JP5691490B2 - Cylindrical roller bearings and spindles for machine tools - Google Patents

Description

  The present invention relates to a cylindrical roller bearing and a spindle device for a machine tool, and more particularly to a cylindrical roller bearing used for a spindle of a machine tool that rotates at high speed, a high-speed motor, and the like, and a spindle device for a machine tool using the same.

  For example, spindle devices of machine tools such as machining centers, CNC lathes, and milling machines tend to be operated at high speed for reasons such as increasing the machining efficiency and accuracy of workpieces.

  Generally, in a spindle device of a machine tool, the spindle is rotatably supported with respect to a housing by rolling bearings arranged on the front side and the rear side, respectively, and the front rolling bearing normally does not allow the axial displacement of the spindle. The rear rolling bearing absorbs or releases the amount of axial expansion of the main shaft due to heat during operation, and thus has a structure that allows the axial displacement of the main shaft (free side).

  Cylindrical roller bearings are used as rolling bearings supported on the free side of the main shaft. As the cylindrical roller bearing 101, for example, as shown in FIG. 11, a cage 105 that holds a plurality of cylindrical rollers 104 disposed between an outer ring 102 and an inner ring 103 protrudes from an outer peripheral surface of a column portion 105b. The outer ring is guided by using the outer peripheral surfaces of the pair of rim portions 105 a as the guide portion 106.

  Also, as shown in FIG. 12, each circumferential end of the adjacent column portion 105b that forms the outer diameter side opening of the pocket 105c has a roller locking portion 105b1 that prevents the cylindrical roller 104 from falling off. The roller locking portion 105b1 is formed to allow elastic deformation when the cylindrical roller 104 is inserted into the pocket 105c.

  Further, in the spindle device, the rolling bearing is lubricated by a lubrication system such as oil mist lubrication, oil-air lubrication, direct injection lubrication, jet lubrication, grease lubrication, etc., depending on use conditions.

  In addition, as a bearing used under high temperature and high pressure where lubricity such as grease cannot ensure lubrication, a cage is made of a lubricating material, and the guide unit contacts and guides the raceway of the raceway. (For example, refer to Patent Document 1) and those in which a solid lubricant is disposed in a recess formed on the outer peripheral surface of a cage and the solid lubricant is slidably contacted with a raceway surface ( For example, see Patent Document 2.) Furthermore, in a split type retainer configured by combining a plurality of arc-shaped retainer elements in series in the circumferential direction, a structure in which a guide portion is provided in a part of a column portion is disclosed (for example, a patent) Reference 3).

Japanese Patent Laid-Open No. 9-49525 JP 2003-239993 A JP 2009-97525 A

  By the way, in a rolling bearing that supports the main shaft, if the grease dischargeability inside the bearing is poor, the inside of the bearing becomes excessive in the amount of lubricant, and abnormal heat rise or temperature pulsation occurs due to stirring heat. Therefore, if the bearing temperature rises, the rolling bearing may be damaged. In particular, in the case of a cylindrical roller bearing, the rolling contact portion between the inner ring raceway surface and the outer ring raceway surface and the cylindrical roller is in line contact, so that the temperature rises more easily than a point contact ball bearing.

  Furthermore, when grease-lubricating a cylindrical roller bearing, a so-called running-in operation in which the enclosed grease is evenly distributed inside the bearing or surplus grease is moved to the periphery of the bearing is indispensable.

  For this reason, in the case of a cylindrical roller bearing having an outer ring guide retainer as shown in FIGS. 11 and 12, the gap between the guide surface of the retainer and the outer ring raceway surface is narrow, and therefore, grease tends not to be discharged. In addition, it takes time to run the grease.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to smoothly discharge the lubricant while ensuring the insertability of the cylindrical roller into the pocket of the cage. An object of the present invention is to provide a cylindrical roller bearing capable of suppressing temperature and temperature pulsations, and a spindle device for machine tools using the same.

