DE2019121A1 - Hydrostatic braking system - Google Patents

Description

Hydrostatic Brake System The invention relates to a hydrostatic. Brake system, especially for motor vehicles, implemented in the movement turns into hydraulic energy and heat.

Hydrostatic machines are usually used to drive mechanical in to convert hydraulic energy (pump) or hydraulic energy into mechanical energy implement (hydraulic motor).

Systems are known in which the rotor shaft acts as a pump hydrostatic machine is connected to the drive shaft of the vehicle. Leaves If you do the pump work, it exerts a braking torque on the drive shaft of the vehicle. When driving normally straight ahead, the pump runs in idle or is separated from the drive shaft by a coupling. The applied braking torque is then dependent on the controllable flow rate, which in turn is controlled by the brake lever can be adjusted.

In all systems of this type, the entire kinetic energy is used Braking process converted into a form of energy that is worthless for further use.

The object of the invention is to provide a. Brake system of the ei @@@ @@ mentioned Art to create in which at least part of the @ e @ @@ - kinetic energy of the @ to be braked Stored in the vehicle and / or used to operate auxiliary units can.

According to the invention, this is achieved in that a conveyor connection the controllable, hydrostatic machine @ tromteile @ valves and subsequent pressure relief valves are connected @, one via a flow divider valve and pressure relief valve Feed certain pressure medium flow, which has been pumped out, to various consumers.

The delivery connection of the hydrostatic machine is on the inflow connected to a first current distribution valve, one of which was constantly limited Discharge flow through a pressure reducing valve cun; Container leads, during the second with the flow rate variable discharge flow at the inflow of a second flow component @ ve @@ ils is whose constant limited discharge flow on the one hand to a pressure reducing valve and on the other hand is due to a consumption, while the variable discharge flow is a further consumption is supplied.

The invention can be embodied in various ways, one of which is illustrated in FIG of the attached drawings are explained in more detail below.

Pig. 1 shows a diagram of the hydrostatic brake system according to the invention.

Fig. 2 shows a functional representation of the flow divider valves.

The dashed line 1 in FIG. 1 shows a hydrostatic one Brake. Your shaft 2 is connected to the drive shaft of the vehicle. The interior the @@@@@ ostatic machine acting as a pump is filled with pressure medium, the above @@@ Pressure medium line 3 and the inflow 4 reached the outflow 5.

Is the point when the brake system is actuated by a control device 8 brought from idle to conveying position, then part of the mechanical Energy converted into hydraulic pressure, while another part is converted into heat will.

The pressure medium emerging from the pump is fed to a flow sharing valve 14 supplied. This flow divider valve 14 limits an outflow flow at 15 by throttling to a constant value, while the rest of the pressure medium flow the second drain 16 is fed. At the limited outlet 15 is the flow divider valve 14, a pressure relief valve 17 is connected downstream, the outlet of which into the container 7 leads. The excess flow is applied via the outlet 16 of the flow divider valve 14 the downstream consumer. In the circuit according to the invention is to the Outflow 16 of the inlet of a second flow divider valve 18 is connected. The drain 19, which in turn carries a constantly limited current, is on the one hand connected to a pressure relief valve 21 connected, the excess pressure medium discharges into the container 7. on the other hand is the outlet 19 of the flow divider valve 18 via a check valve 22 with a Hydraulic accumulator 23 connected. The pressure medium flow at the outlet 19 charges the hydraulic accumulator 23, the stored energy of which can be supplied to a consumer as required can.

The residual flow of the flow divider valve 18 is applied across its width Drain 20 a connected consumer 24 z. B. a small hydraulic motor; a pressure relief valve 25 protects the consumer 24 from overload.

The inventive arrangement of the flow divider valves and pressure relief valves ensures a constant braking torque of the hydrostatic machine because it prevent z. B. if inl case eie actuation of the brake system via the control device 8 the hydraulic accumulator 23 should be almost empty, the whole by the pump Acting hydrostatic machine promoted @ Pressure medium first charges the accumulator, before a @ remswirkun @ comes about. The facility allows that about one A certain amount of additional pressure medium to be supplied to smaller consumers and usable to revenge.

Claims (2)

Claims 1. Hydrostatic braking system, especially for motor vehicles, in the kinetic energy is converted into hydraulic energy and heat, whereby the Rotor shaft of a controllable hydrostatic machine acting as a pump with the Drive shaft of the vehicle is connected, thereby g e k e n n -z e i c h n e t that to the delivery connection (9) of the hydrostatic machine (1) flow divider valves (14, 18) and subsequent pressure relief valves (17, 21) are connected, the an amount determined by flow divider valves and pressure relief valves Feed the discharged pressure medium flow to various consumers (23, -24). 2. Hydrostatic brake system according to claim 1, characterized g e -k e n n z e i c h n e t that the delivery connection (5) of a controllable hydrostatic machine (1) is connected to the inflow of a first tronteilerventils (14), whose a constant limited discharge flow (15 via a pressure relief valve (17) to Container (7) leads, while the second discharge flow variable with the braking torque (16) is at the inflow of a second flow divider valve (18), whose constant limited Outflow stream (19) on the one hand at a pressure relief valve (21) and on the other hand on one consumer (23), while the variable discharge flow (20) to a second Consumer (24) is supplied.