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.

The invention discloses a method for utilizing a virtual material to perform equivalence of dynamic characteristic of a bolting joint part. The bolting joint part is regarded as a plurality of virtual material layers, a finite element method is utilized to simulate stress conditions of different of bolting joint part at the contact areas under different bolt pretightening forces, and the contact pressure distribution of the bolting joint part is equivalent to be a fourth-order polynomial function with respect to the contact radius; an equivalent virtual material model of the bolting joint part is established by utilizing material mechanics knowledge, to determine a function relationship between the contact radius in an effective contact area and virtual material properties (elastic modulus, shear modulus, Poisson's ratio, density and virtual layer thickness); by the finite element method, two-layer, three-layer or more-layer virtual materials coupled with each substructure to establish a finite element model of the whole structure, and dynamic response analysis is performed, an obtained frequency response function is compared with modal test data to verify the correctness of the model, and the novel idea and method are provided for studying the dynamic characteristics of the bolting joint part.

The invention discloses a method for measuring the surface adhesive capacity and an elastic modulus of a soft material, the method comprises the following specific steps of: (1) preparing a sample and selecting a probe according the physical property and the chemical property of a tested sample; (2) controlling a horizontal substrate and the spherical probe to move oppositely to be contacted and separated at a constant speed; (3) measuring an interaction force P, a relative displacement delta and a contact radius a respectively by using a pressure sensor, a displacement sensor and an optical microscope in the whole process of the step (2) when the substrate and the probe are contacted with each other; (4) frequently repeating the steps (2) and (3) under the control of software; and (5) quantitatively analyzing the adhesive capacity and the elastic performance of the tested material by using data obtained in the step (3) according to a jabatan kerja raya (JKR) theory. The measurement method has giant application potential in the aspects of scientific research on soft materials such as high-molecule elastic body, biogel and the like, product quality control in industrial manufacturing processes and the like.

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.

The invention provides an automobile stepless speed change device. A friction drive mechanism of the automobile stepless speed change device is composed of a driving gear, three driven gears, three branch friction discs, a main friction disc and a compression spring. The driving gear is coaxially connected with a main shaft of an engine. The driven gears are meshed with the driving gear. The branch friction discs are arranged on a driven gear shaft and drive the main friction disc and the compression spring through idler wheels. A rotating shaft of the main friction disc is connected with a rear axle of an automobile. A speed regulation mechanism is composed of an idler wheel defining disc and an idler wheel synchronous stirring disc which are located between the branch friction discs and the main friction disc. A speed regulation motor drives the idler wheel synchronous stirring disc to rotate through a speed regulation gear. The idler wheel synchronous stirring disc drives the three idler wheels to synchronously move in the radial direction through spiral sliding grooves, idler wheel pull rods and idler wheel sliding blocks, and therefore the contact radius between the idler wheels and the branch friction discs and between the idler wheels and the main friction disc are continuously changed, and stepless speed change is achieved. The automobile stepless speed change device is simple in structure, low in cost, balanced in stress, high in power delivery efficiency, large in gear ratio range, small in occupied space and capable of being integrated with a clutch.

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([mu]2 - alpha)/[mu]1, where R1 is a contact radius caused by contact, R2 is the effective diameter of the thread sections (8, 9), [mu]1 is the coefficient of friction of the contact section (20), [mu]2 is the coefficient of friction of the thread sections (8, 9), and alpha is the lead angle of the thread faces of the thread sections (8,9).

A strut joint of a truss features a contact trough on an inner chord face being in an area contact with a rotationally symmetric strut end surface having a contact radius of at least half a strut height. The rotation axis of the strut end surface and the trough is substantially perpendicular to the struts protrusion direction and the chord's protrusion direction. The area contact provides for snug contact irrespective deviations from a predetermined strut joint angle between strut end and chord. An optional interposing structure may extend the area contact in between two opposite strut end surfaces of a single strut joint.

The invention discloses a characterization method of mechanical properties of an elastic-plastic graded modification layer on a metal surface and belongs to the field of characterization of properties of modification layers on metal surfaces. According to the method, a plasma surface alloying method is adopted for a polished metal base material, infiltration elements are selected reasonably, and the elastic-plastic graded modification layer is formed on the surface of the polished metal base material. Butt bonding, sample inlaying and polishing treatment are performed on cut and prepared sample cross sections. The modification layer is divided into multiple sub-layers according to the thickness of the modification layer and the indentation contact radius for a nano-indentation test. Inverse analysis calculation is performed on a load-displacement curve obtained through test of each sub-layer with ANSYS v10.0 finite element software, and the elastic-plastic property parameter of each sub-layer is obtained. Mechanical property parameters of all the sub-layers are numerically fitted, so that mechanical property parameters of all points in the thickness direction of the elastic-plastic graded modification layer on the metal surface are obtained quantitatively. The method is easy to operate, besides, the matrix effect is eliminated, and the result is accurate and reliable.

The invention relates to a data processing method for the prediction of a multilevel threshold force caused by composite impact, which comprises the following steps: 1) carrying out an impact experiment on the composite laminated board serving as a reference experiment component so as to obtain a multilevel threshold force of the composite laminated board, wherein the thickness of the composite laminated board is regarded as an infinite thickness; and 2) calculating multilevel threshold forces of laminated boards which are different in thickness and belongs to a same material system under the action of impact heads with different radiuses by using the obtained multilevel threshold force. Compared with the prior art, according to the invention, the influence of the deflection of plate on the contact radius is considered in data processing, and therefore, the method has an advantage of high prediction precision.

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.

The invention relates to contact resonance frequency signal analysis of an atomic force microscope, in particular to a finite element simulation method for probe-sample contact resonance. The finite element simulation method for probe-sample contact resonance comprises the following steps: establishing a probe free resonance finite element model, and using an experiment free resonance result to fit and optimize the geometric dimension of a probe; establishing probe-sample contact resonance finite element model, determining the inclination angle of the probe, the contact radius and the sample material attribute. According to the contact resonance finite element modeling method, contact resonance frequency signals of different samples and different types of probes are output by taking an atomic force microscope experiment principle as a requirement, high-order contact resonance frequency is calibrated, vibration modes of different-order resonance are judged, and the influence of different material attributes on resonance frequency drift is quantified; powerful discrimination is provided for interference signals, false signals and noise coverage in an AFM experiment; and meanwhile, guidance of probe design is provided for designers.

The invention provides a temperature calculation method and device, and relates to the technical field of electric power, and the method comprises the steps of carrying out the calculation based on the thermal expansion coefficient of a conductor, and obtaining the radius variation of the contact radius of the conductor; determining the actual contact radius of the conductor according to the initial contact radius and the radius variation of the conductor; and calculating the temperature of the contact area according to the actual contact radius and a temperature model preset for the contact area, the temperature model being used for indicating the temperature characteristic of the contact area; calculating the radius variation of the contact radius of the conductor based on the thermal expansion coefficient of the conductor; and using the radius variation for the temperature calculation of the contact area of the conductor, so that the influence of the thermal expansion factor of thecontact area is introduced into the temperature calculation result, the temperature of the contact area can be calculated more accurately under the condition that the temperature of the contact area is changed, and the accuracy of determining the temperature of the contact area is improved.