Hydraulic Piston Slider Shoe Coating With Conical Channel Sealing
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Solution Overview
Problem
The production of hydraulic pistons with reduced friction between the ball head and slider shoe is complex due to the precise positioning required for injecting plastic material into the gap between these components, which complicates the assembly process.
Innovation Solution
A conical sealing surface is introduced at the end of the through channel, allowing a pin to be inserted from the opposite side of the ball head, preventing molten plastic from entering the channel while still forming the inner coating, and a two-section through channel design ensures hydraulic fluid passage without throttling, enhancing the connection between the plastic material and the slider shoe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pin is inserted through the through channel to guide plastic material, then the plastic material can be distributed into the gap between slider shoe and ball head, but the positioning of all parts and the tool becomes very precise and complicated
Solution Approach 1:
Instead of inserting the pin from the ball head side through the through channel, the pin is now inserted from the opposite side (slider shoe side). This inversion changes the insertion direction and allows the pin to seal against a sealing surface that surrounds the opening of the through channel, preventing plastic material from entering the through channel while still forming the inner coating. This resolves the positioning complexity by allowing easier alignment from the slider shoe side.
Solution Approach 2:
The sealing surface is extracted as a separate functional element at the end of the through channel. This sealing surface with conical form creates a sealing interface that prevents plastic material from entering the through channel while allowing the pin to be inserted and positioned more easily. The sealing surface is positioned such that its inner diameter is smaller than the inner diameter of the inner coating, creating the necessary seal.
2Reliability
If the pin seals against the sealing surface to prevent plastic material from entering the through channel, then the plastic material can form the inner coating of the through bore, but the sealing surface must be precisely positioned
Solution Approach 1:
The sealing surface is given a conical form (a type of curved surface) instead of a flat or cylindrical shape. This conical geometry provides self-centering properties that make it easier to position the pin correctly. The conical shape allows the pin to automatically assume the correct position during insertion, reducing the requirement for precise pre-positioning while maintaining reliable sealing.
Solution Approach 2:
The sealing surface has an asymmetric conical shape rather than a symmetric cylindrical or flat shape. This asymmetric geometry creates a unique sealing interface that guides the pin into the correct position. The conical form with its varying diameter provides a tapered guidance path that naturally centers the pin, reducing positioning precision requirements while ensuring reliable sealing.
3Ease of manufacture
If the through channel has a reduced inner diameter section for the sealing surface, then the sealing surface can be accommodated, but the hydraulic fluid passage may be throttled
Solution Approach 1:
The through channel is divided into multiple sections with different inner diameters. One section has a reduced inner diameter to accommodate the sealing surface, while another section maintains the same inner diameter as the through bore to ensure adequate hydraulic fluid flow. This segmentation allows the sealing function and hydraulic flow function to be satisfied in different parts of the same channel structure.
Solution Approach 2:
The through channel has different local qualities in different sections. The section with the reduced inner diameter provides the necessary space for the sealing surface and pin sealing interface, while the section with the larger inner diameter ensures adequate hydraulic fluid passage without throttling. Each section is optimized for its specific function, allowing both sealing and hydraulic flow requirements to be met.
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 solution simplifies the production process by allowing easier alignment and injection of plastic material, maintaining hydraulic balance and providing a stable, durable connection between the plastic and metal components, reducing friction and improving mechanical stability.
Implementation Method 1
a pin is inserted into the piston shaft and through the through channel until it reaches the opening of the through channel. A tip on the pin forms a flow guide for distribution of the molten plastic which is introduced through the through bore.
Implementation Method 2
A conical sealing surface is introduced at the end of the through channel, allowing a pin to be inserted from the opposite side of the ball head, preventing molten plastic from entering the channel while still forming the inner coating.
Implementation Method 3
A conical form makes it easy to centre the pin with respect to the through channel, so that the pin automatically assumes the correct position.
Implementation Method 4
a second section of the through channel has the same inner diameter as the through bore. Thus, hydraulic fluid can pass through the through channel and through the through bore without substantial throttling, so that a hydraulic balance on the slider shoe can be achieved.
Implementation Method 5
In contrast to oil water has not lubricating characteristics, so that the friction between sliding surfaces must be reduced in another way. In the present case, the friction between the ball head and the slider shoe is reduced by the plastic material.
Data Source
AI summary
A piston (1) having a piston shaft (2), a ball head (3) at one end of the piston shaft (2), and a slider shoe (4) mounted to the ball head (3), wherein the ball head (3) has a through channel (5), the slider shoe (4) has a sliding surface (6) and a through hole (7) in communication with an end of the through channel (5), and a plastic material (8) is arranged in a gap between the slider shoe (4) and the ball head (3) and forms an inner coating (9) of the through hole (7). The production of such a piston should be facilitated. To this end a sealing surface (14) is arranged at the end of the through channel (5) wherein the sealing surface (14) surrounds the opening of the through channel (5) into the through bore (7) and an inner diameter of the sealing surface (14) is smaller than an inner diameter of the inner coating (9) of the through bore (7).