JP5633261B2 - Turbocharger with lubricating oil supply device - Google Patents

Description

The present invention relates to a lubricating oil supply device turbocharger mounted on a vehicle such as an automobile.

  An example of the angular type rolling bearing 100 is shown in FIG. This includes a substantially cylindrical outer ring 101, a substantially cylindrical inner ring 102 disposed on the inner peripheral side of the outer ring 101, a plurality of rolling elements 103 that roll between the outer ring 101 and the inner ring 102, and between the outer ring 101 and the inner ring 102. A plurality of pockets 104a are formed in the holder 104, and a rolling element 103 is held in each pocket 104a.

  When this rolling bearing 100 is applied to the turbocharger shown in Patent Document 1, oil bearings (not shown) are provided on both sides in the axial direction of the rolling 100, and the rolling bearing 100 is cooled by the lubricating oil in the oil pool. It has become. Further, the inner ring 102, the rolling element 103, and the cage 104 rotate, and the lubricating oil in the oil pool is swept up, and the other outer ring 101, the inner ring 102, the rolling element 103, and the cage 104 that are not immersed in the lubricating oil are lubricated. , The rolling bearing 100 was cooled. FIG. 6 is a front view of the cage 104 as viewed from the radial direction, and both side surfaces in the axial direction of the cage 104 have flat surfaces 104b.

JP 2010-96119 A

  When the turbocharger is fully operated on a long uphill road and the engine is stopped, the lubricating oil from the lubricating oil supply device driven by the engine will not be supplied, but the rotating shaft of the turbocharger rotates with inertia for a while. To do. The heat on the turbine side of the turbocharger is transmitted to the rolling bearing 100 via the rotating shaft of the turbocharger or the turbocharger housing of the turbocharger. Both side surfaces of the cage 104 in the axial direction have flat surfaces 104b, and when the cage 104 rotates, there is a possibility that the rolling bearing 100 will be seized because the ability to scoop up the lubricating oil in the oil sump is insufficient. It was.

The invention according to claim 1 is a turbine-side impeller that is rotationally driven by engine exhaust gas, a compressor-side impeller that sends compressed air to the intake side of the engine, and a rotating shaft that connects the turbine-side impeller and the compressor-side impeller. A pair of rolling bearings that rotatably support the rotating shaft, a bearing case that houses the pair of rolling bearings, a turbocharger housing that houses the turbine side impeller, the compressor side impeller, and the bearing case, and lubricates the rolling bearing An oil supply device for supplying oil, oil reservoirs are provided on both axial sides of the rolling bearing on the turbine side impeller side, and a supply passage leading to the oil reservoir and a discharge passage leading to the oil reservoir are provided in the turbocharger housing In the turbocharger with a lubricating oil supply device provided in the turbine side, The invention according to claim 3 is a turbine-side impeller that is rotationally driven by engine exhaust gas, a compressor-side impeller that sends compressed air to the intake side of the engine, a turbine-side impeller, and a compressor-side impeller. A rotating shaft that connects the rotating shaft, a pair of rolling bearings that rotatably support the rotating shaft, a bearing case that houses the pair of rolling bearings, a turbine side impeller, a compressor side impeller, and a turbocharger housing that houses the bearing case, A lubricating oil supply device that supplies lubricating oil to the rolling bearing, and has oil reservoirs on both axial sides of the rolling bearing on the turbine side impeller side, a supply passage that leads to the oil reservoir, and a discharge passage that leads to the oil reservoir A turbocharger with a lubricating oil supply device provided in the turbocharger housing There are, the turbine-side impeller side of the rolling bearing includes a cylindrical outer ring, and a cylindrical inner ring which is disposed on the inner peripheral side of the outer ring, a plurality of rolling elements that roll between the outer ring and the inner ring, the It has a pocket for holding a plurality of rolling elements, and is composed of a cylindrical cage disposed between the outer ring and the inner ring, and has a concave groove having a depth in the axial direction on both sides in the axial direction of the cage. The oil sump has a depth that allows a portion of the cage to be covered with the lubricating oil, and the lubricating oil is lifted up by the concave groove during rotation of the cage. is there.

