FR2777249A1 - Vehicle brake or clutch fluid circuit purge - Google Patents

Abstract

The vehicle brake for clutch hydraulic circuit purge has a reversible suction pump (1) driven by an electric motor (2) and connected by purge valves to the hydraulic circuit to extract fluid from the circuit while replacement fluid is injected into the fluid reservoir. The purger has two liquid reservoirs controlled by a reversing valve (5).

Description

The subject of the present invention is a suction or steam trap

  brake or clutch hydraulic system pressure. It concerns the industrial and commercial field of the manufacture and distribution of tools intended above all for the equipment of workshops called to ensure the maintenance and upkeep of road vehicles. It can be suitable for all types of cars or trucks with a system of

  hydraulic braking or clutch.

  Apart from heavy goods vehicles, the braking systems of road vehicles are today almost always of the hydraulic type. They consist essentially of a master cylinder supplied with special liquid by a reservoir and whose piston moves by action on the brake pedal. The master cylinder is connected by conduits to each receiver which can be the caliper of a disc brake or the cylinder of a drum brake. Each receiver, as well as certain complementary members such as brake booster, has a valve with bleed screw allowing air to escape from the fluid circuits during filling, or the flow of used liquid when replacing the

special liquid.

  In addition, an increasing number of vehicles have a hydraulic clutch whose circuit is

similar to that of the brakes.

  The braking or clutch circuits of vehicles require periodic replacement of the fluid ensuring the transmission of energy. This operation is currently carried out by means of devices, the most common of which operate by pressure to allow the transfer of the liquid in the circuit, these devices being generally connected to the reservoir supplying this circuit, the bleed screws located at the level of the receivers (bracket or wheel cylinder) being

  open to allow the draining of the used liquid.

  The disadvantage of this type of device is that it requires a specific connection plug for each model.

  hydraulic fluid tank.

  In addition, pressure-operated devices can only replace liquid with one type of liquid. To change the liquid, you must empty the device and fill it with another type

liquid.

  Other devices operate by suction and are connected directly to the screws.

purge of circuits.

  The choice of the method used is generally dictated by the configuration of the braking or clutch circuits and maintenance workshops are most often required to acquire at least two different devices in order to be able to deal with all the cases that may

to present oneself.

  The device according to the present invention aims to remedy these drawbacks. The device which is the subject of the request is in fact a device operating according to the two principles, that is to say that it uses pressure when a universal plug or an adaptable plug forming part of the equipment can be used on the tank of the hydraulic system of the vehicle, the suction purge being implemented in all other cases, which will make it possible to have a single device covering all of the different use cases. The device also makes it possible to choose between two types of liquid before the operation, by simple operation of a three-way tap, without having

to empty from tank.

  It consists of a device equipped with a suction and discharge pump which can be connected either to the purge valves to suck the used liquid and evacuate it (suction purge mode), or to the reservoir of the hydraulic circuit to inject the liquid of replacement (purge by pressure mode), this liquid coming from one or the other of two integrated tanks selected by means of a reversing tap, the mode of use being determined by acting on the direction of

  rotation of the motor driving the pump.

  In the accompanying drawing, given by way of nonlimiting example of one of the embodiments of the subject of the invention, FIG. 1 represents a diagram

  block diagram of the hydraulic circuit trap.

  The device consists of a preferably mobile or portable assembly comprising a suction and discharge pump 1 driven by an electric motor 2 with two directions of rotation and connected on one side to two tanks 3, 4 incorporated by means of a reversing tap 5 for selecting one of these reservoirs, and on the other side to an external pipe fitting 6 to which a pipe 7 is fitted, which is fitted to connect to the brake fluid reservoir of the vehicle for bleeding under pressure, or with a nozzle fitting onto the bleed valves

  for use in suction mode.

  The pump 1 is of the reversible type comprising two inlet-outlet which can each suction or discharge, depending on the direction of rotation of the drive motor 2. The inlet-outlet connected to the tanks 3, 4 comprises an outlet valve 8 making it possible to put it in communication either with the tanks, or with an evacuation connector 9 to which a tube 10 is connected. In suction mode, this valve allows the used liquid contained in the vehicle circuit to be sucked up by the pump and discharged into a recovery tank (not shown). Between the pump 1 and the external pipe fitting 6 is disposed a pressure regulator 11 controlling the outlet of the liquid in pressure purge mode. The reservoirs 3, 4 each have at their outlet a non-return valve 12 preventing the accidental penetration of used liquid, during use in suction mode. They are also equipped with detectors connected to level 13 indicators allowing

  know the quantity of liquid remaining at any time.

  The assembly is completed by an electrical supply cable 14 and a control box 15 allowing the engine 2 to be started and stopped, as well as the choice of its direction of rotation determining the pressure or suction mode. This box will preferably be connected to the device by a flexible cable 16 so as to

  ability to control it remotely.

  The positioning of the various constituent elements gives the object of the invention a maximum

  useful effects which had not, to date, been obtained by similar devices.

Claims (5)

  1. Air or pressure bleeder for the hydraulic brake or clutch system, intended for the equipment of road vehicle maintenance workshops and suitable for all types of cars or trucks with a braking or clutch system hydraulic, characterized in that it consists of an assembly comprising a suction and delivery pump (1) driven by an electric motor (2) and which can be connected either to the bleed valves of the hydraulic circuit to suck the used liquid and the '' evacuate (suction purge mode), either to the reservoir of the hydraulic circuit to inject the replacement liquid (pressure purge mode), this liquid coming from one or the other of two incorporated reservoirs (3, 4) selected in the by means of a reversing valve (5), said pump being of the reversible type comprising two inlet-outlet which can each suck or discharge, depending on the direction of rotation of the motor (2), one of them and ant connected to the diverter valve (5), the other to a pipe fitting exterior (6).   2. Steam trap according to claim 1, characterized in that a pressure regulator (11) controlling the outlet of the liquid in pressure purge mode is interposed between the pump (1) and the fitting of external pipe (6).   3. Steam trap according to any one of   previous claims, characterized in that   that the inlet-outlet connected to the tanks (3, 4) comprises an outlet valve (8) making it possible to put it in communication either with said tanks, or with an evacuation connector (9) used in suction mode to discharge into a container for collecting the used liquid contained in the vehicle circuit and sucked up by the pump (1). 4. Steam trap according to claim 1, characterized in that the tanks (3, 4) each have at their outlet a non-return valve (12) preventing accidental penetration of used liquid, when using the device in suction mode . . Steam trap according to claim 1, characterized in that the tanks (3, 4) are equipped with detectors connected to level indicators (13) so as to be able to know at any time the amount of liquid remaining.   6. Steam trap according to claim 1, characterized in that it is connected by a flexible cable (16) to a control box (15) allowing its remote control, said control box controlling the starting and stopping motor (2), as well as the choice of its direction of rotation determining the purge mode   by pressure or purge by suction.   7. Steam trap according to any one of   previous claims, characterized in that   whether it constitutes a mobile or portable assembly.