JP5355027B2 - Headrest actuating device and mounting method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headrest operating device and its installation method capable of actually realizing an active headrest capable of improving reliability. <P>SOLUTION: A piston side cover member 50 of the headrest operating device 12 is inserted into a cover member insertion hole 54 of a support member 14, and the headrest operating device 12 is rotated with the cylinder axis Y of a cylinder member 18 as the rotational axis in an inserted state, and a first projection part 34 and a second projection part 36 of a bracket 24 are respectively suitable for a first slit 38 and a second slit 40 of the support member 14. When hole positions of a bolt insertion hole 30 arranged in the bracket 24 and a bolt fastening hole 32 arranged in the support member 14 substantially coincide by rotation, a bolt is inserted into the bolt insertion hole 30 of the bracket 24, and is fastened to the bolt fastening hole 32 of the support member 14. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a headrest actuating device for moving a headrest provided on a seat of a vehicle at the time of a vehicle collision, and a mounting method thereof.

  In general, when a vehicle such as an automobile is driven in a normal posture, the head of the occupant and the headrest are separated from each other. At this time, for example, when a rear collision or the like is received, the head of the occupant moves so as to greatly warp backward due to inertial force. In order to suppress such rearward movement, an active headrest system has been proposed in which the headrest is moved forward and the occupant's head is actively supported.

  As one of such active headrest systems, for example, Patent Literature 1 discloses a headrest operating device that moves a headrest by a mechanical drive mechanism. In this conventional headrest actuating device, the headrest that can be moved forward by the link mechanism is normally held at the initial position by the holding mechanism while being biased forward by the spring member. At the time of rear-end collision of the vehicle, the press plate disposed at the lower part in the backrest portion is pushed and moved by the backrest load of the occupant, and in conjunction with this movement, transmission means for connecting the press plate and the holding mechanism ( Wire) is pulled. Thereby, holding | maintenance of the headrest by a holding mechanism is cancelled | released, and a headrest moves to the restraint position which restrains a passenger | crew's head.

Patent Document 2 discloses a headrest operating device that moves a headrest by a drive mechanism using an electric motor. In this conventional headrest actuating device, in the event of a vehicle collision, the link mechanism is driven by a front / rear drive motor provided in the headrest based on a detection signal from a sensor that detects the occurrence (or prediction of the occurrence) of the collision. The headrest is moved in the front-rear direction, and the headrest support rod is moved up and down by the vertical drive motor provided in the backrest, so that the headrest is moved up and down, and the headrest restrains the occupant's head. Move to the position.
JP 2005-104259 A JP 2006-182277 A

  In the headrest actuating device described in Patent Document 1, since it is necessary to provide the press plate at a portion that receives the backrest load of the occupant (that is, the waist portion), the press plate is provided below the backrest portion. The transmission means for connecting the holding mechanism and the holding mechanism is bent. For this reason, the path of the transmission means becomes long, and it may take time until the headrest starts moving after the collision. In this headrest operating device, as described above, the press plate provided in the backrest portion is pushed and moved by the occupant's backrest load, whereby the transmission means is pulled, and as a result, the headrest moves. Therefore, for example, when the occupant's back load acts on the press plate due to acceleration when the vehicle suddenly starts, or when traction force acts on the transmission means for some reason, the vehicle does not collide. The headrest could malfunction.

  On the other hand, in the headrest actuating device described in Patent Document 2, since the electric motor is driven to move the headrest by detecting the occurrence of a collision with a sensor, the possibility of malfunction as described above is low. Since the motor was used, there was a problem that the operation speed of the headrest was slow.

  As described above, in any of the above prior arts, there is a problem in terms of the time required for the headrest to move after the collision, the possibility of malfunction, and the operating speed, and the reliability of the active headrest is sufficient. I could not say.

  Therefore, the cylinder member, the piston member that slides in the cylinder member in the axial direction, and the gas supply means for supplying gas into the cylinder member, the piston member is slid by gas supply, and the holding mechanism is used. A headrest actuating device that releases the holding of the headrest and moves the headrest is conceivable. By doing in this way, time until a headrest starts a movement after a collision can be shortened. Further, since the headrest is moved by detecting the occurrence (or prediction of occurrence) of the collision with the sensor, the occurrence of malfunction can be suppressed as compared with the case where the headrest is mechanically moved by the backrest load of the occupant. . Furthermore, since the headrest is moved by the biasing force of the spring member by releasing the holding by the holding mechanism, the operating speed of the headrest can be increased as compared with the case where the headrest is driven by the electric motor. From the above, the reliability as an active headrest can be improved.

  However, in order to realize such an active headrest that can improve reliability, it is necessary to replace the headrest operating device every time the headrest moves (that is, every time the gas supply means is activated). It is necessary to make the structure in consideration of workability such as easy work.

  An object of the present invention is to provide a headrest actuating device and an attachment method thereof that can practically realize an active headrest that can improve reliability.

