TWM570381U - Motor module with protection sleeve for screw rod - Google Patents

Abstract

A motor module includes a motor, a screw rod, and a protection sleeve. The motor includes a rotor having a through-hole therein. A nut is mounted in the rotor and can be driven to rotate together with the rotor. 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. The protective sleeve is mounted around an outer end of the screw rod and includes a plurality of sleeve bodies with different diameters. When the screw rod is moved back and forth relative to the rotor in the longitudinal direction, the sleeve bodies will stretch or contract as the screw rod moves.

Description

Motor module with screw guard

The present invention relates to a motor module, and more particularly to a motor module having a screw guard.

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 the present invention is to provide a motor module with a screw guard sleeve, which is designed with an innovative structure to reduce the structure and volume of the motor module, thereby improving the working efficiency and competitiveness of the electric cylinder.

A motor module according to an embodiment of the present invention includes a motor, a screw, and a protective cover. The screw has inner and outer ends spaced along a longitudinal direction and is reciprocated back and forth by the motor. The elastically stretchable protective sleeve is disposed at an outer end of the screw and includes a plurality of cylinders having different diameters, the plurality of cylinders are sleeve-connected to each other and have a central hole to provide the screw through, wherein When the screw moves back and forth relative to the motor, the plurality of sleeves of the protective sleeve expand or contract as the screw moves.

In one embodiment the motor includes a rotor having a bore therein, and a nut is mounted within the rotor, the nut being rotatable together with the rotor. The inner end of the screw passes through the nut and is received within a perforation of the rotor, the screw forming a relatively movable combination with the nut. As the rotor rotates, the screw is driven to move back and forth relative to the rotor along the longitudinal direction.

In one embodiment, the motor module is mounted in a body of an electric cylinder, the front end of the body has an opening, and a receiving ring is mounted in the opening, and a center of the receiving ring has a shaft hole to provide the screw through, And the receiving ring is provided with a recess to provide the protective cover.

In one embodiment, the outer end of the screw extends outside the rotor and is coupled to a force output shaft. When the screw moves forward relative to the rotor along the longitudinal direction, the outer end of the screw protrudes from the front end of the body. And the protective sleeve automatically expands into a long cylinder completely covering the protruding portion of the screw. When the screw moves backward relative to the rotor, the outer end of the screw protrudes into the opening of the body, and the protective sleeve is The fixing plate is compressed into a short cylinder to be housed in the housing ring.

In one embodiment, the largest diameter cylinder of the protective sleeve abuts against the inner wall of the recess of the receiving ring, and the smallest diameter cylinder abuts against the end surface of the fixing plate facing the front end.

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 according to the present invention is applied to an electric cylinder 12, and the electric cylinder 12 includes a body 14 mounted in a chamber 15 inside the body 14 and usable for use. The carriage 16 that drives the top of the electric cylinder 12 performs linear movement. It should be noted that the motor module 10 of the present invention can be applied to a device that uses a motor to drive the screw to linearly move the load end, and thus does not limit the application range and field of the motor module 10.

The motor module 10 includes a motor 18 and a screw 20 that is reciprocated by the motor 18. 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 receiving ring 64 is mounted in the opening 53 of the body 14. The center of the receiving ring 64 has a shaft hole 66 for providing the screw 20 to pass through, and the outer end of the receiving 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 receiving 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. A short cylinder that is compressed to become a truncated cone is housed in the housing 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, thereby reducing 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, so that the structure of the motor module 10 can be reduced and the application range and working efficiency of the motor module 10 can be improved. In addition, when the screw 20 moves forward relative to the rotor 24 and protrudes from the front end 52 of the body 14, the protective cover 62 can automatically extend to completely cover the exposed portion of the screw 20, so that the screw 20 has dustproof and waterproof gas. 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‧‧‧ Storage 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 (6)

A motor module having a screw guard, comprising: a motor; a screw having an inner end and an outer end spaced along a longitudinal direction, and being driven by the motor to reciprocate back and forth; and an elastically stretchable protective cover And the outer end of the screw is sleeved and includes a plurality of cylinders having different diameters, the sleeves are sleevedly coupled to each other and have a central hole to provide the screw through, wherein the screw is opposite to the longitudinal direction of the screw When the rotor moves back and forth, the number of cylinders of the protective sleeve expands or contracts as the screw moves. The motor module of claim 1, wherein the motor comprises a rotor, the rotor has a through hole therein, and a nut is mounted in the rotor, and the nut is driven to rotate together with the rotor. An inner end of the screw passes through the nut and is received within a bore of the rotor, the screw forming a relatively movable combination with the nut, wherein the screw is driven relative to the rotor along the longitudinal direction as the rotor rotates Move back and forth. The motor module of claim 2, wherein the motor module is mounted in a body of an electric cylinder, the body has a front end, the front end has an opening, and a receiving ring is mounted in the opening, the receiving The center of the ring has a shaft hole to provide passage of the screw, and the housing ring is provided with a recess to provide the sleeve accommodation. The motor module of claim 3, wherein the outer end of the screw protrudes outside the rotor and is coupled to a output shaft fixing plate, and when the screw moves forward relative to the rotor along the longitudinal direction, The outer end of the screw extends out of the front end of the body, and the protective sleeve automatically expands into a long cylinder completely covering the protruding portion of the screw. When the screw moves backward relative to the rotor, the outer end of the screw protrudes into the The inside of the opening of the body, and the protective sleeve is compressed by the fixing plate into a short cylinder to be received in the receiving ring. The motor module of claim 4, wherein the largest diameter cylinder of the protective sleeve abuts against an inner wall of the recess of the receiving ring, and the smallest diameter cylinder abuts against the surface of the fixing plate The end face of the front end of the body. The motor module of claim 4, wherein the top of the body has a sliding seat, the sliding seat is coupled with the fixing plate, and when the screw moves relative to the rotor along the longitudinal direction, the fixing plate is The carriage will move along the longitudinal direction with the screw.