WO2016199825A1 - 回転機械 - Google Patents
回転機械 Download PDFInfo
- Publication number
- WO2016199825A1 WO2016199825A1 PCT/JP2016/067121 JP2016067121W WO2016199825A1 WO 2016199825 A1 WO2016199825 A1 WO 2016199825A1 JP 2016067121 W JP2016067121 W JP 2016067121W WO 2016199825 A1 WO2016199825 A1 WO 2016199825A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bearing
- rotating shaft
- collar
- ball bearing
- housing
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
- F16C33/6607—Retaining the grease in or near the bearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
- F04D29/059—Roller bearings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/80—Labyrinth sealings
- F16C33/805—Labyrinth sealings in addition to other sealings, e.g. dirt guards to protect sealings with sealing lips
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
- F16C35/063—Fixing them on the shaft
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
- F02B39/02—Drives of pumps; Varying pump drive gear ratio
- F02B39/08—Non-mechanical drives, e.g. fluid drives having variable gear ratio
- F02B39/10—Non-mechanical drives, e.g. fluid drives having variable gear ratio electric
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
- F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
- F16C19/163—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls with angular contact
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/54—Systems consisting of a plurality of bearings with rolling friction
- F16C19/546—Systems with spaced apart rolling bearings including at least one angular contact bearing
- F16C19/547—Systems with spaced apart rolling bearings including at least one angular contact bearing with two angular contact rolling bearings
- F16C19/548—Systems with spaced apart rolling bearings including at least one angular contact bearing with two angular contact rolling bearings in O-arrangement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/44—Centrifugal pumps
Definitions
- the present disclosure relates to a rotating machine in which a rotating shaft is supported by a bearing.
- Patent Document 1 there is known an electric supercharger in which a compressor wheel is attached to a rotating shaft and a motor rotor fixed to the rotating shaft is rotated by a motor.
- a ring portion that surrounds the rotating shaft, a damper provided inside the ring portion, and a rolling bearing are provided.
- the rolling bearing is attached to the end of the rotating shaft.
- the rolling bearing is a grease-filled bearing in which grease is sealed.
- the bearing may be attached to the rotating shaft by press fitting.
- the bearing When the bearing is press-fitted into the rotating shaft, it is difficult to remove the bearing from the rotating shaft when replacing the bearing. For example, even if an external force is directly applied to the bearing fixed to the rotating shaft, the bearing cannot be easily removed.
- An object of this indication is to provide the rotating machine which can remove a bearing from a rotating shaft easily.
- a rotary machine is a rotary machine including a rotary shaft that is rotatably supported in a housing, and is a bearing that is press-fitted into the rotary shaft and rotatably supports the rotary shaft with respect to the housing. And a flange member attached to the rotary shaft and adjacent to the bearing in the axial direction of the rotary shaft, the collar member being connected to the boss portion and the boss portion passing through the rotary shaft and adjacent to the bearing. And a flange portion extending in the radial direction of the rotation shaft.
- the bearing can be easily removed from the rotating shaft.
- FIG. 1 is a cross-sectional view of a rotating machine according to a first embodiment of the present disclosure.
- FIG. 2 is an enlarged cross-sectional view of a portion A in FIG. 3, (a) is a cross-sectional view showing the collar member in FIG. 2, and (b) is a cross-sectional view showing the collar member in FIG.
- FIG. 4 (a) and (b) are sectional views for explaining a bearing removing step.
- FIG. 5 is an enlarged cross-sectional view illustrating a bearing portion of a rotary machine according to the second embodiment of the present disclosure, and corresponds to FIG. It is sectional drawing which expands and shows the bearing part of the rotary machine which concerns on a comparative example.
- a rotary machine is a rotary machine including a rotary shaft that is rotatably supported in a housing, and is a bearing that is press-fitted into the rotary shaft and rotatably supports the rotary shaft with respect to the housing. And a flange member attached to the rotary shaft and adjacent to the bearing in the axial direction of the rotary shaft, the collar member being connected to the boss portion and the boss portion passing through the rotary shaft and adjacent to the bearing. And a flange portion extending in the radial direction of the rotation shaft.
- the collar member attached to the rotating shaft is adjacent to the bearing in the axial direction.
- the boss portion of the collar member is adjacent to the bearing, and the collar portion extends in the radial direction. Therefore, by applying an axial external force to the collar-like portion, the boss portion is pressed against the bearing, and the bearing press-fitted into the rotating shaft can be easily removed.
