JP2013052730A - Seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt device capable of preventing friction and backlash between a wire casing and an angle detection part or a retractor.SOLUTION: This seat belt device 100 comprises: a retractor 108 having an acceleration sensor 116 and provided at a seat back 106 tiltable in a vehicle front-rear direction; an angle detection part 124 provided at a shaft member 126 tiltably supporting the seat back 106 and rotated while being interlocked with the seat back 106; a wire 132 connecting the angle detection part 124 with the retractor 108 and causing the posture of the acceleration sensor 116 to be interlocked with the rotation of the angle detection part 124; and a wire casing 134 covering a part of the wire 132 connected to the angle detection part 124. The angle detection part 124 includes a groove part 136 for fitting the wire casing 134, and the groove part 136 includes ribs 148a, 148b protruding toward the wire casing 134 at an inner wall 146 thereof.

Description

  The present invention relates to a seat belt device that is installed in a vehicle seat and restrains an occupant with a belt-shaped webbing.

  The seat belt device is a safety device for preventing a passenger from jumping forward due to inertial force when a large deceleration acts on the vehicle due to a sudden stop or a collision. The seat belt device restrains an occupant to a seat using belt-shaped webbing. The webbing is configured such that its root side is wound and accommodated on a retractor, and pulled out from the retractor by pulling a tongue plate provided on the tip side thereof. In recent years, a type of retractor that is built in the upper part of the seat, specifically, the upper side part of the seat back that is the backrest has become widespread.

  Many retractors have acceleration sensors. This acceleration sensor detects acceleration that has suddenly occurred in the vehicle, and is provided to prepare for an emergency such as a collision. The retractor is configured to fix the spindle (the shaft member that winds up the webbing) and to restrain the occupant by the webbing when the acceleration sensor detects a large acceleration (deceleration) that occurs at the time of collision.

  A general acceleration sensor has a structure that detects acceleration by movement of a built-in ball. In order for the acceleration sensor having such a structure to function normally, it is necessary to keep the posture set as the initial state constant regardless of the inclination angle of the seat back. Therefore, for example, in the retractor described in Patent Document 1, an angle detection unit is provided in a shaft member that is the center of the tilting operation of the seat back, and the rotation of the angle detection unit is transmitted to the retractor by a transmission unit (wire). By communicating, the attitude of the retractor including the acceleration sensor is adjusted according to the angle of the seat back.

JP 11-326362 A

  The transmission means described in Patent Document 1 has a configuration in which a wire is covered with a wire casing at least at an end portion thereof. And this wire casing is inserted in the angle detection means, and both members are connected. However, when a retractor having such a configuration is used, if friction or rattling occurs between the angle detection means and the wire casing as the angle detection means rotates, it becomes a source of abnormal noise. In addition, the holding position of the wire casing may change. This change in the holding position may cause an error in the feeding length of the wire and may cause the acceleration sensor function to be deteriorated by shifting the posture of the acceleration sensor that should be kept constant.

  In view of such problems, the present invention has a retractor having an acceleration sensor provided on a seat back, an angle detection unit that rotates together with the seat back, and a wire that links the attitude of the acceleration sensor of the retractor with the rotation of the angle detection unit. An object of the present invention is to provide a seat belt apparatus including a wire casing that covers the wire, and capable of preventing the occurrence of friction and backlash between the wire casing and the angle detection unit or the retractor.

  In order to solve the above-described problems, a typical configuration of a seat belt device according to the present invention includes a retractor provided on a seat back that has an acceleration sensor and can be tilted in the vehicle longitudinal direction, and supports the seat back so as to be tiltable. An angle detection unit that is provided concentrically with the seat back on the shaft member and rotates in conjunction with the tilting operation of the seat back, and the angle detection unit and the retractor are connected to link the attitude of the acceleration sensor to the rotation of the angle detection unit. The wire includes a wire and a wire casing that covers a portion of the wire that is connected to the angle detection unit. The angle detection unit includes a groove portion into which the wire casing is fitted, and the groove portion projects toward the wire casing on the inner wall thereof. It has a rib.

  Since the rib of the angle detection unit is provided with a rib, there is less room for the wire casing to move in the groove. Therefore, the occurrence of friction and backlash between the angle detection unit and the wire casing is suppressed, and the generation of abnormal noise and the deterioration of function can be prevented.

