JP3171454U - Seat belt retractor, seat belt device and pawl - Google Patents

Abstract

Provided is a seat belt retractor in which operating noise reduction means can be easily arranged without requiring disassembly and assembly work of power transmission means. A seat belt retractor includes a spool that winds up a webbing W that restrains an occupant, a motor that generates a driving torque that rotates the spool, and a driving torque of the motor that is transmitted to the spool. A power transmission unit 4, a clutch 5 that restricts drawing of the webbing W, and a casing 6 that houses the clutch 5 and the power transmission unit 4 are provided. The clutch 5 is formed in a pawl 51 that is pivotally connected to the casing 6, a stopper portion 61 that is formed in the casing 6 to limit the rotation of the pawl 51, and a portion that contacts the stopper portion 61 of the pawl 51. Buffer part 52. [Selection] Figure 2

Description

  The present invention relates to a seat belt retractor, a seat belt device, and a pawl mounted on a vehicle such as an automobile, and more particularly, a seat belt retractor including a motor for winding a webbing, a seat belt device including the seat belt retractor, and the seat. The present invention relates to a pawl used for a belt retractor clutch.

  A vehicle such as an automobile is generally provided with a seat belt device that restrains the occupant on a seat that includes a seat portion on which the occupant is seated and a backrest portion that is positioned on the back of the occupant. Such a seat belt device includes a webbing that restrains an occupant, a seat belt retractor that winds the webbing, a guide anchor that is provided on the vehicle body side and guides the webbing, and a belt anchor that fixes the webbing to the vehicle body side. And a buckle disposed on a side surface of the seat and a tongue disposed on the webbing, and the passenger is restrained by fitting the tongue to the buckle. In such a seat belt device, one end of the webbing is fixed to the belt anchor, and the other end of the webbing is inserted into the guide anchor and connected to the seat belt retractor.

  Here, the seat belt retractor has a spool that winds up a webbing that restrains an occupant, and the spool is generally always urged in the winding direction by a spring. When the spring force of such a spring is tightened, there are problems such as high resistance when the webbing is pulled out and uncomfortable feeling when the seat belt is worn. On the other hand, if the elastic force of the spring spring is loosened, it becomes difficult to wind the pulled out webbing. In view of this, seat belt retractors equipped with a motor that assists in winding the webbing have already been proposed (see, for example, Patent Document 1 and Patent Document 2). In such a motor-equipped seat belt retractor, the motor may be controlled so as to send a signal to the occupant by pulling the webbing a plurality of times when the inter-vehicle distance is smaller than a certain distance.

  As described in Patent Document 1 and Patent Document 2, a motor-mounted seat belt retractor is generally provided with a clutch for switching between the case where the driving torque of the motor is transmitted to the spool and the case where it is not transmitted. In the invention described in Patent Document 2, the operation sound reducing means is arranged on the case side in order to suppress the generation of the contact sound generated when the clutch is switched.

Japanese Patent Laid-Open No. 2005-53422 JP 2008-280010 A

  However, when the operating noise reduction means is disposed on the case side as in the invention described in Patent Document 2 described above, it is necessary to replace the case itself when adding the operating noise reduction means to a ready-made product. The power transmission means having a plurality of gears has to be disassembled, and there is a problem that assembly work occurs again and takes time and effort. Similarly, when performing maintenance of the operating noise reduction means, there is a problem that the power transmission means needs to be disassembled and assembled.

  The present invention has been devised in view of the above-described problems, and a seat belt retractor, a seat belt device, and a pawl capable of easily arranging operating noise reduction means without requiring disassembly and assembly work of power transmission means. The purpose is to provide.

  According to the present invention, a spool that winds up a webbing that restrains an occupant, a motor that generates a driving torque for rotating the spool, a power transmission unit that transmits the driving torque of the motor to the spool, and the webbing A seat belt retractor comprising a clutch for restricting pulling of the clutch and a casing for housing the clutch and the power transmission means, wherein the clutch is rotatably connected to the casing via an initial spring and a pawl pin. A pawl that is formed in a convex shape on the casing and that restricts rotation by contacting the pawl, and a buffer portion that is formed at least in a portion that contacts the stopper portion of the pawl. A seat belt retractor is provided.

