Thermostat Piston Guide Assembly for Engine Cooling
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Solution Overview
Problem
Conventional thermostat devices for cooling water systems in engines face challenges in assembly complexity, cost increase, and reliability issues due to the difficulty in fixing the thermo element assembly to the housing, leading to potential overcooling and operational failures during water injection.
Innovation Solution
A thermostat device with a piston guide and latching means that allows the thermo element assembly to be easily assembled and fixed to the device housing, providing axial movement and reducing load on the terminal connector, thus enhancing operational reliability and preventing overcooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the piston is inserted into a sealing member and then directly into the housing and held by metallic materials and elastic rubber, then the assembly is simple, but the flow of cooling water could tilt the thermo element section especially when the valve is opened, and a load resulting from the activation of the thermo element or water pressure is applied to the electrically connected section, deteriorating the electrical connection
Solution Approach 1:
The device is divided into separate functional sections: the piston assembly with electrical connections is separated from the housing by a piston guide structure. This segmentation allows the electrical connected section to be isolated from mechanical loads and cooling water flow, preventing deterioration of electrical connections while maintaining assembly simplicity.
Solution Approach 2:
A piston guide structure acts as an intermediary between the piston and the housing. This intermediary component guides the piston's movement and supports the electrical connections, preventing direct application of water pressure and mechanical loads to the electrical connected section, thereby maintaining reliable electrical connections.
2Ease of manufacture
If the piston is inserted into a sealing member and then directly into the housing and held by metallic materials and elastic rubber, then the assembly is simple, but the flow of cooling water could tilt the thermo element section especially when the valve is opened
Solution Approach 1:
The piston guide structure serves as an intermediary that stabilizes the thermo element section. It provides a guided pathway for the piston and supports the thermo element assembly against the tilting force generated by cooling water flow, preventing instability while maintaining simple assembly procedures.
Solution Approach 2:
The piston guide structure provides preemptive support to the thermo element section before cooling water flow can cause tilting. By establishing a stable guided structure in advance, the system prevents the destabilizing effect of water flow on the thermo element section.
3Device complexity
If a conventional assembly method is used without a piston guide, then the assembly process is simpler, but the load from thermo element activation or water pressure deteriorates the electrical connection between the terminal and the thermo element section
Solution Approach 1:
The assembly is segmented into distinct functional zones: the electrical connection zone supported by the piston guide, and the mechanical actuation zone. This segmentation isolates the electrical connections from mechanical loads, maintaining reliability while adding only minimal structural complexity through the piston guide.
Solution Approach 2:
The piston guide structure performs multiple functions simultaneously: it guides piston movement, supports electrical connections, and protects against mechanical loads. This multi-functionality justifies the added structural complexity by delivering multiple benefits that improve electrical connection reliability.
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 solution simplifies assembly, reduces the risk of overcooling, and improves the reliability of the electric connection by allowing the thermo element assembly to move axially with the valve, preventing vacuum formation and ensuring proper valve operation during water injection.
Implementation Method 1
a thermal expansion unit that is provided within the cylinder container and changes its volume with a change in temperature
Implementation Method 2
a heating element that is provided within a casing of the piston and heats the thermal expansion unit when supplied with current
Data Source
AI summary
A thermostat device has a thermo element assembly (10) configured by a piston (3), a thermal expansion unit that changes volume with a change in temperature, to reciprocate a cylinder container (4) with respect to the piston, and a heating element (H) that is provided in a casing of the piston and heats the thermal expansion unit (W) when supplied with current. An assembling hole (11) is provided in the device housing to hold an outer end of the thermo element assembly by causing the outer end to pass therethrough toward the outside of the device. A piston guide (13) is provided at a section on the upper end side of the piston configuring the thermo element assembly. An outer end of the piston guide is integrally joined to the housing side while being inserted from the inside of the device housing (2) into the assembling hole to pass therethrough.