Compaction Roller Drive Shaft Vibration Segmentation
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Solution Overview
Problem
Existing self-propelled compaction rollers face issues with side overhang and uneven vibration distribution among tires, leading to inefficient compaction and potential damage to road incidental structures.
Innovation Solution
The compaction roller design features four tires arranged in two pairs with synchronized drive shafts and vibration transmission, supported by first and second support brackets to ensure even vibration distribution and reduce side overhang, using hollow-structure motors and vibration sources within the drive shafts to minimize external protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a tire support member is interposed between adjoining tires to reduce side overhang, then the most outside tire can be placed closer to road incidental structure for compaction, but vibrations are hard to be transmitted to the two outside tires and vibration differences occur between the four tires
Solution Approach 1:
The vibration transmission system is segmented into multiple independent paths: each traveling drive shaft is equipped with its own vibration source, and each first support bracket independently transmits vibrations to its corresponding outside and inside tires. This segmentation ensures that even with the tire support member interposed, all four tires receive vibrations through dedicated transmission paths, eliminating vibration differences while maintaining reduced side overhang
Solution Approach 2:
The traveling drive shaft serves as an intermediary mechanism that couples the vibration source to both the outside and inside tires simultaneously. By placing the vibration source within the traveling drive shaft and using the first support bracket as an intermediary support structure, vibrations are efficiently transmitted to all tires including the outside tires, resolving the vibration transmission issue while keeping the tire support member in its optimal position for minimizing side overhang
2Ease of manufacture
If the tire support member is disposed outwardly of the most outside tire to support the traveling motor, then the traveling motor can be properly supported, but the side overhang becomes large and compaction near road incidental structure is impossible
Solution Approach 1:
The traveling motor is nested within the hollow-structure motor, with the traveling drive shaft positioned inside the motor housing. This nesting arrangement eliminates the need for an external tire support member, as the motor's own structure provides the necessary support. Consequently, the side overhang is minimized while the traveling motor remains properly supported, enabling compaction near road incidental structure
3Reliability
If four tires are arranged in two pairs with synchronized drive shafts, then vibrations can be transmitted efficiently to all tires, but the device complexity increases with additional support brackets and vibration proof devices
Solution Approach 1:
The first support bracket is designed as a multi-functional component that simultaneously serves as a support structure for the traveling drive shaft, a vibration transmission path, and a mounting point for the bearing device. The vibration proof device mounted on the vehicle body provides both support and vibration isolation functions. This universal design reduces the number of separate components needed, thereby reducing device complexity while maintaining efficient vibration transmission to all four tires
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
This design allows for efficient vibration transmission to all tires, reduces side overhang, enables differential rotation of tires, and prevents abnormal oscillations, enhancing compaction efficiency and maintenance accessibility.
Implementation Method 1
a vibration device, which generates the vibration when driven by a vibration motor, to the outside and inside tires
Implementation Method 2
supports the corresponding traveling drive shaft through a bearing device
Data Source
Figure 1
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Figure 3
AI summary
A compaction roller comprises a vibration device 3 for generating vibrations when driven by a vibration motor 2; a pair of right and left traveling drive shafts 4, while traveling driving outside tires T1, T4 and their adjoining inside tires T2, T3 synchronously, for transmitting the vibrations of the vibration device 3 to the outside tires T1, T4 and inside tires T2, T3; a pair of right and left traveling motors 5 respectively for driving their associated traveling drive shafts 4; and, a pair of right and left first support brackets 8 mounted through a first vibration proof device 6 on a vehicle body and interposed between the outside tires T1, T4 and inside tires T2, T3 for supporting the traveling drive shafts 4 through bearings 7, wherein the vibration device 3 includes a vibration source disposed within the traveling drive shafts 4. According to the compaction roller, a side overhang can be eliminated or reduced, and enabling prevention of the lowered vibration compacting function of the tires.