JPS62113958A - Continuously variable transmission - Google Patents

Abstract

PURPOSE:To make it possible to get a wide range of change gear ratio, by widening a change gear ratio range generated by a V-belt type continuously variable transmission mechanism, through interposition a planet gear train. CONSTITUTION:A planet gear train 5 and a V-belt type continuously variable transmission mechanism 3 are interposed between an input shaft 4 and an output shaft 18. Then, a linking gear 17 which is linked to the output shaft 18, is engaged with a gear 21 which is connected to one of three elements of the plane gear train 5, and clutches 14, 23, which can fix the other two elements of the planet gear train 5, to each other, are installed. With this constitution, a wide range of change gear ratio can be obtained.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a continuously variable transmission, and particularly to a continuously variable transmission that is equipped with a V-belt type continuously variable transmission mechanism that is suitably used as an automatic transmission. This invention relates to a continuously variable transmission device that can be directly connected without any transmission.

(Conventional technology) Conventionally, belt type continuously variable transmission 8! has been used as a transmission device for automatic transmission vehicles. Continuously variable transmissions using grooves have been put into practical use. Further, when the drive section and the output shaft are directly connected without using a V-belt, a gear train and switching means are separately provided.

(Problems to be Solved by the Invention) However, when the 191-belt valor gear transmission mechanism is used alone, there is a problem in that it is difficult to obtain a large gear ratio range. In other words, the maximum gear ratio width that can be obtained is only about 4.6, and in order to obtain such a gear ratio width, a large pulley ratio width is required, and the stroke of the movable sheave becomes large. A large driving means for the movable sheep is required, which increases the size of the device, and also requires a gear train for direct coupling, resulting in high costs.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a continuously variable transmission that can obtain a large gear ratio range with a small pulley ratio width and does not require a separate direct gear train.

(Means for Solving the Problems) In order to achieve the above object, the continuously variable transmission according to the present invention includes a planetary gear train between the input shaft and the output shaft.■ Belt type continuously variable transmission 8! In addition to interposing the mechanism, the interlocking gear that interlocks with the output shaft is shown in the figure 3! ! A clutch is provided that meshes with a gear connected to one of the three elements of the planetary gear train and can mutually fix two of the three elements of the planetary gear train, and the V-belt type continuously variable transmission P11 ! ! This is characterized in that a clutch is interposed between the output side sheep of II and the interlocking gear.

(Function) In this way, the planetary tooth Jμ array is arranged between the input shaft and the V-belt type continuously variable transmission mechanism, and the interlocking gear interlocked with the output shaft is set as one of the three elements of the planetary gear train. Since it meshes with the connected gears, the gear ratio of the planetary gear train changes according to the output transmission changed by the V-belt type continuously variable transmission mechanism, and its rotation becomes the input rotation of the V-belt type continuously variable transmission mechanism. The gear ratio width of the V-belt type continuously variable transmission mechanism is expanded by the interposition of the planetary gear train, and a large gear ratio width is output to the output shaft. In addition, by engaging the clutch provided on the planetary gear train and releasing the clutch between the output sheave and the interlocking gear, the input shaft and output shaft can be directly connected using the interlocking gear and the gear that meshes with it. It is possible.

(Example) Hereinafter, an example in which the present invention is applied to a continuously variable transmission for an automobile will be described based on the drawings. 1 and 2, 1 is an engine whose rotation is transmitted to an input shaft 4 of a continuously variable transmission 3 via a fluid coupling 2, and the input shaft 4 is connected to a sun gear 6 of a planetary gear train 5. ing. This sun gear 6
The carrier 8 supporting the planetary gear 7 meshed with is connected to the input end sheave 11 of the belt transmission gear 411t10. The output side sheep 12 of the V-belt type continuously variable transmission mechanism 10 is connected to one end of the rotation 1dl 13,
The other end is connected to the clutch 14, and further interlocked to the output shaft 18 of the continuously variable transmission 3 via a forward/reverse switching mechanism 15, a transmission gear 16, and an interlocking gear 17 meshing therewith. This output shaft 18 is operatively connected to a differential gear device 20 via an output tooth IL19.

On the other hand, the ring gear 9 of the planetary gear train 5 has the interlocking teeth 1
A tooth I'1t21 meshing with 117 is connected.

Further, a clutch 22 that can be fixed to the carrier 8 is disposed on the outer circumference of the ring gear 9.

Next, the operation of the above configuration will be specifically explained.

Now, the number of teeth in the planetary gear train 5 is 36 for the sun gear 6,
Planetary gear 7 is 23, ring gear 9 is 84, and V
The boolean ratio width of the belt type continuously variable transmission mechanism is 0.7 to 1.5, the number of teeth of the transmission gear 16 is 38, the number of teeth of the interlocking tooth 1t17 is 61, and the teeth of the gear 21 connected to the ring gear 9. number 5
Set it to 4.

