TWI390123B - Angular roller bearing, and method of manufacturing cross roller bearing and angular roller - Google Patents

Abstract

This invention provides intercrossing roller bearing, angular contact roller bearing and fabricating methods thereof, which differently uses the intercrossing roller bearing, angular contact roller bearing based on the required rigidity and the inserting space with less parts structure. Said intercrossing roller bearing having rolling body (25) between the inner ring (14Ir) and the outer ring (14Or) adopts both the inner ring (14Ir) and the outer ring (14Or) and.

Description

Angle contact roller bearing, and manufacturing method of cross roller bearing and angular contact roller bearing

The present invention relates to a cross roller bearing, an angular contact roller bearing, and a method of manufacturing a cross roller bearing and an angular contact roller bearing.

In the first drawing of Patent Document 1, a reduction gear incorporating a crossed roller bearing is disclosed.

Further, in Fig. 4 of the same patent document, a reduction gear incorporating an angular contact roller bearing is disclosed.

[Patent Document 1]: JP-A-2003-74646 (Fig. 1 and Fig. 4)

Since the crossed roller bearing and the angular contact roller bearing are different in function and structure, the shapes of the inner and outer rings are different, and are individually designed or manufactured. Therefore, the production cost becomes high.

The problem to be solved by the present invention is to reduce the number of parts for manufacturing a crossed roller bearing and an angular contact roller bearing, and to provide a cross roller bearing and an angular contact roller bearing at low cost.

The present invention solves the above problems by the following technique, and is a cross roller bearing having a rolling element between an inner ring and an outer ring, wherein both inner ring and outer ring are surrounded by a rolling surface of the inner ring and the outer ring. The center of the space is a bearing composed of the first and second inner rings and the outer ring which are respectively divided along the surface perpendicular to the axial direction of the supported body.

In the case of the crossed roller bearing, it is assumed that the inner ring and the outer ring are respectively divided by the center of the space surrounded by the rolling faces of the inner ring and the outer ring, and are respectively divided along the plane perpendicular to the axial direction of the supported body. The second inner ring and the outer ring are formed. As a result, the angular contact roller bearing can be manufactured by using the inner ring and the outer ring and the rolling element opposed to the crossed roller bearing, so that the manufacturing cost of the bearing can be reduced. Further, when the crossed roller bearing needs to be shortened in size, the inner ring/outer ring and the rolling element can be used as the crossed roller bearing, and it is necessary to improve the rigidity or capacity of the supported body by The above parts are used as angular contact roller bearings.

That is, according to the present invention, the inner and outer rings of the crossed roller bearing and the rolling elements are transferred to the angular contact roller bearing, and the rigidity of the supported body is matched with the part structure having less commonality. The above two bearings can be used at low cost, regardless of the specifications of the required mode.

According to the present invention, it is possible to reduce the number of parts in manufacturing the crossed roller bearing and the angular contact roller bearing, and to provide the cross roller bearing and the angular contact roller bearing at low cost.

Hereinafter, an embodiment of the present invention will be described based on Fig. 1 .

First, a cross roller bearing 14 according to an embodiment of the present invention will be described. Fig. 1(a) is a longitudinal sectional view showing the crossed roller bearing 14.

The crossed roller bearing 14 has an outer ring 14Or, an inner ring 14Ir, and a roller (rolling element) 25 disposed between the outer ring 14Or and the inner ring 14Ir.

In the axial center of the inner circumference of the outer ring 14Or, rolling surfaces 21A and 22A which are orthogonal to each other inside the outer ring 14Or are formed. At the center of the axial direction of the outer circumference of the inner ring 14Ir, rolling surfaces 23A and 24A which are orthogonal to each other inside the inner ring 14Ir itself are formed.

The outer ring 14Or passes through the center 26A of the space 26 surrounded by the rolling faces 21A to 24A of the outer ring 14Or and the inner ring 14Ir, and is supported along the inner peripheral side inserted into the inner peripheral side of the crossed roller bearing 14 (omitted The plane X perpendicular to the plane P is shown divided into two outer rings, that is, the first outer ring 21 and the second outer ring 22. The first outer ring 21 and the second outer ring 22 have a cross section (the cross section shown in Fig. 1) parallel to the axial direction X, and have a surface in which one vertex of the square is cut at 45 degrees as the rolling surface. 21A, 22A shape.

