Machine element or mechanism – Elements – Gear casings
Patent
1992-05-11
1994-09-13
Luong, Vinh T.
Machine element or mechanism
Elements
Gear casings
475246, F16H 5702
Patent
active
053458397
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a mounting, damped against sound. radiation, of a drive system, especially a hydrostatic transmission, within a vehicle gearbox.
BACKGROUND OF THE INVENTION
In conventional mountings of the aforementioned type described, for example, in DE 3,843,272 A1, the hydrostatic transmission is inserted in the gearbox through an axial aperture. The axial and radial fixation of the hydrostatic transmission with respect to the gearbox is accomplished by cord-like elastic bearing elements, in each case being attached continuously onto continuous bearing surfaces of the hydrostatic transmission on the end side, and engaging, in the installed position, into fitting drilled recesses in the gearbox. Since the bearing surfaces for the elastic bearing elements are attached, for structural reasons, to the outer periphery of the hydrostatic transmission, they have a relatively large diameter. Such diameter, though not generally to be absolutely rejected with a view toward a low specific load and the damping function of the bearing elements, is not a desirable feature, either, due to the associated expensive machining of the casing, since expensive special machinery is needed for a dimensionally accurate machining in the diameter of bearing surfaces of this size.
Moreover, in the know bearing for the torque support of the hydrostatic drive mechanism, additional elastic damping elements are required having a relatively voluminous structure and require a seating in the gearbox and in the hydrostatic transmission that is not easy to provide.
The replacement of inoperative damping elements is furthermore made difficult in that the hydrostatic transmission must for this purpose be removed from the gearbox which process, in turn, is impossible without previously also removing the gear box from the vehicle.
SUMMARY OF THE INVENTION
Starting with a vehicle with the aforedescribed mounting for the hydrostatic transmission an object of the invention resides in providing a bearing that is damped with respect to sound radiation and, with a low specific stress, utilizing damping elements of a relatively small dimension.
In accordance with advantageous features of the present invention, a sound-radiation damped mounting for a drive system is provided, especially for a hydrostatic transmission within a vehicle gearbox, with the sound-radiation damped mounting including structure-borne noise decoupling damping elements arranged in a forward and rearward end zone of the hydrostatic. transmission between the vehicle gearbox and a support for conducting structure-borne noise of the hydrostatic transmission. The hydrostatic transmission may be inserted into the gearbox through a closeable casing wall aperture and is supported, in an operative position, by rods extending transversely to the drive shaft and a driven shaft of the hydrostatic transmission. The rods are supported on the inside by way of annular structure-borne noise decoupling damping elements inserted in through bores of the gearbox and fixedly connected to the casing of the hydrostatic transmission.
Considerable advantages are provided by the invention during the mounting of the hydrostatic transmission and of the damping elements as well as during the manufacturing of the respective structural parts. Thus, due to the fact that the gearbox is accessible even in the installed condition through an opening arranged suitably at the bottom or at the top, the installation and dismounting of the hydrostatic transmission on the occasion of vehicle assembly or repair is made simpler than previously since the gearbox or the adjoining casings need not be disassembled for this purpose. A satisfactory coaxial orientation of the input and output shafts of the hydrostatic transmission with the connecting shafts can be conveniently achieved by first coupling the respective shafts together, after laying out the rod-shaped supports, before the hydrostatic transmission is fixed on the rod-shaped supports having relatively small transverse dimension
REFERENCES:
patent: 4597310 (1986-07-01), Panttila
patent: 4686868 (1987-08-01), Heidrich
patent: 4803896 (1989-02-01), MacGregor
patent: 5125289 (1992-06-01), Heidrich
patent: 5138903 (1992-08-01), Grossenbacher
Heindl Richard
Hommel Rainer
Honzek Robert
Nett Hans-Peter
Luong Vinh T.
Xaver Fendt & Company
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