TWI695135B - Pneumatically adjustable CVT-transmission - Google Patents

Abstract

The invention relates to a CVT transmission device, which includes a pair of tapered gear discs (2) having at least one axially movable tapered gear disc (21); a tapered gear disc (21) for adjusting the axial move The adjusting device (5) of the position and the control unit (6) arranged to operate the adjusting device (5) in order to change the position of the axially movable conical gear disc (21), wherein the control unit (5) 6) A pneumatic pressure box (50) is included to adjust the axially movable conical gear plate (21) by pneumatic force.

Description

Pneumatically adjustable CVT-transmission

The invention relates to a pneumatically adjustable CVT-transmission device (steplessly adjustable transmission device), which is especially used for small vehicles, such as two-wheelers, tricycles, quad cars or snowmobiles, as well as an internal combustion engine and a vehicle.

Different designs of CVT drives are known from the prior art. Compared with a transmission device with a fixed gear, a continuously variable transmission device can achieve a suitable transmission ratio in the vehicle. A particular application area for such CVT-transmissions is small vehicles, such as two-wheelers, tricycles (so-called protruding vehicles), snowmobiles, Quad vehicles (four-wheel all-terrain vehicles) or scooters. When using such a CVT-transmission device, a centrifugal force regulator is usually used to adjust the position of the transmission belt on the pair of tapered gear wheels. In this case, the centrifugal force weight of the centrifugal force regulator moves its radial position according to the rotation speed, thereby changing the axial distance between the two tapered gear discs, and thereby changing the transmission of the transmission device. The disadvantage of this type of device is that it cannot actively control or adjust the transmission of the transmission of the CVT transmission. In this case, the advantage is a simple solution for the controllable or adjustable intervention of the transmission transmission of the CVT transmission, which can be used especially for small vehicles.

The CVT-transmission device of the present invention, which has the characteristics of item 1 of the patent application scope The advantage of the device is that the vehicle's emission characteristics and fuel consumption can be effectively improved, because the transmission ratio of the CVT transmission can be controlled or adjusted for intervention. Therefore, especially in the driving dynamics in terms of acceleration from a stationary state and acceleration of a moving vehicle, driving performance can be significantly improved. For this reason, according to the present invention, an adjusting device for adjusting the position of the axially movable cone gear plate is provided. The adjusting device is a pneumatic adjusting device, which adjusts the axially movable conical gear plate by aerodynamic force. In this way, the CVT drive can be operated at the optimal working point. In this case, the adjusting device includes a pneumatic pressure box connected to the axially movable conical gear plate so as to adjust the axially movable conical gear plate by aerodynamic force. In this way, a simple and compact structure can be achieved.

These ancillary items show the preferred improvement of the present invention.

The CVT transmission device preferably includes a negative pressure source, which is connected to the pressure tank. The negative pressure source provides the aerodynamic force required to adjust the axially movable conical gear disc. In this case, the source of negative pressure is particularly preferably the suction pipe of the internal combustion engine.

The pressure tank further preferably has the following structure: a movable piston is arranged in the pressure tank. In this case, the movable piston is preferably mechanically connected to the axially movable conical gear plate. In this way, the piston can be moved by applying pressure to the piston, thereby achieving the movement of the axially movable conical gear disc. Among them, the piston may be applied with overpressure or underpressure.

The pressure tank is further preferably connected to a bearing unit, wherein the axially movable conical gear plate is supported on the bearing unit. In this way, a particularly compact structure of the CVT transmission device is achieved.

The CVT transmission device preferably also includes centrifugal weights, which are arranged on the axially movable conical gear disc. In this case, these centrifugal weights are already heavy The transmission ratio corresponding to the rotation speed is provided according to the rotation speed of the axially movable conical gear plate, wherein the transmission can be finely adjusted by the adjustment device of the present invention. This makes it possible in particular to achieve a shorter switching time for changing the drive. This results in a particularly simple structure.

