CN112253727A

CN112253727A - Torque transmission device

Info

Publication number: CN112253727A
Application number: CN202011184997.2A
Authority: CN
Inventors: 杨华清; 胡传胜
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-01-22

Abstract

The invention relates to a torque transmission device for a vehicle, comprising a clutch and a dual mass flywheel, wherein the clutch serves for the selective transmission of torque and comprises a counterplate (5, 5 '), and the dual mass flywheel comprises a primary mass, a secondary mass and an energy storage element (3), wherein the primary mass and the secondary mass can be rotated relative to one another against the action of the energy storage element (3), wherein the secondary mass is composed of a secondary mass cover (2) and a counterplate (5, 5 '), wherein a primary mass flange (1) forming the primary mass is arranged axially between the secondary mass cover (2) and the counterplate (5, 5 ').

Description

Torque transmission device

Technical Field

The invention relates to the technical field of vehicles. The invention relates specifically to a torque transmitting device.

Background

Dual mass flywheels are typically used between an internal combustion engine and a clutch of a vehicle to eliminate vibrations in the drive train of the vehicle. The mass flywheel has a primary mass for introducing a torque and a secondary mass for discharging the torque, wherein the primary mass and the secondary mass are rotatable relative to one another against the force of the energy store.

For example, patent documents CN 105179595B and CN 104204603B both disclose a dual mass flywheel. In the above-described aspect, the dual mass flywheel and the clutch are each independently constructed. The secondary mass of the dual mass flywheel is designed as a one-piece hub flange which bears against the energy store in the circumferential direction and has a hub part for connecting the clutch.

However, in the assembly process, the dual mass flywheel is mounted on the crankshaft of the engine, and the clutch is mounted on the input shaft of the transmission, so that the assembly process is more, and the required assembly space is larger.

Disclosure of Invention

It is therefore an object of the present invention to provide a torque transmission device including a dual mass flywheel and a clutch, which requires fewer assembly steps and requires less assembly space.

The above object may be achieved by a torque transmitting apparatus for a vehicle. The torque transmission device comprises a clutch for selectively transmitting torque and comprising a counterpressure plate, and a dual-mass flywheel comprising a primary mass, a secondary mass and an energy storage element, wherein the primary mass and the secondary mass are rotatable relative to one another against the action of the energy storage element, wherein the secondary mass is composed of a secondary mass cover and a counterpressure plate, wherein a primary mass flange forming the primary mass is arranged axially between the secondary mass cover and the counterpressure plate.

The torque transmitting devices provided herein may be disposed between an engine and a transmission of a vehicle to dampingly and selectively transmit torque.

The primary mass of the dual-mass flywheel can be connected directly or indirectly in a rotationally fixed manner to a crankshaft of an engine of the vehicle, so that power from the engine can be transmitted via the primary mass to the torque transmission device. The secondary mass of the dual-mass flywheel forms a receiving space which encloses the primary mass and the energy storage element. The secondary mass is composed of two component assemblies connected to one another, namely an engine-side secondary mass cover and a transmission-side secondary mass plate.

The clutch can be a friction clutch. Preferably, the clutch is a dry friction clutch. Preferably, the clutch is a single-disc clutch. The clutch comprises a counter plate, a pressure plate, a friction disc and an actuating assembly, wherein the pressure plate can move axially under the action of the actuating assembly to press the friction disc between the counter plate and the pressure plate, so that the transmission of torque is realized. On the power transmission path from the engine to the transmission, the back pressure plate of the clutch forms the input end of the clutch, and the friction plate of the clutch forms the output end of the clutch. Preferably, the counter-pressure plate can be mounted in a relatively rotatable manner on the radially inner shaft part of the torque transmission device. Preferably, the friction disk can be mounted in a rotationally fixed manner on a radially inner shaft part of the torque transmission device, in particular on an input shaft of a transmission of a vehicle.

