Planetary roller screw rod adopting gear transmission mode

Abstract

The invention relates to a planetary roller screw rod adopting a gear transmission mode. Threads, ring teeth, gears and polished shafts are sequentially arranged in the middle of each roller outwards,wherein an inner hole of a nut mainly has three structures in the axial direction; the three structures include inner gear ring installation structures located at the two ends of the nut, ring toothstructures symmetrically distributed at the two ends of the nut and a receding step hole in the middle section of the nut; the rollers are evenly distributed on the periphery of the screw rod; the threads in the middle are meshed with the threads of the screw rod and are not meshed with the nut; the ring teeth at the two ends of each roller are meshed with the ring teeth at the two ends of the nut; the gears on the outer sides are meshed with gears of inner gear rings installed in the inner gear ring installation structures of the nut; and the polished shafts at the two ends are matched with round holes evenly distributed in a planetary carrier. The planetary roller screw rod has a constant lead, thread machining of the nut is omitted, only the ring teeth are machined at the two ends of the nut to bear axial loads, the transmission ratio of the rollers to the nut is guaranteed through the gears at the two ends of each roller, and lead uncertainty caused by mutual sliding of the rollersand the nut is avoided.

Description

technical field [0001] The invention relates to a planetary screw transmission mechanism for converting rotary motion into linear motion, in particular to a planetary roller screw for heavy-duty high-speed transmission. Background technique [0002] Compared with the ball screw, the roller screw has the characteristics of stronger load capacity, faster speed, higher precision, longer life and low maintenance cost, so it has become a precision mechanical equipment such as aviation machinery, CNC machine tools, precision instruments and meters. One of the most critical basic components in the industry, and has been widely used. [0003] In addition to screw, nut and roller, planetary roller screw also includes inner ring gear, planet carrier, retaining ring and other parts. According to the relative movement form between the roller and the nut and the screw during the transmission process, the planetary roller screw can be roughly divided into three types: standard type, nut ...

AI Technical Summary

Problems solved by technology

In the recirculating planetary roller screw, the roller is a pure ring tooth structure, and the nut is a thread structure, and there are defects such as large noise during transmission.

In other forms of planetary roller screws, the rollers have a ring-tooth structure, and the nut also has a ring-tooth pure structure, but in the transmission process, there is a defect that the lead is uncertain in principle.

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