KR200190805Y1 - High load supporting ball bearing unit for linear motion - Google Patents

Abstract

The present invention relates to a ball bearing unit for a high load linear motion, and is formed between the block member and the rail member respectively to form a bearing surface to induce rolling contact with the ball to effectively withstand the vertical load, thereby improving the durability of the bearing The purpose is to make it possible.

The present invention for achieving the object described above, the circular arc-shaped lower surface 11, the gothic arc-shaped lower surface 12 and the unloaded passages 13, 14 of the circular opening shape. Block members 10 each having a pair of left and right symmetrical pairs, and a circular arc lower surface 21 corresponding to the circular arc lower surface 11 and the gothic arc lower surface 12 of the block member 10, respectively. And the gothic arc underside 22, each having a pair of left and right symmetrical pairs of rail members 20, and when the block member 10 and the rail member 20 are coupled, these load surfaces 11, 12, 21, 22 A plurality of balls 30 interposed between the plurality of balls 30, coupled to both sides of the block member 10, and closing both ends of the block member 10 to form a circulation path of the ball 30. A side cover member 40 having circulation paths 41a and 41b, and a center retainer 50 and a side retainer 60 and a wa to support the ball 30 on the block member 10; Made consists of young container 70, and the block member 10 and rail member 20, the under-seal 80 and the end cover member 90 to remove sweeping while preventing the foreign matter entering between.

Description

HIGH LOAD SUPPORT BALL BEARING UNIT FOR LINEAR MOTION

The present invention relates to a ball bearing unit mounted on a part requiring linear motion of general machinery and to guide it, and in particular, a load surface between a block member and a rail member is configured to withstand a large load of vertical load. The present invention relates to a ball bearing unit for a high load linear motion that can be mounted on a machine element that is linearly moving while receiving the same, and also maximizes the durability life of the ball bearing unit in use.

In general, ball bearing units for linear motion are mounted on parts where sliding motion is required to guide linearly from the reference position to the position for the purpose of objects, such as in industrial machine tools, robots, automatic tool changers, and various general machines. As described above, the ball bearing unit for linear motion developed for this purpose is commonly referred to as a Linear Motion Guide.

On the other hand, the cross section of the general form of the above-mentioned conventional linear motion ball bearing unit is shown in Figure 1, the rail member 100, which is usually formed in a straight line shape, and on the rail member 100 It is composed of a block member 110 is mounted to slide on the basis of this to perform a linear movement, and the ball 120 to smoothly occur between the rail member 100 and the block member 110, The rail member 100 has a concave lower surface (101, 111) is formed between the rail member 100 and the block member 110 so as to seat the block member 110 on the upper support In addition, the lower surface (101, 111) has a plurality of balls (so that the block member 110 is fitted on the rail member 100, the linear motion is smoothly made while reducing friction with the rail member 100 when sliding) Built-in 120) The plurality of balls 120 may include a load passage 130 on which the lower surface 101 of the rail member 100 and the lower surface 111 of the block member 110 are formed, and the block member 110. The non-load passage 140, which is in the form of a through hole provided thereon, is configured to move on an endless track.

However, the ball bearing unit of the conventional general type as described above is formed such that the lower surfaces 101 and 111 of the rail member 100 and the block member 110 maintain the contact angle with the ball 120 at 45 degrees, respectively. When the load is applied from the upper portion of the block member 110, the stress generated inside the ball bearing unit increases as the contact angle is 45 degrees, this contact acts as an excessive load on the ball bearing unit.

In addition, if the stress generated inside the ball bearing unit is increased as described above, it causes a shortening of the life of the bearing, which is a disadvantage that has a fatal adverse effect on durability.

The present invention has been devised to solve the above disadvantages, the load is formed between the block member and the rail member to induce rolling contact with the ball effectively to withstand the vertical load, thereby improving the durability of the bearing It is an object of the present invention to provide a ball bearing unit for a high load linear motion that can be improved.

1 is a schematic cross-sectional view of a conventional ball bearing unit for linear motion.

2a, 2b, 2c is a cross-sectional view, a side view and a bottom view showing a block member of a ball bearing unit for linear motion according to the present invention, respectively.

3a and 3b are front and side views respectively showing a rail member of a ball bearing unit for linear motion according to the present invention.

Figure 4 is an assembled cross-sectional view showing the assembled state of the block member and the rail member.

5a and 5b are front and rear views respectively showing the side cover member of the ball bearing unit for linear motion according to the present invention.

6a and 6b are respectively a perspective view showing the first and second ball guides of the ball bearing unit for linear motion according to the present invention.

7 is a perspective view showing the center retainer of the ball bearing unit for linear motion according to the present invention.