In order to achieve the above object, a headrest actuating device according to a first aspect of the present invention is a headrest for moving the headrest by releasing the holding by a holding mechanism of the headrest that is movably provided on the upper part of the seat of the vehicle. a hydraulic device, a cylindrical cylinder member, by sliding the cylinder member formed in a cylindrical inside housing part in a first cylinder axis, through a transmission means, said by the holding mechanism A piston member for releasing the holding of the headrest, and a cylindrical mounting portion formed on the cylinder member and having a second cylindrical shaft bent from the first cylindrical shaft, are slid on the piston member Gas supply means for supplying a gas to the cylinder member based on a detection signal from a sensor for detecting the occurrence or prediction of the occurrence of a vehicle collision By and said cylinder member is provided on a bracket which is formed between the housing part and the mounting portion of the cylinder member) is rotated as the rotation axis the first cylindrical shaft, the headrest actuating device a projection portion fitted into the fitting portion formed in the support member for supporting, characterized in that it has a.

  In general, in an active headrest system that actively supports the occupant's head in order to suppress the rearward movement of the occupant's head in the event of a rear collision of the vehicle, the headrest provided on the upper part of the seat is a link The mechanism is configured to be movable from an initial position to a front restraint position that restrains the head of the occupant. The headrest is normally held stationary at the initial position by the holding mechanism while being biased toward the restrained position by the spring member.

A second cylinder shaft formed on the cylinder member and bent from the first cylinder axis based on a detection signal from a sensor for detecting the occurrence (or prediction of occurrence) of the collision at the time of a rear collision of the vehicle The gas supply means mounted on the cylindrical mounting portion having the function is activated to supply gas into the cylinder member. Thus, when the piston member slides within the housing portion of the cylinder member in a first cylinder axis direction, the holding of the headrest by the holding mechanism through a transmission means is released, the headrest restraining position by the biasing force of the spring member Moving.

  Thus, since it is the structure which makes a piston member slide by gas supply and moves a headrest, the time until a headrest starts a movement after a collision can be shortened. Further, since the headrest is moved by detecting the occurrence (or prediction of occurrence) of the collision with the sensor, the occurrence of malfunction can be suppressed as compared with the case where the headrest is mechanically moved by the backrest load of the occupant. . Furthermore, since the headrest is moved by the biasing force of the spring member by releasing the holding by the holding mechanism, the operating speed of the headrest can be increased as compared with the case where the headrest is driven by the electric motor. From the above, the reliability of the active headrest can be improved.

  Here, in order to realistically realize such an active headrest that can improve the reliability, it is necessary to replace the headrest operating device every time the headrest moves (that is, every time the gas supply unit is activated), It is necessary to make the structure considering workability, such as easy replacement work.

Therefore, in the headrest operating device according to the first aspect of the present invention, the cylinder member is provided on a bracket formed between the storage portion and the mounting portion by rotating the cylinder member around the first cylinder shaft. It is set as the structure which has a projection part fitted to the fitting part formed in the support member for supporting the headrest actuator. Thus, when attaching the headrest operating device in the replacement work, the worker rotates the cylinder member and engages the protrusion with the fitting portion of the supporting member, thereby temporarily mounting the headrest operating device to the supporting member. It can be carried out. Thereafter, the main assembly can be performed by fastening with, for example, a bolt or the like from the temporarily assembled state.

  Thus, according to the first invention of the present application, it is possible to perform temporary assembly during the replacement operation of the headrest operating device, so that the operator himself supports the headrest operating device when performing fastening with a bolt or the like. Even without this, the headrest actuating device can be prevented from falling from the support member. Thereby, replacement work becomes easy and workability can be improved. Therefore, an active headrest that can improve reliability can be realized practically.

According to a second aspect of the present invention, there is provided the headrest actuating device according to the first aspect, further comprising: a lid member provided with a piston insertion hole through which the piston member can be inserted, and covering the opening of the other end portion of the cylinder member. and and said lid member, when inserted into the lid member insertion hole formed in the support member, the axial direction of the first tubular shaft and said transmission means is configured to substantially coincide, The cylinder member is rotated in a state where the lid member is inserted into the lid member insertion hole of the support member.

In the headrest actuating device according to the second invention of the present application, when the headrest actuating device is replaced, the lid member provided at the other end of the cylinder member is inserted into the lid member insertion hole formed in the support member. Then, the cylinder member is rotated and temporarily assembled. At this time, the lid member, when inserted into the lid member insertion hole formed in the support member, the axial direction of the first cylindrical shaft and the transmission means are configured to substantially coincide. Thus, when performing assembling the temporary is adapted to the axial direction of the first cylindrical shaft and the transmission means is substantially coincident, the operator can cause the axial displacement of the piston member and the transmitting means The headrest actuating device can be replaced without any change. As a result, the headrest actuating device can be easily replaced while maintaining the reliability of the function of the transmission means that transmits the sliding movement of the piston member to the holding mechanism and releases the holding of the headrest by the holding mechanism. it can.

According to a third aspect of the present invention, in the second invention, the cylinder member includes the cylinder member provided with a bolt insertion hole for inserting a bolt for fixing the cylinder member to the support member. A bracket for fixing to a backrest portion of a seat; the bolt insertion hole is configured such that the cylinder member is rotated about the first cylindrical shaft as a rotation axis, and the projection portion is fitted to the support member. The fitting hole is formed so that a hole position substantially coincides with a fastening hole formed in the support member and fastened with the bolt when fitted into the joint portion.

