CN111664171A

CN111664171A - Fluid bearing tilting pad thrust assembly and thrust bearing with same

Info

Publication number: CN111664171A
Application number: CN201910176819.6A
Authority: CN
Inventors: 俞翔栋; 刘渊; 程晓明; 李岳峰; 张健; 何柳; 丁蓉; 柴文杰; 刘逸斐
Original assignee: 711th Research Institute of CSIC
Current assignee: Shanghai Marine Diesel Engine Research Institute; 711th Research Institute of CSIC
Priority date: 2019-03-08
Filing date: 2019-03-08
Publication date: 2020-09-15

Abstract

The invention provides a fluid bearing tilting pad thrust assembly and a thrust bearing with the same. The outer peripheral surface of the thrust plate abuts against the inner surface of the case and has a first groove recessed inward from the outer peripheral surface. The supporting pins and the thrust block are arranged on the same side of the thrust disc, and the supporting pins are arranged at intervals along the circumferential direction of the thrust disc and are provided with oil injection holes communicated with the first grooves. The thrust block is limited between two adjacent support pins and is provided with a first oil guide hole. The bearing pin is arranged on the thrust block and is provided with a second oil guide hole. The bearing and pushing block is arranged on the bearing and pushing disc, and at least one of the bearing and pushing block is provided with a second groove communicated with the second oil guide hole. The thrust assembly is configured such that the lubricating oil in the first recess is injected outward via the oil injection hole and enters the second recess via the first oil guide hole and the second oil guide hole for supporting the thrust pad.

Description

Fluid bearing tilting pad thrust assembly and thrust bearing with same

Technical Field

The invention relates to the technical field of ships, in particular to a fluid bearing tilting pad thrust assembly and a thrust bearing with the same.

Background

The thrust bearing is used as a key device in a ship power system, and the main function of the thrust bearing is to transmit the thrust or the pulling force generated by a ship propeller to a ship body so as to enable the ship to advance or retreat. The thrust block is a key part of the thrust bearing and directly influences the working performance of equipment. The tiltable thrust block has the advantage of automatic adjustment along with load change, so that the tiltable thrust block is widely applied to a ship propulsion shafting.

Conventional tiltable thrust blocks use mechanical fulcrum bearings, around which the thrust block is automatically adjusted according to the hydraulic pressure distribution of its working surface. However, the adjusting range of the existing thrust block is restricted by the mechanical fulcrum, the working surface of the thrust block bears the liquid pressure, and the non-working surface of the back part has almost no pressure distribution, so that the thrust block is mechanically deformed. In addition, the thrust assembly is composed of a plurality of thrust blocks, is influenced by machining, assembling, structures, arrangement modes and the like, and thrust is difficult to be uniformly distributed among the thrust blocks.

Therefore, it is desirable to provide a thrust assembly and a thrust bearing having the same to at least partially solve the above problems.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

To at least partially solve the above-mentioned problems, according to a first aspect of the present invention, there is disclosed a thrust assembly for a thrust bearing, the thrust assembly being provided in a housing of the thrust bearing, the thrust assembly comprising:

a thrust plate, an outer peripheral surface of which abuts against an inner surface of the case, the thrust plate having a first groove recessed inward from the outer peripheral surface;

the supporting pins are arranged on the thrust plate and positioned on one side of the thrust plate, the supporting pins are arranged at intervals along the circumferential direction of the thrust plate, and the supporting pins are provided with oil injection holes communicated with the first grooves;

the thrust block and the supporting pins are positioned on the same side of the thrust bearing disc and limited between two adjacent supporting pins, and the thrust block is provided with a first oil guide hole;

the thrust bearing pin is arranged on the thrust block and is positioned on one side of the thrust block facing the thrust bearing disc, and the thrust bearing pin is provided with a second oil guide hole; and

the thrust bearing block is arranged on the thrust bearing disc and is positioned on one side, facing the thrust bearing block, of the thrust bearing disc, the positions of the thrust bearing block and the thrust bearing pin correspond to each other, and at least one of the thrust bearing block and the thrust bearing pin is provided with a second groove communicated with the second oil guide hole;

wherein the thrust assembly is configured such that the lubricating oil in the first groove is injected outward via the oil injection hole and enters the second groove via the first oil guide hole and the second oil guide hole for supporting the thrust block.

