JP3114864U - Ball screw circulation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball screw circulating device capable of accurately fitting and fixing a circulating member to a nut body.
SOLUTION: Installation recesses 14 are provided at both ends of a rolling groove 13 provided in a nut body 10, and circulating members 40, 41 at both ends are respectively fitted and arranged in the installation recesses 14, 14 at both ends. To do. In addition, the installation concave portion 14 includes a fitting portion 17 and a curved concave portion 18 projecting radially outward, and the circulation members 40 and 41 at both ends are fitted into the protruding portion 42 and the curved concave portion 18 to be fitted into the fitting portion 17. And a ball passage guiding portion 43 to be operated. Further, the protruding portion 45 for positioning in the radial direction protruding in a semicircular shape toward one side in the circumferential direction is provided on the protruding portion 42 of the circulation members 40 and 41.
[Selection] Figure 1

Description

  The present invention relates to a ball screw circulating apparatus, and more particularly to a ball screw circulating apparatus that has a noise reduction effect during high-speed rotation, improves product precision, and is suitable for application to high-level machines.

  In general, the design structure of a ball screw in the industry is to provide a spiral ball passage on the screw shaft and to install a plurality of balls on the screw shaft in order to increase the smoothness when the screw rotates. It rolls in the ball passage and has a support effect and noise reduction effect.

  As a conventional ball screw circulation device, US Pat. No. 4,357,838 describes that circulation members are connected to both ends of rolling grooves of the ball screw circulation device to guide the rotation direction of the ball inside each circulation member. A curved arc-shaped groove is provided, and the ball passes between the inner screw shafts while contacting the outer nut body, and the rolling contact with a very small frictional force is maintained. In the above configuration, if the connection between the arc-shaped groove of the circulation member and the rolling groove in the nut body is not smooth, noise is generated due to the balls colliding with each other. If this requirement is not satisfied, the quality accuracy of the ball screw circulating apparatus used at high speed rotation cannot be improved.

US Pat. No. 4,357,838

  However, the ball screw circulating device disclosed in the specification of the aforementioned U.S. Pat. No. 4,357,838 does not have accuracy such as fitting and fixing when the circulating member is incorporated into the nut body, and needs to be improved. is there.

  Accordingly, an object of the present invention is to provide a ball screw circulating apparatus that can accurately fit and fix the circulating member to the nut body and improve the quality. Another object of the present invention is to smoothly connect the rolling groove on the two members, the circulation member and the nut body, and the arc-shaped groove for changing the rolling angle of the ball so that the balls do not collide with each other. Accordingly, it is an object of the present invention to provide a ball screw circulating device that does not generate noise.

  The ball screw circulating apparatus according to claim 1 has a cylindrical nut body having a through hole that penetrates in the axial direction in the center, and a spiral rolling groove formed on the inner surface of the through hole. The screw shaft rotatably disposed in the through hole of the nut body includes a spiral rolling groove having the same pitch as the rolling groove provided in the nut body on an outer peripheral surface thereof, and the nut body And the rolling groove provided on the outer peripheral surface of the screw shaft is opposed to each other, and is formed between the rolling groove of the nut body and the rolling groove of the screw shaft. A number of balls are aligned in a spiral tube space, and in order to solve the above problems, installation recesses are respectively provided at both ends of the rolling groove provided in the nut body, and The circulation members at both ends are fitted and arranged in the installation recesses at both ends, respectively. The installation recess includes a fitting portion protruding outward in the radial direction and a curved recess, and a communication hole is provided on the side of the through hole of the nut body to connect the installation recesses at both ends in the axial direction. An circulating member is an overhanging portion that is fitted into the fitting portion, a ball passage guiding portion that is fitted into the curved concave portion, and an angle conversion passage that includes a straight portion and a substantially ¼ arc portion continuous therewith. And a projecting portion for radial positioning projecting in a semicircular shape toward one side in the circumferential direction is provided on the projecting portion, and one end of the angle conversion passage is a nut in the circulation member at both ends. It is connected to the end of the rolling groove provided in the main body, and the other end of the angle conversion passage is connected to one end of the communication hole provided in the nut main body to form a circulation type rolling route. And the plurality of circular rolling routes Wherein the Lumpur is aligned filled.