In the headrest actuating device of the third invention of the present application, the cylinder member has a bracket for fixing the cylinder member to the backrest portion of the seat, and the bracket is provided with a bolt for fixing the cylinder member to the support member. Bolt insertion holes for insertion are provided. The bolt insertion hole is a fastening hole that is formed in the support member and the bolt is fastened when the cylinder member is rotated about the first cylindrical shaft as the rotation axis and the protrusion is fitted into the fitting portion of the support member. And the hole positions substantially coincide with each other. As a result, the operator simply rotates the cylinder member and temporarily mounts it, and does not adjust the position of the bolt insertion hole of the bracket and the fastening hole of the support member. It can be inserted and fastened in the fastening hole of the support member, and the main assembly with bolts can be easily performed. Therefore, replacement work becomes easier and workability can be further improved.

According to a fourth aspect of the present invention, there is provided the headrest actuating device according to the third aspect, wherein the bracket has two protrusions on both left and right sides in a direction substantially perpendicular to the first cylinder axis direction. The portions are respectively fitted to the two fitting portions formed on the support member by rotating the cylinder member about the first cylindrical shaft as a rotation axis.

In the headrest operating device according to the fourth aspect of the present invention, the bracket of the cylinder member has two protrusions on the left and right sides in the direction substantially orthogonal to the first cylinder axis direction. Thus, the operator can fit the two protrusions to the support member when attaching the headrest operating device in the replacement work, and can stably support the headrest operating device with respect to the support member. Therefore, the stability of temporary assembly can be improved. As a result, replacement work is further facilitated, and workability can be further improved.

In order to achieve the above object, a method for mounting a headrest actuating device according to a fifth aspect of the present invention is a cylindrical cylinder member, and slides in a cylindrical storage portion formed in the cylinder member in the first cylindrical axis direction. A piston member is mounted on a cylindrical mounting portion formed on the cylinder member and having a second cylindrical shaft bent from the first cylindrical shaft, and the piston member is slid into the cylinder member. A gas supply means for supplying a gas for use, and a lid member provided with a piston insertion hole through which the piston member can be inserted, and provided to cover an opening at the other end of the cylinder member, A headrest actuating device for attaching a headrest actuating device for moving a headrest provided on an upper portion of a seat seat to a support member provided on the seat seat, comprising: The lid member, the procedure and the axial direction is inserted so as to be substantially coincident said first cylindrical shaft and the transmission means to the lid member insertion hole formed in the support member, in a state where the insertion of the lid member, wherein The protrusion provided on the bracket formed between the cylindrical housing portion formed on the cylinder member and the mounting portion is fitted into the fitting portion formed on the support member. Thus, in order to insert the bolt which is provided in the bracket which the cylinder member has, and fixes the cylinder member to the support member by the procedure which rotates the 1st cylinder axis as a rotation axis, and the rotation of the cylinder member A step of fitting the projecting portion into the fitting portion so that the hole positions of the bolt insertion hole and the fastening hole formed in the support member to which the bolt is fastened substantially coincide with each other; and Bolt insertion Inserted into the hole, and having a procedure for fastening the fastening hole of the support member substantially coincides hole position.

In the fifth invention of the present application, the lid member is inserted into the lid member insertion hole formed in the support member so that the first cylindrical shaft and the axial direction of the transmission means substantially coincide with each other. The member is fitted to the fitting portion formed on the support member so that the protrusion provided on the bracket formed between the cylindrical storage portion formed on the cylinder member and the mounting portion is fitted. rotating the first cylindrical shaft as a rotational axis, this rotation is formed in the bolt insertion hole and the support member for being provided in the bracket with the cylinder member through which the bolts for fixing the cylinder member to the support member as the hole position of the fastening hole a bolt is fastened substantially coincides, in after fitting the protrusion into the fitting portion, by inserting the bolt into bolt insertion holes, substantially matching the support member of hole positions By tightening in the fastening hole, the head Attaching a strike actuator to the support member.

  Thus, when attaching the headrest actuating device, the operator rotates the cylinder member and fits the protrusion to the fitting portion of the support member, thereby performing temporary assembly to the support member of the headrest actuating device. be able to. Thereby, when fastening with a volt | bolt, even if an operator does not support a headrest operating device itself, it can prevent that a headrest operating device falls from a supporting member. As a result, replacement work becomes easy and workability can be improved. Therefore, an active headrest that can improve reliability can be realized practically.

  In the fifth invention of the present application, the cylinder member is rotated in a state where the lid member provided at the other end of the cylinder member is inserted into the lid member insertion hole formed in the support member. At this time, when the lid member is inserted into the lid member insertion hole formed in the support member, the piston member and the transmission for transmitting the sliding movement of the piston member to the holding mechanism and releasing the holding of the headrest by the holding mechanism. If it is configured such that the axial direction of the means substantially coincides, it is possible to make the axial directions of the piston member and the transmission means substantially coincide when temporarily assembled. Thereby, the operator can replace the headrest actuating device without causing the axial displacement between the piston member and the transmission means. As a result, the headrest actuating device can be easily replaced while maintaining the reliability of the function of the transmission means that transmits the sliding movement of the piston member to the holding mechanism and releases the holding of the headrest by the holding mechanism. it can.

