JPS61202924A - Wheel boss drive with planetary gear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an overall length motor in which a pinion shaft, a planetary gear, a planetary carrier caning and a wheel boss are movably supported, and an internal gear is fixedly connected to the shaft casing member via a connecting wheel. The present invention relates to a wheel boss drive device with a planetary gear device having a short length. Wheel hub drives of this type are used in particular in drive shafts of working machines, such as, for example, self-propelled excavators, loaders or earthmoving machines.

In the case of the aforementioned wheel boss drive, the planetary carrier casing containing the planetary gear is connected to the wheel boss rotatably supported on the shaft caning member and the reaction force of the fixed internal gear of the planetary gearing is Transmits torque to the coupling wheel and shaft casing member. Traditionally, spline joints have been used to removably and torque-transmittingly connect the coupling wheel to the shaft casing member. In the case of this spline joint, the coupling wheel has a boss with axial internal teeth, is inserted into the axial external teeth of the end of the shaft casing part, and is axially mounted on the shaft casing part by means of a locking nut. is maintained. This spline joint between the coupling wheel and the shaft housing part has the disadvantage that it requires a relatively large axial space for the wheel hub drive. This large space requirement increases the manufacturing costs of the wheel hub drive and, if the axle is provided with individual tires, causes the wheel hub drive to protrude outward from the wheel rim. In this case, the spacing between the wheel edges cannot be used effectively, since the two protruding wheel hub drives must comply with the vehicle width permitted for road traffic. In the case of an axle without hinges, the axle housing part, which also includes a differential between the two wheel hub drives, is formed as a separate axle tube in the area of each wheel hub drive.

This makes it possible to economically form the axial teeth of the spline joint on this axle tube, which is removable from the other axle housing parts. In the case of a hinged axle in which the swingable shaft journal includes an axle tube that is separated from other axle casing members, the axle tube can be rotated about its longitudinal axis on a machine tool to open the axial teeth. It is necessary to limit the dimensions of the axle journal swing hinge in the axle tube diameter in order to be able to fabricate it by milling or, especially if the axle journal includes a monolithically cast link lever. It requires large and expensive machine tools to enable said rotation of the axle tube.

The object of the invention is to form a wheel hub drive of the type mentioned at the outset in the following manner. That is,
In order to eliminate the above-mentioned drawbacks of conventional wheel boss drives, the space requirements of the coupling for removably and reaction torque-transferable coupling of the coupling wheel to the shaft casing member and the wheel boss drive The space required is small, the connecting parts of this joint can be manufactured at low cost, and the connecting parts can be easily manufactured with ordinary machine tools, and can be easily manufactured using a shaft journal with a link lever that is cast in one piece. The connecting part is designed so that it can also be manufactured and formed into a separate removable axle tube.

This object is achieved in accordance with the invention in that the coupling wheel is flange-fixedly connected to the shaft housing nog part via a complementary and frictional toothing on the end side. Hereinafter, the structure of the wheel boss drive device according to the present invention, its advantages, and preferred embodiments of the present invention will be explained in detail with reference to the drawings.

The figure shows an embodiment of a wheel boss drive device according to the present invention.

At the end of the shaft caning member l, there is a driven wheel boss 2.
is rotatably supported by a rolling bearing. At the end of the axle caning member 1, a planetary gear system for driving the wheel hub 2 is furthermore provided. This planetary gear train consists of a pinion shaft 3 guided through a shaft casing member 1 , a planetary carrier casing 4 and an internal gear 6 . The pinion shaft 3 is equipped at its end with a so-called sun gear of a planetary gear system. A planetary gear 5 meshing with a sun gear is mounted on the planet carrier casing 4, and the planet carrier casing is connected to the wheel hub 2 for rotatable bearing and drive power transmission. The internal gear 6 meshes with the planetary gear and is fixedly connected to the shaft casing song member 1 for transmission of reaction force torque. A coupling wheel 7 serves this coupling. The coupling wheel 7 has its external toothing on its outer periphery meshing with the internal toothing of the internal gear and is connected to the shaft casing part I in a relatively rotationally fixed and removable manner.

