Rotary machine device

Abstract

To provide a rotary machine device capable of integrating and miniaturizing machine elements, and making them separable without damaging a bearing.SOLUTION: At least one of two angular ball bearings performs fitting of an inner ring to a rotation shaft by interference-fitting. In the angular ball bearing out of the two angular ball bearings on which a reverse axial load acts in a direction reverse to a direction where the angular ball bearing can receive an axial load when pulling out the rotation shaft in an axial direction from a rotary machine device, a bearing ring of one of the inner ring and an outer ring has a catch part with a height permitting separation from an assembly having a bearing ring of the other of the inner ring and the outer ring, a ball and a holder.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rotary machine device including at least two angular contact ball bearings that rotatably support a rotary shaft. [Background technology]

[0002] In conventional rotating machines, each element, such as a motor and a gear device, is manufactured as a separate device, and the rotating shafts of these devices are generally fastened together by a coupling or the like.

[0003] For example, in a rotating machine including a gear device and a motor that drives the gear device, the input shaft of the gear device and the motor shaft of the motor are fastened together by a coupling, and the respective housings are fastened together by screws. The motor shaft is supported at both ends by a pair of bearings, and since a large load can usually be applied to the drive side, the drive side bearing is larger than the non-drive side bearing. In a structure in which the motor shaft rotates and the housing side is stationary, when a radial load acts on the motor shaft in a certain direction, the fit of each bearing is an interference fit between the inner ring and shaft, and a clearance fit between the outer ring and housing.

[0004] When disassembling a motor with this type of structure, first remove the front cover on the drive side. At this time, since there is a gap between the outer ring and the housing, the front cover can be removed without applying excessive force to the bearing. Next, the motor shaft with the bearings attached can be pulled out toward the front cover using, for example, the procedures and tools described in the bearing catalog, allowing the bearings to be removed without damaging them.

[0005] Like the motor shaft, the input shaft of the gear device is supported at both ends by a pair of bearings and has the same fitting conditions and front cover structure as the motor shaft. This means that the gear device can be disassembled and the bearings removed from the input shaft without applying undue force to the bearings.

[0006] In the tandem angular contact ball bearing described in Patent Document 1, the entire portion of the inner circumferential surface of the outer ring from the outer ring raceway, which has a smaller inner diameter, to the connecting portion with the end face on the larger inner diameter side, and the entire portion of the outer circumferential surface of the inner ring from the inner ring raceway, which has a larger outer diameter, to the connecting portion with the end face on the smaller outer diameter side of the inner ring, are free of irreducible corners in cross-sectional shape and are polished to be smooth surfaces. This prevents damage such as scratches on the rolling surfaces of the balls when the bearing is assembled between the inner circumferential surface of the support hole of the support part on the fixed side and the outer circumferential surface of the pinion shaft, prevents excessive vibration and noise during operation, and ensures excellent durability. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 5600927 Summary of the Invention [Problem to be solved by the invention]

[0008] Incidentally, in recent years, against the backdrop of the trend toward resource conservation, cost reduction, and weight reduction, rotating machinery devices having a compact structure in which the mechanical elements of the motor and gear device are integrated have come into use.

[0009] For this reason, the rotor of the motor and the drive gear of the gear device are attached to a single rotating shaft. If the rotating shaft can be supported at two points by bearings, it becomes a so-called "statically determined beam," and the variation in bearing load caused by factors such as the dimensions, precision, and installation precision of parts and the load acting on the machine can be reduced. On the other hand, if a rotating shaft is supported at three points by bearings, it becomes a "statically indeterminate beam," and the load acting on each bearing fluctuates depending on the shaft, its dimensions, and shape, making it prone to instability from the standpoint of mechanical design. For this reason, for example, bearings are arranged only on both ends of the motor rotor, and a type of bearing with a large load capacity, such as a duplex angular contact ball bearing, is used between the rotor and the drive gear.

[0010] In addition, in a gear device, the tooth contact between the drive gear and the driven gear must be precisely adjusted. On the other hand, in a motor, the axial positional deviation between the rotor and the stator is more tolerable than in a gear device. For this reason, the duplex angular contact ball bearing disposed between the rotor and the drive gear is preferably disposed in the housing on the gear device side.

