JPS60249757A - Continuously variable transmission gear - Google Patents

Abstract

PURPOSE:To make the construction of continuously variable transmission gear compact by mounting a driving pulley on a primary axis, a driven pulley and a planetary gear type forward rear changing mechanism on a seconary axis, and a final speed reduction mechanism, a differential mechanism, a chain mechanism and a gear mechanism on a third axis. CONSTITUTION:A driving pulley 16, a driven pulley 26 and a planetary gear type forward and rear change mechanism 36 are disposed on a driving shaft 14 which is connected to the output shaft 12 of an engine 10. A final speed reduction mechanism 62, a differential mechanism 64 and a chain belt 58 are mounted in the adjacent position of a sprocket 60. The axial lengths of said members which are arranged on respective axes may be approximately equal to each other, whereby making the construction of the transmission compact.

Description

[Detailed description of the invention] (b) Industrial application fields The present invention relates to a continuously variable transmission.

(B) Prior Art A conventional continuously variable transmission is disclosed in Japanese Patent Application Laid-open No. 129953/1983. This continuously variable transmission has three axes, with a fluid coupling, a planetary gear type forward/reverse switching mechanism, and a drive pulley arranged on the first axis, which is concentric with the engine output shaft, and a drive pulley on the second axis. A driven booby and a final reduction mechanism are arranged on the third axis, and a differential mechanism is arranged on the third axis.

The final reduction mechanism on the second axis and the differential on the third axis are connected by a chain mechanism.

(c) Problems that the invention attempts to solve However, with conventional continuously variable transmissions like the one above.

The fluid coupling, the planetary gear type forward/reverse switching mechanism, and the drive pulley are arranged on the first axis, and the main components are concentrated on the first axis. The axial dimensions of the parts are larger, and the engine is mounted horizontally.
There was a problem in that there were major restrictions when installing it on F cars. It is an object of the present invention to solve the above-mentioned problems and to obtain a continuously variable transmission in which each component is evenly arranged on each shaft and whose axial dimension is short.

(D) Means for Solving the Problems The present invention achieves the above object by arranging each component equally on three axes. That is, in the continuously variable transmission according to the present invention, the driving pulley is arranged on the first axis concentric with the engine output shaft, and the driven pulley and the planetary gear type forward/reverse switching mechanism are arranged on the second axis parallel to the first axis. A final reduction mechanism and a differential mechanism are arranged on a third axis that is parallel to the first and second axes, and the rotating shaft on the second axis and the rotating shaft on the third axis are connected so that rotational force can be transmitted. A chain mechanism or gear mechanism is provided.

(e) Effects With the above configuration, the axial dimensions of the members arranged on the three axes are approximately equal, and the axial dimension of the continuously variable transmission as a whole can be reduced. By doing so, the mounting performance on the vehicle is improved.

(F) Embodiments Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 3 of the accompanying drawings.

(First Embodiment) FIG. 1 shows a first embodiment of the present invention. A drive shaft 14 is connected to the output shaft 12 of the engine 10.
4 is provided with a drive pulley 16. Drive pulley 1
Reference numeral 6 denotes a fixed conical plate 18 fixed to the drive shaft 14, which is disposed opposite to the fixed conical plate 18 to form a V-shaped pulley groove, and is configured to move in the axial direction of the drive shaft 14 by the hydraulic pressure acting on the drive pulley cylinder chamber 20. It consists of a movable conical plate 22 that is movable. The driving pulley 16 is coupled to a driven pulley 26 by a V-belt 24 in a transmission manner. The driven pulley 26 includes a fixed conical plate 30 fixed to a hollow driven shaft 28, and a V-shaped pulley groove formed by opposing the fixed conical plate 30. 28 and a movable conical plate 34 that is movable in the axial direction. A planetary gear type forward/reverse switching mechanism 36 is arranged adjacent to the driven pulley 26 . Planetary gear type forward/backward switching mechanism 36
has a planetary gear set 38, a forward clutch 40, and a reverse brake 42. The planetary gear set 38 includes a sun gear 44, an internal gear 46, and a pinion carrier 52 having two pinion gears 48 and 50.
have. Pinion gear 48 and pinion gear 50 mesh with each other, pinion gear 5o also meshes with internal gear 46, and pinion gear 4
8 is also engaged with sun gear 44. The sun gear 44 is always connected to the driven shaft 28, the pinion carrier 52 can be connected to and disconnected from the driven shaft 28 by the forward clutch 40, and the internal gear 46 is connected to the stationary part by the reverse brake 42. It can be fixed as necessary. pinion carrier 5
2 is connected to one end of a shaft 54 that passes through the hollow part of the driven shaft 28, and the other end of this shaft 54 is connected to a sprocket 56.
is provided. Sprocket 56 is transmission connected to another sprocket 60 by a chain belt 58. A final reduction mechanism 62 adjacent to the sprocket 60
and a differential mechanism 64 are arranged. The final reduction mechanism 62 is a planetary gear type consisting of a sun gear 66, an internal gear 68, and a pinion carrier 72 that supports a pinion gear 70.
7) M744:: is connected to A . The differential mechanism 64 has an output shaft 76 that passes through the hollow portion of the shaft 74 and an output shaft 78 that extends in the opposite direction. Output shaft 76 and output shaft 78
are provided with joints 80 and 82, respectively, and these joints 80 and 82 are connected to the wheels via shafts, joints, etc. (not shown).

