JPH10167001A - Brake interlocking type pretensioner of seatbelt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the restriction property of a seat sitter by eliminating the looseness of a webbing when a car is going to stop suddenly and prevent an oppressive feeling of the sitter at the non-operation time of a brake pedal. SOLUTION: A tongue plate is loosely fitted to a webbing installed on the body of one side of a seat and a buckle 16 on which the tongue plate can be engagingly locked is installed on the tip of a plate engagingly locking tool 14 whose base end is installed on the body of the other side of the seat. The base end of the air cylinder 17 of the plate engagingly locking tool is installed on the body and a piston 18 is stored in the air cylinder. The buckle is installed on the tip of a piston rod 19 whose base end is installed on the piston and the piston is energized by the spring 21 in the air cylinder to the tip of the air cylinder. A brake valve is provided in the air pipe passage 23 for connecting the air cylinder with an air tank and this valve adjusts the pressure of a compressed air supplied to the air cylinder in response to the pedaling amount of the brake pedal for an air brake unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pretensioner for tightening a seat belt in conjunction with a brake operation to eliminate slack in the seat belt.

[0002]

2. Description of the Related Art Conventionally, as a pretensioner, at least one of a spring case and a winding shaft of a belt retractor that winds up a webbing so as to be able to be fed out is rotationally driven by a driving means, and a vehicle speed sensor detects a vehicle speed. Control means for controlling the driving means based on the detection output of the vehicle speed sensor so as to match the relationship between the predetermined vehicle speed and the winding force of the belt retractor. A belt retractor has been disclosed (Japanese Utility Model Laid-Open No. 59-122555). In this belt retractor, the winding force of the belt retractor changes according to the vehicle speed, so that the safety particularly at high speed running is improved.

[0003]

However, in the above-mentioned conventional belt retractor having a speed-sensitive variable winding force, the webbing is loosened at the time of deceleration, and the safety of the seat occupant cannot be sufficiently ensured at the time of an abrupt stop. There was fear. In addition, the above-described conventional belt retractor having a speed-sensitive variable winding force has a problem that a feeling of pressure is generated during high-speed running. An object of the present invention is to improve the restraint of the occupant in the seat by reliably eliminating the slack of the webbing when trying to stop suddenly, and the occupant may feel a sense of oppression when the brake pedal is not depressed. Another object of the present invention is to provide a seat belt brake interlocking pretensioner.

[0004]

The invention according to claim 1 is
As shown in FIGS. 1 and 3, the vehicle body 11 on one side of the seat 12 or the webbing attached to one side of the seat 12 and having the tongue plate loosely fitted thereto, and the base end of the vehicle body 11 on the other side of the seat 12 Alternatively, the present invention is an improvement of the seat belt 13 including a plate locking device 14 provided with a buckle 16 attached to the other side surface of the seat 12 and having a tongue plate releasably locked at a tip thereof. Its characteristic configuration is that the plate locking member 14 has an air cylinder 17 whose base end is attached to the vehicle body 11 on the other side of the seat 12 or the other side surface of the seat 12,
Piston 18 slidably housed in air cylinder 17
The base end is attached to the piston 18 and the air cylinder 17
A piston rod 19 having a buckle 16 attached to a tip protruding therefrom; and a spring 21 housed in the air cylinder 17 and urging the piston 18 toward the tip of the air cylinder 17.
And an air cylinder 17 provided in an air conduit 23 connecting the air cylinder 17 to an air tank 22 in accordance with an amount of depression of a brake pedal 24 a for an air brake unit 27.
And a brake valve 24 for adjusting the pressure of the compressed air supplied to the vehicle.

[0005] In the seat belt brake interlocking pretensioner according to the first aspect, when the brake pedal 24a is depressed, compressed air having a pressure corresponding to the depressed amount of the pedal 24a is transmitted to the air cylinder 1 via the brake valve 24.
The piston rod 19 is supplied into the air cylinder 17 against the elastic force of the spring 21 and the slack of the webbing is eliminated. When the foot is released from the brake pedal 24a, the compressed air in the air cylinder 17 is discharged from the brake valve 24, the piston rod 19 projects from the air cylinder 17 by the elastic force of the spring 21, and the webbing is loosened.

