JPS62227881A - Device for preventing tractor and trailer from being folded - Google Patents

Abstract

PURPOSE:To avoid jack-knifing a tractor and a trailer even though braking is effected during turning, in order to prevent breakage, by providing an actuating means having a coupling means to either the tractor or the trailer in order to couple them each other, and by providing a fluid control means in the actuating means for limiting the movement at least in one direction during braking control. CONSTITUTION:A tractor 1 is coupled with a trailer 2 by means of a gear device 7 serving as an actuating means having a coupling means 2 and provided on the lower surface of the trailer 2, and a hydraulic control means 18 is disposed in the gear device 7. Then, when braking is effected particularly during turning, a shut-off valve 21 is changed over into its closed position to limit the rotation of a motor 20 as well as the rotation of the gear device 7 so that the pay-out of a cable 15 is stopped. Further, a cable 17 on the tractor 1 side is stretched under tension so that prevent the tractor 1 and the trailer from being folded further more, thereby it is possible to prevent them from jack- knifing. Accordingly, it is possible to prevent breakage.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is applied to the field of preventing the so-called jackknife phenomenon, which is a phenomenon in which the trailer and tractor bend when a trailer is coupled to a tractor and sudden braking is applied. It is something that will be used.

(b> Conventional technology Conventionally, when a tractor is towing a trailer,
When sudden braking is applied, the brakes on the trailer act more slowly than on the tractor due to the difference in the length of the air piping.

(C) Problems to be Solved by the Invention However, with the above configuration, if the brakes are applied suddenly during a turn, the trailer side brakes are slow, so the trailer uses its inertia to stop the tractor, which is applying the brakes. As the trailer is pushed forward, the tractor and trailer bend around the king pin that connects them, causing a jackknife phenomenon, and in the worst case scenario, the angle between the two becomes acute and the sides of both collide and break. There was a problem.

(d) Means for Solving the Problems The present invention solves the above-mentioned drawbacks, and is provided with an actuating means for performing linear or rotational movement on either the tractor or the trailer, and the actuating means is attached to either the tractor or the trailer. A tractor is provided with a connecting means that can be connected directly or indirectly to the other side of the trailer, and the actuating means is further provided with a fluid control means for regulating at least the movement of the connecting means in the extending direction in conjunction with brake operation. - This relates to a trailer bending prevention device.

(e) Examples Below, examples will be explained using drawings. (1) is a trailer (
2), the tractor (1) has a vehicle body (
3) is supported by wheels (4H4), and a fifth wheel mounted coupler (5) is attached to the vehicle body (3), and this coupler (5) connects the king pin (6) on the trailer (2) side.
) and connect the trailer (2) to the tractor (1).

At this time, the trailer (2) and the tractor (1) are designed to be able to bend around the kingpin (6).

(7) is a gear device with an operating means fixed to the underside of the trailer (2), and the gear bag @ (7) is connected to a shaft (9) hanging vertically from a base (8) fixed to the trailer (2). A worm wheel (10) is rotatably provided at the worm wheel (10), and a worm (11) that is rotated by the rotation of the worm wheel (10) is meshed with the worm wheel (10).

(12) is a connecting means, and the means (12) is a drum (13).
) is bolted (14) to the drum wheel (10) of the gear device (7), and the cable (15) is wound around the drum (13).

Also, inside the drum (13) is a spiral sprocket (16) whose both ends are fixed to the drum (13) and the shaft (9).
(b, the drum (13) with the spring (16)
is constantly biased in the direction of winding the cable (15).

The tip of the cable (15) is attached to the vehicle body (3) of the tractor (1).
17) It is connected to the other end so that the whole becomes Y-shaped.

(18) is a fluid control means, and in this means, 18) is a motor (20) and an on-off valve (18) in a closed circuit (19) as shown in FIG.
21) are provided in parallel.

The motor (20) is fixed to a bracket (30) suspended from a base (8) and has a pair of gears (23).
It has a structure in which the gear (23) is internally installed, and the gear (2
The worm (11) of the gear device (7) is fixed to one of the gears (3), and the rotation of the worm (11) causes the gear (23) (
23) It is designed to be rotated.