8 is a perspective view showing a side retainer of a ball bearing unit for linear motion according to the present invention.

9 is a perspective view showing a wire retainer of a ball bearing unit for linear motion according to the present invention.

Figure 10 is a perspective view showing the underseal of the ball-veil unit for linear motion according to the present invention.

11 is a front view showing the end cover member of the ball bearing unit for linear motion according to the present invention.

* Explanation of symbols for main parts of the drawings

10: block member 20: rail member

11, 21: circular load 12, 22: gothic arc load

30: ball 31, 32: load path

40: side cover member 41a, 41b: ball circulation path

44, 45: 1st, 2nd ball guide 50: Center retainer

60: side retainer 70: wire retainer

80: underseal 90: end cover member

The present invention for achieving the above object is, the block member having a circular arc-shaped load surface and the gothic arc-shaped load surface and a circularly open no-load passage symmetrically paired left and right, respectively; A rail member having a pair of circular arc loads and a gothic arc load, respectively, symmetrically corresponding to the circular arc load surface and the gothic arc load surface of the block member, the combination of the block member and the rail member A plurality of balls inserted between these load surfaces to perform rolling motion, side cover members having ball circulation paths coupled to both sides of the block member and closing both ends of the block member to form a circulation path of the ball, and To support the ball on the block member, wipe it out while preventing the inflow of foreign matter between the center retainer, the side retainer and the wire retainer, and the block member and the rail member. With an under seal and the end of the lid member it is made to the configuration.

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

2a, 2b, 2c is a cross-sectional view, a side view, and a bottom view showing a block member of the ball bearing unit for linear motion according to the present invention, respectively, Figures 3a, 3b are respectively used for linear motion according to the present invention A front view and a side view showing the rail member of the ball bearing unit, and FIG. 4 is an assembled cross sectional view showing the assembled state of the block member and the rail member.

As shown in the drawing, the high load linear motion ball bearing unit of the present invention has a block member 10 having a circular arc-shaped load surface 11 and a gothic arc-shaped load surface 12 and a circular opening. And a pair of unloaded passages 13 and 14, respectively, symmetrically from side to side, and the rail member 20 is disposed on the circular arc lower surface 11 and the gothic arc lower surface 12 of the block member 10. Each of the corresponding circular arc lower surface 21 and the gothic arc lower surface 22 is provided with a pair of symmetrical left and right, respectively, a plurality of balls 30 are coupled to the block member 10 and the rail member 20 During the load (11, 12, 21, 22) is inserted between the rolling motion, while the side cover member 40 is coupled to both sides of the block member 10, both sides of the block member 10 The ball is moved along the circular arc load 11 and the gothic arc load 12 and the no-load passages 13 and 14 while closing the end portion ( Ball circulation paths 41a and 41b connecting between the lower surfaces 11 and 12 and the no-load passages 13 and 14 to form a circulation passage of 30 are provided, and the center retainer 50 and the side retainer 60 are provided. And the wire retainer 70 is fixed to both side ends of the side cover member 40 so as to support the ball 30 on the block member 10, the underseal 80 is on the block member 10 Both ends are fixed to the side cover member 40, respectively, to prevent the inflow of foreign matter into the coupling portion between the block member 10 and the rail member 20, the end cover member 90 is the side cover member ( 30 is coupled to the block member 10 when the linear movement on the rail member 20 is to wipe off the foreign matter caught in the rail member 20.

Here, the circular arc lower surface 11 and the gothic arc lower surface 12 provided in the block member 10 are formed to extend horizontally over the entire length along the longitudinal direction of the block member 10, and the same The circular arc lower surface 21 and the gothic arc lower surface 22 of the rail member 20 also extend horizontally over the full length along the longitudinal direction of the rail member 20.

Accordingly, the circular arc lower surface 11 and the gothic arc lower surface 12 of the block member 10 together with the circular arc lower surface 21 and the gothic arc lower surface 22 of the rail member 20. Respectively, the balls 30 form load paths 31 and 32 through which rolling motions can be made.

In addition, when the block member 10 and the rail member 20 are coupled to each other, as shown in FIG. 4, the circular arc lower surfaces 11 and 21 of the block member 10 and the rail member 20 are illustrated. The load path 31 formed by these two-point contact with the ball 30 and the contact angle is vertical, so that it can withstand the large load that is received vertically, that is to contribute to the improvement of the vertical load capacity On the other hand, the load passage 32 formed by the gothic arc lower surfaces 12 and 22 of the block member 10 and the rail member 20 makes four-point contact with the ball 30, but the contact angle is about 45 °. Therefore, even if the load capacity received vertically falls slightly, it is possible to more firmly support various loads acting in various directions.

