192 clutches and power-stop control – Clutches – Axially engaging
Patent
1986-10-15
1988-06-28
Braun, Leslie A.
192 clutches and power-stop control
Clutches
Axially engaging
192113B, F16D 1372, F16D 1374
Patent
active
047533323
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
This application is a National Phase Application corresponding to the International Application PCT/EP86/00081 filed Feb. 18, 1986 and based, in turn, upon a further application filed in Luxembourg under PCT/EP85/00065 of Feb. 21, 1985 under the International Convention and the Patent Cooperation Treaty and the European Patent Convention.
FIELD OF THE INVENTION
The invention relates to a start and shift clutch arrangement.
BACKGROUND OF THE INVENTION
From German Pat. No. 294 1935 a clutch is known, which is arranged in conjunction with a torque converter and therefore predominantly serves as shift clutch for the interruption of tractive force. In order to be capable of transferring the highest possible energy, the clutch disks are fed with lubricating and cooling oil from the oil pressure system of the torque converter or the transmission. The oil feed occurs only during the clutching-in procedure and the conformation of the clutch is such that a separate sump cannot be formed. In this manner, the mass of the clutch and the churning losses of the clutch is kept small.
During the sliding phase of the clutching sufficient lubrication must be present in order to limit frictional heat. The frictional heat which arises, however, must be carried away reliably in order to avoid overheating. This has the consequence that a pump with greater capacity must be provided because even at slow rotational speed sufficient lubricating and cooling means are required. As a consequence too much energy is withdrawn from the drive shaft and the apparatus works uneconomically.
OBJECT OF THE INVENTION
It is therefore the object of the invention, to provide a start and shift clutch arrangement such that the clutch operates in engaged and disengaged condition with minimal losses and is well lubricated during the sliding or friction generating phase, and the frictional heat is reliably carried away.
SUMMARY OF THE INVENTION
A start and shift clutch arrangement for motor vehicles of the invention with a disk clutch which the friction phase is furnished with cooling lubricating and oil, and is dry in engaged or disengaged condition, provides means for flooding the clutch in the area of the disks via a lubricating oil pressure line. The filling with cooling and lubricating oil is limited by means of a first stand pipe and a second stand pipe effects the rapid emptying of the clutch space in conjunction with a control valve.
Due to the flooding of the clutch space in the space of the disks, optimal lubrication is achieved and frictional heat is thereby minimized. Due to the relatively large amount of liquid, the removal of this heat is good, the first standpipe contributes limiting the filling of the clutch space and removing hot oil.
The second stand pipe assures the rapid emptying of the clutch space. The stand pipes are of very simple construction and requiring only little production effort.
The full flooding of the clutch space in the area of the inner and outer disks moving at different rotational speed permits a longer sliding phase without damage to the disks.
Advantageously, the first stand pipe is disposed on the clutch housing in such manner that the aperture is at the same height as the radially inward oriented ends of the outer disks and the aperture of the second stand pipe is located near the radially outer wall of the clutch space. The first standpipe is connected to the oil reservoir directly, and the second standpipe via the control valve.
For the lubricating and cooling oil supply of the start and shift clutch, a lubricating circuit independent of the lubricating supply for the transmission is provided.
In the lubrication circuit for the start and shift clutch an accumulator can be provided in conjunction with a lubricant reservoir, whereby via a timed solenoid valve an impact of compressed air takes place and upon venting due to the pressure of a spring lubricating and cooling oil is aspirated from the lubricant reservoir by a piston of a accumulator via a check valv
REFERENCES:
patent: 3768613 (1973-10-01), Brunner
patent: 4361217 (1982-11-01), Bieber et al.
patent: 4474278 (1984-10-01), Miura
patent: 4557363 (1985-12-01), Golan
patent: 4624353 (1986-11-01), Sailer et al.
Bieber Gerold
Ebner Otto
Braun Leslie A.
Dubno Herbert
Ross Karl F.
Testardi David A.
Zahnradfabrik Friedrichshafen AG
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