DE102012221411A1 - Power transmission device for use in powertrain of motor car, has mold element riveted or welded with housing by bolt or weld seam, where chamber and friction elements are arranged between housing and mold element to press elements together - Google Patents

Abstract

The device (100) has a hydrodynamic hydraulic clutch (110) provided with an impeller (116) and a turbine wheel (120). A shiftable friction clutch (112) is provided with two friction elements (124, 126). A hydraulic pressure chamber (136) is provided with an axial displaceable piston (134) for exertion of axial force on one of the elements. The chamber and the elements are arranged between a housing (104) and a mold element (166) to press the elements together in a pressure controlled manner. The mold element is riveted or welded with the housing by a bolt (162) or a weld seam.

Description

The invention relates to a power transmission device having the features of claim 1. In particular, the invention relates to a power transmission device for use in the drive train of a motor vehicle.

In a drive train of a motor vehicle, a drive motor is coupled to a transmission by means of a power transmission device. The power transmission device comprises a hydrodynamic converter, to which a shiftable friction clutch is connected in parallel. If the friction clutch is opened, a power transmission takes place as a function of a speed difference between the drive motor and the transmission. This operating mode of the power transmission device is useful, for example, for starting the motor vehicle. After starting, the friction clutch can be closed to minimize flow losses at the fluid coupling.

In order to minimize wear of the power transmission device and dissipate heat, a liquid, in particular an oil, with which the device is at least partially filled, be circulated via dedicated channels.

In order to close the friction clutch, a pressure chamber, which can be acted upon independently with a hydraulic pressure, is provided with a piston, wherein the piston exerts an axial force on a first friction element and presses against a second friction element. If the pressure chamber is supported on a housing of the power transmission device, the second friction element must be supported axially by a radial support wall, wherein the support wall is non-positively connected to the housing. Is supported in another embodiment, the second friction element on the housing, so the pressure chamber must be supported axially on the support wall, which in turn is non-positively connected to the housing.

The frictional connection between the support wall and the housing is usually made via a hub, whose manufacture and installation is relatively complicated and therefore expensive.

DE 19920542 shows a torque transmitting device in which separate channels for a circulation of liquid and for applying a hydraulic pressure chamber with liquid to close the friction clutch, are provided. Similar transmission facilities are off DE 19920542 . DE 10 2007 055 145 . WO 2009049741 . US-2009-0032351 and US-2011-0120829 known.

The present invention has for its object to provide a power transmission device with a less complex connection between the support wall and the housing.

The object is achieved by a power transmission device with the features of claim 1. Subclaims give preferred embodiments again.

A power transmission device according to the invention comprises a housing for introducing the force and a shaft for dissipating the force, wherein the housing and the shaft are rotatably arranged about a common axis of rotation, a hydrodynamic fluid coupling and a switchable friction clutch. The hydrodynamic fluid coupling comprises an impeller and a turbine wheel, the impeller being connected to the housing and the turbine wheel being torque-coupled to the shaft, and the shiftable friction clutch comprises a first friction member connected to the housing and a second friction member torque-coupled to the shaft. The power transmission device further comprises a hydraulic pressure chamber with an axially displaceable piston for exerting an axial force on the first friction element and a mold element which extends in the radial direction, wherein the pressure chamber and the friction elements are arranged axially between the housing and the mold element to the Pressure-axially compressed friction elements together. The molded element is riveted or welded to the housing.

By attaching the element on the housing by means of riveting or welding a complex clutch hub, which would otherwise be required for connection, can be saved. Manufacturing costs for the power transmission device can be reduced.

In one embodiment, the mold element is adapted to abut the piston in the lateral direction. In other words, the mold element carries the piston and supports it laterally with respect to its direction of movement, so that the piston sweeps along the mold element as it moves. The power transmission device can thereby be made compact and simple, and a sealing of the piston with respect to the mold element can be implemented simply and inexpensively.

In a further embodiment, the form element is non-rotatably attached to the housing. A relative rotation between the piston and the mold element can be prevented.

