Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1994-12-22
1996-05-21
Mitchell, David M.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
3031135, B06T 826, B06T 1134
Patent
active
055183034
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a twin-type brake force regulator of the type having two bores arranged in parallel in a housing. The bores each contain a slidable control piston. The brake force regulator also has an actuating device, including a control tappet, and a beam of balance. Twin-type regulators including a control tappet and a beam of balance are advantageous because all elements required for the actuation are positioned in the space which is free from pressure fluid. Therefore, the elements do not require additional sealing. However, this advantage can only be utilized in an electromagnetic locking device, if a number of difficulties are overcome. If the electromagnetic locking device is to be positioned in the space which is free from pressure fluid, it is not possible to have the locking device act directly on the valve closure member, as is disclosed in DE 40 29 332 A1, for example, in order to minimize the electromagnetic controlling forces. Rather, it is required in twin-type regulators actuated by a beam of balance to prevent the control pistons from performing the stroke necessary for the control operation. However, controlling forces of a like magnitude can only be generated by a particularly potent and, hence, very expensive magnet.
DE 40 30 686 A1 discloses a locking device, wherein, due to a special ramp arrangement, the electromagnet displaces a number of locking balls in the radial direction which block the stroke of the control tappet in the direction of the magnet. The result is that the control pistons are arrested and axial forces are not applied to the electromagnet, thereby preventing a control operation. However, disadvantageously, the arrangement necessitates major assembly efforts because a comparatively large number of elements, which are movable in relation to each other, have to be fitted into each other.
An object of the present invention is to equip a generic twin-type brake force regulator with an electromagnetic locking device, for which only a small number of functional elements are required. The electromagnetic locking device preferably is subjected to minor axial forces, thereby permitting low-cost manufacture of the arrangement.
Thus, the principle of the present invention is to arrange the electromagnetic locking device, which includes an electric coil, a magnet armature and a locking member attached to the magnet armature in a radial direction relative to the axes of the control pistons, and to bring the locking member into engagement with the control tappet. On the one hand, it is advantageous that the stroke forces of the control pistons act perpendicularly on the magnetic actuating forces. On the other hand, a Joint locking mechanism for both control pistons is achieved by the engagement of the locking member with the control tappet. Because only one locking member is necessary which, in addition, is rigidly coupled to the magnet armature, the assembly effort is minimized.
A detailed description of the inventive idea is given by describing one preferred embodiment with reference to three accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-sectional view of a twin-type brake force regulator according to the present invention.
FIG. 2 is a partial cross-sectional view of the regulator in FIG. 1.
FIG. 3 is a partial cross-sectional view of the regulator in FIG. 1 in another sectional plane.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The twin-type brake force regulator, shown in FIG. 1, has in the housing 1 two stepped bores, only one of which, stepped bore 2, can be seen, while the second stepped bore is positioned congruently behind stepped bore 2. A control piston 3 is guided in the stepped bore 2 and forms a seal between stepped bore 2 and space 4, which is free from pressure fluid and subjected to atmospheric pressure. Control piston 3 accommodates control valve 5 which closes as soon as the control piston displaces a sufficient distance upwards (according to the drawing). Control valve 5 governs the connection between
REFERENCES:
patent: 4765690 (1988-08-01), Rudiger et al.
patent: 5251969 (1993-10-01), Cezanne et al.
ITT Automotive Europe GmbH
Mitchell David M.
Schwartz Chris
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