JPS6224302B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an air service brake system for a motor vehicle.

In general, an automobile's air service brake system consists of an air tank, a compressor that supplies compressed air to the air tank, and a brake valve installed in the brake piping that connects the air tank to the brake chamber side. It consists of a pressure regulator, etc. installed in the air pressure control piping that connects the air tank and the suction side of the compressor, and is constructed so that the pressure inside the air tank is always maintained almost constant. It's coming.

In other words, if the pressure in the air tank is greater than or equal to the predetermined pressure, the pressure
Via the regulator, it acts on the unloader valve of that compressor and opens the suction valve of that compressor, stopping the supply of air to the air tank and reducing the pressure in that air tank to a predetermined level. When the pressure is below, conversely to the above, the pressure regulator is closed, and the suction valve of the compressor is also closed, so that air is supplied to the air tank. .

Therefore, the air supply operation of the compressor, that is, the filling of compressed air into the air tank, is performed when the compressed air is consumed by driving the car and the pressure inside the air tank falls below a predetermined pressure. ,
It is done.

However, when such an air tank is filled with compressed air, the power required to drive the compressor is taken away from the vehicle's internal combustion engine, so when the vehicle is running, In particular, when the compressor is driven during acceleration, the output of the internal combustion engine decreases, causing poor acceleration and potentially having an adverse effect on the fuel consumption rate.

It is an object of the present invention to avoid a decrease in the output of the internal combustion engine due to the drive of the compressor when the vehicle is running, especially when accelerating, to improve acceleration performance and improve fuel consumption. The purpose of the present invention is to provide an air service brake system for automobiles that improves the braking force as an engine brake and provides reliable braking during braking.

For this purpose, the air service brake system for an automobile of the present invention includes an air tank, a compressor connected to the air tank via an air pressure supply pipe, and a brake system that connects the air tank to the air service brake system.
A brake valve provided on a brake pipe connecting the chamber side, a pressure regulator provided on a pneumatic control pipe connecting the air tank and the suction side of the compressor,
a brake pedal switch provided on the brake valve side and energized when the brake pedal of the brake valve is depressed;
An electromagnetic three-way control valve provided downstream of the pressure regulator in the air pressure control piping, and an electric circuit connecting the brake pedal switch and the solenoid coil of the electromagnetic three-way control valve. We are prepared.

Hereinafter, preferred specific examples of the air service brake system for an automobile according to the present invention will be described with reference to the drawings.

The figure shows a tenth embodiment of an air service brake system for an automobile according to the present invention applied to a truck.

The car's air service brake 10
is the air tank 11 and the air tank 11.
A compressor 12 is connected to the compressor 12 via an air pressure supply pipe 20, and a brake valve 13 is provided in a brake pipe 21 that connects the air tank 11 to a brake chamber (not shown) side.
, its air tank 11 and its compressor 1
The pressure regulator 14 is installed in the air pressure control pipe 22 that connects the air pressure control pipe 22 to the suction side of the brake valve 13, and is energized when the brake pedal 15 of the brake valve 13 is depressed. break pedal·
A pressure switch 16 as a switch, an electromagnetic three-way control valve 17 provided downstream of the pressure regulator 14 in the pneumatic control piping 22, and a solenoid for the pressure switch 16 and the electromagnetic three-way control valve 17. An electric circuit 24 connecting the coil and the exhaust brake device 18 connected to the air tank 11 via the exhaust brake piping 23; A solenoid valve 19 whose opening and closing are controlled by a switch 26, and an electric circuit 2 for exhaust brake that connects the solenoid coil of the solenoid valve 19 to the electric circuit 24 described above.
5.

The air tank 11 is configured to store compressed air and separate and condense moisture contained in the compressed air, and its detailed configuration is similar to existing air tanks. Therefore, the explanation will be omitted. Of course, the air tank 11 is
A safety valve (not shown) is provided to prevent the pressure within the air tank 11 from becoming extremely high.

The compressor 12 that supplies compressed air to the air tank 11 is driven by an internal combustion engine (not shown) mounted on the truck, like existing compressors, and has an unloader valve on the suction side. (not shown) and a suction valve (not shown).

Of course, when the pressure acting on the suction side of the compressor 12 reaches a predetermined pressure or higher, the unloader valve is pushed down.
The suction valve is opened to stop air supply, and if the pressure acting on the suction side is less than a predetermined pressure, the unloader valve is lifted and the suction valve is closed. It is configured to supply air from the discharge side.

The discharge side of the compressor 12 configured in this way is connected to its air tank 11 via a pneumatic supply line 20.

Needless to say, the air pressure supply pipe 20 is provided with a check valve 36 for preventing backflow of compressed air from the air tank 11 to the compressor 12 side.

Further, the air tank 11 is connected to a brake chamber (not shown) via a brake pipe 21.
Although it is connected to the side, the brake piping 21 has
A brake valve 13 is provided that controls the amount of compressed air supplied to the brake chamber side in response to depression of the brake pedal 19.

