Eccentric Gear Research Articles

Trial production of a specific sliding varying type contact roller testing machine and its characteristics.

In the case of a general roller testing machine which is- employed at researching the tooth surface fatigue of gear materials, the specific sliding on test roller is constant during a rotation of the test roller. In this report, a new roller testing machine which can give a continuously varying specific sliding to the test roller was developed using an eccentric gear mechanism and its characteristics were elucidated. In this new type machine, the specific sliding of the test roller changes continuously in the ranges of -125% to 0%, -50% to +33% and 0% to +56 %. The minimum oil film thichness between the test rollers changes during a rotation of the roller with the change of circumferential velocity ratio of the roller pair. The change of the tangential force between the rollers during a rotation of the roller depends upon the changes of the normal force and the friction coefficient between the rollers.

Research on balancer drived by eccentric gear. 1st report. Theoretical investigation.

従来,単気筒ディーゼル機関などにおいて,一次のピストンその他の往復質量によって生じる慣性力を消去するために採用されているバランサは,連結比3.4で78%程度しか消去できない。本研究はこのバランサ駆動用の標準歯車にかわって偏心歯車を採用するとバランサ軸に不等速回転が与えられ,適切な偏心率を与えることによって往復慣性力の97%が消去できることを理論的に証明した。

Surface Durability and Surface Failure of Rolling Contact Roller Rotated at Non-uniform Velocity

In the case of a common rolling contact fatigue testing machine, the roller is rotated at uniform velocity. In this research the roller was rotated at non-uniform velocity by applying an eccentric gear mechanism to the machine in order to bring about a contact condition of rollers close to that of gears. Specific sliding of the roller was so adjusted as to change continuously from 0 % to -125 % during one rotation. Under this condition the rolling contact fatigue tests were performed using thermally refined and induction-hardened steel rollers. The roughness change of the roller and the surface failure were discussed in relation to the specific sliding.

歯車の偏心誤差と騒音スペクトル(第2報)

In gears with eccentric errors, the tooth-meshing frequency is subjected to both amplitude modulation and frequency modulation at the same time. Consequently, the noise spectrums consist of a large number of sidebands. The general equation about sideband levels is derived in the case the modulation signals include the high order harmonics of the angular frequency of the eccentric gear. The value of the parameter in the general equation is estimated from the change of the amplitude of the tooth-meshing noise and the fluctuation of the angular velocity of the input and the output shaft. The appropriateness of the general equation is shown by comparing the spectrum of the actual tooth-meshing noise with the calculated one by the general equation.

Dynamic Behavior of Planetary Gear : 7th Report, Influence of the Thickness of the Ring Gear

The authors studied experimentally the influences of the thickness of a ring gear on the fillet stress of the ring gear and the load distribution among each planet gear. The planetary gear used in this study is a single-stage Stoeckicht planetary gear (Type 2K-H) constructed with spur gears. The results are as follows : (i) The fillet stress of the tension side in the ring gear of a toothed thin-ring is smaller than that in the ring gear of a toothed thick-ring. But the fillet stress of the compression side in the former is larger than that in the latter. (ii) The influence of the eccentricity of the ring gear is sufficiently eliminated by using a ring gear floated with gear coupling, independently of the thickness of the ring gear. And the mean load distribution rates for each planet gear are nearly equal.

送りねじの効率に関する研究

In this paper, the method of machining and the experimental result of three types of nut thread flank for improving the lubricating property of lead screws are described, namely the nut thread flank with sloped entrance gap on the nut thread face, the nut thread flank with three dents per one pitch on the nut thread face, and the nut thread flank with hydrostatic recess. The obtained results are as follows.(1) The nut thread flank with sloped entrance gap on the nut thread face can be machined simply with excellent accuracy when the pitch is changed by exchanging the change gears of a lathe.(2) As for the nut thread flank with three dents per one pitch on the nut thread face and the nut thread flank with hydrostatic recess, the required forms can be obtained simply when a pair of eccentric gears are used in the change gear train of a lathe.(3) As for the experimental results, the minimum frictional coefficients of the nut thread flank with sloped entrance gap and the nut thread flank with three dents per one pitch on the nut thread face were O.12 and O.08, respectively. In case of the nut thread face with hydrostatic recess, the minimum frictional coefficient resulted in 0. 004, and the peculiar property to the hydrostatic lead-screw and nut assembly was shown.

