Brakes – Internal-resistance motion retarder – Magnetic fluid or material
Patent
1996-07-02
1998-12-01
Oberleitner, Robert J.
Brakes
Internal-resistance motion retarder
Magnetic fluid or material
192 215, 310 92, F16F 1503
Patent
active
058425470
ABSTRACT:
A controllable brake (20) including a rotor (28) supported by a shaft (30) which is rotatably supported by bushings (42) received in housing (22). A coil assembly (48) creates a magnetic field within a pole piece (32), which is preferably manufactured from a powdered metal material, which preferably has a density of between about 6.8 and 7.0 gm/cm. A magnetically-soft medium is contained within first and second gaps (86, 88) located between pole piece (32) and rotor (28). In one aspect, a magnetic saturation zone (25) reduces the propensity of magnetizing the shaft (30). In another, the pole halves (24, 26) are received in radially-spaced pole pockets (37) formed in the housing (22) and include an axial bias spring (70) to ensure intimate contact. In another aspect, a lip projection (76) traps fluid (23) between the lip projection (76) and shaft (30) and minimizes fluid exposure to the shaft seal (44). In another aspect, cooling fins (55) or a projection (53) restrains rotation of the housing (22). In another aspect, a spring (46) centers the rotor (28) relative to the housing (22).
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Carlson J. David
Holzheimer John C.
LeRoy Douglas F.
Marjoram Robert H.
Prindle Donald R.
Lipka Pamela J.
Lord Corporation
Oberleitner Robert J.
Wayland Randall S.
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