JP2011144919A - Bearing device for wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ring-like forging material for an outer ring in a bearing incorporated to a hub unit, which has a shape reduced in weight without embrittling the ring-like forging material by means of forging capable of axially shaping the outer ring of the bearing instead of CRF (cold rolling forming). <P>SOLUTION: An outer race forging material 1 for a ring-like bearing having a race 3 for rolling a rolling element composed of a ball or roller on an inner periphery 1a is produced by making a ring from a steel bar material or steel pipe and subjecting the ring, after the surface thereof is shot-blasted, to lubricating treatment and cold forging. The outer race forging material 1 is reduced in weight so as to be incorporated to a hub unit by contracting one or both of a recessed groove 4 of an outer periphery 1a and a recessed cutout 5a of a ring end portion 5 while maintaining the shape of the ring inner periphery 1b. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The invention of the present application is to manufacture a ring by hot forging from a steel bar, and further cut this ring to an appropriate length, turn the surface of the cut ring, then shot blast, and further lubricate, Bearing outer ring profile incorporated as a unit in a first generation hub outer ring in an automobile manufactured by cold forging, especially the outer ring profile of a bearing incorporated in a first generation hub with a reduced weight Regarding materials.

  In general, the performance required for automobiles includes (1) driving performance such as power performance, braking performance and steering performance, (2) comfort such as ride comfort and in-house noise, and (3) maintenance. Economics such as easy and low fuel consumption, (4) styling that harmonizes function and beauty, product characteristics with indoor design and hobby elements, (5) measures to prevent accidents, Safety that minimizes damage to accidents and prevents damage from spreading after accidents, and (6) Low pollution that does not emit carbon dioxide and hazardous waste. Among these required performances, in order to achieve the above-mentioned driving performance, such as power performance, braking performance, steering performance, etc., economy that consumes less fuel, and low pollution that does not emit carbon dioxide and hazardous waste Therefore, there is a need for a structure of an outer ring member of a bearing incorporated in a first generation hub in a drive mechanism of a vehicle body of an automobile or a method for manufacturing the same while reducing the cost as much as possible without degrading these performances. Yes.

  By the way, the outer ring of the bearing incorporated in the first generation hub in the driving mechanism of the body of a conventional automobile is mainly a steel bar made into a ring by hot forging, this ring is annealed, and the surface of the annealed ring is shot blasted. After that, it was manufactured by a cold rolling process (hereinafter referred to as “CRF”). In the manufacturing process described above, the process of rotating at the final stage, that is, the processing by CRF, is performed. Therefore, the ring-shaped outer surface in the axial direction of the outer ring of the bearing as a product can be shaped in the circumferential direction by CRF. However, the axial shape could not be achieved.

  2. Description of the Related Art In the technical field of conventional automobiles, an outer member that is fixed to a car body of an automobile, an inner member that is attached to the car body, a rolling member that is disposed between the outer member and the inner member, and a cage are provided. There is known a wheel bearing unit having a structure in which an outer member is rotatably supported via a rolling member. In this wheel bearing unit for an automobile, a recessed member that is attached to the end of the inner member and has a recessed portion formed in the outer end, and a signal that is provided on the inner peripheral surface of the recessed member and that corresponds to the number of revolutions. An encoder part, a sealing member fixed to the outer member and covering the recess part, and being positioned in the recess part and fixed to the sealing member so as to face the encoder part in the radial direction. An automobile wheel bearing unit including a rotation detector that detects a signal generated from the encoder unit is disclosed (for example, see Patent Document 1). However, this eliminates the possibility of earth and sand or muddy water entering from the outside during operation to the place where the rotation detector and encoder section exist, and enables accurate rotation speed detection over a long period of time. The encoder part is attached by attaching a shape.

  Furthermore, in another technical field of automobiles, in the manufacture of a wheel bearing device that rotatably supports wheels of automobiles or the like, pipe materials are cut to a required length, and burrs at both ends of the cut pipe materials are cut. The inner and outer diameter surfaces of the deburred pipe material are turned, and a mandrel with an outer peripheral surface is inserted into the inner diameter of the turned pipe material, and a recess is formed on the outer peripheral surface. The formed forming roll is arranged on the outer periphery of the pipe material, and a desired shape is formed on the inner peripheral surface of the pipe by rotating at least one of the forming roll and the mandrel with the pipe material interposed therebetween, for example, CRF (for example, (See Patent Document 2). This is easy to finish in the subsequent process by adding a shape to the outer diameter of the pipe. However, in this technique, when a product is cut by a cross section passing through the center of a circle and perpendicular to the axial direction, only a product having the same cross-sectional shape can be obtained by CRF.

