Solenoid Cooling and Feed Pawl Actuation in Driving Tools
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Solution Overview
Problem
Existing driving tools face challenges in efficiently cooling the solenoid, which is crucial for maintaining the solenoid's output and preventing overheating.
Innovation Solution
The solenoid is arranged within the main body housing, allowing it to be cooled by the same airflow used for the electric motor, and a power transmission member is used to efficiently transmit the solenoid's output to the feed pawl, optimizing the solenoid's stroke length and maintaining high output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the solenoid is arranged outside the main body housing, then the solenoid can be positioned near the magazine for direct actuation, but the solenoid cannot be effectively cooled by the fan-generated airflow
Solution Approach 1:
The solenoid is moved from the external magazine area into the main body housing, merging its location with the internal cooling airflow path. This allows the solenoid to be simultaneously positioned for effective cooling by the fan while maintaining its actuation function through the power transmission member mechanism.
Solution Approach 2:
A power transmission member is introduced as an intermediary between the solenoid and the feed pawl. This allows the solenoid to be positioned inside the housing for cooling while still effectively actuating the feed pawl through the transmission mechanism, resolving the conflict between cooling access and direct actuation positioning.
2Length of moving object
If the plunger stroke length is increased to move the feed pawl further, then the feed pawl can reach the driving passage, but the solenoid output decreases due to reduced insertion length into the coil
Solution Approach 1:
The power transmission member acts as a mechanical intermediary that converts the solenoid's limited linear stroke into the feed pawl's required movement distance. This allows the solenoid plunger to maintain a short insertion length for high output while still achieving the necessary feed pawl displacement through the transmission mechanism.
Solution Approach 2:
The system changes the operational parameters by using a short-stroke solenoid coupled with a power transmission mechanism rather than a long-stroke solenoid. This parameter change optimizes the solenoid's electrical-to-mechanical conversion efficiency while achieving the required feed pawl movement through mechanical advantage in the transmission system.
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 configuration enables efficient cooling of the solenoid, suppressing temperature rises and maintaining high solenoid output, while also ensuring reliable and efficient feeding of driving members.
Implementation Method 1
a solenoid configured to move the feed pawl via the power transmission member
Implementation Method 2
the solenoid can be arranged on a flow passage of a cooling air for cooling off, for example, the electric motor. Accordingly, the solenoid can be efficiently cooled off, thereby suppressing a temperature rise of the solenoid
Data Source
AI summary
A driving tool includes a driver driven by an electric motor, a driver guide for guiding a movement of the driver, and a magazine for housing driving members. The driving tool also includes a feed pawl for loading the driving members from the magazine to the driver guide, and a power transmission member being interlocking with a movement of the feed pawl. The driving tool also includes a solenoid for moving the feed pawl via the power transmission member. The solenoid is arranged in a main body housing outside of the magazine.