- the bearing is a grease-lubricated ball bearing, and a cylindrical portion surrounding the bearing from the outer peripheral side is held inside the housing, and the collar portion of the collar member is Arranged inside.
- the collar portion since the collar portion is arranged inside the cylindrical portion, the clearance between the collar portion and the inner periphery of the cylindrical portion can be reduced. Therefore, the flow of fluid such as air that can pass through the ball bearing is effectively prevented. As a result, grease removal is suppressed, and the life of the bearing is extended and the durability is improved.
- the rotating shaft is provided with a rotating body that protrudes outward in the radial direction from the collar portion, and a gap is provided in the axial direction between the collar portion and the rotating body. It has been.
- a rotating body that projects radially outward is provided on the rotating shaft, the rotating body may become an obstacle when an external force is applied to the collar-shaped portion.
- tool etc. can be arrange
- the bearing is a radial ball bearing including an inner ring press-fitted into a rotating shaft and an outer ring that is rotatable relative to the inner ring via a plurality of balls, and the boss portion is a collar-shaped portion. It protrudes further to the bearing side and abuts against the inner ring, and a gap is provided in the axial direction between the collar-shaped part and the outer ring.
- the boss part since the boss part is in contact with the inner ring of the bearing, it is easy to move the inner ring press-fitted into the rotating shaft relative to the rotating shaft by applying an axial external force to the collar-like part.
- a gap is provided between the collar-shaped portion and the outer ring of the bearing, it is possible to prevent the collar-shaped portion from interfering with the outer ring even when the collar member rotates as the rotating shaft rotates.
- a rotating machine is adjacent to a housing, a rotating shaft housed in the housing, a bearing that supports one side in the axial direction of the rotating shaft, and the other axial side of the bearing.
- a collar member, and the collar member includes a boss portion through which the rotating shaft passes and adjacent to the bearing, and a collar-shaped portion connected to the boss portion and extending in the radial direction of the rotating shaft.
- the electric supercharger (rotary machine) 1 of 1st Embodiment is demonstrated.
- the electric supercharger 1 is applied to, for example, an internal combustion engine of a vehicle or a ship.
- the electric supercharger 1 includes a compressor 7.
- the electric supercharger 1 rotates the compressor impeller 8 by the interaction of the rotor part 13 and the stator part 14, compresses a fluid such as air, and generates compressed air.
- the electric supercharger 1 includes a rotating shaft 12 that is rotatably supported in the housing 2, and a compressor impeller 8 that is fixed to a distal end portion (one end portion) 12 a of the rotating shaft 12.
- the housing 2 includes a motor housing 3 that houses the rotor portion 13 and the stator portion 14, and an end wall 4 that closes an opening on the other end side (right side in the drawing) of the motor housing 3.
- a compressor housing 6 that houses the compressor impeller 8 is provided on one end side (the left side in the drawing) of the motor housing 3.
- the compressor housing 6 includes a suction port 9, a scroll portion 10, and a discharge port 11.
- the compressor impeller 8 is made of, for example, a resin or a carbon fiber reinforced resin (hereinafter referred to as “CFRP”; CFRP: Carbon Fiber Reinforced Plastic), thereby reducing the weight.
- CFRP carbon fiber reinforced resin
- the rotor portion 13 is fixed to the central portion of the rotating shaft 12 in the axial direction D1, and includes one or more permanent magnets (not shown) attached to the rotating shaft 12.
- the stator portion 14 is fixed to the inner surface of the motor housing 3 so as to surround the rotor portion 13, and includes a coil portion (not shown) formed by winding a conductive wire 14a.
- the electric supercharger 1 is provided with two ball bearings (bearings) 20 that are press-fitted into the rotating shaft 12 and rotatably support the rotating shaft 12 with respect to the housing 2.
- the ball bearings 20 are provided in the vicinity of the distal end portion 12a and the proximal end portion 12b of the rotary shaft 12, respectively, and support the rotary shaft 12 by both ends.
- the ball bearing 20 is, for example, a grease lubricated radial ball bearing. More specifically, the ball bearing 20 may be a deep groove ball bearing or an angular ball bearing.
- the ball bearing 20 includes an inner ring 20a press-fitted into the rotary shaft 12, and an outer ring 20b that can rotate relative to the inner ring 20a via a plurality of balls 20c.
- One ball bearing 20 is attached to the back side (right side in the figure) of the compressor impeller 8.