The above object of the present invention can be achieved by the following constitution.
(1) an outer ring having an outer ring raceway surface formed on the inner circumferential surface;
An inner ring having an inner ring raceway surface formed on the outer peripheral surface;
A plurality of cylindrical rollers arranged to roll freely between the outer ring raceway surface and the inner ring raceway surface;
A cage having a pair of annular rim portions and a plurality of column portions connecting the pair of rim portions in the axial direction, and forming a plurality of pockets for rotatably holding the plurality of cylindrical rollers;
A cylindrical roller bearing comprising:
The retainer is elastically deformed when the cylindrical roller is inserted into the pocket at each circumferential end of the adjacent pillars forming the outer diameter side opening of the pocket, and the cylindrical roller Has a roller locking part to prevent
The retainer is a guide that protrudes in a radial direction from the outer peripheral surface of the rim portion at the outer peripheral surface of at least three of the column portions and between the roller engaging portions at both ends in the circumferential direction of the column portion. And is guided by the guide ring .
The outer peripheral surface of the guide part is formed along an arc surface with the center of curvature as the center of the cage,
Each of the roller locking portions is formed at a position spaced from the guide portion so as to protrude radially from the outer peripheral surface of the rim portion .
(2) an outer ring having an outer ring raceway surface formed on the inner peripheral surface;
An inner ring having an inner ring raceway surface formed on the outer peripheral surface;
A plurality of cylindrical rollers arranged to roll freely between the outer ring raceway surface and the inner ring raceway surface;
A cage having a pair of annular rim portions and a plurality of column portions connecting the pair of rim portions in the axial direction, and forming a plurality of pockets for rotatably holding the plurality of cylindrical rollers;
A cylindrical roller bearing comprising:
The retainer is elastically deformed when the cylindrical roller is inserted into the pocket at each circumferential end of the adjacent pillars forming the outer diameter side opening of the pocket, and the cylindrical roller Has a roller locking part to prevent
The retainer is a guide that protrudes in a radial direction from the outer peripheral surface of the rim portion at the outer peripheral surface of at least three of the column portions and between the roller engaging portions at both ends in the circumferential direction of the column portion. And is guided by the guide ring.
The axial width of the guide portion is set to be equal to or less than the axial width of the pocket,
A concave portion having an axial width smaller than the axial width of the guide portion is formed on the outer peripheral surface of the column portion between the guide portion and each roller locking portion , and
Cylindrical roller bearings you characterized in that the pocket side end portion of the recess is formed to said pocket beyond or pocket mouth portion collinear, or the same linear in the circumferential direction.
(3) A spindle device for a machine tool, wherein the spindle is rotatably supported by the cylindrical roller bearing according to (1) or (2) .

According to the cylindrical roller bearing of the present invention, the cage is elastic when it is possible to insert the cylindrical roller into the pocket at each circumferential end of the adjacent column portion that forms the outer diameter side opening of the pocket. It has a roller locking portion that deforms and prevents the cylindrical roller from falling off, and the cage is an outer peripheral surface of at least three column portions, and each roller locking portion at both circumferential ends of the column portion. There is a guide portion that protrudes in the radial direction from the outer peripheral surface of the rim portion, and the guide ring guides the raceway. As a result, the lubricant can be smoothly discharged while ensuring the insertion property of the cylindrical roller into the pocket of the cage, and abnormal temperature rise and temperature pulsation can be suppressed.
The outer peripheral surface of the guide portion is formed along an arc surface with the center of curvature as the center of the cage, but each roller locking portion is located away from the guide portion and from the outer peripheral surface of the rim portion. Since it is formed to project in the radial direction, the rigidity of the roller locking portion is lowered, and the roller locking portion is easily deformed when the cylindrical roller is assembled.
Alternatively, the axial width of the guide portion is set to be equal to or less than the axial width of the pocket, and the outer peripheral surface of the column portion between the guide portion and each roller locking portion has an axial direction smaller than the axial width of the guide portion. Even if a recess having a width is formed and the pocket side end of the recess is on the same line as the pocket opening in the circumferential direction or beyond the same line to the pocket, The rigidity is lowered, and the roller locking portion is easily deformed when the cylindrical roller is assembled.

