TWI391585B - Error-compensating bearing screw conveying device - Google Patents

Description

Bearing screw conveying device with compensation error

The present invention relates to a screw conveying device using a radial bearing. Specifically, the present invention relates to a screw conveying device that rotates a screw shaft or a nut in combination with a screw shaft and a nut so as to be linearly moved by a nut or a starting member of the nut, and rotates the internal thread of the inner surface of the nut at a regular position. When compensating between the radial bearing and the screw shaft screw, it is easy to compensate for these compensation error type bearing screw conveying devices.

The screw conveying device that uses the screw shaft and the nut to rotate the screw shaft so that the nut or the nut of the coupling nut moves linearly mainly uses a ball screw conveying device. The ball screw conveying device forms a spiral inner circumferential groove (14) on the inner surface of the nut (13), and a spiral outer circumferential surface (12) on the outer surface of the screw shaft (11), the inner circumferential groove (14) and the outer circumference Inserting a plurality of steel balls (10) between the faces (12), and converting the rotational force of the screw shaft (11) into a nut (13) in a state of reducing friction between the screw shaft (11) and the nut (13) Linear motion. Fig. 1 is a longitudinal cross-sectional view showing a deflector type ball screw conveying device provided with a return piece for circulating an inner ball. Figure 2 is a cross-sectional view of the ball screw conveyor of Figure 1. As shown in Fig. 1 and Fig. 2, a nut (13) for forming a spiral inner circumferential surface groove (14) is provided outside the screw shaft (11) so as to oppose the outer circumferential groove (12) of the screw shaft. A plurality of steel balls (10) are inserted between the outer circumferential groove (12) and the inner circumferential groove (14) of the mutually opposite semicircular cross section, and the ball (10) is placed on the inner side of the nut (13). form Return (18). Symbol 17 is the portion of the loop ball (10). According to such a configuration, when the rotational force outside the ball screw conveying device is transmitted to the screw shaft (11) and rotated, the inner ball (10) rotates along the outer circumferential surface groove (12) and the inner circumferential surface groove (14), Push out the nut (13) in the direction of the screw shaft (11) or combine the starter and re-circulate through the return member (18).

However, such a conventional ball screw conveying device has a complicated structure and is difficult to process. Machining error between the ball (10) and the ball (10), between the ball (10) and the outer circumferential groove (12) of the screw shaft, and between the ball (10) and the inner groove (14) of the nut (13) When there is a gap in the wear and tear, the parts collide and the vibration and noise occur. Such vibration and noise damage parts, and in linear motion machines using ball screw conveyors, it is often the reason for repairing or replacing the ball screw conveyor or its parts.

The present invention has been made to solve the above problems of the conventional ball screw conveying device, and an object thereof is to provide a structure which is simple in structure and minimizes a conflict between the screw shaft and the nut, and completely cuts off the components in the conveying device which linearly moves, and is minimal. Compensation error type bearing screw conveying device for vibration, noise and parts damage.

Another object of the present invention is to provide a gap between the parts due to a decrease in the precision of the part processing, and to compensate for the wear when the wear occurs due to the friction between the radial bearing and the screw. Therefore, the compensation error type bearing screw conveying device which generates noise, vibration, heat generation, backlash, etc. due to the collision between the parts is eliminated.

Another object of the present invention is to provide easy to compensate for the gap between the radial bearing and the screw and the abutment when noise, vibration, heat generation, backlash, etc. occur due to friction between the radial bearing and the screw due to long-term use. Force (preload), which eliminates the compensation error type bearing screw conveying device such as noise, vibration, heat generation, and backlash.

Another object of the present invention is to provide a compensation error type bearing screw conveying device that linearly moves a rotary motion of a screw shaft without loss and is precisely converted into a nut.

In order to achieve the above object, a compensating error type bearing screw conveying device according to the present invention is characterized in that it comprises a screw shaft forming a screw on an outer circumferential surface; the screw shaft is inserted inside and on the outer circumferential surface along a path conforming to the screw spiral a nut body forming a plurality of mounting holes; a radial bearing disposed on the mounting hole of the nut body and having an outer wheel adjacent to the outer surface of the screw shaft of the screw shaft, and rotating at a regular position when the screw shaft or the nut body rotates; The upper portion of the radial bearing is a position adjuster that adjusts the position of the radial bearing toward the center of the screw shaft.

