JP2003232339A - Taper land thrust bearing and rotary machine equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a taper land thrust bearing having a cooling structure capable of avoiding a serious situation such as a seizure even when a thrust load concentration to a part of a bearing pad occurs, and also to provide a rotary machine equipped therewith. <P>SOLUTION: The taper land thrust bearing is comprised of: a taper where a plurality of bearing pads are provided at a bearing face opposite to a thrust disc of a rotation axis in the radial direction, the bearing pad is lubricated with bearing oil respectively, and a bearing gap becomes gradually narrower from a front end to a rear end; and a land in succession to a rear end of the taper to make a plane parallel with the thrust bearing. A passage of bearing oil is provided at the lower part along the taper and the land to cool the land and the taper by flowing of the bearing oil under the surface of the land and the taper. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tapered land thrust bearing used in a rotary machine such as a large-sized supercharger and a rotary machine including the same, and more particularly to an improvement in a cooling structure thereof.

[0002]

2. Description of the Related Art In recent years, there has been a great demand for increasing thrust load on tapered land thrust bearings of rotary machines. For example, in a large diesel engine of a ship, a power plant, etc., a supercharger that uses exhaust gas to rotate a turbine to supply combustion air to the engine by a compressor is used. Tend to
Even in the supercharger, the thrust load of the rotating shaft increases due to the increase in size, and there is a demand for a thrust bearing capable of withstanding the load.

As a thrust bearing for a large-sized rotary machine of this type, a taper land thrust bearing has been conventionally used. The conventional taper land thrust bearing will be described below with reference to FIGS. 8 to 11. 8 is an axial sectional view of a conventional taper land thrust bearing, FIG. 9 is a partially cutaway perspective view of a conventional taper land thrust bearing, and FIG. 10 is an enlarged view of part A in FIG. It is a perspective view of the bearing pad vicinity of a thrust bearing. FIG. 11 shows FIG.
FIG. 3 is a partial cross-sectional view in the circumferential direction of the taper land thrust bearing taken along the line B-B in FIG.

8 and 9 show an oil supply pipe, a circumferential oil groove,
Bearing oil supply / drainage system for oil supply passages, oil supply holes, oil grooves, etc.
The same applies to the embodiments of the present invention to be described later, except for a part of the shape of the device, and will be referred to as an overall explanatory view of the tapered land thrust bearing.

As shown in FIG. 8, a taper land thrust bearing (hereinafter simply referred to as "taper land bearing") 1 is
The bearing flange 7 is arranged on the bearing base 7 so as to face the thrust disk 14 (rotational direction a) that rotates integrally with the rotary shaft 13 while receiving the thrust S, and the fixing flange 6 formed around the bearing base 7 is fixed by the fixing bolts 10. It is fixed to.

As shown in FIGS. 9 to 11, a plurality of bearing pads 2 are provided on the bearing surface facing the thrust disk 14 in the circumferential direction (rotational direction a). Each bearing pad 2 has a bearing clearance 15 between the thrust disc 14 and an oil groove 3 provided for supplying bearing oil between an inner peripheral wall portion 12a and an outer peripheral wall portion 12b whose upper end forms a bearing surface.
Is gradually narrowed from the front end toward the rear, and the land portion 12 is formed continuously with the bearing clearance 15 parallel to the thrust disk 14 and flush with the upper ends of the inner peripheral wall portion 12a and the outer peripheral wall portion 12b. Has become. In addition,
The bearing clearance 15 is schematically illustrated wider than it actually is, and is similar in other drawings.

Although the tapered land bearing 1 has thrust load capability with or without the land portion 12, theoretically, the taper portion 11 has a thrust load capacity with respect to the distance between the oil grooves 3 (the length of the bearing pad 2). The maximum load capacity is generated when the ratio is around 80%. Therefore, the taper portion 11 is provided over a length of about 80% from the front end side of the bearing pad 2 in the relative rotation direction b of the taper land bearing 1 with respect to the thrust disk 14 (opposite to the rotation direction a of the rotation shaft 13). The remaining about 20% is the land portion 12.

In the present specification, the expressions "front" and "rear", which are expressed as "forward", "rearward", "front end", and "rear end", refer to the same relative rotation direction b, and hereafter, to that effect. Is omitted.

Various methods can be used for supplying the bearing oil y. In the case of the methods shown in FIGS. 8 to 11, the bearing oil y is provided from the oil supply pipe 8 of the bearing stand 7 along the outer peripheral portion of the tapered land bearing 1. The oil is once supplied to the circumferential oil groove 9, the oil is supplied to the oil groove 3 through the oil supply passages 5 and the oil supply holes 4 provided in the tapered land bearing 1 in the same number as the oil groove 3, and the bearing oil y is supplied to the bearing clearance 15. It

Further, as shown in FIG. 10, the oil supply passage 5 is normally arranged in the radial direction of the tapered land bearing 1 (indicated by an arrow Y in FIG.
Direction) and connects the circumferential oil groove 9 and the oil supply hole 4 in the shortest direction.

