Engine Mount Pin Holes Suppress Slippage
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Solution Overview
Problem
The existing engine mount mounting structures on vehicle frames experience slippage and bolt loosening due to horizontal tightening, leading to inadequate vibration suppression and noise issues, as the clearance between bolt holes and bolts allows relative displacement under road surface inputs.
Innovation Solution
Incorporating displacement suppressing pins through pin holes in the vehicle frame and engine mount, and optionally using spacers between bolt heads and nuts to absorb slippage and prevent torque-induced loosening, ensuring secure fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If bolts are tightened horizontally to mount the engine mount on the vehicle frame, then the mounting structure is simple and easy to implement, but slippage occurs easily between the vehicle frame and the bracket due to road surface inputs, causing bolt loosening
Solution Approach 1:
A displacement suppressing pin is introduced as an intermediary component between the vehicle frame and the engine mount bracket. The pin fits into pin holes formed in both the vehicle frame and the bracket, physically preventing relative displacement in the horizontal direction. This mediator component resolves the contradiction by maintaining simple horizontal bolt tightening while eliminating slippage that causes bolt loosening.
2Ease of operation
If bolt holes are formed with diameter slightly larger than bolt diameter to allow insertion with allowance, then the bolt installation is easy and adaptable, but clearance is formed between the bolt and bolt holes, allowing relative displacement and slippage under load
Solution Approach 1:
The fastening function is segmented into two independent components: bolts for vertical clamping force and a displacement suppressing pin for horizontal position control. The pin holes are formed with a diameter that allows easy insertion of the pin while preventing horizontal displacement. This segmentation resolves the contradiction by separating the installation ease function (achieved through allowable clearance in bolt holes) from the stability function (achieved through the pin with controlled clearance).
3Strength
If multiple bolts are used to improve supporting rigidity for the engine, then the engine support stability is improved, but the complexity of the mounting structure increases
Solution Approach 1:
The displacement suppressing pin combines multiple functions into a single component: it prevents horizontal slippage, maintains bolt alignment, and works synergistically with the bolt assembly to provide both vertical and horizontal constraint. This merging reduces the need for additional specialized components, achieving enhanced support rigidity without proportionally increasing structural complexity.
Data Source
AI summary
A frame-side pin hole is provided in an inner face which is a vertical face of a front side frame that is a part of a vehicle frame and in contact with a bracket face of an engine mount. An engine mount-side pin hole is provided in the bracket face which is a vertical face of the engine mount and in contact with the front side frame (inner face). Additionally, a displacement suppressing pin is inserted through the frame-side pin hole and the engine mount-side pin hole.