Gearcase Oil Storage Layout for Low-Height Power Transmission
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Solution Overview
Problem
Existing power transmission devices for electric vehicles face challenges in reducing their height dimension while maintaining efficient power transmission, as the space required for lubricating oil storage increases the device's height.
Innovation Solution
The power transmission device incorporates a deceleration device and a case with a gear chamber that includes an accommodation chamber for the deceleration device. A lubricating liquid storage portion is arranged above the rotation axis of the input shaft and below the upper end of the deceleration mechanism, overlapping the deceleration mechanism in the axial direction, to optimize lubrication and reduce height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the space for storing lubricating oil is formed above the drive gear in the conventional power transmission device, then the lubrication performance is improved, but the dimension in the height direction is increased
Solution Approach 1:
The storage portion is positioned to overlap with the deceleration mechanism in the axial direction, utilizing the radial space above the input shaft rotation axis. This spatial reconfiguration allows the storage portion to be integrated within the existing height envelope of the power transmission device, thereby improving lubrication performance without increasing the overall height dimension.
Solution Approach 2:
The storage portion is nested within the gear chamber space, specifically utilizing the region above the input shaft rotation axis and below the upper end of the deceleration mechanism. This nesting approach allows the storage function to be embedded within the existing structural boundaries, avoiding additional height increase while maintaining effective lubrication.
2Length of moving object
If the storage portion is positioned to overlap the deceleration mechanism in the axial direction, then the height dimension is reduced, but the space for lubricating liquid is constrained
Solution Approach 1:
The storage portion is specifically positioned in the region above the input shaft rotation axis and below the upper end of the deceleration mechanism, utilizing the local space that would otherwise be unused. This localized placement optimizes the use of available volume within the height constraints, ensuring sufficient lubricating liquid capacity without compromising the reduced height dimension.
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 configuration allows for a reduction in the height dimension of the power transmission device without compromising power transmission efficiency, as the lubricating liquid storage is optimized to minimize agitation resistance and maintain effective lubrication.
Implementation Method 1
a first storage portion configured to store a lubricating liquid for lubricating the deceleration device
Implementation Method 2
a second storage portion configured to store a lubricating liquid for lubricating the differential gear mechanism
Data Source
AI summary
A power transmission device includes: a deceleration device; and a case including a gear chamber provided with an accommodation chamber that accommodates the deceleration device therein, in which the deceleration device includes an input shaft whose rotation axis direction extends in a horizontal direction, and a deceleration mechanism configured to reduce power input from the input shaft, and a wall portion of the case is provided with a first storage portion configured to store a lubricating liquid for lubricating the deceleration device, the first storage portion being arranged above a rotation axis of the input shaft and below an upper end of the deceleration mechanism in an upper-lower direction, and arranged at a position where at least a part thereof overlaps the deceleration mechanism in an axial direction of the input shaft.