US 2003/0171178 A1Published application

Hydraulic tensioner of the hollow piston type with a screw-type retaining device

AssigneeMorse TEC Europe S.p.A.

InventorBruno Maino

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Abstract

A cartridge tensioner (10) for drive transmission belts and chains comprises a cylinder (12) with a cylinder bore, a piston (14) slidably received in the cylinder bore and provided with a piston bore (40), a vent device (16) housed in the piston bore and comprising an end part and a stem integral with each other, a pressure spring (18) acting between a shoulder of the cylinder and the vent device, and a retaining device (20), accessible from the outside of the cylinder. The retaining device, in a position engaged with the stem of the vent device, retains the vent device preventing the action of the spring on the piston, and, in a position of disengagement from the stem of the vent device, allows the spring to bias the device against the piston and to act consequently on the piston.

Claims7

Dependent claims

A cartridge tensioner for transmission belts or chains comprising:

a) a cylinder comprising a cylinder bore;
b) a piston slidably received in the cylinder bore and provided with a piston bore;
c) a vent device slidable in the piston bore, comprising an end part and a stem,
wherein the end part and the stem are integral with each other;
d) a pressure spring acting between a shoulder of the cylinder and the vent device;
and
e) a retaining device for the vent device, accessible from the outside of the cylinder;
wherein when the retaining device is in a first position of engagement with the stem of the vent device, the retaining device retains the vent device;
and
wherein when the retaining device is in a second position of disengagement from the stem of the vent device, the retaining device allows the pressure spring to bias the vent device against the piston and to act consequently on the piston.

7 more elements

Dependencies are inferred from the claim text.