CN2899251Y - Super-high-speed motorized spindle with hybrid support of various types of bearings - Google Patents

Abstract

The utility model discloses an ultra-high-speed electric spindle mixedly supported by multiple types of bearings. It consists of a supporting system, a built-in motor, a housing, and a rotating shaft. The supporting system of the electric spindle is composed of two types of bearings: rolling bearings and magnetic suspension bearings. The characteristic of the ultra-high-speed motorized spindle with mixed support of various types of bearings is that the angular contact ball bearing with good high-speed performance and high rotation precision is used as the radial support bearing, and the two-way thrust electromagnetic bearing with large bearing capacity and no friction and wear is used as the shaft. The axial support bearing and the electric spindle structure are used to realize the functions of ultra-high speed, high precision and large axial bearing capacity. Advantages: ultra-high speed, high precision, large axial bearing capacity; reliable operation, long service life of bearings; compact structure, high efficiency and strong feasibility of the electric spindle.

Description

Super-high-speed motorized spindle with hybrid support of various types of bearings

technical field

The utility model relates to an ultra-high-speed electric spindle in the field of electromechanical engineering, in particular to an ultra-high-speed electric spindle with mixed support of multiple types of bearings.

Background technique

The high-speed electric spindle is a mechatronic power component that incorporates a drive motor to achieve high speed, high precision and high efficiency. At present, the support system of the electric spindle generally adopts the same type of bearings, so the structure of the electric spindle mainly includes: electric spindles supported by rolling bearings, electric spindles supported by fluid lubricated bearings, electric spindles supported by magnetic suspension bearings and electric spindles supported by other bearings. These electric spindles supported by the same type of bearings have a simple structure and can meet the requirements of simple high speed or simple heavy load. However, for applications that require both high speed and high rotation accuracy and large axial loads, It will lead to the following results for the electric spindle supported by the same type of bearing: (1) either it can only meet the requirements of high speed and high precision, or it can only meet the requirements of bearing large axial load, but it cannot take into account and achieve both aspects at the same time (2) If the requirements of the two aspects are barely taken into account, the service life of the bearing will be sacrificed (the bearing will fail in a short time), or the requirements for speed and precision will be reduced, and the structure of the electric spindle will be huge and complicated.

Therefore, it is necessary to develop a new type of high-speed electric spindle, which can not only bear a large axial load, achieve ultra-high speed and high precision, but also achieve high reliability, Long life operation.

Contents of the invention

The purpose of this utility model is to overcome the limitations of the current application of the electric spindle supported by the same type of bearings, and to provide an ultra-high-speed electric spindle supported by multiple types of bearings, which embodies ultra-high speed, high precision, large axial bearing capacity and long The advantages of long life, compact structure and strong feasibility.

In order to achieve the above object, the utility model adopts the following technical solutions:

An ultra-high-speed electric spindle with mixed support of various types of bearings, including a rotating shaft directly fixedly connected to a motor rotor, an electric spindle housing with a built-in motor stator, and a rotating shaft support system, characterized in that the rotating shaft support system uses a mixture of multiple types of bearings Supporting structure: Angular contact ball bearings are used as the radial support bearings of the rotating shaft, and two-way electromagnetic thrust bearings are used as the axial supporting bearings of the rotating shaft.

The above-mentioned installation arrangement of using angular contact ball bearings as the radial support bearings of the rotating shaft is: two sets of angular contact ball bearings in DB configuration are respectively installed at the front and rear ends of the rotating shaft.

In the electric spindle mentioned above, there are oil-air or oil-mist lubrication passages arranged in the front and rear end covers of the electric-spindle housing and connected to the inner cavity of the angular contact ball bearing to realize oil-air or oil mist lubrication for the bearing.

The installation arrangement of the above-mentioned two-way electromagnetic thrust bearing as the axial support bearing of the rotating shaft is: the stator of the two-way electromagnetic thrust bearing is installed on both sides of the thrust disk, the rotor of the electromagnetic bearing fixedly connected to the rotating shaft.

The above-mentioned electric spindle is provided with a liquid cooling function, and its cooling liquid channel is arranged in the shell of the electric spindle to realize the cooling of the built-in motor of the electric spindle, so as to maximize the output power of the built-in motor.

The structural features of the utility model are: (1) For the requirements of small radial force but high speed and high precision, angular contact ball bearings are used as radial support to limit the movement of the rotor system except in the axial direction and around the axial direction 4 degrees of freedom outside, and use oil-air or oil-mist lubrication to give full play to the advantages of good high-speed performance and high rotation accuracy of angular contact ball bearings and oil-air (or oil-mist) lubrication technology. In order to achieve ultra-high speed and high rotation accuracy, and to achieve a long service life of the bearing; (2) To meet the requirements of large axial external loads, a two-way electromagnetic thrust bearing with large bearing capacity, adjustable load, and non-contact characteristics is used as the The axial support of the electric spindle restricts the freedom of the rotor to move in the axial direction, bears all axial external loads, and can realize the long-life operation of the electric spindle.

Compared with the prior art, the utility model has the following substantive features and technical progress:

(1) The electric spindle has high speed and high rotation accuracy;

(2) The electric spindle has a large axial bearing capacity under ultra-high speed conditions;

(3) The electric spindle bearing is reliable in operation and has a long service life;

(4) Comprehensively exploit the advantages of rolling bearings and magnetic suspension bearings, and overcome the limitations of a single type of bearing;

(5) The electric spindle can meet the functional requirements of ultra-high speed, high precision, large axial bearing capacity and long-life operation on the basis of simple structure.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

Fig. 2 is a schematic diagram of the rotating shaft support system in the example of Fig. 1 .