Eccentric Gearing

This paper is concerned with an analysis and a design of eccentric gears. First the analysis makes the motion of the gears clear. As a result, the theoretical maximum eccentricity, the maximum change of the geometric center distance, and the angular velocity ratio are obtained. Next, two methods of designing are described and two pairs of eccentric gears are designed as examples. Finally, an approach for helical eccentric gears is presented.

Analysis and Design of Eccentric Gears

Analysis and Design of Eccentric Gears

機械の振動および歯車の偏心が糸むらにわよぼす影響

機械の振動および歯車の偏心が糸むらにわよぼす影響

ローラの振れと歯車の偏心が糸むらにわよぼす影響

ローラの振れと歯車の偏心が糸むらにわよぼす影響

Cutting Pseudo-Elliptical Gears (Part 2)

In our last report* under similar title the cutting pitch curve of a pseudo-elliptical gear was given by a two-termed expression in terms of polar tangential coordinates. In the present report the cutting pitch curve which is more closely approximate to an ellipse is given by a three-termed expression. The deviation of the pitch curve from the ellipse was calculated, and the result was compared with that of our last report. It cutting gears with the installation described in our last report, we had much trouble to renew the worm-wheel at everv chance of the dimensions of pseudo-elliptical gear. We eliminated the above mentioned inconvenience by using eccentric circular cams. Also we constructed for trial installation equipped with eccentric gears. The results are as follow : 1. Comparing the new pseuds-elliptical gears with those appeared in our last report, we have much closer approximation to and smaller deviation from the true elliptical ones, the theoretical value of deviation being less than 10% of that appeared. 2. Moreover in cutting gears of varipus dimensions the management of our new installation is far easier than that of our last one; i. e. we have only to adjust the eccentricities both the eccentric circular cams and the eccentric gears. * T. MATUYAMA and K. KON; "Cutting Pseudo-Elliptical Gears (Partl)" Transactions of the Society of Mechanical Engineers, Japan Vol. 20, No. 98, 1954 Part 4.

Cutting Pseudo-Elliptical Gears (Part 1)

Up to this time elliptical gears are not used widely, because of the difficulty in their production. In this research we tried to cut pseudo-elliptical gears which could be used in place of elliptical gears and be easily produced. Namely, we cut them employing a common hobbing machine and ordinary hobbs for spur gears, though a simple attachment installed with eccentric circular cams was laid on the hobbing machine. Also, the deviation of the pseudo-elliptical gears from the elliptical ones was calculated and then it was made clear that to what value the eccentricity of an elliptical gear could be raised without injuring the ability of replacement of the elliptical gear by the pseudo-elliptical one.

Method of Cutting Special Toothed Wheels with Hobbing Machine to which Eccentric Gears attached

Method of Cutting Special Toothed Wheels with Hobbing Machine to which Eccentric Gears attached

The Practice and the Application of Eccentric Gears

The Practice and the Application of Eccentric Gears

偏心歯車による特種歯切法

偏心歯車による特種歯切法

偏心歯車の實際とその應用

偏心歯車の實際とその應用

偏心歯車(宮城教授退官記念講演)

偏心歯車(宮城教授退官記念講演)

Improvements in and relating to Apparatus for Hank Dyeing

467. Dean, J., and Barker, H. Jan. 6. Circulating fluids through materials.-Hanks are carried on a frame, forming a more or less solid block of material, one or more charged frames being lowered into a vat. for example two in a double vat; the blocks of hanks are oscillated while the treating liquor is circulated through them. The double vat A may be formed by two parallel partitions D and is provided with the usual circulating - means P, P , P , which is fed from the space between the partitions D, and which feeds the parts of the containing - portions of the vat A below false bottoms A , or vice versa. The frames or cages C are suspended from arms B connected to rising and falling arms B , levers B , and eccentric gear B which provides vertical and, if desired, also horizontal oscillation of the frames.