JP2656824B2 - Bearing ring of swivel bearing and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application field> The present invention relates to a split raceway ring used for a large bearing such as a cutter head bearing for a tunnel excavator and a turntable bearing for a super-large construction machine, and the like. It relates to a manufacturing method.

<Conventional Technology> The bearing ring of a large slewing bearing is provided so as to be separable in order to make it possible to manufacture a very large product and to facilitate handling during transportation and repair.

Previously, the applicant has proposed a slewing bearing shown in FIG. 10 as an application of such a slewing bearing race (Japanese Utility Model Application No. 62-19517 (Japanese Utility Model Application Laid-Open No. 1-98917)). This swivel seat bearing includes an inner ring 102 having an annular fitting portion 101 on the outer periphery and an annular fitting portion fitted on the inner periphery to the fitting portion 101 of the inner ring 102.
An outer ring 104 having an inner ring 102, and a fitting portion 101 of the inner ring 102.
And a surface 105 axially opposed to the fitting portion 103 of the outer ring 104.
Pairs of thrust rollers 111 and 112 held by a retainer 109 and a retainer 110 disposed between the inner ring 102 and the outer ring 104, and between the inner ring 102 and the outer ring 104. The inner ring 102 and the outer ring 104 are rotatably supported via a radial roller 116 held by a retainer 115 disposed between the 113 and the peripheral surface 114. The inner ring 102 is formed by a first inner ring portion 1 divided by a plane perpendicular to the axis.
02a, a second inner ring portion 102b, and a third inner ring portion 102c.
1, 2, 3 inner ring portions 102a, 102b, 102c, as shown in FIG. 11,
Two planes each including the axis (102a-1, 102a-2, 102b
-1, 102b-2, 102c-1, 102c-2), and the first inner ring portion 102a, the second inner ring portion 102b, and the third inner ring portion 102c shift the phases of the radial divided surfaces by 90 ° from each other, As shown in FIG. 10, the outer ring 104 is integrally detachably connected, and the outer ring 104 is divided by a plane perpendicular to the axis.
As shown in FIG. 12, the first outer ring portion 104a and the second outer ring portion 104b each have two planes (104a-1, 104a-2, 104b) each including the axis. -1, 104a-2), and the first outer ring portion 104a and the second outer ring portion 104b are integrally detachably coupled with each other by shifting the phases of the radially divided surfaces by 90 °. Further, the retainers 109, 11
0 and 115 were also divided by a plane containing the respective axes. Then, the first, second and third inner ring portions 102a, 102b and 102c and the first and second outer ring portions
For the production of 104a, 104b, etc., one annular member 120 as shown in FIG. 13 in which a later processing allowance is added to a target shape is produced by forging, etc. As shown in the figure, a plurality of arc-shaped track members cut radially
121, 122 and then a plurality of said track members 121, 122
Then, as shown in FIG. 15, the plurality of arc-shaped track members 121 and 122 are assembled again in an annular shape with the corresponding end surfaces 121a and 122a aligned with each other. This is performed by subjecting the assembled product to turning or grinding by integrated processing to form a target perfect circular shape. Further, the plurality of arc-shaped track members 121 and 122 are individually processed so as to form a part of a perfect circle, and are assembled into a ring shape. The heat treatment such as induction hardening performed to obtain the required hardness of the raceway surface is performed by, for example, an annular member before cutting.
It was performed in 120 states. In the above cutting, a large cutting margin (see t in FIG. 14) was required.

