CN113738787A

CN113738787A - Input disc support for a dual wet clutch, clutch system and mechanism comprising such a disc support and hybrid transmission chain

Info

Publication number: CN113738787A
Application number: CN202110907154.9A
Authority: CN
Inventors: A.多尔; F.蒂鲍特
Original assignee: Valeo Embrayages SAS
Current assignee: Valeo Embrayages SAS
Priority date: 2016-12-21
Filing date: 2017-12-13
Publication date: 2021-12-03
Anticipated expiration: 2037-12-13
Also published as: CN113738787B; CN110268177A; KR20190099257A; KR102471296B1; FR3060682B1; CN110268177B; FR3060682A1; EP3559492A1; WO2018114549A1

Abstract

The invention relates to a one-piece input disc carrier (34) for a dual wet clutch mechanism (18), comprising: a cylindrical guide bearing surface (36) for guiding the bearing (38) for guiding the input disc carrier (34) to rotate about a reference axis (100) of the input disc carrier (34); a first clutch region (42) comprising a first set of axially directed input teeth (46) facing radially towards the reference axis (100) and located at a first radial distance from the reference axis (100); and a second clutch region (44) including a second set of axially directed input teeth (58) facing radially toward the reference axis (100) and located a second radial distance from the reference axis (100), the second radial distance being shorter than the first distance. The input disc carrier (34) also includes a ring gear (88).

Description

Input disc support for a dual wet clutch, clutch system and mechanism comprising such a disc support and hybrid transmission chain

The application is a divisional application of an invention patent application with application date of 2017, 12 and 13 and application number of 201780084977.8.

Technical Field

The invention relates to a dual wet clutch for a hybrid powertrain. It also relates to an input disc carrier for such a dual wet clutch.

Background

Document US2015083546 describes a hybrid drive comprising an internal combustion engine and a clutch system comprising a double wet clutch and a reversible electric machine, the rotor of which is fixed to the input disc carrier of the double wet clutch and surrounded by a stator. This architecture requires a large diameter motor, which is particularly expensive and at least its rotor is located within the oil sump containing the dual wet clutch.

Disclosure of Invention

The present invention aims to overcome the drawbacks of the prior art and to propose a device that allows a less restrictive connection between the electric machine and the double wet clutch, for example making it possible to use a small-diameter electric machine or an electric machine that is not coaxial with the double wet clutch.

To this end, a first aspect of the invention proposes a one-piece input disc carrier for a dual wet clutch mechanism, comprising a guiding cylindrical bearing surface for a bearing for guiding rotation of the input disc carrier about a reference axis of the input disc carrier, a first clutch region comprising a first set of axially guiding input teeth radially facing the reference axis and located at a first radial distance from the reference axis, a second clutch region comprising a second set of axially guiding input teeth radially facing the reference axis and located at a second radial distance from the reference axis shorter than the first distance, characterized in that said input disc carrier further comprises a ring gear comprising meshing teeth distributed circumferentially. The ring gear is intended to mesh with a pinion, toothed belt or chain for connection with a motor, which may thus be offset from the reference axis of the input disc carrier. It is thus possible to envisage an electric motor having a rotation axis parallel to and at a distance from the reference axis, or an electric motor having a rotation axis not parallel to the reference axis, for example lying in a plane perpendicular to the reference axis.

Preferably, the first clutch region radially outside the second clutch region overlaps the second clutch region.

In practice, and according to a preferred embodiment, the ring gear comprises a continuous ring of material on which a set of teeth is mounted. According to an embodiment, the teeth are intended to mesh with the pinion. According to another embodiment, the teeth are capable of meshing with a toothed belt. According to another embodiment, the teeth are capable of meshing with a chain.

According to one embodiment, the teeth are straight cut (spur) gear teeth. Alternatively, according to a preferred embodiment, the ring gear has helical gear teeth. Such teeth have the significant advantage of not being very noisy.