In the conventional taper land bearing 1 as described above, it is difficult to avoid the shape error of each component, particularly the bearing stand 7, and the assembly error of each part, and the thrust load is generated due to the deflection of the rotary shaft 13. If it becomes severe, the load may concentrate on some of the bearing pads 2.

The bearing surface of the taper land bearing 1 is thermally expanded and deformed when the load is increased. In particular, the bearing pad 2 in which the load is once concentrated undergoes further thermal deformation than the other bearing pads 2 as described above. On the other hand, since the bearing stand 7 is a highly rigid portion, thermal deformation unilaterally appears on the bearing clearance 15 side, and the bearing oil film in the bearing clearance 15 of the bearing pad 2 becomes even thinner, eventually leading to seizure. There was a fear of problems.

Even when no load is concentrated on one bearing pad 2, new bearing oil is supplied to each oil groove 3 to be cooled, so that thermal deformation occurs more than at the rear end of the bearing pad 2. It becomes the largest deformation in the front and acts as if the effective length in the circumferential direction of one bearing pad 2 becomes smaller, and the thrust load capability of the taper land bearing 1 decreases,
The vicious cycle of increasing the heat generation of the bearing may occur, and the bearing function may be impaired. In addition, if the cooling capacity is supplemented by the amount of oil supplied, the facility cost and running cost will increase.

[0014]

SUMMARY OF THE INVENTION The present invention solves the problems of the conventional taper land thrust bearing as described above, and even if the thrust load is concentrated on a part of the bearing pads, a serious situation such as seizure occurs. And a tapered land thrust bearing that does not reduce the thrust load capacity of the bearing even if there is deformation due to thermal expansion of the bearing surface and does not need to increase the amount of bearing oil supplied for cooling purposely. It is an object of the present invention to provide a rotating machine equipped with.

[0015]

(1) The present invention has been made to solve the above problems. As a first means thereof, a bearing pad is provided on a bearing surface facing a thrust disk of a rotary shaft. Are provided in the circumferential direction, and each of the bearing pads has a tapered portion in which the bearing oil is supplied and the bearing clearance between the thrust disk and the thrust disk gradually narrows from the front end to the rear, and the same at the rear end of the tapered portion. A taper land thrust bearing including a thrust disk and a land portion that forms a plane parallel to the thrust disk, wherein the bearing oil passage is provided below the taper portion and the land portion. Provide a taper land thrust bearing.

According to the first means, the bearing oil cools the land portion and the tapered portion while flowing downward along the land portion and the tapered portion, so that the load concentration on a part of the bearing pads is temporarily assumed. Even if it occurs, it prevents expansion due to thermal deformation of the bearing pad, prevents from falling into a vicious cycle of heat generation, thermal deformation, reduction of bearing oil film, heat generation, avoids serious situations such as seizure, and prevents thrust load. It is possible to prevent the effective length of each bearing pad from becoming smaller due to thermal deformation due to the increase, and to prevent the thrust load capacity of the tapered land thrust bearing from decreasing and the heat generation of the bearing from increasing.

(2) As the second means, in the tapered land thrust bearing of the first means, the bearing oil flow path provided below the tapered portion and the land portion is the tapered portion. An oil supply passage communicating with an oil groove provided at a front end of the portion for supplying the bearing oil, the oil supply passage being provided in a direction inclined forward or backward with respect to a radial direction of the taper land thrust bearing. A taper land thrust bearing is provided.

According to the second means, in addition to the function of the first means, the oil supply of relatively low temperature bearing oil flows along the land part and the tapered part while flowing through the oil supply passage provided below the land part. Since the tapered portion is cooled, the cooling efficiency is high.

(3) As a third means, in the tapered land thrust bearing of the second means, the diameter of the bearing inner peripheral side communicating with the oil groove of the oil supply passage is smaller than the diameter of the bearing outer peripheral side. Provided is a tapered land thrust bearing.

According to the third means, in addition to the function of the second means, the oil supply passage can be provided while avoiding interference with the front end side of the tapered portion deeper than the bearing surface and the oil groove, and the bearing oil. The heat exchange efficiency is improved by increasing the flow velocity.

(4) As a fourth means, in the taper land thrust bearing of the first means, the bearing oil flow path provided below the taper portion and the land portion is the taper land thrust. A plurality of circumferential flow passages provided around the center of the bearing, wherein the circumferential flow passages are each filled with the bearing oil and opened at the front end of the tapered portion. A tapered land thrust bearing is provided.

