Hollow motor

Abstract

The utility model discloses a hollow motor, which belongs to the field of machine tool corollary equipment and comprises a transmission structure, a motor shell and a brake, the transmission structure comprises a nut, an outer ring structure and a front connecting piece, the outer ring structure of the front connecting piece is connected with the nut, and an inner ring structure of the front connecting piece is connected with the front end of a motor rotor; the rear end of the motor rotor is connected with an inner ring of a rear connecting piece, and an outer ring of the rear connecting piece is connected with a brake. According to the utility model, through the design of the front and rear connecting pieces, the connection strength of the connection part of the hollow motor rotor structure with the transmission structure and the brake structure is enhanced, the risk of fracture of the connection part of the motor rotor caused by frequent feeding is reduced, and the rotor structure of the hollow motor is protected; and transmission structures and brake structures with different sizes are matched, so that the hollow motor is more flexible to assemble.

Description

Technical Field

[0001] The utility model relates to the field of machine tool supporting equipment, in particular to a hollow motor used for a parallel machine tool. Background Art

[0002] Currently, most parallel machine tools use hollow motors as the power assembly. The position of the spindle on the hollow motor is adjusted by controlling the transmission feed of the hollow motor installed on the Hook screw. At the same time, multiple hollow motors are used in linkage, so as to achieve the purpose of accurately controlling the spatial position of the spindle of the parallel machine tool.

[0003] The hollow motor has an axially connected assembly structure. Since it needs to be frequently fed along the screw, the front and rear ends of the motor rotor are prone to breakage, damaging the motor rotor. In severe cases, the hollow motor may be scrapped. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes a hollow motor. The utility model arranges connecting structures at the front and rear ends of the hollow motor rotor. On the one hand, the connecting structure enhances the structural strength of the connection between the front and rear ends of the motor rotor, and reduces the damage to the motor rotor caused by frequent feeding transmission; on the other hand, the front and rear connecting structures can be disassembled and replaced to match nuts or brakes of different external sizes, and the assembly is more flexible and universal.

[0005] The utility model provides a hollow motor, comprising:

[0006] The transmission structure includes a nut, and the nut is loosely matched with a lead screw passing through the hollow motor; the transmission structure also includes a front connecting piece, the outer ring of the front connecting piece is integrally connected with the nut, and the inner ring of the front connecting piece is fastened to the motor rotor, and the rotation of the motor rotor drives the nut to rotate and feed along the lead screw in a straight line;

[0007] A motor structure, wherein the motor structure comprises a motor housing, wherein the motor housing is a hollow housing, a motor stator is fixedly mounted on the inner wall of the motor housing, a motor rotor is correspondingly arranged in the radial inner part of the motor stator, and a rear connecting piece is connected to one end of the motor rotor away from the front connecting piece;

[0008] The brake comprises a brake electromagnet, a brake armature and an armature fixing member, wherein the brake armature is connected to the outer ring of the rear connecting member through the armature fixing member, and the brake electromagnet is energized to control the attraction with the brake armature.

[0009] Preferably, a nut housing is installed on the radial outer periphery of the nut, a limiting structure is provided between the nut and the nut housing, the limiting structure limits the relative position of the nut along the axial movement of the screw rod, and the limiting structure is a step structure.

[0010] Preferably, a front end cover is fixedly connected to the front end surface of the nut housing, and an oil seal structure is used to seal the front end cover and the nut.

[0011] Preferably, at least two groups of angular contact ball bearings are arranged between one end of the motor rotor close to the front connecting piece and the motor housing, and each group of angular contact ball bearings is supported and positioned axially by an inner spacer and an outer spacer.

[0012] Preferably, a deep groove ball bearing is radially mounted on one end of the motor rotor close to the rear connecting piece and the motor housing, and an elastic retaining ring is used to clamp the motor rotor and the deep groove ball bearing.

[0013] Preferably, a brake housing is provided on the outside of the brake, and the brake housing is a hollow shell structure. The brake and the rear connecting piece are both arranged in the inner cavity of the brake housing.

[0014] Preferably, the brake electromagnet is connected to the motor back cover, the brake armature screw is fastened to the armature fixing piece, a gap is provided between the brake electromagnet and the brake armature along the screw direction, the motor back cover is a hollow disc structure, and a seal is provided between the hollow position of the motor back cover and the brake.