[0011] To disassemble such a rotating machine, the rotating shaft is pulled out toward the gear device. Here, since the inner ring of the duplex angular ball bearing is tightly fitted with the rotating shaft, a reverse axial load acts on one of the angular ball bearings, which is the opposite direction to the direction in which the angular ball bearing can bear an axial load. As a result, the balls may bite into the edge of the raceway, called the engagement allowance, causing damage to the raceway and balls, which makes it impossible to reuse the bearing.

[0012] The tandem angular contact ball bearing described in Patent Document 1 is designed to only support axial loads in one direction and is intended to prevent damage to the balls during machine assembly. As such, it does not take into consideration the effects of reverse axial loads during disassembly and does not solve the above-mentioned problems.

[0013] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a rotating machinery device in which mechanical elements are integrated to make it compact and which can be disassembled without damaging the bearings. [Means for solving the problem]

[0014] Therefore, the above object of the present invention can be achieved by the following configurations [1] and [2] relating to a rotating machine. [1] A rotating machine device that uses at least two angular contact ball bearings to support a rotating shaft rotatably relative to a housing, At least one of the two angular ball bearings has an inner ring and a rotating shaft fitted together by an interference fit, In the angular ball bearing of the two angular ball bearings, a reverse axial load acts on the angular ball bearing in a direction opposite to a direction in which the angular ball bearing can receive an axial load when the rotating shaft is axially pulled out from the rotating machine device, and one of the raceways of the inner ring and the outer ring has a catch portion having a height that allows the raceway of the inner ring and the outer ring to be separated from an assembly having the other raceway of the inner ring and the outer ring, balls, and a cage. Rotating machinery equipment.

[0015] [2] A rotating machine device that uses at least two angular contact ball bearings to support a rotating shaft rotatably relative to a housing, At least one of the two angular ball bearings has an inner ring and a rotating shaft fitted together by an interference fit, Among the paired angular ball bearings, in the angular ball bearing on which a reverse axial load acts, which is the opposite direction to the direction in which the angular ball bearing can receive an axial load when the rotating shaft is axially pulled out from the rotating machine device, the hardness of the balls is higher than the hardness of the engagement portion of the raceway that can be separated from the balls. Rotating machinery equipment. Effect of the Invention

[0016] According to the rotating machinery of the present invention, it is possible to provide a rotating machinery in which mechanical elements are integrated to make it compact, and which can be disassembled without damaging the bearings. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a cross-sectional view of a rotating machine according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view of a rotating shaft with an angular ball bearing exploded from the rotating machine device of FIG. [Diagram 3] FIG. 3 is a cross-sectional view of an angular contact ball bearing exploded into an outer ring and an assembly of an inner ring, balls and a cage. [Figure 4] FIG. 4 is an enlarged view for explaining the radial internal clearance of the angular ball bearing. [Diagram 5] FIG. 5 is a cross-sectional view of an angular contact ball bearing exploded into an inner ring and an assembly of an outer ring, balls and a cage. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a rotating machine according to the present invention will be described in detail with reference to the drawings. (First embodiment) As shown in FIG. 1, a rotating machine 10 according to a first embodiment includes a gear device 20 and a motor 30 that drives the gear device 20, which are integrally coupled to each other.

[0019] The gear device 20 includes a drive gear 21 fixed to one end of a rotating shaft 31, and a driven gear 22 meshing with the drive gear 21. One end of a gear shaft 23 to which the driven gear 22 is fixed is cantilevered on a gear side housing 25 by a pair of angular contact ball bearings 24, 24 assembled back to back.

[0020] A rotor 32 of a motor 30 is fixed to the middle part of a rotating shaft 31 having a driving gear 21 fixed to one end side (left side in the figure). A stator 34 fixed to a motor housing 33 is disposed radially outward of the rotor 32.