Further, in the fifth invention of the present application, the hole position of the bolt insertion hole provided in the bracket of the cylinder member is such that the cylinder member is rotated about the first cylindrical shaft as the rotation axis, and the protrusion is the fitting portion of the support member When fitted, it substantially coincides with the position of the fastening hole formed on the support member and fastened with the bolt. As a result, the operator simply rotates the cylinder member and temporarily assembles it, inserts the bolt into the bolt insertion hole whose hole position is substantially the same, and fastens it to the fastening hole of the support member. It can be done easily. Therefore, replacement work becomes easier and workability can be further improved.

  ADVANTAGE OF THE INVENTION According to this invention, the active headrest which can improve reliability can be implement | achieved realistically.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an external appearance of an upper part of a seat of an automobile provided with an embodiment of a headrest actuating device of the present invention. FIG. 1 (a) is a normal state and FIG. Shows the time.

  In FIG. 1, a seat 2 of an automobile (or a vehicle other than an automobile) on which an occupant is seated includes a seating portion (not shown) that supports the occupant from below, and a backrest portion 4 that supports the occupant's back. The headrest 8 is supported by two support rods 6 and 6 at the upper portion of the backrest portion 4. The headrest 8 is an active headrest that actively supports the occupant's head in order to restrict the occupant's head from moving rearward at the time of a rear collision of the automobile (hereinafter referred to as “rear collision”), etc. The link mechanism 10 is configured to be movable from an initial position (position shown in FIG. 1 (a)) to a front restraint position (position shown in FIG. 1 (b)) that restrains the head of the occupant.

  As shown in FIG. 1A, the headrest 8 is normally in a stationary state at an initial position by a holding mechanism (not shown) while being biased in a restrained position direction by a spring member (not shown). Is held in. On the other hand, as shown in FIG. 1B, the inner rod 26 provided in the support rod 6 (transmission means; see FIGS. 4 and 5 to be described later) is pushed up at the time of rear collision of the automobile. The holding of the headrest 8 by the holding mechanism is released, and the headrest 8 is moved to the restrained position by the biasing force of the spring member.

  The link mechanism 10 is fixed to the back side of the headrest 8 and is provided between the headrest side support member 66 that moves together with the headrest 8 and the support rods 6, 6. The link mechanism 10 has the spring member and the holding mechanism therein, and the support rod 6 and a headrest support base 68 fixed to the head 6. The headrest side support member 66 is provided with a connecting rod 70 so as to penetrate left and right. The headrest support base 68 is formed with a slit 72 in which the connecting rod 70 can slide (see FIG. 1B). Thereby, the headrest side support member 66 is movable with respect to the headrest support base 68 within a range in which the connecting rod 70 can slide in the slit 72.

  Next, an operation for releasing the holding of the headrest 8 by the holding mechanism will be described. At the time of rear-end collision of the automobile, the inner rod 26 is pushed up to rotate the rotating member (not shown), and the rotating shaft (not shown) is rotated accordingly. As a result, the cam member (not shown) provided on the rotating shaft rotates, and as a result, the locking of the connecting rod 70 held by the locking member (not shown) is released, and the spring The connecting rod 70 is pulled up by the biasing force of the member. Thereby, the connecting rod 70 slides to the upper end of the slit 72, and as a result, the headrest side support member 66 and the headrest 8 provided with the connecting rod 70 move to the restraining position shown in FIG. The locking member corresponds to a holding mechanism.

  FIG. 2A is a cross-sectional view showing an internal structure viewed from the front of the backrest portion 4, and FIG. 2B is a partially enlarged view showing an X portion in FIG. 2A.

  As shown to Fig.2 (a), the headrest actuator 12 and the supporting member 14 which supports this are provided in the upper part in the backrest part 4 of the seat 2. The support member 14 is provided so as to connect the lower ends of the support rods 6 and 6 that support the headrest 8, and when the height of the headrest 8 is adjusted by the adjuster 16 provided in the seat frame 15 of the seat seat 2. In addition, the headrest actuating device 12 and the support member 14 are moved up and down together with the headrest 8 and the support rods 6 and 6.

  The headrest actuating device 12 is for moving the headrest 8 (that is, moving the headrest 8 from the initial position to the restraint position) by releasing the holding of the headrest 8 by the holding mechanism at the time of a rear collision of the automobile. As shown in FIG. 2 (b), the headrest operating device 12 is provided at a cylindrical cylinder member 18 and at one end portion (lower end portion in FIG. 2) of the cylinder member 18. An inflator 22 (gas supply means) that supplies gas for sliding (see FIG. 3 described later) into the cylinder member 18 is included (FIG. 2B shows only the initiator 22a of the inflator 22). ), The cylinder member 18 is fixed to the back side (the back side in FIG. 2) of the support member 14 with a bolt (not shown) through the bracket 24 together with the piston member 20 and the inflator 22, thereby enabling the headrest actuating device. 12 is fixed to the back side of the support member 14. At this time, the headrest operating device 12 is connected to the support rod 6 on one side (right side in FIG. 2).

