40 results about "Contact radius" patented technology

A motor transmission element includes an axle, an expandable circumferential component and multiple rolled electroactive polymer (EAP) devices. The circumferential component is located at a contact radius from the axle for connection to a different rotating body and is mechanically connected to the axle. The rolled EAP devices are mechanically connected to the circumferential component and the axle. Each rolled EAP device has a pair of input electrodes and is configured to deform substantively parallel to a roll longitudinal axis upon application of a voltage difference. Deformation of a rolled EAP device causes a change in the contact radius. A voltage difference that expands the rolled EAP device increases the contact radius, and thereby the circumference of the transmission element. By varying the voltage, a continuously variable ratio can be achieved between a rate of rotation of the transmission element and a rate of rotation of the second body.

During Low return control, in which a speed ratio determined by a contact radius of a V-belt (4) with a non-rotating primary pulley (2) and a non-rotating secondary pulley (3) is shifted toward lowest speed ratio while the vehicle is stationary, an estimated speed ratio (ic) is calculated on the basis of a secondary pulley pressure (Psec). When a start request is issued to the vehicle while Low return control is underway, a primary pulley pressure (Ppri) and the secondary pulley pressure (Psec) are controlled on the basis of the estimated speed ratio (ic).

A control apparatus of a driving force in case of belt slipping includes a belt slip control detecting unit adapted to detect that the belt slip control is in execution, a belt contact radius ratio calculating unit adapted to calculate a belt contact radius ratio of the V-belt to the pulleys, and a power source output torque determining unit adapted to determine a target power output torque according to the belt contact radius ratio in execution of the belt slip control in response to signals from the belt slip control detecting unit and the belt contact radius ratio calculating unit.

A method of measuring the elastic modulus and hardness of a thin film on substrate using nanoindentation technique is provided. The method includes calculating a series of experimental corrected stiffness and contact radius pairs associated with one or more presumed parameters and information obtained from a loading curve associated with the thin film and substrate. Also, the method includes calculating a series of theoretical corrected stiffness and contact radius pairs associated with the same one or more presumed parameters and information obtained from the loading curve associated with the thin film and substrate. Furthermore, the method includes using results obtained from the experimental and theoretical corrected stiffness and contact radius pairs to compute the elastic modulus and hardness of the film material.

The invention provides a power splitting planetary ring bevel gear type stepless speed changer. A planetary ring bevel gear type stepless speed changer and a differential gear train are combined. A small part of power is transmitted through rotation and revolution of planetary ring bevel gears and the differential gear train, most of power is transmitted through a power input shaft and a planetary carrier, and the two parts of power are synthesized on synchronous planetary gears and then transmitted to an output shaft, so that power splitting is finished. Stepless speed changing drive is achieved through changing the contact radius of the speed regulation rings and the planetary ring bevel gears. The power splitting planetary ring bevel gear type stepless speed changer has the advantages of being stable in drive, good in starting performance, capable of being stably started from zero under full loads and adapted to work of variable working conditions, long in service life and wide in speed changing range. In comparison with an existing planetary type stepless speed changer, the power splitting can be achieved, meanwhile, power reflowing is avoided, high power transmission is achieved, geometrical slipping is reduced to the minimum, and transmission efficiency is higher.

The invention discloses a stepless transmission. The stepless transmission comprises an input component, an output component and columnar cones. A rotation axis of the input component and a rotation axis of the output component are collinear; the columnar cones are arranged at intervals around the rotation axes peripherally and clamped between the input component and the output component; each columnar cone comprises a middle cylindrical section, an input conical section and an output conical section, wherein the input conical section and the output conical section are arranged at two ends of the middle cylindrical section, and conical generatrix of each of the input conical section and the output conical section is perpendicular to the rotation axes. The input component is abutted against and tightly pressed on the conical surface of each input conical section and transfers the torque by means of rolling friction, the output component is abutted against and tightly pressed on the conical surface of each output conical section and transfers the torque by means of rolling friction, and the columnar cones are enabled to move axially to realize stepless gear ratio variation between the input component and the output component. The stepless transmission has the advantage that continuous variation of a contact radius between the columnar cones and each of the input component and the output component can be controlled to realize stepless transmission.

A tensioner in which sticking between a rotation member and a drive member when the tensioner is in a fully retracted state is prevented by using a simple mechanism, thereby ensuring reduced man-hour for control in assembling the tensioner and enabling the tensioner to function when it is abnormally operated. A pair of shaft members (3, 4) is threaded to each other by thread sections (8, 9), and one (3) of the shaft members (3, 4) is rotatingly urged by a spring (5) and driven by rotational force transmitted from the one shaft member (3) with the other shaft member (4) restrained from rotating. A contact section (20) is formed at that portion of the shaft members (3,4) which is other than that of the thread sections (8, 9), and the contact section (20) come into contact with the other shaft member (4) when it is moved in the direction opposite the drive direction. The contact section (20) is set to satisfy the expression of R1 / R2 < -tan(µ2 - a) / µ1, where R1 is a contact radius caused by contact, R2 the effective diameter of the thread sections (8, 9), µ1 the coefficient of friction of the contact section (20), µ2 the coefficient of friction of the thread sections (8, 9), and a the lead angle of the thread faces of the thread sections (8,9).