The block member 10 includes a plurality of balls 30 having a circular arc lower surface 11, a gothic arc lower surface 12, and a circular arc lower surface of the rail member 20 of the block member 10. No-load passages 13, 14 having a circular cross section to serve as a path in the form of an endless track when rolling motion in the load passages 31 and 32 formed between the 21 and the gothic arc underside 22. ) Is provided in two rows up and down on the left and right sides, and the no-load passages 13 and 14 are formed by side cover members 40 coupled to both sides of the block member 10 together with the lower surfaces 11 and 12. Closes.

On the other hand, the side cover member 40, as shown in Figure 5a, by connecting the front end between the load passage 31, 32 and the no-load passage 13, 14, the continuous circulation of the ball 30 Ball circulation paths (41a, 41b) are respectively provided on the left and right sides up and down to serve as a passage, and the side cover member 40 is supplied to the ball circulation path (41a, 41b) to supply lubricant to the ball 30 Openings 42 are provided for inflow of lubricating oil from the outside so as to perform lubrication during circulation, and both sides of the openings 42 for inflowing lubricating oil communicate with the ball circulation paths 41a and 41b to serve as lubricating oil supply passages. The flow path 43 is provided so that the ball circulation path 41a located at the upper side of the first ball is shown in FIG. 6A having a circular arc shape and the both ends thereof are similar to the curvature of the ball 30. Guide 44 is seated, the ball circulation path 41b located on the lower side in Figure 6b A semi-cylindrical semi-cylindrical second ball guide 45 is shown in the cross section, and the first and second ball guides 44 and 45 respectively have through-holes facing the ball circulation paths 41a and 41b. 44a, 45a are formed.

In addition, the first ball guide 44 is formed with a cutting groove 44b which communicates with the flow path 43 to serve as a supply path for lubricating oil, and the second ball guide 45 has a semi-cylindrical cross section. Since it is a phase, only its shape can serve as a supply passage of lubricating oil, and no separate cutting groove is formed.

Accordingly, the first and second movements are performed along the load passages 31 and 32 formed by the load members 11, 12, 21, 22 of the block member 10 and the rail member 20 of the ball 30. Passing the back of the two ball guides (44, 45) to enter the no-load passages (13, 14) provided on the block member 10 again to the continuous circulation of the ball 30 is made.

In addition, as shown in Figure 5a to the side cover member 40, respectively supporting one side portion of the ball 30 which is clouded along the upper circular arc lower surface 11 and the no-load passage 13 Grooves 46a and 46b for mounting the center retainer 50 and the side retainer 60, respectively, are provided, and along the gothic arc load surface 12 and the no-load passage 14 of the block member 10 are provided. A groove 47 for mounting the wire retainer 70 supporting one side of the ball 30 to be moved is provided, and a groove 48 for mounting the underseal 80 is provided.

In this case, as shown in FIG. 5B, the rear end of the side cover member 40 having the grooves 46a and 46b for mounting the side retainers 60 may be fastened to accommodate the front end of the wire retainer 70. The groove 49a and the fastening hole 49b are provided continuously.

And the center retainer 50, as shown in Figure 7, the both ends are provided with projections 51 are fitted into the groove 46a of the side cover member 40, the length is provided at the left and right ends of the member A concave surface 52 is formed which extends along the direction and is concave to support the side of the ball 30.

In addition, as shown in FIG. 8, the side retainer 60 is provided with protrusions 61 fitted to the groove 46b of the side cover member 40 at both ends, and at one end of the member. A concave surface 62 is formed which extends along the longitudinal direction and is concave so as to support the side of the ball 30.

In addition, as shown in FIG. 9, the wire retainer 70 is a member having a circular cross section, and extends along the length direction of the block member 10, and both ends thereof are formed on the rear surface of the side cover member 40. As shown in FIG. It is formed to be bent to be fixed to the fastening hole (49b) along the fastening groove (49a).

On the other hand, the underseal 80, as shown in Figure 10, both ends are provided with a projection 81 is fitted into the groove 48 of the side cover member 40, the cross section on one side of the member The body portion 82 of a flexible material having ribs 82a protruding up and down on one side thereof, and a plurality of iron core members fixedly spaced apart at predetermined intervals along the longitudinal direction inside the body portion 82 ( 83).