  Various sensors (not shown) for detecting the occurrence (or prediction of occurrence) of the automobile on which the headrest actuating device 12 of the present embodiment is mounted when the automobile collides (including rear collision). Is provided. In an emergency such as a rear collision, these sensors detect this, and an inflator control circuit (not shown) outputs an activation signal via the cable 25 based on the detection signals from these sensors. Initiator 22a (see FIG. 3 described later) is activated. As a result, the inflator 22 is activated, and the gas for sliding the piston member 20 is ejected into the cylinder member 18.

  FIG. 3 is an exploded perspective view showing the detailed structure of the headrest actuator 12.

  In FIG. 3, the headrest actuating device 12 includes a cylindrical cylinder member 18 and the inner rod 26 provided in the support rod 6 by sliding the cylinder member 18 in the cylinder axis Y direction. The piston member 20 that releases the holding of the headrest 8 by the holding mechanism and the gas that is provided at one end (the lower end in FIG. 3) of the cylinder member 18 to slide the piston member 20 And an inflator 22 that is supplied into the cylinder member 18 based on a detection signal from a sensor that detects occurrence or prediction of occurrence of a collision.

  The cylinder member 18 has a piston member storage portion 18a for storing the piston member 20 therein, and an inflator mounting portion 18b to which the inflator 22 is fixed, and the cylinder axis Y direction on the piston member storage portion 18a side, The inflator mounting portion 18b side is bent in the direction of the cylinder axis Z. Thus, as shown in FIG. 2 described above, when the headrest actuating device 12 is mounted on the support member 14, the inflator mounting portion 18b side of the cylinder member 18 is bent toward the front side of the seat. As a result, when the headrest operating device 12 is disposed in the backrest portion 4, the lower portion of the headrest operating device 12 can be prevented from contacting the back plate 28 (see FIG. 2) of the backrest portion 4.

  The cylinder member 18 has a bracket 24 for fixing the cylinder member 18 to the support member 14 on the piston member housing portion 18a side. The bracket 24 and the cylinder member 18 are cast (for example, aluminum die casting). It is constructed integrally. The bracket 24 is provided with a bolt insertion hole 30 for inserting a bolt (not shown) for fixing the cylinder member 18 to the support member 14. The bolt insertion hole 30 is formed on the support member 14 when the headrest actuating device 12 is attached to the support member 14, and the cylinder member 18 is rotated about the cylinder axis Y as a rotation axis. The fastening hole 32 (see FIG. 6B and FIG. 7 described later) is formed so that the hole position substantially coincides (details will be described later).

  The bracket 24 has a first protrusion 34 and a second protrusion 36 on both ends in the longitudinal direction (on the left and right sides in a direction substantially orthogonal to the cylinder axis Y direction of the cylinder member 18). The first protrusion 34 and the second protrusion 36 are formed on the support member 14 when the cylinder member 18 is rotated about the cylinder axis Y when the headrest actuating device 12 is attached to the support member 14. The first slit 38 (fitting portion, see FIG. 6 described later) and the second slit 40 (fitting portion, see FIG. 6 described later) are respectively fitted (details will be described later).

  The piston member 20 has an enlarged diameter portion 41 at the lower end portion, and a groove portion 42 is formed in the enlarged diameter portion 41. The piston member 20 is housed in the piston member housing portion 18a of the cylinder member 18 with the O-ring 44 mounted in the groove portion 42. A groove 46 is formed in the upper part of the piston member 20. When the gas is not supplied by the inflator 22, the groove 46 is engaged with a claw portion 48a of a locking member 48 (positioning member) provided in the opening 47 on the piston member storage portion 18a side of the cylinder member 18, and the piston member. The cylinder axis Y direction position with respect to 20 cylinder members 18 is fixed (see FIG. 4 described later). On the other hand, when the gas is supplied by the inflator 22, the claw portion 48a of the locking member 48 made of, for example, resin is expanded by the pressing force of the piston member 20 by gas, and the locking by the claw portion 48a is released, and the piston member 20 is released. Is allowed to slide in the direction of the cylinder axis Y (see FIG. 5 described later).

  An external thread is formed on the outer peripheral surface of the piston member storage portion 18a of the cylinder member 18, the piston member 20 is stored in the piston member storage portion 18a, and the locking member 48 is provided in the opening 47. The piston-side lid member 50 having an inner thread formed on the inner peripheral surface is fixed to the piston member housing portion 18a by screwing so as to cover the opening 47. The piston-side lid member 50 (lid member) includes a piston insertion hole 52 through which the piston member 20 can be inserted, and the piston-side lid member 50 is a lid member insertion hole 54 (described later) formed in the support member 14. 6 (b)), the axial directions of the piston member 20 and the inner rod 26 substantially coincide with each other.

  An outer thread is formed on the outer peripheral surface of the end portion of the cylinder member 18 on the inflator mounting portion 18b side, and an inner screw is formed on the inner peripheral surface in a state where the inflator 22 is mounted in the opening 56 on the inflator mounting portion 18b side. The inflator side lid member 58 is fixed to the inflator mounting portion 18b by screwing so as to cover the opening 56. The inflator-side lid member 58 includes an inflator insertion hole 60 for inserting the initiator 22a of the inflator 22, and the initiator 22a inserted through the inflator insertion hole 60 is connected to the inflator control circuit via the cable 25. (Not shown).

