TW201842284A - Pneumatically adjustable continuously variable transmission - Google Patents

Abstract

For a CVT comprising a cone pulley pair (2) having at least one axially movable cone pulley (21), an adjusting device (5) for adjusting a position of the axially movable cone pulley (21), and a control unit (6), which is designed to actuate the adjusting device (5) in order to vary the position of the axially movable cone pulley (21), wherein the adjusting device (5) comprises a pneumatic space (50), which is arranged on a rear side (22) of the axially movable cone pulley (21), with the result that a change in a pressure in the pneumatic space (50) brings about an axial movement of the axially movable cone pulley (21) in the axial direction (X-X), wherein centrifugal elements (3) are arranged on the axially movable cone pulley (21), wherein the pneumatic space (50) is defined by the rear side (22) of the axially movable cone pulley (21) and a front side (31) of a pulley housing (30), it is proposed that ramp-shaped supporting regions (32) are formed on the front side (31) of the pulley housing (30), wherein the centrifugal elements (3) are arranged between the axially movable cone pulley (21) and the ramp-shaped supporting regions (32).

Description

   Pneumatically adjustable stepless transmission   

The present invention relates to a pneumatically adjustable continuously variable transmission (CVT) for small vehicles such as two-wheeled vehicles, three-wheeled vehicles, four-wheeled locomotives, or tracked snowmobiles. An internal combustion engine and a vehicle. The invention relates to a pneumatically adjustable CVT, which has the characteristics of the pre-characterized clauses of the independent technical solution 1.

CVTs are known from the prior art in various specific examples. Compared with a transmission with a fixed speed, it is possible to achieve a suitable transmission ratio on the vehicle in each case by means of a stepless transmission. One specific area for the application of these CVTs is in small vehicles, such as two-wheeled vehicles, tricycles ("tuk-tuk"), tracked snowmobiles, four-wheeled locomotives or small-wheeled treadmills. In these CVTs, centrifugal governors are often used to adjust the position of the drive belt on a pair of tapered pulleys. Depending on the rotation speed, the radial position of the centrifugal weight of the centrifugal governor changes, thereby changing the axial distance between the two tapered pulleys, and as a result, the transmission ratio of the transmission is changed. However, one disadvantage of these configurations is that it is not possible to actively open-loop or closed-loop interfere with the transmission ratio of the CVT. It would be desirable here to have a simple way to have open-loop or closed-loop control interventions on the transmission ratio of a CVT that can be used especially on small vehicles.

DE 10 2015 214 153 A1 shows a CVT with a pneumatically adjustable device that adjusts an axially movable conical pulley by means of aerodynamics. For this purpose, an adjusting device is provided for adjusting the position of an axially movable conical pulley. The adjusting device is a pneumatically adjustable device that adjusts a conical pulley that can be moved axially by means of aerodynamic force. The adjustment device comprises a pneumatic space, which is arranged on the rear side of the conical pulley which can be moved axially. Here, the rear side of the tapered pulley that is axially movable is the side that is not in contact with the surrounding member of the CVT. By changing the pressure in the aerospace, the axial movement of the conical pulley is caused. Here, the pressure cancels or strengthens the force applied by the centrifugal element.

According to the present invention, a CVT is proposed. The CVT includes: a tapered pulley pair having at least one tapered pulley that can be moved axially; an adjustment device for adjusting a position of the tapered pulley that can be moved axially; and a control unit It is designed to actuate the adjustment device so that the position of the axially movable conical pulley changes. Here, the adjusting device includes a pneumatic space, which is arranged on a rear side of the axially movable conical pulley. As a result, a change in a pressure in the pneumatic space causes the axially movable An axial movement of the moving tapered pulley in the axial direction. Here, the centrifugal element is disposed on the axially movable conical pulley, wherein the aerospace is defined by the rear side of the axially movable conical pulley and a front side of a pulley housing. According to the present invention, a ramp-shaped support area is formed on the front side of the pulley housing, wherein the centrifugal elements are disposed between a conical pulley that is axially movable and the ramp-shaped support area.

