Friction device and transmission device with reset spring element

Abstract

The invention relates to a friction device (10) having a first friction unit (12) with a first friction area (14) arranged in a wet chamber (50), which first friction area is actuatable via a first actuating device (24) having a first actuating piston (30) which is axially movable via a fluid pressure in a first pressure chamber (28), a second friction unit (16) with a second friction area (18) which is actuatable via a second actuating device (26) having a second actuating piston (34) which is axially movable, a one-piece actuating housing (48) which is arranged axially between the first and second friction areas (14, 18) and which forms at least the first pressure chamber (28), which actuating housing movably accommodates the first and second actuating pistons (30, 34), and a first return spring element (56) which exerts at least one return force onto the first actuating piston (30), wherein the first return spring element (56) is arranged in the wet chamber (50) and is arranged radially overlapping the first pressure chamber (28). The invention also relates to a transmission device (100) having a friction device (10).

Description

Technical Field

[0001] This invention relates to a friction device according to the preamble of claim 1. The invention also relates to a transmission device having a friction device. Background Technology

[0002] DE 10 2016 217 597 A1 describes a friction device implemented as a dual-clutch, comprising: a first sub-clutch having a first friction region disposed in a wet chamber, the first friction region being operable via a first operating device having an axially movable first operating piston; and a second sub-clutch having a second friction region disposed in another wet chamber, the second friction region being operable via a second operating device having an axially movable second operating piston. A one-piece central connecting plate forming a first pressure chamber and a second pressure chamber is axially disposed between the first and second sub-clutches, the central connecting plate movably accommodating the first and second operating pistons. A first return spring element is used to load the first operating piston with a return force. The first return spring element is disposed in a compensation chamber separate from the wet chamber. Summary of the Invention

[0003] The object of this invention is to construct friction devices more cost-effectively and reliably. The structural space of the friction device should be reduced and the operation via the actuation device should be improved.

[0004] At least one of the stated objectives is achieved by a friction device having all the features of claim 1. This allows for a more stable, cost-effective, and space-saving construction of the friction device. The friction device can transmit increased torque. Assembling the friction device is simpler and more time-efficient. Preferably, the first return spring element can be installed more easily, and the return force can be transmitted to the first actuating piston more effectively and precisely.

[0005] Friction devices can be installed in vehicles, such as motor vehicles. Friction devices can be installed in the powertrain of a vehicle. The vehicle can be a hybrid vehicle or an electric vehicle. Friction devices can cause torque transmission, such as the transmission of driving torque between driving elements, especially internal combustion engines and / or electric motors, and driven elements, especially wheels, and / or cause torque support at connecting members fixed to the housing.

[0006] The friction device can be implemented as a clutch or a brake. The first friction unit can be implemented as a clutch or a brake. The second friction unit can be implemented as a clutch or a brake.

[0007] The first friction unit can be loaded with a pressure medium, such as pressurized oil, to move the first actuating piston. The pressure medium can be introduced into the actuating housing at the outer circumference. The pressure medium can act directly on the first actuating piston.

[0008] The second friction unit can be loaded with a particularly similar pressure medium, such as pressurized oil, to move the second actuating piston. The pressure medium can be introduced into the actuating housing at the outer circumference. The pressure medium can act directly on the second actuating piston.

[0009] The first friction unit and the second friction unit can be operated independently of each other. The first friction unit and the second friction unit can close simultaneously. The first friction region and the second friction region can be set on the same diameter.

[0010] The operating housing can be supported on the connecting member in a first axial direction. Additionally, the operating housing can be supported on the connecting member in the opposite second axial direction. The operating housing can be axially fixed to the connecting member by means of at least one fixing mechanism, such as a retaining ring. The retaining ring can be wedge-shaped. This allows for compensation of axial tolerances. The fixing mechanism can be located radially outside the first and / or second operating pistons.

[0011] The control housing can be arranged to radially overlap with the first friction area and / or the second friction area. The maximum outer diameter of the control housing can be smaller than the maximum outer diameter of the first friction unit and / or the second friction unit.

[0012] A first actuating piston is movable according to the fluid pressure in a first pressure chamber. A second actuating piston is movable according to the fluid pressure in a second pressure chamber. The first and / or second pressure chambers can form a driven cylinder. The first and / or second pressure chambers can be disposed in an actuating housing and are preferably implemented as an annular recess. The actuating housing can have at least one exhaust opening for venting the corresponding pressure chamber. The exhaust opening can be disposed on the outer circumference of the actuating housing.

[0013] The first return spring element is axially supported on the operating housing. The first return spring element is axially fixed to the operating housing via a retaining ring. The first return spring element, the first operating piston and / or the second operating piston, and the operating housing can form a subassembly that can be pre-installed into the friction device. The first return spring element is radially supported on the operating housing within the first operating piston and / or the second operating piston.

