JPH0349976Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The disclosed technology is a brake device interposed between a tow vehicle for transporting materials in a factory and a towed vehicle towed by the tow vehicle. belongs to the technical field of structure.

<Summary of the gist> This invention is designed to be installed between the front towing vehicle such as an automatic guided vehicle used in factories and material stockyards and the towed vehicle such as the rear transport vehicle. This invention relates to a brake device for a towed vehicle that is connected to the wheel brake of the towed vehicle through a brake pipe, etc., and in particular, an outer tube installed at the front end of the towed vehicle and a brake device that can be slid back and forth within the outer tube. A rod installed inside the tow vehicle and extending and connected to the rear end of the tow vehicle, or a rod connected in the opposite manner, is connected to a hydraulic master cylinder for automobiles etc. via a push rod, and the master This invention relates to a brake device in which a cylinder is connected to a wheel brake of a towed vehicle, and when no traction force is applied, the wheel brake is applied, and when the traction force is applied, the wheel brake is released. .

<Prior art> As is well known, in factories, material stockyards, etc., in order to transport large amounts of materials, multiple materials transportation vehicles are connected vertically to the rear as towed vehicles, and the front In many cases, materials are transported by being towed by a towing vehicle such as an electric vehicle, but the front towing vehicle that connects and tows multiple towed vehicles with a simple structure such as an automatic guided vehicle is used to transport materials by itself. Although a brake system was installed, the towed vehicle to which it was connected was generally not equipped with one.

Therefore, if a heavy object is loaded onto a transport vehicle and suddenly stops while being transported, even if the wheels of the front towing vehicle are locked by the brakes, a large inertia force will be exerted on the rear towed vehicle carrying the materials. This has the disadvantage that a slip phenomenon occurs, making it impossible to obtain a safe braking distance.

Additionally, in extreme cases, there were some problems that could cause cargo to collapse.

To deal with this, for example,
As disclosed in the official gazette, when the front towed vehicle is braking, the inertial force of the rear towed vehicle, which is not braked, is applied to the wheel brakes of the towed vehicle through a link mechanism to perform braking. A brake device for a towed vehicle has been devised.

<Problem to be solved by the invention> However, in order to operate the wheel brake for the towed vehicle using the link mechanism described above, it is mechanically necessary to operate the wheel brake for the towed vehicle by the inertia force between the front towed vehicle and the rear towed vehicle. Because the force is transmitted through arms and rods, the structure is extremely multiple.
In addition, there is a problem that distortion occurs in the arm or rod, making it difficult to achieve smooth and accurate braking.
Moreover, since a large load is applied to the arms and rods serving as the means for transmitting the brake force, the brake actuating device is subject to severe wear and tear, resulting in poor durability.

Another problem was that because the mechanism was mechanically connected, smooth operation was not possible.

In addition, there is a disadvantage that the mechanism is complicated and costly in order to ensure braking force and stable operation.

<Purpose of the invention> The purpose of this invention is to solve the problem of the brake system of the rear towed vehicle connected to the front tow vehicle based on the above-mentioned conventional technology, and to solve the problem when the brake of the tow vehicle is activated. It is an object of the present invention to provide an excellent braking device for a towed vehicle that enables smooth and reliable braking of a towed vehicle and thereby benefits the field of safety technology application in the vehicle industry.

<Means for solving the problem> In order to solve the above-mentioned problem, the structure of this invention, which is based on the scope of the above-mentioned utility model registration claim, is to provide a brake device for a towed vehicle towed by a towing vehicle. an outer tube, a piston that slides within the outer tube, a rod connected to the piston, and a spring that urges the piston in a direction in which the rod enters the outer tube;
It has a hydraulic master cylinder connected to the wheel brake of the towed vehicle, and a push rod that operates the hydraulic master cylinder, and one of the hydraulic master cylinder and the push rod is connected to the outer tube, and the other is connected to the piston. or the rod, one of the outer tube and the rod is connected to the towing vehicle, and the other is connected to the towed vehicle, and when no traction force is applied, the wheel brake is applied, and the traction force is applied. This is a brake device for a towing vehicle, in which the wheel brake is released by doing so.

<Function> Therefore, the outer tube installed at the front end of the towed vehicle and the rod inside the outer tube that can be slid back and forth and connected to the rear end of the towed vehicle are connected in a reverse manner. The rod is connected to a hydraulic master cylinder such as that used in automobiles through a push rod, and the master cylinder is connected to the wheel brake of the towed vehicle. The wheel brakes of the towed vehicle are applied through the inertia of the towed vehicle when the brakes are activated and the hydraulic pressure generated in the master cylinder by the spring force, and the wheel brake action is maintained by the spring force while the vehicle is stopped. A technical measure has been taken that allows the wheel brakes to be released when traction forces are applied.

<Example> Next, an example of this invention will be described below based on the drawings.

In the embodiments shown in FIGS. 1, 2, and 3, reference numeral 1 denotes a brake device for a towed vehicle, which constitutes the gist of the invention, and is used, for example, in a towed vehicle 2 of a transport vehicle for transporting materials in a machine manufacturing factory. As shown in Fig. 2, the main part of the outer tube 3, which has a circular ring-shaped cross section, has a mount 4 on the outside of the base bottom surface, and a master cylinder on the side surface of the base. and a rod-shaped stopper 6 concentrically joined and fixed to the inside of the base by welding. The flange 8 is integrally welded to the flange 8 and can be integrally connected to the flange 8 by bolts (not shown).