The invention according to a second aspect is the invention according to the first aspect, and furthermore, as shown in FIG. 4, an introduction pipe 51 connecting the air cylinder 17 and the brake valve 24 in the air pipe 23. Is provided with a pressure regulator 52, and a check valve 5
3 is connected. In the seat belt brake interlocking pretensioner according to the second aspect, when the brake pedal 24a is depressed by a predetermined amount or more, the introduction pipe 5
1, the pressure of the compressed air in the introduction pipe line 51 connecting the regulator 52 and the brake valve 24 becomes a predetermined value or more, the regulator 52 opens, and the compressed air is supplied to the air cylinder 17. The webbing is pulled into the air cylinder 17 against the elastic force of the spring, and the webbing is not loosened. When the foot is released from the brake pedal 24a, the compressed air supplied to the air cylinder 17 returns to the brake valve 24 via the check valve 53 and is discharged, so that the piston rod is released from the air cylinder 17 by the elastic force of the spring. It protrudes and the webbing is loosened.

[0007]

Next, a first embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 3, a driver's seat 12 is mounted on a floor panel 11 of a cab of the truck 10, and a seat belt 13 for restraining a driver is provided on the driver's seat 12. Seat belt 13
Is a three-point seat belt in this embodiment, which is provided with a webbing (not shown) to which a tongue plate (not shown) is loosely fitted, and a buckle 16 at the tip end of which the tongue plate is detachably locked. And a plate locking tool 14. One end of the webbing is attached via a wrap outer anchor to a floor panel on one side of the driver's seat 12 of the floor panel 11 to which the driver's seat 12 is attached, not shown, and the other end is accommodated in a quarter pillar (not shown). Rolled up by the retractor. The base end of the plate locking member 14 is attached to the floor panel 11 on the other side of the driver's seat 12 among the floor panels 11 to which the driver's seat 12 is attached (FIG. 3).

In this embodiment, the driver's seat is described as a seat, but a passenger seat or another seat may be used.
Further, in this embodiment, one end of the webbing is attached to the floor panel on one side of the driver's seat, and the base end of the plate locking member is attached to the floor panel on the other side of the driver's seat. It may be mounted on one side of the driver's seat and the base end of the plate locking member may be mounted on the other side of the driver's seat. Further, the pretensioner of the present invention is not a three-point seat belt but a two-point seat belt.
It is also applicable to point type seat belts.

As shown in detail in FIGS. 1 and 2, the plate locking device 14 includes an air cylinder 17 having a base end mounted on the floor panel 11, a piston 18 slidably received in the air cylinder 17, and A piston rod 1 having a proximal end attached to a piston 18 and a buckle 16 pivotally attached to a distal end projecting from an air cylinder 17 via a pin 19a.
9, a spring 21 housed in the air cylinder 17, and an air line 23 connecting the air cylinder 17 to the air tank 22.
And a brake valve 24 provided at the end. The base end of the air cylinder 17 is connected to the floor panel 11 via a pin 17a.
(FIG. 3), the piston 1 is in the air cylinder 17.
8 divides into a compressed air supply / discharge chamber 17b and a spring accommodating chamber 17c. A compressed air supply / discharge port 17d facing the compressed air supply / discharge chamber 17b is formed on a side surface near the distal end, that is, near the upper end of the air cylinder 17, and a spring storage chamber 17c is provided on a side surface near the base end, that is, near the lower end of the air cylinder 17. Breathing hole 1 facing
7e is formed. The spring 21 is a compression coil spring in this embodiment.
c. The spring 21 is configured to bias the piston 18 toward the distal end of the air cylinder 17, that is, toward the upper end. In addition, a rubber bellows cover 26 that covers the piston rod 19 is provided between the buckle 16 and the air cylinder 17.

As shown in detail in FIG. 3, the truck 10 is provided with an air brake unit 27 as a braking device for the truck 10. This air brake unit 2
Numeral 7 denotes an air-over hydraulic brake unit in this embodiment.
And a brake booster 31 connected via the relay valve 29 and outputs low-pressure compressed air to output high-pressure oil, and is disposed on the front wheel 32 and the rear wheel 33 via a hydraulic line 34 to the brake booster 31. A wheel cylinder 36 connected thereto and presses a brake shoe (not shown) against a wheel (not shown) by high-pressure oil generated by the brake booster 31; The brake valve 24 is connected to the relay valve 2 via a signal pressure line 37.
9 is connected. A brake pedal 24a operated by a driver's foot is pivotally mounted on the upper surface of the brake valve 24. The brake valve 24 converts the compressed air supplied from the air tank 22 into a pressure proportional to the amount of depression of the brake pedal 24a and relays it. It can be supplied to the valve 29 and the air cylinder 17.