  According to this configuration, the lubricating oil can be stored by the concave groove. In addition, the groove improves the ability to lift the lubricating oil, allowing the outer oil, inner ring, rolling elements, and cage not to be immersed in the lubricating oil to be applied to the lubricating oil, absorbing heat from the turbine and rolling. The seizure of the bearing can be prevented.

According to the present invention, lubricating oil can be stored by the recessed groove. In addition, the groove improves the ability to lift the lubricating oil, allowing the outer oil, inner ring, rolling elements, and cage not to be immersed in the lubricating oil to be applied to the lubricating oil, absorbing heat from the turbine and rolling. The seizure of the bearing can be prevented.

Sectional drawing of the turbocharger in embodiment of this invention 1 is an enlarged cross-sectional view of FIG. 1 in an embodiment of the present invention. The front view of the holder | retainer in embodiment of this invention Side view of cage in embodiment of the present invention Cross section of a conventional rolling bearing Front view of conventional cage

  An embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is a cross-sectional view of the turbocharger, FIG. 2 is an enlarged cross-sectional view of FIG. 1, FIG. 3 is a front view of the cage, and FIG. 4 is a side view of the cage.

  In FIG. 1, a portion surrounded by a one-dot chain line is a lubricating oil supply device 10. The lubricating oil supply device 10 includes a lubricating oil supply pump 11 that is rotationally driven by an unillustrated engine crankshaft, an oil pan 12 that stores the lubricating oil, a strainer 13 that filters the lubricating oil pumped up from the oil pan 12, An oil element 15 is provided for filtering the lubricant before supplying the lubricant to the various places 14. The lubricating oil supply device 10 serves to lubricate the various places 14 (for example, between the cylinder and the piston) by supplying the lubricating oil to the various places 14 of the engine.

  The turbocharger 20 is externally attached to the engine, and the turbocharger 20 is compressed into the engine by rotating the turbine-side impeller 21 and the compressor-side impeller 22 integrally with the exhaust gas discharged from the engine. It is a device that supplies air.

  The turbocharger 20 has a rotating shaft 23, a turbine side impeller 21 is integrally formed at one end of the rotating shaft 23, and a compressor side impeller 22 is attached to the other end of the rotating shaft 23. The rotating shaft 23 is rotatably supported by a pair of rolling bearings (angular ball bearings) 24, 25. The rolling bearing 24 is press-fitted and fixed to one end of a substantially cylindrical bearing case 26. The rolling bearing 25 is a bearing case. 26 is loosely fitted to the other end.

  The rotary shaft 23 is formed with a first step portion 23a, a medium diameter portion 23b, a second step portion 23c, a small diameter portion 23d, and a screw portion 23e in this order. A rolling bearing 24 and a rolling bearing 25 are fitted to the middle diameter portion 23b in this order, a thrust receiving member 28 and a compressor side impeller 22 are fitted to the small diameter portion 23d in this order, and a nut 29 is fitted to the screw portion 23e. Is screwed. The rolling bearing 24 and the rolling bearing 25 are sandwiched in the axial direction between the first step portion 23 a and the thrust receiving member 28, and the thrust receiving member 28 and the compressor side impeller 22 are sandwiched between the second step portion 23 c and the nut 29. It is sandwiched in the axial direction.

  On the outer peripheral surface of the bearing case 26, a first small diameter portion 26a, a first large diameter portion 26b, a wide annular groove 26c, a second large diameter portion 26d, and a second small diameter portion 26e are formed in this order. . Narrow annular grooves 26f and 26g are formed in the first large-diameter portion 26b and the second large-diameter portion 26d, respectively.

  A first large diameter portion 26h, a first step portion 26j, a small diameter portion 26k, a second step portion 26m, and a second large diameter portion 26n are formed on the inner peripheral surface of the bearing case 26 in this order. . The first spacer 30 is loosely fitted to the first large diameter portion 26h, and the outer ring of the rolling bearing 24 is press-fitted and fixed to the first large diameter portion 26h. The second spacer 31 is loosely fitted to the second large diameter portion 26n, and the outer ring of the rolling bearing 25 is loosely fitted to the second large diameter portion 26n.

