WO2000048869A1 - Enrouleur de ceinture de securite - Google Patents
Enrouleur de ceinture de securite Download PDFInfo
- Publication number
- WO2000048869A1 WO2000048869A1 PCT/JP1999/006779 JP9906779W WO0048869A1 WO 2000048869 A1 WO2000048869 A1 WO 2000048869A1 JP 9906779 W JP9906779 W JP 9906779W WO 0048869 A1 WO0048869 A1 WO 0048869A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shaft
- webbing
- lock
- gear
- rotation
- Prior art date
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
- B60R22/4676—Reels with means to tension the belt in an emergency by forced winding up comprising energy-absorbing means operating between belt reel and retractor frame
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
- B60R22/405—Belt retractors, e.g. reels self-locking in an emergency responsive to belt movement and vehicle movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
- B60R22/4619—Transmission of tensioning power by cable, e.g. using a clutch on reel side
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
- B60R22/4628—Reels with means to tension the belt in an emergency by forced winding up characterised by fluid actuators, e.g. pyrotechnic gas generators
- B60R22/4633—Linear actuators, e.g. comprising a piston moving along reel axis and rotating along its own axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/28—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices
- B60R2022/286—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material
- B60R2022/287—Safety belts or body harnesses in vehicles incorporating energy-absorbing devices using deformation of material of torsion rods or tubes
Definitions
- a webbing take-up device which constitutes a main part of a so-called sheet belt device that restrains a vehicle occupant by a long belt-shaped webbing belt, basically includes a webbing shaft on which one end of the webbing belt is locked.
- the frame is configured by a biasing means such as a spiral coil spring for biasing the winding shaft in the winding direction for winding the webbing belt.
- the normal webbing take-up device moves to the front side of the vehicle due to inertia in the rapid deceleration state by locking the take-up shaft when the vehicle enters the rapid deceleration state.
- a locking device that improves the restraining force of the webbing belt when the vehicle suddenly decelerates against the force of the body of the occupant trying to pull out the webbing belt, and forcibly reduces the rotational force in the winding direction when the vehicle suddenly decelerates.
- a pretensioner provided to the winding shaft.
- the conventional webbing take-up device as described above has a problem that the number of parts used is large and the whole becomes large. The factors that cause this problem will be described below in terms of both the above-mentioned licking device and pretensioner.
- the locking device is usually provided with a substantially circular V gear having ratchet teeth formed on the outer periphery.
- the V gear is mechanically connected to the winding shaft via a torsion spring or the like, and rotates following the winding shaft.
- a pair of lock plates is engaged and held along the V gear and the take-up shaft.
- Ratchet teeth are formed on each lock plate, and when the lock plate moves outward in the radial direction of rotation of the winding shaft, a ratchet hole is formed in one of the pair of leg plates constituting the frame. Suitable for teeth.
- An acceleration sensor with an inertia ball is arranged on the outside (usually lower side) in the radial direction of the V gear, and the inertia ball rolls when the vehicle suddenly decelerates, causing the acceleration sensor to engage.
- the pawl engages the ratchet teeth of the V gear and limits the rotation of the V gear. That is, in the vehicle sudden deceleration state, the occupant's body tries to move in the traveling direction of the vehicle due to inertia, and at this time, the occupant's body pulls out the webbing belt to rotate the winding shaft, and the V gear is engaged.
- Locking to the dowel causes relative rotation between the take-up shaft and the V gear, causing each lock plate to move outward in the radius of rotation of the take-up shaft, causing the ratchet teeth of each lock plate to engage with the ratchet holes. Limit rotation of the take-up shaft in combination with the internal teeth.
- the pretensioner includes a pinion connected to one end of a take-up shaft via a one-way clutch, and a rack bar that can be coupled to the pinion.
- the rack bar is formed integrally with the piston housed in the cylinder, moves in accordance with an increase in the internal pressure of the cylinder, engages with the pinion, and forcibly rotates the winding shaft in the winding direction via a one-way clutch.
- a gas generator power is attached to the cylinder, and when an acceleration sensor different from the acceleration sensor of the lock device described above detects a sudden deceleration state of the vehicle, it ignites the gas generating agent in the gas generator and instantaneously. Gas is generated and the piston is moved by this gas pressure.
- the shaft portion on the winding shaft side of the above-described pinion or the shaft portion on the pinion side of the one-way clutch is generally rotatably supported by a bearing portion provided in a housing formed of a metal plate or the like.
- the bearing portion is in surface contact with the outer peripheral surface of the shaft portion along the outer peripheral direction. For this reason, for example, when the rack bar is engaged with the pinion, the winding shaft is eccentric, and when the winding shaft is rotated in this state, the winding shaft is pressed against the inner peripheral portion of the bearing portion.
- the frictional resistance increases, Due to the frictional resistance, the force by which the pretensioner forcibly rotates the winding shaft via the rack bar and the pinion is converted into heat energy, and the contribution of the winding shaft to rotation is reduced.
- the bearing is made of a synthetic resin material or the like having a lower rigidity than the metal material of the winding shaft in order to reduce the weight, the inner circumference of the bearing will be reduced by the frictional resistance described above.
- the part is plastically deformed, and the inner peripheral surface of the bearing part becomes rough, further increasing the frictional resistance.
- An object of the present invention is to provide a webbing take-up device that is inexpensive by reducing the size of a pretensioner and a lock device and reducing the number of components in consideration of the above facts.
- the present invention has a cylindrical take-up shaft in which one end of a webbing belt is locked, and a pull-out direction in which the webbing belt is pulled out when the vehicle is rapidly decelerated. And a pre-tensioner for forcibly rotating the take-up shaft in a take-up direction opposite to the pull-out direction in the vehicle sudden deceleration state.
- a winding device comprising: a frame having a pair of leg plates in which a ratchet hole whose inner peripheral portion is formed as a ratchet tooth of an internal tooth is formed in a negative direction, and which is opposed to each other along an axial direction of the winding shaft.
- a lock base provided near the one leg plate so as to be coaxial and rotatable relative to the winding shaft; and external teeth that can be fitted to the ratchet teeth, and are held substantially integrally with the lock base.
- the other end of the take-up shaft is connected to the lock base, and the take-up shaft and the lock base are rotated integrally with each other.
- a torsion shaft that allows relative rotation of the take-up shaft with respect to the lock base is formed, and a push nut portion to which a tip end of the torsion shaft is locked is formed.
- a hook portion to be locked is formed, an outer peripheral flange portion overlapping the frame is formed, the one leg plate is sandwiched between one end portion of the winding shaft, and the lock base and the mouth plate And a lock cover that covers the pair of leg plates, and is provided coaxially with the winding shaft on a side of the other leg plate of the pair of leg plates.
- a predetermined gap is provided between the outer peripheral portion of the shaft portion and the outer peripheral portion of the shaft portion, the outer peripheral portion of the shaft portion being opposed to the outer peripheral portion of the shaft portion provided coaxially with the pinion on the shaft side.
- a bearing portion having an interposed inner peripheral portion; and an inner peripheral portion of the bearing portion and an outer peripheral portion of the shaft portion, which are formed so as to protrude toward a higher rigidity portion with a lower rigidity force and have a higher rigidity.
- a plurality of protruding portions that are in contact with each other, and the pretensioner is configured to further include: a detection portion that detects a change in acceleration in the vehicle sudden deceleration state and a lock plate that detects a change in acceleration. Outside And an urging means provided on the side of the other leg plate of the frame, for urging the winding shaft in a rotating direction for winding the webbing belt.
- the pinion and the rack bar are covered with the pinion and the rack bar from the side opposite to the other leg plate.
- a bearing hole for supporting the pinion is formed, and a stopper that opposes the rack bar on the side of the piston in the pushing direction where the internal pressure of the cylinder rises;
- the pretensioner is configured to include a cover in which a restriction portion is formed on the side opposite to the pinion, and, of the cover, the periphery of the bearing hole, the stopper, and the restriction portion are formed of metal.
- the remaining part of the cover was formed of a synthetic resin material. It is characterized by.
- the protruding portion is formed on the bearing portion, and the rack bar is pressed against the pinion in the bearing portion.
- the protrusion is formed more in the vicinity of the portion facing the shaft portion than in the other portion along the axis.
- a portion of the inner peripheral portion of the bearing portion and the outer peripheral portion of the shaft portion on which the protruding portion is not formed is provided.
- the protruding portions are in line contact with each other.
- the webbing retractor is provided so as to be coaxially rotatable with respect to the lock base while being engaged with the lock plate.
- the locking device is configured to include a V gear for displacing the relock plate by the relative rotation to couple the external teeth to the ratchet teeth, and the inertial mass body to be moved by a change in acceleration in the vehicle sudden deceleration state. And a regulating member that is displaced in conjunction with the movement of the inertial mass body and engages with the V gear by the displacement to regulate the rotation of the V gear, thereby constituting the acceleration sensor.
- one end is directly or indirectly locked to the winding shaft, and the other is directly or indirectly connected to the other leg plate of the frame.
- the other end is locked, and the spiral coil spring for urging the winding shaft in a rotational direction for winding the webbing belt by rotating the other end with respect to the one end in a direction in which the number of windings is increased. It is characterized by that.
- the projecting portion is formed on the bearing portion, and the rack is located on a side opposite to the rack bar via the pinion.
- the projection is formed on the inner peripheral portion of the bearing portion on the side facing the outer peripheral portion of the shaft portion along the direction of the mating surface between the bar and the pinion.
- the protruding portion of the inner peripheral portion of the bearing portion and the outer peripheral portion of the shaft portion is not formed. V, the protrusion is brought into line contact with the side.
- the webbing take-up device in the webbing take-up device according to the eighth aspect, is provided so as to be coaxially rotatable with respect to the lock base while being engaged with the front plate.
- the lock device is configured to include a V gear that displaces a lock plate by the relative rotation to engage the external teeth with the ratchet teeth, and the inertial mass body that moves by a change in acceleration in the vehicle sudden deceleration state. And a regulating member that is displaced in conjunction with the movement of the inertial mass body and engages with the V gear by the displacement to regulate the rotation of the V gear, thereby constituting the acceleration sensor.
- the one end is directly or indirectly locked to the winding shaft, and the one end is directly connected to the other leg plate of the frame.
