Camshaft Installation Tool for Precise Half-Thrust Washer Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The installation of a camshaft in internal combustion engines is challenging due to poor visibility, making it difficult to position the semi-circular member correctly between the cam holder and the cylinder head base portion without relying on worker intuition.
Innovation Solution
An installation tool with a bearing holder, head abutting portion, and tool concave portion is used to hold and position the bearing, allowing the knock member to adjust the cam holder's position relative to the semi-circular member, ensuring accurate alignment and assembly without relying on worker intuition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cam holder covers the bearing and the concave portion in the cam holder is adjusted to the semi-circular member, then the semi-circular member is covered with the cam holder from the above, but seeing the semi-circular member is difficult and the work relies on a hunch of a worker
Solution Approach 1:
The installation tool serves as an intermediary device that bridges the gap between the worker and the difficult-to-see semi-circular member. The tool includes a bearing holder to hold the bearing, a head abutting portion to abut against the cylinder head base portion, and a tool concave portion that receives the knock member. This intermediary tool enables precise positioning and adjustment of the cam holder relative to the semi-circular member even when visibility is poor, eliminating the need to rely on worker intuition while maintaining reliable assembly quality.
2Manufacturing precision
If the semi-circular member is inserted into the bearing side concave portion and holder side concave portion, then the camshaft can be installed, but the positioning is difficult without proper visibility
Solution Approach 1:
The installation tool is designed to enable the worker to perform precise positioning operations independently without requiring visual confirmation of the semi-circular member. The bearing holder automatically positions the bearing, the head abutting portion ensures correct positioning against the cylinder head base portion, and the tool concave portion guides the knock member for precise adjustment of the cam holder. This self-service design allows the tool to guide the worker's actions to achieve accurate positioning even when the worker cannot see the critical components.
3Device complexity
If a traditional installation method is used without specialized tools, then the process is simpler, but the assembling property relies on worker intuition and is inconsistent
Solution Approach 1:
The installation tool changes the physical parameters of the installation process by providing fixed geometric relationships between its components. The bearing holder, head abutting portion, and tool concave portion are designed with specific dimensions and orientations that ensure consistent positioning of the bearing and cam holder. This standardization of parameters transforms the installation process from one that relies on variable worker intuition to one that follows consistent, repeatable geometric constraints, thereby improving assembling consistency while accepting increased device complexity.
Data Source
AI summary
An installation tool installs a camshaft to a lower supporting portion. A cylinder head of an internal combustion engine includes the lower supporting portion, a cam holder, and a half-thrust washer. The camshaft is sandwiched between the cam holder and the lower supporting portion via a bearing. The half-thrust washer is inserted into respective annular groove disposed in an outer peripheral surface of the bearing and half annular groove disposed in the cam holder. The installation tool includes a bearing holder that holds the bearing, a head abutting portion abutted against a reference surface of the lower supporting portion with the bearing held, and an opposed concave knock portion into which a knock collar disposed in the cam holder is inserted to adjust a position of the half annular groove with respect to the half-thrust washer.