Drive device

Abstract

A drive device with a drive unit which has an output shaft and is mechanically connected to a driven shaft of the drive device via a clutch. At least one hydraulic channel and one hydraulic cylinder flow-connected to the hydraulic channel are formed in the output shaft, wherein a hydraulic piston coupled to the clutch for operating the same is displaceably arranged in the hydraulic cylinder.

Claims

1. A drive device with an output shaft having a drive unit which is mechanically connected to a driven shaft of the drive device via a clutch, wherein in the output shaft, at least one hydraulic channel and one hydraulic cylinder flow-connected to the hydraulic channel are formed, wherein a hydraulic piston coupled to the clutch is displaceably arranged in the hydraulic cylinder for operating the clutch, wherein the output shaft is mounted on the driven shaft via an intermediate shaft, wherein the output shaft is coupled to the intermediate shaft and the intermediate shaft is mounted in the driven shaft by at least one bearing wherein the intermediate shaft is coupled to at least one outer plate carrier of the clutch, wherein a plate pack of the clutch has at least one outer plate non-rotatably connected to the outer plate carrier and at least one inner plate non-rotatably connected to an inner plate carrier and is arranged on a side of the outer plate carrier facing away from the output shaft, and wherein a coupling element configured to operate the plate pack engages on a first side with the hydraulic piston and on a second side with the plate pack and extends through the outer plate carrier.

2. The drive device according to claim 1, wherein the hydraulic channel in the output shaft has an orifice on its side facing away from the hydraulic cylinder, which orifice is formed in a lateral surface of the output shaft.

3. The drive device according to claim 2, wherein the intermediate shaft is coupled to at least one outer plate carrier of the clutch.

4. The drive device according to claim 2, wherein the driven shaft is coupled to at least one inner plate carrier of the clutch or at least partially forms the inner plate carrier.

5. The drive device according to claim 1, wherein the driven shaft is coupled to at least one inner plate carrier of the clutch or at least partially forms the inner plate carrier.

6. The drive device according to claim 1, wherein the outer plate carrier has a first carrier element and a second carrier element to form a vibration damper, wherein the first carrier element is rigidly connected to the intermediate shaft and the second carrier element is non-rotatably connected to the at least one outer plate, and the first carrier element and the second carrier element are connected to one another in an elastically damping manner.

7. The drive device according to claim 1, wherein a second drive unit is mechanically connected to the drive unit via the clutch.

8. The drive device according to claim 7, wherein the second drive unit is arranged next to the drive unit.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) The invention will be explained in greater detail below with reference to the exemplary embodiments depicted in the drawings, without this limiting the invention. Wherein:

(2) FIG. 1 shows a schematic view of a drive device with a drive unit and another drive unit,

(3) FIG. 2 shows a schematic longitudinal sectional view through a clutch of the drive device, and

(4) FIG. 3 shows a schematic detailed longitudinal sectional view through a region of the drive device.

DETAILED DESCRIPTION

(5) FIG. 1 shows a schematic view of a drive device 1 which has a first drive unit 2 and a second drive unit 3. The first drive unit 2 is an internal combustion engine and the second drive unit 3 is an electrical machine. The first drive unit 2 has a crankshaft which serves as an output shaft 4. At least one piston 5 of the first drive unit 2 engages in a known manner with the output shaft 4. In the exemplary embodiment shown, there are several pistons 5, particularly six pistons 5. The output shaft 4 of the first drive unit 2 is connected to a driven shaft 7 of the drive device 1 via a clutch 6. The output shaft 4 and the driven shaft 7 are arranged coaxially to one another in the exemplary embodiment shown here.

(6) A gear 8 is arranged on the driven shaft 7 in at least one gear stage 9, via which gear the second drive unit 3 is mechanically connected to the driven shaft 7, preferably rigidly and/or permanently. In the exemplary embodiment shown here, there are several gear stages 9, particularly two gear stages 9, each of which has two gear wheels 8. In the exemplary embodiment shown here, a vibration damper 10 is integrated into the clutch 6 of the drive device 1. This means that the two drive units 2 and 3 are mechanically connected to one another via the clutch 6 and the vibration damper 10 and can thus be coupled to one another.

(7) FIG. 2 shows a schematic longitudinal sectional view of the clutch 6 with the vibration damper 10 integrated therein. An intermediate shaft 11 is visible, which is provided and configured for coupling to the output shaft 4. Particularly, the intermediate shaft 11 has for this purpose a toothing 12, particularly an internal toothing, for coupling to the output shaft 4 or to a counter-toothing of the output shaft 4. It can be seen that the intermediate shaft 11 is rotatably mounted in the driven shaft 7, that is, on the driven shaft 7, by means of at least one bearing 13, in the embodiment shown here by several bearings 13. For this purpose, the bearing 13 rests on the inside against an outer peripheral surface of the intermediate shaft 11 and on the outside against an inner peripheral surface of the driven shaft 7.

(8) The intermediate shaft 11 is coupled to an outer plate carrier 14 of the clutch 6. The outer plate carrier 14 has a first carrier element 15 and a second carrier element 16. The first carrier element 15 is rigidly and permanently connected to the intermediate shaft 11; particularly, the first rotary element 15 is formed in one piece with, and of the same material as, the intermediate shaft 11. The second carrier element 16 is connected to the first carrier element 15 in an elastically damping manner in the circumferential direction with respect to an axis of rotation 17 of the driven shaft 7, that is, via at least one damping element 18. In the exemplary embodiment shown here, multiple damping elements 18 are arranged in the peripheral direction at a spacing from one another. However, the can also be just a single damping element 18.

