KR102597215B1 - Hybrid driving system - Google Patents

Abstract

A hybrid drive system according to the present invention includes a motor/generator, a transmission located adjacent to a first side of the motor/generator, and an engine located adjacent to a second side of the motor/generator, Inside the motor/generator, it extends in a direction from the first side to the second side, and oil flows in from the oil pump. An oil passage extending along the extension direction is formed inside the motor/generator, and the oil passage is formed at one end of the motor/generator. A main shaft connected to a passage and including an outlet hole through which the oil flows out, extends in the same direction as the main shaft inside the motor/generator, and has an extension direction inside so that one end of the main shaft is inserted. An input shaft in which a hollow portion is formed along the main shaft, and a plurality of discharge holes through which oil flowing in from the discharge hole is discharged are formed on the outer surface of the portion where the one end of the main shaft is inserted, and a predetermined diameter inside the motor/generator. A housing that has a cylindrical shape and has a hollow interior, through which the input shaft penetrates, and includes a central portion with an opening groove formed on the inner side through which oil flowing in from the discharge holes passes, and the interior of the motor/generator. It has a hollow shape so that the housing can be inserted and includes a sleeve that guides oil flowing in from the opening groove to move to the second side through a plurality of through holes.

Description

Hybrid driving system {HYBRID DRIVING SYSTEM}

The present invention relates to a hybrid drive system, and more specifically, to a hybrid drive system that can three-dimensionally cool the interior of a motor/generator through flying oil.

Figure 1 is a cross-sectional view of a motor/generator generally equipped with an oil cooling structure using ATF (transmission oil), showing the oil cooling path.

Referring to FIG. 1, in order to cool the coil 70, which is generally the main heat source of the motor/generator, oil supplied through the through passage of the input shaft 81 connected to the transmission passes through the engine clutch 82 and flows into the rotor sleeve. (83) It is known that the method of flowing inward and scattering to the coil 70 is the most effective for cooling the coil.

At this time, the oil flowing into the rotor sleeve 83 is discharged through the assembly gap between the rotor sleeve 83 and the retainer 84 on the transmission side 71, and is discharged through the rotor sleeve on the engine side 72. It is discharged through the through passage 85 of (83) and scatters to the coils 70 on both sides.

Figure 2 is an image showing the results of visualizing the behavior of oil flying from the rotor sleeve of Figure 1 through flow analysis.

When the oil sprays from the rotor sleeve 83, it is ideal for coil cooling that it sprays evenly on both the transmission side 71 and the engine side 72 of the coil 70, but conventionally, the oil sprays on the transmission side 70 of the coil 70. The amount of oil scattered on the (71) and engine side (72) is imbalanced at a ratio of approximately 6:1.

The reason is that between each spline where the rotor sleeve 83 and the retainer 84 are assembled on the transmission side 71, about 22 to 36 gaps through which oil can leak are formed in the circumferential direction of the spline, making it easy for oil to leak. On the other hand, on the engine side (72), oil can only flow through about 6 to 8 through passages (85) formed in the circumferential direction of the rotor sleeve (83) in consideration of processing cost and strength reduction. In terms of the cross-sectional area of oil discharge, this is an unfavorable condition compared to the transmission side.

Therefore, there is a need to develop technology to solve the imbalance of oil sprayed on the transmission coil and the engine coil while minimizing changes in the oil cooling structure.

One aspect of the present invention provides a hybrid drive system capable of supplying the same amount of oil to each side adjacent to the transmission and the side adjacent to the engine inside the motor/generator.

A hybrid drive system according to the spirit of the present invention is a hybrid drive system including a motor/generator, a transmission located adjacent to the first side of the motor/generator, and an engine located adjacent to the second side of the motor/generator. , Inside the motor/generator, it extends in a direction from the first side to the second side, and oil flows in from the oil pump. An oil passage extending along the extension direction is formed inside, and at one end. A main shaft connected to the oil passage and including an outlet hole through which the oil flows out, extending from the inside of the motor/generator in the same direction as the main shaft, extending inside so that one end of the main shaft is inserted. An input shaft in which a hollow portion is formed along the direction, and a plurality of discharge holes through which oil flowing in from the discharge hole is discharged is formed on the outer surface of the portion where the one end of the main shaft is inserted, inside the motor/generator. A housing having a cylindrical shape with a predetermined diameter and a hollow interior through which the input shaft penetrates, and including a central portion having an opening groove through which oil flowing in from the discharge holes passes through the housing and the motor/generator. It has a hollow shape so that the housing can be inserted into the inside of the sleeve, and includes a sleeve that guides oil flowing in from the opening groove to move to the second side through a plurality of through holes.

