Analysis of Wear Processes of Polyamide Worm Wheel Gear Rims

2021 ◽  
Author(s):  
V. I. Molchanov
Keyword(s):  
Worm Wheel

scholarly journals Worm gear efficiency model considering misalignment in electric power steering systems

2018 ◽  
Vol 9 (1) ◽  
pp. 201-210 ◽  
Author(s):  
Seong Han Kim
Keyword(s):  
Electric Power ◽  
Normal Load ◽  
Contact Point ◽  
Normal Pressure ◽  
Worm Gear ◽  
Electric Power Steering ◽  
Friction Coefficients ◽  
Power Steering ◽  
Worm Wheel ◽  
Gear Efficiency

Abstract. This study proposes a worm gear efficiency model considering misalignment in electric power steering systems. A worm gear is used in Column type Electric Power Steering (C-EPS) systems and an Anti-Rattle Spring (ARS) is employed in C-EPS systems in order to prevent rattling when the vehicle goes on a bumpy road. This ARS plays a role of preventing rattling by applying preload to one end of the worm shaft but it also generates undesirable friction by causing misalignment of the worm shaft. In order to propose the worm gear efficiency model considering misalignment, geometrical and tribological analyses were performed in this study. For geometrical analysis, normal load on gear teeth was calculated using output torque, pitch diameter of worm wheel, lead angle and normal pressure angle and this normal load was converted to normal pressure at the contact point. Contact points between the tooth flanks of the worm and worm wheel were obtained by mathematically analyzing the geometry, and Hertz's theory was employed in order to calculate contact area at the contact point. Finally, misalignment by an ARS was also considered into the geometry. Friction coefficients between the tooth flanks were also researched in this study. A pin-on-disk type tribometer was set up to measure friction coefficients and friction coefficients at all conditions were measured by the tribometer. In order to validate the worm gear efficiency model, a worm gear was prepared and the efficiency of the worm gear was predicted by the model. As the final procedure of the study, a worm gear efficiency measurement system was set and the efficiency of the worm gear was measured and the results were compared with the predicted results. The efficiency considering misalignment gives more accurate results than the efficiency without misalignment.

scholarly journals Module and functionally-oriented techniques in designing and manufacturing worm gears

2017 ◽  
Vol 2 (3) ◽  
pp. 37-44
Author(s):  
Сергей Лагутин ◽  
Sergey Lagutin ◽  
Александр Сандлер ◽  
Aleksandr Sandler ◽  
Евгений Гудов ◽  
...  
Keyword(s):  
Machine Tools ◽  
Mechanical Engineering ◽  
Cutting Tool ◽  
Theory And Practice ◽  
Training Manual ◽  
Worm Wheel ◽  
Production Experience ◽  
Worm Gears ◽  
And Performance ◽  
Required Quality

Worm gears of different purposes and dimensions belong to those objects of mechanical engineering which are connected with science intensive design works (computations and development of design arrangements) and with their not less science intensive technological realization in the course of production. In 2016 the authors published a training manual “Theory and practice of general worm gears production” (M. Infra-Engineering, 2016. – pp. 346) where there is generalized a scientific-production experience of enterprises of mechanical engineering and machine tools manufacture for the formation of the complex of modular and functionally-oriented technologies ensuring required quality and performance characteristics of such objects. As a distinctive feature of such a complex is the interconnection of design and production processes of gear basic parts: a worm, a worm wheel with similar processes in the formation of a producing surface in a gear-cutting tool for a worm wheel.

Optimal design for an end face engagement worm gear with multiple worm-wheel meshing

2017 ◽  
Vol 30 (1) ◽  
pp. 144-151 ◽  
Author(s):  
Xingqiao Deng ◽  
Weibing Zhu ◽  
Yonghong Chen ◽  
Shouan Chen ◽  
Jinge Wang
Keyword(s):  
Optimal Design ◽  
Worm Gear ◽  
Worm Wheel

Calculation of the Digital Prototype for Modification of the Initial Straight Profile to the Form of the Tooth-Cutting Tool’s Producing Surface

2021 ◽  
pp. 35-46
Author(s):  
S. Ryazanov ◽  
M. Reshetnikov
Keyword(s):  
Cutting Tool ◽  
Worm Gear ◽  
Geometric Parameters ◽  
Kinematic Chains ◽  
Gear Cutting ◽  
Working Surface ◽  
Worm Wheel ◽  
Worm Gearing ◽  
Worm Gears ◽  
High Level

