JPH059164U - Electric cylinder - Google Patents

Abstract

(57) [Summary] [Structure] The electromagnet brake unit 5 and the encoder unit 11 are coaxially attached to the drive unit 1 of the electric cylinder, and the output shaft 2 of the electric cylinder, the rotary shaft 6 of the electromagnet brake unit 5, and the encoder unit 11 are arranged. Plays 9 and 15 are provided at each connecting portion of the rotary shaft 12. [Effect] Even if an abnormal reaction force is applied to the output shaft 2, the influence is exerted on the electromagnet brake unit 5 and the encoder unit 1.
It never reaches 1. When the cylinder is assembled, the missing parts of some parts do not affect the entire post process. When repairing a cylinder, it is possible to replace parts with minimal effort.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an electric servo cylinder.

[0002]

[Prior Art]

 The present applicant has developed an electric servo-type cylinder (hereinafter, abbreviated as an electric cylinder) capable of stopping the expansion / contraction movement of the output rod at an arbitrary position, and has already published the application (Actual Publication No. 1-86457). Bulletin). The cylinder comprises a drive unit that extends to one side and has a drive shaft that has a threaded rod portion engraved with a screw and a motor that drives the output shaft to rotate about its axis. On the outer side surface, a cylinder main body that surrounds the screw rod portion and is concentric with the screw rod portion is fixed, and a special nut that is screwed with the screw rod portion is slidably fitted in the cylinder main body. An annular first support member is fixed to the tip of the cylinder body, and a cylindrical output rod having one end fixed to the special nut is slidably fitted in the first support member, and the output rod A second support member rotatably attached to the tip of the screw rod is slidably fitted therein, and an electromagnetic force is attached to the base end portion of the output shaft on the other outer surface of the drive unit. The rotating part of the brake and the encoder attached to the brake (position detection And a rotating portion fitted respectively), it has become covered configured by covering the brake and encoder.

[0003]

[Problems to be solved by the device]

 As is clear from the above description, in the conventional electric cylinder, the base end portion of the output shaft doubles as the rotary shaft of the electromagnetic brake and the rotary shaft of the encoder. Therefore, if an abnormal reaction force is applied to the output rod from the load side and the output shaft moves in the axial direction, the damage caused by this will not only affect the cylinder drive part but also the electric brake and encoder. In addition, since the members of the electromagnetic brake and encoder mounting parts have a laminated structure, if some of the members (such as the output shaft) run out during assembly of the cylinder, all subsequent processes will stop. Will end up. This resulted in a significant hindrance to production efficiency when assembling a large number of cylinders. On the other hand, when repairing the cylinder, it was necessary to disassemble and reassemble many members to replace some of them, which required a great deal of time and effort. The present invention has been made in view of such circumstances, and even if an abnormal reaction force is applied to the output shaft, the influence does not affect the electromagnetic brake or the encoder. It is an object of the present invention to provide an electric cylinder in which the defects of the members do not affect the entire post-process and the necessary members can be replaced with a minimum of labor and time at the time of repair.

[0004]

[Means for solving problems]

 In order to achieve the above object, the present invention unitizes the electromagnet brake and the encoder, respectively, and mounts them on the electric cylinder body, and also connects the output shaft of the electric cylinder, the rotary shaft of the electromagnet brake, and the rotary shaft of the encoder. The main point is to provide play in. That is, according to the present invention, an electromagnet brake unit is coaxially mounted on the back surface of the drive part of the electric cylinder, and an encoder unit is coaxially mounted on the back surface of the electromagnet brake unit. The tip of the rotary shaft in the unit is connected with some play in the axial direction, and the base end of the rotary shaft and the tip of the rotary shaft in the encoder unit are provided with some play in the axial direction. It is characterized by being connected.

