KR100233681B1 - Belt stepless transmission - Google Patents

Abstract

The present invention relates to a belt pulley type endless continuously variable transmission, which is provided on an input shaft (5) for transmitting power of the engine (1) and whose drive diameter is selectively variable, the variable drive pulley (6) and the intermediate shaft (11). And a variable driven pulley (8) which is installed on the variable drive pulley (6) and is connected via the belt (7) and whose operating diameter is selectively variable to shift the power transmitted from the engine (1). A transmission mechanism 2; A power switching mechanism (3) installed in the planetary gear shaft (14) consisting of the planetary gear unit (13) and the forward clutch (16) and the reverse brake (17) for controlling the operation of the planetary gear unit (13) to form a third axis. ); External drive and driven gears (12, 15) for transmitting the power shifted from the transmission mechanism (2) to a power switching mechanism (3); It consists of a final drive gear (18) consisting of a final drive gear (18) connected to the ring gear (23) of the planetary gear unit (13) and a final driven gear (21) engaged with the final drive gear (18). In the continuously variable transmission of the present invention having such a structure, since the planetary gear unit 13 constituting the power switching mechanism 3 for controlling the power transmission direction is provided on the third shaft, the overall structure of the transmission can be simplified. In addition, since the space for installing control elements such as clutches and brakes for controlling the operation of the planetary gear unit 13 is increased, it is possible to install various operation control elements.

Description

Belt Pulley Type CVT

The present invention relates to a belt pulley continuously variable transmission, in particular, an operating element for controlling the forward and backward operation of the output and a planetary gear set are installed on the third shaft to shorten the length of the first shaft to which power is input. The present invention relates to a belt pulley continuously variable transmission capable of packaging the engine.

In general, a belt pulley type transmission using a belt and a pulley is capable of linearly varying the operating diameter of the pulley on which the belt is caught, and between the driving pulley and the driven pulley by linearly varying the operating diameter of the pulley. Since the shift is made linearly, it is widely used for continuously variable transmissions. In such a belt pulley type continuously variable transmission, the planetary gear unit and the planetary gear unit for switching the power transmission direction in the forward and reverse rotation directions are operated. Actuating elements, such as brakes or clutches, for the control must be provided.

In the conventional belt pulley continuously variable transmission, a second shaft is provided with a driven pulley for receiving power from an input shaft through which the planetary gear unit and an operating element for operating the planetary gear unit are powered from an engine or a drive pulley installed on the input shaft. Since the shaft is installed in the shaft, the length of the shaft is increased, which in turn causes the length and width of the transmission to increase.

In addition, there is a problem in the installation of the starting mechanism and the various selection of the starting mechanism to make the transmission of the power is made to transmit the power to the output shaft.

Therefore, such a transmission has a long length, and therefore, when it is installed in an automobile or the like, it is difficult to be universally installed in various kinds of vehicles, and there is a difficulty in selecting various starting mechanisms for starting the vehicle.

Accordingly, an object of the present invention is to provide a belt pulley continuously variable transmission that can solve the problems described above, shorten the overall width and length of the transmission, and allow various starting mechanisms to be applied.

The present invention for achieving the above object is, the variable drive pulley is installed on the input shaft which is driven by the driving force of the engine is variable in its operating diameter, and is connected and driven through the variable drive pulley and the belt Variable driven pulleys whose operating diameters are variable, external drive gears installed on the same shaft as the variable driven pulleys to transfer power shifted between the variable drive pulleys and the variable driven pulleys, which are driven by receiving power from the external drive gears. External driven gears, planetary gear units installed on the same shaft as the external driven gears, longitudinal reduction gears that output power finally shifted from the planetary gear units, and forward clutch and reverse brake for selectively controlling the operation of the planetary gear units. Consists of

In the continuously variable transmission of the present invention configured as described above, as the operating diameters of the variable drive pulley and the variable driven pulley connected to each other through the belt are linearly variable, the power transmitted from the engine is variable drive pulley and variable driven pulley. The variable power is linearly variable while passing therebetween, and the variable power is transmitted to the external driven gear through an external drive gear installed on the same shaft as the variable driven pulley, and the power transmitted to the external driven gear is According to the lock operation of the forward clutch or the lock operation of the reverse brake, the output shaft installed with the reduction gear is rotated forward or reverse as it is not transmitted through the planetary gear unit or through the planetary gear unit. It is supposed to.