  In addition, according to the present invention, a webbing that restrains an occupant, a seat belt retractor that winds the webbing, a guide anchor that is provided on the vehicle body side and guides the webbing, and a belt that fixes the webbing to the vehicle body side A seat belt device having an anchor, a buckle disposed on a side surface of the seat, and a tongue disposed on the webbing, and restraining an occupant to the seat by the webbing by fitting the tongue to the buckle The seat belt retractor includes: a spool that winds up the webbing; a motor that generates a driving torque for rotating the spool; a power transmission unit that transmits the driving torque of the motor to the spool; A clutch for restricting the drawer, the clutch and the power And a casing for accommodating the attraction means, wherein the clutch is rotatably connected to the casing via an initial spring and a pawl pin, and is formed in a convex shape on the casing so as to contact the pawl. There is provided a seat belt device comprising: a stopper portion that restricts movement; and a buffer portion that is formed at least in a portion that contacts the stopper portion of the pawl.

  In the seat belt retractor and the seat belt device according to the present invention described above, the buffer portion is made of a material that is softer than a material constituting the stopper portion and can be used in an environment of −40 ° to 80 °. It is preferable that Moreover, the said buffer part may be comprised by adhere | attaching or mounting | wearing with the buffer member of another component, and may be comprised integrally by insert-molding, vapor-depositing, welding, or spraying the buffer member.

  The clutch has an operating pin that rotates the pawl in conjunction with the power transmission means, and the pawl is engaged with the operating pin and has a recess that forms an operating area of the operating pin. It may have a notch part through which the operating pin is sometimes inserted and a reinforcing part that reinforces the strength of the buffer part.

  According to the present invention, the spool for winding the webbing for restraining the occupant, the motor for generating the driving torque for rotating the spool, the power transmission means for transmitting the driving torque of the motor to the spool, In a pawl used for the clutch of a seat belt retractor comprising a clutch for restricting pulling out of the webbing and a casing for accommodating the clutch and the power transmission means, the pawl constitutes the seat belt retractor. There is provided a pawl characterized in that a buffer portion made of a material softer than a material constituting the other component is arranged at a portion in contact with the component.

  According to the seat belt retractor, the seat belt device, and the pawl according to the present invention described above, the operation noise reduction means is added to the ready-made product by arranging the buffer portion as the operation noise reduction means on the pawl side. However, it is only necessary to replace the pawl or connect the buffer to the pawl, it is not necessary to disassemble the power transmission means having a plurality of gears, and the operation noise reduction means can be easily added. Similarly, when exchanging or maintaining the operating noise reduction means, the operating noise reduction means can be easily arranged without requiring disassembly and assembly work of the power transmission means.

  In addition, by configuring the buffer portion with a material having excellent environmental resistance that reduces the contact noise, the contact sound can be effectively reduced, and even under severe use conditions such as automobiles, Damage and deterioration can be reduced.

  Further, when the buffer portion is constituted by a separate buffer member, the buffer portion can be easily formed by simply attaching or mounting the buffer member to the pawl. Further, when the buffer member is integrated with the buffer portion, the number of parts can be reduced, and the buffer portion can be formed only by arranging the pawl.

  Further, by forming the reinforcing portion on the pawl, it is possible to suppress a decrease in the strength of the pawl due to the arrangement of the buffer portion.

It is a principal block diagram which shows the seatbelt retractor which concerns on this invention, (A) is a components block diagram, (B) has shown the pawl enlarged view. It is operation | movement explanatory drawing of a clutch, (A) has shown the connection state, (B) has shown the cancellation | release state. FIG. 3 is an enlarged view of the pawl shown in FIG. 2, (A) shows a clutch connected state, and (B) shows a clutch released state. It is a figure which shows other embodiment of the pawl which concerns on this invention, (A) is 2nd embodiment, (B) is 3rd embodiment, (C) is 4th embodiment, (D) is 5th embodiment. (E) is the sixth embodiment, (F) is the seventh embodiment, and (G) is the eighth embodiment. It is a whole lineblock diagram showing the seat belt device concerning the present invention.

