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

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.

Claims

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.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIGS. 1A and 1B show the micro-movement subassembly for angle adjustment of the present invention, where FIG. 1A is a section view and FIG. 1B is a cross section view along the A-A line in FIG. 1A of the micro-movement subassembly.

(2) FIGS. 2A to 2C show the slotted knurling handle of the present invention, where FIG. 2A is a section view of the slotted knurling handle, FIG. 2B is the cross section view along the A-A line in FIG. 2A of the slotted knurling handle, and FIG. 2C is the surface view of the handle.

(3) FIGS. 3A and 3B show the turnbuckle of the present invention, where FIG. 3A is a section view of the turnbuckle, and FIG. 3B is a view of the appearance of the turnbuckle.

(4) FIG. 4 shows the central cylinder of the present invention.

(5) FIG. 5 shows the screw tooth surfaces of ungrooved screw pairs with grease added and without one-way preload in the present invention.

(6) FIG. 6 shows the screw tooth surfaces of grooved screw pairs with excess grease flowing into grooves under one-way preload in the present invention.

(7) FIG. 7 shows the screw tooth surfaces of ungrooved screw pairs with grease added and one-way preload in the common structures.

DETAILED DESCRIPTION OF THE INVENTION

(8) In connection with the attached figures, the present invention is further explained in details.

(9) As shown in FIGS. 1 to 7, the good-orientation, low-drift micro-movement subassembly for angle adjustment comprises a slotted knurling handle 1, a turnbuckle 2, and a central cylindrical shaft 3.

(10) As shown in FIGS. 2A to 2C, the slotted knurling handle 1 is a cylindrical stepped cylinder which can be divided into a central cylindrical countersink section, an internally threaded hole section and an unthreaded hole section from the inside to the outside. The inner wall of the internally threaded hole section has internal thread and through grooves which are evenly distributed along the circumferential direction and extends through the entire internal threaded hole.

(11) As shown in FIGS. 3A and 3B, the turnbuckle 2 is a three-step hollow cylindrical rod divided into a small stage, a middle stage and a large stage, and external threads are machined on the outer surfaces of the small stage and the large stage.

(12) As shown in FIG. 4, the central cylindrical shaft 3 is a cylindrical rod. One end of the central cylindrical shaft 3 fits in transition or interference with the central cylindrical countersink portion of the slotted knurling handle 1, and the external thread of the small stage of turnbuckle 2 is assembled with the inner thread of the slotted knurling handle 1, and the middle stage fits with the unthreaded hole of the slotted knurling handle 1.

(13) The outer surface of the middle stage of the turnbuckle 2 is marked with the lengthy range of the stroke along the axial central line, the 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 pitch, and the middle stage of the turnbuckle 2 is in clearance fit with the unthreaded hole of the slotted knurling handle 1.

(14) One end of the central cylindrical shaft 3 is a flat surface and the other end is a spherical surface which is used to point contact with the dome-driven member.

(15) The assembly of the present invention may be adjusted as follows. The precision cylindrical surface of the central cylindrical shaft 3 fits with the precision cylinder inner hole of the turnbuckle 2 to realize the precision leading function. The external thread of the turnbuckle 2 is coated with grease. The turnbuckle 2 is assembled with the slotted knurling handle 1 by thread sequentially. Then one end of the central cylindrical shaft 3 is connected with the central cylinder of the slotted knurling handle 1 through a transition or interference fit. In the absence of tension, the gaps on both sides of the thread are filled with grease, just as shown in FIG. 5. When the assembly is installed in an optical mount, there is always a unidirectional force pulling the handle towards turnbuckle. By turning the slotted knurling handle 1 back and forth, the excess grease in the threaded pair flows into the through groove of the slotted knurling handle 1 under the unidirectional force to generate the one-way tight fit of the screw tooth surface and improve the piston effect produced by the non-rigid contact, just as shown in FIG. 6. At the same time, due to the absorption of grease on the surface of the screw tooth, a small amount of grease will be carried into the one-way tight fit surfaces during the adjustment to achieve lubrication and smooth operation without hysteresis. Just as shown in FIG. 7, if there is no through groove in the inner wall of the internally threaded hole of the handle, the excess grease in the thread gap under the unidirectional force will be subjected to pressure to form piston effect which situation is highly susceptible to temperature changes or shock, changing the distribution of the grease, and changing the relative position between the handle and the turnbuckle.

(16) Once the turnbuckle 2 is fixed on when used, and the slotted knurling handle 1 is turned clockwise, the central cylindrical shaft 3 is driven forward precisely along the thread. When the slotted knurling handle 1 is turned in the opposite direction, the central cylindrical shaft 3 is driven backward precisely along the thread. In the angle adjustment mechanism, the present invention can realize precision adjustment of the angle.

(17) The displacement is A (A represents the adjustment range). Experiment shows that 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.

(18) The scope of the present invention is not limited by the detailed descriptions, and one of ordinary skill in the art could modify and change of the micro-movement assembly without departing from the scope of the present invention.