TW201641849A - CVT transmission featuring improved controllability - Google Patents

Abstract

The invention relates to a CVT transmission comprising a V-pulley (2) that includes a stationary cone pulley (20) and an axially movable cone pulley (21), further comprising an adjustment device (5) for adjusting a position of the axially movable cone pulley (21), said adjustment device comprising: a bearing bush (8) on the axially movable cone pulley (21); a bearing arrangement (7) between the axially movable cone pulley (21) and the bearing bush (8); a spindle drive (3) having a spindle (30) and a spindle nut (31); a lever (4) that connects the spindle nut (31) to the bearing bush (8); and a servo drive (50) for driving the spindle drive (3). The CVT transmission also comprises a control unit (6) designed to actuate the adjustment device (5) in order for the position of the axially movable cone pulley (21) to be changed.

Description

CVT-transmission with improved controllability

The present invention relates to a CVT-transmission (a steplessly adjustable transmission) having significantly improved controllability and adjustability.

The prior art discloses different designs of CVT-transmissions. With a continuously variable transmission, a suitable gear ratio can be achieved in the vehicle compared to a transmission with a fixed gear. A particular field of application for such CVT-transmissions is small vehicles such as two-wheelers, tricycles, so-called spurs, snowmobiles, quads or scooters. In the case of such a CVT-transmission, a centrifugal force regulator is typically used to adjust the position of the belt on the pair of tapered washers. In this case, the centrifugal force of the centrifugal force adjuster moves its radial position according to the rotational speed, thereby changing the axial distance between the two tapered washers, thereby changing the transmission of the transmission. A disadvantage of such a device is that it is not possible to have a controllable or adjustable intervention of the transmission of the CVT-transmission. Therefore, the prior art CVT-transmission with a centrifugal force regulator is typically not operated at the optimum point, thus increasing fuel consumption and/or emissions of the vehicle. In view of this, it is advantageous to utilize this potential when using a centrifugally regulated CVT-transmission to reduce fuel and reduce emissions. In addition, in terms of vehicle dynamics, there is no optimal design for centrifugal force-regulated CVT-transmissions. Especially when the vehicle accelerates from a standstill and accelerates during the running of the vehicle (such as the elasticity from the first speed to the second speed), the centrifugal force-regulated CVT-transmission There is still room for improvement in the non-optimal gear ratio of the device.

The CVT-transmission of the present invention having the features of claim 1 is advantageous in that the emission characteristics and fuel consumption of the vehicle can be effectively improved. In addition, the driving performance is also significantly improved, in particular in terms of acceleration from the standstill and in terms of the acceleration of the vehicle during driving. According to the invention, this is achieved by operating the CVT-transmission in an optimized position. According to the invention, the CVT-transmission device here comprises a pair of tapered washers having a fixed-point tapered washer and an axially movable tapered washer. Furthermore, the transmission of the present invention includes adjustment means for adjusting the position of the axially movable tapered gasket. Wherein the adjustment device includes a bearing disposed between the axially movable tapered gasket and a bushing disposed on the axially movable tapered gasket. Thereby the shaft sleeve is prevented from rotating together with the crankshaft during operation. The adjustment device also includes a spindle drive mechanism having a spindle and a spindle nut and a lever member that connects the spindle nut to the sleeve. An actuator is provided to drive the spindle drive. The control unit is adapted to operate the adjustment device to change the position of the axially movable conical spacer. Thus, in accordance with the present invention, adjustments can be made through the control unit of the CVT-transmission to operate the CVT-transmission at an optimum operating point.

The dependent items show a preferred refinement of the invention.

Further preferably, the driven shaft of the actuator of the adjusting device is arranged parallel to the central axis of the tapered washer pair. This makes it possible to achieve a particularly compact construction.

To achieve a more compact construction of the transmission, the main shaft of the spindle drive is preferably arranged parallel to the central axis of the tapered washer.

Further preferably, the sleeve is provided with a recess for receiving the spindle nut and The ends of the rods that are connected together by the sleeve. The recess is preferably a groove.

Preferably, a torque arm is also provided which is coupled to the sleeve to prevent the sleeve from rotating together with the axially movable tapered washer.

The lever preferably has a lever extension that is hingedly supported on the thrust bearing by a hinge. Thereby increasing the adjustment force according to the principle of leverage. The torque arm is preferably supported on the motor module.

The control unit is preferably adapted to control the adjustment device based on characteristic parameters of the drive motor. Preferably, the rotational speed of the drive motor and/or the torque and/or temperature of the drive motor and/or air pressure are used as characteristic parameters of the drive motor. In this case, the characteristic parameters for controlling the adjustment device can be detected directly on the drive motor or on the component connected to the drive motor. The drive motor is preferably an internal combustion engine.

Further preferably, the control unit is adapted to control the adjustment device based on a driving mode selected by the driver. For example, a preset transmission setting value used by the adjustment device in a corresponding selected driving mode (such as a sport mode or a fuel economy mode or the like) may be stored.