In a preferred embodiment, the power transmission device further comprises comprising a support wall, wherein the mold element comprises an axial portion for limiting the pressure space and a radial portion for attachment to the support wall, and the radial portion between the support wall and the housing extends.

The mold element can essentially replace the otherwise conventional clutch hub and can be produced as a cost-effective sheet metal part.

The mold element and / or the support wall may comprise a radial recess for promoting a circulation of a liquid in the housing. As a result, the power transmission device is particularly suitable for a liquid circulation for cooling the elements of the power transmission device independently of a hydraulic actuation of the piston.

The support wall may include radially within the attachment to the housing an axial portion for engagement with another element of the power transmission device. In this area, in particular, a sealing surface may be arranged, which seals radially inwardly or axially with respect to an adjacent element. Thereby, the support wall can be inserted in an improved manner in the structure of the remaining elements of the power transmission device and also a centering of the support wall can be carried out in a simple manner.

The mold element can be welded to the housing, for example by means of one or more punctiform or a peripheral welded joint. In this case, said support wall can be welded so that it is firmly connected to the housing and the mold element.

Instead of welding a fastening by means of a bolt can be selected. The bolt is preferably attached to the housing and extends in the axial direction. The molded part and optionally the support wall are pushed onto the bolt and the bolt is deformed, in particular by rolling, caulking or riveting. As a result, a simple and inexpensive installation of the molding on the housing is possible. This assembly can also be easily carried out if already further elements of the power transmission device are arranged in the housing.

In various embodiments, the bolt may be formed directly on the housing, welded to the housing or riveted to the housing. Depending on the available space conditions, each of the mentioned connection techniques can improve manufacturability and in particular assembly capability of the power transmission device.

If the bolt is riveted to the building, then the bolt can be designed as a step rivet for maintaining a predetermined distance between the support wall and the housing. As a result, simultaneous assembly of the step rivets on the housing and the molded part on the step rivet can be made possible in a single operation.

In yet another embodiment, the cover comprises an axial projection extending axially in the direction of the molding, and the connection with the molding occurs in the region of the projection. In the case of the connection by means of a bolt, the bolt can be made shorter in this way, whereby the load can drop by leverage forces on the bolt.

In a particularly preferred embodiment, the power transmission device further comprises an elastic vibration damper for torque-locking coupling of the second friction element and the turbine wheel to the shaft. The vibration damper may in particular comprise one or more compression or bow springs. As a result, in particular torsional vibrations between the introduced and the discharged force can be reduced or canceled out.

The invention will now be described in detail with reference to the accompanying drawings, in which:

1 a power transmission device;

2 a section of the power transmission of 1 in a further embodiment;

3 a detail from the power transmission of the 1 or 2 with an attachment in an alternative embodiment; and

4 a variant of the attachment 3 shows.

1 shows a power transmission device 100 for use in a drive train, in particular of a motor vehicle.

A drive plate 102 is torque-locking with a housing 104 connected and serves as an input side of the power transmission device 100 , The input side is particularly adapted for connection to a drive motor. An output side of the power transmission device 100 is through a wave 106 educated. The wave 106 is especially adapted for connection to a transmission. The housing 104 and the wave 106 are about a common axis of rotation 108 rotatably arranged. In another embodiment, the input or dissipation of force also done by means of other components.

The illustrated power transmission device 100 includes a fluid coupling 110 , a friction clutch 112 and a torsional vibration damper 114 , The fluid coupling 110 and the friction clutch 112 are connected in parallel with each other and for power transmission between the housing 104 and the torsional vibration damper 114 arranged. The optional torsional vibration damper 114 transfers the force introduced into it to the shaft 106 ,

The fluid coupling 110 is a hydrodynamic torque converter that is an impeller 116 , a stator 118 and a turbine wheel 120 includes. The impeller 116 is fixed to the case 104 connected or on the housing 104 educated. Between the impeller 116 and the turbine wheel 120 acts a force-transmitting fluid 122 , The more force is transmitted, the higher a speed difference between the impeller 116 and the turbine wheel 120 is.

