transmission

Abstract

The invention relates to a transmission. A transmission is disclosed, comprising a transmission comprising: a flange; a side plate arranged to be rotatable relative to the flange in a predetermined range in a circumferential direction; a damper spring arranged in a spring mounting formed by the flange and the side plate; a centrifugal pendulum support torsionally connected to one of the flange and the side plate; a torque limiter outer hub comprising a radially outer surface and a radially inner surface, the torque limiter outer hub torsionally connected to said one of the flange and the side plate by the radially outer surface; a first friction element and a second friction element arranged radially inside the torque limiter outer hub and frictionally engaged with each other for transmitting torque in a range of a limit torque, the first friction element torsionally connected to the radially inner surface of the torque limiter outer hub; and an output hub, wherein the flange, the side plate, the centrifugal pendulum support, the torque limiter outer hub, the first friction element, the second friction element and the output hub are arranged coaxially with a rotation axis, the second friction element torsionally connected to the output hub.

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of power transmission. More specifically, the present invention relates to a power transmission device for a motor vehicle. BACKGROUND

[0002] In the prior art, a dual mass flywheel is usually installed between the engine crankshaft of a vehicle and the input shaft of a transmission for transmitting the torque of the engine crankshaft to the input shaft of the transmission while effectively damping the torsional vibration of the engine crankshaft, thereby reducing the influence of the torsional vibration of the engine crankshaft on the transmission. Due to the high damping requirement of an automatic transmission, a dual mass flywheel as a damper usually uses a large arc spring to damp the torsional vibration. In addition, in a hybrid vehicle, a torque limiter can also be provided to protect the powertrain from torque overload. However, a system having both a damper and a torque limiter is usually complex in structure, has a large number of components and is high in cost.

[0003] For this reason, there is a need for a power transmission device capable of reducing the number of components or cost while having both damping and torque limiting effects. SUMMARY

[0004] An object of the present invention is to provide a power transmission device having both damping and torque limiting effects while reducing the number of components. Another object of the present invention is to provide a power transmission device including a centrifugal pendulum damper and a torque limiter while simplifying the structure.

[0005] One aspect of the present invention provides a power transmission device, comprising: a flange; a side plate arranged to be rotatable in a predetermined range in a circumferential direction with respect to the flange; a damping spring arranged in a spring mounting portion formed by the flange and the side plate for damping torsional vibration; a centrifugal pendulum support torsionally connected to one of the flange and the side plate; a torque limiter outer hub including a radially outer surface and a radially inner surface, wherein the torque limiter outer hub is torsionally connected to the one of the flange and the side plate via the radially outer surface; a first friction member and a second friction member arranged radially inside the torque limiter outer hub and frictionally engaged with each other for transmitting torque in a range of a limit torque, the first friction member being torsionally connected to the radially inner surface of the torque limiter outer hub; and an output hub having an axis of rotation, wherein the flange, the side plate, the centrifugal pendulum support, the torque limiter outer hub, the first friction member, the second friction member and the output hub are arranged coaxially with the axis of rotation, the second friction member being torsionally connected to the output hub.

[0006] According to an embodiment of the present invention, the flange includes a first flange plate and a second flange plate, wherein the first flange plate and the second flange plate are arranged to be rotatable in a predetermined range in a circumferential direction with respect to each other.

[0007] According to an embodiment of the present application, the side plate comprises a first side plate and a second side plate which are torsionally connected to each other, and the first flange plate and the second flange plate are arranged axially between the first side plate and the second side plate, wherein the first side plate, the first flange plate, the second flange plate and the second side plate are arranged in sequence in the axial direction.

[0008] According to an embodiment of the present application, the centrifugal pendulum support and the outer hub of the torque limiter are torsionally connected to the second flange plate.

[0009] According to an embodiment of the present application, the centrifugal pendulum support and the outer hub of the torque limiter are integrally formed.

[0010] According to an embodiment of the present application, the transmission device further comprises a connecting member, wherein the second side plate comprises an arc-shaped through hole, and the connecting member passes through the arc-shaped through hole of the second side plate to fixedly connect the centrifugal pendulum support to the second flange plate.

