JP2003222123A - Taper land thrust bearing and rotary machine equipped with this bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a taper land thrust bearing whose thrust load capacity is not lowered irrespective of deformation caused by thermal expansion of a bearing surface and a rotary machine equipped with the bearing. <P>SOLUTION: The taper land thrust bearing has a plurality of a bearing pads provided in a peripheral direction of a bearing surface opposed to a thrust disk of a rotating shaft. The bearing pad has, between interior and exterior peripheral walls whose upper limits define a bearing surface, a tapered portion having a forward end thereof connected to an oil groove and a bearing clearance between the thrust disk and the tapered portion which becomes gradually narrower from the oil groove to a backside, and a land portion that is successive to the tapered portion and is parallel with the thrust disc, defining the same plane with upper limits of interior and exterior peripheral walls, wherein the tapered portion and a surface deeper than the land portion are provided in a part of the tapered portion and land portion. The rotary machine is equipped with the taper land thrust bearing. <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 taper land thrust bearing used for a rotary machine and the like and a rotary machine provided with the same.

[0002]

2. Description of the Related Art A conventional taper land thrust bearing will be described with reference to FIGS. 9 is an axial sectional view of a conventional taper land thrust bearing, FIG. 10 is a partially cutaway perspective view of the taper land thrust bearing, FIG. 11 is a partial sectional view of the taper land thrust bearing in the circumferential direction, and FIG.
FIG. 12 is an explanatory view of thermal deformation of the conventional taper land thrust bearing, and is a cross-sectional view in the same direction as FIG. 11.

Note that FIGS. 9 and 10 are the same in the embodiments of the present invention described later, except for some differences such as the taper portion and the land portion, and are referred to as an overall explanatory view of the taper land thrust bearing. I will.

As shown in FIG. 9, a taper land thrust bearing (hereinafter simply referred to as "taper land bearing") 01
Faces 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 on the periphery is fixed to the bearing stand 7 by the fixing bolt 10.

A plurality of bearing pads 02 are provided in the circumferential direction (rotation direction a) on the bearing surface facing the thrust disk 14. In each bearing pad 02, the bearing clearance 15 between the thrust disk 14 and the oil groove 3 provided for supplying oil gradually increases between the inner peripheral wall portion 12a and the outer peripheral wall portion 12b whose upper end forms a bearing surface. Tapered portion 11 that becomes narrower
And the bearing clearance 15 which is continuous with the thrust disk 14 is parallel to the inner peripheral wall 12a and the outer peripheral wall 12b.
And a land portion 12 that is flush with the upper end of the. Reference numeral 3a is a chamfer, which overflows the oil from the oil groove 3 to increase the flow rate of refueling, promotes the cooling effect by refueling, and promotes the discharge of foreign matters and the like.

Although the taper land bearing 01 has thrust load capability with or without the land portion 12, theoretically, with respect to the interval C of the oil groove 3 (the length of the bearing pad 02) C,
When the ratio of the tapered portion 11 is around 80%, the maximum load capacity is generated. Therefore, the taper portion 11 has a relative rotation direction b of the taper land bearing 01 with respect to the thrust disk 14.
(Rotation direction a of the rotary shaft 13 and the thrust disk 14
From the front end side (X in FIG. 11) in the opposite direction).
It is provided over a length of 8C.

In the present specification, the expressions "front", "rear", "front end", "rear end" and the like "front", "rear", and "upstream" and "downstream" mean the same relative rotation. It is assumed to be in the direction b, and the note to that effect is omitted hereinafter.

Although various methods can be used for refueling, in the case of those shown in FIGS. 9 to 11, the oil is temporarily supplied from the refueling pipe 8 of the bearing stand 7 to the circumferential oil groove 9 of the outer periphery of the tapered land bearing 01. Oil is supplied to the oil grooves 3 through the oil supply passages 5 and the oil supply holes 4 provided in the same number as the oil grooves 3.