  Embodiments of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a main configuration diagram showing a seat belt retractor according to the present invention, in which (A) is a component configuration diagram and (B) is an enlarged view of a pawl. FIG. 2 is an explanatory diagram of the operation of the clutch, where (A) shows a connected state and (B) shows a released state. In FIG. 1, components such as a spool, a motor, and a power transmission unit that constitute the seat belt retractor are not shown.

  As shown in FIGS. 1 and 2, a seat belt retractor 1 according to the present invention includes a spool 2 that winds up a webbing W that restrains an occupant, a motor 3 that generates a driving torque that rotates the spool 2, and a motor. Power transmission means 4 for transmitting the driving torque 3 to the spool 2, a clutch 5 for restricting the withdrawal of the webbing W, and a casing 6 for housing the clutch 5 and the power transmission means 4. 6, a pawl 51 that is pivotally connected to the stopper 6, a stopper portion 61 that is formed in the casing 6 to limit the rotation of the pawl 51, and a buffer portion 52 that is formed in a portion that contacts the stopper portion 61 of the pawl 51, Have The present invention is characterized in that operating noise reduction means is arranged in the pawl 51 in order to suppress the generation of contact noise that occurs when the clutch 5 is switched.

  As shown in FIG. 1A, the pawl 51 is connected to the casing 6 via an initial spring 53 and a pawl pin 54. The initial spring 53 is a component for constantly urging the pawl 51 in the direction of the released state shown in FIG. Further, the pawl pin 54 is a component for locking the pawl 51 to the locking hole 62 of the casing 6 so as to be rotatable.

  As shown in FIG. 1B, the pawl 51 includes a pin locking portion 51a having a recess and a through hole for receiving the pawl pin 54, and a main body portion formed in a substantially rod shape in one direction from the pin locking portion 51a. 51b, a stop part 51c extending substantially parallel to the main body part 51b, and a locking part 51d extending in a substantially rotating direction of the main body part 51b.

  The pin locking portion 51a is formed in a substantially cylindrical shape, and a concave portion and a through hole for accommodating the pawl pin 54 are formed in the center portion. Further, the pin locking portion 51 a is connected so that the outer periphery thereof is along the mounting portion 63 formed inside the wall surface portion of the casing 6, and is disposed so as to be rotatable along the mounting portion 63.

  As shown in FIG. 2A, the main body 51 b is a portion that is locked to a ratchet 47 b that is connected to the spool 2. Moreover, the protrusion part 51e which protruded is formed in the surface facing the casing 6 of the main-body part 51b. The protrusion 51e is disposed in a groove 64 formed on the surface of the casing 6 that faces the pawl 51, and guides the pawl 51 so that it can rotate stably.

  The stop part 51c is a part that abuts against a stopper part 61 formed on the casing 6, and extends in a flat plate shape. Since the contact sound is generated by the contact between the stop portion 51c and the stopper portion 61, the buffer portion 52 is formed in the stop portion 51c.

  The buffer part 52 shown in FIG. 1 (B) is obtained by immersing the stop part 51c in a molten resin solution to gel the resin and forming a resin layer on the surface of the stop part 51c (so-called dip). Molding). Alternatively, a sack-shaped buffer member may be formed as a separate part using a mold having substantially the same shape as that of the stop portion 51c, and this buffer member may be bonded or attached to the stop portion 51c. The buffer portion 52 is made of a material that can be used in an environment of −40 ° to 80 ° while reducing contact noise generated when the pawl 51 (stop portion 51c) and the stopper portion 61 come into contact with each other. Is preferred. In order to reduce the contact noise, it is preferable that the buffer portion 52 is made of a material softer than the material constituting the stopper portion 61. In addition, the seat belt retractor 1 is disposed on a vehicle such as an automobile, and needs to be a material that can withstand an environmental resistance test, and can be used in an environment of −40 ° to 80 °. preferable. Specifically, a resin material such as a urethane-based resin is suitable, but a material such as ceramics, rubber, or a highly ductile metal may be used.