According to the fourth means, in addition to the operation of the first means, the supply of relatively low temperature bearing oil causes a plurality of circumferential grooves provided below the taper portion and the land portion. Since it flows through to the opening at the front end of the tapered portion, all of the plurality of bearing pads above the circumferential groove are uniformly cooled.

(5) As a fifth means, in the tapered land thrust bearing of the fourth means, the front end of the tapered portion forms a V-shaped groove extending in the radial direction of the bearing and an opening communicating with the circumferential groove. And a rear surface of the V-shaped groove is inclined in the rotational direction of the thrust disk.

According to the fifth means, in addition to the function of the fourth means, the rear surface of the V-shaped groove is inclined in the rotational direction of the thrust disk, so that the bearing oil in the circumferential groove is absorbed by the thrust disk. When the oil is viscous and drawn into the taper part from the opening by the rotation of the bearing, the viscosity of the bearing oil simultaneously causes a flow of the bearing oil in the same direction in the circumferential groove, and a circulating flow of oil supply occurs in the circumferential groove, which causes a heat exchange effect improves.

(6) As a sixth means, in the taper land thrust bearing of the first means, the flow path of the bearing oil provided below the taper portion and the land portion along the taper portion and the land portion is the same as that of the bearing pad. An oil sump provided on the back surface of the taper land thrust bearing so as to guide the waste oil of the bearing oil that has flowed out to the inner peripheral side through the axial gap between the rotary shaft and the taper land thrust bearing and temporarily store it. And a taper land thrust bearing.

According to the sixth means, in addition to the function of the first means, the back surface of the taper land bearing is temporarily filled with the discharge oil of the bearing oil that has been conventionally discharged. Are uniformly cooled.

(7) As a seventh means, in the tapered land thrust bearing according to any one of the second means to the fifth means, the exhaust oil of the bearing oil flowing out to the inner peripheral side of the bearing pad is rotated. Provided is a taper land thrust bearing characterized in that an oil sump is provided on the back surface of the taper land thrust bearing so that the oil is introduced and temporarily stored through a gap between the shaft and the taper land thrust bearing.

According to the seventh means, in addition to the operation of any one of the second means to the fifth means, the back surface of the tapered land bearing is temporarily filled with the drain oil of the bearing oil which has been simply discharged conventionally. Since the configuration is adopted, the entire tapered land bearing is uniformly cooled.

(8) As an eighth means, in the tapered land thrust bearing according to the sixth means or the seventh means, the gap around the shaft and the oil sump rotate in the same radial direction of the rotary shaft. Provided is a taper land thrust bearing characterized in that the taper land thrust bearing is communicated with a flow path formed to be inclined with respect to a rotation direction of a shaft.

According to the eighth means, in addition to the operation of the sixth means or the seventh means, the waste oil of the bearing oil flowing in while rotating with the rotary shaft can more easily flow into the oil sump, and the waste oil can be discharged. Flows into the oil sump while still having a rotational motion component, the exhaust oil in the oil sump circulates as a whole, and a part of the waste oil is prevented from stagnating and overheating, improving the heat exchange effect. .

(9) As a ninth means, there is provided a rotary machine comprising the tapered land thrust bearing according to any one of the first to eighth means.

According to the ninth means, by any one of the operations of the first means to the eighth means, troubles such as seizure due to overheating of the thrust bearing are prevented while suppressing an increase in manufacturing cost of the rotary machine. The reliability of the rotating machine is improved and the thrust load capacity is also improved.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION A tapered land thrust bearing according to a first embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a partial plan view of the bearing surface of the tapered land thrust bearing of the present embodiment, which corresponds to the line CC in FIG.

The taper land thrust bearing of the present embodiment (hereinafter, simply referred to as "taper land bearing". The same applies to the description of other embodiments below) 101.
The entire structure other than the part shown in FIG. 1 is the same as that shown in FIGS. 8 and 9 described above. Therefore, referring also to FIGS. 8 and 9, the same parts are designated by the same reference numerals and the description thereof will be omitted. However, the different parts will be mainly described below. This also applies to other embodiments described later.

As shown in FIG. 1, the oil supply passage 105 of the tapered land bearing 101 of this embodiment is provided from the oil supply hole 4 of the oil groove 3 toward the outer peripheral side in the bearing radial direction Y as in the conventional case. Rather than the bearing radial direction Y, it is inclined backward by θ and passes below the taper portion 11 and the land portion 12 which are lubricated from the lubrication holes 4.

The oil supply y is performed from a circumferential oil groove 9 (not shown in FIG. 1) provided along the outer circumference of the tapered land bearing 101 to the oil supply passage 105 and communicates with the tip end side of the oil supply passage 105. It is supplied to the oil groove 3 via 4.