<Problems to be Solved by the Invention> However, the above-mentioned conventional bearing ring of the slewing bearing requires a large cutting allowance t in the cutting step as described above when manufacturing the same, so that two arc-shaped parts after cutting are required. When the track members 121 and 122 are assembled into a ring by matching the corresponding end faces 121a and 122a respectively, as shown in FIG. 15, these track members are no longer circular but have an elliptical shape, For this reason, the subsequent round processing, ie, turning or grinding, becomes uneven thickness processing, making the processing difficult and increasing the allowance (see the area h in FIG. 16). There is a problem that it is difficult to obtain accuracy such as roundness. In addition, since uneven thickness processing is unavoidable in order to process into a perfect circle in this way, if induction hardening is performed at the stage of the annular member before cutting,
As shown in FIG. 16, the hardened hard layer q of the raceway member formed from the surface to a substantially uniform depth by the induction hardening is subjected to the above-mentioned uneven thickness processing (the area h in the figure is cut and the rounded processing surface is cut). i is formed) so that some parts are deeply cut (see point j in the figure) and some places are shallow (see k in the figure), so that they are unevenly cut off, and are formed by the above-mentioned round processing. However, there is a problem that a hardened hardened layer having a uniform depth cannot be secured under the peripheral surface of the steel sheet. Further, if the circular track members 121 and 122 are separately subjected to the perfect circular processing, it is difficult to perform the processing itself, for example, it is difficult to perform the centering in the processing, and it is difficult to perform the processing with high precision like the integral processing. There was a problem. In addition, it is also possible to cut and manufacture an annular member having a shape in which a cutting allowance is added in advance so as not to cause uneven thickness processing after cutting, but in this case, a special technique called oval forging was required. .

Further, in the above-mentioned conventional race, the end surfaces 121a, 122a of the arc-shaped race members 121, 122 which make up the race are formed simply by a plane including a shaft. At the time of repair after completion of the bearing ring, assembly after transportation, etc., there has been a problem that the positioning between the bearing members 121 and 122 (see the arrow in FIG. 17) cannot be easily performed.

Therefore, an object of the present invention is to eliminate the need for a special technique such as elliptical forging in the manufacture thereof, and to perform turning and grinding performed after assembling into an annular shape without performing uneven thickness processing as in the past. Therefore, the orbit of the splittable swivel bearing can be easily and accurately manufactured into a perfect circle, and even if heat treatment is performed before cutting, the heat-treated layer can be uniformly left under the processing surface. To provide a wheel.

Another object of the present invention is to provide a bearing ring of a swivel bearing that can be easily and accurately positioned in a ring shape when the ring is assembled.

Another object of the present invention is to provide a method of manufacturing a bearing ring of a swivel bearing that can be easily and accurately manufactured in a perfect circle.

<Means for Solving the Problems> In order to achieve the above object, the orbital ring of the swivel bearing according to the present invention includes a plurality of arc-shaped orbital members formed by cutting one annular member in a radial direction, A spacer which is inserted between opposed end faces of the track member and corresponds to a cutout portion of the annular member is annularly assembled.

Further, the spacer is provided with a hole extending in the axial direction and having an opening on both sides in the circumferential direction, and a fitting member having engagement portions projecting from the opening on both sides in the circumferential direction is fitted in the hole,
An engagement recess is provided on the end surface of the track member so as to be able to engage with the engagement portion.

Further, in the method for manufacturing a swivel bearing according to the present invention, a plurality of arc-shaped track members are formed by cutting one annular member in a radial direction, and then the annular member is provided between opposed end faces of the plurality of track members. In cutting, a spacer corresponding to the cut-out portion is inserted and assembled integrally in a ring shape, and then the above-mentioned track member and spacer in the assembled state are subjected to a perfect circle processing.

<Operation> The plurality of arc-shaped orbit members are formed by cutting the circular member having a perfect circular shape including a later machining allowance in the radial direction. Further, the spacer is formed so as to correspond to a cutout portion when the annular member is cut in the radial direction.
Then, the raceway ring before the perfect circular processing is assembled integrally in a ring shape by densely inserting the spacer between the raceway members, that is, between the end faces of the raceway member facing each other. Then, the required surface of the above-mentioned raceway ring in the state of being integrally assembled is subjected to a round processing by turning or grinding to finish the raceway ring. At this time, since the bearing ring is assembled into an annular shape by inserting the spacer corresponding to the notched portion during cutting between the orbital rings, the orbital ring assembled in the annular shape is a perfect circle as in the related art. It does not deviate from the above, and becomes a perfect circle shape equal to the above-mentioned annular member before cutting. Therefore, the above-mentioned round processing does not become uneven thickness processing as in the related art. For this reason, the bearing ring can be easily and accurately finished to a desired shape. When the induction hardening is performed before the cutting, a quenched layer having a uniform depth under the processing surface is secured, and the durability of the raceway surface and the like is maintained.