  A ball screw circulation device according to a second aspect is the ball screw circulation device according to the first aspect, wherein the angle conversion passages of the circulation members at both ends are opened radially outward in a cross section intersecting the angle conversion passages. An elastic groove portion is provided along the angle conversion passage on the surface that is formed by a circular arc-shaped groove and faces the radially outer side of the circulation member at both ends, thereby elastically between the elastic groove portion and the angle conversion passage. The elastic wall part which acts automatically is formed.

  The ball screw circulation device according to claim 3 is the ball screw circulation device according to claim 1, wherein the upper arc surface and the lower arc surface of the outer edge of the arc-shaped groove forming the angle conversion passage are The arcuate groove has a larger radius of curvature than the inner arc surface of the arc-shaped groove.

  A ball screw circulating apparatus according to a fourth aspect is the ball screw circulating apparatus according to the first aspect, wherein a circle having a diameter larger than the diameter of the through hole is provided concentrically with the through hole on both sides of the through hole of the nut body. A circular ring-shaped recess is formed, and a sealing ring is inserted into the annular recesses on both sides from the outside in the axial direction with respect to the circulation members at both ends fitted and arranged in the installation recesses at both ends inside the annular recess. A C-shaped ring is fitted.

  According to the ball screw circulating apparatus according to claim 1 of the present invention, the circulating members at both ends are respectively fitted and arranged in the installation recesses provided at both ends of the spiral rolling groove of the nut body. The nut body installation recess includes a fitting portion that protrudes radially outward, and the circulation member includes an extension portion that is fitted into the installation recess insertion portion. Since it has a configuration in which a projecting part for radial positioning projecting in a semicircular shape toward one side in the circumferential direction is provided, the circulating members at both ends are respectively set with respect to the installation recesses at both ends of the nut body during assembly. When fitted and arranged, the circulating members at both ends do not move in the radial direction by the protruding portions for radial positioning that protrude in the circumferential direction, and the circulating members at both ends can be positioned and fixed with high precision in the radial direction. .

  According to the ball screw circulating apparatus of the second aspect, because of the above-described configuration, even a ball having a low roundness can be smoothly rolled in the curved angle conversion passage by the elastic action of the elastic wall portion. Therefore, it is possible to prevent the generation of noise when the balls collide with each other, and to exhibit a quieter ball screw rolling effect.

  According to the ball screw circulating apparatus of the third aspect, because of the above configuration, the ball contacts only a smaller area in the angle conversion passage, so that the frictional force and noise are reduced.

  According to the ball screw circulating apparatus of the fourth aspect, because of the above configuration, the circulating members at both ends can be accurately positioned and fixed in the axial direction.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a ball screw circulating apparatus according to the present invention. FIG. 2 is a perspective view showing a state after the assembly of the ball screw circulating apparatus of the present invention. FIG. 3 is a side view of the ball screw circulating apparatus of the present invention. FIG. 4 is an axial sectional view taken along line AA in FIG. 5 is a cross-sectional view taken along line BB in FIG.

  As shown in FIGS. 1 and 2, the ball screw circulating apparatus according to the embodiment of the present invention includes a nut body 10, a screw shaft 20 that is rotatably provided inside the nut body 10, a plurality of balls 30, and a nut body 10. The circulating member 40 disposed at the front of the nut, the circulating member 41 disposed at the rear of the nut body 10, the thin plate-like sealing ring 50 and the C-shaped ring 52 disposed at the front of the nut body 10, and the nut body 10 is composed of a thin plate-like sealing ring 51 and a C-shaped ring 53 arranged at the rear part.

  The nut body 10 has a cylindrical shape (shaft cover shape), and a through hole 12 is provided in the center in the axial direction. A flange is provided at one end of the nut body 10 in the axial direction. A plurality of through holes 11 are provided in the flange, and these through holes 11 are used when screwing and fixing on the seat body of the linear guide device.

