Hybrid drive module

Abstract

The present invention relates to a hybrid drive module which securely supports members connected so as to be rotatable relative to each other in an axial direction while facilitating assembly between the members, comprising: a housing to which a stator is fixed; a rotor hub which is disposed at the rear of the housing in the axial direction and to which a rotor is fixed; a hub protrusion disposed between the housing and a rotor hub and connected to the rotor hub on a radially outer side to be rotationally restricted; the convex bearing is arranged between the hub bulge and the shell and is connected with the hub bulge and the shell, so that the hub bulge can rotate relative to the shell; and a protrusion fixing member detachably coupled to the rotor hub to restrict forward movement of the hub protrusion relative to the rotor hub. The hub protrusion and the shell are aligned in the radial direction through the protrusion bearing, the hub protrusion and the shell are mutually restrained in the two axial directions, and in the shell, an assembly hole is formed in the position, opposite to the coupling position of the protrusion fixing component and the hub protrusion in the axial direction, of the shell.

Description

Technical Field

[0001] This application claims priority benefit based on Korean Patent Application No. 10-2022-0162004 filed on November 28, 2022, and all the content disclosed in the Korean patent application document is incorporated herein as part of this specification.

[0002] The present invention relates to a hybrid drive module, and more particularly, to a hybrid drive module that firmly supports relatively rotatably connected members in the axial direction while facilitating the assembly between the members. Background Art

[0003] The drive module adopted in a hybrid vehicle has a structure for transmitting the power of an electric motor and an engine to a transmission. The hybrid drive module may include: an input member that receives power from the engine; a housing that supports a stator; a rotor hub that supports a rotor; an engine clutch that connects the input member and the rotor hub between the input member and the rotor hub; an output member that receives power from the rotor hub from the electric motor and / or the engine and transmits it to the transmission; and a power transmission unit that connects the rotor hub and the output member between the rotor hub and the output member. The power transmission unit may have a structure including a torque converter and a lock-up clutch arranged in parallel on the power system.

[0004] The housing and the stator are fixed members, while the input member, the rotor hub, the engine clutch, the output member, and the power transmission unit are rotating members. In order to achieve the modularization of the hybrid drive module, it is necessary to rotatably connect the fixed member and the rotating member while being restricted from each other in two axial directions.

[0005] From the structure of the hybrid drive module disclosed in Korean Patent Publication No. KR 10-2239269B1, the raised bearing and the hub shaft bearing can prevent the forward movement of the rotor hub (the direction in which the rotor hub axially approaches the housing), but the raised bearing and the hub shaft bearing cannot prevent the backward movement of the rotor hub (the direction in which the rotor hub axially moves away from the housing). In addition, the input shaft bearing can prevent the backward movement of the input member, but the input shaft bearing and the hub shaft bearing cannot prevent the forward movement of the input member.

[0006] To solve the above problems, it is necessary to structurally change the raised bearing so that it can prevent the backward movement of the rotor hub, and it is necessary to structurally change the input shaft bearing or the hub shaft bearing so that it can prevent the forward movement of the input member.

[0007] However, these structural changes require adding more parts and also a complex assembly process. In addition, since it is difficult to disassemble after assembly, there may be a problem that maintenance becomes very troublesome. Summary of the Invention

[0008] The present invention is proposed to solve the above problems, and its object is to provide a hybrid drive module, which minimizes the increase in the number of components in a structure for firmly supporting axially and relatively rotatably connected components, and is easy to assemble and disassemble.

[0009] The object of the present invention is to provide a hybrid drive module, which reduces costs by minimizing the application of bearings for supporting radial and axial rotations, and these bearings must be used in a structure for firmly supporting axially and relatively rotatably connected components.

[0010] The object of the present invention is to provide a hybrid drive module, which can reduce costs by minimizing the use of large-capacity bearings, and these bearings must be used in a structure for firmly supporting axially and relatively rotatably connected components.

[0011] The technical problems of the present invention are not limited to this. Other objects and advantages of the present invention not mentioned can be understood through the following description and more clearly understood through the embodiments of the present invention. In addition, it can be easily understood that the objects and advantages of the present invention can be achieved by the means and combinations thereof appearing in the patent claims.

[0012] The present invention for solving the above problems can be applied to a hybrid drive module, which has a motor 50 disposed between an engine and a transmission in a power system and supplies power to the transmission.

[0013] The hybrid drive module may include a housing 10 fixed with a stator 51, and the housing is a non-rotating component.

[0014] The hybrid drive module. As a rotating component, it may include: a rotor hub 20, axially disposed behind the housing 10 and fixed with a rotor 52; and a hub protrusion 40, disposed between the housing 10 and the rotor hub 20, and rotatably connected to the rotor hub 20 with its rotation restricted on the radial outside.

[0015] The hub protrusion 40 and the rotor hub 20 may be fixed by a protrusion fixing member 49.

[0016] The protrusion fixing member 49 is detachably coupled to the rotor hub 20 to restrict the forward movement of the hub protrusion 40 relative to the rotor hub 20.

[0017] In the housing 10, an assembly hole 12 is provided at a position axially opposite to the coupling portion of the protruding fixing member 49 and the hub protrusion 40.

[0018] The hybrid drive module may include a protruding bearing 47 for connecting a non-rotating member and a rotating member. The protruding bearing 47 is disposed between the hub protrusion 40 and the housing 10 and connects the hub protrusion 40 and the housing 10 so that the hub protrusion 40 can rotate relative to the housing 10.

[0019] The protruding bearing 47 radially constrains the hub protrusion 40 and the housing 10 and axially constrains them in both directions.

[0020] Therefore, when assembling the hybrid drive module, first, the housing 10 and the hub protrusion 40 are assembled together with the protruding bearing 47 radially and axially constraining each other (S01). Then, with the radial outer side of the hub protrusion 40 connected to the rotor hub 20 and its rotation restricted (S02), the protruding portion fixing member 49 is coupled to the rotor hub 20 through the assembly hole 12 (S03). Thus, the non-rotating member and the rotating member can be simply assembled together while being radially and axially restricted from each other.

[0021] The disassembly of these members can also be simply completed in the reverse order of the assembly.

[0022] One or more than two assembly holes 12 are provided in the housing 10 in the circumferential direction. However, for ease of assembly, it is sufficient to provide only one assembly hole 12.

[0023] A sealing cover 13 for sealing the assembly hole 12 is detachably provided in the assembly hole 12. That is, after the assembly is completed, the housing 10 can be completed by installing the sealing cover 13 into the assembly hole 12 (S04). Therefore, fluid leakage from the inside of the housing 10 to the outside of the housing 10 can be prevented.

[0024] The rotor hub 20 may include an axially extending portion 24 for fixing the rotor 52.

[0025] The rotor 52 may be disposed radially outside the axially extending portion 24.

[0026] An elastic gasket 28 that can be elastically deformed and restored axially may be disposed in front of or behind the rotor 52.

[0027] When pressing the hub projection 40 against the rotor 52 in front of the rotor 52 and the elastic gasket 28, the elastic gasket 28 can be axially compressed and deformed. In this state, when fastening the projection fixing member 49 to the rotor hub 20, the axial positions of the rotor 52 and the hub projection 40 relative to the rotor hub 20 can be fixed more firmly.

[0028] The projection fixing member 49 may include a projection snap ring 49 that is inserted into a card slot 242 that radially depresses into the rotor hub 20 in front of the hub projection 40.

[0029] The card slot 242 may be formed on the outer circumferential surface or the inner circumferential surface of the axially extending portion 24.

[0030] Thereby, through a simple operation of elastically deforming the diameter of the projection snap ring 49 to increase or decrease it through the assembly hole 12 and then elastically resetting it and inserting it into the card slot 242, the hub projection 40 can be assembled to the rotor hub 20 in a state where the hub projection 40 is first assembled to the housing 10.