  As shown in FIGS. 2A and 2B, the locking portion 51 d is a portion that engages with an operation pin 55 that rotates the pawl 51 in conjunction with the power transmission means 4. The operating pin 55 is engaged with the engaging portion 51d, and the pawl 51 is rotated by the rotation of the operating pin 55. Further, an opening 51f is formed by the main body 51b, the stop 51c, and the locking part 51d, and one end of the operating pin 55 is inserted into the opening 51f. Further, a gap 51g is formed at the tip of the stop portion 51c and the locking portion 51d, and when the pawl 51 is first assembled to the casing 6, the operation pin 55 can be inserted later. . In addition, when assembling the operation pin 55 to the casing 6 first, you may comprise the shape where the front-end | tip part of the stop part 51c and the latching | locking part 51d was connected (shape without the clearance gap 51g).

  Before describing the operation of the clutch 5 having the pawl 51 described above, an outline of the overall configuration of the seat belt retractor 1 will be described with reference to FIGS. 2 (A) and 2 (B). The configuration of the pawl 51 other than the buffer portion 52 is basically the same as that of a conventional seat belt retractor, and is not limited to the illustrated configuration (for example, JP-A-2005-53422). Publication, Unexamined-Japanese-Patent No. 2008-280010 etc.).

  The spool 2 is a winding drum that winds up the webbing W. A casing 6 is disposed along the side surface of the spool 2, and the power transmission means 4 and the clutch 5 are accommodated in the casing 6. In FIG. 2, only the inner casing of the casing 6 is shown, and the outer casing is not shown.

  The power transmission means 4 is a gear train that transmits the power of the motor 3 to the spool 2. A drive gear 31 is connected to the drive shaft of the motor 3. A first intermediate gear 41, a second intermediate gear 42, and a third intermediate gear 43 are connected to the drive gear 31 so as to mesh with each other in this order. The first intermediate gear 41, the second intermediate gear 42, and the third intermediate gear 43 are rotatably connected to the casing 6. The third intermediate gear 43 is provided with a fourth intermediate gear 44 that rotates in conjunction with the same axis.

  The fourth intermediate gear 44 is configured to mesh with the outer teeth 45 a of the sun gear member 45 having the outer teeth 45 a and transmit power to the sun gear member 45. The sun gear member 45 has a drive shaft that is coaxial with the outer teeth 45a and protrudes toward the casing 6 at the center thereof. Inner teeth 45b of the sun gear member 45 are formed on the outer periphery of the drive shaft. It constitutes a sun gear. A planetary gear 46 is disposed on the outer periphery of the inner teeth 45b. On the outer periphery of the planetary gear 46, an internal gear 47 provided with internal teeth 47a that mesh with the planetary gears 46 is disposed. The ratchet 47 b described above is formed on the outer periphery of the internal gear 47. The planetary gear 46 is connected to the carrier 48 via a reduction plate (not shown) and a reduction pin (not shown) so as to be able to revolve and rotate around the sun gear (inner teeth 45b). The mechanism is configured. The carrier 48 is connected to the rotating shaft of the spool 2 and is configured so that power can be finally transmitted to the spool 2. Although not shown, a spring (not shown) for urging the spool 2 in the winding direction is disposed outside the casing 6 (outer casing).

  In addition to the pawl 51, the stopper portion 61, and the ratchet 47b, the clutch 5 includes an operation pin 55 that rotates the pawl 51 in conjunction with the power transmission unit 4. The operating pin 55 has a semi-annular portion whose one end is wound around the axis of the third intermediate gear 43, and has a hook-shaped portion whose other end is caught by the locking portion 51 d of the pawl 51. Since the operating pin 55 is attached to the axial center of the third intermediate gear 43 by the elastic force of the semi-annular portion, it rotates in conjunction with the third intermediate gear 43 when the load applied to the operating pin 55 is low. When a certain load is applied, only the third intermediate gear 43 rotates. Therefore, by controlling the rotation direction of the third intermediate gear 43, the rotation direction of the operating pin 55 can be controlled, and finally the rotation direction of the pawl 51 can be controlled.

