Hydraulic Camshaft Rotor Sealing via Segmented Joining Surfaces
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Solution Overview
Problem
Existing camshaft adjusting devices face challenges in producing rotor wheels with defined contact between joining surfaces, leading to undefined contact characteristics and ineffective sealing of fluid ducts, particularly due to shape tolerances in powder metallurgy components.
Innovation Solution
Incorporating sealing means such as elevations and notches on the joining surfaces of the rotor wheel's body parts, which engage to form a sealed contact and seal off fluid ducts, even with dimensional and positional tolerances, allowing for effective sealing and positioning of the body parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If body parts are joined through powder metallurgy with shape tolerances, then manufacturing is simplified, but contact between joining surfaces becomes undefined and sealing fails
Solution Approach 1:
The joining surface is segmented into a first joining surface with elevations and a second joining surface with corresponding depressions. This segmentation allows the elevations to engage with the depressions, creating a defined contact mechanism that overcomes the undefined contact problem while maintaining the simplicity of powder metallurgy manufacturing.
Solution Approach 2:
The elevations and depressions act as intermediary elements between the two body parts. These intermediary features engage with each other to establish a defined contact relationship, mediating the connection between the powder metallurgy components and ensuring proper sealing without requiring high manufacturing precision.
2Ease of operation
If fluid ducts are formed through drilling processes, then fluid flow is achieved, but production complexity and difficulty increase
Solution Approach 1:
The fluid ducts are formed as depressions in the green body during the molding process, before sintering and assembly. This preliminary action integrates the fluid duct formation into the manufacturing process itself, eliminating the need for subsequent drilling operations and reducing production complexity while ensuring proper fluid flow pathways.
3Ease of operation
If joining surfaces are made flat for assembly, then assembly is simplified, but sealing effectiveness decreases due to tolerances
Solution Approach 1:
The joining surfaces have different local qualities: the first joining surface has elevations that protrude, while the second joining surface has corresponding depressions. This local quality differentiation ensures that even with dimensional and positional tolerances, the elevations and depressions engage to create a reliable seal, maintaining sealing effectiveness without requiring overly complex assembly procedures.
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 sealing means ensure a defined contact between the joining surfaces, effectively sealing the fluid ducts and enhancing the sealing effect, enabling reliable operation of the camshaft adjusting device by maintaining a sealed fluid channel, even with slight plastic deformation during assembly.
Implementation Method 1
at least one sealing means (25) is provided in or on at least one joining surface (19a, 20a), with the sealing means (25) being designed such that the fluid ducts (17, 18) are sealed off, such that defined contact is obtained thereby between the joining surfaces (19a, 20a), which are placed on top of one another
Data Source
AI summary
The invention relates to a camshaft adjusting device (1) for an internal combustion engine and to a method for producing a camshaft adjusting device having a stator wheel (10) and a rotor wheel (11), wherein the rotor wheel (11) has a first body part (19) and a second body part (20), wherein a joining surface (19a) of the first body part (19) and a joining surface (20a) of the second body part (20) are joined to one another, and wherein depressions (21, 22) are formed in at least one of the joining surfaces (19a, 20a) in order to form the fluid ducts (17, 18) at least in sections. In order to provide a camshaft adjusting device (1) with an improved rotor wheel (11), which is formed from two body parts (19, 20), which can be joined to one another in an improved manner, a provision according to the invention is that at least one sealing means (25, 26) be provided in or on at least one joining surface (19a, 20a) with the sealing means being designed such that the fluid ducts (17, 18) are sealed off and that defined contact is obtained between the joining surfaces (19a, 20a), which are placed on top of one another.