Double ring reducer

Abstract

The invention provides a double-ring reducer. The double-ring reducer comprises a center wheel, a convex gear, a ring plate balance wheel, a frame and a casing. The frame comprises two end plates anda penetration rod connected between the two end plates. The center wheel comprises a central shaft and a first gear which are integrally formed, and the two ends of the central shaft are respectivelymounted on the two end plates by support bearings. The convex gear comprises a hollow gear shaft, a second gear and two cams which are integrally formed, and the second gear is located between the twocams. The convex gear is disposed outside the penetration rod through a support bearing in the sleeve mode, the second gear is meshed with the first gear, and the convex gear is distributed around the center wheel. The ring plate balance wheel is provided with an external gear and an inner hole, and the inner hole is matched with a cam of the convex gear, and the external gear is meshed with internal teeth of the casing. A planetary wheel and a crankshaft are integrated to form the convex gear, the structure rigidity is high, the transmission motion precision is higher, and the influence of machining errors on the motion precision is reduced. The penetration rod and the convex gear are coaxially arranged, and the rigidity is increased, so that the power of the double-ring reducer is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of reducers, in particular to a double-ring reducer. Background technique [0002] The front stage of the 2K-V type reducer is an ordinary involute gear external meshing, and the rear stage gear is internal meshing. The tooth profile can be involute or cycloidal, so it is divided into involute 2K-V type Types of transmission and cycloid 2K-V type transmission, the latter is called RV (Rotary Vector) reducer in Japan. [0003] The RV reducer is a precision reducer widely used in industrial robots. It is a reducer developed on the basis of the traditional pendulum planetary transmission. The commonly used RV reducer includes a pin gear housing. There is a planet carrier formed by connecting two monomers through connecting elements, two cycloidal wheels are arranged between the two monomers, and the bearing positions of three tapered roller bearings are arranged in a ring array on the two monomers. , the thre...

AI Technical Summary

Problems solved by technology

[0004] The RV reducer has the following disadvantages: because there are three crankshafts (that is, power input shafts) for transmission, the three crankshafts are all supported on the bearing positions of the tapered roller bearings of the planet carrier through tapered roller bearings, so the crankshaft The axial precision and radial precision requirements of the tapered roller bearing bearing position are very strict. The two eccentric wheels on the crankshaft are respectively adapted to the cycloidal wheel, and the roundness, cylindricity and phase difference of the two eccentric wheels are very demanding. Strict, the end of the crankshaft must be splined to install the planetary gear, and the phase difference between the spline groove and the eccentric wheel is very strict. These dimensional chains greatly increase the processing difficulty of the crankshaft, and the manufacturing cost is high. The assembly accuracy of the shaft also has high requirements; during use, the tapered roller bearings are easy to wear, resulting in reduced matching accuracy, poor reliability, and reduced service life

[0005] Moreover, in the 2K-V type speed reducer in the prior art, the fixed tie rods connected to the planet carrier and the crankshaft are independently distributed, respectively occupying the space inside the speed reducer, reducing the number of flows transmitted by power splitting; at the same time, the planetary transmission Located at one end of the crank drive, resulting in a complex assembly structure of the reducer, asymmetrical force, and large deformation errors

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