SU1235765A1 - System for automatic controlling of vehicle gear-box - Google Patents

Description

This invention relates to a transport engineering, in particular to transmission control systems.

The purpose of the invention is to enhance the functionality and increase the reliability of operation of the gearbox with two dual friction clutches.

The drawing is a schematic diagram of the automatic control system of a five-speed gearbox.

The proposed system contains a source of 1 pressure of working fluid, a pressure reducing valve 2 of the main line, solenoid valves 3-5 for switching gears switched by an electronic control unit (not shown), a smoothly moving valve 6 and two double friction drives: an input drive 7 and an output drive 8 , includes cylinder 9 with two pistons 10 and 11, located one in the other and forming cavities 12-15, whose cross sections are pairwise equal.

Cavity 12 is connected to the main line 16 via a soft-start valve, and cavities 13-15 are connected to a source of pressure of the working fluid through the electromagnetic valves 3-5 for engaging gears.

The automatic control system works as follows.

Switching on the I gear is provided by moving the gear coupling 17 of the reverse mechanism 18 to the extreme right position (forward movement) and turning on the smooth-moving valve 6 that connects the main line 16 to the cavity 12 of the drive 7. By means of pressure in the cavity 12, the piston 10 of the drive 7, mixing, smoothly turns on the friction clutch 19. The switching on of the P gear is ensured by turning on the electromagnetic valve 4, which connects the main line 16 to the cavity 14 of the drive 8. By means of pressure in the cavity 14, the piston 10 of the drive 8 moves Switches on the friction clutch 20, the free wheeling mechanism 21 is turned off automatically.

The transmission is turned on 111 when the solenoid valve 4 is turned on by turning on the solenoid valve 3 that connects the main line 16 to the cavity 13 of the actuator 7, the pressure in which provides simultaneous and smooth switching from the friction clutch 19 to the friction clutch 22 by increasing the force on the piston 11 of the actuator 7 and

Compiled by L. Bfykov

Editor A. ShishkinaTehred I. VeresKorrektor M. Demchik

Order 2974/16 Circulation 647Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35. Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod ,, st. Project, 4

reducing the force on the piston 10. After balancing the force on the piston 10 on both sides (cavities 12 and 13 have an equal cross-sectional area) the piston 10 under the action of the sliding elements of the friction clutch 19 (not shown) returns to its original position.

To switch on the IV transmission (direct), the solenoid valve 3 is turned off and the solenoid valve 5 is turned on when the solenoid valve 4 is turned on. Simultaneous smooth switching from the friction clutch 22 to the friction clutch 19 and from the friction clutch 20 to the friction clutch 23 occurs.

In the first case, the pressure is relieved from the cavity 13, under the action of pressure in cavity 12 (it is always there from the moment of smooth moving of the vehicle), the piston 10 of the actuator 7 during its movement turns on the friction clutch 19, and the piston 11 returns by the action of the sliding elements of the friction clutch 22 to the starting position.

In the second case, pressure is applied to the cavity 15, the force builds up on the piston 11 of the actuator 8 and decreases on the piston 10. After the force on the piston 10 is balanced on both sides (cavities 14 and 15 have an equal cross-sectional area), it is under the action of sliding elements of the friction clutch, 20 returns to the starting position.

To switch on the V gear (higher), the solenoid valve 3 is turned on with the solenoid valves 4 and 5 turned on, and there is a simultaneous and smooth switching from the friction clutch 19 to the friction clutch 22, as ri in the case of shifting from the II gear to 111. Downward occurs in a similar manner in reverse order.

To engage the reverse gear, the toothed clutch carriage 17 should be set to the extreme left position and the smooth-running valve 6 connecting the main line with the cavity 12 should be turned on to ensure smooth engagement of the friction clutch 19 by the piston 10 of the actuator 7.

Structurally, the combined pistons and actuator cylinders with dual friction clutches ensure smooth switching between these clutches due to the simultaneous increase in pressure in one cavity and decrease in the other.

Claims (1)

AUTOMATIC GEARBOX CONTROL SYSTEM OF THE VEHICLE, containing electromagnetic gearshift valves connected to a working fluid pressure source with a pressure reducing valve, a smooth starting valve and a dual friction clutch actuator installed at the gearbox inlet, including a cylinder with two pistons, I -14 ^ ----- 6 ---------- female in one another, and both cavities formed in this case have equal cross-sectional areas, while one of them is connected to the main line through a smooth starting valve, characterized the fact that, in order to expand the functionality and improve the reliability of the gearbox with two dual friction clutches, it is equipped with a drive of a second dual friction clutch installed at the output of the gearbox, while both cavities of the drive of the friction clutch installed at the output, and the second The drive shaft of the friction clutch installed at the inlet is connected to the working fluid pressure source through the corresponding electromagnetic <g valves. SU „„ 1235765