According to an embodiment, the meshing teeth of the ring gear are radially outward with respect to the reference axis. This arrangement provides a great degree of freedom in the positioning of the connection between the ring gear and the motor. However, the opposite arrangement with teeth facing radially towards the reference axis is equally possible.

According to an embodiment, the ring gear is located radially outside and radially outward of the first clutch region. The ring may in particular axially overlap the first clutch region and, where applicable, the second clutch region. This arrangement would be preferred when there is not much axial space available between the input disc carrier and the clutch control.

According to another embodiment, the ring gear is axially offset with respect to the first clutch region. More specifically, to increase compactness in the radial direction, the ring gear does not axially overlap the first clutch region. The diameter of the ring gear is then independent of the diameter of the first clutch region. Preferably, the ring gear also does not axially overlap the second clutch region.

Preferably, the meshing teeth have free ends that are closer to the reference axis than the first clutch region.

Preferably, the ring gear can be located in particular between the first clutch region and the second clutch region.

According to an embodiment, the input disc carrier has a transverse wall extending radially at least from the guide bearing surface to the first clutch region, the ring gear being located on an opposite side of the transverse wall to the first and second clutch regions. In practice, the transverse wall comprises one or more first openings for inserting the lugs of the first force-transmitting member for controlling the clutch disc in the first clutch region, and one or more second openings for inserting the lugs of the second force-transmitting member for controlling the clutch disc in the second clutch region.

In practice, the input disc holder comprises a connecting arm connecting the transverse wall and the ring gear. The connecting arms may be distributed around a reference axis of the input disc holder and form an opening. These openings allow the passage of the lugs of the first force transmission member, if applicable, and the passage of the lugs of the second force transmission member, if applicable. The connecting arm may have ribs and/or reinforcements. These ribs or stiffeners allow, where applicable, the transmission of very high torques provided by the motor.

The guide support surface may face radially outwardly, but preferably faces radially inwardly.

According to another aspect of the invention, the invention relates to a subassembly consisting of an input disc carrier and a rotary guide bearing shrink-fitted or fixed to a guide support surface by any other means. The guide bearing may in particular be a rolling contact bearing, for example an angular contact ball bearing. For some applications, it may be advantageous to select a rolling bearing capable of withstanding bi-directional axial loads, such as a deep groove ball bearing. This is particularly true if the teeth of the ring gear are helical gear teeth.

According to another aspect of the invention, the invention relates to a dual wet clutch mechanism comprising:

-an input disc holder as described above,

an input flange rotating together with the input disc holder,

a first output flange comprising a first set of axially directed output teeth located facing and at a distance from the first set of input teeth, and a first interface for rotational attachment to a first input shaft of the gearbox,

a second output flange comprising a second set of axially directed output teeth located facing and at a distance from the second set of input teeth, and a second interface for rotational attachment to a second input shaft of the gearbox,

a first multi-plate clutch assembly located between the first set of input teeth and the first set of output teeth,

-a second multi-plate clutch assembly located between the second set of input teeth and the second set of output teeth.

The first set of output tines is preferably located between the first and second sets of input tines. The first multi-plate clutch assembly is preferably located radially outward of the second multi-plate clutch assembly.

According to another aspect of the invention, the invention relates to a dual wet clutch system comprising: the dual wet clutch mechanism and clutch control as described above includes a first annular actuator, a second annular actuator located radially inward of the first annular actuator, a first force transfer member that transfers force from the first actuator to the first multi-plate clutch assembly through one or more first passage openings in the input disc carrier, and a second force transfer member that transfers force from the second actuator to the second multi-plate clutch assembly through one or more second passage openings in the input disc carrier. The two actuators are coaxial. The two actuators may be axially positioned to overlap each other, with the first actuator surrounding the second actuator.

According to an embodiment, the first force transmitting member and the second force transmitting member extend between the input disc carrier and the ring gear. The ring gear is axially offset relative to the first and second force transfer members.

According to an embodiment, the ring gear is located radially outside the first ring actuator.