Since the brake valve 13 is constructed in the same manner as the brake valve in the existing air service brake system, a description of its construction will be omitted.

Furthermore, the brake valve 13 includes a pressure switch 1 as a brake pedal switch.
6 is assembled.

The pressure switch 16 is configured to be normally open so that the electrical contacts are energized by compressed air when the brake pedal 15 is depressed.

Of course, the pressure switch 16 can be of any shape as long as it is a normally open type whose electrical contacts are energized when the brake pedal 15 is depressed; for example, it may be a Bourdon tube type pressure switch or the like. ,
It is also possible to apply various micro-switches.

Furthermore, the suction side of the air tank 11 and its compressor 12 described above is connected to the air pressure control piping 22.
The air pressure control pipe 22 is connected to the air pressure regulator 14 by a pressure regulator 14.

The pressure regulator 14 mainly includes a casing having an inlet port and an outlet port, and a valve that is arranged to be able to slide back and forth within the casing and controls communication between the inlet port and the outlet port. The valve body is comprised of a return spring, etc., which is arranged within the casing to press the valve body against the inlet port so as to normally shut off the inlet port and outlet port.

Of course, in the air pressure control piping 22, the inlet side port of the pressure regulator 14 is connected to the air tank 11 side, and the outlet side port is connected to the suction side of the compressor 12, respectively.

Therefore, when the pressure inside the air tank 11 is higher than a predetermined pressure, the valve body of the pressure regulator 14 is pushed up against the return spring, and the inlet port and outlet port of the pressure regulator 14 are pushed up against the return spring. are connected and their air
The compressed air in the tank 11 is
It is returned to the suction side of 2.

Of course, when compressed air is thus returned to the suction side of the compressor 12, the unloader valve of that compressor 12 is depressed and the suction valve is opened. That is, the compressor 12 is placed in a state where air supply is stopped.

Furthermore, if the pressure inside the air tank 11 is below a predetermined level, the inlet port and outlet port of the pressure regulator 14 are shut off by an operation opposite to the above-mentioned operation, and the compressor 12 is closed. The unloader valve is lifted and
Additionally, the suction valve is closed. That is, the compressor 12 is placed in an air supply state.

Further, an electromagnetic three-way control valve 17 is provided downstream of the pressure regulator 14 in the air pressure control piping 22 described above.

The electromagnetic three-way control valve 17 includes a valve casing having an inlet port, an outlet port, and an exhaust port, and communication between the inlet port and the outlet port, and the outlet port and the exhaust port. It consists of a spool that is arranged to be able to slide back and forth within the valve casing so as to control the spool, and a solenoid coil that is installed in the valve casing to make the spool slide. The inlet port and the outlet port communicate with each other, and when current flows through the solenoid coil, the outlet port and the exhaust port communicate with each other.

Of course, in the air pressure control piping 22, the inlet port of the electromagnetic three-way control valve 17 is connected to the pressure regulator 14 side, and the outlet port is connected to the suction side of the compressor 12. .

The solenoid coil of the electromagnetic three-way control valve 17 is connected to the pressure switch 16 as a brake pedal switch by way of an electric circuit 24.
connected to the electrical contacts of the

Of course, a battery 33 and a diode 34 are inserted into the electric circuit 24.

Therefore, in the above-described brake valve 13, when the brake pedal 15 is depressed, the pressure switch 16 is energized, and the solenoid coil of the electromagnetic three-way control valve 17 is energized, causing the electromagnetic three-way control valve 17 to become energized. The outlet side port of the directional control valve 17 and the exhaust port are connected.

That is, in the air pressure control piping 22,
Compressed air downstream of the electromagnetic three-way control valve 17 is exhausted from the exhaust port, and the compressor 12 is placed in an air supply state.

Furthermore, an exhaust brake device 18 is connected to the above-mentioned air tank 11 via an exhaust brake pipe 23.
is connected.

The exhaust brake device 18 includes a butterfly valve 31 rotatably disposed within the exhaust pipe 32 and a butterfly valve 31 so as to open and close the exhaust pipe 32 of the internal combustion engine mounted on the truck. It is composed of a lever 30 that is rotated from the outside of the exhaust pipe 32, and a pneumatically operated cylinder 27 that rotates the lever 30.

Of course, a piston 28 is arranged in the cylinder 27 so as to be able to slide back and forth, and the tip of the operating rod 29 fixed to the piston 28 is connected to the lever 3.
Pin connected to 0.

The cylinder 27 of the exhaust brake device 18 configured in this manner is connected to the air tank 11 via the exhaust brake pipe 23, and the exhaust brake pipe 23 is provided with a solenoid valve 19.

The solenoid coil of the electromagnetic valve 19 is connected to the above-mentioned electric circuit 24 via the exhaust brake electric circuit 25.

