DE102021127040A1 - belt transmission - Google Patents

Abstract

The invention relates to a belt transmission (4) for a drive train (29), comprising a transmission input shaft (30) with a first pair of conical pulleys (31); a transmission output shaft (33) with a second pair of pulleys (32); a belt (34) by which the first pair of pulleys (31) is torque-transmittingly connected to the second pair of pulleys (32) with variable ratio; a slide rail (3), wherein the slide rail (3) bears transversely against the wrapping means (34) at least on one side in order to dampen the wrapping means (34); wherein a gear housing (35) at least partially encloses the conical disk pairs (31, 32), the belting means (34) and the slide rail (3), the slide rail (3) being tiltably mounted on a holding tube (2), and the holding tube (2 ) has a channel (21) through which a hydraulic fluid (20) can flow, with a first channel outlet (22) directed towards the belt (34), an opening (5) being formed in the holding tube (2) as the first channel outlet (22), An axially displaceable slide (6) with a channel (7) running radially to the holding tube (2) is arranged on the holding tube (2), which hydraulically connects the groove (7) with a spray opening (8) formed on the slide (6) for the hydraulic fluid (20) connects.

Description

The present invention relates to a belt transmission for a drive train, comprising a transmission input shaft with a first pair of conical disks, a transmission output shaft with a second pair of conical disks, an endless belt, by means of which the first pair of conical disks is connected to the second pair of conical disks with a variable transmission ratio in a torque-transmitting manner; a slide rail, wherein the slide rail bears transversely against the belt means at least on one side in order to dampen the belt means; wherein a transmission housing at least partially encloses the pairs of conical disks, the belt and the slide rail, the slide rail being mounted tiltably on a holding tube, and the holding tube having a channel through which hydraulic fluid can flow with a first channel outlet directed towards the belt.

Such a belt transmission regularly comprises at least a first pair of conical pulleys and a second pair of conical pulleys, each with a first conical pulley that can be displaced along the shaft axis, also known as a loose pulley or movable pulley, and a second conical pulley that is stationary in the direction of the shaft axis, also known as a fixed pulley, with the torque transmission between The belt means provided for the pairs of conical disks as a result of a relative axial movement between the loose disk and the fixed disk as a result of the conical surfaces runs on a variable effective circle, i.e. with a variable running radius. As a result, a different speed transmission and torque transmission from one pair of conical pulleys to the other pair of conical pulleys can be continuously adjusted.

Such belt transmissions have long been, for example from the DE 100 17 005 A1 , known. During operation of the belt transmission, the belt means is shifted in a radial direction by means of the relative axial movement of the conical disks, ie on the conical disk pairs, between an inner position (small effective circle) and an outer position (large effective circle). The belting device forms a strand between the two pairs of conical pulleys, with one of the strands forming a tight strand and the other strand forming a push strand or a tight strand and a slack strand, depending on the configuration of the direction of rotation of the conical pulley pairs.

In such continuously variable transmissions, at least one damper device is provided in the installation space between the conical disk pairs. Such a damper device can be arranged on the tight strand and/or on the push strand of the belt and serves to guide and thus limit vibrations of the belt.

A damper device is designed, for example, as a sliding rail or as a sliding guide with a contact surface on the inside only on one side, mostly due to the installation space (transversal to the belt means), ie between the two strands. Alternatively, the damper device is designed as a slide rail or with a contact surface on both sides, i.e. both on the outside, i.e. outside of the wrap circle formed, and on the inside contact surface for the strand of the belt means in question.

Such slide rails are generally arranged such that they can be tilted on a holding tube, the holding tube having a channel through which hydraulic fluid can flow, with a first channel outlet directed towards the belt, in order to oil the belt.

For example, it is known to lubricate the belt means in such belt transmissions by means of two bores in one of the two holding tubes. To do this, the slide rails must be free in the area of the retaining tongue's loss protection. If the slide rails do not move axially, this exemption does not cause any problems. However, if chain-guided slide rails are used, which are acoustically favorable, the release for the oil jet can usually only be implemented with difficulty due to the axial movement.

The object of the invention is therefore to provide a belt transmission in which, despite the axial movement of a chain-guided slide rail, clearance between the channel outlets in the holding tubes and the pulley shafts of the belt transmission can be ensured.