  A spiral rolling groove 13 is formed on the inner surface of the through hole 12 (see FIG. 4). On both sides (front side and rear side) of the through hole 12 of the nut body 10, circular annular recesses 15, 15 that are concentric with the through hole 12 and have a diameter larger than the diameter of the through hole 12 are formed. At both end positions of the rolling groove 13 at the bottom of the recess 15, installation recesses 14 and 14 for circulation members 40 and 41 formed by cutting out the end of the rolling groove 13 are provided, respectively. As shown in FIGS. 1 and 3, the installation recess 14 for the circulating member of the nut body 10 includes a recessed insertion portion 17 having a shallow depth in the axial direction projecting radially outward and a curved recess having a deep recess in the axial direction. 18 is provided.

  Further, as shown in FIG. 1, the nut body 10 is provided with a communication hole 19 that communicates both bottom portions of the installation recesses 14, 14 along the axial direction. Functions as a return path. The screw shaft 20 includes a spiral rolling groove having the same pitch as the rolling groove 13 provided in the nut body 10 on the outer peripheral surface thereof.

  FIG. 6 is a perspective view showing the circulation member and the ball from the front (the radially outer side of the nut body 10), and FIG. 7 is a perspective view showing the circulation member and the ball from the back (the radially inner side of the nut body 10). As shown in FIGS. 6 and 7, the front and rear circulation members 40 and 41 are integrally formed of a plastic material and have the same structure. Therefore, the following description will be made using the circulation member 40. In FIG. 6, an overhanging portion 42 is formed on one end of the upper portion of the main body of the circulation member 40 so as to protrude forward (toward the radial direction of the nut main body 10). A protrusion 45 for positioning in the radial direction is formed so as to protrude in a semicircular shape toward one side (one side in the circumferential direction of the nut body 10).

  Further, a ball passage guiding portion 43 formed in a semi-columnar shape is provided at the other end (right end) of the circulation member 40. Further, as shown in FIG. 7, an arc piece 44 extending from the lower part of the ball passage guiding portion 43 to the left facing the main body of the circulation member 40 is provided, and the arc piece 44, the circulation member 40, As shown in the cross-sectional view of FIG. 9 and the circulation member 41 of FIG. 1, an angle conversion passage 46 configured by a straight portion and a substantially ¼ arc portion continuous therewith is provided. As shown in the cross-sectional views intersecting the angle conversion passage 46 in FIG. 6 and FIG. 8, the angle conversion passage 46 is formed by an arcuate groove whose front (the radially outer side of the nut body 10) is opened.

  6, a semicircular protrusion having a semicircular cross section as shown in FIGS. 7 and 8 is formed on the right side of the back surface of the main body of the circulation member 40 (the surface facing the through hole 12 inside the nut main body 10). 6 and 8, an elastic groove 48 is provided along the upper portion of the angle conversion passage 46 on the front surface of the circulation member 40 (the surface facing the radially outer side of the nut body 10). It has been.

  As shown in FIGS. 8 to 10, at the time of assembly, the front and rear circulation members 40 and 41 are fitted and arranged in the front and rear installation recesses 14 and 14 provided in the nut body 10, respectively. The protruding portion 42 of the circulation member 40 is inserted into the fitting portion 17 of the installation recess 14, and the semi-columnar ball passage guide portion 43 of the circulation member 40 is inserted into the curved recess 18 of the installation recess 14.

  When the front and rear circulation members 40 and 41 are fitted and arranged in the installation recesses 14 and 14, one end of the angle conversion passage 46 is connected to the end of the rolling groove 13 provided in the nut body 10 in the circulation members 40 and 41. In addition to being connected, the other end of the angle conversion passage 46 is connected to one end of a communication hole 19 provided in the nut body 10 in the axial direction (see FIGS. 1 and 9). As a result, one end of the spiral rolling groove 13 of the nut body 10, the angle conversion passage 46 of the circulation member 40, and one end of the communication hole 19 of the nut body 10 communicate with each other, and the spiral rolling groove of the nut body 10. 13, the angle conversion passage 46 of the circulation member 40, and the other end of the communication hole 19 of the nut body 10 communicate with each other. It is converted into a rolling route that is curved and passes through the communication hole 19 (see FIGS. 1 and 9) directed in the axial direction, and the rolling route is curved again by the circulation member 41 on the opposite side to be changed into a spiral rolling route. In general, a circular rolling route is formed.

