TWM570382U - Motor module for electric actuator - Google Patents

Abstract

A motor module for an electric actuator is mounted in a body of the electric actuator to drive a slide of the electric actuator for a linear movement. The motor module includes a motor and a screw rod. The motor includes a stator and a rotor received in the stator. The rotor is a sleeve having a through-hole therein. A nut is mounted in the rotor and can be driven to rotate together with the rotor by the stator. One end of the screw rod passes through the nut and is accommodated in the through-hole of the rotor, with the screw rod and the nut forming a relatively movable combination. When the rotor rotates, the screw rod is driven to move relative to the rotor in a longitudinal direction.

Description

Electric cylinder motor module

The present invention relates to a motor module, and more particularly to a motor module for an electric cylinder.

The electric cylinder system widely used in industrial machines is powered by a motor, and then driven by a screw, so that the load end can move linearly. In particular, when the screw is driven to rotate by the motor, the slider engaged with the screw can move relative to the linear track, so that the working mechanism on the carrier can be driven to move linearly. A screw of a conventional electric cylinder is connected to the shaft of the motor by a coupling, so that the rotation of the screw can be driven by the coupling when the motor is in operation. However, under long-term use, the coupling is prone to damage or looseness. In addition, the flexibility error caused by the coupling will also reduce the accuracy and reduce the working efficiency of the device. Another conventional electric cylinder screw is directly connected to the motor shaft (the rotor of the motor), so that the motor will drive the screw to rotate together, and the rotary motion of the screw is converted into linear motion of the slider, thereby improving the coupling. The problem that arises. However, such an electric cylinder has many structural components and a large volume, and cannot effectively save space for the purpose of weight reduction.

In view of this, the creator has carefully studied and designed, and now has the creation of this creation. Therefore, the main purpose of this creation is to provide a motor module for an electric cylinder, which is designed with an innovative structure to reduce the structure of the electric cylinder and reduce the volume of the electric cylinder, thereby improving the working efficiency and competitiveness of the electric cylinder.

A motor module according to an embodiment of the present invention is mounted in a body of an electric cylinder to drive a slide of the electric cylinder for linear movement. The motor module includes a motor and a screw. The motor includes a stator and a rotor positioned within the stator and rotatable by the stator. The rotor is a sleeve having a bore therein and a nut is mounted in the rotor. The screw has an inner end and an outer end spaced along a longitudinal direction, the inner end passing through the nut and being received in a perforation of the rotor, the rod diameter of the screw being smaller than the diameter of the perforation, and the screw and the nut Form a combination of relative motion. As the rotor rotates, the nut is rotated and the screw is driven to move relative to the rotor along the longitudinal direction.

In an embodiment, the nut has a spiral inner groove inside, and the outer periphery of the screw has a spiral outer groove, and the outer groove has a ball between the inner groove of the nut, so that As the nut rotates, the screw is driven to move relative to the nut along the longitudinal direction.

In one embodiment, the rotor has a first end and a second end spaced along the longitudinal direction, the first end is mounted with an encoder disc holder, the second end having an enlarged portion, the enlarged portion of the perforation The wall is provided with a plurality of grooves spaced along the peripheral direction, the nut being mounted in the enlarged portion and the outer periphery of the nut being provided with a plurality of protrusions spaced along the circumferential direction for engaging with the plurality of grooves.

In one embodiment, the body has a front end, the outer end of the screw projecting outside the second end of the rotor and located in the front end, when the screw moves forward relative to the rotor along the longitudinal direction, The outer end of the screw will extend beyond the front end of the body.

Other objects, advantages and features of the present invention are apparent from the following detailed description of the preferred embodiments.

There are many different structural embodiments of this creation. A preferred embodiment of the present invention will now be described by way of example only and not by way of limitation,

1 to 3 show that the motor module 10 constructed according to the present invention is applied to an electric cylinder 12, and the electric cylinder 12 includes a body 14 that is mounted in a chamber 15 inside the body 14 and is available. The carriage 16 that drives the top of the electric cylinder 12 is linearly moved.

