Machine element or mechanism – Elements – Gear casings
Patent
1995-11-21
1997-05-13
Marmor, Charles A.
Machine element or mechanism
Elements
Gear casings
744115, F16H 5702
Patent
active
056282338
DESCRIPTION:
BRIEF SUMMARY
The invention concerns an arrangement on a transmission casing.
BACKGROUND OF THE INVENTION
In a multi-ratio transmission produced in large quantities, it is already known to situate the planetary gear set of a range-change group, together with the clutch, in an area outside that of the main transmission. The planetary gear set and the clutch are here separated from the main transmission by a partition wall, where shafts and gearshift rods of the main transmission can also be situated. For the support of torques exerted, for instance, by a clutch body of the clutch, the intermediate wall must be designed, for instance, with reinforcing webs or fins, so as to be able to resist the torques that appear. For this purpose, said wall can be firmly clamped between the main transmission and the casing of the range-change group placed outside. This creates difficulties in the aluminum, as result of the necessary pressure.
Idler gears are often supported in the main part of the transmission by bearing studs anchored in the casing of the transmission. The intermediate gears of the reverse gear, in particular, require a separate support, since these (sic) are not connected with the countershafts of the transmission.
A simplified construction of the transmission contributes to the saving of material and assembly time. It is often advantageous here to combine different parts of the assemblies into one structural part, that is, accomplish several functions with only one suitably designed part.
WO 90/10806 has thus disclosed a main casing of a multi-ratio transmission in which is situated a range-change transmission. One element of the clutch is here supported over an intermediate plate of the transmission casing, said intermediate plate being clamped between the casing parts of the main transmission and the range-change transmission. But the intermediate plate shown there is not capable of assuming other functions in the transmission.
SUMMARY OF THE INVENTION
The problem to be solved by the invention is to develop an arrangement so that one part of a transmission can assume other functions.
According to the invention an intermediate casing plate of the main transmission casing is designed in a manner such that the torque exerted on a clutch body of a gearshift device of the planetary gear set in the range-change transmission is supported on said intermediate plate of the casing during the shifting operation. The intermediate casing plate itself is in turn supported on the transmission casing via one or more studs. The studs mentioned here, in an added function as bearing studs, for instance, carry the intermediate gears of the reverse gear. Thus, the bearing stud, otherwise only secured to the casing, is provided with an extended function which can be used for a safer and more efficient support of the cropping out torque and needs no special reinforcement of the intermediate plate of the transmission.
The transmission intermediate plate itself is firmly connected with the transmission casing, for instance, by screw connections. The bearing studs can be supported in the transmission casing by different steps. The bearing studs, for instance, can be axially held by locking rings in holes in the casing. Here, two locking rings are inserted in corresponding cavities on the external diameter of the bearing stud. Both locking rings are respectively supported against casing parts, so that an axial displacement of the bearing studs within the holes is not possible. A support in which the bearing stud abuts on one side on one part in the interior of the transmission casing is likewise possible. On the other end of the bearing stud, on the external diameter thereof, is in turn provided a cavity in which a locking ring meshes. The locking ring here is disposed so as to be supported from inside against the casing and thus prevent an axial displacement of the bearing study in its hole.
The bearing studs can be designed solidly or also have themselves a hole. In such a hole could in turn be supported, for instance, the gearshift
REFERENCES:
patent: 3234808 (1966-02-01), Nelson
patent: 3745847 (1973-07-01), Worner et al.
patent: 4231622 (1980-11-01), Paullin
patent: 4598599 (1986-07-01), Ikemoto
patent: 4706520 (1987-11-01), Sivalingam
patent: 4793200 (1988-12-01), McDonald
patent: 5370014 (1994-12-01), Pigozzi et al.
patent: 5372052 (1994-12-01), Bender
Bader Josef
Buri Gerhard
Battista Mary Ann
Marmor Charles A.
ZF Friedrichshafen AG
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