What is a cycloidal speed reducer?
A cycloidal drive or cycloidal speed reducer is a mechanism for reducing the speed of an input shaft by a certain ratio. Cycloidal speed reducers are capable of relatively high ratios in compact sizes with very low backlash. The radial motion of the disc is not translated to the output shaft.
Are cycloidal drives back drivable?
Backdriveability of Cycloidal drives Cycloidal drives are not, in general, backdrivable.
What is a cycloidal gear used for?
A cycloidal gearbox uses the principles of cycloidal gears to provide high gear ratios (often 100:1 or greater) with excellent torsional stiffness, good shock load capacity, stable backlash over the gearbox life, and low wear.
What is meant by cycloidal gear?
The cycloidal gear profile is a form of toothed gear used in mechanical clocks, rather than the involute gear form used for most other gears. This ensures that the motion of one gear is transferred to the other at locally constant angular velocity.
What is cycloidal motion?
cycloid, the curve generated by a point on the circumference of a circle that rolls along a straight line. If r is the radius of the circle and θ (theta) is the angular displacement of the circle, then the polar equations of the curve are x = r(θ – sin θ) and y = r(1 – cos θ).
Can you Backdrive a cycloidal gearbox?
The cycloidal drive is an ideal mechanism that can offer a high transmission ratio while maintaining a thinner profile and lower reflected inertia that allows torque less than 1 Nm to backdrive [15].
Where are cycloidal drives used?
motion control applications
The majority of gears used in motion control applications — including spur, helical, and bevel designs — are involute gears. However, cycloidal gears are a good choice for motion control applications that require very high gear ratios (often greater than 100:1), low friction, and excellent wear resistance.
Why do we prefer involute gear over cycloidal gear?
The involute profile of teeth is preferred over the cycloidal profile of teeth because only one curve is required to cut. Involute teeth have a number of benefits as compared to the Cycloidal profile as mentioned in the given table. It involves a double curve for the teeth, epicycloid and hypocycloid.
What are the benefits of involute and cycloidal gears?
In involute system, basic rack has straight teeth and the similar can be cut by simple tools. Advantages of cycloidal gears 1. As cycloidal teeth have wider flanks, thus cycloidal gears are stronger than involute gears for the equal pitch. Due to this cause, cycloidal teeth are prefer specifically for cast teeth.
What is the reduction rate of a cycloidal drive?
The reduction rate of the cycloidal drive is obtained from the following formula, where P means the number of the ring gear pins and L is the number of lobes on the cycloidal disc. Single-stage efficiency approaches 93% and double-stage approaches 86%.
What is cycloidal drive?
Cycloidal drive. A cycloidal drive or cycloidal speed reducer is a mechanism for reducing the speed of an input shaft by a certain ratio.
What is the maximum single stage reduction for a cycloid?
Single stage reductions are available commercially up to 119:1 and double stage up to 7,569:1. The cycloid disc is usually designed with a shortened cycloid in order to minimize the eccentricity of the disc and the associated unbalance forces at high speeds.
How does the cycloidal drive operate in reverse mode?
The cycloidal drive can operate in reverse mode, that is, with power flowing from the follower shaft to the base shaft. In reverse mode, torque transfer efficiencies are typically negligible. You can adjust the efficiency by changing the value of the Efficiency from follower shaft to base shaft parameter.