[0031] The outer diameter of the centrifugal end portion of the hub projection 40 may be larger than the inner diameter of the projection snap ring 49. Thereby, in a state where the projection snap ring 49 is placed between the housing 10 and the hub projection 40, after first assembling the housing 10 and the hub projection 40, the projection snap ring 49 can be prevented from separating from the pre-assembled member.

[0032] A protruding portion 411 that protrudes forward may be provided at the centrifugal end portion of the hub projection 40. Moreover, the inner diameter of the protruding portion 411 may be larger than the outer diameter of the projection snap ring 49. Thereby, the centers of the projection snap ring 49 and the hub projection 40 can be temporarily aligned, making it easier to assemble the projection snap ring 49 through the assembly hole 12.

[0033] Finger portions 241 that extend forward from the rotor hub 20 and are arranged at intervals in the circumferential direction may be provided in front of the rotor hub 20. A hub coupling portion 41 through which the finger portions 241 axially penetrate may be provided on the hub projection 40.

[0034] Thereby, when the hub projection 40 relatively moves rearward from the front of the rotor hub 20 and the finger portions 241 are inserted into the hub coupling portion 41, the rotor hub 20 and the hub projection 40 can be easily aligned in the circumferential direction.

[0035] When the finger portions 241 penetrate through the hub coupling portion 41, the finger portions 241 will interfere with the hub projection 40 in the circumferential direction. Therefore, the hub projection 40 can be rotationally restricted relative to the rotor hub 20.

[0036] The hub joint portion 41 may be in the form of an axially penetrating hole or a groove that axially penetrates and opens in the centrifugal direction.

[0037] On either the radially outer or inner side of the raised bearing 47, one side may be supported by the housing 10 and the other side may be supported by the hub projection 40. Thus, the housing 10 and the hub projection 40 may be radially aligned with each other.

[0038] Either the front or the rear of one side of the raised bearing 47 may be supported by the housing 10, and the other side may be supported by the first bearing snap ring 15 coupled to the housing 10.

[0039] Either the front or the rear of one side of the raised bearing 47 may be supported by the hub projection 40, and the other side may be supported by the second bearing snap ring 422 coupled to the hub projection 40.

[0040] The radially outer side of the raised bearing 47 may be supported by the hub projection 40, and the radially inner side may be supported by the housing 10. Of course, the arrangement may also be reversed.

[0041] The radially inner side of the raised bearing 47 may be supported by an outer diameter enlarged shape, such as an outward step shape, provided in the housing 10 toward the front, and may be supported by the first bearing snap ring 15 detachably inserted into a groove provided on the outer peripheral surface of the housing 10 toward the rear. Of course, the arrangement may also be reversed.

[0042] The radially outer side of the raised bearing 47 may be supported by an inner diameter reduced shape, such as an inward step shape, provided in the hub projection 40 toward the rear, and may be supported by the second bearing snap ring 422 detachably inserted into a groove provided on the inner peripheral surface of the hub projection 40 toward the front. Of course, the arrangement may also be reversed.

[0043] Thereby, the raised bearing 47 is inserted backward from the front of the inner peripheral surface of the hub projection 40, the second bearing snap ring 422 is inserted from the front of the raised bearing 47 into the groove formed on the inner peripheral surface of the hub projection 40, then the raised bearing 47 is inserted forward and outward from the rear of the outer peripheral surface of the housing 10, and the first bearing snap ring 15 is inserted from the rear of the raised bearing 47 into the groove formed on the outer peripheral surface of the housing 10, so that the housing 10 and the hub projection 40 can be assembled first.

[0044] The configurations of the hub projection 40, the raised bearing 47, the housing 10, the first bearing snap ring 15, the second bearing snap ring 422, the inward step, and the outward step may be variously changed within the scope of the simple pre-assembly as described above.

[0045] The raised bearing 47 may be a bearing including an outer ring, an inner ring, and rolling elements disposed between the outer ring and the inner ring. For example, it may be a ball bearing. Thus, in the raised bearing 47, it can be understood that the radially outer side refers to the outer peripheral surface of the outer ring, the front and rear of the radially outer side refer to the front and rear of the outer ring, the radially inner side refers to the inner peripheral surface of the inner ring, and the front and rear of the radially inner side refer to the front and rear of the inner ring.

[0046] A piston plate 43 may be disposed behind the hub projection 40, and the piston plate 43 is slidably disposed axially on the hub projection 40.

[0047] The inner peripheral surface of the piston plate 43 may slide with the hub projection 40. The outer peripheral surface of the piston plate 43 may slide with the hub projection 40.

[0048] Therefore, even if the piston plate 43 has been disposed on the hub projection 40 before the housing 10 and the hub projection 40 are assembled first, it will not affect the assembly process of the housing 10 and the hub projection 40, nor the assembly process of the hub projection 40 and the rotor hub 20.

[0049] A compensation plate 45 may be disposed behind the piston plate 43 within the hub projection 40.

[0050] The compensation plate 45 may be disposed on the hub projection 40 such that it does not move backward relative to the hub projection 40. The piston plate 43 may slide with the radially outer end of the compensation plate 45.

[0051] Therefore, even if the compensation plate 45 has been disposed on the hub projection 40 before the housing 10 and the hub projection 40 are assembled first, it will not affect the assembly process of the housing 10 and the hub projection 40, nor the assembly process of the hub projection 40 and the rotor hub 20.

[0052] The engine clutch 37 that selectively transmits the power of the engine to the rotor hub 20 may be axially disposed between the piston plate 43 and the rotor hub 20. The piston plate 43 may be disposed in front of the first clutch assembly 38 of the engine clutch 37.

[0053] Therefore, the assembly of the rotor hub 20 and the hub projection 40 can be performed with the first clutch assembly 38 disposed on the rotor hub 20.

[0054] The hybrid drive module may further include an input member 30 for connecting the engine and the engine clutch 37.

[0055] The hybrid drive module may further include a hub shaft bearing 22 that connects the input member 30 and the rotor hub 20 such that the input member 30 is rotatable relative to the rotor hub 20.

[0056] The hub shaft bearing 22 may be disposed between the input member 30 and the rotor hub 20 to directly connect them. Since the hub projection 40 is assembled with the rotor hub 20 as a unit, the hub shaft bearing 22 may be connected between the input member 30 and the hub projection 40 to connect the input member 30 and the rotor hub 20 through the hub projection 40.

[0057] The hybrid drive module may further include an input shaft bearing 34 that connects the input member 30 and the housing 10 such that the input member 30 is rotatable relative to the housing 10.

[0058] The input shaft bearing 34 is disposed between the input member 30 and the housing 10 to directly connect them.

[0059] The hub shaft bearing 22 may radially restrain the input member 30 and the rotor hub 20 from each other. That is, the input member 30 and the rotor hub 20 are interposed with the hub shaft bearing 22 therebetween, so that they can be kept in a state of being aligned with each other radially. That is, the centers of the input member 30 and the rotor hub 20 can be aligned.

[0060] The input shaft bearing 34 may radially restrain the input member 30 and the housing 10 from each other. That is, the input member 30 and the housing 10 are interposed with the input shaft bearing 34 therebetween, so that they can be kept in a state of being aligned with each other radially. That is, the centers of the input member 30 and the housing 10 can be aligned.

[0061] Only the first bearing selected from the hub shaft bearing 22 and the input shaft bearing 34 can restrict the input member 30 from moving forward.

[0062] That is, if the input member 30 is restricted from moving forward by the hub shaft bearing 22 and the rotor hub 20, the input member 30 may not be restricted from moving forward by the input shaft bearing 34 and the housing 10. Or, if the input member 30 is restricted from moving forward by the input shaft bearing 34 and the housing 10, the input member 30 may not be restricted from moving forward by the hub shaft bearing 22 and the rotor hub 20.

[0063] Only the second bearing selected from the hub shaft bearing 22 and the input shaft bearing 34 can restrict the input member 30 from moving backward.

