SU1463576A1 - Analog pressure modulator in pneumatic brake drive - Google Patents

Description

The invention relates to a transport engineering, more specifically to brake systems of wheeled vehicles, and can be used in pneumatic anti-lock braking systems.

An analog pressure modulator in a pneumatic brake actuator is known, which contains constant pressure differential inlet and exhaust valves with adjustable actuation points located in a common housing, a split stem on which valve spring stops are located ;, a rod displacement actuator, and an actuator control device, the actuator the movement of the rod is made in the form of a piston placed between two parts of the rod and forming a cavity with the body, one

of which are communicated through the throttle with a pressure source and with a jet regulator.

The disadvantage of this modulator lies in the increased air consumption for controlling the piston position, and also in the case that the electromagnets of the jet regulators are de-energized (when the system fails), the brakes are normally braked. the piston is in the middle position, corresponding to the pressure in the chamber, approximately equal to half of the pressure in the receivers.

The purpose of the invention is to reduce air consumption and provide the possibility of conventional braking when the anti-lock system fails.

The goal is achieved by the fact that in an analog pressure modulator in a pneumatic brake actuator, which contains inlet and outlet valves of a constant differential pressure located in a common housing (adjustable trigger points, a split rod, which supports valve springs, and a rod displacement actuator actuator, and the actuator movement of the rod is made in the form of a piston placed between two parts of the rod and forming a strip with the body, one of which is communicated through the throttle from the a lump of pressure and a jet regulator, the piston is pressed against the side of the exhaust valve by a spring installed in the cavity formed by the piston and body and communicated with the atmosphere.

The drawing shows a diagram of an analog pressure modulator.

The modulator consists of a housing in which an inlet valve 2, an exhaust valve 3, a valve 4 from-: braking and a control piston 5 are placed, which forms a spring 8 with cavity 1 and 5 in cavity 6, and a cavity 7 is connected through throttle: sel 9 and channel 10 with a source of pressure and through the regulator 11 a nozzle - a valve with atmosphere.

I When braking, the air from the brake: krall goes to the brake valve 4 and through the intake valve 2 to the brake chamber and to the exhaust valve 3. In the absence of control voltage on the electromagnet of the 1T regulator, the spring 8 keeps the piston 5 in the extreme right position. At this time, valve 2 is released and valve spring 3 is released. It provides free t

The actual passage of air from the brake valve into the brake chamber through. valve 2 and holding valve 3 in the closed position. In order to control the pressure in the brake chamber, a control voltage is applied to the electromagnet of the regulator 11. This results in a reduction in the flow area in the controller 11, as a result of which the pressure in the cavity 7 increases and the piston 5 is displaced against the force of the spring 8. As the piston 5 moves, the compression of the valve spring 2 increases and the valve springs 3 decrease. This causes the valve 2 to close and the valve 3 to open at a lower pressure in the brake chamber.

With a continuously variable control voltage, the regulator 11 electromagnet also continuously changes the pressure in cavity 7, the position of the piston 5 and the pressure in the brake chamber, i.e. Provides a continuous action analog modulator.

The modulator has only one control cavity, which more than doubles the air consumption for control. When the anti-blocking system fails, the malfunction control circuit of the electronic control unit shuts off the electromagnet of the regulator 11. This ensures pressure relief in the cavity 7 and the displacement of the piston 5 under the action of the spring 8 to the extreme right position. This prevents the modulator from affecting braking process.

The device provides a reduction in air flow and provides the possibility of normal braking when the anti-blocking system leaves the system.

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Claims (1)

ANALOGUE PRESSURE MODULATOR IN A PNEUMATIC BRAKE ACTUATOR containing a constant differential pressure inlet and outlet valve with adjustable pressure points located in a common casing, a split rod on which