JPS59167355A - Two circuit type brake gear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a two-circuit braking device for a motor vehicle, which includes one two-circuit brake valve and a working medium supplied from the two-circuit brake valve through two brake circuits. a wheel brake cylinder with a main valve and a pressure control valve for the anti-skid system consisting essentially of a wheel sensor, an electronic switching device and a pre-control solenoid valve. related to things. A braking device of this type is known (DE-A-2625502).

In this known braking device, the brake valve (
(per shaft) A pressure control valve is used that can be controlled in a single circuit type. (If a single-circuit pressure control valve such as 2 is used in a braking system that acts on one shaft or wheel in a two-circuit manner, the cost for the anti-skid system will almost double.

(3) For example, two pressure control valves are used for both brake circuit reservoirs of one wheel, both pressure control valves being controlled in parallel by an electronic switching device. In addition to the doubling of the valve costs, the electronic switching device must also be specially designed, and in addition to the parallel control of the pressure control valves, the function monitoring of the pressure control valves must also take place in parallel.

In contrast, the two-circuit pressure control valve according to the invention has the advantage of significant cost savings. Furthermore, there is no need to use special electronic switching devices, and the usual standard electronics can be used in single-circuit pressure control valves.

Next, embodiments of the present invention will be specifically described using the drawings.

The pressure control valve 1 has a housing 2 , which is constructed symmetrically on both sides of a central axis 3 . On both sides of the intermediate plate 4 there are respectively identical casing parts 5, 6, which casing parts (4) each carry one three-port two-position valve 7 or 8 and in each case two two-point valves. 2 position valve 9゜11 or 1
It is equipped with 0.12. 3-point 2-position valves 7, 8 and 2
7f'-t2 position valves 9~]2 constitute main valves; these valves have a valve seat fixed to the casing and an elastic member as a closing body, the closing body being a control Diaphragm part ] 3 , 14 , ] , ] 5 , 16 ,
] 7, 1.8.

Due to the symmetrical arrangement of the housing parts 5, 6, the diaphragms 13 and 1.4, 15 and 16 and 17 and 18 are located opposite each other and thus form a common volume chamber 19, 20.21, respectively. . The diaphragm 15 or 16 is a push rod/intermediate piece 15' or 16
′ is a double member.

The intermediate plate 4 has a control diaphragm on one side]
, 3, l 4, 15, ], ]6, ],
7, 18 for centering. This center positioning is performed by a two-circuit operation brake valve 24 (5
) is important for flawless control of the generated braking pressure. On the other hand, the intermediate plate 4 serves to guide the control pressure produced by the front control valve 25 shown in FIG. Three front control valves 25, namely, each main valve set 7/8°, 9/10, ], 1/12, respectively]
Two pre-control valves are arranged in the casing 2 of the pressure control valve 1 . Each of the two outlets 26, 27 or 28, 29 of the pressure control valve 1 connects to the brake conduit 30, 31 or 3.
2.33 to wheel brake cylinders 3/1.35 or 36.37, which are respectively arranged in pairs on each wheel 38 or 39. However, the wheel brake cylinders can each be designed as a component consisting of a double piston cylinder.

Conduits 40 and 41 led from the two-circuit brake valve 24 are connected to the front control valve 25, and a two-way control valve 42 is provided therein. (6) Pressure is selected. As is clear from FIG. 2, both three-point and two-position valves 7 and 8 monitor an outside air passage 43 or 44, respectively, which is connected to outside air via a load relief valve 45. . Each main valve group 7/8, 9/1
．． 0 and 1]/12, only one precontrol valve 25 is provided in each case. The front control valve 25 is a mover 46
The mover holds the closing pieces 47 and 48 of the two valve seats 49 and 50, and uses the electromagnetic force generated by the coil 5J to close the spring 52 between the valve seats 49 and 50. It is possible to reciprocate against the resistance.

The illustrated two-circuit brake system operates as follows; during braking, both conduits 40 and 41 are supplied with brake air from the two-circuit brake valve 24.

Brake air is transferred to the brake conduits 30.3], 32.33 via the open main valves (3-port 2-position valves 7, 8. 2-port 2-position valves 9, ], O,] 1., ] 2). Reach within. As a result, braking is effected also in two-circuit fashion using two wheel brake cylinders 34.35 and 36.37 for each wheel 38 and 39, respectively.

Wheel sensors respond when rocking is imminent.

The electronic device first controls the coil 51 of the central front control valve 25.
Current is supplied to the switch, so that the front control valve is switched to the other end position.

In each case, the higher pressure reaches the intermediate plate 4 via the two-way control valve 42;
Push the diaphragm 15°16 with 16'e into the other end position. Therefore, the three-point and two-position valves 7 and 8 are not closed. This valve blocks the inflow of braking air. Two further pre-control valves 25 and four two-point two-position valves 9,10
1], 12'(f) is used to maintain the pressure and release it in conjunction with the clock-controlled valve or the id-3 two-position valves 7 and 8.

