A dense bead type rotary and reciprocating two-degree-of-freedom rolling shaft system

Abstract

The invention discloses a dense ball type rotating and reciprocating two-degree-of-freedom rolling shaft system which comprises a transmission spindle (1), two bearing outer covers (6) and two dense ball type bearings (7), wherein two ends of the transmission spindle (1) are supported by the two dense ball type bearings (7); a bearing outer cover (6) is arranged on the outer side of each dense ball type bearing (7); the exteriors of the bearing outer covers (6) are fixed; the dense ball type bearings (7) comprise retainers (8) and balls (9) and are of overall multi-ball dense-row structures; the retainers (8) are of ring cover structures with certain thicknesses; multiple communicated bearing bush-shaped hole slots are formed in the walls of the ring covers, and are of exterior-opened and interior-tightened structures; the opened opening part is a cylindrical surface; the interior tightened part is a spherical arc surface; the two parts of profiles are tangential; and the balls (9) are assembled in the hole slots and are in clearance fit with the outer cylindrical surface of the transmission spindle (1) and the inner cylindrical surfaces of the bearing outer covers (6).

Description

technical field [0001] The invention belongs to the field of machinery and relates to a rolling shaft system. Background technique [0002] At present, only the APOLLO series of probes in the United States and the LUNA series of probes in the former Soviet Union have achieved lunar sample collection and returned to Earth, and they all use the drilling sampling method. It can be seen that for the lunar sampling mission, the drilling method is the most effective method proved by practice. Further analysis shows that no matter APOLLO manned lunar landing sampling or LUNA unmanned self-sampling, both adopt the rotary and impact compound drilling method, which is more conducive to powder discharge drilling and troubleshooting. [0003] When sampling the lunar surface, the drilling schematic diagram of drilling tool 2 is as follows: figure 1 shown. The part shown in the box in the figure is the transmission shaft system, which is composed of the transmission main shaft 1 and th...

AI Technical Summary

Problems solved by technology

[0009] The technical problem solved by the invention is: to overcome the problems of complex structure, large volume, heavy weight and poor bearing capacity, low reliability and low transmission efficiency of the existing nested composite shaft system, and provide a With simple structure, small size, light weight, strong bearing capacity, high reliability and high transmission efficiency, dense ball bearings are used to realize the rolling shaft system with double-degree-of-freedom rolling support for rotation and reciprocation

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