- a spiral coil for urging the winding shaft in a rotational direction for winding the webbing belt by rotating the other end with respect to the one end in a direction in which the other end is indirectly locked and the number of windings is increased. It is characterized in that a spring is used as the urging means.
- the present invention according to claim 11 is the webbing take-up device according to claim 1, wherein the projecting portion is formed on the bearing portion, and the rack bar is pressed against the pinion in the bearing portion. It is characterized in that the protruding portion is formed more in the vicinity of the portion facing the shaft portion in the direction than in other portions.
- the present invention according to claim 12 is the webbing take-up device according to claim 11, wherein the protruding portion of the inner peripheral portion of the bearing portion and the outer peripheral portion of the shaft portion is not formed. The protrusion is brought into line contact with the side.
- the webbing take-up device in the webbing take-up device according to the thirteenth aspect, is provided so as to be coaxially rotatable relative to the lock base while being engaged with the lock plate.
- the locking device is configured to include a V gear for displacing the relock plate by the relative rotation to couple the external teeth to the ratchet teeth, and to move by a change in acceleration in the vehicle rapid deceleration state.
- the acceleration sensor includes: an inertial mass body; and a regulating member that is displaced in conjunction with the movement of the inertial mass body, and that regulates the rotation of the V gear by engaging the V gear with the displacement. It is characterized by having achieved.
- the present invention according to claim 14 is the webbing take-up device according to claim 13, wherein one end is directly or indirectly locked to the jtr take-up shaft, and the other leg plate of the frame is provided. The other end is locked directly or indirectly, and the other end rotates in the direction in which the number of windings is increased, and the spiral rotates to wind the webbing belt in a rotating direction for winding the webbing belt.
- a coil spring is used as the urging means.
- the protruding portion is formed on an inner peripheral portion of the bearing portion on the side of the bearing.
- the protruding portion of the inner peripheral portion of the bearing portion and the outer peripheral portion of the shaft portion is not formed.
- the protrusion is brought into line contact with the side.
- the webbing retractor is coaxially rotatable relative to the lock base in a state where the lock base is engaged with the lock base.
- a locking device including a V gear for displacing the relock plate by the relative rotation to couple the external teeth to the ratchet teeth, and moves by a change in acceleration in the vehicle sudden deceleration state.
- the acceleration sensor includes: an inertial mass body; and a regulating member that is displaced in conjunction with the movement of the inertial mass body, and that regulates the rotation of the V gear by engaging the V gear with the displacement. It is characterized by doing.
- the present invention according to claim 18 is the webbing take-up device according to claim 17, wherein one end is directly or indirectly locked to the take-up shaft and the other leg plate of the frame is connected to the other leg plate of the frame.
- a spiral coil spring that directly or indirectly locks the other end and urges the winding shaft in a direction of winding the webbing belt by rotating the other end with respect to the one end in a direction in which the number of windings is increased. Is the urging means.
- the present invention according to claim 19 is the webbing take-up device according to claim 1, wherein the protruding portion of the inner peripheral portion of the bearing portion and the outer peripheral portion of the shaft portion is not formed. The protruding portion is brought into line contact with ⁇ .
- the webbing take-up device in the webbing take-up device according to the nineteenth aspect, is provided so as to be coaxially rotatable with respect to the lock base while being engaged with the lock plate.
- the inertia mass body which includes a V gear that displaces the lock plate by the relative rotation to engage the external teeth with the ratchet teeth, and that moves due to a change in acceleration in the vehicle rapid deceleration state.
- a regulating member that is displaced in conjunction with the movement of the inertial mass body and that regulates the rotation of the V gear in relation to the V gear by the displacement; and wherein the acceleration sensor is configured.
- one end is directly or indirectly locked to the take-up shaft, and the other end plate of the frame is connected to the other leg plate of the frame.
- the other end is directly or indirectly locked, and the spiral coil spring for urging the winding shaft in a rotating direction for winding the webbing belt by rotating the other end with respect to the one end in a direction in which the number of windings is increased. It is characterized in that said urging means is used.
- the webbing take-up device in the webbing take-up device according to the first aspect, is provided so as to be coaxially rotatable with respect to the lock base while being engaged with the lock plate.
- the locking device is configured to include a V gear that displaces the lock plate by the relative rotation to engage the external teeth with the ratchet teeth, and the inertial mass body that moves due to a change in acceleration in the vehicle rapid deceleration state. And a regulating member that is displaced in conjunction with the movement of the inertial mass body, and engages with the V gear by the displacement to regulate the rotation of the V gear, thereby constituting the acceleration sensor.
- one end is directly or indirectly locked to the winding shaft, and the other end plate of the frame is connected to the other leg plate of the frame.
- the other end is directly or indirectly locked, and the rotation method of winding the webbing belt by rotating the other end relative to the one end in a direction in which the number of windings is increased.
- a spiral coil spring for urging the winding shaft in the direction is used as the urging means.
- one end of the webbing is directly or indirectly locked to the winding shaft, and the one end is directly connected to another leg plate of the frame.
- the spiral coil spring for urging the winding shaft in a direction in which the webbing belt is wound by rotating the other end with respect to the one end in a direction in which the other end is indirectly locked and the number of windings is increased. It is characterized by a biasing means.
- the take-up shaft and the lock base are connected via the torsion shaft, and the take-up shaft takes up the webbing belt by the urging force of the urging means. It is urged in the take direction.
- the webbing belt can be pulled out by rotating the take-up shaft, the lock base, and the toys shaft integrally in the pull-out direction opposite to the winding direction against the biasing force.
- the acceleration sensor force S when the vehicle suddenly decelerates, the change in acceleration (deceleration) at this time is detected by the acceleration sensor force S, and the locking device is activated.
- the acceleration sensor detects a change in acceleration (deceleration) during rapid deceleration of the vehicle, the acceleration sensor matches the external teeth of the lock plate with the internal teeth of the ratchet teeth formed on one leg plate of the frame. . This prevents the lock base from rotating in the pull-out direction.
- the webbing pulling force acts on the toys shaft through the winding shaft as a rotational force in the pulling-out direction, whereby the toss shaft is twisted, and the winding shaft moves in the webbing withdrawing direction with respect to the lock base. The webbing is rotated to draw out the webbing, and energy is absorbed.
- the tip of the torsional shaft is locked to the push nut of the lock cover, so that the tossing of the torsional shaft is prevented.
- the lock base is locked to the lock base by the hook portion, the lock plate held by the lock base is substantially covered by the lock cover, and the lock plate Floating is prevented.
- the outer peripheral flange of the lock cover overlaps with the frame, dust and the like enter the mechanism. Is also prevented.
- the lip base and the lip plate are covered with the frame sandwiched between the lock cover and the take-up shaft, the lock base and the lock plate, the take-up shaft, and the tip of the torsion shaft are covered.
- the shaft portion which is composed of a portion, is also prevented from falling off the frame.
- the webbing take-up device can prevent the lock plate from rising to prevent rotation in the webbing pull-out direction, and can absorb energy when stopping webbing from being pulled out. Prevention of the one-piece shaft from coming off can be realized by providing a single lock cover, so that the number of parts is reduced and no special parts processing is required. Furthermore, it is also possible to prevent dust and the like from entering the inside of the mechanism.
- the pretensioner operates in the above-described vehicle rapid deceleration state. That is, when the vehicle suddenly decelerates, the gas generator operates to supply gas between the piston and the bottom of the cylinder, and the gas pressure increases the internal pressure of the cylinder and pushes out the piston.
- the rack bar integrated with the piston is connected to the pinion, and the pinion is rotated, whereby the winding shaft is forcibly rotated in the winding direction for winding the webbing belt.
- the restraining force of the occupant body by the webbing belt is increased.
- a plurality of protruding portions are formed so as to protrude from the lower rigidity of the shaft portion and the bearing portion toward the higher rigidity along the rotation radius of the pinion, The tips of these protrusions are in contact with the higher rigidity. That is, in the present invention, the shaft portion is supported by the bearing portion via the protruding portion.
- the shaft portion eccentricity is formed.
- the space between the spindle and the outer periphery is reduced.
- the one with the higher rigidity tries to deform by pressing the protruding portion while rotating relatively to the one with the lower rigidity.
- the contact portion of the protruding portion with the higher rigidity is extremely small compared to the area of the higher rigidity on the side opposite to the lower rigidity, so that the pressing force concentrates on the protruding portion.
- the protruding part is easily plastically deformed.
- the inner peripheral portion of the bearing portion has a larger inner diameter than the outer peripheral portion of the shaft portion, the inner peripheral portion of the bearing portion and the outer peripheral portion of the shaft portion are located on the side of the protrusion along the rotation direction of the shaft portion.
- the protrusion deforms plastically.
- the plastically deformed portion of the protrusion is rotated in the direction of rotation by the relative rotation of the higher rigidity to the lower rigidity. It is dragged and fits in the above gap. Therefore, the plastically deformed portion does not hinder the rotation of the shaft.In this sense, the shaft can be rotated smoothly, and the pressure of the gas supplied from the gas generator must be set to a small value.
- the contact portion of the protruding portion with the higher rigidity is viewed relatively, and if the area of the higher rigidity is extremely small with respect to the area of the portion facing the lower rigidity, the basic The above-described operation is achieved. Therefore, the contact mode of the protruding portion with respect to the one having higher rigidity may be any of surface contact, line contact, and point contact. However, from the viewpoint that a smaller contact portion is preferable, it is more preferable to use a line contact than a surface contact.
- the webbing take-up device wherein the cover is formed of a synthetic resin material, so that the cover is lighter than a case where the cover is formed of a metal material. This contributes to the weight reduction of the webbing take-up device.
- the restriction on the opposite side is formed of metal. For this reason, these parts have higher strength than other parts.
- the rack bar is pressed against the pinion. In the vicinity of the portion facing the shaft along the direction, more protrusions are formed than in other portions.
- the force at which the teeth press the teeth of the pinion to rotate the pinion causes the pinion to be eccentric in the pressing direction by the pressing force at this time.
- the protrusions as described above, many protrusions are formed in the eccentric direction of the pinion. For this reason, when the pinion is eccentric, the outer peripheral portion located inside the bearing means presses the protruding portion to cause plastic deformation.
- the protruding portion is in line of force with the side where the protruding portion is not formed, the pressing force on the protruding portion is more effectively concentrated, and As a result, the protrusion is more easily plastically deformed.