  4 and 5 are views for explaining the operation of the piston member 20 of the headrest actuating device 12. FIG. 4 (a) is a front view of the headrest actuating device 12 in a normal state, and FIG. 4 (b) is a diagram. 4 (a) is a cross-sectional view taken along the line AA in FIG. 5, FIG. 5 (a) is a front view of the headrest actuating device 12 when the headrest is moved, and FIG. 5 (b) is a cross-sectional view taken along the line BB in FIG. It is.

  As described above, the headrest actuating device 12 has one side (the right side in FIG. 2) when the piston side lid member 50 is inserted into the lid member insertion hole 54 formed in the support member 14 and attached to the support member 14. The support rod 6 is connected. At this time, as shown in FIGS. 4 and 5, the axial directions of the piston member 20 and the inner rod 26 provided in the support rod 6 are substantially the same.

  During normal times, no gas is supplied by the inflator 22, so that the locking member 48 locks the claw portion 48 a to the groove portion 46 of the piston member 20 as shown in FIGS. 4A and 4B. Thus, the cylinder axial position of the piston member 20 with respect to the cylinder member 18 is fixed. At this time, the inflator 22 side end portion (lower end portion in FIG. 4) of the piston member 20 is in contact with a stepped portion 62 formed inside the piston member storage portion 18 a of the cylinder member 18. In this state, a predetermined clearance (for example, about 3.5 mm) is provided between the piston member 20 and the inner rod 26, and the headrest 8 is held stationary at the initial position by the holding mechanism.

  On the other hand, since gas is supplied by the inflator 22 at the time of a rear collision of the automobile, as shown in FIGS. 5 (a) and 5 (b), the pawl portion 48a of the locking member 48 is a piston member made of gas. The piston member 20 is extended by the pressing force of 20 and the locking by the claw portion 48a is released, and the sliding of the piston member 20 in the cylinder axis direction (upward in FIG. 5) is allowed. As a result, the piston member 20 slides upward until the enlarged diameter portion 41 abuts against the locking member 48 to push up the inner rod 26, whereby the holding of the headrest 8 by the holding mechanism is released, and the headrest 8 Is moved to the restraint position by the biasing force of the spring member.

  6A and 6B are diagrams illustrating a state before the headrest actuating device 12 is attached to the support member 14. FIG. 6A is a rear view of the headrest actuating device 12 as viewed from the back, and FIG. It is the perspective view which extracted and extracted the attachment part of the headrest actuator 12 of this.

  6A and 6B, the support member 14 is provided with a lid member insertion hole 54 into which the piston side lid member 50 is inserted. As described above, when the piston-side lid member 50 is inserted into the lid member insertion hole 54 of the support member 14, the axial directions of the piston member 20 and the inner rod 26 substantially coincide.

  Further, the support member 14 is provided with a first slit 38 and a second slit 40 into which a first protrusion 34 and a second protrusion 36 provided on both ends in the longitudinal direction of the bracket 24 are respectively fitted. The first slit 38 and the second slit 40 are formed at positions corresponding to the first protrusion 34 and the second protrusion 36 of the headrest operating device 12, respectively, and when the headrest operating device 12 is attached to the support member 14. In addition, by rotating the cylinder member 18 about the cylinder axis Y as a rotation axis, the first protrusion 34 and the second protrusion 36 of the bracket 24 are moved into the first slit 38 and the second slit 40, respectively, with the rotation. It enters and is fitted into the first slit 38 and the second slit 40, respectively.

  The first slit 38 and the second slit 40 are in contact with the first protrusion 34 and the second protrusion 36 to stop the rotation of the cylinder member 18 (see FIG. 7C described later). ) And a bolt insertion hole 30 provided in the bracket 24 when the first protrusion 34 and the second protrusion 36 come into contact with the end 38a and the end 40a, and a support member. The hole position with the bolt fastening hole 32 provided in 14 is substantially the same.

  FIG. 7 is a view for explaining a method of attaching the headrest actuating device 12 to the support member 14.

  When attaching the headrest actuating device 12 to the support member 14, the operator first tilts the headrest actuating device 12 with respect to the support member 14 (the first protrusion of the bracket 24) as shown in FIG. The lid member 50 is formed on the support member 14 with the piston side lid member 50 in a state in which the portion 34 and the second protrusion 36 are inclined so as not to enter the first slit 38 and the second slit 40 of the support member 14. Insert into hole 54.

  Next, with the piston side lid member 50 inserted into the lid member insertion hole 54, as shown in FIG. 7B, the headrest actuator 12 (cylinder member 18) is moved to the cylinder member 18 in the direction of arrow C in the figure. The cylinder axis Y is rotated as a rotation axis. At this time, the first protrusion 34 and the second protrusion 36 of the bracket 24 enter the first slit 38 and the second slit 40, respectively, with the rotation, and fit into the first slit 38 and the second slit 40, respectively. Is done.

  Then, as shown in FIG. 7C, the headrest operating device 12 (cylinder member 18) is replaced with the first protrusion 34 and the second protrusion 36 of the bracket 24, the end 38a of the first slit 38 and the second protrusion 38. By rotating the slits 40 until they abut each of the end portions 40a, the bolt insertion holes 30 provided in the bracket 24 and the bolt fastening holes 32 provided in the support member 14 are substantially aligned with each other.

