Power transmission device for hybrid vehicle

Abstract

A power transmission device for a hybrid vehicle is disclosed. The power transmission device for a hybrid vehicle according to an embodiment of the present invention includes a motor case configured between an engine and a transmission; at least one motor connected to a crankshaft of the engine or the transmission inside the motor case; a torsional vibration damper configured between the engine and the transmission inside the motor case, an outer side of which is coupled to the at least one motor in a radial direction; and a spline hub connected to the torsional vibration damper for transmitting a driving force transmitted to the torsional vibration damper to the transmission, further including a dust catching unit provided at a position spaced apart from the torsional vibration damper in a radial direction on a flow path of a working fluid flowing from the transmission to the at least one motor through the torsional vibration damper for catching dust contained in the working fluid generated at the torsional vibration damper.

Description

Technical Field

[0001] The present invention relates to a power transmission device for a hybrid electric vehicle, and more specifically, to a power transmission device for a hybrid electric vehicle equipped with at least one, preferably more than two, motors and torsional vibration dampers, for preventing dust generated on the torsional vibration dampers from flowing into the motors and transmission. Background Technology

[0002] Environmentally friendly automotive technologies are key technologies for the future automotive industry, and automakers are making every effort to develop environmentally friendly vehicles to meet environmental and fuel efficiency regulations.

[0003] Future automotive technologies include electric vehicles (EVs), hybrid electric vehicles (HEVs), and dual-clutch transmissions (DCTs) that improve efficiency and convenience.

[0004] The hybrid electric vehicle is a vehicle that uses two or more power sources, which can be combined in various ways. It is usually a hybrid system consisting of a gasoline or diesel engine using existing fossil fuels and an electric motor / engine driven by electric power.

[0005] These hybrid electric vehicles are equipped with both an internal combustion engine and a motor, thus significantly reducing harmful gas emissions and improving fuel efficiency compared to conventional vehicles.

[0006] This type of hybrid electric vehicle requires the development of a power transmission device equipped with an engine clutch and torque converter, which can effectively transfer the rotational power of the engine and motor to the transmission to improve efficiency, maximize fuel efficiency, achieve efficient power transmission, and reduce size and parts.

[0007] Here, the power transmission device for hybrid vehicles has an automatic transmission, motor, engine and ISG (Integrated Starter & Generator) arranged in a row.

[0008] In hybrid electric vehicles that use both an engine and a motor, the motor is used to start the car initially. When the car reaches a predetermined speed, the generator, or ISG (Integrated Starter & Generator), starts the engine, thus utilizing the output of both the engine and the motor simultaneously.

[0009] Furthermore, in the initial stages when the engine is not driven, the vehicle can be electrically propelled by a motor in the power transmission system used in hybrid vehicles. And in recent years, the number of motors has increased from one to two or more.

[0010] As an example, when the power transmission device used in a hybrid vehicle is equipped with two motors, the first motor can be driven to start the engine, and the second motor can be driven to enable the vehicle to travel electrically.

[0011] However, when the power transmission device according to the prior art is running, the dust of iron powder component generated from the torsional vibration damper flows inside and diffuses in a state contained in the working fluid. Therefore, there is a problem that it adheres to the motor, causing a decrease in motor performance, resulting in motor damage and failure, and reduced durability.

[0012] In addition, there are problems such as unnecessary power loss due to reduced motor performance and overall reduced fuel efficiency.

[0013] Furthermore, when dust generated on the torsional vibration damper flows into the transmission while the working fluid is circulating, it can also cause transmission failure.

[0014] The background information provided here is intended to enhance understanding of the background of this invention and may include prior art that is not known to those skilled in the art. Summary of the Invention

[0015] Therefore, the present invention was invented to solve the above-mentioned problems. The problem to be solved by the present invention is to prevent dust generated on the torsional vibration damper from spreading into the motor and transmission of the power transmission device of the hybrid electric vehicle, which is equipped with at least one motor and a torsional vibration damper.

[0016] To achieve the aforementioned objective, a power transmission device for a hybrid electric vehicle according to an embodiment of the present invention includes: a motor housing disposed between an engine and a transmission; at least one motor connected inside the motor housing to the crankshaft of the engine or the transmission; a torsional vibration damper disposed inside the motor housing between the engine and the transmission, radially connected to the at least one motor on its outer side; and a splined hub connected to the torsional vibration damper for transmitting driving force transmitted to the torsional vibration damper to the transmission; and further includes a dust collection unit installed radially outward from the torsional vibration damper at a location on the flow path of the working fluid flowing from the transmission through the torsional vibration damper to the at least one motor, for collecting dust generated by the torsional vibration damper and contained in the working fluid.

[0017] The at least one motor may include: a first motor connected to the crankshaft of the engine inside the motor housing; and a second motor configured axially adjacent to the first motor and connected to the transmission.

[0018] The dust collection unit can be positioned between the first motor and the second motor at a location radially inward from the first motor.

