TW201719058A - Lubricating seal assembly for ball screws - Google Patents

Abstract

The present invention relates to a lubricant-containing member assembly for a ball screw. The lubricant-containing member assembly comprises: a feed nut (20) fed along a screw shaft (10) and provided so that a rolling element is rotated at a position corresponding to a screw groove (12) of the screw shaft (10); and a lubrication package (100) consisting of an arcuate cover (30), provided on the feed nut (10) and having a docking chamber (32) formed therein, a lubricant-containing member (40), accommodated in the docking chamber (32) and having a lubrication docking portion (42) which protrudes therefrom so as to lubricate the screw groove (12), and an elastic body (50) pressing the lubricant-containing member (40). The lubrication package (100) is radially arranged at a plurality of positions around the screw shaft (10) and is combined with each other by means of a fastening part (60) so that each lubricant-containing member (40) lubricates the screw groove (12) in independent spaces.

Description

Lubrication seal assembly for ball screw

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a lubricating seal assembly for a ball screw, and more particularly to an arched cover and an oil-containing member (a component containing a lubricating oil) which is constructed of an integral lubrication package and can be based on a thread groove including a ball screw. On-site conditions, such as the number of lubricants and the amount of lubricant supplied, the lubrication seal assembly for the ball screw is quickly and easily changed by means of a user combination.

The ball screw is composed of a threaded shaft, a transfer nut and a plurality of rotating bodies. The threaded shaft is formed with one or more rows of thread grooves, and is rotated by the driving portion, and the transfer nut is transferred along the threaded shaft, and the rotating body is mounted on the transfer nut. Internal circulation, rolling motion along the thread groove. At this time, in the thread groove, in order to prevent wear and damage caused by the rolling motion of the rotating body, the operator periodically applies the lubricating oil, but when the lubrication cannot be accurately observed When the oil coating amount is timely, the life of the ball screw is often directly shortened.

Therefore, according to the conventionally disclosed lubrication technology for a ball screw, there is an automatic lubrication technique of the Korean Patent Publication No. 10-1395128, which is assigned to the prior art, including a moving body and a lubrication unit mounted on the long shaft, and is equipped in the lubrication unit. The fuel tank, if the movement of the moving body is sensed by means of the sensor, the controller drives the motor to deliver the lubricant stored in the oil tank to the long-axis surface.

However, in the prior art, the components including the sensor, the motor, and the controller are installed in a narrow space inside the lubrication unit, and thus the structure is complicated, the number of small faults is high, and the price is high, and in particular, another power source is required. Therefore, there is a problem that maintenance management is troublesome and additional costs are continuously incurred.

Further, the ball screw products which are distributed on the market are composed of a single-row type or a multi-row type depending on the number of the screw grooves, and are classified into various types according to the pitch and the diameter of the threaded shaft. Therefore, according to the prior art, Each model requires a dedicated lubrication unit to be prepared separately. Therefore, the disadvantage is that the inventory management cost increases, and the structure cannot be changed by the user combination, so that the number of the thread grooves, the installation space, and the lubrication can be flexibly handled. On-site situation including oil supply.

On the other hand, in the case of installing an integral type lubricating package which is not divided when viewed from the end surface of the ball screw, when the sliding member is not attached to the thread groove precisely with the nut, the sliding member comes into contact with the threaded shaft. An eccentric result occurred. As a result, the sliding member in the eccentric direction cannot normally come into contact with the thread groove of the threaded shaft, and the lubricating action cannot be exerted, which causes not only poor lubrication but also excessive contact due to eccentricity, which causes an increase in the operating torque.

Technical problem solved

Accordingly, the present invention has been made to solve the above problems, and an object thereof is to provide a lubricating seal assembly for a ball screw, which supplies an oil-containing member that supplies lubricating oil to the arch cover and the threaded shaft to integrally lubricate the package. The structure is quickly and easily changed by the user combination based on the scene including the number of screw grooves of the ball screw and the amount of lubricating oil supplied.