- the regulating member when the inertial mass moves due to a change in the acceleration in the vehicle sudden deceleration state, the regulating member is displaced in conjunction with the movement of the inertial mass, and the rotation of the V gear is stopped. regulate. If the lock base rotates while the rotation of the V gear is restricted, relative rotation occurs between the V gear and the lock base, and this relative rotation causes the V gear to displace the lock plate, and the internal teeth of the ratchet teeth. Align the lock plate external teeth. This prevents the lock base from rotating in the pull-out direction.
- the webbing pulling force acts as a rotational force in the pull-out direction on the toy shaft via the winding shaft, whereby the torsional shaft force is twisted, and the webbing pull-out direction with respect to the lock base. And the webbing is pulled out, and energy is absorbed.
- the biasing means is a spiral coil spring.
- One end of this spiral coil spring is directly or indirectly locked to the winding shaft, and the other end is directly or indirectly connected to the other leg plate of the frame, and the winding shaft is rotated in the pull-out direction. Then, the number of turns of the spiral coil spring is increased, and the restoring force is increased. This restoring force acts as an urging force for urging the winding shaft in the winding direction.
- the outer peripheral portion of the shaft portion is opposed to the outer side of the rack bar via the pinion and along the direction of the mating surface between the rack bar and the pinion.
- a protruding part is formed on the inner peripheral part of the bearing part on the side of the bearing.
- the rack bar rotates the pinion when its teeth press the teeth of the pinion, and the pressing force at this time acts on the mating surface between the rack bar and the pinion. Therefore, by forming the protrusions as described above, many protrusions are formed in the eccentric direction of the pinion. For this reason, when the pinion is eccentric, according to the webbing take-up device according to claim 8, the outer peripheral portion disposed inside the bearing means presses the protruding portion and plastically deforms the protruding portion. Since the protruding portion is in line contact with the non-exposed side, the pressing force against the protruding portion is more effectively concentrated, and the protruding portion is more easily plastically deformed.
- the regulating member when the inertial mass body moves due to a change in acceleration in the vehicle sudden deceleration state, the regulating member is displaced in conjunction with the movement of the inertial mass body to regulate the rotation of the V gear. I do. If the lock base rotates while the rotation of the V gear is restricted, relative rotation occurs between the V gear and the lock base, and this relative rotation causes the V gear to displace the lip plate and lock to the internal ratchet teeth. Combine plate external teeth. This prevents the lock base from rotating in the pull-out direction.
- the webbing pulling force acts as a rotational force in the pull-out direction on the toys shaft via the take-up shaft, whereby the resitration shaft is twisted, and the take-up shaft is webbed with respect to the lock base.
- the webbing is pulled out by being rotated in the pullout direction, and energy is absorbed.
- the urging means is a spiral coil spring.
- One end of this spiral coil spring is directly or indirectly locked to the take-up shaft, and the other end is directly or indirectly connected to the other leg plate of the frame. Then, the number of turns of the spiral coil spring is increased, and the restoring force is increased. This restoring force is the urging force for urging the winding shaft in the winding direction.
- more protruding portions are formed near the portion facing the shaft portion along the direction in which the rack bar is pressed against the pinion than other portions.
- the rack bar rotates the pinion when its teeth press the teeth of the pinion, but the pressing force at this time causes the pinion to be eccentric along the pressing direction.
- the present webbing take-up device by forming the projections as described above, many projections are formed in the eccentric direction of the pinion. For this reason, when the pinionka S 'is eccentric, the outer peripheral portion located inside the bearing means presses the protruding portion to cause plastic deformation.
- the protruding portion is in line contact with the side on which the protruding portion is not formed, the pressing force on the protruding portion is more effectively concentrated. Accordingly, the protruding portion is more easily plastically deformed.
- the regulating member when the inertial mass moves due to a change in acceleration in the vehicle sudden deceleration state, the regulating member is displaced in conjunction with the movement of the inertial mass, thereby regulating the rotation of the V gear. I do. If the lock base rotates while the rotation of the V gear is restricted, relative rotation occurs between the V gear and the lock base, and the relative rotation causes the V gear to displace the lock plate and the internal teeth of the ratchet teeth. Align the lock plate external teeth. This prevents the lock base from rotating in the pull-out direction.
- the webbing pulling force acts on the toys shaft through the take-up shaft as a rotational force in the pull-out direction, thereby twisting the take-up shaft and the take-up shaft against the lock base.
- the webbing is pulled out by being rotated in the webbing withdrawal direction, and energy is absorbed.
- the urging means is a spiral coil spring.
- One end of this spiral coil spring is directly or indirectly locked to the take-up shaft, and the other end is directly or indirectly connected to the other leg plate of the frame. Then, the number of turns of the spiral coil spring is increased, and the restoring force is increased. This restoring force is the urging force for urging the winding shaft in the winding direction.
- the bearing portion on the side opposite to the rack bar via the pinion and facing the outer peripheral portion of the shaft portion along the direction of the mating surface between the rack bar and the pinion.
- a protruding portion is formed on the inner peripheral portion of.
- the rack bar turns the pinion by pushing the teeth of the pinion.
- the pressing force at this time acts in the direction of the mating surface between the rack bar and the pinion. Therefore, by forming the protruding portions as described above, many protruding portions are formed in the bias direction of the pinion. For this reason, when the pinion is eccentric, the outer peripheral portion located inside the bearing means presses the protruding portion and plastically deforms the protruding portion. Since the protruding portion is in line contact with the side not being pressed, the pressing force on the protruding portion is more effectively concentrated, so that the protruding portion is more easily plastically deformed.
- the urging means is a spiral coil spring.
- One end of this spiral coil spring is directly or indirectly locked to the take-up shaft, and the other end is directly or indirectly connected to the other leg plate of the frame. Then, the number of turns of the spiral coil spring is increased, and the restoring force is increased. This restoring force is the urging force for urging the winding shaft in the winding direction.
- the protruding portion is in line contact with the side where the protruding portion is not formed, the pressing force on the protruding portion is more effectively concentrated. Thus, the protrusion is more easily plastically deformed.
- the regulating member when the inertia mass body force excessively moves due to a change in acceleration in a vehicle sudden deceleration state, the regulating member is displaced in conjunction with the movement of the inertia mass body. And regulate the rotation of the V gear. If the lock base rotates while the rotation of the V gear is restricted, relative rotation occurs between the V gear and the lock base, and this relative rotation causes the V gear to displace the lock plate and ratchet the internal teeth. Engage lock plate external teeth with teeth. This prevents the lock base from rotating in the pull-out direction.
- the webbing tensile force acts as a rotational force in the pull-out direction on the torsion shaft via the take-up shaft, whereby the torsion shaft is twisted, and the take-up shaft comes into contact with the lock base.
- the webbing is rotated in the webbing withdrawal direction, and the webbing is drawn out, thereby achieving energy absorption.
- the urging means is a spiral coil spring.
- One end of this spiral coil spring is directly or indirectly locked to the take-up shaft, and the other end is directly or indirectly connected to the other leg plate of the frame. Then, the number of turns of the spiral coil spring is increased, and the restoring force is increased. This restoring force is the urging force for urging the winding shaft in the winding direction.
- the regulating member when the inertial mass moves due to a change in acceleration in the vehicle sudden deceleration state, the regulating member is displaced in conjunction with the movement of the inertial mass, thereby regulating the rotation of the V gear. I do.
- the lock base rotates while the rotation of the V gear is restricted, relative rotation occurs between the V gear and the lock base, and this relative rotation causes the V gear to displace the lock plate to the internal teeth of the ratchet teeth. Align the lock plate external teeth. This prevents the lock base from rotating in the pull-out direction.
- the webbing pulling force acts as a rotating force in the pull-out direction on the torsion shaft via the take-up shaft, whereby the return shaft force is returned, and the take-up shaft moves to the lock base.
- the webbing is rotated in the webbing withdrawing direction, and the webbing is pulled out, so that energy is absorbed.
- the biasing means is a spiral coil spring.
- One end of this spiral coil spring is directly or indirectly locked to the take-up shaft, and the other end is directly or indirectly connected to the other leg plate of the frame.
- the number of turns of the spiral coil spring increases, and the restoring force increases. This restoring force urges the winding shaft in the winding direction. It becomes an urging force.
- the urging means is a spiral coil spring.
- One end of this spiral coil spring is directly or indirectly locked to the take-up shaft, and the other end is directly or indirectly connected to the other leg plate of the frame. Then, the number of turns of the spiral coil spring is increased, and the restoring force is increased. This restoring force is the urging force for urging the winding shaft in the winding direction.
- FIG. 2 is an exploded perspective view showing a configuration of the frame on the other leg plate side in the configuration of the webbing take-up device according to one embodiment of the present invention.
- FIG. 3 is a front cross-sectional view showing the configuration of the device main body and the lock device in the configuration of the webbing take-up device according to one embodiment of the present invention.
- FIG. 4 is a front view of the frame.
- FIG. 5 is a longitudinal sectional view schematically showing the configuration of a webbing take-up device according to an embodiment of the present invention, and is a diagram showing the direction of a rotational moment generated when a tensile force is applied. It is a front view showing the composition of one shot shaft.
- FIG. 7 is a plan sectional view taken along the line 7-7 in FIG. 9 showing a mechanism for assembling the spool and the hook base.
- FIG. 8 is a front view showing a mechanism for assembling the spool and the lock base.
- FIG. 9 is a vertical cross-sectional view taken along line 9-9 of FIG. 7 showing a mechanism for assembling the spool and the hook base.
- Figure 10 is a front view of the stove
- FIG. 11 is an enlarged plan sectional view of a main part on the other leg plate side.
- FIG. 12 is a rear view showing the configuration of the concave portion of the clutch unit.
- FIG. 13A is a side view showing the configuration of the roller of the clutch unit, and
- FIG. 13B is a front view showing the configuration of the roller of the clutch unit.
- FIG. 4 is an exploded perspective view of the pretensioner at a different viewing angle from FIG.
- FIG. 15 is a diagram showing the formation positions of the protruding portions.
- FIG. 16 is a sectional view showing the configuration of the cylinder body of the cylinder.
- FIG. 17 is an exploded perspective view corresponding to FIG. 14 showing a modification of the pretensioner.
