DE102021125195A1 - 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 means of 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 belt (34) and the damper device (3), wherein the slide rail (3) is tiltably mounted on a holding tube (2), and the 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), the holding tube (2) having a hydraulic fluid extending out of the holding tube (2) in the radial direction (20) has a channel section (23) through which flow can take place, the first channel outlet (22) being formed in the channel section (23).

Description

The present invention relates to a belt transmission for a drive train, comprising a transmission input shaft with a first pair of conical pulleys; a transmission output shaft having a second pair of sheaves; a belt by which the first pair of pulleys is torque-transmittingly connected to the second pair of variable-ratio pulleys; 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 conical disk pairs, the belt and the damper device, the slide rail being tiltably mounted 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.

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.

• • eine Getriebeeingangswelle mit einem ersten Kegelscheibenpaar;
• • eine Getriebeausgangswelle mit einem zweiten Kegelscheibenpaar;
• • ein Umschlingungsmittel, mittels welchem das erste Kegelscheibenpaar mit dem zweiten Kegelscheibenpaar mit veränderbarer Übersetzung drehmomentübertragend verbunden ist;
• • eine Gleitschiene, wobei die Gleitschiene zum Dämpfen des Umschlingungsmittels zumindest einseitig transversal an dem Umschlingungsmittel anliegt;
• • wobei ein Getriebegehäuse die Kegelscheibenpaare, das Umschlingungsmittel und die Dämpfervorrichtung zumindest abschnittsweise einhaust,
• • wobei die Gleitschiene an einem Halterohr verkippbar gelagert ist,
• • und das Halterohr einen von einem Hydraulikfluid durchströmbaren Kanal mit einem auf das Umschlingungsmittel gerichteten ersten Kanalausgang aufweist,
• • wobei das Halterohr einen sich in radialer Richtung aus dem Halterohr herauserstreckenden von dem Hydraulikfluid durchströmbaren Kanalabschnitt aufweist, wobei in dem Kanalabschnitt der erste Kanalausgang ausgebildet ist.

This object is achieved by a/a belt transmission for a drive train, comprising

• • a transmission input shaft with a first pair of conical pulleys;
• • a transmission output shaft with a second pair of conical pulleys;
• • a belt by means of which the first pair of conical pulleys is torque-transmittingly connected to the second pair of conical pulleys with variable transmission;
• • 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 conical pulley pairs, the belt and the damper device,
• • wherein the slide rail is tiltably mounted on a holding tube,
• • and the holding tube has a channel through which a hydraulic fluid can flow, with a first channel outlet directed towards the belt,
• • wherein the holding tube has a channel section which extends out of the holding tube in the radial direction and through which the hydraulic fluid can flow, the first channel outlet being formed in the channel section.

By radially offsetting the channel outlet, it can be ensured that the slide rail feet move outside the spray area, thus ensuring that the belt means is always sufficiently oiled.

According to an advantageous embodiment of the invention, it can be provided that the first channel outlet and a second channel outlet are formed on the channel section, which can improve the oiling efficiency.

According to a further preferred further development of the invention, it can also be provided that the channel section is directed away from the slide rail in the radial extent.

Furthermore, according to a likewise advantageous embodiment of the invention, it can be provided that the first channel outlet and the second channel outlet each point in the direction of the extension of the belt, which can also lead to improved oiling of the belt. According to a further embodiment of the invention, which is particularly preferred in this context, provision can be made for the first channel outlet and the second channel outlet to be arranged opposite one another on the channel section.

Furthermore, the invention can also be further developed such that an outlet tube is arranged at the radially distal end of the channel section, the tube ends of which form the first channel outlet and the second channel outlet. In a likewise preferred embodiment variant of the invention, it can also be provided that a nozzle attachment is arranged on the radially distal end of the channel section, which nozzle attachment has the first channel outlet and the second channel outlet.

It can also be advantageous to further develop the invention in such a way that the channel section with the holding tube has a T-shaped basic shape.

According to a further preferred embodiment of the subject matter of the invention, it can be provided that the holding tube, the channel section, the outlet tube and/or the nozzle attachment is formed from a metallic material. Finally, the invention can also be implemented in an advantageous manner in that the slide rail is made of a plastic.

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 ein Umschlingungsgetriebe in einer perspektivischen Schnittansicht,
• 4 eine erste Ausführungsform eines Halterohrs in einer perspektivischen Ansicht,
• 5 eine zweite Ausführungsform eines Halterohrs in einer perspektivischen Ansicht.

