Hybrid power transmission module

Abstract

The invention provides a hybrid power transmission module. A hybrid power transmission module equipped with a drive shaft, a rotor hub, and an engine clutch, the hybrid power transmission module comprising: a drive plate arranged on the outer peripheral surface of the engine clutch; and a torsional vibration damper which is arranged so as to be in contact with the drive plate and which is provided with a plurality of springs, the drive plate and the torsional vibration damper being arranged within the rotor hub.

Description

Technical Field

[0001] The invention relates to a power transmission device for a hybrid vehicle. Background Art

[0002] The hybrid transmission module can realize the ICE mode that transmits the power of the engine, the EV mode that transmits the power of the motor, and the HEV mode that transmits the power of the engine and the motor at the same time. In the EV mode that transmits the power of the motor, the connection with the engine must be disconnected to prevent power loss caused by engine inertia, so this is one of the core technologies of the hybrid transmission module. The hybrid transmission module equipped with a universal torque converter has a C0 clutch (or engine disconnect clutch) that can release the power of the engine and a C1 clutch (or lockup clutch) as a starting device that transmits the output of the entire system.

[0003] Figure 1 An example of the prior art is shown, in which the power of the engine is transmitted to the torque converter 130 through the drive shaft 114, the engine disconnect clutch 116, the rotor hub 110, and the front cover 132, and is again transmitted to the transmission through the lockup clutch 134, the lockup piston 136, the torsional vibration damper 138 and the driven plate 140. The hybrid module composed of the torque converter 130 and the torsional vibration damper 138 requires other components such as the driven plate 140 and the retaining plate 142 in order to constitute the damper system.

[0004] In addition, for a hybrid module using a one-way clutch as the engine disconnect clutch 116, when the clutch 116 is coupled, it is directly connected to the rotor hub 110 and the torque converter 130 having large inertia torque, so when torque is applied from the engine, a large shock is applied to the clutch 116.

[0005] In the prior art configuration, since the transmission oil ATF is difficult to supply to the engine disconnect clutch 116, wear is likely to occur between the one-way clutch and its counterpart. In one example of the prior art, a total of 4 hydraulic fluid channels are required to control the hybrid transmission module, which are 2 pressure lines for operating and releasing the C0 clutch and 2 pressure lines for operating and releasing the C1 clutch. Since an additional pressure path is required to control the hybrid transmission module, it is difficult to develop electrification of the existing transmission using a 2-path or 3-path hydraulic fluid pressure path. Summary of the invention

[0006] An object of the present invention is to provide a hybrid transmission module that can minimize the inertia torque applied when torque is applied from an engine to a one-way clutch type engine disconnect clutch (hereinafter referred to as "engine clutch").

[0007] In addition, an object of the present invention is to provide a hybrid power transmission module that can reduce the number of components required for system configuration and the axial length by integrating the functions of a rotor hub and a torsional vibration damper required for HEV module configuration.

[0008] Another object of the present invention is to provide a hybrid transmission module having a flow path capable of directly supplying ATF to an engine clutch and a torsional vibration damper connected thereto.

[0009] The problems to be solved by the present invention are not limited to the above problems, and a person skilled in the art can clearly understand other problems not mentioned from the following description.

[0010] To achieve the above object, the hybrid transmission module according to the present invention includes the following methods and any combination thereof.

[0011] A hybrid power transmission module according to an embodiment of the present invention is a hybrid power transmission module equipped with a drive shaft, a rotor hub and an engine clutch, and includes:

[0012] A drive plate arranged on an outer peripheral surface of the engine clutch; and

[0013] a torsional vibration damper arranged to contact the driving plate and having a plurality of springs,

[0014] The drive plate and the torsional vibration damper are arranged within the rotor hub.

[0015] In a hybrid transmission module according to another embodiment of the present invention, in addition to the above-mentioned embodiment, the engine clutch is configured to transmit the driving force of the engine to the drive plate when the driving force of the engine is coupled to the engine clutch.

[0016] In the hybrid transmission module of other embodiments of the present invention, in addition to the above embodiments, the drive plate is configured to transmit the driving force of the engine from the engine clutch to the torsional vibration damper when the driving force of the engine is coupled to the engine clutch.

[0017] In the hybrid transmission module according to other embodiments of the present invention, in addition to the above embodiments, the drive plate has a plurality of hooks protruding radially outward so as to transmit the driving force of the engine to the torsional vibration damper.