[0019] The first motor can be disposed radially outside the first motor sleeve, the first motor sleeve being fixed to the rotor shaft that receives driving force from the engine through the crankshaft, and the motor can be fixed to the first motor sleeve by a first motor retainer.

[0020] The torsional vibration damper may include: at least one first spring, elastically supported on the first motor sleeve, for absorbing vibration and impact in the rotational direction; a first cover plate, fixed to the first motor sleeve and supporting the first spring; a driven plate, elastically supported by the at least one first spring, receiving driving force and connected to the splined hub; a second cover plate, fixed to the driven plate; and at least one second spring, supported on the second cover plate and arranged along the rotational direction, for absorbing vibration and impact in the rotational direction.

[0021] The torsional vibration damper is disposed between the first motor and the second motor, and the first cover plate can be connected to the first motor sleeve at a position spaced radially outward from the first spring.

[0022] The outer peripheral surface of the at least one first spring can be elastically deformably supported by a spring guide disposed between the radially inner surface of the first motor sleeve and the spring guide.

[0023] The at least one second spring can be connected to the splined hub.

[0024] The dust collection unit may include: a mounting member mounted on the first cover plate in such a way that it protrudes a predetermined portion toward the second motor in an axial direction; and a collection member mounted on the radially inner side of the mounting member between the first motor and the second motor.

[0025] The mounting member can be bent into an "L" shape and form a gap between it and the second motor to allow the working fluid to flow.

[0026] The trapping member may be formed of a magnetic material for dust adhesion generated from the at least one first spring or the at least one second spring.

[0027] The mounting component can be fixedly connected to the first cover plate.

[0028] The dust collection unit may include: a mounting portion that is bent from the first cover plate and protrudes a predetermined portion toward the second motor in an axial direction; and a collection member that is installed radially inside the mounting portion between the first motor and the second motor.

[0029] The mounting portion can be bent in a direction parallel to the axial direction and form a gap between it and the second motor to allow the working fluid to flow.

[0030] The trapping member may be formed of a magnetic material for dust adhesion generated from the at least one first spring or the at least one second spring.

[0031] The second motor can be configured on the radially outer side of the second motor sleeve and can be fixed to the second motor sleeve by a second motor retainer.

[0032] The dust collection unit may include: a mounting portion that protrudes integrally from the second motor sleeve toward the first motor in an axial direction; and a collection member that is installed on the radially inner side of the mounting portion.

[0033] The mounting portion can protrude in a direction parallel to the axial direction and form a gap between it and the torsional vibration damper to allow the working fluid to flow.

[0034] The trapping member may be formed of a magnetic material for dust adhesion generated from the at least one first spring or the at least one second spring.

[0035] The dust collection unit may include: a mounting portion that protrudes integrally from the second motor retainer toward the first motor in an axial direction; and a collection member that is mounted radially inside the mounting portion.

[0036] The mounting portion can protrude in a direction parallel to the axial direction and form a gap between it and the torsional vibration damper to allow the working fluid to flow.

[0037] The trapping member may be formed of a magnetic material for dust adhesion generated from the at least one first spring or the at least one second spring.

[0038] It may also include a clutch disposed on the second motor and selectively connecting the second motor and the torsional vibration damper.

[0039] Invention Effects

[0040] As described above, the power transmission device for a hybrid electric vehicle according to an embodiment of the present invention, in a hybrid electric vehicle equipped with at least one motor and a torsional vibration damper, minimizes the diffusion of dust generated on the torsional vibration damper into the motor and transmission, thereby preventing a decrease in motor performance and fuel efficiency.

[0041] In addition, the present invention prevents fuel efficiency from decreasing by preventing the motor from deteriorating, thereby reducing unnecessary power loss and meeting environmental and fuel efficiency regulations.

[0042] In addition, by assembling the torsional vibration damper into the motor sleeve that functions as the engine-side rotor, and using the motor as a mass, the present invention effectively absorbs vibrations generated from the engine together with the torsional vibration damper.

[0043] Furthermore, by axially arranging the spring in the torsional vibration damper, the present invention has the effect of maximizing the protection of the entire radial space of the power transmission device.

[0044] Furthermore, by minimizing the inflow of dust generated on the torsional vibration damper into the transmission in a state where it is contained in the working fluid, the present invention has the effect of preventing transmission failure due to dust inflow. Attached Figure Description

[0045] Figure 1 This is a schematic cross-sectional view showing a power transmission device for a hybrid electric vehicle according to a first embodiment of the present invention.

[0046] Figure 2 yes Figure 1 Enlarged view of section A.

[0047] Figure 3 This is a diagram illustrating the operation of a dust collection unit equipped in a power transmission device for a hybrid electric vehicle according to a first embodiment of the present invention.

[0048] Figure 4This is a schematic cross-sectional view showing a power transmission device for a hybrid electric vehicle according to a second embodiment of the present invention.

[0049] Figure 5 yes Figure 4 Enlarged view of section B.

[0050] Figure 6 This is a schematic cross-sectional view showing a power transmission device for a hybrid electric vehicle according to a third embodiment of the present invention.