The motor module 10 includes a motor 18 and a screw 20. The motor 18 is, for example, a servomotor or a step motor, and the screw 20 is, for example, a ball screw. Referring to Figures 4 and 5, the motor 18 includes a stator 22, a rotor 24 that passes through the interior of the stator 22, and at least one permanent magnet 26 disposed between the stator 22 and the rotor 24. The rotor 24 is a sleeve having a bore 28 therein and has a first end 30 and a second end 32 spaced along a longitudinal direction. The first end 30 is mounted with a bearing 33 and an encoder disc holder 34. The encoder senses the rotational position of the rotor 24 and feeds back information to the control system. The second end 32 has an enlarged portion 36 in which a nut 38 is mounted, and the nut 38 rotates together with the rotor 24. In the present embodiment, the outer periphery of the enlarged portion 36 is mounted with a bearing 39 and the inner wall of the through hole 28 of the enlarged portion 36 is provided with a plurality of grooves 40 partitioned along the circumferential direction, and the outer periphery of the nut 38 is provided A plurality of projections 42 spaced along the peripheral direction are used to engage the number of grooves 40 such that the nut 38 is firmly coupled to the rotor 24. Further, the inside of the nut 38 has a spiral inner groove 44 to accommodate a ball (not shown). The magnet 26 surrounds the outer periphery of the rotor 24. The rotor 24 is rotated together with the nut 38 by the electromagnetic effect generated by the stator 22.

The screw 20 has an inner end 46 and an outer end 48 spaced along the longitudinal direction, the inner end 46 passing through the nut 38 and received within a bore 28 of the rotor 24, the outer end 48 extending over the rotor 24. The outer side of the second end 32. The rod 20 has a rod diameter smaller than the diameter of the perforation 28, and the outer periphery of the screw 20 has a spiral outer groove 50 opposite to the inner groove 44 of the nut 38, such that the nut The balls in 38 can roll in the outer groove 50. Thus, as the rotor 24 rotates, the nut 38 that rotates with the rotor 24 is not displaced, so that the screw 20 is driven to move relative to the rotor 24 along the longitudinal direction.

In the present embodiment, the body 14 has a front end 52 having an opening 53 that communicates with the chamber 15 inside the body 14. When the screw 20 is moved forward relative to the rotor 24 along the longitudinal direction, the outer end 48 of the screw 20 extends out of the front end 52 of the body 14 via the opening 53 (see Fig. 6). Furthermore, the outer end 48 of the screw 20 is coupled to a power shaft fixing plate 54. In this embodiment, the outer end 48 of the screw 20 has a coupling hole 56 through which a connecting member 58 passes through the fixing plate 54 and The engagement hole 56 is locked to engage the fixed plate 54 with the outer end 48 of the screw 20. In addition, the fixing plate 54 and the sliding seat 16 are coupled by a connecting member (for example, a screw) 60 such that the fixing plate 54 and the sliding seat 16 are coupled to the rotating rod 24 when the screw 20 moves back and forth relative to the rotor 24 along the longitudinal direction. The screws 20 reciprocate together along the longitudinal direction.

The motor module 10 further includes an elastically stretchable protective cover 62. In the embodiment, a positioning ring 64 is mounted in the opening 53 of the body 14. The center of the positioning ring 64 has a shaft hole 66 to provide the screw 20, and the outer end of the positioning ring 64 is provided with a recess 68. The protective cover 62 is provided for accommodation. In the present embodiment, the protective cover 62 includes a plurality of cylinders 70 having different diameters, and the plurality of cylinders 70 may be made of a metal material and coupled to each other to form a multi-section sleeve having elastic stretch, and The sleeve has a central aperture 72 to provide access to the screw 20. The largest diameter cylinder 70 of the protective sleeve 62 abuts against the inner wall of the recess 68 of the positioning ring 64, and the smallest diameter cylinder 70 abuts against the end surface of the fixing plate 54 facing the front end 52, as shown in FIG. Shown. As the screw 20 moves back and forth relative to the rotor 24 along the longitudinal direction, the boot 62 will expand or contract. As shown in FIG. 6, when the screw 20 moves forward relative to the rotor 24, the outer end 48 of the screw 20 extends out of the front end 52 of the body 14 for a predetermined length, and the protective sleeve 62 utilizes the elasticity of the spring. The action automatically expands into a long cylinder that completely covers the extended portion of the screw 20, so that the portion of the screw 20 positioned outside the body 14 has a dustproof effect. In the other direction, when the screw 20 moves rearward relative to the rotor 24, the outer end 48 of the screw 20 extends into the opening 53 of the body 14 (see Fig. 1), and the protective cover 62 is retained by the fixing plate 54. The short cylinder that is compressed to become a truncated cone is housed in the positioning ring 64.