By means of the annular plate element having a dual function, i.e. serving as a transmission-side secondary mass plate of the secondary mass and as a counter plate for the clutch, the dual-mass flywheel and the clutch can be integrated in a very compact manner. Thereby reducing the number of parts and the cost of the torque transmitting device. At the same time, the weight of the torque transmission device is reduced, and the dimensions, particularly in the axial direction, can also be reduced.

The dual mass flywheel and the clutch can be mounted as a whole on the shaft on the transmission side. Therefore, the axial installation space requirement of the torque transmission device can be reduced, the assembly processes can be reduced, and the assembly cost can be reduced. Furthermore, since the torque transmission device is mounted on the transmission side, the forces acting during the operation, in particular engagement, of the clutch are correspondingly exerted on the transmission side, i.e. not on the engine crankshaft, so that the requirements on the components of the engine crankshaft are reduced.

Preferably, the counter-pressure plate is a stamping.

Preferably, the secondary mass cover and the counter-pressure plate are connected to each other by welding. A secure connection between the component parts of the secondary mass is thereby achieved. At the same time, the receiving space formed by the secondary mass can be sealed off from the friction disks of the clutch, so that the lubricating medium in the dual-mass flywheel cannot penetrate into the friction clutch, which is in particular dry.

Alternatively, the secondary mass cover and the counter-pressure plate are connected to each other by riveting, and a sealing ring is provided between the secondary mass cover and the counter-pressure plate. A secure connection between the component parts of the secondary mass is thereby achieved. At the same time, the receiving space formed by the secondary mass can be sealed off from the friction disks of the clutch, so that the lubricating medium in the dual-mass flywheel cannot penetrate into the friction clutch, which is in particular dry.

In an advantageous embodiment, the clutch comprises a friction disk, wherein the friction disk can be connected in a rotationally fixed manner to the shaft element, and the torque transmission device further comprises a bearing, wherein the counter plate can be mounted on the shaft element in a relatively rotatable manner by means of the bearing. Preferably, the shaft member is a transmission input shaft. Preferably, the bearing is configured as a rolling bearing. The torque transmission device is mounted in its entirety on a shaft element, preferably the transmission input shaft.

In a further advantageous embodiment, the clutch comprises a friction disk, wherein the friction disk can be connected in a rotationally fixed manner to a shaft part designed as a hollow shaft, and the torque transmission device further comprises a bearing, wherein the counter plate can be mounted on the further shaft part in a relatively rotatable manner by means of the bearing, wherein the further shaft part extends radially inside the hollow shaft part. Preferably, the hollow shaft element is a transmission input shaft. Alternatively, the further shaft part is, for example, a motor shaft or a shaft part for connecting a rotor of a motor. Optionally, the further shaft member is a further transmission input shaft. Preferably, the bearing is configured as a rolling bearing.

In this case, a connecting disk hub is preferably integrally formed or connected to the counter-pressure plate, which connecting disk hub can be connected in a rotationally fixed manner to a further shaft part. The torque transmission device thus provides two outputs for the torque damped by the dual mass flywheel, namely the friction disks of the clutch and the secondary mass of the dual mass flywheel or the counter plate of the clutch. Thereby, the application range of the torque transmission device can be expanded. For example, in the case of a further shaft part designed as a motor shaft, since the secondary mass or counterplate is connected to the motor shaft, the motor can be connected to the engine, so that in a hybrid vehicle the excess kinetic energy generated by the engine can be converted into electrical energy by means of the motor for driving the vehicle with electrical energy or for storing electrical energy, or the engine can also be started by means of the motor. For another example, multiple shifting strategies for a vehicle may be implemented by connecting friction discs and counter plates, respectively, to different input shafts of the transmission. In addition, the arrangement of the two shaft parts in a concentric manner, i.e. the shaft parts connecting the friction disks are designed as hollow shafts, in which the shaft parts supporting the counter pressure plate extend in a relatively rotatable manner, so that the torque transmission device can be implemented in a compact manner.

In this case, the connecting disk hub can advantageously be designed as a separate part. In particular, the connecting disk hub has a flange section for a fixed connection to the counter-pressure plate and a sleeve section designed with internal splines for a rotationally fixed connection to a further shaft. The design of the counter plate can thereby be simplified.

