scholarly journals Displacement prediction and optimization of a non-circular planetary gear hydraulic motor

2021 ◽  
Vol 13 (11) ◽  
pp. 168781402110626
Author(s):  
Biao Zhang ◽  
Shikuan Song ◽  
Chenghu Jing ◽  
Dong Xiang
Keyword(s):  
Unit Volume ◽  
Structural Parameters ◽  
Direct Calculation ◽  
Planetary Gear ◽  
The Sun ◽  
Hydraulic Motor ◽  
Low Weight ◽  
Displacement Constraints ◽  
Pitch Curve ◽  
Wide Speed Range

The non-circular planetary gear hydraulic motor is a low-speed and high-torque hydraulic motor with excellent performance. It has the characteristics of a wide speed range, low weight and is widely used in various fields. Aiming to solve the problem of there being no intuitive formula for calculating the displacement of the non-circular planetary gear hydraulic motor at present, based on the analysis of the effects of structural parameters on the displacement of the motor, this paper proposes a formula for calculating the displacement of a non-circular planetary gear hydraulic motor when the pitch curve of the sun wheel is a high-order ellipse. The formula allows the direct calculation and prediction of the displacement of the motor. To improve the unit volume displacement of the hydraulic motor (which determines the power density of the motor), based on the analysis of the unit volume displacement constraints, an optimization equation is proposed by adding an optimization factor to the original equation of the pitch curve of the sun wheel. It is seen that the addition of the new optimization factor eliminates the self-interlacing of the pitch curve of inner ring gear. This elimination increases the unit volume displacement of the motor.

Kinematic Optimization of Transplanting Mechanism with B-Spline Curve Gear for Rice Pot Seedling Based on Matlab

2014 ◽  
Vol 624 ◽  
pp. 181-186
Author(s):  
Yan Jun Zuo ◽  
Xiao Xu Yu ◽  
Wen Ge Li ◽  
Hui Xuan Zhu ◽  
Hai Peng Ji
Keyword(s):  
Structural Parameters ◽  
Planetary Gear ◽  
Gear Train ◽  
Virtual Experiment ◽  
B Spline ◽  
Spline Curve ◽  
Data Points ◽  
Pitch Curve ◽  
Machine Interaction ◽  
Kinematic Optimization

In order to realize the mechanized transplanting of rice pot seedling and ensure our food security, The pitch curve of non-circular gear is fitted based on cubic, non-uniform and rational B-spline curve. The planetary gear train transplanting mechanism has been invented for ride type, and kinematics mathematical model has been built through the kinematics analysis of transplanting mechanism. The computer aided analytical and optimized software has been developed by using software platform of Matlab. Through tuning the data points by man-machine interaction, pitch curve of non-circular gear is optimized and structural parameters are obtained, which can meet the demand of track and attitude in the transplanting process for rice pot seedling. In condition of the parameters, the correctness of the established model is verified by the virtual experiment by software of Adams.

KHV Indexing Cam Mechanism: A New Intermittent Mechanism

2005 ◽  
Vol 219 (7) ◽  
pp. 687-694
Author(s):  
Hao Wang ◽  
Ce Zhang ◽  
Guanlong Chen
Keyword(s):  
Planetary Gear ◽  
Gear Transmission ◽  
The Sun ◽  
Boolean Operations ◽  
Cam Mechanism ◽  
New Type ◽  
Cam Profile ◽  
Pitch Curve

The KHV indexing cam mechanism is a new type intermittent mechanism that has a structure similar to the KHV planetary gear transmission (one type of the planetary drive with small teeth difference, where K indicates the sun gear, H indicates the pivoted arm, and V indicates the output mechanism). This paper focuses on the generation of a pitch curve and a cam profile in such a new mechanism. Three types of the KHV indexing cam mechanism are compared and discussed, and the equations of cam's pitch curves are derived. The cam's profile is generated by Boolean operations on the offsets of the cam's pitch curve. After this, the cusps on the cam profile are eliminated and replaced by a particular Hermite curve. The animations of all three types are illustrated, and a prototype of such mechanism is reported.

scholarly journals Design of a Noncircular Planetary Gear Mechanism for Hydraulic Motor

