force is transmitted through the pinion 72, the gear 74, and the gear 76, and the worm gear 34 is rotated.

  The pinion 72, the gear 74, and the gear 76 are covered with a cover gear 78 attached to the housing 48. Here, in FIG. 5, a configuration of a fixing portion of the housing 48 and the cover gear 78 is shown in a sectional view. In FIG. 5, only the housing 48 and the cover gear 78 are shown, and other parts are omitted.

  A claw receiving portion 82 is provided on the outer peripheral wall of the housing 48 so as to protrude outward, and a recess 83 is formed in a so-called stepped state at the front end portion of the outer peripheral wall corresponding to the claw receiving portion 82. . The cover gear 78 is provided with a claw portion 80 corresponding to the claw receiving portion 82. The cover gear 78 is fixed to the housing 48 by engaging and locking the claw receiving portion 82 from the outside while the intermediate portion of the claw portion 80 enters the recess 83 provided in the housing 48. It has become.

  Thus, both the motor 44 and the motor gear portion 46 are integrally assembled in a single housing 48 and are configured as a unit as a whole.

  In the motor 44 and the motor gear portion 46 configured as described above, the mounting stay 84 provided integrally with the housing 48 can be attached to and detached from the case 30 (that is, the frame 12) housing the clutch 26 and the clutch gear portion 28 by the screw 86. It is attached.

  Here, as shown in FIGS. 2 and 3, a positioning boss 85 is formed to protrude from the mounting stay 84, and an end surface of the case 30 (an end surface orthogonal to the case thickness direction and opposite to the back plate 14). ) Has a positioning hole 87 corresponding to the positioning boss 85. That is, the positioning boss 85 is fitted into the positioning hole 87 and the mounting stay 84 is fastened and fixed to the case 30 by the screw 86, whereby the housing 48 (the motor 44 and the motor gear portion 46) is assembled to the case 30 (that is, the frame 12). The mounting position is uniquely specified, and the housing 48 is assembled and fixed facing the axial direction of the worm gear 34.

  In a state where the housing 48 is attached to the case 30 (frame 12), the motor 44 is in a state in which the rotating shaft is orthogonal to the winding shaft 20 and the output side is directed to the opposite side of the back plate 14 of the frame 12. In addition, the structure is located between the pair of leg plates 16 and the leg plates 18 and directly below the take-up shaft 20.

  Further, here, the motor 44 and the motor gear portion 46 configured as described above are separably coupled to the worm gear 34 of the clutch 26 and the clutch gear portion 28 with a gear 76 as a final spur gear of the motor gear portion 46. In addition, since the housing 48 (mounting stay 84) is detachably attached to the case 30 with the screw 86, the screw 44 is removed and the housing 48 is removed from the case 30, so that the motor 44 and the motor gear portion 46 are in an assembled state. It is configured so that it can be separated from the case 30 (frame 12) independently.

  Furthermore, the motor 44 described above is configured to be operated based on a detection signal from a forward monitoring device, for example.

  Next, the operation of this embodiment will be described.

  In the webbing take-up device 10 configured as described above, an occupant sits on a vehicle seat, hangs the webbing belt around the body, and, for example, engages a tongue plate provided on the webbing belt with the buckle device. It will be in the wearing state for the passenger body.

  Here, even when the webbing belt is wound and pulled out due to the movement of the occupant in the state where the webbing belt is worn, that is, even if the winding shaft 20 rotates in the winding direction or the pulling direction, the clutch 26, the rotational force of the winding shaft 20 is not transmitted to the rotational shaft of the motor 44.

  On the other hand, for example, when an obstacle is present in front of the vehicle while the vehicle is running and the distance between the vehicle and the obstacle (the distance from the vehicle to the obstacle) reaches a predetermined range, the driving of the motor 44 is started, The rotating shaft is rotated rapidly.

  When the rotation shaft of the motor 44 is rotated, the rotational force is transmitted to the clutch 26 by the pinion 72, the gear 74, and the gear 76 of the motor gear portion 46, and the worm gear 34 and the gear wheel 32 of the clutch gear portion 28. Further, the rotational force is transmitted to the winding shaft 20 through the clutch 26, and the winding shaft 20 is rotated in the webbing winding direction. As a result, loosening of the webbing belt, so-called “slack”, is eliminated, and the restraining force of the webbing belt on the occupant's body is improved. Even when the vehicle is decelerated, the webbing belt reliably holds the occupant's body.

  Further, when the motor 44 is stopped in such a state that the slack is eliminated, the mechanical connection between the rotating shaft of the motor 44 and the winding shaft 20 is released.

  Here, in the webbing take-up device 10 according to the present embodiment, the gear 76 as the final spur gear of the motor gear portion 46 is directly supported by the worm gear 34 independently of the housing 48. ing. That is, the gear 76 of the motor gear portion 46 connected to the worm gear 34 is not supported (held) by the housing 48 but is directly supported by the worm gear 34. This eliminates the need for a separate bearing member (gear cushion) for reliably supporting the gear 76 and preventing vibration and wear, resulting in improved assembly of the gear 76 of the motor gear portion 46. In addition, the number of parts is also reduced.

