CN218799158U

CN218799158U - Dynamic and static pressure main shaft

Info

Publication number: CN218799158U
Application number: CN202223454390.9U
Authority: CN
Inventors: 洪华文; 和国娟; 廖明方
Original assignee: Yunnan Cosis Machine Tool Co ltd
Current assignee: Yunnan Cosis Machine Tool Co ltd
Priority date: 2022-12-23
Filing date: 2022-12-23
Publication date: 2023-04-07
Anticipated expiration: 2032-12-23

Abstract

The utility model discloses a hybrid main shaft, including sleeve, main shaft, thrust ball bearing and hydrostatic bearing structure, the main shaft passes through the thrust ball bearing setting at both ends inside the sleeve, and is provided with the hydrostatic bearing structure on the axle bush section of main shaft, the hydrostatic bearing structure includes oil inlet, oil-out, oil feed oil circuit and oil circuit, oil inlet and oil-out set up outside the sleeve, and the oil inlet is linked together through oil feed oil circuit and forms a cavity structure; one end of the bearing bush is provided with a sealing ring, an O-shaped ring and a front end cover; the upper portion of the sleeve is provided with an axial-flow pump, and the axial-flow pump is connected with the oil inlet through a pipeline. The utility model discloses can realize that the main shaft is in lubricated state all the time when rotating, and improve the bearing capacity of bearing.

Description

Dynamic and static pressure main shaft

Technical Field

The utility model belongs to the technical field of general mechanical equipment, concretely relates to hybrid main shaft.

Background

Because the gap between the outer ring and the roller is small in the traditional mechanical bearing, when the rotating speed of the main shaft is increased to a certain degree, the temperature rise of the bearing is high, and the further increase of the rotating speed of the main shaft is hindered. Therefore, in order to meet the requirement of high speed of the main shaft, the bearing structure adopts a hydrodynamic and hydrostatic non-contact bearing as a bearing of the high speed main shaft, thereby not only overcoming the defect that a hydrodynamic bearing can not ensure the lubricating state of pure liquid friction during low speed, starting and stopping, but also overcoming the defect of low bearing capacity of a hydrostatic bearing.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a hybrid main shaft can realize that the main shaft is in lubricated state all the time when rotating, and improves the bearing capacity of bearing.

In order to solve the technical problem, the utility model adopts the following technical scheme:

a dynamic and static pressure main shaft comprises a sleeve, a main shaft, thrust ball bearings and a static pressure bearing structure, wherein the main shaft is arranged inside the sleeve through the thrust ball bearings at two ends, the static pressure bearing structure is arranged on a bearing bush section of the main shaft, the static pressure bearing structure comprises an oil inlet, an oil outlet, an oil inlet oil way and an oil outlet oil way, the oil inlet and the oil outlet are arranged outside the sleeve, and the oil inlet is communicated with the oil outlet oil way through the oil inlet oil way to form a cavity structure; one end of the bearing bush is provided with a sealing ring, an O-shaped ring and a front end cover; the upper portion of the sleeve is provided with an axial-flow pump, and the axial-flow pump is connected with the oil inlet through a pipeline.

Furthermore, the front end cover and the rear end cover are connected with the sleeve through limit screws, and a sealing ring and an O-shaped ring are arranged between the rear end cover and the bearing bush.

Furthermore, a first nut and a second nut are respectively arranged at the left end and the right end of the main shaft.

Further, a filter is arranged at the joint of the oil outlet and the oil inlet path.

Furthermore, the filter is a rectangular cavity structure with two open ends, and a filter screen is arranged inside the filter.

Compared with the prior art, the utility model discloses one of following beneficial effect has at least:

the main shaft is arranged in the sleeve and is connected with the main shaft through thrust ball bearings on two sides to realize dynamic pressure combination, a static pressure bearing structure is arranged in the sleeve, a cavity on the sleeve and the main shaft is adopted, lubricating oil is guided into the cavity on the sleeve and the main shaft through an axial flow pump to form a bearing oil film, a shaft neck and a bearing are in a complete liquid friction state to form the static pressure bearing, an oil wedge is formed between the shaft neck and the bearing bush of the main shaft due to the existence of a special oil cavity on the bearing bush, the internal pressure of liquid can be further improved along with the improvement of the rotating speed of the main shaft, a dynamic pressure bearing oil film is formed, and the bearing capacity of the bearing can be greatly improved after dynamic pressure and static pressure are superposed.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is the schematic structural diagram of the bearing bush part of the present invention.

In the figure: the device comprises a sleeve 1, a main shaft 2, a rear end cover 3, a thrust ball bearing 5, a front end cover 7, a sealing ring 8, an oil outlet 9, an oil inlet 10, an oil inlet 11, an oil inlet oil way 12, an oil outlet oil way 13, a second screw cap 14, a first screw cap 14, an O-shaped ring 15, a bearing bush 16 and an axial-flow pump 17.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following description is taken in conjunction with the accompanying drawings

And an embodiment of the present invention will be described in further detail. It should be understood that the particulars described herein are of particular interest

The examples are provided only for explaining the present invention and are not intended to limit the present invention.

