JPH041211B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubrication device for a thrust tapered roller bearing, and in particular, an oil passage is provided in the outer ring that reaches the boundary between the collar surface of the outer ring of the bearing and the raceway surface, and a lubricating device is provided between the outer ring and the housing. By providing an oil passage leading to the tapered roller tail side of the outer ring raceway surface on the ring fitted on the inner diameter surface of either one, the sliding contact surface on the outer ring collar surface and the rolling contact on the outer ring and inner ring raceway surfaces can be achieved. The thrust load capacity is greatly increased by reducing the temperature rise with the surface.

For example, a double-row thrust tapered roller bearing with a small volume and large thrust load capacity is suitable as a thrust bearing for the roll neck of a rolling mill, but in recent high-load rolling operations, the thrust load generated on the rolls becomes extremely large. . Under such a large thrust load, not only heat generation occurs between the head side end surface of the tapered roller and the sliding contact surface between the collar surface of the bearing ring, but also the rolling contact between the rolling surface of the tapered roller and the raceway surface of the bearing ring. Test results confirmed that heat generation at contact surfaces is also a major problem. However, when lubricating conventional thrust tapered roller bearings, the amount of lubricant is not appropriate, so the temperature rise on one contact surface is greater than the temperature rise on the other contact surface, and the contact surface with the larger temperature rise The drawback was that the thrust load capacity was limited by the surface.

This invention was made to eliminate the above-mentioned drawbacks, and an object of the invention is to suppress the temperature rise to the same extent at the sliding contact surface and the rolling contact surface between the tapered roller and the bearing ring. Another object of the present invention is to provide a lubrication device for a thrust tapered roller bearing that contributes to an increase in thrust load capacity. An object of the present invention is to provide a lubricating device for a thrust tapered roller bearing in which oil passages can be easily machined.

That is, the present invention has an inner ring 41 fitted on a shaft 11 and housings 12, 13, as in the embodiment illustrated for a roll neck of a rolling mill.
A tapered roller 4 is placed between the outer ring 44 with a flange fitted on the
In a lubricating device for a thrust tapered roller bearing 40 in which a shaft 11 is supported in the axial direction by freely rolling a shaft 11, a shaft 11 is branched from an oil supply passage 14 provided in the housings 12 and 13 and connected to a flange surface 46 of an outer ring. A plurality of oil supply holes 47 that open at the boundary with the raceway surface 45 are bored in the outer ring 44, and branch from a common branch point with the oil supply hole 47 of the outer ring from the oil supply passage 14 of the housing. A plurality of interrupted lubrication holes 68, 69 are formed in the outer ring 44, and an annular lubrication groove 71 communicating with the interrupted lubrication hole 69 of the outer ring is recessed in the outer periphery. 7
A ring 70 in which a plurality of oil supply holes 72 and 73 are drilled, which branch from 1 and open on the tapered roller tail side of the outer ring raceway surface 45, is fitted onto the inner diameter surface of the outer ring 44.
A thruster characterized by comprising a branch circuit consisting of a brim-side oil passage leading to the boundary between the outer ring collar surface 46 and the raceway surface 45 and a tail-side oil passage leading to the tapered roller tail side of the outer ring raceway surface. The first invention provides a lubricating device for a tapered roller bearing, and furthermore, tapered rollers 48 are rotatably disposed between an inner ring 41 fitted to the shaft 11 and a flanged outer ring 44 fitted to the housings 12 and 13. In a lubricating device for a thrust tapered roller bearing 40 that supports a shaft 11 in the axial direction, the oil supply passage 14 branches from the oil supply passage 14 provided in the housings 12 and 13 and opens at the boundary between the collar surface 46 of the outer ring and the raceway surface 45. A plurality of oil supply holes 47 are drilled in the outer ring 44, and a plurality of oil supply holes 47 are formed in the outer ring 44 and branch from a common branch point with the oil supply hole 47 of the outer ring from the oil supply passage 14 of the housing and open on the inner diameter surface of the housings 12, 13. An annular oil supply groove 71 communicating with the interruption oil supply hole 69 of the housing is recessed in the outer peripheral surface, and branches from the oil supply groove 71 to the outer ring raceway surface. A ring 70 having a plurality of oil supply holes 72 and 73 opened on the tail side of the tapered rollers 45 is attached to the housings 12 and 13.
A shunt circuit consisting of a flange-side oil passage that fits into the inner diameter surface and reaches the boundary between the outer ring collar surface 46 and the raceway surface 45, and a tail-side oil passage that reaches the tapered roller tail side of the outer ring raceway surface. The second invention provides a lubricating device for a thrust tapered roller bearing, which is characterized by comprising:

An embodiment of the present invention applied to the roll neck of a rolling mill shown in FIG. 1 will be described below.

In the figure, reference numeral 10 indicates a roll of a rolling mill;
1 indicates a roll neck (shaft), 12 and 13 indicate a housing, and inside the housing 12,
A large diameter portion 11a of the roll neck 11 is supported in the radial direction by a radial tapered roller bearing 16. The radial tapered roller bearing 16 consists of two double-row inner rings 17, two single-row outer rings 18, one ventral row outer ring 19, and four rows of tapered rollers 20. 21
2 is a retainer, 22 is an outer ring spacer, and 23 is an inner ring spacer. The single-row outer ring 18 is positioned in the axial direction by a presser member 25 and a presser ring 26 fitted into the housing 12. The presser member 25 includes
Two seals 28 are fitted through a spacer 29,
Shoulder part of roll 10 and large diameter part 1 of roll neck 11
The lip of the seal 28 is in sliding contact with the outer circumferential surface of the fillet ring 30 which is fitted into the fillet ring 1a. Further, a seal 31 is fitted to the axial end of the presser member 25 by a seal presser 32, and a fillet ring 30 is attached.
A seal 33 is provided between the seal presser 32 and the roll 10 in sliding contact with each other. Reference numeral 34 denotes an oil supply hole through which lubricating oil is forced to circulate.

A thrust tapered roller bearing 40 is provided in the middle diameter portion 11b of the roll neck 11.
is supported in the axial direction. The thrust tapered roller bearing 40 has collars 4 on both end surfaces of an intermediate ring (inner ring) 41 fitted to the middle diameter portion 11b of the roll neck 11.
2 and 43 are brought into contact and fixed in position, and outer rings 44 with flanges are fitted into the housings 12 and 13, respectively, so that they can freely roll between the raceway surface 45 of the outer ring 44 and both end surfaces of the inner ring 41. The rolling surfaces of tapered rollers 48 disposed on the outer ring 44 are brought into contact with each other, and the head side end surface of the tapered rollers 48 is brought into contact with the flange surface 46 of the outer ring 44. 51 is a retainer, 52 is an outer ring spacer, the outer ring spacer 52 is provided with an oil hole 53, and the lower part of the housing 12 is provided with an oil hole 53 of the outer ring spacer 52.
A plurality of oil drain holes 55 are provided which communicate with each other. Moreover, two seals 66 are disposed on both sides with a spacer 65 interposed between the housing 13 and the collar 43 to seal the housing 13 and the collar 43.

As shown in an enlarged view in FIG. 2, the outer ring 44 of the bearing 40 has a plurality of oil supply holes 47 on the same circumference that open at the boundary (grinding clearance) between the raceway surface 45 and the collar surface 46. Each hole is perforated. This oil supply hole 47
The opening end on the back side communicates with the oil supply passage 14 via the oil supply groove 15 formed in the end faces of the housings 12 and 13 (see FIG. 1). The outer ring 44 also has a plurality of axial interrupted oiling holes 68 that communicate with the oiling grooves 15 of the housings 12 and 13, and a plurality of radial interrupted oiling holes 69 that communicate with the interrupted oiling holes 68 and open to the inner diameter surface. Each hole is perforated.