In this case, the bearing advantageously has an axial positioning for axially delimiting the counter plate. Preferably, a radial projection is formed on the outer ring of the bearing, which projection axially stops the counter plate.

In this case, the torque transmission device advantageously also comprises a collar, wherein the bearings are positioned axially at the respective shaft part by means of the collar. In this case, a corresponding groove can be provided at the respective shaft part for the purpose of axially positioning the bearing, in particular the inner ring of the bearing, in cooperation with the collar.

In an advantageous embodiment, the torque transmission device further comprises a transmission ring gear, wherein the transmission ring gear is connected in a rotationally fixed manner to the primary mass flange and has a connection for connection to an engine crankshaft of the vehicle. The gear ring can be fixed, for example by means of bolts or rivets, to the engine crankshaft. Accordingly, the connection of the drive ring is, for example, a bolt hole or a rivet through hole. The transmission ring has an anti-rotation connection at the outer periphery, for example an externally splined section. Accordingly, the primary mass flange has a mating anti-rotation connection at the inner periphery, for example an internally splined section. Thus, the torque transmission device integrally attached to the transmission input shaft can transmit torque to the engine crankshaft via the power transmission ring gear. The assembly space required for this is also small.

Drawings

Preferred embodiments of the present invention are schematically illustrated in the following with reference to the accompanying drawings. The attached drawings are as follows:

figure 1 is a perspective view of a torque transmitting device according to one embodiment,

figure 2 is a half sectional view of the torque transmitting device according to figure 1,

FIG. 3 is a partial cross-sectional view of a torque transmitting device according to another embodiment, an

Fig. 4 is a perspective view of a land hub of the torque transfer device according to fig. 3.

Detailed Description

FIG. 1 is a perspective view of a torque transmitting device according to one embodiment. The torque transmitting device is capable of being disposed between an engine and a transmission of a vehicle to dampingly and selectively transmit torque. As shown in fig. 1, the torque transmitting devices may be integrally mounted at the transmission input shaft 8.

Fig. 2 shows a half-sectional view of the torque transmission device according to fig. 1. The torque transmitting device includes an integrally constructed dual mass flywheel and friction clutch. The dual mass flywheel and the friction clutch are concentrically arranged. The axis of rotation of the torque transfer device is indicated by X in fig. 2. The axis of rotation X is the axis of rotation of the dual mass flywheel 1 and at the same time the axis of rotation of the friction clutch and also the axis of rotation of the crankshaft of the internal combustion engine. In the following, "axial" is understood to mean a direction parallel to or coinciding with the axis of rotation X, "radial" is understood to mean a direction perpendicular to the common axis of rotation, and "circumferential" is understood to mean a direction perpendicular to the direction encircling the common axis of rotation.

In the present embodiment, the friction clutch is a single-disc dry clutch. The friction clutch comprises a counter-pressure plate 5, a friction disc 6 and a pressure plate 7 arranged in axial sequence. The pressure plate 7 is axially displaceable under the action of the actuating assembly so that the friction disc 6 is pressed between the counter-pressure plate 5 and the pressure plate 6, whereby a torque transmission is achieved.

In the present embodiment, a dual mass flywheel comprises a primary mass, a secondary mass and an energy storage element 3. The primary and secondary masses are able to rotate relative to each other against the action of the energy storage element 3 to reduce rotational non-uniformities in the torque. The primary mass is formed by an integral primary mass flange 1. The secondary mass is composed of a secondary mass cover 2 and a counter-pressure plate 5. Here, the secondary mass cover 2 and the counter-pressure plate 5 are connected to one another by riveting. The secondary mass cover 2 and the counter-pressure plate 5 jointly form a receiving space for the primary mass flange 1 and the energy storage element 3. A sealing ring 4 is arranged between the secondary mass cover 2 and the counter-pressure plate 5, so that the lubricating medium in the receiving space does not influence the operation of the friction clutch. In a further embodiment, the secondary mass cover 2 and the counter-pressure plate 5 can also be connected to one another by welding.