In addition, the end cover member 90 is coupled to the side cover member 40, as shown in Figure 11, the inner portion is formed of a steel material while being inclined somewhat inward while being fixed so as to surround the rubber material outside the 91 When the block member 10 is seated on the rail member 20 and moves in a linear direction while rolling, the foreign matter caught on the rail member 20 is swept away. The ball circulation path is connected to the load passages 31 and 32 and the no-load passages 13 and 14 as a circulation passage of the ball 30 by communicating with the opening 42 for inflow of the lubricating oil of the side cover member 40 at the central portion ( Grease nipple mounting openings 92 for supplying lubricant to 41a and 41b are provided.

Hereinafter will be described in detail the operation and effects of the high load linear motion ball bearing unit according to the present invention.

The high load linear motion ball bearing unit of the present invention has a no-load passage 13 and 14 provided to continuously circulate the ball 30 between the block member 10 and the rail member 20 constituting the same. The circular arc load surface 11 of the block member 10 and the circular arc load surface 21 of the rail member 20, and the gothic arc load surface 12 and the rail member 20 of the block member 10. It is formed by the gothic arc surface of the bar 22, the load passage 31 located in the upper side of the load passage is in contact with the ball 30, the large load that the block member 10 receives vertically It is able to withstand enough, so that the vertical load capacity is improved, while the load path 32 located at the lower side of the load path makes four-point contact with the ball 30, so that even if the load capacity received vertically is somewhat lowered in various directions, Block member 10 is to be able to support more various loads that act When motion cloud on one member 20 will serve to somewhat compensate the role of the load passage 31.

In addition, the first ball guide 44 and the second ball guide 45 are mounted on the ball circulation paths 41a and 41b formed in the side cover member 40 which closes both ends of the block member 10. When the ball 30 is circulated between the load passage 31 and the no-load passage 13 and the load passage 32 and the no-load passage 14, respectively, it is to assist the circulation movement thereof.

Here, the through holes (44a, 45a) formed in the first ball guide 44 and the second ball guide 45, the lubricating oil introduced from the outside through the opening 42 and the flow path 43, the upper and lower load passage In (31, 32) is to be introduced between the ball 30 to the rolling motion to help lubrication between them. In addition, the cutting groove 44b formed in the second ball guide 45 serves as a passage to allow the lubricating oil flowing through the flow path 43 to be delivered to the second ball guide 45 mounted on the lower ball circulation path 41b. Do it.

In addition, both end portions of the center retainer 50 and the side retainer 60 are fixed to the grooves 46a and 46b of the side cover member 40, respectively, of the block member 10 and the rail member 20. The circular arc lower surface (11, 21) to prevent the departure of the ball 30 to the rolling motion to the load passage 31 formed.

That is, the concave surface 52 of the center retainer 50 and the concave surface 62 of the side retainer 60 each support some surface of both sides of the ball 30, so that the ball 30 is a block member ( 10) to prevent deviation from.

In addition, the wire retainer 70 is fixed to the groove 47 of the side cover member 40 and the fastening groove 49a and the fastening hole 49b on the rear surface thereof so that the block member 10 and the rail member ( The gothic arc under the load (12, 22) of the load passage 32 is formed to prevent the departure of the ball 30 in the cloud movement.

That is, the wire retainer 70 elastically supports the side of the ball 30 on the load passage 32 to prevent the ball 30 from being separated from the block member 10.

In addition, both end portions of the under seal 80 are fixed to the grooves 48 of the side cover member 40 to prevent foreign matter from penetrating into the coupling portion between the block member 10 and the rail member 20. It has a confidentiality function.

That is, since the ribs 82a formed in the upper and lower portions of the body portion 82 of the underseal 80 protrude along the longitudinal direction on one side of the body portion 82 to contact the side surfaces of the rail member 20. The airtightness between the block member 10 and the rail member 20 can be maintained continuously.

In addition, the end cover member 90 is provided on the side cover member 40 and has an opening 92 for mounting a grease nipple for supplying lubricant to the opening 42 of the side cover member 40. 30 is provided to help lubrication, and the inner side 91 has a protruding inner portion 91 which is in contact with the circular arc lower surface 21 and the gothic arc lower surface 22 of the rail member 20. When the block member 10 slides on the rail member 20, foreign substances caught on the load surface are swept away.

As described above, according to the high load linear motion ball bearing unit according to the present invention, a ball bearing unit mounted when a linear guide of an object to a desired position in an industrial machine tool, a robot, an automatic tool changer, etc. The load surface thereof is formed so that the vertical load capacity can be improved, so that the durability of the load can be improved even at a high load, thereby extending the life of the ball bearing unit to the maximum.