According to the thrust assembly, the fluid supports the thrust block, so that the degree of freedom of the thrust block is increased, the thrust block has a larger self-adjusting range, the mechanical deformation of the thrust block is reduced, the maintenance of the working surface of the thrust block is facilitated, the real-time monitoring of the thrust is facilitated, and the assembly of the thrust assembly is facilitated.

Optionally, the thrust pin has the second groove, and the thrust pin includes a main body portion and a protruding portion connected to the main body portion and extending in the circumferential direction, and the second groove is formed between the main body portion and the protruding portion.

Optionally, the thrust plate has a third oil guide hole extending in a radial direction, the support pin has a fifth oil guide hole communicating with the oil jet hole, and the third oil guide hole communicates the first recess with the fifth oil guide hole.

Optionally, the thrust block has a third groove for accommodating the thrust pin and a fourth groove extending inwardly from the third groove, the first oil guide hole communicating with the fourth groove.

Optionally, the fourth groove communicates with the second oil guide hole, so that the first oil guide hole communicates with the second oil guide hole.

Optionally, the thrust block has a fifth recess in which the support pin is at least partially received.

Optionally, the thrust bearing disc has a sixth groove and a seventh oil guide hole communicated with the sixth groove, the sixth groove is located on a side of the thrust bearing disc facing away from the thrust block, the thrust bearing block has an eighth oil guide hole, and the eighth oil guide hole communicates the second groove with the sixth groove.

Optionally, the thrust bearing block includes a body portion and a protrusion protruding outward from one side of the body portion, a pair of ninth grooves is provided at an outer peripheral edge of the body portion, the eighth oil guide hole is provided between the pair of ninth grooves, and a first seal ring is provided in the ninth groove to seal the eighth oil guide hole.

Optionally, the thrust assembly further comprises a thrust pad, the boss having a contact surface for contacting the thrust pad, the contact surface configured to be at least partially arcuate

Optionally, the thrust assembly further includes an adjusting ring, the thrust plate has a seventh groove located inside the sixth groove and an eighth groove located outside the sixth groove, sealing rings are respectively disposed in the seventh groove and the eighth groove, and the adjusting ring covers the outside of the thrust plate and compresses the sealing rings to seal the sixth groove.

According to a second aspect of the present invention, a thrust bearing is disclosed comprising a thrust assembly according to any of the above first aspects.

According to the thrust bearing, the fluid supports the thrust block, so that the degree of freedom of the thrust block is increased, the thrust block has a larger self-adjusting range, the mechanical deformation of the thrust block is reduced, the maintenance of the working surface of the thrust block is facilitated, the real-time monitoring of the thrust is facilitated, and the assembly of the thrust assembly is facilitated.

Optionally, the thrust bearing includes a main shaft, the main shaft includes a shaft portion and a thrust disk extending radially outward from the shaft portion, the thrust assembly is sleeved on the shaft portion and located at a side of the thrust disk, and the thrust block faces the thrust disk.

Drawings

The following drawings of embodiments of the invention are included as part of the present invention for an understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings, there is shown in the drawings,

FIG. 1 is a schematic cross-sectional view of a thrust bearing according to a preferred embodiment of the present invention;

FIG. 2 is a perspective view of the thrust assembly of FIG. 1;

FIG. 3 is a side view of the thrust assembly of FIG. 2;

FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a schematic perspective view of the thrust plate of FIG. 2, with partial regions shown in cross-section;

FIG. 6 is a perspective view of the thrust block of FIG. 2;

FIG. 7 is a perspective view of the support pin of FIG. 2 with partial areas shown in cross-section;

FIG. 8 is a schematic perspective view of the thrust pin and thrust block of FIG. 2, with partial regions shown in cross-section;

FIG. 9 is a schematic perspective view of the thrust block and thrust pin of FIG. 2;

FIG. 10 is a perspective view of the locating pin of FIG. 2 with partial regions shown in cross-section.