The spacer is provided with a hole extending in the axial direction and having an opening on both sides in the circumferential direction. A fitting member having engagement portions projecting from the opening on both sides in the circumferential direction is fitted into this hole. And, at the time of the above-mentioned annular assembly before the round processing, the engaging portions projecting from the above-mentioned opening on both sides in the circumferential direction of the spacer,
Engagement grooves provided on the end face of the track member and engageable with the engagement portion are aligned and engaged. By this engagement, the plurality of arc-shaped track members and the number of the spacers equal to the number of the track members are easily and accurately positioned with respect to each other, and are prevented from being shifted from each other during processing. For this reason, the round processing is easily and accurately performed. And the race member and the spacer of the completed race are easily and accurately positioned with respect to each other by the engagement of the engagement portion and the engagement groove of the fitting member on both sides in the circumferential direction of the spacer, and the complete circular shape is obtained. Assembled. Then, the processed surfaces are matched so that they always form a continuous circle that is continuously accurate and smoothly.

<Example> Hereinafter, the present invention will be described in detail with reference to an illustrated example.

FIG. 1 is a view of a first embodiment of a bearing ring of a swivel bearing according to the present invention viewed from the axial direction. The bearing ring has a substantially semi-arc shape that forms a part of a perfect circle, and has an external gear on the outer periphery. 1c, and an external gear 2c, which is a substantially semicircular arc forming a part of the same perfect circle as the one track member 1, and forms one gear with the external gear 1c on the outer periphery. Other track member 2 having
And the end faces 1a, 1b of the one raceway member 1 and the end faces 2a, 2b of the other raceway member 2 are disposed between opposed end faces 1a, 2a and between the end faces 1b, 2b, respectively. , 2 together with the plate-like spacers 3, 4 forming the above-mentioned perfect circle, and the spacers 3, 4 and the track members 1, 2 located on both sides of the spacers 3, 4 are fitted so as to extend over the three members. 4 in parallel 2 pieces each
The book consists of cylindrical pins 5,5 and 6,6. And it is assembled in an annular shape as shown in the figure (details will be described later). The bearing ring forms an outer ring of the swivel bearing together with two connecting rings described later.

Each of the track members 1 and 2 has two substantially semicircular arc shapes obtained by cutting one annular member along a plane having a diameter in a fixed cutting margin (see w in the figure). Each end face above
1a, 1b, 2a, 2b are formed by planes parallel to the axis. Here, the end surfaces 1a, 2a and the end surfaces 1b, 2b facing each other have the same shape (see FIG. 2), and the end surfaces 1a, 2a and the end surfaces 1b, 2b have shapes symmetric to each other. . The track members 1 and 2 are fitted at predetermined positions in the radial direction of the end surfaces 1a, 1b, 2a and 2b with a part of the pin 5 and a part of the pin 6, and the inner surface is formed as a cylindrical surface. And axial engagement grooves 7 and 8 (see FIG. 2). And the above pin
An axial circular hole 9 and a circular hole 10 are provided at circumferential positions that are 90 ° out of phase with 5 and 6. Both of these track members 1 and 2 have a radial cross-sectional shape shown in FIG. 3 except for the external gears 1c and 2c. And these track members 1,
2 has semi-arc-shaped grooves 11 and 12 each having a substantially rectangular cross section and open at one end at the one end and the other end, respectively, at one end and the other end in the axial direction of the inner peripheral surface. Due to the surfaces 11a and 12a perpendicular to the axes of the grooves 11 and 12, the two raceway rollers 13 and 14 roll on one raceway surface 15 and the other raceway surface 16 (see FIG. 1). A part is formed, and the inner peripheral surface 17 forms a large part of the raceway surface 19 on which the radial rollers 18 roll. A hardened layer (not shown) is formed on the surfaces 11a, 12a and 17 from the surface to a certain depth. Incidentally, reference numerals 20 and 21 denote fitting grooves having a substantially semi-arc shape having a rectangular cross section, and these fitting grooves 20 and 21 are used for assembling the bearing ring, respectively, as shown by imaginary lines a and b in FIG. Substantially rectangular semi-circular connecting members 22, 23
However, through the fitting portion, the fitting is performed over the two track members 1 and 2 in a state where the phase around the axis is shifted by 90 degrees with respect to the track member as in the conventional case (see FIG. 11). Are combined.

