Working Machine Clutch Pawl Locking Mechanism
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Solution Overview
Problem
Existing working devices with internal combustion engines lack a simple and effective mechanism to prevent the tool from starting up when intended, potentially leading to unintended operation.
Innovation Solution
A blocking device with a pawl is implemented, which is actuated to limit the rotation of the driven element to less than one revolution, ensuring the tool does not start when the starting device is engaged. The pawl is spring-loaded to return to its unactuated position and can be reset independently of the starting device, allowing for a simple and structurally efficient design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking device with a pawl is implemented to prevent tool startup, then safety against unintended operation is improved, but device complexity increases
Solution Approach 1:
The blocking device with pawl is integrated into the existing starting device mechanism. The pawl is positioned within the starting device housing and interacts with the driven element through the clutch assembly, nesting the safety function within the existing structural framework rather than adding a completely separate system.
Solution Approach 2:
The spring-loaded pawl automatically engages with the driven element when the starting device is in the starting position, and automatically disengages when the starting device is actuated. The spring provides continuous pressure to maintain engagement, and the mechanism self-regulates without requiring external control systems or additional actuators.
2Ease of operation
If the pawl is spring-loaded to return to unactuated position, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The spring automatically returns the pawl to its unactuated position after the starting device is actuated, eliminating the need for manual resetting by the operator. The spring is pre-loaded and continuously exerts force on the pawl, ensuring it returns to the engaged position whenever the starting device returns to its normal state, providing automatic reset functionality.
Solution Approach 2:
The spring-loaded mechanism creates a periodic engagement-disengagement cycle that corresponds to the starting device operation. Each time the starting device is actuated, the pawl is pushed away from the driven element; each time the starting device returns to normal position, the spring pushes the pawl back into engagement, creating a reliable periodic safety cycle.
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 solution effectively prevents the tool from starting by securely locking the driven element, absorbing significant forces, and allows for easy resetting, ensuring the tool remains stationary during the starting process, thus preventing unintended operation.
Implementation Method 1
The pawl is advantageously spring-loaded by a return spring in the direction of the non-actuated position of the blocking device
Implementation Method 2
A damping spring is advantageously arranged in an operative connection between the actuating device and the pawl
Data Source
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AI summary
A working device has an internal combustion engine (11) which drives at least one tool of the working device via a clutch (13). The clutch (13) has at least one drive element (63) operatively connected to the combustion engine (11) and at least one output element (51) operatively connected to the tool. The working device has a starting device (39) with a starting position (42) and an operating position (35). To prevent unintentional rotation of the output element (51) during starting, the working device has a locking device (43) with a pawl (44) which, in an actuated position (46), projects into the path of movement of the output element (51) and limits the rotation of the output element (51) to less than one revolution, and which, in an unactuated position (47), releases the output element (51).The starting device (39) has an actuating device (45) for the blocking device (43), which holds the pawl (44) in the start position (42) of the starting device (39) in the actuated position (46).