The spring 21 has a relatively large spring coefficient so that the piston 18 does not move downward when the pressure of the compressed air due to the depression of the brake pedal 24a is smaller than a predetermined amount (FIGS. 1 to 3). ). Although a truck is used as a vehicle in this embodiment, this is merely an example, and a vehicle other than a truck may be used as long as the vehicle is equipped with an air brake unit having an air tank and a brake valve. Further, in this embodiment, an air overhydraulic brake unit that converts air pressure into hydraulic pressure and brakes wheels is described as an air brake unit, but a full air brake unit that brakes wheels only with air pressure may be used.

The operation of the seat belt brake interlocking pretensioner configured as described above will be described. The driver seated in the driver's seat 12 of the truck 10 has a seat belt 13
When the brake pedal 24a is normally depressed, such as during deceleration or during a normal stop, the compressed air having a pressure proportional to the amount of depression of the pedal 24a is released. Is supplied from the air tank 22 into the air cylinder 17 via the At this time, since the depression amount of the brake pedal 24a is less than a predetermined amount, the spring 2 is depressed by the force of pressing down the piston 18 by the compressed air.
The elastic force of 1 is larger, the piston 18 does not move downward and is kept in the state shown in FIG. 1, and the driver does not feel the feeling of pressure due to the tightening of the webbing (not shown).

In order to stop suddenly, brake pedal 2
When the stepping amount of the piston 4a is set to a predetermined amount or more, the force for pushing down the piston 18 by the compressed air becomes larger than the elastic force of the spring 21, and the force for pushing down the piston 18 and the spring 2
The piston 18 moves downward to a position where the elastic force of the piston 18 is balanced (FIG. 2). As a result, since the slack of the webbing is eliminated, the seat belt 13 in the case of a sudden stop is used.
The driver's restraint due to is improved. When the brake pedal 24a is released after a sudden stop, the air cylinder 1
The compressed air in 7 is discharged from the brake valve 24, and the piston rod 18 projects from the air cylinder 17 by the elastic force of the spring 21. As a result, the webbing is loosened, so that the driver does not feel a feeling of pressure due to the tightening of the webbing.

FIG. 4 shows a second embodiment of the present invention.
4, the same reference numerals as those in FIG. 3 indicate the same parts. In this embodiment, a pressure regulator 52 is provided in an introduction line 51 connecting the air cylinder 17 and the brake valve 24 in the air line 23, and a check valve 53 is provided in the introduction line 51 in parallel with the regulator 52. Connected. The regulator 52 is configured to open when the pressure of the compressed air in the introduction pipe 51 connecting the regulator 52 and the brake valve 24 in the introduction pipe 51 becomes equal to or higher than a predetermined value. The check valve 53 is configured to allow the flow of the compressed air from the air cylinder 17 to the brake valve 24 and to prevent the flow of the compressed air from the brake valve 24 to the air cylinder 17.

In the seat belt brake interlocking pretensioner constructed as described above, the brake pedal 24a is used.
Is more than a predetermined amount, the introduction pipe 51 connecting the regulator 52 and the brake valve 24 in the introduction pipe 51
When the pressure of the compressed air in the inside becomes a predetermined value or more, the regulator 52 opens, and the compressed air is supplied to the air cylinder 17,
When the foot is released from the brake pedal 24a, the air cylinder 1
The operation is substantially the same as that of the first embodiment except that the compressed air supplied to 7 is returned to the brake valve 24 via the check valve 53 and is discharged. I do.

