JP2001301568A - Seat belt winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise transmitted from motor wiring to gas generator wiring as much as possible. SOLUTION: The gas generator wiring 3 is arranged into a gas generator 2 in a seat belt winding device and the motor wiring 5 is arranged into a motor 4 for winding from a controller 1, and they pass through the same wiring path 6. Among them, ordinary parallel wiring is used in the gas generator wiring 3, but a pair of stranded wires are used in the motor wiring 5. Consequently, even when noise is transmitted from the motor wiring to the gas generator wiring, the direction of the noise is reversed per half-pitch of the pair of stranded wires to offset the noise in one pitch so that the noise to be transmitted is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pretensioner for pretensioning a seatbelt by the pressure of gas generated from a gas generator, and a seatbelt rewind having a mechanism for rewinding the seatbelt by a motor. It concerns the device.

[0002]

[Prior art]

A seatbelt including a pretensioner for pretensioning a seatbelt by the pressure of gas generated from a gas generator and a mechanism for winding the seatbelt by a motor. In the winding device, the wiring from the control device to the gas generator and the wiring from the control device to the motor run in parallel on the same wiring path.

Therefore, care has been taken to prevent the gas generator from malfunctioning due to noise caused by the current driving the motor. That is, the gas generator and the motor are designed such that the magnitude of noise caused by the current driving the motor is sufficiently smaller than the voltage for operating the gas generator.

[0004] However, even if attention is paid to safety when the vehicle is shipped, a different gas generator or motor may be installed at the subsequent maintenance stage. May lead to malfunction of the gas generator. Therefore, it is preferable to minimize the noise transmitted from the motor wiring to the gas generator wiring.

The present invention has been made in view of such circumstances, and it is an object of the present invention to minimize noise transmitted from a motor wiring to a gas generator wiring.

[0006]

A first means for solving the above problems is a pretensioner for applying a pretension to a seatbelt by a pressure of gas generated from a gas generator, and a winding of the seatbelt by a motor. A seat belt winding device comprising a mechanism for performing the following, one of the wiring from the control device to the gas generator and the motor,
A seat belt winding device (Claim 1) characterized by being twisted.

In this means, since one of the wires from the control device to the gas generator and the motor is twisted, noise generated between them is canceled for each one-pitch twist. Therefore, the magnitude of noise transmitted from the motor wiring to the gas generator can be significantly reduced.

[0008] A second means for solving the above problems is as follows.
A seatbelt retractor comprising a pretensioner for applying pretension to a seatbelt by pressure of gas generated from a gas generator and a mechanism for winding a seatbelt by a motor. A seat belt retractor (Claim 2), wherein both the container and the wiring to the motor are twisted, and the pitch of the twist is different.

In this means, both wires from the control device to the gas generator and the motor are twisted,
Since the twist pitches are different, the magnitude of noise transmitted from the motor wiring to the gas generator can be significantly reduced, as in the first aspect. Further, since the wiring from the control device to the gas generator is twisted, the influence of noise coming from outside can be reduced.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating wiring of a seat belt retractor according to a first embodiment of the present invention. In FIG. 1, 1 is a control device, 2 is a gas generator of a pretensioner, 3 is a gas generator wiring, 4 is a winding motor, 5 is a motor wiring, and 6 is a wiring path.

From the control device 1, a gas generator wiring 3 is connected to a gas generator 2 in the seat belt retractor, and a motor wiring 5 is connected to a winding motor 4.
Pass through. Of these, a normal parallel wiring is used for the gas generator wiring 3, but a twisted pair wire is used for the motor wiring 5.

Therefore, even if noise is transmitted from the motor wiring to the gas generator wiring, the direction of the noise is reversed for each half pitch of the twisted pair wire, so that the noise is offset by one pitch and eventually transmitted. The amount of noise will be small. According to the results of the experiments by the inventors, when a twisted pair wire having a wiring distance of 3 m and a pitch of 10 cm was used, the amount of noise could be reduced to 1/5 or less of that when the normal wiring was used. Note that the same result can be obtained by using a twisted pair wire for the gas generator wiring 3 and a parallel wiring for the motor wiring.

FIG. 2 is a diagram showing wiring of a seat belt retractor according to a second embodiment of the present invention. 2 denote the same components as those shown in FIG. In FIG. 2, both the gas generator wiring 3 and the motor wiring 5 are twisted pairs, but the pitches are different. Therefore, when viewed relatively, this is equivalent to the case where one is a parallel wiring and the other is a twisted pair, and has the same effect as that shown in FIG. In addition, when the gas generator wiring 3 is a twisted pair wire, noise coming from the outside also
This can be reduced.

[0014]

As described above, in the present invention, the magnitude of noise transmitted from the motor wiring to the gas generator can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing wiring of a seat belt retractor according to a first embodiment of the present invention.

FIG. 2 is a diagram showing wiring of a seat belt retractor according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Control device 2 ... Pre-tensioner gas generator 3 ... Gas generator wiring 4 ... Winding motor 5 ... Motor wiring 6 ... Wiring path

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Koji Tanaka 1- 4-30 Roppongi, Minato-ku, Tokyo Takata F-term (reference) 3D018 MA02 PA01

Claims (2)

[Claims] 1. A seat belt winding device comprising: a pretensioner for pretensioning a seat belt by pressure of gas generated from a gas generator; and a mechanism for winding the seat belt by a motor. A seat belt winding device, wherein one of wires from a control device to a gas generator and a motor is twisted. 2. A seat belt winding device comprising: a pretensioner for applying pretension to a seat belt by pressure of gas generated from a gas generator; and a mechanism for winding the seat belt by a motor. A seat belt winding device, wherein both wirings from a control device to a gas generator and a motor are twisted, and a twisting pitch is different.