  The sealing ring 50 is inserted from the front into the annular recess 15 provided in the front portion of the through hole 12 of the nut body 10, and the C-shaped ring 52 is further fitted into the front annular recess 15 from the front. The sealing ring 50 is inserted from the rear into the annular recess 15 provided in the rear part of the twelve, and the C-shaped ring 53 is further fitted from the rear.

  As described above, the coupling between the projecting portion 42 of the front and rear circulation members 40 and 41 and the fitting portion 17 of the installation recess 14 of the nut body 10 is such that the projecting portion 45 having a semicircular shape is formed on the projecting portion 42. Therefore, the front and rear circulation members 40 and 41 do not move in the radial direction, and are positioned and fixed with high precision in the radial direction. Further, the front and rear sealing rings 50 and 51 and the front and rear C-shaped rings 52 and 53 are incorporated outside, respectively, so that they can be positioned and fixed with high accuracy in the axial direction.

  Further, an oil hole 16 is provided in the side peripheral surface of the flange of the nut body 10 (see FIG. 5), and lubricating oil is injected from the oil hole 16. A large number of balls 30 are installed in the rolling groove 13. When the screw shaft 20 is penetrated into the through hole 12, the spiral rolling groove 13 provided in the nut body 10 and the outer peripheral surface of the screw shaft 20 are provided. A large number of balls 30 are aligned and arranged in a spiral tube space formed between the rolling groove 13 of the nut body 10 and the rolling groove 13 of the screw shaft 20. (See FIG. 8). Therefore, the nut body 10 and the screw shaft 20 are provided to be rotatable with respect to each other. A large number of balls 30 are also arranged in the angle conversion passages 46 and the communication holes 19 of the front and rear circulation members 40 and 41 (see FIGS. 1 and 2). Further, the semicircular protrusions 47 of the front and rear circulation members 40 and 41 are screwed into rolling grooves provided on the outer peripheral surface of the screw shaft 20 (see FIG. 8). Therefore, a plurality of balls 30 are aligned and filled in the circulating rolling route. Thereby, each ball 30 rolls while circulating between the rolling groove 13 and the front and rear circulation members 40 and 41.

  As shown in the enlarged partial structure of FIG. 10, the elastic groove portions 48 provided in the front and rear circulation members 40 and 41 are arranged on the outer side in the radial direction, and elastically between the elastic groove portion 48 and the angle conversion passage 46. An elastic wall portion 49 that acts is formed, and the ball 30 that is not high in roundness can be smoothly rolled in the curved angle conversion passage 46 by this elastic action, and the balls 30 collide with each other. This prevents the generation of abnormal noise and produces a quieter ball screw rolling effect.

  Further, in the embodiment of the present invention, as shown in FIG. 10, the upper arc surface a near the outer edge of the arc-shaped groove forming the angle conversion passage 46 (outside in the radial direction of the nut body 10) and the lower side. The side arc surface b has a larger radius of curvature than the inner arc surface c of the arc-shaped groove (in the radial direction of the nut body 10). With this configuration, since the ball 30 contacts only a smaller area in the angle conversion passage 46, friction force and noise are reduced. In addition, after the ball 30 enters the angle conversion passage 46, the gap m between the ball 30 and the nut body 10 is retained larger than the gap n between the ball 30 and the angle conversion passage 46, and the metal ball 30 rotates. Since the ball 30 does not hit the wall surface of the metal nut body 10 during movement and the balls 30 come into contact with the circulating members 40 and 41 before and after the plastic material, the overall noise can be made quieter.

  As described above, in the structure of the ball screw circulation device of the present invention, the connection design between the front and rear circulation members 40 and 41 and the installation recess 14 of the nut body 10 is improved, and the ball rolls more gently in the circulation route. It can be applied to a more precise rotation function, and the industrial utility value is greatly enhanced.

