Eccentric system

Details Eccentric system Eccentric system

2001-03-29

2003-04-22

Lavinder, Jack (Department: 3613)

Bearings

Rotary bearing

Antifriction bearing

C384S255000, C384S569000

Reexamination Certificate

active

06550971

ABSTRACT:

TECHNICAL FIELD
The present invention generally relates to fluid pumps and more particularly relates to pump shaft assemblies using eccentric elements.
BACKGROUND OF THE INVENTION
Eccentric arrangements of this type are used in many ways for the conversion of rotary motions in linear motions, and they are especially well suited for the employment in radial piston pumps. DE 196 36 508 A1 discloses an eccentric arrangement which is used in a radial piston pump for the delivery of brake fluid in controlled automotive vehicle brake systems. The principal operation of pumps of this type involves that an electromotively driven eccentric shaft drives at least two pistons moving in opposite directions by way of the eccentric. To prevent the eccentric shaft from dragging on the drive-side ends of the pistons, a radial bearing is mounted on the eccentric of the drive shaft which follows the radial movements of the eccentric, but is stationary with respect to the drive-side ends of the piston. The radial bearing is designed with a bearing bushing that is open on either side in an axial direction or embraces the eccentric pin on one side, with the result that the radial bearing fixed to the eccentric in the eccentric arrangement described above is secured axially in one direction only, or is not secured at all.
DE 196 32 167 also describes an eccentric arrangement, wherein a radial bearing slipped onto an eccentric ring is also fixed only axially in one direction. Due to vibrations caused in the pumping operation there is the risk that the bearings displace from their position.
An object of the present invention is to configure an eccentric arrangement so that axial displacement is encountered to a minimum extent only, or is prevented at all.
The invention of the eccentric arrangement generally includes designing the bearing bushing of the radial bearing, that is arranged at the eccentric ring, as a cage in such a way that the radially directed lateral walls of the bearing bushing embrace the end surfaces of the eccentric ring. It is a basic advantage of the present invention that the degree of axial freedom of motion of the bearing is limited to a necessary minimum. This is achieved in that the inside surfaces of the radially directed lateral walls of the eccentric bearing may move into abutment on the end surfaces of the eccentric ring in both axial directions. This safeguards that free displacement of the eccentric bearing is prevented.
In a preferred embodiments, it is advisable to reduce the friction between the end surfaces of the eccentric ring and the inside surfaces of the radially oriented lateral walls of the bearing bushing. When the inside surfaces of the radially oriented lateral walls of the bearing bushing are configured as abutment surfaces, friction may be reduced considerably. To this end, the present invention proposes providing the abutment surfaces with a smooth surface by grinding or coating them. As a coating, plastic material or a hard, smooth metal layer may advantageously be used. For a further reduction of friction, favorably, the end surfaces of the eccentric ring can be designed like the abutment surfaces of the bearing bushings.


REFERENCES:
patent: 2676074 (1954-04-01), Nusbaum
patent: 5230275 (1993-07-01), Hodge et al.
patent: 5348382 (1994-09-01), Ebaugh et al.
patent: 5385413 (1995-01-01), Murphy et al.
patent: 5573386 (1996-11-01), Schmitt et al.
patent: 5577846 (1996-11-01), Takahashi et al.
patent: 5785430 (1998-07-01), Bright et al.
patent: 6158326 (2000-12-01), Burgdorf et al.
patent: 6202538 (2001-03-01), Scharinger et al.
patent: 6220760 (2001-04-01), Ruoff et al.
patent: 6240826 (2001-06-01), Zernickel et al.
patent: 14 53 475 (1969-02-01), None
patent: 38 21 124 (1989-01-01), None
patent: 89 10 325 (1990-08-01), None
patent: 195 06 796 (1995-10-01), None
patent: 196 25 686 (1998-01-01), None
patent: 196 48 319 (1998-01-01), None
patent: 196 32 167 (1998-02-01), None
patent: 196 36 508 (1998-03-01), None
patent: 197 20 615 (1998-06-01), None
patent: 197 04 752 (1998-08-01), None
patent: 197 11 557 (1998-09-01), None
patent: 0 325 680 (1989-08-01), None
patent: 0 539 849 (1993-05-01), None

Affiliated with

Also associated with

Rating

Eccentric system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Eccentric system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Eccentric system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3059942