CN218940920U

CN218940920U - High-thrust linear motor with angular contact bearing ball screw structure

Info

Publication number: CN218940920U
Application number: CN202223103660.1U
Authority: CN
Inventors: 蔡杰; 龚燕青
Original assignee: Nanotec Electronic Changzhou Co ltd
Current assignee: Nanotec Electronic Changzhou Co ltd
Priority date: 2022-11-22
Filing date: 2022-11-22
Publication date: 2023-04-28
Anticipated expiration: 2032-11-22

Abstract

The utility model belongs to the technical field of motor equipment, and relates to a high-thrust linear motor with an angular contact bearing ball screw structure, which comprises a motor stator assembly, wherein a motor rotor assembly is sleeved in the motor stator assembly, the motor rotor assembly is provided with a hollow shaft, the front end of the motor stator assembly is provided with a front end cover, the rear end of the motor stator assembly is provided with a rear end cover, one end of the hollow shaft is provided with a deep groove ball bearing, the deep groove ball bearing is arranged in the rear end cover, the other end of the hollow shaft is sequentially provided with an angular contact double-row ball bearing and a ball screw nut, the hollow shaft is internally provided with a ball screw, the ball screw is matched with the ball screw nut, and the angular contact double-row ball bearing is arranged in the front end cover; the angular contact double-row ball bearing can bear larger radial and axial loads; the problem of current adoption T type lead screw precision, transmission efficiency low is solved, satisfies and utilizes ball on small-size linear electric motor compact structure, convenient to use's problem, still has advantages such as load is big, maintenance cost is low.

Description

High-thrust linear motor with angular contact bearing ball screw structure

Technical Field

The utility model belongs to the technical field of motor equipment, and particularly relates to a high-thrust linear motor with an angular contact bearing ball screw structure.

Background

In general, a small-sized linear motor generally adopts a small-sized T-shaped screw, and the T-shaped screw can meet the structure of the small-sized linear motor, but has low precision and transmission efficiency; for example, a Chinese patent with the publication number of CN 208644793U discloses a trapezoidal screw pair of a machine tool, which is convenient for controlling a stepping motor to rotate positively and negatively through a stepping motor switch arranged, so as to drive a trapezoidal screw to rotate, and under the action of a guide rod, a trapezoidal screw nut is driven to move transversely, and the screw structure is complex and is not suitable for a small-sized linear motor; compared with a T-shaped screw, the ball screw has the advantages of low friction coefficient, long service life, large load, high precision, high efficiency and the like, but due to larger size, the ball screw is generally not suitable for a small linear motor with compact structure, and the ball screw is often limited in occasions with limited space in the linear motor and is inconvenient to use, so that the requirements of compact structure, small volume, convenient use and the like are met when the ball screw is used on the small linear motor, and the precision and the transmission efficiency of the linear motor are improved; in addition, because the ball screw has large load, the problem that the connecting position is not damaged under large load needs to be overcome when the ball screw is utilized to a small linear motor; for example, in the chinese patent with publication number CN 115118114A, a linear screw hybrid stepper motor is provided, in which a ball nut is screwed with a threaded portion of a central shaft, and the connection portion between a motor main body and the ball nut is easily damaged due to a large load, thereby affecting transmission efficiency.

Disclosure of Invention

The utility model aims to solve the defects in the prior art and provides a high-thrust linear motor with an angular contact bearing ball screw structure.

In order to achieve the above purpose, the utility model is realized by the following technical scheme: the utility model provides a take angular contact ball screw structure's high thrust linear electric motor, includes motor stator subassembly, motor stator subassembly endotheca motor rotor subassembly, and motor rotor subassembly has the hollow shaft, motor stator subassembly's front end is equipped with the front end housing, and motor stator subassembly's rear end is equipped with the rear end cap, the one end of hollow shaft is equipped with deep groove ball bearing, and deep groove ball bearing sets up in the rear end cap, the other end of hollow shaft is equipped with angular contact double row ball bearing, ball screw nut in proper order, is equipped with ball screw in the hollow shaft, ball screw and ball screw nut cooperation, angular contact double row ball bearing sets up in the front end cap, front end cap one side is equipped with the brake, and the brake is used for pinning under the circumstances of outage.

Preferably, the hollow shaft is provided with external threads, and the internal threads of the ball screw nut are screwed with the external threads of the hollow shaft in a matched manner.