Next, the operation of this embodiment will be explained. engine 10
The rotational force input from the output shaft 12 of the drive shaft 14, drive pulley 16, V belt 24, driven pulley 26, driven shaft 2
8, and when the forward clutch 40 is engaged and the reverse brake 42 is released, the sprocket 56 is driven via the pinion carrier 52 and the shaft 54, and the rotational force of the sprocket 56 is further transmitted. is transmitted via the chain belt 58, sprocket 60, final reduction mechanism 62, and differential mechanism 64, and the output shaft 76 and output shaft 78 are rotated in the forward direction. Conversely, reverse brake 4
2 is engaged and the forward clutch 40 is released, the pinion carrier 52 rotates in the opposite direction to the sun gear 44 due to the action of the planetary gear set 38. Therefore,
The output shaft 76 and the output shaft 78 are rotated in the reverse direction by the same transmission path as in the above case. Further, when both the forward clutch 40 and the reverse brake 42 are released, the transmission of rotational force between the driven shaft 28 and the shaft 54 is cut off, resulting in a neutral state. When transmitting power as described above, by moving the movable conical plate 22 of the drive pulley 16 and the movable conical plate 34 of the driven pulley 26 in the axial direction to change the radius of the contact position with the V-belt 24, the drive pulley 16 The rotation ratio between the driven pulley 26 and the driven pulley 26 can be changed. For example, if the width of the V-shaped pulley groove of the driving pulley 16 is expanded and the width of the V-shaped pulley groove of the driven pulley 26 is reduced, the radius of the V-belt contact position on the driving pulley 16 side becomes smaller, and the driven pulley 26 The radius of the contact position of the V-belt on the side becomes larger, and a larger reduction ratio can be obtained as a result. If the movable conical plate 22 and the movable conical plate 34 are moved in the opposite direction to the above, the reduction ratio becomes smaller. In addition,
When starting forward movement from a neutral state, smooth start can be achieved by gradually engaging forward clutch 40 as the rotational speed of engine 10 increases. Furthermore, when starting in the reverse direction, the reverse brake 42 may be gradually engaged. That is, in the case of this embodiment, the forward clutch 40 and the reverse brake 42 are elements for switching between forward and reverse directions, and also have a function as a starting device. Therefore, since there is no need to separately provide a starting device such as a fluid coupling, the continuously variable transmission is extremely compact. Moreover, in this case, since the forward clutch 40 and the reverse brake 42 are arranged on the output side of the driven pulley 26 (that is, the rotation after deceleration is input), the relative rotation difference at the time of starting is small, and the durability is improved. It is advantageous.

As described above, in this continuously variable transmission, the drive pulley 16 is arranged on the first axis, which is the axis center line of the output shaft 12 and the drive shaft 14 of the engine 10, and the axis center line of the driven shaft 28 and the shaft 54. The driven pulley 26 and the planetary gear type forward/reverse switching mechanism 36 are arranged on the second axis, and the shaft 74 and the output shaft 76
A final reduction mechanism 62 and a differential mechanism 64 are arranged on the third axis, which is the axis center line of the output shaft 78.
and a chain belt 58),
The axial dimensions of the members arranged on each axis are approximately equal, and the axial dimension of the continuously variable transmission as a whole is extremely small. Therefore, it becomes possible to mount the continuously variable transmission on a horizontally mounted front-wheel drive vehicle with a small vehicle width. In addition, in this embodiment, the planetary gear type forward/reverse switching mechanism 36 is placed on the opposite side of the engine 10 across the driven pulley 26, but this is done without considering interference with the engine 10 and the forward clutch This is advantageous in that the diameters of the brake 40 and the reverse brake 42 can be increased.

