KR-20260062412-A - Housing assay with improved oil churning function

KR20260062412AKR 20260062412 AKR20260062412 AKR 20260062412AKR-20260062412-A

Abstract

The present invention relates to a housing assembly applied to an off-axis (lay-shaft) type reduction gear. The housing assembly of the present invention, which has an improved oil churning function, improves the outer surface shape and inner surface shape of the cover housing and middle housing so that lubricating oil is uniformly supplied to each bearing and gear during oil churning, thereby having the effect of improving lubrication performance and cooling performance.

Inventors

김대욱
정진호
세르기 샤고프카

Assignees

현대모비스 주식회사

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (10)

In a housing assembly in which multiple gears of a vehicle reduction gear are coupled and the oil churning function is improved, A cover housing having a differential gear and a first counter gear coupled to one side; A middle housing having an input gear and a second counter gear connected to the first counter gear coupled to one side, one side facing one side of the cover, and a lower end communicating with a sump space; and A housing assembly with improved oil churning function, characterized by including an oil guide portion formed by processing on the cover housing and the middle housing to guide the flow direction of the churned oil.
In Article 1, The above oil guide section is, A housing assembly with improved oil churning function, characterized by including a guide groove formed to a predetermined depth on the outer edge of the cover housing.
In Paragraph 2, The above guide home is, A housing assembly with improved oil churning function, characterized by being formed on the edge of the cover housing corresponding to the upper side of the first counter gear.
In Paragraph 2, The above guide home is, A housing assembly with improved oil churning function, characterized by having a curvature greater than a predetermined amount and being formed in a streamlined shape.
In Paragraph 2, The above oil guide section is, A housing assembly with improved oil churning function, characterized by further including a first guide rib formed protruding to a predetermined height on one surface of the cover housing and extending inward from one end of the guide groove.
In Paragraph 5, The above-mentioned first guide rib is, A housing assembly with improved oil churning function, characterized by being formed to be inclined at a predetermined angle from a direction perpendicular to the ground.
In Paragraph 5, The above oil guide section is, It includes a second guide rib formed protruding from one surface of the middle housing and formed at a position corresponding to the first guide rib, The above second guide rib is, A housing assembly with improved oil churning function, characterized by contacting the first guide rib and allowing oil to be transmitted from the first guide rib to the second guide rib.
In Paragraph 2, The above oil guide section is, A housing assembly with improved oil churning function, characterized by further including a third guide rib formed protruding at a predetermined height on one surface of the cover housing and extending from the other end of the guide groove toward the center side of the first counter gear.
In Article 1, The above middle housing is, It includes a gear case portion formed concavely at a position corresponding to the differential gear, and The above oil guide section is, A housing assembly with improved oil churning function, characterized by further including a fourth guide rib formed protruding to a predetermined height on the inner surface of the gear case portion and extending from the edge of the inner surface toward the center of the differential gear.
In Article 9, The above-mentioned fourth guide rib is, A housing assembly with improved oil churning function, characterized by being formed to be inclined at a predetermined angle from a direction perpendicular to the ground.

Description

Housing assay with improved oil churning function The present invention relates to a housing assembly applied to an off-axis (lay-shaft) type reduction gear. Off-axis (lay-shaft) is a type of reduction gear used in electric motors that operates by having the largest differential gear pump oil up and supply it to the bearings and gears, rather than spraying oil at specific points to the gears that cause contact friction between the bearings and solids. The areas primarily supplied with oil vary depending on the axial position of the differential gear and the angle of the helical gear. However, in conventional off-axis (lay-shaft) designs, the axial position and helical angle of the differential gear are designed to be advantageous only for lubrication within the cover, causing the main oil flow to form along the inner surface of the cover, resulting in a problem where the bearings located on the middle housing side do not receive sufficient lubrication. More specifically, in the conventional off-axis (lay-shaft) structure, the differential gear is positioned close to the cover, and the helical angle is set to an angle that pumps oil up to the cover. Consequently, the lubricating oil flows directly along the inner surface of the cover housing, and since there are no additional ribs, the oil flow is not altered. As a result, lubricating oil is not delivered to the bearings located on the middle housing side. Furthermore, the inner surface of the cover housing is also shaped like a gentle ellipse, causing the lubricating oil to flow around the inner surface of the cover housing without resistance and return to the oil reservoir at the bottom. Consequently, there was a problem in that lubricating oil was not delivered to the bearings and gears mounted on the center side of the cover housing. FIG. 1 is a partial cross-sectional view illustrating a housing assembly with improved oil churning function according to the present invention. FIG. 2 is a plan view illustrating the inner surface of the cover housing of the present invention. FIG. 3 is a partial plan view illustrating the inner surface of the cover housing of the present invention. FIG. 4 is a plan view showing the inner surface of the middle housing of the present invention. FIG. 5 is a partial plan view showing the inner surface of the middle housing of the present invention. Hereinafter, the technical concept of the present invention will be explained in more detail using the attached drawings. Prior to this, terms or words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention, they are interpreted in a meaning and concept consistent with the technical concept of the present invention, and only a housing assembly (1000) with improved oil churning function is provided. Hereinafter, with reference to FIG. 1, the basic configuration of the housing assembly (1000) with improved oil churning function of the present invention will be described. The housing assembly (1000) with improved oil churning function according to the present invention performs the role of supporting each gear by connecting multiple gears of an off-axis (lay-shaft) type vehicle reduction gear, and may include a cover housing (100) and a middle housing (200). Gears included in the off-axis (lay-shaft) type vehicle reduction gear are connected to the cover housing (100) and the middle housing (200), respectively, and their positions can be supported. The cover housing (100) and the middle housing (200) are provided so that one side of each faces the other, thereby connecting the internal spaces. In particular, the lower end of the middle housing (200) is connected to a sump space, allowing lubricating oil to be supplied into the space formed by the cover housing (100) and the middle housing (200). In addition, the housing assembly (1000) with improved oil churning function of the present invention may include an oil guide portion (300) formed by machining the cover housing (100) and the middle housing (200) to guide the flow direction of the churned oil. By including the oil guide portion (300), the lubricating oil can be uniformly distributed within the space formed by the cover housing (100) and the middle housing (200), that is, within the space equipped with the gears and bearings of the reduction gear, rather than flowing only on the inner surface of either the cover housing (100) or the middle housing (200), and accordingly, the lubrication performance and cooling performance of the reduction gear can be maximized. Hereinafter, the detailed shape of the oil guide portion (300) applied to the cover housing (100) of the present invention will be described in more detail with reference to FIGS. 2 and 3. As illustrated in FIG. 2, a differential gear, a first counter gear, and a parking gear (P)