TW202004055A - Electric cylinder - Google Patents

Abstract

An electric cylinder includes a main body having a through hole longitudinally defined therein. A piston is movably received in the through hole, wherein the piston has a first end out of the main body and a second end received in the through hole. A bolt is longitudinally mounted to the second end of the piston. A threaded rod is threaded and extends through the bolt. The piston is reciprocally moved relative to the main body when the threaded rod is rotated due to a rotary power source. A pre-pressed adjuster is sleeved on the second end of the piston. The pre-pressed adjuster has at least two resilient plates extending therefrom toward the first end of the piston. The at least two resilient plated is outwardly expanded and abut against an inner periphery of the through hole to promoted the stability of the moving piston when the pre-pressed adjuster is moved toward the first end of the piston.

Description

Electric cylinder

The invention relates to an electric cylinder; in particular, it refers to an innovative structural designer who improves the stability of the movement of a stopper rod through a pressure regulator.

Generally speaking, the electric cylinder usually has an electric cylinder body, a plug rod installed in the electric cylinder body, the plug rod is accommodated in one end of the electric cylinder body, a screw sleeve and a lock are installed A screw penetrating the screw sleeve is provided. When the screw is driven by an external rotating power source and reciprocates in rotation relative to the electric cylinder body, the screw rod can be driven relative to the plug rod through its screwing relationship with the screw sleeve. The electric cylinder body moves axially reciprocatingly.

In view of the foregoing deficiencies, some electric cylinder manufacturers use a spline structure to overcome the problem of clearance. However, because the spline structure is equipped with continuously circulating balls, in order to smooth the movement of the balls, it is necessary to apply Grinding process, the production cost is quite high, and during the grinding process, it can only be processed one by one, which is quite time-consuming. Furthermore, the overall thickness of the electric cylinder with a spline structure must be due to the arrangement of the reflow components. Increasing the size will have a negative impact on the weight and size of the electric cylinder.

The main object of the present invention is to solve the aforementioned problems and provide an electric cylinder equipped with a preload adjuster, so as to improve the stability of the electric cylinder during operation.

Based on the foregoing purpose, the present invention mainly includes an electric cylinder body formed with a perforation in the axial direction; a plug rod penetrating through the perforation; the plug rod has a first end and a second end. The first end extends out of the electric cylinder body, the second end of the plug rod forms an accommodating space axially; a screw sleeve axially mounted on the second end of the plug rod; a screw lock penetrates the screw sleeve The screw is partially accommodated in the accommodating space and is connected to a rotating power source; when the screw is driven by the rotating power source, it reciprocates relative to the electric cylinder body , The plug rod is axially reciprocating relative to the body of the electric cylinder; a set of preload adjusters at the second end of the plug rod restrict the plug rod relative to the body of the electric cylinder Rotation; the pre-pressure regulator is extended toward the first end of the plug rod with at least two expansion pieces, and the inner side of each expansion piece is attached to the surface of the plug rod; by adjusting the pre-pressure regulator Relative to the axial position of the stopper rod, the expansion degree of the at least two expansion tabs can be adjusted so that the outer sides of the at least two expansion tabs abut against the wall surface of the perforation to increase the stability of the stopper rod when it moves axially .

Please refer to Figures 1, 2, and 3, which are preferred embodiments of the electric cylinder of the present invention, but these embodiments are for illustrative purposes only, and are not limited by this structure in the patent application; the electric cylinder It includes an electric cylinder body 10 with a through hole 11 formed axially; a plug rod 20 inserted through the through hole 11; the plug rod 20 has a first end and a second end, the first of the plug rod 20 The end extends out of the electric cylinder body 10, and the second end of the plug rod 20 forms an accommodating space 21 axially; a screw sleeve 30 axially mounted on the second end of the plug rod 20; a screw lock penetrates The screw 40 of the screw sleeve 30 is partially accommodated in the accommodating space 21 and is connected to a rotating power source (not shown); when the screw 40 is affected by the rotating power source Drive, and when reciprocatingly rotates relative to the electric cylinder body 10, the plug rod 20 performs axial reciprocating movement relative to the electric cylinder body 10; a set of pre-pressure adjustment provided at the second end of the plug rod 20 50, the pre-pressure adjuster 50 restricts the rotation of the stopper rod 20 relative to the electric cylinder body 10; the pre-pressure adjuster 50 is provided with at least two expansion pieces 51 extending toward the first end of the stopper rod 20, and The inner side of each expansion piece 51 is attached to the surface of the plug rod 20; by adjusting the axial position of the preload adjuster 50 relative to the plug rod 20, the expansion degree of the at least two expansion pieces 51 can be adjusted So that the outer side of the at least two expansion pieces 51 abuts against the wall surface of the through hole 11 to improve the stability of the stopper rod 20 when it moves axially.