This object is achieved by a belt transmission for a drive train, comprising a transmission input shaft with a first pair of conical disks, a transmission output shaft with a second pair of conical disks, an endless belt, by means of which the first pair of conical disks is connected to the second pair of conical disks with variable transmission in a torque-transmitting manner; a slide rail, wherein the slide rail bears transversely against the belt means at least on one side in order to dampen the belt means; wherein a transmission housing at least partially encloses the pairs of conical disks, the belt means and the slide rail, the slide rail being tiltably mounted on a holding tube, and the holding tube has a channel through which hydraulic fluid can flow, with a first channel outlet directed towards the belt means, with an opening being formed in the holding tube as the first channel outlet, with an axially displaceable slide having a channel running radially with respect to the holding tube being arranged on the holding tube, which hydraulically presses the groove connects to a spray opening formed on the slide for the hydraulic fluid.

This achieves the advantage that it can be ensured that the oiling hole remains free relative to the slide rail due to a corresponding axial displaceability of the slide relative to the holding tube.

According to an advantageous embodiment of the invention, it can be provided that the slide is formed as a cylinder sleeve which encloses the holding tube at least in sections with play.

According to a further preferred further development of the invention, it can also be provided that the slide has a channel element which projects radially out of the cylinder sleeve.

Furthermore, according to a likewise advantageous embodiment of the invention, it can be provided that the channel element is guided in the axial direction on both sides on the slide rail.

According to a further particularly preferred embodiment of the invention, it can be provided that the radially running channel of the slide engages in the opening of the holding tube and thus an axial guidance of the slide relative to the holding tube is realized.

Furthermore, the invention can also be further developed in such a way that the slide is formed as a cylinder sleeve and is surrounded by a correspondingly formed holding tube with play, at least in sections.

In a likewise preferred embodiment variant of the invention, it can also be provided that the slide has a permanent magnet which interacts with a ferromagnetically active component on the slide rail or the slide rail has a permanent magnet which interacts with a ferromagnetically active component on the slide.

It can also be advantageous to further develop the invention in such a way that the channel of the slide and the opening of the holding tube are designed such that the flow cross section through the channel and the opening varies over the axial position of the slide to the holding tube.

According to a further preferred embodiment of the subject matter of the invention, it can be provided that the holding tube is fixed axially in the transmission housing.

Finally, the invention can also be implemented in an advantageous manner such that the opening is designed as a groove oriented in the axial longitudinal extension of the holding tube.

The invention will be explained in more detail below with reference to figures without restricting the general inventive idea.

• 1 ein Kraftfahrzeug mit einem Umschlingungsgetriebe in einer schematischen Darstellung,
• 2 ein Umschlingungsgetriebe mit einer Gleitschiene in einer schematischen Darstellung,
• 3 eine erste Ausführungsform eines Umschlingungsgetriebes in einer Axialschnittansicht,
• 4 eine erste Ausführungsform eines Umschlingungsgetriebes in einer perspektivischen Axialschnittansicht,
• 5 eine erste Ausführungsform eines Halterohrs und Schiebers in einer perspektivischen und einer Axialschnittdarstellung,
• 6 eine zweite Ausführungsform eines Halterohrs und Schiebers in einer perspektivischen und einer Axialschnittdarstellung,
• 7 eine dritte Ausführungsform eines Halterohrs und Schiebers in einer perspektivischen und einer Axialschnittdarstellung,
• 8 eine vierte Ausführungsform eines Halterohrs und Schiebers in einer perspektivischen Darstellung.

It shows:

• 1 a motor vehicle with a belt transmission in a schematic representation,
• 2 a belt transmission with a slide rail in a schematic representation,
• 3 a first embodiment of a belt transmission in an axial sectional view,
• 4 a first embodiment of a belt transmission in a perspective axial section view,
• 5 a first embodiment of a holding tube and slider in a perspective and an axial section view,
• 6 a second embodiment of a holding tube and slider in a perspective and an axial sectional view,
• 7 a third embodiment of a holding tube and slider in a perspective and an axial sectional view,
• 8th a fourth embodiment of a holding tube and slider in a perspective view.