Preferably, the side of the ball screw nut is provided with a set screw, and the set screw penetrates through the side of the ball screw nut and is locked on the hollow shaft.

The internal thread of the ball screw nut is matched and locked with the external thread of the hollow shaft, the ball screw nut and the hollow shaft are penetrated by a set screw to be tightened again, and the screw loosening is prevented, so that the ball screw nut is driven to synchronously rotate in the rotation process of the hollow shaft, and the ball screw is driven to do reciprocating linear motion in the hollow shaft. In order to prevent the bearing from being damaged under a heavy load, the angular contact double-row ball bearing is used for limiting radial runout on one hand, and on the other hand, the angular contact double-row ball bearing is more rigid than a common deep groove ball bearing and can bear larger radial and axial loads.

Preferably, one side of the front end cover is sequentially provided with a connecting plate and a brake, the brake is connected with the connecting plate through a first cylindrical head screw, and one end of the hollow shaft provided with the angular contact double-row ball bearing sequentially penetrates through the connecting plate and the brake.

Preferably, the 4 corners of the brake are respectively provided with a first threaded hole A, the positions of the connecting plate corresponding to the first threaded holes A are provided with second threaded holes B, and the first cylindrical head screws sequentially penetrate through the first threaded holes A and the second threaded holes B to connect the brake with the connecting plate.

Preferably, a heat dissipation shell is arranged outside the brake, the heat dissipation shell is sequentially connected with the connecting plate and the front end cover through second cylindrical head screws, and the surface of the heat dissipation shell is in a strip shape.

In order to realize the locking function, the motor is integrated with the brake, the position of the shaft can be locked under the condition of power failure, accidents are prevented, the outer shell of the brake is made into a strip shape with better heat dissipation function, the brake is prevented from being damaged due to overheating, the brake is arranged in the heat dissipation shell, and the heat dissipation shell, the connecting plate and the front end cover are tightly connected, so that the structure is compact, and meanwhile, the locking function is increased.

Preferably, one side of the rear end cover is sequentially provided with a bottom plate and an encoder, and the encoder is used for feeding back the position of the motor.

Preferably, the bottom plate is connected with the rear end cover through countersunk head screws, the bottom plate is provided with first countersunk head screw holes, second countersunk head screw holes are formed in positions, corresponding to the first countersunk head screw holes, of the rear end cover, and the countersunk head screws sequentially penetrate through the first countersunk head screw holes and the second countersunk head screw holes.

And an encoder is arranged on the rear end cover of the motor and used for feeding back the position of the motor, so that the screw rod can run more accurately.

Preferably, a mounting groove is formed in one side of the connecting plate, and the brake is mounted in the mounting groove. One side of the brake is arranged in the mounting groove, so that the length of the motor is shortened, the whole structure is compact, and the installation and the use are convenient in a scene with limited space.

The utility model has the following beneficial effects:

(1) According to the utility model, the hollow shaft motor is used, the ball screw assembly is matched, the internal thread of the ball screw nut is matched and locked with the external thread of the hollow shaft, and the ball screw nut is driven to synchronously rotate in the process of rotating the hollow shaft, so that the ball screw can do reciprocating linear motion in the hollow shaft, and meanwhile, the angular contact double-row ball bearing is used, so that larger radial and axial loads can be borne.

(2) According to the utility model, the front end of the motor is provided with the brake, the heat dissipation shell is arranged outside the brake, so that the brake is prevented from being damaged due to overheat, the heat dissipation shell, the connecting plate and the front end cover are tightly connected, the locking function is realized while the structure is compact, and the position of the shaft is locked under the condition of power failure, so that accidents are prevented.

(3) The utility model installs the encoder at the rear end cap of the motor, is used for the motor position feedback, make the lead screw run more accurately, because the compact structure, the load is bigger, the maintenance cost is low, etc., can be widely used in automatic, semi-automatic fields such as the robot, medical industry, etc.

Drawings

FIG. 1 is a schematic diagram of an explosive structure of the present utility model;

FIG. 2 is a cross-sectional view of the present utility model;

FIG. 3 is a partially enlarged schematic illustration of FIG. 2;

FIG. 4 is a schematic diagram of the structure of the present utility model;

fig. 5 is a schematic structural diagram of a connection board in embodiment 2 of the present utility model.

