JP2549136Y2 - Ball screw moving device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a moving sleeve having a ball screw, that is, a thread groove, a rotating shaft having a plurality of hemispheric grooves formed through the moving sleeve and the ball, and The present invention relates to a feed screw and a motor driven by screwing a ball bearing between a screw groove and a plurality of hemispherical grooves for the ball screw.

(Prior Art) There have been various proposals for a conventional ball screw. For example, a plurality of nuts having a helical groove on the outer surface of Japanese Utility Model 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 disclosed in Japanese Utility Model Application 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 through the steel ball. A ball screw device comprising a nut having a female screw groove to be engaged, wherein the ball screw device has a circulation path of the steel ball, and at least one pair of half nuts formed by being divided on an axial surface of the nut; Hold the steel ball on the half nut At least one place on the inner surface of the half nut at a pitch distance of at least one pitch between the fixed holding tool, the recess groove provided at the root of the male screw groove, and the female screw groove on which the steel ball rolls. A fixed guide pin, and a land formed by a curved surface that is convex in the axial direction of the screw shaft to correct a pitch shift when the male screw groove and the female screw groove are screwed together.
No. 9 has a thread groove on the inner peripheral surface, a cutout is provided on the outside, and a straight pipe is attached to the cutout so as to communicate with some of the screw grooves, forming a nut body Then, a guide plate having a guide groove connecting the pipes in a shape corresponding to the notch portion is separately provided, and a ball is inserted in the screw groove between the pipe and the pipe and in the guide groove of the guide plate, and the notch portion is formed. A ball circulation device for a ball screw with a screwed guide plate, a ball screw shaft, a fixed sleeve through which the ball is inserted, and a rotating nut, a male screw groove on the screw shaft, and screw balls in several places on the fixed sleeve. An apparatus or the like in which a through hole to be inserted and a detent fitting into an axial vertical groove formed in the screw shaft, the fixed sleeve is equipped with a rotating nut via a ball bearing, or the like has been developed. In addition, in the case of an electric lifting device, There are known devices and the like utilizing processing.

(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. In addition, in a device that raises the thread groove shaft by one pitch when the rotating nut is further rotated one turn, the rotating nut cannot be moved up or down unless the rotating nut is turned forward in one direction or constantly rotated in one direction. In the vertical device using the motor, the friction between the screw and the nut was large, and when lifting an object having the same weight as that of the device of the present invention, a motor having a larger output was required.

Further, the amount of vertical movement in the conventional apparatus cannot be made larger than the length of the rotating shaft and the moving sleeve.

(Structure of the Invention) A screw shaft, a rotating shaft having a plurality of hemispherical grooves (which may be a spiral semi-circular groove fitted into a ball screw) fitted into the screw ball, and an end of the rotating shaft shift. A plurality of hemispherical grooves or semicircular grooves to be fitted to the buffer ball bearings are formed on the circumference of the center of the lower surface of the gears, and the plurality of hemispheres for the buffering ball bearings are formed. A plurality of buffer ball bearings are mounted in the groove or the semicircular groove, and a plurality of hemispherical grooves formed in the rotating shaft are formed on a side surface of the moving sleeve which is inserted and fitted into the rotating shaft and is in contact with the rotating shaft. A spiral semicircular groove for position fitting is formed, and one or more planes are formed on the vertical surface of the moving sleeve, and the one or more surfaces are formed on the side of the end of the fixed sleeve base that is in contact with the moving sleeve. By fixing the shape that fits with the plane, The rotation of the moving sleeve can be prevented, and the fixed sleeve base fitted and inserted into the moving sleeve is equipped with a motor and a power supply circuit, and the end of the motor is provided with a gear that meshes with and works with the gear at the end of the rotating shaft. The moving sleeve can be moved upward or downward by a screwing effect with the helical semicircular groove of the moving sleeve mounted on the rotary shaft by driving the motor to drive the motor. A hole is formed at the center of the rotating shaft, a female screw having a smaller diameter than the hole is formed at an end of the moving sleeve, and a male screw to be fitted to the female screw is fitted to the female screw of the moving sleeve. By rotating the male screw, the moving amount is further increased than the moving amount of the moving sleeve, and the movement can be adjusted (the female screw and the male screw provided on the moving sleeve can be fixed by the ratchet gear and the nail. Scheme, is or pressure fixing system tightening the shaft, or method of fixing a plurality of side holes in Akepin the axis can be mounted in the scheme can also be a mobile sleeve portion).

Also, the motor is removed, a ratchet gear or a manual handle (not shown) incorporating a gear is attached to the gear at the end of the motor, and the moving handle is rotated or stepped to rotate to move the moving sleeve. It can move up and down or up and down.

Further, the apparatus main body excluding the motor is made of a polymer compound or a metal, but either one or a mixture may be used.

(Embodiment) Hereinafter, a ball screw moving device in which a female screw and a male screw are incorporated in a moving sleeve of the ball screw moving device of the present invention will be described in detail with reference to the drawings.