Conventional taper land bearing 01 as described above
12, the bearing surface thermally expands and deforms as the load on the bearing increases, as shown by the broken line e in FIG. 12, but in the tapered land bearing 01, each bearing pad 02 is sandwiched between the oil grooves 3. , The oil groove 3 is cooled because new oil is supplied. Therefore, the mode of thermal deformation is
Is the largest deformation in front of the rearmost end 12c of
As if the size of one bearing pad 02 is from C to C1
It acts as if it becomes smaller, and the ratio of the tapered portion 11 also fluctuates greatly.

As a result, the thrust load capacity of the taper land bearing 01 is reduced, which causes a vicious cycle of increasing heat generation of the bearing, which may impair the bearing function. In addition, if it is attempted to supplement it with the amount of refueling, the facility cost and running cost will increase.

[0011]

SUMMARY OF THE INVENTION The present invention solves the problems of the conventional taper land thrust bearing as described above, and the thrust load capacity of the bearing does not decrease even if the bearing surface is deformed by thermal expansion. Another object of the present invention is to provide a taper land thrust bearing that does not need to unnecessarily increase the amount of oil supply and a rotary machine including the same.

[0012]

(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 an upper end between the inner peripheral wall portion and the outer peripheral wall portion that form the bearing surface, a front end that is continuous with the oil groove, and extends rearward from the oil groove to the thrust disk. Of the bearing has a taper portion where the bearing clearance is gradually narrowed, and a land portion which is continuous with the rear end of the tapered portion and is parallel to the thrust disk and is flush with the upper ends of the inner peripheral wall portion and the outer peripheral wall portion. In the land thrust bearing, there is provided a tapered land thrust bearing, wherein a part of the tapered portion and the land portion is provided with a surface deeper than the tapered portion and the land portion.

According to the first means as described above, since the tapered portion and the land portion are partially provided with the surfaces deeper than the tapered portion and the land portion, the expanded portion due to the thermal deformation due to the thrust load is scraped off in advance. After the thermal deformation, an operation close to the taper ratio of 0.8, which is the maximum load capacity point, becomes possible, and the entire length of the bearing pad can effectively function as the bearing surface even after the thermal deformation.

(2) As a second means, in the tapered land thrust bearing of the first means, a second taper portion, which connects the rear end of the land portion and the middle of the taper portion, is formed in the land portion. A taper land thrust bearing characterized by being provided instead.

According to the second means, the second taper portion, which connects the rear end of the land portion and the middle of the taper portion, is provided in place of the land portion, and is deeper than a part of the taper portion and the original land portion. By forming the surface, the action of the first means can be achieved.

(3) As a third means, in the taper land thrust bearing of the second means, the depth of the front end of the second tapered portion is the amount of thermal deformation under the usage conditions of the taper land thrust bearing. Provided is a taper land thrust bearing characterized by being set together.

According to the third means, in addition to the function of the second means, the maximum load capacity point of the taper land thrust bearing can be obtained with respect to a predetermined amount of thermal deformation assumed by the usage conditions of the taper land thrust bearing. The operation close to a certain taper ratio of 0.8 can be accurately enabled.

(4) As a fourth means, in the taper land thrust bearing of the first means, a tapered surface having a narrower width in the radial direction of the bearing than the tapered portion and a depth parallel to the tapered portion is provided in the tapered portion. There is provided a tapered land thrust bearing, characterized in that a third taper portion whose rear end is inserted into the land portion is provided.

According to the fourth means, the taper portion is provided with a third taper portion having a width narrower in the bearing radial direction than the taper portion and a deep taper surface with an inclination parallel to the taper portion and a rear end of which enters the land portion. As a result, the action of the first means can be achieved.

(5) As a fifth means, in the tapered land thrust bearing of the first means, the width of the tapered portion in the radial direction of the bearing is narrower than that of the tapered portion, and the oil is formed at the same depth as the tapered portion at the front end. Provided is a tapered land thrust bearing characterized in that a fourth tapered portion which is continuous with the groove and forms a deep tapered surface with a gentler inclination than the tapered portion and whose rear end is inserted into the land portion is provided.

According to the fifth means, the tapered portion has a width narrower than that of the tapered portion in the radial direction of the bearing and is continuous with the oil groove at the same depth as the tapered portion at the front end and forms a deep tapered surface with a gentler inclination than the tapered portion. By providing the fourth taper portion whose rear end enters the land portion, the action of the first means can be achieved.

