The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 1995
Filed:
Jul. 13, 1993
Lawrence R Folsom, Decatur, GA (US);
Abstract
A continuously variable transmission includes a pump (258) driven by an input shaft (256) against a wedge-shaped swashplate (260). Hydraulic fluid pressurized in the pump flows through ports (402) in a pump cylinder block (422) into kidney-shaped slots (406) in the swashplate (260), and from there flows into and pressurizes a series of cylinders (394) in a motor cylinder block (366). The pump and motor exert first and second components of torque on a swashplate (260) in the rotational direction on the input shaft (256), and the hydraulic system pressure in the swashplate slots exerts a third component of torque in the same direction on the swashplate (260). The third torque component is a product of the hydraulic system pressure and the differential area of the two ends of the high pressure slot (406P) at the narrow and thick sides of the wedge-shaped swashplate (260). The swashplate (260) drives an output shaft (266) through an output sleeve (264) pinned to the outside peripheral edge ( 416) of the swashplate (260). The input/output ratio of the transmission is controlled by controlling the tilt angle of the swashplate (260) with a control sleeve (268), coupled at one end to the swashplate (260) through a coupling mechanism (267) and coupled at the other end through a bearing (528) to an axially movable control cylinder (270). The axial position of the control cylinder (270) is hydraulically controlled by a follower valve system (269) which moves the control cylinder (270) to positions uniquely corresponding to positions of a manually or automatically positioned control rod (636).