[0015] Preferably, a circular grating housing is axially installed between the brake housing and the motor housing, and a circular grating code disk and a reading head are arranged in the circular grating housing.

[0016] Preferably, the circular grating code disk is assembled between the rear connecting piece and the electronic rotor and is axially connected to the circular grating fixing piece. The circular grating fixing piece is radially locked on the motor rotor, and the connecting hole on the inner ring of the rear connecting piece is axially fastened to the rear end of the motor rotor; the reading head is fixedly connected to the inner wall of the circular grating housing to detect the rotational angular displacement of the circular grating code disk.

[0017] Preferably, the front connecting member and the rear connecting member are both hollow cylindrical boss structures, and the end surfaces of the inner ring and the outer ring of the hollow cylindrical boss structure are uniformly distributed with connecting holes in the circumferential direction.

[0018] The beneficial effects of the utility model are as follows:

[0019] 1. The utility model utilizes front and rear connecting pieces to enhance the connection strength between the hollow motor rotor structure and the transmission structure and the brake, reduces the risk of motor rotor connection breakage caused by frequent feeding, and protects the rotor structure of the hollow motor.

[0020] 2. The utility model can make the assembly of the hollow motor more flexible by replacing the front and rear connecting pieces, adjusting the size of the outer ring, and matching transmission structures and brakes of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an axial cross-sectional view of a hollow motor of the utility model;

[0022] Figure 2 This is a radial cross-sectional view of a circular grating of a hollow motor of the utility model;

[0023] Figure 3 This is a partial enlarged view of the rear end connection of a hollow motor of the utility model;

[0024] Figure 4 This is a three-dimensional diagram of the front end connection transmission structure of a hollow motor of the utility model;

[0025] Figure 5 This is a three-dimensional diagram of a rear end connection brake of a hollow motor of the utility model;

[0026] Figure 6 It is a structural stereogram of a motor housing and a bearing part of a hollow motor of the utility model;

[0027] Figure 7 This is a three-dimensional diagram of a front connecting piece of a hollow motor of the utility model;

[0028] Figure 8 It is a three-dimensional diagram of a rear connecting piece of a hollow motor of the utility model.

[0029] In the figure: 1, front cover, 2, skeleton oil seal, 3, nut, 4, front connecting piece, 5, locking nut, 6, motor stator, 7, motor housing, 8, circular grating fixing piece, 9, rear connecting piece, 10, armature fixing piece, 11, brake electromagnet, 12, motor rear cover, 13, seal, 14, brake armature, 15, brake housing, 16, circular grating housing, 17, elastic retaining ring, 18, motor rotor, 19, outer spacer, 20, inner spacer, 21, nut housing, 22, lead screw, 23, circular grating code disk, 24, reading head. DETAILED DESCRIPTION

[0030] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0031] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention and cannot be understood as limitations on the present invention.

[0034] In the present utility model, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present utility model can be determined according to specific circumstances, and they cannot be understood as limitations on the present utility model.

[0035] As described in the background technology, the nut of the hollow motor is fed linearly along the screw rod. During the process, the connection strength between the motor rotor and the transmission part and the brake part needs to be kept reliable to avoid breakage at the connection and prevent damage to the internal structure of the motor. On the other hand, in order to meet different transmission and braking requirements, the hollow motor needs to be replaced frequently, the matching applicability is low, and the versatility of the motor is poor. In the existing hollow motor, the motor rotor is directly connected to the transmission structure and the brake. The load at the connection is large, and the rotor is prone to breakage under high-speed rotation, causing the motor to be scrapped.

[0036] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

[0037] like Figure 1 and Figure 4 As shown, a hollow motor includes a motor structure, a transmission structure and a brake. The hollow motor as a whole is a central through hole structure. The screw rod 22 can be inserted into the central through hole of the hollow motor and is clearance-matched with the nut 3 of the transmission structure. The motor rotor 18 rotates to drive the nut 3 connected as an integral structure to rotate, thereby driving the hollow motor to feed linearly on the screw rod 22.