  In order to solve the above problems, another typical configuration of the seat belt device according to the present invention includes a retractor provided on a seat back that has an acceleration sensor and can be tilted in the vehicle longitudinal direction, and the seat back can be tilted. An angle detection unit that is provided concentrically with the seat back on the shaft member that supports the seat, and rotates in conjunction with the tilting operation of the seat back, and the angle detection unit and the retractor are connected, and the attitude of the acceleration sensor is adjusted to rotate the angle detection unit. The wire includes a wire to be interlocked and a wire casing that covers a portion of the wire that is connected to the retractor. The retractor further includes a groove portion into which the wire casing is fitted, and the groove portion is a rib that protrudes toward the wire casing on the inner wall thereof. It is characterized by having.

  Since the rib portion is provided in the groove portion of the retractor, there is less room for the wire casing to move in the groove portion. Therefore, the occurrence of friction and backlash between the retractor and the wire casing can be suppressed, and the generation of abnormal noise and the deterioration of the function can be prevented.

  The rib may have elasticity, and the wire casing may be fitted into the groove portion in contact with the rib. According to this configuration, since the wire casing can be gripped by the rib in the groove portion, it is possible to efficiently prevent friction and backlash between the inner wall of the groove portion and the wire casing.

  In order to solve the above problems, another typical configuration of the seat belt device according to the present invention includes a retractor provided on a seat back that has an acceleration sensor and can be tilted in the vehicle longitudinal direction, and the seat back can be tilted. An angle detection unit that is provided concentrically with the seat back on the shaft member that supports the seat, and rotates in conjunction with the tilting operation of the seat back, and the angle detection unit and the retractor are connected, and the attitude of the acceleration sensor is adjusted to rotate the angle detection unit. And a wire casing that covers a portion of the wire that is connected to the angle detection unit or the retractor. Each of the angle detection unit or the retractor includes a groove portion into which the wire casing is fitted. It has a rib protruding toward the inner wall.

  Since the wire casing is provided with ribs, there is less room for the wire casing to move in the groove. Therefore, the occurrence of friction and backlash between the retractor / angle detector and the wire casing is suppressed, and the generation of abnormal noise and the deterioration of the function can be prevented.

  The rib may have elasticity, and the wire casing may be fitted into the groove portion with the rib contacting the groove portion. According to this configuration, since the position of the wire casing can be fixed by the rib in the groove portion, it is possible to efficiently prevent friction and rattling between the inner wall of the groove portion and the wire casing.

  Said wire casing may have a predetermined flange part along the outer peripheral direction of an outer surface, and a groove part may have a recessed part which can engage | insert a flange part in the inner wall. When the flange portion is fitted into the recess, the wire casing is less likely to move in the longitudinal direction. Therefore, it is possible to further suppress the occurrence of friction and backlash between the wire casing and the inner wall of the groove.

  ADVANTAGE OF THE INVENTION According to this invention, the seatbelt retractor which can prevent generation | occurrence | production of friction and rattling between a wire casing, an angle detection part, and a retractor can be provided.

It is the figure which illustrated the seatbelt apparatus concerning 1st Embodiment of this invention. It is the figure which illustrated the retractor of FIG. 1 independently. It is an exploded view of the angle detection part of FIG. It is sectional drawing in each position of the angle detection part of FIG. It is a figure which illustrates the structure of the retractor of Fig.2 (a) further in detail. It is the figure which illustrated the seatbelt apparatus concerning 2nd Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(First embodiment)
FIG. 1 is a diagram illustrating a seat belt device 100 according to a first embodiment of the present invention. Some of the elements constituting the seat belt device 100 are installed inside the seat 102. The seat 102 is assumed to be a front seat of the vehicle, and includes a seat cushion 104 and a seat back 106. In particular, the seat back 106 is configured to be tiltable in the vehicle front-rear direction.

  The seat back 106 incorporates a retractor 108 included in the seat belt device 100. The retractor 108 is a part that winds and stores the belt-like webbing 110. Since the retractor 108 is built in the seat back 106, the position and posture of the retractor 108 change as the seat back 106 tilts.

  FIG. 2 is a diagram illustrating the retractor 108 of FIG. 1 alone. FIG. 2B shows the retractor 108 from the same direction as FIG. 1, and FIG. 2A shows the retractor 108 of FIG. 2B viewed from the front of the vehicle.

  As illustrated in FIG. 2A, the retractor 108 includes a frame 112 serving as a skeleton, and a spindle 114 is rotatably installed on the frame 112. The spindle 114 is a portion that becomes an axis when the webbing 110 (see FIG. 1) is wound.