Therefore, according to the taper land bearing 101 of this embodiment, the temperature is relatively low (for example, about 40 ° C.).
Since the oil supply y cools the land portion 12 and the taper portion 11 while flowing through the oil supply passage 105 provided below the surface thereof, even if the load concentration on a part of the bearing pad 2 occurs, the bearing pad 2. Prevents expansion due to thermal deformation, heat generation,
A vicious cycle of thermal deformation, reduction of bearing oil film, and heat generation can be prevented, and a serious situation such as seizure can be avoided.

Further, the effective length of each bearing pad 2 is prevented from being reduced due to the thermal deformation due to the increase in the thrust load, and the thrust load capacity of the taper land bearing 101 is prevented from being lowered and the heat generation of the bearing is prevented from being increased. There is no risk of functional problems, equipment costs for increasing refueling amount,
It is possible to avoid an increase in running cost.

In this embodiment, the oil supply passage 1
Although not shown, the inclination direction of 05 with respect to the radial direction Y of the bearing may be the opposite direction of FIG. 1, or may be inclined forward from the oil supply hole 4 of the oil groove 3 with respect to the radial direction Y of the bearing. In that case, the oil supply passage 105 has the bearing pad 2 on the upstream side.
After passing through the land portion 12 and the taper portion 11 below, the oil supply y flows under the surface of the bearing pad 2 on the upstream side to cool the bearing pad 2.

Further, in the present embodiment, as shown in FIG. 1, the oil supply passage 105 'has a bearing inner peripheral side (the side connected to the oil supply hole 4), and the oil supply passage 105a' has a small diameter and a bearing outer peripheral side ( If the diameter of the oil supply passage 105b 'connected to the circumferential oil groove 9 (not shown in FIG. 1) is made large, the bearing inner peripheral oil supply passage 105a' interferes with the tapered portion 11 and the oil groove 3 formed deeply. It is possible to prevent this from occurring, and it is possible to improve heat exchange by increasing the bearing oil flow rate due to the reduced diameter.

A taper land thrust bearing according to the second embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a partial plan view of the bearing surface of the tapered land thrust bearing of the present embodiment, which corresponds to the line CC in FIG.
FIG. 3A is a circumferential sectional view taken along the line DD in FIG.
(B) is a radial direction sectional view taken along the line EE in FIG.
FIG. 4C is a radial cross-sectional view taken along the line FF in FIG.
FIG. 6 is a perspective view of the vicinity of a bearing pad. 5 (a), 5 (b)
3A and 3B are explanatory views of a modified example of the present embodiment, respectively, and correspond to EE arrow in FIG.

As shown in FIGS. 2 to 4, the tapered land bearing 201 of the present embodiment is provided with a plurality of circumferential grooves 221 on the back surface thereof under the surface of each bearing pad 202 and around the center of the bearing. And the plurality of circumferential grooves 2 with the tapered land bearing 201 mounted on the bearing stand 207.
A plurality of concentric annular bearing oil flow passages 21 are formed below each taper portion 211 and land portion 212.

Further, in each bearing pad 202, the tapered portion 211 in which the bearing clearance 15 with the thrust disc 14 is gradually narrowed between the inner peripheral wall portion 212a and the outer peripheral wall portion 212b which form the bearing surface facing the thrust disc 14. And a bearing clearance 15 which is continuous with the thrust disk 14 and has a land portion 212 which is flush with the upper ends of the inner peripheral wall portion 212a and the outer peripheral wall portion 212b.

A notch-shaped deep V-shaped groove 223 extending in the radial direction of the bearing is formed on the front end side of the tapered portion 211 of the bearing pad 202, and the lowermost end of the V-shaped groove 223 has a plurality of circumferential grooves 221. An opening 222 is formed in the V-shaped groove 223 for each circumferential groove 221.

Further, at a key portion of the bearing base 207, an oil supply chamber 220 communicating with a plurality of circumferential grooves 221 with the taper land bearing 201 mounted on the bearing base 207 is provided. Via an oil supply pipe 208 in the bearing base 207, it communicates with an appropriate oil supply source.

As described above, in the taper land bearing 201 of the present embodiment, refueling y is performed from the refueling pipe 208 provided in the bearing base 207 to the refueling chamber 220 and the circumference communicating with the refueling chamber 220. The opening 222 through the groove 221
Is supplied to the V-shaped groove 223, and the bearing oil y is supplied to the bearing clearance 15.

Therefore, according to the taper land bearing 201 of the present embodiment, the temperature is relatively low (for example, about 40 ° C.).
Refueling y flows from the refueling chamber 220 through the plurality of circumferential grooves 221 to the V-shaped groove 223, so that the taper portion 211 and the land portion 212, that is, the bearing pad 202, above the circumferential groove 221 are all evenly distributed. Cooled without.

