Casing assembly with improved oil agitation function

Abstract

The utility model relates to the shell assembly with improved oil stirring function. The shell assembly can be applied to the off -axis (secondary shaft) type speed reducer. According to the shell assembly with improved oil stirring function of the present disclosure, the lubricating performance and cooling performance can be improved by the following means: improving the shape of the outer surface and the inner surface of the cover shell and the intermediate shell, so that the lubricating oil is uniformly supplied to each bearing and gear during oil stirring.

Description

Technical Field

[0001] This disclosure relates to a housing assembly for use in off-axis (secondary shaft) type reducers. Background Technology

[0002] Off-axis (secondary shaft) reducers are a type of reducer used in electric motors. They operate by scooping up oil with the largest differential gear and supplying it to the bearings and gears, rather than spraying oil point by point to each bearing and gear that causes solid friction. The main area of ​​oil supply varies depending on the axial position of the differential gear and the angle of the helical gear.

[0003] However, in conventional off-axis (secondary shaft) reducers, because the axial position and helix angle of the differential gear are designed to facilitate lubrication only within the cover, the following problem exists: the main oil flow forms along the inner surface of the cover, resulting in insufficient lubrication for the bearings located in the intermediate housing. More specifically, in conventional off-axis (secondary shaft) structures, because the differential gear is positioned close to the cover and the helix angle is set to pump oil to the cover, 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. Therefore, the lubricating oil is not transmitted to the bearings located in the intermediate housing. Furthermore, because the inner surface of the cover housing is a gently elliptical shape, the lubricating oil circulates unimpeded along the inner surface of the cover housing and returns to the oil reservoir at the bottom, resulting in the following problem: the lubricating oil is not transmitted to the bearings and gears mounted in the central portion of the cover housing.

[0004] Related technical documents

[0005] (Patent Document 1) Korean Patent Application Publication No. 10-2021-0107406, "Gear System" Utility Model Content

[0006] This disclosure is made to solve the above-mentioned problems and aims to provide a housing assembly with improved oil agitation function, which can improve lubrication and cooling performance by improving the shape of the outer and inner surfaces of the cover housing and the intermediate housing so that lubricating oil is evenly supplied to each bearing and gear during oil agitation.

[0007] According to one embodiment of this disclosure, a housing assembly with improved oil agitation function is provided, to which multiple gears of a vehicle reducer are connected. The housing assembly includes: a cover housing, one surface of which is connected to a differential gear and a first auxiliary gear; an intermediate housing, one surface of which is connected to an input gear and a second auxiliary gear, the second auxiliary gear being connected to the first auxiliary gear, one surface of which is configured to face a surface of the cover housing, and its lower end communicating with an oil pan space; and an oil guide portion, which is machined and formed on the cover housing and the intermediate housing for guiding the flow direction of agitated oil.

[0008] Additionally, the oil guiding portion may include a guiding groove formed to a predetermined depth in the outer edge of the cover housing.

[0009] Additionally, the guide groove may be formed on the edge of the cover housing corresponding to the upper side of the first auxiliary gear.

[0010] In addition, the guide groove can be formed into a streamlined shape with a curvature greater than or equal to a predetermined value.

[0011] Additionally, the oil guide portion may also include a first guide rib, which is formed to protrude from one surface of the cover housing at a predetermined height and to extend inward from one end of the guide groove.

[0012] In addition, the first guide rib may be formed to be inclined at a predetermined angle in a direction perpendicular to the ground.

[0013] Additionally, the oil guide portion may include a second guide rib, which is formed to protrude from one surface of the intermediate housing and is formed at a position corresponding to the first guide rib, and the second guide rib may contact the first guide rib to allow oil to be transferred from the first guide rib to the second guide rib.

[0014] Additionally, the oil guide portion may include a third guide rib, which is formed to protrude from one surface of the cover housing at a predetermined height and to extend from the other end of the guide groove toward the center of the first auxiliary gear.

[0015] Additionally, the intermediate housing may include a gearbox portion recessed at a position corresponding to the differential gear, and the oil guide portion may also include a fourth guide rib formed to protrude from the inner surface of the gearbox portion by a predetermined height and to extend from the edge of the inner surface toward the center of the differential gear.

