Electromagnetic inertia brake for a power input shaft of a power transmission mechanism
First Claim
Patent Images
1. An electromagnetic brake for a power input shaft of a multiple-ratio transmission mechanism in a vehicle powertrain having an engine and a disconnect clutch between the power input shaft and the engine;
- the electromagnetic brake having an armature drivably connected to the power input shaft;
an electromagnetic coil housing connected to a housing for the transmission mechanism;
an electromagnetic coil in the coil housing adjacent the armature, the electromagnetic coil and the coil housing defining an electromagnetic pole face, the armature and the pole face defining a pre-determined air gap therebetween; and
a spring-loaded insert carried by the coil housing for applying a brake disengaging force on the armature when the armature is attracted toward the pole face as the electromagnetic coil is energized, whereby the armature is released from frictional contact with the pole face when the electromagnetic coil is de-energized.
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Abstract
An electromagnetic brake for an input shaft of a vehicle transmission is disclosed. The brake includes an armature separated from an electromagnetic coil pole face by a controlled air gap. A spring release feature ensures precise armature disengagement when the brake is deactivated. A wear compensation feature maintains uniformity of the air gap.
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Citations
20 Claims
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1. An electromagnetic brake for a power input shaft of a multiple-ratio transmission mechanism in a vehicle powertrain having an engine and a disconnect clutch between the power input shaft and the engine;
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the electromagnetic brake having an armature drivably connected to the power input shaft; an electromagnetic coil housing connected to a housing for the transmission mechanism; an electromagnetic coil in the coil housing adjacent the armature, the electromagnetic coil and the coil housing defining an electromagnetic pole face, the armature and the pole face defining a pre-determined air gap therebetween; and a spring-loaded insert carried by the coil housing for applying a brake disengaging force on the armature when the armature is attracted toward the pole face as the electromagnetic coil is energized, whereby the armature is released from frictional contact with the pole face when the electromagnetic coil is de-energized. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electromagnetic brake for a power input shaft of a multiple-ratio transmission in a vehicle powertrain having an engine and vehicle traction wheels, the transmission defining multiple ratio power flow paths from the engine to vehicle traction wheels;
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the electromagnetic brake having an armature drivably connected to a power input shaft for the transmission; an electromagnetic coil housing connected to a housing for the transmission; an electromagnetic coil in the coil housing adjacent the armature, the electromagnetic coil and the coil housing defining an electromagnetic pole face, the armature and the pole face defining a pre-determined air gap therebetween; and an armature stop member connected to the coil housing adjacent the armature for limiting movement of the armature away from the electromagnetic pole face as the electromagnetic coil is de-energized, thereby maintaining the pre-determined air gap. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An electromagnetic brake for a power input shaft of a multiple-ratio transmission in an engine powered vehicle powertrain having multiple geared power flow paths through the transmission to vehicle traction wheels;
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the electromagnetic brake having an armature connected drivably to a power input element of the transmission; an electromagnetic coil housing connected to a housing for the transmission; an electromagnetic coil in the coil housing adjacent the armature a spring-loaded insert and spring carried by the coil housing, the spring-loaded insert being adjustable by the spring relative to the coil housing in a direction parallel to a geometric axis of the power input shaft; an insert stop in the coil housing whereby movement of the spring-loaded insert effects movement of the armature to establish a first controlled air gap between the armature and the coil housing; a spring support element for anchoring the spring; and an adjustable slip joint between the spring support element and the coil housing; the spring-loaded insert and the spring support element having a second controlled air gap therebetween; the adjustable slip joint yielding under a predetermined friction brake force when the first air gap, due to wear at the armature and coil housing interface, increases relative to the second air gap whereby the electromagnetic brake will remain in adjustment to effect a fast response to a braking command and to effect optimum brake wear capacity. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification