WO2011040690A1 - 컨택 노출형 베어링 스크류 이송장치 - Google Patents
컨택 노출형 베어링 스크류 이송장치 Download PDFInfo
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- WO2011040690A1 WO2011040690A1 PCT/KR2010/003166 KR2010003166W WO2011040690A1 WO 2011040690 A1 WO2011040690 A1 WO 2011040690A1 KR 2010003166 W KR2010003166 W KR 2010003166W WO 2011040690 A1 WO2011040690 A1 WO 2011040690A1
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- WIPO (PCT)
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- screw
- rod
- bearing
- screw shaft
- holder
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
Definitions
- the present invention relates to a screw feeder using a radial bearing, and more particularly, to a screw feeder using a radial bearing in which the radial bearings that rotate in position on the inner surface of the nut coupled to the screw shaft form a female thread. will be.
- screw feed is applied to either the screw shaft or the nut to linearly move the unpowered nut (and load connected thereto) or the screw shaft (and load connected thereto).
- the female screw is formed in the nut corresponding to the male screw formed on the screw shaft, the structure and shape of the female screw is various.
- a female thread is formed by cutting a thread engaged with a screw shaft male thread on the inner surface of the nut, and a female thread is formed by installing a ball that rotates along the valley of the screw shaft male thread on the inner surface of the nut.
- the female thread is formed by cutting the thread of the nut of the screw feeder, it is suitable for low speed feed, but is not suitable for a high feed speed and frequent feed frequency. This is because there is a lot of friction and noise and heat generation. Therefore, as a screw feeder having a high feed speed and frequent feed frequency, a ball screw feeder installed along a spiral path of the ball inside the nut is mainly used.
- the ball screw conveying device is structurally complex and difficult to process, and there is a tendency for gaps due to machining errors or wear to wear between the ball valleys of the ball and the screw shaft or between the ball cage of the ball and the nut. Collisions or friction occur frequently.
- a screw feeder in which a radial bearing having a rotating shaft fixed inside a cylindrical nut body is disposed on a spiral path and fixed.
- These screw feeders protrude radial bearing rotary shafts on the spiral path of the inner wall of the cylindrical nut body, insert the inner bearings of the radial bearings on the rotary shafts, and make the outer ring tip face move on the upper surface of the screw shaft male thread.
- the outer circumferential surface (side) of the outer ring can move through the side wall of the screw shaft male thread, or a hole is formed in the cylindrical nut body and a radial bearing is installed in the hole so that the outer ring is the side wall of the screw shaft male thread. Includes clouded top edges.
- Screw feeders using these radial bearings have great advantages over ball screws, but need improvement for the following reasons.
- the biggest disadvantage of the conventionally known radial bearing screw feeders is that the contact state between the radial bearing and the screw shaft cannot be visually confirmed. If there is a machining error in the machined parts before assembly or backlash occurs due to wear or deformation of the parts during use, the movement of the screw feeder is not smooth and vibrations or friction sounds are generated. It is necessary to adjust the preload between the radial bearing and the screw shaft to correct the error and eliminate backlash. In addition, in order to control the preload accurately, it should be possible to confirm that a machining error or backlash occurred between the radial bearing and the screw shaft at a certain point.
- all conventionally known radial bearing screw feeders have a disadvantage that it is impossible or difficult to check the contact state between the radial bearing and the screw shaft once externally assembled due to the use of a cylindrical nut body.
- the preload adjusting means disclosed in these inventions are all preload adjusting means in the direction of the screw shaft center.
- the radial bearing screw feeder adjusts the preload adjustment between the radial bearing and the screw shaft thread towards the center of the screw shaft, the radial radius of the radial bearings with respect to the screw shaft center will be different, resulting in new friction and noise Cause.
- the preload adjustment on one radial bearing affects the preload of the other radial bearing, so that the radial bearings can be adjusted to maintain the screw shaft and the proper preload.
- the present invention has been made to solve the above-mentioned disadvantages of the conventional bearing screw feed device, the first problem to be solved by the present invention is to provide a contact exposed bearing screw feed device reinforced with rigidity while improving processability and assembly There is.
- the second problem to be solved by the present invention is to provide a contact-exposed bearing screw feeder capable of precisely adjusting the preload only where necessary by visually checking the contact state between the radial bearing and the screw shaft. There is.
- the third problem to be solved by the present invention is to provide a contact exposed bearing screw feeder capable of preload adjustment in the longitudinal direction of the screw shaft.
- a bearing screw conveying apparatus comprising a screw shaft and a nut screwed to the screw shaft, wherein the nut has a rod shape extending in the screw shaft length direction, respectively.
- a plurality of rod-shaped bearing holders disposed at regular intervals in the circumferential direction outside the screw shaft, a plurality of radial bearings disposed below the rod-shaped bearing holders along a helical path that matches the pitch of the screw shaft male thread, and
- the rod bearing holders are achieved by including a pair of spacers that fix both ends of the rod bearing holders to maintain a constant distance with respect to the screw shaft center and to maintain a constant spacing in the circumferential direction of the screw shaft.
- the third object of the present invention is to form female threads on both end faces of the rod-shaped bearing holders, and to each spacer, a holder mounting hole into which the rod-shaped bearing holder tip can be inserted, and an outer side of the holder mounting hole of the spacer. It is achieved by forming a screw hole, and inserting the rod-shaped bearing holder tip into the holder mounting hole of the spacer to fasten the holder fixing screw from the screw hole.
- the third object of the present invention is to penetrate through the holder installation hole through which the rod-shaped bearing holder tip can be inserted into the respective spacers, and form a tab on the inner wall outer portion of the holder installation hole.
- the tab may be achieved by screwing a preload adjusting screw capable of displacing the rod-shaped bearing holder in the longitudinal direction of the screw shaft.
- the shape of the spacer can be modified to fit the equipment to be installed to have a mounting plate function, there is an effect that can be equipped with equipment without a separate mounting plate.
- each rod bearing holder is elastically squeezed in the direction of the screw shaft center by the ring spring, so that the eccentricity with respect to the center of the screw shaft of each rod bearing holder is automatically cautious. have.
- the holder fixing screw or the preload adjusting screw is arranged in parallel with the longitudinal direction of the rod bearing holder, and the holder fixing screw or the preload adjusting screw is properly rotated on both sides of the rod bearing holder, thereby preloading the radial bearings in a constant orientation. Since it can be adjusted in the length direction of the screw shaft, even after the preload adjustment, the radial radius of the radial direction of the screw shaft of the radial bearings does not change, the effect is kept constant. As a result, the preload adjustment of the radial bearing of one bearing does not affect the preload adjustment of the radial bearing of the other bearing, and therefore, the preload of the entire radial bearings on the screw shaft is quickly and easily titrated. The effect can be adjusted with.
- the contact state between the radial bearing and the screw shaft is visually checked from the outside to select only a necessary point, so that the screw shaft center direction or screw is selected.
- Preload can be adjusted precisely in the axial length direction.
- FIG. 1 is an exploded perspective view of a contact exposed bearing screw feeder according to a first embodiment of the present invention.
- FIG. 2 is an exploded perspective view of the rod-shaped bearing holder and the radial bearing used in the first embodiment of the present invention.
- FIG. 3 is an assembled perspective view of the rod-shaped bearing holder and the radial bearing shown in FIG. 2.
- FIG 4 is an assembled perspective view of the contact exposed bearing screw feeder according to the first embodiment of the present invention.
- FIG. 5 is a front sectional view of a contact exposed bearing screw feeder according to a first embodiment of the present invention.
- FIG. 6 is an exploded perspective view of a contact exposed bearing screw feeder according to a second embodiment of the present invention.
- FIG. 7 is an assembled perspective view of the contact exposed bearing screw feeder shown in FIG. 6.
- FIG. 8 is an exploded perspective view of a contact exposed bearing screw feeder according to a third embodiment of the present invention.
- FIG. 9 is an assembled perspective view of the contact exposed bearing screw feeder shown in FIG. 8.
- FIG. 10 is an exploded perspective view of a contact exposed bearing screw feeder according to a fourth embodiment of the present invention.
- FIG. 11 is an assembled perspective view of the contact exposed bearing screw feeder shown in FIG. 10.
- bearing mounting hole 10 bearing seat
- a screw shaft 1 having a male screw 3 formed on an outer circumferential surface thereof and a radial bearing 17 are paired on a helical path corresponding to the male screw 3. It can be seen that it consists of a plurality of rod-shaped bearing holder nuts. A feature of the present invention resides in a rod bearing holder nut.
- the contact exposed bearing screw feeder is a screw shaft (1) having a male screw (3) formed on the outer circumferential surface, and a constant distance along the circumferential direction on the outer circumference of the screw shaft (1) It can be seen that it comprises a plurality of rod-shaped bearing holders 5 arranged at both ends and fixed by spacers 23a.
- a radial bearing 17 is installed below the rod bearing holder 5.
- the nut of the present invention comprises the rod-shaped bearing holder 5, the radial bearing 17 provided below the rod-shaped bearing holder 5, and the spacer 23a for coupling the rod-shaped bearing holders 5 at both ends. .
- Rotational power such as a motor is connected to the screw shaft 1, and a load is connected to the spacer 23a. If necessary, a load may be connected to the screw shaft 1, and rotational power may be connected to the spacer 23a.
- the bearing holder and the nut body are integrally formed.
- the bearing holder is formed in a rod shape or rod-shaped, and arranged in a plurality of at regular intervals around the screw shaft (1) side by side in the longitudinal direction of the screw shaft (1), the screw shaft (1) It is to make satellite movement around each.
- the rod-shaped bearing holders 5 each have a rod shape extending in the direction of the screw shaft 1. Two or more rod-shaped bearing holders 5 are provided, and in particular, it is preferable that they are even numbers paired with each other. These rod-shaped bearing holders 6 are arranged outside the screw shaft 1 at regular intervals in the circumferential direction.
- the spacer 23a is provided at both ends of the rod-shaped bearing holders 5 so that the rod-shaped bearing holders 5 maintain a constant distance with respect to the center of the screw shaft 1 and maintain a constant distance in the circumferential direction of the screw shaft 1. Fix it.
- a radial bearing 17 is coupled to the lower part of the rod-shaped bearing holder 5, and these radial bearings are screwed when the rod-shaped bearing holders 5 are assembled to the screw shaft 1 by the spacer 23a. It is arrange
- the radial bearing 17 is installed such that the outer ring 19 surface is in contact with the upper edge of the thread of the screw shaft 3 or the side of the thread.
- the bearing bearing hole (10) formed at an angle to the lower portion of the rod-shaped bearing holder (5) and at the center of the bearing seat (10) 9) penetrates upward to form.
- the bearing seat 10 is formed so that only a portion of the radial bearing 17 can be inclined inclined, and other portions of the radial bearing 17 which are not recessed protrude out of the bearing seat 10 and protrude. It is preferable to allow the outer ring 19 of the portion to be connected to the screw shaft male screw 3.
- the inclination angle of the bearing seat 10 depends on the structure of the male screw 3 of the screw shaft 1, but in either case, the outer ring of the radial bearing may be connected to the upper edge or side of the thread of the screw shaft male screw 3. It can be sized.
- a tab is formed in the bearing installation hole 9, and a screw coupled to the tab is formed at a portion inserted into the bearing 9 of the rotary shaft 21 to install the rotary shaft 21. It is preferable to screw in the ball 9.
- Screw feeders should be capable of bidirectional feed.
- the rod bearing holders 5 facing each other so that the rod bearing holders 5 can move in both directions by bidirectional rotation of the screw shaft 1 or the spacer 23a.
- the radial bearings 17 installed in the are installed to be in contact with the screw shaft male screw 3 in a state inclined in the opposite direction to each other.
- the radial bearing 17 is fixed to the rod-shaped bearing holder 5 regardless of which direction the screw shaft 1 or the spacer 23a is connected to rotational power to rotate. In rotation is connected to the upper edge or side of the thread of the screw shaft male screw (3) without displacement.
- the bearing screw conveying apparatus has dramatically improved the processability and assemblability of the radial bearing screw conveying apparatus by such a simple structure, and the parts of the bearing screw conveying apparatus by integrally forming the nut body and the bearing holder.
- the number has been reduced to less than half, allowing the bearing screw feeder to be made compact and improving the rigidity of the nut.
- the contact state between the surface of the male screw 3 of the screw shaft 1 and the radial bearing 17 is externally connected through the gap. You can check it with your own eyes.
- Another feature of the contact exposed bearing screw feeder according to the present invention is the position of the radial bearing 17 with respect to the center of the screw shaft 1 by adjusting the height of the rod-shaped bearing holder 5 in the spacer 23a. To be able to control. To this end, an arm 11 that is thinner than the rod-shaped bearing holder body is formed on both ends of the rod-shaped bearing holder 5, and an unperforated groove 15 is formed on the outer side of the arm 11 toward the center of the screw shaft.
- a holder mounting hole 27a in the longitudinal direction of the rod-shaped bearing holder 5 is formed on the inner surface of the spacer 23a, and the arm 11 of the rod-shaped bearing holder 5 is inserted therein, and the spacer A tab 29a penetrated toward the center of the screw shaft 1 is formed outside the holder mounting hole 27a of the 23a, and the tip is inserted into the groove 15 of the arm 11 in the tab 29a. Tighten the holder fixing screw 31a. When the holder fixing screw 31a is tightened more firmly in a state where the bearing screw feeder is assembled while the radial bearing 17 and the screw shaft 1 are properly connected, a rod-shaped rod is installed in the holder mounting hole 27a.
- the bearing holder 5 moves finely toward the center of the screw shaft 1 so that the radial bearing 17 comes into closer contact with the surface of the male screw 3 of the screw shaft 1, and the holder fixing screw 31a Is slightly loosened, the rod-shaped bearing holder 5 installed in the holder mounting hole 27a is finely separated from the center of the shaft screw shaft 1, and the radial bearing 17 surface of the male screw 3 of the screw shaft 1. To be in less intimate contact.
- the precision of machining of the screw shaft male screw 3, the rod-shaped bearing holder 5, the spacer 23a, the radial bearing 17, and the like is poor, so that the radial bearing 17 is screw shaft even after assembly.
- the preload can be corrected afterward when the preload is not properly connected to the external thread (3), and when the backlash occurs due to the collision, friction, vibration, heat generation between components in the screw feeder and the radial bearing (17) It is possible to correct the backlash by adjusting the gap and preload between the screw shaft male screw (3).
- the outer structure of the spacer 23a is not limited to the cylindrical shape, and may be variously modified to fit the equipment in which the present invention is installed. In this case, it is possible to directly attach the transfer apparatus according to the present invention to various equipment without attaching a separate mounting plate.
- the rod-shaped bearing holder 5 is temporarily eccentric with respect to the center of the screw shaft 1, and is automatically cautious in the case of satellite motion, thereby allowing the center line and the rod-shaped bearing of the screw shaft 1 to rest.
- the satellite movement center line of the holder 5 is matched.
- the present invention has a neck whose diameter is thinner than the other part of the arm 11 in the groove 11 on the arm 11 of the rod-shaped bearing holder 5. (neck) 13, the arm 13 of all rod-shaped bearing holders 5 arranged around the screw shaft 1, in the neck 13 to accommodate the elastic force in the center of the screw shaft (1) It is provided with a ring spring 33 that can provide.
- the ring spring 33 is inserted and installed outside the rod-shaped bearing holders 5, and its inner diameter is such that the radial bearing 17 can be connected to the screw shaft 1 with an appropriate preload in a normal state. to be.
- the feature of the second to fourth embodiments of the present invention is the screw shaft of the rod-shaped bearing holders 5a and 5b while visually confirming the contact state between the external thread 3 surface and the radial bearing 17 from the outside.
- the displacement in the longitudinal direction makes it possible to adjust the contact preload between the male screw 3 of the screw shaft 1 and the radial bearing 17.
- the second embodiment according to the present invention also includes a screw shaft 1 having a male screw 3 formed on an outer circumferential surface thereof, and a rod-shaped bearing holder nut screwed to the screw shaft 1.
- the rod bearing holder nut comprises radial bearings 17 supported by rod bearing holders 5a and 5b.
- Two or more rod-shaped bearing holders 5a and 5b are provided, and as will be described later, all the rod-shaped bearing holders 5a and 5b may have a pair disposed in opposite directions about the screw shaft 1. It is preferable that even numbers are provided.
- the longitudinal direction of the rod-shaped bearing holders 5a and 5b coincides with the longitudinal direction of the screw shaft 1, and spaces the screw shaft 1 around the screw shaft 1 at regular azimuth intervals. Is placed. Accordingly, the radial bearings 17 provided in the same rod bearing holders 5a and 5b all maintain the same azimuth angle with respect to the center on the screw shaft 1. In addition, the radial bearings 17 provided in the rod-shaped bearing holders 5a and 5b are spaced apart so that each is arranged on a helical path corresponding to the male screw 3 of the screw shaft 1.
- the rod-shaped bearing holders 5a and 5b are fixed at both ends by spacers 23d so as to be arranged at regular intervals along the circumferential direction at the outer circumference of the screw shaft 1 and to maintain a constant interval.
- the screw feed device each having a rod shape extending in the screw axis direction and arranged at regular intervals in the circumferential direction outside the screw shaft
- a plurality of radial bearing holders 5a and 5b and a plurality of radial bearings 17 installed below the rod bearing holders 5a and 5b along a helical path adapted to the pitch of the screw shaft male screw 3; Both ends of the rod bearing holders 5a and 5b are maintained at a constant distance with respect to the center of the screw shaft 1 and at regular intervals in the circumferential direction of the screw shaft 1.
- the spacer 23d to be fixed is included.
- Radial bearings 17 are coupled to the lower end of the rod-shaped bearing holders 5a and 5b, and the radial bearings 17 are formed by screw rods of the rod-shaped bearing holders 5a and 5b by the spacer 23d.
- the spacer 23d When assembled to 1) it is arranged so as to engage with the spiral path of the male screw (3) formed on the screw shaft (1). That is, the plurality of radial bearings 17 installed in line with each of the rod-shaped bearing holders 5a and 5b in the state where the rod-shaped bearing holders 5a and 5b are coupled by the spacer 23d are connected to the screw shaft 1. It is placed on the helical path matching the pitch of the external thread (3).
- the radial bearing 17 must have its outer ring 19 surface connected to the threaded upper edge or threaded side of the screw shaft male screw 3.
- lower portions of the rod-shaped bearing holders 5a and 5b are chamfered to form a flat surface 14, and the inclined bearing seat 10 is provided at the radial bearing 17 installation point.
- the bearing seat 10 is formed at the center of the bearing seat 10 so as to penetrate the bearing installation hole 9 perpendicular to the upper part.
- the bearing seat 10 is formed so that only a portion of the radial bearing 17 can be inclined inclined, and other portions of the radial bearing 17 which are not recessed protrude out of the bearing seat 10 and protrude.
- the outer ring 19 of the cut portion is connected to the screw shaft male screw 3.
- the inclination angle of the bearing seat 10 depends on the structure of the male screw 3 of the screw shaft 1, but in any case, the outer ring 19 of the radial bearing 17 is the upper edge of the thread of the screw shaft male screw 3; It is sized to connect to side.
- a tab is formed in the bearing installation hole 9, and a screw coupled to the tab is formed at a portion inserted into the bearing 9 of the rotary shaft 21 to install the rotary shaft 21. It is preferable to screw in the ball 9.
- the radial bearings 17 are installed inclined in the opposite direction. That is, the installation direction of the radial bearing 17 provided in the rod-shaped bearing holder code
- the radial bearings 17 installed in the rod bearing holder designation 5a are used only when the nut moves to the right relative to the screw shaft 1, wherein the radial bearings 17 installed in the rod bearing holder designation 5a are The screw shaft rotates while being in contact with the left wall or the upper left corner of the male screw 3.
- the radial bearings 17 installed in the rod bearing holder symbol 5b are used only when the nut moves to the left relative to the screw shaft 1, and the radial bearings 17 installed in the rod bearing holder symbol 5b are The screw shaft rotates while being in contact with the right wall or the upper right corner of the male screw 3.
- the rod-shaped bearing holders 5a and 5b are moved in the longitudinal direction of the screw shaft 1 while visually confirming a contact state between the external surface of the male screw 3 and the radial bearing 17 from the outside.
- both sides of the rod-shaped bearing holders 5a and 5b both sides of the rod-shaped bearing holders 5a and 5b.
- a female screw 12 is formed in the longitudinal section, and a holder mounting hole 27c into which the ends of the rod-shaped bearing holders 5a and 5b can be inserted is formed in each spacer 23d, and the holder mounting hole 27c of the spacer is formed.
- a screw hole 43 is formed on the outside, and the ends of the rod-shaped bearing holders 5a and 5b are inserted into the holder mounting hole 27c of the spacer 23d, and the holder fixing screw 31b from the screw hole 43 is formed. ) Is fastened to the female screw 12 of the rod-shaped bearing holders 5a and 5b. At this time, the preload adjustment in the longitudinal direction of the screw shaft 1 can be performed by tightening or loosening the holder fixing screw 31b on both sides of the rod-shaped bearing holders 5a and 5b.
- the female thread 12 of the rod-shaped bearing holders 5a and 5a is slightly eccentrically formed at the center of the rod-shaped bearing holders 5a and 5b, and the screw hole 43 of the spacer 23d is also formed by the holder mounting hole 27c.
- the amount of eccentricity of the female screw is eccentrically formed at the center.
- FIGS. 8 and 9 show a third embodiment of the present invention.
- the third embodiment of the present invention penetrates through the holder installation hole 27b into which the tip ends of the rod-shaped bearing holders 5a and 5b can be inserted into the spacer 23b.
- a tab 29b is formed on a portion of the inner wall of the holder mounting hole 27b to a predetermined depth, and the rod-shaped bearing holders 5a and 5b are attached to the tab 29b of the holder mounting hole by the screw shaft 1.
- Screw the preload adjusting screw 39 which can be pushed in the longitudinal direction.
- the holder installation holes 27b of the spacer 39 are formed at regular intervals by the number of rod-shaped bearing holders 5a and 5b installed.
- the tip outer diameter of the rod-shaped bearing holders 5a and 5b is smaller than the inner diameters of the holder mounting hole 27b and the tab 29b, and a part of the tip of the rod-shaped bearing holders 5a and 5b is assembled in the holder. Assemble so that it progresses inside the tab 29b of the ball.
- the preload adjusting screw 39 it is preferable to use a stop screw with a driver groove 37. In the state in which the preload adjusting screw 39 is engaged, the side end surfaces of the rod-shaped bearing holders 5a and 5b contact the inner surface of the preload adjusting screw 39.
- the preload adjusting screw 39 is tightened to move inward to the holder mounting hole 27b.
- the rod-shaped bearing holders 5a and 5b provided are finely moved in the longitudinal direction of the screw shaft 1 so that the radial bearing 17 comes into closer contact with the surface of the male screw 3 of the screw shaft 1, and the screw ( 31b) is slightly loosened, the rod-shaped bearing holders 5a, 5b provided in the holder mounting hole 27b are finely separated from the center of the shaft screw shaft 1, and the radial bearing 17 is a male screw of the screw shaft 1. (3) Less intimate contact with the surface.
- the preload adjusting screw 39 When the preload adjusting screw 39 is used, the radial accuracy of the screw shaft male screw 3, the rod-shaped bearing holders 5a and 5b, the spacer 23b, the radial bearing 17, and the like decreases, and thus the radial bearing remains after assembly.
- (17) fails to connect to the screw shaft male screw 3 with a suitable preload, the preload can be corrected afterwards, and if the backlash occurs due to collision, friction, vibration, heat generation, etc., between the components of the screw feeder, By adjusting the gap and preload between the ear bearing 17 and the screw shaft male screw 3, it is possible to correct the backlash.
- the preload adjusting screw 39 is arranged in parallel with the longitudinal direction of the rod-shaped bearing holders 5a and 5b, and rotates the preload adjusting screw 39 to screw the preload of the radial bearings 17 in the same orientation. Since the shaft 1 can be temporarily adjusted in the longitudinal direction, the idle radius of the radial bearings 17 with respect to the center of the screw shaft of the radial bearings 17 remains constant without changing, thereby preloading the radial bearing in one orientation. The adjustment does not affect the preload adjustment for the radial bearings of other bearings, and therefore, the preloading of the entire radial bearings on the screw shaft can be carried out quickly and easily, as well as the occurrence of friction or joint after preload adjustment. It can be minimized.
- 10 and 11 show a fourth embodiment of the present invention.
- 8 and 9 illustrate a case in which the preload adjusting screws 39 are provided at both ends of all the rod-shaped bearing holders 5a and 5b, but it is not necessary to do so. none.
- the preload adjusting screw 39 may be provided only at one end of the rod bearing holders 5a and 5b, and the rod bearing holders 5a and 5ax.
- the preload adjusting screw 39 may be provided only in the remaining bar bearing holders 5a and 5b except for the bar bearing holder 5ax first assembled to the spacer 23b.
- the ends of the rod-shaped bearing holders 5a and 5b may be fixed to the spacer 23b only by the preload adjusting screw 39, but for a more secure fixing,
- a female screw 12 is formed on both end surfaces of the rod-shaped bearing holder, and a screw hole 35 is formed in the preload adjusting screw 39. Then, the holder fixing screw 31b is screwed into the preload adjusting screw. It is preferable to penetrate to the female screw 12 of the rod-shaped bearing holder.
- the female screw 12 is eccentrically formed at the center of the rod-shaped bearing holder, and the screw hole 35 is eccentrically formed at the center of the preload adjusting screw, the rotation of the rod-shaped bearing holders 5a and 5b can be prevented.
- the female screw 12 formed in the longitudinal section of the rod-shaped bearing holders 5a, 5ax, and 5b is also eccentrically as much as the screw hole 43 of the spacer 23c at the center of the rod-shaped bearing holders 5a, 5ax, and 5b.
- the eccentric formation of the female screw 12 and the screw hole 43 is for preventing the rod-shaped bearing holders 5a, 5ax, and 5b from rotating during use of the present invention.
