JP2009023488A - Seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat belt device having a switching mechanism of a smaller and simpler structure to improve impact resistance and durability. <P>SOLUTION: This seat belt device has a regulation means for regulating moving of a switch lever 42 performing a switch of a switch assembly 41 switched by the switch lever 42. The regulation means is formed in a hook part 60 formed in a bearing plate 17 and the switch lever 42, and has a window hole part 49 to which the hook part 60 is engaged. An inclined sliding surface 52 on which the hook part 60 slides is formed on a surface around the window hole part 49 of the switch lever 42. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seat belt device.

As a conventional seat belt device, there has been proposed a structure including a switching mechanism for operating pyrotechnics so as to restrict the torsion amount of the torsion bar at the time of collision in two stages according to the occupant's physique and the like ( For example, see Patent Document 1). The switching mechanism described in Patent Document 1 performs a switching operation by a switching pin coming into contact with an outer shape at a position different from a portion where the reduction gear of the switching gear meshes.
JP-T-2004-521016

  By the way, in the above switching mechanism, the switching operation is performed by the outer shape of the switching gear meshing with the reduction gear, so that the switching gear may be enlarged, and ON / OFF switching such as detection of the seat belt wearing state is possible. In this case, a switching mechanism having a smaller and simple structure is required. Further, since the switching operation is frequently performed by wearing a seat belt or the like, the switching mechanism is required to be improved in impact resistance and durability.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a seat belt device having a switching mechanism that has a more compact and simple structure and has improved impact resistance and durability. It is to provide.

The object of the present invention is achieved by the following configurations.
(1) a rotatable spindle around which the webbing is wound;
In a seat belt apparatus comprising an automatic lock mechanism connected to a spindle via a predetermined transmission mechanism and preventing rotation of the spindle when a predetermined amount of webbing wound around the spindle is pulled out,
A drive gear to which the rotation of the spindle is transmitted;
A first gear pivotally supported so as to be movable relative to the shaft of the drive gear;
A transmission member supported at the end by the housing and movable by the first gear;
A moving means interposed between the drive gear and the first gear to relatively move the shaft of the drive gear and the shaft of the first gear;
Switch means switched by a transmission member;
A hook portion formed on the housing, and a restricting means formed on the transmission member, having a window hole portion with which the hook portion engages, and restricting movement of the transmission member;
With
An inclined sliding surface on which the hook portion slides is formed around a window hole portion of the transmission member.

(2) The seat belt device according to (1), wherein the inclined sliding surface has a curved surface shape.
(3) The seat belt device according to (1) or (2), wherein the inclined sliding surface is formed on one end side from an intermediate portion of the window hole portion in a movable direction of the transmission member. .
(4) Any one of (1) to (3), wherein the inclined sliding surface has a shape that changes a length in a short side direction of the window hole portion along a swinging direction of the transmission member. A seat belt device according to claim 1.
(5) The inclined sliding surface has a shape that changes a thickness of the transmission member along a swinging direction of the transmission member on a surface around the window hole portion. (3) The seatbelt apparatus in any one of.

  According to the seat belt device of the present invention, the drive gear to which the rotation of the spindle is transmitted, the first gear that is pivotally supported so as to be movable relative to the shaft of the drive gear, and the end portion are supported by the housing, A transmission member movable by the first gear, a moving means interposed between the drive gear and the first gear to relatively move the shaft of the drive gear and the shaft of the first gear, and a transmission member By providing the switch means that can be switched, a switching mechanism having a smaller and simpler structure is provided. Further, the seat belt device of the present invention includes a hook portion formed in the housing, and a restricting means that is formed in the transmission member, has a window hole portion that engages with the hook portion, and restricts the movement of the transmission member. In addition, an inclined sliding surface on which the hook portion slides is formed around the window hole portion of the transmission member. As a result, the transmission member can be moved in a restricted range by the relative movement between the shaft of the drive gear and the shaft of the first gear by the moving means, and the switching of the switch means can be performed more reliably. When the hook portion slides on the inclined sliding surface, the force of moving the transmission member by the switching operation can be relaxed, and the impact resistance and durability of the housing and the transmission member can be improved.

  Furthermore, in the seat belt device of the present invention, the inclined sliding surface may have a curved surface shape. Thereby, the force which a transmission member moves by switching operation | movement can also be relieve | moderated more efficiently. Further, the inclined sliding surface may be formed on one end side from the intermediate portion of the window hole portion in the movable direction of the transmission member. Thereby, this force can be relieved more efficiently on the side where a large force is generated when the transmission member is moved by the switching operation.