[0064] That is, if the input member 30 is restricted from moving backward by the hub shaft bearing 22 and the rotor hub 20, the input member 30 may not be restricted from moving backward by the input shaft bearing 34 and the housing 10. Or, if the input member 30 is restricted from moving backward by the input shaft bearing 34 and the housing 10, the input member 30 may not be restricted from moving backward by the hub shaft bearing 22 and the rotor hub 20.

[0065] The first bearing and the second bearing may be the same bearing.

[0066] That is, if the forward and backward movement of the input member 30 is restricted by the hub shaft bearing 22 and the rotor hub 20, the forward and backward movement of the input member 30 may not be restricted by the input shaft bearing 34 and the housing 10. Or, if the forward and backward movement of the input member 30 is restricted by the input shaft bearing 34 and the housing 10, the forward and backward movement of the input member 30 may not be restricted by the hub shaft bearing 22 and the rotor hub 20.

[0067] The first bearing and the second bearing may be different bearings.

[0068] That is, if the input member 30 is allowed to move forward and restricted from moving backward by the hub shaft bearing 22 and the rotor hub 20, the input member 30 may be restricted from moving forward and allowed to move backward by the input shaft bearing 34 and the housing 10. Or, if the input member 30 is allowed to move forward and restricted from moving backward by the input shaft bearing 34 and the housing 10, the input member may be restricted from moving forward and allowed to move backward by the hub shaft bearing 22 and the rotor hub 20.

[0069] Since the raised bearing 47 restricts and fixes the hub projection 40 of the rotor hub 20 and the housing 10 in both axial directions, the axial distance between the housing 10 and the rotor hub 20 can be defined as constant.

[0070] Therefore, as long as the input member 30 is restricted from moving forward relative to one of the housing 10 and the rotor hub 20 and restricted from moving backward relative to one of the housing 10 and the rotor hub 20, its axial position can be restricted to remain constant relative to both the housing 10 and the rotor hub 20.

[0071] The radially outer side of the input shaft bearing 34 can be supported by the housing 10, and the radially inner side can be supported by the input member 30. Of course, the arrangement can also be reversed.

[0072] The radially inner side of the input shaft bearing 34 can be supported by a rearward-facing outer diameter enlarged shape, such as an outward step shape, provided on the input member 30, and can be supported by a snap ring detachably inserted into a groove provided on the outer circumferential surface of the input member 30. Of course, the reverse arrangement is also possible.

[0073] The radially outer side of the input shaft bearing 34 can be supported rearward by an inner diameter reduced shape, such as an inward step shape, provided in the housing 10, and can be supported forward by a snap ring detachably inserted into a groove provided on the inner circumferential surface of the housing 10. Of course, the arrangement can also be reversed.

[0074] The input shaft bearing 34 can be a bearing including an outer ring, an inner ring, and rolling elements provided between the outer ring and the inner ring. For example, it can be a ball bearing. Therefore, it can be understood that in the input shaft bearing 34, the radially outer side refers to the outer circumferential surface of the outer ring, the front and rear of the radially outer side refer to the front and rear of the outer ring, the radially inner side refers to the inner circumferential surface of the inner ring, and the front and rear of the radially inner side refer to the front and rear of the inner ring.

[0075] The radially outer side of the hub shaft bearing 22 can be supported by the input member 30, and the radially inner side can be supported by the rotor hub 20. Of course, the arrangement can also be reversed.

[0076] The hub shaft bearing 22 may not limit the axial position of the input member 30 relative to the rotor hub 20.

[0077] The hub shaft bearing 22 can be a needle bearing.

[0078] The input shaft bearing 34 can be located more forward than the hub shaft bearing 22.

[0079] Thereby, the hub projection 40 can be assembled to the housing first, and in a state where the input member 30 is assembled to the housing 10 through the input shaft bearing 34, the hub projection 40 can be assembled to the rotor hub 20 provided with the hub shaft bearing 22. Thereby, the input member 30 can be connected to the hub shaft bearing 22 without other axial couplings.

[0080] The arrangement of the input member 30, the input shaft bearing 34, the housing 10, the snap ring, and the inward and outward steps can be variously changed within the scope of the simple pre-assembly as described above.

[0081] Advantages of the Invention

[0082] According to the hybrid drive module of the present invention, an increase in the number of components can be minimized, the assembly process and disassembly are convenient, and components that are rotatably connected relative to each other can be firmly supported axially.

[0083] By improving the axial restraint structure between components, the present invention enables the application of low-cost bearings with only a radial rotation support function. Thus, the application of expensive bearings that support both radial and axial rotations can be minimized.

[0084] By designing the housing and the rotor hub to be axially constrained by the raised bearings to reduce the required capacity of the hub shaft bearings, a more axially compact hybrid drive module can be designed.

[0085] Based on the above effects, the specific effects of the present invention will be described below through specific embodiments. Brief Description of the Drawings

[0086] Figure 1 is a sectional view of an embodiment of a hybrid drive module according to the present invention.

[0087] Figures 2 to 5 is a view showing the assembly steps of the hybrid drive module of the embodiment in sequence with the input component omitted.

[0088] Figure 6 is a flowchart of the assembly steps of the hybrid drive module of the embodiment.

[0089] [Reference Signs]

[0090] 10: Housing, 12: Assembly hole, 13: Sealing cover, 14: Sealing ring, 15: First bearing snap ring, 20: Rotor hub, 21: Hub shaft, 22: Hub shaft bearing, 23: Radial extension, 24: Axial extension, 241: Finger portion, 242: Card slot, 251: First rotor-side bracket, 252: Second rotor-side bracket, 26: First accommodation space, 27: Second accommodation space, 28: Elastic gasket, 30: Input member, 33: Input-side bracket, 34: Input shaft bearing, 37: Engine clutch, 38: First clutch assembly, 40: Hub protrusion, 41: Hub joint portion, 411: Protrusion portion, 42: Piston setting portion, 422: Second bearing snap ring, 43: Piston plate, 430: First working chamber, 44: Operation hole, 45: Compensation plate, 450: Compensation chamber, 46: Compensation hole, 47: Protrusion bearing, 48: Return spring, 49: Protrusion fixing member (protrusion snap ring), 50: Motor, 51: Stator, 52: Rotor, 55: Rear cover, 56: Pump drive hub, 57: Cover bearing, 60: Torque converter, 61: Impeller, 62: Turbine, 63: Turbine plate, 64: Reactor, 65: Fixed end, 67: One-way clutch, 70: Lock-up clutch, 71: Second clutch assembly, 72: Output-side bracket, 75: Piston member, 750: Second working chamber, 80: Output member, 81: Output spline, 88: Bearing, 89: Gasket Detailed implementation manners

[0091] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0092] The present invention is not limited to the embodiments disclosed below, and various modifications can be made and it can be implemented in different forms from each other. However, these embodiments are provided to make the disclosure of the present invention complete and to fully convey the scope of the invention to those with ordinary knowledge. Therefore, it should be understood that the present invention is not limited to the embodiments disclosed below, and includes not only replacing or adding the features of one embodiment with those of other embodiments, but also all changes, equivalents, and substitutes included in the technical concept and scope of the present invention.

[0093] It should be understood that the accompanying drawings are only for conveniently understanding the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited to the accompanying drawings, including all changes, equivalents, and substitutes included in the concept and technical scope of the present invention. In the drawings, for the sake of easy understanding, etc., the dimensions or thicknesses of the components may be exaggerated or reduced, but the scope of protection of the present invention shall not be limited by this for interpretation.

[0094] The terms used in this specification are only for describing specific implementation examples or embodiments, and are not intended to limit the present invention. Unless otherwise clearly specified in the context, singular expressions include plural expressions. In the specification, terms such as "including ~", "consisting of ~" are intended to indicate the existence of features, numbers, steps, operations, components, devices or combinations thereof described in the specification. That is, in the specification, terms such as "including ~", "consisting of ~" should be understood as not precluding the existence or additional possibility of one or more other features, numbers, steps, operations, components, devices or combinations thereof.

[0095] Ordinal terms such as first, second, etc. may be used to describe various components, but the components are not limited by the terms. The terms are only used for the purpose of distinguishing one component from another component.

