JPH09240427A - Seat belt device with pretensioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of component items by generating gas so as to press-driving a rack during the clashing of a vehicle and making a manifold for housing a gas generator for rotating the take-up shaft of a retractor in a taking-up direction by a pinion gear integral with a cylinder for housing the upper side of the rack. SOLUTION: During the clashing of a vehicle, high-pressure gas is generated from a gas generator 11 and a manifold case 12 and a cylinder 13 are filled with this gas. A rack 18 is lowered by this high-pressure gas via a piston 16, a gear 24 and a carrier member 28 are rotated, a planetary gear 25 supported by the carrier member 28 is rotated around a solar gear and then the rotating speed of the solar gear is increased. Thus, the take-up shaft is rotated, a seat belt is taken up and thereby slackening is absorbed. Since the manifold case 12 for housing the gas generator 11 is made internal with the cylinder 13 for housing the upper side of the rack 18, the number of component items is reduced, the number of assembling steps is reduced and costs are reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat belt device with a pretensioner capable of removing slack of a belt when a vehicle collides.

[0002]

2. Description of the Related Art Conventionally, in a seat belt device for safely holding the body of an occupant of a vehicle in a seat, a retractor reduces a force for winding a seat belt in order to reduce a feeling of wearing the seat belt. Tends to set. As a result, the slack of the seat belt worn on the body of the occupant increases, and the occupant may not be effectively restrained due to the slack of the seat belt in an emergency such as a vehicle collision. Therefore, in an emergency, a seat belt device with a pretensioner is used in which a retractor is incorporated with a pretensioner for instantly rotating the retractor winding shaft in order to remove the slack of the seatbelt in an emergency.

An example of such a seat belt device with a pretensioner is disclosed in Japanese Patent Application Laid-Open No. 5-162614. In this device 100, as shown in FIG. 3, gas is generated from a gas generator 101 in an emergency, and the piston 103 moves upward in the drawing in the cylinder 102 by this gas pressure. A wire 104, one end of which is fixed to the piston 103, is pulled out, and a seat belt winding shaft is rotated through a coupling device (not shown) around which the wire 104 is wound, so that the seat belt is wound and slack is absorbed. ing.

[0004]

However, the conventional seatbelt device 100 with a pretensioner has the gas generator 10 as a conventional structure.
Manifold case 105 for housing 1 and piston 1
Since the cylinder 102 that movably accommodates 03 is a separate body, there is a problem that the number of parts increases and the number of assembling steps increases, resulting in an increase in cost. Also,
There is a risk that gas pressure may leak from the joint between the manifold case 105 and the cylinder 102 during operation of the gas generator.

Therefore, an object of the present invention is to solve the above-mentioned problems, and the number of parts can be reduced to reduce the number of assembling steps, and the seat with a pretensioner in which the gas pressure generated by the gas generator does not leak. To provide a belt device.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to rotate a pinion gear by pressing and driving a rack with gas pressure generated from a gas generator at the time of a vehicle collision, and to use the pinion gear to rotate a retractor winding shaft into a seat belt. In a seat belt device provided with a pretensioner that rotates in a direction in which the slack is removed, a manifold case that houses the gas generator and a cylinder that houses the upper side of the rack are integrated. This can be achieved by a seat belt device with a pretensioner.

In this seat belt device with a pretensioner, since the manifold case and the casing are integrated, the number of parts can be reduced, whereby the number of assembling steps and the cost can be reduced. Further, since the manifold case and the casing are integrated, the gas pressure generated by the gas generator does not leak between these members.

Further, the object of the present invention is to provide a pretensioner characterized in that a flange portion for attachment is provided at a tip of the cylinder, and a concave groove for fitting the flange portion is provided in a storage case of the pinion gear. It can also be achieved by a seat belt device. This seatbelt device with a pretensioner can be mounted by simply fitting the flange portion at the tip of the cylinder into the concave groove of the accommodating case of the pinion gear, which facilitates assembly.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a seat belt device with a pretensioner according to the present invention will be described below with reference to the drawings. 1 is an exploded perspective view showing a main part of a seat belt device with a pretensioner according to the present invention, and FIG.
FIG.

As shown in FIG. 1, in the seatbelt device 1 with a print tensioner, a cylinder 13 is integrally formed on the lower side of a manifold case 12 accommodating a gas generator 11 by die casting of aluminum and zinc, for example. There is. A flange 15 for mounting is provided at the tip of the cylinder 13.