[0021] A pair of angular contact ball bearings 35A, 35B are arranged back-to-back between the drive gear 21 and the rotor 32, and a ball bearing 50 is arranged at the other end (the right end in FIG. 1) of the rotating shaft 31, so that the rotating shaft 31 is rotatably supported at two points. The outer ring 51 of the ball bearing 50 is fitted into an outer ring holder 54 provided on the rear cover 12, and the inner ring 52 is fitted into the small diameter portion 31c of the rotating shaft 31, with its left end face abutting against the stepped portion 31b. The outer ring 51 is biased leftward in the figure by the elastic force of a disc spring 55 arranged between the outer ring 51 and a shoulder portion 54a of the outer ring holder 54.

[0022] Referring also to Figure 3, angular ball bearings 35A, 35B comprise outer rings 36A, 36B which have outer ring raceways 36a1, 36b1, respectively, on their inner peripheral surfaces and are fitted inside gear side housing 25, inner rings 37A, 37B which have inner ring raceways 37a1, 37b1, respectively, on their outer peripheral surfaces and are fitted outside rotating shaft 31, a plurality of balls 38A, 38B which are arranged with a contact angle θ between the outer ring raceways 36a1, 36b1 and the inner ring raceways 37a1, 37b1, and retainers 39A, 39B which rotatably hold each row of a plurality of balls 38A, 38B, respectively. The pair of angular contact ball bearings 35A, 35B are essentially the same bearings, except that they are mounted in different directions.

[0023] The inner raceways 37a1, 37b1 of the inner rings 37A, 37B have a groove depth such that the balls 38A, 38B do not come off the inner raceways 37a1, 37b1. The outer raceways 36a1, 36b1 of the outer rings 36A, 36B are provided with an engagement portion 41 on one axial side (the side opposite to the direction in which the axial load acts, the left side in the outer raceway 36a1 in FIG. 3). The height H of the engagement portion 41 is smaller than 1 / 2 the radial internal clearance Δr of the angular ball bearings 35A, 35B. That is, the outer rings 36A, 36B have the engagement portion 41 at a height that allows them to be separated from the assembly (hereinafter also referred to as the inner ring assembly 45) of the inner rings 37A, 37B, the balls 38A, 38B, and the cages 39A, 39B. The height H of the engagement portion 41 is set to H>0 in order to make it easier to measure the diameter of the groove bottom of the outer ring raceway.

[0024] Here, the radial internal clearance Δr is defined on a diameter basis, as shown in Figure 4. For example, the radial internal clearance Δr in a cross section passing through the 0° phase of a bearing is the sum of the radial clearances between the raceway and balls in the cross section at the 0° phase and the cross section at the 180° phase (Δr = Δre + Δri). On the other hand, the engagement height H of the raceway refers to the amount of interference between the balls and raceway in a certain cross section. In addition, in Figure 4, Δs is the axial clearance, Dw is the diameter of the ball, Oa is the center of the ball, Oe is the center of curvature of the groove of the outer ring, Oi is the center of curvature of the groove of the inner ring, re is the groove radius of the outer ring, and ri is the groove radius of the inner ring.

[0025] Returning to Fig. 1, the inner rings 37A and 37B are fitted to the rotating shaft 31 with an interference fit, and the outer rings 36A and 36B are fitted to the gear-side housing 25 with a clearance fit. The outer ring 36A of the angular ball bearing 35A on the drive gear 21 side has its drive gear side side (left side in Fig. 1) in contact with the right side of a shoulder 40 that protrudes from the inner peripheral surface of the gear-side housing 25 to the inner diameter side, and the inner ring 37A of the angular ball bearing 35A on the drive gear 21 side abuts on a step 31a of the rotating shaft 31. The outer ring 36B of the angular ball bearing 35B on the rotor 32 side has its rotor side side (right side in Fig. 1) in contact with an outer ring pressing cover 60 attached to the gear-side housing 25, and the inner ring 37B of the angular ball bearing 35B on the rotor 32 side is positioned by a nut 62 via a spacer 61. As a result, the pair of angular ball bearings 35A, 35B are clamped by the shoulder portion 40, the step portion 31a of the rotating shaft 31, the outer ring pressing cover 60, and the nut 62, and their axial positions are determined. The inner diameter d of the hole provided in the shoulder portion 40 is set to be smaller than the outer diameter D of the outer rings 36A, 36B and larger than the inner diameter D1 (see FIG. 3) on the counterbore side of the outer rings 36A, 36B.