As a result, even if the load is concentrated on a part of the bearing pads 202, expansion due to thermal deformation of the bearing pads 202 is prevented, and a vicious cycle of heat generation, thermal deformation, bearing oil film reduction, and heat generation may occur. Prevents serious problems such as seizure.

Further, the effective length of each bearing pad 202 is prevented from becoming smaller due to the thermal deformation due to the increase of the thrust load, the thrust load capacity of the taper land bearing 201 is prevented from being lowered, and the heat generation of the bearing is prevented from being increased. It is possible to prevent the function from being hindered, and it is possible to avoid an increase in equipment cost and running cost for increasing the amount of refueling.

The communication between the circumferential groove 221 and the taper portion 211 can obtain the above-mentioned effects by the oil groove 3 shown in FIG. 1 or FIG. 9, but in particular, as shown in FIG. When the opening 222 of the circumferential groove 221 is provided by the deep V-shaped groove 223 in the notch shape on the front end side of the taper portion 211, the rear surface of the V-shaped groove 223 of the bearing pad 202 is in the rotational direction a of the thrust disk 14. Circumferential groove 221 because it is inclined
When the lubrication oil y of the bearing oil inside is drawn into the tapered portion 211 from the opening 222 by the rotation a of the thrust disk 14 due to the viscosity (arrow y1 in the figure), the viscosity of the bearing oil simultaneously causes the same in the circumferential groove 221. Flow of bearing oil (in the figure, arrow y
2) occurs, a circulating flow of oil supply is generated in the circumferential groove 221, the heat exchange action is improved, and the bearing pad 202 is cooled more effectively.

In addition, in the present embodiment, FIG.
As shown in Fig. 5, the radial pitches of the plurality of circumferential grooves 221 are set such that the pitch Pb on the outer peripheral side is smaller than the pitch Pa on the inner peripheral side of the bearing, or By making the flow passage cross-sectional area of the outer circumferential side circumferential groove 221b larger than the flow passage cross-sectional area of the inner circumferential side circumferential groove 221a in the groove 221, the thrust load is usually larger on the outer circumferential side. It will be easy to deal with. Of course, when the thrust load on the inner peripheral side is large due to the usage conditions of the taper land bearing 201, the reverse arrangement is preferable.

A tapered land thrust bearing according to the third embodiment of the present invention will be described with reference to FIGS. 6 and 7. Figure 6
FIG. 7 is an axial cross-sectional view of the tapered land thrust bearing of the present embodiment, and FIG. 7 is a cross-sectional view taken along the line GG in FIG. As shown in FIGS. 6 and 7, in the taper land bearing 301 of the present embodiment, an oil sump 330 is provided on a bearing stand 307 on the back side thereof, and the taper land bearing 301 flows out to the inner peripheral side of the bearing pad 2 of the taper land bearing 301. The waste oil y4 of the bearing oil y is guided to the oil sump 330 and temporarily stored therein, and substantially the entire rear surface of the tapered land bearing 301 is brought into contact with the waste oil y4 to cool it.

The tapered land bearing 301 is lubricated into the bearing pad 2 by an appropriate means (see FIG. 6 showing the conventional example shown in FIG. 8 or the first embodiment of the present invention shown in FIG. 1). Similarly, oil supplied through the oil supply pipe 8, the circumferential oil groove 9, and the oil supply passage 5 is shown), but the bearing oil y overflowing from the bearing pad 2 is drained oil y3 flowing out to the outer peripheral side and the inner peripheral side. It is the drained oil y4 that has spilled.

On the other hand, in the tapered land bearing 301, the entire rear surface thereof is not supported by the bearing base 307, but the rib 331 provided on the bearing base 307 surrounding the rotary shaft 13 and the bearing for the fixing bolt 10. It is partially supported by a fixing bolt seat 332 provided on the base 307, or an appropriate step portion 335 provided on the bearing base 307.

A portion other than those supporting portions serves as an oil sump 330 for the drained oil y4 that has come out to the inner peripheral side, and the drained oil y4 is the axial clearance 33 between the rotary shaft 13 and the tapered land bearing 301.
4 and is led to the oil sump 330. That is, an oil sump 330 serving as a flow path of bearing oil is formed below the bearing pad 2 of the taper land bearing 301. Note that FIG.
In FIG. 7, the gap 334 around the axis is schematically illustrated wider than it actually is.

An oil drain port 333 for discharging the drain oil y4 is provided above the oil sump 330. FIG. 6 shows the case where the rotary shaft 13 is horizontally arranged, but the oil drain port 333 is provided at an appropriate position for temporarily storing the oil drain y4 in the oil sump 330.