  An acceleration sensor 116 is provided inside the retractor 108. The acceleration sensor 116 detects acceleration (deceleration) that occurs in an emergency such as a collision. The acceleration sensor 116 mainly includes a ball-shaped weight 118, a housing 120 that houses the weight 118, and a lever 122. The retractor 108 is configured to fix the spindle 114 through the lever 122 and the like when the weight 118 is moved by acceleration, thereby stopping the pulling out of the webbing 110 and restraining the occupant.

  In order for the acceleration sensor 116 having the above structure to function normally, the posture set as the initial state must always be kept constant. However, since the acceleration sensor 116 is provided inside the seat back 106 (see FIG. 1), the posture of the acceleration sensor 116 usually changes with the tilting operation of the seat back 106. Therefore, the seat belt device 100 illustrated in FIG. 1 includes an angle detection unit 124, and the attitude of the acceleration sensor 116 is kept constant by the action of the angle detection unit 124.

  As illustrated in FIG. 1, the angle detection unit 124 is attached to a shaft member 126 that supports the seat back 106 to be tiltable. Of the angle detection unit 124, the lever unit 128 is fixed to the seat cushion 104, but the case unit 130 is fixed to the seat back 106. The case portion 130 is provided concentrically with the seat back 106 with respect to the shaft member 126, and rotates in conjunction with the tilting operation of the seat back 106. The case unit 130 and the retractor 108 are connected by a wire 132, and the rotation of the case unit 130 is transmitted to the retractor 108 through the wire 132, and the posture of the acceleration sensor 116 is controlled in conjunction with the rotation. ing. Note that most of the region of the wire 132 is included in the outer tube 133 (see FIG. 3).

  FIG. 3 is an exploded view of the angle detector 124 of FIG. As illustrated in FIG. 3, a portion of the wire 132 connected to the case portion 130 is covered with a wire casing 134. The wire casing 134 is fitted into a groove 136 provided in the case part 130. An end portion 144 of the wire 132 is fixed to the cam 140 via an adjuster 138. The case portion 130 and the cam 140 are fixed to the seat back 106 (see FIG. 1) by the plate portion 142. On the other hand, the lever portion 128 is fixed to the seat back 106 as described above.

  When the seat back 106 (see FIG. 1) is tilted rearward of the vehicle, the case portion 130 and the cam 140 rotate together within a predetermined angle range. However, the cam 140 cannot rotate beyond a certain angular range. The end portion 144 of the wire 132 is fixed to the cam 140, and when the case portion 130 continues to rotate even after the cam 140 stops, the wire 132 is gradually pulled out of the wire casing 134 so as to be wound around the cam 140. When the wire 132 is wound around the cam 140 in this manner, the angle detection unit 124 is in a state of pulling the wire 132 with respect to the retractor 108 (see FIG. 1).

  On the other hand, the inside of the retractor 108 in FIG. 2 has a structure in which the posture of the acceleration sensor 116 changes in conjunction with the pulling of the wire 132. In particular, the degree of change in the attitude of the acceleration sensor 116 and the wire 132 at a predetermined inclination angle of the seat back 106 so that the attitude of the acceleration sensor 116 is always kept constant regardless of the inclination angle of the seat back 106 (see FIG. 1). The degree of pulling is adjusted to each other. In this way, the attitude of the acceleration sensor 116 is kept constant.

  The seat belt device 100 having the above-described configuration is further devised so that friction and backlash do not occur between the angle detection unit 124 and the wire casing 134. Hereinafter, the configuration of the seat belt device 100 will be further described with reference to FIG. 4.

  FIG. 4 is a cross-sectional view at each position of the angle detector 124 of FIG. 4A is a cross-sectional view taken along the line AA in the case portion 130 of FIG. As illustrated in FIG. 4A, the groove portion 136 of the case portion 130 has ribs 148 a and 148 b that protrude toward the wire casing 134 on the inner wall 146 thereof. In the present embodiment, the ribs 148a and 148b have a leaf spring structure so as to have elasticity, and the wire casing 134 is fitted into the groove portion 136 in contact with the ribs 148a and 148b. Thus, since the wire casing 134 is gripped from both sides by the ribs 148a and 148b in the groove 136, the wire casing 134 does not move. As a result, it is possible to efficiently prevent friction and backlash between the inner wall 146 of the groove 136 and the wire casing 134, and to prevent generation of abnormal noise and deterioration of function.

