Sub-roll Rod Device for Powertrain Forward-Backward Movement Control
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Solution Overview
Problem
The existing three-point supporting method for mounting a powertrain in vehicles results in inadequate control of forward-and-backward movement, leading to excessive vibration and maintenance costs due to bolt loosening and breakage, especially during rapid acceleration and braking.
Innovation Solution
A sub-roll rod device is introduced, which includes a body with through-holes of different diameters, elastic bodies for vibration absorption, and a reinforcing case embedded in the side member, allowing for a three-plus-one supporting method that controls forward-and-backward movement while maintaining Noise, Vibration & Harshness (NVH) performance and improving assembly ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a three-point supporting method is used to mount the powertrain, then vibration control is improved, but forward-and-backward movement control deteriorates
Solution Approach 1:
The powertrain supporting system is segmented into multiple independent supporting points: three main supporting points (engine mount, transmission mount, and roll rod) and additional sub-roll rods. Each supporting point independently handles specific forces, with sub-roll rods specifically dedicated to controlling forward-and-backward movement while main supports handle vibration control.
Solution Approach 2:
The supporting system transitions from a planar three-point support configuration to a three-dimensional multi-point support system. Sub-roll rods are positioned at different spatial locations and orientations to provide comprehensive control over forward-and-backward movement in addition to the original vibration control capabilities.
2Ease of manufacture
If the powertrain is mounted using a three-point supporting method, then assembly is completed, but maintenance costs increase due to bolt loosening and breakage
Solution Approach 1:
Elastic bodies are incorporated into the mounting members to prevent bolt loosening and breakage before they occur. This proactive approach eliminates the need for frequent maintenance and replacement of mounting hardware, reducing maintenance costs while maintaining assembly simplicity.
3Stability of the object's composition
If a sub-roll rod is added to the three-point supporting method, then forward-and-backward movement control is improved, but device complexity increases
Solution Approach 1:
The sub-roll rods are designed to perform multiple functions: controlling forward-and-backward movement, providing additional vibration damping, and reinforcing the side member structure. This multi-functionality reduces the need for separate components for each function, thereby limiting the increase in overall system complexity.
Solution Approach 2:
The sub-roll rod is nested within the side member structure, with the elastic body housed inside the sub-roll rod body. This nested configuration minimizes the space required for the additional component and integrates it seamlessly into the existing powertrain mounting system, reducing the perceived complexity increase.
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
The sub-roll rod device effectively absorbs and removes impact and vibration, maintaining NVH performance and increasing the rigidity of the side member, reducing maintenance costs by eliminating the need for separate reinforcing plates and jigs during powertrain assembly.
Implementation Method 1
a first elastic body interposed between the inner diameter surface of the first through-hole and the outer diameter surface of the engine fastening pipe; and a second elastic body interposed between the inner diameter surface of the second through-hole and the outer diameter surface of the vehicle body fastening pipe
Implementation Method 2
the first elastic body is characterized by being composed of an up-and-down directional elastic body vertically connecting the inner diameter surface of the first through-hole and the outer diameter surface of the engine fastening pipe
Implementation Method 3
a reinforcing case for mounting the sub-roll rod is characterized by being embedding inside the side member through the sub-roll rod mounting hole
Data Source
AI summary
A sub-roll rod device for mounting a powertrain of a vehicle can, in addition to mounting the powertrain in an engine room of the vehicle using a mounting member in a three-point supporting method, mount the sub-roll rod that can be assembled with the powertrain in a side member of a vehicle body, thus controlling forward-and-backward movement of the powertrain while maintaining Noise, Vibration & Harshness (NVH) performance by the three-point supporting method and improving ease of assembly of the powertrain with respect to the engine room.