In‐line hedge trimmer with planetary gear drive and vibration damping blade assembly

A new mechanism construction for small tooth number difference planetary gear drive is developed in which the planet wheel is guided by a planar crank and oscillating block mechanism. The sizes of linkage are design dexterously to get an approximate circumference linkage curve so that the engaging condition of internal gear pair can be satisfied. The trajectory of the inner gear center motion is analyzed and its error comparing with a standard circle is calculated to avoid movement interference. The movement of inner gear is study particularly to deduced formula of instantaneous transmission ratio. Despite observable fluctuation of output speed, this new type of gear transmission mechanism still has potential application value in situation with large ratio and low input speed. A hand drive winch prototype using the mechanism is also illustrated in this paper.

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Experimental Investigations of Noise Control in Planetary Gear Set by Phasing

Journal of Engineering ◽

10.1155/2014/857462 ◽

2014 ◽

Vol 2014 ◽

pp. 1-11 ◽

Cited By ~ 4

Author(s):

S. H. Gawande ◽

S. N. Shaikh

Keyword(s):

Experimental Work ◽

Noise Level ◽

Planetary Gear ◽

Experimental Investigations ◽

Mesh Stiffness ◽

Gear Noise ◽

Gear Drive ◽

Internal Excitation ◽

Key Factor ◽

Set Up

Now a days reduction of gear noise and resulting vibrations has received much attention of the researchers. The internal excitation caused by the variation in tooth mesh stiffness is a key factor in causing vibration. Therefore to reduce gear noise and vibrations several techniques have been proposed in recent years. In this research the experimental work is carried out to study the effect of planet phasing on noise and subsequent resulting vibrations of Nylon-6 planetary gear drive. For this purpose experimental set-up was built and trials were conducted for two different arrangements (i.e., with phasing and without phasing) and it is observed that the noise level and resulting vibrations were reduced by planet phasing arrangement. So from the experimental results it is observed that by applying the meshing phase difference one can reduce planetary gear set noise and vibrations.

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A Multi-Purpose Planetary Gear Testing Machine for Studies of Gear Drive Dynamics, Efficiency, and Lubrication

Journal of Engineering for Industry ◽

10.1115/1.3438260 ◽

1973 ◽

Vol 95 (4) ◽

pp. 1123-1130 ◽

Cited By ~ 4

Author(s):

R. Kasuba ◽

E. I. Radzimovsky

Keyword(s):

Gear Tooth ◽

Measurement Techniques ◽

Testing Machine ◽

Planetary Gear ◽

Gear Drive ◽

Operational Characteristics ◽

Surface Durability ◽

Drive Dynamics ◽

Selection Of

Feasibility of a multi-purpose testing machine for research studies in gearing has been demonstrated with construction of a unique gear testing machine with a differential planetary gear drive. This machine was used in such interdependent studies as determination of instantaneous gear tooth engagement loads, minimum film thicknesses, and gear efficiencies. With minimal structural and mechanical modifications, this gear research machine can be used for studies of surface durability, thermal distribution in gear meshing zones, and effects of variable torques and torsional oscillations on performance of gearing. Most of these studies could be conducted simultaneously. Upon selection of appropriate gear ratios, this machine was operated either with one or two stationary gears. Presence of stationary gears simplified greatly the measurement techniques and increased the reliability of tests. This machine can accommodate spur, helical or any special type of gearing. Design and operational characteristics of this machine, as well as a short summary of research projects performed on this machine, are presented in this paper.

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