The exhaust brake electric circuit 25 includes a micro switch 26, a battery 33, and a diode 3, which are energized when the accelerator pedal (not shown) of the truck is released.
Of course, 5 is inserted.

The configuration of the air service brake system 10 for an automobile according to the present invention other than those described above is the same as the air service brake system for existing trucks, so a description thereof will be omitted.

Next, the operation of the air service brake system 10 for an automobile according to the present invention will be explained.

First, while the truck is running, press the accelerator.
When the pedal pressure is released, the micro switch 26 is energized and the solenoid valve 19 is opened.

When the solenoid valve 19 is opened, compressed air from the air tank 11 is sent to the cylinder 27 of the exhaust braking device 18 and is routed to the exhaust pipe 32 of the internal combustion engine.
is closed by a butterfly valve 31,
Exhaust brake is activated.

Furthermore, since the solenoid valve 19 and the above-mentioned solenoid three-way control valve 17 are connected in series,
Current also flows through the solenoid coil of the electromagnetic three-way control valve 17.
The inlet side port and the outlet side port are blocked, and the outlet side port and the exhaust port are communicated.

That is, in the pneumatic control piping 22, the compressed air on the downstream side of the electromagnetic three-way control valve 17 is exhausted from the exhaust port, the unloader valve of the compressor 12 is lifted, and the suction valve is closed. Since the compressor 12 is in the air supply state,
The compressed air from the compressor 12 is
The tank 11 is filled.

Therefore, during the operation of the exhaust brake as described above, the power required to drive the compressor 12 is taken away from the internal combustion engine, and together with the exhaust brake, the braking force is increased as an engine brake.

Also, if the brake pedal 15 of the brake valve 13 is depressed while the truck is running, compressed air from the brake valve 13 is supplied to the brake pedal so as to brake the wheels.
is sent to the chamber side, and at the same time the pressure switch 16
is energized.

When the pressure switch 16 is energized, current flows through the solenoid coil of the electromagnetic three-way control valve 17, blocking the inlet port and outlet port of the electromagnetic three-way control valve 17, and
The outlet side port and the exhaust port are connected.

That is, as in the case described above, the compressed air on the downstream side of the electromagnetic three-way control valve 17 in the air pressure control piping 22 is exhausted from the exhaust port, and the unloader valve of the compressor 12 is lifted. Furthermore, since the suction valve is closed, the compressor 12 is placed in the insufflation state, and compressed air from the compressor 12 fills the air tank 11.

Therefore, the brake pedal 15 as described above
During braking of the wheels by stepping on the compressor 12, the power required to drive the compressor 12 is taken away from the internal combustion engine, and the braking force is improved.

In the above-described operation, the drive of the compressor 12, that is, the filling of the air tank 11 with compressed air, is performed when the exhaust brake and the brake pedal 15 are depressed to brake the truck. When running,
In particular, a decrease in the output of the internal combustion engine during acceleration is avoided, and the fuel consumption rate is improved.

Of course, if the truck travels on a highway for a long time without braking and the air pressure in the air tank 11 drops below a predetermined pressure, the existing air service Similar to the brake system, the inlet and outlet ports of the pressure regulator 14 are shut off, the unloader valve of the compressor 12 is lifted, and the suction valve is closed, so that the compressor 12 is free from air delivery. The air tank 11 is then filled with compressed air.

According to the present invention configured as described above, a decrease in the output of the internal combustion engine due to the drive of the compressor is avoided while the vehicle is running, especially during acceleration, thereby improving acceleration performance and reducing the fuel consumption rate. Furthermore, during braking, the braking force as an engine brake is improved, and an air service brake system for a motor vehicle is obtained which provides reliable braking.

[Brief explanation of the drawing]

The figure is a schematic diagram showing a specific example of an air service brake system for an automobile according to the present invention applied to a truck. 10...Automotive air service brake system, 11...Air tank, 12...Compressor, 13...Brake valve, 14...Pressure regulator, 15...Brake pedal, 16...Brake... Pedal switch, 17
... Solenoid type three-way control valve, 20 ... Air pressure supply piping, 21 ... Brake piping, 22 ... Air pressure control piping, 24 ... Electric circuit.

Claims (1)

[Scope of Claims] 1. An air tank, a compressor connected to the air tank via an air pressure supply pipe, and a brake pipe installed in the brake pipe connecting the air tank and the brake chamber side. A pressure regulator installed on the air pressure control piping connecting the air tank and the suction side of the compressor, and a pressure regulator installed on the brake valve side, when the brake pedal of the brake valve is depressed. brake pedal switch energized by the brake pedal switch and its pressure in the pneumatic control line.
An automotive air service brake comprising an electromagnetic three-way control valve located downstream of a regulator, and an electrical circuit connecting the brake pedal switch and the solenoid coil of the electromagnetic three-way control valve. system.