The inner ring 14Ir is divided into two by a center 26A of the space 26 surrounded by the outer ring 14Or and the rolling surfaces 21A to 24A of the inner ring 14Ir, along a plane P perpendicular to the axial direction X of the supported body (not shown). The inner ring, that is, the first inner ring 23 and the second inner ring 24 are provided. The first inner ring 23 and the second inner ring 24 are also parallel to the axial direction X (the cross section shown in Fig. 1), and have a surface in which one vertex of the square is cut at 45 degrees. The shape of the faces 23A, 24A.

In other words, the cross sections parallel to the respective axial directions X of the first outer ring 21, the second outer ring 22, the first inner ring 23, and the second inner ring 24 are the centers of the spaces 26 surrounded by the rolling surfaces 21A to 24A. 26A is a point-symmetric shape centered on the center.

The roller (rolling element) 25 is formed of a cylindrical shape having the same diameter and height (the axial length of the rolling element 25) (strictly speaking, the diameter is only slightly smaller than the height), and is mounted every other 90 degrees. In.

Next, a case where the crossed roller bearing 14 is effectively used as the pair of angular contact roller bearings 16 and 18 will be described with reference to Fig. 1(b). In addition, in the first figure (b), the same reference numerals are attached to the parts (the same parts) corresponding to the parts of the crossed roller bearing 14 of Fig. 1(a).

One of the angular contact roller bearings 16 is opposed to the first and second inner rings and the outer rings 21 to 24 of the crossed roller bearing 14 of Fig. 1(a) by the rolling surfaces 21A and 24A. The outer ring 21, the second inner ring 24, and the roller 25 are formed. All the rollers of the roller 25 that are the same as the rollers 25 constituting the crossed roller bearing 14 are all loaded in the same direction (the direction in which the oblique axial direction Z1 is a right angle).

The other angular contact roller bearing 18 is opposed to the first and second inner rings and the outer rings 21 to 24 of the crossed roller bearing 14 of Fig. 1(a) by the rolling surfaces 22A and 23A. 2 The outer ring 22, the first inner ring 23, and the roller 25 are formed. All of the rollers of the roller 25 that are the same as the rollers 25 constituting the crossed roller bearing 14 are mounted in the same direction (direction in which the oblique axial direction Z2 is a right angle).

By using the above-described cross roller bearing 14 in combination with the components of the pair of angular contact roller bearings 16, 18, the number of parts of the two bearings 14, (16, 18) can be reduced, and the cross roller bearing can be provided at low cost. 14 and angular contact roller bearings 16, 18. Moreover, a method of manufacturing the crossed roller bearing 14 and the angular contact roller bearings 16, 18 can be determined, characterized in that the space 26 is surrounded by the rolling faces 21A to 24A of the inner rings 23, 24 and the outer rings 21, 22. The center 26A and the first and second inner rings and the outer rings 21 to 24 which are respectively divided along the surface P perpendicular to the axial direction X of the supported body and the rolling elements 25 are manufactured, and the cross roller bearing 14 is manufactured. 1. In the second inner ring and the outer rings 21 to 24, angular contact roller bearings 16, 18 are manufactured from a pair of inner rings 24, 23, outer rings 21, 22, and rolling elements 25 opposed to the rolling surfaces 21A to 24A. .

Further, in Fig. 1, the cross-sectional shapes of the inner ring and the outer rings 21 to 24 of the crossed roller bearing 14 and the angular contact roller bearings 16 and 18 are point symmetrical, but the inner ring of the crossed roller bearing 14 and The cross-sectional shape of the outer rings 21 to 24 may not be point symmetrical.

Hereinafter, a combination of the shapes of the first and second inner rings and the outer rings 21 to 24 constituting the crossed roller bearing 14 will be described.