JP-A-1-254401 JP 2008-138860 A

  The problem to be solved by the present invention is that, in a bearing incorporated in a hub, a shape is given in the axial direction of the bearing outer ring in place of the CRF, which could not be given a shape in the axial direction of the outer ring of the bearing. An object of the present invention is to provide a ring-shaped member of an outer ring in a bearing that is shaped in a shape that does not weaken the ring-shaped member of the outer ring of the bearing.

  The means of the present invention for solving the above problems is a ring formed by cutting from a steel bar material by hot forging or a cutting ring having an appropriate length by cutting a steel pipe, and this ring is a cutting ring by cutting. A ring-shaped outer ring shape material of a bearing which is manufactured by cold forging after being shot blasted, and which is manufactured by cold forging, especially in a bearing incorporated in an automobile hub. This is the structure.

  That is, the invention of claim 1 is a ring-shaped outer ring for bearings (hereinafter, the outer ring is referred to as “outer race”) having a race ring on the inner peripheral surface for rolling rolling elements made of balls or rollers. It is in. A hub unit comprising an outer race shape material in which one or both of the outer peripheral surface and the ring end portion is reduced while maintaining the shape of the ring inner peripheral surface of the outer race shape material. It is an outer lace base material that has been reduced in weight for incorporation into the body.

  According to the invention of claim 2, the shape of the outer lace shaped member with the outer peripheral surface reduced while maintaining the shape of the ring inner peripheral surface of the outer lace shaped member is a slit in the axial direction of the ring on the outer peripheral surface of the outer lace shaped member. An outer race shaped material having a shape in which the thickness of the concave groove portion is made thinner than the thickness of the thickness other than the concave groove portion by arranging the concave grooves at equal intervals. 1. The outer race shaped material having a reduced weight as described in 1.

  In the invention of claim 3, the shape of the outer race shaped member with the ring inner peripheral surface maintained in a maintained state is reduced in the shape of a concave cut in the axial direction of the ring at the ring end of the outer race shaped member. It is characterized by comprising an outer race shape material having a shape formed in a range that does not reach the raceway ring having the depth of the concave notch on the inner surface of the outer race by arranging the notches at equal intervals. The lightened outer race shape material according to claim 1.

  The present application relates to an outer lace base material having a shape in which only the outer peripheral surface is reduced while maintaining the shape of the inner peripheral surface of the ring of the outer lace base material of the means of the invention of claim 1 above, The bearing raceway is formed by a concave groove formed on the outer peripheral surface in the axial direction of the outer race shaped member of the invention and a concave notch formed at the ring end of the outer race shaped member of the means of the invention of claim 3. Without affecting the rolling state of the rolling elements of the wheel, it is possible to obtain a lightweight outer race by incorporating it into a hub unit formed from these outer race materials. By using the unit, it is possible to improve the fuel cost and reduce the amount of exhaust gas that is the source of pollution for gasoline cars, or reduce the consumption of electricity for electric cars. Can to help aid in weight reduction of automobiles by the.

(A) is the outer lace shape material which formed the ditch | groove in this invention, (b) is a figure which shows the magnitude | size of the ditch | groove in the outer lace shape material shown to (a). It is a typical flowchart for forming the ring-shaped material of the present invention from a SUJ2 steel pipe. (A) is a SUJ2 steel pipe 16, (b) is a cutting ring 17, (c) is a cutting ring 18, and (d) is a ring-shaped material. 19. It is a schematic diagram which shows the ring-shaped raw material of (a) which consists of the steel bar of the other Example of this invention, and the bar material of (b) formed from this ring-shaped raw material. FIG. 4 shows a flow chart formed from the bar material of FIG. 3 to the upset body of (a), the cup body of (b), and the forming ring of (c). It is a figure which shows typically 2nd Embodiment which is invention which concerns on Claim 2 of this application, (a) shows before cold forging, (b) shows the state after pressure molding. It is a figure which shows typically the shaping | molding process of the invention which concerns on Claim 2 of this invention, (a) is a ring-shaped raw material which is a cutting ring, (b) is a ring-shaped raw material in a ring-shaped die, (c) is an outer (D) is a plan view of the ring-shaped die, (e) is a cross-sectional view of the outer lace shape, and (f) is an outer lace shape having a concave notch at the ring end. Side surface sectional drawing of a material, (g) is a top view of (f), (e) is a schematic diagram which each shows a perspective view. It is a figure which shows typically 3rd Embodiment which is invention which concerns on Claim 3 of this application, (a) shows before cold forging, (b) shows the state after pressure molding. BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the cold forging apparatus for implementing invention of this application, (a) shows the stage before the press which mounted the ring-shaped raw material to the lower punch, (b) is a ring-shaped raw material with an upper punch. It is a side view which shows the state pressurized and shape | molded in the outer race shape material. It is a figure which shows each magnitude | size of the outer race shape material which can be used for this invention. It is a figure which shows the 1st generation hub unit incorporating the bearing formed from the outer race shape material of this invention.