The rib 331 is provided on the bearing base 307 so as to surround the rotary shaft 13. However, in order to allow the drained oil y4 to flow into the oil sump 330 from the axial gap 334, the rib 331 is intermittently provided in the circumferential direction as shown in FIG. Is provided for the purpose of forming a flow path 331a that connects the axial gap 334 and the oil sump 330.

The flow path 331a is formed so as to be inclined with respect to the radial direction of the rotary shaft 13 in the rotational direction a of the rotary shaft 13 (thrust disk 14), and flows in while rotating with the rotary shaft 13. The drained oil y4 is guided to the oil sump 330 more easily. Further, since the drain oil y4 flows into the oil sump 330 while having a rotational motion component, the waste oil y4 in the oil sump 330 circulates as a whole, and a part of the waste oil y4 stagnates and becomes overheated. Is prevented and heat exchange efficiency is also improved.

In the taper land bearing 301 of the present embodiment as described above, the oil drainage y4 from the bearing pad 2 of the taper land bearing 301 to the inner peripheral side is the axial clearance 3
The oil passes through the flow path 331 a between the ribs 331 to enter the oil sump 330, and cools the tapered land bearing 301 from the back surface. For example, the temperature of the oil supply y is about 4 as the temperature of the oil discharge y4.
In the case of about 0 ° C., it is usually about 70 ° and can work as a sufficiently effective cooling medium.

The drain oil y4 in the oil sump 330 is discharged from the drain port 33.
Since it is overflowed from 3 and discharged, it is replaced one after another, so there is no overheating due to long-term retention.

Therefore, according to the taper land bearing 301 of the present embodiment, since the back surface of the taper land bearing 301 is temporarily filled with the oil drained from the bearing which has been conventionally discharged, the whole taper land bearing 301 is Even if the load is concentrated on a part of the bearing pads 2 as a result, the expansion due to thermal deformation of the bearing pads 2 is prevented, and heat generation, thermal deformation, bearing oil film reduction, and heat generation occur. A vicious cycle is prevented, and serious situations such as seizure can be avoided.

Further, the effective length of each bearing pad 2 is prevented from being reduced by thermal deformation due to the increase in thrust load, the thrust load capacity of the tapered land bearing 301 is prevented from being lowered, and the heat generation of the bearing is prevented from being increased. There is no risk of functional problems, equipment costs for increasing refueling amount,
It is possible to avoid an increase in running cost.

The first to third embodiments of the tapered land thrust bearing according to the present invention have been described above. However, the supercharging provided with the tapered land thrust bearing according to any one of the first to third embodiments. For rotating machines such as machines, problems such as seizure due to overheating of taper land thrust bearings are prevented while suppressing an increase in manufacturing costs of rotating machines, reliability of rotating machines is improved, and thrust load capacity is also improved. The size of rotating machinery can be increased easily and the range of applicable plants can be expanded.

Although the present invention has been described above with reference to the illustrated embodiments, the present invention is not limited to such embodiments.
It goes without saying that various modifications may be made to the specific structure within the scope of the present invention.

[0065]

(1) According to the invention of claim 1, the tapered land thrust bearing is provided with a plurality of bearing pads in the circumferential direction on the bearing surface facing the thrust disk of the rotary shaft. A taper consisting of a taper part where the bearing oil is supplied and the bearing clearance between the thrust disc and the thrust disc gradually narrows from the front end to the rear, and a land part which is continuous with the rear end of the taper part and forms a plane parallel to the thrust disc. In the land thrust bearing, the bearing oil is configured to have the flow passage of the bearing oil provided below the taper portion and the land portion, so that the bearing oil flows along the land portion and the taper portion. Since the land part and the taper part are cooled while flowing downward, even if load concentration on some bearing pads occurs, expansion due to thermal deformation of the bearing pads is prevented, heat generation, thermal deformation, A vicious cycle of oil film reduction and heat generation is prevented, serious situations such as seizure can be avoided, and the effective length of each bearing pad is prevented from becoming smaller due to thermal deformation due to an increase in thrust load. It is possible to prevent a decrease in thrust load capacity of the taper land thrust bearing and an increase in heat generation of the bearing, eliminate the possibility of impairing the bearing function, and avoid an increase in equipment cost and running cost for increasing the amount of oil supply.

(2) According to the invention of claim 2, claim 1
In the taper land thrust bearing according to, the flow path of the bearing oil provided below the taper portion and the land portion is in communication with an oil groove provided at the front end of the taper portion, In addition to the effect of the invention of claim 1, since the oil supply passage is configured to be provided in a direction inclined forward or backward with respect to the radial direction of the taper land thrust bearing, Since the relatively low temperature bearing oil is cooled along the land portion and the tapered portion while flowing through the oil feeding passage provided below the land portion and the tapered portion, the cooling efficiency is increased.