Technical solutions

In order to achieve this object, the invention is characterized in that it comprises a transfer nut (20) which is transferred along a threaded shaft (10) and is arranged such that the rotor corresponds to a threaded groove (12) of the threaded shaft (10). a positional cycle; and a lubrication package (100) composed of an arched cover (30), an oil-containing member (40) and an elastic body (50), the arched cover (30) being mounted to the transfer nut (20) to form a butt joint a chamber (32), the oil-containing member (40) is housed in the docking chamber (32), and a lubricating abutting portion (42) is protruded to lubricate the thread groove (12), and the elastic body (50) is added to the oil-containing member (40) The pressure-lubricating package (100) is radiated and centered on the threaded shaft (10), and is combined with each other by means of a fastener (60), so that each oil-containing member (40) is in a separate space to the thread groove. (12) Perform lubrication.

Preferably, a correction space portion (33) is formed in the interior of the docking chamber (32) so that the oil-containing member (40) moves toward the longitudinal direction of the threaded shaft (10) and the square shaft orthogonal to the threaded shaft (10), and contains oil. The lubricating abutting portion (42) of the member (40) is formed to have a narrower width toward the end portion, and acts to correct the positional force that moves toward the center of the screw groove (12).

Preferably, the threaded shaft (10) is provided such that the threaded grooves (12) are independently lubricated by means of the respective lubricating packages (100) depending on the number of threaded grooves (12).

Preferably, the lubricating abutment (42) is formed in a line or dot shape.

Preferably, the oil-containing member (40) is formed with a main rail portion (44) on the outer peripheral surface, and an auxiliary rail portion (46) is formed at the upper portion, and the main rail portion is independently guided in the interior of the docking chamber (32). (44) and the main guide portion (34) and the auxiliary guide portion (36) of the auxiliary rail portion (46) are double-guided.

Effect of the invention

According to the above configuration and operation of the present invention, in the present invention, the arched cover and the oil-containing member integrally form the lubricating seal assembly, and have a site condition according to the number of thread grooves including the threaded shaft and the supply amount of the lubricating oil. The effect of the structure is quickly and easily changed by the user combination.

Further, the oil-receiving member is moved in the longitudinal direction of the threaded shaft and the longitudinal direction of the threaded shaft in the butt-spaced portion, and is guided by the butt portion whose width is narrower toward the end portion, and moves toward the center of the screw groove. The position correction force continues to act, so the error range due to assembly tolerances and wear is automatically corrected, preventing the increase of the running torque caused by excessive contact, preventing the lubrication failure caused by the non-lubrication gap, and continuing without the need for intermediate inspection. Use the effect of oily parts.

Further, according to the embodiment of the present invention, when the oil-containing member is mounted, the divided arched cover is assembled by assembly, the assembly time is shortened and the assembly work efficiency is improved, and the number of oil-containing components to be used can be adjusted according to the number of thread grooves of the ball screw. It has the effect of being able to achieve cost reduction.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

The present invention relates to a lubricating seal assembly for a ball screw. In the case of a lubricating seal assembly for a ball screw, the arched cover and the oil-containing member are integrally formed into a lubricating package, in order to achieve a number of thread grooves according to the ball screw. The installation situation, the installation space, and the amount of lubricating oil supply, and the structure are quickly and easily changed by the user combination. The main structure includes the threaded shaft 10, the transfer nut 20, and the lubricating package 100.

The transfer nut 20 of the present invention is transferred along the screw shaft 10, and is equipped to circulate a rotating body (not shown) at a position corresponding to the screw groove 12 of the screw shaft 10. The transfer nut 20 is disposed such that a plurality of rotating bodies are spirally circulated inside. At this time, a part of the rotating body is exposed inside the transfer nut 20 and meshes with the screw groove 12 of the threaded shaft 10. Therefore, at the time of the forward and reverse rotation of the threaded shaft 10, the rotor 20 meshes with the thread groove 12, and the nut 20 is moved linearly forward and backward.

In addition, the lubricating package 100 of the present invention is composed of an arched cover 30, an oil-containing member 40 and an elastic body 50. The arched cover 30 is mounted on the transfer nut 20, and is formed with a docking chamber 32. The oil-containing member 40 is housed in the docking chamber 32, and is convex. A lubricating abutting portion 42 is provided to lubricate the thread groove 12, and the elastic body 50 pressurizes the oil containing member 40. The dome cover 30 is formed in a sector shape having a central angle of 180 or less, and the arcuate lubrication port 31 is disposed in communication with the inside of the docking chamber 32 on the side corresponding to the threaded shaft 10. At this time, a part of the lubrication port 31 is cut away so that only the lubricating abutting portion 42 of the oil-containing member 40 is exposed to the outside, so that both ends of the oil-containing member 40 attached to the inside of the docking chamber 32 are caught on both sides of the lubrication port 31 to prevent separation. external.