Fig. 2 is a schematic cross-sectional view showing a combination example of the first and second inner rings and the outer rings 21 to 24 of the crossed roller bearing 14.

Embodiments (a) to (g) shown in Fig. 2 will be described.

In the embodiment (a), the length 12 of the cross-sectional shape of the first and second inner rings and the outer rings 21a to 24a in the radial direction is longer than the length 11 of the axial direction. Further, it is characterized in that the outer corner portions of the first outer ring 21a and the second outer ring 22a have roundness (R) (rounded corners).

In the embodiment (b), the axial length 13 of the cross-sectional shape of the inner ring and the outer rings 21b to 24b is longer than the length 14 in the radial direction. Further, it is characterized in that the outer corners of the first outer ring 21b and the second outer ring 22b have roundness.

In the embodiment (c), as in the embodiment (b), the axial length 13 of the second inner ring and the outer rings 22c and 24c is longer than the length 14 in the radial direction. Further, it is characterized in that the outer corner portions of the first outer ring 21c and the second outer ring 22c have roundness. However, since the length 15 of the axial direction of the first inner ring and the outer rings 21c and 23c is longer than the length 13 of the axial direction of the second inner ring and the outer rings 22c and 24c, it is different from the embodiment (b).

In the embodiment (d), the axial length of the crossed roller bearing 14 is (the length 17 of the axial direction of the first outer ring 21d) < (the length of the axial direction of the second inner ring and the outer rings 22d, 24d 16) ) < (the length of the axial length 15 of the first inner ring 23d). Further, it is characterized in that the outer corners of the first outer ring 21d and the second outer ring 22d have roundness.

In the embodiment (e), the axial length of the crossed roller bearing 14 is (the length 17 of the axial direction of the first inner ring 23e) < (the length of the axial direction of the second inner ring and the outer rings 22e, 24e 16) ) < (the length of the axial direction 15 of the first outer ring 21e). Further, it is characterized in that the outer corners of the first outer ring 21e and the second outer ring 22e have roundness.

In the embodiment (f), the length 18 of the first inner ring 23f in the radial direction is longer than the length 17 of the axial direction. The lengths 17 of the other inner and outer rings 21f, 22f, and 24f in the radial direction are the same as the lengths 17 of the axial direction. Further, it is characterized in that the outer corners of the first outer ring 21f and the second outer ring 22f have roundness.

In the embodiment (g), the length 18 of the first outer ring 21g in the radial direction is longer than the length 17 of the axial direction. The length 17 of the second outer ring 22g, the first inner ring 23g, and the second inner ring 24g in the radial direction is the same as the length 17 in the axial direction. Further, it is characterized in that the outer corners of the first outer ring 21g and the second outer ring 22g have roundness.

In this manner, the first and second inner rings and outer rings 21a to 24a of the crossed roller bearings 14a to 14g, the first and second inner rings and the outer rings 21b to 24b, ..., the first and second inner rings, and the outer The relationship between the size and shape of the rings 21g to 24g and the surrounding members when the crossed roller bearings 14a to 14g (or the angular contact roller bearings formed using the components of the crossed roller bearing) are incorporated in a reducer or the like , can be changed as appropriate. However, in order to convert these crossed roller bearings 14a to 14g as a pair of angular contact roller bearings (not shown), the first and second inner and outer rings 21a to 24a, 21b to 24b, ... It is necessary that 21g to 24g are divided by the centers 26Aa to 26Ag of the spaces 26a to 26g surrounded by the rolling surfaces of the inner and outer rings, and along the faces Pa to Pg perpendicular to the axial direction X of the supported body.

Therefore, although not shown, each of the crossed roller bearings 14a to 14g can be used as an angular contact roller bearing including the first outer rings 21a to 21g and the second inner rings 24a to 24g with respect to the rolling surface. Further, the same angular roller bearing 14a to 14g can be used as the angular contact roller bearing including the second outer rings 22a to 22g and the first inner rings 23a to 23g which are opposed to each other.

Next, an embodiment in which the cross roller bearing 14 or the angular contact roller bearings 16 and 18 shown in Fig. 1 are incorporated in the speed reducers G1 and G2 will be described.