  Moreover, the wire casing 134 has the flange part 150 on the outer surface. The flange portion 150 is provided on the outer surface of the wire casing 134 along the outer circumferential direction. On the other hand, a recess 152 is provided in the inner wall 146 of the groove 136 so that the flange 150 can be fitted. Since the flange 150 is fitted in the recess 152, the possibility that the wire casing 134 moves in the longitudinal direction is reduced. Therefore, friction and backlash between the wire casing 134 and the inner wall 146 of the groove 136 can be further suppressed.

  In addition, the site | part which provides a rib is not restricted to the case part 130. FIG. For example, FIG. 4B is a BB cross-sectional view of the plate portion 142 of FIG. As illustrated in FIG. 4B, ribs 154 may be provided on the plate portion 142. Even when the wire casing 134 is gripped or pressed by the ribs 154, it is possible to suppress friction and backlash between the wire casing 134 and the inner wall 146 of the groove 136.

  The configuration described above is also adopted in the retractor 108 (see FIG. 2A). FIG. 5 is a diagram illustrating the configuration of the retractor 108 in FIG. 2A in more detail. FIG. 5A shows the retractor 108 from the same direction as FIG.

  As illustrated in FIG. 5A, a portion of the wire 132 that is connected to the case portion 154 of the retractor 108 is covered with a wire casing 156. The wire casing 156 is fitted into a groove 158 provided in the case portion 154.

  FIG. 5B is a partially enlarged view of FIG. As illustrated in FIG. 5B, also in the case portion 154 of the retractor 108, ribs 162 a and 162 b that protrude toward the wire casing 156 are provided on the inner wall 160 of the groove portion 158. The ribs 162a and 162b also have a leaf spring structure so as to have elasticity, and come into contact with and grip the wire casing 156 from both sides. Further, the wire casing 156 is provided with a flange portion 164, and the inner wall 160 of the groove portion 158 is provided with a recess 166 into which the flange portion 164 is fitted. Thus, also in the retractor 108, the possibility that the wire casing 156 moves in the groove portion 158 is reduced, and friction and backlash between the inner wall 160 and the wire casing 156 can be efficiently prevented, and abnormal noise is generated and the function is deteriorated. Is preventing.

(Second Embodiment)
FIG. 6 is a diagram illustrating a seat belt device 200 according to the second embodiment of the present invention. The seat belt device 200 illustrated in each drawing of FIG. 6 is different from the above-described first embodiment in that a rib is provided.

  FIG. 6A is a cross-sectional view illustrating the case portion 204 and the wire casing 206 of the angle detection unit 202 included in the seat belt device 200 corresponding to FIG. 4A. As illustrated in FIG. 6A, in the seat belt device 200, ribs 208 a and 208 b are provided on the wire casing 206. The wire casing 206 is a portion of the wire 132 that is fitted into the groove 210 of the angle detection unit 202, and the ribs 208 a and 208 b protrude toward the inner wall 212 of the groove 210. The ribs 208a and 208b have elasticity, and the wire casing 206 is fitted into the groove portion 210 with the ribs 208a and 208b contacting the inner wall 212. According to this configuration, since the position of the wire casing 206 can be fixed by the ribs 208a and 208b in the groove portion 210, friction and backlash between the inner wall 212 of the groove portion 210 and the wire casing 206 can be efficiently prevented. . This prevents the generation of abnormal noise and the deterioration of function.

  The wire casing 206 is provided with a flange portion 214. The flange portion 214 is provided along the outer peripheral direction of the outer surface of the wire casing 206. The groove part 210 has a concave part 216 into which the flange part 214 can be fitted in the inner wall 212, and the possibility that the wire casing 206 moves in the longitudinal direction is reduced by fitting the flange part 214 into the concave part 216. Therefore, it is possible to further suppress the occurrence of friction and backlash between the wire casing 206 and the inner wall 212 of the groove portion 210.

  FIG. 6B is a cross-sectional view showing the case portion 222 and the wire casing 224 of the retractor 220 included in the seat belt device 200 corresponding to FIG. 5B. The wire casing 224 is also provided with ribs 226a and 226b. The wire casing 224 is a portion of the wire 132 that is fitted into the groove 228 of the retractor 220, and the ribs 226 a and 226 b protrude toward the inner wall 230 of the groove 228. The ribs 226a and 226b have elasticity, and the wire casing 224 is fitted into the groove portion 228 with the ribs 226a and 226b contacting the inner wall 230. According to this configuration, since the position of the wire casing 224 can be fixed by the ribs 226a and 226b in the groove portion 228, the noise and noise between the inner wall 230 of the groove portion 228 and the wire casing 224 are prevented and noise is generated. And deterioration of function can be prevented.

