JP3422503B2 - Continuously variable transmission - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuously variable transmission using a friction wheel type continuously variable transmission mechanism. 2. Description of the Related Art A conventional continuously variable transmission is disclosed in
There is one disclosed in Japanese Patent No. 255654. The continuously variable transmission shown in these figures has a first transmission which is coaxial with the engine output shaft.
The shaft has an electromagnetic clutch as a starting mechanism, an idler gear selection type forward / reverse switching mechanism, and a friction wheel type transmission mechanism on a second shaft parallel to the first shaft. [0003] However, in the above-described conventional continuously variable transmission, the second shaft on which the friction wheel type continuously variable transmission mechanism is arranged is provided on the first shaft. The inner diameter of the continuously variable transmission is large because the shaft length of the second shaft is long and the overall length of the continuously variable transmission is large in order to avoid interference with the starting mechanism of the bearing portion of the second shaft. There is a problem that becomes. An idler gear for adjusting the rotation direction is provided on the third shaft, and an idler shaft for supporting the idler gear for meshing with the gear of the second shaft is also long. According to the present invention, a second shaft, on which a friction wheel type continuously variable transmission mechanism is disposed, is positioned outside an outer diameter of a starting mechanism provided on a first shaft. By placing
This is to solve the above-mentioned problem. That is, in the continuously variable transmission according to the present invention, the starting mechanism and the forward / reverse switching mechanism are provided on a first shaft that is coaxial with the engine output shaft, and a friction wheel type continuously variable transmission is provided on a second shaft that is parallel to the first shaft. A transmission mechanism is provided
In the continuously variable transmission, the second shaft is disposed on the outer peripheral side of the outer diameter of the starting mechanism of the first shaft, and the gear of the output part of the forward / reverse switching mechanism of the first shaft and the friction of the second shaft The gear of the input portion of the vehicle-type continuously variable transmission mechanism is connected via an idler gear provided on a third axis parallel to the first axis and the second axis.
Features . The starting mechanism is a torque converter,
It is a device such as a centrifugal clutch, a hydraulic clutch, etc., which facilitates transmission of torque from the engine, especially when starting. The rotational force of the engine is transmitted in the order of the starting mechanism, the forward / reverse switching mechanism, and the friction wheel type continuously variable transmission mechanism. The friction wheel type continuously variable transmission mechanism is disposed on a second shaft different from the engine output shaft, and only the starting mechanism and the forward / reverse switching mechanism are disposed coaxially with the engine output shaft. Since the second shaft provided with the friction wheel type continuously variable transmission mechanism is disposed on the outer peripheral side of the outer diameter of the starting mechanism, the friction wheel type continuously variable transmission mechanism may be disposed closer to the engine side. As a result, the overall length of the continuously variable transmission can be reduced. An idler gear provided on a third shaft parallel to the first shaft, the output shaft gear of the first shaft forward / reverse switching mechanism, and the input gear of the friction wheel type continuously variable transmission mechanism of the second shaft. By connecting via
Each gear can be made smaller and the rotation direction can be satisfied. 1 and 2 show an embodiment of the present invention. The continuously variable transmission includes a first shaft 12 coaxial with the engine output shaft 10.
It has a torque converter 14 (starting mechanism) and a forward / reverse switching mechanism 16 arranged above. Engine output shaft 10
An idler gear 20 (see FIG. 2) is provided on a third shaft 18 which is parallel to. Note that the idler gear 20 is not shown in FIG. 1 due to a sectional position. Similarly, a friction wheel type continuously variable transmission mechanism 24 is disposed on a second shaft 22 parallel to the engine output shaft 10. A differential mechanism 28 is provided on a fourth shaft 26 parallel to the engine output shaft 10. The torque converter 14 to which the torque is input from the engine outputs the torque to the rotating shaft 30. Rotary axis 3
Numeral 0 is connected to the drum 34 of the forward clutch 32 of the forward / reverse switching mechanism 16 and the sun gear 38 of the double pinion type planetary gear device 36 so as to always rotate integrally.
The forward clutch 32 can connect or disconnect the clutch drum 34 and the carrier 40 of the planetary gear device 36. The carrier 40 is connected so as to always rotate integrally with the rotating shaft 42. The internal gear 43 of the planetary gear device 36 can be connected to or disconnected from a casing 46 by a reverse brake 44. The carrier 40 has two sets of pinion gears that mesh with each other. One set of pinion gears always meshes with the sun gear 38, and the other set of pinion gears is the internal gear 4.
Always meshed with 1. The rotary shaft 42 is provided with a gear 46 integrally therewith. The gear 46 is connected to the third shaft 18.
The idler gear 20 meshes with a gear 48 on the second shaft 22.
