A webbing retractor which can prevent gas, which is for rotating a take-up shaft in a take-up direction, from affecting other structural parts. In the webbing retractor, when a pretensioner mechanism operates, gas for operation within a cylinder is exhausted toward a pinion via a gas venting hole f
A webbing retractor which can prevent gas, which is for rotating a take-up shaft in a take-up direction, from affecting other structural parts. In the webbing retractor, when a pretensioner mechanism operates, gas for operation within a cylinder is exhausted toward a pinion via a gas venting hole formed in a flange portion of a piston. Because a blocking wall is provided between the pinion and an acceleration sensor, exhausted gas passes between the pinion and the blocking wall, and is exhausted to an outer side of the webbing retractor from an upper end side of a cover plate or the like. In this way, blowing-out of the exhausted gas onto the acceleration sensor is blocked, and the exhausted gas can be prevented from affecting the acceleration sensor.
대표청구항▼
What is claimed is: 1. A webbing retractor comprising: a take-up shaft rotatably mounted between two sides of said retractor around which a webbing for restraining a vehicle occupant is wound so as to be able to be taken-up thereon and pulled-out therefrom; an acceleration detecting mechanism provi
What is claimed is: 1. A webbing retractor comprising: a take-up shaft rotatably mounted between two sides of said retractor around which a webbing for restraining a vehicle occupant is wound so as to be able to be taken-up thereon and pulled-out therefrom; an acceleration detecting mechanism provided at one of said sides of the retractor, and detecting a moving acceleration of the webbing retractor and/or a pull-out acceleration of the webbing, and causing a lock member to engage with the take-up shaft on the basis of results of said detection; a pretensioner mechanism provided on the same one of said sides of the retractor and in a vicinity of the acceleration detecting mechanism, and having a piston disposed within a cylinder and movable along an axis by gas pressure toward an open end of the cylinder and rotating the take-up shaft in a take-up direction, wherein exhaust gases of said pretensioner mechanism are blown out of said open end of said cylinder; a cover plate housing said pretensioner mechanism, and a blocking wall provided between said open end of said cylinder and the acceleration detecting mechanism that directs exhausted gas blown out of said open end of said cylinder away from the acceleration detecting mechanism, wherein said cover plate has an open portion at a lower side thereof that is attached to one of said sides of said retractor, said pretensioner mechanism is accommodated between said one of said sides of said retractor and said cover plate, said blocking wall is positioned at the open portion of said cover plate, and the open portion of said cover plate is closed by said blocking wall except for a portion corresponding to said open end of the cylinder such that exhaust gas blown out from the open end of the cylinder is directed away from the acceleration detecting mechanism. 2. The webbing retractor of claim 1, wherein said blocking wall includes a curved shape portion and guides the gas so as to be exhausted along the curved shape portion. 3. The webbing retractor of claim 2, wherein the blocking wall further includes an edge extending from one end of the curved shape portion toward the open end of the cylinder so as to be closely adjacent to the open end of the cylinder. 4. The webbing retractor of claim 3, wherein the webbing retractor further comprises a pinion provided coaxially with the take-up shaft, and due to the pinion meshing together with a rack bar of the piston and being rotated at a time when the piston moves, the pinion rotates the take-up shaft, and the curved shape portion is curved around the pinion. 5. A webbing retractor comprising: a take-up shaft rotatably mounted between two sides of said retractor around which a webbing for restraining a vehicle occupant is wound so as to be able to be taken-up thereon and pulled-out therefrom; a lock member provided so as to be able to engage with the take-up shaft, the lock member impeding rotation of the take-up shaft in a pull-out direction in a state in which the lock member is engaged with the take-up shaft; an acceleration detecting mechanism provided at, and detecting a moving acceleration of the webbing retractor and/or a pull-out acceleration of the webbing, and causing the lock member to engage with the take-up shaft on the basis of results of detection; a pretensioner mechanism provided on the same one of said sides of the retractor in a vicinity of the acceleration detecting mechanism, and having a piston disposed within a cylinder and movable by gas pressure toward an open end of the cylinder and rotating the take-up shaft in a take-up direction, wherein exhaust gases of said pretensioner mechanism are blown out of said open end of said cylinder; a cover plate housing said pretensioner mechanism, and a blocking wall provided between said open end of said cylinder and the acceleration detecting mechanism that directs exhausted gas blown out of said open end of said cylinder away from the acceleration detecting mechanism, and having an edge closely adjacent to said open end of said cylinder, wherein said cover plate has an open portion at a lower side thereof that is attached to one of said sides of said retractor, said pretensioner mechanism is accommodated between said one of said sides of said retractor and said cover plate, said blocking wall is positioned at the open portion of said cover plate, and the open portion of said cover plate is closed by said blocking wall except for a portion corresponding to said open end of the cylinder such that exhaust gas blown out from the open end of the cylinder is directed away from the acceleration detecting mechanism. 6. A webbing retractor comprising: a take-up shaft around which a webbing for restraining a vehicle occupant is wound so as to be able to be taken-up thereon and pulled-out therefrom; an acceleration sensor provided at one axial direction side of the take-up shaft, and detecting a moving acceleration of the webbing retractor; a cylinder formed in a tube shape, and provided in a vicinity of the acceleration sensor, and having an open end; a piston having a flange portion, which is movably fit with an inner surface of the cylinder and in which is formed a gas venting hole which passes through from one side to the other side, and a rack bar, which extends toward the other side of the flange portion, and at a predetermined time, by gas being supplied to the one side of the flange portion within the cylinder, the piston moves toward the other side toward said open end of the cylinder while exhausting gas from the gas venting hole such that exhausting gas is ultimately blown out of the open end of the cylinder; a pinion provided coaxially with the take-up shaft, and due to the pinion meshing-together with the rack bar and being rotated at a time when the piston moves, the pinion connects with the take-up shaft and rotates the take-up shaft in a take-up direction; a cover plate housing said pretensioner mechanism, and a blocking wall provided between the pinion and the acceleration sensor, and having an edge closely adjacent to said open end of said cylinder, such that said wall directs exhausted gas away from the acceleration sensor and around a side of said pinion, wherein said cover plate has an open portion at a lower side thereof that is attached to one of said sides of said retractor, said pretensioner mechanism is accommodated between said one of said sides of said retractor and said cover plate, said blocking wall is positioned at the open portion of said cover plate, and the open portion of said cover plate is closed by said blocking wall except for a portion corresponding to said open end of the cylinder such that exhaust gas blown out from the open end of the cylinder is directed away from the acceleration detecting mechanism. 7. The webbing retractor of claim 6, wherein the blocking wall is formed integrally with a gear case which is formed of resin, which is provided between the take-up shaft and the pinion. 8. The webbing retractor of claim 6, wherein an edge of the blocking wall extends to the other side of the flange portion.
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이 특허에 인용된 특허 (9)
Elizabeth Rees GB; Alan George Smithson GB; David Burke GB; Andrew John Downie GB; Carlo Martellini GB; Richard Harman GB; David Blackadder GB, Buckle pretensioner.
Nilsson Karl Erik (Rontgenstr. 30 BOTH OF ; 8012 Ottobrunn DT) Herrmann Gunter (Rontgenstr. 24 BOTH OF ; 8012 Ottobrunn DT), Safety belt system with pyrotechnically driven turning device.
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