Description of reference numerals:

100: the thrust bearing 110: box body

120: main shaft 121: shaft body part

122: thrust disc 130: thrust assembly

140: the thrust plate 141: the first groove

142: third oil guide hole 143: the sixth groove

144: seventh oil guide hole 145: the seventh groove

146: eighth groove 150: support pin

151: the oil jet hole 152: fifth oil guide hole

160: the thrust block 161: first oil guide hole

162: third groove 163: the fourth groove

164: fifth recess 170: sales promotion pin

171: second oil guide hole 172: second groove

173: main body 174: projecting part

180: the bearing and pushing block 181: the eighth oil guide hole

182: projection 183: contact surface

184: body portion 185: ninth groove

186: first seal ring 191: adjusting ring

192: thrust pad 193: second seal ring

194: positioning pins 195: ninth oil guide hole

196: cylindrical pin 147: mounting hole

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to obscure the embodiments of the invention.

In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art.

As shown in fig. 1, the present invention provides a thrust assembly 130 and a thrust bearing 100 having the same, wherein the thrust assembly 130 is disposed in a housing 110 of the thrust bearing 100. The thrust bearing 100 includes a main shaft 120. The main shaft 120 extends through the case 110. The main shaft 120 includes a shaft portion 121 and a thrust disc 122 extending radially outward from the shaft portion 121. Specifically, the shaft body 121 extends through the case 110, and the thrust disk 122 is located in the case 110. Preferably, the thrust disk 122 is located at a substantially middle position of the shaft body portion 121 in the axial direction. The thrust disk 122 may be configured as an annular disk coaxial with the shaft body portion 121. The thrust assembly 130 is fitted over the shaft portion 121 and is located laterally to the thrust disk 122.

Thrust assembly 130 generally includes a thrust plate 140, a support pin 150, a thrust block 160, a thrust pin 170, and a thrust block 180. The thrust assembly 130 according to the present invention will be described in detail with reference to fig. 1 to 10.

As shown in fig. 1-4, the thrust plate 140 is generally configured as a semi-annular structure. The two thrust plates 140 are disposed opposite to each other to form a circular ring structure. For example, two thrust disks 140 may be connected together via a cylindrical pin 196. An outer circumferential surface of the thrust plate 140 abuts against an inner surface of the case 110, and the thrust plate 140 has a first groove 141 recessed inward from the outer circumferential surface. The first groove 141 is an annular groove that surrounds the outer circumferential surface of the thrust plate 140 by one turn, and the cross section of the first groove 141 may be U-shaped. The inner surface of the case 110 can close the opening of the first groove 141 to form a chamber for containing the lubricating oil between the inner surface of the case 110 and the first groove 141 of the thrust plate 140. A hydraulic oil pump may be provided outside the case 110 to be able to supply the lubricating oil into the chamber, i.e., the first groove 141.

The support pins 150 are provided on the thrust plate 140 at one side of the thrust plate 140, and a plurality of support pins 150 are provided at intervals in the circumferential direction of the thrust plate 140. Specifically, the thrust plate 140 has a mounting hole 147. The mounting hole 147 may be configured as a circular blind hole. One end of the support pin 150 is disposed in the mounting hole 147. The position of the mounting hole 147 may be set such that interference between the support pin 150 and the cylindrical pin 196 does not occur when the support pin 150 is mounted on the thrust plate 140. Twelve support pins 150 are exemplarily shown in the present embodiment, and the twelve support pins 150 are located on a circle centered on the center line of the thrust plate 140, and are disposed at an interval of 30 ° between adjacent two support pins 150. As shown in fig. 7, the support pin 150 may be substantially configured as a columnar stepped structure. The support pin 150 may have an oil spray hole 151 communicating with the first groove 141. The support pin 150 may have a plurality of oil spray holes 151. The oil spray hole 151 may be a circular through hole.