Further preferably, the crankshaft passes through the pair of tapered washers. In this way, a particularly compact construction of the CVT-actuator can be achieved, in particular a particularly compact construction of the unit comprising the CVT-actuator and the drive motor.

The positionally fixed tapered washer is further preferably directly coupled to the crankshaft such that in the axial direction of the crankshaft, only minimal structural space is required for the CVT-transmission.

The invention also relates to a vehicle comprising a CVT-transmission of the invention. The vehicle is preferably a small vehicle, in particular a two-wheeled or tricycle or a snowmobile or a Quad or scooter or the like.

Further preferably, the actuator is disposed on the housing of the CVT-transmission. In this case, the driven shaft of the actuator preferably projects into the interior of the housing, and the intermediate transmission for adjusting the support wall is preferably arranged inside the housing.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

1‧‧‧CVT-transmission

2‧‧‧Conical gasket pair

3‧‧‧Spindle drive mechanism

4‧‧‧ rods

5‧‧‧Adjustment device

6‧‧‧Control unit

7‧‧‧ bearing device

8‧‧‧ bushings

10‧‧‧Drive motor

11‧‧‧ crankshaft

12‧‧‧Inclusive components

13‧‧‧ driven components

20‧‧‧Cone gasket

21‧‧‧Conical gasket

22‧‧‧ Back wall

30‧‧‧ Spindle

31‧‧‧ spindle nut

40‧‧‧ Rod extension

41‧‧‧Hinges

42‧‧‧ thrust bearing

50‧‧‧Executive agency

51‧‧‧ driven shaft

71‧‧‧ Bearings. First bearing

72‧‧‧bearing, second bearing

80‧‧‧ notch

81‧‧‧ torque arm

X-X‧‧‧ axial, central axis

1 is a cross-sectional view of a CVT-transmission device according to a first preferred embodiment of the present invention; FIG. 2 is a perspective view of the transmission device of FIG. 1; and FIG. 3 is a second preferred embodiment of the present invention. Cross-sectional view of the CVT-transmission.

The CVT-transmission device 1 of the first embodiment, that is, the continuously adjustable continuously variable transmission, will be described in detail below with reference to Figs.

As shown in FIG. 1, the CVT-transmission device 1 includes a tapered gasket pair 2 having a fixed tapered washer 20 and an axially movable tapered washer 21.

A fixed-point tapered washer 20 is fixed to the crankshaft 11. Specifically, as shown in FIG. 1, a fixed-point tapered washer 20 is disposed on the end of the crankshaft 11. As shown in Fig. 1, the crankshaft 11 is coupled to a drive motor 10, particularly an internal combustion engine.

According to the invention, in order to adjust the axially movable conical spacer 21, an adjustment device 5 is provided which is connected to the control unit 6. The adjustment device 5 includes an actuator 50, a driven shaft 51 of the actuator, and a spindle drive mechanism 3. The spindle drive 3 comprises a spindle 30 and a spindle nut 31 which is arranged in an axially movable manner on the spindle. The main shaft 30 is coupled to the driven shaft 51 or, alternatively, integrally formed with the driven shaft 51. Preferably, a bending moment arm is disposed on the main shaft nut 31, In order to improve stability.

As shown in Figure 1, the adjustment device 5 also includes a rod 4 that connects the spindle nut 31 to the sleeve 8. The sleeve 8 is positioned on the rear wall 22 of the axially movable conical spacer 21. In this case, the sleeve 8 comprises a recess 80 in the form of a groove into which the end of the rod 4 engages. Since the rod 4 is fixedly coupled to the spindle nut 31, the sleeve 8 also moves in the axial direction as the spindle nut 31 moves axially.

Furthermore, a bearing arrangement 7 having a first bearing 71 and a second bearing 72 is arranged between the sleeve 8 and the axially movable conical spacer 21. This prevents the sleeve 8 from rotating together with the axially movable conical spacer 21 or the crankshaft 11 during operation. In this case, the axial adjustment force is transmitted from the sleeve 8 through the two bearings 71, 72 to the axially movable conical spacer 21.

As shown in Fig. 2, a torque arm 81 is provided which is coupled to the sleeve 8 to prevent the sleeve 8 from rotating together with the axially movable tapered washer 21.

Actuator 50 is preferably an electric motor. As an alternative, the adjustment device 5 comprises a pneumatic adjustment mechanism or a hydraulic adjustment mechanism or an electromagnetic adjustment mechanism.

A containment member 12, such as a conveyor belt, is disposed between the two tapered gaskets 20,21. The containment member 12 is coupled to the driven member 13, preferably also to the tapered gasket pair. The driven element 13 can, for example, also be a directly driven wheel or the like.

Therefore, according to the present invention, the position of the movable tapered washer 21 can be adjusted by the control unit 6, thereby adjusting the axial distance between the two tapered washers 20, 21, which provides the desired of the CVT-transmission device. transmission. To this end, the drive actuator 50, the spindle drive 3, converts this rotation into an axial movement of the spindle nut 31. As shown by the double-headed arrow A in Fig. 1, the lever member 4 is rigidly coupled to the spindle nut 31, so that the lever member 4 is also moved in the axial direction X-X accordingly. Take this The sleeve 8 is moved axially and axially moved by the bearing means 7 to the axially movable conical spacer 21. Thus, the belt is guided further outward or further inward depending on the direction of rotation of the actuator 50 on the circumference of the conical spacers. Thereby achieving a stepless transmission.