[0051] Figure 7 yes Figure 6 Enlarged view of section C.

[0052] Figure 8 This is a schematic cross-sectional view showing a power transmission device for a hybrid electric vehicle according to a fourth embodiment of the present invention.

[0053] Figure 9 yes Figure 8 Enlarged view of section D. Detailed Implementation

[0054] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0055] This invention is not limited to the embodiments disclosed below, and various modifications can be made, resulting in different forms. These embodiments are provided merely to complete the disclosure of this invention and to fully explain the scope of the invention to a person skilled in the art.

[0056] Therefore, it should be understood that the present invention is not limited to the embodiments disclosed below, but includes not only the structures of embodiments that are different from or replace each other, but also all modifications, equivalents and even substitutions included in the technical concept and scope of the present invention.

[0057] It should be understood that the accompanying drawings are only for the purpose of facilitating the understanding of the embodiments disclosed in this specification, and are not intended to limit the technical concepts disclosed in this specification. Rather, they should include the concept of the invention and all modifications, equivalents, and even substitutions included within the scope of the technology.

[0058] To clearly illustrate the invention, parts unrelated to the description will be omitted, and the same or similar constituent elements will be labeled with the same reference numerals throughout the specification.

[0059] For ease of explanation, the size and thickness of each component in the figure are displayed arbitrarily. This invention is not limited to the illustrations. Furthermore, to clearly represent multiple parts and regions, the thickness will be enlarged.

[0060] The components shown in the figure may be exaggerated or reduced in size or thickness for ease of understanding, but this does not limit the scope of protection of the present invention.

[0061] The terminology used in this specification is for illustrative purposes only and is not intended to limit the invention. Where the context does not explicitly specify otherwise, singular expressions include plural expressions.

[0062] In the specification, terms such as "comprising" and "consisting of" are intended to specify the presence of features, figures, steps, actions, constituent elements, components, or combinations thereof described in the specification. That is, the terms "comprising" and "consisting of" in the specification should be understood as not excluding the existence or additional possibilities of one or more other features, figures, steps, actions, constituent elements, components, or combinations thereof.

[0063] Terms such as "first," "second," etc., which include ordinal numbers, may be used to describe various constituent elements; however, the constituent elements are not limited to these terms. These terms are used only for the purpose of distinguishing one constituent element from others.

[0064] When it is mentioned that a certain constituent element is "connected" or "connected" to other constituent elements, it can mean that it is directly connected or connected to the other constituent element. However, it should be understood that there can also be other constituent elements in between.

[0065] Conversely, when it is mentioned that a constituent element is "directly connected" or "directly connected" with other constituent elements, it should be understood that there are no other constituent elements in between.

[0066] When it is mentioned that a certain constituent element is "above" or "below" other constituent elements, it should be understood that it is not only positioned directly above the other constituent elements, but other constituent elements may also exist in the middle.

[0067] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0068] The same terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant technology, and should not be interpreted as having an ideal or overly formal meaning when not explicitly defined in this application.

[0069] For convenience, the first direction is shown in this instruction manual.

[0070] The front-to-back direction or axial direction is considered as the direction parallel to the axis of rotation. The front (front side) refers to a direction that serves as the power source, such as the direction towards the engine side, while the rear (rear side) refers to another direction, such as the direction towards the transmission side. Therefore, the front refers to the surface facing forward, and the rear refers to the surface facing backward.

[0071] The radial or radial direction refers to the direction along a straight line passing through the center of the rotation axis on a plane perpendicular to the rotation axis, either approaching or moving away from the center. The direction radially away from the center is called the centrifugal direction, and the direction approaching the center is called the sphere-centered direction.

[0072] The circumferential direction refers to the direction around the axis of rotation. The outer circumference refers to the outer edge, and the inner circumference refers to the inner edge. Therefore, the outer circumferential surface refers to the surface facing away from the axis of rotation, and the inner circumferential surface refers to the surface facing the axis of rotation.

[0073] The circumferential lateral surface refers to the surface whose normal is roughly oriented in the circumferential direction.

[0074] In addition, the terms “…unit”, “…device”, “…section”, “…component”, etc. used in the specification refer to a unit of the overall structure that performs at least one function or action.

[0075] Figure 1 This is a schematic cross-sectional view showing a power transmission device for a hybrid electric vehicle according to a first embodiment of the present invention. Figure 2 yes Figure 1 Enlarged view of section A. Figure 3 This is a diagram illustrating the operation of a dust collection unit equipped in a power transmission device for a hybrid electric vehicle according to a first embodiment of the present invention.

[0076] Figure 1 This is a half-sectional view used to illustrate the first embodiment of the present invention, showing a portion of a power transmission device for a hybrid electric vehicle according to the first embodiment of the present invention.

[0077] refer to Figure 1 According to a first embodiment of the present invention, a power transmission device for a hybrid electric vehicle is configured to selectively transmit rotational power from an engine 3 and at least one motor to a transmission 5, and is disposed between the engine 3 and the transmission 5.

