CN-117108632-B - Novel oil cavity indent type static and dynamic pressure thrust bearing

Abstract

The utility model provides a novel oil pocket indent static and dynamic pressure thrust bearing, along with the development of high-speed heavy-duty cutting technique, heavy equipment is gradually towards high-speed heavy-duty direction development, we are also higher to static and dynamic pressure thrust bearing's performance requirement, but along with the increase of rotational speed and load, the lubricating oil film is because receiving shearing force and extrusion effect, shearing heating increases, the oil film attenuation, can take place tribology inefficacy phenomenon even in part, and the bearing leads to the lubricating oil to leak because local temperature overheat causes the deformation, and lubricating oil viscosity drops, can produce static pressure loss, therefore, this patent proposes a novel oil pocket indent static and dynamic pressure thrust bearing, make the static and dynamic pressure thrust bearing during operation, always produce wedge clearance between oil pocket and the swivel work head guide surface, satisfy the condition that produces dynamic pressure effect under swivel work head high-speed rotation, utilize dynamic pressure effect, compensate static pressure bearing capacity's loss through dynamic pressure, thereby reach the purpose that improves bearing capacity and stability.

Inventors

• YU XIAODONG
• LI RUICHAO
• SUN KAIXUAN
• ZHAO FEIHU
• JIA WENTAO
• GENG ZHENKUN
• DAI RUICHUN
• GAO DAWEI
• LIU HAIXIN
• WANG YIHAN
• GUAN LIBO

Assignees

• 哈尔滨理工大学

Dates

Publication Date

20260508

Application Date

20230624

Claims (2)

1. 1. The oil cavity concave type static and dynamic pressure thrust bearing is characterized by comprising a rotary workbench (1), an oil cavity (3), an oil pad (4), a base (5) and an oil film (2) formed between the oil cavity (3) and a guide surface (6) of the workbench, wherein the oil cavity (3) is integrally concave, the total thickness of the oil pad (4) is 50mm, an oil sealing edge (9) on the oil pad (4) is in a runway shape, the inside of the oil pad (4) is an oil cavity formed by a runway-shaped cavity with the upper side being 3mm thick and a runway-shaped bottom with the lower side being 5mm concave, the bottom is provided with an oil inlet (7), the oil cavity of the bearing is in an inclined shape, the depth of the oil pad is shallow, the height of a concave plane is close to the height of the oil sealing edge, and the inside of the oil cavity is concave compared with the plane inside the oil cavity of a common static pressure bearing, and the area of the concave surface is larger.
2. 2. The oil cavity indent static and dynamic pressure thrust bearing is characterized by comprising a rotary workbench (1), an oil cavity (3), an oil pad (4), a base (5) and an oil film (2) formed between the oil cavity (3) and a guide surface (6) of the workbench, wherein the oil cavity (3) is integrally indent, the total thickness of the oil pad (4) is 50mm, an oil sealing edge (12) on the oil pad (4) is runway-shaped, the inside of the oil pad (4) is runway-shaped bottom, the bottom is indent-shaped with the height of 8mm and is formed by a cylindrical oil inlet hole (10), when the rotary workbench is placed on the oil pad, a load is placed on the workbench, oil enters the oil cavity (3) from the oil inlet through the oil pump, the rotary workbench (1) is lifted up due to the action of liquid resistance, and the lubricating film (2) is formed between the guide surface (6) of the workbench and the oil cavity (3).

Description

Novel oil cavity indent type static and dynamic pressure thrust bearing Technical Field The invention relates to a novel oil cavity concave type static and dynamic pressure thrust bearing. Background The hydrostatic thrust bearing has the characteristics of high precision, long service life, good stability and the like, and becomes a core component of large-scale numerical control equipment in the important national fields of aerospace, heavy machinery, ship manufacturing, national defense and the like. Along with the development of high-speed heavy-duty cutting technology, heavy equipment gradually develops towards the high-speed heavy-duty direction, we are higher and higher to hydrostatic thrust bearing's performance requirement, but along with the increase of rotational speed and load, lubricating oil film is because receiving shearing force and extrusion effect, shearing heating increases, lubricating oil viscosity changes, again because temperature distribution is inhomogeneous, make the bearing produce local deformation, local oil film attenuation, can take place tribology inefficacy phenomenon even in the part, lubricating oil leakage is serious, hydrostatic loss is very serious under this kind of condition, therefore, this patent proposes a novel oil pocket indent formula hydrostatic thrust bearing for hydrostatic thrust bearing during operation, wedge clearance can be produced between oil pocket and rotary worktable guide rail face, satisfy the condition that produces dynamic pressure effect, utilize dynamic pressure effect, compensate the loss of hydrostatic bearing capacity through dynamic pressure and reach the purpose that improves bearing capacity and stability. Disclosure of Invention The invention aims to solve the problem that the high-speed heavy-load static pressure thrust bearing has friction failure phenomenon caused by insufficient static pressure bearing capacity, so that the bearing precision and service life are affected, and provides a novel oil cavity concave static and dynamic pressure thrust bearing for solving the problem. The novel oil cavity concave type static and dynamic pressure thrust bearing is characterized in that the oil pad body is fan-shaped, the oil cavity is a runway type, the inside of the oil cavity is concave, and when the bearing works, a wedge-shaped gap is always generated at any position between a guide surface on the bottom surface of a rotary workbench and the oil cavity, so that the dynamic pressure generating condition is met. In the scheme I, the total thickness of the oil pad is 50mm, an oil sealing edge (9) on the oil pad is in a runway shape, a runway-shaped cavity with the thickness of 3mm and a runway-shaped bottom are arranged in the oil pad, an oil cavity (8) is formed by an arch with the height of 5mm in a concave manner, and an oil inlet hole (7) is formed. In scheme two, the total thickness of oil blanket is 50mm, and oil blanket upper seal oil limit (12) is the runway shape, and the oil blanket is inside to be a bottom to be runway shape oil seal limit, highly is 8mm indent arch oil pocket (11), and cylindrical inlet port (10) constitution oil pocket, and compare in scheme one, scheme two wedge clearance is bigger, and bearing area is bigger, and the dynamic pressure that can provide makes up also bigger. Compared with the existing hydrostatic thrust bearing, the hydrostatic thrust bearing cannot form a dynamic pressure effect, the hydrostatic thrust bearing is easy to cause hydrostatic loss due to serious leakage of lubricating oil and viscosity change of the lubricating oil, further the bearing work is influenced, the bearing precision and the service life are influenced, the wedge-shaped groove is formed in the oil cavity, dynamic pressure can be generated, the bearing area of an oil pad can be increased, the hydrostatic thrust bearing has the characteristics of the hydrostatic bearing and the dynamic pressure bearing, when the bearing works, the hydrostatic pressure is mainly generated at a low speed, and the dynamic pressure effect is generated at a high speed, so that the defect of the hydrostatic pressure is compensated by the dynamic pressure. The invention provides two wedge-shaped groove structures, such as a tenth explosion diagram of a novel oil cavity concave type static and dynamic pressure thrust bearing, as shown in FIG. 1, a side view of a scheme I, a section diagram of a scheme I, an oblique section diagram of a scheme I, a section diagram of a scheme II, a section diagram of a scheme 11, a pressure field of a conventional static and dynamic pressure thrust bearing oil film under a given working condition, fig. 12 is an oil film pressure field under the same working condition of the novel oil cavity concave static and dynamic pressure thrust bearing scheme provided by the invention, and comparing fig. 11 and 12, it can be seen that the pressure field maximum pressure of the novel oil cavity concave static and dynamic press