Rotation Output Device Lock Mechanism Using Guide Holding Plate
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Solution Overview
Problem
Existing electric tool lock mechanisms fail to automatically lock the output shaft without inertia, leading to reduced operability and requiring manual pivoting, especially at low motor speeds, and adding a planet gear set complicates the mechanism, reducing reliability and increasing size.
Innovation Solution
A rotation output device with a lock mechanism that includes a guide holding plate, movement locking plate, and relative rotation means to automatically lock the output shaft by rotating the guide holding plate after motor stoppage, eliminating the need for inertia and complex planet gear sets, using click springs and arc-shaped grooves for enhanced engagement and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a planet gear set is added to guarantee automatic locking in all directions, then the locking reliability is improved, but the device complexity increases and the mechanism size grows
Solution Approach 1:
The invention extracts and eliminates the complex planet gear set from the lock operating mechanism. Instead, it uses a simple guide holding plate with grooves that guide the locking plate radially outward through the play angle, achieving automatic locking without additional complex mechanisms.
Solution Approach 2:
The invention inverts the conventional approach by using the play angle between input and output shafts as a resource rather than a problem. The guide holding plate utilizes this play angle to automatically move the locking plate into the locked position, converting the existing mechanical characteristic into a functional advantage.
2Reliability
If a planet gear set is added to guarantee automatic locking in all directions, then the locking reliability is improved, but the space required increases reducing compactness
Solution Approach 1:
The invention removes the space-consuming planet gear set and replaces it with a compact guide holding plate structure that achieves the same locking function within a smaller volume, maintaining reliability while improving compactness.
3Ease of operation
If inertia-based automatic locking is used, then the operability is improved, but the locking function fails at low motor speeds where insufficient pivoting occurs
Solution Approach 1:
The guide holding plate is pre-configured with grooves that automatically guide the locking plate into the locked position as soon as the output shaft pivots by the play angle, ensuring reliable locking without depending on the magnitude of inertia or the speed at which the motor stops.
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
The device ensures the output shaft is reliably locked without manual intervention, maintaining operability and reducing the complexity and size of the lock mechanism, enhancing reliability and durability.
Implementation Method 1
the relative rotation means is configured to relatively rotate the guide holding plate upon stoppage of the rotation driving of the rotation input body
Implementation Method 2
a movement locking plate that is held by the guide holding plate, wherein the movement locking plate is configured to be urged radially outward and to fixedly engage the fixing member
Data Source
AI summary
A rotation output device including a lock mechanism for automatically locking an output shaft without inertia or a need to pivot the output shaft by the operator after the input shaft stops rotating. The rotation output device includes an output gear for inputting a rotation driving force; a lock ring restricted from rotating; output rings for rotating integrally with the spindle; a click spring for rotating the output rings with respect to the output gear; float gears which are held by the output ring to be urged radially outward and are fixedly engageable with the lock ring; and central pin insertion through-holes and side pin insertion through-holes provided in the output rings for releasing the float gears radially outward and fixedly engaging the float gears with the lock ring. The click spring relatively rotates the output rings by the stoppage of the rotation driving of the output gear.