It is a disassembled perspective view of the ball screw circulating apparatus of this invention. It is a perspective view which shows the state after the assembly of the ball screw circulating apparatus of this invention. It is a side view of the ball screw circulating apparatus of the present invention. It is sectional drawing fractured | ruptured by the AA line of FIG. It is sectional drawing fractured | ruptured by the BB line of FIG. It is a perspective view which shows a circulation member and a ball from the front. It is a perspective view which shows a circulation member and a ball from the back. It is a transverse cross-sectional view of a circulation member. It is a longitudinal direction sectional view showing a partial structure of a circulation member It is a horizontal direction expanded sectional view which shows the partial structure of a circulation member.

Explanation of symbols

10 Nut body
11 through holes
12 Through hole
13 Rolling groove
14 Installation recess
15 annular recess
16 Oil hole
17 Insertion part
18 Curved recess
19 Communication hole
20 Screw shaft
30 balls
40 Circulating members
41 Circulating members
42 Overhang
43 Ball passage guide
44 Arc Piece
45 Protrusion
46 Angle conversion passage
47 Semicircular ridge
48 Elastic groove
49 Elastic wall
50 Sealing ring
51 Sealing ring
52 C-shaped ring
53 C-shaped ring
a Upper arc surface
b Lower arc surface
c Inner arc surface

Claims (4)

A cylindrical nut body has a through-hole penetrating in the axial direction in the center and a spiral rolling groove formed in the inner surface of the through-hole, and is freely rotatable in the through-hole of the nut body A screw shaft disposed on the outer circumferential surface of the screw shaft, the spiral rolling groove having the same pitch as the rolling groove provided on the nut body, and the rolling groove and the screw provided on the nut body. A large number of balls are aligned in a spiral tube space formed between the rolling groove of the nut body and the rolling groove of the screw shaft, while facing the rolling groove provided on the outer peripheral surface of the shaft. In the arranged ball screw circulation device,
Installation recesses are respectively provided at both ends of the rolling groove provided in the nut body, and circulating members at both ends are respectively fitted and arranged in the installation recesses at both ends,
The installation recess includes a fitting portion and a curved recess that project radially outward, and a communication hole that connects the installation recesses at both ends in the axial direction is provided on the side of the through hole of the nut body.
The angle formed by the circulating members at both ends formed by an overhanging portion that is fitted into the fitting portion, a ball passage guide portion that is fitted into the curved concave portion, and a linear portion and a substantially ¼ arc portion that is continuous therewith. A projecting portion for radial positioning that projects in a semicircular shape toward one side in the circumferential direction on the overhang portion,
In the circulating members at both ends, one end of the angle conversion passage is connected to an end of the rolling groove provided in the nut body, and the other end of the angle conversion passage is provided in the nut body. A ball screw circulating apparatus characterized in that a circulating rolling route is formed by being connected to one end of a hole, and the plurality of balls are aligned and filled in the circulating rolling route.   The angle conversion passages of the circulation members at both ends are formed by arc-shaped grooves whose outer sides in the radial direction are opened in a cross section intersecting the angle conversion passages, and the surfaces facing the radially outer sides of the circulation members at both ends, The elastic wall portion that elastically acts between the elastic groove portion and the angle conversion passage is formed by providing an elastic groove portion along the angle conversion passage. Ball screw circulation device.   The upper arc surface and the lower arc surface of the outer edge portion of the arc-shaped groove forming the angle conversion passage have a larger radius of curvature than the inner arc surface of the arc-shaped groove. The ball screw circulating apparatus according to claim 1. Circular annular recesses that are concentric with the through hole and larger in diameter than the through hole are formed on both sides of the through hole of the nut body, and are fitted into the installation recesses at both ends inside the annular recess. 2. The ball screw circulating apparatus according to claim 1, wherein a sealing ring and a C-shaped ring are fitted into the annular recesses on both sides of the circulating members at both ends from the outside in the axial direction. .

Images