CN115111345A

CN115111345A - Wind power speed-increasing gear box of radial/thrust sliding bearing combined supporting structure

Info

Publication number: CN115111345A
Application number: CN202211002494.8A
Authority: CN
Inventors: 张帆; 杨晋; 王建梅; 胡志建; 李振华; 吉宏斌
Original assignee: Taiyuan University of Science and Technology
Current assignee: Taiyuan University of Science and Technology
Priority date: 2022-08-22
Filing date: 2022-08-22
Publication date: 2022-09-27
Anticipated expiration: 2042-08-22
Also published as: CN115111345B

Abstract

The invention discloses a wind power speed-up gearbox with a radial/thrust sliding bearing combined supporting structure, aiming at a three-stage planetary gearbox in the technical field of wind power gearboxes, and the wind power speed-up gearbox comprises four radial/thrust sliding bearing combined supporting bodies, wherein a first radial/thrust sliding bearing combined supporting body is arranged in an inner hole and two sides of a first-stage planetary gear, a second radial/thrust sliding bearing combined supporting body is arranged in an inner hole and two sides of a second-stage planetary gear, a third radial/thrust sliding bearing combined supporting body is arranged in an inner hole and two sides of a third-stage planetary gear, and a fourth radial/thrust sliding bearing combined supporting body is arranged in a box body and is positioned at two ends of a driving gear shaft. The invention can improve the torque density and the bearing reliability of the gear box, effectively reduce the space of the gear box and reduce the maintenance cost of the wind power gear box.

Description

Wind power speed-up gear box with radial/thrust sliding bearing combined supporting structure

Technical Field

The invention relates to the technical field of wind power gear boxes, in particular to a wind power speed-up gear box with a radial/thrust sliding bearing combined supporting structure.

Background

The description of the background of the invention pertaining to the related art to which this invention pertains is given for the purpose of illustration and understanding only of the summary of the invention and is not to be construed as an admission that the applicant is explicitly or implicitly admitted to be prior art to the date of filing this application as first filed with this invention.

The existing wind driven generator gearbox shafting support bearing mainly adopts a rolling bearing, but the rolling bearing is in a point and line contact mode, has limited bearing capacity and is easy to slip, wear and lose efficacy under specific working conditions. With the development of wind generating sets towards high power and large size, extremely high requirements are put forward on the service reliability and economy of wind power gear boxes, and the contradiction between the characteristics of large size, limited bearing capacity and easy failure of rolling bearings and the reliability and economy required by the wind generating sets is more and more prominent. The sliding bearing is in a surface contact form, has the advantages of high bearing density, long service life due to liquid lubrication and the like, can improve the torque density and bearing reliability of the gear box, and reduces the maintenance cost of the wind power gear box; meanwhile, the sliding bearing is simple in structure, the space of the gear box can be effectively reduced, and the weight of the gear box is reduced. Therefore, part of unit researches use sliding bearings to replace rolling bearings in wind power gear boxes, but mainly aim at a one-stage planetary two-stage parallel shaft gear box. For a two-stage planet one-stage parallel shaft gearbox and a three-stage planet two-stage parallel shaft gearbox used for high-power wind power, a sliding bearing supporting scheme becomes a research hotspot, but a gear box scheme supported by a sliding bearing does not exist.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides a wind power speed-up gear box with a radial/thrust sliding bearing combined supporting structure, so that the torque density and the bearing reliability of the high-power wind power speed-up gear box are improved, and the volume of the gear box is reduced.

The technical scheme for solving the technical problems is as follows:

a wind power speed-up gear box of a radial/thrust sliding bearing combined supporting structure comprises a first radial/thrust sliding bearing combined supporting body and a second radial/thrust sliding bearing combined supporting body which are used for bearing radial force and axial force of a gear box system, the first radial/thrust sliding bearing combination supporting body is arranged in the inner hole and two sides of the primary planetary gear, the second radial/thrust sliding bearing combination supporting body is arranged in the inner hole and two sides of the secondary planetary gear, the third radial/thrust sliding bearing combination supporting body is arranged in the inner hole and two sides of the tertiary planetary gear, and the fourth radial/thrust sliding bearing combination supporting body is arranged in the box body and the end cover body and located at two ends of the driving gear shaft.