  Further, according to the spindle device for machine tools of the present invention, the spindle is rotatably supported by the cylindrical roller bearing of the present invention in which abnormal temperature rise and temperature pulsation are suppressed. It is possible to keep the accuracy at a high level.

It is a longitudinal cross-sectional view which shows the spindle apparatus for machine tools with which the cylindrical roller bearing which concerns on 1st Embodiment of this invention is applied. It is sectional drawing of the cylindrical roller bearing of FIG. (A) is a partial top view of a holder | retainer, (b) is sectional drawing along the III-III line of (a). The cage of the cylindrical roller bearing which concerns on 2nd Embodiment of this invention is shown, (a) is a partial top view of a cage, (b) is sectional drawing along the IV-IV line of (a). It is. 4 shows a modified example of the cage in which the axial width of the recess is changed with respect to the cage of FIG. 4, (a) is a partial top view of the cage, and (b) is a V- It is sectional drawing along the V line. The cage of the cylindrical roller bearing which concerns on 3rd Embodiment of this invention is shown, (a) is a partial top view of a cage, (b) is sectional drawing along the VI-VII line of (a). It is. The other modification of the holder | retainer which changed the shape of the guide part with respect to the holder | retainer of FIG. 6 is shown, (a) is a partial top view of a holder, (b) is VII of (a). It is sectional drawing along the -VII line. 6 shows still another modified example of the cage in which the shape of the guide portion is changed with respect to the cage of FIG. 6, (a) is a partial top view of the cage, and (b) is a diagram of (a). It is sectional drawing along a VIII-VIII line. 3 is a modification in which the number of guide portions is changed with respect to the cage in FIG. 3, (a) is a partial top view of the cage, and (b) is along the line IX-IX in (a). FIG. It is sectional drawing of the other cylindrical roller bearing to which the outer ring guide type cage was applied. It is sectional drawing of the conventional cylindrical roller bearing. (A) is a partial top view of the cage of FIG. 11, and (b) is a cross-sectional view taken along line XII-XII of (a).

  Embodiments of a cylindrical roller bearing according to the present invention and a spindle device for a machine tool using the same will be described in detail below with reference to the drawings.

(First embodiment)
FIG. 1 is a longitudinal sectional view of a spindle device for machine tools to which a cylindrical roller bearing of the present invention is applied. As shown in FIG. 1, the main shaft 11 of the main shaft device 10 is supported in a main shaft housing 13 by an angular ball bearing 12 and a cylindrical roller bearing 1 which are rolling bearings.

  The spindle housing 13 is a housing body 14, a front bearing housing 15 that is fitted and fixed to the front end (left side in the figure) of the housing body 14, and a rear side (right side in the figure) that is fitted and fixed to the rear side of the housing body 14. A side bearing housing 16, an outer ring pressing member 17 provided at the end of the front bearing housing 15, and a cover 19 provided at the rear of the rear bearing housing 16 are provided.

  The main shaft 11 is supported by two angular ball bearings 12, 12 fitted in the front bearing housing 15 and one cylindrical roller bearing 1 fitted in a sleeve 18 provided inside the rear bearing housing 16. Thus, the spindle housing 13 is rotatably supported. A plurality of outer ring spacers 20 are arranged between the outer rings of the two angular ball bearings 12 and 12 and on the outer side in the axial direction of the outer ring, and between the inner rings and between the inner rings on the outer side in the axial direction of the inner ring. A seat 21 is arranged. Further, a plurality of outer ring spacers 30 and 30 are arranged on both sides in the axial direction of the outer ring 2 (see FIG. 2) of the cylindrical roller bearing 1, and on both sides in the axial direction of the inner ring 3 (see FIG. 2). A plurality of inner ring spacers 31, 31 are arranged.