The position adjuster may include a support frame formed at a lower end of the nut body mounting hole, a spring inserted in the mounting hole and provided at an upper portion of the support frame, inserted in the mounting hole and disposed at an upper portion of the spring to fix a radial bearing below a fixing device for the rotating shaft, a screw that is coupled to the upper portion of the fixing device inserted into the mounting hole, and which presses the fixing device in the spring direction, and adjusts the height of the screw shaft in the center direction of the fixing device according to the screw tightening degree .

And, the position adjuster is formed at a lower end of the nut body mounting hole a support frame, a spring inserted in the mounting hole and disposed on the upper portion of the support frame, a screw groove inserted in the mounting hole and provided on the upper portion of the spring and inserting a rod pin, and a radial bearing fixed on the lower side a holder for the rotating shaft, a pin hole penetrating through the upper portion of the mounting hole in the longitudinal direction of the screw shaft, and a screw groove inserted into the pin hole and the retainer, and adjusting a screw shaft center direction of the retainer according to a diameter inserted in the screw groove portion High compensation pin.

Hereinafter, examples of the invention will be described in detail with reference to the accompanying drawings.

3 to 9 are compensation error type bearing screw conveying devices according to a first example of the present invention. 10 to 20 are compensation error type bearing screw conveying devices according to a second example of the present invention. A compensating cap (800) is used as the position adjuster for the radial bearing in the first example, and a compensating pin (900) is used as the position adjuster for the radial bearing in the second example.

Figure 3 is an exploded perspective view of a compensation error type bearing screw conveying device according to a first example of the present invention. Figure 4 is a longitudinal sectional view of a compensation error type bearing screw conveying device according to a first example of the present invention. Figure 5 is a cross-sectional view of a compensation error type bearing screw conveying device in accordance with a first example of the present invention. Figure 6 is a perspective view of a holder of a first example of the present invention. Figure 7 is a partial cross-sectional view illustrating the relationship of a compensating cap, a retainer, a radial bearing, and a screw. Figure 8 is a longitudinal sectional view showing a conveying action of a compensation error type bearing screw conveying device according to a first example of the present invention. Figure 9 is a partial cross-sectional view showing the relationship between the compensation cap, the holder, the radial bearing, and the screw when the cross-sectional shape of the screw of the first example of the present invention is triangular.

3 to 5, a compensating error type bearing screw conveying device according to the present invention may include a screw shaft (200) which forms a screw (210) on an outer circumferential surface, and a cylindrical shape in which the above-mentioned screw shaft (200) is inserted Nut body (300). The screw shaft (200) is connected to a rotary power such as a motor, and the nut body (300) is connected to the starter. The screw shaft (200) can be fixed as needed, and the nut body (300) can be connected to the rotary power and the starting member. In particular, when the length of the screw shaft (200) is somewhat long, the nut body (300) is not linearly moved by the external power rotating screw shaft (200), but the nut body (300) is rotated by external power while moving linearly on the fixed screw shaft. The efficiency on (200) is better. In the example of the present invention, an example in which the nut body (300) is linearly moved by the external power rotating screw shaft (200) is mainly described, but the present invention is not limited to these. The above description is of course applied to an example in which the nut body is rotated by external force to rotate the nut body while linearly moving on the fixed screw shaft (200).

One of the features of the compensating error type bearing screw conveying device according to the present invention is that a screw (210) thread path and an engaging path are formed along the screw shaft (200) on the outer circumferential surface of the nut to form a plurality of mounting holes (310). A radial bearing (500) that rotates by connecting the rotating shaft (600) is provided in the mounting hole (310). As shown in Fig. 4, at this time, the outer ring surface of the radial bearing (500) abuts the threaded or threaded side of the screw (210). Thereby, a nut internal thread that meshes with the external thread of the above-described screw shaft (200) is formed. At this time, in order to rotate in accordance with the above-described rotation of the screw shaft (200), the nut body (300) can be moved in both directions, and half of the plurality of radial bearings (500) are the screw shaft (200) rotated only in the clockwise direction. Adjacent to the screw (210), the remaining half is the abutment screw (210) when the screw shaft (200) is rotated only in the counterclockwise direction. Thus, the above snail The shaft (200) is rotated in any direction and the nut body (300) is moved in any direction. The radial bearing (500) is not displaced at a regular position, adjacent to the angle or side of the thread of the screw (210), and only Rotate.

