JPS6014045Y2 - Automatic transmission for vehicles - Google Patents

Description

[Detailed description of the invention] This invention relates to an automatic transmission system for automobiles and other vehicles, in which an input shaft connected to an engine and an output shaft connected to wheels are connected to a high-speed transmission system and a low-speed transmission system in parallel with each other. The high-speed transmission system is a gear type, and the low-speed transmission system is a stepless type with a one-way clutch on the output side, and the input side of the high-speed transmission system is A first clutch and a second clutch including a centrifugal clutch are interposed on the input side of the low-speed transmission system, and both clutches are connected to the input side of the low-speed transmission system.
The shifter is configured to be able to open and close freely, and the shift valve is linked to a hydraulically operated member whose hydraulic pressure is controlled by a shift valve that responds to engine output and vehicle speed.

An example of implementing the present invention will be explained with reference to attached drawings.

In the drawing, 1 indicates an input shaft connected to the engine, and 2 indicates an output shaft connected to the wheels. These input shaft 1 and output shaft 2 are connected to each other via a high-speed transmission system 3 and a low-speed transmission system 4, which are parallel to each other. Connect to.

The low-speed transmission system 4 has a variable pulley-type continuously variable automatic transmission mechanism 5 consisting of a pair of variable pulleys 5a, 5a and a belt 5b between both pulleys 5at5a, and a one-way clutch 6 on the output side. This prevents a reverse load from being applied from now on when the high-speed transmission system 3 operates.

The high-speed transmission system 3 is a gear type, and a diaphragm or other gear is connected between its input side and the input side of the low-speed transmission system 4, that is, between the high-speed transmission system 3 and the input shaft 1 and between the low-speed transmission system 4 and the input shaft 1. A first clutch 7 and a second clutch 8 incorporating a centrifugal clutch 8a are interposed so that both clutches 7.8 are arranged on the same axis, and a single common shifter 9 located between them is used to alternately open and close the clutches. I made it.

That is, when the shifter 9 is in the leftward movement position shown in the figure, the diaphragm spring 7b in the case 7a of the first clutch 7 on the left in the drawing is pressed by the shifter 9, so the pressure plate 7c moves to the right and the clutch The second clutch 8 on the right side in the drawing opens at a distance from the facing 7d.
When the pressure on the case 8c is released, the centrifugal clutch 8a, the clutch fan shifter 8d, and the case 8c are pushed together by the self-spring 8b to close them. Next, when the shifter 9 moves to the right in the drawing, the first clutch 7 When the pressure is released and the second clutch 8 is closed, the second clutch 8 is pushed and opened.

This shifter 9 is linked to a hydraulically operated member whose operation is controlled by hydraulic pressure, that is, the shifter 9 is connected to a hydraulic cylinder 1
A hydraulic piston 12 is sprung to one side by a spring 11 in the cylinder 10, and a shift arm 13 is engaged with the shift arm 13. When the vehicle speed is relatively low relative to the engine output, the shift valve 14 moves to the left and closes as shown in the figure, so the piston 12 and therefore the shifter 9 move to the left, so that the second clutch 8 closes. Then, as the vehicle speed increases, the valve 14 moves to the right and the piston 12 and therefore the shifter 9 move to the right due to the pressure oil, so that the first clutch 7 is selectively operated.

For example, as shown in the figure, the shift valve 14 is assumed to have a vehicle speed governor 17 acting on one end thereof via a spring 16, and an accelerator pedal 19 acting on the other end thereof via a spring 18.

To explain its operation, the shifter 9 is normally moved to the left and the second clutch 8 is closed, but from this state the engine, and therefore the input shaft 1, starts and reaches a certain rotation speed. Since the centrifugal clutch 8a in the second clutch 8 is closed, the input shaft 1 is connected to the low-speed transmission system 4 via this, and the output shaft 2 and thus the wheels are driven by this, but when the vehicle continues to run, the vehicle speed is lower than that of the engine. The shift valve 14, which increases significantly compared to the output, moves to the right and opens, and the piston 12 and therefore the shifter 9 move to the right due to pressure oil, pressing the case 8c of the second clutch 8, which opens, and the diaphragm spring of the first clutch 7. Since the pressure on 7d is released and this closes, the input shaft 1 is connected to the high-speed transmission system 3 via this, and the wheels are thus given drive. Next, when the vehicle speed decreases, the input shaft 1 is connected to the high-speed transmission system 3. The initial state is returned to drive by the low-speed transmission system 4, and this is automatically repeated as appropriate.

In this way, according to the present invention, the high-speed transmission system is a gear type, so the high-speed transmission system that is commonly used can efficiently transmit power, and the low-speed transmission system is a stepless type. Because of this, when the vehicle starts, torque conversion between the input and output shafts is performed steplessly, resulting in smooth acceleration.Furthermore, because the low-speed transmission system is equipped with a one-way clutch on the output side, it is possible to achieve high-speed transmission. When the transmission system is driven, the low-speed transmission system is stopped, increasing the life of transmission members such as belts, and the selection between the high-speed transmission system and the low-speed transmission system can be shifted in response to vehicle speed and engine output. Since the first and second clutches are switched open and closed by a single common switch that is linked to a hydraulically operated member operated by a valve, automatic gear changes required for running a vehicle can be quickly performed using an extremely simple mechanism. In addition, it can be performed reliably, eliminates the complicated hydraulic circuit required in conventional devices of this type, and also eliminates the complexity of the mechanism in conventional devices, such as supplying hydraulic pressure to the rotating clutch section. It has the following effects.

[Brief explanation of the drawing]

The drawing is a system diagram of an example of the device of the present invention. 1...Input shaft, 2...Output shaft, 3...
...High speed transmission system, 4...Low speed transmission system, 7.
...First clutch, 8...Second clutch, 9...Shifter, 12...Hydraulic piston, 14...Shift valve.

Claims (1)

[Scope of utility model registration request] An input shaft connected to the engine and an output shaft connected to the wheels are connected to each other via a parallel high-speed transmission system and a low-speed transmission system, in which the high-speed transmission system is a gear type, and the low-speed transmission system is is a stepless type with a one-way clutch on its output side, and a first clutch and a second clutch including a centrifugal clutch are provided on the input side of the high-speed transmission system and the input side of the low-speed transmission system. In this vehicle, both clutches are configured to be able to be opened and closed by a common shifter, and the shifter is linked to a hydraulically operated member whose hydraulic pressure is controlled by a shift valve that responds to engine output and vehicle speed. automatic transmission.