US-12617371-B2 - Webbing take-up device

US12617371B2US 12617371 B2US12617371 B2US 12617371B2US-12617371-B2

Abstract

In a pipe, a first corner portion, a second corner portion, and a third corner portion are formed sequentially from a guide direction upstream stream as a result of an axial direction intermediate portion of the pipe being bent in three places. The first corner portion and the second corner portion are bent in a substantially identical plane, and the third corner portion is bent in a direction deviating from the substantially identical plane. The radius of curvature of the third corner portion is set larger than the radius of curvature of the first corner portion.

Inventors

Yuta Suzuki
Yoshiteru SAKAGUCHI
Tomoya YOKOI
Yuta Fukuwa
Junichi MURANAKA
Kengo Chujo

Assignees

KABUSHIKI KAISHA TOKAI-RIKA-DENKI-SEISAKUSHO

Dates

Publication Date: 20260505
Application Date: 20240523
Priority Date: 20230530

Claims (8)

1 . A webbing take-up device comprising: a spool onto which a webbing of a seat belt device is taken up due to the spool being rotated in a take-up direction; a rotating member that is provided with biting portions, the spool being rotated in the take-up direction due to the rotating member being rotated to one side; a moving member that is made of resin, that is formed in an elongated shape, and that causes the rotating member to rotate to the one side due to the moving member being moved to a distal end side in an axial direction of the moving member and the biting portions biting the moving member; and a guide member that is formed in a tubular shape, and that guides movement of the moving member, an intermediate portion in an axial direction of the guide member being bent in three places such that a first corner portion, a second corner portion, and a third corner portion sequentially from an upstream side toward a downstream side in a guide direction are formed, wherein: the first corner portion and the second corner portion are bent on a substantially identical plane, and the third corner portion is bent in a direction deviating from the substantially identical plane, and a radius of curvature of the third corner portion is set larger than a radius of curvature of the first corner portion.
2 . The webbing take-up device of claim 1 , wherein the radius of curvature of the second corner portion is equal to or larger than the radius of curvature of the first corner portion, and a radius of curvature of the third corner portion is set larger than the radius of curvature of the second corner portion.
3 . The webbing take-up device of claim 2 , wherein the guide member is set so that, as viewed in a direction in which the third corner portion and the second corner portion are connected, an angle formed by a first extension portion linearly extending from a first corner portion side to a second corner portion side and a second extension portion linearly extending from a third corner portion side to the downstream side in the guide direction is an acute angle.
4 . The webbing take-up device of claim 1 , wherein the guide member is set so that, as viewed in a direction in which the third corner portion and the second corner portion are connected, an angle formed by a first extension portion linearly extending from a first corner portion side to a second corner portion side and a second extension portion linearly extending from a third corner portion side to the downstream side in the guide direction is an acute angle.
5 . The webbing take-up device of claim 1 , wherein the intermediate portion in the axial direction of the guide member is bent in the three places such that a first curved portion is formed at the first corner portion, a second curved portion is formed at the second corner portion, and a third curved portion is formed at the third corner portion, and a radius of curvature of the third curved portion is set larger than a radius of curvature of the first curved portion.
6 . A webbing take-up device comprising: a spool onto which a webbing of a seat belt device is taken up due to the spool being rotated in a take-up direction; a rotating member that is provided with biting portions, the spool being rotated in the take-up direction due to the rotating member being rotated to one side; a moving member that is made of resin, that is formed in an elongated shape, and that causes the rotating member to rotate to the one side due to the moving member being moved to a distal end side in an axial direction of the moving member and the biting portions biting the moving member; and a guide member that is formed in a tubular shape, and that guides movement of the moving member, an intermediate portion in an axial direction of the guide member being bent in three places such that a first corner portion, a second corner portion, and a third corner portion sequentially from an upstream side toward a downstream side in a guide direction are formed, wherein: the first corner portion and the second corner portion are bent on a substantially identical plane, and the third corner portion is bent in a direction deviating from the substantially identical plane, and a radius of curvature of the second corner portion is set larger than a radius of curvature of the first corner portion.
7 . The webbing take-up device of claim 6 , wherein the guide member is set so that, as viewed in a direction in which the third corner portion and the second corner portion are connected, an angle formed by a first extension portion linearly extending from a first corner portion side to a second corner portion side and a second extension portion linearly extending from a third corner portion side to the downstream side in the guide direction is an acute angle.