[0078] Here, the power transmission device for a hybrid electric vehicle according to the first embodiment of the present invention includes: a motor housing 7, at least one motor, a torsional vibration damper 30, a splined hub 40, and a clutch 50.

[0079] Furthermore, in describing the power transmission device for a hybrid electric vehicle according to the present invention, it is used as follows: Figure 1 Taking the rotation center axis as a reference, the direction parallel to the rotation center axis (left-right direction) is called the axial direction, and the direction perpendicular to the rotation center axis (up-down direction) is called the radial direction.

[0080] In addition, in the radial direction, the direction toward the axis of rotation (downward direction) is called the radial inner side, and the direction away from the axis of rotation (upward direction) is called the radial outer side.

[0081] First, the motor housing 7 houses at least one motor, the torsional vibration damper 30, the splined hub 40, and the clutch 50, and is connected to the vehicle body (illustration omitted).

[0082] The motor housing 7 is disposed between the engine 3 and the transmission 5, and can be connected to the housings of the engine 3 and the transmission (illustration omitted).

[0083] In this embodiment, at least one motor may include a first motor 10 and a second motor 20.

[0084] First, the first motor 10 is connected to the crankshaft 3a of the engine 3 inside the motor housing 7.

[0085] Here, the first motor 10 is disposed radially outside the first motor sleeve 11 fixed to the rotor shaft 12, the rotor shaft 12 receiving driving force from the engine 3 via the crankshaft 3a. The first motor 10 can be fixed to the first motor sleeve 11 by a first motor retainer 13.

[0086] Furthermore, the second motor 20 is arranged axially adjacent to the first motor 10 inside the motor housing 7 and is connected to the input shaft (not shown) of the transmission 3.

[0087] Here, the second motor 20 is arranged radially outside the second motor sleeve 21. The second motor 20 can be fixed to the second motor sleeve 23 by the second motor retainer 23.

[0088] The first motor 10, configured as described above, can be driven to start the engine 3, and the second motor 20 can be driven to make the car move.

[0089] In this embodiment, the torsional vibration damper 30 is disposed between the first motor 10 and the second motor 20. The outer side of the torsional vibration damper 30 can be radially connected to the first motor 10.

[0090] That is, the radially outer side of the torsional vibration damper 30 can be connected to the first motor sleeve 11.

[0091] Additionally, the splined hub 40 is connected to the torsional vibration damper 30 and can transmit the driving force transmitted to the torsional vibration damper 30 to the transmission 5. The splined hub 40 can be shaft-connected to the input shaft of the transmission 5 (not shown).

[0092] Here, the torsional vibration damper 30 may include: a first spring 31, a first cover plate 32, a driven plate 33, a second cover plate 35, and a second spring 36.

[0093] First, the first spring 31 is composed of at least one, and multiple springs may be provided along the rotation direction of the torsional vibration damper 30.

[0094] The first spring 31 is elastically supported on the radial inner side of the first motor sleeve 11 and can absorb vibrations and impacts in the rotational direction.

[0095] One end of the cover plate 32 facing radially outward is fixed to the first motor sleeve 11. The first cover plate 32 is configured to surround the first spring 31 and can elastically support the first spring 31.

[0096] That is, the first cover plate 32, located radially outward from the first spring 31, can be connected to the first motor sleeve 11 by various means such as welding, bolting, or riveting.

[0097] Therefore, the first cover plate 32 can rotate integrally with the first motor sleeve 11, and the driving force of the engine 3 transmitted through the first motor sleeve 11 can be directly transmitted to the first cover plate 32.

[0098] Here, the first cover plates 32 can be configured to face each other.

[0099] That is, the driving force of the engine 3 transmitted through the rotor shaft 12 and the first motor sleeve 11 can be transmitted to the first spring 31 through the first cover plate 32. In this process, the first spring 31 can absorb vibrations and impacts in the rotational direction.

[0100] The driven plate 33 is elastically supported by the first spring 31 to receive driving force, and can be connected to the splined hub 40.

[0101] In addition, the outer peripheral surface of the first spring 31 can be elastically supported by a spring guide 34 disposed between the radial inner surface of the first motor sleeve 11.

[0102] In this embodiment, the second cover plate 35 is fixed to the driven plate 33.

[0103] The second spring 36 is composed of at least one, and may have multiple springs along the rotational direction of the torsional vibration damper 30.

[0104] That is, the second spring 36 is supported by the second cover plate 35 and is positioned in the rotational direction, and can absorb vibrations and impacts in the rotational direction. Here, the second spring 36 can be positioned radially inward compared to the first spring 31.

[0105] The second spring 36 can be connected to the spline hub 40. That is, the spline hub 40 is elastically supported by the second spring 36.

[0106] Therefore, the splined hub 40 can receive the driving force of vibration and impact in the rotational direction that has been absorbed by the second spring 36.