The outer ring of the stopper rod 20 is provided with a pushing section 22 whose diameter gradually decreases toward its second end, and the inner side of the at least two expansion pieces 51 abuts against the pushing section 22. As shown in FIG. 2, in the preferred embodiment selected for the present invention, the pushing section 22 has a straight tapered surface. Please further refer to FIG. 3 and FIG. 4, the inner surface of each expansion piece 51 is provided with a guide surface 511, and the guide surface 511 of each expansion piece 51 is pressed against the pushing section 22, Thereby, the stability of movement of each expansion piece 51 when expanding or contracting outward is improved. In a preferred embodiment of the present invention, the guide surface 511 is designed with a slope, so that each expansion piece 51 is a structure whose thickness gradually decreases toward its free end. Of course, the pushing section 22 can also be arranged in a stepped shape; or the pushing section 22 can be kept in the original straight tapered surface, and the guiding surface 511 of each expansion piece 51 can be arranged in a stepped shape, which can also be The purpose of adjusting the expansion degree of the at least two expansion pieces 51 by adjusting the axial position of the preload adjuster 50 relative to the plug rod 20 is achieved.

As shown in FIG. 3, a weakened portion 512 is formed on both sides of the root of each expansion piece 51 to reduce the reaction force of the at least two expansion pieces 51 when expanding outward, which is convenient for adjusting the preload regulator 50 relative to The axial position of the plug rod 20.

The second end of the plug rod 20 is provided with a threaded section 23, and the preload adjuster 50 is formed with a through hole 52 along its axis, and a threaded portion 521 is provided on the inner wall of the through hole 52 of the preload adjuster 50. The threaded portion 521 is locked on the threaded section 23; when the preload adjuster 50 rotates relative to the stopper rod 20, the axial position of the preload adjuster 50 relative to the stopper rod 20 can be adjusted.

Please refer to FIG. 6 which is the second preferred embodiment of the present invention. In this preferred embodiment, the second end of the plug rod 20 is also provided with a threaded section 23, and the preload adjuster 50A is formed with a through hole 52A having a smooth inner wall along its axis, the preload regulator 50 is sleeved on the second end of the plug rod 20; the plug rod 20 further includes a lock disposed on the threaded section 23 The nut 24 can adjust the axial position of the preload adjuster 50A relative to the plug rod 20 when the nut 24 rotates relative to the plug rod 20.

With the above structural design, the following describes the operation of the present invention as follows: As shown in FIGS. 4 and 5, when the preload adjuster 50 rotates relative to the stopper rod 20, and by guessing the rod 20 When the threaded portion 23 and the threaded portion 521 of the preload adjuster 50 are screwed, and the preload adjuster 50 is forced to move in the direction indicated by the arrow 60 in the direction of the first end of the plug rod 20, the plug The pushing section 22 on the rod 20 will use the guide surface 511 provided on the inner side of each expansion piece 51 to push each expansion piece 51 out at an equal distance, and the outer side of each expansion piece 51 is equal The pressure of abuts against the inner wall of the through hole 11 in the electric cylinder body 10 to provide the purpose of anti-backlash. Therefore, when the screw 40 is driven by the rotating power source and reciprocates relative to the screw sleeve 30, the plug rod 20 can be driven to reciprocate axially relative to the electric cylinder body 10 through the screw sleeve 30 Movement, when the plug rod 20 reciprocates axially with respect to the electric cylinder body 10, the outer side wall gap of each expanded piece 51 is attached to the inner wall of the through hole 11 in the electric cylinder body 10, so The plug rod 20 can be given proper support to ensure that the movement trajectory of the first end of the plug rod 20 can correspond to the axis of the plug rod 20 as much as possible to improve the stability of the plug rod 20 when it is actuated.

In summary, the preferred embodiment of the present invention does have at least the following advantages in terms of the processing process and the product itself. Firstly, in the preferred embodiment of the present invention, the cross section of the perforation 11 formed in the electric cylinder body 10 adopts a polygonal design, which can not only directly limit the rotation of the preload regulator 50 relative to the electric cylinder body 10, In the processing of the electric cylinder body 10, a plurality of electric cylinder bodies 10 can be simultaneously processed using a broaching machine. Furthermore, the perforation 11 with a polygonal cross section is also convenient for subsequent grinding processing, which can effectively reduce the electric cylinder body 10 Of course, the production cost of the electric cylinder also relatively reduces the selling price of the electric cylinder and improves the market competitiveness of the electric cylinder. In addition, due to the special structural design of the present invention, the expansion piece 51 of the preload regulator 50 can be used to achieve the purpose of anti-backlash and improve the stability of the operation without using a spline structure, so compared with the traditional electric cylinder In other words, the overall thickness can be reduced, so that the electric cylinder can move toward the goal of lightening and thinning.