  Embodiments for carrying out the invention of the present application will be described below with reference to the drawings. In the first embodiment, there is an outer race shape material 1 for a ring-shaped bearing having a raceway 3 for rolling a rolling element 2 composed of balls 2a or rollers 2b on an inner peripheral surface 1b. An outer race 21 to be incorporated into the first generation hub unit 20 shown in FIG. 10 is formed from the base material 1. The outer race 21 is an outer race 21 that is lightened for incorporation into the hub unit 20. In the means of the first embodiment, the shape of the ring inner peripheral surface 1b having the race 3 of the outer race shaped material 1 is not changed, and the outer peripheral surface 1a is maintained while maintaining the shape. One or both of the outer peripheral surface 1a and the ring end 5 having only the above shape are formed in a reduced shape. By reducing only the shape of the outer peripheral surface 1a, the weight of the outer lace base material 1 is reduced by the reduced amount.

  In the second embodiment, the shape of the ring inner peripheral surface 1b of the outer lace base material 1 is a shape obtained by reducing only the outer peripheral surface 1a while maintaining the same shape without changing. This is in the first embodiment. As shown in FIG. 1 (a), the outer race 1 has an outer diameter dimension of, for example, φ85.3 mm and an inner diameter of 73.5 mm. 6 concave grooves 4 are arranged at equal intervals. The outer race element having a shape in which the thickness between the outer peripheral surface 1a and the inner peripheral surface 1b of the portion of the concave groove 4 is formed thinner than the thickness between the outer peripheral surface 1a and the inner peripheral surface 1b other than the concave groove portion. It is formed from the material 1. Thus, by forming the thickness between the outer peripheral surface 1a and the inner peripheral surface 1b of the recessed groove 4 thin, the weight of the outer race shaped material 1 is reduced by the reduced thickness. . However, since the thickness between the outer peripheral surface 1a and the inner peripheral surface 1b remains as it is in the portion other than the concave groove portion on the outer peripheral surface, the strength of the outer race shaped member 1 is the required strength as a bearing. The groove width and the number of the recessed grooves 4 arranged at equal intervals so as to maintain the above are provided. In this case, as shown in FIG. 1 (b), between the two lines connected from the ring center point 1c in the axial direction of the ring to the outer race shaped member 1 at an angle of 20 °, the outer peripheral surface 1a For example, the groove 1 is formed in the groove 4 by being recessed by 1.5 mm into the surface 1b. As for the dimensions of the outer race shaped material 1, the outer diameter is φ85.3 mm as described above, and the inner diameter is φ73.5 mm.

  In the case in which six slit-shaped concave grooves 4 in the axial direction of the ring are arranged at equal intervals on the outer peripheral surface 1a of the outer race shaped material 1 of the second embodiment, 9. Since the weight is reduced by 0 g, the total weight of the 6 pieces can be reduced by 54.0 g, and the weight of the outer race shaped material 1 can be reduced by about 10%.

  In the third embodiment, as shown in FIG. 1 (c), the outer peripheral surface of the ring of the outer race shaped member 1 whose outer diameter is, for example, φ85.3 mm and inner diameter is 73.5 mm. The shape of 1a and the inner peripheral surface 1b is not changed, and the concave notch portions 5a are arranged at equal intervals in the circumferential portions at both ends of the ring end portion 5 while maintaining the shape as it is. is there. In this case, as shown in FIG. 1D, the concave notch 5a is formed in an arc having a depth of 2 mm and an R32 mm. In this case, as described above, the concave notch portions 5a are arranged at equal intervals on the circumferential portions at both ends of the ring end portion 5, and four each are provided at both ends. In these cases, since the concave notch 5a can be reduced in weight by 1.5 g per notch at the circumferential portion at both ends of the ring end 5, the concave notch 5a at the circumference of the ring end 5 is Since there are a total of 8 pieces at both ends, the weight can be reduced by 12.0 g in total, and about 2% of the weight of the outer race shaped material 1 can be reduced. In FIG. 1C, the slit-like concave groove 4 in the axial direction of the ring is omitted from the ring outer peripheral surface 1a.