[0018] In addition to the above-mentioned embodiment, a hybrid transmission module according to another embodiment of the present invention further comprises a rotor hub cover, wherein the rotor hub and the rotor hub cover respectively have a plurality of locking portions for inserting the spring of the torsional vibration damper.

[0019] In the hybrid transmission module according to other embodiments of the present invention, in addition to the above embodiments, the engine clutch is a one-way clutch.

[0020] A hybrid transmission module according to another embodiment of the present invention, in addition to the above embodiment, further includes a torque converter, and the torque converter does not have a torsional vibration damper.

[0021] A hybrid transmission module according to another embodiment of the present invention, in addition to the above embodiment, further includes an oil flow path fluidly connected to the engine clutch and / or the torsional vibration damper.

[0022] In a hybrid transmission module according to another embodiment of the present invention, in addition to the above embodiment, the oil flow path includes a first oil flow path located radially inward of the engine clutch.

[0023] In a hybrid transmission module according to another embodiment of the present invention, in addition to the above embodiment, the oil flow path includes a second oil flow path located radially outward of the engine clutch.

[0024] In a hybrid transmission module according to another embodiment of the present invention, in addition to the above embodiment, the first oil flow path is formed on the drive shaft.

[0025] In a hybrid transmission module according to another embodiment of the present invention, in addition to the above embodiment, the second oil flow path is formed on the rotor hub cover or the rotor hub.

[0026] A hybrid transmission module according to another embodiment of the present invention includes: a drive shaft for transmitting the torque of the engine; a rotor hub on which the rotor of the electric motor is mounted; an engine clutch connected to the drive shaft; and a torsional vibration damper arranged between the engine clutch and the rotor hub.

[0027] In an embodiment of the present invention, the torsional vibration damper comprises a driving plate, one or more springs, and a driven plate, wherein the driven plate comprises the rotor hub.

[0028] In an embodiment of the present invention, the engine clutch comprises: a power input part for inputting power into the drive shaft; and a power output part for outputting power when the engine clutch is in operation, and the drive plate is connected to the power output part.

[0029] In an embodiment of the present invention, the engine clutch includes a one-way clutch, the power input portion includes an inner race of the one-way clutch, and the power output portion includes an outer race of the one-way clutch.

[0030] Effects of the Invention

[0031] According to the present invention, by minimizing the inertia torque applied when the torque from the engine is applied to the engine clutch, the shock applied to the related parts can be reduced.

[0032] In addition, according to the present invention, by reducing the axial length of the hybrid transmission module, it is possible to improve the installability in the hybrid vehicle.

[0033] In addition, according to the present invention, the cooling and lubrication of the engine clutch and the torsional vibration damper connected thereto can be promoted.

[0034] The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The following description can be better understood by referring to the accompanying drawings. Even in different drawings, constituent elements with the same reference numerals have similar functions, so unless necessary for understanding the present invention, they will not be repeated, and well-known constituent elements are briefly described or omitted, but should not be understood as not being included in the embodiments of the present invention.

[0036] Figure 1 A half cross-sectional view showing an example of a conventional hybrid power transmission module.

[0037] Figure 2 A half-sectional view of a hybrid power transmission module according to an embodiment of the present invention is shown.

[0038] Figure 3 FIG. 4 is an exploded perspective view of a partial structure of a hybrid power transmission module according to an embodiment of the present invention.

[0039] Figure 4 is a perspective view of a rotor hub according to an embodiment of the present invention.

[0040] Figure 5 FIG. 1 is a perspective view of a rotor hub cover according to an embodiment of the present invention.

[0041] Figure 6 The arrangement position of the rotor hub cover according to the present invention is shown.

[0042] Figure 7 A flow path of ATF according to an embodiment of the present invention is shown.

[0043] In the figure:

[0044] 10, 110: rotor hub, 12, 12', 112: rotor hub cover, 14, 114: drive shaft, 16, 116: engine clutch, 18: outer race, 19: stopper, 20: stop groove, 21: hook, 22, 138: torsional vibration damper, 23: spring, 24, 24': spring stopper, 26a, 26b, 26b': oil flow path, 28, 28': fastening part, 30, 130: torque converter, 31, 131: impeller, 32, 132: front cover, 33: turbine, 34, 134: lockup clutch, 36, 136: lockup piston, 140: driven plate, 142: fixed plate, M: motor, M1: motor stator, M2: motor rotor. DETAILED DESCRIPTION

[0045] The present invention is not limited to the embodiments disclosed below, and various changes can be applied, and can be implemented in different forms. This embodiment is only provided to make the disclosure of the present invention complete and to fully explain the scope of the invention to people with general knowledge. Therefore, it should be understood that the present invention is not limited to the embodiments disclosed below, and not only includes structures of embodiments that replace or add structures different from any of the embodiments, but also includes all changes, equivalents and even substitutes included in the technical concept and scope of the present invention.