According to another preferred design of the present invention, the piston can be applied with overpressure or negative pressure on only one side in the pressure tank.

The invention also relates to an internal combustion engine, including the CVT transmission device of the invention. The internal combustion engine preferably includes at least one cylinder and a suction pipe leading to the cylinder, wherein the suction pipe is connected to the pneumatic adjustment device of the CVT transmission device in order to provide pneumatic power for adjusting the CVT transmission device. Among them, the suction tube is preferably connected to the pneumatic reservoir. In this way, the negative pressure can be used to pneumatically adjust the CVT transmission by using the suction tube. This is particularly advantageous because the internal combustion engine with a suction pipe already has a negative pressure, which can be used in addition to adjust the transmission transmission of the CVT transmission.

The adjustment device is further preferably constructed as a retrofit tool.

The invention also relates to a vehicle including the CVT transmission of the invention and/or the internal combustion engine of the invention.

The vehicle preferably has a frame, especially a vehicle tube or a vehicle tube group, and the vehicle frame is built as a pneumatic reservoir. For this purpose, a hollow frame is provided, in which overpressure or underpressure can be used as a pneumatic reservoir for providing pneumatic power for adjusting the CVT drive. This is particularly advantageous when using a two-wheeled or three-wheeled vehicle that usually has such a hollow frame. In this way, no other components for the pneumatic reservoir are required, but only a partial section of the hollow tube or the like is sealed pneumatically in order to be used as a pneumatic reservoir.

The vehicle of the present invention is preferably a small vehicle, especially a two-wheeled vehicle or a three-wheeled vehicle or Quad cars or snowmobiles or scooters or the like.

The embodiments of the present invention will be described in detail below with reference to the drawings.

1: CVT-transmission

2: Conical gear pair

3: Centrifugal force components

4: Support element

5: Adjustment device

6: control unit

7: negative pressure reservoir

8: Adjustment valve

9: Suction tube

10: Internal combustion engine

11: crankshaft

12: Inclusive component

13: driven element

14: Shell

15: Negative pressure zone

16: pipeline

17: pipeline

18: Check valve

19: Environment

20: Tapered gear disc

21: Tapered gear disc

22: contact surface

25: Normal pressure area

41: Sleeve area

50: pressure tank

51: Piston

52: Rod

53: inner sleeve

54: outer sleeve

55: Bearing

56: Bearing unit

80:2/2 directional valve

81: 2/2 directional valve

A: Arrow

1 is a schematic structural view of a CVT-transmission device for a small vehicle according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of the CVT-transmission device shown in FIG. 1, and FIG. 3 is a CVT-transmission shown in FIG. Schematic diagram of the adjustment valve of the device, and FIG. 4 is a schematic diagram of an alternative adjustment valve for the CVT-transmission device of the present invention.

The CVT-transmission device 1 according to the preferred embodiment of the present invention, that is, the continuously adjustable continuously variable transmission device, will be described in detail below with reference to FIGS. 1 to 3.

As shown in FIG. 1, the CVT-transmission device 1 includes a pair of tapered gear wheels 2 having a fixed tapered gear wheel 20 and an axially movable tapered gear wheel 21. The second pair of tapered gear wheels serves as the driven element 13. The pair of two tapered gear wheels are connected in a conventional manner through the containment member 12, in particular the drive belt.

The first tapered pair 2 is arranged on the crankshaft 11 of the internal combustion engine 10. In this case, the crankshaft 11 is fixedly connected to the fixed-position cone gear 20.

The CVT transmission 1 also includes centrifugal force elements 3 which are arranged on an axially movable conical gear plate 21. In this embodiment, the centrifugal force element 3 is a sphere. As an alternative, solid cylinders or hollow cylinders or similar elements can also be used.

