Manual Tensioning Device with Slope Guide Slots
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Solution Overview
Problem
Current tensioning devices for automobile hub machining are large, costly, inconvenient to operate, and consume significant energy, making them unsuitable for small-scale machining or repair applications.
Innovation Solution
A manual adjustable tensioning device composed of a handle, lead screw, lead screw nut, force sensors, screws, levers, rollers, springs, and a shell, utilizing a self-locking threaded connection and slope guide slots to allow for manual adjustment of tensioning force with minimal power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If motor-driven or hydraulic-driven tensioning devices are used, then the tensioning force can be automatically controlled, but the device size becomes large, cost increases, and energy consumption rises
Solution Approach 1:
The tensioning device uses a self-locking lead screw mechanism that automatically maintains tensioning force without requiring continuous power input or complex control systems. The threaded connection self-locks at the desired position, eliminating the need for motors, brakes, or hydraulic systems while achieving automatic position holding.
Solution Approach 2:
The invention extracts and eliminates unnecessary complex components (motors, deceleration mechanisms, brakes, hydraulic pumps, valves) from the tensioning system, retaining only the essential lead screw and nut mechanism that provides both actuation and self-locking functions, thereby simplifying the overall device structure.
2Manufacturing precision
If motor-driven tensioning devices are used, then the tensioning force can be precisely controlled, but the device becomes inconvenient to operate and requires large size
Solution Approach 1:
The lead screw mechanism automatically converts rotational motion to linear motion with precise positioning and self-locks at the desired position, eliminating the need for complex control systems while maintaining precision and ease of operation through simple manual rotation.
3Force
If hydraulic-driven tensioning devices are used, then the tensioning force can be adjusted, but the cost increases due to dedicated hydraulic systems
Solution Approach 1:
The invention removes the entire hydraulic system (pumps, valves, hoses, fluid) and replaces it with a simple manual lead screw mechanism that provides force adjustment through rotational input, dramatically reducing manufacturing cost while maintaining force adjustment capability.
Solution Approach 2:
The lead screw mechanism provides self-powered force adjustment through manual rotation, eliminating the need for external hydraulic power sources and control valves, thereby reducing manufacturing cost while maintaining full force adjustment capability.
4Force
If electric or hydraulic driven tensioning mechanisms are used, then the tensioning force can be maintained, but considerable electric energy is consumed
Solution Approach 1:
The self-locking lead screw mechanism maintains tensioning force passively through its mechanical self-locking property, requiring no continuous power input. Once the desired position is reached through manual rotation, the mechanism holds the position and force without consuming additional energy.
Solution Approach 2:
The invention replaces active electric or hydraulic drive systems with a passive mechanical self-locking system, substituting powered force maintenance with mechanical force retention through thread friction and geometry, thereby eliminating continuous energy consumption.
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 device is compact, low-cost, energy-efficient, and easy to operate, providing precise tensioning control suitable for small-scale hub machining and repair, with a broad application prospect due to its simplicity and low environmental impact.
Implementation Method 1
When the handle is rotated, the lead screw rotates, and drives the lead screw nut to move linearly
Implementation Method 2
because the threaded connection has self-locking property, when the handle is rotated to the required position, the lead screw can be self-locked
Implementation Method 3
Slope guide slots are formed in the periphery of the lead screw nut, and the contacts are provided with slopes having the same angles and placed in the guide slots of the lead screw nut. When the lead screw nut moves up and down, the contacts can be driven to expand and retract via the slopes
Implementation Method 4
an extension spring is mounted at the upper part of the slope of the lead screw nut to ensure the slope of the lead screw nut is in contact with the roller all the time
Implementation Method 5
a roller is mounted at the tail end of the lever to prevent too large friction
Data Source
AI summary
Disclosed is a manual adjustable tensioning device. Slope guide slots are formed in the periphery of a lead screw nut, and contacts are provided with slopes having the same angles and placed in the guide slots of the lead screw nut; two ends of a lead screw are respectively supported in threaded holes of a shell and an end cover; screws are connected to the lead screw nut via threaded holes, the tail end of each screw is in contact with one end of a lever, the other end of the lever is in contact with the slope of the lead screw nut, a roller is mounted at the tail end of the lever, and an extension spring is mounted at the end of the slope of the lead screw nut.