- a cylindrical bearing sleeve (cylindrical portion) 21 is attached to the outer peripheral side of one ball bearing 20.
- the ball bearing 20 and the bearing sleeve 21 are fixed to the rotary shaft 12 by a shaft end nut 16 provided at the tip 12 a of the rotary shaft 12.
- a cylindrical bearing sleeve 21 is disposed on the outer peripheral side of the one ball bearing 20.
- the bearing sleeve 21 is press-fitted into a bearing surrounding portion 23 formed on one end side of the motor housing 3 in the axial direction D1.
- the other ball bearing 20 is attached between the rotary shaft 12 and the end wall 4.
- a cylindrical bearing sleeve (cylindrical portion) 22 is attached to the outer peripheral side of the other ball bearing 20.
- the bearing sleeve 22 is press-fitted into a cylindrical portion (inner peripheral surface) formed so as to protrude into the motor housing 3 at the center of the end wall 4.
- An annular spring receiver 26 is provided between the other ball bearing 20 and the end wall 4. The spring receiver 26 is urged toward one side in the axial direction D1 by a spring 27 disposed in a cylindrical portion at the center of the end wall 4.
- the motor housing 3 is made of aluminum, for example.
- the inner ring 20a and the outer ring 20b of the ball bearing 20 are made of iron. Therefore, bearing sleeves 21 and 22 made of iron such as carbon steel and having the same degree of hardness as the ball bearing 20 are provided between the ball bearing 20 and the motor housing 3. The bearing sleeves 21 and 22 surround the ball bearing 20 from the outer peripheral side. As a result, the motor housing 3 made of a relatively soft material is protected from wear.
- the rotating shaft 12, the compressor impeller 8 fixed to the rotating shaft 12, the rotor portion 13, the ball bearing 20, and the spring receiver 26 constitute a rotating portion integrally in the housing 2, and the axial direction described above It is biased to one side of D1.
- the annular portion 23a of the bearing surrounding portion 23 is opposed to one end side of the ball bearing 20, whereby the rotating portion is positioned in the axial direction D1.
- the rotor portion 13 is a rotating body that protrudes outward in the radial direction D ⁇ b> 2 from the rotating shaft 12.
- the outer diameter of the rotor part 13 is larger than the outer diameter of the outer ring 20b of the ball bearing 20, for example.
- the outer diameter of the rotor portion 13 is, for example, larger than the inner diameter of the bearing sleeve 21 and smaller than the outer diameter of the bearing sleeve 21.
- the outer diameter of the rotor portion 13 may be larger than the outer diameter of the bearing sleeve 21.
- An annular step 12c having a diameter slightly larger than that of the rotating shaft 12 is formed at a position corresponding to one end face in the axial direction D1 of the rotor portion 13 of the rotating shaft 12. That is, the step portion 12 c of the rotating shaft 12 is disposed inside the one end surface of the rotor portion 13 in the axial direction D1.
- a spacer (collar member) 30 is interposed between the ball bearing 20 and the stepped portion 12c.
- the spacer 30 is fixed to the rotating shaft 12 and is adjacent to the ball bearing 20 in the axial direction D1.
- the spacer 30 is made of iron such as carbon steel.
- the spacer 30 includes a cylindrical boss portion 31 that is in contact with the inner ring 20 a of the ball bearing 20 and a collar portion 32 that is connected to the boss portion 31.
- a through hole 30 a through which the rotary shaft 12 passes is provided at the center of the boss portion 31.
- the collar portion 32 extends in the radial direction D2 in an annular shape.
- the boss portion 31 includes an annular boss portion first end surface 31a on one end side in the axial direction D1, and an annular boss portion second end surface 31b on the other end side in the axial direction D1.
- the collar portion 32 includes an annular collar-shaped first end surface 32a on one end side in the axial direction D1, and an annular collar-shaped second end surface 32b on the other end side in the axial direction D1.
- the thickness of the boss part 31 in the axial direction D1, that is, the distance between the boss part first end face 31a and the boss part second end face 31b is the thickness of the collar part 32, that is, the collar part first end face 32a and the collar part. It is larger than the distance between the second end face 32b.
- the boss 31 protrudes further toward the ball bearing 20 than the collar 32. Furthermore, the boss part 31 protrudes to the step part 12 c side from the collar part 32.
- the thickness of the boss part 31 can be determined by, for example, the length (width) of the ball bearing 20 in the axial direction D1.
- the thickness of the collar portion 32 can be determined based on the strength required when a ball bearing 20 described later is removed.