On the other hand, the two spacers 3, 4 have the same shape here, and as shown in FIG. 4, they face the end faces 1a, 2a or 2a, 2b (2a, 2b) of the two track members 1, 2 facing each other. Second
Parallel end faces 3a, 3b or 4a,
4b, and has a substantially plate shape having a thickness equal to the cutting margin w as shown in FIG. As shown in FIG. 1, the one spacer 3 has both end faces 3a, 3a completely coincident with the end faces 1a, 2a, and the other spacer 4 has both end faces 4a, 4a. The end faces 1b, 2b are inserted between the track members 1, 2 in a state where they are completely aligned. In the state of FIG. 1, one surface 3b, 4b of the spacers 3, 4 forms one track surface 15 together with the surfaces 11a, 11a of the track members 1, 2, and the other surface 3c, 4c is the above surfaces 12a, 12 of the track members 1, 2.
The above-mentioned raceway surface 16 is formed together with a, and the inner peripheral surfaces 3d and 4d are raceway members.
The track surface 19 is formed together with the inner peripheral surfaces 17, 17 of 1, 2. Similarly, the fitting grooves 3e, 4e of these spacers 3, 4
(See FIG. 5) is one annular fitting groove together with the fitting grooves 20 and 20 of the track members 1 and 2, and the fitting grooves 3f and 4f are one together with the fitting grooves 21 and 21. An annular fitting groove is formed.
In addition, as shown in FIG. 1, the external gears 1c and 2c are arranged such that the contact portions between the spacers 3 and 4 and the track members 1 and 2 are located at the tooth bottom and are not located on the tooth surface. Provided. For this reason,
The gear formed by the external gears 1c and 2c of the two track members 1 and 2 is selected so that the number of teeth is even.

As shown in FIGS. 4 and 5, the spacers 3 and 4 have openings at both end surfaces 3a and 3a or 4a and 4a at one end and the other end in the axial direction, respectively (see 24a and 25a in FIGS. 4 and 5). Axial holes 24 and holes
Has 25. The holes 24 and 25 are provided for the track members 1 and 2
While the spacers 3 and 4 are held in the annular state shown in FIG. 1, they are integrally formed with the engaging grooves 7, 7 and 8, 8 provided in the end faces 1a, 2a or 1b, 2b facing each other. It is provided by performing a circular hole machining in the axial direction. For details, see hole 24 above.
The engagement groove 7 on the one track member 1 side and the engagement groove 7 on the other track member 2 side are in the annular state shown in FIG.
Alternatively, the spacers 3 and 4 may be extended to a certain depth in the axial direction with a center at a substantially central position in the thickness w direction and a predetermined position in the radial direction.
4 is provided by integral processing by drilling a hole having a diameter larger than the thickness w. The hole 25, the engagement groove 8 on one track member 1 side, and the engagement groove 8 on the other track member 2 side are provided in the same manner.

As shown in FIG. 1, one circular hole 28 formed by two engagement grooves 7, 7 and the hole 24 of the spacer 3 at one end in the axial direction, and the other circular hole 28 formed in the same manner on the spacer 4 side. The pins 5 are closely fitted to the circular holes 29, respectively. Similarly, one circular hole 30 formed by the two engaging grooves 8, 8 and the hole 24 of the spacer 3 on the other axial side and the other circular hole 31 formed in the same manner as described above. The pins 6 are fitted respectively. The protruding portions 5a, 5a or 6a, 6a (see FIG. 5) of the pins 5, 6 projecting from the openings 24a, 24a and the openings 25a, 25a and fitting into the engagement grooves 7 or 8 (see FIG. 5). Act as Then, the two track members 1, 2
1 is formed by engagement of the engaging grooves 7, 8 on both sides in the circumferential direction of the spacers 3, 4 with the protruding portions 5a, 6a of the pin 5 protruding from the end faces 3a and 4a of the spacers 3, 4. Are positioned relative to each other in the directions indicated by. In the circumferential direction, the end faces 3a, 3a of the spacer 3 and the opposed end faces of the track members 1, 2
Positioning is performed by contact with the end faces 1a and 2a and by contact between the end faces 4a and 4a of the spacer 4 and the end faces 1b and 2b of the track members 1 and 2.