(6) As a sixth means, in the taper land thrust bearing of the first means, the tapered portion has a width narrower in the bearing radial direction than the tapered portion and is continuous at the front end to the front and rear intermediate portions of the tapered portion. Provided is a tapered land thrust bearing, characterized in that a fifth tapered portion having a deeper tapered surface with a gentler inclination than the tapered portion and having a rear end inserted into the land portion is provided.

According to the sixth means, the width of the taper portion in the radial direction of the bearing is narrower than that of the taper portion, and the front end is continuous with the front and rear intermediate portions of the taper portion and forms a deep taper surface with a gentler inclination than the taper portion and the rear end is formed. The action of the first means can be achieved by providing the fifth taper portion that enters the land portion.

(7) As a seventh means, in the taper land thrust bearing of the sixth means, the depth of the front end of the fifth taper portion is adjusted according to the amount of thermal deformation under the usage conditions of the taper land thrust bearing. Provided is a tapered land thrust bearing characterized by being set.

According to the seventh means, in addition to the function of the sixth means, the maximum load capacity point of the taper land thrust bearing is obtained with respect to a predetermined thermal deformation amount assumed by the usage condition of the taper land thrust bearing. The operation close to a certain taper ratio of 0.8 can be accurately enabled.

(8) As an eighth means, in the tapered land thrust bearing of the first means, the width of the land portion in the bearing radial direction is narrower than that of the tapered portion, and the front end is continuous with the front and rear intermediate portions of the tapered portion. A tapered land thrust bearing is provided, which is parallel to the land portion and has a plane deeper than the land portion, and a recess formed at the rear end of the land portion to form a step portion.

According to the eighth means, the width of the land portion in the bearing radial direction is narrower than that of the taper portion, the front end is continuous with the front and rear intermediate portions of the taper portion, forms a plane parallel to the land portion and deeper than the land portion, and the rear end By providing the recess portion that forms the step portion in the land portion, the action of the first means can be achieved.

(9) As a ninth means, in the taper land thrust bearing of the eighth means, the depth of the recess portion is set in accordance with the amount of thermal deformation under the usage conditions of the taper land thrust bearing. And a taper land thrust bearing.

According to the ninth means, in addition to the function of the eighth means, the maximum load capacity point of the taper land thrust bearing is obtained with respect to a predetermined thermal deformation amount assumed by the usage conditions of the taper land thrust bearing. The operation close to a certain taper ratio of 0.8 can be accurately enabled.

(10) A tenth means provides a rotary machine comprising the taper land thrust bearing according to any one of the first to ninth means.

According to the tenth means, the rotary machine is the first
By the action of the taper land thrust bearing according to any one of the first to ninth means, the thrust load capacity of the bearing can be increased while suppressing an increase in manufacturing cost, and troubles such as seizure of the bearing can be prevented. Since the reliability of the rotary machine is improved, it becomes easy to increase the size of the rotary machine and the range of applicable plants is expanded.

[0032]

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 cross-sectional view in the circumferential direction of the tapered land thrust bearing of this embodiment.

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 hereinafter) 1a is shown in FIG.
The whole structure other than the part shown in FIG. 9 is the same as that shown in FIGS. 9 and 10 described above. Therefore, referring to FIGS. The different parts will be mainly described below. This also applies to other embodiments described later.

As shown in FIG. 1, the bearing pad 2a of the tapered land bearing 1a according to the present embodiment has no land portion, and has two tapered portions between the inner peripheral wall portion 12a and the outer peripheral wall portion 12b of the bearing surface. The taper portion (hereinafter referred to as the “first taper portion”) 11 formed in the same manner as in the conventional example shown in FIGS. 9 to 11 has a middle portion on the downstream side and a rear end portion 12c of the conventional land portion 12. The second taper portion 11a that is continuous is provided in place of the conventional land portion 12.

The second taper 11a has a gentler inclination than the first taper portion 11 and forms a taper surface deeper than the rear part of the conventional taper portion 11 and the land portion 12, and the rear end of the oil groove 3 on the downstream side. The upper edge, that is, the upper ends of the inner peripheral wall portion 12a and the outer peripheral wall portion 12b, reach the same plane.

