KR-20260066303-A - Compact double row gear and its manufacturing method

Abstract

The present invention relates to a compact double-row gear and a method for manufacturing the same, and more specifically, to a compact double-row gear and a method for manufacturing the same in which a plurality of spur gears are arranged in the longitudinal direction of the shaft, and the pitch circle diameter (PCD) and the number of gear teeth are reduced for the same gear module according to the relationship between the pitch circle diameter, which is directly proportional to the gear module, and the number of gear teeth, which is inversely proportional to the gear module, thereby reducing the radial size while maintaining strength. The present invention allows for the arrangement of multiple gears along the longitudinal direction of a single axis, wherein the pitch circle diameter and the number of gear teeth are reduced compared to the same gear module, so that the tip circle diameter is formed to be small.

Inventors

• 이창열
• 김은우
• 전어진
• 김의진

Assignees

• 인하대학교 산학협력단

Dates

Publication Date

20260512

Application Date

20241104

Claims (5)

1. A compact double-row gear in which multiple spur gears are arranged along the longitudinal direction of an axis on a single axis, with the pitch circle diameter and the number of gear teeth reduced compared to the same gear module, so that the tip circle diameter is formed small.
2. In Article 1, A compact double-row gear in which the diameter of the tooth root circle of the above spur gear is formed to be smaller than the outer diameter of an adjacent shaft.
3. In Article 1, A compact double-row gear in which adjacent spur gears in the above-mentioned axial direction are arranged such that there is a phase difference in the circumferential direction.
4. In Article 1, The above shaft is a compact double-row gear in which a reinforcing flange is formed between adjacent spur gears in the axial direction.
5. In a method for manufacturing a compact double-row gear according to any one of claims 1 to 4, A method for manufacturing a compact double-row gear, wherein the spur gear and shaft of the compact double-row gear are manufactured by 3D printing additive manufacturing using metal powder.

Description

Compact double row gear and its manufacturing method The present invention relates to a compact double-row gear and a method for manufacturing the same, and more specifically, to a compact double-row gear and a method for manufacturing the same in which a plurality of spur gears are arranged in the longitudinal direction of the shaft, and the pitch circle diameter (PCD) and the number of gear teeth are reduced for the same gear module according to the relationship between the pitch circle diameter, which is directly proportional to the gear module, and the number of gear teeth, which is inversely proportional to the gear module, thereby reducing the radial size while maintaining strength. Generally, gear systems that combine gears and various drive components are applied in the aerospace and various industrial fields, and are utilized in diverse drive systems requiring power transmission. In addition, in the aerospace sector, various gear devices are being actively operated and researched both domestically and internationally to support the missions of spacecraft and satellites. The configuration of the gear unit according to the application purpose is determined by design conditions such as transmission rotational speed and force. At this time, through the above determination process, the number of gear teeth, module, and width of the gear component are determined, and the gear module serves as a measure for determining the height of the gear teeth. The radial size of the gear component is determined according to the number of teeth and module selected in the above determination process, and this is determined by the pitch circle and addendum circle required to design and configure the gear device. Since gears operate on the principle that gear teeth must mesh continuously, the radial size of the gear, depending on the module and number of teeth, can be a constraint on design conditions. For example, when a high gear ratio is configured with two gears, one side is given a large number of teeth and has an excessively large pitch circle diameter (PCD). At this time, a gear train that arranges gears by adjusting the gear ratio and PCD in multiple steps can alleviate the excessive design size of the gear unit, but there is a problem of increased complexity of the drive components. Therefore, if a gear device such as a gear train can be configured with an appropriate number of gears without having an excessive design size (radial), it has the effect of reducing design size constraints in the application of gear devices not only in aerospace dealing with space and satellites where design clearance is limited, but also in various mechanical industries. Thus, there is a need for the development of technology to reduce the radial size while maintaining the gear ratio according to PCD in gear design. FIGS. 1 (a) and (b) are drawings illustrating a compact double-row gear according to an embodiment of the present invention. FIG. 2 is a diagram illustrating the relationship between the module of a gear, the pitch circle diameter (PCD), and the number of gear teeth. FIG. 3 is a drawing illustrating an example of gear meshing between compact double-row gears according to one embodiment of the present invention. FIGS. 4(a) and (b) are drawings illustrating a compact double-row gear according to another embodiment of the present invention. FIGS. 5(a) and (b) are drawings illustrating a compact double-row gear according to another embodiment of the present invention. The embodiments of the present disclosure are illustrative for the purpose of explaining the technical concept of the present disclosure. The scope of rights according to the present disclosure is not limited to the embodiments presented below or the specific description thereof. All technical and scientific terms used in this disclosure, unless otherwise defined, have the meaning generally understood by those skilled in the art to which this disclosure pertains. All terms used in this disclosure are selected for the purpose of further clarifying this disclosure and are not selected to limit the scope of the rights under this disclosure. Expressions such as “comprising,” “comprising,” “having,” etc. used in this disclosure should be understood as open-ended terms implying the possibility of including other embodiments, unless otherwise stated in the phrase or sentence containing such expressions. Unless otherwise stated, singular expressions described in this disclosure may include a plural meaning, and this applies likewise to singular expressions described in the claims. Hereinafter, preferred embodiments of a compact double-row gear and a method for manufacturing the same according to the present invention will be described in detail with reference to the attached drawings. FIGS. 1 (a) and (b) are drawings illustrating a compact double-row gear according to one embodiment of the present invention, FIG. 2 is a drawing for explaining the relationship between