JPS62258260A - Continuously variable transmission - Google Patents

Abstract

PURPOSE:To provide the back and overdrive functions by coupling a first planetary gear mechanism in series with a belt type continuously variable transmission together with a second planetary gear mechanism while coupling the continuously variable transmission and a sun gear of the first planetary gear mechanism directly to the engine output shaft through a clutch. CONSTITUTION:The output shaft 1 of engine is coupled to a belt type continuously variable transmission 2 the output from which is transmitted through a clutch C2 to a first planetary gear mechanism 3 and the rotary shaft of a sun gear 9 in said mechanism 3 is coupled through a clutch C1 to the engine output shaft 1. The output shaft 15 of said planetary gear 13 is coupled respectively to a planetary gear carrier 23 and a sun gear 18 of a secondary planetary gear mechanism through clutches C3, C4. Furthermore, brakes B1, B2, B3 are provided respectively for a ring gear 11 of the first mechanism 3, the sun gear 18 of the second mechanism 4 and a carrier 23 of a planetary carrier 23. When combining these clutches and brakes variously, low speed, speed change, high speed, overdrive and back functions can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a continuously variable transmission, more particularly to a belt I
The present invention relates to a continuously variable transmission that is constructed by combining a tK dynamic continuously variable transmission mechanism and a planetary gear mechanism and is attached to a drive shaft system of an automobile.

Previous device and its problems Japanese patent application No. 61-30099 describes a planetary gear mechanism with a sun gear directly connected to the output shaft of the engine, and one continuously variable transmission connected to the output shaft of the engine via a set of spur gears. A continuously variable transmission device is shown which is constructed by combining a small belt power type continuously variable transmission Ps structure to which the rotating shaft of a pulley is connected.

The continuously variable transmission device of the above-mentioned application increases the output concentrated on the output shaft by a small amount of speed change carried out by the continuously variable transmission which bears a part of the output of the engine and transmits it to the output shaft. This has the effect of being able to perform a wide range of speed changes such as speed, deceleration, forward rotation, reverse rotation, and stop. However, the device of this invention does not have a mechanism for overdriving the output shaft.

The object of the present invention is to not only enable it to be used without reducing durability even when installed in a large engine, but also to
An object of the present invention is to provide a continuously variable transmission device incorporating a belt-electric continuously variable transmission mechanism that also has an overdrive function.

The above object of the present invention is to provide a pair of continuously variable gears, one of which is connected to the output shaft of an engine via a spur gear, and the rotating shaft of the other continuously variable gear is used as the output shaft. A belt-driven continuously variable transmission mechanism and a sun gear are directly connected to the output shaft of the engine, a boss portion of the ring gear is connected to the output shaft of the continuously variable transmission mechanism via a spur gear, and a carrier of the planetary gear is connected. Consisting of a first planetary gear mechanism with an output shaft attached thereto, and a second planetary gear mechanism with a sun gear connected to the output shaft of the first planetary gear mechanism and the output shaft attached on the centerline of the ring gear, The first planetary gear mechanism brakes the ring gear, the rotation axis of the sun gear and the ring gear.
a first clutch inserted between the boss portion of the gear, and a spur gear on the boss portion that meshes with the spur gear on the output shaft of the continuously variable transmission and the boss portion of the ring gear; A second brake that brakes the sun gear by the second planetary gear mechanism, a third brake that brakes the carrier of the planet gear, and a space between the boss portion of the sun gear and the center axis of the carrier of the planet gear. the third clutch inserted into the
This is achieved by the continuously variable transmission of the present invention, which is characterized in that it includes a fourth clutch inserted into the boss portion of the sun gear between the second brake and the third clutch.

Structure of the Invention The structure of the device of the present invention will be described with reference to an embodiment shown in the attached drawings. A belt-driven continuously variable transmission mechanism 2 connected via gears 7a and 7b, and a ring gear 11 connected to spur gears 17a and 17.
a first planetary gear mechanism 3 connected to the output shaft 6S of the continuously variable transmission mechanism 2 via b, and a second planetary gear mechanism 4 whose sun gear 18 is directly connected to the output shaft 15 of the first planetary gear mechanism 3. A continuously variable transmission mechanism 10 of the present invention is shown. 1st
The planetary gear mechanism 3 is not only connected in series with the second planetary gear mechanism 4 to the belt-driven continuously variable transmission mechanism 2, but also has a sun gear 9 directly connected to the output shaft 1 of the engine.