  For example, as shown in FIG. 2A, in order to put the clutch 5 into the connected state, the motor 3 is driven and the drive gear 31 is rotated counterclockwise in the figure, so that the first intermediate gear 41 is shown in FIG. The second intermediate gear 42 rotates counterclockwise in the figure, and the third intermediate gear 43 rotates clockwise in the figure. Accordingly, the operating pin 55 is rotated clockwise in the figure, the pawl 51 is rotated counterclockwise in the figure, and the main body 51b of the pawl 51 is engaged with the ratchet 47b, and the ratchet 47b is rotated clockwise in the figure. It cannot be rotated. Since the ratchet 47b is connected to the rotation shaft of the spool 2, the spool 2 cannot rotate clockwise in the figure. That is, the webbing W wound around the spool 2 cannot be pulled out.

  On the other hand, as shown in FIG. 2 (B), in order to put the clutch 5 in the released state, when the motor 3 is driven and the drive gear 31 is rotated in the clockwise direction in the figure, the first intermediate gear 41 is shown in the figure. The second intermediate gear 42 rotates counterclockwise, the second intermediate gear 42 rotates clockwise in the figure, and the third intermediate gear 43 rotates counterclockwise in the figure. Therefore, the operating pin 55 is rotated counterclockwise in the figure, the pawl 51 is rotated clockwise in the figure, and the main body 51b of the pawl 51 is separated from the ratchet 47b, and the ratchet 47b is rotated clockwise in the figure. Can be rotated. Accordingly, the spool 2 can also rotate in the clockwise direction in the figure, and the webbing W can be pulled out freely.

  Here, FIG. 3 is an enlarged view of the pawl shown in FIG. 2, (A) shows the clutch engaged state, and (B) shows the clutch disengaged state. In each figure, for convenience of explanation, illustrations of the power transmission means 4, the ratchet 47b, the operating pin 55, etc. are omitted.

  As shown in FIG. 3A, the pawl 51 is disposed at a position spaced from the convex stopper portion 61 formed on the casing 6 in the engaged state of the clutch 5, and the stop portion 51 c is also separated from the stopper portion 61. It is separated. In the released state of the clutch 5, as shown in FIG. 3B, the pawl 51 is rotated around the pawl pin 54, and the stop portion 51 c comes into contact with the stopper portion 61. At this time, when the stop portion 51c and the stopper portion 61 are metal parts or a resin molded product with high hardness, a contact sound is generated, which causes discomfort to the occupant. Therefore, in the present invention, the buffer portion 52 is formed in a portion (stop portion 51c) that contacts the stopper portion 61 of the pawl 51. As described above, the buffer 52 is made of a material that reduces contact noise and has excellent environmental resistance.

  As described above, the buffer portion 52 that is the operation sound reduction means is arranged on the pawl 51 side, so that even when the operation sound reduction means is added to the ready-made product, the replacement of the pawl 51 or the buffer portion 52 on the pawl 51. The power transmission means 4 having a plurality of gears need not be disassembled, and the operation noise reduction means can be easily added. Similarly, when exchanging the operation noise reduction means or performing maintenance, the operation noise reduction means can be arranged without requiring the power transmission means 4 to be disassembled and assembled. Further, by configuring the buffer portion 52 with a material excellent in environmental resistance that reduces the contact noise, the contact noise can be effectively reduced, and the buffer portion can be used even under severe use conditions such as an automobile. The damage and deterioration of 52 can be reduced.

  Next, another embodiment of the pawl 51 according to the present invention will be described. Here, FIG. 4 is a figure which shows other embodiment of the pawl which concerns on this invention, (A) is 2nd embodiment, (B) is 3rd embodiment, (C) is 4th embodiment, (D) is the fifth embodiment, (E) is the sixth embodiment, (F) is the seventh embodiment, and (G) is the eighth embodiment. In addition, the same code | symbol is attached | subjected about the same component as embodiment shown in FIG.1 (B), and the overlapping description is abbreviate | omitted.

  In the second embodiment of the pawl 51 shown in FIG. 4A, the buffer portion 52 is insert-molded. Specifically, the buffer portion 52 may be integrally formed by forming a recess in the stop portion 51c, setting it in a mold, and then pouring and melting the molten resin. In FIG. 4A, a cross-sectional view in which a part of the stop portion 51c is cut out is illustrated.