[0046] It should be understood that the drawings are only used to facilitate the understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the drawings, but should include all changes, equivalents and even substitutes included in the concept and technical scope of the present invention. The size or thickness of the constituent elements in the drawings may be excessively enlarged or reduced for ease of understanding, etc., but the protection scope of the present invention shall not be limited thereby.

[0047] The terms used in this specification are used only to illustrate specific implementation examples or embodiments, and are not intended to limit the present invention. Then, when no other meaning is clear in the context, the singular expression includes the plural expression. In the specification, the terms "including to", "consisting of to" and the like are intended to specify the existence of the features, numbers, steps, operations, constituent elements, devices or combinations thereof recorded in the specification. That is, the terms "including to", "consisting of to" and the like in the specification should be understood as not excluding in advance the existence or additional possibility of one or more other features or numbers, steps, operations, constituent elements, devices or combinations thereof.

[0048] Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited to the terms. The terms are used only for the purpose of distinguishing one component from other components.

[0049] When a component is mentioned to be "connected", "connected" or "coupled" to other components, it may be directly connected or connected to the other components, but it should be understood that other components may exist in between. On the contrary, when a component is mentioned to be "directly connected" or "directly connected" to other components, it should be understood that other components do not exist in between.

[0050] When it is mentioned that a certain component is “on” or “under” other components, it should be understood that it is not only disposed directly above the other components but also that other components may be present in between.

[0051] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meanings as generally understood by persons having ordinary knowledge in the technical field to which the present invention belongs. The same terms defined in commonly used dictionaries should be interpreted as having the same meanings as those in the context of the relevant technology, and should not be interpreted as ideal or overly formal meanings when not clearly defined in this application.

[0052] The components of the embodiment are symmetrical with respect to the axis, and therefore, for the convenience of drawing, half of the axis is shown. In addition, for the convenience of explanation, the direction along the length direction of the axis forming the rotation center of the component is referred to as the axial direction. In other words, the front-to-back direction or the axial direction is a direction parallel to the rotation axis, and the front (front side) refers to a certain direction as a power source, such as the direction toward the power source of the engine or drive motor of a car, and the rear (rear side) refers to another direction, such as the direction toward the transmission side. Therefore, the front (front side) refers to the side of the surface facing forward, and the rear (back side) refers to the side of the surface facing backward.

[0053] The radial direction or radial direction refers to the direction approaching or moving away from the center along a straight line passing through the center of the rotation axis on a plane perpendicular to the rotation axis. The direction radially moving away from the center is called the centrifugal direction, and the direction approaching the center is called the spherical center direction.

[0054] The circumferential direction or circumferential direction refers to the direction around the rotation axis. The outer periphery refers to the outer edge, and the inner periphery refers to the inner edge. Therefore, the outer peripheral surface refers to the surface facing away from the rotation axis, and the inner peripheral surface refers to the surface facing the rotation axis. The circumferential side surface refers to the surface whose normal line is generally facing the circumferential direction.

[0055] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0056] Figure 2A longitudinal section of a hybrid power transmission device according to an embodiment of the present invention is schematically shown. Since the longitudinal section of the device is symmetrical with respect to the rotation axis, only the upper part is shown for ease of explanation.

[0057] The power transmission device of the present invention comprises: a drive shaft 14 and a Figure 2 The front cover 32 is connected to the crankshaft (not shown) of the engine on the left side and receives the driving force of the engine; the engine clutch 16 is coupled to the drive shaft 14; the front cover 32 receives the driving force of the engine transmitted through the engine clutch 16; and the rotor hub 10 transmits the driving force of the motor M composed of the stator M1 and the rotor M2 to the front cover 32. The rotor hub 10 and the front cover 32 can be connected by a fastening portion 28 such as welding. In addition, the torque converter 30 includes: an impeller 31 connected to the front cover 32 and rotated together; a worm gear 33 that transmits the driving force to the transmission connected to the impeller 31; and a lockup clutch 34 and a lockup piston 36 that directly connect the driving force of the engine or the motor to the turbine 33.