On the other hand, the docking chamber 32, as shown in Fig. 9, opens a side of the arched cover 30, ensuring a passage communicating with the docking chamber 32 for easy insertion and replacement of the oil-containing member 40, and the passage may be by means of another cut-off plate. The composition of opening and closing.

In FIG. 1, the state in which the dome cover 30 has a central angle (hemispherical shape) of 180° and is divided into a pair, and the lubricating package 100 in a ring shape is formed by being combined with each other, but is not limited thereto. As shown in FIGS. 3a to 3c, the dome cover 30 may be divided by a central angle of 60, a central angle of 90, and a central angle of 120, and may be provided in a plurality of configurations.

In this manner, since the dome cover 30 is divided and joined in an equal angle, it can be mounted without disassembling the ball screw assembly, and has an advantage of being easily replaced.

Among them, the oil-containing member 40 accommodated in the docking chamber 32 of the dome 30 is formed of a mixture containing a plastic resin and a lubricating oil, and the plastic resin composition which is continuously eluted as a lubricating oil has a light physical property, and thus the thread groove 12 is considered in advance. The shape is subjected to tolerance machining so that the lubricating abutment portion 42 is provided at a position corresponding to the thread groove 12.

In Fig. 4, the oil-containing member 40 is equipped to be pressurized by the elastic body toward the thread groove 12, and the elastic body 50 has one end supported on the oil-containing member 40 and the other end supported on the inner side wall of the docking chamber 32, and is oiled by means of the expansion elastic force. The structure in which the member 40 is pressurized toward the lubrication port 31 side.

At this time, the lubricating package 100 is arranged in a radial shape around the threaded shaft 10 and disposed at a plurality of places, and is combined with each other by means of the fastener 60, and each of the oil-containing members 40 lubricates the screw groove 12 in a separate space. The fastener 60 is constructed of a removable means including a pin and a hole, a hook and a hook groove, and a bolt connection. As shown in FIGS. 5a and 5b, a boss portion of the fastener 60 is formed at one end of the arch cover 30. The recessed portions of the fasteners 60 are formed at the other end and assembled to each other, so that the dome cover 30 can be formed in a single gauge, which improves productivity, assemblability, and ease of inventory management. On the other hand, the configuration of the fastener 60 may be applied by bolting.

Further, the arched cover 30, which is assembled to each other in a ring shape by means of the fastener 60, is provided with another fastener 60' at one end corresponding to the transfer nut 20, as shown in Figs. 6a to 6c, the fastener 60' is comprised of a pin It is composed of a removable means such as a hole, a hook and a hook groove, and a bolt connection. Further, as shown in FIG. 7, a fastener 60' may be formed on the upper surface and the lower surface of the dome cover 30, and the lubricating package 100 may be laminated and assembled along the longitudinal direction of the screw shaft 10.

In this manner, the dome cover 30 and the oil-containing member 40 integrally form the lubricating package 100, and there is an advantage that the structure (mounting position and number) can be quickly and easily changed on site by means of a user combination.

In addition, the threaded shaft 10 is provided such that the thread groove 12 is independently lubricated by means of the respective lubricating packages 100, depending on the number of thread grooves 12. As an example, as shown in FIG. 2a, when applied to a threaded shaft 10 having two rows of thread grooves, each thread groove is lubricated by the respective oil-containing member 40 in a separate space by a combination of lubricating packages formed by equal angular division. Therefore, it is possible to prevent peripheral contamination caused by leakage of lubricating oil while preventing poor lubrication. Further, when the amount of the lubricating oil supply is increased in accordance with the site conditions, there is an advantage that the structure can be elastically changed so that the lubricating package 100 having a large replacement capacity or the additional combination of the lubricating package 100 can be laminated.