According to the screw conveying device of the present invention, according to such a simple structure, not only the friction between the screw shaft (200) and the nut body (300) but also the collision between the parts in the conveying device for linear movement is completely cut off, Minimize vibration, noise and damage to radial bearings.

According to the compensation error type bearing screw conveying device of the present invention, in another feature, when the radial bearing (500) is coupled to the rotating shaft (600) and provided in the mounting hole (310) of the nut body (300), the pair can be adjusted. Radial bearing (500) The position of the center of the screw shaft (200). To this end, the compensating error type bearing screw conveying device according to the present invention is provided with a position adjuster of a radial bearing (500). The position adjuster is such that the machining precision of the screw (210), the nut body (300), the mounting hole (310), the rotating shaft (600), the radial bearing (500), etc. is lowered, and the radial bearing needs to be compensated after assembly. (500) Adjusting the radial bearing (500) when the phenomenon of abutting the screw (210) is not properly pre-stressed, or when noise, vibration, heat generation, backlash, etc. occur due to conflict and friction between the parts of the screw conveying device The gap between the screw and the screw (210) is pre-stressed and corrected.

Referring to FIGS. 3, 6, and 7, a position adjuster according to a first example of the present invention includes a support frame (360) formed at a lower end of a mounting hole (310) of a nut body (300), inserted into the mounting hole (310), and a spring (700) provided on an upper portion of the support frame (360), a holder inserted in the mounting hole (310) and provided on an upper portion of the spring (700) to fix a rotating shaft of the radial bearing (500) downward (400) And using a screw with the upper portion of the above-mentioned holder (400) inserted in the above-mentioned mounting hole (310) The wire is combined and the above-mentioned holder (400) is pressed in the direction of the spring (700), and the compensation cap (800) of the height of the screw shaft in the center direction of the holder (400) is adjusted according to the degree of screw tightening.

The holder (400) can be moved up and down within the mounting hole (310). For these purposes, when the mounting hole (310) is cylindrical, the holder (400) is in the form of a cylindrical shape that is inserted into the mounting hole (310) and movable. Further, the lower portion of the body (410) of the holder has a smaller diameter than the upper outer diameter, and preferably has a step difference between the upper and lower sides. The spring (700) is inserted into the lower portion of the body (410) of the small outer diameter holder, and the step is stopped.

A shaft hole (420) for fixing a rotating shaft (600) of the radial bearing (500) is formed at a lower portion of the holder (400). The shaft hole (420) is provided with a tap, and is inserted into a portion of the shaft hole (420) of the rotating shaft (600) to form a screw that is combined with the screw tapping, and the rotating shaft (600) is screwed to the shaft hole ( 420) is better.

The lower portion of the holder (400) described above forms a bearing pad (430) that is obliquely recessed into a portion of the radial bearing (500). A part of the radial bearing (500) is inserted into the bearing pad (430), and the remaining portion of the outer ring abuts the screw (210). At this time, the inclination angle of the bearing pad (430) is different according to the structure of the screw (210) of the screw shaft (200), but in any case, the outer wheel of the radial bearing also forms a certain angle of inclination for abutting the taper or the side of the screw (210). . Further, at this time, the shaft hole (420) is formed on the floor surface of the bearing pad (430), and the direction thereof is perpendicular to the floor surface. Thus, the mounting hole (310) is perpendicular to the length of the screw shaft (200) and the radial bearing (500) can remain tilted. The mounting angle of the radial bearing (500) can also be changed by simply replacing the holder (400).

As shown in FIG. 3 and FIG. 6, the protrusion (440) is on the above fixer (400). The lower portion of the body is integrally formed, and a brake groove (320) into which the protrusion (440) is inserted is formed on the support frame (360) at the lower end of the mounting hole (310) to be inserted into the radial bearing of the holder (400) (500) ) Always fixed in a certain direction.