A moving hole is formed in a portion of the main shaft that is not inserted into the input shaft, branching from the oil passage and extending in a direction toward the engine clutch, and the oil passing through the moving hole moves toward the engine clutch. It can be moved to the first side.

The outlet hole may be formed to be larger in size than the movement hole.

The plurality of discharge holes may be formed in a portion adjacent to the discharge hole on the outer surface of the input shaft.

The plurality of discharge holes may be arranged to be spaced apart from each other by a predetermined distance along the circumferential direction of the outer surface of the input shaft.

The sleeve is connected to a first cover part having a hollow shape so that the housing can be inserted, a plate extending radially from the circumference of the first cover part, and a circumference of the plate, and the second cover part is connected to the circumference of the plate along the circumference of the plate. It may include a second cover part extending to cover the first cover part.

The plurality of through holes may be arranged at a predetermined distance apart from each other along the inner circumference of the first cover part.

The plurality of through holes may be formed in a portion connecting the first cover part and the plate so as to penetrate the first cover part and the plate.

The plurality of through holes may be formed in the first cover part to penetrate the first cover part.

Oil passing through the through holes may move along the plate and then be discharged to the second side along the side wall of the second cover part.

The hybrid drive system according to the present invention not only achieves uniform cooling of the engine side and transmission side inside the motor/generator, as oil is scattered in equal amounts on the transmission side and engine side inside the motor/generator. In addition, the cooling imbalance problem of the coil provided inside the motor/generator can be improved.

In other words, the cooling effect of the motor/generator can be improved by equalizing the amount of oil sprayed on the transmission side and engine side of the motor/generator by distributing the oil that had previously been excessively sprayed from the inside of the motor/generator to the transmission side to the engine side. there is.

Figure 1 is a cross-sectional view of a motor/generator generally equipped with an oil cooling structure using ATF (transmission oil), showing the oil cooling path.
Figure 2 is an image showing the results of visualizing the behavior of oil flying from the rotor sleeve of Figure 1 through flow analysis.
Figure 3 is a cross-sectional view showing a hybrid drive system according to an embodiment of the present invention.
FIG. 4 is a configuration diagram showing the main shaft of the hybrid drive system of FIG. 3.
FIG. 5 is a configuration diagram showing the input shaft of the hybrid drive system of FIG. 3.
FIG. 6 is a configuration diagram showing the housing of the hybrid drive system of FIG. 3.
FIG. 7 is a configuration diagram showing the sleeve of the hybrid drive system of FIG. 3.
FIGS. 8A and 8B are schematic diagrams showing oil flow states on the transmission side and engine side of the motor/generator in the hybrid drive system of FIG. 3, respectively.

The embodiments described in this specification and the configuration shown in the drawings are preferred embodiments of the disclosed invention, and at the time of filing this application, there may be various modifications that can replace the embodiments and drawings in this specification.

Additionally, the same reference numerals or symbols shown in each drawing of this specification represent parts or components that perform substantially the same function.

Additionally, the terms used herein are used to describe embodiments and are not intended to limit and/or limit the disclosed invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise,” “provide,” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification. It does not exclude in advance the existence or addition of other features, numbers, steps, operations, components, parts, or combinations thereof.

In addition, terms including ordinal numbers such as “first”, “second”, etc. used in this specification may be used to describe various components, but the components are not limited by the terms, and the terms It is used only for the purpose of distinguishing one component from another. For example, a first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component without departing from the scope of the present invention. The term “and/or” includes any of a plurality of related stated items or a combination of a plurality of related stated items.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings.

Figure 3 is a cross-sectional view showing a hybrid drive system according to an embodiment of the present invention. FIG. 4 is a configuration diagram showing the main shaft of the hybrid drive system of FIG. 3. FIG. 5 is a configuration diagram showing the input shaft of the hybrid drive system of FIG. 3. FIG. 6 is a configuration diagram showing the housing of the hybrid drive system of FIG. 3. FIG. 7 is a configuration diagram showing the sleeve of the hybrid drive system of FIG. 3.