The torque transmitting devices are integrally mounted to the transmission input shaft 8. The counter plate 5 is mounted on the transmission input shaft 8 so as to be rotatable relative thereto by means of a bearing 9. The bearing 9 is preferably designed as a rolling bearing. The outer ring of the bearing 9 is configured with radial projections which axially stop the counter plate 5, and the inner ring of the bearing 9 is axially positioned by means of the collar 10 and the groove sections of the transmission input shaft 8, whereby the torque transmission device can be fixed at a specific axial position of the transmission input shaft 8. The friction discs 6 of the friction clutch are mounted in a rotationally fixed manner to the transmission input shaft 8, so that a torque transmission between the torque transmission device and the transmission is achieved.

The torque transmission between the torque transmission device and the engine is realized in the present embodiment by means of a transmission ring gear 11. The driving ring gear 11 can be fixed to the engine crankshaft, for example, by means of bolts or rivets. The gear ring 11 is provided with holes for screws or rivets. An internally splined section is formed on the inner circumference of the primary mass flange 1 of the dual mass flywheel and an externally splined section is formed on the outer circumference of the ring gear 11, so that the primary mass flange 1 and the ring gear 11 can be connected in a rotationally fixed manner, whereby a torque transmission between the engine crankshaft and the torque transmission device is also achieved.

The counter-pressure plate 5 provided here, which is preferably produced by stamping, acts as a component of the secondary mass of the dual-mass flywheel in addition to counteracting the engagement forces during the engagement of the clutch. The counter-pressure plate 5 here separately fulfills the function of two parts in the known solution, whereby the number of parts can be reduced and the costs reduced. At the same time, the dual mass flywheel and the clutch can be integrated in a very compact manner by means of the dual-function counter plate 5, thereby reducing the size of the torque transmission device in the axial direction.

In addition, since the dual mass flywheel and the clutch can be mounted to the transmission input shaft as a whole, the axial mounting space requirement of the torque transmission device can be reduced, the number of assembly processes can be reduced, and the assembly cost can be reduced. The forces acting during clutch operation, in particular engagement, are all applied to one side of the transmission, i.e. not to the engine crankshaft, so that the requirements on the components of the engine crankshaft are reduced.

FIG. 3 illustrates a portion of a cross-sectional view of a torque transmitting device according to another embodiment. This embodiment is configured similarly to the previous embodiment, and only the difference between the two will be described below.

In the present embodiment, the transmission input shaft 8' is configured as a hollow shaft. A motor shaft 15 is arranged in the transmission input shaft 8' so as to be relatively rotatable. The friction discs of the friction clutch are mounted in a rotationally fixed manner to the transmission input shaft 8' so as to enable torque transmission between the torque transmitting device and the transmission. The counter plate 5 'is rotatably supported on the motor shaft 15 by means of a bearing 9'.

Fig. 4 shows a perspective view of the coupling hub 14 of the torque transmission device according to fig. 3. Connecting disc hub 14 has interconnected flange and sleeve sections. As can be seen in fig. 3 and 4, the coupling hub 14 and the counter plate 5' are fixedly connected in the present embodiment by means of the locking pin 12 and the circlip 13. In particular, the flange section is provided with circumferentially distributed through holes and the counter plate 5' is provided with corresponding stepped holes. The shaft sections of the locking pins 12 are passed through the stepped holes of the counter plate 5 'and the through holes of the flange sections, respectively, from the transmission side one by one, and the shaft sections protruding from the land hub 14 on the engine side are axially fixed by means of the snap springs 13, thereby achieving a fixed connection of the land hub 14 and the counter plate 5'. In addition, an internal spline is formed in the sleeve section of the connecting disk hub 14, by means of which the connecting disk hub 14 is connected in a rotationally fixed manner to the motor shaft 15.

Although in this embodiment the interface hub 14 is connected to the motor shaft 15, it is contemplated that in other applications the interface hub 14 may be connected to a shaft input to other equipment, such as a second transmission input shaft or the like.