Advantages of the invention

In contrast to the prior art, the CVT according to the invention having the features of claim 1 has the advantage that a particularly simple and compact pneumatic space is produced on the rear side of the conical pulley that can be moved axially. The aerodynamic space can be formed in a simple and compact manner by the rear side of the conical pulley and the pulley housing which can be moved axially. With the help of the ramp-shaped support area of the centrifugal element formed on the front side of the pulley housing, it is possible to eliminate other components which are arranged between the pulley housing and the axially movable conical pulley and have a slope-shaped support area, It is therefore also advantageous to save installation space. In addition, the centrifugal element can be advantageously guided in a stable manner by means of a ramp-like support area formed on the front side of the pulley housing, which contributes to a favorable and stable construction of the CVT. At the same time, the assembly of a CVT with a support area formed on the front side of the pulley housing is advantageously simple.

By means of the features indicated in the accompanying technical solutions, further advantageous specific examples and development of the invention are possible.

It is advantageous if the axially movable conical pulley is arranged at least partially within the pulley housing. Thus, an axially movable conical pulley can be advantageously moved in the axial direction within the pulley housing and in this way forms a variable aerodynamic space, which can be modified, for example, by pressure from the connection line. Therefore, the axially movable conical pulley acts as a kind of piston for adjusting the transmission ratio.

In an advantageous illustrative specific example, it is envisaged that a cylindrical housing wall is formed on the pulley housing, wherein the cylindrical pulley wall is formed on an axially movable conical pulley, wherein the cylindrical pulley wall is on the housing The inside of the wall is arranged radially in the overlapping area, and the housing wall and the pulley wall delimit the aerospace space in a radial direction with respect to the outside area. As a result, an advantageous flexible and variable aerodynamic space can be formed. At the same time, it is advantageously possible, for pneumatic spaces, in this way to rely solely on the axially movable conical pulley and the pulley housing in the axial direction towards the fixed conical pulley and away from the fixed cone The pulley is delimited in both the axial direction and the radial direction. Therefore, the axially movable conical pulley acts as a kind of piston for adjusting the transmission ratio.

It is advantageous if the sealing element is arranged between the pulley wall and the housing wall in the overlap region, wherein the sealing element surrounds the pulley wall in a ring shape. By means of such a sealing element, the pneumatic space can be advantageously well sealed in the overlap region. At the same time, the axially movable conical pulley can be advantageously moved in the axial direction relative to the pulley housing, while the seal in the overlap area is maintained.

In an advantageous illustrative specific example, a groove surrounding the pulley wall and in which a sealing element is arranged is formed in the pulley wall. Thus, the sealing element can be advantageously fixed in the pulley wall and moves with the tapered pulley in the overlap area during the axial movement of the axially movable tapered pulley relative to the pulley housing.

It is advantageous if the pulley housing is rotated together with an axially movable conical pulley. Therefore, the aerodynamic space defined by the axially movable conical pulley and the pulley housing also rotates.

In an advantageous illustrative specific example, it is envisaged that a middle region that is raised relative to the support region is formed between the ramp-like support regions on the front side of the pulley housing. These raised intermediate regions can advantageously serve as guides for linear movement of the conical pulleys and for torque transmission. Furthermore, the intermediate zone can, for example, also advantageously engage in a recess with a complementary design in the rear side of the axially movable conical pulley, with the result that the pulley housing advantageously rotates together with the axially movable conical pulley, And the torque can be transmitted from the crank shaft to the pulley housing and forward to the conical pulley that can be moved axially.

It is advantageous for the groove in the middle region in which the sliding element is arranged to be formed on the side wall of the middle region. Here, the sliding element is in contact with a conical pulley that can be moved axially. Therefore, advantageously simple and stable contact can be established between the axially movable pulley and the pulley housing, with the result that, for example, the pulley housing is advantageously rotated together with the axially movable tapered pulley. In this case, the sliding element can advantageously simplify the axial movement of the axially movable conical pulley, because, for example, the sliding element advantageously reduces friction. In addition, the sliding element advantageously functions as a shock absorber.

It also proves advantageous if the pulley housing has a one-piece design. In this way, a particularly simple and space-saving CVT can be provided with an advantageously reduced number of components.

In an advantageous illustrative specific example, the CVT further comprises a vacuum source, in particular an inlet pipe, which can be connected to a pneumatic space. The pneumatic adjustment device can be designed in a way to adjust a conical pulley that can be moved axially by means of a vacuum. When using a pneumatic receptacle, the vacuum is therefore advantageously stored in the pneumatic receptacle. The pneumatic reservoir can be connected to a vacuum source via a connection line.