In the 1 a drive train 29 is arranged in a motor vehicle 38 with its motor axis 43 transversely to the longitudinal axis 42 in front of the driver's cab 41 . In this case, the continuously variable transmission 4 is connected on the input side to the output shaft 37 of a drive unit 36 . On the output side, the continuously variable transmission 4 is connected to an output shown purely schematically, so that here a left drive wheel 39 and a right drive wheel 40 are supplied with torque from the drive unit 36 with a variable transmission ratio. The drive unit 36 is shown here purely as an example as a three-cylinder internal combustion engine

2 showed a detailed view of the 1 known belt transmission 4, which is arranged in a transmission housing 35. A first pair of conical disks 31 is arranged on a transmission input shaft 30 and a second pair of conical disks 32 is arranged on a transmission output shaft 33 . A first effective circle 55 with a first running radius 57 is set on the first conical disk pair 31 , and a second effective circle 56 with a second running radius 58 is set on the second conical disk pair 32 . A belt means 34 runs, for example in the direction of travel 54, on the first effective circuit 55 and the second effective circuit 56 and thus transmits a torque from the transmission input shaft 30 to the transmission output shaft 33 with a transmission ratio corresponding to the ratio of the first effective circuit 55 to the second effective circuit 56. The running direction 54 shown corresponds to an input torque via the transmission input shaft 30 and an embodiment of the belt transmission 4 as a traction mechanism. When torque is input via the transmission input shaft 30 and the belt 34 is designed as a push belt, the running direction 54 is reversed, but the (here) upper strand remains the load strand 59. The conventional slide rail 3 is tiltably mounted on a holding tube 2 by means of a holding tube mount, so that it can be tilted the active circles applied in each case on the conical disk pairs and the resulting tangential alignment of the guided run of the belt means 34 can be freely adjusted. The holding tube 2 is fixed axially in the transmission housing 35 .

3 shows an axial section through the 2 known belt transmission 4. The 4 also shows a belt transmission 4 for a drive train 29, comprising a transmission input shaft 30 with a first pair of conical pulleys 31; a transmission output shaft 33 with a second pair of pulleys 32; a belt 34 by which the first pair of pulleys 31 is torque-transmittingly connected to the second pair of variable-ratio pulleys 32; a slide rail 3, wherein the slide rail 3 bears transversely against the belt means 34 at least on one side in order to dampen the belt means 34; A transmission housing 35 encloses the conical disk pairs 31, 32, the belt 34 and the slide rail 3 at least in sections, with the slide rail 3 being tiltably mounted on a holding tube 2, and the holding tube 2 has a channel 21 through which a hydraulic fluid 20 can flow, with a channel 21 on the belt 34 directed first channel outlet 22 has.

As if from a synopsis of 3-5 shows, an opening 5 is formed in the holding tube 2 as a first channel outlet 22, with an axially displaceable slide 6 having a channel 7 running radially to the holding tube 2 being arranged on the holding tube 2, which hydraulically connects the groove 7 with a spray opening formed on the slide 6 8 for the hydraulic fluid 20 connects. The slide 6 is in this case formed as a cylinder sleeve 9 which encloses the holding tube 2 at least in sections with play.

The slide 6 has a radially projecting from the cylinder sleeve 9 channel element 10 that is guided on both sides in the axial direction of the slide rail 3, which is well in the 3-4 reveals.

The 5 FIG. 1 also shows that the radially running channel 7 of the slide 6 engages in the opening 5 of the holding tube 2 and thus an axial guidance of the slide 6 relative to the holding tube 2 is realized. In the exemplary embodiment shown, the opening 5 is designed as a groove oriented in the axial longitudinal extension of the holding tube 2 .

6 shows another possible embodiment of a slide 6, which encloses the holding tube 2 in an axially movable manner. In this case, the opening 5 is designed as a bore, with an anti-rotation device between the slide 6 and the holding tube 2 being realized by a bayonet-like anti-rotation device. In this case, a pin formed on the holding tube 2 and extending in the radial direction from the lateral surface of the holding tube 2 engages in a corresponding axially extending guide groove of the slide 6 which is open on one side axially. The channel element 10 is shaped as a cylinder ring.

In the 7 an embodiment is shown in which the slide 6 is formed as a cylinder sleeve 9 and is enclosed within a correspondingly formed holding tube 2 with play by the latter. The slide 6 has a permanent magnet 11 which interacts with a ferromagnetically active component on the slide rail 3 so that the slide 6 can follow the axial movement of the slide rail.