[0096] When referring to a component being "connected" or "coupled" to another component, it should be understood that it can be directly connected or coupled to the other component, but there may also be other components in between. Conversely, when referring to a component being "directly connected" or "directly coupled" to another component, it should be understood that there are no other components in between.

[0097] When referring to a component being "connected" or "connected to" another component, it should be understood that it can include the case of being directly connected or connected to the other component, and there may also be other components in between. On the contrary, when referring to a component being "directly connected" or "directly connected to" another component, it should be understood that there are no other components in between.

[0098] When referring to a component being "located" "above" or "below" another component, it should be understood that it includes not only being disposed directly above the other component, but there may also be other components in between.

[0099] Unless otherwise defined, all terms used herein, including technical terms or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms that are the same as those defined in a commonly used dictionary should be interpreted as having the same meaning in the context of the relevant technology, and should not be interpreted as ideal or overly formal meanings unless clearly defined in this application.

[0100] Since the hybrid drive module of the embodiment is symmetric with respect to the axis, only half of it is shown with respect to the axis for ease of drawing. In addition, for ease of explanation, the direction along the length direction of the axis that constitutes the center of rotation of the hybrid drive module is referred to as the axial direction. That is, the front-rear direction or the axial direction is the direction parallel to the rotation axis, the front (front side) points to one side where the power source is located, for example, the direction toward the engine side, and the rear (rear side) points to the other side, for example, the direction toward the transmission side. Therefore, the front (front face) refers to the face whose surface faces forward, and the rear (back face) refers to the face whose surface faces backward.

[0101] The radial direction or the radius direction refers to the direction approaching the center 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 moving away from the center in the radial direction is referred to as the centrifugal direction, and the direction approaching the center is referred to as the centripetal direction.

[0102] The circumferential direction or the circular direction refers to the direction around the periphery of the rotation axis. The outer circumference refers to the outer circular circumference, and the inner circumference refers to the inner circular circumference. Therefore, the outer peripheral surface is the surface facing away from the rotation axis, and the inner peripheral surface is the surface facing the rotation axis.

[0103] The circumferential side surface refers to the surface whose normal line of the surface faces the circumferential direction.

[0104] [Overall Structure of Hybrid Drive Module]

[0105] The hybrid drive module of the present invention is disposed between the engine and the transmission in the power system. In the drawings of the embodiment, the engine is disposed on the left side and the transmission is disposed on the right side.

[0106] The hybrid drive module includes an electric motor 50 that supplies power to the transmission. The electric motor 50 includes a stator 51 and a rotor 52.

[0107] The stator 51 is fixed to the housing 10 of the hybrid drive module. And the rotor 52 is accommodated in the housing 10 more radially inward than the stator 51. The rotor 52 may be fixed to a rotor hub 20 disposed inside the housing 10.

[0108] An input member 30 that is connected to the engine and receives power from the engine is provided at the front center of the housing 10. The input member 30 is rotatably supported by the housing 10 through an input shaft bearing 34.

[0109] The input member 30 protrudes more forward than the housing 10, and an input spline 32 is formed on the outer peripheral surface of the protruding portion. A torsional damper (not shown) is connected to the input spline 32. The input side of the torsional damper is connected to the engine, and the output side is connected to the input member 30.

[0110] A seal ring 14 is interposed in front of the input shaft bearing 34 between the inner peripheral surface of the housing 10 and the outer peripheral surface of the input member 30. That is, fluid supplied from the transmission is filled behind the seal ring 14, and the seal ring 14 and the housing 10 form a boundary of a space for filling the fluid. That is, the torsional damper can be a dry spring damper.

[0111] The rotor hub 20 may include: an axially extending portion 24 for fixing the rotor 52; and a radially extending portion 23 that extends radially inward from the axially extending portion 24. The axially extending portion 24 may have a cylindrical shape extending in the axial direction.

[0112] The radially extending portion 23 is connected to a substantially central portion in the axial direction of the axially extending portion 24.

[0113] A hub shaft 21 extending in the axial direction is provided at a radially inner end of the radially extending portion 23. The hub shaft 21 is axially disposed behind the input member 30, and a part of the axial segment overlaps with the input member 30. A hub shaft bearing 22 is interposed in an interval where the input member 30 and the hub shaft 21 overlap, so that the input member 30 and the hub shaft 21 support and rotate with each other.

[0114] A hub projection 40 is connected to a front end of the axially extending portion 24. The hub projection 40 is inserted into the axially extending portion 24 in a form that is received in a radially inner space of the axially extending portion 24 from the front of the axially extending portion 24. At this time, a hub engaging portion 41 provided at a radially outer end of the hub projection 40 may be engaged with the axially extending portion 24 to restrict rotation.

[0115] Specifically, the hub engaging portion 41 may be provided in a hole shape penetrating in the front-rear direction, or may be provided in a groove shape recessed radially inward from the outer periphery of the hub projection 40, that is, in a form that is open in the front-rear direction and open in the centrifugal direction. A plurality of hub engaging portions 41 may be arranged at equal intervals in the circumferential direction of the hub projection 40.

[0116] Finger portions 241 further extending forward from the axially extending portion 24 are provided on the rotor hub 20. A plurality of finger portions 241 may be provided at equal intervals in the circumferential direction of the rotor hub 20.

[0117] The angle between two circumferentially adjacent finger portions 241 may correspond to the angle between two circumferentially adjacent hub engaging portions 41. In addition, the radial distance from the rotation center to the finger portion 241 may correspond to the radial distance from the rotation center to the hub engaging portion 41.

[0118] Then, in a state where the circumferential position of the hub projection 40 relative to the rotor hub 20 is adjusted to a fixed position, the rotor hub 20 and the hub projection 40 can be axially connected.

[0119] Next, a projection fixing member 49 is coupled in front of the hub projection 40 in the axially extending portion 24. In an embodiment, the projection fixing member 49 can be a projection snap ring 49, and a slot 242 for inserting the projection snap ring 49 can be provided in the finger portion 241 of the axially extending portion 24. However, the projection fixing member 49 does not necessarily have a snap ring-slot structure, and other fastening elements, such as bolts, etc., can also be applied as long as it is a structure that can fix the hub projection 40 to the axially extending portion 24.

[0120] The slot 242 can be provided on the inner circumferential surface or the outer circumferential surface of the finger portion 241. In an embodiment, a structure in which the slot 242 is provided on the outer circumferential surface of the finger portion 241 is illustrated.

[0121] The projection snap ring 49 inserted into the slot 242 can prevent the hub projection 40 from detaching from the axially extending portion 24.

[0122] In order to absorb the manufacturing tolerances and assembly tolerances of the parts, an elastic gasket 28 is interposed in front of or behind the rotor 52. Therefore, in a state where the hub projection 40 is strongly pushed backward and the elastic gasket 28 is elastically compressed axially, when the projection snap ring 49 is coupled in front of the projection snap ring 49, the gap between the rotor 52 and the rotor hub 20 and the gap between the hub projection 40 and the rotor hub 20 are absorbed, thereby preventing vibration. An embodiment discloses a structure in which an elastic gasket 28 is interposed between the rotor 52 and the hub projection 40.

[0123] The radially inner end of the hub projection 40 has a piston setting portion 42 extending backward, and the radially inner end of the housing 10 also extends more radially inward and backward than the hub projection 40. A projection bearing 47 is provided therebetween. That is, the hub projection 40 is rotatably supported by the housing 10.

[0124] Thus, the rotor hub 20 is rotatably supported by the housing 10 through the hub projection 40 and the projection bearing 47, and is rotatably supported by the housing 10 through the hub shaft bearing 22, the input member 30, and the input shaft bearing 34.

[0125] Since the positions of the projection bearing 47 and the hub shaft bearing 22 are axially spaced from each other, the central axis of the rotor hub 20 can be accurately aligned with the central axis of the housing 10 without tilting.

