Housing arrangement with improved oil swirling function

Abstract

Housing arrangement with an improved oil swirl function, coupled to a plurality of gears of a vehicle reduction gearbox, wherein the housing arrangement comprises: a cover housing with a surface coupled to a differential gear and a first reduction gear; a central housing with a surface coupled to an input gear and a second intermediate gear coupled to the first intermediate gear, one surface being designed to face one surface of the cover housing, and a lower end being connected to a sump space; and an oil guide element that is machined and arranged on the cover housing and the middle housing to guide the flow direction of swirling oil.

Description

Background of the Revelation; Area of ​​the Revelation

[0001] The disclosure relates to a housing arrangement used in an off-axis (countershaft) reduction gearbox. Description of the state of the art

[0002] An off-axis (countershaft) reduction gear is a type of reduction gear used in electric motors and is driven by the largest differential gear, which scoops up oil and supplies the oil to the bearings and gears, rather than spot-spraying the oil onto each bearing and gear, which would lead to solid friction, and a primary area of ​​oil supply varies depending on an axial position of a differential gear and an angle of a helical gear.

[0003] However, in conventional off-axis (countershaft) reduction gears, because the axial position and helix angle of the differential gear are designed to favor lubrication only within a single cover, a problem arises: the main oil flow is formed along an inner surface of the cover, resulting in insufficient lubrication of bearings located in a central housing. More precisely, in the conventional off-axis (countershaft) design, because the differential gear is positioned close to the cover and the helix angle is set to pump oil towards the cover, lubricating oil flows directly along an inner surface of the cover housing, and the oil flow is not altered because no additional rib is provided. Consequently, lubricating oil is not transferred to the bearings located in the central housing.Furthermore, since the inner surface of the cover housing has a slightly oval shape, lubricating oil circulates without resistance along the inner surface of the cover housing and returns to an oil reservoir at the bottom, and therefore a problem is that the lubricating oil is not transferred to bearings and gears that are mounted in a middle section of the cover housing. State of the art documents

[0004] (Patent document 1) Korean published patent no. 10-2021-0107406 “GEAR SYSTEM” (gear system) Summary of Revelation

[0005] The present disclosure was made in an effort to solve the above-mentioned problems and aims to provide a housing arrangement with an improved oil swirl function which can improve lubrication and cooling performance by improving the shapes of an outer surface and an inner surface of a cover housing and a middle housing, so that lubricating oil is supplied uniformly to each bearing and gear during oil swirl.

[0006] According to one embodiment of the present disclosure, a housing arrangement with an improved oil swirl function is provided, to which a plurality of gears of a vehicle reduction gear is coupled, comprising: a cover housing, one surface of which is coupled to a differential gear and a first intermediate gear, a middle housing, one surface of which is coupled to an input gear and a second intermediate gear, which is coupled to the first intermediate gear, wherein one surface is provided to face one surface of the cover housing, and a lower end is connected to a sump space, and an oil guide element, which is machined and formed on the cover housing and on the middle housing to guide a flow direction of swirled oil.

[0007] Furthermore, the oil guide part may include a guide groove formed in an outer edge of the cover housing with a predetermined depth.

[0008] Furthermore, the guide groove can be located on an edge of the cover housing that corresponds to the top of the first intermediate gear.

[0009] Furthermore, the guide groove can be designed in a streamlined shape with a curvature greater than or equal to a predetermined value.

[0010] Furthermore, the oil guide part may also include a first guide rib designed to project a predetermined height from one surface of the cover housing and to extend inwards from one end of the guide groove.

[0011] Furthermore, the first guide rib can be designed so that it is inclined in a direction perpendicular to the ground at a predetermined angle.

[0012] Furthermore, the oil guide part may include a second guide rib designed to project from one surface of the middle housing and positioned at a location corresponding to the first guide rib, with the second guide rib in contact with the first guide rib to allow the transfer of oil from the first guide rib to the second guide rib.

