Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Patent
1993-03-08
1994-08-23
Look, Edward K.
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
74571M, 74836, F04B 106, G05G 100, F16H 3508
Patent
active
053402855
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention broadly relates to a drive assembly. In particular, the present invention relates to a motor pump assembly for slip-controlled brake systems, that includes a device for transforming rotary movements into translatory movements.
Drive assemblies comprising a device for transforming rotatory motions into translatory motions, for instance oscillating motions, find a wide variety of fields of application in general mechanical engineering. In particular, in industrial hydraulics, motor vehicle hydraulics and in process engineering, drive systems of such drive assemblies are widely used. The kinematics of the assemblies are durably controllable with high precision even under very different conditions of use.
An example of a motor pump assembly is found in the German patent application having the official filing number P 40 278 48.4, which discloses a pump assembly, actuated by means of an electric drive assembly that supplies pressure fluid to a slip-controlled motor vehicle brake system. The drive shaft of the electric motor has, at the shaft end, an eccentric pin. Two pump pistons of a radial piston pump bear against the eccentric pin through the intermediary of a needle bearing. When the drive shaft, guided in rolling bearings, is turned, the pin which is eccentrically arranged at the shaft end performs an eccentric curve which results in the oscillating movement of the pump pistons.
Current designs, such as that described above, permit a limited variation in the delivery volume of pressure fluid by means of a speed control of the electric motor, for example. This result is due to the piston stroke which is determined by the eccentric curve. Typically required control engineering measures demand an improvement over currently-used designs.
SUMMARY OF THE INVENTION
The present invention relates to a motor pump assembly for slip-controlled brake systems that includes an eccentric device that facilitates varying the delivery volume of pressure fluid within the system.
It is, therefore, an object of the present invention to provide an improved drive assembly of the type described above. According to the present invention, the eccentricity of the eccentric device can be varied at will by simple means in order to achieve, for instance in the case of pumps, a control of the delivery volume which is adapted to the pressure fluid requirements of the consumer.
According to the present invention, the eccentric device is formed by means of eccentrics which are turnable relative to each other and are in mesh with each other in a form-fit manner so that the eccentricity of the eccentric and thus the pump piston stroke can be changed. By this means, expensive control and regulating sequences within the circuit controlling the drive motor become superfluous so that, according to the solution proposed in the present invention, a hydro-mechanical adjustment of the second eccentric can be achieved by means of the pressure level which is directly taken up via a control piston.
These and other objects and features of the present invention will be seen in the following specification and claims in conjunction with the appended drawings, of which the following is a brief description.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a longitudinal cross-sectional view of a radial piston pump.
FIG. 2 is a partial cross-sectional view of the radial piston pump of FIG. 1 along the line designated as A--A.
FIG. 3 is a top planar view of the actuating element arranged between the second eccentric and the control slide.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
FIG. 1 shows a drive shaft 3 associated with an electric motor, the drive shaft end being provided with a pin-shaped first eccentric 1. The end of the first eccentric 1 opposite the drive shaft 3 protrudes eccentrically into the control slide 5 which has the shape of a hollow cylinder. A key or wedge-shaped insert 8 is disposed within a longitudinal groove 7 of the first eccentric 1. The arrangement of wedge-shaped insert 8,
REFERENCES:
patent: 2348958 (1944-05-01), Celio
patent: 3628889 (1971-12-01), Kobayashi et al.
patent: 3827831 (1974-08-01), Lines
patent: 4022082 (1977-05-01), Uchimoto
patent: 4249424 (1981-02-01), Glazier
patent: 4768421 (1988-09-01), Schneeweiss
Reinartz Hans-Dieter
Steffes Helmut
Alfred Teves GmbH
Lewis J. Gordon
Look Edward K.
Ryznic John
Seitter Robert P.
LandOfFree
Motor pump assembly with variably set eccentric does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Motor pump assembly with variably set eccentric, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor pump assembly with variably set eccentric will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-499159