The lower end of the spring (700) is adjacent to the upper surface of the support frame (360), and the upper end is clamped into the lower portion of the body (410) of the holder.

As shown in Fig. 7, the compensating cap (800) has an external thread formed on the outer surface thereof, and an inner thread that is coupled to the outer thread of the compensating cap (800) is also formed on the inner surface of the upper portion of the mounting hole (310).

According to the position adjuster of the first example of the present invention structured as described above, the user, as shown in Fig. 7, occurs between the screw (210) and the radial bearing (500) due to machining errors of parts or wear of parts during use. When the isolation phenomenon and compression force are too large or the preload is not appropriate, move the compensation cap (800) down or above. Then, the above fixer (400) overcomes the rebound force of the spring (700) or the support of the rebound force at the lower portion of the compensation cap (800), and moves down or above. Therefore, it is easy to adjust the gap and preload between the screw (210) and the radial bearing (500) without disassembling the integral screw conveying device.

8 is a compensation error type screw conveying device (100a) for adjusting the gap between the screw (210) and the radial bearing (500) according to the compensation cap (800) and preloading, and feeding the nut to the left and right according to the rotation of the screw shaft (200). Body (300). The radial bearing (500) converts the rotational motion of the screw shaft (200) into a linear motion of the nut without loss and precision.

The screw cross-sectional shape of the screw shaft (200) of the compensation error type screw conveying device according to the first example of the present invention is as shown in Figs. 3 to 8, and is applicable not only to a semicircular groove but also as shown in Fig. 9, a triangle, Ladder shape and other shapes The shape is also directly applicable. As shown in Fig. 9, when the cross-sectional shape of the screw is triangular, the radial bearing (500) preferably abuts the side of the screw thread. At this time, the high-speed rotating screw shaft (200) also has good abutment between the screw (210) and the radial bearing (500), and the noise is small, and the supporting force in the axial direction is increased, thereby safely conveying the nut body (300).

Figure 10 is an exploded perspective view of a compensation error type bearing screw conveying device according to a second example of the present invention. Figure 11 is a longitudinal sectional view of a compensation error type bearing screw conveying device according to a second example of the present invention. Figure 12 is a cross-sectional view of a compensation error type bearing screw conveying device in accordance with a second example of the present invention. Figure 13 is a perspective view of a holder used in a second example of the present invention. Figure 14 is a partial cross-sectional view illustrating the relationship of the compensation pin, the retainer, the radial bearing, and the screw. Figure 15 is a partial cross-sectional view illustrating the relationship between the compensation pin diameter and the position of the holder. Figure 16 is a longitudinal sectional view showing a conveying action of a compensation error type bearing screw conveying device according to a second example of the present invention. Figure 17 is a longitudinal sectional view showing the independent installation of the compensation pin for each radial bearing of the compensation error type bearing screw conveying device according to the second example of the present invention. 18a and 18b are partial cross-sectional views showing the radial bearing and the screw connecting method in the case where the cross-sectional shape of the screw of the second example of the present invention is trapezoidal. 19 and 20 are longitudinal sectional views showing an additional lubricating oil storage tank mounted on a compensation error type bearing screw conveying device according to a second example of the present invention.

As shown in FIGS. 10 and 14, a position adjuster according to a second example of the present invention includes a support frame (360) formed at a lower end of a mounting hole (310) of a nut body (300), and is inserted into the mounting hole (310). a spring (700) on an upper portion of the support frame (360), inserted in the mounting hole (310), and disposed on the spring (700) a screw groove (450) into which an upper rod is insertable and a rod-shaped pin is formed thereon, and a holder (400) for fixing a rotating shaft (600) of the radial bearing (500) is bored therethrough, and penetrates the length direction of the screw shaft (200) a pin hole (350) at an upper portion of the mounting hole (310), and a screw groove (450) inserted into the pin hole (350) and the fixing device (400), and a fixing adjuster according to a diameter inserted in a portion of the screw groove (450) ( 400) The compensation pin (900) of the screw shaft (200) in the center direction height.