[0107] In addition, the power transmission device can use the first motor 10 as a mass body by assembling the torsional vibration damper 30 to the first motor sleeve 11 that functions as a rotor on the side of the engine 3.

[0108] Therefore, the power transmission device, together with the torsional vibration damper 30, can effectively absorb the vibrations generated from the engine 3.

[0109] In addition, this embodiment describes an example in which the torsional vibration damper 30 is configured in series with the first spring 31 and the second spring 36 along the axial direction, but it is not limited to this. A torsional vibration damper with one spring configured axially in the direction of rotation can also be applied.

[0110] Furthermore, the clutch 50 is connected to the second motor sleeve 21 on which the second motor 20 is mounted, and can selectively connect the second motor 20 and the torsional vibration damper 30.

[0111] Here, the clutch 50 may be composed of a multi-plate clutch including a friction plate (not shown), a friction disc, a piston, and a hub.

[0112] The power transmission device configured as described above may also include a dust collection unit 100.

[0113] like Figure 1 and Figure 2 As shown, the dust collection unit 100 is positioned radially outward from the torsional vibration damper 30 along the flow path of the working fluid flowing from the transmission 5 through the torsional vibration damper 30 between the first motor 10 and the second motor 20.

[0114] The dust collection unit 100 collects dust generated from the first spring 31 and the second spring 36 of the torsional vibration damper 30 and contained in the working fluid.

[0115] That is, the dust collection unit 100 is disposed between the first motor 10 and the second motor 20 at a position spaced radially inward from the first motor 10.

[0116] In addition, the dust includes iron powder and the like generated by the friction between the first spring 31 and the second spring 36, which absorb vibrations and impacts in the rotational direction, and each of the constituent elements when the torsional vibration damper 30 is working.

[0117] In a first embodiment of the present invention, the dust collection unit 100 may include an installation component 110 and a collection component 120.

[0118] First, the mounting member 110 is mounted on the first cover plate 32, such that it protrudes a predetermined portion toward the second motor 20 in the axial direction.

[0119] Here, the mounting component 110 can be fixedly connected to the first cover plate 31 using various connection methods such as welding, bolting, or riveting.

[0120] Additionally, the mounting member 110 can be bent into an "L" shape. A gap G can be formed between the mounting member 110 and the second motor 20 to allow the working fluid to flow.

[0121] The gap G can perform the function of allowing the working fluid circulating inside the motor housing 7 to flow smoothly from the transmission 4 through the torsional vibration damper 30 to the radially outward.

[0122] Furthermore, the trapping member 120 can be installed radially inside the mounting member 110 between the first motor 10 and the second motor 20.

[0123] Here, the trapping member 120 may be made of a magnetic material, so that dust generated from the first spring 31 or the second spring 36 adheres to it.

[0124] Reference Figure 3 This describes the operation of the dust collection unit 100 configured as described above.

[0125] Figure 3 This is a diagram illustrating the operation of a dust collection unit applied to a power transmission device for a hybrid electric vehicle according to a first embodiment of the present invention.

[0126] refer to Figure 3The working fluid flowing in from the transmission 5 passes through the torsional vibration damper 30, cooling the frictional heat generated on the torsional vibration damper 30, and then flows between the first motor 10 and the second motor 20.

[0127] Here, the dust collection unit 100 can collect dust containing iron components in the working fluid by means of the collection member 120 arranged radially outside the torsional vibration damper 30 on the flow path of the working fluid.

[0128] That is, dust contained in the working fluid is attached to and captured by the collecting member 120 as it passes through the collecting member 120. Thus, the amount of dust contained in the working fluid can be minimized.

[0129] Therefore, the dust collection unit 100 can improve the durability of the first motor 10 and the second motor 20 by minimizing dust adhesion to the first motor 10 and the second motor 20, and can prevent the performance of the first motor 10 and the second motor 20 from degrading, thereby reducing unnecessary power loss.

[0130] On the other hand, we will refer to Figure 4 and Figure 5 This invention describes a power transmission device for a hybrid electric vehicle according to a second embodiment of the present invention.

[0131] refer to Figure 4 and Figure 5 According to the second embodiment of the present invention, the power transmission device for a hybrid electric vehicle has the same structure as the first embodiment described above, except for the dust collection unit 200. Therefore, detailed descriptions of the same constituent elements as those in the first embodiment will be omitted below.

[0132] like Figure 4 and Figure 5 As shown, the dust collection unit 200 according to the second embodiment of the present invention is disposed at a position radially outward from the torsional vibration damper 30 on the flow path of the working fluid flowing from the transmission 5 through the torsional vibration damper 30 into the working fluid between the first motor 10 and the second motor 20.

[0133] The dust collection unit 200 collects dust contained in the working fluid generated by the first spring 31 and the second spring 36 of the torsional vibration damper 30.

[0134] That is, the dust collection unit 200 can be configured between the first motor 10 and the second motor 20 at a position that is radially inward from the first motor 10.

[0135] In a second embodiment of the present invention, the dust collection unit 200 may include an installation part 210 and a collection component 220.