  A rotor 40 is fitted and fixed to a substantially central portion of the main shaft 11 in the axial direction. On the outer peripheral surface side of the rotor 40, a stator 41 is coaxially arranged with a predetermined distance. The stator 41 is fixed to the housing body 14 via a stator fixing member 42 disposed on the outer peripheral surface side of the stator 41. A groove 43 is formed between the housing body 14 and the stator fixing member 42 in a direction along the circumferential direction of the main shaft 11. A coolant for cooling the stator 41 flows in the plurality of grooves 43.

  Similarly, a groove 44 is formed between the housing main body 14 and the front bearing housing 15 and on the outer peripheral side of the angular ball bearing 12 to allow the coolant for cooling the housing and the bearing to flow.

  Further, the two angular ball bearings 12 and 12 and the cylindrical roller bearing 1 are lubricated with grease, and the housing main body 14, the front bearing housing 15 and the rear bearing housing 16 are discharged with grease for discharging the grease out of the apparatus. A path 45 is formed. These bearings 12, 12, and 1 may be grease replenishment lubrication in which grease is replenished to the bearings from the outside of the bearing using a lubrication device, but in this embodiment, grease is preliminarily sealed inside the bearings. Grease lubrication for lubricating the bearings 12, 12, 1 is performed.

  The cylindrical roller bearing 1 shown in FIG. 2 has an outer ring 2 having no flanges on the inner circumferential surface of which the outer ring raceway surface 2a is formed, an inner ring raceway surface 3a is formed on the outer circumferential surface, and an inner ring raceway surface 3a on both sides. An inner ring 3 having a portion 3b, a plurality of cylindrical rollers 4 rotatably disposed between the outer ring raceway surface 2a and the inner ring raceway surface 3a, and a plurality of pockets for rotatably holding the plurality of cylindrical rollers 4, respectively. And an outer ring guide type cage 5 forming 5c.

  As shown also in FIG. 3, the cage 5 has a pair of annular rim portions 5a and a plurality of column portions 5b that connect the pair of rim portions 5a in the axial direction, and is formed by injection molding a resin material. Is done. At the circumferential ends of the adjacent column portions 5b that form the outer diameter side opening of the pocket 5c, the cylindrical rollers 4 are elastically deformed when inserted into the pocket 5c and are accommodated in the pocket 5c. A roller locking portion 5b1 that prevents the cylindrical roller 4 from falling off is provided. The circumferential opening width W on the outer diameter side of the pocket 5c is reduced by about 0.05 mm to 0.5 mm with respect to the diameter of the cylindrical roller 4, and due to elastic deformation of the roller locking portion 5b1, The cylindrical roller 4 can be inserted with a certain pressure.

  The cage 5 protrudes radially outward from the outer peripheral surface of the rim portion 5a on the outer peripheral surface of each column portion 5b and between the roller engaging portions 5b1 at both ends in the circumferential direction of each column portion 5b. And a plurality of guide portions 6 that are guided by the outer ring. The outer peripheral surface of the guide portion 6 constituting the guide surface 6a is formed along a circular arc surface having the center of curvature at the center of the cage 5, and a guide gap (diameter gap) between the outer ring raceway surface 2a and the guide surface 6a. g is 0.20 to 1.0 mm.

  Since the roller locking portion 5b1 is provided away from the guide portion 6 in the circumferential direction, even when a metal material or a high-strength resin material is used for the cage 5, the roller locking portion 5b1 Therefore, it is possible to prevent the cylindrical roller 4 from being inserted due to the excessively high strength, or the occurrence of defects such as plastic deformation and chipping in the roller locking portion 5b1.

