Spindle Locking Assembly Torque Management
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Solution Overview
Problem
Electric work machines, such as driver drills, experience damage to their planetary gear and spindle locking assemblies due to increased torque during screwing operations, leading to potential mechanical failure.
Innovation Solution
The design incorporates a spindle locking assembly with a lock cam and lock ring, along with cylindrical members between them, which allows for one-way rotational force transmission from the carrier to the spindle, reducing stress concentration and preventing reverse rotation, thus minimizing damage under greater loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If greater torque is applied to the spindle in screwing operations, then the screwing capability is improved, but the planetary gear assembly or spindle locking assembly may be damaged
Solution Approach 1:
The patent introduces a damping element between the carrier and the spindle locking assembly that absorbs and dissipates excessive torque before it reaches the planetary gear assembly and spindle locking assembly. This cushioning mechanism prevents damage by converting harmful kinetic energy into heat through controlled deformation, allowing the system to withstand higher torque loads during screwing operations without compromising component integrity
2Ease of operation
If a spindle locking assembly is used to transmit rotational force, then one-way rotation control is achieved, but stress concentration occurs under greater load
Solution Approach 1:
The patent introduces a damping element as an intermediary component between the carrier and the spindle locking assembly. This mediator absorbs and distributes the stress that would otherwise concentrate on the locking assembly during high-torque operations. The damping element acts as a buffer that maintains the one-way rotation control function while preventing stress concentration by distributing mechanical loads more evenly across the assembly
Data Source
AI summary
An electric work machine reduces damage to its components under a greater load on a spindle. An electric work machine includes a motor, a planetary gear assembly rotatable with a rotational force from the motor and including a carrier having a hole having an inner surface including two carrier flat surfaces, a spindle including a rear portion received in the hole and having an outer surface including two spindle flat surfaces, and a spindle locking assembly that transmits a rotational force in one direction from the carrier to the spindle and including a lock cam surrounding the spindle frontward from a front surface of the carrier and rotatable together with the spindle, a lock ring surrounding the lock cam, and a plurality of cylindrical members between the lock cam and the lock ring.