Furthermore, the invention relates to an internal combustion engine comprising a CVT according to the invention. The internal combustion engine includes, for example, at least one cylinder and an inlet pipe to the cylinder, wherein the inlet pipe is connected to a pneumatic adjustment device of the CVT to provide aerodynamic power to adjust the CVT. Here, the inlet pipe can be connected to the pneumatic space. By using an inlet pipe, it is possible to use vacuum for pneumatically adjusting the CVT. This is particularly advantageous, since the vacuum exists in an internal combustion engine with an inlet pipeline under any conditions, and can additionally be used to set the transmission ratio of the CVT.

Furthermore, the invention relates to a vehicle comprising a CVT according to the invention and / or an internal combustion engine according to the invention. The carrier preferably has a carrier chassis, a sleeve or sleeve assembly in detail, which can be designed as a pneumatic receptacle. For this purpose, it is possible, for example, to provide a hollow frame in which additional pressure or vacuum can be used as a pneumatic reservoir to supply aerodynamic forces for adjusting the CVT. This situation is particularly advantageous when using two- or three-wheeled vehicles that typically have such a hollow frame. Therefore, no additional components are required for the pneumatic reservoir; all the components required are hermetically closing some sections of the hollow casing or the like in order to act as a pneumatic reservoir.

The vehicle according to the present invention is preferably a small vehicle, specifically a two-wheeled vehicle or a three-wheeled vehicle or a four-wheeled locomotive or a crawler snowmobile or a scooter or the like.

An illustrative specific example of the present invention is shown in the drawings and explained in more detail in the following description, wherein: FIG. 1 shows a schematic illustration of a CVT for a small vehicle according to a first illustrative specific example of the present invention, FIG. 2 shows a schematic section of the main drive through the CVT in FIG. 1, FIG. 3 shows an illustration of an illustrative specific example of the pulley housing of the CVT in FIGS. 1 and 2, and FIG. 4 shows an axially movable Description of an illustrative specific example of a conical pulley and a centrifugal element, FIG. 5 shows a schematic illustration of a regulating valve of a first illustrative specific example, and FIG. 6 shows a schematic illustration of a regulating valve according to a second illustrative specific example of the present invention Sexual description.

A CVT 1 according to a preferred illustrative embodiment of the present invention, that is, a stepless variable transmission is described in detail below with reference to FIGS. 1 to 5.

As can be seen from FIG. 1, the CVT 1 includes a first driving tapered pulley pair 2 having a fixed tapered pulley 20 and an axially movable tapered pulley 21. A second tapered pulley pair is provided as the output element 13. The two conical pulley pairs are connected to each other in a known manner by means of a surrounding member 12, in particular a transmission belt.

The first tapered pulley pair 2 is disposed on a crank shaft 11 of the internal combustion engine 10. In this configuration, the crank shaft 11 is connected to a fixed tapered pulley 20.

The CVT 1 further comprises a centrifugal element 3 which is arranged on a conical pulley 21 which can be moved axially. In this illustrative specific example, the centrifugal element 3 is a ball. In this illustrative specific example, for example, six centrifugal elements 3 are provided. However, of course, any number of centrifugal elements 3 may be provided. As an alternative, it is also possible to use a solid or air cylinder or the like. Here, the centrifugal element 3 is disposed on the rear side 22 of the tapered pulley 21 that is axially movable.

In order to adjust the axial position of the conical pulley 21 that can be moved axially, a pneumatic adjustment device 5 is now provided. The adjusting device 5 includes a pneumatic space 50 which is arranged on the rear side 22 of the conical pulley that can be moved axially. The adjusting device 5 is used for adjusting the axial position of the conical pulley 21 that can be moved axially.

As can also be seen from FIG. 1, the inlet pipe 9 of the internal combustion engine 10 is connected to the vacuum receptacle 7 through a first line 16. Here, the check valve 18 is disposed in the first line 16. The second line 17 is provided as a feed line to the pneumatic space 50 for pressure prevailing in the vacuum receptacle 7. The regulating valve 8 is arranged in the second line 17. The adjusting valve 8 is shown in detail in FIGS. 5 and 6. The control valve 8 is adjusted in accordance with the required transmission ratio of the CVT 1 by means of a control unit 6. The control unit 6 is designed to actuate the adjustment device 5 in order to change the position of the conical pulley 21 which can be moved axially.