On the other hand, a brake operating piston 9 is concentrically housed inside the outer tube 3 so as to be able to slide back and forth, and the rear end of a front traction rod 10 is integrally connected to the brake operating piston 9 by appropriate means. The operating lever 11 is inserted into the front end of the outer tube 3 and extended forward, and the operating lever 11 is integrally connected to the upper outer surface of the brake operating piston 9 by welding, and is inserted along the axial slit 11' of the outer tube 3. It is freely movable back and forth.

The brake operating lever 11 is connected to a hydraulic master cylinder 1 for general automobiles via a push rod 13 equipped with a return spring 12.
4, the master cylinder 14 is connected to the input side of the master cylinder 14.
The output side of is connected via a brake hose 15, a brake pipe manifold 16, and a brake pipe 17 to a wheel brake 18 at the rear of the transport vehicle 2, which is also the same as that for general automobiles.

A coil spring 20 as a traction buffer is interposed between the brake operating piston 9 in the outer tube 3 and the adjuster star 19 screwed onto the tip of the outer tube 3, so that the coil spring 20 acts as a traction buffer to prevent traction during towing by the towing vehicle 21. It is designed to provide a buffer.

In the above configuration, when the towing vehicle 21 that pulls the towed vehicle 2 detects some abnormality during transportation and brakes to stop, the traction force F (not shown) changes from the state shown in FIG. 2 to the state shown in FIG. At the same time, the inertia force F' of the towed vehicle 2 is generated and applied to the towing vehicle 21 side, and as a reaction, F'' acts on the transport vehicle 2 side.

At this time, the relative force acting between the towing vehicle 21 and the towed vehicle 2 is generated between the brake operating piston 9 connected to the towing vehicle 21 and the adjuster star 19 indirectly connected to the outer tube 3. This is converted into the displacement of the inserted coil spring 20, and at the same time, the same amount of displacement is applied to the lever 11 relative to the slit 11' and transmitted to the push rod 13 through its sliding movement. The towed vehicle 2 is braked by generating hydraulic pressure and operating the wheel brake 18 of the towed vehicle 3 via the brake hose 15, brake pipe manifold 16, and brake pipe 17.

Note that the dynamic characteristics in this case are achieved extremely quickly due to hydraulic rigidity.

During this time, the braking state is maintained by the action of the coil spring 20 until the next traction force F is generated, and when the traction force F is generated at the start of operation, the coil spring 20 is compressed and the oil pressure of the master cylinder 14 becomes 0. the brake is released,
Towing is resumed.

As for the coil spring 20, since the outer tube 3 and the adjuster star 19 are screwed together, the spring length can be adjusted to a desired length according to the running resistance of the towed vehicle 21.

It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiment. For example, the front-back relationship of the brake device of this invention may be reversed from that of the above-mentioned embodiment, and the rod and outer tube may be towed together with the towed vehicle. Various modes can be adopted, such as connecting it to a car.

<Effects of the invention> As described above, according to this invention, the brake system between the towing vehicle and the towed vehicle is basically used as a brake device installed on the towing vehicle that tows the towed vehicle such as a transport vehicle and the towed vehicle. By equipping the towed vehicle with a brake system for the towed vehicle that has a simple structure that senses the braking of the towed vehicle and brakes the towed vehicle independently, energy for control and operation from the outside is not required. This provides an excellent effect of shortening the braking distance when towing a towed vehicle.

The master cylinder and wheel brakes used in this invention can be used as hydraulic types from general automobiles for towed vehicles such as lightweight transport vehicles, so the parts can be used as substitutes and replaced. Since repairs and the like are simple, the cost is extremely low.

Further, the brake actuating device utilizes hydraulic pressure to brake the towed vehicle via the master cylinder, thereby achieving the effect of enabling smoother and more accurate braking.

Furthermore, since the wheel brakes are actuated by hydraulic pressure, the brake actuating device is less likely to be damaged.

Since the brake is applied when the machine is stopped, there is an excellent effect of ensuring work safety, and there is also an effect that the brake can be released when disconnecting.

[Brief explanation of drawings]

Figures 1 to 3 are explanatory diagrams of one embodiment of this invention. Figure 1 is an external view of a towed vehicle actually being towed by a towing vehicle, and Figure 2 is an illustration of the brake operation that constitutes the gist of this invention. FIG. 3 is a partial sectional view of the device when it is in operation, and FIG. 3 is a partial sectional view of the brake actuating device when braking. 21... Towed vehicle, 2... Towed vehicle, 18... Wheel brake, 1... Brake actuation device, 3...
...Outer tube, 10...Rod, 9...Piston, 13...Push rod, 20...Spring, 14...Master cylinder.

Claims (1)

[Scope of utility model registration request] A brake device for a towed vehicle towed by a tow vehicle, which includes an outer tube, a piston that slides inside the outer tube, a rod connected to the piston, and a piston that moves the rod into the outer tube. a hydraulic master cylinder connected to a wheel brake of the towed vehicle, and a push rod for actuating the hydraulic master cylinder; The outer tube is connected to the piston or the rod at the other end, and one of the outer tube and the rod is connected to the towing vehicle and the other to the towed vehicle, and when no traction force is applied, the wheel brake is connected. 1. A brake device for a towing vehicle, characterized in that the wheel brake is released when a traction force is applied.