In the figure: 1. a heat dissipation housing; 2. a first cylindrical head screw; 3. braking; 4. a connecting plate; 5. a ball screw; 6. a ball screw nut; 7. a set screw; 8. angular contact double-row ball bearings; 9. a front end cover; 10 a second cylindrical head screw; 11. a motor stator assembly; 12. a motor rotor assembly; 13. deep groove ball bearings; 14 a rear end cap; 15 a bottom plate; 16 countersunk head screws; 17 encoder, 18 mounting slot.

Description of the embodiments

Embodiments of the utility model are disclosed in the drawings, and for purposes of explanation, numerous practical details are set forth in the following description. However, it should be understood that these practical details are not to be taken as limiting the utility model. That is, in some embodiments of the utility model, these practical details are unnecessary. Moreover, for the purpose of simplifying the drawings, some conventional structures and components are shown in the drawings in a simplified schematic manner.

Example 1

The utility model provides a take angular contact ball screw structure's high thrust linear electric motor, including motor stator module 11, motor stator module 11 endotheca motor rotor module 12, motor rotor module 12 has the hollow shaft, motor stator module 11's front end is equipped with front end housing 9, motor stator module 11's rear end is equipped with rear end housing 14, the one end of hollow shaft is equipped with deep groove ball bearing 13, deep groove ball bearing 13 sets up in rear end housing 14, the other end of hollow shaft is equipped with angular contact biserial ball bearing 8 in proper order, ball screw nut 6, the hollow shaft is equipped with the external screw thread, ball screw nut 6's internal screw and hollow shaft's external screw thread cooperation are screwed, ball screw nut 6's side is equipped with holding screw 7, holding screw 7 passes ball screw nut 6's side and locks on the hollow shaft, prevent that the screw thread from becoming flexible.

The hollow shaft is internally provided with a ball screw 5, the ball screw 5 is matched with a ball screw nut 6, and an angular contact double-row ball bearing 8 is arranged in a front end cover 9.

One side of the front end cover 9 is sequentially provided with a connecting plate 4 and a brake 3, 4 corners of the brake 3 are provided with first threaded holes A, the positions of the connecting plate 4 corresponding to the first threaded holes A are provided with second threaded holes B, and a first cylindrical head screw 2 sequentially penetrates through the first threaded holes A and the second threaded holes B to connect the brake 3 with the connecting plate 4; the end of the hollow shaft provided with the angular contact double-row ball bearing 8 sequentially passes through the connecting plate 4 and the brake 3.

The brake 3 is externally provided with a heat dissipation shell 1, the heat dissipation shell 1 is sequentially connected with the connecting plate 4 and the front end cover 9 through a second cylindrical head screw 10, and the surface of the heat dissipation shell 1 is in a strip shape.

One side of the rear end cover 14 is provided with a bottom plate 15 and an encoder 17 in sequence, and the encoder 17 is used for feeding back the position of the motor.

The bottom plate 15 is connected with the rear end cover 14 through countersunk head screws 16, the bottom plate 15 is provided with first countersunk head screw holes, second countersunk head screw holes are formed in positions, corresponding to the first countersunk head screw holes, of the rear end cover 14, and the countersunk head screws 16 sequentially penetrate through the first countersunk head screw holes and the second countersunk head screw holes.

The use principle is as follows: firstly, preassembling a rear end cover 14, a deep groove ball bearing 13, a motor rotor assembly 12, a motor stator assembly 11 and a front end cover 9 into a motor main body; the motor stator assembly 11 wraps the motor rotor assembly 12, one end of the motor rotor assembly is provided with a deep groove ball bearing 13, the deep groove ball bearing 13 is arranged in a bearing chamber of the rear end cover 14, and the rear end cover 14 is arranged at the rear end of the motor stator assembly 11;

the angular contact double-row ball bearing 8 is placed in a bearing chamber of the front end cover 9, the internal thread of the ball screw nut 6 is tightly matched with the external thread on the hollow shaft of the motor rotor assembly 12, and the ball screw nut 6 is locked on the hollow shaft of the motor rotor assembly by a set screw 7 penetrating through the side edge of the ball screw nut 6;

installing the ball screw 5 in the hollow shaft, and screwing the ball screw 5 into the ball screw nut 6; mounting the front end cover 9 with the motor stator assembly 11;

the front end cover 9 is sleeved at the seam allowance of the connecting plate 4, the brake 3 is fixed on the connecting plate 4 by 4 first cylindrical head screws, the heat dissipation shell 1 is covered, and 4 second cylindrical head screws 10 penetrate through the front end cover 9 and the connecting plate 4 and are fixed on the heat dissipation shell 1;

the encoder 17 is finally mounted on the base plate 15 by means of 2 countersunk screws 16 which are fastened to the rear end cap 14 through the base plate 15.