The male screw 3 is fitted and inserted into the female thread portion 2 of the moving sleeve 1 and the moving sleeve 1 is fitted and inserted into the fixed sleeve base 4 (the shape is not necessarily the shape shown in the drawing). 5 and the anti-rotation protrusion 6 are assembled. A screw ball 8 is fitted and mounted on the rotating shaft 7 and screwed into the moving sleeve 1. The motor 9 and the power supply circuit 10 are mounted and fixed on the fixed sleeve base 4. And the rotating shaft 7
The rotating shaft gear 11 at the end of the motor 9 and the motor gear 12 at the end of the motor 9 are connected, and electricity is supplied from the power supply circuit 10 to the motor 9 to rotate the gears that are linked to rotate the linked rotating shaft 7. The moving sleeve 1 is moved up or down by the screwing effect of the screw ball 8 and the semicircular groove 13 of the moving sleeve 1 and the effect of the rotation preventing plane 5 of the moving sleeve 1. The rotating shaft 7 can be moved, and the rotation of the rotating shaft 7 can be smoothly operated by mounting the buffering ball bearings 15 in a plurality of hemispherical grooves or semicircular grooves 14 for buffering ball bearings on the lower surface of the rotating shaft gear 11. It is.

(Effect of the Invention) A simple structure in which a spiral semicircular groove is provided on the inner side surface of the moving sleeve and a plurality of hemispherical grooves are provided on the rotating shaft can be provided at low cost.

Furthermore, the conventional screw-and-nut type motor-driven vertical moving device has a low power transmission efficiency due to friction between the screw and the nut, and requires a motor with a higher output than the device of the present invention.

With the ball screw moving device of the present invention, power can be transmitted with a low coefficient of friction due to the rotation of the ball, and the rotation of the rotating shaft can be rotated with low resistance by the effect of the ball bearing for shock absorption, and the moving sleeve can be smoothly moved with a small force. Is what you can do.

Further, when the male screw fitted to the female screw at the end of the moving sleeve is rotated, the moving adjustment width can be made larger, and the distance between the object to be moved and the position where the device is fixed is large (movement of the device). (If there is an interval larger than the amount) It was necessary to put another object between the device and the object to be moved and adjust it, but with the female screw and male screw built-in device of the present invention, it is possible to adjust just by turning the male screw What
Further, in the case of a device without female screw or male screw device, the motor had to be driven for a long time if the interval of movement was large (within a range smaller than the movable sleeve can be moved). Without driving
First, the male screw is turned to bring the contact part of the male screw into contact with the moving object, or close to the moving object, so that the motor rotation can be reduced, the load on the motor is reduced, and the power consumption is reduced. In particular, in the case of a battery type, the number of times of use can be increased, thereby improving economic cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional front view and FIG. 2 is a cross-sectional view taken along line A-A 'of an embodiment of the present invention, in which a ball screw moving device according to claim (2) is applied to a jack. DESCRIPTION OF SYMBOLS 1 ... Moving sleeve 2 ... Female screw part 3 ... Male screw 4 ... Fixed sleeve base 5 ... Rotation prevention plane 6 ... Rotation prevention convex part 7 ... Rotation axis 8 ... Screw ball 9 ... Motor 10 Power circuit 11 Rotating shaft gear 12 Motor gear 13 Semi-circular groove 14 Semi-circular groove and semi-spherical groove for ball bearing for cushioning 15 Ball bearing for cushioning

Claims (3)

(57) [Scope of request for utility model registration] 1. A screw ball, a rotating shaft having a plurality of hemispherical grooves spirally fitted to the screw ball, a gear mounted on one end of the rotating shaft, and a buffer ball bearing. A plurality of hemispherical grooves or semicircular grooves for fitting the buffer ball bearing are provided on the circumference of the lower surface of the gear. A helical semicircular groove is formed on the side surface of the moving sleeve that is in contact with the rotating shaft so as to be engaged with the hemispherical groove, and one or more rotation preventing planes are fixed on the vertical surface of the moving sleeve. At the end of the sleeve base, a rotation-preventing projection corresponding to the plane is provided on a side surface that contacts the rotation-preventing plane,
Furthermore, the fixed sleeve base is provided with a motor and a power supply circuit, and an end of the motor is provided with a gear that is interlocked with a gear at an end of the rotating shaft. The motor is driven to operate, and the moving sleeve is moved upward or downward. Is a ball screw moving device that can move straight down. 2. A moving screw is provided with a female screw at the center of the end of the moving sleeve, a male screw to be screwed with the female screw, and a hole at the center of the rotating shaft in which the male screw can be stored. The ball screw moving device according to claim 1, wherein a larger amount of movement can be adjusted by rotating the male screw. 3. The moving sleeve is removed by removing the motor, attaching a manual handle with a ratchet gear or gear to the gear portion of the motor, and rotating or rotating the manual handle in small increments. The ball screw moving device according to claim 1, wherein the ball screw moving device can move straight upward or downward.