192 clutches and power-stop control – Vortex-flow drive and clutch – Including drive-lockup clutch
Patent
1986-05-20
1988-11-01
Bonck, Rodney H.
192 clutches and power-stop control
Vortex-flow drive and clutch
Including drive-lockup clutch
192 331, F16D 4702
Patent
active
047812796
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a control mechanism for a torque converter with bridge clutch in a hydrodynamic-mechanical combined transmission, especially for motor vehicles.
West German OS No. 31 03 838 has disclosed controlling the charging of a torque converter, the engagement and disengagement of the converter bridge clutch, a cooler circuit and the supply of lubricant for the mechanical transmission with a combined pressure and directional valve.
These mechanisms have proved satisfactory since their construction is simple, in spite of the multiple functions to be carried out.
With further improvement in gearshift quality, especially in automatic transmissions equipped with an electro-hydraulic control mechanism, the above cited solution became unsatisfactory for engaging the bridge clutch; thus, damper has been added to the operating pressure pipe which effects the engagement of the converter bridge clutch in the pressure and directional valve in a manner known per se to soften the closing of the converter bridge clutch.
Despite considerable improvement in the converter bridge, the gearshift is still not equally satisfactory when it comes to opening the converter clutch.
The invention, is, therefore, aimed at solving the problem of improving a control mechanism at the least possible expense so that shocks no longer occur even when the converter clutch is released.
By modulated switching on and off of the operating pressure with a solenoid valve, both to create converter pressure and to actuate the converter bridge clutch, it is possible to obtain in a simple manner a shockless exchange between the activity of the torque converter and that of the bridge. The arrangement of the pulse-modulation process in switching the operating pressure on and off also results in a control mechanism of simple construction.
Whereas in the prior art, a relatively complicated combination converter pressure and directional valve and a throttle together with the solenoid valve served to control only the closing of the converter clutch, in the present embodiment two relatively simple control valves combined with the solenoid valve unchanged in principle and the simple control thereof by an electronic unit already present are sufficient to control both opening and closing for the direct clutch, for instance.
The operational and constructional developments underscore in one embodiment the relative simplicity of the solution to the problem.
Other details of the invention are explained with reference to one embodiment and to one drawing; and the details of the drawing constitute the object of the invention.
In the drawing:
The FIGURE is an embodiment of the control mechanism.
There is arranged a converter pressure valve 1 with a valve body 11 and a piston slide valve 12 with only two control pistons 13, 14 and a spring. Pressure is passed via a system pressure pipe 8 into an annular space 18A and is controlled depending on the position of the control pistons 13 and 14 and on the spring 15, and is fed via the annular space 18B and the converter pressure pipe 9 and thence via the piston hollow space 32 to charge both the converter clutch valve 2 and the converter 3. The valve body 11 also has a third annular space 18C into which passes an operating pressure pipe 41. A fourth annular space 18D communicates with the pressure relief channel 17.
In the converter clutch valve 2 having a valve body 21 and a piston slide valve 22 with four control pistons 23, 24, 25, and 26 there is situated also a spring 27. The system pressure pipe 8 leads both directly into a first annular space 28A and again, via a throttle 81, into a fourth annular space 28D. The second annular space 28D is connected by the pipe 61 with the cooler 6 and the spring space 27A. The third annular space 28C has a connection with the lubrication system of the mechanical transmission across a pipe 7 and a ball valve 71. The fifth annular space 28E is connected with the converter pressure pipe 9 and the sixth annular space 28F with the operating pressure pipe 41.
The torque conver
REFERENCES:
patent: 4023444 (1977-05-01), Murakami
patent: 4428467 (1984-01-01), Hiramatsu
patent: 4448293 (1984-05-01), Maeda
patent: 4457411 (1984-07-01), Hiramatsu
patent: 4458720 (1984-07-01), Gierer
patent: 4558769 (1985-12-01), Neisen
patent: 4577737 (1986-03-01), Niikura et al.
patent: 4582185 (1986-04-01), Grimes et al.
Bonck Rodney H.
Testardi David A.
Zahnradfabrik Friedrichshaften AG
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