The belt ground motion continuously variable transmission mechanism 2 includes a pair of continuously variable transmission pulleys 5.6 that are rotatably supported and separated at a predetermined interval;
The continuously variable speed pulley 5 connects the rotating shaft 5S to the output shaft l of the engine via spur gears 7a and 7b, and the continuously variable speed pulley 6 connects the rotating shaft 5S to the output shaft 1 of the engine via spur gears 7a and 7b. The shaft 6S is used as an output shaft.

The first planetary gear mechanism is a planetary gear for speed change.

Boss portion 16'z of ring gear 11, pair of spur gears 17
a and 17b, the belt-driven continuously variable transmission mechanism 2
The rotation shaft 12 of the sun gear 9 is connected to the output shaft 1 of the engine/engine as described above, and the planetary gear 13
An output shaft 15 coaxial with the output shaft l of the engine is mounted on the carrier 14 of the engine. The first planetary gear mechanism 3 is a ring
A first brake Bl is provided at a position facing the outer periphery of the gear 11.

Furthermore, a first clutch CI is inserted between the end of the boss portion 16 of the ring gear 11 and the rotating shaft 12 of the sun gear 9, and the boss portion 16 and the spur gear 17b attached thereto.
The second planetary gear mechanism 4 is a planetary gear for reverse and overdrive, and the boss portion 19 of the sun gear 18 is connected to the first planetary gear mechanism. 3, and connect it to the output shaft 15 of ring gear 2.
An output shaft 22 coaxial with the output shaft 15 of the first planetary mechanism 3 is provided on the center line of 0. The second planetary gear mechanism 4 includes a second brake B2 at a position facing the large-diameter surface 19E of the boss portion 19 of the sun gear 18, and
and the rotating shaft 24 of the carrier 23 of the planetary gear 21, and a fourth clutch C4 inserted into the boss portion 19 between the second brake B2 and the third clutch C3. A third brake B3 is provided at a position facing the outer periphery of the carrier 23 of the planetary gear 21.
It is equipped with

A computer (not shown) is provided to control the timing and position of the four clutches C3 and C4 and the three brakes Bl, B2 and B3, ensuring smooth and quiet gear shifting. It is designed so that

The operation of the device of the present invention at each speed is achieved by using a combination of predetermined clutches and brakes selected from the four clutches and three brakes described above. The combinations of clutches and brakes used at each stage, such as low speed change, high speed, reverse, and overdrive, are as follows.

(1) Activate low speed Bl, 03.04 (2) Activate C2, 03, Cu2 during shifting, and during this time change the speed by continuously variable transmission mechanism 2. (3) Maximum speed (T η C1, C3, Activate C4 (51 Reverse Activate C1, B3, 04).

The clutches and brakes described above are operated with appropriate pressure and time lag to reduce shocks during startup and gear changes. The operating status of each member at each stage is as follows.

+1) During startup and low speed, the link gear II of the first planetary gear mechanism 3 is the brake Bl.
Therefore, when the sun gear 9 rotates, the carrier 14 of the planetary gear 13, that is, the output shaft 15 rotates.

In the second planetary gear mechanism 4, the clutches c3 and C4 are sequentially connected, so the planetary gear 21 does not rotate, and the sun gear 18 and ring gear 2o are integrated to rotate the output shaft 22 at a low speed.

(2) When the clutch C2 is operated, the belt-driven continuously variable transmission mechanism 2 is connected to the ring gear 11 of the first planetary gear mechanism 3, and the operation of the ring gear 11 shifts the carrier 14. In the second planetary gear mechanism 4, there is no change in the rotation speed. Therefore, the rotation speed of the output shaft 22 is controlled by the position of the endless belt 8 of the continuously variable transmission mechanism 2.

(3) At maximum speed (top) At the top, the sun gear 9 and ring gear 11 are integrated by the operation of the clutch C1, the planetary gear 13 does not rotate, and the output shaft 15 on the carrier 14 It rotates at the same rotation speed as the gear 9, that is, the engine output shaft l. In the second planetary gear mechanism 3, the rotation speed does not change, and the output shaft 22 rotates at the same speed as the engine output shaft 1.