The compensation pin (900) is first inserted into the nut body (300) by inserting the spring (700) and the retainer (400) of the radial bearing (500) into the mounting hole (310), and inserting the nut body from the side of the nut body (300). ) The pin hole (350) and the screw groove (450) above the holder. As shown in FIGS. 10 to 12, when the position compensation amounts of the respective radial bearings (500) are the same, a plurality of mounting holes provided in the longitudinal direction of the screw shaft (200) are pressed by a compensation pin (900) having a sufficiently long length. The holder (400) on (310). However, as shown in Fig. 17, when the machining error or the degree of wear differs from each other, and the position compensation amount of the radial bearing (500) is different, the compensation pin (900a) is slightly larger than the screw groove (450) of the holder (400). The lengths are different so that each of the holders (400) is separately mounted, and the compensation pin can be inserted into the gap between the compensation pins (900a).

Referring to Figures 10 and 13, a position adjuster according to a second example of the present invention uses a compensating pin (900) instead of a compensating cap (800) as a compensating error tool, unlike the position adjuster according to the first example of the present invention. A screw groove (450) is formed on the holder (400), and a pin hole (350) is formed in the nut body (300).

Although not shown, the overall length of the compensation pin (900) or the compensation pin (900a) and the auxiliary pin is shorter than the length of the nut body (300), so that the pin hole (350) is not filled with both side ends, and it is not filled. The part is attached to the screw and the compensation pin (900) is fixed.

According to the position adjuster of the second example of the present invention, since the compensation amount is adjusted by the diameter of the compensation pin (900), the compensation error is fine. Referring to Figures 14 and 15, when the diameter of the compensation pin (900) is increased, the holder (400) and the rotatable radial bearing (500) are lowered. When the diameter of the compensation pin (900) is reduced, the above-mentioned holder (400) and the radial bearing (500) rise according to the elastic force of the spring (700). At this time, the support frame (360) and the spring (700) continue to provide an upward elastic supporting force to the holder (400).

Specifically, as shown in FIG. 15, when the holder (400) is sandwiched between the pin hole (350) of the nut body (300) and the screw groove (450) of the holder (400), the holder (400) is based on the spring. (700) rebounded to the upper part by the elastic force. The compensation pin (900) sandwiched in the screw groove (450) of the above holder (400) is also pressurized in the upward direction, at which time a part of the compensation pin (900) is inserted into the pin hole (350) to be caught. Therefore, when the diameter of the compensation pin (900) is large, the small diameter compensation pin (900) is inserted, the holder (400) is pressed downward by the difference in diameter, and the radial bearing (500) is centered toward the screw shaft (200). Direction shift. By these compensations for the amount of wear due to machining errors and friction, the screw (200) and the radial bearing (500) are adjacent to each other with an appropriate preload.

Therefore, the radial bearing (500) has less noise than the ball screw during the abutment of the screw, and a precise conveying distance is obtained. Further, when the preload is lowered due to wear of the radial bearing (500) or the like, the integral screw conveying device is not decomposed and the error is quickly compensated.

Figure 16 is a compensation error type screw conveying device (100a) for adjusting the gap between the screw (210) and the radial bearing (500) according to the compensation pin (900) and preloading, and rotating the nut by the rotation of the screw shaft (200). Figure of the body (300). Above The radial bearing (500) converts the rotational movement of the screw shaft (200) without loss and precision into a linear motion of the nut. Further, when the radial bearing (500) abuts the screw (200) and wears for a long time and wears, the radial bearing (500) adjacent to the screw (200) is lowered in preload to cause a gap. This causes conflicts between the adjacencies and problems such as noise, vibration, heat generation, and backlash. At this time, the compensation hole (900) of the larger diameter is clamped into the pin hole (350) of the nut body (300), and the front small diameter compensation pin (900) is disengaged from the pin hole (350) of the nut body (300). And the screw groove (450) of the holder (400). When the pin hole (350) of the nut body (300) and the screw groove (450) of the holder (400) are inserted into the larger diameter compensation pin (900), the compensation pin (900) is increased in accordance with the increased diameter. The holder (400) is pressed to eliminate conflicts between parts and noise, vibration, heat generation, backlash and the like.