10 ‧‧‧Electric cylinder body 11 ‧ ‧ ‧ perforation 20 ‧ ‧ ‧ plug rod 21 ‧ ‧ ‧ accommodation space 22 ‧ ‧ ‧ push and pull section 23 ‧ ‧ ‧ thread section 24 ‧ ‧ ‧ nut 30 40 ‧‧‧ Screw 50, 50A ‧arrow

Figure 1 is a perspective external view of the present invention. Fig. 2 is an exploded perspective view of the present invention. Figure 3 is a perspective external view of the preload adjuster of the present invention. Fig. 4 is a schematic diagram of the operation of the preload adjuster of the present invention to adjust the radial expansion degree of the expansion piece. Fig. 5 is a schematic diagram of the action of the present invention driving the push rod to perform axial reciprocating motion. FIG. 6 is a partial perspective exploded view of the second preferred embodiment of the present invention.

10‧‧‧Electric cylinder body

11‧‧‧Perforation

20‧‧‧plug

22‧‧‧ Promotion section

30‧‧‧Sleeve

40‧‧‧screw

51‧‧‧Expansion

511‧‧‧Guiding surface

Claims (10)

An electric cylinder mainly includes: 　　 an electric cylinder body, a bore is axially formed in the electric cylinder body; 　　 a plug rod inserted in the bore; the plug rod has a first end and a second End, the first end of the stopper rod extends out of the electric cylinder body, and the second end of the stopper rod forms an accommodating space axially; 　　 an axially mounted screw sleeve at the second end of the stopper rod; 　　一A screw lock penetrates the screw of the screw sleeve, and the screw is partially accommodated in the accommodating space and is connected to a rotating power source; when the screw reciprocates to rotate relative to the electric cylinder body, the plug rod It is an axial reciprocating motion relative to the electric cylinder body; 　　 A set of preload adjuster provided at the second end of the stopper rod, the preload adjuster restricts the rotation of the stopper rod relative to the electric cylinder body; The pressure adjuster extends toward the first end of the plug rod with at least two expansion pieces, and the inner side of each expansion piece is attached to the surface of the plug rod; by adjusting the pre-pressure adjuster relative to the plug The axial position of the rod can adjust the degree of expansion of the at least two expansion pieces so that the outer sides of the at least two expansion pieces abut against the wall surface of the perforation, thereby improving the stability of the stopper rod when moving axially. The electric cylinder as described in item 1 of the patent application scope, wherein the outer surface of the stopper rod is provided with a push-out section whose diameter gradually decreases toward its second end, and the inner side of the at least two expansion pieces is in contact with The promotion section. The electric cylinder as described in item 2 of the patent application scope, wherein the pushing section is arranged in a stepped shape. The electric cylinder as described in item 2 of the patent application scope, wherein the inner side of each expansion piece is provided with a guide surface, and the guide surface of each expansion piece is in contact with the pushing section. The electric cylinder as described in item 4 of the patent application scope, wherein the guide surface is designed with an inclined plane, so that each expansion piece is a structure whose thickness gradually decreases toward its free end. The electric cylinder as described in item 4 or 5 of the patent application scope, wherein the second end of the plug rod is provided with a threaded section, and the preload adjuster is formed with a perforation along its axis, and the preload adjuster is perforated A threaded portion is provided on the inner wall, and the threaded portion is locked on the threaded section; when the preload adjuster rotates relative to the stopper rod, the axial direction of the preload adjuster relative to the stopper rod can be adjusted position. The electric cylinder as described in item 4 or 5 of the patent application scope, wherein the second end of the plug rod is provided with a threaded section, and the preload adjuster is formed with a perforation along its axis, the preload adjuster sleeve is It is provided on the second end of the plug rod; the plug rod further includes a nut locked on the threaded section, and when the nut is rotated relative to the plug rod, the preload adjuster can be adjusted relative to The axial position of the plug rod. The electric cylinder as described in item 1 of the patent application scope, wherein a weakened portion is formed on both sides of the root of each expansion piece to reduce the reaction force when the at least two expansion pieces expand outwards, which is convenient for adjusting the preload regulator Relative to the axial position of the plug rod. According to the electric cylinder described in item 6 of the patent application scope, a weakened portion is formed on both sides of the root of each expansion piece to reduce the reaction force when the at least two expansion pieces expand outward, which is convenient for adjusting the pre-pressure regulator Relative to the axial position of the plug rod. The electric cylinder as described in item 7 of the patent application scope, wherein a weakened portion is formed on both sides of the root of each expansion piece to reduce the reaction force when the at least two expansion pieces expand outwards, which is convenient for adjusting the preload regulator Relative to the axial position of the plug rod.

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