- the boss portion 31 of the spacer 30 is in contact with the inner ring 20 a of the ball bearing 20. Since the boss portion first end surface 31 a protrudes from the collar portion first end surface 32 a, a gap is provided between the collar portion first end surface 32 a and the outer ring 20 b of the ball bearing 20.
- the outer diameter of the collar portion 32 is smaller than the inner diameter of the bearing sleeve 21.
- the bearing sleeve 21 protrudes from the ball bearing 20 to the other side in the axial direction D1.
- a collar portion 32 is disposed inside the protruding portion of the bearing sleeve 21.
- a narrow annular gap g is provided between the inner peripheral surface of the bearing sleeve 21 and the outer peripheral surface of the collar portion 32.
- the spacer 30 is disposed in the bearing sleeve 21 and the clearance g, which is a slight clearance, is formed, so that air passage to the ball bearing 20 is suppressed.
- the rotor portion 13 described above projects outward in the radial direction D2 from the collar portion 32.
- a gap S is provided between the collar-shaped second end surface 32b and the rotor portion 13.
- a spacer 30 is also provided in the same manner between the other ball bearing 20 and the rotor portion 13. Since the configuration of the other ball bearing 20, the bearing sleeve 22, and the spacer 30 is the same as described above, the description thereof is omitted.
- the bearing removing tool 40 includes a cylindrical body 41 in which a semi-cylindrical housing divided into two parts is combined, and a jig 42 provided on an upper part of the cylindrical body 41 and in which semicircular plate portions are combined.
- the rotating shaft 12 is inserted into the upper portion of the cylindrical body 41 and the central portion of the jig 42 in a state where the ball bearing 20 and the spacer 30 are press-fitted into the rotating shaft 12.
- tool 42 is arrange
- the jig 42 can be pressed against the collar portion 32 of the spacer 30 in the axial direction D1.
- the spacer 30 attached to the rotating shaft 12 is adjacent to the ball bearing 20 in the axial direction D1.
- the boss portion 31 of the spacer 30 is adjacent to the ball bearing 20 and the collar portion 32 extends in the radial direction D2. Therefore, by applying an external force in the axial direction D1 to the collar portion 32, the boss portion 31 is pressed against the ball bearing 20, and the ball bearing 20 press-fitted into the rotating shaft 12 can be easily removed.
- the gap g between the collar portion 32 and the inner periphery of the bearing sleeve 21 is small. Therefore, the flow of air that can pass through the ball bearing 20 is hindered. As a result, the removal of grease contained in the ball bearing 20 is further suppressed.
- the jig 42 can be disposed at the interval S provided between the collar portion 32 and the rotor portion 13, and the ball bearing 20 is connected to the shaft via the jig 42. It becomes easier to apply external force in the direction. Therefore, the ball bearing 20 can be easily detached from the rotating shaft 12 even when the rotor portion 13 that projects outward in the radial direction D ⁇ b> 2 is provided on the rotating shaft 12.
- the boss portion 31 since the boss portion 31 is in contact with the inner ring 20a of the ball bearing 20, the inner ring 20a press-fitted into the rotary shaft 12 by applying an external force in the axial direction D1 to the collar portion 32. Is easily moved relative to the rotary shaft 12. Furthermore, since a gap is provided between the collar portion 32 and the outer ring 20b of the ball bearing 20, the collar portion 32 interferes with the outer ring 20b even when the spacer 30 rotates as the rotating shaft 12 rotates. It is prevented.
- the electric supercharger 1 of the second embodiment will be described with reference to FIG. 5 and FIG. 3 (b).
- a spacer 30A having a flat other end surface in the axial direction D1 is used.
- the shape of the spacer is changed because the ball bearing 20A has a size different from that of the ball bearing 20. It is.
- the boss part 31A and the collar part 32A of the spacer 30A are thinner in the axial direction D1 than the boss part 31 and the collar part 32 of the spacer 30.
- the material of the spacer 30 ⁇ / b> A may be changed from the material of the spacer 30 from the viewpoint of securing strength.
- the spacer 30A made of chromium molybdenum steel may be used.
- the collar-shaped second end surface 32b and the collar-shaped second end surface 32b are flush with each other and form a flat surface. Even in this case, an interval S similar to the above is provided between the boss portion 31 ⁇ / b> A and the rotor portion 13.
- the arrangement relationship of the spacer 30 with respect to the bearing sleeve 21 is not limited to the above-described aspect.
