scholarly journals Numerical Model for Worm Gear Pair Inspection Based on 3D Scanned Data

2021 ◽  
Vol 20 (4) ◽  
pp. 637-648
Author(s):  
R. Masovic ◽  
T. Breski ◽  
I. Cular ◽  
K. Vuckovic ◽  
D. Zezelj
Keyword(s):  
Numerical Model ◽  
Worm Gear ◽  
Gear Pair

Computer Aided Loaded Tooth Contact Analysis in Cylindrical Worm Gears

2004 ◽  
Vol 127 (5) ◽  
pp. 973-981 ◽  
Author(s):  
Vilmos Simon
Keyword(s):  
Contact Analysis ◽  
Worm Gear ◽  
Gear Pair ◽  
Contact Lines ◽  
Tooth Contact Analysis ◽  
Tooth Contact ◽  
Computer Aided ◽  
Different Types ◽  
Worm Gears ◽  
Loaded Tooth Contact Analysis

A method for computer aided loaded tooth contact analysis in different types of cylindrical worm gears is proposed. The method covers both cases—that of the theoretical line and point contact. The geometry and kinematics of a worm gear pair based on the generation of worm gear teeth by a hob is presented. The full loaded tooth contact analysis of such a gear pair is performed. A computer program based on the theoretical background presented has been developed. By using this program the path of contact, the potential contact lines, the separations of mating surfaces along these contact lines, the load distribution and transmission errors for different types of modified and nonmodified worm gear pairs are calculated and graphically presented. The influence of gear tooth modifications on tooth contact is investigated and discussed.

A Novel Error Detection and Compensation Method of Hourglass Worm Gear Hob

2012 ◽  
Author(s):  
Q. Y. Shu ◽  
Q. Y. Qiu ◽  
P. E. Feng ◽  
L. Cao
Keyword(s):  
Mathematical Model ◽  
Error Detection ◽  
Worm Gear ◽  
Grinding Wheel ◽  
Gear Pair ◽  
Manufacturing Error ◽  
Optical Projection ◽  
Lubrication Condition ◽  
The Mathematical Model ◽  
Detecting Method

The double enveloping hourglass worm gear pair is a type of transmission, which has many traits, such as more teeth in mesh for transmission, higher contact quality, better lubrication condition and so on. Therefore, it has higher efficiency of transmission, stronger bearing capacity and longer work life. But the manufacturing difficulty of the worm gear hob has limited its popularization and application. Unlike the traditional worm gear hob which can use the principle of optical projection to detect the hob shaft section and compare with its mathematical model, currently, there is no standard mathematical model to detect the shaft section of hourglass worm gear hob. Hence, the accuracy of hourglass worm gear hob can’t be guaranteed during manufacturing process, and the accuracy of hourglass worm gear can’t be guaranteed too. Thus, the transmission performance of the manufactured double enveloping hourglass worm gear pair will be affected. The paper puts forward a novel detection method for hourglass worm gear hob on the basis of the detecting method for traditional worm gear hob and established the mathematical model of the shaft section of hourglass worm gear hob. The manufacturing error of hourglass worm gear hob can be obtained through such detection. The paper also points out that the error is mainly produced during the grinding of hob teeth, because the grinding wheel is worn out and the blank hob is thermally deformed. At last, a method for error compensation is advanced during the process of hob grinding. The paper presents a test to verify the feasibility of this method and the test result shows that the manufacturing error of hourglass worm gear hob is reduced from 30.15μm to 10.3μm.

Design and experiment of a universal space-saving end-effector for multi-task operations

2016 ◽  
Vol 43 (2) ◽  
pp. 193-203 ◽  
Author(s):  
Jun Wu ◽  
Shaowei Fan ◽  
Minghe Jin ◽  
Kui Sun ◽  
Cheng Zhou ◽  
...  
Keyword(s):  
Sensory System ◽  
Worm Gear ◽  
Gear Pair ◽  
End Effector ◽  
Content Type ◽  
Synchronous Motion ◽  
Universal Space ◽  
Space Saving ◽  
Key Factor ◽  
End Effectors

Purpose – The purpose of this paper is to present the design and experiment of a universal space-saving end-effector for multi-task operations. Design/methodology/approach – The universal end-effector is equipped with capture and actuation transmission capabilities with two corresponding subsystems, which are highly integrated systems of mechanics, electronics and sensors. A trefoil-shaped capture system is developed for closed envelop. The worm gear pair is adopted for self-locking and space-saving, and it is used in a unique manner for three grapple chains’ synchronous motion. The combination of optimal straight path linkage and pantograph mechanism is proposed in the transmission system. The electrical structure and the multi-sensory system provide the foundation for control strategy. Findings – Simulations and experiments demonstrated characteristics of the universal end-effector. The compliance of the manipulator guaranteed the achievement of “soft capture” by the end-effector. Due to the self-locking property, the end-effector and the grapple interface could keep rigid connection when powered off. Practical implications – The design process takes practical requirements into consideration. Through experiments, it is proved that the proposed end-effector can be used for the multi-task operations with corresponding tools. Originality/value – Among end-effectors with operation function, the misalignment tolerance (MT) is originally regarded as a key factor. The adoptions of the worm gear pair and the linkage make it space-saving compared to conventional designs.