[0016]

As described above, according to the present invention, the base end of the air cylinder of the plate stopper having the buckle at the tip is attached to the vehicle body or the seat, and the piston housed in the air cylinder is connected to the piston rod. A spring contained in the air cylinder urges the piston toward the distal end of the air cylinder, and a brake valve provided in an air line connecting the air cylinder to the air tank provides a brake for the air brake unit. Since the pressure of the compressed air supplied to the air cylinder is adjusted according to the amount of depression of the pedal, when the brake pedal is depressed, the compressed air of the pressure corresponding to the amount of depression of the pedal passes through the brake valve. The piston rod is drawn into the air cylinder against the elastic force of the spring. As a result, the slack of the webbing is eliminated, so that the restraint of the occupant on the seat when trying to stop suddenly is improved. When the foot is released from the brake pedal, the compressed air in the air cylinder is discharged from the brake valve, and the piston rod projects from the air cylinder by the elastic force of the spring. As a result, when the brake pedal is not depressed, the webbing is slackened, so that the occupant of the seat does not feel a sense of oppression.

Further, if a pressure regulator is provided in an introduction pipe connecting the air cylinder and the brake valve in the air pipe, and a check valve is connected to the introduction pipe in parallel with the regulator, the brake pedal is depressed by a predetermined amount or more. Then, the pressure of the compressed air in the introduction pipe connecting the regulator and the brake valve in the introduction pipe becomes equal to or higher than a predetermined value. As a result, the regulator is opened, compressed air is supplied to the air cylinder, and the piston rod is drawn into the air cylinder against the elastic force of the spring. The restraint of the occupant to the seat is improved. When you release your foot from the brake pedal,
The compressed air supplied to the air cylinder returns to the brake valve via the check valve. As a result, the piston rod protrudes from the air cylinder by the elastic force of the spring, and the webbing is loosened, so that the occupant of the seat does not feel a feeling of pressure.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a plate locking device that is a seat belt brake interlocking pretensioner according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view corresponding to FIG. 1, showing a state in which compressed air is supplied to an air cylinder of the plate locking device and a piston rod is retracted into the air cylinder.

FIG. 3 is a configuration diagram of an air brake unit including the plate locking member and a brake valve.

FIG. 4 is a configuration diagram corresponding to FIG. 3 showing a second embodiment of the present invention.

[Explanation of symbols]

 11 floor panel (vehicle body) 12 driver's seat (seat) 13 seat belt 14 plate locking member 16 buckle 17 air cylinder 18 piston 19 piston rod 21 spring 22 air tank 23 air line 24 brake valve 24a brake pedal 27 air brake unit 51 introduction Pipe line 52 Pressure regulator 53 Check valve

Claims (2)

[Claims] 1. A webbing to which a tongue plate is loosely fitted and attached to a vehicle body (11) on one side of a seat (12) or one side of the seat (12), and a base end of which is other than the seat (12). A buckle (1) which is attached to the side of the vehicle body (11) or the other side of the seat (12) and at which the tongue plate is detachably locked at the tip.
In the seat belt (13) provided with the plate locking device (14) provided with the (6), the plate locking device (14) has a base end on the other side of the seat (12) on the vehicle body (11). ) Or an air cylinder (17) attached to the other side of the seat (12), and a piston slidably housed in the air cylinder (17)
(18), a base end of which is attached to the piston (18) and the air cylinder
A piston rod (19) having the buckle (16) attached to a tip protruding from the (17); and a piston (18) housed in the air cylinder (17) attached to a tip side of the air cylinder (17). The air spring (21) and an air pipe (23) connecting the air cylinder (17) to the air tank (22) are provided in accordance with the amount of depression of a brake pedal (24a) for an air brake unit (27). The air cylinder
A brake interlocking pretensioner for a seat belt, comprising: a brake valve (24) for adjusting the pressure of compressed air supplied to (17). 2. The air cylinder (1) in an air line (23).
A pressure regulator (52) is provided in an introduction pipe (51) connecting the 7) and the brake valve (24), and a check valve (53) is provided in the introduction pipe (51) in parallel with the regulator (52). When the pressure of the compressed air in the introduction pipe (51) connecting the regulator (52) and the brake valve (24) in the introduction pipe (51) becomes equal to or higher than a predetermined value. The regulator
(52) is opened to supply compressed air to the air cylinder (17), and the check valve (53) is configured to supply compressed air from the air cylinder (17) to the brake valve (24). The seat belt brake interlocking pretensioner of claim 1, wherein the pretensioner is configured to permit flow and prevent flow of compressed air from the brake valve (24) to the air cylinder (17).