The friction clutch 112 includes first friction elements 124 and second friction elements 126 , which are arranged alternately in the axial direction, to the in the power transmission device 100 initiated force in response to an axial compression force on the friction elements 124 . 126 transferred to. The first friction elements 124 are on a shoulder plate 128 axially displaceable, but torque-tight about the axis of rotation 108 attached, with the shoulder plate 128 firmly with a flange 130 connected is. The flange 130 has a dual function, which will be discussed in more detail below, as a device for the radial transmission of force and as a support wall for an axial force. The flange 130 can therefore, in particular in connection with the axial compression of the friction elements 124 . 126 , also referred to as a support wall.

The flange 130 is torque-locking with the housing 104 coupled. The second friction elements 126 are torque-fit around the axis of rotation 108 , but axially displaceable on another shoulder plate 132 attached to the torsional vibration damper 114 riveted.

The axial compression force on the friction elements 124 . 126 is between the flange on the right 130 and a piston on the left 134 exercised. The piston 134 limits one on the housing 104 trained pressure room 136 and is mounted axially displaceable. The compression force on the friction elements 124 . 126 is dependent on a hydraulic pressure in the pressure chamber 136 , To control the hydraulic pressure is the pressure chamber 136 by means of a channel 138 connected to a reservoir of fluid. Preferably, the fluid is the same as the fluid 122 the fluid coupling 110 ,

The optional torsional vibration damper 114 includes a first flange 140 and a second flange 142 , between which on a circumference around the axis of rotation 108 one or more elastic elements 144 are arranged. The first flange 140 is rotatable on a hub 148 centered, with the hub 148 by means of a toothing in engagement with the shaft 106 stands. The second flange 142 is torque-locking with the hub 148 riveted, with the rivets used also the turbine wheel 120 the fluid coupling 110 at the hub 148 Fasten.

For cooling and lubricating the elements in the housing 104 it is intended the fluid 122 in the case 104 to circulate or exchange. A feeder channel 150 for fluid 122 is between a coupling element 152 and an axial extension 154 of the housing 104 educated. Through the feed channel 150 can be fluid 122 axially to the left and then in the area of the stator 118 up into the space between the impeller 116 and the turbine wheel 120 flow. From there, the fluid can 122 along an inner surface of the housing 104 or the impeller 116 continue to flow to the left and there the elements of the torsional vibration damper 114 umspülen. Subsequently, the fluid 122 flow radially inward and in the area of a thrust bearing 156 in an axial channel 158 enter, which is in a discharge channel 160 opens, between the coupling element 152 and the wave 106 is formed. Through the discharge channel 160 can the fluid 122 be transported axially to the right.

In a power transmission device 100 The illustrated type with separate channels for the supply and removal of fluid 122 and actuating the piston 134 So far, it has been necessary to the left of the hub 148 to provide another hub to the flange 130 during assembly frictionally with the housing 104 connect to. In the illustrated embodiment, the attachment takes place by means of a bolt 162 which extends in the axial direction. The bolt 162 can on the case 104 be trained or connected with him. In one embodiment, the bolt 162 with the housing 104 welded, in another embodiment with the housing 104 riveted. During assembly, the flange becomes 130 from the right axially on the bolt 162 deferred and the bolt 162 then axially deformed to the flange 130 at the bolt 162 to secure. The deformation is preferably carried out by riveting, but can also be done for example by caulking, rolling or by another type of deformation.

Preferably, the flange 130 radially inside the bolt 162 bent in the axial direction to the hub 148 to be centered. In the illustrated embodiment is between the axial portion of the flange 130 and the hub 148 a seal 164 arranged, which makes a twist between the flange 130 and the hub 148 tolerated.