The hybrid drive system 1 according to an embodiment of the present invention includes a motor/generator 10, a coil 90, a transmission (not shown), an engine (not shown), a main shaft 100, and an input shaft 200. , includes a housing 300 and a sleeve 400.

First, referring to FIG. 3, a transmission and an engine (not shown) are located on both sides of the motor/generator 10. That is, the transmission and the engine are located outside the motor/generator. In this case, the transmission is located adjacent to the first side 11 of the motor/generator 10 and the engine is located outside the motor/generator ( It is located adjacent to the second side 12 of 10).

The hybrid drive system 1 of the present invention can cool the inside of the motor/generator 10 through spattering oil, and accordingly the coil 90 provided inside the motor/generator 10 can also be cooled. You can.

At this time, when cooling the first side 11 and the second side 12 of the motor/generator 10 as described above, the coil 90 is adjacent to the first side 11. One side and the other side adjacent to the second side 12 may be cooled.

That is, in this embodiment, by scattering the same amount of oil on each of the first side 11 and the second side 12 of the motor/generator 10, the oil is inside the motor/generator 10. The one side and the other side of the coil 90, which extends from the first side 11 toward the second side 12, can be cooled evenly.

The main shaft 100 extends from the transmission in a direction toward the engine, that is, from the first side 11 to the second side 12, and may be shaped like a rod.

Oil flows into the main shaft 100 from an oil pump (not shown). For this purpose, as shown in FIG. 4, oil extends along the extension direction and forms a predetermined space inside the main shaft 100. A passage 110 is formed and connected to the oil passage 110 so that the oil flowing into the oil passage 110 can be finally moved to the first side 11 and the second side 12, respectively. A moving hole 120 and an outlet hole 130 are formed.

In this case, the moving hole 120 is formed in a portion of the main shaft 100 that is not inserted into the input shaft 200, and the oil flowing into the oil passage 110 is transferred to the engine clutch 20. In order to move in the direction (arrow direction in FIG. 1), it branches off from the oil passage 110 and extends in the direction toward the engine clutch 20. Thus, the oil passing through the moving hole 120 may move toward the engine clutch and then be discharged to the first side 11, that is, the transmission side.

In contrast, the outlet hole 130 is located at one end 150 of the main shaft 100 to move the oil flowing into the oil passage 110 to the input shaft 200, which will be described later, As will be described later, the oil passing through the outlet hole 130 is finally moved to the second side 12, that is, the engine side.

Here, the outlet hole 130 is preferably formed to be larger in size than the movement hole 120.

The input shaft 200 extends in the same direction as the main shaft 100, that is, from the first side 11 to the second side 12, and is formed on one side of the main shaft 100. The end portion 150 may be formed in a rod shape with a diameter larger than the diameter of the one end portion 150 so that the end portion 150 can be inserted.

To this end, referring to FIG. 5, a hollow part extending along the extension direction is formed inside the input shaft 200 so that the one end 150 of the main shaft 100 is inserted.

In addition, oil passing through the outlet hole 130 formed at one end 150 of the main shaft 100 flows into the input shaft 200, and the main shaft of the outer surface of the input shaft 200 A plurality of discharge holes 230 through which oil flowing in from the discharge hole 130 is discharged are formed in the portion 250 of the 100 where the one end 150 is inserted.

In this case, the discharge holes 230 are formed on the outer surface of the input shaft 200 adjacent to the outlet hole 130 so that oil passing through the outlet hole 130 can be more easily passed through the discharge hole. It can be allowed to pass through field 230.

Furthermore, the discharge holes 230 are arranged at a predetermined distance apart from each other along the circumferential direction of the outer surface of the input shaft 200, so that oil can be uniformly discharged in the outer direction of the input shaft 200. .

Meanwhile, in the hybrid drive system 1 of the present invention, as shown in FIG. 3, a pair of transmissions and engines are installed on the upper and lower sides, respectively, based on the extension direction of the main shaft 100 and the input shaft 200. As this is provided, the oil flowing into the input shaft 200 flows out to the upper and lower sides, respectively, and is discharged to each of the upper transmission and engine, and the lower transmission and engine. However, in the following, only the case where the oil moves downward, as shown by the arrow indicating the oil flow in FIG. 1, will be described. Of course, the same effect can be applied even when the oil moves upward. am.