[0016] In addition, the fourth guide rib can be formed to be inclined at a predetermined angle in a direction perpendicular to the ground. Attached Figure Description

[0017] Figure 1 This is a partial cross-sectional view showing the housing assembly with improved oil agitation function of this disclosure.

[0018] Figure 2 This is a top view showing the inner surface of the cover housing of this disclosure.

[0019] Figure 3 This is a partial top view showing the inner surface of the cover housing of this disclosure.

[0020] Figure 4 This is a top view showing the inner surface of the intermediate housing of this disclosure.

[0021] Figure 5 This is a partial top view showing the inner surface of the intermediate housing of this disclosure. Detailed Implementation

[0022] The technical spirit of this disclosure will be described in more detail below with reference to the accompanying drawings. Before the description, the terms or words used in this specification and claims should not be construed as limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical spirit of this disclosure, based on the inventor's ability to appropriately define the concepts of the terms in order to best describe his or her disclosure.

[0023] In the following text, reference will be made to Figure 1 The basic structure of the housing assembly 1000 with improved oil agitation function disclosed herein is described.

[0024] The housing assembly 1000 with improved oil agitation function disclosed herein can be used to support multiple gears in an off-axis (counter-axle) type vehicle reducer, wherein each gear is coupled to the housing assembly, and the housing assembly 1000 may include a cover housing 100 and an intermediate housing 200. The cover housing 100 and the intermediate housing 200 may each be coupled to a gear included in the off-axis (counter-axle) type vehicle reducer such that their positions can be supported. The cover housing 100 and the intermediate housing 200 may be arranged such that one surface faces each other to form a space therein. In particular, the intermediate housing 200 may have a lower end communicating with an oil pan space to allow lubricating oil to be supplied into the space formed by the cover housing 100 and the intermediate housing 200.

[0025] Furthermore, the housing assembly 1000 with improved oil agitation function disclosed herein may include an oil guide portion 300, which is machined and formed on the cover housing 100 and the intermediate housing 200 to guide the flow direction of the agitated oil. By including the oil guide portion 300, the lubricating oil not only flows along the inner surface of either the cover housing 100 or the intermediate housing 200, but is also uniformly distributed within the space formed by the cover housing 100 and the intermediate housing 200, i.e., within the space where the gears and bearings of the reducer are disposed, thereby maximizing the lubrication and cooling performance of the reducer.

[0026] In the following text, reference will be made to Figure 2 and Figure 3 The specific shape of the oil guide portion 300 applied to the cover housing 100 of this disclosure will be described in more detail.

[0027] like Figure 2 As shown, the cover housing 100 may have a surface connected to the differential gear, the first auxiliary gear, and the parking gear P. More specifically, the cover housing 100 may have a differential gear connecting portion 110, a first auxiliary gear connecting portion 120, and a parking gear connecting portion 130 formed on one surface, wherein the differential gear, the first auxiliary gear, and the parking gear P, and their associated bearings, are respectively connected to the differential gear connecting portion 110, the first auxiliary gear connecting portion 120, and the parking gear connecting portion 130.

[0028] In this configuration, the oil guide portion 300 may include a guide groove 310 formed to a predetermined depth in the outer edge of the cover housing 100. By including the guide groove 310, the inner surface of the cover housing 100 can be formed in a twisted shape instead of an ellipse, thereby allowing lubricating and cooling oil to be supplied to the cover housing 100. Additionally, the oil guide portion 300 may also include a first guide rib 320, which is formed to protrude from one surface of the cover housing 100 by a predetermined height and extends inward from one end of the guide groove 310. By including the first guide rib 320, the flow of oil along the inner edge of the cover housing 100 can be interrupted once, and then supplied along the first guide rib 320 to gears and bearings inside the cover housing 100.