Here, first, a second embodiment shown in FIG. 6C will be described. In describing the manufacturing method of the outer race shaped material 1 described above, first, a first method using the following conventional means will be described. In this method, a steel bar made of SUJ2 of JIS G 4805, which is a JIS standard high carbon chrome bearing steel material, is hot-rolled by an assel mill by hot rolling or hot extrusion, and is shown in FIG. 2 (a). A SUJ2 steel pipe 16 having an outer diameter φ86.2 mm and an inner diameter φ69.5 mm is obtained, and this is cut into a length 46.5 mm as shown in FIG.
Further, a second method using other means will be described. In the case of this second method, the steel material is also a steel bar. That is, a steel bar made of JIS G 4805 SUJ2 of JIS standard high carbon chrome bearing steel as a steel material is hot rolled to obtain a material 25 having a diameter of 46 mm in FIG. This material 25 is shear-cut to obtain a bar material 26 having a length of 73.2 mm as shown in FIG. Further, the bar material 26 is heated to 1150 ° C. and installed in the first step to form an upset 27 having a diameter of 85 mm and a thickness of 21.4 mm as shown in FIG. 4 to obtain a cup body 28 having an outer diameter of φ86.2 mm, an inner diameter of φ69.5 mm, a bottom thickness of 7 mm, and a length of 46.5 mm and a weight of 952 g. Further, in the third step, the bottom 28a of the cup body 28 is punched out by punching, and the weight of 744 g having an outer diameter φ86.2 mm, an inner diameter φ69.5 mm, and a length 46.5 mm shown in FIG. The forming ring 29 is used. The weight of the punched poncas was 208 g.
Further, the cutting ring 17 having an outer diameter of φ86.2 mm, an inner diameter of φ69.5 mm, and a length of 46.5 mm shown in FIG. A molding ring 29 having an outer diameter of φ86.2 mm, an inner diameter of φ69.5 mm, and a length of 46.5 mm shown in FIG. 2C is cut to obtain a length of 46.0 mm and an outer diameter of φ85.0 mm shown in FIG. The cutting ring 18 is a cold forged blank having an inner diameter of 70.5 mm. After these shot rings 18 are shot blasted, a lubrication process consisting of a one-liquid process is performed on the entire surface. Further, the lubricated cutting ring 18 is inserted into the ring die 14 and placed on the lower punch 13 as shown in FIG. Under pressure, cold forging shown in FIG. 7B is performed. As a result, it has a length of 46.7 mm, an outer diameter of φ85.3 mm, and an inner diameter of 73.5 mm, has a concave groove 4 in the axial direction, and a width of 12 mm that protrudes between these concave grooves 4 and 4 toward the axial center. A ring-shaped material 19 shown in FIG. 2 (d) having an inner peripheral surface convex portion 6 having an inner diameter of φ60 mm was obtained. These ring-shaped materials 19 have a ring-shaped material 11 having a length of 46.0 mm, an outer diameter of 85.0 mm, and an inner diameter of 70.5 mm shown in FIG. 6A (this ring-shaped material 11 is shown in FIG. 2C). Is inserted into a ring-shaped die 14 having a ridge 14a shown in the plan view of FIG. 6D on the inner peripheral surface, and the lower punch 13 and the upper punch of FIG. 12, the outer peripheral surface 1 a having a length of 46.7 mm, a diameter of φ85.3 mm, an inner peripheral surface of a diameter of φ73.5 mm, and an inner peripheral surface convex portion 6 having an inner diameter of φ60 mm shown in FIG. The ring-shaped material 19 having a ring shape, the ring-shaped material 19 is taken out by the ring-shaped knockout 15 of FIG. 7, and the outer race shape having the axially recessed groove 4 on the outer peripheral surface 1a shown in FIG. Material 1 is obtained. In addition, it is also possible by cutting to provide the axial concave groove 4 to the outer peripheral surface 1a.