[0014] The friction device can have a second return spring element that applies a second return force to a second actuating piston. The first and second return spring elements can be located in the same wet chamber. The first and second return spring elements can be located on the same diameter. The first and second return spring elements can be mirror images of each other and / or implemented with identical structures.

[0015] In a preferred embodiment of the invention, it is advantageous that the radial extension of the first actuating piston is limited to the radial extension of the first pressure chamber. This reduces the radial structural space of the friction device.

[0016] In a preferred embodiment of the invention, the first actuating piston has a first sealing element in its radially outer section and a second sealing element in its radially inner section, respectively, for sealing the first pressure chamber. The respective sealing elements can be placed in grooves in the first actuating piston and preferably directly abut against the actuating housing. The first and second sealing elements can be radially disposed between the first actuating piston and the actuating housing, respectively. The respective sealing elements can be implemented as sealing rings, particularly O-rings.

[0017] In a preferred embodiment of the invention, it is advantageous that the second friction region is disposed in the same wet chamber as the first friction region, and the wet chamber is connected via a through opening in the operating housing. The through opening can be implemented as a central hole in the operating housing.

[0018] The through opening can be located radially inside the first actuating piston and / or the second actuating piston.

[0019] In one specific embodiment of the invention, it is advantageous that the first return spring element is axially supported on a retaining ring housed in a groove within the operating housing. The first return spring element can be implemented as a disc spring, leaf spring, and / or helical spring.

[0020] In an advantageous embodiment of the invention, the actuating housing is constructed in a mirror-symmetric manner about the axial plane. This allows for a more cost-effective construction of the friction device. The first and second actuating pistons can be constructed from the same components.

[0021] In one specific embodiment of the invention, it is advantageous that a first actuating piston is movable in a first axial direction to manipulate a first friction region, and a second actuating piston is movable in the opposite second axial direction to manipulate a second friction region. The movement of the first actuating piston toward the first friction region loads the first friction region and thereby closes the first friction unit. The movement of the second actuating piston toward the second friction region loads the second friction region and thereby closes the second friction unit.

[0022] In an advantageous embodiment of the invention, the operating housing is torsionally connected to the connecting member. The operating housing can be connected to the connecting member in a form-fitting, force-fitting, and / or material-fitting manner. The connecting member is preferably located radially outside the operating housing.

[0023] In an advantageous embodiment of the invention, the control housing has external teeth for torsionally connecting with a connecting member. This simplifies the installation of the control housing. The external teeth can be roll-formed.

[0024] Furthermore, at least one of the objectives described above is achieved by a transmission device having a planetary transmission stage and a previously described friction device, wherein the friction device is connected to at least one rotating member associated with the planetary transmission stage. The rotating member can be a planet carrier of the planetary transmission stage.

[0025] Other advantages and advantageous designs of the invention will become apparent from the description and drawings. Attached Figure Description

[0026] The present invention will now be described in detail with reference to the accompanying drawings. The drawings show in detail:

[0027] Figure 1 A half-section of a friction device according to a specific embodiment of the present invention is shown.

[0028] Figure 2 Show Figure 1 A perspective view of the control housing of the friction device.

[0029] Figure 3 A schematic diagram of a transmission device according to a specific embodiment of the present invention is shown. Detailed Implementation

[0030] Figure 1 A half-section of a friction device 10 according to a specific embodiment of the present invention is shown. The friction device 10 is preferably implemented as a brake and has a first friction unit 12 with a first friction region 14 and a second friction unit 16 with a second friction region 18. The first friction region 14 includes a plurality of plates 20 that are axially loaded by an operating force and thereby connected to each other in a frictional engagement. Torsion between the plates 20 is possible when the operating force is removed.

[0031] The second friction region 18 also includes pieces 20 that are rubbed together with each other by a manipulating force. The pieces 20 of the first friction region 14 include a plurality of friction pieces 20.1 suspended in an engaging manner at the inner piece support 22 and a plurality of steel pieces 20.2 suspended at an outer piece support (not shown). The pieces 20 of the second friction region 18 include a plurality of friction pieces 20.1 suspended in an engaging manner at another inner piece support 22 and a plurality of steel pieces 20.2 suspended at an outer piece support (not shown). Preferably, the friction pieces 20.1 of the first and second friction regions 14, 18 are constructed in the same manner as the steel pieces 20.2 of the first and second friction regions 14, 18.

[0032] The actuating force for loading the first friction region 14 is generated by the first actuating device 24, and the actuating force for loading the second friction region 18 is generated by the second actuating device 26. The first actuating device 24 includes a first actuating piston 30 that is axially movable via fluid pressure in a first pressure chamber 28, and the second actuating device 26 includes a second actuating piston 34 that is axially movable via fluid pressure in a second pressure chamber 32.