[0026] The outer diameter of the rotating shaft 31 at the portion where the rotor 32 is attached is smaller than the outer diameter of the portion where the inner rings 37A, 37B are attached, so that the inner ring 37B can be easily attached and detached during disassembly and assembly as described below.

[0027] The rotating machine 10 having such a structure may need to be disassembled for maintenance, etc. The inner diameter d of a hole provided in the shoulder 40 of the gear-side housing 25, against which the drive gear side surface of the outer ring 36A of the angular ball bearing 35A abuts, is smaller than the outer diameter D of the outer ring 36B and smaller than the outer diameter D2 of the drive gear 21 fixed to the rotating shaft 31. For this reason, in order to disassemble the rotating machine 10, first, the front cover 11, the rear cover 12, the ball bearing 50, and the rotor 32 are removed, and then the outer ring holding cover 60 is removed from the gear-side housing 25, and the spacer 61 and the nut 62 are removed from the rotating shaft 31, and then the rotating shaft 31 is pulled out toward the drive gear 21 (leftward in FIG. 1). At that time, the outer ring 36A of angular ball bearing 35A and the entire angular ball bearing 35B are removed by shoulder portion 40 on the gear housing side, and only bearings 37A, 38A, and 39A are held on rotating shaft 31 as shown in FIG. 2.

[0028] In addition, in the angular ball bearings 35A, 35B of this embodiment, the inner rings 37A, 37B are fitted to the rotating shaft 31 with an interference fit, and the outer rings 36A, 36B are fitted to the gear-side housing 25 with a clearance fit. Therefore, frictional force due to the interference fit is generated between the rotating shaft 31 and the inner rings 37A, 37B, and a reverse axial load acts on the angular ball bearing 35A.

[0029] Here, in a conventional angular ball bearing having a larger height of the engagement portion compared to the angular ball bearing 35A of this embodiment, when a reverse axial load is applied, inside the bearing, the balls 38A bite into the edge portion of the engagement portion 41 of the outer ring 36A, and the engagement portion 41 between the balls 38A and the outer ring raceway 36a1 may be plastically deformed and damaged.

[0030] The balls 38A do not pass through the overlapping portion 41 during the rotation of the bearing, so even if it is slightly damaged, it does not cause any practical operational problems. However, the entire surface of the balls 38A comes into contact with the raceway surface during operation, so the contact of the ball damage with the raceway surface will damage the raceway surface, causing abnormal noise and vibration in the bearing. Furthermore, abnormal stress concentration occurs in the ball damage and in the transferred damage that occurs on the raceway surface due to contact with the uneven surface of the ball damage, especially in the convex parts, which may cause damage called flaking during an operating time that is significantly shorter than the design life. Therefore, if damage occurs inside the angular contact ball bearing when disassembling a rotating machine for inspection, etc., the bearing cannot be reused.

[0031] On the other hand, since the height H of the engagement portion 41 of the angular ball bearing 35A in this embodiment is smaller than 1 / 2 the radial internal gap Δr of the angular ball bearing 35A, there is no risk of strong interference between the balls 38A and the engagement portion 41, damage to the surfaces of the balls 38A and the outer ring raceway 36a1 can be prevented, and the bearing can be reused.

[0032] Furthermore, in this embodiment, the outer ring 36A and angular ball bearing 35B remaining inside the gear-side housing 25 can be removed from the gear-side housing 25 for inspection by pushing the outer ring 36A in the axial direction (to the right in FIG. 1) with a removal jig (not shown) by setting the inner diameter d of the hole formed in the shoulder portion 40 to be larger than the inner diameter D1 (see FIG. 3) of the axial end face of the outer ring 36A.

[0033] Furthermore, inner ring raceway 37a1 of inner ring 37A has a groove depth that prevents balls 38A from coming off inner ring raceway 37a1, and height H of engagement portion 41 of outer ring 36A is set to be smaller than 1 / 2 the radial internal clearance Δr of angular ball bearing 35A, so that angular ball bearing 35A is not easily disassembled when handled alone, and even if it is disassembled, inner ring 37A, together with retainer 39A and balls 38A, can be handled as inner ring side assembly 45, improving workability and preventing damage to balls 38A due to interference with engagement portion 41 even when a reverse axial load is applied.

