DE2940060A1 - MULTI-CIRCUIT PROTECTION VALVE - Google Patents

Description

η 5 77 4

September 27, 1979 He / Wl

ROBERT BOSCH GMBH, 7OOO Stuttgart

Multi-circuit protection valve

State of the art

The invention is based on a multi-circuit protection valve according to the preamble of the main claim. Such a multi-circuit protection valve is known (DE-OS 2k 23 520).

In such protective valves, on the one hand, the production of the housing channels and bores is difficult because they almost all of them have to be produced in special operations or special clamping of the housing. on the other hand If one service brake circuit fails, the other circuits can fill up all circuits equally can only be secured with non-return valves, whereby a special non-return valve is then necessary for each circuit is.

Advantages of the invention

The multi-circuit protection valve with the characterizing features of the main claim has the advantage that the circles of equal rank are grouped together

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that are secured against each other. The central check valve prevents the failure of a service brake circuit a pressure drop in the secondary consumer circuits. To protect several auxiliary consumers from the service brake circuits only a single check valve is required.

drawing

An embodiment of the invention is shown in the drawing and in more detail in the following description explained. The figures show: FIG. 1 a diagram of a four-circuit protection valve and FIG. 2 a section through a housing a four-circuit protection valve.

Description of the embodiment

A four-circuit protection valve 1 has a schematic structure in the form of four equally supplied overflow valves 2, 3 ^ and 5j, all of which can be reached from an inlet connection 6 from a central through-hole 7. Downstream of the overflow valves 2, 3 _} ^ and 5 are four brake circuits I, II, III and IV, of which brake circuits I and II are service brake circuits and brake circuits III and IV are brake circuits for secondary consumers.

In the central through hole 7 is behind a junction 15 for the two operating circuits I and II assigned Overflow valves 2 and 3, a check valve 8 is arranged. The check valve 8 is located in front of a junction Ic for the two secondary consumers III and IV. With this check valve 8, the two secondary consumers are

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III and IV secured by the service brake circuits I and II, so that if a service brake circuit I or II the secondary consumers III and IV are not affected; a pressure drop in the secondary consumer circuits III and IV then do not take place. It is important that both secondary consumers III, IV with only a single, common check valve 8 are to be secured.

FIG. 2 shows a section through a housing 9 of a four-circuit protection valve. There are the input connection 6, the central through hole 7 and the check valve 8 can be seen. Four of the overflow valves, not shown here 2, 3, ^ and 5 downstream housing outputs have the reference numbers 10, 11, 12 and 13

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Claims (3)

R. 57 74 September 27, 1979 He / Wl ROBERT 30SCH GMBH, 7OOO Stuttgart 1 Expectations 1 j multi-circuit protection valve for motor vehicle brake systems, / η the housing of which an overflow valve is arranged for each circuit is, characterized in that the multi-circuit protection valve with a central through hole (7) is provided and that a check valve (8) is arranged in this through hole (7), through which a part (III, IV) the brake circuit (I, II, III, IV) is secured against the other part (I, II). 2. Multi-circuit protection valve according to claim 1 for protection at least one secondary consumer from two operational heating circuits, characterized in that the check valve (8) behind a branch (15) for the two Service brake circuits (I, II) associated overflow valves (2, 3) is provided. 3. Multi-circuit protection valve according to claim 1 or 2 designed as a four-circuit protection valve, characterized in that the check valve (8) is provided in front of a branch (16) for two secondary consumers (III, IV). 13001 6/0336