KINEMATIC POSSIBILITIES OF "GEARED" CLOSED ROLLING BODY SYSTEMS

In technology, mechanisms are widespread that convert rotary motion into reciprocating or oscillatory. They are most often used in combination with gearboxes. Both of these functions can be performed by one mechanism - an eccentric bearing. The article discusses the problem of studying the kinematic capabilities and rational parametric relationships of various modifications of gear eccentric bearings (EPB).

Load Capacity of Eccentric Roller Bearings

Eccentric roller bearings are commonly used in engineering and serve as actuating links in mechanical drives of various machines. Load capacity is one of the main parameters of such bearings. This paper presents possible kinematic schemes of an eccentric roller bearing and the specifics of the actual radial load distribution when it is applied to the driving ring between the rolling bodies. It is established that the load capacity of the eccentric roller bearing depends on the actual stress occurring when the rolling body of the minimal radius and the inner ring raceway are in contact. Equations are obtained for calculating the permissible radial load that the rolling body of the minimal radius with a raceway can bear. The limiting load is determined that satisfies the conditions of contact strength of the bearing’s assembly units and ensures performance of the bearing in a mechanical drive of a machine. The results of determining the limiting load of the eccentric roller bearing and the results’ analysis are presented using a specific example. To ensure the performance of the bearing, the optimal ratio of the inner ring radius to the minimum rolling body radius is determined.

PERFORMANCE INDICATORS OF ADAPTIVE FRICTION CONTACT WITH INDIRECT REGULATION

The equation of the profile curve of the slot for the rolling body of the automatic control device is obtained, this equation is used to stabilize the output parameter of the adaptive friction contact withindirect control. It is shown that the parameters of the comparison block and the additional adder are functionally dependent on the maximum coefficient of friction.

Analysis of Bearing Mechanics Characteristic of Wind Turbine

The transmission gear, bearing and hub and important component of wind field prone to fatigue failure under thermal load and alternating stress. The core component of MW class wind turbine gear box is bearing parts, according to the Betz principle bearing dynamic characteristic is analyzed including deduction and calculation of axial force and radial force, this paper simulates contact stress under the typical conditions of cylindrical roller bearing by finite element method, meanwhile analyzes the stress variation of the rolling body and a holding frame, the simulation results show that bearings bear a greater impact load in the starting process, retainer and rolling body produce large instantaneous stress value in the process, while the stress value is relatively small in the smooth operation and at braking speed, The simulation results has some practical value in engineering of optimization design.

Analysis on Stress Characteristics of Rolling Body of Rolling Dryer

Rolling dryer is one kind of dryer device with large output. The characteristic of rolling body has great influence on the output of dryer. In the paper, with the finite element method, the stress distribution of body, bolt hole, man hole and modes of rolling body are obtained by static stress and modal analysis and study of acting loads on rolling body. The results can help to enhance the efficiency of rolling dryer and provide corresponding theoretical supports for the design and manufacture of the machine.

The Series Combination of Cycloid Tooth Profile Planetary Mechanism and Screw Mechanism for Linear Drivers

A combined mechanism, which cycloid tooth profile planetary mechanism and screw mechanism are connected in series, can convert the input-component’s high-speed rotary motion to output-component’s low-speed reciprocating linear motion. Base on that mechanism, a linear drivers was developed. And it is composed by electric motor, eccentric shaft, cycloid-plate, screw & nut, and so on. Because an intermediate transmission mode used rolling-body is applied in the contact surfaces among the kinematic pairs, the drivers’ stability and transmission efficiency are enhanced through improving kinematic pairs’ friction state and reducing parts abrasion. In the paper, it is emphasis discussed that the kinematics and main parameters’ computational method for cycloid tooth profile planetary mechanism.