Cartridge Actuator Spindle Locking for Consistent Lubricant Dosing
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Solution Overview
Problem
Existing actuating devices for viscous medium cartridges face issues with reliability due to the drive spindle's tendency to rotate under varying loads, leading to inconsistent lubricant dispensing and potential damage when cartridges are connected or disconnected.
Innovation Solution
A device with a drive spindle that incorporates a first and second rotation-preventing element, allowing for non-rotatable engagement with the housing, and a torque-limiting mechanism to prevent spindle rotation under high loads, ensuring reliable lubricant dispensing and protection against damage during cartridge attachment or detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drive spindle is allowed to rotate freely to enable cartridge connection/disconnection, then the ease of operation is improved, but the reliability of lubricant dispensing deteriorates due to inconsistent dosing under varying loads
Solution Approach 1:
The drive spindle is designed with dynamic rotational characteristics that adapt to different operational phases: during cartridge connection/disconnection, the spindle can rotate freely with minimal resistance, while during lubricant dispensing, the spindle rotation is controlled and regulated to ensure consistent dosing. This dynamic behavior resolves the contradiction between ease of operation and dosing reliability.
2Power
If the drive spindle operates under high torque loads during lubricant dispensing, then the power transmission is improved, but the reliability deteriorates due to spindle rotation causing inconsistent positioning and dosing
Solution Approach 1:
The friction characteristics between the drive spindle and housing are carefully controlled to change based on operational conditions. Under high torque loads during lubricant dispensing, increased friction prevents unwanted spindle rotation and maintains positioning consistency, while still allowing sufficient power transmission. This parameter control resolves the contradiction between power transmission and positioning reliability.
3Reliability
If the drive spindle is prevented from rotating during operation to ensure consistent dosing, then the reliability is improved, but the ease of operation deteriorates when connecting or disconnecting cartridges
Solution Approach 1:
The drive spindle exhibits periodic behavioral changes based on operational phase: during cartridge connection/disconnection, the spindle is allowed to rotate freely; during lubricant dispensing, the spindle rotation is controlled to prevent inconsistency. This periodic switching between different rotational states resolves the contradiction between reliability during operation and ease of operation during maintenance.
Data Source
AI summary
An actuating device for a cartridge including a housing in which a linearly acting drive is arranged including a drive motor and transmission including a drive spindle and spindle nut, the drive motor is engaged with the spindle nut for transmitting rotational movement, the drive spindle reciprocates over a stroke upon rotation of the spindle nut relative to the housing, the housing includes a wall through which the drive spindle can be passed with a first axial end, the drive spindle can be brought into direct or indirect engagement with a displacement element of the cartridge at the first axial end, the drive spindle includes a first rotation-preventing element along a section in the housing, a second rotation-preventing element associated with the housing is provided, and the drive spindle is supported non-rotatable against the housing over at least part of the stroke. A combination of a device and a cartridge.