[0126] The radially inner space of the axial extension 24 of the rotor hub 20 forms a space filled with a fluid such as transmission oil. This space can be partitioned by the radial extension 23 into a first accommodation space 26 and a second accommodation space 27. The first accommodation space 26 can define the space between the radial extension 23 and a rear cover 55 described later in the axial direction. The second accommodation space 27 can define the space between the hub projection 40 and the radial extension 23 in the axial direction. The second accommodation space 27 provided in front of the radial extension 23 is arranged more forward than the first accommodation space 26.

[0127] The input member 30 is disposed in the second accommodation space 27. The input member 30 is connected to the rotor hub 20 by an engine clutch 37. The engine clutch 37 is also disposed in the second accommodation space 27. The engine clutch 37 has a first clutch assembly 38, and a plurality of friction plates are arranged axially in the first clutch assembly 38.

[0128] The radially outer side of the first clutch assembly 38 is fixed to a second rotor-side bracket 252 provided on the inner circumferential surface of the axial extension 24 of the rotor hub 20, and the radially inner side of the first clutch assembly 38 is fixed to an input-side bracket 33 that extends radially outward from the rear end of the input member 30.

[0129] A piston plate 43 is arranged in front of the first clutch assembly 38. The piston plate 43 is arranged axially between the hub projection 40 and the first clutch assembly 38. The outer circumferential surface of the piston plate 43 is in slidable contact with the hub projection 40, and the inner circumferential surface of the piston plate 43 is in slidable contact with a piston setting portion 42 of the hub projection 40. The space between the piston plate 43 and the hub projection 40 forms a first working chamber 430.

[0130] An operation hole 44 is provided in the hub projection 40 and is connected in communication with the first working chamber 430.

[0131] A compensation plate 45 is arranged in front of the engine clutch 37 and behind the piston plate 43. The radially inner end of the compensation plate 45 is supported on the piston setting portion 42 of the hub projection 40. The backward movement of the compensation plate 45 is restricted by a snap ring installed on the outer circumferential surface of the piston setting portion 42.

[0132] The outer circumferential surface of the compensation plate 45 contacts the piston plate 43. That is, the piston plate 43 is in slidable contact with the compensation plate 45.

[0133] A space between the piston plate 43 and the compensation plate 45 forms a compensation chamber 450. A return spring 48 is installed in the compensation chamber 450. The return spring 48 is interposed between the piston plate 43 and the compensation plate 45, and elastically presses the piston plate 43 in a direction away from the compensation plate 45. That is, the return spring 48 applies an elastic force to the piston plate 43 in a direction to relieve the pressure on the first clutch assembly 38.

[0134] The radially inner boundary of the compensation chamber 450 may be defined by the piston setting portion 42. A compensation hole 46 communicating with the compensation chamber 450 is provided on the piston setting portion 42 of the hub projection 40.

[0135] Although not shown, a first flow path communicating with the operation hole 44 is provided on the housing 10. The fluid supplied to the first working chamber 430 is supplied to the first working chamber 430 through the first flow path and the operation hole 44. Then, the engine clutch 37 operates, and the power of the engine is transmitted to the rotor hub 20 through the input member 30 and the first clutch assembly 38.

[0136] Although not shown, a second flow path communicating with the second accommodation space 27 is provided on the housing 10. In the housing 10, the first flow path and the second flow path are not connected. That is, the fluid supply through the first flow path and the fluid supply through the second flow path can be performed independently.

[0137] The compensation hole 46 communicates with the second accommodation space 27. Therefore, the fluid supplied to the compensation chamber 450 is supplied to the compensation chamber 450 through the second flow path 11, the second accommodation space 27, and the compensation hole 46.

[0138] The input shaft bearing 34, the projection bearing 47, and the hub shaft bearing 22 are arranged in the second accommodation space 27, and the first clutch assembly 38 is also arranged. Flow path holes may be formed in the input member 30 so that the fluid fills the second accommodation space 27 through the second flow path. Therefore, the fluid supplied through the second flow path fills the second accommodation space 27 for lubricating and cooling the bearings, the first clutch assembly 38, and the rotor 52.

[0139] If the pressure of the fluid supplied through the first flow path exceeds the pressure of the fluid supplied through the second flow path and the elastic force of the return spring 48, the piston plate 43 pressurizes the first clutch assembly 38, otherwise, the piston plate 43 relieves the pressure on the first clutch assembly 38.

[0140] The piston plate 43 and the compensation plate 45 rotate together with the hub projection 40, and the hub projection 40 is connected to the rotor hub 20 to be rotationally restricted. Accordingly, the piston plate 43 and the compensation plate 45 rotate together with the rotor hub 20.

[0141] A rear cover 55 that defines the rear boundary of a specified first accommodation space 26 is connected to the rear end of the axially extending portion 24. The rear cover 55 is integrally fixed to the rear end of the axially extending portion 24 by a fastening unit such as welding or bolts. In an embodiment, an example is shown in which the rear cover 55 is integrated with the rotor hub 20 by welding.

[0142] An output member 80 and a power transmission portion that transmits the rotational force of the rotor hub 20 to the output member 80 can be accommodated in the first accommodation space 26 of the rotor hub 20.

[0143] The power transmission portion may include a fluid clutch connected to the rotor hub 20 and a second clutch assembly 71 connected to the rotor hub 20.

[0144] The fluid clutch may be a torque converter 60. That is, the fluid clutch may include semi-circular annular impellers 61 and turbines 62 facing each other, and a reactor 64 disposed between the impeller and the turbine and connected to a fixed end 65 by a one-way clutch 67.

[0145] The impeller 61 may be disposed on the rear cover 55. Accordingly, the impeller 61 and the rotor hub 20 are rotationally restricted.

[0146] A pump drive hub 56 extending rearward is provided on the radially inner side of the rear cover 55.

[0147] The fixed end 65 is disposed in front of and radially inside the pump drive hub 56, and a cover bearing 57 may be interposed therebetween. The cover bearing 57 may be a thrust bearing.

[0148] The output member 80 is disposed in front of and radially inside the fixed end 65, and a bearing 88 may be interposed therebetween. The bearing 88 may be a thrust bearing.

[0149] When the rotor hub 20 rotates, its rotational force drives the pump through the rear cover 55 and the pump drive hub 56, and then supplies transmission oil to the first accommodation space 26 through the space between the output member 80 and the fixed end 65. Therefore, the first accommodation space 26 is filled with fluid for the operation of the fluid clutch, the cooling of the second clutch assembly 71, and the lubrication of the bearings. The oil flowing into the first accommodation space 26 can flow out to the transmission through the space between the fixed end 65 and the rear cover 55. During the circulation of the fluid, the second clutch assembly 71, the one-way clutch 67, the cover bearing 57, and the bearing 88 can be lubricated and cooled.

[0150] The turbine 62 is opposite to the impeller 61 and is located in front of the impeller 61. The radially inner side of the turbine plate 63 on which the turbine 62 is mounted is connected to the output member 80. The output member 80 is connected to the input of the transmission.

[0151] A reactor 64 is disposed between the impeller 61 and the turbine 62. The reactor 64 is mounted on the fixed end 65 through a one-way clutch 67. The reactor 64 rotates relative to the rear cover 55 and also rotates relative to the output member 80. In order to allow the relative rotation between the rear cover 55 and the reactor 64, and the relative rotation between the output member 80 and the reactor 64, and to support their mutual rotation, the cover bearing 57 is interposed between the reactor 64 and the rear cover 55, and the bearing 88 is interposed between the reactor 64 and the output member 80. That is, the output member 80 and the rear cover 55 are rotatably supported by the fixed end 65.

[0152] In a state where there is a speed difference between the rotor hub 20 and the output member 80, the rotational power of the motor and / or the engine can be transmitted to the output member 80 through the torque converter 60.

[0153] A lock-up clutch 70 is disposed in front of the turbine plate 63 in the first accommodation space 26. The lock-up clutch 70 has a second clutch assembly 71, and a plurality of friction plates are axially disposed in the second clutch assembly 71.