[0034] To prevent the individual parts from falling apart when angular contact ball bearing 35A is disassembled, the opening dimension on the outer diameter side of the pocket in cage 39A is made slightly smaller than the diameter of balls 38A. Furthermore, it is desirable that the material and shape of cage 39A be elastically deformable so that balls 38A can be snap-fitted from the outer diameter side of cage 39A.

[0035] Also, an axial notch, a cylindrical hole, a screw hole, or the like may be provided in the shoulder portion 40 of the gear-side housing 25, and the side surface of the outer ring 36A may be pushed out with a rod or a screw so that the outer ring 36A can be removed from the gear-side housing 25. From the viewpoint of workability and manufacturing costs, it is preferable to provide multiple notches, cylindrical holes, screw holes, or the like, for example, about three locations equally spaced circumferentially.

[0036] On the other hand, after inspecting the angular ball bearings 35A, 35B, when assembling them to the rotating shaft 31, the assembly of the rotating shaft 31 and the gear 21 is inserted into the gear housing 25, and the angular ball bearings 35A, 35B are press-fitted or shrink-fitted together from the right side in Figure 1.

[0037] In order to prevent bearing damage during disassembly of rotating machinery 10, which is an object of the present invention, only one of the angular ball bearings (bearings subjected to a reverse axial load) 35A may be of the separable type that can be separated into outer ring 36A and inner ring side assembly 45, but all of the rows of angular ball bearings 35A, 35B may be of the separable type. This makes handling easier, as there is no need to take special consideration of the combination of parts or the orientation of the combined bearing during manufacturing of the bearings or when mounting the bearings on a machine.

[0038] Furthermore, when multiple separable bearings are handled simultaneously, it is desirable to have no restrictions on the combination of the outer rings 36A, 36B and the inner ring side assembly 45. However, in order to ensure the internal clearance of the bearings, the bearing assembly width, and the differential width, it may be necessary to specify the combination of the outer rings 36A, 36B and the inner ring side assembly 45. In such cases, ease of handling can be improved by giving each of the outer rings 36A, 36B and the inner ring side assembly 45 a unique symbol such as a serial number. The unique symbol can be a combination of numbers and letters displayed on the actual product, or it can be displayed as a barcode (one-dimensional, two-dimensional, etc.).

[0039] In addition, in this embodiment, the outer rings 36A, 36B, the inner rings 37A, 37B and the balls 38A, 38B may be formed from materials having the same quality and hardness, such as bearing steel (HV600-900) such as SUJ2 (high carbon chromium bearing steel). On the other hand, the material of the balls 38a, 38B may be selected so that the hardness of the balls 38A, 38B is set sufficiently higher than the hardness of the engagement portion 41 of the outer rings 36A, 36B. Specifically, it is preferable that the outer rings 36A, 36B and the inner rings 37A, 37B are formed from bearing steel such as SUJ2, and the balls 38A, 38B are formed from a material with a hardness of HV1000 or higher, such as silicon nitride (HV1500) or zirconia (HV1300). This prevents the surface of the ball 38A from being scratched by contact between the ball 38A and the engagement portion 41 of the outer ring 36A when the rotating machine 10 is disassembled. On the other hand, although the engagement portion 41 may undergo plastic deformation due to contact with the balls 38A, the engagement portion 41 does not come into contact with the balls 38A while the bearing is rotating, so the angular ball bearing 35A does not lose its functionality during use (smooth rotation, little vibration and noise, and a designed lifespan). This makes it possible to more reliably reuse the bearing.

[0040] (Modification) Incidentally, the angular ball bearings 35A, 35B may have the configuration shown in Fig. 5 instead of the configuration shown in Fig. 3. That is, the angular ball bearings 35A, 35B have groove depths on both sides of the outer ring raceways 36a1, 36b1 that are deep enough to prevent the balls 38A, 38B from coming off the outer ring raceways 36a1, 36b1, and the inner ring raceways 37a1, 37b1 are provided with an engagement portion 41 on one axial side (the side opposite to the direction in which the axial load acts, and the right side in the inner ring raceways 37a1, 37b1 in Fig. 5). The height H of the engagement portion 41 is smaller than 1 / 2 the radial internal clearance Δr of the angular ball bearings 35A, 35B. That is, the inner rings 37A, 37B have engagement portions 41 of a height that allows them to be separated from an assembly (hereinafter also referred to as an outer ring side assembly 46) including the outer rings 36A, 36B, the balls 38A, 38B, and the cages 39A, 39B.