A ring 70 separate from the outer ring 44 is fitted onto the inner diameter surface of the outer ring 44 . This ring 7
0, there is an interrupted oil supply hole 69 of the outer ring 44 on the outer peripheral surface of the outer ring 44.
An annular oil supply groove 71 is recessed and communicates with the open end of the oil supply groove 71, and a plurality of oil supply holes 72 branch from the oil supply groove 71 in the axial direction, and an annular oil supply hole 72 that communicates with the oil supply hole 72 and opens on the tail side of the tapered roller 48. Radial oil supply hole 73
and is drilled.

In this way, lubricating oil is supplied from the oil supply passages 14 of the housings 12 and 13 to the bearing 40 through the oil supply holes 47 branching from the oil supply grooves 15 of the housings 12 and 13 to the collar surface 46 of the outer ring 44 and the raceway surface. 45 and the interrupted oil supply holes 68 and 69 branching from the oil supply grooves 15 of the housings 12 and 13, and then through the oil supply grooves 71 and oil supply holes 72 and 73 of the ring 70 to the outer ring raceway. Side 4
5, and a tail side oil passage leading to the tail side of the tapered roller 5, forming a branch circuit with the oil supply grooves 15 of the housings 12 and 13 as a common branch point.
In this case, in the embodiment described above, the oil supply groove 15 connected to the oil supply passage 14 of the housing is formed in the housing, but the oil supply groove 15 may also be provided in the outer ring 44.

By configuring the shunt circuit as above,
When lubricating oil at a constant pressure is fed into the oil supply passages 14 of the housings 12, 13, the lubricating oil is diverted from the oil supply grooves 15 of the housings 12, 13 to the brim side oil passages.
The lubricating oil is injected toward the sliding contact surface between the head side end surface of the tapered roller 48 and the flange surface 46 of the outer ring 44, and is diverted to the other tail side oil passage. The lubricating oil is injected toward the rolling contact surface between the raceway surfaces of the outer ring 44 and the inner ring 41, and the lubricating oil is supplied to the sliding contact surface and the rolling contact surface, respectively.

In this way, the lubricating oil supplied inside the bearing passes through the oil passage hole 53 of the outer ring spacer 52 and is discharged to the outside from the oil drain hole 55 of the housing 12.

In addition, in the ring 70 of the above embodiment, the radial oil supply hole 73 is omitted, and the axial oil supply hole 73 is omitted.
2 may be opened at the end face of the ring 70.

FIG. 3 shows the oil supply hole 47 of the outer ring 44 constituting the brim side oil passage, the interrupted oil supply holes 68, 69 of the outer ring 44 constituting the tail side oil passage, and the oil supply groove of the ring 70. 71, the collar surface 46 of the outer ring 44 corresponds to the amount of oil supplied to the collar side oil passage and the tail side oil passage by using several types of outer rings and rings with different hole diameters and lengths with the oil supply holes 72 and 73. and raceway surface 45
This figure shows the results of investigating temperature changes between In the figure, the vertical axis shows the temperature rise (degC), the horizontal axis shows the oil supply amount (/min), the A line shows the temperature of the collar surface, and the B line shows the temperature of the raceway surface, respectively.

As is clear from the figure, the temperature of the collar surface 46 of the outer ring 44 and the raceway surface 45 has a correlation with the ratio of the oil supply amount between the collar side oil passage and the tail side oil passage.
When the oiling amount of the brim side oil passage is 10 to 15/min and the tail side oiling amount is 10 to 5/min, that is,
The lowest temperature rise occurs when the ratio of the amount of oil supplied between the two is in the range of 1 to 1/3, and as the amount of lubrication on the flange side becomes smaller than the amount of lubrication on the tail side, the temperature rises not only on the flange surface but also on the track. It can be seen that the temperature of the raceway surface as well as the temperature of the collar surface increases when the amount of oil supplied on the collar side exceeds three times the amount of oil supplied on the tail side.

