JP2010036680A - Incline mechanism of active headrest - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an incline mechanism of an active headrest with a simple structure and small number of components. <P>SOLUTION: The incline mechanism of the active headrest includes a fixed stay to which a backside of the headrest is attached, a motor that is attached to the fixed stay and can rotate in both directions, a ball-screw mechanism that rotates when the rotation of the motor is transmitted, a mobile body coupled to a nut of the ball-screw mechanism, a rail body inclined obliquely upward toward front from obliquely downward toward rear by guiding the mobile body, and a movable stay to which a front side of the headrest is attached and which is coupled to the mobile body so that it can move in an obliquely fore-and-aft direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a headrest of a vehicle seat, and more particularly to a headrest mechanism in which a headrest is configured by a front side portion and a rear side portion, and the front side portion is movable.

Patent Document 1 discloses an X-link mechanism that tilts the headrest and pushes it upward in the front to reduce the distance between the headrest and the passenger's head when it detects that the following vehicle is approaching and may collide. Has been. Although the X link mechanism can reduce the unused storage state space, it has many parts and is complicated.
WO2005 / 073019

  An object of the present invention is to provide a tilting mechanism of an active headrest having a simple structure and a small number of parts.

  In order to achieve the above object, the tilting mechanism of the active headrest according to the present invention includes a fixed stay to which a rear side portion of the headrest is attached, a motor attached to the fixed stay and capable of normal rotation and reverse rotation, and rotation of the motor. Rotating ball screw, a moving body connected to the nut of the ball screw, a rail body that guides the moving body and that is inclined obliquely from the lower rear to the upper front and the front side of the headrest is attached And a movable stay connected to the moving body and movable obliquely back and forth.

  According to the present invention, since the tilting mechanism for moving the movable stay of the headrest is composed of a motor, a gear, a ball screw, a rail, and a moving body, the number of parts can be reduced. Further, since the ball screw has high feeding accuracy, the headrest can be moved to an accurate position. The ball screw has a built-in steel ball and is light in rotation and does not place a burden on the motor. Since the rail is attached obliquely, the front side portion of the headrest can be tilted obliquely upward to accurately receive the head of the occupant.

  Hereinafter, a tilting mechanism of an active headrest according to the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a tilting mechanism of an active headrest according to the present invention. The tilting mechanism 15 includes a fixed stay 1 connected to the seat back frame, a bracket 2 attached to the fixed stay 1, a motor 3 attached to the bracket 2 capable of normal rotation and reverse rotation, and rotation of the motor 3 with the main driving gear 8. A ball screw 4 received via the gear 9, a rail body 5 attached to the bracket 2, a moving body 6 that is engaged with the rail body 5 and moves back and forth by the rotation of the ball screw 4, and a movable stay 7 that is connected to the moving body 6 Consists of.

  FIG. 2 is a side view showing the inside of FIG. A main driving gear 8 is attached to the shaft of the motor 3. When the main driving gear 8 rotates, the driven gear 9 rotates and the rotation is transmitted to the ball screw 4. In the ball screw 4, a nut 10 is screwed with a steel ball 13. When the ball screw 4 rotates, the nut 10 moves forward or backward according to forward rotation or reverse rotation lightly and smoothly.

  FIG. 3 is a cross-sectional view taken along the line AA of FIG. The moving body 6 is connected to the nut 10 of the ball screw 4 and is engaged with the left and right rail bodies 5. A movable stay 7 is attached to the left and right ends of the moving body 6. When the ball screw 4 rotates, the nut 10 moves, and thereby the moving body 6 moves in the front-rear direction.

  FIG. 4 is a side view for explaining the operation of FIG. The active headrest 20 is configured such that the tilting mechanism 15 is covered with the front side portion 11 and the rear side portion 12. (A) shows the case where the movable stay 7 of the headrest 20 is located rearward. The stretchable part between the front side part 11 and the rear side part 12 is in a contracted state. When the motor 3 is rotated to rotate the ball screw 4, the movable stay 7 of the headrest 20 moves forward as shown in (B). The stretchable part between the front side part 11 and the rear side part 12 is in an extended state. The amount of movement of the movable stay 7 can be accurately determined by how many times the motor 3 is rotated. When the motor 3 is reversed, the movable stay 7 moves backward. The rail body 5 is provided so as to be inclined obliquely from the obliquely rearward downward to the forward obliquely upward. Thus, when the movable stay 7 is moved forward, the upper end becomes higher by the amount indicated by L1. Thereby, the front side part 11 can catch the head of a passenger | crew's head exactly, when it is collided.

  When it is likely to be a rear-end collision according to the present invention, the distance between the passenger's head and the headrest is reduced, which is suitable as an active headrest that can reduce whipping damage caused by the rear-end collision.

It is a perspective view of the tilting mechanism of the active headrest by this invention. (Example 1) It is a side view which shows the inside of FIG. (Example 1) It is AA sectional drawing of FIG. (Example 1) FIG. 2 is a side view illustrating the operation of FIG. 1. (A) shows the case where the movable stay of the active headrest is located rearward, and (B) shows the case where the movable stay of the active headrest moves forward.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixed stay 2 Bracket 3 Motor 4 Ball screw 5 Rail body 6 Moving body 7 Movable stay 8 Main drive gear 9 Driven gear 10 Nut 11 Front side part 12 Rear side part 13 Steel ball 15 Tilt mechanism 20 Active headrest

Claims (1)

A fixed stay to which the rear side of the headrest is attached;
A motor capable of normal rotation and reverse rotation attached to the fixed stay;
A ball screw that rotates by the rotation of the motor being transmitted;
A moving body coupled to the nut of the ball screw;
A rail body that guides the movable body and is inclined obliquely upward and obliquely downward from obliquely downward and downward;
An active headrest tilting mechanism comprising: a movable stay attached to the front side of the headrest and connected to the moving body and movable obliquely back and forth.

Images