(Second Embodiment) FIG. 2 shows a second embodiment of the present invention. This second embodiment transmits the rotational force between the shafts 54 and 74 by gears instead of the chain mechanism (sprocket 56, tin rocket 60, and chain belt 58) of the first embodiment shown in FIG. It was established as a mechanism. That is, a gear 84 is provided on the shaft 54, and a gear 86 that meshes with the gear 84 is provided on the shaft 74.
is provided. Other configurations are as shown in Figure 1.
It is similar to the embodiment (the same members as in FIG. 1 are given the same reference numerals). It is clear that this $2 embodiment also provides the same functions and effects as those of the first embodiment described above.

(Third Embodiment) FIG. 3 shows a third embodiment of the present invention. This third embodiment is different from the first embodiment shown in FIG. 1 by adding a fluid coupling 90, which is a starting device. That is, drive shaft 1
4 is hollow, and the hollow part is the output shaft 12 of the engine 10.
The pump impeller 92 side of the fluid coupling 90 is connected to the output shaft 12 through the turbine launch 9 of the fluid coupling 90.
The fourth side is connected to the drive shaft 14. The fluid coupling 90 includes a lockup clutch 96 that can mechanically connect the pump impeller 92 and the turbine runner 94. The rest of the structure is the same as the first embodiment shown in FIG. In this third embodiment, in addition to the functions and effects of the first embodiment described above, a fluid coupling 90 is provided as a starting device.

Starting can be performed more smoothly compared to the first embodiment. Note that, in addition to the fluid coupling 90, a torque converter, a hydraulic clutch, an electromagnetic clutch, etc. can be used as the starting device. Also in this third embodiment, it is clear that the chain mechanism disposed between the second axis and the third axis can be a gear mechanism.

(g) As described in detail, the continuously variable transmission according to the present invention has the following features:
A drive booby is arranged on a first axis concentric with the engine output shaft, a driven pulley and a planetary gear type forward/reverse switching mechanism are arranged on a second axis parallel to the first axis, and parallel to the first and second axes. A final reduction mechanism and a differential mechanism are disposed on the third axis, and a chain mechanism or a gear mechanism is provided to connect the rotating shaft on the second axis and the rotating shaft on the third axis so that rotational force can be transmitted. As a result, the axial dimensions of the members disposed on each axis are approximately equal, the axial dimension of the continuously variable transmission as a whole can be reduced, and the mounting performance on a vehicle is improved.

[Brief explanation of drawings]

FIG. 1 shows a first embodiment of the invention, FIG. 2 shows a second embodiment of the invention, and FIG. 3 shows a third embodiment of the invention. 10...Engine, 12.Life/Output! , 14... Drive shaft, 16... Drive pulley, 18--ψ fixed conical plate, 20Φ # fist drive pulley cylinder chamber, 22... Movable conical plate, 24...-V belt, 26... Hibiki driven pulley,
28 - Driven shaft, 30... Fixed conical plate, 32...
- Driven pulley cylinder chamber, 34 - Movable conical plate, 3
6.--Planetary gear type forward/backward switching mechanism, 38.. Planetary gear set, 40. e forward clutch, 42-. fist reverse brake, 44. Φ. sun gear, 46. φ fist internal gear, 48. ...Pinion gear, 50@...Pinion gear, 52・War・Pinion carrier, 54...Shaft, 56
I111・Sprocket, 58φφ・Chain belt,
60--- Sprocket, 62... Final reduction mechanism, 64
・Fist/differential mechanism, 66... Sun gear, 68... Internal gear, 70... Pinion gear, 72... Pinion carrier, 74... Shaft, 76... Output shaft, 7
8...Output shaft, 80...Joint, 82...e joint. Patent Applicant Nissan Motor Co., Ltd. Agent Patent Attorney Toshiyuki Miyauchi Figure 1 Figure 2

Claims (1)

[Claims] 1. In a continuously variable transmission having a drive pulley, a driven pulley, and a belt wrapped around both, the drive pulley is arranged on a first axis concentric with the engine output shaft, and parallel to the first axis. A driven pulley and a planetary gear type forward/reverse switching mechanism are arranged on the second axis, and a final reduction mechanism and a differential mechanism are arranged on the third axis parallel to the first and second axes. A continuously variable transmission characterized by being provided with a chain mechanism or a gear mechanism that connects the shaft and a rotating shaft on a third axis so that rotational force can be transmitted. 2. The continuously variable transmission according to claim 1, wherein the forward/reverse switching mechanism on the second axis is disposed on the opposite side of the engine across the driven boob. 3. The continuously variable transmission according to claim 1 or 2, wherein a starting device that can control the transmission state between the engine output shaft and the drive pulley is provided on the first axis. 4. The continuously variable transmission according to claim 3, wherein the starting device is disposed on the opposite side of the engine across the drive pulley.