| 摘要 |
PCT No. PCT/EP88/00696 Sec. 371 Date May 30, 1989 Sec. 102(e) Date May 30, 1989 PCT Filed Aug. 1, 1988 PCT Pub. No. WO89/01098 PCT Pub. Date Feb. 9, 1989.An apparatus is proposed for tensioning V-belts, especially for automotive vehicles, said apparatus comprising a length-variable link member (6) for tensioning a pulley against the V-belt. The link member comprises a casing (10) carrying a connection bearing (9), and a piston rod (8) guided within the casing and carrying a further connection bearing (7), and a helical compression spring (18) fixed between a spring rest (19) of the casing and a spring rest (20) of the piston rod. Automatic compensation of variations in the effective length of the V-belt loop without any belt vibrations or fluttering at higher rotational speeds is achieved by the feature that from the bottom of the casing (10) there extends an upright cylinder (14) which comprises and guides a piston portion (13) of the piston rod with a clearance permitting leakage flow of pressurized liquid, the pressurized liquid-filled cylinder space (16) of said cylinder being communicated, on the one hand, with a casing interior space (17) between the piston rod or the cylinder comprising the same, respectively, and on the other hand with the casing surface via a system of passageways (26, 27, 28) having a check valve (29) disposed therein.
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