On the other hand, as shown in FIG. 2b, the configuration of the lubricating abutting portion 42 may be omitted so that when the lubricating package 100 is applied to the threaded shaft 10 having a row of the thread grooves 12, the one side oil-containing member 40 is lubricated and docked. The portion 42 lubricates the thread groove 12, and the other oil-containing member 40 lubricates the surface of the threaded shaft 10.

At this time, the correction space portion 33 is formed inside the butting chamber 32 so that the oil-containing member 40 moves in the longitudinal direction of the screw shaft 10 and the four sides orthogonal to the screw shaft 10, and the lubricating abutting portion 42 of the oil-containing member 40 is turned toward the end portion. The narrower the width is formed, the positional correction force that moves toward the center of the screw groove 12 acts. The correction space portion 33 serves as a space formed between the inner wall surface of the butt chamber 32 and the outer circumferential surface of the oil-containing member 40, and allows the oil-containing member 40 to move in four positions inside the docking chamber 32.

Therefore, when the dome 30 is installed, the lubricating abutting portion 42 of the oil-containing member 40 moves in position while entering along the thread groove 12, so that the meshing position is correct, and thus the error range due to assembly tolerance and wear is automatically corrected. It prevents the increase of the running torque caused by excessive contact, prevents the lubrication failure caused by the non-lubrication gap, and can continuously use the oil-containing parts without the intermediate inspection. In addition, the oil-containing member 40 provides the elastic application while correcting the position at the inclination angle. The versatility of the diverse product groups of the thread grooves 12 having different pitches, in particular, the fact that the non-lubricated notches are automatically compensated by the positional movement of the oil-containing member 40 even when the lubricating butt portion 42 is worn during use.

In addition, the lubricating abutting portion 42 is formed in a line shape or a dot shape. Fig. 8a illustrates a state in which the lubricating abutting portion 42 is formed in the same partial spiral shape as the screw groove 12, and Fig. 8b shows a state in which the lubricating abutting portion 42 is formed in a hemispherical convex shape. In the case of Fig. 8b, at least two places are contacted and lubricated, thus providing versatility that can be flexibly applied to the thread grooves 12 having various pitches.

Further, the oil-containing member 40 has a main rail portion 44 formed on the outer peripheral surface thereof, and an auxiliary rail portion 46 formed at the upper portion, and the main guide portion 34 that guides the main rail portion 44 and the auxiliary rail portion 46 independently in the mating chamber 32. The auxiliary guide unit 36 performs dual guidance. As shown in FIG. 9, the main guide portion 34 is formed in parallel with the inner wall surface of the docking chamber 32 adjacent to the lubrication port 31, and the auxiliary guide portion 36 is formed in parallel on the upper side of the docking chamber 32 adjacent to the elastic body 50. The interval between the auxiliary guiding portions 36 is formed to be smaller than the interval between the main guiding portions 34. Further, the oil-containing member 40 is disposed at a position corresponding to the main guide portion 34 and the auxiliary guide portion 36, and the main rail portion 44 and the auxiliary rail portion 46 are formed to perform a sliding motion.

Therefore, the main rail portion 44 and the auxiliary rail portion 46 of the oil-containing member 40 are in surface contact with the main guide portion 34 and the auxiliary guide portion 36 of the docking chamber, and are configured to guide the up-and-down transfer while slidingly transporting, and the upper portion of the oil-containing member 40 and The lower portions are independently supported, which prevents unnecessary swimming, that is, a phenomenon in which the side corresponding to the screw groove abuts the lubricating portion.

On the other hand, in order to secure the space portion required for the elastic body 50 to be attached to the inside of the narrow butting chamber 32, the auxiliary rail portion 46 of the oil-containing member 40 may be at the upper end of the oil-containing member 40 as shown in FIG. The portion 46 is convex in a quadrangular shape, and the mounting space portion 46a of the elastic body 50 is formed inside. At this time, the elastic body 50 is accommodated and supported by the installation space portion 46a, and not only prevents deformation, but also moves the position together with the oil-containing member 40 when the automatic position is corrected, and the pressing force always acts in a direction orthogonal to the threaded shaft 10, thereby preventing oily Partial wear of the component 40.

In addition, FIG. 9 shows a state in which the elastic bodies 50 are disposed at two places. At this time, the elastic supporting force of the elastic body 50 acts at two spaced locations, and the pressurization acts on both ends of the oil-containing member 40. Therefore, the swimming and shaking phenomenon of the oil-containing member 40 during operation is prevented, and the uniform positional correction force is applied to the advantage of lubricating the entire section of the butting portion 42.