(3) According to the invention of claim 3, claim 2
The taper land thrust bearing according to the present invention is configured such that the diameter of the bearing inner peripheral side communicating with the oil groove of the oil supply passage is formed smaller than the diameter of the bearing outer peripheral side. In addition, the oil supply passage can be provided while avoiding the interference with the front end side of the tapered portion deeper than the bearing surface and the oil groove, and the heat exchange can be improved by increasing the bearing oil flow rate.

(4) According to the invention of claim 4, claim 1
In the taper land thrust bearing described in (1), the flow path of the bearing oil provided below the taper portion and the land portion is a plurality of circumferential flows provided around the center of the taper land thrust bearing. In addition to the effect of the invention of claim 1, in addition to the effect of the invention of claim 1, the same circumferential flow path is configured to be opened at the front end of the tapered portion while the bearing oil is being supplied. Since the low-temperature bearing oil is supplied to the opening at the front end of the tapered portion through the plurality of circumferential grooves provided below the tapered portion and the land portion, the plurality of bearings above the circumferential groove are provided. All pads can be cooled uniformly.

(5) According to the invention of claim 5, claim 4
In the tapered land thrust bearing according to the above paragraph, the front end of the tapered portion forms a V-shaped groove extending in the bearing radial direction to form an opening communicating with the circumferential groove, and the rear surface of the V-shaped groove is Since the thrust disc is configured to be inclined in the rotation direction, in addition to the effect of the invention of claim 4, the rear surface of the V-shaped groove is inclined in the rotation direction of the thrust disc, so When the bearing oil is viscously drawn into the taper from the opening by the rotation of the thrust disk, the viscosity of the bearing oil causes the bearing oil to flow in the same direction in the circumferential groove at the same time. Occurs, the heat exchange action is improved, and the bearing pad is cooled more effectively.

(6) According to the invention of claim 6, claim 1
In the tapered land thrust bearing according to the above paragraph, the flow path of the bearing oil provided below the taper portion and the land portion along with the drainage of the bearing oil flowing out to the inner peripheral side of the bearing pad is In addition to the effect of the invention of claim 1, the oil sump is provided on the back surface of the taper land thrust bearing for guiding and temporarily storing the oil through the gap around the shaft between the rotary shaft and the taper land thrust bearing. Since the back surface of the taper land thrust bearing is temporarily filled with the discharge oil of the bearing oil that has been simply discharged conventionally, the entire taper land thrust bearing can be cooled uniformly.

(7) According to the invention of claim 7, claim 2
The tapered land thrust bearing according to any one of claims 1 to 5, wherein the exhaust oil of the bearing oil flowing out to the inner peripheral side of the bearing pad is guided through an axial gap between the rotary shaft and the tapered land thrust bearing. Since the oil reservoir is provided on the back surface of the taper land thrust bearing for temporary storage, in addition to the effect of the invention according to any one of claims 2 to 5, the bearing oil that has been simply discharged in the past is also used. With the configuration in which the back surface of the tapered land thrust bearing is temporarily filled with the drained oil, the entire tapered land thrust bearing can be cooled uniformly.

(8) According to the invention of claim 8, claim 6
Alternatively, in the taper land thrust bearing according to claim 7, the axial gap and the oil sump are provided via a flow path formed by being inclined with respect to a radial direction of the rotary shaft in a rotational direction of the rotary shaft. Since it is configured so as to communicate with each other, in addition to the effect of the invention of claim 6 or claim 7, the exhaust oil of the bearing oil flowing in while rotating with the rotating shaft can more easily flow into the oil sump, and the exhaust oil is By flowing into the oil sump with the rotary motion component, the exhaust oil in the oil sump circulates as a whole, a part of the waste oil is prevented from stagnating and overheating, and heat exchange efficiency is also improved. .

(9) According to the invention of claim 9, since the rotary machine is constituted so as to be provided with the taper land thrust bearing according to any one of claims 1 to 8,
According to the effects of any one of claims 1 to 8, troubles such as seizure due to overheating of the taper land thrust bearing are prevented, reliability of the rotating machine is improved, and an increase in manufacturing cost of the rotating machine is suppressed. At the same time, the thrust load capacity of the bearing is also improved, making it easier to increase the size of rotating machinery,
The range of applicable plants is expanded.

[Brief description of drawings]

FIG. 1 is a partial plan view of a bearing surface of a tapered land thrust bearing according to a first embodiment of the present invention.

FIG. 2 is a partial plan view of a bearing surface of a tapered land thrust bearing according to a second embodiment of the present invention.

3A is a circumferential cross-sectional view taken along the line DD of FIG. 2, FIG. 3B is a radial cross-sectional view taken along the line EE of FIG.
(C) is a radial direction sectional view taken along the line FF in FIG. 2.

FIG. 4 is a perspective view near the bearing pad of FIG.