Therefore, optimal lubrication conditions can be obtained by setting the oil flow resistance of each oil passage so that the distribution ratio between the amount of oil supplied on the brim side and the amount of oil supplied on the tail side is 1 to 1/3. This means that the temperature rise between the sliding contact surface and the rolling contact surface of the bearing can be suppressed to a minimum, and the thrust load capacity can be maximized.

The oil flow resistance between the brim side oil passage and the tail side oil passage is
The required values can be set by appropriately selecting the number of oil supply holes, interrupted oil supply holes, etc., hole diameters, length dimensions, and other conditions that constitute each oil passage.

The amount of oil supplied to the brim side oil passage and the tail side oil passage is affected not only by the oil passage resistance of each oil passage, but also by the oil pressure in the housing oil passage. An oil supply groove is interposed at the inlet of each oil passage, and this oil supply groove is a common branch point for each oil passage, and the oil supply pressure in the oil supply groove can be easily adjusted, so the amount of oil supplied can be adjusted. can be distributed accurately and easily.

Further, since it is not necessary to provide a large number of oil supply passages in the housing for the branch circuit consisting of the brim side oil passage and the tail side oil passage, drilling of the housing becomes easy.

Since the ring 70 of the embodiment described above does not have the function of a bearing ring, it can be made of a material that is more workable than the bearing ring, such as brass. When such a material is used, the oil supply groove 71 and the oil supply holes 72, 73 can be easily machined, so that they can be manufactured at a lower cost than when the oil supply holes are provided in the outer ring itself.

FIG. 4 shows another embodiment of the present invention, in which the oil supply hole 47 constituting the oil passage on the brim side of the outer ring 44 has the same structure as the embodiment shown in FIG. A plurality of interrupted oil supply holes 69 are formed by branching in the radial direction from the oil supply groove 15 of the housing 12, and the interruption oil supply holes 69 are opened on the inner diameter surface of the housing 12. The oil supply groove 71 is configured to be connected to the open end of the interrupted oil supply hole 69 of the housing 12 by being fitted onto the surface and brought into contact with the back surface of the outer ring 44 .

As explained above, the present invention provides an oil supply hole that opens at the boundary between the collar surface and the raceway surface in the outer ring of a thrust tapered roller bearing to form a rib side oil passage, and provides a flow path between the outer ring and the housing. An interrupted lubrication hole is provided on one side, and a ring fitted on the inner diameter surface of either the outer ring or the housing has an lubrication groove that communicates with the interrupted lubrication hole, and a lubrication groove that branches from the lubrication groove and opens toward the tail of the tapered roller. An oil supply hole is provided to form a tail side oil passage, and the brim side oil passage and the tail side oil passage are configured as a branch circuit branching from a common branch point of the oil supply passage of the housing.

Therefore, according to the present invention, by appropriately setting the oil passage resistance between the collar side oil passage and the tail side oil passage, the sliding contact surface on the collar surface of the outer ring and the rolling contact on the raceway surface of the raceway ring can be prevented. The amount of oil can be distributed and supplied to each surface at an appropriate ratio, and the oil supply pressure in the housing's oil supply passage can be easily adjusted, making the distribution ratio of the amount of oil supplied extremely accurate. Become.

For this reason, it is possible to suppress the temperature rise of both the sliding contact surface and the rolling contact surface of the bearing to the same extent, and it is possible to significantly increase the thrust load capacity. A lubricating device most suitable for tapered roller bearings where thrust loads are generated can be obtained.

Further, according to the present invention, as the tail side oil passage, a ring separate from the outer ring is fitted on the inner diameter surface of either the outer ring or the housing, and the oil supply hole is passed from the oil supply groove on the outer peripheral surface of the ring. Since the structure is such that the oil supply hole is provided in a branched manner, it is not only unnecessary to provide the oil supply hole for the tail side oil passage in the outer ring, but also the number of interrupted oil supply holes on either the outer ring or the housing that communicate with the oil supply groove of the ring is reduced. Since the number of holes is only a fraction of that of the oil supply hole, drilling of the oil supply hole becomes simple and easy.