(9) The second carrier element 16 is non-rotatably connected to at least one outer plate 19 of the clutch 6. There are preferably several outer plates 19, each of which is non-rotatably connected to the second carrier element 16. In addition to the at least one outer plate, the clutch 6 has at least one inner plate 20, which is non-rotatably connected to an inner plate carrier 21. In the exemplary embodiment shown here, the driven shaft 7 serves as the inner plate carrier 21. The at least one outer plate 19 and the at least one inner plate 20 together form a plate pack 22, which can be operated, particularly compressed, to establish an operative connection between the intermediate shaft 11 and the driven shaft 7.

(10) It can be seen that, due to the integration of the vibration damper 10 in the clutch 6, a significant installation space reduction can be achieved in the axial direction, particularly because the at least one damping element 18 and the plate pack 22 overlap at least in some regions in the axial direction. Particularly, in the exemplary embodiment shown here, the at least one damping element 18 at least partially engages around the plate pack 22 in the circumferential direction. The vibration damper 10 shown here is particularly preferably designed in the manner of a two-mass flywheel.

(11) FIG. 3 shows a schematic longitudinal sectional view of a region of the drive device 1, wherein particularly the output shaft 4 of the first drive unit 2, the clutch 6 with the integrated vibration damper 10, and the driven shaft 7 are depicted. It can be seen that the output shaft 4 is fastened to the intermediate shaft 11 by means of a fastening element 23. In addition to the toothing 12, which creates a positive connection between the output shaft 4 and the driven shaft 7, there is a non-positive connection between the output shaft 4 and the driven shaft 7 which is implemented using the fastening element 23.

(12) The clutch 6 is actuated using an actuator 24 which has a hydraulic cylinder 25 formed in the output shaft 4 and a hydraulic piston 26 arranged in the hydraulic cylinder 25. The hydraulic cylinder 25 and the hydraulic piston 26 jointly delimit a hydraulic chamber 27 into which a hydraulic channel 28 opens, which channel is also formed in the output shaft 4. In the exemplary embodiment shown here, the hydraulic channel 28 has a first channel region 29 and a second channel region 30, wherein the first channel region 29 opens directly into the hydraulic chamber 27, whereas the second channel region 30 is only indirectly flow-connected to the hydraulic chamber 27 via the first channel region 29.

(13) The first channel region 29 preferably is continuously straight. Particularly, it runs parallel to the axis of rotation 17. The second channel region 30 preferably is also continuously straight, but can be perpendicular to the axis of rotation 17. Starting from the first channel region 29, it extends radially outwards. Multiple hydraulic channels 28 can be present, such that there are multiple first channel regions 29 spaced apart from one another in the circumferential direction. The second channel regions 30 can be configured as a continuous annular channel 31 in the circumferential direction. This channel is in flow connection with a flow opening 32 which is arranged in a bearing, particularly a slide bearing. A region of the bearing can be seen which represents, for example, a bearing bush 33 or a slip ring. The bearing bush 33 rests tightly against an outer circumference of the output shaft 4, such that hydraulic fluid can be applied to the hydraulic chamber 27 via the hydraulic channel 28 from the flow opening 32.

(14) The described embodiment of the drive device 1 has the advantage that it is extremely compact in the axial direction with respect to the axis of rotation 17, primarily due to the integration of the vibration damper 10 in the clutch 6. The clutch 6 is operated using the actuator 24, which comprises the hydraulic cylinder 25 and the hydraulic piston 26 for this purpose. The hydraulic piston 26 is connected to the plate pack 22 of the clutch 6 via a coupling element 34. The coupling element 34 extends through the outer plate carrier 14, particularly through the first carrier element 15, in the axial direction. In the embodiment shown here, there is also a spring element 35 which acts on the first carrier element 15 on the one hand and on the coupling element 34 on the other hand. The spring element 35 pushes the coupling element 34 in the direction of the hydraulic piston 26, particularly in such a way that the coupling element 35 rests against the hydraulic piston 26, preferably permanently. The spring element 35 pushes the coupling element 34 away from the plate pack 22, provided that the hydraulic piston 26 or its position allows this. The spring element 35 can accordingly also be called a return spring.

LIST OF REFERENCE NUMERALS

(15) 1 drive device

(16) 2 1st drive unit

(17) 3 2nd drive unit

(18) 4 output shaft

(19) 5 piston

(20) 6 clutch

(21) 7 driven shaft

(22) 8 gear

(23) 9 gear stage

(24) 10 vibration damper

(25) 11 intermediate shaft

(26) 12 toothing

(27) 13 bearing

(28) 14 outer plate carrier

(29) 15 1st carrier element

(30) 2nd carrier element

(31) 17 axis of rotation

(32) 18 damping element

(33) 19 outer plate

(34) 20 inner plate

(35) 21 inner plate carrier

(36) 22 plate pack

(37) 23 fastening element

(38) 24 actuator

(39) 25 hydraulic cylinder

(40) 26 hydraulic piston

(41) 27 hydraulic chamber

(42) 28 hydraulic channel

(43) 29 1st channel region

(44) 30 2nd channel region

(45) 31 annular channel

(46) 32 flow opening

(47) 33 bearing bush

(48) 34 coupling element

(49) 35 spring element