Automatic power transmission mechanism with a pressurized brake band anchor
First Claim
1. In an automatic transmission mechanism having a hydrokinetic torque converter and multiple ratio gearing, said converter having an impeller adapted to be connected to an engine and a turbine connected to an input element of said gearing, an output element of the gearing being adapted to be connected to a torque output member of said mechanism, at least one clutch and at least one brake forming a part of said gearing for controlling the relative motion of elements of the gearing to effect ratio changes;
- said brake upon application providing a reaction point for said gearing so that torque multiplication can be achieved, said brake comprising a brake drum, a brake band surrounding said brake drum having an operating end and an anchor end, a fluid pressure operated servo having a servo piston connected operatively to said operating end of said brake band;
an anchor piston connected operatively to said anchor end of said brake band, a cylinder receiving said anchor piston, said cylinder and said anchor piston defining a pressure cavity;
means for pressurizing said anchor piston with a threshold pressure to eliminate slack in said brake band when said servo piston is retracted;
orifice means for controlling the displacement of fluid from said cylinder by said anchor piston as said servo piston is stroked upon brake application;
said anchor piston having two pressure areas, one of said pressure areas being subjected to said threshold pressure to effect a drag force on said brake band and the other of said pressure areas being subjected to a reaction pressure as said anchor piston is stroked upon movement of said servo piston to a brake applying position.
1 Assignment
0 Petitions
Accused Products
Abstract
A reaction brake band assembly for a multiple ratio power transmission mechanism comprising a brake drum connected to a gear element of the transmission mechanism, and a reaction piston engaged by the anchor end of the brake band for applying a threshold brake band force and for cushioning brake band application.
22 Citations
2 Claims
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1. In an automatic transmission mechanism having a hydrokinetic torque converter and multiple ratio gearing, said converter having an impeller adapted to be connected to an engine and a turbine connected to an input element of said gearing, an output element of the gearing being adapted to be connected to a torque output member of said mechanism, at least one clutch and at least one brake forming a part of said gearing for controlling the relative motion of elements of the gearing to effect ratio changes;
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said brake upon application providing a reaction point for said gearing so that torque multiplication can be achieved, said brake comprising a brake drum, a brake band surrounding said brake drum having an operating end and an anchor end, a fluid pressure operated servo having a servo piston connected operatively to said operating end of said brake band; an anchor piston connected operatively to said anchor end of said brake band, a cylinder receiving said anchor piston, said cylinder and said anchor piston defining a pressure cavity; means for pressurizing said anchor piston with a threshold pressure to eliminate slack in said brake band when said servo piston is retracted; orifice means for controlling the displacement of fluid from said cylinder by said anchor piston as said servo piston is stroked upon brake application; said anchor piston having two pressure areas, one of said pressure areas being subjected to said threshold pressure to effect a drag force on said brake band and the other of said pressure areas being subjected to a reaction pressure as said anchor piston is stroked upon movement of said servo piston to a brake applying position. - View Dependent Claims (2)
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Specification