Further, the first combined radial/thrust sliding bearing support body is composed of a first radial sliding bearing, a first thrust sliding bearing, and a second thrust sliding bearing. The first radial sliding bearing is assembled in an inner hole of the first-stage planetary gear and bears radial force generated in the working process of the first-stage planetary gear; the first thrust sliding bearing is arranged on the left end face of the first-stage planetary gear and forms a sliding friction pair with a first thrust disc arranged on a first-stage planetary pin shaft, the second thrust sliding bearing is arranged on the right end face of the first-stage planetary gear and forms a sliding friction pair with a second thrust disc, the second thrust disc is arranged on the left side of a first-stage right planet carrier, and the first thrust sliding bearing and the second thrust sliding bearing bear the axial force generated in the working process of the first-stage planetary gear together.

Further, the second combined radial/thrust sliding bearing support body is composed of a second radial sliding bearing, a third thrust sliding bearing, and a fourth thrust sliding bearing. The second radial sliding bearing is assembled in an inner hole of the secondary planetary gear and bears radial force generated in the working process of the secondary planetary gear; the third thrust sliding bearing is arranged on the left end face of the secondary planetary gear and forms a sliding friction pair with a third thrust disc arranged on a secondary planetary pin shaft, the fourth thrust sliding bearing is arranged on the right end face of the secondary planetary gear and forms a sliding friction pair with the fourth thrust disc, the fourth thrust disc is arranged on the left side of a secondary right planet carrier, and the third thrust sliding bearing and the fourth thrust sliding bearing bear the axial force generated in the working process of the secondary planetary gear together.

Further, the third combined radial/thrust sliding bearing support body is composed of a third radial sliding bearing, a fifth thrust sliding bearing, and a sixth thrust sliding bearing. The third radial sliding bearing is assembled in an inner hole of the third-stage planetary gear and bears radial force generated in the working process of the third-stage planetary gear; the fifth thrust sliding bearing is installed on the left end face of the third-stage planetary gear and forms a sliding friction pair with a fifth thrust disc installed on a third-stage planetary pin shaft, the sixth thrust sliding bearing is installed on the right end face of the third-stage planetary gear and forms a sliding friction pair with the sixth thrust disc, the sixth thrust disc is installed on the left side of the third-stage right planet carrier, and the fifth thrust sliding bearing and the sixth thrust sliding bearing bear axial force generated in the working process of the third-stage planetary gear together.

Further, the fourth combined radial/thrust sliding bearing support body is composed of a fourth radial sliding bearing, a fifth radial sliding bearing, a seventh thrust sliding bearing, and an eighth thrust sliding bearing. The fourth radial sliding bearing is assembled in an inner hole of the box body, the fifth radial sliding bearing is assembled in an inner hole of the end cover body, and the fourth radial sliding bearing and the fifth radial sliding bearing support the driving gear shaft together and bear radial force generated in the working process of the driving gear; the seventh thrust sliding bearing is installed on the right side of the box body and is close to the fourth radial sliding bearing, the eighth thrust sliding bearing is installed on the left side of the end cover body and is close to the fifth radial sliding bearing, and the seventh thrust sliding bearing, the eighth thrust sliding bearing and the left and right shaft shoulder end faces of the driving gear shaft respectively form a sliding friction pair to bear the axial force generated in the working process of the driving gear.

Furthermore, the first thrust sliding bearing, the second thrust sliding bearing, the third thrust sliding bearing, the fourth thrust sliding bearing, the fifth thrust sliding bearing, the sixth thrust sliding bearing, the seventh thrust sliding bearing and the eighth thrust sliding bearing are tilting pad thrust bearings, and tilting pads are fan-shaped thrust pads or circular thrust pads and are supported by an elastic supporting structure.

Further, the numbers of the pads of the first thrust sliding bearing, the second thrust sliding bearing, the third thrust sliding bearing, the fourth thrust sliding bearing, the fifth thrust sliding bearing, the sixth thrust sliding bearing, the seventh thrust sliding bearing and the eighth thrust sliding bearing are all 8 to 30.

