JPH0891232A - Impact absorbing device for vehicle - Google Patents

Abstract

PURPOSE: To lower impact caused by a collision, and also sufficiently restrain high load from being concentrated to a driver by supplying with and emptying of working fluid relatively between a bumper supporting cylinder and a column supporting cylinder when a vehicle has a head-on collision with the other. CONSTITUTION: A hold member 39 is bent up, a front bumper 30 is retreated, and when impact force is applied to a bumper supporting cylinder 29 because of a head-on collision caused by vehicles, its cylinder side chamber becomes high in pressure, and flame retardant fluid high in pressure is fed with pressure to the piston side chamber 23 of a column supporting cylinder 21 through a pipeline 27, on the other hand, its cylinder side chamber 22 becomes high in pressure, and the flame retardant fluid high in pressure is fed with pressure to the piston side chamber 32 of the bumper supporting cylinder 29 through pipeline 28. Therefore, impact from the front bumper 30 can be absorbed by the cushioning action of the bumper supporting cylinder 29. Since a hold member 38 is bent up by the action of the column supporting cylinder 21, and a column supporting member is inclined forward so as to be moved forward, a steering wheel is thereby parted from a driver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle shock absorber, and more particularly to a cab-over type truck shock absorber.

[0002]

2. Description of the Related Art When a vehicle collides head-on, as shown in FIG. 4, in the passenger car, the chest N of the driver M interferes with the steering wheel 1 and the load from the driver M is received by the steering wheel 1 as a whole. It is designed to absorb shocks.

On the other hand, in the cab-over type truck, as shown in FIG.
The layout is different from that of passenger cars, as shown in
Since the chest N of the steering wheel interferes with the rim portion 1a of the steering wheel 1, the entire steering wheel 1 cannot absorb it. Therefore, the driver M of the cab-over truck is more damaged than the passenger car.

Therefore, as shown in FIG. 6, after the chest portion N interferes with the rim portion 1a of the steering wheel 1, a shock absorption having a belt-shaped plate 5a that bends when a certain force or more is applied through the column support member 2 is obtained. The structure in which the member 5 is connected between the instrument panel (not shown) and the column support member 2 via the brackets 3 and 4 is adopted (actual fair 6-2).
9150 publication).

[0005]

However, in the case of a head-on collision, as shown in FIG. 7, the belt-shaped plate 5 of the shock absorbing member 5 is used.
Since a was simply bent, it was not possible to sufficiently suppress the high load from intensively acting on the driver.

An object of the present invention is to provide a shock absorbing structure for a vehicle, which can reduce the shock at the time of a frontal collision of the vehicle and can sufficiently suppress the concentrated application of a high load to the driver. It is in.

[0007]

According to a first aspect of the present invention for achieving the above object, a shaft connected to a steering wheel of a vehicle is inserted into a column tube, and the column tube is supported by a column supporting member. In the vehicle impact absorbing device, the bottom side of the column support member is fixed to the cab floor via a fixing member, the upper side of the column support member is supported by the instrument panel, and the front bumper is supported by the frame. A bumper supporting cylinder, in which the piston side is fixed to the frame and the cylinder side is fixed to the front bumper, is provided between and, and the piston side is fixed to the instrument panel between the upper side of the column support member and the instrument panel. Column support cylinder whose cylinder side is fixed to the column support member side And a cylinder side chamber of the bumper supporting cylinder, a piston side chamber of the column supporting cylinder, a cylinder side chamber of the column supporting cylinder and a piston side chamber of the bumper supporting cylinder are respectively connected by piping, and the front bumper and Between the frame,
A holding member that bends when a certain load or more is operated through the front bumper is interposed, and a column supporting cylinder connected to the bumper supporting cylinder is operated between the upper side of the column supporting member and the instrument panel. A holding member that bends when a load of a certain amount or more is actuated via the column supporting member is interposed.

The invention of claim 2 is characterized in that the bumper supporting cylinder, the column supporting cylinder, and the pipe connecting the both cylinders are filled with a flame-retardant liquid.

