Extendable Ball Screw Structure for High-Speed Stroke Motion
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Solution Overview
Problem
Conventional extendable devices that extend and contract in height or horizontal directions face reduced rotational speeds and movement speeds due to the motor's weight being applied as a load, hindering high-speed operations.
Innovation Solution
The extendable device design separates the motor from the movable members, using a system of ball screws and a transmission mechanism to transmit rotation, allowing the movable members to move without the motor's weight as a load, enabling high-speed extension and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the motor is attached to the movable support column, then the drive source is integrated with the moving structure, but the motor's weight reduces rotational speed and movement speed
Solution Approach 1:
The motor is extracted from the movable support column and relocated to a fixed position on the base. This separation removes the motor's weight from the moving mass, eliminating the speed reduction effect while maintaining the drive function through the ball screw transmission mechanism.
2Power
If the motor weight is applied as load, then the motor provides driving force, but the load reduces rotational speeds of ball screws
Solution Approach 1:
The system is segmented into a fixed drive section (motor on base) and a moving execution section (movable support columns). The motor remains stationary to provide power, while the ball screws and movable columns handle the motion, separating the power generation function from the motion execution function to eliminate speed penalties.
3Volume of moving object
If the motor is attached to the movable member, then the structure is compact, but the movement speed is reduced
Solution Approach 1:
The ball screw acts as an intermediary transmission mechanism between the stationary motor and the movable support column. It transmits rotational motion and force from the fixed motor to the moving column, enabling speed amplification while the motor remains stationary, thus achieving high speed without requiring the motor to be mounted on the moving part.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design suppresses reductions in rotational and movement speeds, enabling high-speed operations and reducing the burden on power supply cables, while allowing the motor to be placed outside vacuum environments, and enabling larger stroke lengths.
Implementation Method 1
a first ball screw that is provided to the base member and that rotates according to a driving force supplied from a drive source; a first movable member that is coupled to the base member via the first ball screw and that moves relative to the base member as the first ball screw rotates
Data Source
AI summary
This extendable device includes: a base member; a first ball screw that is provided to the base member and that rotates according to a driving force supplied from a drive source; a first movable member that is coupled to the base member via the first ball screw and that moves relative to the base member as the first ball screw rotates; a second ball screw that is provided to the first movable member and that rotates as the first movable member moves; a third ball screw that is provided to the first movable member; a transmission mechanism that transmits the rotation of the second ball screw to the third ball screw; and a second movable member that is coupled to the first movable member via the third ball screw and that moves relative to the first movable member as the third ball screw rotates.