[0136] First, the mounting portion 210 is formed by bending from the first cover plate 32, so that it protrudes a predetermined portion toward the second motor 20 in the axial direction.

[0137] Here, the mounting portion 210 can be bent from the first cover plate 32 in a direction parallel to the axial direction. That is, the mounting portion 210 is integrally formed with the first cover plate 32. The mounting portion 210 can form a gap G with the second motor 20 to allow the working fluid to flow.

[0138] The gap G can perform the function of allowing the working fluid circulating inside the motor housing 7 to flow smoothly from the transmission 4 through the torsional vibration damper 30 to the radially outward.

[0139] Furthermore, the trapping member 120 can be installed radially inside the mounting portion 210 between the first motor 10 and the second motor 20.

[0140] Here, the trapping member 120 may be made of a magnetic material, so that dust generated from the first spring 31 or the second spring 36 adheres to it.

[0141] Therefore, the working fluid flowing in from the transmission 5 passes through the torsional vibration damper 30, cools the frictional heat generated in the torsional vibration damper 30, and then flows between the first motor 10 and the second motor 20.

[0142] Here, the dust collection unit 200 collects iron-containing dust in the working fluid by means of the collection member 220 disposed radially outside the torsional vibration damper 30 on the flow path of the working fluid.

[0143] That is, dust contained in the working fluid adheres to and is captured by the collecting member 220 as it passes through it. This minimizes the amount of dust contained in the working fluid.

[0144] Therefore, the dust collection unit 200 according to the second embodiment of the present invention can improve the durability of the first motor 10 and the second motor 20 by minimizing dust adhesion to the first motor 10 and the second motor 20, and prevent the performance of the first motor 10 and the second motor 20 from deteriorating, thereby reducing unnecessary power loss.

[0145] On the other hand, we will refer to Figure 6 and Figure 7This invention describes a power transmission device for a hybrid electric vehicle according to a third embodiment of the present invention.

[0146] refer to Figure 6 and Figure 7 According to the third embodiment of the present invention, the power transmission device for a hybrid electric vehicle has the same structure as the first embodiment described above, except for the dust collection unit 300. Therefore, detailed descriptions of the same constituent elements as those in the first embodiment will be omitted below.

[0147] like Figure 6 and Figure 7 As shown, the dust collection unit 300 according to the third embodiment of the present invention is disposed at a position radially away from the torsional vibration damper 30 on the flow path of the working fluid flowing from the transmission 5 through the torsional vibration damper 30 into the working fluid between the first motor 10 and the second motor 20.

[0148] The dust collection unit 300 collects dust generated from the first spring 31 and the second spring 36 of the torsional vibration damper 30 and contained in the working fluid.

[0149] That is, the dust collection unit 300 according to the third embodiment of the present invention can be disposed between the first motor 10 and the second motor 20 at a position spaced radially inward from the first motor 10.

[0150] Here, the dust collection unit 300 may include an installation part 310 and a collection component 320.

[0151] First, the mounting part 310 is integrally formed from the second motor sleeve 21 with the first motor in the axial direction.

[0152] Here, the mounting portion 310 can protrude from the second motor sleeve 21 in a direction parallel to the axial direction. That is, the mounting portion 310 is integrally formed with the second motor sleeve 21. The mounting portion 310 can form a gap G with the torsional vibration damper 30 to allow the working fluid to flow.

[0153] The gap G can perform the function of allowing the working fluid circulating inside the motor housing 7 to flow smoothly from the transmission 4 through the torsional vibration damper 30 to the radially outward.

[0154] Furthermore, the trapping member 320 can be installed radially inside the mounting portion 310 between the first motor 10 and the second motor 20.

[0155] Here, the trapping member 320 may be made of a magnetic material, so that dust generated from the first spring 31 or the second spring 36 adheres to it.

[0156] Therefore, the working fluid flowing in from the transmission 5 passes through the torsional vibration damper 30, cools the frictional heat generated in the torsional vibration damper 30, and then flows between the first motor 10 and the second motor 20.

[0157] Here, the dust collection unit 300 collects iron-containing dust in the working fluid through the collection member 320 arranged radially outside the torsional vibration damper 30 on the flow path of the working fluid.

[0158] That is, dust contained in the working fluid adheres to and is captured by the collecting member 320 as it passes through it. This minimizes the amount of dust contained in the working fluid.

[0159] Therefore, the dust collection unit 300 according to the third embodiment of the present invention can improve the durability of the first motor 10 and the second motor 20 by minimizing dust adhesion to the first motor 10 and the second motor 20, and prevent the performance of the first motor 10 and the second motor 20 from deteriorating, thereby reducing unnecessary power loss.

[0160] On the other hand, we will refer to Figure 8 and Figure 9 This invention describes a power transmission device for a hybrid electric vehicle according to a fourth embodiment of the present invention.

