Pulley

About: Pulley is a research topic. Over the lifetime, 51636 publications have been published within this topic receiving 178220 citations. The topic is also known as: drum & block.

From transmission error measurement to Pulley-Belt slip determination in serpentine belt drives: influence of tensioner and belt characteristics

Abstract: Serpentine belt drives are often used in front end accessory drive of automotive engine. The accessories resistant torques are getting higher within new technological innovations as stater-alternator, and belt transmissions are always asked for higher capacity. Two kind of tensioners are used to maintain minimum tension that insure power transmission and minimize slip : dry friction or hydraulic tensioners. An experimental device and a specific transmission error measurement method have been used to evaluate the performances of a generic transmission by determining the pulley–belt slip for these two kinds of tensioner. Transmission error between pulleys, pulley/belt slip are deduced from pulley rotation angle measurements. Results obtained show that : the use of tensioner limits belt slip on pulleys, pulley–belt slip is reachable from transmission error measurement, belt non uniform characteristics are responsible of low frequency modulations of transmission error.

Belt drive system with automatic belt tension control

Abstract: The invention comprises a belt drive system for automatically controlling a belt tension. The system comprises an actuator controlled by a control module. The actuator operates on a pivoted pulley. A belt is trained about the pivoted pulley as well as other pulleys driving various accessories. A series of sensors in the system detect a belt condition including a belt tension. Sensor signals are transmitted to the control module. The control module processes the signals and instructs the actuator to move the pivoted pulley, thereby increasing or decreasing a belt tension. A feedback loop from the sensors to the control module allows the belt tension to be continuously monitored and adjusted many times per second. The system may actively control a belt tension by anticipating a system condition to prevent a belt noise by comparing sensor signals to instructions stored in a control module memory.

Robot joint driving apparatus and robot having the same

Abstract: Disclosed are a robot joint driving apparatus and a robot having the same, capable of minimizing tension of a wire applied to a movable member by installing an idle pulley in a power transmission structure using a ball screw apparatus and the wire. The robot joint driving apparatus includes a reversible drive motor, a pair of movable members performing a linear movement according to rotation of the reversible drive motor, a wire connected to the movable members from both directions of the movable members, an idle pulley rotatably installed at one side of the wire, a joint part rotatably installed at an opposite side of the wire, and an adjustment unit to adjust tension of the wire.

Synchronous compound bow with non-coplanar actuators and interchangeable leveraging components

Abstract: An archers bow comprising a center riser section, two primary resilient limbs, a pair of twin grooved, dual-planar compound pulleys, with the compound pulleys being employed in a multiple of possible ways with non-coplanar actuator elements for purposes of inducing mechanical advantage, with the mechanical advantage induced by the pulleys being used by the archer to aid in bending the limbs on the bow in a manner which eliminates pulley/actuator induced torsion from the system. The invention defines an actuator configuration for the pulleys consisting of one or more sections, including tensioning actuator sections and one actuator section that is suitable for use as a bowstring, and includes a method for connecting the tensioning actuators to the pulleys, and to terminating locations on a pair of resilient Pulley Return Energy Storage e.g. PRES components provided separately for that purpose, which, in an overall bow configuration, provides that aside from the bowstring section used by the archer to actuate the pulleys, no part of the actuator or actuators connected to the pulleys is ever positioned in a manner whereby the actuator or actuators would intersect the horizontal plane bisecting the riser assembly of the bow at any time. The invention further seeks to define, and provide methods for solving, a plurality of known, as well as some perhaps previously unknown, problems affecting compound bows which have not been successfully addressed previously. The inventive bow defines and incorporates combinations of interchangeable components which can be configured to produce a variety of energy storing patterns for archers of all draw lengths, while allowing use of decreased fistmele distances, which serves to lengthen acceleration stroke distances.

Weight lifting machine

Abstract: A weight lifting machine for performing a wide range of exercises, has a lift bar angularly adjustable for a starting lift position angularly upward or downward of a substantially horizontal position. An actuating bar is connected to the lift bar for movement therewith. First and second pulleys are movably mounted above and below the actuating bar such that the first pulley moves upwardly with the actuating bar and the second pulley moves downwardly with the actuating bar. The first pulley is prevented from moving downwardly when the second pulley is moved downwardly with the actuating bar and the second pulley is likewise prevented from moving upwardly when the first pulley is moved upwardly. A lift cable is threaded through the first and second pulleys such that movement of the lift bar in either direction lengthens the distance between the pulleys, thereby lifting a plate-type weight stack. The machine is also equipped with butterfly bars and a leg extension, with the lift bar, butterfly bars and leg extension all connected to the weight stack through a single lift cable.