8 . The webbing take-up device of claim 6 , wherein the intermediate portion in the axial direction of the guide member is bent in the three places such that a first curved portion is formed at the first corner portion, a second curved portion is formed at the second corner portion, and a third curved portion is formed at the third corner portion, and a radius of curvature of the second curved portion is set larger than a radius of curvature of the first curved portion.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims priority under 35 USC 119 from Japanese Patent Application No. 2023-088904 filed on May 30, 2023, the disclosure of which is incorporated by reference herein in its entirety. BACKGROUND Technical Field The present disclosure relates to a webbing take-up device where a spool is rotated in a take-up direction as a result of a moving member that is elongated and made of resin being moved to an axial direction distal end side. Related Art Japanese Patent Application Laid-open (JP-A) No. 2018-103947 discloses a retractor where, at the time of an emergency, a plastically deformable elongated resin component is guided in a pipe and pushed out from the pipe, whereby a spool is rotated and a webbing is taken up onto the spool. The pipe is bent in a substantially U shape in plan view on the upper side of a base frame and is further bent downward, thereby ensuring length for the pipe. Here, in this retractor, sliding loss occurs because the elongated resin component passes through a corner portion inside the pipe, and there is room for improvement in terms of reducing sliding loss when the elongated resin component moves. SUMMARY In consideration of the above circumstances, the present disclosure obtains a webbing take-up device that can reduce sliding loss when a moving member that is elongated and made of resin is guided and moves in a guide member. A webbing take-up device of a first aspect of the disclosure includes: a spool onto which a webbing of a seat belt device is taken up due to the spool being rotated in a take-up direction; a rotating member that is provided with biting portions, the spool being rotated in the take-up direction due to the rotating member being rotated to one side; a moving member that is made of resin, that is formed in an elongated shape, and that causes the rotating member to rotate to the one side due to the moving member being moved to a distal end side in an axial direction of the moving member and the biting portions biting the moving member; and a guide member that is formed in a tubular shape, and that guides movement of the moving member, an intermediate portion in an axial direction of the guide member being bent in three places such that a first corner portion, a second corner portion, and a third corner portion sequentially from an upstream side toward a downstream side in a guide direction are formed, wherein: the first corner portion and the second corner portion are bent on a substantially identical plane, and the third corner portion is bent in a direction deviating from the substantially identical plane, and a radius of curvature of the third corner portion is set larger than a radius of curvature of the first corner portion. A webbing take-up device of a second aspect of the disclosure includes: a spool onto which a webbing of a seat belt device is taken up due to the spool being rotated in a take-up direction; a rotating member that is provided with biting portions, the spool being rotated in the take-up direction due to the rotating member being rotated to one side; a moving member that is made of resin, that is formed in an elongated shape, and that causes the rotating member to rotate to the one side due to the moving member being moved to a distal end side in an axial direction of the moving member and the biting portions biting the moving member; and a guide member that is formed in a tubular shape, and that guides movement of the moving member, an intermediate portion in an axial direction of the guide member being bent in three places such that a first corner portion, a second corner portion, and a third corner portion sequentially from an upstream side toward a downstream side in a guide direction are formed, wherein: the first corner portion and the second corner portion are bent on a substantially identical plane, and the third corner portion is bent in a direction deviating from the substantially identical plane, and a radius of curvature of the second corner portion is set larger than a radius of curvature of the first corner portion. A webbing take-up device of a third aspect of the disclosure is the webbing take-up device of the first aspect of the disclosure, wherein the radius of curvature of the second corner portion is equal to or larger than the radius of curvature of the first corner portion, and a radius of curvature of the third corner portion is set larger than the radius of curvature of the second corner portion. A webbing take-up device of a fourth aspect of the disclosure is the webbing take-up device of any one of the first to third aspects of the disclosure, wherein the guide member is set so that, as viewed in a direction in which the third corner portion and the second corner portion are connected, an angle formed by a first extension portion linearly extending from a first corner portion side to a second corner portion side and a second extension portion linearly extending from