JP2008088996A - Tapered roller bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tapered roller bearing capable of smoothly lubricating a sliding part of a large flange part of an inner ring and a large-diameter end surface of a tapered roller, and capable of rapidly reducing torque. <P>SOLUTION: An outer circumference surface of the large flange part 10 of the inner ring 2 has a conical shape with an outer diameter getting smaller toward an inner side of the inner ring 2 in an axial direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tapered roller bearing device. The present invention is particularly suitable for a tapered roller bearing that can be used to rotatably support the pinion shaft of a vehicle pinion shaft support device having a pinion shaft such as a differential gear device, a transaxle device, or a transfer device. Relates to the device.

  Conventionally, as a tapered roller bearing device, there is one described in Japanese Patent Laid-Open No. 11-48805 (Patent Document 1). This tapered roller bearing device has an inner ring, an outer ring, and a tapered roller. The inner ring has a large collar portion in contact with the large-diameter end surface of the tapered roller on the large-diameter side of the conical raceway surface. The inner peripheral surface of the inner ring is fixed to a pinion shaft of the differential gear device, while the outer peripheral surface of the outer ring is fixed to an annular partition wall in the differential gear device.

  In the tapered roller bearing device, the oil flowing from the ring gear of the differential gear device through the oil passage is passed between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring on the small diameter side of the conical raceway surface of the inner ring. The outer ring, the inner ring and the tapered roller are prevented from seizing by flowing from the opening to the opening on the large diameter side of the conical raceway surface of the inner ring.

  In such a background, in the oil lubricated tapered roller bearing device as described above, there is a demand for greatly reducing the agitation resistance of the oil and greatly reducing the torque. However, if the amount of oil flowing in the tapered roller bearing device is limited to a very small amount in order to greatly reduce the oil agitation resistance, which is the main factor of torque, for the purpose of greatly reducing torque, Oil may not sufficiently spread to the sliding portion between the collar portion and the large-diameter end surface of the tapered roller, and the sliding portion may be difficult to lubricate.

On the other hand, if a sufficient amount of oil to lubricate the sliding part without problems is supplied into the tapered roller bearing device, the torque resulting from the oil stirring resistance increases and a significant reduction in torque can be achieved. Disappear.
Japanese Patent Laid-Open No. 11-48805 (FIG. 1)

  Accordingly, an object of the present invention is to provide a tapered roller bearing device capable of lubricating the sliding portion between the large collar portion of the inner ring and the large-diameter end surface of the tapered roller without any problem and capable of greatly reducing the torque. is there.

In order to solve the above problems, the tapered roller bearing device of the present invention is
An outer ring having a conical raceway surface;
An inner ring having a conical raceway surface;
A tapered roller disposed between the conical raceway surface of the outer ring and the conical raceway surface of the inner ring,
The inner ring has a large flange on the large diameter side of the conical raceway surface in the inner ring,
The large collar portion has a guide surface that slides with respect to the large-diameter end surface of the tapered roller, and an outer peripheral surface portion that decreases in outer diameter as it goes inward in the axial direction of the inner ring. It is a feature.

  The present inventors have found that in a tapered roller bearing device having a large collar portion on the inner ring, most seizures occur at the sliding portions of the large collar portion of the inner ring and the large diameter end surface of the tapered roller. . In other words, the present inventor has found that if the seizure of the large collar portion of the inner ring and the large diameter end surface of the tapered roller can be prevented, seizure of the entire tapered roller bearing device can be prevented.

  According to the present invention, the large collar portion has the outer peripheral surface portion whose outer diameter decreases as it goes inward in the axial direction of the inner ring, so only oil (lubricating oil) is supplied to the outer peripheral surface portion. Thus, the oil can be automatically guided to the guide surface through the outer peripheral surface portion. Therefore, it is possible to effectively lubricate the large collar portion of the inner ring and the large-diameter end surface of the tapered roller that slide with each other, and the guide caused by the sliding contact between the guide surface and the large-diameter end surface of the tapered roller. The seizure between the surface and the large-diameter end surface can be reliably prevented.

  Further, according to the present invention, since the seizure of the entire tapered roller bearing device can be prevented only by supplying oil to the outer peripheral surface portion, the amount of oil in the tapered roller bearing device is greatly increased compared to the conventional case. Can be reduced. Therefore, the torque of the tapered roller bearing device can be greatly reduced, and the fuel consumption of an automobile or the like having this tapered roller bearing device can be significantly reduced.