It is therefore possible to adopt the fact that the vacuum existing in the inlet pipe 9 of the internal combustion engine 10 is used as aerodynamic energy to adjust the transmission ratio of the CVT 1. Here, the pressure level in the inlet pipe 9 depends on the position of the throttle valve and the speed of the internal combustion engine. During operation of the internal combustion engine, a continuous vacuum supply to the vacuum receptacle 7 can thus be ensured. The axially movable conical pulley 21 is thereby achieved by means of a simple and reliable adjustment of the aerodynamic force. Reset can be achieved by means of environmental pressure.

For example, the vacuum receptacle 7 may be disposed in the cavity of the carrier.

In the first illustrative specific example described, the adjustment device 5 is additionally arranged on the main side of the CVT, that is, on the input side. Alternatively, it is also possible for the adjustment device to be arranged on the secondary side of the CVT, ie on the drive element 13. As a further alternative, the adjustment device is arranged on the primary side and the secondary side.

The adjustment device 5 contains a pneumatic space 50. An illustrative specific example of the aerospace 50 is shown in FIG. 2 in a schematic section of the conical pulley pair 2 of the CVT 1. The tapered pulley pair 2 includes a fixed tapered pulley 20 and an axially movable tapered pulley 21. The pneumatic space 50 is disposed on the rear side 22 of the tapered pulley 21 that can be moved axially. The aerodynamic space 50 is thus delimited by the rear side 22 of the conical pulley 21 that can be moved axially. The aerodynamic space 50 is further delimited by the front side 31 of the pulley housing 30.

In this illustrative specific example, a cylindrical housing wall 33 is formed on the pulley housing 30. In this illustrative specific example, a cylindrical pulley wall 23 is formed on a tapered pulley 21 that is axially movable. The cylindrical pulley wall 23 is disposed in the overlap region 24 within the housing wall 33. The cylindrical pulley wall 23 of the tapered pulley 21 that is axially movable and the housing wall 33 of the pulley housing 30 are movable relative to each other in the axial direction X-X. When the axially movable conical pulley 21 is moved relative to the pulley housing 30 in the axial direction X-X, the size of the overlap region 24 changes. In this illustrative specific example, the pulley wall 23 and the housing wall 33 delimit the aerodynamic space 50 in the radial direction with respect to the outer region 28. The sealing element 53 is arranged between the pulley wall 23 and the housing wall 33 in the overlap region 24. In this initial specific example, the sealing element 53 surrounds the pulley wall 23 in a ring shape, with the result that the pulley wall 23 is always sealed with respect to the housing wall 33 in the radial direction, and thus forms a sealed pneumatic space 50. For this purpose, a groove 25 surrounding the pulley wall 23 is provided in the pulley wall 23, wherein the sealing element 53 is arranged in the groove 25. The sealing element 53 is in contact with the pulley wall 23 while completely surrounding the pulley wall 23, and is in contact with the housing wall 33 while completely surrounding the pulley wall 23. For example, the sealing element may be an O-ring, a shaft seal ring, a piston seal ring, or the like.

The front side 31 of the pulley housing 30 delimits the aerodynamic space 50 in the axial direction X-X. At the same time, the rear side 22 of the conical pulley 21 that can be moved axially delimits the aerodynamic space 50 in the axial direction X-X. The front side 31 delimits the aerodynamic space 50 in a direction opposite to the rear side 22 of the tapered pulley 21 that is axially movable.

During the operation of the CVT, the pulley housing 30 rotates with the conical pulley 21 that is axially movable. In this case, the axially movable conical pulley 21 is fixed to the outer sleeve 54, and the outer sleeve is movably arranged on the inner sleeve 55 in the axial direction X-X. The crank shaft 11, the pulley housing 30, the axially movable conical pulley 21 and the fixed conical pulley 21 therefore rotate at the same speed.

Regarding the axial direction X-X, the second sealing member 57 that completely surrounds the inner sleeve 55 is disposed on one side of the outer sleeve 54 facing away from the fixed tapered pulley 20 in this illustrative specific example. Regarding the axial direction X-X, a second sealing member 57 that completely surrounds the inner sleeve 55 is provided on one side of the outer sleeve 54 facing the fixed tapered pulley 20 in this illustrative specific example.

The pulley housing 30 is connected to the crankshaft 11 indirectly or alternatively, for example, by inserting a sealing element (not shown in the drawings) that completely surrounds the crankshaft 11. In this case, the crank shaft 11 passes through the pulley housing 30 and the tapered pulley 21 that can move axially.