The invention has the beneficial effects that:

the invention adopts a sliding bearing to replace a rolling bearing, and provides a radial/thrust sliding bearing combined structure for realizing the support of a rotor system of a wind power three-level planetary speed-increasing gearbox. Compared with the point and line supporting characteristics of a rolling bearing, the radial sliding bearing is a surface supporting friction pair, has larger bearing area and lower bearing specific pressure in function, can effectively improve the bearing capacity of a gearbox system and prolong the service life of the bearing friction pair; structurally, compared with a large-size structure formed by an inner ring, an outer ring, a retainer, a bearing cylinder and the like of the rolling bearing, the radial sliding bearing is of a cylindrical thin-wall structure, has smaller size space and lighter weight, and can effectively improve the torque density of the gear box. The axial thrust bearing adopts a plurality of independent pads and an elastic supporting structure, the supporting mode can effectively bear the axial force generated by the gear box rotor in the rotating process, and simultaneously, the elastic supporting structure can make each pad self-adaptively and uniformly bear when the gear box rotor generates torque and inclines; the characteristic that each thrust pad is independently installed can lead the pad to be conveniently replaced after a certain service time; the thrust disc is arranged on the planet pin shaft or the planet carrier, so that axial bearing is realized, and the axial size and weight are not increased. The radial/thrust sliding bearing combined supporting structure of the wind power gear box can realize the integration of bearing and transmission power, effectively reduce the space of the gear box, reduce the weight of the gear box, improve the bearing reliability of the gear box and reduce the maintenance cost of the wind power gear box.

Drawings

Fig. 1 is a schematic structural view of a wind power speed-up gear box of a radial/thrust sliding bearing combined supporting structure of the invention.

Fig. 2 is an operational schematic diagram of a combined radial/thrust sliding bearing support device according to the present invention.

Fig. 3 is a schematic view of a thrust sliding bearing mounting structure of the present invention.

Fig. 4 is a view showing a circumferential arrangement structure of the thrust sliding bearing (circular thrust pad) of the present invention.

Fig. 5 is a view showing a construction of a circumferential arrangement of another thrust sliding bearing (segmental thrust pad) of the present invention.

In the figure: 1-a box body; 2-end cover body; 211-primary annulus gear; 212-first stage right planet carrier; 213-input planet carrier; 214-primary sun gear; 215-primary planetary gear; 216-first stage planetary pin; 217-a first thrust disc; 218-a second thrust disc; 221-a secondary ring gear; 222-a secondary right planet carrier; 223-a secondary sun gear; 224-a secondary planetary gear; 225-two-stage planet pin; 226-a third thrust disc; 227-a fourth thrust disc; 231-a tertiary ring gear; 232-three-stage left planet carrier; 233-third level right planet carrier; 234-tertiary sun gear; 235-three-stage planetary gear; 236-three-level planet pin shaft; 237-fifth thrust disk; 238-a sixth thrust disc; 3-a resilient support structure; 31-driving gear shaft; 32-a drive gear; 33-a driven gear; 34-an output shaft; 411-a first radial plain bearing; 412-a second radial plain bearing; 413-a third radial plain bearing; 414-a fourth radial plain bearing; 415-a fifth radial plain bearing; 421-a first thrust sliding bearing; 422-a second thrust sliding bearing; 423-third thrust sliding bearing; 424-a fourth thrust sliding bearing; 425-a fifth thrust sliding bearing; 426-a sixth thrust sliding bearing; 427-a seventh thrust sliding bearing; 428-eighth thrust sliding bearing; 51-a first drive shaft; 52-second drive shaft.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1 to 3, a wind turbine speed increasing gear box of a radial/thrust sliding bearing combination supporting structure comprises a first radial/thrust sliding bearing combination supporting body and a second radial/thrust sliding bearing combination supporting body for bearing radial force and axial force, a third radial/thrust sliding bearing combined support body installed in the inner hole and both sides of the primary planetary gear 215, and a fourth radial/thrust sliding bearing combined support body installed in the case body 1 and the end cover body 2 and located at both ends of the driving gear shaft 31, the first radial/thrust sliding bearing combined support body being installed in the inner hole and both sides of the primary planetary gear 215, the second radial/thrust sliding bearing combined support body being installed in the inner hole and both sides of the secondary planetary gear 224, the third radial/thrust sliding bearing combined support body being installed in the inner hole and both sides of the tertiary planetary gear 235. The first radial/thrust sliding bearing combination bearing body, the second radial/thrust sliding bearing combination bearing body and the third radial/thrust sliding bearing combination bearing body are respectively used for bearing the radial force and the axial force generated in the working process of the corresponding planetary gear, and the fourth radial/thrust sliding bearing combination bearing body is used for bearing the radial force and the axial force generated in the working process of the driving gear 32. The radial/thrust sliding bearing combined supporting device of the wind power gear box can realize the integration of bearing and transmitting power, effectively reduce the space of the gear box and reduce the weight of the gear box.