Here, the rotation speed of each part in the planetary gear train 5 is the rotation speed of the sun gear when the carrier 8 makes one rotation, that is, the rotation speed of the i star tooth 1.
1 [If the reduction ratio of column 5 is determined as X, it will be as follows.

Sun gear Ring gear Carrier all fixed 1 1 First, find X when the pulley ratio is 0.7.

Since the rotation speed of the carrier is 1, the rotation speed of the ring gear is 3810.7. X54=1.005, and when calculating X with the rotation speed of the ring gear in the table above as 1.005,
=0.988.

Also, when the boolean ratio is 1.5, the rotation speed of the ring gear is 38/1.5X54=0.469, and X=2,23
It becomes 9.

Since the reduction ratio of the planetary gear train 5 and the belt type transmission mechanism 10 is given by the product of the reduction ratios of both, the reduction ratio width is 0.6.
92 (0,988X0.7) ~ 3°359 (2,
239X1.5), and the ratio of the maximum value to the minimum value is 4
．． It becomes 856. Note that the open reduction ratio of the input shaft t and the output shaft 18 is obtained by multiplying the above reduction ratio by the tooth number ratio of 61/38 of the interlocking gear 17 and the transmission gear 16, and the ratio width is 1.11. ~5.39.

That is, if the planetary gear train 5 is arranged in parallel and the number of teeth thereof is set as described above, a V-belt with a pulley ratio width of 0.7 to 1°5 (the ratio of the maximum value to the minimum value is 2,143) is obtained. Using the formula continuously variable transmission mechanism 10, the reduction ratio width is set to 1.11 to 5.39 (
The ratio of the maximum value to the minimum value can be increased to 4.856).

Further, the relationship between the boolean ratio and the reduction ratio exhibits characteristics as shown in FIG.

By the way, during the deceleration operation described above, the clutch 22 is released so that the carrier 8 and the ring gear 9 can rotate relative to each other, and the clutch 14 is fixed so that the rotation of the output sheave 12 is transmitted to the output shaft 18.

On the other hand, when the clutch 22 is fixed, the entire planetary gear train 5 is fixed integrally, and the entire planetary gear train 5 rotates at the same speed as the input shaft 4, and the gear 21 connected to the ring gear 9 and the interlocking gear 1
The output shaft 18 is directly connected through the meshing of 7. At that time, the clutch 14 is released! The rotation of the V-belt type transmission gear M/110 and the rotating shaft 13 due to the rotation of the M gear train 5 is made two rotations.

It should be noted that the present invention is not limited to the above embodiment, and for example, the gear 21 is connected to the carrier 8, and the ring gear 9 is connected to
It may also be connected to the belt type transmission mechanism 10. In this case, the gear 21 will be transmitted in the opposite direction to the input shaft 4.

Further, in the above embodiment, the clutch 22 which can be fixed to the carrier 8 and the carrier 8 is disposed on the outer circumference of the ring gear 9, but as shown in FIG. It goes without saying that even if the clutch 23 is disposed around the outer periphery of the input shaft 4 and the input shaft 4 and the ring gear 9 are connected to this, the same effect will be obtained.

(Effects of the Invention) According to the continuously variable transmission of the present invention, as described above, the planetary gear train is disposed between the input shaft and the V-belt type continuously variable transmission mechanism, and the interlocking gear interlocked with the output shaft is Said 3! ! Since it meshes with the gear connected to one of the three elements of the star gear train, V
The gear ratio of the planetary gear train changes according to the output rotation changed by the belt-type continuously variable transmission mechanism, and that rotation becomes the input rotation of the V-belt type continuously variable transmission mechanism. The width has been expanded by intervening a planetary gear train, and ■ Belt type continuously variable speed 8! Even if the pulley ratio width of the mechanism is made small, a large gear ratio range can be achieved.Also, by engaging the clutch provided on the 111th row of planetary teeth and releasing the clutch between the output sheave and the interlocking gear, the interlocking gear By using the gear that meshes with the input shaft and the output shaft, it is possible to switch the input shaft and the output shaft to a direct connection state via the gear. Therefore, it is possible to obtain the necessary reduction ratio range using a compact V-belt type continuously variable transmission mechanism, and it is also possible to switch to direct coupling without installing a separate direct-coupled gear train, creating a compact continuously variable transmission that can be directly coupled. It can be obtained cheaply.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an embodiment of the present invention, Fig. 2 is a schematic side view showing the meshing relationship of each gear, Fig. 3 is a schematic diagram of another embodiment, and Fig. 4 is a diagram showing the pulley ratio. It is a characteristic diagram of a reduction ratio.

Claims (1)

[Claims] (1) A planetary gear train and a V-belt type continuously variable transmission mechanism are interposed between the input shaft and the output shaft, and the interlocking gear that interlocks with the output shaft is one of the three elements of the planetary gear train. meshing with the connected gears, and two of the three elements of the planetary gear train
A continuously variable transmission device, characterized in that a clutch capable of fixing elements to each other is provided, and the clutch is interposed between the output side sheave of the V-belt type continuously variable transmission mechanism and the interlocking gear.