Combined service and parking brake apparatus
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United States of America Patent
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Nov 14, 2006
Issued Date -
N/A
app pub date -
Dec 14, 2005
filing date -
Dec 16, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a brake apparatus, a lead in a meshed portion between an external-thread portion (second stationary screw element) of a threaded shaft and an internal-thread portion (second movable screw element) of a nut is shorter than that in a meshed portion between an internal-thread portion (first stationary screw element) of a cylinder and an external-thread portion (first movable screw element) of a second piston. Accordingly, as the second piston and the nut move toward a control chamber while rotating in a unitary condition via a friction clutch, the second piston and the nut are united via the friction clutch, so that a contact portion between the thread surface of the second stationary screw element and the thread surface of the second movable screw element and a contact portion between the thread surface of the first stationary screw element and the thread surface of the first movable screw element push out against each other.
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