The first combined radial/thrust sliding bearing support is comprised of a first radial sliding bearing 411, a first thrust sliding bearing 421 and a second thrust sliding bearing 422. The first radial sliding bearing 411 is assembled in an inner hole of the primary planet gear 215 and bears radial force generated in the working process of the primary planet gear 215; the first thrust sliding bearing 421 is installed on the left end surface of the primary planetary gear 215, and forms a sliding friction pair with the first thrust disc 217 installed on the primary planetary pin 216; the second thrust sliding bearing 422 is installed on the right end surface of the primary planet gear 215 and forms a sliding friction pair with the second thrust disc 218, and the second thrust disc 218 is installed on the left side of the primary right planet carrier 212; the first thrust sliding bearing 421 and the second thrust sliding bearing 422 bear the axial force generated during the operation of the primary planetary gear 215 together.

The second combined radial/thrust slide bearing support is comprised of second radial slide bearing 412, third thrust slide bearing 423, and fourth thrust slide bearing 424. The second radial sliding bearing 412 is assembled in the inner hole of the secondary planet gear 224 and bears radial force generated in the working process of the secondary planet gear 224; a third thrust sliding bearing 423 is installed on the left end surface of the secondary planet gear 224, and forms a sliding friction pair with a third thrust disc 226 installed on the secondary planet pin 225; a fourth thrust sliding bearing 424 is mounted on the right end face of the secondary planet gear 224 and forms a sliding friction pair with a fourth thrust disc 227, and the fourth thrust disc 227 is mounted on the left side of the secondary right planet carrier 222; third thrust sliding bearing 423 and fourth thrust sliding bearing 424 together receive axial forces generated during operation of secondary planetary gear 224.

The third combined radial/thrust sliding bearing support is comprised of a third radial sliding bearing 413, a fifth thrust sliding bearing 425, and a sixth thrust sliding bearing 426. The third radial sliding bearing 413 is assembled in an inner hole of the third-stage planetary gear 235 and bears radial force generated in the working process of the third-stage planetary gear 235; a fifth thrust sliding bearing 425 is arranged on the left end surface of the third-stage planetary gear 235 and forms a sliding friction pair with a fifth thrust disc 237 arranged on the third-stage planetary pin shaft 236; a sixth thrust sliding bearing 426 is installed on the right end face of the third-stage planetary gear 235 and forms a sliding friction pair with a sixth thrust disc 238, and the sixth thrust disc 238 is installed on the left side of the third-stage right carrier 233; fifth thrust slide bearing 425 and sixth thrust slide bearing 426 collectively receive axial forces generated during operation of third stage planetary gear 235.

The fourth combined radial/thrust sliding bearing support is comprised of a fourth radial sliding bearing 414, a fifth radial sliding bearing 415, a seventh thrust sliding bearing 427, and an eighth thrust sliding bearing 428. The fourth radial sliding bearing 414 is assembled in the inner hole of the box body 1, the fifth radial sliding bearing 415 is assembled in the inner hole of the end cover body 2, and the fourth radial sliding bearing 414 and the fifth radial sliding bearing 415 bear the radial force generated in the working process of the driving gear 32 together; the seventh thrust sliding bearing 427 is installed on the right side of the housing 1 and close to the fourth radial sliding bearing 414, the eighth thrust sliding bearing 428 is installed on the left side of the end cover body 2 and close to the fifth radial sliding bearing 415, and the seventh thrust sliding bearing 427, the eighth thrust sliding bearing 428 and the left and right shaft shoulder end surfaces of the driving gear shaft 31 respectively form a sliding friction pair to jointly bear the axial force generated in the working process of the driving gear 32.

As shown in fig. 4 and 5, fig. 4 and 5 in the present embodiment are based on first thrust sliding bearing 421 as a reference, and second thrust sliding bearing 422, third thrust sliding bearing 423, fourth thrust sliding bearing 424, fifth thrust sliding bearing 425, sixth thrust sliding bearing 426, seventh thrust sliding bearing 427, and eighth thrust sliding bearing 428 in the present embodiment are each of the structures shown in fig. 4 and 5. The thrust sliding bearings are tilting pad thrust bearings, tilting pads are fan-shaped thrust pads or circular thrust pads, and the number of the thrust pads is 8-30. The thrust sliding bearing adopts a plurality of independent pads and elastic support structure 3, and elastic support structure 3 can effectively bear the axial force that the gear box rotor produced at the rotatory in-process, and elastic support structure 3 can make each thrust pad self-adaptation evenly bear when the gear box rotor produces moment of torsion and slope simultaneously, and the characteristics of each thrust pad independent installation can make the pad conveniently change after certain time of service.