Claims (11)

A block member 10 having a pair of circular arc-shaped lower surfaces 11, a gothic arc-shaped lower surface 12, and a circularly open, unloaded passage 13 and 14 symmetrically from side to side, respectively. The circular arc load surface 21 and the gothic arc load surface 22 corresponding to the circular arc load surface 11 and the gothic arc load surface 12 of the block member 10 are respectively symmetrical from side to side. When the rail member 20 is provided with a pair, and the block member 10 and the rail member 20 are coupled, a plurality of balls are inserted between these load surfaces 11, 12, 21, and 22 to perform rolling motion ( 30, the side cover member 40 is coupled to both sides of the block member 10 and has ball circulation paths 41a and 41b forming a circulation passage of the ball 30 while closing both ends of the block member 10. And the center retainer 50, the side retainer 60, the wire retainer 70, and the block member 10 and the rail unit to support the ball 30 on the block member 10. Ball bearing unit for a high load linear motion consisting of an underseal 80 and the end cover member 90 to be wiped out while preventing foreign material inflow between the ash (20). The load passage 31 formed by the circular arc load surfaces 11 and 21 of the block member 10 and the rail member 20 is in two-point contact with the ball 30. Since the contact angles of the contact portions of the 30 and the lower surfaces 11 and 21 are vertical, the vertical load capacity is large, and the gothic arc lower surfaces 12 and 22 of the block member 10 and the rail member 20 are Forming load passage 32 is a ball bearing unit for a high load linear motion, characterized in that the four-point contact with the ball 30 to be able to more firmly support a variety of loads acting in various directions. According to claim 1, wherein the side cover member 40 is formed with ball circulation paths (41a, 41b) in the left and right upper and lower portions, respectively, interconnecting the front end portion between the load passages (31, 32) and no-load passages (13, 14) High load linear motion ball bearing unit, characterized in that to achieve a continuous circulation passage of the ball (30). 4. The lower cover member (40) according to claim 3, characterized in that the side cover member (40) is provided with an opening (42) for the inflow of lubricating oil and a flow passage (43) communicating therefrom with the ball circulation passages (41a, 41b). Ball bearing units for linear motion. The ball circulation path 41a of claim 3, wherein the ball circulation path 41a of the side cover member 40 has a circular arc shape and a first ball guide 44 in which both ends thereof are dug similar to the curvature of the ball 30, and the ball circulation path 41b. The second ball guide 45 having a semi-cylindrical shape having a semi-circular cross section is seated therein, and each of the first and second ball guides 44 and 45 has a through hole 44a facing the ball circulation paths 41a and 41b, respectively. , 45a is formed, the first ball guide 44, the ball bearing unit for a high load linear motion, characterized in that the cutting groove 44b is formed in communication with the flow path (43). According to claim 5, The side cover member 40 is a center retainer (50) for supporting one side of the ball (30) which is rolled along the circular arc load (11, 12) and the no-load passage 13, respectively ) And one side of the ball (30) to be moved along the gothic arc load surface (12, 22) and the no-load passage 14 to mount the side retainer (60) and side retainer (60), respectively A groove 47 for mounting the wire retainer 70, a groove 48 for mounting the underseal 80, and a fastening groove 49a for accommodating the front end portion of the side retainer 60 on the rear surface thereof. ) And a fastening hole (49b) is a ball bearing unit for a high load linear motion. According to claim 1, wherein the center retainer 50 is projected to fit into the groove (46a) of the side cover member 40 at both ends, and extending in the longitudinal direction to the left and right front end of the ball 30 A ball bearing unit for a high load linear motion, characterized in that it has a concave surface 52 formed concave to support the side. According to claim 1, The side retainer 60 is protruding portion 61 is fitted to the groove 46b of the side cover member 40 at both ends, and extends along the longitudinal direction to one end of the ball (30) Ball bearing unit for high load linear motion, characterized in that it has a concave surface formed concave to support the side of the). The method of claim 1, wherein The wire retainer 70 is a member having a circular cross section and extending along the longitudinal direction of the block member 10 so that both ends thereof are bent to be fixed to the fastening hole 49b formed on the rear surface of the side cover member 40. Ball bearing units for high load linear motion. According to claim 1, wherein the underseal 80 is a protrusion 81 is fitted to the groove 48 of the side cover member 40 at both ends and a rib 82a protruding up and down on one side of the member. For a high load linear motion, characterized in that made of a flexible material body portion 82 and a plurality of iron core members 83 fixedly spaced apart at predetermined intervals along the longitudinal direction inside the body portion 82 Ball bearing unit. According to claim 1, wherein the end cover member 90 is made of steel and the inside portion 91 is formed to be inclined somewhat inward while being fixed so as to surround the rubber material for the inflow of the lubricating oil of the side cover member 40 A ball bearing unit for a high load linear motion, comprising a grease nipple mounting opening (92) communicating with the opening (42).