As described above, in the motor module 10 of the present invention, the screw 20 is threaded into the rotor 24 of the motor 18 and is movable by the rotor 24 to move back and forth relative to the rotor 24 along the longitudinal direction. Thereby, the motor module 10 of the present invention can reduce the configuration of the motor module 10 in addition to the use of the conventional coupling. In particular, when the motor 18 is not actuated, most of the screw 20 is housed in the rotor 24 of the motor 18, thereby reducing the longitudinal length of the motor module 10 and the electric cylinder 12, thereby reducing the length. The volume of the electric cylinder 12. Moreover, when the motor 18 is in operation, the screw 20 is not driven to rotate, but is directly moved back and forth relative to the rotor 24 in the rotor 24 to drive the slider 16 to move linearly, so that the screw 20 does not need to be further The linear motion of the slider 16 is converted by the connection of other components, which can reduce the structure of the motor module 10 and improve the application range and working efficiency of the motor module 10. In addition, when the screw 20 is moved forward relative to the rotor 24 and protrudes from the front end 52 of the body 14, the protective cover 62 can be automatically extended to completely cover the exposed portion of the screw 20, so that the screw 20 is dustproof and waterproof. Effect.

The foregoing is a description of a particular embodiment of the present invention, and it will be appreciated that various changes or modifications can be made in accordance with the design features of the present invention. Therefore, obvious substitutions and modifications to those skilled in the art will still be incorporated in the scope of the patent claimed by the present invention.

10‧‧‧Motor Module

12‧‧‧Electric cylinder

14‧‧‧Ontology

15‧‧ ‧ room

16‧‧‧Slide

18‧‧‧Motor

20‧‧‧ screw

22‧‧‧ Stator

24‧‧‧Rotor

26‧‧‧ magnet

28‧‧‧Perforation

30‧‧‧ first end

32‧‧‧second end

33‧‧‧ bearing

34‧‧‧ fixed seat

36‧‧‧Expanding Department

38‧‧‧ Nuts

39‧‧‧ bearing

40‧‧‧ Groove

42‧‧‧ convex

44‧‧‧ Inside trench

46‧‧‧Inside

48‧‧‧Outside

50‧‧‧ outer groove

52‧‧‧ front end

53‧‧‧ openings

54‧‧‧ fixed plate

56‧‧‧Combination hole

58‧‧‧Connecting parts

60‧‧‧Connecting parts

62‧‧‧ protective cover

64‧‧‧ positioning ring

66‧‧‧Axis hole

68‧‧‧ recess

70‧‧‧Cylinder

72‧‧‧Central hole

FIG. 1 is a cross-sectional view showing the application of the motor module of the present invention to an electric cylinder.

2 is a perspective view showing the electric cylinder of FIG. 1.

Figure 3 shows a partial exploded view of the electric cylinder of Figure 2.

4 is a partial exploded view of the motor module of FIG. 1.

Figure 5 is a cross-sectional view showing the component combination of the motor module of Figure 4.

Figure 6 is a schematic view showing the outward movement of the screw of the motor module of Figure 1.

Figure 7 shows a perspective view of the electric cylinder of Figure 6.

Claims (5)

A motor module of an electric cylinder having a body, the motor module being mounted in the body, the motor module comprising: a motor including a stator and a stator in the stator and being drivable by the stator a rotating rotor, the inner rotor having a perforated sleeve, a nut mounted therein; and a screw having an inner end and an outer end spaced along a longitudinal direction, the inner end passing through the nut And being received in the perforation of the rotor, the rod diameter of the screw is smaller than the aperture of the perforation, and the screw forms a relatively movable combination with the nut, wherein when the rotor rotates, the nut is driven to rotate and the nut is rotated The screw will be driven to move relative to the rotor along the longitudinal direction. The motor module of claim 1, wherein the inner portion of the nut has a spiral inner groove, and the outer circumference of the screw has a spiral outer groove, the outer groove and the nut There are balls between the inner grooves such that when the nut rotates, the screw is driven to move along the longitudinal direction. The motor module of claim 1 or 2, wherein the rotor has a first end and a second end spaced along a longitudinal direction, the first end being mounted with an encoder disc holder, the second end Having an enlarged portion, the perforated inner wall of the enlarged portion is provided with a plurality of grooves spaced along the circumferential direction, the nut is mounted in the enlarged portion, and the outer periphery of the nut is provided with a plurality of convex portions separated along the circumferential direction Used to combine with the number of grooves. The motor module of claim 1 or 2, wherein the body has a front end, the outer end of the screw protrudes outside the second end of the rotor and is located in the front end of the body, when the screw The outer end of the screw extends out of the front end of the body as it moves forward relative to the rotor. The motor module of claim 4, wherein the top of the body has a sliding seat, and the outer end of the screw is coupled with a power output shaft fixing plate, and the fixing plate is coupled with the sliding seat when the screw is along As the longitudinal direction moves relative to the rotor, the fixed plate and the carriage move along the longitudinal direction with the screw.