A piston 16 is slidably inserted into the cylinder 13, and an O-ring 17 is provided below the piston 16.
Are slidably inserted. Further, below the O-ring 17, the upper side of the rack 18 is slidably inserted. A disk portion 19 is provided at the upper end of the rack 18. The rack 18 is provided with teeth 20 from the lower side for a predetermined length.

The rack 18 is inserted into the guide portions 22 which are open on both sides of the rack gear case 21 with appropriate gaps, and meshes with the gear 24. A gear insertion portion 23 is provided on the side of the guide portion 22, and a gear 24 is inserted in the gear insertion portion 23. The gear 24 is a carrier 28.
It is fixed to the member so that it cannot rotate relative to it. The carrier member 28 has three planetary gears 25 rotatably supported by pins 28a. Further, the planetary gear 25 revolves around a sun gear that engages with a winding shaft of a retractor (not shown).

As shown in FIGS. 1 and 2, a concave groove 26 is provided on the upper side of the guide portion 22, and the flange portion 15 of the cylinder 13 is fitted into the concave groove 26. The collar portion 15 can be fitted by simply pushing it from the side of the groove 26.
Reference numeral 27 in FIG. 1 denotes a cover of the crack gear case 21, and after the flange portion 15 is fitted into the groove 26 from the side, the flange portion 15 is clamped and fixed by being screwed to the rack gear case 21. It is a thing. Since the other parts are the same as the conventional ones, detailed description will be omitted.

This seat belt device 1 with a pretensioner
Generates high-pressure gas from the gas generator 11 at the time of a vehicle collision, and the manifold case 12 and the cylinder 13 are filled with the high-pressure gas. The high-pressure gas causes the piston 16, the O-ring 17, and the disk portion 1 of the rack 18 to move.
9 is pressed and the rack 18 descends. by this,
The gear 24 meshed with the rack 18 and the carrier member 28 rotate, and the planetary gear 25 supported by the carrier member 28 revolves around a sun gear (not shown) to accelerate the sun gear. Due to the increased speed rotation of the sun gear, the winding shaft rotates, the seat belt is wound, and the slack is absorbed.

This seat belt device 1 with a pretensioner
Is a manifold case 12 that houses the gas generator 11.
Since the cylinder 13 for housing the upper side of the rack 18 is integrally molded, the number of parts can be reduced, which can reduce the number of assembling steps and reduce the cost. Furthermore, since the collar portion 15 of the cylinder 13 can be fitted into the groove 26 only by linearly pushing it, the assembly becomes easier.

[0016]

As described above, according to the seatbelt device with a pretensioner of the first invention, the manifold case for accommodating the gas generator and the cylinder for accommodating the upper side of the rack are integrated. The number of parts can be reduced,
As a result, the number of assembling steps can be reduced and the cost can be reduced. Further, since the manifold case and the cylinder are integrated, the gas pressure generated by the gas generator does not leak between these members. According to the seat belt device with a pretensioner of the second aspect of the invention, since the mounting flange portion is provided at the tip of the cylinder and the recessed groove for fitting the flange portion into the storage case of the pinion gear is provided, it is only necessary to push the cylinder linearly. It can be fitted with and can be assembled easily.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a main part of a seat belt device with a pretensioner according to the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is an exploded perspective view showing a main part of a conventional seat belt device with a pretensioner.

[Explanation of symbols]

 1 Seatbelt device with pretensioner 11 Gas generator 12 Manifold case 13 Cylinder 15 Collar part 18 Rack 21 Rack gear case 24 Gear 25 Pinion

Claims (2)

[Claims] 1. A pre-press for driving a rack to press and drive a rack by gas pressure generated from a gas generator at the time of a vehicle collision, and rotating a winding shaft of a retractor by the pinion gear in a direction in which slack of a seat belt is removed. A seatbelt device with a tensioner, wherein a manifold case that accommodates the gas generator and a cylinder that accommodates an upper side of the rack are integrated into a seatbelt device with a pretensioner. 2. A seat with a pretensioner according to claim 1, wherein a flange portion for attachment is provided at a tip end of the cylinder, and a concave groove for fitting the flange portion is provided in a storage case of the pinion gear. Belt device.