In FIG. 1, the taper shape of the conventional ordinary taper land bearing 01 is shown by a broken line f, and the ratio B / C of the tapered portion 11 to the bearing pad length C is the maximum load capacity point 0. It is designed for .8.

In the present embodiment, the ratio A / C of the first tapered portion 11 to the length C of the bearing pad 2a is 0.5.
~ 0.8. The depth d of the front end of the second taper portion 11a is set to a depth corresponding to a predetermined amount of thermal deformation assumed by the usage conditions of the taper land bearing 1a, for example, about 20 microns or less.

According to the taper land bearing 1a of the first embodiment as described above, the thermally deformed portion is previously formed in the second taper portion 1a.
Since it is scraped off as 1a, it becomes possible to operate near the taper ratio of 0.8 which is the maximum load capability point after thermal deformation, and the total length C of the bearing pad 2a can effectively function as a bearing surface even after thermal deformation. It is like this.

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 perspective view of the vicinity of a bearing pad of the tapered land thrust bearing of the present embodiment, and FIG. 3 is a partial cross-sectional view of the tapered land thrust bearing of the present embodiment in the circumferential direction.

As shown in FIGS. 2 and 3, the bearing pad 2b of the tapered land bearing 1b of the present embodiment has an inner peripheral wall portion 12a similar to the tapered portion of a conventional ordinary tapered land bearing.
And the first taper portion 11 provided between the outer peripheral wall portion 12b
The center of the bearing radial direction (in the direction of the arrow Y in the figure) of the
The width in the bearing radial direction Y is narrower than that of the taper portion 11 and is slightly deeply cut in parallel to form a third taper portion 11b.

The angle of the third taper portion 11b is the same as that of the first taper portion 11, and the range covered by the third taper portion 11b is enlarged so as to enter the land portion 12. The taper ratio B1 / C of the length B1 of the third taper portion 11b to the length C of the bearing pad 2b is between 0.8 and 1.0,
The B / C of the first taper portion 11 is set to be larger than 0.8.

According to the taper land bearing 1b of the second embodiment as described above, since the third taper portion 11b has a large taper ratio B1 / C, the maximum load capacity is obtained even in the cross section after thermal deformation. The shape is close to the taper ratio, the operation close to the maximum load capacity is possible even after thermal deformation, and the entire length C of the bearing pad 2b can effectively serve as the bearing surface.

Since the thermal deformation increases in the central portion of the bearing pad 2b in the bearing radial direction Y, it is not necessary to provide the third taper portion 11b until reaching the inner peripheral wall portion 12a and the outer peripheral wall portion 12b of the bearing pad 2b. .

A tapered land thrust bearing according to the third embodiment of the present invention will be described with reference to FIGS. 4 and 5. Figure 4
5 is a perspective view of the vicinity of a bearing pad of the tapered land thrust bearing of the present embodiment, and FIG. 5 is a partial cross-sectional view of the tapered land thrust bearing of the present embodiment in the circumferential direction.

As shown in FIGS. 4 and 5, the bearing pad 2c of the tapered land bearing 1c of the present embodiment has an inner peripheral wall portion 12a similar to the tapered portion of a conventional ordinary tapered land bearing.
And the first taper portion 11 provided between the outer peripheral wall portion 12b
The fourth taper portion 11c is formed by cutting the central portion of the bearing radial direction Y in the bearing radial direction Y narrower than the first taper portion 11 so as to have a narrower width in the bearing radial direction Y. The angle of the fourth tapered portion 11c is shallower than that of the first tapered portion 11,
And the depth of the oil groove 3 at the entrance is made uniform, and the range covered by the fourth taper portion 11c is enlarged so as to enter the land portion 12. The taper ratio B2 / C of the length B2 of the fourth tapered portion 11c to the length C of the bearing pad 2c is 0.8 to 1.0.
Between the first taper portion 11 and B / C≈0.8.

According to the taper land bearing 1c of the third embodiment as described above, since the fourth taper portion 11c has a large taper ratio B2 / C, the maximum load capacity is obtained even in the cross section after thermal deformation. The shape is close to the taper ratio, the operation close to the maximum load capacity point is possible even after thermal deformation, and the total length C of the bearing pad 2c can effectively serve as the bearing surface.

