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US 4,228,691 AGranted
Variable pulley transmission
AssigneeBorg-Warner Corporation
InventorRichard L. Smirl
Life of this patent
Estimating the term…
Abstract
A variable pulley transmission especially adaptable for use in a passenger vehicle which comprises driver and driven pulleys connected by a flexible belt, the spacing between the pulleys and thus the drive ratio being controlled by a hydraulic control arrangement which is both engine speed and torque responsive.
Claims11
A variable pulley transmission for a vehicle comprising:
- a driver shaft;
- a driven shaft;
- a rotatable driver pulley connected to said driver shaft;
- driving means for rotating said driver shaft;
- said driver and driven pulleys each comprising an axially fixed flange and an axially movable flange;
- belt means drivingly connecting said pulleys;
- spring means operatively associated with said driver and driven axially movable flanges normally urging said movable flanges axially toward said driver and driven fixed flanges;
- hydraulic control means operatively associated with said pulleys to provide an additional load to the load of said spring means to thereby change the relative positions of the flanges of said pulleys and thus change the speed ratio therebetween;
- said hydraulic control means comprising:
- a pair of fixed displacement pumps, one of which provides pressure responsive to the speed of said driving means and the other of which provides pressure responsive to the torque of said driving means;
- a hydraulic cylinder and a piston in said cylinder;
- said driver pulley movable flange being connected to said piston;
- said cylinder being connected to said pump providing torque responsive pressure;
- and
- a speed and torque responsive valve in the connection between said pump providing said torque responsive pressure in said cylinder.
12 more elements
A variable pulley transmission for a vehicle comprising:
- a driver shaft and a driven shaft;
- a rotatable driver pulley connected to said driver shaft and a rotatable driven pulley connected to said driven shaft, each pulley comprising an axially fixed flange and an axially movable flange;
- driving means for rotating said driver shaft;
- belt means drivingly connecting said pulleys;
- spring means operatively associated with said driver and driven axially movable flanges normally urging said movable flanges toward said driver and driven fixed flanges;
- said spring means operatively associated with said driven axially movable flange being so constructed and arranged to provide a higher load on said axially movable driven pulley than the spring means operatively associated with said axially movable driver pulley flange;
- and
- hydraulic control means which is speed and torque responsive operatively associated with said pulleys to change the relative positions of the flanges of said pulleys and thus change the speed ratio therebetween.
5 more elements
Dependencies are inferred from the claim text.