[0011] According to an embodiment of the present application, the centrifugal pendulum support and the outer hub of the torque limiter are separately formed, and the centrifugal pendulum support is fixedly connected to the outer hub of the torque limiter.

[0012] According to an embodiment of the present application, the outer hub of the torque limiter comprises an integral protrusion on the radially inner surface to axially constrain the first friction member and the second friction member; and / or the transmission device further comprises a stopper which is separately formed from the outer hub of the torque limiter and is connected to the radially inner surface of the outer hub of the torque limiter to axially constrain the first friction member and the second friction member.

[0013] According to an embodiment of the present application, the relative rotation angle of the first flange plate relative to the second flange plate is equal to the sum of the relative rotation angle of the first flange plate relative to the side plate and the relative rotation angle of the side plate relative to the second flange plate.

[0014] Another aspect of the present application provides a vehicle comprising the transmission device according to an embodiment of the present application.

[0015] According to an embodiment of the present application, the transmission device has both damping and torque limiting functions, and can also realize a centrifugal pendulum damping structure through the centrifugal pendulum support. The centrifugal pendulum support and the outer hub of the torque limiter are both torsionally connected to one of the flanges and the side plate, such as the second flange plate. Compared with a structure employing a dual mass flywheel, for example, the transmission device of the present application can reduce the number of components and cost. Preferably, the centrifugal pendulum support and the outer hub of the torque limiter are integrally formed. This can simplify the machining and assembly process of the transmission device and reduce cost. The friction members for realizing the torque limiting function are arranged on the radially inner side of the outer hub of the torque limiter, thereby reducing the size of the transmission device. In the case where the transmission device comprises two flange plates, the torque can be transmitted in series between the two flange plates, thereby increasing the relative rotation angle between the input end and the output end of the damper, effectively reducing the torsional stiffness and providing better damping effect. Attached Figure Description

[0016] Figure 1 This is a side cross-sectional view of a transmission device according to certain embodiments of the present invention.

[0017] Figure 2 This is a side cross-sectional view of a transmission device according to certain embodiments of the present invention.

[0018] Figure 3 This is a side cross-sectional view of a transmission device according to certain embodiments of the present invention. Detailed Implementation

[0019] Hereinafter, embodiments of the invention are described with reference to the accompanying drawings. The following detailed description and drawings are provided to exemplify the principles of the invention, which is not limited to the described preferred embodiments; the scope of the invention is defined by the claims. The invention is now described in detail with reference to exemplary embodiments, some of which are illustrated in the accompanying drawings. The following description is made with reference to the accompanying drawings, and unless otherwise indicated, the same reference numerals in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all aspects of the invention. Rather, these embodiments are merely examples of systems and methods related to various aspects of the invention as covered in the appended claims.

[0020] This invention provides a transmission device for a motor vehicle. Exemplary embodiments of the invention are described below with reference to the accompanying drawings. It should be understood that the drawings only illustrate certain embodiments of the invention, and the scope of the invention should be determined according to the claims.

[0021] Figure 1 This is a side cross-sectional view of a transmission device according to certain embodiments of the present invention. According to certain embodiments of the present invention, such as... Figure 1 As shown, the transmission device includes a first side plate 10, a second side plate 20, a first flange 30, a second flange 40, a damping spring 50, a centrifugal pendulum support 60, a torque limiter outer hub 70, a first friction element 80, a second friction element 90, and an output hub 100.

[0022] In an exemplary embodiment, the side plate of the transmission device includes a first side plate 10 and a second side plate 20. The first side plate 10 and the second side plate 20 are connected together in a torsional manner. In other embodiments, the side plate may also have other structures, such as including only a single side plate.