Example 2

One side of the front end cover 9 is sequentially provided with a connecting plate 4 and a brake 3, one side of the connecting plate 4 is provided with a mounting groove 18, the brake 3 is mounted in the mounting groove 18, and the brake 3 is connected with the connecting plate 4 through a first cylindrical head screw 2; the end of the hollow shaft provided with the angular contact double-row ball bearing 8 sequentially passes through the connecting plate 4 and the brake 3.

The foregoing has outlined and described the basic principles, features, and advantages of the present utility model. However, the foregoing is merely specific examples of the present utility model, and the technical features of the present utility model are not limited thereto, and any other embodiments that are derived by those skilled in the art without departing from the technical solution of the present utility model are included in the scope of the present utility model.

Claims

1. The utility model provides a take angular contact ball screw structure's high thrust linear electric motor, includes motor stator subassembly (11), motor stator subassembly (11) endotheca motor rotor subassembly (12), and motor rotor subassembly (12) have the hollow shaft, the front end of motor stator subassembly (11) is equipped with front end housing (9), and the rear end of motor stator subassembly (11) is equipped with rear end housing (14), its characterized in that, the one end of hollow shaft is equipped with deep groove ball bearing (13), and deep groove ball bearing (13) set up in rear end housing (14), the other end of hollow shaft is equipped with angular contact double row ball bearing (8), ball screw nut (6) in proper order, is equipped with ball screw (5) in the hollow shaft, ball screw (5) and ball screw nut (6) cooperation, angular contact double row ball bearing (8) set up in front end housing (9), front end housing (9) one side is equipped with brake (3), and brake (3) are used for pinning the hollow shaft under the outage condition.

2. The high thrust linear motor with angular contact bearing ball screw structure according to claim 1, characterized in that the hollow shaft is provided with external threads, and the internal threads of the ball screw nut (6) are screwed in cooperation with the external threads of the hollow shaft.

3. The high thrust linear motor with angular contact bearing ball screw structure according to claim 1, characterized in that the side edge of the ball screw nut (6) is provided with a set screw (7), and the set screw (7) passes through the side edge of the ball screw nut (6) and is locked on the hollow shaft.

4. The high-thrust linear motor with the angular contact bearing ball screw structure according to claim 1, wherein one side of the front end cover (9) is sequentially provided with a connecting plate (4) and a brake (3), the brake (3) is connected with the connecting plate (4) through a first cylindrical head screw (2), and one end of the hollow shaft provided with the angular contact double-row ball bearing (8) sequentially penetrates through the connecting plate (4) and the brake (3).

5. The high thrust linear motor with the angular contact bearing ball screw structure according to claim 4, wherein the 4 corners of the brake (3) are provided with first threaded holes a, the positions of the connecting plate (4) corresponding to the first threaded holes a are provided with second threaded holes B, and the first cylindrical head screws (2) sequentially penetrate through the first threaded holes a and the second threaded holes B to connect the brake (3) with the connecting plate (4).

6. The high-thrust linear motor with the angular contact bearing ball screw structure according to claim 4, wherein a heat dissipation shell (1) is arranged outside the brake (3), the heat dissipation shell (1) is sequentially connected with the connecting plate (4) and the front end cover (9) through a second cylindrical head screw (10), and the surface of the heat dissipation shell (1) is in a strip shape.

7. The high-thrust linear motor with the angular contact bearing ball screw structure according to claim 1, wherein one side of the rear end cover (14) is sequentially provided with a bottom plate (15) and an encoder (17), and the encoder (17) is used for motor position feedback.

8. The high-thrust linear motor with the angular contact bearing ball screw structure according to claim 7, wherein the bottom plate (15) is connected with the rear end cover (14) through a countersunk head screw (16), the bottom plate (15) is provided with a first countersunk head screw hole, a second countersunk head screw hole is arranged at a position of the rear end cover (14) corresponding to the first countersunk head screw hole, and the countersunk head screw (16) sequentially penetrates through the first countersunk head screw hole and the second countersunk head screw hole.

9. The high thrust linear motor with the angular contact bearing ball screw structure according to claim 4, wherein one side of the connecting plate (4) is provided with a mounting groove (18), and the brake (3) is mounted in the mounting groove (18).