Referring to FIG. 6, the housing 300 includes a central portion 310 having a cylindrical shape with a predetermined diameter, and the central portion 310 has a hollow structure on the inside to allow the input shaft 200 to be inserted therethrough. do. When the input shaft 200 penetrates the center 310 of the housing 300, the oil passing through the discharge holes 230 formed on the outer surface of the input shaft 200 flows into the center 310. ) is moved to the medial side of the

In this case, in order to move the oil moved to the inner surface of the center 310 to the sleeve 400, which will be described later, an opening groove 320 penetrating the inner surface is provided on one side of the inner surface of the center 310. This is formed.

Referring to FIG. 7, the sleeve 400 is shaped to cover the center 310 of the housing 300 so that oil passing through the opening groove 320 can be moved to the inner surface. Specifically, it includes a first cover part 410, a plate 420, and a second cover part 430.

The first cover part 410 has a cylindrical shape and has a hollow shape so that the center 310 of the housing 300 is inserted into the inside, and oil passing through the opening groove 320 flows into the inner surface. do. In this case, a plurality of through holes 440 penetrating the inner surface may be formed on the inner surface of the first cover part 410 so that the oil is discharged to the plate 420.

In this case, the through holes 440 may be arranged at a predetermined distance apart from each other along the inner circumference of the first cover part 410. Thus, the oil moving to the inner surface of the first cover part 410 can be uniformly moved to the upper and lower sides based on the extension direction of the input shaft 200.

Furthermore, the through holes 440 may be formed at a portion connecting the first cover part 410 and the plate 420 to penetrate the first cover part 410 and the plate 420. . That is, the through holes 440 may be formed to penetrate both the inner surface of the first cover part 410 and the connection portion between the first cover part 410 and the plate 420.

In contrast, the through holes 440, although not shown, do not penetrate the connection portion of the first cover part 410 and the plate 420, but only penetrate the inner surface of the first cover part 410. can be formed.

The plate 420 extends in the radial direction from the circumference of the first cover part 410 and may be shaped like a donut, through which oil passing through the through holes 440 may flow.

The second cover portion 430 is connected to the peripheral portion of the plate 420 and may be extended to cover the first cover portion 410 along the peripheral portion of the plate 420. The oil flowing into (420) can move along the side wall (431) and be discharged to the engine side.

In other words, as shown in the direction of the arrow in FIG. 1, the oil that has passed through the opening groove 320 moves to the inner surface of the first cover part 410 and passes through the plurality of through holes 440, and the oil passes through the plate. After moving along 420, it may be discharged to the second side 12 along the side wall 431 of the second cover part 430.

As described above, the sleeve 400 may serve to guide oil that has passed through the opening groove 320 of the center 310 of the housing 300 to the engine side.

FIGS. 8A and 8B are schematic diagrams showing oil flow states on the transmission side and engine side of the motor/generator in the hybrid drive system of FIG. 3, respectively.

Referring to FIG. 8A, as described above, the oil moving toward the engine clutch 20 through the moving hole 120 moves along the engine clutch 20 as shown by an arrow and then moves into the sleeve ( It can be discharged to the transmission side through the gap between 400) and retainer 40.

Referring to FIG. 8B, the oil passing through the discharge holes 230, which is not shown in the drawing, passes through the opening groove 320 of the housing 300 and then flows into the sleeve 400 as shown by an arrow. ) passes through the through holes 440 formed on the inner surface of the first cover part 410 and moves to the side wall of the second cover part 430 along the plate 420 to be discharged to the engine side. .

Meanwhile, the present applicant conducted an experiment to verify the cooling performance of the motor/generator of the hybrid drive system of the present invention, and [Table 1] shows the flow analysis results according to the experiment.

division Conventional 1 Conventional 2 this invention Engine side flow rate (lpm) 0.09 0.21 0.34 Transmission side flow rate (lpm) 0.61 0.49 0.35 flow rate
(Engine side: Transmission side) 1:6.8 1:2.3 1:1

Referring to [Table 1], the flow rate ratio of the engine side and transmission side to the spraying oil of the conventional hybrid drive system 1 is 1:6.8, and the flow rate ratio of the engine side and the transmission side to the sprayed oil of the conventional hybrid drive system 2 is 1:6.8. While the flow rate ratio on the transmission side was 1:2.3, the flow rate ratio on the engine side and transmission side to the oil splashed in the hybrid drive system of the present invention was 1:1, which is the amount of oil sprayed on the transmission side and the engine side. This can be confirmed to be equal, and it can be seen that the cooling imbalance problem between the engine side and transmission side of the motor/generator of the conventional hybrid drive system has been improved.