The screw cross-sectional shape of the screw shaft (200) of the compensating error type screw conveying device according to the second example of the present invention is as shown in Figs. 10 to 17, and is applicable not only to a semicircular groove but also as shown in Figs. 18a and 18b. Other shapes such as triangles and ladders are also directly applicable. When the screw cross-sectional shape is a ladder shape, as shown in Fig. 18a, the radial bearing (500) preferably abuts the side of the screw thread. At this time, the high-speed rotating screw shaft (200) also has good abutment between the screw (210) and the radial bearing (500), and the noise is small, and the supporting force in the axial direction is increased, thereby safely conveying the nut body (300). However, when the screw shaft (200) is not rotated at a high speed, as shown in Fig. 18b, the radial bearing may be adjacent to the threaded angle of the screw (210).

According to the compensation error type screw conveying device of the present invention, as shown in Fig. 12, a communication mounting hole (310) is formed on the nut body (300) and is oriented to the radial axis. The friction portion of the bearing (500) and the screw (200) supplies the lubricating oil supply hole (370) of the lubricating oil. Further, as shown in FIGS. 19 and 20, in order to communicate the lubricating oil supply hole (370), a lubricating oil storage tank (1000) is provided outside or inside the nut body (300). When the lubricating oil storage tank (1000) is provided inside the nut body (300), as shown in Fig. 20, a radial bearing (500) is inserted into the mounting hole (310) at both ends of the nut body (300), and the intermediate mounting hole is inserted. A lubricant storage box (1000) is installed. These are used to improve the frictional portion of the screw (210) and the radial bearing (500) and to reduce wear.

Industrial applicability

According to the invention as constructed as described above, the structure is simple and the friction between the screw shaft and the nut is minimized. When performing linear motion, the conflict between the parts inside the conveyor is completely cut off, and vibration, noise and damage of parts are minimized. Moreover, these wears are also compensated for when there is a gap between the parts due to a decrease in the precision of the machining of the parts or when the wear occurs due to the friction between the radial bearings and the screws. Thereby eliminating noise, vibration, heat generation, backlash, etc. due to conflicts between parts. It has an epoch-making effect of increasing the life of the screw conveyor.

Moreover, according to the present invention, the rotational motion of the screw shaft is converted into a linear motion of the nut without loss and precision. Therefore, a bearing screw conveying device with high energy efficiency and high precision of delivery can be obtained.

200‧‧‧ screw shaft

210‧‧‧ screw

300‧‧‧ nut body

310‧‧‧Mounting holes

320‧‧‧ brake groove

350‧‧ pin holes

360‧‧‧Support frame

400‧‧‧fixer

410‧‧‧ body

420‧‧‧ shaft hole

430‧‧‧ bearing pads

440‧‧‧ bumps

450‧‧‧ screw slot

500‧‧‧ radial bearings

600‧‧‧Rotary axis

700‧‧‧ Spring

800‧‧‧Compensation cap

900‧‧‧Compensation

1 is a structural sectional view of a conventional ball screw.

Figure 2 is a cross-sectional view of Figure 1 taken along line A-A.

Figure 3 is a compensation error type bearing screw transmission according to a first example of the present invention An exploded perspective view of the delivery device.

Figure 4 is a longitudinal sectional view of a compensation error type bearing screw conveying device according to a first example of the present invention.

Figure 5 is a cross-sectional view of a compensation error type bearing screw conveying device in accordance with a first example of the present invention.

Figure 6 is a perspective view of a holder of a first example of the present invention.

Figure 7 is a partial cross-sectional view illustrating the relationship of a compensating cap, a retainer, a radial bearing, and a screw.

Figure 8 is a longitudinal sectional view showing a conveying action of a compensation error type bearing screw conveying device according to a first example of the present invention.

Figure 9 is a partial cross-sectional view showing the relationship between the compensation cap, the holder, the radial bearing, and the screw when the cross-sectional shape of the screw of the first example of the present invention is triangular.

Figure 10 is an exploded perspective view of a compensation error type bearing screw conveying device according to a second example of the present invention.

Figure 11 is a longitudinal sectional view of a compensation error type bearing screw conveying device according to a second example of the present invention.

Figure 12 is a cross-sectional view of a compensation error type bearing screw conveying device in accordance with a second example of the present invention.

Figure 13 is a perspective view of a holder used in a second example of the present invention.

Figure 14 is a partial cross-sectional view illustrating the relationship of the compensation pin, the retainer, the radial bearing, and the screw.