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 belt transmission in a perspective sectional view,
• 4 a first embodiment of a holding tube in a perspective view,
• 5 a second embodiment of a holding tube 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. At torque on The direction of travel 54 is reversed when the transmission input shaft 30 is used and the belt means 34 is designed as a push belt, but the (here) upper strand remains the load strand 59 each applied active circles on the conical pulley pairs and the resulting tangential orientation of the guided strand of the belt 34 can be freely adjusted.

The 1 In other words, 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 enclosing the conical disk pairs 31, 32, the belting means 34 and the damper device 3 at least in sections, and the slide rail 3 being mounted on a holding tube 2 such that it can tilt.

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, wherein the holding tube 2 has a channel section 23 which extends out of the holding tube 2 in the radial direction and through which the hydraulic fluid 20 can flow and in the channel section 23 the first channel outlet 22 is formed. This is good in showing the 3 to see a perspective cross-sectional view of the from 2 known belt transmission 4 shows.

From the 3 It can also be seen that the first channel outlet 23 and a second channel outlet 24 are formed on the channel section 23 and the channel section 23 extends radially away from the slide rail 3 .

Like in the 3 shown, the first channel outlet 22 and the second channel outlet 24 each point in the direction in which the belt means 34 extends, and the first channel outlet 22 and the second channel outlet 24 are arranged opposite one another on the channel section 23 . In the 3 is also shown that an outlet tube 25 is arranged at the radially distal end of the channel section 23, the tube ends of which form the first channel outlet 22 and the second channel outlet 24.

This holding tube 2 is also once again in an exempted perspective view in FIG 4 shown.

An alternative embodiment of the holding tube 2 is in the 5 reproduced, in which a nozzle attachment 26 is arranged at the radially distal end of the channel section 23, which has the first channel outlet 22 and the second channel outlet 24.

It can be seen from the illustrations in the 4-5 It is also good that the channel section 23 with the holding tube 2 has a T-shaped basic shape. The holding tube 2, the channel section 23, the outlet tube 25 and/or the nozzle attachment is formed from a metallic material, while the slide rail 3 is made from a plastic.

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 patent claims are to be understood in such a way that a mentioned 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 similar features without establishing a ranking.

Reference List

2

holding tube

3

sliding rail

4

belt transmission

20

hydraulic fluid

21

channel

22

channel exit

23

canal section

24

channel exit

25

outlet pipe

26

nozzle attachment

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

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); • wherein a gear housing (35) at least partially encloses the conical disk pairs (31,32), the belt (34) and the damper device (3), • wherein the slide rail (3) is tiltably mounted on a holding tube (2), • and that Holding tube (2) has a duct (21) through which hydraulic fluid (20) can flow, with a first duct outlet (22) directed towards the belt (34), characterized in that the holding tube (2) has a radially extending out of the holding tube ( 2) has a channel section (23) extending out through which the hydraulic fluid (20) can flow, the first channel outlet (22) being formed in the channel section (23). Belt transmission (4) after claim 1 , characterized in that the first channel outlet (23) and a second channel outlet (24) are formed on the channel section (23). Continuous transmission (4) according to one of the preceding claims, characterized in that the channel section (23) is directed away from the slide rail (3) in the radial direction. Belt transmission (4) according to one of the preceding claims, characterized in that the first channel outlet (22) and the second channel outlet (24) each point in the direction in which the belt means (34) extends. Belt transmission (4) according to one of the preceding claims, characterized in that the first channel outlet (22) and the second channel outlet (24) are arranged opposite one another on the channel section (23). Belt transmission (4) according to one of the preceding claims, characterized in that an outlet tube (25) is arranged at the radially distal end of the channel section (23), the tube ends of which form the first channel outlet (22) and the second channel outlet (24). Belt transmission (4) according to one of the preceding claims, characterized in that a nozzle attachment (26) having the first channel outlet (22) and the second channel outlet (24) is arranged at the radially distal end of the channel section (23). Continuous transmission (4) according to one of the preceding claims, characterized in that the channel section (23) with the holding tube (2) has a T-shaped basic shape. Belt drive (4) according to one of the preceding claims, characterized in that the holding tube (2), the channel section (23), the outlet tube (25) and/or the nozzle attachment is formed from a metallic material. Continuous transmission (4) according to one of the preceding claims, characterized in that the slide rail (3) is made of a plastic.

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