Water Jacket Casting Design for Compact Engine Core
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing water-cooled four-cycle engines require three opening portions for casting the water jacket, leading to complex die structures, high costs, and increased components and assembly steps, making the engine less compact.
Innovation Solution
The engine design is optimized to form a water jacket using only two orthogonal opening portions, allowing for two lid plates to close them securely, reducing the number of components and assembly steps, and enhancing casting ease, thereby reducing costs and improving compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If three opening portions are provided to form the water jacket by casting out, then the water jacket can be formed, but the structure of the casing dies becomes complicated and costs increase
Solution Approach 1:
The invention changes the dimensional arrangement of opening portions from a distributed three-opening configuration to a concentrated two-opening configuration. Specifically, both opening portions are arranged in the upper surface of the cylinder head, allowing the water jacket to be formed by casting out in a single directional plane, thereby simplifying the die structure while maintaining the water jacket formation capability
2Ease of manufacture
If three opening portions are provided to form the water jacket, then the water jacket can be formed, but the number of lid plates and assembling steps increases
Solution Approach 1:
The invention merges the function of multiple opening portions into two consolidated opening portions located in the upper surface of the cylinder head. This merging reduces the number of required lid plates from three to two, and consequently reduces the number of assembling steps needed to water-tightly close all opening portions, thereby simplifying the overall assembly process
3Ease of manufacture
If three opening portions are provided to form the water jacket, then the water jacket can be formed, but the engine becomes less compact
Solution Approach 1:
The invention consolidates the opening portions into two locations arranged orthogonally in the upper surface of the cylinder head, rather than distributing three openings across multiple surfaces. This dimensional consolidation reduces the spatial footprint required for the water jacket formation process, thereby improving engine compactness while maintaining casting feasibility
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 simplifies the casting process, reduces the number of components and assembly steps, lowers costs, and enhances cooling efficiency by expanding heat radiation surfaces, making the engine more compact and cost-effective.
Implementation Method 1
a water jacket including a cylinder jacket and a head jacket is formed in the engine core, the cylinder jacket surrounding the cylinder bore, the head jacket communicating with the cylinder jacket and surrounding the combustion chamber
Data Source
AI summary
In a water-cooled four-cycle engine, an engine core including a cylinder block, a cylinder head and a first crankcase half body is formed as a unitary part cast integrally; a water jacket including a cylinder jacket and a head jacket is formed in the engine core; and a timing-belt chamber being adjacent to the cylinder jacket is provided in a side portion of the engine core. A first opening portion for forming a first semi-peripheral portion of the cylinder jacket on a side opposite from the timing-belt chamber by casting out is provided in a side surface of the cylinder block. Second and third opening portions for forming a second semi-peripheral portion of the cylinder jacket and the head jacket as well as the timing-belt chamber, respectively, by casting out are provided in an upper surface of the cylinder head.