摘要:
The brake system includes a brake pressure generator with a master cylinder connected to wheel brake cylinders through master brake conduits; auxiliary pressure pumps having pump outlets in communication with the master brake conduits and pump inputs in communication with a pressure fluid reservoir through inlet conduits; wheel sensors and electronic circuits for determining the wheel rotating pattern and for generating electrical brake pressure control signals capable of controlling pressure fluid inlet and outlet valves disposed in the conduit system for slip control. The traction slip control system insures, with little effort involved, assembling and disassembling capabilities, and, in disassembled condition, complying with the control principle for a driven front axle and, in assembled condition, complying with the traction slip control mode for a driven rear axle in all speed ranges. The present invention provides an accumulator with a single connection in communication, with the master brake conduit, with an electromagnetic valve having a pressure monitoring switch coupled thereto and provided with a bypass enclosing a release valve located between the connection and the accumulator.
摘要:
To insure that no air bubbles are included in a pump of an anti-locking system, the pump is placed into the master brake conduit, thereby causing it to be scavenged by manual brake operation. Once a brake pressure of about 5 bar is attained, a switch-over valve (28) is switched-over, causing the master brake conduit in the pressure build-up direction to be blocked. Additionally pressure fluid is supplied to the secondary conduit (26) and a pressure opening valve (27). The pressure decrease is effected through the direct conduit (13). In the event of a brake slip control, the pump takes in pressure fluid from the reservoir (25) through the suction valve (22).
摘要:
A slip-controlled brake system is disclosed having a hydraulic power booster and a master cylinder arranged downstream of the power booster, wherein the pressure chamber of the power booster can be acted upon by an external pressure depending on the position of a pedal-actuatable brake valve, and wherein a fast-fill cylinder is provided which can be acted upon by the dynamic pressure and through which additional pressure fluid can be supplied to the brake circuits of the master cylinder. The fast-fill cylinder is equipped with a three-step bore wherein a piston with three shoulders is longitudinally displaceably arranged. A chamber in front of the large drive surface of the piston is connected to the dynamic brake circuit through a pressure fluid line and a chamber in front of an end face of the small step is connected to a static brake circuit through a second pressure fluid line. A first annular chamber formed between the large shoulder of the piston and the medium-sized step of the stepped bore than communicates with a second annular chamber formed between the medium-sized shoulder of the piston and the small step of the stepped bore through a pressure fluid channel and a valve. The second annular chamber is connected to a return line. In the event of a brake pressure control, additional pressure fluid flows from the chamber in front of the small step of the piston of the fast-fill cylinder into the brake circuit through the pressure fluid line. In this case, the fast-fill cylinder operates independently of the functioning of the anti-lock system.
摘要:
A hydraulic brake system with slip control for automotive vehicles comprising a master cylinder (2) pressurizable by a hydraulic power booster (1), in which system valve(s) (31,27,32,28,33,23) are inserted between the master cylinder (2) and the wheel brakes (29,30,24,25) connected to the master cylinder (2) which allow pressure fluid removal from the wheel brakes (29,30,24,25) that can be replenished out of the pressure chamber (19) of the hydraulic power booster (1) by way of a change-over valve (36). A stroke limitation of the brake pedal (8) is effected during slip control. The end surface of the master cylinder piston (5) close to the working chamber (16) being larger than the is effective surface of the booster piston (4), and wherein a stepped piston is employed as master cylinder piston (5) with an annular surface (18) thereof being adapted to be acted upon in the actuating direction by the pressure prevailing in the working chamber (16). A non-return valve (37, 38) is connected to the change-over valve (36) normally assuming its closed position through which the wheel brakes (29,30,24,25) can reacted upon directly by the pressure prevailing in the pressure chamber (10) of the hydraulic power booster (1).
摘要:
There is presented a method for assembling a tandem master cylinder and a vacuum brake power booster of a hydraulic brake system for automotive vehicles. Air is injected via the pressure connections (19, 36) of the pressure chambers (11, 18) associated with the pistons (2, 3). Simultaneously, the pistons (2, 3) are moved in the direction away from the brake pedal. The pressure increase in the pressure chamber (18) is measured during the movement of the pistons (2, 3) and thus during the movement of the central valve (14) accommodated in the floating piston (3). The air pressure in chamber (18) will rise as soon as the closing member (15) of the central valve (14) has moved to sit on the valve seat (16) and the central valve is closed thereby. A trigger point which determines a measured distance on the abscissa of the diagram is fixed in the curve of the diagram "Pressures as a function of the travel of the central valve", the said curve indicating the pressure increase. This measured distance dictates the number and/or dimensioning of spacing washers (8) which are to be arranged between the pressure element (9) and the push rod piston (2) in order to accomplish a reduction of the lost travel of the central valve (14). The present invention serves to accomplish an elegant method in conformity with the demands of automation for assembling a tandem master cylinder and a vacuum brake power booster, as well as a simultaneous reduction of the lost travel of the second central valve (14).
摘要:
A pressure supply system for the generation of the auxiliary pressure of a hydraulic brake system for motor vehicles comprises an accumulator, a hydraulic pump driven by electromotive force and a pressure switch (1) controlling the turning on and off of the hydraulic pump. The pressure switch (1) includes a switch piston (2) having a piston rod (5) mechanically actuating in a pressure-responsive manner, successively, two or three switches (8,9,10). The pump motor (26), by way of these switches, and by way of a relay, is turned on when a bottom pressure limit value (P.sub.U) is reached, and turned off when the upper pressure limit value (P.sub.O) is reached and exceeded. A holding circuit is connected in the electric circuit, in which are provided the switches (8,9,10) of the pressure switch (1), which holding circuit ensures an abrupt switch-over of the relay into the other switching position when a slow approach of a pressure (p) to the pressure limit values (p.sub.U, P.sub.O) causes fluttering of the relay contacts.
摘要:
The present invention relates to a traction slip control device comprising a sensor which responds to a beginning slip condition on at least one of the driving wheels and, connected to the sensor, a control circuit which via an auxiliary drive in the form of a fluid which actuates the throttle valve of the drive engine in the closing sense when the sensor detects a slip condition and feeds a slip signal to the control circuit.
摘要:
The present invention relates to a space-saving and weight-saving motor-and-pump assembly which comprises a drive motor and a pump unit driven by the shaft of the said motor. In order to supply in parallel as many media as possible with an assembly of this type, the present invention suggests the additional integration of at least one second pump unit, driven by the motor shaft of the drive motor, into the motor-and-pump assembly.
摘要:
In a piston pump, in particular, for the pressure fluid conveyance in hydraulic, slip-controlled brake systems, comprising at least one piston, a suction valve and a pressure valve, it will be possible for the suction and pressure valves to be externally checked in that the suction valve and the pressure valve are formed on a structural unit adapted to be separately handled. Preferably, the structural unit comprises a sleeve-type section in which the piston is guided.
摘要:
A hydraulic brake system which incorporates several mutually independent brake circuits and does not require additional energy for conducting brake-slip control actions or stability control actions.