Furthermore, according to the present invention, even when the bearing has reached the end of its useful life and the bearing parts are replaced with new ones, the ring itself does not need to be replaced and can be reused, resulting in an economical lubrication device as a whole. Become.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention;
FIG. 2 is an enlarged view of the main part, FIG. 3 is a diagram showing the relationship between the amount of oil supplied and the temperature between the outer ring collar surface and the raceway surface, and FIG. 4 is a diagram showing another embodiment of the present invention. FIG. In the figure, 11 is the roll neck (shaft), 12, 13
is the housing, 14 and 15 are oil supply passages and oil grooves of the housing, 40 is a thrust tapered roller bearing, 41 is an inner ring, 44 is an outer ring, 45 and 46 are raceway surfaces and rib surfaces of the outer ring, respectively, and 47 is an oil supply hole in the outer ring. , 68, 69 are relay oil supply holes, 70 is a ring, 7
1 is a ring oil supply groove, and 72 and 73 are ring oil supply holes.

Claims (1)

[Claims] 1. Lubrication of a thrust tapered roller bearing in which tapered rollers are rotatably disposed between an inner ring fitted to a shaft and a flanged outer ring fitted to a housing to support the shaft in the axial direction. In the apparatus, a plurality of oil supply holes are formed in the outer ring and branch from the oil supply passage provided in the housing and open at the boundary between the collar surface of the outer ring and the raceway surface, and a plurality of oil supply holes are formed in the outer ring from the oil supply passage of the housing. A plurality of interrupted oil supply holes are drilled in the outer ring, which branch from a common branching point with the oil supply hole of the outer ring and open on the inner diameter surface of the outer ring, and an annular oil supply groove communicating with the intermediate oil supply hole of the outer ring is recessed in the outer circumferential surface. A ring having a plurality of oil supply holes that branch from the oil supply groove and open on the tapered roller tail side of the outer ring raceway surface is fitted onto the inner diameter surface of the outer ring, and the ring is connected to the outer ring collar surface and raceway. A lubricating device for a thrust tapered roller bearing, characterized in that a branch circuit is constituted of a brim-side oil passage leading to a boundary with a surface and a tail-side oil passage leading to a tapered roller tail side of an outer ring raceway surface. 2. Change the oil flow resistance between the brim side oil passage and the tail side oil passage so that the distribution ratio between the amount of oil supplied to the brim side oil passage and the amount of oil supplied to the tail side oil passage is 1 to 1/3. A lubrication device for a thrust tapered roller bearing as set forth in claim 1. 3. In a lubrication device for a thrust tapered roller bearing in which tapered rollers are rotatably disposed between an inner ring fitted to a shaft and a flanged outer ring fitted to a housing to support the shaft in the axial direction, the housing is A plurality of oil supply holes are drilled in the outer ring that branch from the provided oil supply passage and open at the boundary between the collar surface of the outer ring and the raceway surface, and a plurality of oil supply holes are formed in the outer ring from the oil supply passage of the housing. A plurality of relay oil supply holes branching from a branch point and opening on the inner diameter surface of the housing are bored in the housing, and an annular oil supply groove communicating with the relay oil supply holes of the housing is recessed in the outer peripheral surface, and the oil supply A ring with multiple oil supply holes that branch from the groove and open on the tapered roller tail side of the outer ring raceway surface is fitted onto the inner diameter surface of the housing, and is placed at the boundary between the outer ring collar surface and the raceway surface. A lubricating device for a thrust tapered roller bearing, comprising a branch circuit consisting of a brim-side oil passageway and a tail-side oil passageway that reaches the tapered roller tail side of an outer ring raceway surface. 4. Change the oil flow resistance between the brim side oil passage and the tail side oil passage so that the distribution ratio between the amount of oil supplied to the brim side oil passage and the amount of oil supplied to the tail side oil passage is 1/3. A lubricating device for a thrust tapered roller bearing as set forth in claim 3.