A stack of disk springs are placed between a second piston of a dual hydraulic variable force tensioner system and a hydraulic tensioner arm to allow much higher spring rates if desired. The springs may be stacked in multiple configurations to provide different spring rates. Package space can be reduced depending on the number of springs and orientations of said springs within the tensioner arm.

A stack of disk springs are placed between a second piston of a dual hydraulic variable force tensioner system and a hydraulic tensioner arm to allow much higher spring rates if desired. The springs may be stacked in multiple configurations to provide different spring rates. Package space can be reduced depending on the number of springs and orientations of said springs within the tensioner arm.

A chain damper for use with a bicycle may include a base having an attachment region that is configured to be attached to a bicycle and a chain receiving portion extending from the base in a first direction. The chain receiving portion can include a chain damping surface that includes a resiliently deformable damping material and at least partially bounds a chain receiving aperture. The chain receiving aperture may extend in an axial direction and may be configured so that when the chain damper is attached to the bicycle the axial direction is substantially aligned with the primary chain direction and the chain damping surface is spaced apart from the chain travel path.

To provide a universal design chain guide that can provide a position, track, and length of contact between the chain guide and the chain for optimal performance even when used with different types of chains. The chain guide includes a guide surface slidably guiding a running chain and at least one mounting part. The guide surface includes a first guide surface extending along a longitudinal direction and a second guide surface parallel to and protruding more than the first guide surface. The second guide surface protrudes from the first guide surface with varying heights along the longitudinal direction.

To provide a universal design chain guide that can provide a position, track, and length of contact between the chain guide and the chain for optimal performance even when used with different types of chains. The chain guide includes a guide surface slidably guiding a running chain and at least one mounting part. The guide surface includes a first guide surface extending along a longitudinal direction and a second guide surface parallel to and protruding more than the first guide surface. The second guide surface protrudes from the first guide surface with varying heights along the longitudinal direction.

A robot includes a power source and a power transmission mechanism configured to transmit an output of the power source. The power transmission mechanism includes a fixed member, a first pulley configured to rotate around a first axis with respect to the fixed member, a second pulley disposed to be separated from the first pulley and configured to rotate, with respect to the fixed member, around a second axis parallel to the first axis, a belt wound around the first pulley and the second pulley and configured to transmit the rotation of one of the first pulley and the second pulley to another, a restricting member including a restricting section disposed to be opposed to the belt with a gap in a portion where the first pulley and the belt mesh with each other, and a screw having a center axis along the first axis and configured to fix the restricting member to the fixed member. The restricting member rotates around the center axis to thereby change a separation distance between the restricting section and the belt in a plan view from a direction extending along the first axis.

A robot includes a power source and a power transmission mechanism configured to transmit an output of the power source. The power transmission mechanism includes a fixed member, a first pulley configured to rotate around a first axis with respect to the fixed member, a second pulley disposed to be separated from the first pulley and configured to rotate, with respect to the fixed member, around a second axis parallel to the first axis, a belt wound around the first pulley and the second pulley and configured to transmit the rotation of one of the first pulley and the second pulley to another, a restricting member including a restricting section disposed to be opposed to the belt with a gap in a portion where the first pulley and the belt mesh with each other, and a screw having a center axis along the first axis and configured to fix the restricting member to the fixed member. The restricting member rotates around the center axis to thereby change a separation distance between the restricting section and the belt in a plan view from a direction extending along the first axis.

According to the present embodiments, it is possible to ensure normal steering and the driver's safety by preventing jumping without proper engagement between the teeth of the pulley and the belt.

According to the present embodiments, it is possible to ensure normal steering and the driver's safety by preventing jumping without proper engagement between the teeth of the pulley and the belt.

A method of fabricating a chain tensioner includes bending a sheet metal blank to form a connector portion perpendicular to a flat base. The connector portion has an arm extending beyond the base. The method further includes stamping an end of the arm to curl the end into a hollow cylinder having an axis perpendicular the flat base. Curling the end into a hollow cylinder may be performed in a series of stamping operations. The blank may define a gap which extends around a narrower portion of the arm after the end is curled into the hollow cylinder.