  In addition, the inclined sliding surface of the present invention may have a shape in which the length in the short side direction of the window hole portion is changed along the swinging direction of the transmission member, and the transmission member is formed on the surface around the window hole portion. The thickness of the transmission member may be changed along the swinging direction, and in any case, the force that the transmission member moves by the switching operation can be efficiently reduced.

  Hereinafter, a seat belt device according to an embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, a seat belt retractor 10 that is a seat belt device according to an embodiment of the present invention includes a retractor frame 11, and a spindle 12 that winds webbing (not shown) around the retractor frame 11. Is rotatably supported.

  A retractor spring 13 that urges the spindle 12 in the seat belt winding direction is attached to the retractor frame 11 by a holder 14 and a cover 15 at one end side in the axial direction of the spindle 12.

  The other end side of the spindle 12 in the axial direction is provided in the seat belt retractor 10 so as to be tiltable about a horizontal axis, and in an acceleration sensor 16 for detecting the acceleration in the horizontal direction of the vehicle, and in a bearing plate 17 which is a housing. It is arranged and connected to an inertial body assembly 18 that locks the pull-out operation of the seat belt according to the acceleration detected by the acceleration sensor 16 via a predetermined transmission mechanism, and operates when a predetermined amount of webbing is pulled out. Then, an automatic lock mechanism (ALR) 19 that prevents rotation of the spindle 12 in the webbing pull-out direction under normal conditions and a switching mechanism 20 (so-called reminder switch) are provided, and these are accommodated by the cover 21. .

  As shown in FIGS. 1 and 2, the automatic lock mechanism 19 includes a drive gear 30 to which the rotation of the spindle 12 is transmitted and an ALR lever 31 that is swingably supported by the bearing plate 17 as a predetermined transmission mechanism. And an automatic lock mechanism assembly 34 including two ALR gears 32 and 33 rotatably supported by the ALR lever 31, and a ratchet of the inertial body assembly 18 in response to the swing of the ALR lever 31. It has a pawl 35 that engages and disengages the wheel 18a.

  A fan-shaped first protrusion 30a, which is a moving means, is provided on the side surface of the drive gear 30, and an ALR engagement that can contact the first protrusion 30a is provided on the side surfaces of the ALR gears 32 and 33. A combination protrusion 32a and an ALR release protrusion 33a are provided. When a predetermined webbing pull-out operation is performed, the first protrusion 30a and the ALR engagement protrusion 32a come into contact with each other, so that the ALR lever 31 swings and the pawl 35 is engaged with the ratchet wheel 18a. The lock state is assumed. On the other hand, when a predetermined webbing take-up operation is performed, the first protrusion 30a and the ALR release protrusion 33a come into contact with each other, so that the ALR lever 31 swings and the pawl 35 is detached from the ratchet wheel 18a. It will be unlocked.

  The switching mechanism 20 includes the drive gear 30, the switch assembly 41 that is a switch unit that outputs an ON / OFF signal according to whether the belt is mounted or not, and a first position for switching the switch assembly 41. The switch lever 42, which is a transmission member that can swing to the switch OFF position that is the second position and the switch ON position that is the second position, and the drive gear 30, and a shaft that is movable relative to the axis of the drive gear 30 The first switch gear 43 that is the first gear to be supported, the second switch gear 44 that is the second gear that meshes with the first switch gear 43, and the bearing plate 17. , And a coil spring 45 that is an urging means that is engaged with the switch lever 42 and urges the switch lever.

  A second protrusion 43 a is formed on the side surface of the first switch gear 43, and a third protrusion 44 a is formed on the side surface of the second switch gear 44. The portion 30a and the second protrusion 43a are interposed between the drive gear 30 and the first switch gear 43 so that the shaft 30b of the drive gear 30 and the shaft 43b of the first switch gear 43 are relative to each other. The second projecting portion 43a and the third projecting portion 44a are interposed between the second switch gear 44 and the first switch gear 43 so as to move to the second switch. The second moving means is configured to relatively move the shaft 44b of the gear 44 for use and the shaft 43b of the first switch gear 43.

  The second protrusion 43a is formed to have the same shape as the teeth of the first switch gear 43, and the first protrusion 30a and the third protrusion 44a are located between the teeth of the drive gear 30a. The second switch gear 44 is provided between the teeth of the second switch gear 44 so as to contact the second protrusion 43a.

