JP2551275Y2 - Ball screw equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a ball screw, that is, a screw shaft having a thread groove formed thereon and a rotary nut having a thread groove formed through the ball. The present invention relates to a feed screw and the like screwed with a ball interposed between both grooves.

(Prior Art) There have been various proposals for a conventional ball screw.

For example, a plurality of nuts having a spiral groove on the outer surface of Japanese Utility Model Application Laid-Open No. 59-77652 and one end fixed to the nut and having a neutral surface in bending parallel to the axis of the feed screw and parallel to each other. A leaf spring, and a bracket to which the other end of the leaf spring is fixed and which supports the nut via the leaf spring from the front and rear in the axial direction, wherein the leaf springs disposed before and after the nut are parallel to each other. A screw shaft having a leaf spring or a male screw groove of Japanese Utility Model Laid-Open No. 61-1767, a plurality of steel balls rolling on the male screw groove, and a screw screwed into the male screw groove via the steel ball. A ball screw device comprising a nut having a female thread groove to be engaged, wherein the ball screw device has a circulating path of the steel ball, and at least one pair of half nuts formed by being divided along an axial surface of the nut; Hold the steel ball and fix it to the half nut And a relief groove provided at the root of the external thread groove, and at least one location on the inner surface of the half nut at a pitch interval of at least one pitch between the internal thread grooves on which the steel balls roll. And a land portion formed by a curved surface that is convex in the axial direction of the screw shaft, and corrects a pitch deviation when the male screw groove and the female screw groove are screwed together.
No. 2 has a thread groove on the inner peripheral surface, a cutout portion is provided on the outside, and a straight pipe is attached to the cutout portion so as to communicate with a part of the screw groove to form a nut body. And a guide plate having a guide groove for connecting the pipe in a shape corresponding to the notch is separately provided, and a ball is inserted into the screw groove between the pipe and the pipe and the guide groove of the guide plate to guide the notch. It consists of a ball screw ball circulation device with a screwed plate, a screw shaft for balls of Japanese Utility Model Application Laid-Open No. 63-9547, a fixed sleeve through which it is inserted, and a rotating nut.The screw shaft has a male screw groove and a fixed sleeve. Has a through hole into which a screw ball is inserted in several places and a detent which fits in an axial longitudinal groove formed in the screw shaft, and the fixed sleeve is provided with a rotating nut via a ball bearing. Etc. are being developed.

(Problems to be Solved by the Invention) In the above-mentioned conventional technology, it is necessary to cut the ball screw groove on both the screw shaft side and the nut side. In addition, the precision of cutting over the length of the screw shaft that both thread groove pitches exactly match was required. In order to prevent the ball from falling out of the groove, special accessories and processing such as a ball holder and a device for measuring the circulation of the ball are required, and these accessories warp and hinder smooth operation. Further, in a device for raising the thread groove shaft by one pitch when the rotary nut is further rotated one turn, the rotary nut cannot be moved up or down unless the rotary nut is fed forward or constantly rotated in one direction.

(Structure of the Invention) A thread groove shaft for a ball screw, a fixing sleeve into which the ball screw is inserted, a plurality of through-holes to be fitted into the screw groove for the ball screw in a rotating nut, and the same number of screws as the plurality of through-holes A ball is incorporated into the plurality of through holes, and a semicircular groove or a plurality of hemispherical grooves is provided on the circumference of the lower surface of the rotating nut at right angles to the perpendicular of the ball screw groove axis. A semicircular groove of the same shape or a plurality of hemispherical grooves at the same position facing the semicircular groove of the rotating nut or a plurality of hemispherical grooves around the circumference, and the ball bearing is provided with the semicircular groove facing the semicircular groove or a plurality of semicircular grooves. Into the hemispherical groove, buffers the rotation of the rotating nut and the fixed sleeve, and further forms an axial vertical groove in the screw groove shaft (a polygonal vertical hole or a central hole in the center of the screw groove shaft). A vertical round hole with a key groove or a plurality of vertical round holes A vertical hole having a shape, a vertical round hole formed with a key groove, or a polygonal mandrel or a keyed round bar fitted into a plurality of vertical round holes, or a plurality of round rods is fixed on a base, or Can be attached and fixed to the fixed sleeve to prevent rotation of the screw groove shaft), and a detent is provided inside the fixed sleeve to prevent rotation of the screw groove shaft fitted to the axial groove. A pivoting portion for attaching the gear to the rotating nut, attaching a gear nail with a lever fitted to the gear to the rotating ring, and rotatably rotating the gear nail with the lever, and the gear nail with the lever Attach a stopper that stops at a fixed angle, and apply the lever-equipped pawl to the stopper to apply the lever-equipped pawl (the gear may be a combination of ratchet and ratchet pawls; Or union with left-handed ratchet So the gears with claw the lever also may) Engage the rotation, or by moving in small increments,
The rotating nut can be rotationally synchronized, and the screw groove shaft can be raised upward. Further, by disengaging the gear and the lever-equipped pawl, and rotating the rotating ring. It can be lowered downward.

(Example) Hereinafter, the ball screw device of the present invention will be described in detail with reference to the drawings.

A fixed sleeve 2 is fitted and fixed to a fixed base 1 (the shape need not be the shape shown in the figure).

A rotary nut 4 is rotatably mounted on the fixed sleeve 2 via a ball bearing 3 and is inserted through the rotary nut 4 and the fixed sleeve 2 to form a ball screw groove 6 having a substantially radial shape of a screw ball 5 on the outer periphery. The thread groove shaft 7 is vertically movably inserted.