  Moreover, the tapered roller bearing device of one embodiment includes an oil supply device that supplies oil to the outer peripheral surface portion.

  According to the embodiment, since the oil supply device that supplies oil to the outer peripheral surface portion is provided, the oil can be directly supplied to the outer peripheral surface portion, and seizure of the guide surface and the large-diameter end surface is ensured. Can be prevented. Further, by using only the oil supply device as the device for supplying oil into the tapered roller bearing device, the stirring resistance of the tapered roller bearing device can be greatly reduced.

  According to the tapered roller bearing device of the present invention, the large collar portion of the inner ring has the outer peripheral surface portion whose outer diameter decreases as it goes inward in the axial direction of the inner ring. By simply supplying the oil, the oil can be automatically guided through the outer peripheral surface portion to the guide surface with the tapered roller in the large collar portion. Therefore, it is possible to effectively lubricate the large collar portion of the inner ring that slides relative to the large diameter end surface of the tapered roller, and to reliably prevent seizure of the guide surface and the large diameter end surface of the tapered roller. it can.

  Further, according to the tapered roller bearing device of the present invention, it is possible to prevent seizure of the entire tapered roller bearing device simply by supplying oil to the outer peripheral surface portion, so that the amount of oil in the tapered roller bearing device is markedly reduced. The torque of the tapered roller bearing device can be greatly reduced, and the fuel consumption of an automobile or the like having this tapered roller bearing device can be significantly reduced.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view in the axial direction of a tapered roller bearing device according to an embodiment of the present invention.

  This tapered roller bearing device rotatably supports a pinion shaft of a differential gear device (not shown). The tapered roller bearing device includes an outer ring 1, an inner ring 2, a tapered roller 3, and an oil supply device 4.

  The outer ring 1 has a conical raceway surface on the inner peripheral side, and the outer peripheral surface of the outer ring 1 is fitted and fixed in a housing 7 of a differential gear device. On the other hand, the inner ring 2 has a conical raceway surface on the outer peripheral side, and the inner peripheral surface of the inner ring 2 is externally fitted and fixed to a pinion shaft (not shown) of the differential gear device. The inner ring 2 has a small end portion 9 on the small diameter side of the conical raceway surface and a large collar portion 10 on the large diameter side of the conical raceway surface. The large collar portion 10 includes a guide surface 14 and an outer peripheral surface. It has the outer peripheral conical surface 15 as a part. The guide surface 14 is slidably guided with respect to the large-diameter end surface 11 of the tapered roller 3. Further, the outer peripheral conical surface 15 has an outer diameter that becomes smaller inward in the axial direction of the inner ring 2, and the radial direction of the guide surface 14 from the axial end of the inner ring 1 (excluding the chamfered portion). It extends in the axial direction up to the outer end 18. A plurality of the tapered rollers 3 are disposed between the conical raceway surface of the outer ring 1 and the conical raceway surface of the inner ring 2 with a predetermined interval in the circumferential direction while being held by a retainer (not shown). ing.

  The oil supply device 4 sprays oil having a viscosity suitable for preventing seizure of the rolling bearing onto the outer peripheral conical surface 15. The oil supply device 4 includes a sprayer (not shown) that generates oil mist, an open / close valve (not shown), an oil line (not shown), and an oil supply passage (not shown) formed in the housing 7. And an oil dripping portion 20 connected to the oil supply passage.

  One end of the oil line is connected to the discharge port of the sprayer via an opening / closing valve, and the opening / closing valve introduces oil mist into the oil line or introduces oil mist into the oil line by opening / closing the opening / closing valve. Is prohibited.

  The other end of the oil line is connected to the oil supply passage. The oil supply passage communicates the outside of the differential gear device and the inside of the differential gear device. The oil dripping unit 20 has a nozzle 22 that is a mist condenser, and an injection port of the nozzle 22 is directed to the outer circumferential conical surface 15.

