The present disclosure relates to a belt driven system. The belt driven system may include a master pulley, a slave pulley, a belt around the master pulley and the slave pulley, a tension pulley configured to tension the belt, and a position adjusting device configured to automatically adjust a position of the tension pulley based on an interaction of the tension pulley and the belt.

A hydraulic traction mechanism tensioner for a traction mechanism drive of a motor vehicle, having a housing, and a valve which has an actuating element and is inserted in a fluid supply channel of the housing, wherein the valve hydraulically connects a first channel section of the fluid supply channel which opens into the pressure chamber to a hydraulic supply in a first position of the actuating element, and disconnects the first channel section from the hydraulic supply in a second position of the actuating element, wherein the valve is configured as a pressure regulating valve, wherein the actuating element can be moved beyond the second position into at least one further, third position, with the result that a volume of the first channel section is increased in comparison with the second position.

The disclosure relates to a method for detecting belt slip of a belt drive driving a generator of an internal combustion engine, said belt drive having a belt tensioner that can be adjusted in operation and adjusts the pre-tensioning force of the belt according to the detected belt slip. According to said method, the rotational speed profile of the crankshaft is recorded during an angular window of the crankshaft of m.Math.360 degrees and an average value of the crankshaft rotational speed is formed from said rotational speed profile; temporally independently from the recording of the rotational speed profile of the crankshaft, the rotational speed course of the generator shaft is recorded during an angular window of the generator shaft of n.Math.u.sup.1.Math.360 degrees and an average value of the generator shaft rotational speed is formed from said rotational speed profile.

A traction mechanism tensioning unit (1) for a traction mechanism drive of a motor vehicle is provided. The traction mechanism tensioning unit (1) includes a housing (2) in which a hydraulic tensioner (3) is arranged, the hydraulic tensioner (3) has a cylinder element (4) connected rigidly to the housing (2), in which an axially moving piston (5) is arranged, a compression spring (18) is arranged for generating an axial tensioning force on the piston (5) in a compression chamber (6) formed between the cylinder element (4) and the piston (5), and the hydraulic tensioner (3) is fluidly connected to a pressurized medium supply line (8) via a pressure control valve (7) arranged in the housing (2) for realizing a constant pressurized medium pressure in the compression chamber (6).

A base and movable platform are connected by a linearly extendable member, so that a motor may be adjustably located at a desired distance from other machinery which receives power. A motor mounted on such a movable platform may be linearly displaced so that belts, chain, or silent chain or the like may be adjusted to operate at a desired tension.

In another embodiment, a motor driving a gear train may be adjusted so that the depth of engagement of meshed teeth and the allowable backlash between a driving gear on the motor and a driven gear may be adjusted and controlled.

An automatic belt tension control system may be constructed by adding a tension sensor and a control module configured to maintain operating tensions within a preferred range and optionally to emit alarms or command a shutdown if an unsafe condition is detected.

A chain tensioner includes an oil supply passage for supplying hydraulic oil into a pressure chamber defined by a cylinder and a plunger, and a check valve provided at the end of the oil supply passage. A leak gap is defined between the sliding surfaces of the cylinder and the plunger. The plunger is biased by a return spring in the direction in which the plunger protrudes out of the cylinder. A plug is press-fitted in a cylindrical inner periphery of a through hole formed in the plunger to extend from a protruding end surface of the plunger to the pressure chamber to define an air vent passage. It is possible to change the hydraulic damper force simply by replacing the plug with another different type of plug to define a different air vent passage.

A manual drive assembly for a manually-operated window treatment based on a drive chain formed as a loop, may incorporate one or more intermediate tensioners disposed between two ends of the loop. The loop may be formed between a manual clutch mechanism coupled to the window treatment and an end tensioner. The one or more intermediate tensioners may serve to limit slack in the loop such that sides of the loop cannot be pulled to create a large loop, for example, having a gap of four inches or greater, between the hanging sides of the cord.

An automatic tensioning apparatus is provided that includes a tensioning drive unit having: a longitudinally extending stationary base frame with a plurality of guides extending between a lower portion and an upper portion, and a plurality of rotatable feed wheels axially secured at the lower portion, as well as a translatable drive frame slidably coupled to the plurality of guides with a drive assembly coupled to the drive frame, the drive assembly including a drive motor and a tensile member interface for engaging and rotationally translating a tensile member. The tensioning drive unit further including a plurality of drive frame actuators actuatable to move the drive frame between a bottom frame position and a top frame position, as well as a sensor for at least indirectly sensing the position of the drive frame along a longitudinal base frame axis.

The invention relates to a tensioner (100) comprising: a hollow body (10) provided with a bottom (12), said bottom comprising a central zone (120), a peripheral zone (121) raised relative to the central zone and an intermediate zone (122) an axis (30) two guide means (40, 50) for said axis two cups (60, 124), the cup (124) comprising a first portion (124A) in front of the peripheral zone and a second portion (124B) in front of the intermediate zone a spring (70) held between the cups and arranged around the second guide means so that there is a gap between the spring and the second guide means a valve (80) with a channel (90), the channel opening in front of the second portion of the cup (124) away from said second portion.

Provided is a tensioner capable of reducing a machining or mounting load and preventing leakage of oil from a surface for mounting a tensioner with a simple configuration. A tension body having a plunger-receiving hole into which a plunger is slidably inserted is configured to have a projection portion on a mounting surface that face a wall surface having an oil discharge hole of amounting target object. The projection portion is configured to be inserted into the oil discharge hole and to be continuously connected to the oil supply path formed in the tensioner body to form an oil passage.