  A coil spring 32 is inserted between the first spacer 30 and the second spacer 31, and a constant pressure preload is applied to the rolling bearings 24 and 25 by the coil spring 32. A narrow annular groove 30 a having a triangular cross section is formed on the outer peripheral surface of the first spacer 30. The first spacer 30 is formed with a nozzle hole 30b. One end of the nozzle hole 30b opens into the narrow annular groove 30a, and the other end of the nozzle hole 30b faces the inner ring of the rolling bearing 24. An insertion hole 30 c for loosely fitting the rotating shaft 23 is formed on the inner periphery of the first spacer 30.

  A pass hole 26p is formed in the bearing case 26. One end of the pass hole 26p opens into the narrow annular groove 26f, and the other end of the pass hole 26p opens toward the narrow annular groove 30a.

  As shown in FIG. 1, the turbocharger 20 has a turbocharger housing 50, and the turbocharger housing 50 houses a turbine housing (not shown) that houses the turbine side impeller 21, a center housing 52, and the compressor side impeller 22. The compressor housing is not shown.

  The center housing 52 is formed with a holding hole 52a, a first stepped hole 52b, and a second stepped hole 52c in this order. The bearing case 26 is loosely fitted in the holding hole 52a, the thrust plate 53 is fitted in the first stepped hole 52b, and the seal plate 54 is fitted in the second stepped hole 52c. The thrust receiving member 28 is slidably fitted to the inner peripheral surface of the thrust plate 53 and the inner peripheral surface of the seal plate 54, and the inner peripheral surface of the thrust plate 53, the inner peripheral surface of the seal plate 54, and the thrust receiving member 28. The thrust force can be received by the tapered surface formed on the outer peripheral surface of the steel plate.

  The center housing 52 is formed with an introduction port 52d, a horizontal hole 52e, and vertical holes 52f and 52g. The lubricating oil from the lubricating oil supply pump 11 is a narrow ring of the introduction port 52d, the horizontal hole 52e, the vertical hole 52f, and the bearing case 26. It is guided to the rolling bearing 24 through the groove 26f, the pass hole 26p, the narrow annular groove 30a of the first spacer 30, and the nozzle hole 30b. Further, the lubricating oil from the lubricating oil supply pump 11 is guided to the introduction port 52d, the horizontal hole 52e, the vertical hole 52g, and the narrow annular groove 26g of the bearing case 26. The lubricating oil guided to the narrow annular groove 26 f is guided to the end surface of the bearing case 26 on the turbine side impeller 21 side via the first small diameter portion 26 a of the bearing case 26. The lubricating oil guided to the narrow annular groove 26g is guided to the end surface of the bearing case 26 on the compressor side impeller 22 side through the second small diameter portion 26e of the bearing case 26. A part of the lubricating oil guided to the narrow annular grooves 26 f and 26 g is guided to the wide annular groove 26 c of the bearing case 26.

  The center housing 52 is formed with a first discharge passage 52h, a second discharge passage 52j, a third discharge passage 52k, and a discharge port 52m, which are led to the end surface of the bearing case 26 on the turbine side impeller 21 side. The lubricating oil is discharged to the discharge port 52m through the first discharge passage 52h. The lubricating oil introduced to the end surface of the bearing case 26 on the compressor side impeller 22 side is discharged to the discharge port 52m through the third discharge passage 52k. The lubricating oil guided to the wide annular groove 26c of the bearing case 26 is discharged to the discharge port 52m through the second discharge passage 52j.

  The center housing 52 is formed with a communication hole 52n that communicates the first discharge passage 52h and the holding hole 52a. The communication hole 52n is provided coaxially with the rotary shaft 23.

  Oil reservoirs 60 and 61 are formed on both axial sides of the rolling bearing 24. The oil sump 60 is a space defined by the holding hole 52 a of the center housing 52, the first large diameter portion 26 h of the bearing case 26, and the outer peripheral surface of the rotating shaft 23, and the oil sump 61 is the first spacer 30. This is a space defined by the inner peripheral surface of the rotating shaft 23 and the outer peripheral surface of the rotating shaft 23.

  The rolling bearing 24 includes a substantially cylindrical outer ring 24a, a substantially cylindrical inner ring 24b disposed on the inner peripheral side of the outer ring 24a, a plurality of rolling elements 24c that roll between the outer ring 24a and the inner ring 24b, and a plurality of rolling elements 24c. And a cylindrical retainer 65 disposed between the outer ring 24a and the inner ring 24b. As shown in FIGS. 3 to 4, concave grooves 65 b penetrating in the radial direction are formed on both side surfaces of the cage 65 in the axial direction. In addition, the concave grooves 65b are formed at positions corresponding to every other pocket 65a in the circumferential direction. The width of the concave groove 65b is larger than the diameter of the pocket 65a.