Since the thermal deformation is large in the central portion of the bearing in the bearing radial direction Y, the inner peripheral wall portion 1 of the bearing pad 2c.
2a, the fourth taper portion 11c until reaching the outer peripheral wall portion 12b
Need not be provided. Further, since the taper angle is shallower than the shape of the third tapered portion 11b of the second embodiment, the bearing flow rate can be reduced.

Although the second and third embodiments have been described above, as shown in the explanatory view of the modification of FIG. 6, the positions of the third taper portion 11b and the fourth taper portion 11c in the bearing radial direction Y. May be displaced from the central portion toward the outer peripheral wall portion 12b or closer to the inner peripheral wall portion 12a. The effect of suppressing the thermal deformation is great when it is slightly moved to the outer peripheral side, and it is possible to completely move it to the outer peripheral wall 12b side.
Also, the bulge on the inner peripheral side may become large depending on the restraint conditions of the taper land bearings 1b and 1c. In such a case, the third taper portion 11b ′ and the fourth taper portion 11c ′ should be provided as illustrated. The taper may be closer to the inner peripheral wall 12a side or may be deeper toward the inner peripheral wall 12a side.

A taper land thrust bearing according to the fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a perspective view of the vicinity of the bearing pad of the taper land thrust bearing of the present embodiment.

As shown in FIG. 7, the bearing pad 2d of the taper land bearing 1d of the present embodiment has an inner peripheral wall portion 12a and an outer peripheral wall portion 12b similar to the taper portion and the land portion of a conventional ordinary taper land bearing. A first tapered portion 11 and a land portion 12 provided between the first tapered portion 11 and the land portion 12. The first tapered portion 11 is newly formed in the center portion of the land portion 12 in the bearing radial direction Y and is continuous with the first tapered portion 11. 5 taper part 11d is comprised.

The fifth taper portion 11d has the rear end as the rearmost end portion 1 of the land portion 12 as in the cross section of the first embodiment of FIG.
2c, that is, a tapered shape reaching the upper end of the oil groove 3 may be provided, or a partial taper as shown in FIG. 7 may be used.
The front end of the fifth taper portion 11d is smoothly continuous with the first taper portion 11 upstream of the rear end of the first taper portion 11 and forms a slightly deeper tapered surface with a gentler inclination than the first taper portion 11. The rear end has entered the land portion 12.

The depth of the front end of the fifth taper portion 11d is set to a depth corresponding to a predetermined amount of thermal deformation assumed by the usage conditions of the taper land bearing 1d, and is about 20 microns or less, for example. .

According to the taper land bearing 1d of the fourth embodiment as described above, since the fifth taper portion 11d is provided only at a portion where the thermal deformation is large, it is possible to increase the oil supply flow rate of the entire taper land bearing 1d. The optimum shape after the deformation can be realized, the operation near the maximum load capacity can be performed even after the thermal deformation, and the entire length of the bearing pad 2d can effectively serve as the bearing surface. In addition, the fifth taper portion 11
Since d is short, processing becomes easy.

A tapered land thrust bearing according to the fifth embodiment of the present invention will be described with reference to FIG. Figure 8 (a)
FIG. 4 is a perspective view of the vicinity of a bearing pad of the taper land thrust bearing of the present embodiment, and FIG. 4B is a partial cross-sectional view of the taper land thrust bearing of the present embodiment in the circumferential direction.

The bearing pad 2e of the taper land bearing 1e of this embodiment has an inner peripheral wall portion 12a and an outer peripheral wall portion 1 similar to the taper portion and the land portion of a conventional ordinary taper land bearing.
2b and the first taper portion 11 and the land portion 1 provided between
2 is formed in the center of the land portion 12 in the radial direction Y of the bearing and is newly formed as a circle, an ellipse, or an ellipse in the radial direction Y
A shallow recess 11e having a depth of about 0 micron or less is formed.

The front end of the recess 11e is the first taper portion 1
1, which is smoothly continuous with the first taper portion 11 on the upstream side of the rear end and forms a slightly deep flat surface in parallel with the land portion 12,
The rear end has entered the land portion 12.