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Dawei Li ◽  
Yongping Liu ◽  
Jun Gong ◽  
Tongcheng Wang
Keyword(s):  
Nonlinear Programming ◽  
Programming Model ◽  
Design Method ◽  
Engineering Application ◽  
Planetary Gear ◽  
Hydraulic Motor ◽  
Nonlinear Programming Model ◽  
Gear Mechanism ◽  
Pitch Curve ◽  
Planetary Gear Mechanism

Given the design difficulty and poor accuracy of tooth profile of noncircular gear used in noncircular gear hydraulic motor, it is proposed to reduce the design difficulty and improve the design accuracy by using arc-shaped pitch curve instead of noncircular pitch curve with continuously varying curvature. Based on the geometric relationship and transmission relationship of the noncircular planetary gear mechanism, a nonlinear programming model is constructed for the circular arc-shaped pitch curve. By solving the nonlinear programming model, a noncircular planetary gear mechanism with a modulus of m = 1.5 is designed. The noncircular gear mechanism with the arc-shaped pitch curve was machined and installed in a hydraulic motor, and an efficiency comparison experiment was conducted with a high-order elliptical noncircular gear mechanism with a continuously varying curvature. The experiment shows that the efficiency of the two noncircular gear mechanisms is basically the same, and the best speed range is 100–400 rpm. The noncircular planetary gear mechanism with an arc-shaped pitch curve designed in this paper has reasonable structure, correct transmission relationship, and simple design method, which shows that the design method proposed in this paper has a good engineering application value.

The Sun and Planetary Gear Design of a 1.5-MW Wind Turbine

2018 ◽  
Vol 6 (6) ◽  
pp. 495-501 ◽  
Author(s):  
Guanjin Li ◽  
Wenyi Liu ◽  
Xiuping Su
Keyword(s):  
Wind Turbine ◽  
Planetary Gear ◽  
The Sun ◽  
Gear Design

scholarly journals Design of Vegetable Pot Seedling Pick-up Mechanism with Planetary Gear Train

2020 ◽  
Vol 33 (1) ◽  
Author(s):  
Zhipeng Tong ◽  
Gaohong Yu ◽  
Xiong Zhao ◽  
Pengfei Liu ◽  
Bingliang Ye
Keyword(s):  
Design Method ◽  
Planetary Gear ◽  
Gear Train ◽  
Dimensional Synthesis ◽  
Planetary Gear Train ◽  
Key Points ◽  
Physical Prototype ◽  
Noncircular Gears ◽  
Pitch Curve ◽  
Parameter Values

Abstract It has been challenging to design seedling pick-up mechanism based on given key points and trajectories, because it involves dimensional synthesis and rod length optimization. In this paper, the dimensional synthesis of seedling pick-up mechanism with planetary gear train was studied based on the data of given key points and the trajectory of the endpoint of seedling pick-up mechanism. Given the positions and orientations requirements of the five key points, the study first conducted a dimensional synthesis of the linkage size and center of rotation. The next steps were to select a reasonable solution and optimize the data values based on the ideal seedling trajectory. The link motion was driven by the planetary gear train of the two-stage gear. Four pitch curves of noncircular gears were obtained by calculating and distributing the transmission ratio according to the data. For the pitch curve with two convex points, the tooth profile design method of incomplete noncircular gear was applied. The seedling pick-up mechanism was tested by a virtual prototype and a physical prototype designed with the obtained parameter values. The results were consistent with the theoretical design requirements, confirming that the mechanism meets the expected requirements for picking seedlings up. This paper presents a new design method of vegetable pot seedling pick-up mechanism for an automatic vegetable transplanter.

