| 摘要 |
In a webbing take-up device 10, a worm gear 34, which is connected to a motor 44, engages with a gear wheel 32, and when the worm gear 34 rotates, driving force is transmitted via the gear wheel 32 and a clutch 26, whereby a take-up shaft 20 is rotated in a take-up direction. Helix angles of teeth of the worm gear 34 and the gear wheel 32 are set so that thrust force generated at this time along the axial direction of the gear wheel 32 faces a leg plate 16 fixed side of a case 30. Accordingly, because the thrust force acts on the leg plate 16 fixed side of the case 30, i.e., on a frame 12, there is no need to provide the case 30 or a cover clutch 31 with high strength and rigidity.
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