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Variable displacement gear pump

a gear pump and variable displacement technology, applied in the direction of liquid fuel engines, machines/engines, rotary piston liquid engines, etc., can solve the problems of less competitive and popular, unsatisfactory fluid leakage, and difficult use, so as to prevent fluid leakage, prevent fluid leakage, and prevent fluid leakage

Inactive Publication Date: 2020-05-07
JANG SOON GIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention introduces a simplified way to use a gear ring and gear block to prevent fluid leakage when shifting gears in a variable displacement gear pump. This allows for the creation of more competitive and cost-effective gear pumps and motors. The gear ring and gear block prevent fluid leakage between the gears, and a minimal change is made to the structure of the gear pump to allow for easy production and use in various applications.

Problems solved by technology

The width in which two gears are engaged with each other may easily be changed by moving the gears in opposite directions along the gear shafts, but this way may cause an undesired fluid leak.
However, the conventional methods are too tricky to be employed for producing variable displacement gear pumps, are prone to miss, or fail to, address hidden issues, or cause excessive cost consumption, resultantly less competitive and popular as compared with vane- or piston-type variable displacement pumps.

Method used

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  • Variable displacement gear pump
  • Variable displacement gear pump
  • Variable displacement gear pump

Examples

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Embodiment Construction

[0055]A hydraulic gear pump and a hydraulic gear motor have the same basic structure. Thus, the description of the hydraulic gear pump may apply to the hydraulic gear motor as well. Generally, external, internal, and trochoid types of hydraulic gear pumps are used. The description of the external hydraulic gear pump may also apply to lobe pumps. According to the present invention, described are the structure of each of the three types of variable displacement gear pumps and a method therefor.

[0056]FIG. 1 illustrates a fixed gear ring 11, a movable gear ring 12, a fixed gear 14, and a movable gear 13 that constitute a variable displacement external gear pump. FIG. 2 illustrates a casing 22, a fixed cover 21, a movable cover 23, and a movable gear block hole 27. A portion of the casing 22, which abuts the teeth tips of the movable gear, is referred to as a fixed casing 28. The fixed gear 14 is fitted into the movable gear ring 12 and is installed using a smaller hole of the fixed cove...

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PUM

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Abstract

A variable displacement gear pump comprises a fixed gear, a movable gear movable, a fixed gear ring fitted over the movable gear, a movable gear ring fitted over the fixed gear, a fixed cover having a hole in which the fixed gear ring rotates, a movable cover having a hole in which the movable gear ring rotates, a fixed gear block attached to the fixed cover, and a movable gear block attached to the movable cover. The fixed gear is engaged with the movable gear. The movable gear ring rotates in the hole of the movable cover, and the fixed gear ring rotates in the hole of the fixed cover. The movable gear, together with the movable cover, the movable gear, and the movable gear block, move along the direction of the shaft to change a width in which the fixed gear is engaged with the movable gear.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This patent application is a divisional application of U.S. patent application Ser. No. 15 / 579,196, filed on Dec. 2, 2017, which is a national-stage application of PCT / KR2016 / 006390 filed on Jun. 16, 2016, which claims priority under 35 U.S.C. § 119 to Korean Patent Application Nos. 10-2015-0113627, filed on Aug. 12, 2015, and 10-2016-0009861, filed on Jan. 27, 2016, in the Korean Intellectual Property Office, the disclosures of which are incorporated by reference herein in their entireties.TECHNICAL FIELD[0002]A hydraulic pump or hydraulic motor may be made of a vane, a piston, or a gear and has different characteristics. A hydraulic pump or hydraulic motor using a gear presents more difficulty than one using a vane or piston in producing it a variable displacement type.DISCUSSION OF RELATED ART[0003]A hydraulic gear pump and a hydraulic gear motor have the same basic structure, and they may be classified into an external, internal, or t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04C14/18F04C2/08F16H61/00
CPCF04C2/084F04C14/185F16H61/0025F01C21/10F04C11/001F04C2/18F04C2/101F04C2/22F04C2/10F04C2/102
Inventor JANG, SOON GIL
Owner JANG SOON GIL