  Thereafter, a bolt (not shown) is inserted into the bolt insertion hole 30 of the bracket 24 and fastened to the bolt fastening hole 32 of the support member 14 whose hole positions are substantially coincident. Thereby, the headrest actuator 12 is attached to the support member 14.

  According to the headrest actuator 12 of the present embodiment described above, the following effects can be obtained.

  That is, in the headrest actuating device 12 of the present embodiment, the inflator 22 is activated and cylinders are activated based on a detection signal from a sensor that detects the occurrence (or prediction of occurrence) of the collision at the time of a rear collision of the automobile. Gas is supplied into the member 18. As a result, when the piston member 20 slides in the cylinder axis Y direction within the cylinder member 18, the holding of the headrest 8 by the holding mechanism is released via the inner rod 26, and the headrest 8 is brought into the restrained position by the biasing force of the spring member. Moving.

  Thus, since it is the structure which makes the piston member 20 slide by gas supply and moves the headrest 8, the time until the headrest 8 starts a movement after a collision can be shortened. Further, since the headrest 8 is moved by detecting the occurrence (or prediction of occurrence) of the collision with the sensor, the occurrence of malfunction is suppressed compared to the case where the headrest 8 is mechanically moved by the backrest load of the occupant. Can do. Furthermore, since the headrest 8 is moved by the biasing force of the spring member by releasing the holding by the holding mechanism, the operating speed of the headrest 8 can be increased as compared with the case where it is driven by the electric motor. From the above, the reliability of the active headrest can be improved.

  In the present embodiment, in particular, the headrest actuating device 12 is provided in the upper part of the backrest 4. That is, in the case of the headrest actuating device 12 of the present embodiment that moves the headrest 8 by sliding the piston member 20 by supplying gas, the headrest operation is performed as in the case where the headrest 8 is mechanically moved by the backrest load of the occupant. It is not necessary to provide a press plate as a device below the backrest 4. Therefore, by providing the headrest actuating device 12 at the upper portion in the backrest portion 4 as in the present embodiment, the inner rod 26 that transmits the operation of the piston member 20 to the holding mechanism can be configured to be short, and the headrest 8 after the collision The time required to start moving can be further shortened.

  In the present embodiment, particularly, when the gas is not supplied by the inflator 22, the locking member 48 locks the claw portion 48 a with the groove portion 46 of the piston member 20, and the position of the piston member 20 in the cylinder axis Y direction with respect to the cylinder member 18. To fix. As a result, even when some external force is applied to the piston member 20 during normal operation, the headrest 8 can be prevented from malfunctioning due to the piston member 20 sliding in the cylinder member 18. On the other hand, when the gas is supplied by the inflator 22, the locking member 48 releases the locking by the claw portion 48a by the pressing force of the gas, and allows the piston member 20 to slide in the cylinder axis Y direction. Thereby, the headrest 8 can be smoothly moved at the time of a rear-end collision of the automobile while preventing the headrest 8 from malfunctioning in normal times.

  In the present embodiment, particularly, when the gas is not supplied by the inflator 22, the stepped portion 62 inside the cylinder member 18 abuts against the end portion of the piston member 20 on the inflator side. Thereby, even when some external force acts on the piston member 20 in normal times, the piston member 20 can be prevented from sliding toward the inflator 22 in the cylinder member 18. On the other hand, when the gas is supplied by the inflator 22, the stepped portion 62 does not prevent the piston member 20 from sliding to the side opposite to the inflator side (that is, the direction in which the inner rod 26 is pushed up). At times, the headrest 8 can be moved smoothly.

  In the present embodiment, in particular, the cylinder member 18 and the bracket 24 are integrally formed by casting. Thereby, compared with the case where the bracket 24 is fixed by welding to the cylinder member 18, for example, the number of parts can be reduced, and the welding process at the time of manufacture can be omitted. In addition, there is an effect that the weight and size of the cylinder member 18 can be reduced as compared with the case of fixing by welding.

  In the present embodiment, the cylinder member 18 is particularly configured such that the direction of the cylinder axis Y on the piston member storage portion 18a side and the direction of the cylinder axis Z on the inflator mounting portion 18b side are bent. As a result, when the cylinder member 18 is configured straight as in this embodiment, the cylinder member 18 is bent even when the lower portion of the headrest operating device 12 contacts the back plate 28 of the backrest portion 4 and cannot be installed. By setting it as a structure, it can be installed in the backrest 4. In this way, even when the installation space in the backrest 4 is insufficient or when it comes into contact with another nearby structure, the backrest can be bent by bending the cylinder member 18 in an appropriate direction. 4 can be installed. Therefore, the freedom degree of installation of the headrest actuator 12 in the backrest part 4 can be improved.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and technical idea of the present invention.

  For example, in the above embodiment, the inner rod 26 is used as the transmission means for transmitting the sliding motion of the piston member 20 to the holding mechanism and releasing the holding of the headrest 8 by the holding mechanism. Other members such as may be used.

  In the above embodiment, the headrest actuating device 12 is provided along the vertical vertical direction, and the piston member 20 slides upward to push up the inner rod 26. However, the present invention is not limited to this. For example, the headrest actuating device 12 is provided along a direction (for example, horizontal direction) inclined with respect to the vertical vertical direction, and the piston member 20 slides in the inclined direction (for example, horizontal direction) to push the inner rod 26. (Or pull) may be configured.