The oil reservoir 60 and the oil reservoir 61 communicate with each other through a space between the outer ring 24a and the inner ring 24b of the rolling bearing 24. Insertion holes 30c of the communication hole 52n and the first spacer 30 of the center housing 52 is formed coaxially with the rotary shaft 23, towards the communication hole 52n is greater diameter than the insertion hole 30c. Therefore, the lubricating oil in the oil reservoirs 60 and 61 is accumulated up to the lowest point of the communication hole 52n .

Next, the operation of this embodiment will be described based on the configuration of the above-described embodiment.
While the engine is being driven, the turbine-side impeller 21 is rotated by the exhaust gas discharged from the engine. The rotation of the turbine-side impeller 21 is transmitted to the compressor-side impeller 22 via the rotating shaft 23, and compressed air is supplied from the compressor-side impeller 22 to the engine.

  By driving the engine, the lubricating oil supply pump 11 is also driven, and the lubricating oil pumped up from the oil pan 12 is fed to various parts 14 of the engine via the strainer 13, the lubricating oil supply pump 11, and the oil element 15. Also supplied to the rolling bearings 24 and 25 of the turbocharger 20.

  When the engine is stopped, the lubricating oil supply pump 11 is stopped and the lubricating oil is not supplied to the rolling bearings 24 and 25. The rotating shaft 23 of the turbocharger 20 rotates for a while due to inertia. At this time, the inner ring 24b, the retainer 65, and the rolling element 24c are rotated, and the lubricating oil in the oil reservoirs 60 and 61 is lifted up, and the outer ring 24a, the inner ring 24b, and the retainer 65 that are not in contact with the oil reservoirs 60 and 61 are collected. The lubricating oil is applied to the rolling elements 24c. Since the concave grooves 65b are formed in the radial direction on both side surfaces of the cage 65 in the axial direction, the ability to scoop up the lubricating oil in the oil reservoirs 60 and 61 is enhanced by the concave grooves 65b.

The present invention is not limited to these embodiments, and can of course be implemented in various modes without departing from the gist of the present invention.
As another embodiment, instead of the angular ball bearing type rolling bearings 24 and 25, the present invention may be applied to a radial ball bearing type rolling bearing.

  DESCRIPTION OF SYMBOLS 10: Lubricating oil supply apparatus, 20: Turbocharger, 21: Turbine side impeller, 22: Compressor side impeller, 23: Rotating shaft, 24: Rolling bearing, 24a: Outer ring, 24b: Inner ring, 24c rolling element, 60: Oil sump 61: Oil sump, 65: Cage, 65a: Pocket, 65b: Concave groove

Claims (1)

A turbine-side impeller that is rotationally driven by engine exhaust gas, a compressor-side impeller that sends compressed air to the intake side of the engine, a rotary shaft that connects the turbine-side impeller and the compressor-side impeller, and a rotary shaft that is rotatably supported A pair of rolling bearings, a bearing case that houses the pair of rolling bearings, a turbine side impeller, a compressor side impeller, a turbocharger housing that houses the bearing case, and a lubricating oil supply device that supplies lubricating oil to the rolling bearing A turbocharger with a lubricating oil supply device in which an oil sump is provided on both axial sides of the rolling bearing on the turbine side impeller side, a supply passage leading to the oil sump, and a discharge passage leading to the oil sump are provided in the turbocharger housing In the charger
The turbine-side impeller-side rolling bearing includes a cylindrical outer ring, a cylindrical inner ring disposed on an inner peripheral side of the outer ring, a plurality of rolling elements that roll between the outer ring and the inner ring, and the plurality of rolling elements. rolling element has a pocket that holds, consists of a cylindrical cage arranged between the outer ring and the inner ring, the groove having a depth in the axial direction side surfaces in the axial direction of the cage in the radial direction And the oil sump has a depth to which a part of the cage is covered with the lubricating oil, and the lubricating oil is swept up by the concave groove during the rotation of the cage. Turbocharger with feeding device.

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