The Mesh Property of the Steel Involute Cylindrical Worm with a Plastic Involute Helical Gear

2013 ◽  
Vol 30 (2) ◽  
pp. 185-192 ◽  
Author(s):  
Z. Y. Liu ◽  
C. C. Huang ◽  
Y. H. Hao ◽  
C. C. Lin
Keyword(s):  
Finite Element ◽  
Helical Gear ◽  
Worm Gear ◽  
Gear Pair ◽  
Conventional Steel ◽  
Element Simulation ◽  
Discrete Dynamic Model ◽  
Plastic Gears ◽  
Plastic Steel ◽  
Geometry And Kinematics

ABSTRACTWith the increasing use of plastic gears in substitution of conventional steel ones, a plastic involute helical gear has been introduced to engage with a steel involute worm thus forming a novel plastic-steel worm-gear pair. The geometry and kinematics of this kind of worm-gear pair has been established first to derive its meshing properties which have been further verified by the finite element simulation. And it turns out that the contact area of this worm-gear pair is a point or an ellipse instead of a line. Further, a discrete dynamic model has been applied to investigate the dynamic transmission of motion and power of this worm-gear pair through the dynamic mesh force and the driven plastic involute helical gear. And the effects of angular and distance assembling errors have also been included.

Research and Development of Large-Scale Worm Gear Pair Tester Based on Time Grating Displacement Sensor

2013 ◽  
Vol 325-326 ◽  
pp. 730-733
Author(s):  
Yong Zheng ◽  
Yan Chen ◽  
Zi Ran Chen
Keyword(s):  
Research And Development ◽  
Large Scale ◽  
Transmission Error ◽  
Worm Gear ◽  
Displacement Sensor ◽  
Mechanical Equipment ◽  
Gear Pair ◽  
Nios Ii ◽  
Hardware System ◽  
Multi Stage

With a good many advantages, the worm and gear has been widely used in mechanical equipment. To realize transmission error (TE) detection of worm gear pair is important for the comprehensive detection of large worm gear pair. The tester adopts time-grating displacement sensor as angle feedback sensor, and the multi-stage clock interpolation principle is applied for TE collection. In order to facilitate hardware system integrating and upgrading, the FPGA with NIOS II is used for realizing microcontroller.

Computer Aided Tooth Contact Analysis in Cylindrical Worm Gears

2003 ◽  
Author(s):  
Vilmos V. Simon
Keyword(s):  
Contact Analysis ◽  
Worm Gear ◽  
Gear Pair ◽  
Contact Lines ◽  
Tooth Contact Analysis ◽  
Tooth Contact ◽  
Computer Aided ◽  
Different Types ◽  
Worm Gears ◽  
Loaded Tooth Contact Analysis

A method for computer aided loaded tooth contact analysis in different types of cylindrical worm gears is proposed. The method covers both cases — that of the theoretical line and point contact. The geometry and kinematics of a worm gear pair based on the generation of worm gear teeth by a hob is presented. The full loaded tooth contact analysis of such a gear pair is performed. A computer program based on the theoretical background presented, has been developed. By using this program the path of contact, the potential contact lines, the separations of mating surfaces along these contact lines, the load distribution and transmission errors for different types of modified and non-modified worm gear pairs are calculated and graphically presented. The influence of gear tooth modifications on tooth contact is investigated and discussed.

Study on the Strength Design for Steel Hourglass Worm Pairs of Track Tension Adjustor on Special Vehicles

2012 ◽  
Vol 591-593 ◽  
pp. 136-139
Author(s):  
Zhu Jun Li ◽  
Yong Yang
Keyword(s):  
Carrying Capacity ◽  
Design Method ◽  
Worm Gear ◽  
Tooth Surface ◽  
Gear Pair ◽  
Tin Bronze ◽  
Strength Design ◽  
Manual Adjustment ◽  
The Difference ◽  
Center Distance

This study analyzed the difference between the steel worm gear in the worm type track regulator and the commonly power hourglass worm. And a strength design method of steel worm gear pair in the track regulator was presented based on the design method of hourglass worm gear: According to the condition of manual adjustment, the strength design of the worm gear pair worm material is tin bronze material , select primary center distance a1, And then according to the difference on the carrying capacity the steel worm gear and tin-bronze worm gear, correct primary center distance a1, Finally check the contact strength of tooth surface when locking condition.

Effects of Tooth Profiles and Addendum Modification on Efficiency of Cylindrical Worm Gears

2000 ◽  
Author(s):  
Hidehiro Yoshino ◽  
Fumihiro Ohshima
Keyword(s):  
Power Transmission ◽  
Film Formation ◽  
Tooth Profile ◽  
Worm Gear ◽  
Gear Pair ◽  
Oil Film ◽  
Worm Gears

Abstract Power transmission efficiencies of five cylindrical worm gear pairs with different profiles and different addendum modifications were measured. The convex, concave or trapezoid profile and also the positive, negative or zero addendum modification was given to each gear pair. The efficiency of worm gears does not change if only the tooth profile is changed. However, it changes (increases) when the change in the profile and the addendum modification were combined. For example, the efficiency of worm gears with the convex tooth and the negative addendum modification increased by 3% to 91% and that of with the concave tooth and the positive modification increased by 4% to 91.5%. The reason why the efficiency increases is investigated and discussed by analyzing the meshing and lubricating conditions between the meshing teeth. As a result, it will be shown that the efficiency of worm gears is strongly influenced by the condition of oil film formation between the teeth.

Sign in / Sign up

Export Citation Format

Share Document