Abstract: A seatbelt use determination device includes: a sensor section configured to detect insertion of a seatbelt tongue into a seatbelt buckle; a detection section configured to detect rotation of a take-up section for taking up a webbing; and a notification section that is configured to, when insertion of the tongue into the buckle has been detected by the sensor section, use a detection result of the detection section to determine a predetermined improper use of the webbing and to provide notification of the improper use. When insertion of the tongue into the buckle has been detected by the sensor section, the notification section is configured to determine improper use and to notify of the improper use in cases in which a time period during which a rotation change amount per unit time of the take-up section is continuously less than a predetermined value is longer than a predetermined first threshold.

Abstract: A webbing take-up device that includes a spool that is rotated in a take-up direction to take up webbing worn by an occupant and that is rotated in a pull-out direction by the webbing being pulled out, and a frame that rotatably supports the spool. The frame includes a fixed stay portion that is fixed to a vehicle body, and a rotation stop stay portion that is disposed spaced apart from the vehicle body and that by being engaged with the vehicle body is restricted from rotational displacement relative to the fixed stay portion.

Abstract: In a webbing take-up device, a cover member is disposed on the inner side of a second peripheral wall of a second housing member. Due thereto, an outer side surface of a third peripheral wall of the cover member and an inner side surface of the second peripheral wall of the second housing member oppose each other in a radial direction of urging, which is a radial direction of rotation of rotational urging force of a flat spiral spring, so displacement of the cover member outward in the radial direction of urging can be suppressed.

Abstract: A webbing take-up device includes clutch weights. The clutch weights are supported at the base and include engaging portions. The clutch weights move to a rotation diameter direction outer side when the base is rotated, and are capable of transmitting rotary force applied to the base to the spool. The webbing take-up device is provided with a stopper that is capable of relative rotating relative to the base and that is provided with engaged holes, each including an allowing portion and a restricting portion. The allowing portions allow movement of the engaging portions to the rotation diameter direction outer side when the base is rotating to one side. The restricting portions restrict movement of the engaging portions to the rotation diameter direction outer side when the base is rotating to the other side. The restricting portions are formed integrally with the allowing portions.

Abstract: A webbing take-up device that includes: a cut-off section that cuts off transmission of rotation load along a rotation force transmission route from a second rotation force transmission mechanism to a spool via a first rotation force transmission mechanism due to the rotation load in a pull-out direction becoming a predetermined value or greater; and a resistance section that resists the rotation load during transmission of the rotation load, and that suppresses transmission of the rotation load along the rotation force transmission route in a case in which the rotation load is less than the predetermined value.

Abstract: A webbing take-up device includes a spool on which a webbing worn by an occupant is taken up, and a motor that includes a rotation shaft and a first boss portion disposed coaxially with the rotation shaft. The webbing take-up device further includes an A-gear that is fixed to the rotation shaft, and a B-gear that meshes together with the A-gear and that is rotated by the A-gear being rotated such that the spool is rotated. The webbing take-up device further includes a gear housing that includes a B-gear support portion on which the B-gear is supported, and an engaged hole engaged by the first boss portion so as to have tightening margin therebetween, and to which the motor is fixed in a state in which the first boss portion has engaged with the engaged hole.

Abstract: In a webbing take-up device, an angle from one end portion toward another end portion of a second clutch spring in a direction of winding of a coil portion from the one end portion toward the another end portion of the second clutch spring is 270°. Therefore, in a case in which the one end portion of the second clutch spring is rotated toward a side of the direction of the winding of the coil portion, one end side portion of the second clutch spring is displaced so as to bulge-out toward a side opposite to a side toward which another end side portion bulges-out.

Abstract: A webbing take-up device includes a spool on which a webbing worn by an occupant is taken up, and a motor that includes a rotor with a rotation shaft and a motor housing covering part of the rotor, the rotor being urged toward one axial direction side of the rotation shaft with respect to the motor housing. The webbing take-up device further includes a second transmission mechanism that includes an A-gear fixed to the rotation shaft, and a B-gear meshed together with the A-gear and rotated by the A-gear being rotated toward one side together with the rotation shaft such that the spool is rotated. A helix angle of respective outer teeth of the A-gear is set such that an axial direction force toward the one axial direction side of the rotation shaft acts on the A-gear when the rotation shaft is rotated toward the one side.

Abstract: A webbing take-up device includes a spool, a motor that includes a rotation shaft, and an A-gear, a B-gear, a holder gear, an input gear, a clutch gear, an idle gear, and a spool gear that transmit rotation of the rotation shaft to the spool. The webbing take-up device further includes clutch weights that are moved toward a rotation-radial direction outside by being rotated together with the input gear such that rotation force of the input gear is transmitted to the clutch gear. Moreover, axial centers of rotations of the A-gear, the B-gear, the input gear and the clutch gear, and the idle gear are disposed between an axial center of rotation of the holder gear and an axial center of rotation of the spool gear.

Abstract: A webbing take-up controlling device including: a motor that is configured to operate a centrifugal clutch; and a controller that controls a voltage applied to the motor such that, in the case of operating the centrifugal clutch, a first voltage lower than a target voltage to operate the centrifugal clutch is applied to the motor, and then the target voltage is applied to the motor.