Fig. 3 is a longitudinal sectional view showing the reduction gear G1 incorporated in the crossed roller bearing 14.

Three eccentric bodies 42 (42A, 42B, 42C) having a phase difference of 120° are integrally formed on the crankshaft (input shaft) 41 of the reduction gear G1. The crankshaft 41 is rotatably supported by the wheel carrier 48 and the outer casing 50 via a pair of bearings 55 and 56.

In each of the eccentric bodies 42, three planetary gears 40 (40A, 40B, 40C) are attached via the rollers 43 (43A, 43B, 43C). The planetary gears 40 are internally in meshed with the internal gear 44.

Further, the internal gear 44 is integrally attached to the inner peripheral side of the outer casing 50.

A plurality of inner roller holes 45 (45A, 45B, 45C) are formed in the planetary gear 40 in the axial direction, and the inner roller 46 and the inner pin 47 are inserted. The inner pin 47 is coupled to the carrier 48 at one end side in the axial direction. The carrier 48 is rotatably supported by the outer casing 50 by the crossed roller bearing 14 (hereinafter, it will be described in detail with reference to Fig. 5).

According to the above configuration, the swing component of each of the planetary gears 40 can be absorbed by the loose fitting of the inner roller hole 45 and the inner roller 46 of each of the planetary gears 40, and can be discharged from the carrier 48 by the fixed internal gear 44. The rotation of the rotation component of the planetary gear 40 at the time. Further, the rotation of the internal gear 44 when the planetary gear 40 is rotated may be restricted as an output and may be discharged.

Next, the reduction gear G2 incorporating the angular contact roller bearings 16 and 18 shown in Fig. 1 is shown in Fig. 4.

The side ends of the planetary gears 240 coupled to the crankshaft 241 are provided with first and second wheel carriers 248 (248A, 248B).

The crankshaft 241 is rotatably supported with respect to the wheel carrier 248 by a pair of bearings 255 and 256. Further, the wheel carrier 248 is rotatably supported by the outer casing 250 by a pair of angular contact roller bearings 16 and 18 (hereinafter, it will be described in detail with reference to Fig. 6).

The other structure is basically the same as the configuration of the speed reducer G1 using the above-described cross roller bearing 14 (Fig. 3), so that the portion corresponding to the third figure (the functionally identical portion) is attached to the second position. The same number of the same drawing number is omitted, and the repeated description is omitted.

Here, the cross roller bearing 14 and the angular contact roller bearings 16 and 18 incorporated in the reduction gears G1 and G2 will be described in more detail by using an enlarged view (Fig. 5 and Fig. 6).

Fig. 5 is an enlarged view showing a portion surrounded by V in Fig. 3, and Fig. 6 is an enlarged view showing a portion surrounded by VI in Fig. 4.

In addition, in the fifth drawing and the sixth drawing, the parts corresponding to the crossed roller bearing 14 and the angular contact roller bearing 16 and 18 shown in Figs. 1(A) and (B) are shown by the same reference numerals. The same parts.

The crossed roller bearing 14 of the support carrier (supported body) 48 shown in Fig. 5 has a roller between the first inner ring 23, the second inner ring 24, the first outer ring 21, and the second outer ring 22. 25.

Both the first inner ring 23 and the second inner ring 24, the first outer ring 21, and the second outer ring 22 pass through the center of the space 26 surrounded by the rolling surfaces 21A to 24A of the inner ring/outer ring, and along The first and second inner rings and the outer rings 21 to 24 which are respectively divided from the plane P perpendicular to the axial direction X of the wheel carrier (supported body) 48 are formed.

The first and second inner rings and the outer rings 21 to 24 have a point-symmetric cross-sectional shape centering on the center of the space 26 surrounded by the rolling surfaces 21A to 24A.

The inner ring and the outer ring of the angular contact roller bearing 16 shown in Fig. 6 are in the first and second inner rings and the outer rings 21 to 24 of the above-described crossed roller bearing 14, and are included in the carrier (supported by the carrier). The axial cross-sections of 248A and 248B are formed by the first outer ring 21 and the second inner ring 24 facing each other by the rolling surfaces 21a and 24a.

