Work Vehicle Hydraulic Stepless Speed Changing Device Layout
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Solution Overview
Problem
In grass mowers, interference between cable harnesses and hydraulic hoses during assembly and maintenance is a challenge due to their close proximity, leading to entanglement and difficulty in balancing the engine, fuel tank, and hydraulic stepless speed changing devices.
Innovation Solution
A work vehicle design with a bridge beam separating the hydraulic passage from the cable harness, along with the engine and battery positioned side by side to improve balance, and the hydraulic stepless speed changing device oil tank and oil supply cylinder placed at opposite regions to prevent confusion and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the engine and hydraulic stepless speed changing device are disposed close to the driver's seat to improve front-rear balance, then the vehicle body balance is improved, but interference between cable harness and hydraulic hose occurs
Solution Approach 1:
The vehicle body space is segmented into distinct regions: the engine and battery are disposed side by side in the rear portion, while the hydraulic stepless speed changing device and oil tank are positioned in the front portion. This spatial segmentation prevents interference between cable harnesses and hydraulic hoses while maintaining proper vehicle balance.
Solution Approach 2:
The problem is resolved by transitioning from a front-rear arrangement to a transverse arrangement. The engine and battery are disposed side by side in the transverse direction, and the hydraulic components are positioned in the front portion, utilizing the transverse dimension to separate interfering elements.
2Adaptability or versatility
If various electric operating tools, sensors, and cable harnesses are disposed in the periphery of the driver's seat, then the operational functionality is improved, but assembly and maintenance become difficult due to entanglement with hydraulic hoses
Solution Approach 1:
The vehicle body is divided into functional zones: the driver's seat periphery accommodates electric operating tools and sensors, while the front portion houses the hydraulic stepless speed changing device and oil tank. This zonal segmentation eliminates entanglement between cable harnesses and hydraulic hoses, facilitating assembly and maintenance while preserving operational functionality.
3Stability of the object's composition
If the fuel tank, engine, and hydraulic stepless speed changing device are arranged downwardly or rearwardly of the driver's seat, then the balance is improved, but interference between hydraulic passages and cable harnesses occurs
Solution Approach 1:
The hydraulic passage is routed to extend from one side to the other side of the frame unit in the transverse direction, connecting the oil tank to the hydraulic stepless speed changing device. This transverse routing, combined with disposing the engine and battery side by side in the rear, prevents interference with cable harnesses while maintaining vehicle balance.
Data Source
AI summary
A work vehicle includes a driver's seat supported to a frame unit, a first hydraulic stepless speed changing device transmitting power to a first drive wheel, a second hydraulic stepless speed changing device transmitting power to a second drive wheel, and an oil tank. A bridge beam extending in a vehicle body transverse direction is provided between a cable harness extending in the vehicle body transverse direction and a hydraulic passage connecting the second hydraulic stepless speed changing device to the oil tank.