Hourglass Worm Gears Designed to Concentrate Surface Normals

Shimachi, Shigeyuki; Gunbara, Hiroshi; Kobayashi, Tohru; Kawada, Hiroshi

doi:10.1299/jsmec1993.37.347

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…Hourglass worm drives have multi-teeth meshing, distribution of the instantaneous contact line nearly along the tooth-height direction, larger lubrication angular, outstanding performance in carrying capacity and other prominent advantages (Shimachi et al, 1994;Wang et al, 2002;Wang et al, 2013). They are widely used in metallurgy, mining, petroleum, marine, military, and other heavy-duty transmission applications.…”

Section: Introductionmentioning

confidence: 99%

A processing method for rough cutting hourglass worm on general NC lathe

Qiu

Zhang

Zhou

et al. 2019

JAMDSM

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The manufacturing method of two spatial-orthogonal rotary axis linkage is usually used to cut hourglass worm. However, the traditional processing method of roughing tooth groove depends on the special machine, specific tool, and its processing efficiency is lower. To avoid these defects, a processing method of the rough cutting hourglass worm on general NC lathe without C-axis functions was presented in the paper. Based on the forming principle of the hourglass worm and the traditional processing steps, the machining principle of the new approach was elaborated. Key techniques such as the shape of the blade, the contours of tooth groove, tool path loop and the variable lead of worm, etc. were discussed. Macro-program of the new method was programmed based on Fanuc oi mate-tc CNC system, and tooth groove of the hourglass worm were trial manufactured on general NC lathe. Addendum axial pitch and a normal tooth thickness of the trial model were measured. It is noted that measurement results can satisfy the technological requirement. In conclusion, the new processing method of roughing hourglass worm is feasible and efficient.

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Section: Introductionmentioning

confidence: 99%

A processing method for rough cutting hourglass worm on general NC lathe

Qiu

Zhang

Zhou

et al. 2019

JAMDSM

View full text Add to dashboard Cite

show abstract

“…One of the main tasks in the determination of load distribution is to find a reliable method for the calculation of tooth stresses, lubrication characteristics, and scoring resistance of a given gear set. In [1][2][3][4][5][6] different methods were used for the calculation of tooth loading, stresses and deformation. An empirical formula for bending deflection was used in [1] to obtain a transformation matrix for calculating load.…”

Section: Introductionmentioning

confidence: 99%

“…Direct measurement of tooth loads using strain gauging under dynamic operating conditions was introduced in [3]. Another testing procedure that was devised based upon the assumption that aH contact normals of tooth surface should be at right angles to the direction of displacement, was given in [4]. The authors in [5] presented a sophisticated numerical analysis and a threedimensional simulation within an advanced CAB package to determine tooth loading.…”

Section: Introductionmentioning

confidence: 99%

Load and Stress Analysis of Cylindrical Worm Gearing Using Tooth Slicing Method

Falah

Elkholy

2006

Transactions of the Canadian Society for Mechanical Engineering

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A method for the determination of load and stress distributions of the instantaneously engaged teeth of cylindrical worm gears is represented in this paper. The method is based on the assumption that both the worm and gear can be modeled as a series of spur gear slices. The exact geometry and point of load application of each slice depends on its location within the mesh. By calculating the applied load and stress for each slice, the same can be determined for the entire worm gear set. The method takes into consideration tooth stiffness variation from root to tip, tooth bending deflection, local contact deformation, tooth foundation deformation and, the influence of gear parameters on load and stress. Calculated results were found to be in agreement with experimental and analytical ones obtained from literature under given operating conditions.

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Hourglass Worm Gears Designed to Concentrate Surface Normals

Cited by 2 publications

References 3 publications

A processing method for rough cutting hourglass worm on general NC lathe

A processing method for rough cutting hourglass worm on general NC lathe

Load and Stress Analysis of Cylindrical Worm Gearing Using Tooth Slicing Method

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