Internal Gear Fluid Machine with Tilting Compensation Ring
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Solution Overview
Problem
Existing internal gear fluid machines lack the ability to operate efficiently with different conveying directions while maintaining similar or identical conveying pressure and throughput, limiting their versatility in applications such as hydraulic pumps for double-acting hydraulic cylinders.
Innovation Solution
The internal gear fluid machine incorporates a compensation ring with tilting support devices and an anti-rotation device, allowing the ring gear to pivot and adjust its position based on the direction of rotation, ensuring consistent sealing and fluid handling performance across opposite directions of rotation by altering the tilting axis and applying spring force for enhanced sealing at the second sealing point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the ring gear is fixed rigidly in the housing, then the structural simplicity is improved, but the ability to adapt to different conveying directions and maintain consistent sealing is worsened
Solution Approach 1:
The ring gear is designed with dynamic adaptability through the compensation ring and support devices that allow the ring gear to tilt and adjust its position based on the direction of rotation. This enables the fluid machine to maintain consistent sealing and conveying properties in both directions of rotation, transforming a static fixed structure into a dynamically adaptive one.
2Adaptability or versatility
If the compensation ring is allowed to pivot freely, then the adaptability to different conveying directions is improved, but the control over sealing position and consistency is worsened
Solution Approach 1:
The support devices act as intermediary elements between the housing and the compensation ring. They provide controlled pivot points and constraints that guide the compensation ring's movement, ensuring that the ring gear tilts to the correct position for optimal sealing in each direction of rotation while maintaining precise control over the sealing position.
Solution Approach 2:
The system changes the tilt angle parameter of the ring gear based on the direction of rotation. By adjusting the tilt angle through the compensation ring mechanism, the fluid machine optimizes the sealing contact between gear teeth for both clockwise and counter-clockwise operation, maintaining consistent conveying properties despite parameter changes.
3Reliability
If spring force is applied to enhance sealing at the second sealing point, then the sealing reliability is improved, but the device complexity is worsened
Solution Approach 1:
The spring force acts as a counterbalancing force that compensates for variations in sealing contact pressure. By applying this elastic counterforce, the system maintains reliable sealing at the second sealing point (tooth tip contact) regardless of operational conditions, using a simple elastic element rather than a complex active control system.
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 design enables the internal gear fluid machine to maintain identical or nearly identical conveying properties in opposite directions of rotation, ensuring reliable operation and efficient fluid handling regardless of the direction of rotation, particularly at low speeds and during rapid changes in direction.
Implementation Method 1
the spring element applies spring force to the compensation ring in such a way that the internal toothing at the second sealing point is forced against the external toothing
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to an internal gear fluid machine (1) having a housing (2), a ring gear (3) mounted rotatably about a ring gear rotation axis (5) in the housing (2), and a pinion (4) mounted rotatably about a pinion rotation axis (6) offset parallel to the ring gear rotation axis (5) in the ring gear (3). Viewed in cross-section, internal teeth (7) of the ring gear (3) mesh sealingly with external teeth (8) of the pinion (4) in an engagement region (9) fixed to the housing to form a first sealing point (10), and, to form a second sealing point (11), at least one tooth tip (12) of the internal teeth (7) bears sealingly against a tooth tip (13) of the external teeth (8), or both the tooth tip (12) of the internal teeth (7) and the tooth tip (13) of the external teeth (8) bear against a filler piece on opposing sides. Between the internal teeth (7) and the external teeth (8), there is a first fluid space (16) on one side of a pressure chord (14) which intersects the first sealing point (10) and the second sealing point (11), and a second fluid space (17) on the other side of the pressure chord (14). The ring gear (3) is mounted rotatably in a compensation ring (18) which is accommodated with play in the radial direction in a compensation ring holder (20) of the housing (2), the compensation ring (18) being held on the housing (2) such that it can pivot about a pivot axis into different pivot positions and being fixed in the circumferential direction inside the housing (2) by means of an anti-rotation means (25). According to the invention, the compensation ring (18) is assigned multiple support devices (21), which each form a tilting bearing for tilting the compensation ring (18) relative to the housing (2) about a tilting axis.