[0161] refer to Figure 8 and Figure 9 According to the fourth embodiment of the present invention, the power transmission device for a hybrid electric vehicle has the same structure as the first embodiment described above, except for the dust collection unit 400. Therefore, detailed descriptions of the same constituent elements as those in the first embodiment will be omitted below.

[0162] like Figure 8 and Figure 9 As shown, the dust collection unit 400 according to the fourth embodiment of the present invention is disposed at a position radially outward from the torsional vibration damper 30 on the flow path of the working fluid flowing from the transmission 5 through the torsional vibration damper 30 into the working fluid between the first motor 10 and the second motor 20.

[0163] The dust collection unit 300 collects dust generated from the first spring 31 and the second spring 36 of the torsional vibration damper 30 and contained in the working fluid.

[0164] That is, the dust collection unit 400 according to the fourth embodiment of the present invention can be disposed between the first motor 10 and the second motor 20 at a position spaced radially inward from the first motor 10.

[0165] Here, the dust collection unit 400 may include an installation part 410 and a collection component 420.

[0166] First, the mounting portion 310 is integrally formed from the second motor retainer 23 with the first motor 10 in the axial direction.

[0167] Here, the mounting portion 410 can protrude from a position near the radially outer side of the second motor retainer 23 in a direction parallel to the axial direction. That is, the mounting portion 410 is integrally formed with the second motor retainer 23. The mounting portion 410 can form a gap G with the torsional vibration damper 30 to allow the working fluid to flow.

[0168] The gap G can perform the function of allowing the working fluid circulating inside the motor housing 7 to flow smoothly from the transmission 4 through the torsional vibration damper 30 to the radially outward.

[0169] Furthermore, the trapping member 420 can be installed radially inside the mounting portion 410 between the first motor 10 and the second motor 20.

[0170] Here, the trapping member 420 may be made of a magnetic material, so that dust generated from the first spring 31 or the second spring 36 adheres to it.

[0171] Therefore, the working fluid flowing in from the transmission 5 passes through the torsional vibration damper 30, cools the frictional heat generated in the torsional vibration damper 30, and then flows between the first motor 10 and the second motor 20.

[0172] Here, the dust collection unit 400 collects iron-containing dust in the working fluid by means of the collection member 420 disposed radially outside the torsional vibration damper 30 on the flow path of the working fluid.

[0173] That is, dust contained in the working fluid adheres to and is captured by the collecting member 420 as it passes through it. This minimizes the amount of dust contained in the working fluid.

[0174] Therefore, the dust collection unit 400 according to the fourth embodiment of the present invention can improve the durability of the first motor 10 and the second motor 20 by minimizing dust adhesion to the first motor 10 and the second motor 20, and prevent the performance of the first motor 10 and the second motor 20 from deteriorating, thereby reducing unnecessary power loss.

[0175] Therefore, according to the power transmission device for hybrid electric vehicles of the first to fourth embodiments of the present invention configured as described above, in a hybrid electric vehicle equipped with the first motor 10, the second motor 20, and the torsional vibration damper 30, the dust collection units 100, 200, 300, and 400 minimize the diffusion of dust generated in the torsional vibration damper 30 into the first motor 10 and the second motor 20 in the state of being contained in the working fluid, thereby preventing a decrease in motor performance and fuel efficiency.

[0176] In addition, the present invention prevents a decrease in fuel efficiency by preventing a decrease in the performance of the first motor 10 and the second electric motor 20, thereby reducing unnecessary power loss and meeting environmental and fuel efficiency regulations.

[0177] In addition, by assembling the torsional vibration damper 30 to the first motor sleeve 11 that functions as a rotor on the side of the engine 3, and using the first motor 10 as a mass, the present invention can effectively absorb the vibration generated from the engine 3 together with the torsional vibration damper 30.

[0178] Furthermore, by axially arranging at least one first spring 32 and a second spring 36 in the torsional vibration damper 30, the present invention can maximize the effectiveness of the entire radial space of the power transmission device.

[0179] Furthermore, by minimizing the inflow of dust generated on the torsional vibration damper 30 into the transmission 5 in a state where it is contained in the working fluid, the present invention has the effect of preventing the transmission 5 from malfunctioning due to dust inflow.

[0180] As described above, although the present invention has been illustrated with limited embodiments and drawings, the present invention is not limited thereto, and various modifications and variations can be made by those skilled in the art within the same scope of the technical spirit and claims of the present invention.

[0181] At the same time, even if the effects of the structure based on the present invention are not explicitly described or explained while illustrating the embodiments of the present invention, the predictable effects of the structure should be acknowledged.

Claims

1. A power transmission device for a hybrid electric vehicle, characterized in that, include: Motor housing, positioned between the engine and the transmission; At least one motor is connected inside the motor housing to the crankshaft of the engine or the transmission; A torsional vibration damper is disposed inside the motor housing between the engine and the transmission, and radially connected to the at least one motor on its outer side; as well as A splined hub, connected to the torsional vibration damper, is used to transmit the driving force supplied to the torsional vibration damper to the transmission. It also includes a dust collection unit, which is installed radially outward from the torsional vibration damper at a location on the flow path of the working fluid flowing from the transmission through the torsional vibration damper to the at least one motor, for collecting dust generated by the torsional vibration damper and contained in the working fluid. The at least one motor includes: a first motor connected to the crankshaft of the engine inside the motor housing; and a second motor configured axially adjacent to the first motor and connected to the transmission. The dust collection unit is disposed between the first motor and the second motor at a position that is radially inward from the first motor.

