Fluid-pressure and analogous brake systems – Load control – Detail
Patent
1993-02-19
1995-04-18
Ballato, Josie A.
Fluid-pressure and analogous brake systems
Load control
Detail
188195, B60T 818, F16J 304
Patent
active
054072565
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is related to a load-sensitive twin brake power controller.
A twin brake power controller of the kind under review is known from the German patent specification No. 3,315,763. For the actuation of the control pistons, this controller is furnished with a rocking element which has an axially symmetrical configuration. The loaded ends of the control pistons, the rocking element and part of a control tappet which is fixed to the load-sensitive movable lever are disposed within a cylindrical chamber which is mill cut into the housing. A dust cover seat is milled around said chamber into the housing edge around which a rolling diaphragm-type dust cover is clamped which defines said cylindrical chamber at the front face. The control tappet leads into this chamber from the outside through a central hole in the dust cover. The dust cover fastens behind a circumferential bead at the control tappet.
The use of rocking elements, irrespective of what their shape may be, has proved useful in the load-sensitive actuation of twin controllers. A flexible dust cover fixed to the housing is indispensable in order that the control piston ends projecting into the chamber, which is free of hydraulic pressure fluid, and their seals are protected against soiling. The housing is cut at low cost from a strand which is extruded with the profile section of the housing. The cylindrical chamber, however, has to be fabricated subsequently by a machining operation just like the seat of the dust cover. As a consequence, substantial material is wasted and a substantial amount of labor is required.
SUMMARY OF THE INVENTION
The present invention has the object of creating a brake power controller of the kind under review in which there is little wasted metal and reduced labor is required for the manufacture of the housing.
Instead of machining, the housing is given its shape directly with the extruded profile section which affords placement of the dust cover so that no finishing operation is needed. Chips do not result during the fabrication of the stepped bores and of the connections for the hydraulic pressure fluid.
In this context, the dust cover itself is, advantageously, cup-shaped so that its volume substitutes the volume of the cylindrical chamber.
Further advantageous features will be revealed by the undermentioned description of a preferred embodiment, making reference to the drawings:
DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a cross-section through the brake power controller of the present invention;
FIG. 2 shows a top view of a dust cover with sheet metal ring.
DETAILED DESCRIPTION OF THE INVENTION
The brake power booster illustrated in FIG. 1 is represented in cross-section through a control unit. A second identical control unit, not being visible, is disposed parallel to the first one and behind it. In the range of the actuating apparatus, the sectional plane is shifted into the axis of symmetry, as is outlined by a dash-dotted line in FIG. 2.
In its housing 1 the brake power controller has a bore 2 within which the stepped piston 5 is axially slidingly guided with the aid of the guide bushing 3 and of the circlip 4. Stepped piston 5 is sealed off with respect to the wall of the bore 2 and of the guide bushing 3 by the sealing sleeve 6 and 7, respectively. It is provided with an axial bore 8 within which the valve closing member 9 is positioned which jointly with the valve seat 10 acts as a control valve between the inlet chamber 11 and the outlet chamber 12. The valve closing member 9 is for this purpose stressed in the closing direction by the compression spring 13 and in the illustrated pressureless condition lifted off from its valve seat 10 by the tappet 14 which takes support at the front wall 15 defining the housing bore 2.
The end 16 of the stepped piston 5 which faces away from said front wall 15 projects out of the housing bore 2 into the chamber which is free of hydraulic pressure fluid. Jointly with the end not shown in the drawing of the second stepped piston it is
REFERENCES:
patent: 3904253 (1975-09-01), Riquart
patent: 4219242 (1980-08-01), Carre
patent: 4332423 (1982-06-01), Schopper et al.
Cezanne Rudolf
Fueller Dieter
Saalbach Kurt
Alfred Teves GmbH
Ballato Josie A.
Lewis J. Gordon
Seitter Robert P.
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