- FIG. 18 is a cross-sectional view corresponding to FIG. 16 showing a modification of the pretensioner.
- FIG. 19 is a cross-sectional view showing the configuration of the biasing portion.
- FIG. 20 is an exploded perspective view showing a configuration of a main part of the urging unit.
- FIG. 21 is an enlarged front sectional view of the vicinity of the lock device of the webbing take-up device according to one embodiment of the present invention.
- FIG. 22 is a plan view of the lock cover.
- FIG. 23 is a side view of the lock cover.
- FIG. 24 is a side sectional view of the lock cover.
- FIG. 25 is a plan view of the V gear.
- FIG. 26 is a side view of the lock base.
- FIG. 27 is a front view of the lock plate.
- FIG. 28 is an exploded perspective view showing a configuration of a main part of a portion for accommodating the compression coil spring.
- FIG. 29 is a cross-sectional view taken along the line 29-29 of FIG. 25, showing a state of assembling the compression coil spring.
- FIG. 30 is a side view showing the unlocked state of the webbing take-up device according to one embodiment of the present invention.
- FIG. 31 is a side view showing a locked state of the webbing take-up device according to one embodiment of the present invention.
- FIG. 32 is a side view of the acceleration sensor.
- BEST MODE FOR CARRYING OUT THE INVENTION 1 and 2 show an exploded perspective view of a webbing take-up device 10 according to an embodiment of the present invention.
- the webbing take-up device 10 is constituted by a device main body 12, a pretensioner 14, a biasing portion 16, and a lock device 18.
- the apparatus main body 12 includes a frame 20.
- the frame 20 includes a flat base 22 and a pair of leg plates 24 and 26 extending in parallel in the same direction from both ends in the width direction of the base 22.
- the base 22 has a U-shape that is open on one side in the thickness direction of the base 22 in plan view.
- FIG. 4 shows a front view of the frame 20.
- the lower part of the base part 22 of the frame 20 below the connection part with the leg plates 24 and 26 has a substantially triangular fixed part 2 whose width gradually decreases downward.
- a bolt through hole 30 penetrating along the thickness direction of the base 22.
- the bolt through hole 30 is a long hole extending in the longitudinal direction along the width direction of the base 22, and the bolt passes through the bolt through hole 30, and further passes through the support portion 32 provided in the vehicle body.
- a pair of positioning holes 36 are formed above the bolt holes 30.
- Each of the positioning holes 36 is a long hole elongated in the direction inclined in the width direction with respect to the longitudinal direction (vertical direction) of the base 22, and is approximately at both ends in the width direction of the fixed portion 28. It is formed along the shape of an inverted V-shape in which the distance between each other decreases toward the top (lower end) of the fixing portion 28.
- a pair of claw portions 38 corresponding to these positioning holes 36 are formed in the support portion 32 described above, and these claw portions 38 are temporarily inserted into the positioning holes 36 by temporarily inserting the base portions into the base portions.
- the support 22 is supported by the support 32 so that the base 22 can be positioned with respect to the support 32.
- the positioning holes 36 are formed, for example, by the angle formed by the positioning holes 36 between the driver's seat side webbing retractor 10 and the passenger seat side webbing retractor 10.
- the angle formed by the pair of claw portions 38 of the driver side support portion 32 corresponds to the angle formed by the pair of claw portions 38 of the passenger side support portion 32.
- a pilot hole 40 for guiding in press forming for forming the frame 20 is formed in the widthwise intermediate portion near the upper end of the base 22, and further, below the pilot hole 40.
- the lightening portion 54 On the side of the leg plate 24 of the connector mounting hole 42, a plurality of lightening portions 54, 56 are formed laterally.
- the lightening portion 54 has an end 54 A at the center in the width direction of the base 22 and an end at the widthwise outside of the base 22 (that is, the side of the leg plate 24). It is located lower than 54 B and is a long hole whose longitudinal direction is from the end 54 A to the end 54 B or the opposite direction. The direction from the end 54 A to the end 54 B is parallel to the direction from the center of the bolt hole 30 to the center of the ratchet hole 96 formed in the leg plate 24. .
- the width of the lightening portion 54 is substantially equal along the longitudinal direction of the lightening portion 54, and one end 54C and one end 54D of the lightening portion 54 in the width direction are parallel to each other. It has been. However, the ends 54A and 54B are generally linear along the vertical direction of the base 22, and are not perpendicular to the longitudinal direction of the hollow portion 54. Therefore, the hollow portion 54 is generally formed in a substantially parallelogram shape.
- the lightening portion 56 is formed below the lightening portion 54.
- the hollow portion 56 is formed by two through holes, a rectangular hole 58 and a rectangular hole 60.
- the rectangular hole 58 is positioned such that the end 58 A at the center in the width direction of the base 22 is lower than the end 58 B at the outside of the base 22 in the width direction (that is, the side of the leg plate 24).
- the long hole extends from the end 58 A to the end 58 B or in the opposite direction.
- the rectangular holes 58 have substantially the same width dimension along the longitudinal direction of the rectangular holes 58, and both ends 58C and 58D in the width direction of the rectangular holes 58 are parallel.
- the ends 58 A and 58 B are generally linear along the vertical direction of the base 22, and are not perpendicular to the longitudinal direction of the rectangular hole 58. . Therefore, the rectangular hole 58 has a generally parallelogram shape.
- the rectangular hole 60 is formed above the rectangular hole 58 and on the leg plate 24 side.
- the other end 60B is located outside the base 22 in the width direction and above the one end 60A in the longitudinal direction of the base 22, and from the end 6OA. It is an elongated hole extending toward the end portion 60B and in the opposite direction.
- both ends 60 C and 60 D in the width direction of the rectangular hole 60 are parallel to each other, and the end 60 C is located on an extension of the end 58 C of the rectangular hole 58 described above, The end 60 D is located on an extension of the end 58 D of the rectangular hole 58 described above.
- Bridge portion 62 is provided between A and A.
- the bridge portion 62 corresponds to the positioning hole 36 relatively located on the leg plate 24 side of the pair of positioning holes 36 described above.
- the bridge portion 62 is placed upright on the end on the outer side in the width direction of 22. Since the bridge portion 62 is located above the end on the side where the bridge portion 62 is located outside in the width direction of the base portion 22, the bridge portion 62 is formed on the support portion 32 that enters the positioning hole 36. The positioning projection of the frame 20 is prevented from accidentally entering the rectangular hole 58 or the rectangular hole 60.
- the hollow portion 56 formed by the rectangular hole 58 and the rectangular hole 60 can be regarded as being divided into the rectangular hole 58 and the rectangular hole 60 by the bridge portion 62.
- the lightening portion 56 is divided by the bridge portion 62. That is, considering a configuration in which the bridge portion 62 is not intentionally formed from the lightening portion 56 shown in FIG. 4, the lightening portion 56 extends from the end 58A to the end 60B, Alternatively, it is a long hole extending in the opposite direction and parallel to the lightening portion 54.
- the longitudinal direction is a ratchet hole 96 formed in the leg plate 24 from the center of the bolt hole 30. Parallel to the direction of the center.
- the lightened portion 44 has an end 44 A at the center in the width direction of the base 22, and a lower end than the end 44 B at the outside in the width direction of the base 22 (that is, the leg plate 26 side). It is a long hole whose longitudinal direction is from the end 44A to the end 44B or the opposite direction. The direction from the end 44 A to the end 44 B is parallel to the direction from the center of the through hole 30 to the center of the leg plate 26.
- the width of the hollow portion 44 is approximately equal along the longitudinal direction of the hollow portion 44, and both ends 4 4C and 44D in the width direction of the hollow portion 44 are parallel to each other. .
- the ends 44 A and 44 B are substantially linear along the vertical direction of the base 22, and are not perpendicular to the longitudinal direction of the hollow portion 44. Therefore, the lightening portion 44 is generally formed in a substantially parallelogram shape.
- the lightening portion 46 is formed below the lightening portion 44.
- the hollow portion 46 is formed by two through holes, a rectangular hole 48 and a rectangular hole 50.
- the rectangular hole 48 is located such that the end 48 A at the center in the width direction of the base 22 is lower than the end 48 B at the outside in the width direction of the base 22 (that is, the leg 26 side).
- a long hole extends from the end 48 A to the end 48 B or in the opposite direction.
- the width of the rectangular hole 48 is substantially equal along the longitudinal direction of the rectangular hole 48, and both ends 48C and 48D in the width direction of the rectangular hole 48 are parallel.
- the ends 48A and 48B are generally linear along the vertical direction of the base 22 and are not perpendicular to the longitudinal direction of the rectangular hole 48.
- the rectangular hole 50 is above the rectangular hole 48. And is formed on the leg plate 26 side.
- the rectangular hole 50 is a long hole extending in the longitudinal direction along the vertical direction of the base 22, and its upper end 5 OA and lower end 50 B are the ends 4 8 C, 48 of the rectangular hole 48 described above. It is an extension of D.
- both ends 50 C and 60 D in the width direction of the rectangular hole 50 are parallel to each other along the vertical direction of the base 22. That is, the rectangular hole 50 has a substantially parallelogram shape as a whole.
- a bridge section 52 is formed between B and B.
- the bridge portion 52 corresponds to the positioning hole 36 relatively located on the leg plate 26 side of the pair of positioning holes 36 described above.
- the base portion 2 The bridge portion 52 is located above the end on the side located outside in the width direction of No. 2.
- the bridging part 52 is located outside the base part 22 in the width direction. The position of the ridge portion 52 above the end on the side where it is located prevents the claw portion 38 of the support portion 32 from accidentally entering the rectangular hole 48 or the rectangular hole 50. .
- the hollow portion 46 composed of the rectangular hole 48 and the rectangular hole 50 can be regarded as being divided into the rectangular hole 48 and the rectangular hole 50 by the bridge portion 52.
- the lightening portion 4 6 is viewed from the functional side, the lightening portion is
- the hollow portion 46 extends from the end 48 A to the end 50 D.
- a hole having a substantially parallelogram shape that is long in the opposite direction and parallel to the lightening portion 44 is formed, and the longitudinal direction is a ratchet hole 9 formed in the leg plate 24 from the center of the bolt hole 30. It is parallel to the direction toward the center of 6.