  Therefore, as shown in FIG. 3B, the circumferential width M1 of the guide portion 6 is designed to be narrower than the circumferential width M2 of the column portion 5b, and the circumferential side surface of the guide portion 6 and the column portion 5b. A grease reservoir G1 is formed at the boundary portion 7 with the outer peripheral surface of the grease. Thus, by narrowing the circumferential width M1 of the guide portion 6, the friction with the outer ring raceway surface 2a can be reduced and the bearing life can be improved, and the lubrication life can be improved by the grease reservoir G1. be able to.

  The axial width M of the guide portion 6 may be set to be equal to or smaller than the axial width P of the pocket 5c, but the axial width L and the axial width P of the pocket 5c are larger than the axial width L of the cylindrical roller 4. The difference is preferably set to be equal to or smaller than a value reduced by ΔP (ΔP = P−L) (that is, M ≦ L−ΔP). In this case, even if the cage 5 moves in the axial direction by the clearance of the pocket 5c, the grease is not scraped off by the cage 5, and the grease can be held in the vicinity of the cylindrical roller 4.

  On the other hand, the axial width M of the guide portion 6 is preferably 1/3 or more of the axial width L of the cylindrical roller 4, more preferably the axial direction, considering the unevenness of the guide portion 6 due to the inclination of the cage 5. It is preferable that it is 1/2 or more of the width L.

  In the cylindrical roller bearing 1 configured as described above, the guide portion 6 is provided on the outer peripheral surface of the column portion 5b, whereby the grease can be discharged smoothly, abnormal temperature rise can be suppressed, and stable. Operation is possible. In addition, the time for running the grease can be shortened. Furthermore, when the machine tool has not been used for a long time, even if grease accumulates inside the bearing, the grease is better discharged, and the possibility that the bearing will be damaged due to abnormal temperature rise is reduced.

  Further, the cylindrical roller bearing 1 of the present embodiment has a cylindrical roller 4 having a guide portion 106 of the cage 105 which is located in the vicinity of both sides in the axial direction of the cylindrical roller 104 as compared with the cylindrical roller bearing 101 as shown in FIG. The grease reservoir G can be formed in the vicinity, and the grease can be easily guided to the cylindrical roller 4 through the outer ring raceway surface 2a, and the occurrence of oil film breakage can be suppressed. Since grease contains a base oil in a thickener, the base oil can move to some extent within the grease when an action such as a temperature rise is applied, and the grease reservoir G is connected to the outer ring raceway surface 2a. If so, the surface tension effect and the wettability effect also act, and it is easy to guide the grease to the rolling contact portion between the outer ring raceway surface 2a and the rolling surface of the cylindrical roller 4, and the occurrence of oil film breakage can be suppressed. In this embodiment, a large grease reservoir G can be secured inside the bearing, and more grease can remain inside the bearing. Therefore, even with the grease lubrication with the encapsulated grease as in the present embodiment, a sufficient lubrication life can be ensured.

  Further, the main shaft 11 of the machine tool main spindle device 10 is mainly in the case of inner ring rotation, and the temperature distribution of the main shaft 11 is such that the temperature of the rotating side member (inner ring side) is higher than the temperature of the stationary side member (outer ring side). Get higher. In the case of a so-called motor built-in main shaft in which a motor is provided between the front bearing (fixed side) and the rear bearing (free side) of the main shaft 11 as in this embodiment, the influence of heat generation of the motor is added. The Since the cylindrical roller bearing 1 of this embodiment can increase the sliding allowance of the inner ring 3 with respect to the outer ring 2 as compared with the cylindrical roller bearing 101 shown in FIG. 11 (Δr1 <Δr2), the main shaft 11 expands due to a temperature rise. Even if the inner ring 3 moves to the rear of the main shaft with respect to the outer ring 2, it is possible to prevent the guide portion 6 of the cage 5 from being detached from the outer ring raceway surface 2a.

