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:
Sep. 21, 1982
Filed:
Feb. 27, 1980
Herbert Steuer, Bad Homburg, DE;
P.I.V. Antrieb Werner Reimers GmbH & Co. KG, Bad Homburg, DE;
Abstract
An infinitely variable cone-pulley, belt-type transmission having at least two cone-pulley pairs each mounted on a respective shaft, with one axially displaceable cone-pulley of each pair being formed as a rotating pressure cylinder of a piston firmly connected with the associated shaft, and the pressure application forces are generated hydraulically in the cylinder in dependence upon load and transmission ratio. Such transmissions are further provided with a transmission ratio setting member and a control slide valve coupled therewith which distributes the pressure fluid to the pressure cylinders, at least one adjustable pressure control valve controlling the application pressure, in dependence on load and transmission ratio, in the return conduit of the control slide valve for the hydraulic pressure necessary on the drive-output side of the transmission. The pressure control valve is mounted to rotate with one shaft and includes a valve body which is actuatable by a movable intermediate member, e.g. a ball, which rests against a substantially axially extending wedge face of a V-shaped groove of the axially displaceable cone-pulley mounted on the same shaft. The control valve is mounted in the piston of that axially displaceable cone-pulley and the V-shaped groove is disposed on the outer circumferential surface of an axially extending neck portion of that cone-pulley which is enclosed by the piston or on the inner cylindrical surface of an axially extending portion of the cone-pulley which surrounds the piston and defines the rotating pressure cylinder wall.