RV110E Joint Reducer

Introduction to RV gearbox:

RV transmission is a newly emerging type of transmission, which is developed on the basis of traditional needle pendulum planetary transmission. It not only overcomes the shortcomings of general needle pendulum transmission, but also has a series of advantages such as small size, light weight, large transmission ratio range, long service life, stable accuracy, high efficiency, and smooth transmission. It is increasingly receiving widespread attention both domestically and internationally. RV reducer is composed of cycloidal pinwheel and planetary support, which is widely used in industrial robots, machine tools, medical testing equipment, satellite receiving systems and other fields due to its small size, strong impact resistance, high torque, high positioning accuracy, low vibration, and large reduction ratio. It has much higher fatigue strength, stiffness, and lifespan than the commonly used harmonic drive in robots, and its hysteresis accuracy is stable,

working principle

The RV-E reducer is a two-stage reduction type.

第1 Reduction unit... spur gear reduction mechanism

The rotation of the input shaft is transmitted from the input gear to the spur gear, and is reduced according to the gear ratio. This is the first deceleration section.

第2 Reduction Parts... Differential Gear Reduction Mechanism

The spur gear is connected to the crankshaft and becomes the input of the second reduction section. Install through rolling bearings on the eccentric part of the crankshaftRV gear. In addition, the needle teeth on the inner side of the casing, which are only one more than the RV gears, are arranged with the same pitch.

If the fixed housing rotates the spur gear, thenThe RV gear also undergoes eccentric motion due to the eccentric motion of the crankshaft.

If the crankshaft rotates once at this time, thenThe RV gear will rotate one tooth in the opposite direction to the crankshaft.

This rotation is output to theThe shaft of the deceleration unit.

When fixing the shaft, the outer shell side becomes the output side.

There are many ways to use RV-E type reducers. The rotation direction and speed are shown in the following figure.

Please choose the best practical method.

第The reduction ratio i obtained by adding the first reduction unit and the second reduction unit varies depending on the usage method, and can be calculated based on the speed ratio value shown in the following formula.

Axis rotation situation

R: Speed ratio value

Z1: Input the number of teeth of the gear

Z2: Number of teeth of spur gear

Z3: Number of teeth of RV gear

Z4: number of needle teeth i: reduction ratio

Introduction to RV reducer structure:

The transmission device of the RV reducer consists of two parts: the first stage involute cylindrical gear planetary reduction mechanism and the second stage cycloidal pin gear planetary reduction mechanism. It is a closed differential gear system, as shown in Figure 2.2 for its structural schematic. The active sun gear 1 is connected to the input shaft. If the involute center gear 1 rotates clockwise, it will drive three planetary gears 2 arranged at 120 ° to revolve around the center gear axis while also rotating counterclockwise. The three crank shafts 3 are fixedly connected to the planetary gears 2 and rotate at the same speed. The two cycloid gears 4 with a phase difference of 180 ° are hinged on the three crank shafts and mesh with the fixed pin wheel. While their axes revolve around the pin wheel axis, they will also rotate counterclockwise, that is, clockwise. The output mechanism (i.e. the planetary frame) 6 is driven by three pairs of crankshaft support bearings mounted on it, transmitting the rotation vector on the cycloid wheel at a 1:1 speed ratio.