Forklift Reach Mechanism With Gap-Compensating Mast Coupling
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Solution Overview
Problem
Existing forklifts face misalignment issues in their reach mechanisms due to warping and inclination of the mast under load, which increases the vehicle's overall length and obstructs the facing relationship between the rack and pinion, necessitating additional dead space.
Innovation Solution
A forklift design featuring a coupling portion with a protrusion on the mast and an accommodating portion on the advance/retract drive unit, allowing for a flexible mechanism with a gap to absorb misalignment, combined with a horizontally arranged pinion and guide rollers to maintain alignment, reducing the overall length and preventing misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cylinder is arranged behind the mast to move the mast and fork in the front-back direction, then the reach mechanism can achieve advance/retract drive, but the entire length of the vehicle body increases due to the dead space required for the cylinder
Solution Approach 1:
The invention extracts the cylinder from the traditional position behind the mast and relocates it to the straddle leg. This extraction from the critical path allows the mast to move forward without requiring dead space behind it, thereby shortening the vehicle body length while maintaining the advance/retract drive capability through the coupled straddle leg motion.
Solution Approach 2:
The straddle leg is given a dual function: it serves as both a structural support component and as the mounting base for the cylinder that provides advance/retract drive. This multi-functionality eliminates the need for separate dedicated spaces for the cylinder, integrating the drive mechanism into the existing straddle leg structure and reducing overall vehicle length.
2Stability of the object's composition
If the mast is made rigid to maintain alignment, then structural stability is improved, but misalignment occurs due to warping and inclination under load
Solution Approach 1:
The invention introduces dynamic adjustment capability through the coupling between the straddle leg and mast. The allowability of relative movement in specific directions enables the system to dynamically adapt to load-induced deformations, maintaining alignment precision while preserving the mast's structural rigidity and stability.
Solution Approach 2:
The invention changes the operational parameters of the mast-straddle leg connection by allowing controlled relative movement. This parameter change from fixed to movable connection enables the system to compensate for warping and inclination under load, maintaining reach mechanism alignment while preserving mast structural integrity.
3Length of stationary object
If the rack and pinion are positioned closely to save space, then vehicle length is reduced, but misalignment obstructs the facing relationship between the rack and pinion
Solution Approach 1:
The invention introduces the straddle leg-cylinder coupling mechanism as an intermediary that mediates between the mast and the reach mechanism. This intermediary allows for compensation of misalignment through controlled relative movement, enabling the rack and pinion to maintain proper facing relationship even in a compact configuration with reduced vehicle length.
Data Source
AI summary
A forklift includes a vehicle including a pair of straddle legs extending forward from a lower part of a vehicle body and provided at an interval in a vehicle width direction, a cargo handling device including a mast provided between the pair of straddle legs and extending in an up-down direction, a lift bracket provided at the mast such that the lift bracket is capable of being raised and lowered, and a pair of forks extending forward from the lift bracket, a reach mechanism including an advance/retract drive unit capable of performing advance/retract drive in a front-back direction on each of the pair of straddle legs, and a coupling portion coupling the mast and the advance/retract drive unit, in which the coupling portion includes a protrusion provided at one of the advance/retract drive unit and the mast and extending in the up-down direction toward the other of the advance/retract drive unit and the mast, and an accommodating portion provided at the other of the advance/retract drive unit and the mast and including an accommodating hole into which the protrusion is inserted from the up-down direction with a gap.