  The oil supply device 4 guides the oil mist generated by the sprayer to the oil dropping unit 20 via the oil line and the oil supply passage. The oil mist guided to the oil dripping unit 20 is condensed by the nozzle 22 of the oil dripping unit 20, and oil droplets of oil are supplied from the nozzle 22 to the outer peripheral conical surface 15. The oil supply device 4 supplies a very small amount of oil to the outer peripheral conical surface 15 at predetermined intervals by opening and closing the opening / closing valve.

  Although not described in detail, in this differential gear device, the internal partition wall of the housing, which is the internal structure of the housing, is configured so that the gear oil that prevents seizure of the gear of the differential gear device and the like from the openings on both sides of the tapered roller bearing device. It has a shape that can prevent intrusion. That is, in this differential gear device, gear oil in the differential gear device hardly enters the tapered roller bearing device. For this reason, only the oil from the oil supply device 4 is supplied to the tapered roller bearing device.

  In the above configuration, when oil is supplied from the oil supply device 4 to the outer peripheral conical surface 15, the outer peripheral conical surface 15 has an outer diameter that decreases inward in the axial direction of the inner ring 2. The oil supplied to the surface 15 moves to the guide surface 14 of the large collar portion 10 along the outer circumferential conical surface 15 inward in the axial direction. Unlike the tapered surface formed when chamfering, the outer peripheral conical surface 15 as the outer peripheral surface portion has a function of guiding and guiding oil to the large-diameter end surface 11 of the tapered roller 3 and the guide surface 14 of the large collar 10. ing.

  When the outer peripheral surface portion (not necessarily formed on the entire outer peripheral surface of the large collar portion (excluding the chamfered portion) as in this embodiment) is a conical surface shape as in this embodiment, In an axial cross section, when an inclination angle defined by an angle (an angle smaller than 90 °) formed by the outer peripheral surface portion with the central axis of the tapered roller bearing device is set to 10 ° or more, the outer peripheral conical surface is supplied. It is preferable that the oil can be smoothly guided to the guide surface of the large collar.

  The present inventor supplies various types of oil in various amounts from various locations in a large number of tapered roller bearing devices having different manufacturing materials, shapes, etc. An experiment was conducted to investigate the size from various angles. As a result, it was discovered that most seizure occurred in the sliding portion between the large-diameter end face of the tapered roller and the large collar portion of the inner ring. In addition, in most cases, the tapered roller can be provided by supplying sufficient oil to the sliding portion between the large-diameter end face of the tapered roller and the large collar portion of the inner ring to prevent seizure of the sliding portion. It has been found that sufficient oil can be supplied to the sliding portions other than the sliding portion such as the raceway surface by rotating and revolving, rotating the rotating wheel, and the like, and seizure does not occur in the entire tapered roller bearing device.

  Further, when oil is supplied to the tapered roller bearing device from the small diameter side opening of the conical raceway surface of the inner ring of the tapered roller bearing device, the sliding portion between the large diameter end surface of the tapered roller and the large collar portion of the inner ring is seized. In order to prevent this problem, it was found that a large amount of oil was required and the torque was increased in comparison with many sample tapered roller bearing devices used in the test. This is because when oil is supplied from the opening on the small diameter side of the conical raceway surface of the inner ring, the oil flowing in the tapered roller bearing device tends to flow outward in the radial direction due to the centrifugal force accompanying the rotation of the inner ring. This is presumably because the oil does not easily reach the sliding portion between the large collar portion of the inner ring located on the radially inner side and the large diameter end surface of the tapered roller.

  In addition, when oil is supplied to the tapered roller bearing device from the opening on the large diameter side of the conical raceway surface of the inner ring of the tapered roller bearing device, a small amount of the tapered roller bearing device used in the test is compared with the tapered roller bearing device. It was discovered that the oil supply can prevent seizure of the sliding portion between the large-diameter end face of the tapered roller and the large collar portion of the inner ring, and seizure does not occur in the entire tapered roller bearing device. Further, when oil is supplied to the tapered roller bearing device (excluding the oil supply device) of the above-described embodiment from the opening on the large diameter side of the conical raceway surface of the inner ring of the tapered roller bearing device, the conventional tapered roller bearing device ( Oil is supplied from the small diameter opening of the conical raceway surface of the inner ring of the tapered roller bearing device to the bearing device in which the outer peripheral surface of the large collar portion of the inner ring is substantially parallel to the central axis of the bearing device in the axial section. Compared to the case, it was confirmed that the amount of oil could be reduced to less than half and the torque could be greatly reduced.