Therefore, the continuously variable transmission according to the present invention includes a variable pulley having a means for varying the power of the engine, and the power transmitted through the external drive gear installed on the rotating shaft of the variable pulley according to the selective operation of the forward clutch and the reverse brake. Forward or reverse rotation is transmitted to the output shaft.

As described above, the continuously variable transmission according to the present invention has a planetary gear unit that controls the direction of power transmission and an actuating element that controls the operation of the planetary gear unit is installed on the third shaft. Can be shortened.

In addition, as described above, the planetary gear unit and the operating element are installed on the third shaft, so that various starting mechanisms can be additionally installed without lengthening the length of the first shaft.

1 is a schematic cross-sectional view schematically showing the basic arrangement of the continuously variable transmission according to the present invention;

2 is a schematic cross-sectional view showing an arrangement of another embodiment of a continuously variable transmission according to the present invention;

Figure 3 is a schematic cross-sectional view showing an arrangement of another embodiment of a continuously variable transmission according to the present invention,

4 is a schematic cross-sectional view showing an arrangement structure in which the continuously variable transmission shown in FIG. 3 is modified.

5 is a flowchart illustrating a power transmission process of the continuously variable transmission according to the present invention.

Explanation of Reference Symbols in the Drawings

1-engine 2-transmission

3-Power change mechanism 4-Reducer

5-Input Shaft 6-Variable Drive Pulley

7-Belt 8-Variable driven pulley

9-implement 10-implement

11-Intermediate Shaft 12-External Drive Gear

13-Planetary Gear Unit 14-Planetary Gear Shaft

15-Externally Driven Gear 16-Forward Clutch

17-Reverse Brake 18-Final Drive Gear

19-Differential Gear 20-Output Shaft

21-Final Drive Gear 22-Sun Gear

23-Ring Gear 24-Carrier

25-Pinion 26-Pinion Carrier

27-Transmission housing 28-Carrier

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

1 to 4 are schematic views showing, in cross-sectional form, the structure of each embodiment of the infinitely variable transmission according to the present invention. As shown in these figures, the continuously variable transmission of the present invention is transferred from the engine 1. A transmission mechanism (2) for shifting power, a power switching mechanism (3) for switching the transmission direction of power shifted in the transmission mechanism (2) in the forward and reverse directions, and the power switched in the power switching mechanism (3) Finally, it consists of a longitudinal reducer (4) to decelerate and output.

The transmission mechanism 2 is provided on an input shaft 5 which transmits power of the engine 1, and has a variable drive pulley 6 whose operating diameter is selectively variable, and the variable drive pulley 6. It is composed of a variable driven pulley 8 that is connected via a belt 7 and whose operating diameter is selectively variable.

On the other hand, the variable drive pulley (6) and the variable driven pulley (8) is provided with an operating mechanism (9, 10) for varying the operation diameter, each pulley in accordance with the selective operation of the operating mechanism (9, 10) The point where the belt 7 of 6 and 8 hangs becomes variable. Here, the operating diameter of each pulley (6, 8) is the operating diameter of the variable drive pulley (6) becomes larger, the operating diameter of the variable driven pulley (8) becomes smaller, and the operating diameter of the variable drive pulley (6) is variable By increasing the operating diameter of the driven pulley 8, power is transmitted to both pulleys 6 and 8 on which the belt 7 fixed in length is engaged.

Accordingly, the power transmitted from the engine 1 to the variable drive pulley 6 is variably transmitted to the variable driven pulley 8 according to the selective operation of the actuating mechanisms 9 and 10, so that the shift is made.

On the other hand, the external drive mechanism 12 is provided on the intermediate shaft 11 on which the variable driven pulley 8 is installed, and the external drive gear 12 is provided with a planetary gear unit 13 and is third in number. The external driven gear 15 provided on the planetary gear shaft 14 constituting the shaft is engaged to transmit the power shifted by the transmission mechanism 2 to the planetary gear unit 13.

The power transmission mechanism 3 includes a planetary gear unit 13 and a forward clutch 16 and a reverse brake 17 for controlling the operation of the planetary gear unit 13.