[0029] More specifically, such as Figure 3 As shown, the guide groove 310 can be formed on the edge of the cover housing 100 corresponding to the upper side of the first auxiliary gear. Therefore, lubricating oil can flow to the first auxiliary gear located in the central portion of the cover housing 100, and can also be transmitted to the differential gear and parking gear P adjacent to the first auxiliary gear. The guide groove 310 can be formed in a streamlined shape with a curvature greater than or equal to a predetermined value to naturally guide the lubricating oil inward from the cover housing 100.

[0030] Furthermore, the first guide rib 320 can be formed to be inclined at a predetermined angle in a direction perpendicular to the ground. More specifically, the first guide rib 320 can be formed in a direction approximately from 1 o'clock to 2 o'clock relative to its position / phase in the vehicle. Therefore, some oil can flow into the inner ring of the bearing supporting the gear to perform a lubrication function, and most of the oil can flow through the differential gear coupling 110, the first auxiliary gear coupling 120, and the parking gear coupling 130, which are press-fitted with bearings, to perform a cooling function.

[0031] Furthermore, the oil guide portion 300 may also include a third guide rib 340, which is formed to protrude from one surface of the cover housing 100 at a predetermined height and to extend from the other end of the guide groove 310 toward the center of the first auxiliary gear. By including the third guide rib 340, lubricating and cooling oil can be more effectively concentrated in the internal region of the cover housing 100, i.e., the central region. Additionally, the third guide rib 340 may be formed at a lower height than the first guide rib 320 and inclined at a predetermined angle in a direction perpendicular to the ground, but it may also be formed inclined in the opposite direction to the first guide rib 320. More specifically, the third guide rib 340 may be formed in a direction approximately from 9 o'clock to 11 o'clock relative to its orientation / posture in the vehicle. Therefore, some oil can flow into the inner ring of the bearing supporting the gear to perform a lubrication function, and most of the oil can flow through the differential gear connection portion 110, the first auxiliary gear connection portion 120, and the parking gear connection portion 130, which are press-fitted with bearings, to perform a cooling function.

[0032] In addition, when both the first guide rib 320 and the third guide rib 340 are formed, lubricating and cooling oil can be sprayed from both sides of the first auxiliary gear along the first guide rib 320 and the third guide rib 340, thereby cooling the first auxiliary gear more effectively and ensuring that the lubricating and cooling oil is smoothly supplied to the differential gear and parking gear P located on both sides of the first auxiliary gear.

[0033] In the following text, reference will be made to Figure 4 and Figure 5 The specific shape of the oil guide portion 300 applied to the intermediate housing 200 of this disclosure will be described in more detail.

[0034] like Figure 4As shown, the intermediate housing 200 may have: a surface connected to the input gear I and the second auxiliary gear, the second auxiliary gear being connected to the first auxiliary gear; a surface facing the cover housing; and a lower end communicating with the oil pan space. The intermediate housing 200 may have: a surface forming a gearbox portion 210, the gearbox portion 210 being recessed at a position corresponding to the differential gear and accommodating the differential gear; and a surface forming a second auxiliary gear connecting portion 220 and an input gear connecting portion 230, the second auxiliary gear and the input gear I, as well as associated bearings, being connected to the second auxiliary gear connecting portion 220 and the input gear connecting portion 230, respectively.

[0035] In this configuration, the oil guide portion 300 may include a second guide rib 330, which is formed to protrude from one surface of the intermediate housing 200 and is located at a position corresponding to the first guide rib 320 and at the input gear coupling portion 230. In this configuration, the protruding surfaces of the first guide rib 320 and the second guide rib 330 can contact each other. Therefore, lubricating and cooling oil flowing along the inner surface of the cover housing 100 can flow through the first guide rib 320 to the second guide rib 330 and the inner surface of the intermediate housing 200. Thus, lubricating and cooling oil can also be supplied to the gears and bearings connected to the intermediate housing 200.

[0036] Furthermore, preferably, the intermediate housing 200 includes a gearbox portion 210 recessed at a position corresponding to the differential gear, and preferably, the oil guide portion 300 further includes a fourth guide rib 350, which is formed to protrude from the inner surface of the gearbox portion 210 by a predetermined height and extends from the edge of the inner surface toward the center of the differential gear. By forming the fourth guide rib 350 in the gearbox portion 210, the oil agitated by the differential gear in the oil pan space can be blocked by the fourth guide rib 350 and prevented from falling directly into the oil pan space, thereby improving the lubrication and cooling performance for other gears and bearings.