  Moreover, in this embodiment, since the guide part 6 is provided apart from the roller latching | locking part 5b1 between each roller latching | locking part 5b1 of the circumferential direction both ends of the pillar part 5b, the pocket of the holder | retainer 5 is provided. The insertability of the cylindrical roller 4 into 5c can be ensured. Furthermore, the lubrication life can be improved by the grease reservoir G1 formed at the boundary portion 7 between the guide portion 6 and the column portion 5b.

(Second Embodiment)
Next, a cylindrical roller bearing according to a second embodiment of the present invention will be described with reference to FIG. In addition, since this embodiment is different from the first embodiment only in the shape of the cage 5, the same or equivalent parts are denoted by the same reference numerals, and description thereof is omitted or simplified.

  In the cage 5 of the present embodiment, the axial width of the guide portion 6 on the outer peripheral surface of the column portion 5b between the guide portion 6 and each roller locking portion 5b1 with respect to the cage 5 of the first embodiment. A recess 6b having the following axial width is formed. In this embodiment, the recess 6b is formed so as to be recessed inward in the radial direction along the circumferential side surface of the guide portion 6, that is, the grease formed by the recess 6b at the boundary portion between the guide portion 6 and the column portion 5. The reservoir G1 is configured.

  Therefore, in this cage 5, it is possible to expect an improvement in the lubrication life due to the accumulation of grease in the recess 6b and bleeding of the grease. Further, since the rigidity of the roller locking portion 5b1 is further lowered, the roller locking portion 5b1 is easily deformed when the cylindrical roller 4 is assembled, and the roller insertion property can be improved.

  In the embodiment shown in FIG. 4, the recess 6 b has an axial width equal to the axial width of the guide portion 6, but as shown in FIG. 5, an axis smaller than the axial width of the guide portion 6. The width may be the direction width and the circumferential width may be increased. In this case, the pocket-side end 6b1 of the recess 6b may be formed on the same line as the pocket mouth part 5c1 in the circumferential direction or on the pocket 5c side beyond the same line. Thereby, the rigidity of the roller locking portion 5b1 is further reduced, and the roller insertion property can be further improved. Also in FIG. 5, it is possible to expect an improvement in the lubrication life due to the accumulation of grease in the recess 6b and the grease bleeding.

(Third embodiment)
Next, a cylindrical roller bearing according to a third embodiment of the present invention will be described with reference to FIG. In this embodiment, since the shape of the cage 5 is different from that of the first embodiment, the same or equivalent parts are denoted by the same reference numerals, and description thereof is omitted or simplified.

  In the cage 5 of the above embodiment, the roller locking portion 5b1 is formed between the outer peripheral surface of the column portion 5b having the same diameter as the outer diameter of the rim portion 5a and the circumferential side surface of the pocket 5c. In the cage 5 of the present embodiment, the roller locking portion 5b1 is formed to project radially outward from the outer peripheral surface of the column portion 5b. Thereby, the roller latching | locking part 5b1 becomes a position spaced apart from the guide part 6, the rigidity of the roller latching | locking part 5b1 falls, and it can make it easy to elastically deform.

  In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

  In the above embodiment, the guide portion 6 is formed continuously from the axial intermediate portion to both sides in the axial direction. For example, as in the embodiment shown in FIG. 7, a pair of guide portions 6 are provided on both sides in the axial direction. Each may be formed. Moreover, as shown in FIG. 8, a pair of guide part 6 may be continuously formed in the circumferential direction to the mouth part 5c1 of the pocket 5c.

  In the above-described embodiment, the guide portions 6 are provided in all the column portions 5b. However, the guide portions 6 may be provided in at least three column portions 5b at equal intervals in the circumferential direction. For example, as illustrated in FIG. The guide part 6 may be provided on every other pillar part 5b.

  Furthermore, as shown in FIG. 10, the present invention includes an outer ring 2 in which an outer ring raceway surface 2a and a flange portion 2b are formed on the inner peripheral surface, and a wrinkleless inner ring 3 in which an inner ring raceway surface 3a is formed on the outer peripheral surface. The cylindrical roller bearing 1 having the above-described configuration may include an outer ring guide type cage 5 disposed in a raceway groove formed by the outer ring raceway surface 2a and the flange portions 2b on both sides.

