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Performance of a Cam-Type Pulse Continuously Variable Transmission

Pabiszczak Stanisław

Advances in Science and Technology. Research Journal

2024

Vol. 18, no 1

280--290

The aim of this paper is to assess the performance parameters of the cam-type pulse Continuously Variable Transmission, which is a first attempt to investigate this issue in the presented manner. The transmission under investigation comprises two cams in cooperation with two units, each consisting of rollers connected to swing rods mounted on overrunning clutches. To accomplish this, a test stand was built and a detailed testing program was developed takes into consideration the influence of gear ratio, rotational speed, and load on the uniformity of motion and efficiency. Analysis of the obtained results leads to the conclusion that the tested CVT is particularly sensitive to changes in operating conditions, and its overall performance deteriorates as the reduction ratio increases. The best results were achieved with a load below the nominal one, at low rotational speeds and a low speed reduction. The transmission’s structure design and operational principle result in significant power losses, as evidenced by an efficiency rating of less than 60%.

A new approach for control the velocity of the hydrostatic system for scissor lift with fixed displacement pump

Stawinski Lukasz, Kosucki Andrzej, Morawiec Adrian, Sikora Malgorzata

Archives of Civil and Mechanical Engineering

2019

Vol. 19, no. 4

1104--1115

The article describes a new approach to the issue of controlling hydrostatic systems with fixed displacement pump using the frequency inverter and the simple controller unit. The aim of the article is to present a method of controlling the velocity of scissor lift drive to provide a constant velocity of the platform, regardless of its load, geometry and current location. The main feature of the proposed solution is the use of feedback in the quasi open loop from platform displacement sensor to the velocity control system of the electric motor. To ensure theThere is a possibility of using the proposed control system in a typical hydrostatic scissor lift, with added only an inverter, a platform displacement sensor and a controller to an existing machine. The proposed control strategy has been verified experimentally on an existing drive, and the obtained results show satisfactory mileages and very high accuracy of maintaining and shaping the platform velocity. The developed mathematical and physical models of the whole drive has been verified on the test bench. The conducted research gives information about new possibilities of using the inverter in hydrostatic systems, such as increasing efficiency, decreasing acceleration, decelerations , damping and improve the safety of the operation.