Ball ramp brake

Details Ball ramp brake Ball ramp brake

2005-12-22

2010-06-15

Nguyen, Xuan Lan (Department: 3657)

Brakes

Wheel

Axially movable brake element or housing therefor

C188S072700, C188S072600

Reexamination Certificate

active

07735612

ABSTRACT:
A brake (10) for applying a braking force to a shaft includes a housing (11) which defines a chamber (17). The housing (11) includes a plurality of depressions (19) circumferentially spaced around an axis (22). A rotatable actuator (40) is received in the chamber (17) and includes a plurality of depressions (43) circumferentially spaced around the axis (22). The housing depressions (19) face the rotatable actuator depressions (43) and each matching pair of depressions receive a ball (23) therebetween. A spring (50) under compression is positioned centrally about the axis (22). A bearing (56) is interposed between the rotatable actuator (40) and disc assembly (70) which minimizes frictional effects and rotational feedback during brake actuation. When the rotatable actuator (40) is rotated, the balls (23) roll along the depressions (19, 43) to gradually shallower portions thereof. This moves the rotatable actuator (40) axially away from the housing (11), thereby applying a braking force to the shaft. The spring (50) compressively opposes the axial movement of the rotatable actuator (40) away from the housing (11).

REFERENCES:
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patent: 4372433 (1983-02-01), Mitchell et al.
patent: 6374958 (2002-04-01), Usui et al.
patent: 6481541 (2002-11-01), Taki et al.
patent: 2001/0023798 (2001-09-01), Usui et al.
patent: 2003/0164271 (2003-09-01), Boisseau
patent: 2004/0035655 (2004-02-01), Usui
patent: 2004/0262097 (2004-12-01), Gerard et al.
patent: 2005/0217949 (2005-10-01), Ohta
patent: 1 039 165 (2000-09-01), None
patent: WO 02/44582 (2002-06-01), None
Prior art drawing, Ausco Products, Inc., Benton Harbor, Michigan dated Apr. 8, 2002.
European Search Report for the corresponding European Application (Jul. 30, 2008).

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