Similarly, in the inner ring and the outer ring of the angular contact roller bearing 18, in the first and second inner rings and the outer rings 21 to 24 of the crossed roller bearing 14, the first inner surface facing the rolling surfaces 22a and 23a The ring 23 and the second outer ring 22 are configured to each other.

The roller 25 having the same shape as the roller 25 using the crossed roller bearing 14 is interposed between the rolling surfaces 21A to 24A of the inner and outer rings 21 to 24.

According to the above, the inner and outer rings 21 to 24 of the crossed roller bearing 14 and the roller 25 can be transferred to the angular contact roller bearings 16, 18.

That is, the number of parts when manufacturing the crossed roller bearing 14 and the angular contact roller bearing 16, 18 can be reduced, and the crossed roller bearing 14 and the angular contact roller bearing 16, 18 are provided at low cost. Further, it is also possible to determine a method of manufacturing the parts in which the two bearings 14 and (16, 18) are used in combination.

Thereby, when it is necessary to shorten the size of the speed reducer G1, it can be used as the crossed roller bearing 14. Further, when it is necessary to increase the rigidity or capacity of the speed reducer G2, it can be used in combination as a pair of angular contact roller bearings 16, 18.

14. . . Crossed roller bearing

14Or. . . Outer ring

14Ir. . . Inner ring

16, 18. . . Angular contact roller bearing

21, 22. . . First outer ring, second outer ring

23, 24. . . First inner ring, second inner ring

21A～24A. . . Rolling surface

25. . . Roller (rolling body)

26. . . space

26A. . . Center of space

X. . . Axial

P. . . a plane perpendicular to the axial direction

Fig. 1 is a longitudinal sectional view showing a crossed roller bearing according to the present invention.

Fig. 2 is a schematic cross-sectional view showing the insertion of the inner ring and the outer ring of the crossed roller bearing according to the present invention.

Fig. 3 is a longitudinal sectional view of a reduction gear in which the crossed roller bearing of the present invention is inserted.

Fig. 4 is a longitudinal sectional view showing a reduction gear in which the crossed roller bearing of the present invention is inserted as an angular contact roller bearing.

Fig. 5 is an enlarged view of a portion A of the speed reducer G1 shown in Fig. 4.

Fig. 6 is an enlarged view of a portion B of the speed reducer G2 shown in Fig. 5.

14. . . Crossed roller bearing

14Or. . . Outer ring

14Ir. . . Inner ring

16, 18. . . Angular contact roller bearing

21, 22. . . First outer ring, second outer ring

23, 24. . . First inner ring, second inner ring

21A～24A. . . Rolling surface

25. . . Roller (rolling body)

26. . . space

26A. . . Center of space

X. . . Axial

P. . . a plane perpendicular to the axial direction

Claims (2)

An angular contact roller bearing is formed by using the inner ring, the outer ring and the rolling element in a crossed roller bearing having a rolling element between the inner ring and the outer ring; and the above-mentioned cross roller bearing is Both the inner ring and the outer ring are first and second inner rings which are respectively divided by a surface which passes through a center of a space surrounded by the rolling surfaces of the inner ring and the outer ring and which is perpendicular to the axial direction of the supported body. The angular contact roller bearing is an inner ring formed by a pair of inner rings and outer rings of the first and second inner rings and the outer ring of the crossed roller bearing facing the rolling surface A rolling element having the same shape as the rolling element of the above-described crossed roller bearing, and the outer ring. A method for manufacturing a crossed roller bearing and an angular contact roller bearing, characterized in that a cross roller bearing is manufactured by a first and a second inner ring and an outer ring and a rolling element, and the first and second inner rings are The outer ring is divided along the surface perpendicular to the axial direction of the supported body by the center of the space surrounded by the rolling faces of the inner ring and the outer ring; by the first and second inner rings and the outer ring An angular contact roller bearing is manufactured by a pair of inner rings, outer rings, and the above-described rolling elements having opposite rolling surfaces.