Design of Pitch Curve of Internal-Curved Planet Gear Pump Strain in Type N-G-W Based on Three-Order Ellipse

2013 ◽  
Vol 787 ◽  
pp. 567-571
Author(s):  
Chao Wang ◽  
Zhen Hui Luan ◽  
Wei Peng Gao
Keyword(s):  
Elliptic Equation ◽  
Design Process ◽  
Planetary Gear ◽  
Gear Pump ◽  
Order Elliptic Equation ◽  
Closed Curves ◽  
Planet Gear ◽  
Gear Ring ◽  
Pitch Curve ◽  
Curve Equation

In N-G-W type non-circular planetary gear strain, the planetary gear is meshed both with the center wheel and the inner gear ring. The parameters which the design of the planetary wheel system required can be received according to the three-order elliptic equation which consist of continuous smooth closed curves as the pitch curve equation of the center wheel, and on the basis of planetary gear teeths relation, the closed condition of the pitch curve and the teeth uniformly distributed in the curve. This paper studied the design process of the pitch curve on an N-G-W type internal-curve planet gear pump by a practical example.

Investigation of Planet Gear Motion in a Planetary Gear Train With Direct High Speed Monitoring

2018 ◽  
Author(s):  
Tomoki Fukuda ◽  
Masao Nakagawa ◽  
Syota Matsui ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama
Keyword(s):  
High Speed ◽  
Planetary Gear ◽  
Gear Train ◽  
Improved Method ◽  
Lighting Conditions ◽  
Planetary Gear Trains ◽  
Low Weight ◽  
Torque Capacity ◽  
Planet Gear ◽  
Gear Trains

Planetary gear trains (PGTs) are widely applied in various machines owing to their advantages, such as compactness, low weight, and high torque capacity. However, they experience the problems of vibration due to the structural and motional complexities caused by planet gears. In a previous study, it was shown that high speed monitoring is effective for evaluating the motion of planet gears under steady conditions and transient conditions including the influence of backrush. However graphical investigation was conducted manually, and improvement in accuracy is required. In this report, an improved method is proposed, which includes lighting conditions and measurement conditions. Throughout these improvement processes, instant center of rotation is calculated automatically with detected coordinates using software. This makes it possible to estimate the transient response of PGTs with planet gear motion.

scholarly journals Dynamic analysis of planetary gear train system with double moduli and pressure angles

2018 ◽  
Vol 211 ◽  
pp. 17003
Author(s):  
Heyun Bao ◽  
Guanghu Jin ◽  
Fengxia Lu ◽  
Rupeng Zhu ◽  
Xiaozhu Zou
Keyword(s):  
Differential Equation ◽  
Integration Method ◽  
High Reliability ◽  
Planetary Gear ◽  
Gear Transmission ◽  
Gear Train ◽  
Numerical Integration Method ◽  
Planetary Gear Train ◽  
Low Weight ◽  
Train System

The planetary gear transmission with double moduli and pressure angles gearing is proposed for meeting the low weight high reliability requires. A dynamic differential equation of the NGW planetary gear train system with double and pressure angles is established. The 4-Order Runge-Kutta numerical integration method is used to solve the equations from which the result of the dynamic response is got. The dynamic load coefficients are formulated and are compared with those of the normal gear train．The double modulus planetary gear transmission is designed and manufactured. The experiment of operating and vibration are carried out and provides.

Study on a Kind of Active Balancer Using Planetary Gear Train

2014 ◽  
Vol 701-702 ◽  
pp. 761-768
Author(s):  
Ying Zhang ◽  
Chong Peng ◽  
Yu Dong Wang
Keyword(s):  
Working Conditions ◽  
Structural Parameters ◽  
Dynamic Performance ◽  
Design Procedure ◽  
Planetary Gear ◽  
Gear Train ◽  
Original Structure ◽  
Dynamic Balancing ◽  
Planetary Gear Train ◽  
Structure And Motion

A kind of active balancer using planetary gear train was developed as a solution for dynamic balancing, aiming to balance the mechanisms actively and bring little changes to their original structure and motion. It consists of a two-DOF planetary gear train and a controllable motor. One of the two inputs doubles as the output, connected to the machine to be balanced. The other input is driven by the control motor. The conceptual design of the proposed balancer was discussed. Taking one scheme as example, design procedure of the balancer was introduced. Numerical examples were given to demonstrate the effectiveness of the proposed balancer. The results showed that much more flexibility on the dynamic performance under different working conditions were achieved by selecting suitable input speed trajectories and structural parameters of the planetary gear train of the active balancer.

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