Electrically-driven cylinder
The compact air cylinder design integrates an expandable mechanism inside the hollow rotary shaft, allowing for precise position control and pushing motion, addressing the size and control limitations of traditional air cylinders.
Patent Information
- Application Number
- JP2023161751
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-09-07
- Publication Date
- 2025-03-19
AI Technical Summary
Existing air cylinders are large and heavy, and they lack the ability to be controlled in size and position using a magnetic sensor, limiting their versatility in applications requiring precise control and compact size.
A compact air cylinder design where the cylinder is used as a stator with an integrated expandable mechanism inside the hollow rotary shaft, connected via a ball screw structure and elastic mechanisms, allowing for inverse rotation and precise position control using a magnetic sensor.
The design achieves a size equivalent to a standard air cylinder while enabling precise position control and pushing motion, making it suitable for applications where air cylinders are typically used.
Smart Images
Figure 2025038838000001_ABST
Abstract
Description
[Technical field]
[0001] It has a cylinder as a stator and a hollow rotating shaft, with a telescopic shaft housed inside the hollow rotating shaft and a drive shaft housed inside the telescopic shaft. The hollow rotating shaft is connected to the input shaft of the hollow reversing reducer located at the rear, and the output shaft is linked to the drive shaft by an elastic mechanism consisting of a spring and air damper. The drive shaft and telescopic shaft are connected by a ball screw structure. As the hollow rotating shaft and drive shaft rotate in opposite directions, the telescopic shaft expands and contracts due to internal and external reaction forces. The extension and retraction position is controlled by a magnetic sensor, and the piston has a magnetic material for the magnetic sensor. The piston moves with a screw structure on the outer periphery of the hollow rotating shaft. This gives it the same physical size as an air cylinder, allows position control with a magnetic sensor, and can be pushed off like an air cylinder with an elastic mechanism, making it possible to replace an air cylinder. Technical background
[0002] By using the cylinder as the motor's stator and consolidating the expansion and contraction mechanism inside the motor's hollow rotating shaft, it is possible to make the motor smaller and lighter, and to replace air cylinders. By rotating the hollow rotating shaft and the drive shaft in opposite directions, the telescopic shaft with a ball screw structure can be moved back and forth. The reducer and drive shaft are connected with an elastic mechanism consisting of a spring and air damper, allowing for a pushing and cutting operation. Summary of the Invention Problems that the invention aims to solve
[0003] By making the cylinder the stator and the motor shaft a hollow structure, and consolidating the expansion and contraction mechanism inside the shaft, we have achieved the same size as an air cylinder, and by connecting the reducer and drive shaft with an elastic mechanism consisting of a spring and air damper, we have achieved a size that is physically the same as an air cylinder, and it can be used in the same way as an air cylinder, with position control by a magnetic sensor and push-off operation.
[0004] The cylinder part is the stator, the telescopic shaft is stored inside the hollow rotating shaft, the drive shaft is stored inside the telescopic shaft, the telescopic shaft and the drive shaft have a ball screw structure, the hollow rotating shaft and the counter-rotating reducer are connected at the rear, the reducer output and the drive shaft are connected with an elastic mechanism consisting of a spring and an air damper, and a piston with a magnetic body is placed on the outer periphery of the hollow rotating shaft, making it possible to use a positioning sensor placed on the outer periphery of the cylinder.
[0005] The cylinder part is made smaller by consolidating the expansion and contraction mechanism inside the hollow rotating shaft, and the elastic mechanism using a spring and air damper allows for the same pushing action as an air cylinder. Position control is possible with a magnetic sensor, so it can be used in the same way as an air cylinder. [Brief description of the drawings]
[0006] [Figure 1] 1 is a configuration diagram showing a first embodiment of the invention related to this application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0007] A stator (2) is assembled into a cylinder (1), and a hollow rotating shaft (4) is attached to a rotor (3) and fixed to front and rear bearings (5). The hollow rotating shaft (4) is connected to the rear reverse rotation reducer (6), and the output shaft of the reverse rotation reducer (6) is connected to the drive shaft (9) via an elastic mechanism (7) consisting of a spring and an air damper. A telescopic shaft (8) having a ball nut (10) is attached to the drive shaft (9). A thread (11) is arranged on the hollow rotating shaft (4), a piston (13) having a magnetic body (12) arranged thereon is attached, and a positioning sensor (14) is attached to the outer periphery of the cylinder. By connecting the sensor (14) to the drive board (15) and connecting the control device (16) and forward / reverse command, forward sensor, and reverse sensor output to the drive board (15), it can be used in the same way as an air cylinder. [Explanation of symbols]
[0008] 1 cylinder 2 Stator 3 Rotor 4 Hollow Rotating Shaft 5 Bearings 6 Reducer 7 Elastic mechanism 8 Telescopic axis 9 Drive shaft 10 Ball nut 11. Moving Gear 12 Magnetic material 13 Piston 14 Magnetic Position Sensor 15 Drive Board 16 External control devices
Claims
1. An electric cylinder with the drive motor inside the cylinder body.
2. An electric cylinder with a hollow rotating shaft, an extendable shaft, and a drive shaft.
3. An electric cylinder that extends and retracts the telescopic shaft by rotating the hollow rotating shaft and the drive shaft in opposite directions.
4. An electric cylinder in which a hollow rotating shaft and a drive shaft are connected with a spring and an air damper.
5. An electric cylinder with a hollow rotating shaft and a reducer that rotates the drive shaft in opposite directions.
6. An electric cylinder having a sensor piston with a magnetic body arranged therein to operate a magnetic sensor.