According to a third aspect of the present invention, the fixing member is formed with a notch portion that is sheared when a column supporting cylinder operates and a load of a certain amount or more acts on the column supporting member. .

[0010]

According to the invention of claim 1, the vehicle collides head-on,
When a certain amount of load is applied to the holding member via the front bumper, the holding member bends and the front bumper retracts, and the liquid filled from the cylinder side chamber of the bumper supporting cylinder passes through the pipe to support the column. The liquid is pumped to the piston side chamber of the column supporting cylinder, and the liquid is pumped from the cylinder side chamber of the column supporting cylinder to the piston side chamber of the bumper supporting cylinder through the pipe.

When a load of a certain amount or more is applied to the holding member via the column supporting member due to the operation of the column supporting cylinder, the holding member is bent, and the column supporting member is pulled with the fixed member as a fulcrum to be pulled forward. It is tilted.

Therefore, in the event of a frontal collision, the shock of the bumper supporting cylinder reduces the impact of the front bumper, and the steering wheel is far away from the driver, and the chest of the driver interferes with the rim of the steering wheel. Even if the driver's chest interferes with the rim of the steering wheel, the impact absorption effect of the column supporting cylinder prevents the driver from being subjected to a high load.

According to the second aspect of the present invention, even if the flame-retardant liquid filled in the bumper supporting cylinder, the column supporting cylinder, and the pipe connecting the both cylinders leaks due to the impact, the flame-retardant Fire is less likely to occur because the volatile liquid is less likely to catch fire.

According to the third aspect of the present invention, when a fixed load or more is applied to the fixing member via the column supporting member due to the operation of the column supporting cylinder, the mechanically weak notch formed in the fixing member. Since the column support member is tilted forward by shearing from the cab floor, the cab floor fixing the fixing member is not damaged.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of an essential part of a shock absorbing device for a cabover type truck showing an embodiment of the invention of claims 1 to 3, FIG. 2 is a front side view of the cabover type truck, and FIG. 3 is a bumper support thereof. It is a piping block diagram of a cylinder for column and a cylinder for column support.

1 to 3, a steering wheel 11 for steering is arranged in a cab 10 of a cab-over type truck. The steering wheel 11 is connected to the main shaft 12. The main shaft 12 is inserted into the column tube 13,
It is connected to a pinion (not shown) via the joint 14, the intermediate shaft 15, and the joint 16.

Incidentally, when the steering wheel 11 is rotated, the rotational torque is transmitted to the pinion through the joint 14, the intermediate shaft 15 and the joint 16.

The upper portion of the column tube 13 is supported by the column support member 17. This column support member 17
Is formed in a substantially U shape, and an L-shaped bracket 18 is provided on the upper side, while an L-shaped fixing member 19 is provided on the bottom side. The fixing member 19 has mounting holes formed at both ends thereof and is fixed to the cab floor 37 with bolts or the like.

Between the column support member 17 and the instrument panel 26, a column support cylinder 21 for absorbing impact is provided, and the column support cylinder 21 is operated to move the column support member 17 into place. A holding member 38 that bends when a load of a certain amount or more is applied is interposed.

An L-shaped bracket 20 is connected to the bracket 18, and the column supporting cylinder 21 having a bracket 20a at the tip thereof is connected to the bracket 20.
Are connected. The column supporting cylinder 21 is
As shown in FIG. 3, the piston 2 is installed in the cylinder body 21a.
4 is reciprocally inserted so that a cylinder side chamber 22 and a piston side chamber 23 are provided.

Piston 24 of column supporting cylinder 21
The end of the piston rod 25 connected to is fixed to the instrument panel 26. On the other hand, a bracket 20a is provided on the cylinder body 21a, and the column supporting cylinder 21 is connected to the column supporting member 17 via the brackets 20 and 18.

That is, the column supporting cylinder 21 is shown in FIG.
As shown in FIG. 3, it is arranged between the column support member 17 and the instrument panel 26. The piston side of the column supporting cylinder 21 is fixed to the instrument panel 26, and the column supporting member 17 is fixed on the cylinder side.
Is fixed.