- the spacer 30 may be disposed outside the bearing sleeve 21 without the spacer 30 being disposed in the bearing sleeve 21.
- the collar-shaped part 32 may be arrange
- the bearing sleeve 21 may not be provided, and the housing may include a portion having the same shape as the bearing sleeve. That is, as long as the difference in material between the housing and the bearing is solved, the housing and the bearing (the outer ring of the bearing) may be brought into contact without the bearing sleeve.
- ⁇ Bearings are not limited to grease lubricated ball bearings.
- a ball bearing employing another lubrication method oil lubrication or the like
- the bearing is not limited to a radial bearing, and may be a thrust bearing.
- the structure of the present invention can be applied to any rotating machine in which a bearing is press-fitted into a rotating shaft.
- the present invention can be applied to a type of electric supercharger that includes a turbine and assists rotation by a motor, and can also be applied to a general supercharger other than the electric supercharger.
- the present invention is not limited to a rotary machine including a compressor, and the present invention can also be applied to a generator that generates power by a turbine.
- the bearing can be easily removed from the rotating shaft.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Supercharger (AREA)
- Rolling Contact Bearings (AREA)
Abstract
Description
2 ハウジング
7 コンプレッサ
8 コンプレッサインペラ(インペラ)
12 回転軸
13 ロータ部(回転体)
14 ステータ部
20 玉軸受(軸受)
20A 玉軸受(軸受)
20a 内輪
20b 外輪
20c 玉
21 軸受スリーブ(円筒部)
22 軸受スリーブ(円筒部)
23 軸受包囲部
23a 円環部
30 スペーサ(つば部材)
30A スペーサ(つば部材)
31 ボス部
31A ボス部
32 つば状部
32A つば状部
D1 軸方向
D2 径方向
S 間隔
Claims (5)
- ハウジング内で回転可能に支持された回転軸を備える回転機械であって、
前記回転軸に圧入されて、前記ハウジングに対して前記回転軸を回転可能に支持する軸受と、
前記回転軸に取り付けられて、前記回転軸の軸方向において前記軸受に隣接するつば部材と、を備え、
前記つば部材は、前記回転軸が貫通すると共に前記軸受に隣接するボス部と、前記ボス部に連接して前記回転軸の径方向に延在するつば状部とを含む回転機械。 - 前記軸受は、グリース潤滑式の玉軸受であり、
前記ハウジングの内部には、前記軸受を外周側から包囲する円筒部が保持されており、
前記つば部材の前記つば状部は、前記円筒部の内部に配置されている請求項1に記載の回転機械。 - 前記回転軸には、前記つば状部よりも前記径方向の外方に張り出す回転体が設けられており、
前記つば状部と前記回転体との間には、前記軸方向において間隔が設けられている請求項1または2に記載の回転機械。 - 前記軸受は、前記回転軸に圧入された内輪と、複数の玉を介して前記内輪に対して相対回転可能である外輪とを含むラジアル玉軸受であり、
前記ボス部は、前記つば状部よりも前記軸受側に突出して前記内輪に当接しており、
前記つば状部と前記外輪との間には、前記軸方向において隙間が設けられている請求項1~3のいずれか一項に記載の回転機械。 - ハウジングと、
前記ハウジング内に収容された回転軸と、
前記回転軸の軸方向の一方側を軸支する軸受と、
前記軸受の前記軸方向の他方側に隣接するつば部材と、を備え、
前記つば部材は、
前記回転軸が貫通すると共に前記軸受に隣接するボス部と、
前記ボス部に連接して前記回転軸の径方向に延在するつば状部と、
を含む回転機械。
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JP2004150372A (ja) * | 2002-10-31 | 2004-05-27 | Shimadzu Corp | 高速回転機器 |
JP2004278643A (ja) * | 2003-03-14 | 2004-10-07 | Nsk Ltd | プランジャポンプ用クランクユニット |
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KR20120014901A (ko) | 2009-04-20 | 2012-02-20 | 보르그워너 인코퍼레이티드 | 롤링 요소 베어링 카트리지를 위한 절연 및 감쇠 슬리브 |
JP5529714B2 (ja) | 2010-11-12 | 2014-06-25 | 三菱重工業株式会社 | 電動過給機の回転軸支持構造 |
JP5535992B2 (ja) * | 2011-07-15 | 2014-07-02 | 三菱重工業株式会社 | 電動過給圧縮機、その組立方法及び内燃機関 |
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