[0023] In an exemplary embodiment, the flange of the transmission device includes a first flange 30 and a second flange 40. The side plate is circumferentially rotatable within a predetermined range relative to the flange. In an exemplary embodiment, the first flange 30 and the second flange 40 are axially disposed between the first side plate 10 and the second side plate 20. Figure 1As shown, the first side plate 10, the first flange 30, the second flange 40, and the second side plate 20 are arranged sequentially along the axial direction. In an exemplary embodiment, the first flange 30 can serve as the input part of a transmission device, wherein the first flange 30 is used to be torsionally connected to the crankshaft of the engine.

[0024] In an exemplary embodiment, the transmission device includes a plurality of damping springs 50 for attenuating torsional vibration between the flange and the side plate. Each damping spring 50 is mounted in a spring mounting portion formed by the first side plate 10, the second side plate 20, the first flange 30, and the second flange 40. In some embodiments, the damping springs 50 include damping springs for transmitting torque via compression between the first flange 30 and the first side plate 10 / second side plate 20, and damping springs for transmitting torque via compression between the first side plate 10 / second side plate 20 and the second flange 40.

[0025] According to certain embodiments of the present invention, a first flange 30 is configured to rotate circumferentially within a predetermined range relative to a first side plate 10 / second side plate 20, a second flange 40 is configured to rotate circumferentially within a predetermined range relative to the first side plate 10 / second side plate 20, and the first flange 30 and the second flange 40 are configured to rotate circumferentially within a predetermined range relative to each other. According to certain embodiments of the present invention, the relative rotation angle of the first flange 30 relative to the second flange 40 is equal to the sum of the relative rotation angles of the first flange 30 relative to the first side plate 10 / second side plate 20 and the relative rotation angles of the first side plate 10 / second side plate 20 relative to the second flange 40. In some embodiments, the first side plate 10, the second side plate 20, the first flange 30, and the second flange 40 have different types of spring mounting holes. Through the cooperation between different damping springs and different spring mounting holes, the first flange 30 and the second flange 40 can achieve series torque transmission. For example, when the first flange 30 receives torque from the engine crankshaft, the torque can be transmitted along the following path: first flange 30 → damping spring → first side plate 10 / second side plate 20 → damping spring → second flange 40. This increases the torsional angle, thereby reducing the torsional stiffness of the transmission and improving the vibration damping effect.

[0026] According to an embodiment of the invention, the centrifugal pendulum support 60 and the torque limiter outer hub 70 are respectively torsionally connected to the same flange and side plate. In an exemplary embodiment, the centrifugal pendulum support 60 is torsionally connected to the second flange 40. The centrifugal pendulum support 60 supports the pendulum mass 61, allowing the pendulum mass 61 to oscillate relative to the centrifugal pendulum support 60 during torque transmission of the transmission device. The oscillating motion of the pendulum mass can further reduce torque vibration of the transmission device.

[0027] In some embodiments, such asFigure 1 As shown, the centrifugal pendulum support 60 and the torque limiter outer hub 70 are integrally formed. For example, the centrifugal pendulum support 60 and the torque limiter outer hub 70 can be integrally formed by processes such as stamping. In an exemplary embodiment, the torque limiter outer hub 70 includes a radially outer surface 71 and a radially inner surface 72. The torque limiter outer hub 70 includes an external spline located on the radially outer surface 71 and an internal spline located on the radially inner surface 72. The centrifugal pendulum support 60 and the torque limiter outer hub 70 can be torsionally connected to the second flange 40 via the external spline.

[0028] The first friction member 80 and the second friction member 90 are used to limit the maximum torque that can be transmitted from the input to the output of the transmission device. According to an embodiment of the invention, the first friction member 80 and the second friction member 90 are frictionally engaged with each other to transmit torque within a limiting torque range. Within the limiting torque range, the first friction member 80 and the second friction member 90 rotate together due to frictional force between them. Beyond the limiting torque range, relative sliding occurs between the first friction member 80 and the second friction member 90. In an exemplary embodiment, the first friction member 80 and the second friction member 90 each include a plurality of friction discs, the friction discs of the first friction member 80 and the friction discs of the second friction member 90 being spaced apart and clamped together.