In addition, the longitudinal reduction gear 4 is engaged with the final drive gear 18 and the final drive gear 18 is driven by receiving the power shifted from the power transmission mechanism 3, the output shaft is provided with a differential gear (19) It consists of a final driven gear 21 for transmitting power to the (20).

In the structure of the continuously variable transmission of the present invention having the structure as described above, the present invention shown in Figure 1 according to the connection structure of each gear element and the operating element of the planetary gear unit 13 constituting the power transmission mechanism (3) To the fourth embodiment shown in FIG.

In the first embodiment of the present invention shown in FIG. 1, the sun gear 22 of the planetary gear unit 13 is fixed to the planetary gear shaft 14, and the ring gear 23 is connected to the carrier 24 through the carrier 24. FIG. It is connected to the final drive gear 18, the forward clutch 17 is installed between the pinion carrier 26 and the planetary gear shaft 14, which supports the pinion 25 of the planetary gear unit (13). On the other hand, the reverse brake 17 has a structure provided between the pinion carrier 26 and the transmission housing 27.

In the continuously variable transmission according to the first embodiment of the present invention having such a structure, when the forward clutch 16 is locked, the pinion 25 of the planetary gear unit 13 passes through the forward clutch 16 to form a planetary gear shaft ( Since power is directly transmitted from 14, the sun gear 22 and the pinion 25 of the planetary gear unit 13 rotate at the same speed, and thus the power is transferred from the pinion 25 to the ring gear 23. It is transmitted to drive the final drive gear 18 connected to the ring gear 23.

That is, the power of the engine 1 is transmitted to the variable drive pulley 6 to drive the variable drive pulley 6 in the forward direction, and thus are connected to each other through the variable drive pulley 6 and the belt 7. The variable driven pulley 8 is driven in the forward direction, and the external driven gear 12 provided on the intermediate shaft 11 together with the variable driven pulley 8 also rotates forward similarly to the variable driven pulley 8. .

Then, the external driven gear 15 meshed with the external drive gear 12 is reversely rotated, and the sun gear 22 and the sun gear 22 provided on the same planetary gear shaft 14 as the external driven gear 15 are rotated. The pinion 25, which is connected to each other through the planetary gear shaft 14 and the forward clutch 16, is also rotated in reverse. As the pinion 25 and the sun gear 22 rotate in the same direction, the pinion 25 is rotated. The ring gear 23 meshed with the outer side of the pin also rotates in the same direction as the pinion 25.

Accordingly, the final drive gear 18 connected through the ring gear 23 and the carrier 24 is reversed, and the final driven gear 21 meshed with the final drive gear 18 is rotated forward. The output shaft 20 in which the final driven gear 21 is installed is rotated forward.

On the other hand, when the reverse brake 17 is locked, the pinion carrier 26 connected to the reverse brake 17 does not rotate and is fixed. Therefore, the pinion 25 installed in the pinion carrier 26 is in a state capable of rotating only without rotation, so that power transmission in the opposite direction is made between the sun gear 22 and the pinion 25. The pinion 25 transmits power to the ring gear 23 to rotate the ring gear 23 in the same direction as the pinion 25.

Therefore, as described above, when the power transmitted from the engine 1 to the external driven gear 15 is transmitted in the reverse direction, the reverse power is also transmitted to the sun gear 22 of the planetary gear unit 13. The pinion 25 and the ring gear 23 meshed with the sun gear 22 rotate in the forward rotation direction, and the final drive gear connected to the ring gear 23 through the carrier 24. 18 is driven in the forward rotation direction. As a result, the final driven gear 21 meshed with the final drive gear 18 is rotated in the reverse rotation direction, so that the reverse is achieved.

As shown in FIG. 2, the second embodiment of the present invention includes a carrier 24 and a planetary gear shaft 14 connecting the ring gear 23 and the final driving gear 18 of the planetary gear unit 13. The forward clutch 16 is installed between the) and the reverse clutch 17 installed in the transmission housing 27 is connected to the pinion 25 of the planetary gear unit 13 via the pinion carrier 26. .

That is, the second embodiment of the present invention differs from the first embodiment only in that the forward clutch 16 is connected to the carrier 24 connecting the ring gear 23 and the final drive gear 18. Do.

