Power Torque Wrench Gearbox Layout for Lower Reaction Force
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Solution Overview
Problem
Existing torque wrenches require significant manual effort to support high reaction forces during bolting operations due to the rotatable connection between the hand-guided housing and the planetary gearbox, limiting operator comfort and the ability to handle higher torques.
Innovation Solution
A torque wrench design where the drive motor is non-rotatably arranged in the housing, with a rotatably mounted intermediate gearbox connected non-rotatably to a ring gear of a planetary gearbox, allowing the torque support foot to assist in supporting reaction forces, reducing the effort required from the operator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the intermediate gearbox is fixed non-rotatably in the housing, then the housing structure is simple, but the operator must support all reaction forces manually causing high operator effort
Solution Approach 1:
The patent segments the reaction force support function by introducing a torque support foot that can be detached and positioned independently. This allows the housing structure to remain simple while the operator effort is reduced through the distributed support mechanism.
Solution Approach 2:
The torque support foot acts as an intermediary element between the housing and the support surface. It transfers reaction forces from the intermediate gearbox to the external support point, reducing the burden on the operator's hands while maintaining a simple housing structure.
2Strength
If the torque support foot is integrated into the housing, then the support structure is robust, but the device cannot be disassembled for maintenance
Solution Approach 1:
The torque support foot is extracted from the housing as a separate, detachable component. This maintains the robust support structure when needed while allowing the device to be disassembled for maintenance by removing the torque support foot and other components.
Solution Approach 2:
The torque support foot transitions from a static integrated component to a dynamic detachable component. It can be attached when robust support is needed and detached when disassembly for maintenance is required, providing flexibility in the device's structural configuration.
3Stability of the object's composition
If the drive motor and intermediate gearbox are held fixed in the housing, then the housing serves as a stable mounting structure, but the operator must manually support high reaction forces during operation
Solution Approach 1:
The torque support foot serves as an intermediary that transfers reaction forces from the intermediate gearbox to an external support point. This maintains the housing's stability as a mounting structure while significantly reducing the reaction forces that the operator must manually support during operation.
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
The design significantly reduces operator effort and enables handling of higher torques by distributing reaction forces effectively, enhancing comfort and enabling larger torque applications without straining the operator.
Implementation Method 1
a bolting gearbox downstream of the intermediate gearbox with a bolting tool part on the output side, the bolting gearbox reducing the output speed of the intermediate gearbox with a predetermined reduction ratio, preferably at a correspondingly increased bolting gearbox output torque
Implementation Method 2
an intermediate gearbox is provided downstream of the drive motor, which reduces the output speed of the drive motor with a predetermined reduction ratio, preferably at a correspondingly increased intermediate gearbox output torque
Implementation Method 3
the ring gear being rotatably mounted on the housing and having a radially projecting torque support foot which, during a bolting operation, pivots against a required fixed support point and supports there the reaction forces occurring on the planetary gearbox
Data Source
AI summary
A torque wrench such as a power wrench has a drive motor with an intermediate gearbox connected downstream of the drive motor and with a bolting gearbox connected downstream of the intermediate gearbox as a planetary gearbox with a bolting tool part on the output side, and with a housing with at least one handle in which the drive motor and the intermediate gearbox are arranged in sequence. The drive motor is non-rotatably arranged and fixed in the housing, and the intermediate gearbox is rotatably mounted in the housing and is non-rotatably connected to a ring gear of the planetary gearbox, so that, during a bolting operation, only the reaction forces occurring on the housing as a result of the drive motor have to be supported by an operator, and the reaction forces occurring as a result of the intermediate gearbox are supported by the torque support foot.