The pin 5 is provided longer than the depth of the engaging groove 7 and the hole 24 by an appropriate dimension, and the pin 6 is also provided longer than the depth of the engaging groove 8 and the hole 25 by an appropriate dimension. ing. Then, they protrude in the axial direction from the circular holes 28, 29, 30, 31 respectively. Also, the pins 5, 6 are fitted into the holes 9, 10 which are 90 ° out of phase with the pins of the track members 1, 2, respectively, with a part thereof protruding (see FIG. 6; however, FIG. In the drawing, the other end in the axial direction is omitted because it is the same as the one end in the drawing).

The ring-shaped connecting ring 42 having the semi-circular connecting members 22 and 22 and the two spacers 40 and 41 is provided on the raceway ring in a state where the pins 5 and 6 are respectively protruded from the ring-shaped ring. As shown in FIG. 7, push the bearings out of contact with each other in a state shifted in phase by 90 ° from the bearing ring as shown by arrows, and fit them into the circular holes 28 and 29 of the spacers 3 and 4 as shown in FIG. Pin 5,5 combined
Are fitted in holes 22a, 22a provided in the center of the arcs of the connecting members 22, 22, respectively, while the pins 5, 5 fitted in the holes 9, 9 are formed in the spacers 40, 41 of the connecting ring. Are fitted in the circular holes 43 and 44. Then, the connecting ring 42 is positioned with respect to the raceway ring, and the connecting ring 42 and the raceway ring are axially connected by a plurality of bolts (not shown) at appropriate positions in the circumferential direction. The wheels are assembled together. (The other end side, that is, the connecting ring provided with the connecting member 23 shown in FIG. 3 is the same as that described above, and is not shown.)

The track members 1 and 2 and the spacers 3 and 4 having the above configuration are made as follows. That is, first, a true circular annular member having a cross-sectional shape obtained by adding a necessary processing allowance to a target cross-sectional shape (see FIG. 2) is manufactured by, for example, forging. Then, the annular member is subjected to induction hardening to form a hardened layer extending from the surface to a certain depth. Next, this annular member is cut into two pieces along a single plane in the diameter direction at a fixed cutting margin (see w in FIG. 1). Then, two substantially semicircular members obtained by this cutting, that is, both end surfaces 1a, 1b, 2a, 2b of the two track members 1, 2 are finished to a plane parallel to the axis of the annular member. On the other hand, separately from the annular member, the annular member has a thickness obtained by adding a machining allowance to the cutting margin w, has substantially the same cross-sectional shape as the annular member, and has the end faces 1a, 2
Two plate-like members having both end face shapes substantially equal to a and 1b, 2b are manufactured. Then, the two plate-shaped members, that is, the surfaces of the spacers 3 and 4 corresponding to the surfaces on which the quenching layers of the annular members are formed are similarly subjected to induction hardening, and then the two spacers 3 and 4 are respectively attached to the above-described spacers. Finish by grinding or the like to a thickness equal to the cutting allowance w. Next, the two spacers 3 and 4 and the two track members 1 and 2 are assembled in an annular shape with their end faces aligned. Then, they are integrally held by a jig or the like. At this time, the two track members 1, 2
However, since the spacers 1 and 2 corresponding to the portions cut out by the cutting can be assembled closely in the circumferential direction, the assembled one does not become elliptical as in the past, and Of the above-mentioned annular member.
For this reason, in the subsequent turning and grinding, the turning and grinding do not become uneven thickness processing as in the related art. Next, as described above, the spacers 3 and 4 and the two race members 1 and 2 are subjected to axial circular processing by integral processing to form the holes 24 and 25 in the spacer, and the races 1 and 2 are provided with the above-described engagement rings. Mating grooves 7, 7 and 8, 8 are provided (same on the opposite side in the diametric direction). And
The pins 5, 5, and 6, 6 having the same diameter are fitted in the circular holes 28, 29, 30, 31 formed thereby. This allows
The track members 1 and 2 and spacers 3 and 4
Are prevented from shifting from each other in the radial direction. Next, the circularly held member is subjected to a perfect circular process, that is, turning or grinding, thereby finishing the three track surfaces 15, 16, 19, etc., and further performing a gear cutting process on the outer peripheral surface. Then, the member held in an annular shape is finished in a perfect circular shape having the final sectional shape shown in FIG. 3 and having a gear on the outer periphery. However, the gear cutting is performed such that the four contact surfaces of the spacers 3 and 4 and the track members 1 and 2 do not touch the tooth surfaces. In this way, the race shown in FIG. 1 is produced. Since the turning and the grinding do not become uneven thickness processing, the race is easily and accurately formed. And the above track surfaces 15, 16, 19
A quenched layer having a uniform thickness is left below. In manufacturing the race, there is no need to sharpen the conventional elliptical member as in the case of cutting the thickness of the elliptical member into a perfect circle. Therefore,
To obtain a track member of the same size, it can be made from an annular member smaller than before.