In the illustrated embodiment, a molding element 166 provided that the flange 130 enclosed and together with the flange 130 by means of the bolt 162 on the housing 104 is attached. The form element 166 forms another boundary of the pressure chamber 136 , In the illustrated, preferred embodiment, the mold element extends 166 also radially inside the bolt 162 even further inward and carries the thrust bearing 156 , so that this axially between the mold element 166 and the flange 148 lies.

In one embodiment, the molding element is in the form of 166 and / or in the flange 130 a radial recess 168 introduced to a transport of the fluid 122 in the radial direction to the axial channel 158 to enable. In a further embodiment, the flange 130 or the form element 166 also be broken for the same purpose.

2 shows a section of the power transmission device 100 out 1 in a further embodiment. While in the in 1 shown embodiment of the pressure chamber 136 with the piston 134 between the case 104 and the friction elements 124 . 126 is arranged, the pressure chamber is located 136 in the in 2 illustrated embodiment between the friction elements 124 . 126 and the flange 130 , With increasing pressure in the pressure chamber 136 becomes the piston 134 pressed to the left instead of the right to the friction elements 124 . 126 axially to press together.

The shoulder plate 128 , in which the first friction elements 124 engage, is on the housing 104 attached. For attachment, for example, another bolt 205 according to the bolt 162 be used. The shoulder plate 128 can also be on the case 104 welded or otherwise connected to this. The shoulder plate 132 into which the second friction elements 126 engage, is at the first flange 140 connected by torque, for example by riveting. The pressure room 136 lies axially between the first flange 140 and the friction elements 124 . 126 , To the right is the pressure room 136 through the flange 130 and left through the piston 134 limited. The form element 166 forms a radially inner boundary of the pressure chamber 136 and is together with the flange 130 by means of the bolt 162 with reference to the above 1 executed way on the housing 104 attached.

3 shows a detail from the power transmission equipment 100 from the 1 or 2 to illustrate an attachment of the flange 130 and optionally also of the formula element 166 on the housing 104 ,

The housing 104 includes in the area of the bolt 162 an axial projection 305 in the direction of the flange 130 , The illustrated bolt 162 is on the case 104 formed, however, as described above, in other ways with the housing 104 be connected. The form element 166 includes a radial section 310 and an axial section 315 , In the axial section 315 is a circumferential groove 320 for receiving a seal 164 provided to the piston 134 opposite the mold element 166 or with respect to the through the mold element 166 delimited pressure room 136 seal.

The radial section 310 of the formula element 166 runs between the axial section 315 and the bolt 162 and radially inward and outward to the axial section 315 in the radial direction. The flange 130 points in the area of the bolt 162 an axial projection 325 in the direction of the housing 104 on. Radial inside the bolt 162 extends the flange 130 in an axial section 330 For example, for centering the flange 130 can abut radially or axially on a further element of the power transmission device. The further element can in particular be the hub 148 be like in the 1 and 2 is shown.

To ensure a predetermined axial distance between the flange 130 and the housing 104 , with or without simultaneous attachment of the formula element 166 , the bolt can 162 include a step rivet. The step rivet has a first axial section with a large diameter to axially between the housing 104 and the flange 130 to abut, and a second axial section with a smaller diameter, to pass through a corresponding recess in the flange 130 to be riveted and riveted on the other side.

Is the form element 166 not together with the flange 130 on the housing 104 fastened, a separate attachment to one of the two parts, for example by riveting or welding done.

4 shows a variant of the attachment 3 , The attachment of the flange 130 and the formula element 166 on the housing 104 done here not by means of a bolt 162 but by means of a weld 405 , which connects the three elements cohesively.