  The wire casing 224 is also provided with a lunge portion 232, and the groove portion 228 is provided with a recess portion 234 into which the flange portion 232 can be fitted to the inner wall 230. Since the flange portion 232 is fitted into the recess 234, the possibility that the wire casing 224 moves in the longitudinal direction is reduced. Therefore, it is possible to further suppress the occurrence of friction and backlash between the wire casing 224 and the inner wall 230 of the groove 228.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the embodiments described above are preferred examples of the present invention, and other embodiments can be implemented by various methods. Can be carried out. The invention is not limited to the detailed shape, size, configuration, and the like of the components shown in the accompanying drawings unless otherwise specified in the present specification. In addition, expressions and terms used in the present specification are for the purpose of explanation, and are not limited thereto unless otherwise specified.

  Therefore, it is obvious for those skilled in the art that various changes and modifications can be conceived within the scope of the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  INDUSTRIAL APPLICABILITY The present invention can be used for a seat belt device that is installed in a vehicle seat and restrains an occupant with a belt-like webbing.

DESCRIPTION OF SYMBOLS 100 * 200 ... Seat belt apparatus, 102 ... Seat, 104 ... Seat cushion, 106 ... Seat back, 108 * 220 ... Retractor, 110 ... Webbing, 112 ... Frame, 114 ... Spindle, 116 ... Acceleration sensor, 118 ... Weight, 120 ... Housing, 122 ... Lever, 124/202 ... Angle detection part, 126 ... Shaft member, 128 ... Lever part, 130/204 ... Case part of angle detection part, 132 ... Wire, 134/156/206/224 ... Wire casing 136, 158, 210, 228 ... groove part, 138 ... adjuster, 140 ... cam, 142 ... plate part, 144 ... end part, 146, 160, 212, 230 ... inner wall, 148a, 148b, 162, 208a, 208b, 226a・ 226b ... Ribs, 150, 164, 214, 232 ... Flange parts, 152, 166, 216, 234 ... Recess parts, 154, 222 ... Retractor case parts,

Claims (6)

A retractor provided on a seat back having an acceleration sensor and tiltable in the vehicle longitudinal direction;
An angle detection unit that is provided concentrically with the seat back on a shaft member that supports the seat back in a tiltable manner and rotates in conjunction with the tilting operation of the seat back;
A wire that connects the angle detection unit and the retractor to interlock the posture of the acceleration sensor with the rotation of the angle detection unit;
A wire casing that covers a portion of the wire that is connected to the angle detection unit;
The angle detection unit has a groove part into which the wire casing is fitted,
The groove portion has a rib projecting toward the wire casing on an inner wall thereof. A retractor provided on a seat back having an acceleration sensor and tiltable in the vehicle longitudinal direction;
An angle detection unit that is provided concentrically with the seat back on a shaft member that supports the seat back in a tiltable manner and rotates in conjunction with the tilting operation of the seat back;
A wire that connects the angle detection unit and the retractor to interlock the posture of the acceleration sensor with the rotation of the angle detection unit;
A wire casing that covers a portion of the wire that is connected to the retractor;
The retractor further includes a groove portion into which the wire casing is fitted,
The groove portion has a rib projecting toward the wire casing on an inner wall thereof. The rib has elasticity,
The seat belt device according to claim 1 or 2, wherein the wire casing is fitted into the groove portion in contact with the rib. A retractor provided on a seat back having an acceleration sensor and tiltable in the vehicle longitudinal direction;
An angle detection unit that is provided concentrically with the seat back on a shaft member that supports the seat back in a tiltable manner and rotates in conjunction with the tilting operation of the seat back;
A wire that connects the angle detection unit and the retractor to interlock the posture of the acceleration sensor with the rotation of the angle detection unit;
A wire casing that covers a portion of the wire that is connected to the angle detector or the retractor;
The angle detection part or the retractor has a groove part into which the wire casing is fitted,
The said wire casing has a rib which protrudes toward the inner wall of the said groove part, The seatbelt apparatus characterized by the above-mentioned. The rib has elasticity,
5. The seat belt device according to claim 4, wherein the wire casing is fitted into the groove portion with the rib brought into contact with the groove portion. The wire casing has a predetermined flange portion along the outer peripheral direction of the outer surface,
The seat belt device according to any one of claims 1 to 5, wherein the groove portion has a recess capable of fitting the flange portion into an inner wall thereof.

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