The depth of the recess 11e is set to a depth corresponding to a predetermined amount of thermal deformation assumed by the usage conditions of the taper land bearing 1e, and is, for example, about 20 microns or less.

According to the taper land bearing 1e of the fifth embodiment described above, the shape of the bearing pad 2e after thermal deformation does not become a taper, but there is a step at the downstream end of the recessed portion 11e, and due to the damming effect, hydraulic pressure is exerted. The generation is promoted, the load capacity is improved without increasing the oil supply flow rate, the operation close to the maximum load capacity is possible even after thermal deformation, and the bearing pad 2b
The full length C of the above can effectively function as a bearing surface. Furthermore, the machining is extremely easy because the machining is completed only by applying a tool to the land portion 12.

Further, the rotary machine provided with the tapered land thrust bearing according to any one of the first to fifth embodiments as described above has a thrust load capacity of the bearing while suppressing an increase in manufacturing cost of the rotary machine. Since the trouble such as seizure of the bearing is prevented and the reliability of the rotating machine is improved, the rotating machine can be easily increased in size and the range of applicable plants is 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.

[0061]

(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. Between the inner peripheral wall and the outer peripheral wall of which the upper end forms the bearing surface, the front end is continuous with the oil groove, and the tapered portion in which the bearing clearance between the oil groove and the thrust disk gradually narrows rearward, and the same taper. In a taper land thrust bearing including a land portion that is continuous with the rear end of the portion and is parallel to the thrust disk and that is flush with the upper ends of the inner peripheral wall portion and the outer peripheral wall portion, a portion of the taper portion and the land portion Since a surface deeper than the taper portion and the land portion is provided in the thrust portion, the thrust portion has a surface deeper than the surface of the taper portion and the land portion. The expanded portion due to thermal deformation due to the load has been scraped off in advance, allowing operation close to the taper ratio of 0.8, which is the maximum load capacity point, after thermal deformation, and the total length of the bearing pad remains even after thermal deformation. It can effectively act as a bearing surface.

Therefore, even if the bearing surface is deformed due to thermal expansion, the thrust load capacity of the bearing does not decrease, and it is possible to obtain a taper land thrust bearing that does not need to increase the amount of oil supply unnecessarily.

(2) According to the invention of claim 2, claim 1
In the taper land thrust bearing according to the third aspect, since the second taper portion that connects the rear end of the land portion and the middle of the taper portion is provided instead of the land portion, The second taper portion which connects the end and the middle of the taper portion is provided in place of the land portion, and a part of the taper portion and a surface deeper than the original land portion are formed, whereby the effect of the invention of claim 1 is achieved. Can play.

(3) According to the invention of claim 3, claim 2
In the tapered land thrust bearing according to the above paragraph,
The depth of the front end of the taper portion is set in accordance with the amount of thermal deformation under the usage conditions of the taper land thrust bearing. Therefore, in addition to the effect of the invention of claim 2,
It is possible to accurately enable the operation close to the taper ratio 0.8, which is the maximum load capability point of the taper land thrust bearing, with respect to the predetermined amount of thermal deformation assumed by the usage conditions of the taper land thrust bearing.

(4) According to the invention of claim 4, claim 1
The tapered land thrust bearing according to claim 3, wherein the tapered portion has a narrower radial width than the tapered portion in the bearing radial direction and forms a deep tapered surface with an inclination parallel to the tapered portion, and a rear end of the tapered portion extends into the land portion. Since the taper portion is provided with the third taper portion, the tapered portion has a width narrower in the bearing radial direction than the taper portion and has a deep taper surface with an inclination parallel to the taper portion and the rear end enters the land portion. Thereby, the effect of the invention of claim 1 can be obtained.

(5) According to the invention of claim 5, claim 1
In the tapered land thrust bearing according to the item (1), the tapered portion has a width narrower in the bearing radial direction than the tapered portion and is continuous with the oil groove at the front end at the same depth as the tapered portion. Since the fourth taper portion, which forms a surface and whose rear end enters into the land portion, is provided, the width of the taper portion in the radial direction of the bearing is narrower than that of the taper portion and the oil groove has the same depth as the taper portion at the front end. By providing the fourth tapered portion which is continuous with the tapered portion and forms a deep tapered surface with a gentler inclination than the tapered portion and the rear end of which enters the land portion, the effect of the invention of claim 1 can be obtained.

