robot precision gear unit
Sizes: RV-25N RV-42N RV-60N RV-80N RV-100N RV-125N RV-160N RV-380N RV-500N RV-700N
RV120 RV150 RV190 RV220 RV250 RV280
RVE120 RVE150 RVE190 RVE220 RVE250 RVE280
• 1st stage Spur gear reduction
An input gear engages with and rotates spur gears that are coupled to crankshafts. Several overall gear ratios can be provided by selecting various first stage ratios.
2nd stage Epicyclic gear reduction
• Crankshafts driven by the spur gears cause an eccentric motion of two epicyclic gears called RV gears that are offset 180 degrees from one another to provide a balanced load.
• The eccentric motion of the RV gears causes engagement of the cycloidal shaped gear teeth with cylindrically shaped pins located around the inside edge of the case.
• In the course of one revolution of the crankshafts the teeth of the RV gear move the distance of one pin in the opposite direction of the rotating cranks. The motion of the RV gear is such that the teeth remain in close contact with the pins and multiple teeth share the load simultaneously.
• The output can be either the shaft or the case. If the case is fixed, the shaft is the output. If the shaft is fixed, the case is the output.
All gears are carburized with high load, low noise, low vibration, low inertia and long life, high precision for low deviation in rotary direction. Low cost for all of application.
Direction of rotation and gear ratio
Ration: 41 81 102.17 102.81 107.66 125.21 126 137 156 164.07 141 145.61 161 201 171 75 93 117 139 162 185 81 105 123 144 159 192.75 105 118 142.44 159 183 203.52
Product code
The overall speed ratio i (of the First and Second reduction stages) will differ between shaft rotation and case rotation, and can be calculated from the speed ratio.