Detailed ways

A preferred embodiment of the present utility model is: Referring to Fig. 1, the ultra-high-speed electric spindle supported by various types of bearings includes a rotating shaft 1 directly fixedly connected to a motor rotor 8, an electric spindle housing 6 with a built-in motor stator 7 and Shaft support system. The rotating shaft support system adopts a mixed support structure of various types of bearings, with angular contact ball bearings 5, 12 as the front and rear radial support bearings of the rotating shaft, and bidirectional electromagnetic thrust bearings 10, 11 as the axial supporting bearings of the rotating shaft.

The installation arrangement of the above-mentioned angular contact bearing as the radial support bearing of the rotating shaft is: two sets of DB-configured angular contact ball bearings 5 and 12 are respectively installed at the front and rear ends of the rotating shaft 1 . The inner rings of the two sets of angular contact ball bearings 5 at the front end are mounted on the front end of the rotating shaft 1, and are pressed and positioned by the front nut 2. The outer rings are embedded in the inner hole of the end cover 3 at the front end of the electric spindle housing 6. The ring can move axially in the end cover 3; the inner rings of the two sets of angular contact ball bearings 12 at the rear end are mounted on the rear end of the rotating shaft 1, and are pressed and positioned by the rear nut 15, and the outer rings are embedded in the electric spindle In the inner hole of the end cap 13 at the rear end of the housing 6, it can also move axially. The passages 4, 14 for oil gas or oil mist are set in the front and rear end covers 3 and 13 of the electric spindle housing 6 and connected to the inner cavities of the angular contact ball bearings 5, 12 to realize oil gas or oil mist lubrication for the bearings.

The installation of the above-mentioned electromagnetic bearing as the axial support bearing of the rotating shaft is: the stator 11 of the two-way electromagnetic thrust bearing is installed on both sides of the thrust disk 10, the rotor of the electromagnetic bearing fixedly connected to the rotating shaft 1 .

In the electric spindle mentioned above, a liquid cooling function is provided, and the cooling liquid channel 9 is arranged in the electric spindle housing 6 to realize cooling of the motor stator 7 built in the electric spindle.

See Figure 2 for the principle of the supporting system of the rotating shaft. The four degrees of freedom of the rotating shaft 1 moving along the x and y axes and rotating around the x and y axes are constrained by the radial support bearings 5 and 12 at the front and rear ends of the electric spindle. The degree of freedom of movement along the rotor axis z direction is limited by bi-directional magnetic suspension thrust bearings 10,11. The rolling bearings supported radially at the front and rear ends are angular contact ball bearings (also known as spindle bearings) with good high-speed performance and high rotation precision, and are lubricated with oil mist or oil-air to improve the speed parameter d _m n of the bearing (bearing pitch diameter The product of d _m and rotational speed n) value and service life; the axial magnetic suspension bearings 10 and 11 are non-contact bidirectional thrust electromagnetic bearings with strong bearing capacity, no friction and wear. During the working process, the radial bearings at the front and rear end can move axially in the inner holes of the front and rear end covers without bearing external axial working loads, so they can achieve very long rotation at ultra-high speed and high precision. Longevity: The two-way thrust electromagnetic bearings 10 and 11 bear all the external axial working load F _a . Due to the non-contact feature, the electromagnetic bearings have no friction and wear under heavy loads, high efficiency and long life.

Claims (5)

1, the high-speed motorized spindles of one kind of multiple types of bearings mixing bearings, comprise the rotating shaft (1) of direct fixedly connected rotor (8), the electric main shaft housing (6) and the shaft support system of inner electric machine stator (7), it is characterized in that described shaft support system adopts polytype bearing mixing bearing structure, with angular contact ball bearing (5,12) as the rotating shaft radial support bearing, and with the axially mounting bearing of bi-directional electromagnetic thrust bearing (10,11) as rotating shaft.

2, the high-speed motorized spindles of polytype bearing mixing bearing according to claim 1, it is characterized in that describedly with angular contact ball bearing as the installation setting of rotating shaft radial support bearing being: in the front and back ends portion of rotating shaft (1) angular contact ball bearing (5,12) that two cover DB configurations are set is installed respectively, bearing can move axially in forward and backward end cap (3,13) endoporus.

3, the high-speed motorized spindles of polytype bearing mixing bearing according to claim 2, it is characterized in that having oil gas or mist of oil function, its oil gas or fog lubrication passage (4,14) are arranged in the forward and backward end cap (3,13) of electric main shaft housing (6) and are switched to angular contact ball bearing (5,12) inner chamber, realize this bearing is carried out oil gas or fog lubrication.

4, the high-speed motorized spindles of polytype bearing mixing bearing according to claim 1 and 2 is characterized in that describedly with the bi-directional electromagnetic thrust bearing as the installation setting of rotating shaft axially mounting bearing being: at the rotor of the fixedly connected electromagnetic bearing of rotating shaft (1)---the stator (11) that the bi-directional electromagnetic thrust bearing is set is installed in the both sides of thrust collar (10).

5, the high-speed motorized spindles of polytype bearing mixing bearing according to claim 1 is characterized in that having the liquid cools function, and its cooling duct (9) are arranged in the electric main shaft housing (6), realizes the cooling to electric main shaft.