The connecting ring 42 is manufactured in the same manner as the raceway ring. Then, the phase of the bearing ring and the connecting ring 42 are mutually shifted as shown in FIG.
Connect the connecting ring 42 with the connecting ring 42
The hole 22a of 22 is formed integrally with the engaging grooves 7, 7 of the track members 1, 2 and the hole 24 of the spacer 3 (the same applies to the spacer 4 side). The engaging grooves 22b, 22b of the connecting members 22, 22 and the hole 40a of the spacer 40 are integrally formed with the hole 9 of the track member 1 (the same applies to the connecting ring on the other end).

The drive wheels are assembled on a surface plate or the like as follows, for example. That is, first, one of the track members 1
The pins 5, 5 projecting from the circumferentially one openings 24a, 24a (see FIG. 5) of the spacers 3, 4 in a state where the pins 5, 5 are closely fitted to the engagement grooves 7, 7 respectively. The projecting portions 5a, 5a are fitted to each other, so that two spacers
Position 3 and 4 circumferentially and radially. Next, the other opening 2 in the circumferential direction of the spacers 3 and 4 at this position is determined.
4a, 24a projecting parts 5a, 5a to the other track member 2
And the other track member 2 is positioned with respect to the spacers 3 and 4. Thereby, as shown in FIG. 1, both end faces 3a, 3a of the spacer 3 and the end faces 1
a, 2a, and both end faces 4a, 4a of the spacer 4 and the track member.
The end faces 1b and 2b of the first and second 1 are completely matched. The same operation is performed on the pin 6 side in synchronization with the above-described procedure on the pin 5 side. As a result, the three raceway surfaces 15, 16, 19 and the gear are accurately formed without shifting at the contact portions between the spacers 3, 4 and the raceway members 1, 2. In this way, the race can be easily and accurately assembled in a perfect circle. After the pins 5 and 6 are closely fitted into the holes 9, 9 and 10, 10 of the bearing rings 1 and 2, respectively, the assembled bearing rings are shifted in phase by 90 ° in one axial direction. The connecting ring 42 and the other connecting ring in the axial direction are integrally fixed so as to be disassembled (see FIGS. 3 and 7). Since the spacers 3 and 4 are firmly supported by the track members 1 and 2 via the pins 5 and 6, respectively, thrust loads and radial loads act on the spacers 3 and 4 through the thrust rollers 13 and 14 and the radial rollers 18. Even if it does not tilt with respect to the axis of the bearing ring, or shift in the axial or radial direction.

Thus, the race can be manufactured easily and accurately. Then, when induction hardening is performed before cutting, a hardened layer having a uniform thickness can be left below the raceway surface or the like.

Further, according to this bearing ring, the end faces of the bearing members 1, 2 and the spacers 3, 4 can be easily and accurately matched with each other at the time of assembling, and can be accurately assembled into a perfect circle. Therefore, the track surfaces 15, 16, 19, etc., can be formed on one accurate plane or cylindrical surface. Moreover, even if disassembled for repair or the like, it is possible to easily and accurately reassemble. Therefore, the swivel seat bearing to which this bearing ring is applied can be easily disassembled into small parts as usual,
Moreover, assembling can be performed more easily and accurately than in the past.

FIG. 8 is a view of a main part of a second embodiment of a bearing ring of a swivel bearing according to the present invention as viewed from the axial direction. Reference numerals 41 and 42 denote radial cross-sectional shapes indicated by imaginary lines c in FIG. Reference numeral 43 denotes a spacer (see FIG. 9), and reference numeral 45 denotes a pin. And these are the spacers 43 between the end faces 41a and 42a.
Are arranged in an annular shape like FIG.
And, as shown in FIG.
The raceway surface 46 of the raceway ring of the first embodiment is opposed to the raceway surface 16 of the raceway ring of the first embodiment while keeping a constant gap in the axial direction, and the thrust roller 14 rolls. Face 19
With a certain distance in the radial direction and radial rollers 18
And a raceway surface 48 in the axial direction on which the ball rolls.