The gear 48 is connected so as to always rotate integrally with the cam plate 50 of the friction wheel type continuously variable transmission mechanism 24. The cam plate 50 is capable of transmitting the rotational force to the input disk 54.
2, an axial force corresponding to the input torque can be applied. An output disk 56 is provided to oppose the input disk 54, and both form a toroidal groove. The friction roller 5 is inserted into the toroidal groove.
8 are provided. Input disk 5 of friction roller 58
The state of contact with the output disk 4 and the output disk 56 is made variable by a shift control mechanism (not shown). Input disk 5
4 and the output disk 56 are rotatably supported by a rotating shaft 60. A disc spring 62 and a loading nut 64 are provided on the right end side of the rotating shaft 60 in the drawing, thereby giving an initial vertical force between the input disk 54 and the output disk 56. A gear 66 that rotates integrally with the output disk 56 is provided adjacent to the output disk 56 and meshes with a final drive gear 68 of the differential 28. Note that the positional relationship among the first shaft 12, the second shaft 22, the third shaft 18, and the fourth shaft 26 is arranged as shown in FIG. Next, the operation of this embodiment will be described. The rotation from the engine is transmitted to the torque converter 14, and the rotation from the engine is transmitted to the torque converter 14 via the rotation shaft 30.
Is transmitted to During forward movement, the forward clutch 32 is engaged, and the reverse brake 44 is released. Therefore, the sun gear 38 and the carrier 40 are connected to each other, and the planetary gear unit 36 integrally rotates in the same direction as the engine rotation direction. On the other hand, in reverse, the forward clutch 32 is released and the reverse brake 44 is engaged. As a result, the internal gear 41 is fixed, and rotation is input to the sun gear 38, so that the carrier 40 rotates in the reverse direction. Therefore, rotation in the direction opposite to the rotation direction of the engine is transmitted to the rotation shaft 42. The rotation of the rotation shaft 42 is transmitted to the friction wheel type continuously variable transmission mechanism 24 via the gear 46, the idler gear 20, and the gear 48. In the friction wheel type continuously variable transmission mechanism 24, a predetermined shift is performed according to the tilt angle of the friction roller 58, and the rotation is transmitted to the gear 66. Next, the rotation is transmitted from the gear 66 to the final drive gear 68 of the differential device 28 , and the wheels are driven via the drive shaft. As described above, since the friction wheel type continuously variable transmission mechanism 24 is disposed on the second shaft 22, only the torque converter 14 and the forward / reverse switching mechanism 16 need be disposed on the first shaft 12. Therefore, the first
The number of members arranged on the shaft 12 is reduced, and the dimension of the continuously variable transmission in the direction of the first shaft 12 is reduced. The second shaft 22 is
It is arranged so as to be located on the outer peripheral side of the outer diameter portion of the torque converter 14, so that a space for disposing the friction wheel type continuously variable transmission mechanism 24 between the first shaft 12 and the second shaft 22. Is secured. The provision of the idler gear 20 increases the distance between the first shaft 12 and the second shaft 22,
This is to prevent the gears 46 and 48 from becoming large, and to adjust the rotation direction of the final drive gear 68 to a normal stepped automatic transmission or the like (the output disk 56 rotates in reverse with respect to the input disk 54). In order to reverse the direction of rotation in advance). As described above, according to the present invention, the starting mechanism and the forward / reverse switching mechanism are arranged on the first shaft coaxial with the engine output shaft, and are located outside the outer diameter of the starting mechanism. Since the second shaft is disposed on the second shaft and the friction wheel type continuously variable transmission mechanism is provided on the second shaft, the overall length of the continuously variable transmission can be reduced. By connecting the gear of the output portion of the forward / reverse switching mechanism of the first shaft and the gear of the input portion of the friction wheel type continuously variable transmission mechanism of the second shaft via an idler gear provided on the third shaft. , Each gear can be made smaller and the direction of rotation can be set as desired.

[Brief description of the drawings] FIG. 1 is a diagram showing an embodiment of the present invention. FIG. 2 is a diagram showing a shaft arrangement of the embodiment of FIG. 1; [Explanation of symbols] 10 Engine output shaft 12 First axis 14. Torque converter (starting mechanism) 16 Forward / backward switching mechanism 18 3rd axis 22 Second axis 24 Friction wheel type continuously variable transmission 28 Differential mechanism

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H 37/02 F16H 15/38

Claims (1)

(1) A starting mechanism and a forward / reverse switching mechanism are provided on a first shaft that is coaxial with an engine output shaft, and a friction wheel is provided on a second shaft that is parallel to the first shaft. In a continuously variable transmission provided with a stepless continuously variable transmission mechanism, the second shaft is disposed on the outer peripheral side of the outer diameter of the starting mechanism of the first shaft, and the output of the forward / reverse switching mechanism of the first shaft is provided. Part gear
And a gear at an input portion of the second shaft friction wheel type continuously variable transmission mechanism.
Is an eye provided on a third axis parallel to the first axis and the second axis.
A continuously variable transmission which is connected via a gear.