According to an embodiment, the first actuator is axially offset towards the input disc carrier with respect to the second actuator. This arrangement makes it possible to utilize the available volume constituted by the recess in the gearbox housing surrounding the opening through which the gearbox input shaft passes. The first force transmission member is preferably arranged radially outside the second force transmission member. According to an embodiment, the force transmitting member extends axially between the first and second clutch regions and the ring gear.

Preferably, a guide bearing is provided which is shrink fitted or fixed to the guide support surface by any means and provides rotational guidance to the clutch mechanism relative to the body common to the first and second annular actuators. It is also conceivable that the guide bearing is mounted between one of the input disc carrier and the gearbox input shaft or a component fixedly attached to one of the gearbox input shafts.

According to an embodiment which is particularly compact and compatible with small diameter ring gears, the connecting arm of the input disc carrier passes through an opening formed by the first force transmitting member. If it is desired to further reduce the diameter of the ring gear, it can be provided that the connecting arm of the input disc carrier passes through an opening formed in the second force transmission member.

According to another aspect of the invention, the invention relates to a hybrid powertrain comprising an electric motor and a dual wet clutch mechanism or dual clutch system as described above and a kinematic connection between the electric motor and the ring gear. The motor may advantageously be reversible and allow for the generation of electrical power when operating under load. Preferably, the kinematic connection comprises a gear, a toothed belt or a chain meshed with a ring gear.

Drawings

Other features and advantages of the invention will become apparent upon reading the following description and upon reference to the drawings in which:

FIG. 1: a hybrid propulsion assembly according to the present invention, comprising an input disc carrier according to a first embodiment of the present invention;

-figure 2: an isometric view of a disc holder according to a first embodiment of the invention;

-figure 3: a disk holder according to a second embodiment of the present invention;

-figure 4: a disk holder according to a third embodiment of the present invention; and

-figure 5: a disc holder according to a fourth embodiment of the present invention.

For purposes of clarity, the same reference numbers will be used throughout the drawings to identify the same or similar elements.

Detailed Description

Fig. 1 shows a hybrid powertrain 10 between a first electric motor 12 (in this case an internal combustion engine) and two in-line

gearbox input shafts

22, 24, the hybrid powertrain comprising a reversible electric machine forming a second electric motor 14, a clutch system 16 comprising a dual wet clutch mechanism 18 and a clutch control 20, the dual wet clutch mechanism 18 rotating about a reference axis 100, the reference axis 100 also being the axis of the two

shafts

22, 24.

The hybrid powertrain 10 may include a first kinematic connection 28 for connecting the first electric motor 12 to the input flange 26 of the dual wet clutch mechanism 18, which first kinematic connection 28 may suitably include a mechanism 30 for filtering torque fluctuations, such as a dual mass flywheel, and a coupling clutch 32.

The input flange 26 rotates integrally with the input disc carrier 34 of the dual wet clutch 18. The input disc carrier 34 is a one-piece component suitably obtained by welding together several pressed metal plates, and comprises a guide cylindrical bearing surface 36 facing the reference axis 100 for guiding a rolling bearing 38, a transverse wall 40 extending radially from the guide bearing surface 36 to an outer skirt forming a first clutch zone 42, and an inner skirt forming a second clutch zone 44, the second clutch zone 44 being located radially inside the first clutch zone 42. The two

clutch regions

42, 44 are axially located on the same side of the transverse wall 40.

The first clutch region 42 of the input disc carrier is provided with a first set of input teeth 46 facing radially towards the reference axis 100. The dual wet clutch mechanism 18 further includes a first output flange 48, the first output flange 48 including a first set of output teeth 50 and a first interface 52, the first set of output teeth 50 being located facing and at a distance from the first set of input teeth 46, the first interface 52 for rotational attachment to the first input shaft 22 of the gearbox. A first multi-plate clutch assembly E1, including a first set of input plates 54 and a first set of output plates 56, is received in an annular volume radially defined by the first clutch region 42 and the first output flange 48 of the input plate carrier 34. The discs of the first set of input discs 54 are meshed with the first set of input teeth 46 for rotation therewith, but are capable of axial translational movement relative to the input disc carrier 18. The discs of the first set of output discs 56 are engaged with the first set of output tines 50 for rotation therewith, but are capable of axial translational movement relative to the first output flange 48. The discs of the first set of output discs 56 are interleaved with the discs of the first set of input discs 54. The spring washer is located between the

discs

54, 56 and tends to separate them from one another. Thus, the first multi-plate clutch assembly E1 constitutes a first kinematic connection between the input plate carrier 34 and the first output flange 48 in a known manner.