By changing the pressure in the pneumatic space 50, the position of the tapered pulley 21 with respect to the axial direction X-X can be changed. For example, if the adjustment valve 8 connects the vacuum reservoir 7 to the pneumatic space 50, the pressure in the pneumatic space 50 is reduced, and as a result, the conical pulley 21 that can move axially moves axially in the direction of arrow A . During this process, the axially movable conical pulley 21 moves within the pulley housing 30. Although configured to be rotatable, the pulley housing is not configured to allow movement in the axial direction XX . Therefore, the distance between the axially movable tapered pulley 21 and the fixed tapered pulley 20 is increased, and as a result, the transmission belt is further moved in the direction of the crank shaft 11.

The centrifugal element 3 is further provided in a CVT, as illustrated in FIG. 2. In this state, the centrifugal element 3 is disposed on the rear side 22 of the tapered pulley 21 that is axially movable. In this illustrative specific example, the centrifugal element 3 is a ball. In this illustrative specific example, for example, six centrifugal elements 3 are provided. However, of course, any number of centrifugal elements 3 may be provided. As an alternative, it is also possible to use a solid or air cylinder or the like. The centrifugal weight 3 moves according to the speed of the conical pulley, and therefore requires only fine adjustment of the transmission ratio by means of a pneumatic adjustment device.

In order to support the centrifugal element 3 on the front side 31 of the pulley housing 30, a slope-shaped support region 32 is formed on the front side 31 of the pulley housing 30. The support area 32 has a slope-like design, wherein the support area 32 approaches the fixed conical pulley 20 in a radial direction from the crank shaft 11 to the housing wall 33. The centrifugal element 3 is disposed between the cone-shaped pulley 21 and the slope-shaped support region 32 that are axially movable. Therefore, the centrifugal element 3 is disposed in the pneumatic space 50.

An intermediate region 34 protruding in the axial direction X-X relative to the support region 32 is formed between the support regions 32 on the front side 31 of the pulley housing 30. The raised intermediate areas 34 between the support areas 32 are formed in a manner such that, for example, the raised intermediate areas 34 engage in the recesses 26 on the rear side 22 of the conical pulley 21 that is axially movable. It is formed in a complementary manner to the middle region 34. A recess 26 formed on the rear side 22 of the conical pulley 21 that is axially movable is shown in FIG. 4. The recess 26 is used to guide the raised intermediate region 34 during the axial movement of the axially movable conical pulley 21. With positive engagement of the raised intermediate zone 34 during the engagement in the recess 26, torque can be transmitted forward from the pulley housing 30 to the conical pulley 21 that can be moved axially. The other slope-shaped support area 27 on which the centrifugal element 3 rests is also formed on the rear side 22 of the conical pulley 21 which can be moved axially. The intermediate region 32 projects from the support region 32 in the direction of the fixed tapered pulley 20 with respect to the axial direction X-X. An illustrative specific example of a pulley housing 30 having a front side 31, a support area 32, a housing wall 33, and a middle area 34 is shown in FIG. The middle region 34 has a side wall 35. In this initial example, for example, the side wall 35 is oriented in the axial direction X-X. In this illustrative specific example, the middle region groove 36 is formed on the side wall 35. The sliding element 37 is disposed in the middle region groove 36. The sliding elements 37 are in contact with, for example, the conical pulley 21 that can be moved axially in the recess 26, and the sliding elements 37 can be moved axially when the axially movable cone 21 is axially adjusted The tapered pulley 21 slides. For example, the sliding element 37 can thus simplify the axial movement of the axially movable conical pulley 21 because the sliding element 37 reduces friction. The sliding element 37 is also used for damping.

As illustrated in FIG. 3, the pulley housing 30 has a one-piece design in this illustrative specific example. Therefore, the front side 31, the support area 32, and the housing wall 32 of the pulley housing 30 have an integrated design, and the pulley housing 30 is formed in this manner. In this illustrative specific example, the intermediate region 34 is also integrally formed with the front side 31, the support region 32, and the casing wall 33 of the pulley housing 30.

FIG. 5 shows an illustrative specific example of the regulating valve 8. In this illustrative specific example, the regulating valve 8 is a 3 / 3-way valve, wherein the regulating valve 8 can establish a connection to the vacuum reservoir 7 on the one hand, and a connection to the environment 19 (ambient pressure) on the other. The third position is the closed position of the adjustment valve 8, which is shown in FIG. 5.