[0154] The second clutch assembly 71 connects or disconnects the connection between the rotor hub 20 and the output member 80 between the rotor hub 20 and the output member 80.

[0155] The plurality of second clutch assemblies 71 are arranged in such a form that the friction plates connected to the first rotor-side bracket 251 provided on the inner circumferential surface of the axially extending portion 24 of the rotor hub 20 on the radially outer side and the friction plates connected to the output member 80 through the output-side bracket 72 on the radially inner side are alternately arranged axially.

[0156] The first rotor-side bracket 251 may be disposed at a position radially more outward than the output-side bracket 72. That is, the output-side bracket 72 may be located at a position radially more inward than the first rotor-side bracket 251.

[0157] In the embodiment, a structure is illustrated in which the first rotor-side bracket 251 is integrally formed on the inner peripheral surface of the axial extension portion 24. However, the first rotor-side bracket 251 may be a structure that is first manufactured as a separate member and then connected to the rotor hub 20.

[0158] The second clutch assembly 71 is connected to the output-side bracket 72 on its radial inner side, and the output-side bracket 72 can be connected to the output member 80 in a form fixed to the output member 80.

[0159] A piston member 75 for pressurizing or decompressing the second clutch assembly 71 is provided in the first accommodation space 26.

[0160] The piston member 75 has a shape extending radially, and has a first surface (rear surface) facing either axial direction and a second surface (front surface) facing the opposite direction. That is, the first surface and the second surface are back-to-back (opposite).

[0161] The piston member 75 is disposed behind the radial extension portion 23 and in front of the lock-up clutch 70. Therefore, the first surface is configured to face the second clutch assembly 71 and the torque converter side. And, the second surface faces the radial extension portion 23.

[0162] The radially inner end of the piston member 75 is slidably in contact with the outer peripheral surface of the output member 80. The radially outer end of the piston member 75 is slidably in contact with the inner peripheral surface of the axial extension portion 24.

[0163] The radial extension portion 23 and the piston member 75 define a second working chamber 750 for the piston member 75. The second surface of the piston member 75 faces the second working chamber 750.

[0164] The output member 80 has a hollow shaft shape. And, an output spline 81 connected to the input of the transmission is formed on the inner peripheral surface of the hollow shaft shape. A flow path for supplying fluid to the second working chamber 750 is formed in the hollow portion of the output member 80. A gasket 89 is interposed between the output member 80 and the radially extending portion 23 to maintain the gap therebetween and allow fluid movement. The flow path communicates with the second working chamber 750 through the space between the output member 80 and the radially extending portion 23. Therefore, the transmission oil supplied through the flow path can flow into the second working chamber 750. When the pressure in the second working chamber 750 is higher than the pressure in the first accommodation space 26, the piston member 75 moves backward, the lock-up clutch 70 operates, and the rotational power of the rotor hub 20 can be transmitted to the output member 80 through the lock-up clutch 70. When the pressure in the second working chamber 750 is lower than the pressure in the first accommodation space 26, the piston member 75 moves forward and releases the lock-up clutch 70.

[0165] The rotor hub 20 is integrally connected to the rear cover 55. Therefore, the axial distance between the radially extending portion 23 and the rear cover 55 is kept constant.

[0166] The output member 80 is supported forward by the gasket 89 and the radially extending portion 23. The output member 80 is supported backward by the bearing 88 and the fixed end 65. Here, the bearing 88 can be a thrust bearing. The central axis of the output member 80 is aligned with the rotor hub 20 through the piston member 75.

[0167] The fixed end 65 is supported forward by the bearing 88 and the output member 80. The fixed end 65 is supported backward by the cover bearing 57 and the rear cover 55. Here, the cover bearing 57 can be a thrust bearing.

[0168] Therefore, the axial positions of the output member 80 and the fixed end 65 in the first accommodation space 26 are restricted by the rotor hub 20 and the rear cover 55.

[0169] The rotor 52, the rotor hub 20, the torque converter 60 disposed in the first accommodation space 26, the fixed end 65, the output member 80, the lock-up clutch 70, and the piston member 75, and the first clutch assembly 38 disposed in the second accommodation space 27 are all rotating members and are axially constrained to maintain their axial positions relative to each other.

[0170] On the other hand, the housing 10 and the stator 51 mounted therein are all non-rotating fixed members.

[0171] In an embodiment, the following structure is illustrated: the rotor hub 20 and the hub projection 40 are integrally formed by being constrained in both axial directions, the radial direction, and the circumferential direction, the hub projection 40 is rotatably connected to the housing 10 by being constrained in both axial directions and the radial direction, the input member 30 and the input-side bracket 33 are rotatably connected to the housing 10 by being constrained in both axial directions and the radial direction, and the input member 30 is rotatably connected to the rotor hub 20 by being constrained in the radial direction.

[0172] Next, the above structure and the assembly method of the hybrid drive module having the above structure will be described in detail.

[0173] [Structure for assembling the housing, hub projection, and rotor hub]

[0174] To improve the convenience of assembly, an embodiment provides a hybrid drive module, which is assembled by fixing the hub projection 40 to the rotor hub 20 in a state where the housing 10, the hub projection 40, and the input member 30 are first assembled.

[0175] It may be a state where the stator 51 is fixed to the housing 10 before the hub projection 40 is fixed to the rotor hub 20.

[0176] Before the hub projection 40 is fixed to the rotor hub 20, the hub projection 40 may be first connected to the housing 10.

[0177] A piston plate 43, a return spring 48, and a compensation plate 45 can be installed on the hub projection 40. This assembly, that is, the assembly of the hub projection assembly, can be performed before the hub projection 40 is connected to the housing 10. Of course, the hub projection assembly can also be assembled after the hub projection 40 is connected to the housing 10.

[0178] When the hub projection 40 is connected to the housing 10, it is connected through a raised bearing 47.

[0179] The space defined by the inner circumference of the piston setting portion 42 of the hub projection 40 opens forward. In addition, there is a portion on the inner circumference of the piston setting portion 42 where an inward step is provided at the rear and the inner diameter decreases.

[0180] The housing 10 extends rearward inside the radial direction compared to the hub projection 40. An outward step with an enlarged outer diameter is provided in front of the outer peripheral surface of the extending portion.

[0181] First, the outer ring of the front protruding bearing 47 of the hub protrusion 40 contacts the inner circumference of the piston setting portion 42 of the hub protrusion 40, and the protruding bearing 47 is inserted until the rear of the outer ring contacts the inward step of the piston setting portion 42. And, a snap ring is inserted into the inner circumference of the piston setting portion 42 in front of the outer ring to restrict the outer ring of the protruding bearing 47 in both the front and rear directions.

[0182] Thus, in a state where the protruding bearing 47 is restricted by the hub protrusion 40, the inner ring of the protruding bearing 47 contacts the outer peripheral surface of the extension portion of the housing 10 from the rear of the housing 10, and the protruding bearing 47 is inserted until the front of the inner ring contacts the outward step of the extension portion. And, a snap ring is inserted into the outer circumference of the extension portion behind the inner ring to restrict the inner ring of the protruding bearing 47 in both the front and rear directions.

[0183] Thus, in a state where the hub protrusion 40 is assembled to the housing 10 through the protruding bearing 47, the hub protrusion 40 is fixed to the axial extension portion 24 of the rotor hub 20. At this time, in order to approach the coupling portion of the axial extension portion 24 of the rotor hub 20 and the hub protrusion 40 from the front of the housing 10, an assembly hole 12 is formed at a position axially opposite to the coupling portion of the protruding portion fixing member 49 and the hub protrusion 40 in the housing 10. A sealing cover 13 for isolating the internal space and the external space of the housing 10 is detachably inserted into the assembly hole 12.

[0184] In the embodiment, it is disclosed that the assembly hole 12 is circular. However, the shape of the assembly hole 12 can be various. Considering the sealing structure of the sealing cover 13, the assembly hole 12 and the sealing cover 13 are preferably circular.