- the lightening portions 5 4 5 6 4 6 and 4 6 are lighter than those without them, but the rigidity is also reduced.However, the lightening portions 5 4 5 6 4 6 and 4 6 When the webbing belt 68 for restraining the occupant (see FIG. 5) is pulled while the rotation of the spool 70 is restricted, the tensile force F applied to the base 22 via the leg plates 24, 26 when the occupant restraining belt 68 is pulled. Along the direction of action. Therefore, the bone portion 64 formed between the lightening portion 54 and the lightening portion 56 has a length and a substantially equal width in the direction of action of the tensile force F.
- the bone portion 66 formed between the portion 44 and the lightening portion 46 is also longitudinal and has substantially the same width in the direction of action of the tensile force F.
- the formation of such bones 64, 66 reduces the overall rigidity of the base 22, but ensures the strength (rigidity) with respect to the tensile force F, and furthermore, the base 22 with respect to the tensile force F. Stiffness (in other words, elasticity) becomes uniform.
- a spool 70 as a winding shaft is disposed between the leg plate 24 and the leg plate 26 of the frame 20 described above.
- the spool 70 has a shaft core ⁇ : a cylindrical spool shaft 7 OA to constitute, and a pair of flange portions (hereinafter referred to as leg plate 24 sides) formed at both ends of the spool shaft 7 OA in substantially disk shapes.
- the flange located on the side of the leg plate 26 is called “flange 70 B”, and the flange located on the side of the leg plate 26 is called “flange 70 C”. It has a shape.
- a shaft through-hole 72 is formed in the shaft core of the spool shaft 7OA, and a torsion shaft 92 is passed through the shaft.
- a recessed sleeve receiving portion 74 having a larger diameter than the shaft through-hole 72 is formed on the flange portion 70C side of the shaft through-hole 72.
- a female spline force is formed on the inner peripheral portion of the sleeve receiving portion 74, a male spline is formed on the outer peripheral portion of the sleeve receiving portion 74, and a hexagonal hole 7 is formed in the shaft core portion.
- the sleeve 78 formed with 6 forces is fitted.
- a recessed lock base receiving portion 80 having a larger diameter than the shaft insertion hole 72 is formed coaxially on the flange portion 70 B side of the shaft opening hole 72.
- the lock base receiving portion 80 is constituted by a concave portion main body 80A that occupies the majority thereof, and a concave portion end portion 80B having a larger diameter than the concave portion main body 80A.
- the lock base receiving section 80 is provided with a lock base 82 manufactured by die casting.
- a stopper insertion groove 86 into which a later-described stopper 84 can be inserted is formed at an axially intermediate portion of the recess main body 8 OA of the spool shaft 7 OA.
- the stopper insertion groove 86 has a top mounting groove 86 A formed in an arcuate shape along the outer periphery of the spool shaft 7 OA and having an inverted “convex” cross section, and a top mounting groove.
- a pair of leg insertion grooves 86 B formed orthogonal to and parallel to 86 A.
- an annular groove 88 is formed at an intermediate portion in the axial direction of the base portion 82A of the lock base 82 at a position facing the pair of leg insertion grooves 86B. .
- the stopper insertion groove 86 and the annular groove 88 have a substantially U-shape when viewed from the front.
- the stopper 84 is inserted so that the relock base 82 is locked in the lock base receiving portion 80 of the spool shaft 7OA in a state where it is prevented from coming off.
- the stopper 84 has a top 84A and a pair of legs 84B suspended parallel to each other from both sides of the top 84A.
- a rib 90 having a predetermined width is formed on the inner peripheral side of a portion extending from the top portion 84A to the leg portion 84B.
- the cross-sectional shape of the top portion 84A of the stopper 84 is the same inverted "convex" shape as the cross-sectional shape of the top mounting groove 86A formed in the spool shaft 7OA.
- the width of the leg portion 84 B of the stopper 84 is set to be substantially the same as the width of the leg insertion groove 86 B and the annular groove 88.
- the stopper 84 is made of a resin material or a spring material, and is capable of elastically deforming the pair of legs 84 B in a direction in which they approach and separate from each other.
- the stopper 84 is provided between one side 86 C of the leg insertion groove 86 B of the spool shaft 7 OA and one side 88 A of the annular groove 88 of the lock base 82.
- the leg portion 8 4 B is pressed into the hole.
- the lock base 82 is pressed toward the center of the spool shaft 7 OA in the axial direction (the direction of the arrow A in FIG. 7), so that there is play in the axial direction between the lock base 82 and the spool shaft 7 OA. Disappears.
- the pair of legs 84b of the stono 84 are positioned between the leg insertion groove 86b of the spool shaft 70a and the annular groove 88 of the mouth base 82, that is, the base of the lock base 82. Because of the press fit on both sides in the radial direction of 82 A, the base between the base of the lock base 82 and the outer circumference of the spool shaft 72 A and the inner circumference of the recess 70 A of the spool shaft 8 OA The radial play is also eliminated. As a result, the lock base 82 and the spool shaft 70A are interconnected and the spool shaft of the lock base 82 is in a state where play is eliminated in both the axial direction and the radial direction.
- the OA is prevented from falling off.
- the lock base 82 is fixed to the spool shaft 7OA by the stopper 84 by forming it in a letter shape
- the lock base 82 is equidistant from its axis and has two radially opposite ends.
- the press fit load is equally received from the pair of legs 84B at the locations, thereby preventing the lock base 82 from tilting with respect to the axis of the spool shaft 7OA. This results in a webbing belt 6 8 (see Fig. 5) can be improved.
- the lock base 82 and the sleeve 78 described above are connected to each other by a tone shaft 92.
- the torsion shaft 92 includes a shaft 92A constituting a main part thereof, and a hexagonal head 92B formed at one end of the shaft 92A.
- a hexagonal fitting portion 92C formed at the other end of the shaft portion 92A, and a small diameter extending coaxially with the shaft portion 92A from the shaft core of the fitting portion 92C.
- Part 92D a gear holding part 92E that is reduced in diameter through a tapered surface from the small diameter part 92D, and then expanded in an annular shape, and further coaxially extends from the gear holding part 92E.
- a key-formed tip portion 9 2F As shown in FIG. 3, the head 9 2 B of the torsion shaft 92 is fitted into a hexagonal hole 76 formed in the sleeve 78, and the torsion shaft 9 2
- the second fitting portion 92C is fitted into a hexagonal hole-shaped fitting hole 94 formed in the lock base 82.
- the toys shaft 92 is integrated with the spool shaft OA via the lock base 82 and the sleeve 78.
- the torsion shaft 92 having the above structure is a main component of a so-called force limiter that twists and deforms to absorb energy when a webbing tension of a predetermined value or more acts on the spool 70 during rapid deceleration of the vehicle. .
- a pinion 102 constituting the pretensioner 14 is fitted on the outer peripheral side of the intermediate portion 78B and the small diameter portion 78C.
- the pinion 102 covers the small-diameter portion 78 C of the sleeve 78, and has a tooth portion 104 having pinion teeth 104 A formed on the outer peripheral portion, and an intermediate portion 78 B of the sleeve 78.
- a clutch portion 106 as a shaft integrally formed adjacent to the tooth portion 104.
- each recess 108 is formed at intervals of 120 degrees. These recesses 108 communicate with each other in the circumferential direction, and the wide portion of each recess 108 accommodates a roller 110 shown in FIGS. 13A and 13B, respectively. . Inside the sleeve 7 8 on the outer surface of the roller 110 It has the same flat mouth opening as that of the middle section 78B.
- the pretensioner 14 including the clutch portion 106 includes a metal cover 111, which is fixed to the leg plate 26 by fastening means such as a
- the casing includes a casing body 114 formed of a synthetic resin material having a lower rigidity than the casing 112 and the leg plate 26, and a casing 116 constituted by:
- the casing body 1 1 4 of the casing 1 16 has the same thickness direction as the thickness direction of the leg plate 26, and is disposed adjacent to the leg plate 26 outside the thickness direction of the leg plate 26. It has a bottom 118 that is provided. In the bottom
- the inner diameter dimension is coaxial with the hole 122 from the outer end face in the depth direction of the hole 122.
- the outer peripheral portion of 124 touches the inner peripheral portion of hole 120.
- the axial dimensions and the like of the bearing main body 124 are set so that the spool 70 is mounted on the frame 20 so as to face the outer peripheral portion of the clutch portion 106 along its radial direction.
- the inner diameter is slightly larger than the outer diameter of the clutch part 106.
- a plurality of protrusions 126 are formed on the inner peripheral portion of the bearing body 124. These protruding portions 126 are formed in the longitudinal direction along the axial direction of the bearing body 124, and when viewed along the axial direction of the bearing body 124 (the state shown in FIG. 15), they are half as long. It has a circular shape or a triangular shape (the triangular shape in the present embodiment) with the inside of the bearing body 124 in the radial direction as the apex, and is formed substantially uniformly along the axial direction of the bearing body 124. .
- the protrusions 126 are not formed at regular intervals along the inner circumferential direction of the bearing body 124, but are formed around the center of the bearing body 124.
- the teeth 130 of the rack bar 128 described later are used.
- Pi The area that is axially symmetrical with respect to the area (the third area in Fig. 15) that includes the abutment portion in the state of engagement with the pinion teeth 104A of the second pin 102 (the third area in Fig. 15) It is mainly formed in one area J (that is, the first area has more protrusions 126 formed than the second to fourth areas).
- the dimension from the inner periphery of the hole 120 to the end of the protrusion 126 radially inward of the hole 120 is approximately equal to the gap S described above. That is, with the center of the hole 120 as an axis, the radius of an imaginary circle connecting the end of the protrusion 126 around this axis is approximately equal to the outer diameter of the clutch 106, In the assembled state of the winding device 10, the end of the protruding portion 126 contacts the outer peripheral portion of the clutch portion 106, and the bearing body 124 via the protruding portion 126 engages the clutch portion 10. 6 (that is, the other end of the spool 70 in the longitudinal direction).
- the protruding portion 1 26 has a semi-circular shape when viewed along the axial direction of the bearing main body 124 (the state shown in FIG. 15), or has a vertex at the inside in the radial direction of the bearing main body 12.
- the contact between the end of the protruding portion 126 and the outer periphery of the clutch portion 106 in the assembled state of the webbing take-up device 10 is as follows. Are in linear contact along the axial direction of the bearing body 124.