[0005]

[Structure and action]

 Hereinafter, the present invention will be described in detail based on an embodiment. FIG. 1 is a longitudinal sectional view of an essential part of an electric cylinder according to the present invention. In the figure, 1 is a drive unit of an electric cylinder, and the drive unit 1 is composed of an output shaft 2, a motor 3 for rotationally driving the output shaft 2, and a cover member 4 for accommodating them. An electromagnet brake unit 5 is attached to the back surface of the drive unit 1. The unit 5 is composed of a rotary shaft 6, a brake main body 7 wound around the rotary shaft 6, and a cover member 8 for accommodating them, and the cover member 8 is attached to the back surface of the cover member 4 in the drive unit 1 through a bolt. It is integrated with the drive unit 1 by tightening and fixing. The rotary shaft 6 and the output shaft 2 are coaxial with each other, and the base end portion of the output shaft 2 and the front end portion of the rotary shaft 6 are formed into a joint that can be slidably fitted to each other. When the electromagnet brake unit 5 is attached to the cylinder drive unit 1, the both joints are fitted and connected to each other so that the output shaft 2 and the rotary shaft 6 rotate in synchronization with each other. Also, there is some play 9 in the axial direction between the two joints, even if the output shaft 2 moves slightly in the direction of arrow A along the axis due to an abnormal reaction force from the load side. The play is absorbed by the play 9 so that no force is transmitted to the rotary shaft 6.

An encoder (position detector) unit 11 is attached to the back surface of the electromagnet brake unit 5. The unit 11 is composed of a rotary shaft 12, a detector main body 13 wound around the rotary shaft 12, and a cover member 14 for accommodating them, and the cover member 14 is attached to the cover member 8 of the electromagnet brake unit 5 through a bolt. The brake unit 5 is integrated by tightening and fixing it on the back surface. The rotary shaft 12 of the encoder unit 11 and the rotary shaft 6 of the brake unit 5 are coaxial with each other, and the base end portion of the latter and the tip end portion of the former are formed into a joint that can be slidably fitted to each other. However, when the encoder unit 11 is attached to the brake unit 5, the both joints are fitted and connected to each other so that the both rotary shafts 6 and 12 rotate in synchronization with each other. There is a slight play 15 between the two joints in the axial direction. Even if the rotary shaft 6 of the electromagnet brake unit 5 moves slightly in the direction of arrow A along the axial line, there is a gap between the two joints. The play 15 absorbs the movement so that no force is transmitted to the rotary shaft 12 of the encoder unit 11.

[0007]

[Effect of the device]

 According to the present invention as described above, when an abnormal reaction force is applied to the output rod of the electric cylinder from the load side and the output shaft 2 moves in the direction of arrow A in FIG. Since the play 9 between the rotary shaft 6 of the electromagnet brake unit 5 adjacent to is absorbed, the electromagnet brake unit 5 is not damaged. Further, when the moving distance of the output shaft 2 is so large that it cannot be absorbed by the play 9, and as a result, the shaft 6 also moves in the direction of arrow A in FIG. 1 along the axis line, the encoder unit 11 adjacent to the rotary shaft 6 is moved. Since the play 15 with the rotating shaft 12 absorbs this movement, the encoder unit 11 is not damaged. Further, in the present invention, since the electromagnet brake unit 5 is attached to the electric cylinder drive unit 1 and the encoder unit 11 is attached to the electromagnet brake unit 5 via bolts, respectively, a large number of electric cylinders are assembled. In this case, the work can be carried out in each unit. As a result, even if some parts (such as the output shaft) are out of stock, the effects do not affect the entire other assembly work and the waiting time can be minimized. On the other hand, when repairing a cylinder, when replacing it, only the unit that includes the member that needs to be replaced is targeted, so the labor and time required for disassembling and reassembling the member can be minimized.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of an electric cylinder according to the present invention.

[Explanation of symbols]

 1 Electric Cylinder Drive 2 Output Shaft 5 Electromagnetic Brake Unit 6 Rotating Shaft 9 Play 11 Encoder Unit 12 Rotating Shaft 15 Play

Claims (1)

[Claims for utility model registration] 1. An electromagnet brake unit 5 is coaxially attached to the rear surface of the drive unit 1 of the electric cylinder, and an encoder unit 11 is coaxially attached to the rear surface of the electromagnet brake unit 5 to drive the cylinder. The base end of the output shaft 2 in the portion 1 and the tip end of the rotary shaft 6 in the electromagnet brake unit 5 are connected by providing some play 9 in the axial direction, and the base end of the rotary shaft 6 and the encoder unit 11 are connected. An electric cylinder characterized in that it is connected to the tip of the rotary shaft 12 by providing some play 15 in the axial direction.