[0185] One or more than two assembly holes 12 can be provided in the circumferential direction. When a plurality of assembly holes 12 are provided, it is convenient to operate the protruding fixing member 49 through the assembly holes 12, but since the sealing cover 13 must be assembled to each assembly hole 12, the number of parts increases. In the embodiment, a housing structure with one assembly hole 12 is proposed. When the protruding snap ring 49 is used as the protruding fixing member, even if there is only one assembly hole 12, it is not inconvenient to use the protruding fixing member.

[0186] The assembly hole 12 is arranged in front of the axial extension portion 24 of the rotor hub 20. Therefore, the operator can fix the protruding snap ring 49 to the rotor hub 20 by clamping it with a jig through the assembly hole 12 from the front of the housing 10. At this time, the rotor hub 20 can be in a state of a rotor hub assembly in which the rotor 52, the first clutch assembly 38, the lock-up clutch 70, the piston member 75, the output member 80, the torque converter 60, the fixed end 65, and the rear cover 55 are pre-assembled.

[0187] The raised snap ring 49 must be arranged in front of the hub projection 40. However, the diameter of the raised snap ring 49 is smaller than the diameter of the hub projection 40. Therefore, before assembling the hub projection 40 to the housing 10, it is preferable to assemble the hub projection 40 to the housing 10 with the raised snap ring 49 arranged between the housing 10 and the hub projection 40.

[0188] If the hub projection 40 and the housing 10 are assembled with the raised snap ring 49 arranged in advance between them, the raised snap ring 49 will be in a state of not being fixed at any position. At this time, it may be inconvenient when operating the raised snap ring 49 through the assembly hole 12 subsequently.

[0189] To solve this inconvenience, the outer diameter of the centrifugal end portion of the hub projection 40 can be made larger than the inner diameter of the raised snap ring 49. Then, first place the raised snap ring 49 between the housing 10 and the hub projection 40, and assemble the housing 10 and the hub projection 40. Then, the raised snap ring 49 can be prevented from separating backward from the pre-assembled components. That is, the axial position of the raised snap ring 49 is restricted to a certain extent.

[0190] A protruding portion 411 that protrudes forward can be provided at the centrifugal end portion of the hub projection 40. And, the inner diameter of the protruding portion 411 can be larger than the outer diameter of the raised snap ring 49. Thus, the centers of the raised snap ring 49 and the hub projection 40 can be temporarily aligned, and the work of assembling the raised snap ring 49 through the assembly hole 12 can be performed more easily. That is, the radial position of the raised snap ring 49 is restricted to a certain extent.

[0191] The hybrid drive module may further include an input member 30 that connects the engine and the engine clutch 37 therebetween. The input member 30 is a member that can rotate relative to the housing 10 and can rotate relative to the rotor hub 20.

[0192] Therefore, in order to enable the input member 30 to rotate relative to the rotor hub 20, a hub shaft bearing 22 is interposed between the outer peripheral surface of the hub shaft 21 of the rotor hub 20 and the inner peripheral surface of the input member 30 facing it. In addition, in order to enable the input member 30 to rotate relative to the housing 10, an input shaft bearing 34 is interposed between the inner peripheral surface of the housing 10 and the outer peripheral surface of the input member 30 facing it.

[0193] The housing 10 is accurately aligned with the central axis of the rotor hub 20, and the input shaft bearing 34 and the hub shaft bearing 22 are arranged at an axial interval. Therefore, the central axis of the input member 30 can also be accurately aligned with the central axes of the housing 10 and the rotor hub 20.

[0194] When hydraulic pressure is supplied to the first working chamber 430 through the housing 10, the piston plate 43 pushes the first clutch assembly 38 backward. Therefore, the rotor hub 20 is subjected to a force in the direction away from the hub projection 40, that is, a force toward the rear. However, since the rotor hub 20 is fixed to the hub projection 40, the hub projection 40 is also subjected to a force toward the rear. At this time, the second bearing snap ring 422 pushes the outer ring of the projection bearing 47 backward. Since the rear of the inner ring of the projection bearing 47 is supported by the first bearing snap ring 15, the hub projection 40 can be axially supported by the housing 10. That is, the housing 10 supports the rotor hub assembly through the projection bearing 47 so that the rotor hub assembly can rotate relative to the housing 10 while preventing the rotor hub assembly from moving backward.

[0195] The projection bearing 47 can also prevent the rotor hub assembly from moving forward. When the rotor hub assembly is subjected to a force toward the housing 10 forward, the inward step of the piston setting portion 42 of the hub projection 40 pushes the outer ring of the projection bearing 47 forward, but the outward step of the housing 10 interferes with the inner ring in front of the inner ring of the projection bearing 47, thereby preventing the inner ring from moving forward.

[0196] The input member 30 also rotates relative to the housing 10 and also rotates relative to the rotor hub 20 to the hub projection 40. Therefore, the axial position of the input member 30 must also be restricted relative to these members.

[0197] If only one of the hub shaft bearing 22 and the input shaft bearing 34 restricts the forward and backward movement of the input member 30 in the axial direction, or only one of the hub shaft bearing 22 and the input shaft bearing 34 restricts the forward movement of the input member 30 and the other restricts the backward movement of the input member 30, the input member 30 can restrict the axial position with respect to both the housing 10 and the rotor hub 20.

[0198] When it is designed that the input shaft bearing 34 restricts the forward movement of the input member 30 and the hub shaft bearing 22 restricts the backward movement of the input member 30, since the snap ring can be omitted, the assembly is more convenient. However, both the input shaft bearing 34 and the hub shaft bearing 22 must be composed of bearings such as ball bearings so that they can support not only radial rotation but also axial rotation.

[0199] On the other hand, when one of the input shaft bearing 34 or the hub shaft bearing 22 restricts both the forward and backward movement of the input member 30, the other bearing can only have the function of supporting radial rotation.

[0200] In order to enable the hub shaft bearing 22 to limit the axial position between the input member 30 and the rotor hub 20, snap rings for axially supporting the inner and outer rings of the hub shaft bearing 22 must be installed respectively. However, the operation of installing the snap rings in the state where the input member 30 is inserted into the rotor hub 20 is not simple, and the disassembly process is even more difficult.

[0201] Therefore, in the embodiment, a manner in which the input shaft bearing 34 restricts both the forward and backward axial movement of the input member 30 is illustrated. Specifically, a structure is disclosed in the embodiment, in which the input shaft bearing 34 is a ball bearing with both the outer ring and the inner ring restricted in the front-rear direction, and the hub shaft bearing 22 is a needle bearing that provides only a rotational support surface in the radial direction.

[0202] The inner peripheral surface of the housing 10 is provided with an inward step, such that the inner diameter in the front is larger than that in the rear. And, on the outer peripheral surface of the input member 30 opposite to the inward step in the radial direction, an outward step is provided, such that the outer diameter in the rear is larger than that in the front.

[0203] In addition, an input-side bracket 33 that extends radially is integrally connected to the rear end portion of the input member 30. That is, the input member 30 is configured to be inserted from the rear of the housing 10 to the front.

[0204] And, it is inserted such that the outer ring of the input shaft bearing 34 contacts the inner peripheral surface of the housing 10, and the rear surface of the outer ring contacts the front surface of the inward step, and the inner ring of the input shaft bearing 34 contacts the outer peripheral surface of the input member 30, and the rear surface of the inner ring contacts the front surface of the outward step.

[0205] In the state where the input shaft bearing 34 is inserted in this way, a snap ring is installed on the inner peripheral surface of the housing 10 in front of the outer ring of the input shaft bearing 34, and a snap ring is installed on the outer peripheral surface of the input member 30 in front of the inner ring, so that the input member 30 is centered with respect to the housing 10, the axial position is restricted, and it can rotate.

[0206] During the assembly process, the input member 30 can be first assembled to the hub shaft 21 through the hub shaft bearing 22, and then, during the process of assembling the hub projection 40 to the rotor hub 20, it is assembled to the housing 10 through the input shaft bearing 34.