- the clutch portion 106 is pivotally supported in line contact with the tip of the protruding portion 126. Since the clutch portion 106 is pivotally supported by the protruding portion 126 in a line contact state, the clutch portion 106 is rotated eccentrically with respect to the bearing body 124 along the radial direction. Even in this case, the protruding portion 126 is gradually plastically deformed from its distal end in the rotational direction of the spool 70 while being dragged in the rotational direction due to frictional resistance with the clutch portion 106, so that the spool 70 is smooth. So that it can be rotated.
- the inner diameter of the bearing body 124 is slightly larger than the outer diameter of the clutch 106, and the clearance S (see FIG. Therefore, the plastically deformed portion of the protruding portion 1 26 dragged by the rotating clutch portion 106 only enters the gap S, and the plastically deformed portion becomes the clutch portion 106. In this sense, the clutch unit 106 can rotate smoothly.
- the pretensioner 14 includes a cylinder 134 in which a piston 132 is housed.
- the axial direction of the cylinder 13 4 is as described above; the cylinder body 13 6 having a bottomed cylindrical shape whose direction is orthogonal to the axial direction of the cylinder 70 and whose upper end is open; It is composed of a cylindrical generator accommodating section 1338 provided integrally with the outer peripheral wall of the main body 1336, and has a generally "J" shape in a front view as a whole.
- a bottom portion 140 of the cylinder body 136 is provided with a concave portion 142 having a circular opening cross section.
- the recessed portion 142 has a smaller diameter than the inner diameter of the cylinder body 135, and the bottom portion 140 and the recessed portion 142 are stepped and serve as positioning and holding positions for a 0 ring 144 described later. I have.
- the 0 ring 144 is a member formed in a ring shape from a rubber material or a synthetic resin material having elasticity of about the same as a rubber material, and has a cylindrical shape formed on the end surface of the piston 140 on the bottom 140 side. And seals between the piston 13 2 and the inner wall 1 48 of the cylinder body 13 6.
- the O-ring 144 touches the bottom 140 in a state where the piston 132 does not directly contact the bottom 140, and the position of the piston 132 in this state is the piston 1 32 Is the initial position.
- the seal holding portion 144 is located in the above-described recessed portion 142.
- the concave portion 144 is set to a depth such that the seal holding portion 144 does not abut against the bottom wall of the concave portion 142 when the O-ring 144 is elastically deformed.
- the O-ring 14 is fitted around the outer periphery of the seal holding portion 146 integrally formed on the bottom 140 side of the piston 132, and the O-ring is formed.
- the biston 1332 must be inserted into the cylinder 1334 together with the 144, eliminating the need for cutting to form the seal holding groove often used in conventional pretensioners. This eliminates the need to expand the O-ring and mount the O-ring in the seal holding groove.
- the configuration using the ring-shaped ⁇ ring 14 is used.
- the piston ring 150 is replaced with the 0 ring 144. It may be used instead.
- the piston ring 150 has a substantially ring-shaped upper wall portion 152 and a side wall portion 154 extending vertically downward from the outer peripheral portion of the upper wall portion 152. It has been.
- the upper wall part 152 of the piston ring 150 is fitted on the outer periphery of the seal holding part 144 of the piston 132, thereby holding the piston ring 150 on the piston 13 Have been.
- the side wall portion 154 of the biston ring 150 comes into contact with the inner wall 148 of the cylinder body 136 described above, and the lower end of the side wall portion 154 of the biston ring 150 also has an inner wall 154.
- the piston ring 150 has elasticity, so that when gas is supplied into the cylinder body 135, the pressure of this gas causes the piston ring 150 to be pressed against the bottom surface of the piston 135.
- the biston ring 150 seals between the biston 132 and the inner wall 148 of the cylinder body 136.
- the piston ring 150 has a gap portion 156 which is continuous with both the upper wall portion 152 and the side wall portion 154, and through the gap portion 156, the bottom side of the piston 133 is formed. The structure allows gas to flow out from the upper side. Therefore, an extremely high gas pressure in the cylinder body 1 36 is prevented.
- the biston ring 150 is partially formed when the pretensioner is operated at a high temperature such as in a fire.
- the gas softens (liquefies), and gas flows out from the bottom side of the piston 13 2 to the top side. This makes it possible to prevent the gas pressure in the cylinder main body 1336 from rising extremely at high temperatures.
- the generator housing 1338 has its axial direction inclined with respect to the axial direction of the cylinder main body 1336, and is connected to the cylinder main body 1336. Is open on the opposite side.
- a gas generator 158 is arranged inside the generator housing section 138.
- a starting device, a detonator, a detonator, a gas generating agent, etc. are stored inside the gas generator 158. The starting device is activated to ignite the detonator and discharge the detonator. By burning the gas generant through Thus, a predetermined amount of gas is generated in a very short time.
- a cap 160 is screwed into the open end of the generator accommodating section 138 to prevent the gas generator 158 from coming off at the time of ejection or the like. Further, at the connecting portion between the generator housing 1 38 and the cylinder body 1 36, the inside of the generator housing 1 38 and the inside of the cylinder body 1 36 communicate with each other. The generated gas is supplied to the inside of the cylinder body 135, and the piston pressure is moved by this gas pressure.
- a rack bar 1 288 is provided on the piston 13 2.
- the rack bar 1 28 has a longitudinal direction along the axial direction of the cylinder 13 4, and a gear section 16 2 formed by a plurality of teeth 13 2 is formed at one end in the width direction thereof. ing.
- the teeth 130 of the gear portion 162 are formed so as to be able to be engaged with the pinion teeth 104 A of the pinion 102.
- the cover 1 1 2 has a stop ring 1 6 4 which is bent at a substantially right angle from the upper end to the frame 20 side corresponding to the tip of the rack bar 1 2 8. This restricts the upward movement of the rack bar 128 beyond a predetermined distance and restricts the rack bar 128 from popping out.
- the frame 20 side from the side end of the cover 112 opposite the one end in the width direction of the rack bar 128 A stopper portion 166 is formed which is bent at substantially right angles to limit the displacement of the rack bar 128 caused by the reaction force from the pinion 102.
- the cover 1 12 on which the above-mentioned stopper portions 16 4 and 16 6 are formed is made of metal, the rigidity is higher than when the cover 1 12 is formed of a synthetic resin material. Highly, the above restrictions can be ensured. Further, a shaft 168 force is formed at the shaft center of the end face of the pinion 102 opposite to the clutch portion 106, and a bearing hole 170 formed in the cover 112 supports the shaft.
- a biasing portion 16 is provided on the side of the pretensioner 14 having the above configuration.
- the biasing portion 16 has a cover 17 2.
- the cover 1 7 2 is formed in a shallow box shape opening toward the leg plate 26,
- a spiral coil spring 17 4 as a step is arranged.
- the spiral coil spring 17 4 has its outer end in the spiral direction locked at a predetermined position on the cover 17 2 .
- the inner end in the spiral direction is locked to the rotating shaft 17 6.
- the rotating shaft 1 76 is supported by a cover mounting base 1 78 serving as a cover holder disposed on the leg plate 26 side of the cover 1 72, and coaxially with the sleeve 78 described above. They are fitted and integrated.
- the spool 70 is urged in the direction in which the webbing belt 68 is wound up via 78.
- a hole 180 as an engagement hole is formed at a predetermined position on the outer peripheral side of the cover mount 178.
- a claw portion 184 as an engaging portion is formed at the tip of the elastic bending member 1802 forming the hole portion 180.
- an elastic engaging claw 186 is formed at a predetermined position on the outer peripheral portion of the cover 112.
- the engaging claw 1886 is bent from the outer peripheral portion of the cover 172 to one end in the drawing, and is bent upward at the one end, and is turned downward in succession to the deformed portion 1888. It consists of an extending engaging portion 190.
- the engaging portion 190 has a rectangular hole portion 192 extending in the longitudinal direction.
- a lock device 18 is arranged on the side of the leg plate 24 described above.
- the lock device 18 includes the lock base 82 described above.
- the structure of the lock base 82 will be described in detail.
- the lock base 82 is formed in a cylindrical shape with a flange.
- the base portion 82 A fitted to the recessed body 80 of 80 and the base portion 82 A having a larger diameter than the base portion 82 A and fitted to the recessed end portion 80 B of the lock base receiving portion 80. It is composed of an intermediate portion 82B and a holding portion 82C having a larger diameter than the intermediate portion 82B and arranged in contact with the outer surface of the flange portion 70B.
- a hexagonal hole 94 is formed in the lock base 82 except for the outer end of the shaft core. At the outer end of the shaft core portion, a small hole 202 having a diameter smaller than that of the fitting hole 9 is formed.
- a ratchet hole 96 is formed by punching on the upper side of leg plate 24 of frame 20 described above.
- the ratchet teeth 96 A of the ratchet hole 96 are set to high strength.
- a holding portion 82C of the lock base 82 is arranged inside the ratchet hole 96.
- the small diameter portion 92D of the torsion shaft 92 is inserted into the small hole 202 formed in the shaft core portion of the holding portion 82C.
- a concave accommodating portion 204 formed in the circumferential direction around the small hole 202 (see FIGS. 25, 26, 28, and 29) are formed.
- One end of the housing portion 204 is closed, while the other end of the housing portion 204 is open.
- the accommodation portion 204 has a substantially circular plate shape as a whole, and has a single lock plate 206 (see FIGS. 27 to 29) which is a component of the lock device 18. Is housed.
- the lock plate 206 includes a metal plate main body 206 A having a substantially arc-shaped plate shape, and a rectangular protrusion 200 B protruding from one end of the plate main body 206 A. Same as high-strength locking teeth 206C formed on the outer periphery of the other end of the plate body 206A and engaging with the ratchet teeth 96A of the ratchet hole 96 of the leg plate 24. A guide bin 206D is provided upright from the other end of the plate body 206A. In addition, the length obtained by adding the width of the plate body 206 A and the protruding length of the protrusion 206 B is equal to the width of the wide portion 204 of the accommodation portion 204 of the lock base 82. Is almost the same as
- a thin disk-shaped lock cover 208 is attached to the outer surface of the holding portion 82C of the lock base 82 to prevent the lock plate 206 from falling off. Have been.
- the lock cover 208 is formed in a disk shape as a whole, and is cut and raised into a claw shape at a center portion to form a push nut portion 208. A is formed. This push nut portion 208 A is locked to the tip of the torsion shaft 92.