  In the spindle device 10 for machine tools of the present invention, an example in which two angular ball bearings 12 and 12 are arranged on the front side of the motor and one cylindrical roller bearing 1 is arranged on the rear side is given. The arrangement and number are not limited to the above, and can be arbitrarily set. For example, one cylindrical roller bearing and two angular ball bearings may be arranged on the front side of the motor, one cylindrical roller bearing may be arranged on the rear side, and four angular ball bearings may be arranged on the front side. One cylindrical roller bearing may be arranged on the side.

  Further, the lubricant for lubricating the angular ball bearings 12 and 12 and the cylindrical roller bearing 1 is not limited to the grease as in the present embodiment, and may be a lubricating oil.

DESCRIPTION OF SYMBOLS 1 Cylindrical roller bearing 2 Outer ring 2a Outer ring raceway surface 3 Inner ring 3a Inner ring raceway surface 4 Cylindrical roller 5 Cage 5a Rim part 5b Column part 5b1 Roller latching part 5c Pocket 6 Guide part 6a Guide surface 6b Concave part 10 Spindle device 11 Spindle G1 Grease Pool

Claims (3)

An outer ring having an outer ring raceway surface formed on the inner circumferential surface;
An inner ring having an inner ring raceway surface formed on the outer peripheral surface;
A plurality of cylindrical rollers arranged to roll freely between the outer ring raceway surface and the inner ring raceway surface;
A cage having a pair of annular rim portions and a plurality of column portions connecting the pair of rim portions in the axial direction, and forming a plurality of pockets for rotatably holding the plurality of cylindrical rollers;
A cylindrical roller bearing comprising:
The retainer is elastically deformed when the cylindrical roller is inserted into the pocket at each circumferential end of the adjacent pillars forming the outer diameter side opening of the pocket, and the cylindrical roller Has a roller locking part to prevent
The retainer is a guide that protrudes in a radial direction from the outer peripheral surface of the rim portion at the outer peripheral surface of at least three of the column portions and between the roller engaging portions at both ends in the circumferential direction of the column portion. And is guided by the guide ring .
The outer peripheral surface of the guide part is formed along an arc surface with the center of curvature as the center of the cage,
Each of the roller locking portions is formed at a position spaced from the guide portion so as to protrude radially from the outer peripheral surface of the rim portion . An outer ring having an outer ring raceway surface formed on the inner circumferential surface;
An inner ring having an inner ring raceway surface formed on the outer peripheral surface;
A plurality of cylindrical rollers arranged to roll freely between the outer ring raceway surface and the inner ring raceway surface;
A cage having a pair of annular rim portions and a plurality of column portions connecting the pair of rim portions in the axial direction, and forming a plurality of pockets for rotatably holding the plurality of cylindrical rollers;
A cylindrical roller bearing comprising:
The retainer is elastically deformed when the cylindrical roller is inserted into the pocket at each circumferential end of the adjacent pillars forming the outer diameter side opening of the pocket, and the cylindrical roller Has a roller locking part to prevent
The retainer is a guide that protrudes in a radial direction from the outer peripheral surface of the rim portion at the outer peripheral surface of at least three of the column portions and between the roller engaging portions at both ends in the circumferential direction of the column portion. And is guided by the guide ring.
The axial width of the guide portion is set to be equal to or less than the axial width of the pocket,
A concave portion having an axial width smaller than the axial width of the guide portion is formed on the outer peripheral surface of the column portion between the guide portion and each roller locking portion , and
Cylindrical roller bearings you characterized in that the pocket side end portion of the recess is formed to said pocket beyond or pocket mouth portion collinear, or the same linear in the circumferential direction. Spindle machine tool spindle device, characterized in that it is rotatably supported by the cylindrical roller bearing according to claim 1 or 2.

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