Spindle Lock Driver with Prismatic Profile for Torque Shock Management
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Solution Overview
Problem
Machine tools, particularly hand-held electric tools, face challenges in managing high torque applications and torque shocks, as existing spindle lock drivers often transmit excessive torque through sensitive gear parts, leading to reduced precision and service life.
Innovation Solution
A prismatic driving profile with axially parallel planes, where one part acts as clamping surfaces and the other as driving surfaces, supports drivers symmetrically, allowing for direct engagement with the spindle and reducing surface pressures, thereby preventing torque shocks from being transmitted through sensitive gear parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spindle lock driver transmits torque through the gear unit, then the spindle can be locked, but excessive torque is transmitted through sensitive gear parts reducing precision and service life
Solution Approach 1:
The spindle lock driver is extracted from the gear train path. Instead of transmitting torque through the pinion and countershaft gear wheel, the driver engages directly with the spindle, removing the gear components from the torque transmission path and eliminating the harmful effect of torque shocks on sensitive gear parts.
Solution Approach 2:
The prismatic driving profile acts as an intermediary element between the spindle lock driver and the spindle. This mediator allows direct engagement and torque transmission while providing a controlled interface that prevents excessive surface pressures and protects both the driver and spindle from torque shock damage.
2Power
If conventional spindle lock drivers are used, then torque can be transferred, but surface pressures become excessive reducing precision
Solution Approach 1:
The driving profile is segmented into distinct functional zones: driving surfaces for torque transmission and clamping surfaces for securing the driver. This segmentation allows each surface to be optimized for its specific function, with driving surfaces designed to transfer torque while maintaining controlled surface pressures, and clamping surfaces designed to secure the driver without excessive pressure.
Solution Approach 2:
Different surfaces of the driving profile have different local qualities and functions. The driving surfaces are optimized for torque transmission with appropriate friction characteristics, while the clamping surfaces are optimized for securing the driver. This local differentiation allows precise control of surface pressures in each zone, maintaining manufacturing precision while enabling effective torque transfer.
3Strength
If direct engagement with spindle is implemented, then high torques can be managed, but the structure becomes more complex
Solution Approach 1:
The prismatic driving profile serves multiple functions simultaneously: it provides driving surfaces for torque transmission, clamping surfaces for securing the driver, and guided edges for reliable positioning. This multi-functionality allows direct engagement with the spindle to handle high torques while avoiding the need for separate components for each function, thereby limiting the increase in structural complexity.
Data Source
AI summary
Disclosed is a machine tool having a spindle driven by a drive device, the spindle having a receiving device on its free end for a tool or a tool holder, an input part being provided in the drive train of the drive device, the input part transferring a torque having a defined play in the direction of rotation via drivers to an output part which is joined in a rotationally fixed manner to the spindle, while a torque acting from the spindle in the direction of the drive device and exceeding a torque on the input side is supported on the housing of the machine tool via clamping surfaces on the periphery of the output part, via clamping elements and via a locking ring having a hollow cylindrical surface. The output part is a driving profile having two or more axially parallel planes, of which a first part acts as clamping surfaces and a second part acts as driving surfaces which cooperate with the drivers of the input part.