With continued reference to fig. 1-4, the thrust block 160 and the support pin 150 are located on the same side of the thrust plate 140 and are captured between two adjacent support pins 150. Specifically, when thrust assembly 130 is mounted on main shaft 120, thrust pads 160 face thrust disk 122 of main shaft 120. Specifically, twelve thrust pieces 160 are exemplarily shown in the present embodiment, and twelve thrust pieces 160 are located on a circle centered on the center line of the thrust plate 140, and two adjacent thrust pieces 160 are disposed at an interval of 30 °.

As shown in fig. 6, the thrust block 160 has a first oil guide hole 161. The first oil guide hole 161 is configured as a through hole extending from a high pressure bearing region of the working surface of the thrust block 160 to the other surface opposite thereto. It should be noted that, in this context, the "working surface of the thrust block 160" refers to the surface of the thrust block 160 facing away from the thrust disk 140, in other words, the surface of the thrust block 160 facing the thrust disk 122 of the main shaft 120. The thrust block 160 has a fifth groove 164, and the support pin 150 is at least partially received in the fifth groove 164. The thrust block 160 may have two fifth grooves 164. The fifth grooves 164 may be oppositely disposed on both sides of the thrust block 160 adjacent to the working surface of the thrust block 160. Two adjacent support pins 150 are received in two fifth grooves 164, in such a manner that the thrust block 160 is mounted on the thrust plate 140.

As shown in fig. 4 and 9, the thrust bearing pin 170 is disposed on the thrust block 160 and located on a side of the thrust block 160 facing the thrust bearing disk 140, and the thrust bearing pin 170 has a second oil guide hole 171. The second oil guide hole 171 communicates with the first oil guide hole 161 of the thrust block 160.

As shown in fig. 4, a thrust piece 180 is disposed on the thrust plate 140 on a side of the thrust plate 140 facing the thrust piece 160, the thrust piece 180 and the thrust pin 170 are located correspondingly, and at least one of the thrust piece 180 and the thrust pin 170 has a second groove communicating with the second oil guide hole 171. As shown in fig. 8, in the present embodiment, the ejector pin 170 has a second recess 172. The thrust pin 170 includes a main body portion 173 and a circumferentially extending projection 174 connected to the main body portion 173, with a second recess 172 being formed between the main body portion 173 and the projection 174. The body portion 173 may be configured as a disk-shaped structure. The projection 174 may be configured as an annular cylindrical structure.

In the present embodiment, the thrust assembly 130 is configured such that the lubricating oil in the first recess 141 is injected outward via the oil injection hole 151 and enters the second recess 172 via the first oil guide hole 161 and the second oil guide hole 171 for supporting the thrust pin 170 and the thrust block 160. Thrust assembly 130 according to the present disclosure, by fluidly supporting thrust block 160, increases the freedom of thrust block 160, provides a greater self-adjustment range, reduces mechanical deformation of thrust block 160, facilitates maintaining a working surface of thrust block 160, facilitates real-time thrust monitoring, and facilitates assembly of thrust assembly 130.

As shown in fig. 2, 4 and 5, the thrust plate 140 has a third oil guide hole 142 extending in a radial direction, the support pin 150 has a fifth oil guide hole 152 communicating with the oil spray hole 151, and the third oil guide hole 142 communicates the first groove 141 with the fifth oil guide hole 152. Specifically, the mounting hole 147 may communicate the third oil guide hole 142 with the fifth oil guide hole 152. Thus, the lubricating oil in the first groove 141 may enter the support pin 150 via the third oil guide hole 142 and be sprayed to the working surface of the thrust pad 160 via the oil spray hole 151 of the support pin 150, so that the lubricating oil is filled between the working surface of the thrust pad 160 and the surface of the thrust disk 122, and a dynamic pressure oil film will be formed on the working surface of the thrust pad 160 when the main shaft 120 rotates. In the present embodiment, the number of the third oil guide holes 142 corresponds to the number of the thrust pads 160.