According to the second embodiment of the present invention having such a structure, when the forward clutch 16 is locked, the planetary gear shaft 14 is moved from the transmission mechanism 2 through the external drive gear 12 and the external driven gear 15. Power that has been transmitted to is transmitted to the final drive gear 18 directly through the locked forward clutch (16).

Here, power is also transmitted to the sun gear 22 of the planetary gear unit 13 installed on the planetary gear shaft 14, but since the reverse brake 17 connecting the pinion 25 is unlocked, the pinion ( Since 25) rotates idling, power cannot be transmitted from the sun gear 22 to the ring gear 23.

Therefore, when the forward clutch 16 is locked, the power transmitted to the external driven gear 15 is directly transmitted to the final drive gear 18 to drive the final driven gear 21 meshed with the final driven gear 21. It is to be made. That is, the power transmitted from the transmission mechanism 2 is transferred to the final driven gear 21 as it is.

On the other hand, when the forward clutch 16 is unlocked and the reverse brake 17 is locked, since the power is not transmitted through the forward clutch 16, the final drive only by the power transmitted through the planetary gear unit 13. The gear 18 is driven.

Therefore, when the reverse brake 17 is locked, power is transmitted in the same manner as in the first embodiment, so that the reverse is made.

According to the third embodiment of the present invention, as shown in FIG. 3, the external driven gear 15 is connected to the sun gear 22 of the planetary gear unit 13 through the carrier 28, and the carrier 28 is connected to the carrier 28. A forward clutch 16 is installed between the pinion carriers 26, and the ring gear 23 of the planetary gear unit 13 is connected to the planetary gear shaft 14, while the final gear shaft 14 is final. The drive gear 18 is provided, and the rest of the structure is the same as in the first and second embodiments.

In the third embodiment of the present invention having such a structure, when the forward clutch 16 is locked, the shift is performed in the transmission mechanism 2 and is transmitted through the external drive gear 12 and the external driven gear 15. The power is input to the pinion 25 through the pinion carrier 26 while being input to the sun gear 22 of the planetary gear unit 13. Therefore, in the planetary gear unit 13, the sun gear 22 and the pinion 25 are rotated at the same speed, and are arranged around the pinion 25 to receive the driving force from the pinion 25 (ring gears) 23, the rotational power of the external driven gear 15 is transmitted as it is without shifting.

Then, as described above, the power transmitted to the ring gear 23 is transmitted to the output shaft 20 through the planetary gear shaft 14, the final driving gear 18 and the final driven gear 21, wherein the output shaft ( In the rotation direction of 20), the driving in the forward direction is made as in the first embodiment.

On the other hand, when the forward clutch 16 is unlocked and the reverse brake 17 is locked, as in the description of the first embodiment, no power is transmitted through the forward clutch 16 but only through the sun gear 22. In addition to the transmission of power, the planetary carrier 26 is locked by the reverse brake 17 so that the pinion 25 does not rotate but only rotates.

Therefore, the driving direction of the sun gear 22 and the driving direction of the ring gear 23 in the power transmission process between the drive gear sun gear 22, the power transmission medium pinion 25, and the driven gear ring gear 23 are Reverse operation is to be reversed. The power transmitted to the ring gear 23 is transmitted to the output shaft 20 through the planetary gear shaft 14 to be output.

In the fourth embodiment of the present invention, as shown in Fig. 4, the arrangement of the transmission mechanism 2 is different from the arrangement of the first to third embodiments, that is, the present invention. The fourth embodiment of the present invention is characterized in that the actuating mechanisms 9 and 10 for varying the operating diameters of the variable drive pulley 6 and the variable driven pulley 8 are arranged in opposite directions to those of the first to third embodiments. It consists of a structure.

Changing the positions of the operating structures 9 and 10 of the pulleys 6 and 8 in this way is necessary to make the assembly structure compact in the process of assembling the transmission, and the assembling positions of the operating structures 9 and 10 are changed. In this case, the length of the input shaft 5 and the intermediate shaft 11 can be shortened.

In the continuously variable transmission of each embodiment having the above-described structure, as shown in FIG. 5, the shift is made while the power generated by the engine 1 passes through the belt pulleys 6 and 8, wherein the pulley 6 , 8) as the operating diameters are mutually variable, the rotational speed of the power transmitted from the driving pulley 6 to the driven pulley 8 is continuously shifted.

