A belt tension control system may include a first belt engager to engage a first portion of a belt extending between and on a first side of first and second pulleys and a second belt engager to engage a second portion of the belt extending between and on a second side of the first and second pulleys. The first belt engager is movably supported so as to move in response to changes in tension of the first portion of the belt. The second belt engager is movably supported so as to move in response to changes in tension of the second portion of the belt. The first belt engager and the second belt engager are connected by a linkage such that movement of the first belt engager towards the first portion of the belt automatically retracts the second belt engager away from the second portion of the belt, wherein the linkage automatically maintains a constant ratio of belt tension of the first portion to belt tension of the second portion.

A method for controlling a belt connecting an engine and a hybrid integrated starter and generator (HSG) of a hybrid vehicle includes steps of: driving an engine of the hybrid vehicle; detecting a rotational speed of the engine and a rotational speed of the HSG; and controlling a tension of the belt connecting the engine and the HSG by using the rotational speed of the engine and the rotational speed of the HSG.

A belt drive for a work machine is disclosed. The belt drive has a drive belt that is wound around an input pulley and an out put pulley. The input pulley is rotated by a motor, and when rotated, transfers rotational motion to the output pulley by the drive belt. A controller is in communication with an input speed sensor that measures the input pulley and an output speed sensor that measures the output pulley. The controller calculates an input speed from the measurement of the input pulley, and an output speed from the measurement of the output pulley. The controller also sends a damaged belt signal to an operator control of the work machine when the output speed is lower by a predetermined threshold than the input speed.

An auto tensioner is supported on one side surface of a cylinder block (the outer surface of a front wall part) via a bracket. The auto tensioner includes: a tension pulley that is pressed against a belt; an arm that rotatably supports the tension pulley and is swingably supported to the bracket; and a hydraulic actuator that is supported by the arm and bracket to adjust the pressing force of the tension pulley to the belt using a predetermined position of the arm as a supporting point. The hydraulic actuator is disposed outside the water pump on the front wall part of the cylinder block.

A tensioner system for a flexible drive member has: a slider configured for abutting the flexible drive member; a tensioner body supporting the slider; a biasing member arranged for biasing the slider toward the flexible drive member via the tensioner body; and a latch having a latched position and an unlatched position. In the unlatched position, the latch permits the biasing member to move the slider toward the flexible member. In the latched position, the latch prevents the biasing member from moving the slider toward the flexible member. A drivetrain and a vehicle having the tensioner system are also disclosed.

The invention relates to a belt-tensioning device comprising a tensioning device for generating a force for tensioning a belt in a belt drive; a measuring device for measuring a belt tension or a measurement variable corresponding to the belt tension; and an adjustment device for adjusting the force generated by the tensioning device based on signals of the measuring device.