Abstract: A reversible locking device 1 for a tensioner 100 of a timing chain 20 includes a locking device body 3, integral with the tensioner 100 and protruding with respect to the body of the tensioner 100, which has a shaped slot 2. A perforated protrusion 4 is integral with the shoe 5 carried by the piston 6 and protrudes with respect to the shoe 5 so that its hole is aligned with the shaped slot. A rod 7 has a first part 8 with a shape complementary to that of the shaped slot 2 and a second part 9 bearing at one end a conical portion 10 adapted to couple it irreversibly to the perforated protrusion 4 integral with the shoe 5.

Abstract: A hydraulic tensioner is provided with a no-return device and with an anti-rotation device capable of being disabled having a pin, integral with the cylinder of the tensioner, which slides in a first longitudinal slot formed on the outer wall of the piston and a means able to disable the anti-rotation device. The disabling means includes a second slot, at right angles with respect to the first longitudinal slot to which it is connected, situated at the end of the first longitudinal slot nearer to the bottom of the cylinder. The second slot may also be a throat connected to the first longitudinal slot to which it is perpendicular, and which extends for the whole circumference of the piston. The second slot is preferably shaped as a ramp to join the bottom of the first longitudinal slot to the outer surface of the piston.

Abstract: A reversible locking device 1 for a tensioner 100 of a timing chain 20 includes a locking device body 3, integral with the tensioner 100 and protruding with respect to the body of the tensioner 100, which has a shaped slot 2. A perforated protrusion 4 is integral with the shoe 5 carried by the piston 6 and protrudes with respect to the shoe 5 so that its hole is aligned with the shaped slot. A rod 7 has a first part 8 with a shape complementary to that of the shaped slot 2 and a second part 9 bearing at one end means 10 adapted to couple it irreversibly to the perforated protrusion 4 integral with the shoe 5.

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.

Abstract: A hydraulic tensioner is provided with a no-return device and with an anti-rotation device capable of being disabled having a pin, integral with the cylinder of the tensioner, which slides in a first longitudinal slot formed on the outer wall of the piston and a means able to disable the anti-rotation device. The disabling means includes a second slot, at right angles with respect to the first longitudinal slot to which it is connected, situated at the end of the first longitudinal slot nearer to the bottom of the cylinder. The second slot may also be a throat connected to the first longitudinal slot to which it is perpendicular, and which extends for the whole circumference of the piston. The second slot is preferably shaped as a ramp to join the bottom of the first longitudinal slot to the outer surface of the piston.

Abstract: A guide device for a chain of an internal combustion engine includes a support structure and a body. The support structure is mounted to the engine and has at least one protruding body at one end of the structure on a first side. The body has a chain sliding surface that slidably receives the chain. Opposite the chain sliding face is a seat for receiving the protruding body of the support structure. The seat is symmetrically shaped and receives the protruding body in a first position and a second position. The first position is specular to the second position.

Abstract: A check valve for a hydraulic chain tensioner comprising a substantially cylindrical body, a first ball, a second ball, and a spring. The cylindrical body has a first aperture at one end and a second aperture at an opposite end. The first aperture in the cylindrical body connects the hydraulic chain tensioner to a pressurized fluid source and the third aperture allows pressurized fluid to flow out of the hydraulic tensioner. The first ball is seated in a first aperture and the second ball is seated in a second aperture. The spring is located between the first and the second ball, biasing the first ball to seat and block fluid from returning from the hydraulic chain tensioner to the pressurized fluid source.