scholarly journals A New Type of Low Speed High Torque Hydraulic Motor with Continuously Variable Displacement

2005 ◽  
Vol 2005 (6) ◽  
pp. 717-721
Author(s):  
Yong Li ◽  
Guanglin Shi ◽  
Zhaoneng Chen
Keyword(s):  
Hydraulic Motor ◽  
Low Speed ◽  
Variable Displacement ◽  
New Type ◽  
High Torque

Kinematics Analysis of the New Type of Offset Radial Piston Motor

2014 ◽  
Vol 889-890 ◽  
pp. 463-466
Author(s):  
Sheng Mei Luo ◽  
Wei Liu ◽  
Fu Fang Luo ◽  
Wei Wei Yu ◽  
Zhi Hong Ma
Keyword(s):  
Hydraulic System ◽  
Pure Water ◽  
Low Noise ◽  
Hydraulic Motor ◽  
General Motor ◽  
Low Speed ◽  
Structural Principle ◽  
New Type ◽  
Type Motor ◽  
Startup Performance

This paper introduces the structural principle of a new offset radial type motor. Through analyzing the kinematic characteristics of the motor piston theory, the result shows that the motor has characteristics of good startup performance at low speed, good sliding performance with sliding boots, smooth operation, low noise and so on, so the performance is superior to the general motor of low speed and high torque. Besides, comparing with other types of hydraulic motor, its lifetime increases and it is also easier to produce and repair. Moreover, beside the use of common hydraulic system, it can also be used in pure water hydraulic system under certain conditions.

Theoretical and experimental studies on the steady-state performance of low-speed high-torque hydrostatic drives. Part 1: Modelling

2009 ◽  
Vol 223 (11) ◽  
pp. 2663-2674 ◽  
Author(s):  
S K Mandal ◽  
K Dasgupta ◽  
S Pan ◽  
A Chattopadhyay
Keyword(s):  
Steady State ◽  
Experimental Studies ◽  
Open Circuit ◽  
State Variables ◽  
Hydraulic Motor ◽  
Low Speed ◽  
Compression And Expansion ◽  
Loss Coefficients ◽  
High Torque ◽  
State Models

In this article the steady-state models of an open-circuit and a closed-circuit hydrostatic transmission (HST) drive have been developed to study their performances. A low-speed high-torque multi-stroke cam plate type radial piston motor is considered for both HST drives. Bondgraph simulation technique has been used to model the drives. The multi-bondgraph representation of the HST drives is presented; it takes into account the compression and expansion phases, which occur sequentially in the hydraulic motor. A reduced bondgraph model of the drives has been proposed, where various losses are lumped into suitable resistive elements. The relationships of the loss coefficients with other state variables, obtained from the reduced model, are identified through experimental investigation. The loss coefficients are found to have a non-linear relationship with the load torque and the supply flowrate. Using the characteristics of these loss coefficients, the steady-state performances of the hydrostatic drives are studied in Part 2 of this article (pg. 2675 of this issue).

scholarly journals Distribution Performance Analysis and Experimental Research on the Port Plate Pairs of Low Speed High Torque Seawater Hydraulic Motor

2019 ◽  
Vol 32 (1) ◽  
Author(s):  
Zhiqiang Wang ◽  
Shaofeng Wu ◽  
Dianrong Gao ◽  
Shuncai Wang
Keyword(s):  
Friction And Wear ◽  
Flow Distribution ◽  
Test System ◽  
Inlet Pressure ◽  
Leakage Flow ◽  
Distribution Characteristics ◽  
Hydraulic Motor ◽  
Low Speed ◽  
Rotating Speed ◽  
High Torque

AbstractThe current research of seawater hydraulic motor mainly focused on piston motor and vane motor, but seldom regarded low speed high torque seawater hydraulic motor. Low speed high torque seawater hydraulic motor as a kind of energy conversion device and actuator plays an important role in seawater hydraulic transmission system. However, the physical and chemical properties of seawater, such as low viscosity, high causticity and poor lubrication, result in numerous problems. In this paper, the flow distribution characteristics of port plate pairs for the seawater hydraulic motor are investigated, and the leakage flow and power loss models of port plate pairs are established. Numerical simulations are carried out to examine the effects of water film, inlet pressure and rotating speed on the pressure distribution and leakage flow. And the friction and wear tests of port plate pairs are also carried out. Moreover, the test system of the seawater hydraulic motor is constructed and the performance of prototype with no-load or loading is conducted. The results indicate that the clearance of port plate pairs and inlet pressure have a significant effect on distribution characteristics, but the effect of rotating speed is not very obvious. The experimental results show that the minimum error rate can be maintained within 0.3% by the proposed flow model and the counter materials of 316L against carbon-fiber-reinforced polyetheretherketone (CFRPEEK) are suitable for the port plate pairs of seawater hydraulic motor. Finally, based on the seawater hydraulic experiment platform, the volumetric efficiency of no-load and loading are obtained that the maximum can achieve 94.71% and 90.14%, respectively. This research work may improve the flow distribution performance, lubrication and the friction and wear properties, enhance energy converting efficiency of port plate pair and provide theoretical and technical support for the design of high-performance water hydraulic components.

scholarly journals Experimental Validation of Subsystem Models for a Novel Variable Displacement Hydraulic Motor

2021 ◽  
Author(s):  
Jacob Larson ◽  
Jonatan Pozo-Palacios ◽  
Grey Boyce-Erickson ◽  
Nathaniel Fulbright ◽  
Jaichen Dai ◽  
...  
Keyword(s):  
Mechanical Energy ◽  
Experimental Tests ◽  
Pressure Differential ◽  
Main Shaft ◽  
Hydraulic Motor ◽  
Single Cylinder ◽  
Variable Displacement ◽  
High Torque ◽  
Low Torque ◽  
Assembly Procedure

Abstract A novel, variable displacement, low-speed high-torque hydraulic motor is being developed that is expected to be highly efficient across a broad operating range. To ensure the final hardware achieves the expected performance, the models used in the development of the motor must be experimentally validated and revised. The focus of this work is on mechanical energy loss models that were used to guide the design of a single-cylinder motor prototype and then experimental tests used for validation. Losses were modeled and organized into five primary groups: main shaft bearings, main shaft seal, case windage, valve actuation, and linkage losses. The single-cylinder prototype was fabricated, and test parameters were defined. Two test rigs were designed and built to capture losses of the motor experimentally; one was used to collect low torque, zero/low-pressure differential results, and the other used to collect high torque, high-pressure differential results. A staged assembly procedure was developed to capture the independent contributions of each loss. By reviewing the quality of correlation between test observations and model predictions and revising the model when necessary, the models were validated. The correlation was improved by reviewing and modifying model inputs. This allows future solutions to be more accurately predicted in the design phase to drive the design of better machines. The validated model package was able to predict the motor performance within an acceptable range of error.

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