Spatial helical gears, worm gears with a cylindrical worm, globoid gears, etc., are widely used in most of modern engineering products [1-3; 37; 42]. Cylindrical worm gears are actively used in the creation of metalworking equipment (push mechanisms of rolling mills, presses, etc.), in lifting and transport machines, in drives and kinematic chains of various machine tool equipment where high kinematic accuracy is required (dividing machine tools, adjustment mechanisms), etc. In a worm gear a cylindrical worm or its cylindrical helical surface can be cut by various technological methods [49-51], but no matter how the shaping of the worm gear elements’ working surfaces is carried out, the worm wheel is cut with a gear cutting tool, whose producing surface coincides with the worm thread’s lateral surface [19; 22; 23]. In this regard, the working surface of the cylindrical worm wheel’s tooth, even with a non-orthogonal arrangement of axes, is an envelope of a one-parameter family of surfaces that gives a linear contact, which presence makes it possible to transfer a large load using a worm gear. For high-quality manufacturing of worm gears, it is necessary to design and manufacture a productive gear cutting tool - an accurate worm cutter, whose shaping (working) surface must be identical to the profiled worm’s shaping (working) surface [24-27; 54]. One of the most important tasks in the implementation of worm gearing is the problem of jamming of the cylindrical worm and the worm wheel’ contacting surfaces. This problem is excluded by relieving the contacting surfaces’ profile along the contact line. Considering that any violations of contacting surfaces’ geometric parameters affect the change in their geometric characteristics, the tasks of accurately determining the adjustment parameters of the technological equipment, used for shaping the worm and worm wheel, enter into in the foreground of the worm gearing elements production. In modern conditions of plant and equipment obsolescence, and in particular, of gear cutting machines used for worm gears manufacture, these machines physical wear, implies an inevitable decrease in the accuracy of their kinematic chains. Therefore, in order to maintain the produced gears’ quality at a sufficiently high level, it is necessary to use deliberate modification of contacting surfaces when calculating the worm gearing’s geometric parameters; such modification reduces the worm gear sensitivity to manufacturing and mounting errors of its elements [28-31].

The Production of Small Worm Gears for Experimental Work

1947 ◽  
Vol 156 (1) ◽  
pp. 368-372
Author(s):  
A. M. Gunner
Keyword(s):  
Experimental Work ◽  
Research Laboratory ◽  
Single Point ◽  
General Rule ◽  
Worm Gear ◽  
Pressure Angle ◽  
Worm Wheel ◽  
Worm Gears ◽  
Shaft Angle ◽  
Gear Drives

Small worm gear drives are a common feature in the design of many types of apparatus, and the following description of the methods used for producing them in an experimental establishment may be of interest. Quantities are small, one or two to each pattern being the general rule, but there is certainly no lack of variety. The worms and wheels most often called for range in size up to 1½ inches and 6 inches diameter respectively, while pitches vary from 10 to 60 d.p. (diametral pitch). Addendum and dedendum proportions of 1/ PN and 1·25/ PN have been standardized, and a pressure angle of 20 deg. is adopted throughout. The gears are designed as hollow-faced helical (spiral) gears, and all calculations are based on the normal pitch. This is to enable standard hobs and cutters to be used for the worms. The shaft angle is usually 90 deg., but the angle of crossing may be varied up to 10 deg. either way on the particular machine employed for cutting the wheels. For many applications, backlash must be reduced to the very minimum consistent with smooth running; and to avoid the extreme accuracy of workmanship which an exact centre distance would necessitate, provision is usually made for adjustment of the worm. Although the Reinecker tangential feed method of worm wheel generation by a single-point tool —representing one tooth of a hob—is generally known, very little information on cutter forming is available. The method outlined was developed at the Admiralty Research Laboratory. Given the use of a modern worm grinder (not available), it should be possible to profile-relief grind these cutters after hardening.

The Motion Control of Clothes Model Robot and Measurement of Clothes Energy Consumption

2011 ◽  
Vol 301-303 ◽  
pp. 153-157
Author(s):  
Xiu Wu Sui ◽  
Xiao Guang Qi ◽  
Han Wang Zhao ◽  
Da Peng Li ◽  
Ya Ming Jiang
Keyword(s):  
Energy Consumption ◽  
Motion Control ◽  
Measurement System ◽  
Evaluation System ◽  
Rotation Speed ◽  
Dc Motor ◽  
Worm Wheel ◽  
Robot Technology ◽  
Power And Energy

This paper designs a measurement system of energy consumption for clothes model controlled by robot technology, the system uses DC motor regulated by PWM regulator to drive the worm wheel reducer and the sinusoidal mechanism, then to drive the robot legs to swing forward and backward in sinusoidal step. The sensors detect the rotation speed and torque of the sinusoidal mechanism, the power and energy consumption. The experiments show the system is high in accuracy, excellent in repetition, and suitable for the further research on the principle and evaluation system of the clothes energy consumption.

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