Furthermore, the CVT-transmission 1 includes a support element 4 which is arranged movable in the axial direction Of the conical gear disc 21. In this case, the centrifugal force element 3 is arranged between the support element 4 and the axially movable conical gear plate 21. On the axially movable conical gear plate 21, a corresponding contact surface 22 is provided on a surface aligned with the support element 4, and the centrifugal force elements move along the contact surface.

In order to adjust the axial position of the axially movable cone gear 21, an adjusting device 5 is provided. The adjusting device 5 is set as a pneumatic adjusting device and includes a pneumatic pressure box 50 which is connected to an axially movable conical gear plate 21. The pressure tank 50 includes a piston 51 and a rod 52 arranged in the pressure tank. The rod is led out from the pressure tank 50. The rod 52 is connected to the bearing unit 56 on which the axially movable cone gear 21 is supported. The bearing unit 56 includes an inner sleeve 53, an outer sleeve 54, and a bearing 55 disposed between the inner sleeve and the outer sleeve.

As shown in FIG. 2, the inner sleeve 53 passes through the conical gear plate 20 in a fixed position. In addition, a cylindrical sleeve area 41 is provided on the support element 4 on which the inner sleeve 53 is arranged slidably. The inner sleeve 53 is fixedly connected to the axially movable conical gear plate 21.

In this case, the bearing 55 interrupts the transmission of the rotation of the crankshaft 11 to the adjustment device 5. The rotation of the crankshaft 11 is transmitted to the axially movable conical gear plate 21 through the sleeve region 41 and the inner sleeve 53.

The piston 51 in the pressure tank divides the internal area of the pressure tank into two areas, namely the negative pressure area 15 and the normal pressure area 25.

As shown in FIGS. 1 and 2, the pressure tank 50 is connected to the suction pipe 9 of the internal combustion engine 10. The suction tube 9 provides a source of negative pressure for the adjustment device 5.

The suction pipe 9 is connected to the negative pressure reservoir 7 through the first pipe 16. In this case, the negative pressure reservoir 7 is connected to the pressure tank 50 through the second line 17. Among them, an automatically closed check valve 18 is provided in the first pipeline 16. A controllable control valve 8 is provided in the second line 17. In this case, the control valve 6 is controlled by the control unit 6.

The crankshaft 11 is supported on the housing 14.

FIG. 3 is a detailed view of the adjustment valve 8. In this embodiment, the adjustment valve 8 is a 3/3 directional valve, on the one hand, the negative pressure zone 15 of the pressure tank 50 can be connected to the negative pressure reservoir 7, on the other hand, the negative pressure zone can be connected to the environment 19 connection. The third position of the 3/3 directional valve is the fully closed position shown in FIG. 3.

The piston 51 can be applied with negative pressure only on one side.

Therefore, depending on the position of the 3/3-way valve, the piston 51 can be adjusted in the direction shown by arrow A (see FIG. 2) or in the opposite direction. As an alternative, for example, a spring element arranged in the negative pressure region 15 of the pressure tank 50 can also be used for resetting.

Therefore, according to the invention, the negative pressure in the suction pipe 9 in the internal combustion engine 10 is used as a pneumatic energy source for adjusting the transmission of the CVT transmission 1. In this case, the pressure level in the suction pipe 9 depends on the position of the throttle valve tongue and the rotational speed of the internal combustion engine. Therefore, in the operation of the internal combustion engine, the negative pressure supply of the negative pressure accumulator 7 can be continuously ensured, and the axially movable conical gear plate 21 can be adjusted simply and safely by aerodynamic force.

The pressure box 50 is preferably arranged on the axial end of the crankshaft 11. In this way, a particularly compact and mechanically simple structure can be achieved.

In addition, the size and weight of the centrifugal force element 3 can also be reduced by about 20% by adjusting the transmission by negative pressure. Compared with the prior art, the weight reduction of the CVT transmission can be achieved in this way. In addition, by adjusting the CVT transmission by the pressure tank 50, the existing CVT transmission can be modified.

The negative pressure reservoir 7 is preferably arranged in the hollow frame of the vehicle. For this reason, in the vehicle No other space for the negative pressure reservoir is required.