[0058] The above is a structure suitable as a hybrid transmission module for constituting a front-wheel hybrid system.

[0059] A one-way clutch OWC is applied as the engine clutch 16, and therefore, no other engine clutch control is required. The drive shaft 14 is arranged as an inner race along the inner circumference of the engine clutch 16, and the outer race 18 is arranged along the outer circumference of the engine clutch 16. A torsional vibration damper 22 is arranged on the outer circumference of the outer race 18. That is, the torsional vibration damper 22 is not arranged in the torque converter 30 as in the prior art, but is arranged in the rotor hub 10 located outside the torque converter 30. Specifically, the torsional vibration damper 22 is arranged on the radially outer side of the engine clutch 16 across the outer race 18. The damper 22 is a wet damper using transmission oil (ATF) as lubricating oil.

[0060] When viewed in the axial direction, the torsional vibration damper 22 is accommodated between the rotor hub 10 and the rotor hub cover 12. The rotor hub cover 12 may be coupled to the rotor hub 10 (see FIG. 1 ) by welding (e.g., electron beam welding, MAG welding, laser welding). Figure 2 The rotor hub 10 may also be physically connected to the rotor hub 10 by other components such as a retaining ring or a fixing plate. Figure 2 As shown, the rotor hub cover 12 can be arranged on the right side of the torsional vibration damper 22, or on the left side (mixed Figure 6 (b) and (a) are Figure 2 same location).

[0061] A plurality of springs 23 (in Figure 3In the example of the present invention, there are five springs) located in the spring retaining portion 24 protruding from the rotor hub 10 and the spring retaining portion 24' protruding from the rotor hub cover 12 located axially opposite to the rotor hub 10 with the torsional vibration damper 22 sandwiched therebetween (see Figure 4 and Figure 5 ). According to the arrangement of the shock absorber structure described above, a driven plate or a fixed plate of the shock absorber is not required, and therefore, the power transmission module becomes compact and the mountability on the hybrid vehicle is improved.

[0062] In the hybrid system, when the engine speed increases and exceeds a critical point, the driving force of the engine is applied to the one-way clutch 16. According to the structure arranged as above, the engine driving force is transmitted to the torsional vibration damper 22 through the engine clutch 16 and the outer race 18. At this time, the outer race 18 functions as a "drive plate" that transmits the driving force of the engine.

[0063] Reference Figure 2 In the present invention, when the engine driving force is engaged, the only member rigidly connected to the engine clutch 16 is the outer race 18, so when the engine driving force is applied to the engine clutch 16, the inertia applied to the engine clutch 16 is only the magnitude generated by the outer race 18. Figure 1 In the prior art structure shown, under the same circumstances, the inertia applied to the engine clutch 16 is equivalent to the sum of the magnitudes generated by the rotor hub 110, the rotor M2 of the motor, the front cover 132, the impeller 131 and other components combined therewith. Figure 1 and Figure 2 Components that apply inertia torque to the engine clutches 116 , 16 when the driving force of the engine is applied from the drive shafts 114 , 14 to the engine clutches 116 , 16 are indicated in bold.

[0064] According to the simulation of the inventor, according to the prior art ( Figure 1 ), the inertia torque applied to the engine clutch is 0.1237kg·m2, while in the structure according to the present invention, the inertia torque applied to the engine clutch is only 0.00133kg·m2. In this way, since the inertia force on the output side of the engine clutch 16 of the present invention is reduced when torque is applied from the engine, it is easier to prepare for the impact on the one-way clutch and the responsiveness is improved. In addition, since the torsional vibration damper 22 is located in the power transmission system close to the engine clutch 16, it is easy to absorb the impact caused by engine fluctuations, and the capacity of the engine clutch 16 can also be reduced.

[0065] In addition, the present invention integrates the damper structure connected to the lock-up clutch in the prior art into the rotor hub, but even if the damper structure is changed, it will not have an adverse effect on the power flow of the hybrid transmission. On the contrary, when the motor output is transmitted, since there is no damper structure on the power transmission path, the fluctuation caused by the motor power transmission is reduced.

[0066] Reference Figure 3 A stopper 19 may be formed on the outer race 18 to protrude axially to prevent excessive compression of the spring 23, and the stopper 19 may be configured to be combined with a stopper groove 20 formed on the rotor hub cover 12. In addition, the outer race 18 is provided with a plurality of hooks 21 protruding in the radial direction to transmit power to the shock absorber 22.