  As shown in FIGS. 2 and 4, the switch lever 42 is supported at its one end 46 so as to be swingable by the bearing plate 17, and extends from the one end 46 in a substantially V shape. 48. One extending portion 47 supports the first switch gear 43 at the intermediate portion thereof, and the shaft 43 b of the first switch gear 43 is relatively moved by the drive gear 30. The lever 42 swings around the one end 46. Further, a locking projection 50 for locking one end of the coil spring 45 is formed at the other end portion of the extending portion 47, and a window hole portion 49 is formed along the swinging direction of the switch lever 42. In addition, the hook portion 60 formed on the bearing plate 17 is engaged with the window hole portion 49 to constitute a restricting means for restricting the movement of the switch lever 42. Further, the other end portion of the other extending portion 48 is formed so as to come into contact with the pin 41 a of the switch assembly 41 by swinging of the switch lever 42.

  As shown in FIGS. 4 and 5, a pair of wall portions 51 are erected on one extension portion 47 of the switch lever 42 around the window hole portion 49 and in the vicinity of the locking projection 50. Further, an inclined sliding surface 52 on which the hook portion 41 slides is provided on the surface around the window hole portion 49 of the switch lever 42 from an intermediate portion of the window hole portion 49 in the movable direction (swinging direction) of the switch lever 42. It is formed on one end side. The inclined sliding surface 52 is formed to be inclined with respect to the surface around the window hole portion 48 so as to gradually increase the thickness from the intermediate portion of the window hole portion 49 toward the wall portion 51.

  The hook portion 60 has an engagement protrusion 61 that rises from the surface of the bearing plate 17 toward the switch lever 42 and rises from the surface, and a sliding portion 62 that extends in a direction intersecting the engagement protrusion 61. Thus, it is formed in a substantially L shape. The engaging protrusion 61 passes through the window hole 49, and the sliding part 62 faces the surface around the window hole 49 and allows the inclined sliding surface 52 to slide.

Next, the switching operation of the switching mechanism 20 will be described with reference to FIGS.
As shown in FIG. 2, during the webbing pull-out operation, the first protrusion 30a of the drive gear 30 and the second protrusion 43a of the first switch gear 43 are in contact with each other at the position where the predetermined amount is pulled out. Touch. Then, the switch lever 42 swings around the one end portion 46, exceeds the dead point of the coil spring 45, and the switch lever 42 moves to the switch ON position. As a result, the other end portion of the extending portion 48 of the switch lever 42 presses the pin 41a of the switch assembly 41, thereby switching the switching mechanism 20 to ON.

  On the other hand, as shown in FIG. 3, during the webbing take-up operation, the second protrusion 43a of the first switch gear 43 and the second switch at a position where a predetermined amount of the webbing is taken up. The third protrusion 44a of the gear 44 abuts. Then, the switch lever 42 swings around the one end portion 46, exceeds the dead point of the coil spring 45, and the switch lever 42 moves to the switch OFF position. Thereby, the other end part of the extension part 48 of the switch lever 42 cancels | releases the press with the pin 41a of the switch assembly 41, and switches the switching mechanism 20 to OFF. Therefore, the switching mechanism 20 can detect the presence or absence of the seat belt based on the state of the switch assembly 41.

  Further, in the present embodiment, in the state of FIG. 3, the switch lever 42 moves to the switch OFF position beyond the switching point of the coil spring 45 after the second protrusion 43 a and the third protrusion 44 a abut. During this time, the first protrusion 30a of the drive gear 30 of the automatic lock mechanism 19 and the ALR release protrusion 33a of the second ALR gear 33 come into contact with each other to prevent the spindle 12 from rotating in the webbing pull-out direction. To cancel.

  Here, in the present embodiment, when the switch lever 42 moves beyond the dead point of the coil spring 45 to the switch OFF position, the sliding portion 62 of the hook portion 60 slides on the inclined sliding surface 52. The moving speed of the lever 42 is reduced by reducing the moving force. For this reason, the contact force when the hook part 60 contacts the window hole part 49 and the wall part 51 is reduced, and the impact resistance and durability of the bearing plate 17 and the switch lever 42 can be improved.