The second clutch region 44 is provided with a second set of input teeth 58 that face radially toward the reference axis. The dual wet clutch mechanism 18 further includes a second output flange 60, the second output flange 60 including a second set of output teeth 62 and a second interface 64, the second set of output teeth 62 being located facing and at a distance from the second set of input teeth 58, the second interface 64 for rotational attachment to a second gearbox input shaft. A second multi-plate clutch assembly E2, which includes a second set of input plates 66 and a second set of output plates 68, is received in an annular volume radially defined by the second clutch region 44 of the input plate carrier 34 and the second output flange 60. The discs of the second set of input discs 66 are meshed with the second set of input teeth 58 for rotation therewith, but are capable of axial translational movement relative to the input disc carrier 34. The discs of the second set of output discs 68 are engaged with the second set of output tines 62 for rotation therewith, but are capable of axial translational movement relative to the second output flange 60. The discs of the second set of output discs 68 are interleaved with the discs of the second set of input discs 66. The spring washer is located between the

discs

66, 68 and tends to separate them from one another. Thus, the second multi-plate clutch assembly E2 constitutes a first kinematic connection between the input plate carrier 34 and the second output flange 60 in a known manner.

The transverse wall 40 includes first passage openings 70 distributed circumferentially and opening into the volume defined by the first clutch region 42 and the first output flange 48, and second passage openings 72 distributed circumferentially and opening into the volume defined by the second clutch region 44 and the second output flange 60.

The clutch control 20 includes a first annular actuator 74 (in this case a hydraulic actuator), a first rotary thrust member 76, and a first force transfer member 78, the first force transfer member 78 having an annular body 78.1 abutting the rotary thrust member 76 and a boss 78.2, the boss 78.2 passing through the first passage opening 70 in the input disc carrier 34 to allow force to be transferred from the first actuator 74 to the first set of input discs 54 and the first set of output discs 56.

The clutch control 20 also includes a second annular actuator 80 (in this case a hydraulic actuator, located radially inside the first annular actuator 74), a second rotary thrust member 82, and a second force transfer member 84, the second force transfer member 84 having an annular body 84.1 abutting the rotary thrust member 82 and lugs 84.2, the lugs 84.2 passing through the second passage openings 72 in the input disc carrier 34 to allow force to be transferred from the second actuator 80 to the second set of input discs 66 and the second set of output discs 68.

The two

actuators

74, 80 are formed in a common housing 86, which housing 86 is for attachment to a gearbox housing. The first actuator 74 is axially offset toward the input disc carrier 34 relative to a second actuator 80, the second actuator 80 being intended to be received in a recess in the gearbox housing surrounding the

input shafts

22, 24.

The inner ring of the guide roller bearing 38 for the input disc carrier 34 is shrink fitted or fixed in any way to the housing 86 of the

actuator

74, 78 or to an annular connector 87, which annular connector 87 is fixed to the housing 86 of the

actuator

74, 78.

The input disc carrier 34 also includes a ring gear 88 for connection to the motor 14 through a second kinematic connection 90, which second kinematic connection 90 may include a gear, toothed belt, chain, or any other kinematic connection member as shown in fig. 1.