  For this reason, the housing 48 has a simple configuration in which the housing portion of the gear 76 is simple, and it is only necessary to provide a simple through-hole 49 through which the worm gear 34 is inserted, and the manufacture of the housing 48 is facilitated.

  Further, in the webbing take-up device 10 according to the present embodiment, the housing 48 is provided with a claw receiving portion 82 protruding outward on the outer peripheral wall thereof, and the outer peripheral wall tip corresponding to the claw receiving portion 82 is provided. A recess 83 is formed in the portion in a so-called stepped state. Further, the cover gear 78 is provided with a claw portion 80 corresponding to the claw receiving portion 82. The cover gear 78 is fixed to the housing 48 by engaging and locking the claw receiving portion 82 from the outside while the intermediate portion of the claw portion 80 enters the recess 83 provided in the housing 48. It has become.

  Here, for example, if the housing 48 is provided with a claw-locking square hole, so-called deburring is required after the housing 48 is molded. Subsequent deburring is not required, which also facilitates the manufacture of the housing 48.

  Furthermore, since the claw portion 80 of the cover gear 78 is fitted and locked to the claw receiving portion 82 from the outside with the intermediate portion thereof entering the recess 83 of the housing 48, even when it is unnecessarily dropped, etc. Further, it becomes difficult for an external force to act directly on the claw portion 80 of the resin cover gear 78, and damage and dropout can be prevented.

It is a disassembled perspective view which shows the whole structure of the webbing winding device concerning an embodiment of the invention. It is a disassembled perspective view which shows the structure structure of the motor and motor gear part of the webbing retractor which concerns on embodiment of this invention. It is a perspective view which shows the structure of the assembly fixing of the motor and motor gear part of the webbing winding device which concerns on embodiment of this invention. It is sectional drawing which shows the structure of the connection part of the gear and worm gear in the motor gear part of the webbing winding device concerning an embodiment of the invention. It is sectional drawing which shows the structure of the fixing | fixed part of the housing and cover gear of the motor gear part of the webbing winding device concerning an embodiment of the invention. 1 is a perspective view showing an overall configuration of a webbing take-up device according to an embodiment of the present invention. It is a perspective view which shows the structure of the motor drive force transmission system | strain of the webbing winding device concerning an embodiment of the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Webbing winding device 12 Frame 14 Back plate 16 Leg plate 18 Leg plate 20 Winding shaft 26 Clutch 28 Clutch gear part 30 Case (clutch case)
32 Gear wheel
34 Worm gear (gear shaft)
44 Motor 46 Motor gear 48 Housing (Gear housing)
72 pinion 74 gear 76 gear (final spur gear)
78 Cover gear

Claims (2)

A frame in which a pair of leg plates facing each other are connected by a back plate, and
Rotation is supported between the pair of leg plates in a state where the axial direction is along the opposing direction of the pair of leg plates, and the base end portion of the webbing belt for restraining the passenger is locked to rotate in one direction around the axis. A winding shaft for winding the webbing belt with,
A motor disposed between the pair of leg plates;
A motor gear portion composed of a plurality of gears coupled to the rotation shaft of the motor and housed in a gear housing;
It is accommodated in a clutch case attached in a joined state to the side surface of one of the pair of leg plates, and mechanically interposed between the motor and the winding shaft, and the rotation of the motor is A clutch that transmits to the winding shaft to rotate the winding shaft, and interrupts transmission of rotation generated on the winding shaft side to prevent the rotation from being transmitted to the motor;
A clutch gear portion comprising a gear shaft housed in the clutch case and detachably connected to the gear of the motor gear portion; and a wheel that meshes with the gear shaft and transmits a rotational force of the gear shaft to the clutch;
With
The gear of the motor gear portion is supported by the gear shaft independently of the gear housing,
A webbing take-up device characterized by that. A frame in which a pair of leg plates facing each other are connected by a back plate, and
Rotation is supported between the pair of leg plates in a state where the axial direction is along the opposing direction of the pair of leg plates, and the base end portion of the webbing belt for restraining the passenger is locked to rotate in one direction around the axis. A winding shaft for winding the webbing belt with,
A motor attached to the gear housing and disposed between the pair of leg plates in a state where the rotation shaft is orthogonal to the winding shaft;
A motor gear portion including a plurality of spur gears, the shaft of which is arranged in parallel with the rotation shaft of the motor, is connected to the rotation shaft of the motor, and is housed in the gear housing;
It is accommodated in a clutch case attached in a joined state to the side surface of one of the pair of leg plates, and mechanically interposed between the motor and the winding shaft, and the rotation of the motor is A clutch that transmits to the winding shaft to rotate the winding shaft, and interrupts transmission of rotation generated on the winding shaft side to prevent the rotation from being transmitted to the motor;
A worm gear housed in the clutch case and having its own shaft disposed parallel to the rotation shaft of the motor and detachably connected to the final spur gear of the motor gear portion; and coaxially with the winding shaft A clutch gear portion comprising a worm wheel that is disposed and meshes with the worm gear to transmit the rotational force of the worm gear to the clutch;
With
The final spur gear of the motor gear portion is pivotally supported by the worm gear independently of the gear housing.
A webbing take-up device characterized by that.

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