Next, a third embodiment shown in (e), (f), and (g) of FIG. 6 will be described. As shown in FIG. 1A, the shapes of the outer peripheral surface 1a and the inner peripheral surface 1b of the ring of the outer race shaped member 1 having an outer diameter φ85.3 mm and an inner diameter φ73.5 mm, for example, are changed. 1 (c), and the concave notch portions 5a are arranged at equal intervals on the upper and lower circumferential portions of the ring end portion 5, while maintaining the shape maintained as it is. Is described as a method of the first means. In the method of the first means, first, a steel bar made of JIS G 4805 SUJ2 of JIS standard high carbon chrome bearing steel as a steel material is hot-rolled by an assel mill, or piped by hot-rolling or hot extrusion. 2A, a SUJ2 steel pipe 16 having an outer diameter of φ86.2 mm and an inner diameter of φ69.5 mm was obtained, and this was cut, and as shown in FIG. The cutting ring 17 is 5 mm.
Next, another means of the second method replaced with the method of the above means will be described. Also in the method of the second means, the steel material is also a steel bar. A steel bar made of SUJ2 of JIS G 4805, which is a JIS standard high carbon chromium bearing steel material, is used as a steel material to obtain a material 25 having a diameter of 46 mm in FIG. This material 25 is shear-cut to obtain a bar material 26 having a length of 73.2 mm as shown in FIG. Further, the bar material 26 is heated to 1150 ° C. and installed in the first step to form an upset 27 having a diameter of 85 mm and a thickness of 21.4 mm as shown in FIG. 4 to obtain a cup body 28 having an outer diameter of φ86.2 mm, an inner diameter of φ69.5 mm, a bottom thickness of 7 mm, and a length of 46.5 mm and a weight of 952 g. Further, in the third step, the bottom 28a of the cup body 28 is punched out by punching, and the weight of 744 g having an outer diameter φ86.2 mm, an inner diameter φ69.5 mm, and a length 46.5 mm shown in FIG. The forming ring 29 is used. The weight of the punched poncas was 208 g.
Further, a cutting ring 17 having an outer diameter of φ86.2 mm, an inner diameter of φ69.5 mm, and a length of 46.5 mm shown in FIG. 2B obtained by the method of the first means or the second means, or FIG. 4 (c), an outer diameter φ86.2 mm, an inner diameter φ69.5 mm, and a length of 46.5 mm, the formed ring 29 was cut, and the length 46.0 mm, outer diameter shown in FIG. A cold forging bran composed of a cutting ring 18 having a diameter of 85.0 mm and an inner diameter of 70.5 mm is used. After the cutting ring 18 is shot brass, the entire surface is lubricated by a one-liquid process. Further, the cutting ring 18 subjected to the lubricating process is formed on the ring-shaped die 14 as shown in FIG. A lower punch having a ring-shaped lower punch 13a having arc-shaped convex portions 13b that are equally spaced on the upper surface of the ring-shaped peripheral edge of the cutting ring 18 and an outer peripheral surface that can be inserted into the ring-shaped punch 13a. 7 is mounted by a ring-shaped upper punch 12a having an arcuate convex portion 12b on the lower surface and an upper punch 12 having an outer peripheral surface that can be inserted therein. As shown in b), cold forging is performed by simultaneously applying pressure from above and below these cutting rings.

  In the above method, the ring-shaped lower punch 13a having the arc-shaped convex portions 13b arranged at equal intervals on the ring-shaped peripheral portion on the lower surface of the cutting ring 18 and the ring-shaped peripheral portions on the upper surface of the cutting ring 18 are equally spaced. Each of the ring-shaped upper punches 12 a having the arc-shaped convex portion 12 b also serves as the ring-shaped knockout 15. As shown in FIG. 7 (a), a ring-shaped lower punch 13a and a lower punch 13a having arc-shaped convex portions 13b at equal intervals are inserted into the die 14, and the cutting ring 18 is further connected to these ring-shaped members. Cold forging is carried out by mounting on the lower punch 13a and the lower punch 13a and simultaneously pressurizing from above the cutting ring 18 with the ring-shaped upper punch 12a and the upper punch 12 having arcuate convex portions 12b at equal intervals. Thus, as shown in FIG. 1 (d), the concave notch 5a is formed in a circular arc having a depth of 2 mm and R32 mm, and has an outer diameter shown in FIG. 1 (c). An outer race shaped material 1 having a size of, for example, φ85.3 mm and an inner diameter of φ73.5 mm is obtained (in this case, the concave groove 4 formed in the outer peripheral surface 1a is omitted). As a result, the concave notch portions 5a are arranged at equal intervals on the circumferential portions at both ends of the ring end portion 5, and four each are provided at both ends. In addition, the concave notch 5a in the circumferential part at both ends of the ring end 5 can be provided by cutting. Furthermore, in the present invention, in addition to the concave notch portion 5a of the ring end portion 5, a shape in which the concave groove 4 is simultaneously added to the ring outer peripheral surface 1a may be used.