In addition, it is not necessary to employ the centrifugal force elements of the prior art. This results in a structure that is less expensive and simple and reliable.

According to the invention, an optimized transmission of the transmission can be achieved in accordance with characteristic parameters, such as the rotational speed and/or torque of the drive motor 10 and/or temperature and/or air pressure. In this case, the transmission can be selected in view of consumption optimization or emission optimization or vehicle acceleration optimization. It is also possible to select any combination of outputs to be optimized and adjust the corresponding optimum transmission of the CVT-transmission accordingly.

Experiments on the CVT-transmission device 1 of the present invention have shown that 10% fuel consumption can be saved compared to a normal centrifugal-forced CVT-transmission device, and an acceleration of 0 to 60 km/h can be increased by 17%, and 20 The elasticity of acceleration up to 50 km/h is increased by 19%. The CVT-transmission device of the present invention requires a slightly larger mechanical and electrical structure due to the adjustment device, but the structure can be more greatly compensated by the improvements and savings described above.

Fig. 3 shows a CVT-transmission device according to a second embodiment of the invention, wherein the same or functionally identical components are given the same reference numerals. Unlike the first embodiment, the lever extension 40 is additionally provided in the second embodiment. The lever extension 40 is hingedly supported on the thrust bearing 42 via a hinge 41. Thereby, the lever member 4 is supported in an articulatable manner, thereby increasing the adjustment force of the spindle transmission mechanism 3 in accordance with the principle of the lever. This reduces the actuator 50 and enables the overall construction of the transmission in a relatively low cost and compact manner.

1‧‧‧CVT-transmission

2‧‧‧Conical gasket pair

3‧‧‧Spindle drive mechanism

4‧‧‧ rods

5‧‧‧Adjustment device

6‧‧‧Control unit

7‧‧‧ bearing device

8‧‧‧ bushings

10‧‧‧Drive motor

11‧‧‧ crankshaft

12‧‧‧Inclusive components

13‧‧‧ driven components

20‧‧‧Cone gasket

21‧‧‧Conical gasket

22‧‧‧ Back wall

30‧‧‧ Spindle

31‧‧‧ spindle nut

50‧‧‧Executive agency

51‧‧‧ driven shaft

71‧‧‧bearing, first bearing

72‧‧‧bearing, second bearing

80‧‧‧ notch

X-X‧‧‧ axial, central axis

Claims (12)

A CVT-transmission device comprising: a conical gasket pair (2) having a fixed tapered washer (20) and an axially movable tapered washer (21) for adjusting the axial movement Adjusting device (5) for the position of the tapered gasket (21), wherein the adjusting device (5) comprises: a sleeve (8) arranged on the axially movable tapered gasket (21), arranged a bearing device (7) between the axially movable tapered washer (21) and the bushing (8), having a spindle (30) and a spindle drive mechanism (3) of the spindle nut (31), a rod member (4) to which the spindle nut (31) is coupled with the sleeve (8), and an actuator (50) for driving the spindle transmission mechanism (3), and a control unit (6) adapted to The adjustment device (5) is manipulated to change the position of the axially movable conical spacer (21). A transmission device according to claim 1, characterized in that the driven shaft (51) of the actuator (50) is parallel to the central axis (X-X) of the pair of tapered washers (2). A transmission according to any one of the preceding claims, characterized in that the main shaft (30) of the spindle drive (3) is parallel to the central axis (X-X) of the pair of tapered washers (2). A transmission according to any of the preceding claims, characterized in that the sleeve (8) comprises a recess (80), in particular a recess, for receiving the end of the rod (4). A transmission according to any one of the preceding claims further comprising a torque arm (81) coupled to the sleeve (8) for support to prevent the sleeve from being axially movable The gasket (21) rotates together. A transmission according to any of the preceding claims, characterized in that the rod (4) comprises a rod extension (40), wherein the rod extension (40) is hinged by a hinge (41) The way is supported on the thrust bearing (42). A transmission device according to any of the preceding claims, characterized in that the control unit (6) is adapted to be based on characteristic parameters of the drive motor (10), in particular the rotational speed and/or torque of the drive motor and/or The adjustment device (5) is controlled by temperature and/or air pressure. A transmission according to any of the preceding claims, characterized in that the control unit (6) is adapted to control the adjustment device (5) based on a driving mode selected by the driver. A transmission according to any of the preceding claims, characterized in that the crankshaft (11) passes through the pair of tapered washers (2). A transmission according to any of the preceding claims, characterized in that the fixed-point tapered washer (20) is connected directly to the crankshaft (11), in particular at the end of the crankshaft (11) . A vehicle comprising a transmission as claimed in any of the preceding claims. A vehicle according to claim 11 is characterized in that the vehicle is a small vehicle, in particular a two-wheeled or tricycle or a snowmobile or a Quad or the like.