[0038] The front connecting member 4 of the transmission structure is designed as a hollow cylindrical boss structure, and the two end faces of the cylindrical boss are evenly distributed with connecting holes in the circumferential direction, wherein the end face structure closer to the central through hole is the inner ring, and the connecting holes of the inner ring are connected to the motor rotor 18; the end face structure farther from the central through hole is the outer ring, and the connecting holes of the outer ring are connected to the nut 3 of the transmission structure, and the front connecting member 4 connects the nut 3 and the motor rotor 18 into an integral structure. In addition, in this embodiment, the above-mentioned structures adopt a split design, and in other embodiments, an integrated structure design can also be adopted. A nut housing 21 is installed on the radial outer periphery of the nut 3, and the nut housing 21 is connected to the front end face of the motor housing 7. The nut housing 21 provides an installation space for the nut 3, supports and limits the feeding movement of the nut 3 relative to the screw rod 22, and a limiting structure is set between the nut 3 and the nut housing 21. Further, the limiting structure is designed on the outer peripheral wall of the nut 3, and cooperates with the front end face of the nut housing 21, which can be a step structure. A front end cover 1 is fixedly connected to the front end surface of the nut housing 21, and the front end cover 1 can ensure the sealing inside the nut housing 21. In order to enhance the sealing effect, an oil seal structure is added between the front end cover 1 and the nut housing 21, and a skeleton oil seal 2 can be used to seal to prevent external impurities from entering the matching position of the screw rod 22 and the nut 3, so that the transmission is more reliable.

[0039] like Figure 1 and Figure 6 As shown, two groups of angular contact ball bearings are provided at one end of the motor rotor 18 close to the front end cover 1, wherein the two groups of bearings are arranged back to back, thereby increasing the supporting area of ​​the bearings and improving the bearing capacity. The two groups of bearings are supported and positioned by an inner spacer 19 and an outer spacer 20, and a locking nut 5 is used at the front end of the bearing combination to limit the axial position of the bearing group; a group of deep groove ball bearings are provided at the rear end of the motor rotor 18, and an elastic retaining ring 17 is used on the rear end surface of the deep groove ball bearing for positioning and support; the arrangement of the above bearings ensures the smooth rotation of the motor rotor 18.

[0040] like Figure 1 , Figure 3 and Figure 5As shown, the rear end face of the motor housing 7 is connected to the circular grating housing 16, the rear end face of the circular grating housing 16 is connected to the brake housing 15, and the rear end face of the brake housing 15 is connected to the motor rear cover 12. The brake housing 15 is also a hollow housing structure, and the brake and the rear connecting member 9 are arranged in the internal space of the brake housing 15. The brake includes a brake electromagnet 11, which is fastened to the motor rear cover 12 by screws, a brake armature 14 is connected to the armature fixing member 10 as a whole, and is threadedly fastened to the connecting hole on the outer ring of the rear connecting member 9 through the armature fixing member 10, and the inner ring connecting hole of the rear connecting member 9 is connected to the motor rotor 18, and the rear connecting member 9 connects the motor rotor 18 and the armature fixing member 10 as a whole. A gap is provided between the brake electromagnet 11 and the brake armature 14 along the direction of the screw rod 22, which is used for the brake electromagnet 11 to be powered on and off so as to attract the brake armature 14, increase or eliminate the friction between the two, and achieve the purpose of controlling the rotation of the motor rotor 18 and braking. The motor rear cover 12 is also designed as a hollow disc structure, with connection holes evenly distributed around the circumference, providing a connection position for the brake electromagnet 11. Since the motor rear cover 12 is a hollow structure, a seal 13 needs to be provided between the hollow position and the brake to prevent the entry of impurities and dust, and ensure the normal operation of the brake.

[0041] like Figure 1 , Figure 2 As shown, the inner space of the circular grating housing 16 is provided with a circular grating code disk 23 and a reading head 24, wherein the circular grating code disk 23 is assembled between the rear connecting member 9 and the motor rotor 18. The circular grating fixing member 8 is a hollow circular ring structure, and a mounting hole is provided on the end face of the circular ring for axially fixed connection with the circular grating code disk 23, and a locking screw is radially designed for fixing on the motor rotor 18 in the radial direction. The reading head 24 is fastened to the inner wall of the circular grating housing 16 by screws, and is used to detect the rotational angular displacement of the circular grating code disk 23.