[0033] The first and second friction regions 14 and 18 are preferably disposed on the same diameter. The first and second actuating pistons 30 and 34 are disposed on the same diameter and are arranged in a mirror image of each other. The radial extension of the first actuating piston 30 is limited to the radial extension of the first pressure chamber 28. The radial extension of the second actuating piston 34 is also limited to the radial extension of the second pressure chamber 32. The first actuating piston 30 has a first sealing element 36 in its radially outer section and a second sealing element 38 in its radially inner section for sealing the first pressure chamber 28, respectively. The second actuating piston 34 also has a third sealing element 40 in its radially outer section and a fourth sealing element 42 in its radially inner section for sealing the second pressure chamber 32, respectively.

[0034] The first actuating piston 30 is movable in the first axial direction 44 to manipulate the first friction region 14, and the second actuating piston 34 is movable in the opposite second axial direction 46 to manipulate the second friction region 18.

[0035] The first and second pressure chambers 28 and 32 are formed in a one-piece operating housing 48, which movably accommodates the first and second operating pistons 30 and 34, respectively, and is axially disposed between the first and second friction regions 14 and 18. The operating housing 48 is constructed mirror-symmetrically about an axial plane 49. This allows the use of identical components, and the friction device 10 can be implemented more cost-effectively. Preferably, the operating housing 48 is arranged radially overlapping the first and second friction regions 14 and 18. The outer diameter of the operating housing 48 is particularly smaller than the maximum outer diameter of the first and second friction units 12 and 16, and particularly smaller than the outer diameter of the plates 20 of the first and / or second friction regions 14 and 18.

[0036] The first and second friction regions 14 and 18 are disposed in a common wet chamber 50. The first and second friction units 12 and 16 are thus implemented in a wet operation. The wet chamber 50 is connected via a through opening 52 in the operating housing 48. The through opening 52 is preferably a central hole in the operating housing 48. The operating housing 48 is torsionally connected to a connecting member, however not shown, disposed radially outside the operating housing 48. The connecting member is preferably fixed, which in particular means non-rotational. The connecting member can be torsionally connected to the outer plate support of the first friction unit 12 and the outer plate support of the second friction unit 16. Thus, the first and second friction units 12 and 16 can be implemented as brakes, respectively.

[0037] The operating housing 48 is axially fixed relative to the connecting member via a first retaining ring 54 and a second retaining ring 55. The second retaining ring 55 is preferably wedge-shaped to compensate for axial tolerances. Axial support for the operating force used to operate the first friction region 14 and / or the second friction region 18 is also achieved at the connecting member via the first and second retaining rings 54, 55.

[0038] The friction device 10 also includes a first return spring element 56, which applies at least one return force to the first actuating piston 30. The first return spring element 56 is preferably implemented as a disc spring, which rests directly against the first actuating piston 30 and is axially supported via a retaining ring 58 received in a groove in the actuating housing 48. A second return spring element 60 causes a return force acting on the second actuating piston 34. The second return spring element 60 is arranged as a disc spring, mirror-reversed from the first return spring element 56, and rests directly against the second actuating piston 34 on one side and against another retaining ring 58 received in a groove in the actuating housing 48 on the other.

[0039] First and second return spring elements 56 and 60 are disposed in the wet chamber 50. The first return spring element 56 is disposed radially overlapping with the first pressure chamber 28, and the second return spring element 60 is disposed radially overlapping with the second pressure chamber 32. This allows for a simpler and more compact construction of the friction device 10. The corresponding return spring elements 56 and 60 can be installed more easily. The corresponding actuating pistons 30 and 34 can also be better loaded with a return force via the corresponding return spring elements 56 and 60.

[0040] Figure 2 Show Figure 1 A perspective view of the operating housing 48 of the friction device. The operating housing 48 has external teeth 62, which enable it to be torsionally connected to a connecting member. A first fluid opening 64 for supplying a pressure medium, such as pressure oil, to a first pressure chamber and a second fluid opening 66 for supplying a pressure medium to a second pressure chamber are provided in the circumferential section between the external teeth 62.

[0041] On the circumferential side, vent holes 68 for venting the first and second pressure chambers are staggered from the first and second fluid openings 64, 66. Vent holes 68 are preferably located in the region between the external teeth 62 and enable selective venting of the first and second pressure chambers.

[0042] The first pressure chamber 28 is annularly arranged and capable of accommodating the first actuating piston. The actuating housing 48 has a groove 70 for accommodating a retaining ring, through which the first return spring element is axially supported.

[0043] Figure 3 A schematic diagram of a transmission device 100 according to a specific embodiment of the present invention is shown. The transmission device 100 has multiple planetary transmission stages 102. The friction device 10 includes a first friction unit 12 implemented as a clutch and a second friction unit 16 implemented as another clutch. The driving torque of a first drive element, such as an internal combustion engine, can be transmitted to the transmission device 100 via the transmission input shaft 104. The transmission device 100 has an electric motor 106 capable of introducing another driving torque. The transmission device 100 is connected to at least one wheel, for example, on the output side.