The track members 41 and 42 and the two spacers 43 are made in the same manner as the track members 1 and 2 and the spacers 3 and 4 of the first embodiment. Engaging grooves 47, 47 extending in the axial direction are formed in the track members 41, 42, respectively, and axial holes 4 (see 49a in FIG. 9) are formed in the spacer 43 on both sides in the circumferential direction.
9 is formed by integral processing (the same applies to the diametrically opposite side not shown). The pin 45 is fitted in a circular hole 50 formed by the engaging groove 47 of one track member 41, the engaging groove 47 of the other track member 42, and the hole 49 of the spacer 43. Thereby, the two track members 41 and 42 and the two spacers 43 are respectively protruded from the openings 49a on both sides in the circumferential direction of the pin 45 through the protruding portions 45a and 45a, respectively.
Positioned relative to each other and each end face is exactly coincident.

The one end face in the axial direction of the track members 41 and 42 and the spacer 43 has a rectangular shape extending in a substantially right angle direction and has a constant depth in the axial direction (see d in FIG. 9) so as to straddle the three members. A concave portion 51 is provided (the same is applied to the opposite side in the diameter direction), and the center of the concave portion 51 substantially coincides with the center of the circular hole 50. The width W in the radial direction is larger than the circular hole 50, that is, the diameter 45 of the pin. The end surface of the pin 45 substantially matches the bottom surface 51a of the concave portion 51 when fitted into the circular hole 50 (see FIG. 9). Track member forming a part of the concave portion 51
At the approximate center of the recesses 41a and 42a of the 41 and 42, respectively, screw holes 5 in the axial direction are provided.
2, 52 are provided, and a connecting plate (not shown) having a substantially rectangular shape capable of being fitted into the concave portion 51 and having a thickness substantially equal to the depth d is fitted into the concave portion 51. By screwing into the screw hole 52 on one track member 41 and screwing the other end of the connecting plate into the screw hole 52 on the other track member 42, the two track members 41 and 42 are , Spacer 43
Are pinched in the circumferential direction as shown in the figure, and the pins 45 are fitted in the circular holes 49, respectively. Then, the pin 45 is prevented from coming off by the connecting plate. A recess 53 having two screw holes similar to the above-described recess is provided on the other end face on the opposite side in the axial direction of the raceway so as to straddle the raceway member and the spacer. By screwing the connecting plate to
The connection can also be made on the other end face side in the axial direction. The functions and effects other than the connection part by the connection plate are the same as those of the first embodiment.

Note that this raceway and the raceway indicated by the imaginary line e in FIG. 3 constitute an inner race of the swivel bearing, and these are in phase with each other.
Assembled together with bolts etc. while being shifted by 90 ° (see FIGS. 6 and 7).

In the above embodiment, two spacers 3 and 4 or spacers 4 are provided, one at each of two circumferential positions symmetrical to the axis of the bearing ring.
3 and 43 are provided, and the track members 1 and 2 or the track members 41 and 42 are formed in a semicircular arc shape as if one annular member was cut at two circumferential positions symmetrical with respect to the axis. However, the circumferential positions at which the spacers are provided are not limited to the above-described circumferential positions, and the number of spacers provided is not limited to two. The circumferential positions at which these spacers are provided and the number of spacers are determined by the capacity of the transportation vehicle. In consideration of the workability, the size and weight of the entire bearing ring, etc., it is appropriately determined, for example, three every 120 °. And the track member,
It is configured such that one annular member is cut in accordance with the circumferential position where the spacer is provided and the number of spacers provided. In addition, this can be said of a connecting wheel.

In the above embodiment, a pin having a diameter larger than the thickness of the spacer is used as the fitting member. A shape like the side including the axis of the two types of solids obtained by cutting the cylinder having the same diameter as the pin into two virtual planes parallel to the axis and parallel to each other at the same distance from the axis. In the end face of the track member, a cylindrical lens-like engagement groove such as the other of the two types of solids is provided,
The pin is fitted into a circular hole formed by the hole and the two engaging grooves, and the engaging portion is constituted by a part of the pin protruding to both sides in the circumferential direction from the opening on both sides of the spacer. ,
It goes without saying that the shapes of the fitting member and its engaging portion, hole and engaging groove are not limited to these.