Then, the power shifted from the variable driven pulley 8 is transmitted to the sun gear 22 of the planetary gear unit 13 through the external drive gear 12 and the external driven gear 15, and to the sun gear 22. When the forward clutch 16 is locked in a state in which power is transmitted, the rotation direction of the power transmitted to the output shaft 20 through the ring gear 23 of the planetary gear unit 13 is transmitted in the forward rotation.

Then, if the forward clutch 16 and the reverse brake 18 are not locked, idling occurs in the pinion 25 and the pinion carrier 26 of the planetary gear unit 13, so that the ring of the planetary gear unit 13 The power is not transmitted to the gear 23, and thus the power is not transmitted to the output shaft 20, so that it is in a neutral state.

On the other hand, when the reverse brake 17 is locked in a state where power is transmitted to the sun gear 22 of the planetary gear unit 13 as described above, the pinion carrier 26 is fixed, and thus the pinion 25 and Since power transmission is transmitted in the reverse direction between the ring gear 23, the direction of the power transmitted to the output shaft 20 is reversed.

Therefore, in the continuously variable transmission according to the present invention, the shift is made only between the variable drive pulley 6 and the variable driven pulley 8 constituting the shift mechanism 2, and the shift is not performed in the power switching mechanism 3. Only the direction of power transmission will be switched.

That is, the power transmission mechanism composed of the planetary gear unit 13, the forward clutch 16, and the reverse brake 18 controls the transmission direction of the power continuously shifted from the transmission mechanism 2.

As described above, the continuously variable transmission according to the present invention has a planetary gear unit 13 constituting the power switching mechanism 3 for controlling the power transmission direction, and an intermediate portion between the input shaft 5 and the belt pulleys 6 and 8. Since the structure is provided on the planetary gear shaft 14, which is the third shaft instead of the shaft 11, the overall structure of the transmission can be simplified, and clutches and brakes for controlling the operation of the planetary gear unit 13 are also provided. Since the space for installing the control elements such as this is expanded, there is an advantage that can be installed a variety of operation control elements.

Claims (3)

A variable drive pulley (6) installed on an input shaft (5) for transmitting power of the engine (1), the operation diameter of which is selectively variable, and a variable drive pulley (6) provided on the intermediate shaft (11); A transmission mechanism (2) configured to be connected via a belt (7) and having a variable driven pulley (8) whose operating diameter is selectively variable to shift the power transmitted from the engine (1); A power switching mechanism (3) installed in the planetary gear shaft (14) consisting of the planetary gear unit (13) and the forward clutch (16) and the reverse brake (17) for controlling the operation of the planetary gear unit (13) to form a third axis. ); External drive and driven gears (12, 15) for transmitting the power shifted from the transmission mechanism (2) to a power switching mechanism (3); And a longitudinal reducer (4) comprising a final drive gear (18) connected to the ring gear (23) of the planetary gear unit (13) and a final driven gear (21) engaged with the final drive gear (18). The sun gear 22 of the planetary gear unit 13 is fixed to the planetary gear shaft 14, and the ring gear 23 is connected to the final drive gear 18 through the carrier 24, and the forward clutch (17) is provided between the pinion carrier (26) supporting the pinion (25) of the planetary gear unit 13 and the planetary gear shaft (14), while the reverse brake (17) is the pinion carrier (26). Belt pulley continuously variable transmission, characterized in that the structure is installed between the transmission housing and the transmission (27). 2. The transmission clutch (16) according to claim 1, wherein a forward clutch (16) is provided between the planetary gear shaft (14), the carrier (24) connecting the ring gear (23) and the final drive gear (18). Belt pulley continuously variable transmission, characterized in that the reverse clutch (17) installed in the structure is connected to the pinion (25) of the planetary gear unit (13) through the pinion carrier (26). 3. The external driven gear (15) is connected to the sun gear (22) of the planetary gear unit (13) via a carrier (28), and the forward clutch between the carrier (28) and the pinion carrier (26). (16) is installed, the ring gear 23 of the planetary gear unit 13 is connected to the planetary gear shaft (14), while the final drive gear (18) is provided on the planetary gear shaft (14). Belt pulley continuously variable transmission characterized in that