Abstract: In a webbing take-up device, a cover member is disposed on the inner side of a second peripheral wall of a second housing member. Due thereto, an outer side surface of a third peripheral wall of the cover member and an inner side surface of the second peripheral wall of the second housing member oppose each other in a radial direction of urging, which is a radial direction of rotation of rotational urging force of a flat spiral spring, so displacement of the cover member outward in the radial direction of urging can be suppressed.

Abstract: In a seatbelt device, when paying out webbing from a spool of a webbing take-up device to fit the webbing over the body of an occupant, drive of a first motor of the webbing take-up device is controlled based on the magnitude of a signal level of a load detection signal output by a load sensor according to the physical build of the occupant, and pulse data stored in a storage unit corresponding to each signal level of the load detection signal.

Abstract: There is provided a seat belt retrieval control device including: a drive unit that drives a retrieval of a webbing; and a setting unit that is configured to, when a vehicle attitude is being controlled by an attitude control unit that controls a vehicle attitude, set a retrieval load applied by the drive unit to a predetermined first load, and when the vehicle attitude is not being controlled by the attitude control unit, set the retrieval load to a second load that is greater than the first load.

Abstract: A webbing take-up device includes a spool that is rotated in a take-up direction to take up webbing worn by an occupant and that is rotated in a pull-out direction by the webbing being pulled out, and a frame that rotatably supports the spool. The frame includes a fixed stay portion that is fixed to a vehicle body, and a rotation stop stay portion that is disposed spaced apart from the vehicle body and that by being engaged with the vehicle body is restricted from rotational displacement relative to the fixed stay portion.

Abstract: A webbing take-up device that includes: a cut-off section that cuts off transmission of rotation load along a rotation force transmission route from a second rotation force transmission mechanism to a spool via a first rotation force transmission mechanism due to the rotation load in a pull-out direction becoming a predetermined value or greater; and a resistance section that resists the rotation load during transmission of the rotation load, and that suppresses transmission of the rotation load along the rotation force transmission route in a case in which the rotation load is less than the predetermined value.

Abstract: A webbing take-up device includes clutch weights. The clutch weights are supported at the base and include engaging portions. The clutch weights move to a rotation diameter direction outer side when the base is rotated, and are capable of transmitting rotary force applied to the base to the spool. The webbing take-up device is provided with a stopper that is capable of relative rotating relative to the base and that is provided with engaged holes, each including an allowing portion and a restricting portion. The allowing portions allow movement of the engaging portions to the rotation diameter direction outer side when the base is rotating to one side. The restricting portions restrict movement of the engaging portions to the rotation diameter direction outer side when the base is rotating to the other side. The restricting portions are formed integrally with the allowing portions.

Abstract: A webbing take-up device includes a second clutch that transmits rotation of a motor to a spool. The second clutch includes a base including a first spring catch portion, a clutch gear, a clutch spring including a coil portion, having an end portion at one side caught to the first spring catch portion, and a lever that includes a second spring catch portion catching an end portion at another side of the clutch spring, and that enlarges diameter of the coil portion to abut the clutch gear by moving the end portion at the another side of the clutch spring toward one side in the circumferential direction of the base. A terminal end of the end portion at the one side of the clutch spring abuts the first spring catch portion when the lever is rotated toward the one side in the circumferential direction of the base.

Abstract: A webbing take-up device includes a spool that takes up webbing worn by an occupant, an input gear that is rotated by rotation force being transmitted, a spool gear that rotates the spool by being rotated, and a second clutch that is provided between the input gear and the spool gear, and that transmits rotation force of the input gear to the spool gear by being rotated by the input gear. The webbing take-up device further includes a sub clutch spring that is provided between the input gear and the second clutch, that transmits rotation force of the input gear to the second clutch when the input gear is rotated toward one side, and that shuts off transmission of rotation force of the input gear to the second clutch when the input gear is rotated toward another side.

Abstract: An air belt device is provided with a webbing that is fitted around a vehicle occupant who is sitting in a vehicle seat, and an airbag portion that is provided in parallel with the webbing and is inflated and deployed when gas is supplied to an interior thereof. The airbag is provided with a reference portion that forms a portion of the airbag and is formed as a result of the airbag being folded. The airbag is also provided with a slack portion that forms another portion of the airbag and is formed as a result of the airbag being folded, and that extends in parallel with the reference portion and whose dimension in the transverse direction of the webbing is set longer than a dimension in the transverse direction of the webbing of the reference portion.

Abstract: In a seatbelt device, at a time of an emergency of a vehicle, gas is supplied via a tube interior into a chest bag, and the chest bag is inflated and expanded. Here, the tube is disposed at a thickness direction one side of a webbing at positions at which a lap webbing, at a thickness direction other side thereof, is interfered with by a seat cushion and a passenger. Therefore, the tube being crushed by the seat cushion and the passenger, and the lap webbing, can be suppressed, and supplying of gas via the tube interior into the chest bag being limited can be suppressed.