Machine element or mechanism – Gearing – Interchangeably locked
Patent
1985-05-15
1987-08-11
Staab, Lawrence
Machine element or mechanism
Gearing
Interchangeably locked
74359, F16H 308
Patent
active
046853430
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a powershift gearbox/transmission constructed in sections with a multispeed main transmission, a reversing transmission, a range-change transmission, with shafts, fixed and free gears and synchronizing clutches each with an additional power shiftable friction clutch in two power branches constructed such that the shafts of both power branches are all arranged on two axes.
BACKGROUND OF THE INVENTION
A transmission of this type is known from the German open application No. 32 28 353, FIG. 16. It requires for eight drive speeds and eight reverse speeds a total of 23 gears, 11 gear sets and 10 synchronizing clutches. The friction clutches are separately mounted as two complete individual clutches on two different axes. Two synchronizing clutches of the main transmission are loaded not only by a shaft and the thereto rigidly connected parts of a friction clutch and two synchronizing clutches, but in addition also by four gears constituting a turning mass. The synchronizing clutches of the reverse transmission are loaded by the turning mass of two shafts, of parts of six synchronizing clutches and of a totality of ten gears.
A disadvantage of the corresponding transmission is the size of the mentioned synchronizing clutches or, if not, of their reduced lifespan.
Other disadvantages are the large number of gears and gear sets synchronous clutches, the many and long shafts and therefrom the expensive overall dimensions and weight of the transmission.
OBJECT OF THE INVENTION
It is an object of this invention to improve a transmission of this type to obviate the aforementioned disadvantages.
SUMMARY OF THE INVENTION
This object is achieved, according to the invention in a powershift transmission, especially for tractors, constructed in sections, with a multispeed main transmission, a reversing transmission and a range change transmission, having shafts, fixed gears, free gears and synchronizing clutches and each of them having an additional power shiftable friction clutch in two power branches such that the shafts of both power branches are all arranged on two axes. According to the invention: two primary shafts and an output shaft axially arranged between the two primary shafts; of the double clutch; and of the main transmission.
The resulting transmission has the advantage of significantly reduced structure because a series of parts of the double clutch can be commonly used for both friction clutches and therefore have to be provided only once. It has further the advantage that none of the synchronizing clutches of the main transmission is additionally loaded by the turning mass of four gears.
The free gears of the reversing transmission can be arranged on the output shaft of the double clutch while the free gears of the range-change transmission are arranged on the output shaft of the gear-shift transmission and the reversing transmission and the range-change transmission can have a common intermediate shaft with two fixed gears. The reversing transmission and the range-change transmission can have sychronizing clutches.
Alternatively the free gears of the range-change transmission are arranged on the output shaft of the double clutch, the free gears of the reversing transmission are arranged on the output shaft of the gear shift transmission, the range-change transmission and the reversing transmission have a common intermediate shaft with two fixed gears, and the range-change transmission and the reversing transmission have synchronizing clutches.
A transmission of the invention of this type has, in an embodiment with eight drive speeds and eight reverse speeds, the advantage that it needs only fifteen gears, only six gears sets, and only eight synchronizing clutches. It has further the advantage that only the two least used synchronizing clutches are additionally loaded by the turning mass of only seven gears, namely either the synchronizing clutches of the range-change transmission or the synchronizing clutches of the reversing transmission.
This tran
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Ehrlinger Friedrich J.
Muller Franz
Sailer Hubert
Simon Herbert
Diehl Dwight G.
Dubno Herbert
Lianides Ronald
Ross Karl F.
Staab Lawrence
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