As shown in fig. 6 and 9, the thrust block 160 has a third recess 162 for receiving the thrust pin 170 and a fourth recess 163 extending inwardly from the third recess 162, and the first oil guide hole 161 communicates with the fourth recess 163. The fourth recess 163 communicates with the second oil guide hole 171 such that the first oil guide hole 161 communicates with the second oil guide hole 171. A thrust pin 170 is disposed in the third recess 162 for mounting on the thrust block 160. In the present embodiment, the first oil guide hole 161 is located at the center of the fourth groove 163, and is offset from the center of the third groove 162. The fourth recess 163 serves to buffer the lubricating oil. Preferably, the first oil guide hole 161 is located at a high pressure bearing area on the working surface of the thrust block 160. The lubricating oil on the working surface of the thrust block 160 may sequentially enter the second oil guide hole 171 and the second groove 172 of the thrust bearing pin 170 through the first oil guide hole 161, the fourth groove 163 and the third groove 162 of the thrust block 160 to store a certain amount of lubricating oil in the second groove 172, forming a static pressure oil film.

As shown in fig. 4 and 5, the thrust plate 140 has a sixth groove 143 and a seventh oil guide hole 144 communicating with the sixth groove 143, and the sixth groove 143 is located on a side of the thrust plate 140 facing away from the thrust block 160. The sixth groove 143 is an annular groove around the central axis of the thrust plate 140. The thrust bearing block 180 has an eighth oil guide hole 181, and the eighth oil guide hole 181 communicates the second groove 172 with the sixth groove 143 such that the lubricating oil of the second groove 172 can enter the sixth groove 143 via the eighth oil guide hole 181 and the seventh oil guide hole 144 in order. Since the sixth groove 143 communicates with each second groove 172, the oil pressure of the lubricating oil in each second groove 172 can be adjusted in an interlocking manner, so that the thrust force received by each thrust block 160 is substantially equal.

Thrust assembly 130 also includes an adjustment ring 191. The adjustment ring 191 is constructed as two semi-annular disk structures that together form a circular disk structure. The thrust plate 140 has a seventh groove located inside the sixth groove 143 and an eighth groove 146 located outside the sixth groove 143. The seventh groove 145 and the eighth groove 146 may each be configured as an annular groove around the central axis of the thrust plate 140. The seventh groove 145 and the eighth groove 146 are respectively provided with a second sealing ring 193, and the adjusting ring 191 covers the outer side of the thrust plate 140 and presses the second sealing ring 193 to seal the sixth groove 143. The second seal 193 may be an O-ring seal. The thickness of adjustment ring 191 is adjusted via a finishing process to adjust the axial dimension (e.g., axial thickness) of thrust assembly 130.

Thrust assembly 130 also includes a thrust pad 192, as shown in FIG. 4. The thrust pad 192 may be configured as a circular disk-like structure. The projection 182 has a contact surface 183 for contact with the thrust pad 192, the contact surface 183 being configured as an at least partially arcuate surface. Preferably, the contact surface 183 is constructed as a spherical surface.