The on-off valve (21) is normally in the "open" position, and the on-off valve (21) is in the "open" position when the tractor (1) and the trailer (2) or the tractor (1)
At the same time as the brake is applied, the gears are switched to the "closed" position, thereby regulating the rotation of the gears (23) (23).

The check valve (22) is adapted to restrict the rotation of the drum (13) in the direction in which the cable (15) of the connecting means (12) is fed out, and when the on-off valve (21) is in the "closed" position. , so that it can function as a check valve (22).

It should be noted that the gear device in the embodiment can have the same effect as long as it performs rotational movement like a bevel gear.

Further, the same effect can be obtained even if the fluid control means does not include a check valve.

Figures 6 to 9 show other embodiments, and Figure 6 shows a hydraulic control means in which a motor (20), an on-off valve (21), and a check valve (22) are installed in parallel on an open circuit (24). I have something to eat.

Fig. 7 shows an example in which a hydraulic cylinder (25) that performs linear motion is used as an operating means, a cable (27) serving as a connecting means is connected to the tip of a cylinder rod (26), and a spring (29) is connected to a cylinder tube (28). ), and this spring (29) constantly biases the cylinder rod (26) in the contraction direction.

Further, the hydraulic cylinder (25) is provided with a hydraulic control means (18) consisting of a closed circuit (19).

Furthermore, the cylinder tube (28) has air handling holes (3).
1) is provided.

In FIG. 8, the tip of the cable (15) of the connecting means (12) is directly connected to the rear end of the vehicle body (3) of the tractor (1).

Figure 9 shows the actuation means, hydraulic control means and connection means (12)
is provided on the tractor (1) side, and the tip of the cable (15) of the connecting means (12) is connected to the cable (17) on the tractor (2) side.
) (17).

The present invention has the above-mentioned configuration. Next, the operation will be explained. First, when the brake is not applied, the on-off valve (21) of the fluid control means is in the "open" position, so the gear bag @ (7) is in a free state, and even if the tractor (1) turns while driving, the cable (15) can be moved by an arbitrary amount (the cable (15) is let out and can turn freely without being restricted from bending, and the tractor (1) ) is returned to its original position, the cable (15) is connected to the drum (13) by the helical spring (16).
The cable (15) is rewound to prevent the cable (15) from bending.

Next, when applying brake control, especially when applying brake control when turning, the on-off valve (21) in Fig. 4
Since the rotation of the motor (20) is restricted and the rotation of the gear device (7) is also restricted, the feeding of the cable (15) is stopped and the fifth position is switched to the "closed" position.
As shown in the figure, the cable (17) on the tractor (1) side is in tension, and the cable (17) on the tractor (1) side
) to prevent bending.

This is designed to prevent the Yatsuknife phenomenon from occurring.

At that time, when the tractor (1) is returned to its original position while the brake is still applied, the cable (15) tries to bend, but the rotation of the drum (13) in the cable winding direction is regulated by the check valve (22). Therefore, the cable (15) is wound up by the force of the helical spring (16), and the cable (15) is always
5) will not bend.

(f> Effects of the Invention As described above, the present invention provides an actuating means having a connecting means on either the tractor or the trailer, connects the connecting means to the other of the tractor or the trailer, and the actuating means has a fluid control means. Since this fluid control means restricts the movement of the actuating means in at least one direction when applying the brake, the generation of the jig-knife phenomenon as in the conventional case can be avoided even when the brake is applied during a turn. This can prevent damage to tractors and trailers.

Also, collision accidents with other vehicles can be avoided.

[Brief explanation of drawings]

Figure 1 is an overall view, Figure 2 is a top view, Figure 3 is Figure 1A-
A sectional view, FIG. 4 is a circuit diagram of the fluid control means, FIG. 5 is an operating state diagram, and FIGS. 6 to 9 are other embodiments. (1) is a tractor, (2) is a trailer, (7) is a gear device, (12) is a coupling means, and (18) is a fluid control means.

Claims (1)

[Claims] An actuating means for performing linear or rotational movement is attached to either the tractor or the trailer, and the actuating means is provided with a connecting means that can be connected directly or indirectly to the other of the tractor or trailer, and the actuating means is provided with a brake. A bending prevention device for a tractor/trailer, which is provided with a fluid control means for regulating at least a movement of a connecting means in an unwinding direction in conjunction with an operation.