<Effects of the Invention> As is apparent from the above description, the orbital ring of the swivel bearing according to the present invention includes a plurality of arc-shaped orbital members formed by cutting one annular member in the radial direction, Inserted between the opposed end faces, the annular member and the spacer corresponding to the cut-out portion are assembled in an annular shape, so that its manufacture does not require a relentless technique such as elliptical forging, and Round processing such as turning and grinding performed by assembling does not become uneven thickness processing as in the past. Therefore, according to the present invention, it is possible to easily and accurately manufacture a raceway into a perfect circle. In addition, when heat treatment is performed before cutting, the heat treatment layer can be left uniformly below the processing surface. In addition, since it is not necessary to sharpen the thickness as in the conventional uneven thickness processing, the annular member can be made smaller than the conventional one.

In the bearing ring of the swivel bearing according to the present invention, the spacer is provided with holes extending in the axial direction and having openings on both sides in the circumferential direction, while the holes have engaging portions projecting from the openings on both sides in the circumferential direction. The fitting member is fitted, and furthermore, the end face of the track member is provided with an engagement groove capable of engaging with the engaging portion. Positioning with respect to each other can be easily and accurately performed via the members. Therefore, according to the present invention, it is possible to easily and accurately assemble the bearing ring into a perfect circle with good reproducibility. Also, it can be easily disassembled. Further, by providing the above-described configuration prior to the round processing, it is possible to prevent deviation between the members during the round processing, and to easily and accurately process into a perfect circle.

Further, according to the method of manufacturing a bearing ring of a swivel bearing according to the present invention, a perfect circular bearing ring can be easily and accurately manufactured. And it does not require a special description such as elliptical forging.

[Brief description of the drawings]

FIG. 1 is a side view of a first embodiment of a bearing ring of a swivel bearing according to the present invention, FIG. 2 is a perspective view of an end of a track member of FIG. 1, and FIG. 3 is FIG. Sectional view of the raceway member in the radial direction,
FIG. 4 is a view of the spacer of FIG. 1 viewed from the circumferential direction, FIG. 5 is a view in the direction of arrow V in FIG. 4, FIGS. 6 and 7 are schematic explanatory views of the assembling, and FIG. Of the bearing ring of the bearing
FIG. 9 is a view of a main part of the embodiment viewed from an axial direction, FIG. 9 is a view of a spacer of FIG. 8 viewed from a circumferential direction, and FIG. 10 is a shaft of a swivel seat bearing to which a bearing ring of a conventional swivel seat bearing is applied. Sectional view in the direction of the first
FIGS. 1 and 12 are explanatory diagrams of the inner ring and the outer ring of FIG. 10, and FIGS.
5, 16 and 17 are explanatory views of a conventional method for machining a raceway of a swivel bearing, and FIG. 17 is an explanatory view of positioning. 1,2,41,42 ... Track member, 1a, 1b, 2a, 2b, 41a, 42a ... End face, 3,4,43 ... Spacer, 5,6,45 ... Pin, 5a, 6a, 45a ... Projecting parts, 7, 8, 47 ... Engagement grooves, 24, 25, 49 ... Holes, 24a, 25a, 49a ... Openings.

Claims (3)

(57) [Claims] 1. A plurality of arc-shaped track members formed by cutting one annular member in a radial direction, and a plurality of arc-shaped track members inserted between opposed end faces of the track member, and the annular member is cut at a cutout portion. A bearing ring of a swivel bearing made by assembling corresponding spacers in a ring. 2. The bearing ring according to claim 1, wherein the spacer is provided with holes extending in the axial direction and having openings on both sides in the circumferential direction. The holes are provided on both sides in the circumferential direction. A bearing ring for a swivel bearing having a fitting member having an engaging portion protruding from the opening fitted therein, and an engaging recess engageable with the engaging portion provided on the end face of the track member. 3. A plurality of arc-shaped track members are formed by cutting one annular member in a radial direction, and a portion cut out between opposing end surfaces of the plurality of track members when the annular member is cut. A method of manufacturing a raceway ring for a swivel bearing, characterized in that a spacer corresponding to (1) is inserted into the ring member and the ring member is assembled integrally in a ring shape, and then the above-mentioned raceway member and spacer in the assembled state are subjected to perfect circular processing.