[0029] In an exemplary embodiment, a first friction member 80 and a second friction member 90 are disposed radially inside the torque limiter outer hub 70. The first friction member 80 is torsionally connected to the radially inner surface 72 of the torque limiter outer hub 70, for example, via an internal spline or teeth. The second friction member 90 is torsionally connected to the output hub 100. In an exemplary embodiment, the first side plate 10, the second side plate 20, the first flange 30, the second flange 40, the centrifugal pendulum support 60, the torque limiter outer hub 70, the first friction member 80, the second friction member 90, and the output hub 100 are arranged along the same axis of rotation (the axis of rotation of the output hub 100). In an exemplary embodiment, the output hub 100 can serve as the output portion of a transmission device, wherein the output hub 100 is used for torsionally connected to the input shaft of the gearbox.

[0030] According to certain embodiments of the present invention, the torque limiter outer hub 70 axially constrains the first friction member 80 and the second friction member 90 by means of a protrusion 73 integrally formed at one axial end and a stop 74 disposed at the other axial end. The protrusion 73 and the stop 74 are disposed on the radially inner surface of the torque limiter outer hub 70. In some embodiments, the protrusion 73 may be formed by bending the torque limiter outer hub 70. In some embodiments, the stop 74 is formed separately from the torque limiter outer hub 70 and is mounted on the radially inner surface (e.g., a corresponding groove) of the torque limiter outer hub 70; or the stop 74 is formed integrally with the torque limiter outer hub 70. In some embodiments, a spring 75 (e.g., a diaphragm spring) may also be disposed between the first friction member 80 / second friction member 90 and the stop 74 to keep the first friction member 80 and the second friction member 90 pressed together by the axial force applied by the spring 75. In some embodiments, a support plate 76 may be provided between the first friction member 80, the second friction member 90, and the protrusion 73 to better constrain the first friction member 80 and the second friction member 90 in the axial direction.

[0031] The centrifugal pendulum support 60 and the torque limiter outer hub 70 are described above as being integrally formed. However, the present invention is not limited thereto. According to embodiments of the present invention, the centrifugal pendulum support 60 and the torque limiter outer hub 70 can also be formed separately.

[0032] Figure 2 This is a side cross-sectional view of a transmission device according to certain embodiments of the present invention. Figure 2 As shown, the centrifugal pendulum support 60 is formed separately from the torque limiter outer hub 70, and the centrifugal pendulum support 60 can be connected to the second flange 40 via, for example, a connector 110. The second side plate 20 forms an arc-shaped through hole 21. The connector 110 passes through this arc-shaped through hole 21. Thus, when the centrifugal pendulum support 60 rotates with the second flange 40 relative to the second side plate 20, the connector 110 can move along the arc-shaped through hole 21 to avoid affecting the relative rotation.

[0033] Figure 3 This is a side cross-sectional view of a transmission device according to certain embodiments of the present invention. Figure 3 As shown, the centrifugal pendulum bracket 60 is formed separately from the torque limiter outer hub 70, and the centrifugal pendulum bracket 60 is fixedly connected to the torque limiter outer hub 70. In an exemplary embodiment, the centrifugal pendulum bracket 60 is fixedly connected to the portion of the torque limiter outer hub 70 located on the axially outer side of the side plate (e.g., the second side plate 20).

[0034] The torque limiter outer hub 70 is described above as being torsionally connected to components such as the second flange 40 and the first friction element 80 via splines. However, the invention is not limited thereto. According to certain embodiments of the invention, the torque limiter outer hub 70 and the centrifugal pendulum support 60 can also be torsionally connected to the aforementioned components in other ways, such as riveting, interference fit, welding, etc.

[0035] The foregoing description describes how the torque limiter outer hub 70 constrains the first friction member 80 and the second friction member 90 via protrusions 73 and stops 74 located at opposite axial ends. However, the invention is not limited thereto. According to certain embodiments of the invention, the transmission device can also constrain the first friction member 80 and the second friction member 90 in other ways, such as by two protrusions or two stops located at opposite axial ends of the torque limiter outer hub 70. Alternatively, two axial stops can be provided on the output hub 100, or one can be provided on the output hub 100 and the other on the torque limiter outer hub 70.