- a pair of hooks 1 ⁇ 208B extend opposite to the peripheral edge of the lock cover 208. As shown in FIG. 21, these hook portions 208 B are locked by locking projections 83 provided on the lock base 82. That is, in the lock cover 208, the push nut portion 208 A is locked to the torsion shaft 92, and the hook portion 208 B is related to the locking protrusion 82 D of the lock base 82. By being stopped, the lock base 82 and the lock plate 206 are attached while being covered.
- an outer peripheral flange portion 208 C is provided on the outer peripheral edge of the lock cover 208.
- the outer peripheral flange portion 208C overlaps the leg plate 24.
- the lock cover 208 covers the lock base 82 and the lock plate 206 with the leg plate 24 sandwiched by the spool 70.
- a cylindrical boss 2 12 is formed on the shaft core of the V gear 210 so that it can rotate following the gear holding section 9 2 E of the torsion shaft 92. It is pivoted.
- a V-shaped guide hole 2 14 is formed in the V gear 210, and a guide pin 2 06 standing upright from the lock plate 206 is formed in the guide hole 2 14. D has been introduced.
- an opening tooth 21OA is formed in a body.
- a rectangular insertion hole 2 penetrating along the thickness direction of the V gear 210 is provided between the center of the V gear 210 and the outer peripheral portion. 16 are formed.
- the insertion hole 2 16 is an imaginary part formed on the outer peripheral portion of the V gear 210 at a portion opposite to the center of the V gear 210 via the portion where the insertion hole 2 16 is formed. It has a rectangular shape elongated along an imaginary straight line connecting both ends of the arc, and its overall length in the longitudinal direction is shorter than the natural length of the compression coil spring 218. The length is longer than the total length of the compression coil spring, or is equal to the total length of the compression coil spring 218 in the fully adhered state.
- the width of the insertion hole 2 16 in the width direction is longer than the outer diameter of the compression coil spring 2 18.
- a wall 220 serving as a wall (one wall) on the rotating body side is formed on the end face on the side facing the lock base 82 in the assembled state of the V gear 210.
- the wall portion 220 is located on the winding direction side, which is the rotation direction of the spool 70 when the spool 70 winds the webbing belt 68, among the longitudinal end portions of the above-described insertion hole 2 16.
- the distance from the end 2 16 A of the insertion hole 2 16 to the wall 220 is the sum of the long dimension of the insertion hole 2 16 (that is, the wall 2 220 and the insertion hole 2 (Distance to the other end 2 16 B in the longitudinal direction of 16) is sufficiently shorter than the natural length of the compression coil spring 2 18.
- a pair of restricting walls 222, 224 are formed at both ends in the width direction of the wall 220 toward the end 216B of the insertion hole 216.
- the limiting wall 2 26 as a limiting portion connects the limiting walls 222, 224. It is force-formed and forms a spring box 228 together with the restriction walls 222, 224. Both the distance between the restriction wall 2 2 2 and the restriction wall 2 2 4 and the distance between the restriction wall 2 2 6 and the V gear 2 10 are slightly larger than the outer diameter of the compression coil spring 2 18 .
- the axial direction of the compression coil spring 218 (more specifically, the axial direction of the cylinder when the compression coil spring 218 is regarded as a cylinder from its outer shape)
- One end side is housed, and in the housed state, one end in the axial direction of the compression coil spring 218 contacts.
- the V gear 210 is formed with a rectangular small window 230 penetrating along the thickness direction thereof.
- the small window 230 is elongated along the width direction of the above-described insertion hole 216, and both ends in the longitudinal direction correspond to the limiting walls 222, 224, and one end in the width direction. Corresponds to the restriction wall 2 26.
- the small window 230 communicates with the inside of the above-described spring box 228 and the opposite side to the spring box 228 via the V gear 210, and from the opposite side.
- the vicinity of the bottom (that is, the restriction wall 226) of the springer box 228 can be visually recognized.
- a substantially fan-shaped through hole 2 32 through which the storage box 2 28 penetrates is formed.
- the through holes 2 32 not only allow the spring box 228 to penetrate, but also allow the spring box 228 to rotate at a predetermined angle around the center circumference of the V gear 210 in this storage state. Therefore, the V gear 210 is coaxially rotatable relative to the lock cover 208 by a predetermined angle.
- the above-mentioned holding portion 82 C of the lock base 82 is provided with a spring box 222 and a compression coil spring 210 which penetrate through the through hole 230 when the V gear 210 is assembled.
- a spring accommodating portion 234 for accommodating therein is formed.
- the spring accommodating portion 2 3 4 is a concave portion opened at the end opposite to the V gear 210 when the hook base 82 and the V gear 210 are assembled. It has almost the same shape as 2.
- a portion of the inner peripheral wall of the spring accommodating portion 234 that is relatively located on the pulling-out direction side is a pressing wall 236, and the lock base 8 is disposed in a winding direction opposite to the pulling-out direction.
- the pressing wall 2 36 presses the spring box 2 28.
- the inner peripheral wall of the spring accommodating portion 234 on the winding direction side with respect to the intermediate portion of the spring accommodating portion 234 in the direction along the pull-out direction (winding direction) is mutually separated from the wall portion 238.
- a limiting recess 244 is formed by limiting walls 240 and 242 as opposed limiting portions.
- the dimension between the limiting wall 2 4 4 and the limiting wall 2 4 2 of the limiting recess 2 4 4 is slightly larger than the outer diameter of the compression coil spring 2 18, and the limiting wall 2 4 0 and the limiting wall 2
- the compression coil spring 218 can accommodate a part of the other end in the axial direction between the compression coil spring 218 and the compression coil spring 418.
- the wall portion 220 of the restriction recess portion 244 faces the wall portion 220 substantially along the longitudinal direction of the above-described insertion hole 216, and the V gear 210 and the lock base 8 In the assembled state of 2, and the compression coil spring 218, the other axial end of the compression coil spring 218 contacts.
- a well-known acceleration sensor 250 for VSIR (see FIG. 1) is provided below the V gear 210.
- FIG. 32 the illustration of the acceleration sensor 250 is omitted.
- the ball 255 as an inertial mass body of the acceleration sensor 250 rolls on the sensor housing 255 to swing the sensor lever 256 as a regulating member, and the sensor lever 2 5 6 Lock claw 2 5 6 A is V gear 2 10 Locking teeth 21A.
- the above-mentioned acceleration sensor 250 is held by a resin-made sensor filter 258.
- a resin sensor cover 260 having a shape similar to that of the sensor holder 258 is provided outside the sensor holder 258, and the sensor holder 258 and the sensor cover 260 are integrally formed. And fixed to the leg plate 24 of the frame 20. Further, a short cylindrical boss 255 A is formed on the shaft core of the sensor holder 255, and the boss 255 A is formed at the leading end 92 of the torsion shaft 92. It is supported by F.
- webbing take-up device 10 Next, the operation of webbing take-up device 10 according to the present embodiment will be briefly described.
- the occupant has a tinder plate (not shown) passed through the webbing, pulls out the webbing belt 68 from the spool 70 against the biasing force of the spiral coil springs 17 4, and engages the tundler plate with a buckle device (not shown).
- the occupant will be in the state of wearing the webbing of the three-point seat belt device.
- the webbing belt from the shoulder force (not shown) provided above the center pillar to the shoulder plate becomes the webbing belt on the shoulder side
- the webbing belt from the tinder plate to the buckle device becomes the webbing belt on the lap side.
- the lock housing 82 provided integrally with the spool 70 and the spring housing portion 2 3 of the spool 70 are provided.
- the wall 2 3 8 force which is a part of the inner peripheral wall of 4, tries to compress the other end of the compression coil spring 2 18 in the axial direction.
- the starting device in the gas generator 158 When the vehicle changes to a running state from this state and the vehicle suddenly decelerates, the starting device in the gas generator 158 operates and the gas generating agent burns through the explosive and burns extremely short. During the time, a predetermined amount of gas is generated and supplied into the cylinder body 1 36. The pressure of this gas causes the biston 1332 to slide in the direction away from the bottom of the cylinder body 1336, and the rack bar 128 to slide in the direction away from the bottom of the cylinder body 1336. With this slide movement, the rack bar 1 28 is engaged with the tooth 130 of the pinion 102 by the sliding movement, and further separated from the bottom of the cylinder body 1 36 by the gas pressure described above from this state.
- the teeth 13 of the rack bar 128 push the teeth 104 of the pinion 102 in the direction of the arrow X in FIG. 15 to rotate the pinion 102.
- the spool 70 integrated with the pinion 102 is rotated by a predetermined amount in the direction of winding the webbing belt 68, and the webbing belt 68 is wound up by a length corresponding to the rotation amount of the spool 70.
- the restraining force on the occupant's body by the webbing belt 68 is temporarily increased, and it is possible to limit the movement of the occupant to the front side of the vehicle when the vehicle is rapidly decelerating.
- the protruding portion 126 When 70 rotates, the protruding portion 126 cannot prevent the rotation of the clutch portion 106, and the protruding portion 126 forms a spool 7 due to frictional resistance with the outer peripheral portion of the clutch portion 106. While being dragged in the rotation direction of 0, the tip gradually deforms plastically in the rotation direction of the spool 70. Thus, in the present embodiment, when the clutch portion 106 rotates, the protruding portion 126 does not resist and is plastically deformed as described above, so that even if the spool 70 is eccentric, the spool 7 0 can rotate smoothly.
- the inner diameter of the bearing body 124 is slightly larger than the outer diameter of the clutch 106, and the clearance S (see FIG. 15), the spool 70 rotates while the above-mentioned pressing force is applied, and the plastically deformed portion of the protruding portion 126 from which the clutch portion 106 is dragged enters the gap S. Just by re-insertion, the plastically deformed portion does not become a resistance to the rotation of the clutch portion 106, and in this sense, the spool 70 can rotate smoothly.
- the spool 70 can rotate smoothly, so that the gas pressure in the cylinder body 13 36 is controlled by the clutch portion 106 and the protruding portion 126.
- the spool 70 is efficiently rotated without being consumed due to frictional resistance between the spool 70 and the shaft 70.
- it is possible to reduce the amount of the gas generating agent and the explosive charged in the gas generator 158, and to reduce the size of the gas generator 158 itself and, consequently, the size of the pretensioner 14. Contribute to cost reduction.
