A pulley device comprising a pulley and a bearing. The pulley has at least one “C-shaped” pulley part having an inner portion mounted on the bearing, an outer portion having an outer cylindrical surface dedicated to interact with a belt or a chain, and an intermediate portion extending substantially radially between axial ends of inner and outer portions on one axial side of pulley device. The outer cylindrical surface of outer ring is provided with at least one recess having in cross-section, a concave internal profile. The pulley part is provided with at least one protruding portion which inwardly extends beyond the inner cylindrical surface of inner portion. The protruding portion is received in a corresponding recess of outer ring so as to block the pulley part with respect to the outer ring in both axial directions.

An endless band drive system having a variable center distance between the drive pulley and the driven pulley also has a rotatable control shaft and an endless band guide, where the guide is positioned by the rotatable control shaft for maintaining a slackless endless band with change of pulley center distance. Rotation of the control shaft pivots the endless band guide thereby maintaining a slackless endless band with change of the pulley center distance. Preferably, the rotatable control shaft also provides means for adjusting the center distance between the drive pulley and the driven pulley. The present invention provides a slackless endless band system for a variable compression ratio engine having a variable center distance between the drive pulley mounted on the crankshaft and the driven pulley mounted on the camshaft. The system provides slackless operation of the endless band at two or more compression ratio values.

A powertrain system is described, and includes an internal combustion engine including a crankshaft and an electric machine including a rotatable shaft, wherein the rotatable shaft is coupled to a motor pulley. A torque converter includes an impeller and a pump, wherein the pump is coupled to an outer sheave. An off-axis mechanical drive system includes the outer sheave of the torque converter rotatably coupled to the motor pulley of the electric machine. The electric machine is coupled to the pump of the torque converter via the off-axis mechanical drive system, and the crankshaft is coupled to the pump of the torque converter via a clutch.

A four-hole core drilling machine of the invention includes a vertically reciprocating carriage mounted to a body, a motor coupled to the carriage, a fixing plate coupled to the carriage, to rotatably support a drive shaft of the motor, a pivoting plate fastened to the fixing plate under the condition that a pivot angle of the pivoting plate is changed, a drive pulley coupled to the drive shaft, to be rotatable by the drive shaft, four driven pulleys rotatably mounted to the pivoting plate near corners of the pivoting plate, four driven shafts rotatably mounted to the pivoting plate and coupled to the four driven pulleys, to be rotatable by the driven pulleys, a belt mounted around the drive pulley and the driven pulleys, to transmit rotation force of the drive pulley to the driven pulleys, and four core bits coupled to lower ends of the driven shafts.

A four-hole core drilling machine of the invention includes a vertically reciprocating carriage mounted to a body, a motor coupled to the carriage, a fixing plate coupled to the carriage, to rotatably support a drive shaft of the motor, a pivoting plate fastened to the fixing plate under the condition that a pivot angle of the pivoting plate is changed, a drive pulley coupled to the drive shaft, to be rotatable by the drive shaft, four driven pulleys rotatably mounted to the pivoting plate near corners of the pivoting plate, four driven shafts rotatably mounted to the pivoting plate and coupled to the four driven pulleys, to be rotatable by the driven pulleys, a belt mounted around the drive pulley and the driven pulleys, to transmit rotation force of the drive pulley to the driven pulleys, and four core bits coupled to lower ends of the driven shafts.

A coupling system can include an energy transfer device and a load mitigation system. The energy transfer device can include a shaft, gear, chain or piston-cylinder arrangement to transfer the energy from a power supply to an object to be moved. The load mitigation system can be used to limit or prevent the transfer of forces from the object to the drive unit as a result of external loads being applied to the object. The load mitigation system can be pre-loaded such that external loads on the object having an excessive impulsive or resonant cyclic force greater than the pre-load force on the load mitigation system are reduced and only partially transferred to the energy transfer device and power supply. The load mitigation system can dampen both resonant loads and impulsive impact loads occurring at the object thereby preventing damage and extending life.

A product for applying tension is disclosed. The product may include a block with a first bore opening into to the block. A body may be provided having a second bore substantially larger in diameter than the first bore. The body may be positioned against the block so that the first bore is open to the second bore. The body may have a passage for providing fluid to a pressure chamber from the second bore. The passage may be arranged to open to the second bore and form a tangent to the second bore. Fluid may flow from the first bore to the pressure chamber through the second bore and the passage substantially unimpeded. Fluid flow is impeded from the passage to the first bore as a result of the configuration of the first bore, second bore and passage.

A driving apparatus includes an endless belt, a belt roller which engages the endless belt, a steering member and an adjustment member. The belt roller has a rotation shaft. The steering member contacts the endless belt at the inner side of the endless belt. The adjustment member is supported rotatably. The adjustment member receives a force in response to the endless belt moving in a longitudinal direction of the rotation shaft of the belt roller, and generates a pressing force that tilts the steering member via a rotational movement of the adjustment member.

In an aspect, a system is provided for controlling tension in an endless drive member, and including an isolation device and a tensioning system. The isolation device is positioned on an accessory drive shaft and has a pulley and a biasing member to transfer force from the pulley to the accessory drive shaft. The isolation device pulley is engaged with the endless drive member, such that a first span of the endless drive member is on a first side of the isolation device pulley and a second span of the endless drive member is on a second side of the isolation device pulley. The tensioning system has a first tensioner pulley engaged with the first span and a second tensioner pulley engaged with the second span. The first and second tensioner pulleys are urged by first and second tensioner pulley biasing forces towards the first and second spans respectively.

In an aspect, a system is provided for controlling tension in an endless drive member, and including an isolation device and a tensioning system. The isolation device is positioned on an accessory drive shaft and has a pulley and a biasing member to transfer force from the pulley to the accessory drive shaft. The isolation device pulley is engaged with the endless drive member, such that a first span of the endless drive member is on a first side of the isolation device pulley and a second span of the endless drive member is on a second side of the isolation device pulley. The tensioning system has a first tensioner pulley engaged with the first span and a second tensioner pulley engaged with the second span. The first and second tensioner pulleys are urged by first and second tensioner pulley biasing forces towards the first and second spans respectively.