  Further, since the sliding portion 62 of the hook portion 60 slides on the inclined sliding surface 52 and the moving speed of the switch lever 42 can be reduced, the hook portion 60 can be moved to the window without changing the urging force of the coil spring 45. It is possible to reduce the operating sound (sounding sound) that occurs when contacting the hole 49 and the wall 51. For example, when there is no inclined sliding surface 52, the operating sound was 89.1 dB, but by providing the inclined sliding surface 52, it was possible to reduce it to 76.5 dB.

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

  The surface of the inclined sliding surface 52 may be a flat surface as in this embodiment, but may be at least partially curved as shown in FIG. Further, as shown in FIG. 6B, the surface of the inclined sliding surface 52 may be continuously formed up to the wall portion 51. In this case, when the hook portion 60 collides with the wall portion 51, The impact force is alleviated and the strength of the wall 51 is improved, so that the impact resistance and durability of the switch lever 42 can be further improved.

  Further, in the above embodiment, the inclined sliding surface is formed on the surface around the window hole portion 49, but as shown in FIG. 7, the inclined sliding surface 52 a is formed on the inner surface around the window hole portion 49. May be. That is, the inclined sliding surface 52a is at one end side from the intermediate portion of the window hole portion 49 in the swing direction of the switch lever 42, and the length of the short side direction of the window hole portion 49 is along the swing direction of the switch lever 42. It has a shape that is changed, that is, gradually shortened.

  Also in this case, the movement speed of the switch lever 42 can be reduced by sliding the side surface of the engagement protrusion 61 of the hook portion 60 with the inclined sliding surface 52a. It is possible to reduce the operation sound (sounding sound) generated in the sound. Further, since the side surface of the engaging protrusion 61 of the hook portion 60 slides with the inclined sliding surface 52a, the hook portion 60 can be designed without providing the sliding portion 62 as shown in FIG. .

It is a disassembled perspective view for demonstrating the component of the seatbelt apparatus which is one Embodiment of this invention. (A) is a figure which shows the state which a 1st protrusion and a 2nd protrusion contact | abut at the time of webbing extraction | drawer operation | movement, (b) is sectional drawing along the II-II line of (a). It is. (A) is a figure which shows the state which the 2nd protrusion and 3rd protrusion contact | abut at the time of winding operation of webbing, (b) is a cross section along the III-III line of (a). FIG. It is a perspective view which shows a bearing plate and a switch lever. (A) is a principal part perspective view of a switch lever, (b) is a principal part front view, (c) is sectional drawing along the VV line of (b). (A) is sectional drawing which shows the 1st modification of an inclined sliding surface, (b) is sectional drawing which shows the 2nd modification of an inclined sliding surface. It is a principal part front view which shows the 3rd modification of an inclined sliding surface.

Explanation of symbols

10 Seat belt retractor (seat belt device)
12 spindle 20 switching mechanism 30 drive gear 30a first protrusion 42 switch lever 43 first switch gear 43a second protrusion 44 second switch gear 44a third protrusion 49 window hole 51 wall 52, 52a Inclined sliding surface 60 Hook

Claims (5)

A rotatable spindle around which the webbing is wound;
In a seat belt apparatus comprising an automatic lock mechanism connected to the spindle via a predetermined transmission mechanism and preventing rotation of the spindle when the webbing wound around the spindle is pulled out by a predetermined amount,
A drive gear to which rotation of the spindle is transmitted;
A first gear that is supported so as to be movable relative to the shaft of the drive gear;
A transmission member supported at the end by a housing and movable by the first gear;
A moving means interposed between the drive gear and the first gear to relatively move the shaft of the drive gear and the shaft of the first gear;
Switch means switched by the transmission member;
A hook portion formed on the housing, and a restricting means formed on the transmission member, having a window hole portion with which the hook portion engages, and restricting movement of the transmission member;
With
An inclined sliding surface on which the hook portion slides is formed around a window hole portion of the transmission member.   The seat belt device according to claim 1, wherein the inclined sliding surface has a curved surface shape.   The seat belt device according to claim 1 or 2, wherein the inclined sliding surface is formed on one end side from an intermediate portion of the window hole portion in a movable direction of the transmission member.   The sheet according to any one of claims 1 to 3, wherein the inclined sliding surface has a shape that changes a length in a short side direction of the window hole portion along a swinging direction of the transmission member. Belt device.   The said inclined sliding surface has a shape which changes the thickness of the said transmission member along the rocking | fluctuation direction of the said transmission member on the surface around the said window hole part, The any one of Claims 1-3 characterized by the above-mentioned. A seat belt device according to claim 1.

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