On the other hand, between the front bumper 30 and the frame 31, a bumper cylinder 29 for absorbing impact is provided.
And a holding member 39 that bends when a load of a certain amount or more is applied via the front bumper 30.

The bumper supporting cylinder 29 is provided with a piston side chamber 32 and a cylinder side chamber 33 in which a piston 34 is reciprocally inserted in the cylinder body 29a.

The end of the piston rod 35 connected to the piston 34 of the bumper supporting cylinder 29 is fixed to the frame 31. On the other hand, the front bumper 30 is connected to the cylinder body 29a.

That is, the bumper supporting cylinder 29 is shown in FIG.
It is arranged between the front bumper 30 and the frame 31, as shown in FIG. Then, the bumper supporting cylinder 29
The piston side is fixed to the frame 31, and the front bumper 30 is fixed to the cylinder side.

The cylinder side chamber 33 of the bumper supporting cylinder 29 and the piston side chamber 2 of the column supporting cylinder 21.
3 and the cylinder side chamber 22 of the column supporting cylinder 21 and the piston side chamber 32 of the bumper supporting cylinder 29 are shown in FIG.
The pipes 27 and 28 are connected as shown in FIG.

The bumper supporting cylinder 29, the column supporting cylinder 21 and the pipes 27 and 28 connecting the cylinders 29 and 21 are connected to a fireproof SG of a flame retardant liquid such as glycol-based hydraulic oil or a reverse. It is filled with fireproof 56E (both are trade names) of emulsion hydraulic oil.

When the vehicle collides head-on, the flame-retardant liquid is pumped from the cylinder side chamber 33 side of the bumper supporting cylinder 29 to the piston side chamber 23 of the column supporting cylinder 21 through the pipe 27 to support the column. The flame-retardant liquid is pumped from the cylinder side chamber 22 side of the cylinder 21 to the piston side chamber 32 of the bumper supporting cylinder 29 via the pipe 28.

The column supporting cylinder 2 is attached to the bottom side fixing member 19 to which the column supporting member 17 is fixed.
A notch portion 36 is formed of two notch grooves extending in parallel to the front-rear direction, which is sheared when 1 is operated and a certain load or more is applied via the column support member 17.

Next, the operation of the above embodiment will be described. When a vehicle collides head-on and a load of a certain amount or more acts on the holding member 39 via the front bumper 30, the holding member 39 bends and the front bumper 30 retracts to move the front bumper 3
When an impact force is applied to the bumper supporting cylinder 29 from 0,
The cylinder side chamber 33 of the bumper supporting cylinder 29 has a high pressure, and the high pressure flame-retardant liquid is pumped from the cylinder side chamber 33 to the piston side chamber 23 of the column supporting cylinder 21 via the pipe 27, and the column supporting cylinder 21 The cylinder side chamber 22 has a high pressure, and the high pressure flame-retardant liquid is pumped from the cylinder side chamber 22 to the piston side chamber 32 of the bumper supporting cylinder 29 via the pipe 28.

Therefore, the impact from the front bumper 30 is absorbed by the impact absorbing action of the bumper supporting cylinder 29, and the impact due to the frontal collision is reduced. Further, when the column supporting cylinder 21 connected to the bumper supporting cylinder 29 is actuated to apply a load of a certain amount or more to the holding member 38 via the column supporting member 17, the holding member 38 is bent and the column supporting member 17 is bent. Is forcibly pulled around the fixed member 19 as a fulcrum and tilted forward, so that the steering wheel 11 moves away from the driver. for that reason,
The driver's chest is the rim portion 11 of the steering wheel 11.
It becomes difficult to interfere with a, and even if it interferes at that time, the high load does not act on the driver due to the impact absorbing action of the column supporting cylinder 21.

At the time of collision, the flame-retardant liquid filled in the bumper supporting cylinder 29, the column supporting cylinder 21 or the pipes 27 and 28 connecting the both cylinders 29 and 21 is temporarily assumed. Even if it leaks, the flame-retardant liquid is a liquid that is hard to catch fire, so a fire is unlikely to occur.