The operation of thrust assembly 130 of the present invention will now be described in detail. When the thrust assembly 130 is operated, a dynamic pressure oil film is formed on the working surface of the thrust block 160, wherein a small amount of high pressure oil enters the second groove 172 of the thrust bearing pin 170 through the first oil guide hole 161 to fill the second groove 172 with lubricating oil to form a static pressure oil film. At this time, the working surface of the thrust block 160 is a dynamic pressure oil film formed by dynamic pressure lubrication, and the back surface of the thrust block 160 is a static pressure oil film formed by introducing partial lubricating oil in a high pressure area of the dynamic pressure oil film into the second groove 172, because the bearing capacity of the static pressure oil film on the back surface of the thrust block 160 is greater than that of the dynamic pressure oil film on the working surface, and the acting directions are opposite, the thrust block 160 and the thrust bearing pin 170 are in a floating state under the support of the static pressure oil film. The high-pressure lubricating oil in the second groove 172 generates a small amount of leakage, so that the oil film pressure in the second groove 172 is reduced, and the oil pressures on the two sides of the thrust block 160 are balanced. According to the pressure distribution of the hydrodynamic oil film received by the working surface of the thrust pad 160, the thrust pad 180 and the thrust pad 192 form a certain inclination angle to adjust the inclination angle of the working surface of the thrust pad 160. In addition, the high-pressure lubricating oil in the second grooves 172 is gathered into the sixth grooves 143 through the eighth oil guide hole 181 of the thrust block 180 and the seventh oil guide hole of the thrust disc 140, so that the respective second grooves 172 are communicated with each other. The linkage adjustment of the oil film pressure in each second groove 172 is realized, and pressure compensation is formed, so that the thrust borne by each thrust block 160 is basically equal.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "disposed" and the like, as used herein, may refer to one element being directly attached to another element or one element being attached to another element through intervening elements. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the scope of the described embodiments. It will be appreciated by those skilled in the art that many variations and modifications may be made to the teachings of the invention, which fall within the scope of the invention as claimed.

Claims

1. A fluid bearing tilting pad thrust assembly for a thrust bearing, said thrust assembly being disposed in a housing of the thrust bearing, said thrust assembly comprising:

2. The thrust assembly of claim 1, wherein said thrust pin has said second recess, said thrust pin including a body portion and a circumferentially extending projection connected to said body portion, said body portion and said projection defining said second recess therebetween.

3. The thrust assembly of claim 1, wherein the thrust disk has a third oil guide hole extending in a radial direction, the support pin has a fifth oil guide hole communicating with the oil jet hole, and the third oil guide hole communicates the first recess with the fifth oil guide hole.

4. The thrust assembly of claim 1, wherein said thrust block has a third recess for receiving said thrust pin and a fourth recess extending inwardly from said third recess, said first oil guide bore communicating with said fourth recess.

5. The thrust assembly of claim 4, wherein the fourth groove communicates with the second oil guide hole such that the first oil guide hole communicates with the second oil guide hole.

6. The thrust assembly of claim 1, wherein said thrust block has a fifth recess, said support pin being at least partially received in said fifth recess.

7. The thrust assembly of claim 1, wherein the thrust disk has a sixth recess and a seventh oil guide hole in communication with the sixth recess, the sixth recess being located on a side of the thrust disk facing away from the thrust block, the thrust block having an eighth oil guide hole communicating the second recess with the sixth recess.

8. The thrust assembly of claim 7, wherein the thrust bearing block includes a body portion and a protrusion protruding outward from one side of the body portion, a peripheral edge of the body portion is provided with a pair of ninth grooves, the eighth oil guide hole is provided between the pair of ninth grooves, and the ninth groove is provided with a first seal ring therein to seal the eighth oil guide hole.

9. The thrust assembly of claim 8, further comprising a thrust pad, wherein said boss has a contact surface for contacting said thrust pad, said contact surface configured to be at least partially arcuate.

10. The thrust assembly of claim 7, further comprising an adjustment ring, wherein the thrust disk has a seventh groove located inside the sixth groove and an eighth groove located outside the sixth groove, wherein a second seal ring is disposed in each of the seventh groove and the eighth groove, and wherein the adjustment ring covers the outside of the thrust disk and compresses the second seal ring to seal the sixth groove.

11. A thrust bearing, comprising a thrust assembly according to any of claims 1 to 10.

12. The thrust bearing of claim 11, wherein the thrust bearing includes a main shaft including a shaft portion and a thrust disk extending radially outward from the shaft portion, the thrust assembly is sleeved on the shaft portion and is positioned to the side of the thrust disk, and the thrust block faces the thrust disk.