The reduction in the distance between the axially movable conical pulley 21 and the fixed conical pulley 20 can then be achieved again by simply opening the adjustment valve 8 to establish a connection to the environment 19.

In this illustrative specific example, the second line 17 is configured in such a way that the second line 17 leads to the aerospace 50. By way of example, it is possible for the pipeline to be connected to the pneumatic space 50 via the crankshaft 11 and from the inside.

FIG. 6 shows an alternative specific example of the regulating valve 8, which in this illustrative specific example includes two 2 / 2-way valves 80, 81. Here, one of the two 2 / 2-way valves is disposed between the vacuum reservoir 7 and the pneumatic space 50, and the other of the two 2 / 2-way valves is disposed between the pneumatic space 50 and the environment 19. .

In detail, the present invention is used in a small vehicle such as a two-wheeled vehicle or a three-wheeled vehicle or a four-wheeled vehicle or a track-type snowmobile or the like.

Of course, other illustrative specific examples and hybrid forms of the illustrative specific examples shown are also possible.

Claims (12)

    A stepless variable speed transmission device includes a tapered pulley pair (2), which has at least one tapered pulley (21) that can be moved axially, and an adjustment device (5) for adjusting the axially A position of the ground-moving conical pulley (21), and a control unit (6) designed to actuate the adjustment device (5) so that the position of the axially movable cone-shaped pulley (21) A change occurs, wherein the adjusting device (5) includes a pneumatic space (50), which is disposed on a rear side (22) of the axially movable conical pulley (21), with the result A change in pressure for one of the pneumatic spaces (50) causes an axial movement of the axially movable conical pulley (21) in the axial direction (XX), wherein the centrifugal element (3) is disposed at On the axially movable conical pulley (21), the aerodynamic space (50) passes through the rear side (22) of the axially movable conical pulley (21) and a pulley housing ( 30) is defined by a front side (31), which is characterized in that a slope-shaped support area (32) is formed on the front side (31) of the pulley housing (30), wherein the centrifugal elements (3) are arranged on the shaft Move to ground Between the conical pulleys (21) with such ramp-like supporting area (32).         The stepless speed change transmission device according to claim 1, wherein the axially movable conical pulley (21) is at least partially disposed in the pulley housing (30).         The CVT according to claim 1 or 2, characterized in that a cylindrical housing wall (33) is formed on the pulley housing (30), wherein a cylindrical pulley wall (23) is formed on the axially On the moving conical pulley (21), the cylindrical pulley wall (23) is radially arranged in an overlapping area (24) in the housing wall (33), and the housing wall (33) and In this way, the pulley wall (23) delimits the aerodynamic space (50) in a radial direction relative to an outer zone (28).         The stepless speed change transmission device according to claim 3, characterized in that a sealing element (53) is arranged between the pulley wall (23) and the housing wall (33) in the overlapping area (24), wherein The sealing element (53) surrounds the pulley wall (23) in a ring shape.         The stepless speed change transmission according to claim 4, characterized in that a groove (25) surrounding the pulley wall (23) and in which the sealing element (53) is arranged is formed in the pulley wall (23).         The stepless speed change transmission according to any one of claims 1 to 5, characterized in that the pulley housing (30) rotates with the axially movable conical pulley (21).         The stepless speed change transmission according to any one of claims 1 to 6, characterized in that a middle area (34) protruding relative to the support areas (32) is on the front side of the pulley housing (30) (31) is formed between the slope-shaped support areas (32).         The stepless speed change transmission device according to claim 7, characterized in that the intermediate zone grooves (36) provided with the sliding elements (37) are formed on the side walls (35) of the intermediate zones (34), wherein the The equal sliding element (37) is in contact with the axially movable conical pulley (21).         The stepless speed change transmission device according to any one of claims 1 to 8, characterized in that the pulley housing (30) has an integrated design.         The stepless variable speed transmission according to any one of claims 1 to 9, further comprising a vacuum source, in particular an inlet pipe (9), which can be connected to the pneumatic space (50).         An internal combustion engine comprising a continuously variable transmission according to any one of claims 1 to 10.         A vehicle comprising a continuously variable transmission according to any one of claims 1 to 10 and / or an internal combustion engine according to claim 11.