  In the third embodiment of the pawl 51 shown in FIG. 4B, the buffer portion 52 is formed only on the surface of the stop portion 51c that contacts the stopper portion 61. Specifically, a resin molded product formed into a thin plate shape is adhered with an adhesive, or a thin film made of a material such as resin, ceramics, or metal is formed on one surface of the stop portion 51c by means such as vapor deposition, welding, or thermal spraying. It may be formed.

  In the fourth embodiment of the pawl 51 shown in FIG. 4C, a buffer portion 52 is formed on a part of the surface of the stop portion 51c that comes into contact with the stopper portion 61. Specifically, a plurality of resin molded products formed in a linear shape are bonded with an adhesive, or a thin plate-shaped resin molded product formed with irregularities and multiple holes is bonded with an adhesive, or vapor deposition is performed in a masked state. A thin film made of a material such as resin, ceramics, or metal may be partially formed on one surface of the stop portion 51c by means such as welding or spraying. Moreover, you may make it form an unevenness | corrugation in the surface which contacts the stopper part 61 of the buffer part 52 dip-molded or insert-molded.

  In the fifth embodiment of the pawl 51 shown in FIG. 4D, the stop portion 51c is configured by a plate spring 56 made of resin or metal, and the stop portion 51c itself is used as a buffer portion 52. The leaf spring 56 is attached and fixed to a groove 51h formed in the pawl 51, for example. Moreover, the part which contacts the stopper part 61 may be formed in a wave shape, and you may make it open a some hole.

  In the sixth embodiment of the pawl 51 shown in FIG. 4 (E), a buffer portion 52 is also formed in the portion of the main body 51b of the pawl 51 shown in FIG. 1 (B) that contacts the ratchet 47b. With this configuration, it is possible to reduce the contact sound when the pawl 51 comes into contact with the ratchet 47b. Moreover, you may apply 2nd embodiment-5th embodiment mentioned above with respect to the buffer part 52 formed in the main-body part 51b.

  The seventh embodiment of the pawl 51 shown in FIG. 4 (F) reduces the contact sound generated when the pawl 51 and the stopper portion 61 come into contact with the entire pawl 51 and has an environment of −40 ° to 80 °. The pawl 51 is entirely formed as a buffer portion 52. According to such a configuration, the pawl 51 can be easily formed simply by pouring molten resin or metal into a mold and solidifying the mold. In addition, since the entire pawl 51 is made of a material that reduces the contact noise, the contact noise can be reduced in all of the portions that make contact with the other components constituting the seat belt retractor 1.

  The eighth embodiment of the pawl 51 shown in FIG. 4 (G) includes a recess 51i that engages with the operating pin 55 and forms an operating region of the operating pin 55, and a notch 51j through which the operating pin 55 is inserted during assembly. And a reinforcing portion 57 that reinforces the strength of the buffer portion 52. Specifically, the reinforcing member 57 is formed by connecting or integrally forming a plate-like member to the opening 51f formed by the main body 51b, the stop 51c and the locking part 51d. Further, a cutout 51j is formed on the plate-like member constituting the reinforcing portion 57 on an extension line of the gap 51g between the stop portion 51c and the locking portion 51d. The eighth embodiment suppresses a decrease in strength of the pawl 51 or the stop portion 51c due to the formation of the buffer portion 52 in the pawl 51. In particular, as in the seventh embodiment shown in FIG. In addition, it is optimal when the entire pawl 51 is formed of resin or the like. In the eighth embodiment shown in FIG. 4G, a reinforcing portion 57 is formed on the pawl 51 of the seventh embodiment shown in FIG. 4F, and is shown in FIG. The back side of the pawl 51 is illustrated.