2. The power transmission device for a hybrid electric vehicle according to claim 1, characterized in that, The first motor is disposed radially outside the first motor sleeve, the first motor sleeve is fixed to the rotor shaft that receives driving force from the engine through the crankshaft, and the motor is fixed to the first motor sleeve by a first motor retainer.

3. The power transmission device for a hybrid electric vehicle according to claim 2, characterized in that, The torsional vibration damper includes: At least one first spring, elastically supported by the first motor sleeve, is used to absorb vibrations and impacts in the direction of rotation; The first cover plate is fixed to the first motor sleeve and supports the first spring; The driven plate, elastically supported by the at least one first spring, receives the driving force and is connected to the spline hub; A second cover plate, fixed to the driven plate; and At least one second spring, supported on the second cover plate and configured in the direction of rotation, is used to absorb vibrations and impacts in the direction of rotation.

4. The power transmission device for a hybrid electric vehicle according to claim 3, characterized in that, The torsional vibration damper is positioned between the first motor and the second motor. The first cover plate is connected to the first motor sleeve at a position that is radially outward from the first spring.

5. The power transmission device for a hybrid electric vehicle according to claim 3, characterized in that, The outer peripheral surface of the at least one first spring is elastically deformably supported by a spring guide disposed between the radially inner surface of the first motor sleeve and the spring guide.

6. The power transmission device for a hybrid electric vehicle according to claim 4, characterized in that, The at least one second spring is connected to the splined hub.

7. The power transmission device for a hybrid electric vehicle according to claim 3, characterized in that, The dust collection unit includes: The mounting component is mounted on the first cover plate in a manner that protrudes a predetermined portion from the second motor axially; and A trapping component is installed radially inside the mounting component between the first motor and the second motor.

8. The power transmission device for a hybrid electric vehicle according to claim 7, characterized in that, The mounting member is bent into an "L" shape, forming a gap between itself and the second motor to allow the working fluid to flow.

9. The power transmission device for a hybrid electric vehicle according to claim 7, characterized in that, The trapping member is formed of a magnetic material for dust adhesion generated from the at least one first spring or the at least one second spring.

10. The power transmission device for a hybrid electric vehicle according to claim 7, characterized in that, The mounting component is fixedly connected to the first cover plate.

11. The power transmission device for a hybrid electric vehicle according to claim 3, characterized in that, The dust collection unit includes: The mounting portion is bent from the first cover plate into a predetermined portion protruding axially toward the second motor; and The trapping component is installed radially inside the mounting portion between the first motor and the second motor.

12. The power transmission device for a hybrid electric vehicle according to claim 11, characterized in that, The mounting portion bends in a direction parallel to the axial direction and forms a gap between it and the second motor to allow the working fluid to flow.

13. The power transmission device for a hybrid electric vehicle according to claim 11, characterized in that, The trapping member is formed of a magnetic material for dust adhesion generated from the at least one first spring or the at least one second spring.

14. The power transmission device for a hybrid electric vehicle according to claim 1, characterized in that, The second motor is disposed radially outside the second motor sleeve and is fixed to the second motor sleeve by a second motor retainer.

15. The power transmission device for a hybrid electric vehicle according to claim 14, characterized in that, The dust collection unit includes: The mounting portion, axially aligned, protrudes integrally from the second motor sleeve towards the first motor; and The trapping component is installed on the radially inner side of the mounting portion.

16. The power transmission device for a hybrid electric vehicle according to claim 15, characterized in that, The mounting portion protrudes in a direction parallel to the axial direction, forming a gap between it and the torsional vibration damper to allow the working fluid to flow.

17. The power transmission device for a hybrid electric vehicle according to claim 15, characterized in that, The trapping component is formed of a magnetic material to adsorb dust.

18. The power transmission device for a hybrid electric vehicle according to claim 14, characterized in that, The dust collection unit includes: The mounting portion, axially aligned, protrudes integrally from the second motor retainer and forms a portion that supports the first motor; and The trapping component is installed on the radially inner side of the mounting portion.

19. The power transmission device for a hybrid electric vehicle according to claim 18, characterized in that, The mounting portion protrudes in a direction parallel to the axial direction, forming a gap between it and the torsional vibration damper to allow the working fluid to flow.

20. The power transmission device for a hybrid electric vehicle according to claim 18, characterized in that, The trapping component is formed of a magnetic material to adsorb dust.

21. The power transmission device for a hybrid electric vehicle according to claim 1, characterized in that, It also includes a clutch disposed on the second motor and selectively connecting the second motor and the torsional vibration damper.

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