- the rack bar 128 moves upward due to the generation of gas in the cylinder body 13 36, the rack bar 128 moves more than a predetermined distance. 6 4 is limited by contact with the upper end of rack bar 1 28. As a result, the protrusion of the rack bar 128 is restricted.
- the cover 112 is formed of metal, the rigidity is higher than when the cover 112 is formed of a synthetic resin material, and the rack bar that reliably moves upward is formed. 128 can be received, and, for example, jumping out of the rack bar 128 can be prevented.
- the rack bar 128 engages the pinion 102
- the teeth 130 of the pinion 1 28 press the teeth 104 of the pinion 102 along the surface direction
- the reaction force from the teeth 104 of the pinion 102 naturally becomes a rack bar.
- the rack bar 1 2 8 is displaced to the opposite side of the pinion 1 0 2 by this pressing reaction force.
- the stopper portion 166 contacts the rack bar 128 to limit the displacement of the rack bar 128.
- the cover 112 is formed of metal, the rigidity is higher than when the cover 112 is formed of a synthetic resin material, and the pinion is formed. The load applied to the rack bar 128 from 102 can be reliably received by the stopper 166 force. As a result, good engagement between the rack bar 128 and the pinion 102 is ensured.
- the cover 112 since the cover 112 is formed of metal, the rigidity is higher than when the cover 112 is formed of a synthetic resin material.
- the shaft support of the shaft portion 88 can be made only by forming the bearing hole 170 in the hole 112. That is, when the cover 112 is formed of a synthetic resin material, the strength is insufficient, so that a bearing member formed of metal or the like must be separately provided, but in the present embodiment, the cover is not provided. Since the rigidity of the shaft is increased, the shaft 168 can be directly supported simply by forming the bearing hole 170. Therefore, costs can be reduced in terms of the number of parts and processing.
- the casing body 114 which constitutes the casing 116 together with the cover 112
- the casing 116 can be reduced in weight and the vehicle can travel. It is also possible to suppress or prevent generation of abnormal noise (hit sound) or the like caused by contact with other metal parts due to internal vibration or the like.
- the shape of the protrusion 1 26 is triangular. From the viewpoint of the invention, it is only necessary that the contact portion of the end of the protruding portion 126 with respect to the outer peripheral portion of the clutch portion 106 be extremely small, and therefore, it may be a point contact, or if the contact portion is extremely small, the surface contact May be.
- the protruding portion 126 is formed on the inner peripheral portion of the bearing body 124, but this is because the rigidity of the bearing body 124 is less than the rigidity of the clutch portion 106. Yori Is also high. That is, if the stiffness of the clutch portion 106 is lower than the stiffness of the bearing body 124, a protrusion corresponding to the protrusion 126 is formed on the outer periphery of the clutch portion 106.
- the guide bin 206D of the plate 206 is guided by the guide hole 214 of the V gear 210, and is moved substantially radially outward of the lock base 82.
- the lock teeth 206 C of the lock plate 206 mesh with the ratchet teeth 96 A of the ratchet hole 96 provided in the leg plate 2 of the frame 20.
- the reaction force at that time is reduced by the holding portion 8 2 C of the lock base 82. Act on. Since this reaction force is generated by the engagement of the high-strength lock teeth 206 C and the ratchet teeth 96 A during rapid deceleration of the vehicle, the reaction force is considerably large, and therefore, the reaction force penetrates the shaft core of the lock base 82. It naturally acts on the one-piece shaft 92.
- the reaction force is applied to the distal end portion 9 2 of the torque shaft 92. Acts on the boss 2 5 8 A of the sensor holder 2 58 from 2 F, and the sensor holder The boss 258 A of the 258 is elastically deformed in the direction of the reaction force, that is, in the direction opposite to the engagement position of the lock plate 206. Therefore, a part of the outer periphery of the holding portion 82C of the lock base 82 is pressed strongly against the ratchet teeth 96A of the ratchet hole 96 of the frame 20.
- the lock base 82 is manufactured by die-casting and is relatively soft.
- the lock base 82 when pressed into contact with the ratchet teeth 96A, the lock base 82 is plastically deformed and bites into the ratchet teeth 96A, directly. Engaged.
- a locked state can be obtained at two locations facing each other in the radial direction, so that sufficient locking strength can be ensured.
- the V gear 210 is rotated to follow the spool 70, and when the V gear 210 is locked, the V gear 210 is rotated relative to the spool 70.
- a compression coil spring 218 is used as a means. The procedure of assembling the compression coil spring 218 when assembling the webbing retractor 10 will be described below.
- the limiting walls 222, 224, 240, and 242 limit the displacement of the compression coil spring 218 at both ends of the compression coil spring 218. Therefore, both ends of the compression coil spring 218 are in a stable state.
- the conventional method does not have a boss. Therefore, in the conventional method, the opening for inserting the compression coil spring (the input hole 2 in the webbing retractor 10). Of the 16), a portion corresponding to the length from the base end to the tip of the boss is not required, so that the longitudinal dimension of the insertion hole 2 16 can be reduced. For this reason, it is possible to reliably prevent the compression coil spring 2 18 from coming off or coming off from the inlet hole 2 16.
- the compression coil spring 218 is compressed at the time of assembly by pressing the other end of the compression coil spring 218 in the axial direction against the wall 238.
- the compression coil spring 218 can be compressed only by applying a pressing force from one axial end of the compression coil spring 218, and the other end of the compression coil spring 218 in the axial direction can be compressed. No special support is required.
- the compression coil spring 218 can be easily assembled, and the compression coil spring 218 can be compressed only by applying a pressing force from one axial end of the compression coil spring 218. Therefore, the assembling process using a robot or the like can be automated.
- the engaging claw 186 is constantly urged upward by a restoring force based on the radial (elastic) deformation of the deformed portion 188, the claw portion 1 which has entered the hole 192 is formed. 8 4 does not separate. That is, it is possible to reliably prevent the cover 17 from rattling.
- the present webbing retractor 10 it is possible to improve the assemblability of the devices on the lock device 18 side and the urging portion 16 side, and thereby, the present webbing retractor 10 is improved. Manufacturing cost can be reduced. The invention's effect
- the pretensioner and the lock device can be reduced in size, the number of components can be reduced, and the cost can be reduced.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automotive Seat Belt Assembly (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR9917124-4A BR9917124A (pt) | 1999-02-16 | 1999-12-02 | Elemento retrator em um sistema de cinto de segurança |
EP99973692A EP1155928B1 (en) | 1999-02-16 | 1999-12-02 | Webbing take-up device |
AU14150/00A AU754709B2 (en) | 1999-02-16 | 1999-12-02 | Webbing take-up device |
CA002361712A CA2361712C (en) | 1999-02-16 | 1999-12-02 | Webbing take-up device |
DE69931962T DE69931962T8 (de) | 1999-02-16 | 1999-12-02 | Sicherheitsgurtaufroller |
AU2002301946A AU2002301946B2 (en) | 1999-02-16 | 2002-11-11 | Webbing retractor |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3709099 | 1999-02-16 | ||
JP11/37090 | 1999-02-16 | ||
JP11/112138 | 1999-04-20 | ||
JP11213899A JP3437486B2 (ja) | 1999-04-20 | 1999-04-20 | ウエビング巻取装置 |
JP12705099A JP3437488B2 (ja) | 1999-02-16 | 1999-05-07 | ウエビング巻取装置 |
JP11/127050 | 1999-05-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000048869A1 true WO2000048869A1 (fr) | 2000-08-24 |
Family
ID=27289323
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/006779 WO2000048869A1 (fr) | 1999-02-16 | 1999-12-02 | Enrouleur de ceinture de securite |
Country Status (11)
Country | Link |
---|---|
US (1) | US6354528B1 (ja) |
EP (1) | EP1155928B1 (ja) |
KR (1) | KR100580920B1 (ja) |
CN (1) | CN1128078C (ja) |
AU (1) | AU754709B2 (ja) |
BR (1) | BR9917124A (ja) |
CA (1) | CA2361712C (ja) |
DE (1) | DE69931962T8 (ja) |
ES (1) | ES2263300T3 (ja) |
TW (1) | TW476718B (ja) |
WO (1) | WO2000048869A1 (ja) |
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- 1999-12-02 BR BR9917124-4A patent/BR9917124A/pt not_active IP Right Cessation
- 1999-12-02 EP EP99973692A patent/EP1155928B1/en not_active Expired - Lifetime
- 1999-12-02 ES ES99973692T patent/ES2263300T3/es not_active Expired - Lifetime
- 1999-12-02 AU AU14150/00A patent/AU754709B2/en not_active Ceased
- 1999-12-02 CA CA002361712A patent/CA2361712C/en not_active Expired - Fee Related
- 1999-12-02 DE DE69931962T patent/DE69931962T8/de active Active
- 1999-12-02 CN CN99816205A patent/CN1128078C/zh not_active Expired - Fee Related
- 1999-12-02 WO PCT/JP1999/006779 patent/WO2000048869A1/ja active IP Right Grant
- 1999-12-27 KR KR1019990062716A patent/KR100580920B1/ko active IP Right Grant
-
2000
- 2000-02-14 US US09/503,720 patent/US6354528B1/en not_active Expired - Lifetime
- 2000-02-15 TW TW089102483A patent/TW476718B/zh not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
EP1155928A1 (en) | 2001-11-21 |
DE69931962T2 (de) | 2007-05-24 |
EP1155928A4 (en) | 2005-01-05 |
KR100580920B1 (ko) | 2006-05-16 |
CN1128078C (zh) | 2003-11-19 |
CA2361712C (en) | 2007-10-23 |
AU1415000A (en) | 2000-09-04 |
TW476718B (en) | 2002-02-21 |
DE69931962D1 (de) | 2006-07-27 |
ES2263300T3 (es) | 2006-12-01 |
US6354528B1 (en) | 2002-03-12 |
BR9917124A (pt) | 2001-11-06 |
CN1334771A (zh) | 2002-02-06 |
CA2361712A1 (en) | 2000-08-24 |
KR20000057103A (ko) | 2000-09-15 |
AU754709B2 (en) | 2002-11-21 |
EP1155928B1 (en) | 2006-06-14 |
DE69931962T8 (de) | 2007-09-20 |
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