Pressure spring system for hydraulically operated traction unit tensioner utilized for stretching e.g. belt, has piston longitudinally-movably arranged in piston housing, where system partially radially encloses piston housing and piston

摘要

The system (1) has two coaxially spaced spring elements (3, 4) i.e. helical springs, separated from each other by gradated movably mounted sliding bushing (5). A traction unit tensioner (2) comprises a housing (6) and a central piston housing (7) that is mounted in the housing. A piston (8) is longitudinally-movably arranged in the piston housing, where the system partially radially encloses the piston housing and the piston. The sliding bushing is designed as a cylinder (18a), which comprises a disk-shaped projection (17) forming a stage (11) at one end.