Furthermore, in this first embodiment, the adjusting device 5 is arranged on the primary side of the CVT transmission, ie on the input side. As an alternative, the invention can also be applied on the secondary side, ie on the driven element 13.

In this way, the efficiency of the CVT-transmission device can be improved through the scheme for accurately adjusting the transmission of the transmission device of the present invention, which has a positive effect on exhaust emissions and fuel consumption.

FIG. 4 shows an alternative design of the adjustment valve. In this embodiment, the adjustment valve has two 2/2 directional valves 80, 81. Among them, one of the 2/2-directional valves is arranged between the negative pressure reservoir 7 and the pressure tank 50, and the other of the two 2/2-directional valves is arranged between the pressure tank 50 and the environment 19.

As described in these embodiments, the present invention is particularly applicable to small vehicles, such as two-wheeled or three-wheeled vehicles or Quad cars or snowmobiles or the like.

1: CVT-transmission

2: Conical gear pair

3: Centrifugal force components

5: Adjustment device

6: control unit

7: negative pressure reservoir

8: Adjustment valve

9: Suction tube

10: Internal combustion engine

11: crankshaft

12: Inclusive component

13: driven element

15: Negative pressure zone

16: pipeline

17: pipeline

18: Check valve

19: Environment

20: Tapered gear disc

21: Tapered gear disc

50: pressure tank

51: Piston

52: Rod

Claims (13)

A CVT-transmission device, comprising: a pair of conical gear wheels (2) having at least one axially movable conical gear wheel (21); a means for adjusting the position of the axially movable conical gear wheel (21) Adjustment device (5); a control unit (6) arranged to manipulate the adjustment device (5) in order to change the position of the axially movable conical gear disc (21), wherein the adjustment device (5) includes A pneumatic pressure box (50) to adjust the axially movable conical gear plate (21) by pneumatic force, and also includes a negative pressure source connected to the pressure box (50), the negative pressure source It is the suction pipe (9) of the internal combustion engine. The CVT-transmission device according to item 1 of the aforementioned patent application is characterized in that the pressure tank (50) includes a piston (51) arranged in the pressure tank. The CVT-transmission device according to item 1 of the aforementioned patent application is characterized in that the pressure tank (50) is connected to a bearing unit (56), wherein the axially movable conical gear plate (21) is supported on the bearing unit (56) On. The CVT-transmission device as claimed in item 3 of the patent scope is characterized in that the piston (51) of the pressure tank is connected to the bearing unit (56) through the rod (52). For example, the CVT-transmission device according to item 1 of the aforementioned patent application also includes centrifugal force elements (3), which are arranged on the axially movable conical gear plate (21). The CVT-transmission device as claimed in item 2 of the patent scope is characterized in that the piston (51) can be applied with negative pressure on only one side in the pressure tank (50). The CVT-transmission device as described in item 1 of the aforementioned patent application is characterized in that the adjustment device It is built as a modified tool. An internal combustion engine, including the CVT-transmission device according to any one of the patent application items 1 to 7. For example, the internal combustion engine of claim 8 includes the suction pipe (9) leading to the cylinder of the internal combustion engine. The aerodynamic force of the axially movable conical gear plate (21) is adjusted in the axial direction. An internal combustion engine as claimed in item 8 or 9 of the patent application is characterized in that a negative pressure reservoir (7) is arranged between the suction pipe (9) and the adjustment device (5). A vehicle including a CVT-transmission device according to any one of patent application items 1 to 7 and/or an internal combustion engine according to any one of patent application items 8 to 10. For example, the vehicle applying for item 11 of the patent scope also includes the frame, especially the tube, and the frame is built as a negative pressure reservoir. For example, the vehicle of claim 11 or 12 is characterized in that the vehicle is a small vehicle, especially a two-wheeled vehicle or a three-wheeled vehicle, a quad vehicle or a snowmobile.

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