The present invention relates to a power transmission belt containing a frictional power transmission part and a fiber member that covers a surface of the frictional power transmission part, in which the fiber member is formed of a fiber (A) containing a water-absorbent fiber (A1) and contains a surfactant, to a fiber member used in the power transmission belt, and to a method for manufacturing the fiber member.

A composite elevator belt includes at least one load carrier strand extending in a longitudinal direction, a core layer encasing the at least one load carrier strand, and a first plurality of teeth extending transversely across a top surface of the core layer. The first plurality of teeth includes a root portion associated with the core layer and a tip portion. The composite elevator belt further includes a first jacket layer extending in the longitudinal direction, at least the tip portion of the first plurality of teeth being associated with a bottom surface of the first jacket layer.

This disclosure relates to methods and apparatuses of employing belts for an angular drive. A twisted geometry is applied to a first free span of the belt. A sheave supports the first free span of the belt at a first extremity of the first free span and sheave is at least one of positioning and orienting the rotating sheave or the driven sheave so as to misalign a geometric centerline of the first free span of belt at a given fleet angle with respect to a second extremity of the first free span.

A toothed belt includes a plurality of tooth parts that are disposed at predetermined intervals along the longitudinal direction and contain a rubber composition (A) as a base material and a back side that has a cord embedded therein and contains a rubber composition (B) as a base material, in which the cord contains a Lang-twisted carbon fiber and is formed in a diameter of 1.1 mm or more and 2.5 mm or less and the rubber composition (B) constituting the back side has a hardness of from 80 degrees to 89 degrees in JIS-A hardness.

A toothed belt includes a plurality of tooth parts that are disposed at predetermined intervals along the longitudinal direction and contain a rubber composition (A) as a base material and a back side that has a cord embedded therein and contains a rubber composition (B) as a base material, in which the cord contains a Lang-twisted carbon fiber and is formed in a diameter of 1.1 mm or more and 2.5 mm or less and the rubber composition (B) constituting the back side has a hardness of from 80 degrees to 89 degrees in JIS-A hardness.

In a friction transmission belt including a rubber layer forming a pulley contact surface, the rubber layer includes a rubber composition containing hydrophilic inorganic filler and a sliding-resistant material. The sliding-resistant material protrudes from the pulley contact surface, and is at least one of hydrophobic resin particles and hydrophobic resin fibers having an official regain of 0.4% or below, and in the rubber composition, a content of the hydrophilic inorganic filler with respect to 100 parts by mass of the rubber component is 35 parts by mass or more.

A belt drive and a method for the monitoring thereof allows conclusions to be drawn regarding loads to which the belt has been subjected over its past usage period. The method includes a rotatably mounted disc and a belt which is deflected at the disc. The belt and the disc are equipped with a marking and are positioned with respect to each other such that the markings are directly opposite each other in a trigger position when the belt circulates around the disc. The trigger position is recorded by a monitoring device, which emits a signal when the markings are located in the trigger position. The number of signals triggered over a time period is recorded. The loads to which the belt or the disc have been subjected during the time period is determined while taking into consideration relevant influencing variables.

In a friction transmission belt including a rubber layer forming a pulley contact surface, the rubber layer includes a rubber composition containing polyolefin particles and an inorganic filler. In the rubber composition, a total content of the polyolefin particles and the inorganic filler with respect to 100 parts by mass of a rubber component is 85 parts by mass or more.

In a friction transmission belt including a rubber layer forming a pulley contact surface, the rubber layer includes a rubber composition containing polyolefin particles and an inorganic filler. In the rubber composition, a total content of the polyolefin particles and the inorganic filler with respect to 100 parts by mass of a rubber component is 85 parts by mass or more.

A toothed belt includes: a back portion; at least one tension member embedded in the back portion; tooth portions arranged at a predetermined interval along a belt longitudinal direction on one surface of the back portion; and a tooth cloth covering a surface of the tooth portion and a part of the one surface of the back portion, in which the at least one tension member is a twisted cord including a high-strength glass fiber filament, a tooth pitch, a diameter of the at least one tension member, and a ratio of a thickness of the back portion to a thickness of the toothed belt are in a specific range, the tooth portion is constituted of a rubber composition, a hardness of the rubber composition at 23? C. is 73? or more and 83? or less, and the tooth portion has a specific shape.