Machine element or mechanism – Gearing – With fluid drive
Patent
1984-04-25
1986-04-22
Krizmanich, George H.
Machine element or mechanism
Gearing
With fluid drive
91499, F16H 4700
Patent
active
045834253
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a driving mechanism, specially for use as traction motor or servomotor in a working vehicle, including a hydromotor, at least one planetary gear connected at the output and a hollow wheel for torque delivery and a driven main wheel assembly.
Our German laid-open application No. 28 31 458 has disclosed a wheel drive including a hydromotor, planetary gearing connected at the output and a hollow wheel for torque delivery and assembly of a driven main wheel. The latter must be very strongly offset to enable it for its part to deliver torque substantially centrally in the axial direction of the wheel drive. This circumstance implies an expensive installation of the driven main wheel. For the support of the hydromotor and planetary gearing, the already known wheel drive comprises a multiplicity of separate parts. This makes the production of the known drive very costly and maintenance works are made difficult or cannont be carried out at all without disassembling the known drive.
U.S. Pat. No. 4,271,725 has disclosed a motor unit that likewise comprises a hydromotor and planetary gearing connected at the output side. In the known mechanism the longitudinal axis of the hydromotor is angularly displaced with respect to the longitudinal axis of the gearing connected at the output, since this makes the hydromotor at least partly accessible for maintenance works past the control cap associated with the hydromotor. Although a hollow wheel for torque delivery and assembly of a driven main wheel is designed so as to make no longer necessary an offset main wheel made in a costly manufacturing process, the two-part design of the hollow wheel increases the production expenses thereof. Due to the accommodation of the hydromotor, the noise of its operation can escape to the outside unhindered. Its construction as constant motor allows no control in the known drive. Separate bearings are needed for each gear wheel and for this reason and owing to the angularly displaced axis of the hydromotor in respect to the driving longitudinal axis, the known drive needs relatively much assembly space.
The invention is based on the problem of providing a driving mechanism, specially for use as a traction motor or servomotor in working vehicles, that has a compact construction, is amenable to servicing, allows the mounting of a simple main wheel such as a dredging wheel constructed as simply as possible, and is made as soundproof as possible. The driving mechanism must have the smallest possible outer dimensions so as not to project sidewise beyond the width of a track wheel of a caterpillar excavator.
This problem is solved by the features stated in the characteristic part of Claim 1.
The invention has a series of advantages in comparison with the already known drives. Thus, the low-cost production of the driving mechanism is already made possible by the fact that there is provided for absorbing the bearing pressures from the outside a hub support that in addition can also serve as support member for a planetary gearing at the driving side, that is further an assembly frame for part of the brake, and that also keeps the hydromotor in place and overlaps the whole longitudinal extension thereof. Hereby the hydromotor is also effectively checked as to noises.
According to an embodiment of the invention, the hollow wheel rotates on two bearings that for their part are supported on the hub support. More bearings or additional extensions of the hollow wheel are not needed here like they are in the already known objects.
According to another embodiment of the invention, the hollow wheel is closed at the front by a gear cap. By virtue of this step it is possible to reduce the production cost of the tractor motor and to broaden the possibilities for maintenance works and for the exchange of gear parts in order, for instance, to change the gear transmission, for after removing the gear cap, the gear mechanics with the planetary gear is immediately exposed.
Another embodiment of the invention contemplates that between the ho
REFERENCES:
patent: 3439766 (1969-04-01), Dence et al.
patent: 4114737 (1978-09-01), Fukui
patent: 4207804 (1980-06-01), Fukui
patent: 4271725 (1981-06-01), Takao et al.
patent: 4275616 (1981-06-01), Ehrlinger et al.
Eymuller Helmut
Mann Egon
Krizmanich George H.
Wright Dirk
Zahnradfabrik Friedrichshafen AG
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