Segmented Pneumatic Clutch Actuator With Wear-Resistant Guide Shaft
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Solution Overview
Problem
Concentric pneumatic clutch actuators for commercial vehicles face challenges in manufacturing due to the complexity and high cost of steel components, which are required for their construction, and the need for mechanical strength and reliability.
Innovation Solution
A multi-part construction for the pneumatic actuator where the main body is made from a cost-effective, easy-to-machine material like aluminum, and the guide shaft is made from a higher wear-resistant material like steel, with a separate fixing portion and radial collar for secure fixation, reducing manufacturing costs and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pneumatic body is made entirely from steel to ensure wear resistance and mechanical strength, then reliability is improved, but manufacturing cost and difficulty increase
Solution Approach 1:
The pneumatic body is divided into two separate components: the main body made from cost-effective material (aluminum or plastic) and the guide shaft made from wear-resistant steel. This segmentation allows each component to be optimized independently for its specific functional requirements while reducing overall manufacturing cost.
Solution Approach 2:
Different materials are applied to different parts of the pneumatic body based on local functional requirements. The guide shaft, which requires high wear resistance due to sliding contact with the piston, is made from steel. The main body, which requires complex cavity formation but not direct sliding contact, is made from easier-to-manufacture materials like aluminum or plastic.
2Strength
If the pneumatic body is made from steel to ensure mechanical strength, then reliability is improved, but manufacturing complexity and time increase
Solution Approach 1:
The pneumatic body is segmented into a main body and a guide shaft that can be manufactured separately using different processes optimized for each material's properties, reducing overall manufacturing time.
Solution Approach 2:
Steel is applied locally only to the guide shaft where mechanical strength and wear resistance are critical, while the main body uses materials that can be manufactured more quickly through casting or molding processes.
3Adaptability or versatility
If the pneumatic body has complex shapes with multiple cavities, then functionality is improved, but manufacturing cost increases
Solution Approach 1:
The complex pneumatic body with multiple cavities is segmented into a main body and a separate guide shaft. The main body can be manufactured using cost-effective casting or molding processes that handle complex geometries well, while the simpler guide shaft is made from steel.
Solution Approach 2:
Complex cavity structures are concentrated in the main body where they can be efficiently formed through casting or molding, while the guide shaft maintains a simpler cylindrical geometry suitable for steel manufacturing processes.
Data Source
AI summary
A pneumatic actuator (1) includes a pneumatic piston (4) and a pneumatic body (6) that includes a main body (8) and a guide shaft (10) for guiding the pneumatic piston (4). A pneumatic chamber (14) is defined between the guide shaft (10) and the main body (8). The pneumatic piston (4) is received in the pneumatic chamber (14) and slidably arranged on the guide shaft (10). The main body (8) and the guide shaft (10) are separate elements, wherein the guide shaft (10) is fixed to a fixing portion (16). The main body (8) is made from a first material (M1) and the guide shaft (10) is made from a second material (M2) having a higher wear resistance than the first material (M1). The actuator may be used in a clutch assembly (104) and a commercial vehicle (101).