[0013] Furthermore, the oil guide part may also include a third guide rib designed to project a predetermined height from one surface of the cover housing and to extend from the other end of the guide groove to a center of the first intermediate gear.

[0014] Furthermore, the middle housing may have a gear housing part which is concave at a location corresponding to the differential gear, and the oil guide part may further comprise a fourth guide rib which is designed to project a predetermined height from an inner surface of the gear housing part and is designed to extend from an edge of the inner surface towards a center of the differential gear.

[0015] Furthermore, the fourth guide rib can be designed to be inclined at a predetermined angle in a direction perpendicular to the ground. Brief description of the drawings Fig. Figure 1 is a partial cross-sectional view showing a housing arrangement with an improved oil turbulence function of the present disclosure. Fig. Figure 2 is a top view showing an inner surface of a cover housing of the present disclosure. Fig. Figure 3 is a partial top view showing the inner surface of the cover housing of the present disclosure. Fig. Figure 4 is a top view showing an inner surface of a middle casing of the present disclosure. Fig. Figure 5 is a partial top view showing the inner surface of the middle casing of the present disclosure. Detailed description of the revelation

[0016] The technical concept of the present disclosure is described in more detail below with reference to the accompanying drawings. Before the description, terms or words used in the present description and the claims should not be interpreted as being limited to their usual or lexical meanings, but rather as meanings and concepts that correspond to the technical idea of ​​the present disclosure, based on the principle that the inventor can adequately define the concepts of the terms in order to describe his own disclosure in the best possible way.

[0017] Below is a basic configuration of a housing arrangement 1000 with an improved oil turbulence function of the present disclosure with reference to Fig. 1 described.

[0018] The housing arrangement 1000 with an improved oil turbulence function of the present disclosure can serve to support several gears of an off-axis (countershaft) vehicle reduction gearbox, each gear being coupled to it, and comprises a cover housing 100 and a central housing 200. The cover housing 100 and the central housing 200 can each be coupled to gears contained in the off-axis (countershaft) vehicle reduction gearbox, so that their positions can be supported. The cover housing 100 and the central housing 200 can be designed such that their surfaces face each other to form a space therein. In particular, the central housing 200 can have a lower end that communicates with a sump to allow lubricating oil to be supplied into the space formed by the cover housing 100 and the central housing 200.

[0019] Furthermore, the housing arrangement 1000 with an improved oil swirl function of the present disclosure can include an oil guide element 300, which is machined and formed on the cover housing 100 and the middle housing 200 to guide the flow direction of the swirled oil. By including the oil guide element 300, the lubricating oil not only flows along an inner surface of any one of the cover housing 100 or the middle housing 200, but is also distributed evenly within the space formed by the cover housing 100 and the middle housing 200, that is, a space in which the gears and bearings of the reduction gear are provided, thereby maximizing the lubrication and cooling performance of the reduction gear.

[0020] The specific shape of the oil guide part 300, which is applied to the cover housing 100 of the present disclosure, is described below with reference to Fig. 2 and Fig. 3 described in more detail.

[0021] As in Fig. As shown in Figure 2, the cover housing 100 can have a surface that is coupled to a differential gear, a first reduction gear, and a parking gear P. More precisely, the cover housing 100 can have a differential gear coupling part 110, a first reduction gear coupling part 120, and a parking gear coupling part 130, which are formed on a surface to which a differential gear, a first reduction gear, and a parking gear P, and their associated bearings, are each coupled.

[0022] In this case, the oil guide element 300 can include a guide groove 310 formed to a predetermined depth in an outer edge of the cover housing 100. By including the guide groove 310, an inner surface of the cover housing 100 can be formed in a distorted shape instead of an oval shape, thus enabling lubricating and cooling oil to be supplied to the cover housing 100. Furthermore, the oil guide element 300 can also include a first guide rib 320 formed such that it projects a predetermined height from a surface of the cover housing 100 and extends inward from one end of the guide groove 310. By including the first guide rib 320, the flow of oil flowing along an inner edge of the cover housing 100 can be interrupted once and then supplied along the first guide rib 320 to the gears and bearings inside the cover housing 100.

