Internal Gear Fluid Machine Retaining Pin Mounting
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Solution Overview
Problem
Existing inner lane fluid machines face challenges in achieving a longer lifespan, greater permanent strength, and cost-effective manufacturing while maintaining high performance.
Innovation Solution
The design incorporates a holding pin stored on the housing wall via an intermediate piece made of a higher-strength material than the housing wall material, allowing for reliable load distribution and preventing deformation of the housing wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the retaining pin is directly mounted on the housing wall, then the device complexity is reduced, but the housing wall material must have high strength which increases manufacturing cost
Solution Approach 1:
The patent introduces an intermediate piece as a mediator between the retaining pin and the housing wall. This intermediate piece has higher strength than the housing wall material, allowing the retaining pin to be mounted without requiring the housing wall itself to be made of high-strength material. This resolves the contradiction by adding a component that enables simple mounting while avoiding the need for expensive housing wall materials.
2Strength
If the housing wall is made of high-strength material, then the permanent strength and service life are improved, but the manufacturing cost increases
Solution Approach 1:
The patent applies local quality by concentrating the high-strength requirement only where needed - in the intermediate piece that bears the mounting loads - while the housing wall can be made of lower-strength, more cost-effective material. This localized application of high strength resolves the contradiction between overall machine strength and manufacturing cost.
Solution Approach 2:
The intermediate piece acts as a mediator that protects the housing wall from high-stress mounting loads. By introducing this intermediate component with superior mechanical properties, the housing wall material can be selected based on cost-effectiveness rather than being constrained by strength requirements, thus resolving the contradiction between strength and manufacturing cost.
3Reliability
If the retaining pin is rotatably mounted via an intermediate piece, then the fatigue strength is improved, but the device complexity increases
Solution Approach 1:
The intermediate piece serves as a mediator that enables rotatable mounting of the retaining pin, which improves fatigue strength by allowing movement and stress distribution. While this adds a component, the intermediate piece is a simple element that minimizes the increase in overall device complexity while achieving the reliability benefit.
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to an internal gear fluid machine comprising a first gearwheel, which has an external toothing system and is rotatably mounted about a first axis of rotation, and a second gearwheel, which has an internal toothing system meshing in some regions with the external toothing system in an engagement region and which is rotatably mounted about a second axis of rotation which is different from the first axis of rotation, wherein a filler piece is arranged between the first gearwheel and the second gearwheel away from the engagement region, wherein said filler piece bears on one side against the external toothing system and on the other side against the internal toothing system in order to divide a fluid space located between the first gearwheel and the second gearwheel into a first fluid chamber and a second fluid chamber, and wherein housing walls of a machine housing of the internal gear fluid machine are arranged on both sides of the first gearwheel and the second gearwheel in the axial direction with regard to the first axis of rotation, and the filler piece is mounted on the machine housing by means of at least one holding pin which acts on at least one of the housing walls. It is provided here that the holding pin is mounted rotatably on the housing wall via at least one intermediate piece, wherein the housing wall consists of a housing wall material and the intermediate piece consists of an intermediate piece material which is different from the housing wall material. The invention further relates to a method for producing an internal gear fluid machine.