LIST OF REFERENCE NUMBERS

100

Power transmission device

102

drive plate

104

casing

106

wave

108

axis of rotation

110

fluid coupling

112

friction clutch

114

torsional vibration damper

116

impeller

118

stator

120

turbine

122

fluid

124

first friction elements

126

second friction elements

128

shoulder plate

130

Flange (retaining wall)

132

shoulder plate

134

piston

136

pressure chamber

138

channel

140

first flange

142

second flange

144

elastic element

148

hub

150

feed channel

152

coupling element

154

axial extension of the housing 104

156

thrust

158

axial channel

160

discharge channel

162

bolt

164

poetry

166

forming element

168

radial recess

205

bolt

305

head Start

310

radial section

315

axial section

320

groove

325

head Start

330

axial portion of the flange 130

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19920542 [0006, 0006]
• DE 102007055145 [0006]
• WO 2009049741 [0006]
• US 2009-0032351 [0006]
• US 2011-0120829 [0006]

Claims (10)

Power transmission device ( 100 ), comprising: - a housing ( 104 ) to initiate the force and a wave ( 106 ) for delivering the force, wherein the housing ( 104 ) and the wave ( 106 ) about a common axis of rotation ( 108 ) are rotatably arranged; A hydrodynamic fluid coupling ( 110 ) with a pump wheel ( 116 ) and a turbine wheel ( 120 ), whereby the impeller ( 116 ) with the housing ( 104 ) and the turbine wheel ( 120 ) torque-locking to the shaft ( 106 ) is coupled; - a switchable friction clutch ( 112 ) with a first friction element ( 124 ) connected to the housing ( 104 ), and a second friction element ( 126 ), the torque-locking to the shaft ( 106 ) is coupled; - a hydraulic pressure chamber ( 136 ) with an axially displaceable piston ( 134 ) for exerting an axial force on the first friction element ( 124 ); A form element ( 166 ) extending in the radial direction; - where the pressure chamber ( 136 ) and the friction elements ( 124 . 126 ) axially between the housing ( 104 ) and the form element ( 166 ) are arranged to the friction elements ( 124 . 126 ) Press-controlled axially together to press; characterized in that - the shaped element ( 166 ) with the housing ( 104 riveted ( 162 ) or welded ( 405 ). Power transmission device ( 100 ) according to claim 1, wherein the molded element ( 166 ) is adapted to the piston ( 134 ) in a lateral direction. Power transmission device ( 100 ) according to claim 1 or 2, wherein the molded element ( 166 ) rotatably on the housing ( 104 ) is attached. Power transmission device ( 100 ) according to one of the preceding claims, further comprising a retaining wall ( 130 ), wherein the shaped element ( 166 ) an axial section ( 315 ) for limiting the pressure chamber ( 136 ) and a radial section ( 310 ) for attachment to the retaining wall ( 130 ), and the radial section (FIG. 310 ) between the supporting wall ( 130 ) and the housing ( 104 ) runs. Power transmission device ( 100 ) according to one of the preceding claims, wherein the molded element ( 166 ) and / or the supporting wall ( 130 ) a radial depression ( 168 ) for promoting a circulation of a liquid ( 122 ) in the housing ( 104 ). Power transmission device ( 100 ) according to one of the preceding claims, wherein the supporting wall ( 130 ) radially inside the attachment ( 162 . 405 ) on the housing ( 104 ) an axial section ( 330 ) for attachment to another element ( 148 ) of the power transmission device ( 100 ). Power transmission device ( 100 ) according to one of the preceding claims, wherein the molded element ( 166 ) to a bolt ( 162 ) riveted on the housing ( 104 ) is attached. Power transmission device ( 100 ) according to claim 7, wherein the bolt ( 162 ) on the housing ( 104 ) is riveted and the bolt ( 162 ) a step rivet for maintaining a predetermined distance between the mold element ( 166 ) and the housing ( 104 ). Power transmission device ( 100 ) according to one of the preceding claims, wherein the lid ( 104 ) an axial projection ( 305 ) and the compound ( 162 . 405 ) with the shaped element ( 166 ) in the region of the projection ( 305 ) he follows. Power transmission device ( 100 ) according to one of the preceding claims, further comprising an elastic vibration damper ( 114 ) for the torque-locking coupling of the second friction element ( 126 ) and the turbine wheel ( 120 ) to the shaft ( 106 ).

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