In other words, this shows that the cooling effect of the motor/generator can be improved by equalizing the amount of oil sprayed on the transmission side and the engine side by distributing the oil that had previously been excessively sprayed on the transmission side to the engine side.

Meanwhile, changes in the temperature of the motor/generator generally affect the control characteristics of the motor/generator by changing the strength of the magnet and the resistance of the coil, so the motor/generator is controlled by sensing the temperature of the motor/generator.

In this case, the temperature sensor for measuring the temperature of the motor/generator is generally attached only to the engine-side coil, but if the temperatures of the engine-side coil and the transmission-side coil are different, control accuracy deteriorates.

Therefore, in the hybrid drive system of the present invention, the internal cooling of the motor/generator is performed equally, so that both sides of the coil provided within the motor/generator are also cooled equally, thereby improving motor/generator control accuracy.

The scope of the present invention is not limited to the specific embodiments described above. Various other embodiments that can be modified or modified by those skilled in the art without departing from the gist of the technical idea of the present invention as specified in the claims will also fall within the scope of the present invention.

1: Hybrid drive system 10: Motor/generator
90: Coil 100: Main shaft
200: input shaft 300: housing
310: Center 320: Opening groove
400: Sleeve 410: First cover part
420: Plate 430: Second cover part

Claims (10)

In a hybrid drive system including a motor/generator, a transmission located adjacent to a first side of the motor/generator, and an engine located adjacent to a second side of the motor/generator,
Inside the motor/generator, it extends in a direction from the first side to the second side, and oil flows in from the oil pump. An oil passage extending along the extension direction is formed inside the motor/generator, and the oil passage is formed at one end of the motor/generator. A main shaft connected to the oil passage and including an outlet hole through which the oil flows out;
It extends in the same direction as the main shaft inside the motor/generator, and a hollow portion is formed inside along the direction of extension so that one end of the main shaft is inserted, and a portion where the one end of the main shaft is inserted. An input shaft having a plurality of discharge holes formed on the outer surface through which the oil flowing in from the discharge hole is discharged;
Inside the motor/generator, the motor/generator has a cylindrical shape with a predetermined diameter and is formed as a hollow structure through which the input shaft penetrates, and includes a central portion on the inner side of which an opening groove through which oil flowing in from the discharge holes passes is formed. housing; and
It has a hollow shape so that the housing can be inserted into the motor/generator, and includes a sleeve that guides oil flowing in from the opening groove to move to the second side through a plurality of through holes,
The sleeve is,
a first cover portion having a hollow shape to allow the housing to be inserted;
a plate extending in a radial direction from a peripheral portion of the first cover portion; and
A second cover part is connected to the circumference of the plate and extends to cover the first cover part along the circumference of the plate,
The plurality of through holes are,
A hybrid drive system characterized in that they are arranged at a predetermined distance apart from each other along the inner circumference of the first cover part. According to paragraph 1,
A moving hole is formed in a portion of the main shaft that is not inserted into the input shaft, branching from the oil passage and extending in a direction toward the engine clutch,
A hybrid drive system, characterized in that the oil passing through the moving hole moves toward the engine clutch and then moves to the first side. The method of claim 2, wherein the outlet hole is,
A hybrid drive system characterized in that the size is larger than the moving hole. The method of claim 1, wherein the plurality of discharge holes are,
A hybrid drive system, characterized in that it is formed in a portion adjacent to the outlet hole on the outer surface of the input shaft. The method of claim 4, wherein the plurality of discharge holes are,
A hybrid drive system characterized in that they are arranged at a predetermined distance apart from each other along the circumferential direction of the outer surface of the input shaft. delete delete The method of claim 1, wherein the plurality of through holes are:
A hybrid drive system characterized in that it is formed at a portion connecting the first cover portion and the plate so as to penetrate the first cover portion and the plate. The method of claim 1, wherein the plurality of through holes are:
A hybrid drive system, characterized in that the first cover part is formed to penetrate the first cover part. According to clause 8 or 9,
A hybrid drive system, characterized in that the oil passing through the through holes moves along the plate and then is discharged to the second side along the side wall of the second cover part.

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