(4) During speed-up driving (overdrive) The output shaft 15 of the first planetary gear mechanism 3 rotates at the same rotation speed as the output shaft 1 of the engine, as in the case of the top. Second planetary gear mechanism 4
In this case, the sun gear 18 is fixed by the brake B2, and the planetary gear 21 rotates around the outer circumference of the sun gear 18 by the carrier 23, which is connected to the engine output shaft 1 by the clutch C3. Therefore, it is directly connected to the engine output shaft 1. The planetary gear 21 attached to the carrier 23 rotates around the sun gear 18 and rotates around the ring gear 2.
o That is, the speed of the output shaft 22 is increased. (5) The link gear 11 of the reverse first planetary gear mechanism 3 is activated by the brake Bl.
Therefore, when the sun gear 9 rotates, the key ridge 14 of the planetary gear 13, that is, the output shaft 15 rotates. In the second planetary gear mechanism 4.

The carrier 23 of the planetary gear 21 is fixed by a brake B3, and the sun gear 18 is connected to the output shaft 15 of the first planetary gear mechanism 3 by the engagement of the clutch 4 of the boss portion 19. The rotation of the sun gear 18 causes the ring gear 2o, that is, the output shaft 22, to reverse rotation via the planetary gear 21.

As described above, the present invention combines the belt-type continuously variable transmission mechanism 2 and the first planetary gear mechanism 3, which are each connected to the output shaft of an engine, and is added to the belt-type continuously variable transmission mechanism 2. The configuration controls the rotation speed of the output concentrated on the output shaft of the first planetary gear mechanism 3 by changing the speed of the engine output to a predetermined rotation speed and transmitting it to the first planetary gear mechanism 2.

Furthermore, the second planetary gear mechanism 4, which has a simple structure, is connected to the first planetary gear mechanism 3 to perform overdrive and reverse movement.

Effects of the Invention The effects of the present invention are that the conventional belt-type continuously variable transmission mechanism can be used in large-sized engines without deteriorating its durability, and that by attaching the second planetary gear mechanism 4, reverse speed can be improved. In addition, a continuously variable transmission with an overdrive function can be easily manufactured.

[Brief explanation of drawings]

The accompanying drawings are schematic diagrams showing the configuration of the continuously variable transmission of the present invention. ] Engine output shaft 2 Belt-driven continuously variable transmission mechanism 3
First planetary gear mechanism 4 Second planetary gear mechanism 5 Continuously variable speed pulley 6 Continuously variable speed pulley 7a, 7b Spur gear 8 Endless belt 9 Sun gear 10 Device of the present invention 11 Ring gear 12 Sun gear rotation axis 13
Planetary gear 14 Planetary gear carrier 15
Output shaft 16 of the first planetary gear mechanism
Ring gear boss portions 17a, 17b Spur gear 18 Sun gear 19 Sun gear boss portion 20
Ring gear 21 Planetary gear 22 Output shaft

Claims (1)

[Claims] A belt-driven continuously variable transmission mechanism that includes a pair of continuously variable transmission gears, one of which is connected to the output shaft of the engine via a spur gear, and the output shaft is the rotating shaft of the other continuously variable gear. and a first planetary gear mechanism in which a sun gear is directly connected to the output shaft of the engine, a ring gear is connected to the output shaft of the continuously variable transmission mechanism via a spur gear, and the output shaft is attached to the carrier of the planetary gear. and a second planetary gear mechanism in which the sun gear is connected to the output shaft of the first planetary gear mechanism, and the output shaft is mounted on the center line of the ring gear, and the first planetary gear mechanism is connected to the output shaft of the first planetary gear mechanism. a first brake for braking the sun gear, a first clutch inserted between the rotating shaft of the sun gear and the ring gear, and the boss portion that meshes with the ring gear and the spur gear on the output shaft of the continuously variable transmission. The second planetary gear mechanism includes a second clutch inserted between the upper spur gear and the second brake that brakes the sun gear, a third brake that brakes the carrier of the planet gear, and a carrier of the sun gear and the planet gear. a third clutch inserted between the central shaft and the second clutch;
A continuously variable transmission comprising a fourth clutch attached to a sun gear located between the brake and the third clutch.