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Abstract
Description
Claims (6)
- 스크류축과, 상기 스크류축에 나사 결합되는 너트로 이루어진 베어링 스크류 이송 장치에 있어서,상기 너트는, 각각 스크류축 길이 방향으로 연장된 막대 형상을 가지며 상기 스크류축 외측에 원주 방향으로 일정한 간격을 두고 배치된 다수의 봉상 베어링 홀더와, 상기 봉상 베어링 홀더들 하부에 상기 스크류축 수나사의 피치에 맞는 헬리컬 경로를 따라 설치된 복수개의 레이디얼 베어링과, 상기 봉상 베어링 홀더들이 스크류축 중심에 대하여 일정한 거리를 유지하고 스크류축 원주 방향으로 일정한 이격 간격을 유지하도록 상기 봉상 베어링 홀더들의 양단을 고정하는 한 쌍의 스페이서를 포함하여 구성된 것을 특징으로 하는 컨택 노출형 베어링 스크류 이송장치.
- 제 1 항에 있어서,상기 봉상 베어링 홀더 양단에는 봉상 베어링 홀더 몸체보다 가는 아암을 형성하고, 이 아암의 외측에는 스크류축 중심 방향으로 향하는 요홈을 형성하며, 상기 스페이서의 내측면에는 봉상 베어링 홀더 길이 방향의 홀더 설치공을 형성하여 이 곳에 상기 봉상 베어링 홀더의 아암을 삽입 설치하고, 상기 스페이서의 홀더 설치공 외측에는 스크류축 중심 방향으로 향하여 관통된 탭을 형성하여 이 탭에 상기 아암의 요홈에 선단이 삽입되는 나사를 체결한 것을 특징으로 하는 컨택 노출형 베어링 스크류 이송장치.
- 제 2 항에 있어서, 상기 봉상 베어링 홀더의 아암에는 상기 요홈 내측으로 지름이 상기 아암의 다른 부분보다 가는 넥(neck)을 형성하고, 상기 넥에, 스크류축 주위에 배치된 모든 봉상 베어링 홀더의 아암을 수용할 수 있는 내경을 가진 링스프링을 외측에서 삽입 설치한 것을 특징으로 하는 컨택 노출형 베어링 스크류 이송장치.
- 제 1 항에 있어서,상기 봉상 베어링 홀더 양측 종단면에는 암나사를 형성하고, 상기 각 스페이서에는 상기 봉상 베어링 홀더 선단이 삽입될 수 있는 홀더 설치공을 형성하고, 상기 스페이서의 홀더 설치공 외측으로는 나사공을 형성하고, 상기 봉상 베어링 홀더 선단을 상기 스페이서의 홀더 설치공에 삽입하여 상기 나사공으로부터 홀더고정나사를 체결한 것을 특징으로 하는 컨택 노출형 베어링 스크류 이송장치.
- 제 1 항에 있어서,상기 각 스페이서에는 상기 봉상 베어링 홀더 선단이 삽입될 수 있는 홀더 설치공을 관통 형성하고, 상기 홀더 설치공의 내벽 외측 일부에는 탭을 형성하며, 상기 홀더 설치공의 탭에는 상기 봉상 베어링 홀더를 스크류축 길이 방향으로 변위시킬 수 있는 예압조절나사를 나사 체결한 것을 특징으로 하는 컨택 노출형 베어링 스크류 이송장치.
- 제 5 항에 있어서,상기 봉상 베어링 홀더 양측 종단면에는 암나사를 형성하고, 상기 예압조절나사 중심에는 나사공을 형성하며, 홀더고정나사를 상기 예압조절나사의 나사공을 관통하여 상기 봉상 베어링 홀더의 암나사에 체결한 것을 특징으로 하는 콘택 노출형 베어링 스크류 이송장치.
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KR101478061B1 (ko) * | 2013-02-25 | 2015-01-02 | 주식회사 만도 | 너트 스크류 이송장치 |
WO2016091290A1 (en) | 2014-12-09 | 2016-06-16 | Aktiebolaget Skf | Planetary roller screw mechanism |
KR102037482B1 (ko) * | 2018-03-08 | 2019-10-28 | 주식회사 위너 | 베어링 스크류 이송 장치 |
CN109099128A (zh) * | 2018-10-17 | 2018-12-28 | 深圳盛世电梯股份有限公司 | 一种轴承螺杆传动系统 |
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