[0037] Additionally, preferably, the second guide rib 330 or the fourth guide rib 350 is formed to be inclined at a predetermined angle in a direction perpendicular to the ground. More specifically, the second guide rib may be formed in a direction approximately 1 o'clock to 2 o'clock or 10 o'clock to 11 o'clock relative to its orientation / posture in the vehicle. Thus, as Figure 5 As shown, some oil can flow to the inner ring of the bearing supporting the differential gear to perform a lubrication function, and most of the oil can flow along the inner surface of the gearbox section 210 to perform a cooling function for the differential gear and bearing.

[0038] According to the housing assembly of the present disclosure with improved oil agitation function having the above-described structure, lubrication and cooling performance can be improved by improving the shape of the outer and inner surfaces of the cover housing and the intermediate housing so that lubricating oil is evenly supplied to each bearing and gear during oil agitation.

[0039] The technical spirit of this disclosure should not be construed as limited to the embodiments described above. Not only are its applications diverse, but those skilled in the art can make various modifications without departing from the spirit of this disclosure as claimed. Therefore, any improvements and variations that are obvious to those skilled in the art fall within the scope of this disclosure.

Claims

1. A housing assembly with improved oil agitation function, wherein a plurality of gears of a vehicle reducer are connected to the housing assembly, characterized in that, The housing assembly includes: A cover housing, the cover housing including a surface coupled to the differential gear and the first auxiliary gear; An intermediate housing, the intermediate housing including a surface coupled to an input gear and a second auxiliary gear, the second auxiliary gear being coupled to a first auxiliary gear, wherein the one surface of the intermediate housing is configured to face the one surface of the cover housing, and its lower end communicates with the oil pan space; and An oil guiding section is machined and disposed on the cover housing and the intermediate housing to guide the flow direction of the agitated oil.

2. The housing assembly with improved oil agitation function according to claim 1, characterized in that, The oil guiding portion includes a guide groove formed to a predetermined depth in the outer edge of the cover housing.

3. The housing assembly with improved oil agitation function according to claim 2, characterized in that, The guide groove is disposed on the edge of the cover housing corresponding to the upper side of the first auxiliary gear.

4. The housing assembly with improved oil agitation function according to claim 2, characterized in that, The guide groove is configured with a streamlined shape with a curvature greater than or equal to a predetermined value.

5. The housing assembly with improved oil agitation function according to claim 2, characterized in that, The oil guide portion further includes a first guide rib, which is formed to protrude from one surface of the cover housing at a predetermined height and to extend inward from one end of the guide groove.

6. The housing assembly with improved oil agitation function according to claim 5, characterized in that, The first guide rib is formed to be inclined at a predetermined angle in a direction perpendicular to the ground.

7. The housing assembly with improved oil agitation function according to claim 5, characterized in that, The oil guide portion includes a second guide rib, which is formed to protrude from one surface of the intermediate housing and is positioned corresponding to the first guide rib. The second guide rib contacts the first guide rib to allow oil to be transferred from the first guide rib to the second guide rib.

8. The housing assembly with improved oil agitation function according to claim 2, characterized in that, The oil guide portion further includes a third guide rib, which is formed to protrude from one surface of the cover housing at a predetermined height and to extend from the other end of the guide groove toward the center of the first auxiliary gear.

9. The housing assembly with improved oil agitation function according to claim 1, characterized in that, The intermediate housing includes a gearbox portion that is recessed at a position corresponding to the differential gear, and The oil guide portion further includes a fourth guide rib, which is formed to protrude from the inner surface of the gearbox portion at a predetermined height and to extend from the edge of the inner surface toward the center of the differential gear.

10. The housing assembly with improved oil agitation function according to claim 9, characterized in that, The fourth guide rib is formed to be inclined at a predetermined angle in a direction perpendicular to the ground.

Images