  Finally, the seat belt device 7 according to the present invention will be described. Here, FIG. 5 is an overall configuration diagram showing the seat belt device according to the present invention. In addition, about the same component as embodiment shown in FIGS. 1-3, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The seat belt device 7 of the present invention shown in FIG. 5 includes a webbing W that restrains an occupant, a seat belt retractor 1 that winds the webbing W, a guide anchor 71 that is provided on the vehicle body side and guides the webbing W, By having a belt anchor 72 for fixing the webbing W to the vehicle body side, a buckle 73 disposed on the side surface of the seat S, and a tongue 74 disposed on the webbing W, by fitting the tongue 74 to the buckle 73 A seat belt device 7 for restraining an occupant to a seat S by a webbing W, wherein the seat belt retractor 1 includes a spool 2 for winding the webbing W, a motor 3 for generating a driving torque for rotating the spool 2, and a motor Power transmission means 4 for transmitting the driving torque 3 to the spool 2 and a clutch for restricting the pulling of the webbing W. And a casing 6 that accommodates the clutch 5 and the power transmission means 4, and the clutch 5 is connected to the casing 6 so as to be rotatable, and the rotation of the pawl 51 is formed in the casing 6. And a buffer portion 52 formed at least in a portion in contact with the stopper portion 61 of the pawl 51.

  The seat belt device 7 according to the present invention is obtained by applying the pawl 51 and the seat belt retractor 1 according to the present invention described above to a so-called normal seat belt device. Therefore, according to this invention, the seatbelt apparatus 7 which reduced the operating sound of the clutch 5 is provided.

  The seat S includes, for example, a seat portion S1 on which an occupant sits, a backrest portion S2 located on the back of the occupant, and a headrest portion S3 that supports the occupant's head. The seat belt retractor 1 is built in, for example, the B pillar 75 of the vehicle body. In general, the buckle 73 is often disposed on the side surface of the seat portion S1, and the belt anchor 72 is often disposed on the lower surface of the seat portion S2. Further, the guide anchor 71 is often disposed on the B pillar 75 of the vehicle body. The webbing W has one end connected to the belt anchor 72 and the other end connected to the seat belt retractor 1 via the guide anchor 71.

  Therefore, when the tongue 74 is fitted to the buckle 73, the webbing W is pulled out from the seat belt retractor 1 while sliding through the insertion hole of the guide anchor 71. When the occupant wears the seat belt or releases the seat belt when getting off the vehicle, the webbing W is wound up to a certain load by the action of the spring 11 of the seat belt retractor 1 and the motor 3.

  Here, when the webbing W is taken up by the motor 3, as shown in FIG. 2A, the motor 3 is driven to rotate the drive gear 31 counterclockwise in the drawing, and the power transmission means 4 (first The sun gear member 45 is rotated counterclockwise in the figure by the action of the first intermediate gear 41 to the fourth intermediate gear 44), and the external teeth 45a are rotated counterclockwise in the figure. At this time, each planetary gear 46 tries to rotate clockwise in the figure, and tries to rotate the internal gear 47 clockwise in the figure. However, as shown in FIG. 2A, by driving the motor 3, the pawl 51 is rotated counterclockwise in the figure, the main body 51b of the pawl 51 is engaged with the ratchet 47b, and the clutch 5 is connected. Therefore, the internal gear 47 cannot rotate clockwise in the figure. Accordingly, each planetary gear 46 revolves around the outer teeth 45a counterclockwise in the figure. Since the rotation shaft of the spool 2 is connected to the planetary gear 46 via the carrier 48, the spool 2 rotates counterclockwise in the drawing in conjunction with the revolution of the planetary gear 46, and the webbing W can be taken up. it can.

  Thereafter, when a constant tension is applied to the webbing W or when the webbing W is wound up by a certain amount, the clutch 5 is released and the winding of the webbing W is stopped. When stopping the winding of the webbing W by the motor 3, as shown in FIG. 2B, the motor 3 may be driven to rotate the drive gear 31 clockwise in the drawing. With this operation, the pawl 51 can be rotated clockwise through the power transmission means 4 and the clutch 5 can be released.

  Further, when the inter-vehicle distance of the vehicle becomes narrow, the motor 3 may be controlled to send a signal to the occupant by repeatedly pulling the webbing W. Also in this case, the clutch 5 is connected and released by the same operation as when the webbing W is wound by the motor 3 and when the winding of the webbing W is stopped. Specifically, as shown in FIGS. 2A and 2B, by driving the motor 3, the drive gear 31 is alternately rotated counterclockwise and clockwise in the figure, and the clutch 5 is connected. The webbing W is wound up and the webbing W is drawn out alternately. As a result, the webbing W can be pulled with respect to the occupant wearing the seat belt, and the webbing W is pulled out by the tension generated in the webbing W. By repeating this operation, a signal is sent to the occupant. Can send.

