Balancer Device Axial Dimension Reduction via Opposite Shaft Arrangement
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Solution Overview
Problem
Conventional balancer devices for internal combustion engines have a large axial dimension due to the arrangement of the drive mechanism and oil pump on the driven balancer shaft, which is inefficient in terms of space utilization and increases the device's size.
Innovation Solution
The drive mechanism and oil pump are positioned on the side opposite to the driven balancer weight in the axial direction of the driven balancer shaft, effectively utilizing previously unused space to reduce the axial dimension and shorten the torque transmission path, thereby reducing the overall size and noise of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the drive mechanism and oil pump are arranged on the driven balancer shaft, then the torque transmission path is established, but the axial dimension of the device increases
Solution Approach 1:
The patent applies dimensionality change by moving the drive mechanism and oil pump from the axial direction to the radial direction of the driven balancer shaft. Specifically, the drive mechanism is arranged on the radial outer side of the driven balancer shaft, and the oil pump is positioned on the radial inner side, allowing torque transmission without increasing axial dimension.
Solution Approach 2:
The patent implements nesting by placing the oil pump inside the driven balancer shaft structure. The oil pump is positioned on the radial inner side of the driven balancer shaft, utilizing the internal space of the shaft structure, while the drive mechanism is arranged on the radial outer side, creating a compact nested arrangement.
2Power
If the drive mechanism and oil pump are arranged on the driven balancer shaft, then the torque transmission function is achieved, but the device size increases
Solution Approach 1:
The patent merges the drive mechanism and oil pump into a single integrated assembly on the driven balancer shaft. Both components are positioned on the same shaft structure, with the drive mechanism on the radial outer side and the oil pump on the radial inner side, allowing torque transmission while minimizing overall device volume.
3Power
If the drive mechanism and oil pump are arranged on the driven balancer shaft, then the torque transmission path is established, but noise increases
Solution Approach 1:
The patent introduces an intermediary gear mechanism between the driven balancer shaft and the oil pump. The drive mechanism includes a drive gear engaged with the driven balancer shaft and a driven gear that drives the oil pump, creating a buffered torque transmission path that reduces noise compared to direct coupling.
Data Source
AI summary
A balancer device for an internal combustion engine is provided, wherein the drive mechanism 8 and the oil pump 3 are arranged on the side opposite to driven balancer weight 135 in the axial direction of the driven balancer shaft 5.