  According to the tapered roller bearing device of the above embodiment, the large collar portion 10 has the outer peripheral conical surface 15 whose outer diameter decreases as it goes inward in the axial direction of the inner ring 2. The oil can be automatically and smoothly guided to the guide surface 14 through the outer peripheral conical surface 15 simply by supplying the oil to. Therefore, the large collar portion 10 of the inner ring 2 that slides relative to each other and the large-diameter end surface 11 of the tapered roller 3 can be effectively lubricated, and the guide surface 14 and the large-diameter end surface 11 of the tapered roller 3 are seized. Thus, seizure of the entire tapered roller bearing device can be reliably prevented.

  Further, according to the tapered roller bearing device of the above embodiment, the oil is supplied between the large-diameter end surface 11 of the tapered roller and the large collar portion 10 through the outer peripheral conical surface 15. Thus, the heat of the outer peripheral conical surface 15 can be absorbed. Therefore, since the heat dissipation of the large collar portion 10 is remarkably improved, seizure of the guide surface 14 and the large diameter end surface 11 of the tapered roller 3 can be further reliably prevented.

  Further, according to the tapered roller bearing device of the above embodiment, since oil is supplied only to the outer peripheral conical surface 15, the amount of oil in the tapered roller bearing device can be limited to a very small amount. The torque of the bearing device can be greatly reduced. Therefore, the fuel consumption of an automobile or the like having this tapered roller bearing device can be significantly reduced.

  Further, according to the tapered roller bearing device of the above embodiment, since the oil supply device 4 that supplies oil toward the outer peripheral conical surface 15 is provided, the oil can be supplied to the outer peripheral conical surface 15, and the guide surface 14 and The seizure of the large diameter end surface 11 can be reliably prevented.

  Further, according to the tapered roller bearing device of the above embodiment, the oil supply device 4 is the only device that supplies oil into the tapered roller bearing device, so that the stirring resistance of the tapered roller bearing device can be greatly reduced. And the torque can be greatly reduced.

  In the tapered roller bearing device of the above embodiment, the outer peripheral conical surface 15 extends in the axial direction from one axial end of the inner ring 1 (excluding the chamfered portion) to the radially outer end 18 of the substantially guide surface 14. However, according to the present invention, the outer peripheral conical surface has one end in the axial direction of the inner ring 1 (excluding the chamfered portion) as long as it extends to the radially outer end of the guide surface of the substantially large collar portion. It does not have to extend from. That is, the outer peripheral surface portion whose outer diameter decreases as it goes inward in the axial direction of the inner ring does not have to be formed on the entire outer peripheral surface of the large collar portion. It only has to be formed on a part of the side.

  Further, in the tapered roller bearing device of the above embodiment, the outer peripheral surface portion whose outer diameter decreases as it goes inward in the axial direction of the inner ring has a conical shape. Any shape may be used as long as the outer diameter decreases in a taper shape as it goes inward in the axial direction. For example, the shape of the outer peripheral surface portion may be various curved surfaces such as a shape of a part of a parabola convex outward in the radial direction, a shape of a part of a circle, a part of a hyperbola in an axial section, A combination of these or a combination of a curved surface and a conical surface may be used.

  Further, in the tapered roller bearing device of the above embodiment, a very small amount of oil is supplied from the oil supply device 4 to the outer peripheral conical surface 15 at predetermined intervals. A trace amount of oil may be continuously supplied to the outer peripheral surface portion. In the present invention, the oil supply device may receive a signal indicating the temperature from a temperature sensor that measures the temperature of the tapered roller bearing device or the temperature around the tapered roller bearing device. However, oil may be supplied to the outer peripheral surface only when a signal indicating that the temperature measured by the temperature sensor is equal to or higher than a predetermined temperature is received from the temperature sensor.

