scholarly journals The General Kinematic Pair of a Cam Mechanism

2019 ◽  
Author(s):  
Jiří Ondrášek
Keyword(s):  
Kinematic Pair ◽  
Cam Mechanism

Thermal Elastohydrodynamic Lubrication of an Optimized Cam–Tappet Pair in Smooth Contact

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
W. Wu ◽  
J. Wang ◽  
C. H. Venner
Keyword(s):  
Film Thickness ◽  
Elastohydrodynamic Lubrication ◽  
Temperature Profiles ◽  
Cam Mechanism ◽  
Basic Segment ◽  
Order Polynomial ◽  
Isothermal Analysis ◽  
Base Circle ◽  
Smooth Contact ◽  
Oil Characteristics

A high-order polynomial gas distribution cam mechanism is investigated theoretically from the viewpoint of thermal elastohydrodynamic lubrication (EHL). First, a cam with a larger base circle radius is employed, which results in slide–roll ratio 2.0 < S < 9.0 when the two surfaces move oppositely. The pressure, film thickness, and temperature profiles at a number of angular positions of the cam are presented, together with the isothermal results. The comparison between thermal and isothermal oil characteristics is also shown. It is revealed that the isothermal analysis partly overestimates the actual film thickness and it also misses some essential local phenomena. Second, a cam with a smaller base circle radius is studied, which leads to drastic variations in the slide–roll ratio which encounters four times’ occurrences of infinity in one working period. The pressure, film thickness, and temperature profiles at some angular cam positions together with the oil characteristics are given, showing much dramatic variations. A very small film thickness is observed at the contact of the tappet with the start of the cam basic segment, which suggests a possible risk of direct contact of both surfaces.

Mechanical Analysis of Disc Cam Mechanisms with Negative Radius Roller Translating Follower

2012 ◽  
Vol 184-185 ◽  
pp. 301-306
Author(s):  
Rong Fu Lin ◽  
Yong Chang
Keyword(s):  
Contact Stress ◽  
Mechanical Analysis ◽  
Cam Mechanism

This paper proposes the conditions of no-undercutting and contact-retaining of the disc cam mechanism with negative radius roller follower. Then, it presents the contact stress expression based on the mechanical analysis. In addition, the effects of different parameters on the force and contact stress are analysed. The results show that the contact stress can be reduced by designing the suitable parameters of the cam.

scholarly journals Study on High-Speed Intermittent Motion Mechanism. Comparison Indexing Cam Mechanism with Servo-System.

2002 ◽  
Vol 68 (668) ◽  
pp. 1191-1197
Author(s):  
Masatoshi HIKIZU ◽  
Hiroaki SEKI ◽  
Yoshitsugu KAMIYA ◽  
Hiroshi TACHIYA ◽  
Hisanao NOMURA
Keyword(s):  
High Speed ◽  
Servo System ◽  
Motion Mechanism ◽  
Cam Mechanism ◽  
Intermittent Motion

Synthesis of the internal parallel cam mechanism

1998 ◽  
Vol 212 (7) ◽  
pp. 577-585 ◽  
Author(s):  
M Nishioka ◽  
T Nishimura
Keyword(s):  
Parametric Analysis ◽  
Parallel Mechanism ◽  
Design Parameters ◽  
Cam Mechanism ◽  
Pressure Angle

Parallel cam mechanisms have been studied in different ways. In this paper, a parametric formulation which can cover every configuration of the parallel cam mechanism is derived. As a result of parametric analysis, a new, last mechanism was found. This cam is essentially an internal cam mechanism. Based on the assumption of an equally distributed roller follower, the basic configurations of the mechanism are derived from both the pressure angle and the undercutting constraints. As a result, the possible number of rollers per spider plate is two. Thus the feasible area of the design parameters of the mechanisms are obtained. The advantages of the mechanism over the conventional parallel mechanism are the saving of space and a larger angular stroke of output.

Dynamic Analysis of the Pipe Lifting Mechanism on the Deepwater Pipelaying Vessel

2011 ◽  
Vol 199-200 ◽  
pp. 251-256
Author(s):  
Kai An Yu ◽  
Ke Yu Chen
Keyword(s):  
Numerical Analysis ◽  
Dynamic Analysis ◽  
High Efficiency ◽  
Transport Systems ◽  
Kinematic Pair ◽  
Analysis Method ◽  
Numerical Analysis Method ◽  
Upper Limit ◽  
Lifting Capacity ◽  
Limit Position

Based on requirements of pipe transport systems on deepwater pipelaying vessel, a new pipe lifting mechanism was designed. It was composed of crank-rocker and rocker-slider mechanism with good lifting capacity and high efficiency. When the slider went to the upper limit position, the mechanism could approximatively dwell, meeting the requirement for transverse conveyor operation. According to the theory of dynamics, numerical analysis method was used to the dynamic analysis of the mechanism. The results showed the maximum counterforce was at the joint between the rocker and ground, and this calculation could be a guideline for the kinematic pair structure designing.

Research and Application on a Multi Head Conjugate Disc Indexing Cam Mechanism

2012 ◽  
Vol 184-185 ◽  
pp. 384-388
Author(s):  
Bing Tian Gao
Keyword(s):  
High Speed ◽  
Production Efficiency ◽  
High Reliability ◽  
Low Cost ◽  
Domestic Industry ◽  
Cam Mechanism ◽  
Technical Performance ◽  
Working Performance ◽  
Research Achievement ◽  
Indexing Mechanism

In order to realize the technical performance of high speed, high precision, high stability and high reliability for conjugated indexing mechanism with periodic intermittent rotary motion, a two cams structure has been designed, and its geometry size and profile curve was carefully determined. Also the calculation formula of the contour curve for CAM was deduced. Research achievement has been applied to new equipment of enterprise development, the working performance is stable and reliable, the production efficiency raised by 30% compared to the domestic industry. The mechanism has characteristics of simplified structure, improved transmission performance and low cost.

Globoidal Indexing Cam’s CAD/CAM Development on Pro/E

2011 ◽  
Vol 86 ◽  
pp. 496-499 ◽  
Author(s):  
Nian Fu Xu ◽  
Feng Xu ◽  
Wei He
Keyword(s):  
Main Idea ◽  
Cam Mechanism ◽  
Cad Cam ◽  
Data Points ◽  
Design And Manufacture ◽  
Further Development

Because of the design and manufacture of the globoidal indexing cam mechanism is very difficult, this paper developed a globoidal indexing cam CAD/CAM system by using Pro/ Engineer’s further development module Pro/Toolkit, which can simplify the process of designing the globoidal indexing cam. The main idea is that designing cam by parameters and generating the data points of the indexing cam automatically by the computer.

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