[0023] More precisely, as in Fig. As shown in Figure 3, the guide groove 310 is formed on the edge of the cover housing 100, corresponding to the top surface of a first intermediate gear. Accordingly, lubricating oil can flow to the first intermediate gear located on the central section of the cover housing 100 and can also be transferred to the differential gear and the parking gear P adjacent to the first intermediate gear. The guide groove 310 can be formed in a streamlined shape with a curvature greater than or equal to a predetermined value to guide the lubricating oil naturally inwards from the cover housing 100.

[0024] Furthermore, the first guide rib 320 can be configured to be inclined at a predetermined angle in a direction perpendicular to the ground. More precisely, the first guide rib 320 can be configured in a direction approximately 1 to 2 o'clock with respect to its installation position in the vehicle. Accordingly, some oil can flow into an inner ring of the bearing that supports the gear to perform a lubricating function, and the majority of the oil can flow through the differential gear coupling part 110, the first countershaft gear coupling part 120, and the parking gear coupling part 130, into which the bearing is pressed, to perform a cooling function.

[0025] Furthermore, the oil guide element 300 can also include a third guide rib 340, which is configured to project a predetermined height from a surface of the cover housing 100 and to extend from the other end of the guide groove 310 toward the center of the first intermediate gear. By including the third guide rib 340, the lubricating and cooling oil can be concentrated more effectively on the inner, i.e., the central, area of ​​the cover housing 100. Additionally, the third guide rib 340 can be formed at a lower height than the first guide rib 320 and be inclined at a predetermined angle perpendicular to the ground, or it can be inclined in a direction opposite to that of the first guide rib 320.More precisely, the third guide rib 340 can be oriented in a direction from approximately 9 to 11 o'clock with respect to the installation position in the vehicle. Accordingly, some oil can flow into an inner ring of the bearing that supports the gear to perform a lubrication function, and the majority of the oil can flow through the differential gear coupling part 110, the first countershaft gear coupling part 120, and the parking gear coupling part 130, into which the bearing is pressed, to perform a cooling function.

[0026] Furthermore, if both the first guide rib 320 and the third guide rib 340 are formed, the lubricating and cooling oil can be sprayed from both sides of the first reduction gear along the first guide rib 320 and the third guide rib 340, thereby cooling the first reduction gear more effectively and ensuring that the lubricating and cooling oil is smoothly supplied to the differential gear and the parking gear P, which are provided on both sides of the first reduction gear.

[0027] The specific shape of the oil guide part 300, which is applied to the central housing 200 of the present disclosure, is described below with reference to Fig. 4 and Fig. 5 described in more detail.

[0028] As in Fig. As shown in Figure 4, the central housing 200 can have a surface coupled to an input gear I and a second reduction gear connected to the first reduction gear, with one surface facing a surface of the cover housing and a lower end communicating with the sump. The central housing 200 can have a surface formed with a gear housing part 210, which is concave at a location corresponding to the differential gear and accommodates the differential gear, and a surface formed with a second reduction gear coupling part 220 and an input gear coupling part 230, to which the second reduction gear and the input gear I and their associated bearings are respectively coupled.

[0029] In this case, the oil guide element 300 can include a second guide rib 330, which projects from a surface of the central housing 200 and is formed at a location corresponding to the first guide rib 320 and on the input gear coupling element 230. In this case, the projecting surfaces of the first guide rib 320 and the second guide rib 330 can be in contact with each other. Accordingly, the lubricating and cooling oil flowing along the inner surface of the cover housing 100 can flow through the first guide rib 320 to the inner surfaces of the second guide rib 330 and the central housing 200. Accordingly, the lubricating and cooling oil can also be supplied to the gears and bearings coupled to the central housing 200.