According to the invention, the removable connection between the coupling wheel 7 and the shaft casing song member 1 for transmitting the reaction torque is
The coupling wheel and the axle caning member are provided with snug teeth on their mutually facing end faces, and the coupling wheel is configured to be flange-fixedly connected to the end face of the axle casing member. In the illustrated embodiment, this end face toothing consists of four teeth 8 (see FIG. 2) projecting axially from the end face of the coupling wheel 7 and axially extending from the end face of the shaft casing part l. It consists of a tooth gap 9 which is recessed into the tooth and fits snugly into the tooth. The connecting wheel 7 and the shaft casing member 1 have teeth 8 and tooth gaps 9.
At the hole 10. for the connecting bolt 12. II. The connecting wheel 7 is removably bolted to the end face of the shaft casing song 1 by means of a connecting bolt. The coupling bolt interlocks the toothings on the opposite end faces of the coupling wheel and the shaft casing member.

The four teeth 8 and the tooth gaps 9 on the end faces of the coupling wheel and the shaft casing part form end face teeth. This toothed portion is arranged in two directions perpendicular to the wheel boss drive center line.
Shape-complementary and frictional engagement along the axis of the book. The end face teeth thereby center the flange stop of the coupling wheel 7 relative to the axle caning member 1 and ensure that any radially directed lateral forces perpendicular to the wheel hub drive center line are coupled Avoid acting on the bolt 12. The circumferential flanks of the tooth 8 and the tooth gap 9 preferably form an angle that is not 90 degrees with the axial tooth root or tooth gap root. Thereby, even if circumferential engagement play should occur in the toothed end portion when the connecting wheel 7 is axially flanged to the shaft casing member 8, this play can be automatically removed. . In this case, it is advantageous if the engagement angle of the circumferential sides of the teeth 8 and the tooth gap 9 is smaller than the friction angle. As a result, when transmitting the reaction force from the connecting wheel 7 to the shaft casing member 1, no additional axial component force that loads the connecting bolt 2 is generated.

As mentioned above, the toothed portion 8 provided on the end face of the coupling wheel and the shaft casing member provides a complementary and frictional connection.
．． The releasably and torque-transmissible coupling of the coupling wheel 7 to the shaft housing part l by means of 9 has the following advantages. That is, the space required in the axial direction of this connecting portion is very small, and the toothed portion on the end face side can be formed on the shaft caning member using a simple machine tool and at low cost. Moreover, when the axle caning member is not a separate axle tube that is removable from the rest of the unhinged axle, or when the axle caning member is an axle journal of a hinged axle formed by a monolithic link lever, At some time, teeth may be formed on the shaft casing member in the manner described above.

[Brief explanation of drawings]

FIG. 1 is an axial longitudinal sectional view of the wheel boss drive device, and FIGS. 2 and 3 are perspective views of two parts of the wheel boss drive device. 1... Shaft casing member 2... Wheel boss 3... Binion shaft 4... Planetary carrier caning 5... Planetary gear 6... Internal gear 7... Connection wheel 8.9.・・dentate part

Claims (1)

[Claims] 1. A pinion shaft (3), a planetary gear (5), a planetary carrier casing (4), and a wheel boss (2) are movably supported, and an internal gear (6) is connected to a connecting wheel (7). In a wheel boss drive with a planetary gearing of short overall length, which is fixedly connected to the shaft housing part (1) via a Wheel boss drive, characterized in that it is flange-fixedly connected to the shaft casing part (1) via the parts (8, 9). 2. Connecting wheel (7) or shaft casing member (1)
has at least three teeth (8) or tooth gaps (9) on the end face of the
2. A device as claimed in claim 1, characterized in that the axes are perpendicular to the wheel boss drive centerline along one or more axes. 3. Device according to claim 2, characterized in that the end face is provided with four teeth (8) or tooth gaps (9) arranged symmetrically in the circumferential direction. 4. Teeth (8) are provided on the end face of the coupling wheel (7);
4. Device according to claim 3, characterized in that a tooth gap (9) is provided on the end face of the shaft housing part (1). 5. Teeth or tooth gaps together with tooth bases or tooth gap bottoms 9
5. Device according to claim 4, characterized in that it forms an angle other than 0 degrees. 6. The device according to claim 5, wherein the meshing angle of the teeth is smaller than the friction angle. 7. A hole (10) or a screw (11) for the connecting bolt (12) is provided in the tooth (8) or in the shaft casing part (1), according to claim 4. equipment.