The ring gear 88 preferably comprises a continuous ring of material 88.2 with meshing teeth 88.1 formed or attached thereto. According to the embodiment of fig. 1, the teeth 88.1 of the ring gear 88 face radially outwards with respect to the reference axis 100 and are positioned axially on the opposite side of the transverse wall 40 to the first and second

clutch regions

42, 44 and are radially closer to the reference axis 100 than the first and second

clutch regions

42, 44 of the input disc carrier 34. Furthermore, the teeth 88.1 of the ring gear 88 are located radially outside the first actuator 74. The input disc holder 34 comprises a connecting arm 92 connecting the transverse wall 40 and the ring gear 88 and the opening between the connecting arms. The connecting arm 92 passes through

openings

94, 96 formed in the first and second

force transmitting members

78, 84. As shown in FIG. 2, after the first force transfer member 78 and the second force transfer member 84 have been positioned, the connecting arm 92 is welded to the transverse wall 40 using a clear weld through the transverse wall 40. The connecting arm 92 is also welded to the continuous material ring 88.2 of the ring gear 88.

The hybrid powertrain 10 thus described allows the

input shafts

22, 24 of the gearbox to be driven indiscriminately from the first motor 12 (by closing the coupling clutch 32) or from the second motor 14 (by opening the coupling clutch 32). It also allows the reversible electric machine constituting the second electric motor 14 to be used as a power source in a regenerative braking mode (the coupling clutch 32 is open and one stage of the double wet clutch 18 is closed) or in a charging mode (the coupling clutch 32 is closed and the first electric motor 12 drives the reversible electric machine 14 via the input disc carrier 34, the double wet clutch 18 being able to be opened or closed).

Fig. 3 to 5 show an embodiment of the input disc carrier 34 which differs from the embodiment of fig. 1 mainly in the positioning of the ring gear 88. Thus, the ring gear 88 is positioned radially outside the first clutch region 42 of the input disc carrier 34 and axially overlaps the two

clutch regions

42, 44 of the input disc carrier 34 in fig. 3. The ring gear 88 may be secured to the input disc carrier 34 by any means, particularly by welding or shrink fitting. This embodiment would be particularly suitable in situations where axial compactness of the assembly is more desirable than radial compactness. According to the embodiment of fig. 4, the ring gear 88 is located at an axial distance from the transverse wall 40 on the side of the transverse wall 40 opposite the first and second

clutch zones

42, 44 and radially outside the

first passage openings

70, 72. In addition, the teeth 88.1 of the ring gear 88 are oriented radially inward with respect to the reference axis 100. In this case, the kinematic connection 90 to the motor can be realized by means of a transmission shaft. According to the embodiment of fig. 5, a connecting arm 92 connecting the ring gear 88 to the transverse wall 40 is located radially between the first passage opening 70 and the second passage opening 72. More specifically, the input disc carrier 34 is formed by an assembly of two annular portions 34.1, 34.2 (one external and the other internal) made of pressed metal sheet and welded together. The connecting arm 92 is formed directly in the outer part 34.1, which outer part 34.1 also comprises the first clutch region 42, while the second clutch region 44 is formed on the inner part 34.2. After the force transfer member 78 is positioned between the arms 92, the ring gear is attached to the outer portion of the arms 92.

The guide bearing surface 36 may form a raceway for a guide bearing 38.

Naturally, the examples depicted in the drawings and discussed above are given by way of non-limiting illustration only. It is expressly contemplated that the various embodiments shown may be combined with one another to form further embodiments.

It may be particularly desirable for the ring gear (shown in the figures as having straight cut spur gear teeth) to have helical gear teeth to reduce noise levels. A ring gear with bevel gear teeth is also contemplated in order to provide a connection with a motor, the rotation axis of which lies in a plane perpendicular to the reference axis.

The connecting arm 92 may be crimped or otherwise attached to the input disc holder 34 by any means. They may be secured to the ring gear 88 by any means.

It is emphasized that all of these features, even if they are only described in specific terms in relation to other specified features, either individually or in any combination, as would be apparent to a person skilled in the art based on this description, the drawings and the appended claims, may be combined with other features or groups of features disclosed herein, provided that such a combination is not explicitly excluded or in a technical environment that makes such a combination impossible or meaningless.