[0042] The rotatable part of the entire hollow motor includes a nut 3, a front connecting part 4, a motor rotor 18, a circular grating code disk 23, a rear connecting part 9, an armature fixing part 10 and a brake armature 14; the front end in the above embodiment refers to the end close to the transmission structure, and the rear end refers to the end close to the brake.

[0043] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0044] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A hollow motor, characterized in that: include: A transmission structure, the transmission structure comprising a nut (3), the nut (3) being loosely matched with a screw rod (22) passing through a hollow motor; the transmission structure also comprising a front connecting member (4), the outer ring of the front connecting member (4) being integrally connected to the nut (3), the inner ring of the front connecting member (4) being fastened to a motor rotor (18), the motor rotor (18) rotating to drive the nut (3) to rotate and feed linearly along the screw rod (22); A motor structure, the motor structure comprising a motor housing (7), the motor housing (7) being a hollow housing, a motor stator (6) being fixedly mounted on the inner wall of the motor housing (7), a motor rotor (18) being correspondingly arranged radially inside the motor stator (6), and a rear connecting member (9) being connected to one end of the motor rotor (18) away from the front connecting member (4); The brake comprises a brake electromagnet (11), a brake armature (14) and an armature fixing member (10); the brake armature (14) is connected to the outer ring of a rear connecting member (9) via the armature fixing member (10); the brake electromagnet (11) is energized to control the attraction with the brake armature (14).

2. The hollow motor according to claim 1, characterized in that: A nut housing (21) is mounted on the radial outer periphery of the nut (3), a limiting structure is provided between the nut (3) and the nut housing (21), the limiting structure limits the relative position of the nut (3) along the axial movement of the screw rod (22), and the limiting structure is a step structure.

3. The hollow motor according to claim 2, characterized in that: A front end cover (1) is fixedly connected to the front end surface of the nut housing (21), and an oil seal structure is used to seal the front end cover (1) and the nut (3).

4. The hollow motor according to claim 1, characterized in that: At least two groups of angular contact ball bearings are arranged between one end of the motor rotor (18) close to the front connecting piece (4) and the motor housing (7), and each group of angular contact ball bearings is supported and positioned axially by an inner spacer (20) and an outer spacer (19).

5. The hollow motor according to claim 1 or 4, characterized in that: A deep groove ball bearing is radially mounted on one end of the motor rotor (18) close to the rear connecting piece (9) and the motor housing (7), and an elastic retaining ring (17) is used to clamp the motor rotor (18) and the deep groove ball bearing.

6. The hollow motor according to claim 1, characterized in that: A brake housing (15) is provided on the outside of the brake, and the brake housing (15) is a hollow shell structure. The brake and the rear connecting piece (9) are both arranged in the internal cavity of the brake housing (15).

7. The hollow motor according to claim 6, characterized in that: The brake electromagnet (11) is connected to the motor rear cover (12), the brake armature (14) is screwed to the armature fixing member (10), a gap is provided between the brake electromagnet (11) and the brake armature (14) along the direction of the screw rod (22), the motor rear cover (12) is a hollow disc structure, and a seal is provided between the hollow position of the motor rear cover (12) and the brake.

8. The hollow motor according to claim 6, characterized in that: A circular grating housing (16) is axially installed between the brake housing (15) and the motor housing (7), and a circular grating code disk (23) and a reading head (24) are arranged in the circular grating housing (16).

9. The hollow motor according to claim 8, characterized in that: The circular grating code disk (23) is assembled between the rear connecting member (9) and the electronic rotor (18), and is axially connected to the circular grating fixing member (8). The circular grating fixing member (8) is radially locked on the motor rotor (18), and the connecting hole on the inner ring of the rear connecting member (9) is axially fastened to the rear end of the motor rotor (18); the reading head (24) is fixedly connected to the inner wall of the circular grating housing (16) to detect the rotational angular displacement of the circular grating code disk (23).

10. The hollow motor according to claim 1, characterized in that: The front connecting piece (4) and the rear connecting piece (9) are both hollow cylindrical boss structures, and the end surfaces of the inner ring and the outer ring of the hollow cylindrical boss structure are uniformly distributed with connecting holes in the circumferential direction.

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