[0207] Alternatively, differently, the input member 30 can also be assembled to the housing 10 with the hub projection 40 pre-assembled through the input shaft bearing 34, and then, during the process of connecting the hub projection 40 to the rotor hub 20, the input member 30 is connected to the hub shaft 21 through the hub shaft bearing 22.

[0208] With the input shaft bearing 34 installed between the input member 30 and the housing 10, a sealing ring 14 can be inserted in front thereof. The sealing ring 14 is used to seal between the inner peripheral surface of the housing 10 and the outer peripheral surface of the input member 30.

[0209] In addition, if only one of the hub shaft bearing 22 and the input shaft bearing 34 restricts the forward and backward movement of the input member 30 in the axial direction, or one of the hub shaft bearing 22 and the input shaft bearing 34 restricts the forward movement of the input member 30, while the other restricts the backward movement of the input member 30, the axial position limitation of the rotor hub 20 relative to the housing 10 is not performed by the input shaft bearing 34, the input member 30, and the hub shaft bearing 22.

[0210] However, according to the present invention, since the raised bearing 47 has restricted the axial position of the rotor hub 20 relative to the housing 10, even if the input member 30 does not restrict the axial position between the housing 10 and the rotor hub 20, there is no problem.

[0211] That is, according to the present invention, the hybrid drive module is easy to assemble and disassemble, and even when the pressure in the first working chamber 430 rises, the raised bearing 47 axially supports the rotor hub 20, so the connection between the rotating member and the fixed member is firm.

[0212] In addition, the capacity of the hub shaft bearing 22 can be reduced and it can be designed as a radial bearing, so that not only the cost can be reduced, but also a more compact design in the axial direction can be achieved.

[0213] As described above, although the present invention has been described with reference to the accompanying drawings of the exemplary embodiments, it should be understood that the present invention is not limited to the embodiments and the drawings disclosed in this specification, and those of ordinary skill in the art can make various modifications within the scope of the technical concept of the present invention. At the same time, even if the effects of the structure according to the present invention are not explicitly described when describing the embodiments of the present invention, the effects that can be predicted by this structure should also be recognized.

Claims

1. A hybrid drive module, which is disposed between an engine and a transmission in a power system and provides power to the transmission, and includes a motor (50), comprising: A housing, on which a stator (51) is fixed; A rotor hub (20), which is axially disposed behind the housing (10) and fixed with a rotor (52); A hub projection (40), which is disposed between the housing (10) and the rotor hub (20) and is rotationally constrained and connected to the rotor hub (20) on the radially outer side; A projection bearing (47), which is disposed between the hub projection (40) and the housing (10) and connects the hub projection (40) and the housing (10) such that the hub projection (40) can rotate relative to the housing (10); And A projection fixing member (49), which is detachably coupled to the rotor hub (20) to limit the forward movement of the hub projection (40) relative to the rotor hub (20), The projection bearing (47) radially aligns the hub projection (40) with the housing (10) and mutually constrains them in two axial directions, In the housing (10), an assembly hole (12) is provided at a position axially opposite to the coupling part of the projection fixing member (49) and the hub projection (40).

2. The hybrid drive module according to claim 1, wherein, One or more than two assembly holes (12) are provided on the housing (10) in the circumferential direction.

3. The hybrid drive module according to claim 1, wherein, A sealing cover (13) for sealing the assembly hole (12) is detachably provided in the assembly hole (12).

4. The hybrid drive module according to claim 1, wherein, The projection fixing member (49) includes a projection snap ring (49), and the projection snap ring is inserted into a card slot (242) that radially depresses from the front of the hub projection (40) to the rotor hub (20).

5. The hybrid drive module according to claim 4, wherein, The rotor hub (20) has an axially extending portion (24) for fixing the rotor (52), The card slot (242) is provided on the outer peripheral surface or the inner peripheral surface of the axially extending portion (24).

6. The hybrid drive module according to claim 5, wherein, The rotor (52) is disposed radially outside the axially extending portion (24), The centrifugal end portion of the hub projection (40) is disposed in front of the rotor (52), An elastic gasket (28) that elastically deforms axially is interposed axially between the hub projection (40) and the rotor (52).

7. The hybrid drive module according to claim 4, wherein, The outer diameter of the centrifugal end portion of the hub projection (40) is larger than the inner diameter of the projection snap ring (49).

8. The hybrid drive module according to claim 4, wherein, A protruding portion (411) protruding forward is provided at the centrifugal end portion of the hub projection (40).

9. The hybrid drive module according to claim 8, wherein, The inner diameter of the protruding portion (411) is larger than the outer diameter of the projection snap ring (49).

10. The hybrid drive module according to claim 1, wherein, Finger portions (241) that extend forward from the rotor hub (20) and are circumferentially spaced apart are provided in front of the rotor hub (20), A hub coupling portion (41) through which the finger portions (241) axially penetrate is provided on the hub projection (40), With the finger portion (241) passing through the hub coupling portion (41), the finger portion (241) interferes with the hub projection (40) in the circumferential direction, restricting the rotation of the hub projection (40) relative to the rotor hub (20).

11. The hybrid drive module according to claim 10, wherein, The hub coupling portion (41) is in the form of a hole penetrating axially or a groove penetrating axially and opening in the centrifugal direction.

12. The hybrid drive module according to claim 1, wherein, On either the radially outer or inner side of the projection bearing (47), one side is supported by the housing (10) and the other side is supported by the hub projection (40). On either the front or rear side of one side of the projection bearing (47), one side is supported by the housing (10) and the other side is supported by the first bearing snap ring (15) coupled to the housing (10). On either the front or rear side of the other side of the projection bearing (47), one side is supported by the hub projection (40) and the other side is supported by the second bearing snap ring (422) coupled to the hub projection (40).

13. The hybrid drive module according to claim 12, wherein, The radially outer side of the projection bearing (47) is supported by the hub projection (40) and the inner side is supported by the housing (10). The front of the radially inner side of the projection bearing (47) is supported by the housing (10) and the rear is supported by the first bearing snap ring (15).

14. The hybrid drive module according to claim 13, wherein, The rear of the radially outer side of the projection bearing (47) is supported by the hub projection (40) and the front is supported by the second bearing snap ring (422).

15. The hybrid drive module according to claim 1, wherein, A piston plate (43) is provided behind the hub projection (40), and the piston plate (43) is slidably provided on the hub projection (40) in the axial direction.

16. The hybrid drive module according to claim 15, wherein, It further includes a compensation plate (45), which is mounted on the hub projection (40) behind the piston plate (43) and is slidably connected to the piston plate (43).

17. The hybrid drive module according to claim 15, wherein, It further includes an engine clutch (37), which is axially arranged between the piston plate (43) and the rotor hub (20) and selectively transmits the power of the engine to the rotor hub (20).

18. The hybrid drive module according to claim 17, wherein, It further includes: An input member (30) that connects the engine and the engine clutch (37) between the engine and the engine clutch; A hub shaft bearing (22) that connects the input member (30) and the rotor hub (20) so that the input member (30) can rotate relative to the rotor hub (20); and An input shaft bearing (34) that connects the input member (30) and the housing (10) so that the input member (30) can rotate relative to the housing (10). The hub shaft bearing (22) radially aligns the input member (30) and the rotor hub (20). The input shaft bearing (34) radially aligns the input member (30) and the housing (10). Among the hub shaft bearing (22) and the input shaft bearing (34), only the first bearing selected restricts the input member (30) from moving forward. Only the second bearing selected from the hub shaft bearing (22) and the input shaft bearing (34) restricts the input member (30) from moving rearward.

19. The hybrid drive module according to claim 18, wherein, The first bearing and the second bearing are the same bearing.

20. The hybrid drive module according to claim 19, wherein, The first bearing and the second bearing are different bearings.

21. The hybrid drive module according to claim 18, wherein, The hub shaft bearing (22) is disposed between the input member (30) and the rotor hub (20).

22. The hybrid drive module according to claim 18, wherein, The input shaft bearing (34) is disposed between the input member (30) and the housing (10).

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