The working principle and the process of the invention are as follows:

the input planet carrier 213 is an input driving part of the whole gear box, the first-stage planet pin 216 is arranged on the input planet carrier 213 and the first-stage right planet carrier 212, under the action of the input torque Tin of the gear box, the input planet carrier 213 rotates and drives the first-stage planet pin 216 to rotate, the first-stage planet gear 215 takes the first-stage planet pin 216 as a self-rotating central shaft and is meshed with the first-stage inner gear ring 211 to rotate, and meanwhile, the first-stage sun gear 214 is driven to rotate. Radial force generated in the process of meshing rotation of the primary planetary gear 215 and the primary annular gear 211 is borne by dynamic pressure oil film force generated by the first radial sliding bearing 411, and axial force generated in the process of meshing rotation of the primary planetary gear 215 and the primary annular gear 211 is borne by the dynamic pressure oil film force generated by the first thrust sliding bearing 421 and the second thrust sliding bearing 422 and the dynamic pressure oil film force generated by the first thrust disc 217 and the second thrust disc 218 respectively.

The secondary ring gear 221 is coupled to and rotates together with the primary planet pin 216 through the primary right planet carrier 212, the secondary planet pin 225 is mounted on the fixed secondary right planet carrier 222, and the secondary planet gear 224 rotates with the secondary planet pin 225 as a center axis of rotation and is engaged with the secondary ring gear 221, and drives the secondary sun gear 223 to rotate. Radial force generated during the meshing rotation of secondary planetary gear 224 and secondary ring gear 221 is received by dynamic oil film force generated by second radial sliding bearing 412, and axial force generated during the meshing rotation of secondary planetary gear 224 and secondary ring gear 221 is received by third thrust sliding bearing 423 and fourth thrust sliding bearing 424 together with dynamic oil film force generated by third thrust disc 226 and fourth thrust disc 227, respectively.

The third-stage ring gear 231 is connected with the second-stage sun gear 223, the third-stage left planet carrier 232 is connected with the first-stage sun gear 214 through the first transmission shaft 51, the third-stage ring gear 231 and the third-stage left planet carrier 232 form a differential drive structure, the third-stage planet pin shaft 236 is installed on the third-stage left planet carrier 232 and the third-stage right planet carrier 233, the third-stage planet gear 235 takes the third-stage planet pin shaft 236 as a self-rotating central shaft and rotates under the combined differential action of the third-stage ring gear 231 and the third-stage left planet carrier 232, and meanwhile, the third-stage sun gear 234 is driven to rotate. The radial force generated by the third-stage planetary gears 235 during rotation is received by the hydrodynamic oil film force generated by the third radial plain bearing 413, and the axial force generated by the third-stage planetary gears 235 during rotation is received by the fifth thrust plain bearing 425 and the sixth thrust plain bearing 426 in cooperation with the hydrodynamic oil film force generated by the fifth thrust disk 237 and the sixth thrust disk 238, respectively.

The third-stage sun gear 234 rotates the driving gear 32 through the second transmission shaft 52 and the driving gear shaft 31, and the driving gear 32 is meshed with the driven gear 33 and drives the output shaft 34 to rotate to output the torque Tout. Radial force generated in the meshing transmission process of the driving gear 32 and the driven gear 33 is received by dynamic oil film force generated by the fourth radial sliding bearing 414 and the fifth radial sliding bearing 415, and axial force generated in the meshing transmission process of the driving gear 32 and the driven gear 33 is received by the seventh thrust sliding bearing 427 and the eighth thrust sliding bearing 428 together with dynamic oil film force generated by the left and right shoulder end surfaces of the driving gear shaft 31.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a wind-powered electricity generation step-up gear box of radial/thrust sliding bearing combination bearing structure which characterized in that: comprising a first combined radial/thrust sliding bearing support, a second combined radial/thrust sliding bearing support, a third combined radial/thrust sliding bearing support and a fourth combined radial/thrust sliding bearing support for receiving radial and axial forces of the gearbox system, the first radial/thrust sliding bearing combined bearing body is arranged in an inner hole and two sides of the first-stage planet gear (215), the second radial/thrust sliding bearing combined supporting body is arranged in an inner hole and on two sides of the secondary planet gear (224), the third radial/thrust sliding bearing combined supporting body is arranged in an inner hole and on two sides of the three-stage planetary gear (235), and the fourth radial/thrust sliding bearing combined supporting bodies are installed in the box body (1) and the end cover body (2) and are positioned at two ends of the driving gear shaft (31).