It is a perspective view showing the external appearance at the time of normal time and a headrest operation | movement of the upper part of the seat seat of the motor vehicle provided with one Embodiment of the headrest operation | movement apparatus of this invention. It is sectional drawing showing the internal structure seen from the front of the backrest part, and the elements on larger scale which expand and represent X part. It is a disassembled perspective view showing the detailed structure of a headrest actuator. It is the front view of the headrest actuator in normal times, and sectional drawing by AA section. It is the front view of the headrest operating device at the time of a headrest operation | movement, and sectional drawing by a BB cross section. It is the rear view which looked at the headrest actuator in the state before attaching a headrest actuator to a support member, and the perspective view which extracted and expanded the attachment part of the headrest actuator of a support member. It is a figure for demonstrating the attachment method to the support member of a headrest actuator.

Explanation of symbols

2 Seat Seat 4 Backrest 8 Headrest 12 Headrest Actuating Device 14 Support Member 18 Cylinder Member 20 Piston Member 22 Inflator (Gas Supply Unit)
24 Bracket 26 Inner rod (Transmission means)
30 Bolt insertion hole 32 Bolt fastening hole (fastening hole)
34 First protrusion (protrusion)
36 Second projection (projection)
38 1st slit (fitting part)
40 Second slit (fitting part)
46 Groove 47 Opening 48 Locking member (positioning member)
48a Claw 50 Piston side lid member (lid member)
52 Piston insertion hole 54 Lid member insertion hole 62 Stepped portion (positioning member)
Y cylinder axis Z cylinder axis

Claims (5)

A headrest actuating device for moving the headrest by releasing the holding by the holding mechanism of the headrest provided movably on the upper part of the seat of the vehicle,
A cylindrical cylinder member;
A piston member that releases the holding of the headrest by the holding mechanism through a transmission means by sliding in a cylindrical storage portion formed in the cylinder member in the first cylinder axis direction;
A gas which is mounted on a cylindrical mounting portion formed on the cylinder member and has a second cylindrical shaft bent from the first cylindrical shaft to slide the piston member is used for collision of the vehicle. Gas supply means for supplying the cylinder member based on a detection signal from a sensor for detecting occurrence or prediction of occurrence,
The headrest actuating device is supported by being provided on a bracket formed between the storage portion and the mounting portion of the cylinder member and rotating the cylinder member about the first cylinder shaft. And a protrusion that fits into a fitting portion formed on the support member. The headrest actuating device according to claim 1,
A piston insertion hole through which the piston member can be inserted, and a lid member provided to cover the opening of the other end of the cylinder member;
The lid member is configured such that when inserted into a lid member insertion hole formed in the support member, the first cylindrical shaft and the axial direction of the transmission means substantially coincide with each other,
The headrest operating device according to claim 1, wherein the cylinder member is rotated in a state where the lid member is inserted into the lid member insertion hole of the support member. The headrest actuating device according to claim 2,
The cylinder member has a bracket for fixing the cylinder member to a backrest portion of the seat, provided with a bolt insertion hole for inserting a bolt for fixing the cylinder member to the support member. And
The bolt insertion hole is formed in the support member when the cylinder member is rotated about the first cylindrical shaft and the protrusion is fitted into the fitting portion of the support member. A headrest actuating device, characterized in that it is formed so that the fastening hole to which the screw is fastened and the hole position substantially coincide. In the headrest actuator according to claim 3,
The bracket has two protrusions on the left and right sides in a direction substantially orthogonal to the first cylinder axis direction,
The two protrusions are respectively fitted into the two fitting portions formed on the support member when the cylinder member is rotated about the first cylindrical shaft as a rotation axis. Headrest actuator. A cylindrical cylinder member, a piston member that slides in a cylindrical storage portion formed in the cylinder member in the first cylinder axis direction, and a bending formed on the cylinder member and the first cylinder axis A gas supply means for supplying a gas for sliding the piston member into the cylinder member, and a piston for which the piston member can be inserted; A headrest actuating device for moving a headrest provided on an upper part of a seat of a vehicle, comprising a lid member provided with an insertion hole and covering an opening of the other end portion of the cylinder member; A method of attaching a headrest actuating device for attaching to a support member provided on the seat seat,
Inserting the lid member into a lid member insertion hole formed in the support member so that the first cylindrical shaft and the axial direction of the transmission means substantially coincide;
With the lid member inserted, the cylinder member is formed on the support member with a protrusion provided on a bracket formed between a cylindrical storage portion formed on the cylinder member and the mounting portion. A procedure for rotating the first cylinder shaft as a rotation axis so as to be fitted to the fitted portion;
Due to the rotation of the cylinder member, a bolt insertion hole for inserting a bolt provided on a bracket of the cylinder member for fixing the cylinder member to the support member is formed in the support member and the bolt is fastened. A step of fitting the protruding portion to the fitting portion so that the hole position with the fastening hole is substantially the same;
A method of attaching the headrest actuating device, comprising: inserting the bolt into the bolt insertion hole, and fastening the bolt into the fastening hole of the support member whose hole positions substantially coincide with each other.

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