As is clear, the braking pressure is not applied entirely in a two-circuit manner and is also monitored in a two-circuit manner during lock prevention, but the pre-control pressure in a single circuit based on a common volume chamber 19,20°21 is only necessary. One 3/2-way valve 7 or 8 in each case and two 2-way/2-way valves 9 in each case
and 11 or 10 and 12, a two-circuit pressure modulation is also possible, ie for each wheel 3
8 or 39 has its own adjustment device.

Therefore, the important condition for an economical and coherent construction of multifunctional valves is fulfilled.

Furthermore, the braking capacity of two-circuit type wheel brakes is not different from that of single-circuit type wheel brakes.
Since the volume of the two brake cylinders is approximately the same as that of a single cylinder with one circuit, the valve cross section of the two-circuit pressure control valve can also be constructed correspondingly smaller than with the one-circuit valve. The condition for a conjoint configuration is also satisfied by .

However, a braking system of the type mentioned at the outset (with two-circuit wheel brakes) can be integrated into mass-produced standard electronic equipment configured for single-circuit wheel brakes. Significant advantages result from a single-circuit precontrol valve 25.

Only in this way is it possible to realize an inexpensive building system in which the same components or units can always be used in a wide variety of practical vehicles.

Of course, the safety and reliability of the assembled components or units is also extremely high.

Safety and reliability for the two-circuit pressure control valve 1 according to the invention are unavoidable due to the use of mass-produced individual parts and the differential centering of the switching element by means of an intermediate plate 4. The difference lies in the fact that it does not have a negative effect.

In the event of a brake circuit failure, complete circuit regulation is maintained. A simple two-way control valve 42, configured as a springless ball valve and mounted in the precontrol circuit as shown, allows the precontrol pressure to be removed from the complete brake circuit and at the same time No pressure loss to the circuit occurs.

(10) The similarly symmetrical design shown in FIG.
It is shown that it can be constructed with only two outlets 62 and 63 for one wheel 61. However, the pressure control valve 60 is configured in a two-circuit type. 2°
The selection of the precontrol pressures supplied by the two precontrol valves 64 and 65 is in the same manner as in the embodiment of FIG.
6.

Two pressure control valves 6 for two wheels on one axle
0 is required. The valve cost per axle is therefore correspondingly higher than in the embodiments of FIGS. 1 and 2.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a sectional view of the first embodiment, FIG. 2 is a sectional view of the two-circuit front control valve of the first embodiment, and FIG. FIG. 2 is a cross-sectional view of the second embodiment. DESCRIPTION OF SYMBOLS 1...Pressure control valve, 2...Casing, 3...Center axis, 4...Intermediate plate, 5 and 6...Casing part, 7 and 8...3-bottom 2-position valve ,9,10
゜]1 and]2...2-bottom 2-position valve, 13, ]
, 4. . ], 5, ], 6, 1.7 and 18...Diaphragm, 15' and 16...Push rod/intermediate piece, 1.9
．． 20 and 21... Volume chamber, 24... 2-circuit operation braking valve, 25... Front control valve, 26, 27. 28 and 29... Outlet, 30. 31. 32 and 33. Brake. Conduit, 34° 35. 36 and 37...Wheel brake cylinder, 38 and 39...Wheel, 40 and 41...
Conduit, 42... Two-way control valve, 43 and 44... Outside air passage, 45... Load reduction valve, 46... Mover, 47 and 48... Closing piece, 49 and 50... Valve seat, 51...
- Coil, 52... Spring, 61... Wheel, 62 and 63... Outlet, 64 and 65... Front control valve, 66.
・・Two-way control valve FIG, 2 FIG, 3

Claims (1)

[Scope of Claims] 1. A two-circuit braking device for an automobile, including one two-circuit brake valve and a wheel brake to which a working medium is supplied from the two-circuit brake valve through two brake circuits. a cylinder and a pressure control valve, the pressure control valve having a main valve and approximately a wheel sensor;
A two-circuit type, which is a part of an anti-skid device consisting of an electronic switching device and a pre-control/electromagnetic valve, characterized in that the pressure control valve (1, 60) is configured in two circuits. Braking device. 2. The two-circuit braking device according to claim 1, wherein the 22-circuit pressure control valve (1, 60) can be controlled in one circuit. 3. Two circuits according to claim 1 or 2, wherein the control chambers of the main valve reservoir in the pressure control valve (1) each form a common volume chamber (19, 20, 2). type braking device. 4 The pressure used for pre-control is controlled by a two-way control valve (4
6, 66), and the two-way control valve is capable of supplying working medium from both brake circuits (], , IT). A two-circuit braking device according to one item. 5 The pressure control valve (], , 60) has a central plane and has a symmetrical structure, and the intermediate play 4 () is located on the central plane.
4,) is arranged, and the front control valve (
25) A two-circuit braking device according to any one of claims 1 to 4, wherein a passage is provided for guiding the pressure supplied from the 25). 6. Claims 1 to 6, wherein the pressure control valve (1) is formed into two circuits to generate two different pressures.
The two-circuit braking device according to any one of clauses 5 to 6. 7. The two-circuit braking device according to any one of claims 1 to 5, wherein the pressure control valve (60) is formed in one circuit.