2. The wind-powered speed-increasing gear box with a radial/thrust sliding bearing combination supporting structure according to claim 1, wherein: the first radial/thrust sliding bearing combined supporting body is composed of a first radial sliding bearing (411), a first thrust sliding bearing (421) and a second thrust sliding bearing (422), the first radial sliding bearing (411) is assembled in an inner hole of the primary planet gear (215), the first thrust sliding bearing (421) is installed on the left end face of the primary planet gear (215) and forms a sliding friction pair with a first thrust disc (217) installed on a primary planet pin shaft (216), the second thrust sliding bearing (422) is installed on the right end face of the primary planet gear (215) and forms a sliding friction pair with a second thrust disc (218), and the second thrust disc (218) is installed on the left side of the primary right planet carrier (212).

3. The wind-powered speed-increasing gear box with a radial/thrust sliding bearing combination supporting structure according to claim 2, wherein: the second radial/thrust sliding bearing combined supporting body is composed of a second radial sliding bearing (412), a third thrust sliding bearing (423) and a fourth thrust sliding bearing (424), the second radial sliding bearing (412) is assembled in an inner hole of the secondary planet gear (224), the third thrust sliding bearing (423) is installed on the left end face of the secondary planet gear (224) and forms a sliding friction pair with a third thrust disc (226) installed on a secondary planet pin shaft (225), the fourth thrust sliding bearing (424) is installed on the right end face of the secondary planet gear (224) and forms a sliding friction pair with a fourth thrust disc (227), and the fourth thrust disc (227) is installed on the left side of the secondary right planet carrier (222).

4. A wind power speed increasing gear box with a radial/thrust sliding bearing combined supporting structure according to claim 3, characterized in that: the third combined radial/thrust plain bearing support is composed of a third radial plain bearing (413), a fifth thrust plain bearing (425) and a sixth thrust plain bearing (426); the third radial sliding bearing (413) is assembled in an inner hole of the third-stage planetary gear (235), the fifth thrust sliding bearing (425) is installed on the left end face of the third-stage planetary gear (235) and forms a sliding friction pair with a fifth thrust disc (237) installed on a third-stage planetary pin shaft (236), the sixth thrust sliding bearing (426) is installed on the right end face of the third-stage planetary gear (235) and forms a sliding friction pair with a sixth thrust disc (238), and the sixth thrust disc (238) is installed on the left side of the third-stage right planet carrier (233).

5. The wind power speed increasing gear box of a radial/thrust sliding bearing combination supporting structure according to claim 4, wherein: the fourth radial/thrust sliding bearing combined bearing body consists of a fourth radial sliding bearing (414), a fifth radial sliding bearing (415), a seventh thrust sliding bearing (427) and an eighth thrust sliding bearing (428), the fourth radial sliding bearing (414) is assembled in the inner hole of the box body (1), the fifth radial sliding bearing (415) is assembled in the inner hole of the end cover body (2), the seventh thrust sliding bearing (427) is installed at the right side of the box body (1) and close to the fourth radial sliding bearing (414), the eighth thrust sliding bearing (428) is installed at the left side of the end cover body (2) and close to the fifth radial sliding bearing (415), and the seventh thrust sliding bearing (427) and the eighth thrust sliding bearing (428) respectively form sliding friction pairs with the left and right shoulder end surfaces of the driving gear shaft (31).

6. The wind power speed-up gear box of a radial/thrust sliding bearing combination bearing structure according to claim 5, wherein: the first thrust sliding bearing (421), the second thrust sliding bearing (422), the third thrust sliding bearing (423), the fourth thrust sliding bearing (424), the fifth thrust sliding bearing (425), the sixth thrust sliding bearing (426), the seventh thrust sliding bearing (427) and the eighth thrust sliding bearing (428) are tilting pad thrust bearings, and tilting pads are fan-shaped thrust pads or circular thrust pads and are supported by an elastic supporting structure (3).

7. The wind power speed-up gear box of a radial/thrust sliding bearing combination bearing structure according to claim 6, wherein: the number of the pads of the first thrust sliding bearing (421), the second thrust sliding bearing (422), the third thrust sliding bearing (423), the fourth thrust sliding bearing (424), the fifth thrust sliding bearing (425), the sixth thrust sliding bearing (426), the seventh thrust sliding bearing (427) and the eighth thrust sliding bearing (428) is 8 to 30.