(6) According to the invention of claim 6, claim 1
In the taper land thrust bearing described in 1, the tapered portion has a narrower width in the radial direction of the bearing than the tapered portion, and the front end is continuous with the front and rear intermediate portions of the tapered portion and forms a deep tapered surface with a gentle slope from the tapered portion. Since it is configured such that the fifth taper portion whose end enters the land portion is provided,
A fifth taper portion, which has a narrower width in the radial direction of the bearing than the taper portion, is continuous with the front and rear intermediate portions of the taper portion at the front end, has a deeper tapered surface with a gentle slope than the taper portion, and has the rear end entering the land portion is provided. As a result, the effect of the invention of claim 1 can be obtained. Further, since the fifth tapered portion is short, it is easy to process.

(7) According to the invention of claim 7, claim 6
In the taper land thrust bearing described in the paragraph 5,
In addition to the effect of the invention of claim 6, the depth of the front end of the taper part is set in accordance with the amount of thermal deformation under the usage conditions of the taper land thrust bearing.
It is possible to accurately enable the operation close to the taper ratio 0.8, which is the maximum load capability point of the taper land thrust bearing, with respect to the predetermined amount of thermal deformation assumed by the usage conditions of the taper land thrust bearing.

(8) According to the invention of claim 8, claim 1
In the tapered land thrust bearing according to the item (1), the land portion has a width that is narrower in the bearing radial direction than the tapered portion, and the front end is continuous with the front and rear intermediate portions of the tapered portion to form a plane parallel to the land portion and deeper than the land portion. Since the rear end is provided with a recess forming a step in the same land, the width of the land in the bearing radial direction is narrower than that of the tapered part, and the front end is continuous with the front and rear intermediate parts of the tapered part. The effect of the invention of claim 1 can be obtained by providing a recess portion which is parallel to and is deeper than the land portion and whose rear end forms a step portion in the land portion. Further, since the machining is completed only by applying the tool to the land portion, the machining is extremely easy.

(9) According to the invention of claim 9, claim 8
In the taper land thrust bearing according to the present invention, since the depth of the recess portion is set in accordance with the amount of thermal deformation under the usage conditions of the taper land thrust bearing, in addition to the effect of the invention of claim 8, With respect to a predetermined amount of thermal deformation assumed by the usage conditions of the taper land thrust bearing, it is possible to accurately enable an operation close to the taper ratio 0.8 which is the maximum load capacity point of the taper land thrust bearing.

(10) According to the tenth aspect of the invention, the rotary machine is configured to include the taper land thrust bearing according to any one of the first to ninth aspects. According to this, the rotary machine can increase the thrust load capacity of the bearing while suppressing an increase in the manufacturing cost of the rotary machine by the action of the taper land thrust bearing according to any one of claims 1 to 9. Since problems such as seizure of bearings are prevented and the reliability of the rotary machine is improved, it is easy to increase the size of the rotary machine and the range of applicable plants is expanded.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view in the circumferential direction of a tapered land thrust bearing according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the vicinity of a bearing pad of a tapered land thrust bearing according to a second embodiment of the present invention.

FIG. 3 is a partial cross-sectional view in the circumferential direction of a tapered land thrust bearing according to a second embodiment of the present invention.

FIG. 4 is a perspective view of the vicinity of a bearing pad of a tapered land thrust bearing according to a third embodiment of the present invention.

FIG. 5 is a partial cross-sectional view in the circumferential direction of a tapered land thrust bearing according to a third embodiment of the present invention.

FIG. 6 is an explanatory diagram of modifications of the second and third embodiments of the present invention.

FIG. 7 is a perspective view near a bearing pad of a taper land thrust bearing according to a fourth embodiment of the present invention.

FIG. 8A is a perspective view of the vicinity of a bearing pad of a tapered land thrust bearing according to a fifth embodiment of the present invention,
(B) is a partial cross-sectional view in the circumferential direction of the taper land thrust bearing.