In the present embodiment, on the one hand, the dual mass flywheel and the clutch of the torque transmission device can be mounted as a whole at the shaft member on the transmission side, so the axial mounting space requirement of the torque transmission device can be reduced, the assembly process can be reduced, and the assembly cost can be reduced. The forces acting during clutch operation, in particular engagement, are all applied to one side of the transmission, i.e. not to the engine crankshaft, so that the requirements on the components of the engine crankshaft are reduced. In another aspect, the torque transfer device also provides two outputs for outputting the engine torque damped by the dual mass flywheel, whereby the engine can be selectively connected not only to the transmission but also to the electric machine, and the operating mode of the vehicle is expanded.

Although possible embodiments have been described by way of example in the above description, it should be understood that numerous embodiment variations exist, still by way of combination of all technical features and embodiments that are known and that are obvious to a person skilled in the art. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. From the foregoing description, one of ordinary skill in the art will more particularly provide a technical guide to convert at least one exemplary embodiment, wherein various changes may be made, particularly in matters of function and structure of the components described, without departing from the scope of the following claims.

List of reference numerals

1 Primary mass flange

2 secondary mass cover

3 energy storage element

4 sealing ring

5, 5' counter pressure plate

6 friction disk

7 pressing plate

8, 8' transmission input shaft

9, 9' bearing

10 clasp

11 drive gear ring

12 locking pin

13 circlip

14 connecting disc hub

X axis of rotation

Claims

1. A torque transmitting device for a vehicle, wherein the torque transmitting device comprises:

a clutch for selectively transmitting torque and comprising a counter plate (5, 5');

dual mass flywheel comprising a primary mass, a secondary mass and an energy storage element (3), wherein the primary mass and the secondary mass are rotatable relative to each other against the action of the energy storage element (3),

it is characterized in that the preparation method is characterized in that,

the secondary mass is composed of a secondary mass cover (2) and the counter pressure plate (5, 5') together,

wherein a primary mass flange (1) constituting the primary mass is arranged axially between at least a part of the secondary mass cover (2) and the counter pressure plate (5, 5').

2. The torque transmission device according to claim 1, wherein the secondary mass cover (2) and the counter plate (5, 5') are connected to each other by welding.

3. The torque transmission device according to claim 1, wherein the secondary mass cover (2) and the counter plate (5, 5 ') are connected to each other by riveting, and a seal ring (4) is provided between the secondary mass cover (2) and the counter plate (5, 5').

4. The torque transmitting device of claim 1,

the clutch comprises friction disks, wherein the friction disks are connected in a rotationally fixed manner to a shaft part (8), and

the torque transmission device further comprises a bearing (9), wherein the counter plate (5) is mounted on the shaft element (8) in a relatively rotatable manner by means of the bearing (9).

5. The torque transmitting device of claim 1,

the clutch comprises friction disks, wherein the friction disks can be connected in a rotationally fixed manner to a shaft part (8') designed as a hollow shaft, and

the torque transmission device further comprises a bearing (9 '), wherein the counter plate (5') is mounted on a further shaft part (15) by means of the bearing (9 ') in a relatively rotatable manner, wherein the further shaft part (15) extends radially inside the hollow shaft part (8').

6. The torque transmission device according to claim 5, wherein a land hub (14) is integrally formed or connected at the counter plate (5'), the land hub (14) being connectable in a rotationally fixed manner to the further shaft element (15).

7. The torque transmission device according to claim 6, wherein the land hub (14) has a flange section for a fixed connection with the counter plate (5') and a sleeve section configured with internal splines for a rotationally fixed connection with the further shaft element (15).

8. The torque transmitting device according to any one of claims 4 to 7, further comprising a collar (10), wherein the bearings are positioned axially at the respective shaft by means of the collar (10).

9. The torque transmission device according to claim 1, further comprising a transmission ring gear (11), wherein the transmission ring gear (11) is connected in a rotationally fixed manner to the primary mass flange (1) and has a connection for connection to an engine crankshaft of the vehicle.