  Further, in the tapered roller bearing of the above embodiment, the oil supply device 4 sprayed the outer peripheral conical surface 15 (mist lubrication). However, in the present invention, the oil supply device includes a reciprocating pump driven by a compressed air and having a small flow rate discharge, a mixing bubble for mixing minute oil and compressed air, and an oil / air pipe for guiding the mixed minute oil and compressed air. And a nozzle that injects the mixed fine oil and compressed air, and may be configured to supply oil air (oil-air lubrication or air-oil lubrication). The oil supply device may have a structure in which no nozzle is present, or may have a structure in which oil is directly dropped from one opening of an oil supply passage formed in an outer ring fixing member to which an outer ring is fixed. good. The oil supply device may have a structure in which oil droplets are freely dropped from an oil reservoir and supplied to the outer peripheral surface portion. The oil supply device may have any structure as long as it can supply oil to the outer peripheral surface portion. In these cases, the oil is preferably supplied at a rate of about several ml / min.

  Further, in the tapered roller bearing device of the above embodiment, the oil is supplied only to the outer peripheral conical surface 15 of the large collar portion 10, but in the present invention, the oil is supplied to the outer peripheral surface portion of the large collar portion. While being supplied, you may come to be supplied to parts other than the outer peripheral surface part of a large collar part.

  Further, the tapered roller bearing device of the above embodiment has the oil supply device 4, but the tapered roller bearing device of the present invention may not have the oil supply device. Even if there is no oil supply device, for example, when the tapered roller bearing device is installed on the pinion shaft of the vehicle pinion shaft support device, the housing of the vehicle pinion shaft support device having the pinion shaft is provided. By appropriately forming the internal partition wall of the housing, which is an internal structure, the gear oil in the vehicle pinion shaft support device (for example, a differential gear device) is used as the outer peripheral surface of the large collar portion of the tapered roller bearing device of the present invention. It is because it can supply to a part.

  FIG. 2 is a schematic cross-sectional view of a tapered roller bearing device according to another embodiment of the present invention.

  In FIG. 2, reference numeral 140 indicates a cage. The retainer 140 has a conical main body 141 and a radially extending portion 142. The main body 141 has a pocket for accommodating the tapered rollers 103. In addition, the radially extending portion 142 is connected to the end on the smaller inner diameter side of the main body portion 141, bent inward in the radial direction, and extends substantially in the radial direction.

  In this tapered roller bearing device, oil is directly supplied from one opening of an oil supply passage 104 formed in a housing 107 which is an outer ring fixing member to which an outer ring 101 is fixed in a direction indicated by an arrow a. The outer peripheral conical surface 115 of the part 110 is configured to be dropped inward in the radial direction of the outer ring 101.

  With such a structure, the oil splashed from the large flange side adheres to the outer peripheral conical surface (large outer diameter surface) 115 and connects the outer peripheral conical surface 115 to the large diameter end surface 111 of the tapered roller 103. It becomes easy to refuel.

  In this structure, the housing 107 defines an internal space of a device in which the tapered roller bearing device is installed, such as a case that defines an internal space of a vehicle pinion shaft support device (for example, a differential gear device). It may be a housing. In this case, the oil supply passage 104 may communicate between the external space and the internal space of the device in which the bearing device is installed, and oil supply may be performed from the outside of the device in which the bearing device is installed. . The housing 107 may be a partition wall located in the internal space of the vehicle pinion shaft support device. In this case, of course, the gear oil in the vehicle pinion shaft support device is supplied to the outer peripheral conical surface 115.

It is a schematic cross section of the axial direction of the tapered roller bearing apparatus of one Embodiment of this invention. It is a schematic cross section of the axial direction of the tapered roller bearing apparatus of other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,101 Outer ring 2,102 Inner ring 3,103 Tapered roller 4 Oil supply device 7 Housing 10,110 Large collar portion 11,111 Large diameter end surface 14 Guide surface 15,115 Outer conical surface 20 Oil dripping portion 22 Nozzle

Claims (2)

An outer ring having a conical raceway surface;
An inner ring having a conical raceway surface;
A tapered roller disposed between the conical raceway surface of the outer ring and the conical raceway surface of the inner ring,
The inner ring has a large flange on the large diameter side of the conical raceway surface in the inner ring,
The large collar portion has a guide surface that slides with respect to the large-diameter end surface of the tapered roller, and an outer peripheral surface portion that decreases in outer diameter as it goes inward in the axial direction of the inner ring. A tapered roller bearing device. The tapered roller bearing device according to claim 1,
A tapered roller bearing device comprising an oil supply device for supplying oil to the outer peripheral surface portion.

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