FIG. 9 is an axial sectional view of a conventional taper land thrust bearing.

10 is a partially cutaway perspective view of the tapered land thrust bearing of FIG. 9. FIG.

11 is a partial cross-sectional view in the circumferential direction of the tapered land thrust bearing of FIG.

FIG. 12 is an explanatory diagram of thermal deformation of a conventional taper land thrust bearing.

[Explanation of symbols]

1a to 1e Tapered land bearing (tapered land thrust bearing) 2a to 2e Bearing pad 3 Oil groove 4 Oil supply hole 5 Oil supply passage 6 Fixing flange 7 Bearing base 8 Oil supply pipe 9 Circumferential oil groove 10 Fixing bolt 11 Tapered part, No. 1 1 taper portion 11a second taper portion 11b third taper portion 11c fourth taper portion 11d fifth taper portion 11e recess portion 12 land portion 12a inner peripheral wall portion 12b outer peripheral wall portion 12c last end portion 13 rotating shaft 14 thrust disk 15 bearing clearance

Claims (10)

[Claims] 1. A plurality of bearing pads are provided in a circumferential direction on a bearing surface of the rotary shaft facing the thrust disk, and each of the bearing pads has an upper end between the inner peripheral wall portion and the outer peripheral wall portion which form the bearing surface. The inner peripheral wall is such that the front end is continuous with the oil groove and the bearing clearance from the oil groove to the thrust disk gradually narrows toward the rear, and the taper part is continuous with the rear end of the tapered part and is parallel to the thrust disk. In a taper land thrust bearing consisting of an upper end of the outer peripheral wall portion and a land portion forming the same plane, a part of the taper portion and the land portion is provided with a surface deeper than the taper portion and the land portion. Taper land thrust bearing. 2. The tapered land thrust bearing according to claim 1, wherein a second tapered portion that connects the rear end of the land portion and the middle of the tapered portion is provided in place of the land portion. Characteristic taper land thrust bearing. 3. The tapered land thrust bearing according to claim 2, wherein the depth of the front end of the second tapered portion is set in accordance with the amount of thermal deformation of the tapered land thrust bearing under usage conditions. Characteristic taper land thrust bearing. 4. The tapered land thrust bearing according to claim 1, wherein the tapered portion has a narrower radial width than the tapered portion in the bearing radial direction and forms a deep tapered surface with an inclination parallel to the tapered portion and the rear end is the land. A tapered land thrust bearing, characterized in that a third taper portion that enters into the portion is provided. 5. The tapered land thrust bearing according to claim 1, wherein the tapered portion has a width narrower than that of the tapered portion in the bearing radial direction and is continuous with the oil groove at the front end at the same depth as the tapered portion. A tapered land thrust bearing, wherein a fourth tapered portion having a deeper tapered surface with a gentler inclination than the portion and a rear end of which enters into the land portion is provided. 6. The tapered land thrust bearing according to claim 1, wherein a width of the tapered portion in the bearing radial direction is narrower than that of the tapered portion, and the front end is continuous with the front and rear intermediate portions of the tapered portion and is gentler than the tapered portion. A tapered land thrust bearing, wherein a tapered deep thrust surface is provided and a fifth tapered portion whose rear end is inserted into the land portion is provided. 7. The tapered land thrust bearing according to claim 6, wherein the depth of the front end of the fifth tapered portion is set in accordance with the amount of thermal deformation of the tapered land thrust bearing under usage conditions. Characteristic taper land thrust bearing. 8. The tapered land thrust bearing according to claim 1, wherein a width of the land portion in the bearing radial direction is narrower than that of the tapered portion, and a front end is continuous with a front and rear intermediate portion of the tapered portion and is parallel to the land portion. A taper land thrust bearing characterized in that a recessed portion which forms a flat surface deeper than the land portion and has a rear end forming a step portion in the land portion is provided. 9. The taper land thrust bearing according to claim 8, wherein the depth of the recess portion is set in accordance with the amount of thermal deformation under the usage conditions of the taper land thrust bearing. Thrust bearing. 10. A rotary machine comprising the taper land thrust bearing according to any one of claims 1 to 10.