[0041] Even in this case, when the rotating shaft 31 is disassembled, a reverse axial load acts on the angular ball bearing 35A, but there is no risk of strong interference between the balls 38A and the engagement portion 41, and the surfaces of the balls 38A and the inner ring raceway 37a1 are not damaged, making it possible to reuse the bearing.

[0042] In this modified example, the structure of cage 39A is such that the opening dimensions on the inner diameter side of the pockets in cage 39A are slightly smaller than the diameter of balls 38A so that the individual parts do not fall apart when angular contact ball bearing 35A is disassembled. Furthermore, it is desirable that the material and shape of cage 39A be elastically deformable so that balls 38A can be snap-fitted from the inner diameter side of cage 39A.

[0043] In this way, by making the bearing structure separable into the inner ring 37A and the outer ring side assembly 46, only the inner ring 37A remains on the rotating shaft 31 when disassembling the rotating machinery 10, making handling easy. Also, when providing a seal structure (not shown) on the inner diameter surface of the shoulder portion 40 of the gear side housing 25, the seal inner diameter surface can be slid axially over the outer circumferential surface of the rotating shaft 31 to insert and remove the rotating shaft 31, which is advantageous in terms of ease of disassembly and assembly of the machine.

[0044] The present invention is not limited to the above-described embodiment, and can be modified, improved, etc. as appropriate. For example, in the above embodiment, in an angular ball bearing on which a reverse axial load acts when the rotating shaft 31 is pulled axially out of the rotating machinery device 10, the inner or outer ring is configured to have a latch portion of a height that allows it to be separated from the assembly, and further, preferably, in an angular ball bearing on which a reverse axial load acts, the hardness of the balls is made higher than the hardness of the latch portion of the raceway ring that can be separated from the balls. However, the present invention is not limited to this, and the hardness of the balls may be made higher than the hardness of the engagement portion of the raceway that is separable from the balls in an angular contact ball bearing in which the inner or outer ring has a standard engagement portion of a height that makes it impossible to separate from the assembly. As a result, when the rotating shaft 31 is disassembled, in the angular contact ball bearing 35A on which a reverse axial load acts, the engagement portion 41 may be damaged, but the balls 38A will not be damaged, and the bearing can be reused.

[0045] As described above, the present specification discloses the following: (1) A rotating machine device that uses at least two angular contact ball bearings to support a rotating shaft rotatably relative to a housing, At least one of the two angular ball bearings has an inner ring and a rotating shaft fitted together by an interference fit, In the angular ball bearing of the two angular ball bearings, a reverse axial load acts on the angular ball bearing in a direction opposite to a direction in which the angular ball bearing can receive an axial load when the rotating shaft is axially pulled out from the rotating machine device, and one of the raceways of the inner ring and the outer ring has a catch portion having a height that allows the raceway of the inner ring and the outer ring to be separated from an assembly having the other raceway of the inner ring and the outer ring, balls, and a cage. Rotating machinery equipment. With this configuration, the angular ball bearing on the side on which the reverse axial load acts is of a separable structure, so regardless of the structure of the rotating machinery device or the fit conditions between the bearing and surrounding parts (rotating shaft, housing), no damage will occur inside the bearing when it is disassembled. Therefore, the bearing can be disassembled and reassembled without compromising its functionality during use. This allows the bearing to be reused, contributing to economics and resource conservation.

[0046] (2) The height of the engagement portion of the one of the raceways of the angular ball bearing on which the reverse axial load acts is smaller than 1 / 2 of the radial internal clearance of the angular ball bearing. A rotating machine device as described in (1). With this configuration, the angular ball bearing can be disassembled without damaging the raceway surfaces of the outer and inner rings.