Claims

1. A one-piece input disc carrier (34) for a dual wet clutch mechanism (18), comprising a guiding cylindrical bearing surface (36) for a bearing (38) for guiding the input disc carrier (34) in rotation around a reference axis (100) of the input disc carrier (34), a first clutch region (42) comprising a first set of axially guiding input teeth (46) facing radially towards the reference axis (100) and located at a first radial distance from the reference axis (100), a second clutch region (44) comprising a second set of axially guiding input teeth (58) facing radially towards the reference axis (100) and located at a second radial distance from the reference axis (100) shorter than the first distance, characterized in that the input disc carrier (34) further comprises a ring gear (88) comprising meshing teeth (88.1) distributed circumferentially, the ring gear is located radially outward and radially outward of the first clutch region (42).

2. The input disc carrier according to claim 1, characterised in that the meshing teeth (88.1) of the ring gear (88) are radially outward with respect to the reference axis (100).

3. An input disc carrier according to any one of claims 1 and 2, in which the ring gear (88) comprises a continuous ring of material with a set of teeth (88.1) mounted thereon, the ring gear having helical gear teeth.

4. An input disc carrier according to any one of claims 1 to 3, characterised in that it is a one-piece component obtained by welding several pressed metal plates together and comprises a transverse wall (40) extending radially from a guide bearing surface (36) to an outer skirt forming a first clutch zone (42), and an inner skirt forming a second clutch zone (44) located radially inside the first clutch zone (42).

5. A dual wet clutch mechanism (18), comprising:

the input disc holder (34) according to any one of the preceding claims,

an input flange (26) that rotates with the input disc holder (34),

a first output flange (48) comprising a first set of axially directed output teeth (50) and a first interface (52), the first set of axially directed output teeth (50) being located facing and at a distance from the first set of input teeth (46), the first interface (52) for rotational attachment to a gearbox first input shaft (22),

a second output flange (60) comprising a second set of axially directed output teeth (62) and a second interface (64), the second set of axially directed output teeth (62) being located facing and at a distance from the second set of input teeth (58), the second interface (64) for rotational attachment to a gearbox second input shaft (24),

a first multi-plate clutch assembly (E1) located between the first set of input teeth (46) and the first set of output teeth (50),

a second multi-plate clutch assembly (E2) located between the second set of input teeth (58) and the second set of output teeth (60).

6. A dual wet clutch system (16), comprising: the dual wet clutch mechanism (18) of claim 5, and a clutch control (20) including a first annular actuator (74), a second annular actuator (80) located radially inward of the first annular actuator (74), a first force transfer member (78) transferring force from the first actuator (74) to a first multi-plate clutch assembly (E1) through one or more first passage openings (70) in the input plate carrier (34), and a second force transfer member (84) transferring force from the second actuator (80) to a second multi-plate clutch assembly (E2) through one or more second passage openings (72) in the input plate carrier (34).

7. The dual wet clutch system as claimed in claim 6, wherein the ring gear (88) is located radially outward of the first annular actuator (74).

8. Double wet clutch system according to one of the claims 6 and 7, characterized in that the first actuator (74) is axially offset with respect to the second actuator (80) towards the input disc carrier (34).

9. The dual wet clutch system as claimed in any one of claims 6 to 8, further comprising a guide bearing (38) shrink-fitted or fixed to the guide bearing surface (36) by any means and providing the clutch mechanism (18) with rotational guidance relative to a body (86) common to the first and second annular actuators (74, 80).

10. A hybrid powertrain comprising an electric motor (14), characterized in that it further comprises a dual wet clutch mechanism (18) according to claim 5 or a dual wet clutch system (16) according to any one of claims 6 to 9 and a kinematic connection (90) between the electric motor (14) and a ring gear (88).

11. Hybrid powertrain according to the preceding claim, characterized in that it further comprises a first kinematic connection (28) for connecting the first electric motor (12) to the input flange (26) of said double wet clutch mechanism (18), the first kinematic connection (28) comprising means (30) for filtering torque fluctuations, such as a double mass flywheel and a coupling clutch (32).