In the description of the present invention, it is to be understood that "front, rear, upper, lower, left, right", "inner,

The directions or positional relationships indicated by the outer, bottom, top, etc. are generally based on the directions or positions shown in the drawings

Relationships are for convenience of description and simplicity of description only, and in the event that no reverse explanation is made, these are intended to be included

The directional terms do not indicate or imply that the referenced device or element must have a particular orientation or be in a particular direction

Bit configuration and operation, and therefore, should not be construed as limiting the scope of the invention.

Example 1

Referring to fig. 1 and 2, a hybrid spindle is shown, and includes a sleeve 1, a spindle 2, thrust ball bearings 5 and a hydrostatic bearing structure, where the spindle 2 is disposed inside the sleeve 1 through the thrust ball bearings 5 at two ends, and a section of a bearing bush 16 of the spindle 2 is provided with the hydrostatic bearing structure, the hydrostatic bearing structure includes an oil inlet 10, an oil outlet 9, an oil inlet path 11 and an oil outlet path 12, the oil inlet 10 and the oil outlet 9 are disposed outside the sleeve 1, and the oil inlet 10 is communicated with the oil outlet path 12 through the oil inlet path 11 to form a cavity structure; one end of the bearing bush 16 is provided with a sealing ring 8, an O-shaped ring 15 and a front end cover 7; an axial flow pump 17 is arranged at the upper part of the sleeve 1, and the axial flow pump 17 is connected with the oil inlet 10 through a pipeline; in the scheme, the whole main shaft is arranged in the sleeve through the thrust ball bearings 5 on two sides, lubricating oil is introduced into the main shaft through the static pressure bearing structure, an oil film structure is formed between the main shaft and the sleeve, and the shaft neck and the bearing are in a complete liquid friction state to form the static pressure bearing. Because the special oil cavity is arranged on the bearing bush, the oil wedge is formed between the main shaft journal and the bearing bush, the internal pressure of liquid is further increased along with the increase of the rotating speed of the main shaft, a dynamic pressure bearing oil film is formed, and the bearing capacity of the bearing can be greatly improved after dynamic pressure and static pressure are superposed. Therefore, the dynamic and static pressure bearing overcomes the defects that the dynamic pressure bearing can not ensure the pure liquid friction lubrication state during low speed, starting and stopping, and the static pressure bearing has low bearing capacity, and is a novel bearing which absorbs the respective advantages of the dynamic pressure bearing and the static pressure bearing and overcomes the respective disadvantages of the dynamic pressure bearing and the static pressure bearing.

Example 2:

in this embodiment, a front end cover 7 is further described on the basis of the existing embodiment 1, the front end cover 7 and a rear end cover 3 are connected to a sleeve 1 through a limit screw, and a seal ring 8 and an O-ring 15 are arranged between the rear end cover 3 and a bearing bush 16; a first nut 14 and a second nut 13 are respectively arranged at the left end and the right end of the main shaft 2; a filter is arranged at the joint of the oil outlet 9 and the oil inlet path 11; the filter is of a rectangular cavity structure with openings at two ends, and a filter screen is arranged inside the filter; the whole structure is provided with the filter between the oil outlet 9 and the oil inlet path, so that the cleanness of lubricating oil is effectively guaranteed.

The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. In a further aspect of the present invention,

when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of other ones of the embodiments

It is also within the scope of the present invention for the embodiments to achieve such features, structures, or characteristics.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims

1. The utility model provides a hybrid main shaft, includes sleeve (1), main shaft (2), thrust ball bearing (5) and hydrostatic bearing structure, its characterized in that: the spindle (2) is arranged inside the sleeve (1) through thrust ball bearings (5) at two ends, a static pressure bearing structure is arranged on a bearing bush (16) section of the spindle (2), the static pressure bearing structure comprises an oil inlet (10), an oil outlet (9), an oil inlet oil way (11) and an oil outlet oil way (12), the oil inlet (10) and the oil outlet (9) are arranged outside the sleeve (1), and the oil inlet (10) is communicated with the oil outlet oil way (12) through the oil inlet oil way (11) to form a cavity structure; one end of the bearing bush (16) is provided with a sealing ring (8), an O-shaped ring (15) and a front end cover (7); an axial flow pump (17) is arranged on the upper portion of the sleeve (1), and the axial flow pump (17) is connected with the oil inlet (10) through a pipeline.

2. The hybrid spindle according to claim 1, wherein: the front end cover (7) and the rear end cover (3) are connected with the sleeve (1) through limiting screws, and a sealing ring (8) and an O-shaped ring (15) are arranged between the rear end cover (3) and the bearing bush (16).

3. The hybrid spindle according to claim 1, wherein: the left end and the right end of the main shaft (2) are respectively provided with a first nut (14) and a second nut (13).

4. The hybrid spindle according to claim 1, wherein: and a filter is arranged at the joint of the oil outlet (9) and the oil inlet passage (11).

5. The hybrid spindle according to claim 4, wherein: the filter is a rectangular cavity structure with two open ends, and a filter screen is arranged inside the filter.