Wheel Hub Freewheel Layout for Backward Rotation Release
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Solution Overview
Problem
Existing wheel hub arrangements require three concentric sleeves with bearings, which increase weight, assembly time, and cost, and are limited to bi-directional drives, preventing backward motion without a freewheel lock mechanism.
Innovation Solution
A wheel hub arrangement with a stationary shaft, a hollow drum, and a driving connection using a first freewheel and a releasing mechanism, featuring an inner sleeve with rock levers and springs, allowing independent backward rotation by disengaging from the wheel drum when reversed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three concentric sleeves with bearings are used to enable backward motion, then backward motion capability is achieved, but weight, assembly time, and cost increase
Solution Approach 1:
The invention extracts and eliminates the intermediate sleeve from the three-sleeve concentric arrangement, reducing the structure to two sleeves (inner and outer). This removal of the unnecessary intermediate component directly reduces weight, assembly complexity, and cost while preserving the backward motion capability through the retained two-sleeve design with appropriate bearing arrangements.
Solution Approach 2:
The invention segments the wheel hub into functional components: a stationary shaft, an inner sleeve with first bearings, an outer sleeve with second bearings, and a releasing mechanism. This segmentation allows each component to perform its specific function efficiently, enabling backward motion through the releasing mechanism while avoiding the need for three concentric sleeves, thus reducing overall weight and complexity.
2Adaptability or versatility
If three concentric sleeves with bearings are used to enable backward motion, then backward motion capability is achieved, but assembly complexity and cost increase
Solution Approach 1:
The invention extracts and eliminates the intermediate sleeve from the three-sleeve concentric arrangement, reducing the structure to two sleeves (inner and outer). This removal of the unnecessary intermediate component directly reduces weight, assembly complexity, and cost while preserving the backward motion capability through the retained two-sleeve design with appropriate bearing arrangements.
Solution Approach 2:
The invention merges the functions of the three-sleeve system into a two-sleeve configuration. The inner sleeve and outer sleeve are designed to work together with a releasing mechanism that enables backward motion, combining multiple functions into fewer components and simplifying the overall assembly process.
3Productivity
If a freewheel is used to prevent backward rotation, then forward drive efficiency is improved, but backward motion is blocked without additional protective mechanisms
Solution Approach 1:
The invention employs a dynamic releasing mechanism that changes the state of the freewheel based on rotation direction. During forward rotation, the freewheel is engaged for efficient power transmission. When backward rotation is detected, the releasing mechanism disengages the freewheel, allowing backward motion. This dynamic state change enables both forward drive efficiency and backward motion capability.
Solution Approach 2:
The invention changes the operational parameters of the freewheel based on rotation direction. Through the releasing mechanism, the freewheel transitions between engaged and disengaged states, altering its mechanical properties to suit different operational requirements: engaged state for forward drive efficiency, disengaged state for backward motion capability.
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
Enables simpler, lighter, and cost-effective wheel hub operation with bi-directional capability, suitable for one-sided drives, reducing assembly complexity and weight, and allowing backward motion without additional freewheel locks.
Implementation Method 1
a first freewheel and a releasing mechanism that comprises a second freewheel
Implementation Method 2
rock levers are arranged biased by springs
Implementation Method 3
rock levers are arranged biased by springs and they are pivotally fixed around pins that bridge the cuts, and one ends of the rock levers are projecting into the interior of the inner sleeve
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
Wheel hub arrangement for a drive with rotated drum comprising: a stationary shaft; a hollow drum (19) arranged by bearings around it, a wheel drum (32) constituting the hub of the driven wheel, and freewheels, inner sleeve which are arranged around the stationary shaft by bearings, and placed at least in part in the cavity of the drum (19) and at the wheel drum (32), and said bearings (23, 24) of the drum (19) and the first freewheel (25) are arranged between the outer mantle of the inner sleeve and the interior of the drum (19, 20), and the interior of the wheel drum (32) comprises a ring arranged in this cylindrical interior and connected in a fixed way thereto or made as a single piece therewith and the ring is guided through bearings around a section of the outer mantle of the inner sleeve, and at least two cuts (38, 39) are provided in a portion of the inner sleeve which is under the ring and preferably at its central section, and a second freewheel (57) is arranged in the interior of the inner sleeve, and in the cuts (38, 39) rock levers (40, 41) are arranged biased by springs and being pivotally fixed around pins (42, 43) bridging said cuts (38, 39), and one ends of the rock levers (40, 41) are projecting into the interior of the inner sleeve and being supported in recesses provided on the outer ring of the second freewheel (57) and the other ends are abutting in one of a plurality of profiled recesses provided in the interior of the ring when the ring and the wheel drum (32) connected to it in a rigid way are rotating in forward direction, and when the wheel drum (32) is turned in backward direction, the rock levers (40, 41) will get disengaged from the profiled recess of the ring by being turned by the recess of the second freewheel (57) that gets locked in that rearward direction, whereby the engagement between the ring and the inner sleeve gets released that allows the free rearward rotation of the wheel drum (32).