Machine element or mechanism – Gearing – Directly cooperating gears
Reexamination Certificate
1999-09-09
2001-10-30
Herrmann, Allan D. (Department: 3682)
Machine element or mechanism
Gearing
Directly cooperating gears
C074S60600R, C464S160000
Reexamination Certificate
active
06308588
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a drive for driving, or drives in, agricultural implements. The drive includes a drive housing with a first shaft rotatably supported around a first axis of rotation in the drive housing. One shaft end projects from the drive housing. The shaft also carries a first gear. A second shaft is rotatably supported around a second axis of rotation in the drive housing. One shaft end of the second shaft projects from the drive housing and the other end carries a second gear. The first gear and the second gear engage one another.
DE 196 43 559 A1 discloses an angle drive, especially for driving or drives in agricultural implements. Here, two bevel gears are arranged on two axes of rotation which are positioned perpendicularly relative to one another. The shafts intersect one another, with the bevel gears engaging one another and being enclosed by a drive housing.
DE 44 45 634 C2 describes a coupling which serves to establish a driving connection in agricultural implement drives. The coupling transmits torque. A coupling hub and a coupling sleeve are designed to freely rotate relative to one another over a limited angle of rotation. Thus, a driveshaft, which is to be connected to the power take-off shaft of a tractor to establish a driving connection with an agricultural implement, is easily coupled by means of its connecting means to the power take-off shaft.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a drive which, when used in an agricultural implement driveline, facilitates the coupling operation. The drive achieves a driving connection with the tractor or individual drive parts with the main drive.
In accordance with the invention, the drive includes a drive housing, with a first shaft. The first shaft is rotatably supported around a first axis of rotation in the drive housing. A first gear is arranged on the first shaft to be axially fixed and rotatable relative thereto to a limited extent. A second shaft is rotatably supported around a second axis of rotation in the drive housing. The second shaft end projects from the drive housings. A second gear is firmly connected to the second shaft in the axial direction and in the direction of rotation. The first gear and the second gear engage one another.
An advantage of this embodiment, which includes connecting means with rotational play integrated into the drive, is the elimination of a connecting means with rotational play arranged in front of the drive. The input shaft and the output shaft of the drive are freely rotatable relative to one another over a limited angle of rotation. Thus, the components of the driving connecting means, which can be moved into corresponding positions relative to one another, are rotatable relative to one another to such an extent that the coupling means easily engage. A journal with a multi-spline profile and a correspondingly shaped bore, with the teeth and gaps aligned relative to one another, enable sliding-on and thus an easy coupling operation. The magnitude of the pitch differences can be selected such that a sufficiently large angle of rotation is available. Thus, with the output shaft of the drive being in a fixed position, a tooth of the driven drive journal coincides, by one pitch, with a gap of the splines of a typical driveshaft, which is standardized for power take-off shaft drives.
Furthermore, a coupling with rotational play integrated into the drive can also be inserted into a driveline of an agricultural implement to enable a slight relative rotation of a driveshaft between an auxiliary drive and a main drive. In the case of implements having driven portions which can be folded into a position of rest while the implement is driven on a road, this measure can facilitate the operation of coupling the implement into the operating position.
According to a further embodiment, the first gear is axially fixed between a first shaft shoulder associated with the first shaft and a first bearing.
According to yet a further embodiment, on one end face, the first gear has at least two axially directed claws. The first shaft includes at least two radial projections. The projections engage the recesses between the claws, with rotational play. This design measure permits a limited rotational movement of the first gear relative to the first shaft.
In a preferred embodiment, the axially directed claws are provided at the end face of the first gear. The end faces the first shaft shoulder. The radial projections of the first shaft are arranged to directly adjoin the first shaft shoulder.
The second gear is preferably axially held between a bearing and a securing nut connected to the second shaft. In the direction of rotation, the second gear is form-fittingly connected to the second shaft. This assembly enables any axial forces acting on the second gear to be transmitted to the second shaft. Furthermore, torque can be transmitted from the second gear to the second shaft.
The invention is preferably used in bevel gear drives. Thus, the first gear and the second gear are designed as bevel gears.
In yet a further embodiment, the first axis of rotation and the second axis of rotation extend at right angles relative to one another and intersect one another.
Finally, it is proposed that the first shaft serves as an input shaft and the second shaft as an output shaft. The input shaft, together with a driveshaft, can serve to be connected to the power take-off shaft of a tractor. The output shaft serves to drive the tools of an agricultural implement.
From the following detailed description, taken in conjunction with the accompanying drawings and subjoined claims, other objects and advantages of the present invention will become apparent to those skilled in the art.
REFERENCES:
patent: 1432954 (1922-10-01), Berthold
patent: 2500723 (1950-03-01), Ware
patent: 3809932 (1974-05-01), Erwin
patent: 4759192 (1988-07-01), Bertram et al.
patent: 4919244 (1990-04-01), Bondioli
patent: 5065639 (1991-11-01), Flanhardt et al.
patent: 5522242 (1996-06-01), Hauser
patent: 5829306 (1998-11-01), Komazaki et al.
patent: 44 45 634 C2 (1997-10-01), None
patent: 196 43 559 A1 (1998-04-01), None
patent: 2161244 A (1986-01-01), None
GKN Walterscheid GmbH
Harness & Dickey & Pierce P.L.C.
Herrmann Allan D.
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