[0044] Friction device 10 and rotating member 108 are connected here to planetary carrier 110, which forms connecting member 112. The inner plate carrier 22 of the first friction unit 12 is torsionally connected to sun gear 114, and the inner plate carrier 22 of the second friction unit 16 is torsionally connected to transmission input shaft 104.

[0045] List of reference numerals

[0046] 10 Friction Equipment

[0047] 12 First Friction Unit

[0048] 14 First Friction Zone

[0049] 16 Second Friction Unit

[0050] 18 Second friction zone

[0051] 20 pieces

[0052] 20.1 Friction Plate

[0053] 20.2 Steel sheet

[0054] 22 Inner sheet support component

[0055] 24 First operating device

[0056] 26 Second Operating Equipment

[0057] 28 First pressure chamber

[0058] 30 First Control Piston

[0059] 32 Second pressure chamber

[0060] 34 Second Control Piston

[0061] 36 First sealing element

[0062] 38 Second sealing element

[0063] 40 Third sealing element

[0064] 42 Fourth sealing element

[0065] 44 First axial direction

[0066] 46 Second axial direction

[0067] 48 Control Housing

[0068] 49 Axial plane

[0069] 50 wet room

[0070] 52 Through opening

[0071] 54 First Ring

[0072] 55 Second clasp

[0073] 56 First return spring element

[0074] 58 clasps

[0075] 60 Second reset spring element

[0076] 62 External teeth

[0077] 64 First fluid opening

[0078] 66 Second fluid opening

[0079] 68 Exhaust holes

[0080] 70 Groove

[0081] 100 Transmission Equipment

[0082] 102 Planetary Transmission Stage

[0083] 104 Gearbox Input Shaft

[0084] 106 Electric Motor

[0085] 108 Rotating components

[0086] 110 Planetary Carrier

[0087] 112 Connecting components

[0088] 114 Sun Wheel

Claims

1. A friction device (10), having: a first friction unit (12) with a first friction area (14) arranged in a wet chamber (50), the first friction area being able to be actuated via a first actuation device (24), the first actuation device having a first actuation piston (30) which is axially movable via a fluid pressure in a first pressure chamber (28); a second friction unit (16) with a second friction area (18), the second friction area being able to be actuated via a second actuation device (26), the second actuation device having a second actuation piston (34) which is axially movable; an actuation housing (48) which is arranged axially between the first and second friction areas (14, 18) and which is formed in one piece at least of the first pressure chamber (28), the actuation housing movably accommodating the first and second actuation pistons (30, 34); and a first return spring element (56) which exerts at least one return force onto the first actuation piston (30), characterized in that the first return spring element (56) is arranged in the wet chamber (50) and is arranged radially overlapping the first pressure chamber (28), the first return spring element (56) being able to be supported on the actuation housing (48) radially inside the first actuation piston (30). The radial extension of the first actuation piston (30) is limited to the radial extension of the first pressure chamber (28). The first actuation piston (30) has a first sealing element (36) at a radially outer section and a second sealing element (38) at a radially inner section for sealing the first pressure chamber (28), respectively. The second friction area (18) is arranged in the same wet chamber (50) as the first friction area (14), and the wet chamber (50) is connected via a through-opening (52) in the actuation housing (48). The first return spring element (56) is axially supported on a snap ring (58) which is accommodated in a groove (70) in the actuation housing (48). The actuation housing (48) is mirror-symmetrically configured about an axial plane (49). The first actuation piston (30) is movable in a first axial direction (44) for actuating the first friction area (14), and the second actuation piston (34) is movable in a second, opposite axial direction (46) for actuating the second friction area (18). The actuation housing (48) is torsionally connected with a connecting member (112). The actuation housing (48) has an outer toothing (62) for torsionally connecting with the connecting member (112).

10. A transmission device (100) having a planetary transmission stage (102) and a friction device (10) according to any one of the preceding claims, wherein the friction device (10) is connected with at least one rotating member (108) associated with the planetary transmission stage (102). ​ ​ ​ ​ ​ ​ ​ 2. The friction device (10) according to claim 1, characterized in that ​ 3. The friction device (10) according to claim 1 or 2, characterized in that ​ 4. The friction device (10) according to any one of the preceding claims, characterized in that ​ 5. A friction device (10) according to any one of the preceding claims, characterized in that ​ 6. A friction device (10) according to any one of the preceding claims, characterized in that ​ 7. A friction device (10) according to any one of the preceding claims, characterized in that ​ 8. A friction device (10) according to any one of the preceding claims, characterized in that ​ 9. The friction device (10) according to claim 8, characterized in that ​ ​

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