10‧‧‧Threaded shaft
12‧‧‧Thread groove
20‧‧‧Transfer nut
30‧‧‧Arch cover
31‧‧‧Lubrication port
32‧‧‧Docking room
33‧‧‧Revision of Space Department
34‧‧‧Main Guide
36‧‧‧Auxiliary Guidance Department
40‧‧‧ Oily parts
42‧‧‧Lubrication docking
44‧‧‧Main track section
46‧‧‧Auxiliary track department
46a‧‧‧Installation Space Department
50‧‧‧ Elastomers
60, 60'‧‧‧fasteners
100‧‧‧Lubricated package

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing the construction of a lubricating seal assembly for a ball screw according to an embodiment of the present invention. 2a and 2b are cross-sectional views illustrating the internal structure of a lubricating seal assembly for a ball screw of the present invention. 3a, 3b, and 3c are schematic views showing the configuration of an embodiment of an arched cover provided in the lubricating seal assembly for a ball screw of the present invention. 4 is a schematic view showing the configuration of a lubricating package provided in the lubricating seal assembly for a ball screw of the present invention. 5a and 5b are schematic views showing the structure of a fastening structure of an arched cover provided in the lubricating seal assembly for a ball screw of the present invention. 6a, 6b, and 6c are schematic views showing the constitution of the detachable structure of the lubricating package provided in the lubricating seal assembly for a ball screw of the present invention. Fig. 7 is a schematic view showing the configuration of a laminated structure of a lubricating package provided in the lubricating seal assembly for a ball screw of the present invention. 8a and 8b are schematic views showing the configuration of an embodiment of a lubricating butt joint provided in the lubricating seal assembly for a ball screw of the present invention. Fig. 9 is an exploded view showing the internal structure of a lubricating package provided in the lubricating seal assembly for a ball screw of the present invention.

10‧‧‧Threaded shaft

12‧‧‧Thread groove

20‧‧‧Transfer nut

30‧‧‧Arch cover

31‧‧‧Lubrication port

40‧‧‧ Oily parts

42‧‧‧Lubrication docking

100‧‧‧Lubricated package

Claims (5)

A lubrication seal assembly for a ball screw, comprising: a transfer nut (20) that is moved along a threaded shaft (10) configured to correspond to a threaded groove (12) of the threaded shaft (10) a positional cycle; and a lubrication package (100) consisting of an arched cover (30), an oil-containing component (40) and an elastomer (50) mounted to the transfer nut (20) to form There is a docking chamber (32), the oil-containing member (40) is accommodated in the docking chamber (32), and a lubricating abutting portion (42) is protruded to lubricate the thread groove (12), the elastic body (50) facing the oil-containing member (40) Pressurization; the lubricating package (100) is radiated and centered around the threaded shaft (10), and is combined with each other by means of a fastener (60) so that the respective oil-containing members (40) are The separate space lubricates the thread groove (12). A lubrication seal assembly for a ball screw according to claim 1, wherein a correction space portion (33) is formed inside the docking chamber (32) so that the oil-containing member (40) is oriented toward the threaded shaft ( 10) the longitudinal direction and the square movement orthogonal to the threaded shaft (10), the lubricating abutting portion (42) of the oil-containing member (40) is formed to be narrower toward the end portion, so as to be toward the center of the thread groove (12) The positional correction force of the movement acts. The lubricating seal assembly for a ball screw according to claim 1, wherein the threaded shaft (10) is provided with the thread groove (12) by means of each lubricating package according to the number of the thread grooves (12) (100) is independently lubricated. The lubricating seal assembly for a ball screw according to claim 1, wherein the lubricating abutting portion (42) is formed in a line shape or a dot shape. The lubricating seal assembly for a ball screw according to claim 1, wherein the oil-containing member (40) has a main rail portion (44) formed on an outer peripheral surface thereof, and an auxiliary rail portion (46) formed at an upper portion thereof. In the interior of the docking chamber (32), double guidance is performed by guiding the main guide portion (34) and the auxiliary guide portion (36) of the main rail portion (44) and the auxiliary rail portion (46) independently, respectively.