  As described above, when the clutch 5 is connected and released, according to the seat belt device 7 of the present invention, since the buffer portion 52 is formed in the pawl 51, the contact noise generated when the clutch 5 is released is reduced. It is possible to reduce discomfort given to the occupant. Further, the buffer portion 52 can be easily disposed in the existing seat belt device 7 only by replacing the pawl 51 of the seat belt retractor 1.

  The present invention is not limited to the above-described embodiment, and the present invention may be applied to the seat belt retractor 1 without the spring spring 11, may be applied to a seat belt device used for a vehicle other than a vehicle, etc. Of course, various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Seat belt retractor 2 ... Spool 3 ... Motor 4 ... Power transmission means 5 ... Clutch 6 ... Casing 7 ... Seat belt apparatus 11 ... Spring spring 31 ... Drive gear 41 ... First intermediate gear 42 ... Second intermediate gear 43 ... Third Intermediate gear 44 ... Fourth intermediate gear 45 ... Sun gear member 45a ... External gear 45b ... Internal gear 46 ... Planetary gear 47 ... Internal gear 47a ... Internal gear 47b ... Ratchet 48 ... Carrier 51 ... Paul 51a ... Pin locking part 51b ... Main body Part 51c ... Stop part 51d ... Locking part 51e ... Projection part 51f ... Opening part 51g ... Gap 51h ... Groove part 51i ... Recessed part 51j ... Notch part 52 ... Buffer part 53 ... Initial spring 54 ... Paul pin 55 ... Actuation pin 56 ... Plate spring 57 ... Reinforcing part 61 ... Stopper part 62 ... Locking hole 63 ... Mounting part 64 ... Groove part 71 ... Guide anchor 72 ... Belt Anchor 73 ... buckle 74 ... tongs 75 ... B-pillar

Claims (6)

A spool that winds up a webbing that restrains an occupant, a motor that generates a driving torque for rotating the spool, a power transmission unit that transmits the driving torque of the motor to the spool, and a clutch that restricts the withdrawal of the webbing A seat belt retractor comprising: a casing that houses the clutch and the power transmission means;
The clutch includes a pawl rotatably connected to the casing via an initial spring and a pawl pin, a stopper portion formed in a convex shape on the casing and contacting the pawl to limit the rotation, and at least the pawl And a buffer portion formed at a portion in contact with the stopper portion.   The said buffer part is a material softer than the material which comprises the said stopper part, Comprising: It is comprised by the raw material which can be used in an environment of -40 degrees-80 degrees, It is characterized by the above-mentioned. Seat belt retractor.   The said buffer part is comprised by adhere | attaching or mounting | wearing with the buffer member of another component, or is comprised integrally by insert-molding, vapor deposition, welding, or spraying a buffer member. The seat belt retractor described in 1.   The clutch has an operating pin that rotates the pawl in conjunction with the power transmission means, and the pawl engages with the operating pin and forms an operating area of the operating pin, and when assembled, the clutch A seat belt retractor comprising: a notch portion through which an operating pin is inserted; and a reinforcing portion that reinforces the strength of the buffer portion. A webbing that restrains an occupant, a seat belt retractor that winds the webbing, a guide anchor that is provided on the vehicle body side to guide the webbing, a belt anchor that fixes the webbing to the vehicle body side, and a side surface of the seat In a seat belt device that has a buckle disposed and a tongue disposed on the webbing, and restrains an occupant to the seat by the webbing by fitting the tongue to the buckle.
The seatbelt retractor according to any one of claims 1 to 4, wherein the seatbelt retractor is the seatbelt retractor. A spool that winds up a webbing that restrains an occupant, a motor that generates a driving torque for rotating the spool, a power transmission unit that transmits the driving torque of the motor to the spool, and a clutch that restricts the withdrawal of the webbing And a pawl used for the clutch of a seat belt retractor comprising the clutch and a casing for accommodating the power transmission means,
The pawl is characterized in that a buffer portion formed of a material softer than a material constituting the other part is disposed in a portion where the pawl comes into contact with another part constituting the seat belt retractor.