At this time, if a certain amount of load is applied to the fixing member 19 via the column supporting member 17, the mechanically weak notch 36 formed in the fixing member 19 fixed to the cab floor 37 by a bolt or the like. Since it is sheared, damage to the cab floor 37 can be prevented.

It is to be noted that the holding members 38 and 39 that bend when a certain amount of force or more is applied between the column support member 17 and the instrument panel 26 and between the front bumper 30 and the frame 31. Therefore, the pistons 24 and 34 are usually located substantially at the centers of the cylinder main bodies 21a and 29a of the column supporting cylinder 21 and the bumper supporting cylinder 29, respectively, and the column supporting member 17 and the front bumper 30 are respectively disposed. I support you.

[0036]

As described above, according to the first aspect of the present invention, it is possible to reduce the impact at the time of a frontal collision of the vehicle and to sufficiently suppress the concentrated application of the high load to the driver. Therefore, the driver can be sufficiently protected from the impact force.

According to the second aspect of the present invention, since the flame-retardant liquid is filled in the bumper supporting cylinder, the column supporting cylinder, and the pipe connecting the both cylinders, the flame-retardant liquid leaks at the time of collision. Is also unlikely to cause a fire.

Further, according to the invention of claim 3, since the notch is formed in the fixing member, when a load of a certain amount or more acts on the fixing member through the column supporting member, the notch is sheared. It also prevents damage to the cab floor.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an essential part of a cab-over type truck shock absorbing device showing an embodiment of the present invention.

FIG. 2 is a side view on the front side of the cab-over type truck of the embodiment.

FIG. 3 is a piping configuration diagram of a bumper supporting cylinder and a column supporting cylinder of the embodiment.

FIG. 4 is a diagram for explaining a load generated in a frontal collision of a passenger vehicle.

FIG. 5 is a diagram for explaining a load generated in a frontal collision of a cab-over truck.

FIG. 6 is an exploded perspective view of a main part of a conventional cab-over type steering column for a truck.

FIG. 7 is a diagram for explaining a deformed state of a conventional shock absorbing member.

[Explanation of symbols]

 10 Cab 11 Steering Wheel 12 Main Shaft 13 Column Tube 17 Column Support Member 19 Fixing Member 21 Column Support Cylinder 22, 33 Cylinder Side Chamber 23, 32 Piston Side Chamber 26 Instrument Panel 27, 28 Piping 29 Bumper Support Cylinder 30 Front Bumper 36 Notch 37 Cab floor 38, 39 Holding member

Claims (3)

[Claims] 1. A shaft connected to a steering wheel of a vehicle is inserted into a column tube, the column tube is supported by a column supporting member, and the bottom side of the column supporting member is fixed to a cab floor via a fixing member. In a vehicle shock absorber in which an upper side of a support member is supported by an instrument panel and a front bumper is supported by a frame, a piston side is fixed to the frame and a cylinder side is fixed to the front bumper between the front bumper and the frame. A bumper supporting cylinder is provided, and a column supporting cylinder having a piston side fixed to the instrument panel and a cylinder side fixed to the column supporting member side is provided between the upper side of the column supporting member and the instrument panel. , The cylinder side chamber of the cylinder for supporting the bumper and collapsing The piston side chamber of the column supporting cylinder, the cylinder side chamber of the column supporting cylinder, and the piston side chamber of the bumper supporting cylinder are connected by pipes, respectively, and between the front bumper and the frame, a certain amount or more is provided via the front bumper. A holding member that bends when the load is actuated is interposed, and between the upper side of the column support member and the instrument panel, a column support cylinder that is connected to the bumper support cylinder operates and the column support member is interposed. A shock absorbing device for a vehicle, wherein a holding member that bends when a load of a certain level or more is actuated is interposed. 2. A flame-retardant liquid is filled in the bumper supporting cylinder, the column supporting cylinder, and a pipe connecting the both cylinders.
The vehicle shock absorber described. 3. The fixing member is formed with a cutout portion that shears when a column supporting cylinder operates and a load of a certain amount or more is applied through the column supporting member. Vehicle shock absorber.