8th showed a further development of the 7 known embodiment, in which the channel 7 of the slide 6 and the opening 5 of the holding tube 2 are designed such that the flow cross section through the channel 7 and the opening 5 varies over the axial position of the slide 6 to the holding tube 2. For this purpose, the opening 5 has a trapezoidal contour in the example shown.

The invention is not limited to the embodiments shown in the figures. The foregoing description is therefore not to be considered as limiting but as illustrative. The following claims are to be so ver stand that a said feature is present in at least one embodiment of the invention. This does not exclude the presence of other features. If the patent claims and the above description define 'first' and 'second' feature, this designation serves to distinguish between two features of the same type, without establishing a ranking.

Reference List

2

holding tube

3

sliding rail

4

belt transmission

5

opening

6

slider

7

channel

8th

spray port

9

cylinder sleeve

10

channel element

11

permanent magnet

20

hydraulic fluid

21

channel

22

channel exit

29

powertrain

30

transmission input shaft

31

pair of conical pulleys

32

pair of conical pulleys

33

transmission output shaft

34

means of restraint

35

gear case

36

drive unit

37

output shaft

38

motor vehicle

39

drive wheel

40

drive wheel

41

driver's cabin

42

longitudinal axis

43

motor axis

54

running direction

55

sphere of action

56

sphere of action

57

running radius

58

running radius

59

load strand

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was 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.

Patent Literature Cited

• DE 10017005 A1 [0003]

Claims (10)

Continuous transmission (4) for a drive train (29), comprising • a transmission input shaft (30) with a first pair of conical pulleys (31); • a transmission output shaft (33) with a second pair of conical disks (32); • a belt means (34) by means of which the first pair of conical pulleys (31) is connected to the second pair of conical pulleys (32) with variable transmission in a torque-transmitting manner; • a slide rail (3), wherein the slide rail (3) for damping the belt means (34) bears transversely on at least one side of the belt means (34); • a gear housing (35) enclosing the conical disk pairs (31,32), the belt (34) and the slide rail (3) at least in sections, • the slide rail (3) being tiltably mounted on a holding tube (2), • and that Holding tube (2) has a channel (21) through which hydraulic fluid (20) can flow, with a first channel outlet (22) directed towards the belt (34), characterized in that in the holding tube (2) there is an opening (5) as the first channel outlet (22), an axially displaceable slide (6) with a channel (7) running radially to the holding tube (2) being arranged on the holding tube (2), which hydraulically connects the opening (5) with a slide (6) trained spray opening (8) for the hydraulic fluid (20) connects. Belt drive (4) after claim 1 , characterized in that the slide (6) is formed as a cylinder sleeve (9) which encloses the holding tube (2) at least in sections with play. Continuous transmission (4) according to one of the preceding claims, characterized in that the slide (6) has a channel element (10) projecting radially out of the cylinder sleeve (9). Continuous transmission (4) according to one of the preceding claims, characterized in that the channel element (10) is guided in the axial direction on both sides on the slide rail (3). Belt drive (4) according to one of the preceding claims, characterized in that the radially extending channel (7) of the slide (6) engages in the opening (5) of the holding tube (2) and thus provides axial guidance of the slide (6) relative to the Holding tube (2) is realized. Continuous transmission (4) according to one of the preceding claims, characterized in that the slide (6) is formed as a cylinder sleeve (9) and is enclosed within a correspondingly formed holding tube (2) with play, at least in sections. Belt drive (4) according to one of the preceding claims, characterized in that the slide (6) has a permanent magnet (11) which interacts with a ferromagnetically active component on the slide rail (3) or the slide rail (3) has a permanent magnet (11) has, which interacts with a ferromagnetically active component on the slide (6). Belt transmission (4) according to one of the preceding claims, characterized in that the channel (7) of the slide (6) and the opening (5) of the holding tube (2) are designed in such a way that the flow cross section through the channel (7) and the Opening (5) varies over the axial position of the slide (6) to the holding tube (2). Continuous transmission (4) according to one of the preceding claims, characterized in that the holding tube (2) is fixed axially in the transmission housing (35). Continuous transmission (4) according to one of the preceding claims, characterized in that the opening (5) is designed as a groove oriented in the axial longitudinal extension of the holding tube (2).

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