Good-orientation, low-drift micro-movement subassembly for angle adjustment

Patent metadata

Field	Value
Publication number	US-11092218-B2
Application number	US-201916514911-A
Country	US
Kind code	B2
Filing date	Jul 17, 2019
Priority date	Mar 15, 2019
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

A good-orientation, low-drift micro-movement subassembly for angle adjustment as a precise driving screw for angle adjustment, comprising a slotted knurling handle, a turnbuckle and a central cylindrical shaft. The invention is precise for linear displacement, good orientation, low-drift, stable and reliable adjustment, which can be used for a variety of precision-oriented, small drift, precision micro-angle adjustment of the drive screw.

First claim

We claim:

1. A micro-movement subassembly for angle adjustment, comprising
a slotted knurling handle,
a turnbuckle, and
a central cylindrical shaft,
wherein the slotted knurling handle is a cylindrical stepped cylinder that comprises a central cylindrical countersink section, an internally threaded hole section, and an unthreaded hole section from inside to outside;
an inner wall of the internally threaded hole section of the slotted knurling handle has internal thread and through grooves are evenly distributed along a circumferential direction and extends through the entire internally threaded hole section;
the turnbuckle is a three-step hollow cylindrical rod having an axial central line and being divided into a small stage, a middle stage, and a large stage, and external threads are machined on outer surfaces of the small stage and the large stage;
the central cylindrical shaft is a cylindrical rod; and
one end of the central cylindrical shaft fits in transition or interference with the central cylindrical countersink section of the slotted knurling handle, and the external thread of the small stage of turnbuckle is assembled with the inner thread of the slotted knurling handle, and the middle stage of the turnbuckle fits with the unthreaded hole section of the slotted knurling handle.

2. The micro-movement subassembly for angle adjustment according to claim 1 , wherein outer surface of the middle stage of the turnbuckle is marked with a lengthy range of stroke along the axial central line, an outer end portion of the unthreaded hole of the slotted knurling handle is an outer surface with a slope, and the outer circle surface of the slope is marked with the same scale according to the stroke, and the middle stage of the turnbuckle is in clearance fit with the unthreaded hole of the slotted knurling handle.

3. The micro-movement subassembly for angle adjustment according to claim 1 , wherein one end of the central cylindrical shaft is a flat surface and other end is a spherical surface being used to point contact with a dome-driven member.

4. The micro-movement subassembly for angle adjustment according to claim 1 , wherein the thread fits between the external thread of the small stage of the turnbuckle and the inner threaded hole of the slotted knurled handle is filled with grease, whereby, with an unidirectional preload, excess grease flows into the through groove to generate a one-way tight fit of a screw tooth surface, improving the non-rigid contact by the grease filling and decreasing drift caused by existence of the thread fit clearance.

Assignees

• Shanghai Inst Optics & Fine Mech Cas

Inventors

• Zhu Jianqiang
• Tang Gengxiu
• Liu Zhigang
• Du Lifeng
• Pang Xiangyang
• Zhang Chao

Classifications

• F16H57/0497

  Screw mechanisms · CPC title

• F16H25/2003 Primary

  with arrangements for taking up backlash (F16H25/2209 takes precedence) · CPC title

• F16H57/0464

  Grease lubrication · CPC title