[0036] The transmission device described above includes two flanges. However, the invention is not limited thereto. According to certain embodiments of the invention, the transmission device may also include only a single flange. In this case, the centrifugal pendulum support 60 and the torque limiter outer hub 70 can be torsionally connected to the side plate or flange. For example, when the single flange serves as the input of the transmission device, the centrifugal pendulum support 60 and the torque limiter outer hub 70 can be torsionally connected to the side plate (e.g., via splines, etc.).

[0037] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the constructions and methods of the above embodiments. Rather, the invention is intended to cover various modifications and equivalent configurations. Furthermore, while various elements and method steps of the disclosed invention have been shown in various exemplary combinations and constructions, other combinations including more or fewer elements or methods also fall within the scope of the invention.

Claims

1. A transmission device, comprising: Flange; The side plate is configured to rotate circumferentially within a predetermined range relative to the flange; A damping spring (50) is used to transmit torque between the flange and the side plate; Centrifugal pendulum support (60) is torsionally connected to one of the flange and the side plate; A torque limiter outer hub (70) is disposed radially inside the flange and the side plate. The torque limiter outer hub (70) includes a radial outer surface (71) and a radial inner surface (72). The torque limiter outer hub (70) is directly and torsionalally connected to one of the flange and the side plate via the radial outer surface (71). A first friction element (80) and a second friction element (90) are disposed radially inside the torque limiter outer hub and frictionally engage with each other for transmitting torque within the limit torque range. The first friction element (80) is torsionally connected to the radially inner surface (72) of the torque limiter outer hub (70). The output hub (100) is torsionally connected to the second friction element (90).

2. The transmission device according to claim 1, wherein, The flange includes a first flange (30) and a second flange (40), wherein the first flange (30) and the second flange (40) are configured to rotate relative to each other within a predetermined range in the circumferential direction.

3. The transmission device according to claim 2, wherein, The side plate includes a first side plate (10) and a second side plate (20) that are torsionally connected to each other. The first flange (30) and the second flange (40) are axially disposed between the first side plate (10) and the second side plate (20), wherein the first side plate (10), the first flange (30), the second flange (40) and the second side plate (20) are arranged sequentially along the axial direction.

4. The transmission device according to claim 3, wherein, The centrifugal pendulum support (60) and the torque limiter outer hub (70) are torsionally connected to the second flange (40).

5. The transmission device according to any one of claims 1 to 4, wherein, The centrifugal pendulum support (60) and the torque limiter outer hub (70) are integrally formed.

6. The transmission device according to claim 3 or 4 further includes a connecting member (110), wherein, The second side plate (20) includes an arc-shaped through hole (21), through which the connector (110) passes to fix the centrifugal pendulum bracket (60) to the second flange (40).

7. The transmission device according to any one of claims 1 to 4, wherein, The centrifugal pendulum bracket (60) and the torque limiter outer hub (70) are formed separately, and the centrifugal pendulum bracket (60) is fixedly connected to the torque limiter outer hub (70).

8. The transmission device according to any one of claims 1 to 4, wherein, The torque limiter outer hub (70) includes an integral protrusion (73) located on the radial inner surface (72) to axially constrain the first friction element (80) and the second friction element (90); and / or The transmission device further includes a stop (74) formed separately from the torque limiter outer hub (70) or the output hub (100), the stop (74) being connected to the radial inner surface (72) of the torque limiter outer hub (70) or the output hub (100) to constrain the first friction member (80) and the second friction member (90) in the axial direction.

9. The transmission device according to claim 2, wherein, The relative rotation angle of the first flange (30) relative to the second flange (40) is equal to the sum of the relative rotation angle of the first flange (30) relative to the side plate and the relative rotation angle of the side plate relative to the second flange (40).

10. A vehicle comprising a transmission according to any one of claims 1 to 9.

Images