The rotary nut 4 has a plurality of through holes 8 into which the screw balls 5 are inserted corresponding to the ball bearings 3 and the ball screw grooves 6 of the screw groove shaft 7 (in the illustrated embodiment, the ball screw grooves 6). (Equivalent of 4 for one pitch screw length)
The screw ball 5 is inserted between the through hole 8 and the ball screw groove 6.

A longitudinal groove 9 is formed in the thread groove shaft 7 in the axial direction. A detent 10 is fitted to the longitudinal groove 9 and fixed to the fixed sleeve 2 to prevent the rotation of the screw groove shaft 7.

The pivoted jaw 11 with lever attached to the rotation ring 16
A stopper 14 is attached to the rotating ring 16 to stop the gear claw 11 with the lever at a fixed angle by rotating the gear 12 around the gear 13 fixed to the rotation nut 4 and fixed to the gear 13 with the lever. When the pawl 11 is rotated, the rotating ring 16 rotates and the rotary nut 4 is rotated and synchronized. Further, the lever-equipped pawl 11 is rotated about the pivotal attachment portion 12 to release the engagement with the gear 13 to thereby rotate the rotatable nut 4. The screw groove 7 can be lowered by turning the flange 4 and is inserted into a ball bearing semicircular groove or a plurality of hemispherical grooves 13 (one of which is used) of the fixed sleeve 2. The ball bearing 3 is inserted and fitted in a semicircular groove or a plurality of hemispherical grooves 13 (either one of which is used) of the rotating nut 4 to make the rotation of the rotating ring 16 light and facilitate the thread groove shaft. 7 can be moved up or down Things.

As a matter of course, if the screw shaft 7 is rotatable and rotated as in the case of the bolt nut, it is clear that the fixed sleeve 2 and the rotary nut 4 can move.

(Effect of the Invention) The present invention is configured as described above, and it is not necessary to form a thread groove on the inner peripheral surface that is difficult to cut, and it is possible to simplify machining by only cutting a thread groove shaft that is relatively easy to cut. The hole for loading the screw ball of the rotating nut is only required at several places of the drill hole from the outer periphery, so it is easy to get the accuracy easily. Further, the ball bearing is inserted into the semi-circular groove or multiple semi-spherical grooves of the rotating nut and the fixed sleeve. The rotating friction of the rotating nut and the fixed sleeve is small due to the effect of the ball bearing, and a heavy object can be moved up and down with a small force. By further increasing the length of the lever of the jaw with lever, a larger torque can be output. In addition, the rotation of the rotation ring can be rotated with a small force due to the effect of the ball bearing with little friction, and the rotation ring can also be rotated in small steps, so that the narrow space In the meantime, you can easily work from one direction,
Further, a motor can be attached and fixed to the fixed sleeve, and the gear attached to the rotating ring can be meshed with the gear attached to the rotating portion of the motor to vertically move the screw groove shaft.

As described above, according to the present invention, processing is extremely easy, and therefore, it can be provided at a low cost, and a great effect can be obtained.

[Brief description of the drawings]

1 shows an embodiment of the present invention, in which a ball screw device is applied to a jack, FIG. 1 is a sectional front view, FIG. 2 is a sectional plan view taken along the line B-B 'of FIG. 1, and FIG. FIG. 4 is a plan view of the gear meshing section taken along the line A-A 'in FIG. 1, and FIG.
FIG. 4 is a plan view of a cross-section where gears mesh with each other. DESCRIPTION OF SYMBOLS 1 ... Fixed base 2 ... Fixed sleeve 3 ... Ball bearing 4 ... Rotating nut 5 ... Screw ball 6 ... Ball screw groove 7 ... Screw groove shaft 8 ... Through hole 9 ... Vertical groove 10 ... … Detent stop 11… Gear claw with lever 12… Pivot 13… Gear 14… Stopper 15… Semicircular groove, hemispheric groove 16… Rotating ring

Claims (2)

(57) [Scope of request for utility model registration] 1. A thread groove shaft for a ball screw, a fixed sleeve into which the ball screw shaft is inserted, a plurality of through holes for fitting the thread groove for the ball screw into a rotating nut, and the same number of the plurality of through holes. A semicircular groove or a plurality of hemispherical grooves are provided at right angles to the circumference of the screw groove axis on the circumference of the screw ball and the lower surface of the rotary nut, and the rotary nut is provided on the circumference of the upper surface of the fixed sleeve. A semicircular groove having the same shape or a plurality of hemispheric grooves is provided at the same position facing the semicircular groove or the plurality of hemispheric grooves, and the buffer ball bearing is provided with the semicircular groove facing the semicircular groove or the plurality of semicircular grooves. Insert into hemispherical groove. Further, a longitudinal groove is formed in the screw groove shaft in the axial direction, and a detent for preventing rotation of the screw groove shaft fitted into the vertical groove is provided inside the fixed sleeve. Also, the rotation nut has a gear, the rotation ring has a lever claw fitted to the rotation nut claw, a lever mounting portion for rotatably rotating the lever claw, and a lever claw. By attaching a stopper that stops at a fixed angle, the rotation nut can be rotated and synchronized by operating the gear with a lever, the screw groove shaft can be raised upward, and furthermore, the engagement between the gear and the gear claw with the lever can be performed. An apparatus for a ball screw, wherein the device can be lowered downward by releasing the alignment and rotating the rotating ring. 2. A motor is mounted on and fixed to the fixed sleeve, and a gear linked to the gear of the rotary nut is mounted on the motor. The gear of the rotary nut and the gear mounted on the motor are linked to correct the motor. The ball screw device according to claim 1, wherein the screw groove shaft can be moved upward or downward by rotating or reversely rotating.