5 (a) and 5 (b) are explanatory views of a modified example of the tapered land thrust bearing of the second embodiment corresponding to the line EE in FIG. 2, respectively.

FIG. 6 is an axial sectional view of a taper land thrust bearing according to a third embodiment of the present invention.

7 is a cross-sectional view taken along line GG in FIG. 6, which is perpendicular to the rotation axis of the bearing base.

FIG. 8 is an axial sectional view of a conventional taper land thrust bearing.

FIG. 9 is a partially cutaway perspective view of a conventional taper land thrust bearing.

FIG. 10 is an enlarged view of a portion A in FIG. 9, and is a perspective view near a bearing pad of a conventional taper land thrust bearing.

11 is a partial cross-sectional view in the circumferential direction of the conventional taper land thrust bearing taken along the line BB in FIG.

[Explanation of symbols]

1 taper land bearing (taper land thrust bearing) 2 bearing pad 3 oil groove 4 oil supply hole 5 oil supply passage 6 fixing flange 7 bearing stand 8 oil supply pipe 9 circumferential oil groove 10 fixing bolt 11 taper portion 12 land portion 12a inner peripheral wall Part 12b Outer peripheral wall part 13 Rotating shaft 14 Thrust disk 15 Bearing clearance 101 Tapered land bearing (taper land thrust bearing) 105, 105 'Oil supply passage 106 Fixing flange 201 Tapered land bearing (taper land thrust bearing) 202 Bearing pad 207 Bearing stand 208 Oil supply pipe 211 Tapered part 212 Land part 212a Inner peripheral wall part 212b Outer peripheral wall part 220 Oil supply chamber 221 Circumferential groove 222 Opening 223 V-shaped groove 301 Tapered land bearing (tapered land thrust bearing) 307 Bearing stand 330 Oil sump 331 Rib 331a Flow Passage 332 fixing bolt seat 333 oil drain hole 334 axial gap 335 step

Claims (9)

[Claims] 1. A plurality of bearing pads are provided in a circumferential direction on a bearing surface of a rotary shaft facing a thrust disc, and the bearing pads are respectively supplied with bearing oil, and a bearing clearance between the thrust disc and the thrust disc gradually increases from the front end to the rear. In a tapered land thrust bearing comprising a tapered portion narrowing to a lower end and a land portion which is continuous with the rear end of the tapered portion and forms a plane parallel to the thrust disk, the tapered land thrust bearing is provided below the tapered portion and the land portion. Taper land thrust bearing, characterized in that it has a flow path of the bearing oil. 2. The tapered land thrust bearing according to claim 1, wherein the bearing oil flow passage provided below the tapered portion and the land portion is an oil provided at a front end of the tapered portion. An oil supply passage communicating with a groove for supplying the bearing oil, the oil supply passage being provided in a direction inclined forward or backward with respect to a radial direction of the taper land thrust bearing. Thrust bearing. 3. The taper land thrust bearing according to claim 2, wherein a diameter of a bearing inner peripheral side communicating with the oil groove of the oil supply passage is formed smaller than a diameter of a bearing outer peripheral side. Tapered land thrust bearing. 4. The tapered land thrust bearing according to claim 1, wherein the bearing oil flow path provided below the tapered portion and the land portion is provided around a center of the tapered land thrust bearing. A plurality of circumferential flow passages, each of which is provided with the bearing oil and has an opening at the front end of the taper portion. 5. The tapered land thrust bearing according to claim 4, wherein a front end of the tapered portion forms a V-shaped groove extending in a radial direction of the bearing to form an opening communicating with the circumferential groove. A tapered land thrust bearing, wherein a rear surface of the groove is inclined in a rotation direction of the thrust disk. 6. The tapered land thrust bearing according to claim 1, wherein the flow path of the bearing oil provided below the tapered portion and the land portion flows out to the inner peripheral side of the bearing pad. A taper land provided on the back surface of the taper land thrust bearing so as to guide the exhaust oil of the bearing oil through an axial gap between the rotary shaft and the taper land thrust bearing and temporarily store the taper land. Thrust bearing. 7. The taper land thrust bearing according to claim 2, wherein the bearing oil discharged to the inner peripheral side of the bearing pad is discharged to the rotary shaft and the taper land thrust bearing. The taper land thrust bearing is characterized in that an oil sump is provided on the back surface of the taper land thrust bearing so as to be guided through the gap around the shaft and temporarily stored. 8. The tapered land thrust bearing according to claim 6 or 7, wherein the axial clearance and the oil sump are tilted in a rotational direction of the rotary shaft with respect to a radial direction of the rotary shaft. A taper land thrust bearing characterized by being communicated with each other through a formed flow path. 9. A rotary machine comprising the taper land thrust bearing according to any one of claims 1 to 8.