[0047] (3) In the angular contact ball bearing on which the reverse axial load acts, the hardness of the balls is made higher than the hardness of the engagement portion of either one of the raceways. A rotating machine device according to (1) or (2). According to this configuration, damage to the balls by the engagement portion of the race can be suppressed when the angular ball bearing is disassembled.

[0048] (4) The inner diameter of a hole provided in a shoulder portion of the housing against which a side surface of the outer ring of the angular ball bearing abuts is smaller than the outer diameter of the outer ring and is smaller than the outer diameter of a portion of the rotating shaft on the outer ring side relative to the shoulder portion of the housing or an outer diameter of a part fixed to the rotating shaft. The rotating machine according to any one of (1) to (3). According to this configuration, the outer ring can be pushed axially to one side by a removal tool or the like and removed from the housing.

[0049] (5) A rotating machine device in which a rotating shaft is rotatably supported relative to a housing by using at least two angular contact ball bearings, At least one of the two angular ball bearings has an inner ring and a rotating shaft fitted together by an interference fit, Of the two angular ball bearings, in the angular ball bearing on which a reverse axial load acts, which is opposite to the direction in which the angular ball bearing can receive an axial load when the rotating shaft is axially pulled out from the rotating machine device, the hardness of the ball is higher than the hardness of a bearing portion of a raceway that can be separated from the ball. Rotating machinery equipment. According to this configuration, even if a reverse axial load is applied when disassembling the angular ball bearing, damage to the balls of the angular ball bearing can be suppressed. This allows the bearing to be reused, which contributes to economics and resource conservation. [Explanation of symbols]

[0050] 10 Rotating machinery 25 Gear side housing (housing) 31 Rotation axis 35A, 35B angular contact ball bearings 36A, 36B Outer ring 36a1, 36b1 Outer raceway 37A, 37B Inner ring 37a1, 37b1 Inner raceway 38A, 38B balls 39A, 39B retainer 40 Shoulder (side wall of housing) 41 Hanging allowance 45 Inner race assembly (assembly) 46 Outer ring side assembly (assembly) D Outer diameter of outer ring d Inner diameter of hole H Height of the hook Δr Radial internal clearance

Claims

1. A rotating machine device that uses at least two angular contact ball bearings to support a rotating shaft rotatably relative to a housing, comprising: At least one of the two angular ball bearings has an inner ring and a rotating shaft fitted together by an interference fit, In the angular ball bearing of the two angular ball bearings, a reverse axial load acts on the angular ball bearing in a direction opposite to a direction in which the angular ball bearing can receive an axial load when the rotating shaft is axially pulled out from the rotating machine device, and one of the raceways of the inner ring and the outer ring has a catch portion having a height that allows the raceway to be separated from an assembly having the other raceway of the inner ring and the outer ring, balls, and a cage. Rotating machinery equipment.

2. a height of an engagement portion of the one of the raceways of the angular ball bearing on which the reverse axial load acts is smaller than a radial internal clearance of the angular ball bearing; 2. The rotating machinery device according to claim 1.

3. In the angular contact ball bearing on which the reverse axial load acts, the hardness of the ball is made higher than the hardness of the engagement portion of the raceway which is separable from the ball.

2. The rotating machinery device according to claim 1.

4. an inner diameter of a hole provided in a shoulder portion of the housing against which a side surface of the outer ring of the angular ball bearing abuts is smaller than an outer diameter of the outer ring, and is smaller than an outer diameter of a portion of the rotating shaft on the outer ring side relative to the shoulder portion of the housing, or an outer diameter of a part fixed to the rotating shaft; 2. The rotating machinery device according to claim 1.

5. A rotating machine device that uses at least two angular contact ball bearings to support a rotating shaft rotatably relative to a housing, comprising: At least one of the two angular ball bearings has an inner ring and a rotating shaft fitted together by an interference fit, Of the two angular ball bearings, in the angular ball bearing on which a reverse axial load acts, which is opposite to the direction in which the angular ball bearing can receive an axial load when the rotating shaft is axially pulled out from the rotating machine device, the hardness of the ball is higher than the hardness of a bearing portion of a raceway that can be separated from the ball. Rotating machinery equipment.

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