Planetary gear transmission systems or components – With means to vary drive ratio or disconnect drive – With synchronizing clutch or brake
Patent
1992-12-29
1995-02-14
Bonck, Rodney H.
Planetary gear transmission systems or components
With means to vary drive ratio or disconnect drive
With synchronizing clutch or brake
475317, 192 53F, 192 53G, F16H 5710, F16D 2306
Patent
active
053903471
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a range change transmission for vehicles which is designed as a planetary gear having a sun wheel rigidly situated on an output shaft of a main transmission, a planet carrier rigidly connected with an output shaft of the range change transmission and a ring gear which, via a separating clutch concentrically situated with respect to the output or drive shaft, is connectable in a switching step to low ratio of the range change transmission with a transmission casing and in a direct through drive with a drive or output element, said separating clutch having a synchronizing device and an axially movable sliding sleeve whose gearing in two axial end positions of said sliding sleeve can be thrown into gear with a coupling gear respectively on the transmission housing or on the drive or output element.
BACKGROUND OF THE INVENTION
A range change transmission of said kind has been disclosed in DE-A 33 20 431. There the separating clutch has a synchronizing device with two synchronizer rings which respectively cooperate with a bevel surface on the transmission casing and with a bevel surface on a clutch ring rigid with the output shaft.
The invention is based on the problem of reducing the costs for a synchronizing device used on a range change transmission of the above kind.
SUMMARY OF THE INVENTION
According to the invention, said problem is solved by the fact that the synchronizing device has a single-piece synchronizer ring which with both friction faces cooperates with bevel surfaces situated on the transmission casing and on the input or output element. The bevel faces, which form an obtuse angle, have in addition a small axial distance between them. The single-piece synchronizer ring is provided with two friction faces which extend parallel with the bevel faces. A low cost is needed to produce such a synchronizer ring.
According to the invention, lubricant discharge openings must be provided in at least one of the bevel faces. Lubricant slipping from the planetary transmission to the oil sump in the area of the sliding sleeve can, in this manner, flow out again from the synchronizer device via a gap existing between the bevel faces and the lubricant discharge openings.
In addition, according to the invention, between the sliding sleeve and the synchronizer ring can be situated a ring spring which, upon axial movement of the sliding sleeve, moves the synchronizer ring for synchronization against the respective bevel faces. In another embodiment of the invention according to the invention, the planet carrier serving as output element must have a collar axially projecting over a support of planet bolts and on which a clutch body is rigidly situated over a gearing. In this manner the clutch body, upon which the bevel face is also provided, can be designed as a replaceable part. In the same manner it is possible, according to the invention, to guide rigidly on the transmission casing via a gearing a clutch body coordinated with the transmission casing.
The invention also covers two alternative possibilities of the axial movement of the synchronizer ring for synchronization. According to the invention, ramp-like pressure pieces are situated in a U-shaped recess of the synchronizer ring. Said pressure pieces are axially moved by pressure bolts and, in their end position, exert an axial force upon the synchronizer ring. According to the invention, two pressure pieces, each one of which acts in a direction of movement of the shifting operation, can be coordinated with each pressure bolt.
The invention is not limited to the combination of features of the claims. Other possible logical combinations result for the expert from the claims and separate features of the claims according to the exiting problem.
For further explanation of the invention, attention is drawn to the drawings in which an embodiment is shown in simplified manner. In the drawings:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a longitudinal section through a range change transmission with a separating clutch having a sing
REFERENCES:
patent: Re33428 (1990-11-01), Larsson
patent: 1983834 (1934-12-01), Barns
patent: 2504409 (1950-04-01), Haefeli
patent: 2515010 (1950-07-01), Kishline
patent: 4182202 (1980-01-01), Grey
patent: 4667538 (1987-05-01), Larsson
patent: 4821591 (1989-04-01), Adler
patent: 5022506 (1991-06-01), Philippe
patent: 5083993 (1992-01-01), un
Bader Josef
Buri Gerhard
Bonck Rodney H.
Wittels Daniel
Zahnradfabrik Friedrichshafen AG
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