Figure 15 is a partial cross-sectional view illustrating the relationship between the compensation pin diameter and the position of the holder.

Figure 16 is a longitudinal sectional view showing a conveying action of a compensation error type bearing screw conveying device according to a second example of the present invention.

Figure 17 is a longitudinal sectional view showing the independent installation of the compensation pin for each radial bearing of the compensation error type bearing screw conveying device according to the second example of the present invention.

18a and 18b are partial cross-sectional views showing the radial bearing and the screw connecting method in the case where the cross-sectional shape of the screw of the second example of the present invention is trapezoidal.

19 and 20 are longitudinal sectional views showing an additional lubricating oil storage tank mounted on a compensation error type bearing screw conveying device according to a second example of the present invention.

200‧‧‧ screw shaft

210‧‧‧ screw

300‧‧‧ nut body

310‧‧‧Mounting holes

350‧‧ pin holes

400‧‧‧fixer

450‧‧‧ screw slot

600‧‧‧Rotary axis

700‧‧‧ Spring

Claims (6)

A compensation error type bearing screw conveying device comprising: a screw shaft forming a screw on an outer circumferential surface; the screw shaft being inserted inside and forming a plurality of mounting holes on the outer circumferential surface along a path conforming to the screw spiral; a mounting hole of the nut body, and the outer wheel abuts the outer surface of the screw shaft of the screw shaft, and when the screw shaft or the nut body rotates, the radial bearing rotates at a regular position; and is disposed at an upper portion of the radial bearing to adjust the diameter to the center of the screw shaft a position adjuster to a bearing position; wherein the position adjuster includes a support frame formed at a lower end of the nut body mounting hole; a spring inserted in the mounting hole and disposed at an upper portion of the support frame; and being inserted into the mounting hole a fixing device for fixing a rotating shaft of the radial bearing at an upper portion of the spring; and a screw joint with the upper portion of the fixing device inserted into the mounting hole, and pressing the fixing device in a spring direction, and adjusting according to a screw tightening degree A compensation cap for the height of the screw shaft in the center direction of the above holder. A compensation error type bearing screw conveying device comprising: a screw shaft forming a screw on an outer circumferential surface; the screw shaft being inserted inside and forming a plurality of mounting holes on the outer circumferential surface along a path conforming to the screw spiral; a mounting hole of the nut body, and the outer wheel abuts the outer surface of the screw shaft of the screw shaft, and when the screw shaft or the nut body rotates, the radial bearing rotates at a regular position; a position adjuster disposed at an upper portion of the radial bearing to adjust a radial bearing position toward a center of the screw shaft; wherein the position adjuster includes a support frame formed at a lower end of the nut body mounting hole; and is inserted into the mounting hole a spring at an upper portion of the support frame; a screw groove inserted in the mounting hole and provided at an upper portion of the spring and inserting a rod-shaped pin, and a fixing device for fixing a rotating shaft of the radial bearing; a pin hole penetrating through the upper portion of the mounting hole; and a screw groove inserted into the pin hole and the retainer, and a compensation pin for adjusting the height of the screw shaft in the center of the screw according to the diameter of the screw groove portion. A compensating error type bearing screw conveying device according to claim 1 or 2, wherein the projection is integrally formed at a lower portion of the body of the holder, and the support frame at the lower end of the mounting hole is formed to be inserted into the protrusion. Brake the groove so that the holder does not rotate. A compensating error type bearing screw conveying device according to claim 1 or 2, wherein a bearing pad which is recessed into a part of the radial bearing is formed in a lower portion of the holder, and a part of the radial bearing is inserted into the bearing The pad, the remaining portion of which protrudes from the outside of the bearing pad and protrudes from the outer wheel abuts the screw. A compensating error type bearing screw conveying device according to the second aspect of the invention is characterized in that the compensating pin can simultaneously press a holder provided in a plurality of mounting holes in the longitudinal direction of the screw shaft. A compensation error type bearing screw conveying device according to item 2 of the patent application scope is characterized in that: the compensation pin is separately pressed for machining error Each radial bearing having a difference in difference or wear degree is inserted a plurality of times slightly longer than the screw groove width of the holder.