Internal gear pump with crescent block

By introducing a crescent block structure into the internal gear pump and utilizing the radial compensation design of rubber rods and springs, the sealing performance and tooth tip clearance control problems of traditional internal gear pumps are solved, achieving bidirectional rotation and efficient sealing, and improving the stability and flexibility of the pump oil.

CN224469303UActive Publication Date: 2026-07-07HUNAN OIL PUMP
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Patent Information

Application Number
CN202522145147.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-10-11
Publication Date
2026-07-07
Estimated Expiration
2035-10-11

AI Technical Summary

Technical Problem

Traditional internal gear pumps suffer from poor sealing performance and inaccurate control of tooth tip clearance when rotating in one direction, which affects pump oil efficiency and stability, and makes it difficult to achieve bidirectional rotation.

Method used

The pump adopts an internal gear pump design with crescent blocks. Radial compensation is achieved through the cooperation of the outer crescent blocks with the rubber rod and spring of the inner gear ring, ensuring that the inner and outer crescent blocks fit tightly. The combination of locating pins and rotating pins improves the sealing performance and the control accuracy of the gear tip clearance.

Benefits of technology

It achieves bidirectional rotation capability of internal gear pump, improves sealing performance and control accuracy of gear tip clearance, reduces leakage and mechanical noise, and enhances pump oil stability and flexibility.

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Abstract

The utility model provides an internal gear pump with crescent blocks, which comprises a pump body, a pump cover, an inner gear ring and an outer gear which is internally meshed with the inner gear ring, an outer crescent block and an inner crescent block are arranged between the inner gear ring and the outer gear, and the outer crescent block is provided with an outer cambered surface which can be attached to a plurality of tooth crests of the inner gear ring; the inner crescent block is composed of a first inner crescent block body and a second inner crescent block body, the first inner crescent block body and the second inner crescent block body are each provided with an inner arc face capable of being attached to a plurality of tooth crests of the outer gear, and a positioning pin is installed between the first inner crescent block body and the second inner crescent block body. Pin holes are formed in the ends, close to the positioning pin, of the first inner crescent block and the second inner crescent block and used for installing a rotating pin, and the first inner crescent block and the second inner crescent block can rotate around the rotating pin. Notches are formed in the positions, corresponding to the two positioning pins, of the middle of the outer crescent block, rubber rods and elastic pieces are arranged between the outer crescent block and the first inner crescent block and between the outer crescent block and the second inner crescent block, and the radial gaps between the inner crescent block and the outer crescent block are compensated.
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