  FIG. 8 is a side view of the forging device used for the cold forging process of the present invention. FIG. 8A shows a stage before the ring-shaped material 11 is mounted on the lower punch 13 and the upper punch 12 is pressurized. In the figure, the upper punch 12 is positioned 180.8 mm above the ring-shaped material 11 and is waiting. 14 is a ring-shaped die, and 15 is an upper and lower ring-shaped knockout. FIG. 8B is a view showing a state in which the upper punch 12 is pressed down and pressed to form the ring-shaped material 11 into the outer race shape material 1. In these (a) and (b) of FIG. 8, the numerical value indicated by the arrow indicates the distance, and the unit is mm.

  FIG. 9 is a view showing each size of the outer lace shaped material 1 that can be used in the present invention. The outer lace shaped material 1 has an outer diameter of 50 to 110 mm, and the inner peripheral surface convex portion 6 has an inner diameter of 30 to 30 mm. 100 mm, the ring width can vary in the range of 20-60 mm. However, it is preferable that the magnitudes of the respective values fluctuate in the above range in an approximately proportional manner.

  FIG. 10 is a cross-sectional view of the first generation hub unit 20 in the driving portion of the vehicle body of an automobile having an outer race 21, an inner race 22, a ball 2a, and a bearing having a retainer 23 made of the outer race shape material 1 of the present application. FIG. In the figure, reference numeral 20a denotes a rotating shaft of the hub unit, and 24 denotes a center line of the hub unit. In this hub unit, by adopting a bearing having the outer race 21 according to the present invention, the hub unit as a whole has a reduced weight.

DESCRIPTION OF SYMBOLS 1 Outer race shape material 1a Outer peripheral surface 1b Inner peripheral surface 1c Ring center point 2 Rolling element 2a Ball 2b Roller 3 Race ring 4 Groove 5 Ring end 5a Concave notch 6 Inner peripheral surface convex 11 Ring-shaped material 12 upper punch 12a ring-shaped upper punch 12b arc-shaped convex portion 13 lower punch 13a ring-shaped lower punch 13b arc-shaped convex portion 14 ring-shaped die 14a ridge 15 ring-shaped knockout 16 SUJ2 steel pipe 17 cutting ring 18 cutting ring 19 ring Shaped material 20 Hub unit 20a Rotating shaft 21 Outer race 22 Inner race 23 Cage 24 Hub unit center line 25 Material 26 Bar material 27 Standing body 28 Cup body 28a Bottom (cup body)
29 molded rings

Claims (3)

  In the outer ring for a ring-shaped bearing (hereinafter, the outer ring is referred to as an “outer race”) having an orbital ring that rolls a rolling element composed of a ball or a roller on the inner peripheral surface, the outer race element ring. Outer race reduced in weight for incorporation into a hub unit, comprising an outer race shape material having a shape in which one or both of the outer peripheral surface and the ring end is reduced while maintaining the shape of the inner peripheral surface Raw material.   The shape of the outer race shaped material with the outer peripheral surface reduced while maintaining the shape of the ring inner peripheral surface of the outer race shaped material is equal to the outer peripheral surface of the outer race shaped material with slit-shaped grooves in the axial direction of the ring. 2. The outer race shape-reduced weight according to claim 1, wherein the outer race shape-shaped material has a shape in which the thickness of the concave groove portion is formed thinner than the thickness other than the concave groove portion. Wood.   The shape of the outer race shape material with the ring inner peripheral surface maintained in the same state is reduced, and the shape of the outer race shape material that has been reduced in size is provided with a ring-shaped concave notch at the ring end at equal intervals. 2. The weight-reduced outer race according to claim 1, wherein the outer race is made of an outer race shaped material formed in a range in which the depth of the concave notch does not reach the race ring having the inner surface of the outer race. Lace material.

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