[0067] An ATF flow path is provided for cooling and lubricating the damper 22 and the engine clutch 16. Figure 7 , oil flow paths 26a, 26b for ATF are respectively formed in the drive shaft 14 and the rotor hub cover 12. Looking at the path marked as "Oil-path", in addition to the path for ATF to be directly supplied to the lock-up clutch 34 of the torque converter 30, a path is formed to reach the lock-up clutch 34 via the engine clutch 16 and the torsional vibration damper 22. Therefore, ATF can be smoothly supplied to the engine clutch 16 and the torsional vibration damper 22.

[0068] like Figure 6 As shown in (b), when the rotor hub cover 12 ′ is located on the opposite side of the lock-up clutch 34 , the oil flow path 26 b ′ may be formed on the rotor hub 10 .

[0069] As described above, the present invention proposes a system configuration in which a torsional vibration damper is coupled to a rotor hub to form a compact hybrid module structure. By configuring an outer race having a relatively small inertia torque at the rear end of an engine clutch, the impact generated when torque is applied from the engine can be reduced, and the torsional vibration damper can damp vibration secondarily.

[0070] Above, the embodiments of the present invention are described with reference to the accompanying drawings, but a person skilled in the art to which the present invention belongs should understand that the present invention can be implemented in other specific forms without changing the technical ideas or essential features of the present invention. Therefore, it should be understood that the above embodiments are exemplary rather than restrictive. The protection scope of the present invention should be interpreted according to the attached claims, and it should be interpreted that all technical ideas within the equivalent scope thereof are included in the scope of rights of the present invention.

Claims

1. A hybrid power transmission module, which is a hybrid power transmission module equipped with a drive shaft, a rotor hub and an engine clutch, wherein: include: A drive plate arranged on an outer peripheral surface of the engine clutch; as well as a torsional vibration damper arranged to contact the driving plate and having a plurality of springs, The drive plate and the torsional vibration damper are arranged within the rotor hub.

2. The hybrid transmission module according to claim 1, wherein: The engine clutch is configured to transmit the driving force of the engine to the drive plate when the driving force of the engine is coupled to the engine clutch.

3. The hybrid transmission module according to claim 2, wherein: The drive plate is configured to transmit the driving force of the engine from the engine clutch to the torsional vibration damper when the driving force of the engine is coupled to the engine clutch.

4. The hybrid transmission module according to claim 3, wherein: The drive plate has a plurality of hooks protruding radially outwardly so as to transmit the driving force of the engine to the torsional vibration damper.

5. The hybrid transmission module according to claim 1, wherein: Also includes rotor hub cap, The rotor hub and the rotor hub cover respectively have a plurality of locking portions for the spring of the torsional vibration damper to be inserted.

6. The hybrid transmission module according to claim 1, wherein: The engine clutch is a one-way clutch.

7. The hybrid transmission module according to claim 1, wherein: Also includes a torque converter, The torque converter has no torsional vibration damper.

8. The hybrid transmission module according to claim 1, wherein: Also included is an oil flow path in fluid communication with the engine clutch and / or the torsional vibration damper.

9. The hybrid transmission module according to claim 8, wherein: The oil flow path includes a first oil flow path located radially inward of the engine clutch.

10. The hybrid transmission module according to claim 8 or 9, wherein: The oil flow path includes a second oil flow path located radially outward of the engine clutch.

11. The hybrid transmission module according to claim 9, wherein: The first oil flow path is formed on the drive shaft.

12. The hybrid transmission module according to claim 10, wherein: The second oil flow path is formed on the rotor hub cover or the rotor hub.

13. A hybrid transmission module, wherein: include: The drive shaft is used to transmit the engine's torque; The rotor hub, on which the rotor of the electric motor is mounted; an engine clutch connected to the drive shaft; as well as A torsional vibration damper is arranged between the engine clutch and the rotor hub.

14. The hybrid transmission module according to claim 13, wherein: The torsional vibration damper includes a driving plate, one or more springs, and a driven plate. The driven plate includes the rotor hub.

15. The hybrid transmission module according to claim 14, wherein: The engine clutch comprises: a power input portion for inputting power into the drive shaft; and The power output part outputs power when the engine clutch is running. The driving plate is connected to the power output portion.

16. The hybrid transmission module according to claim 15, wherein: The engine clutch comprises a one-way clutch, The power input part includes an inner race of the one-way clutch, The power output portion includes an outer race of the one-way clutch.

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