[0030] Furthermore, the central housing 200 preferably comprises the transmission housing part 210, which is concave at a location corresponding to the differential gear, and the oil guide part 300 preferably further comprises a fourth guide rib 350, which is configured to project a predetermined height from an inner surface of the transmission housing part 210 to a predetermined height and is configured to extend from an edge of the inner surface towards the center of the differential gear. By forming the fourth guide rib 350 in the transmission housing part 210, it is possible to prevent oil splashed up by the differential gear in the sump from falling directly into the sump by blocking it, thereby improving the lubrication and cooling performance for other gears and bearings.

[0031] Additionally, the second guide rib 330 or the fourth guide rib 350 is preferably designed to be inclined at a predetermined angle in the direction perpendicular to the ground. More precisely, the second guide rib can be designed in a direction of approximately 1 to 2 o'clock or 10 to 11 o'clock with respect to its installation position in the vehicle. Accordingly, as shown in Fig. 5 shows that some oil flows to the inner ring of the bearing that supports the differential gear to perform a lubrication function, and the majority of the oil can flow along the inner surface of the gearbox housing part 210 to perform a cooling function for the differential gear and the bearing.

[0032] According to the housing arrangement with an improved oil swirl function of the present disclosure with the above-mentioned configuration, it is possible to improve lubrication and cooling performance by improving the shapes of an outer surface and inner surface of a cover housing and a middle housing, so that lubricating oil is supplied evenly to each bearing and gear during oil swirl.

[0033] The technical concept of this disclosure should not be interpreted as being limited to the embodiments described above. Not only is the scope of application diverse, but various modifications can also be made by a person skilled in the art without deviating from the core of this disclosure as claimed in the claims. Accordingly, these improvements and modifications fall within the scope of this disclosure, provided they are obvious to a person skilled in the art. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] KR 10-2021-0107406

[0004]

Claims

[1] Housing arrangement with an improved oil swirl function coupled to a plurality of gears of a vehicle reduction gear, the housing arrangement comprising: a cover housing with a surface coupled to a differential gear and a first reduction gear; a central housing with a surface coupled to an input gear and a second intermediate gear coupled to the first intermediate gear, one surface being designed to face one surface of the cover housing, and a lower end being connected to a sump space; and an oil guide element that is machined and arranged on the cover housing and the middle housing to guide the flow direction of swirling oil. [2] Housing arrangement according to claim 1, wherein the oil guide part comprises a guide groove formed in an outer edge of the cover housing with a predetermined depth. [3] Housing arrangement according to claim 2, wherein the guide groove is arranged on an edge of the cover housing which corresponds to a top side of the first intermediate gear. [4] Housing arrangement according to claim 2 or 3, wherein the guide groove is arranged in a streamlined shape with a curvature greater than or equal to a predetermined value. [5] Housing arrangement according to one of claims 2 to 4, wherein the oil guide part further comprises a first guide rib which is designed to project a predetermined height from one surface of the cover housing and is designed to extend inwards from one end of the guide groove. [6] Housing arrangement according to claim 5, wherein the first guide rib is designed such that it is inclined in a direction perpendicular to the ground at a predetermined angle. [7] Housing arrangement according to claim 5 or 6, wherein the oil guide part comprises a second guide rib which is designed to project from one surface of the middle housing and is arranged at a location corresponding to the first guide rib, and the second guide rib is in contact with the first guide rib to enable the transfer of oil from the first guide rib to the second guide rib. [8] Housing arrangement according to one of claims 2 to 7, wherein the oil guide part further comprises a third guide rib which is designed to project a predetermined height from one surface of the cover housing and is designed to extend from the other end of the guide groove to a center of the first intermediate gear. [9] Housing arrangement according to any one of claims 1 to 8, wherein the middle housing comprises a gear housing part which is concave at a location corresponding to the differential gear, and the oil guide part further comprises a fourth guide rib which is designed to project a predetermined height from an inner surface of the gear housing part and is designed to extend from an edge of the inner surface towards a center of the differential gear. [10] Housing arrangement according to claim 9, wherein the fourth guide rib is designed such that it is inclined in a direction perpendicular to the ground at a predetermined angle.

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