CZ296990B6 - Method for axial clearance adjustment of tapered roller bearing system and toothed wheel interposed therebetween of particularly traction vehicle gearbox input section - Google Patents

Abstract

In the present invention, there is disclosed a method for axial clearance adjustment of a system of two tapered roller bearings (2, 6), i.e. an internal tapered roller bearing (6) and an external tapered roller bearing (2), and toothed wheel (11) interposed therebetween, wherein in functional state the bearings being put on a conical driving pinion (10) of particularly traction vehicle gearbox input section along with spacer rings (1, 5) intended to adjust clearance thereof and pressed by a thrust element in the direction toward a bevel gearing of the driving pinion (10) wherein said system is secured in axial direction in its position by a securing element. First, the system is put freely, without the spacer rings (1, 5) onto a shaft of the conical driving pinion (10) and subsequently it is pressed in the direction toward the bevel gearing thereof up to the extreme position in which the internal tapered roller bearing (6) bears against a gearbox body (17) wall, whereupon a distance between outer race of the external tapered roller bearing (2) and a thrust face of the securing element, for instance a bearing cover (16), is measured in functional position thereof. Subsequently, the distance rings (1, 5) corresponding exactly to the above-measured distance are produced in such a manner that the sum of their thicknesses corresponds to that measured distance, the system is then disassembled and then put again along with the manufactured spacer rings (1, 5) onto the shaft to thereby adjusting axial clearance thereof.

Description

Technical field

The object of the invention is a method of limiting the axial clearance of a tapered roller bearing assembly and a gearwheel of the output portion of a transmission part located therebetween, in particular in two-stage helical-bevel gears of traction rail vehicles.

BACKGROUND OF THE INVENTION

For the transmission of the torque to the drive axle of the presently widespread embodiment of the two-stage helical-bevel gearboxes of traction vehicles, in particular tram vehicles, a drive pinion is generally used with a bevel end gear which engages the gear ring of the drive axle. On the pinion, mounted in two tapered roller bearings to absorb the axial force, there is a gear with a spur gear that engages the input spur. The input front pinion is then mounted in one roller and two tapered roller bearings to absorb the radial and axial forces. The bearings used have relatively low service life, mainly tapered roller bearings on the front pinion due to inaccurate delimitation of axial clearances. The clearance clearance in the bearings is carried out by sets of spacing plates, in this way of defining the axial clearance gradually and in the final phase significantly increases and consequently decreases the service life of the bearings and the teeth of the conical pinion. The axial clearance is defined by spacers of different thicknesses, and it is rarely possible to find a suitable combination of thicknesses of the individual washers to precisely define the clearance. This results in an increase in axial clearances and a decrease in the engagement quality of the bevel pinion with respect to the gear wheel and, when the direction of rotation of the gear wheel or the torque flow changes, dynamic shocks occur which further increase the axial clearance.

SUMMARY OF THE INVENTION

The present invention relates to a method of defining the axial clearance of a pair of tapered roller bearings, an inner tapered roller bearing and an outer tapered roller bearing, and an interposed gearwheel which are in operative condition together with spacers mounted on the tapered drive pinion of the traction vehicle gearbox. gearbox housing surfaces, which are pushed by a thrust member in the direction of the bevel gearing of the drive pinion, wherein said assembly is secured in its axial direction in its position by a locking member, for example a shaft nut. SUMMARY OF THE INVENTION [0003] The system is first to be freely mounted on the shaft of the conical drive pinion without spacers and pushes it towards its bevel gear up to the extreme position in which the inner tapered bearing bears against the wall of the gear housing. between the outer ring of the outer tapered roller bearing and the abutment surface of the locking member, for example the bearing cap, in its operative position and the spacers are precisely made to this size so that the sum of their thicknesses corresponds to this measured distance; spacers, thereby fixing its axial play. The thrust member may be formed by a shaft nut adjacent to the inner ring of the outer tapered roller bearing in operative condition. The locking member may be formed by a bearing wedge axially fixing the outer ring of the outer tapered roller bearing attached to the transmission housing to the center.

The advantage is to achieve accurate and stable alignment of the pinion shaft and the front pinion in the output part of the gearbox, further unifying the service life of all bearing nodes. A long service life of the gear bearings without subsequent adjustments and repairs is guaranteed and also the noise of the transmission system is significantly reduced.

-1 CZ 296990 B6

Overview of the figure in the drawing

In the accompanying drawing, an example of an embodiment of the present invention is shown;

DETAILED DESCRIPTION OF THE INVENTION

On the bevel drive pinion 10 of the output portion of a two-stage gearbox of a traction vehicle, for example a tram vehicle, which is provided with shoulder at its outer end, an internal tapered bearing 6, a gear 11 with spur gear for transmitting torque from the input front pinion 12 This outer tapered roller bearing 2 is secured in position by a shaft nut 15 which secures the inner ring of the outer tapered roller bearing 2. The outer rings of the outer and inner tapered roller bearings 2, 6 are fixed in axial direction by precisely ground. This assembly is secured in the axial direction by a bearing cap 16 which is detachably fastened via centering 18 to the transmission housing 17.

To define the taper of the tapered roller bearings 2, 6, precisely ground spacer rings 1, 5 are used, which are individually fitted between the outer ring of the inner tapered roller bearing 6 and the adjacent shoulder of the gearbox housing 17 and the outer ring of the outer tapered roller bearing 2 and the bearing cap 16. To determine the exact thickness of the spacer rings 1, 5 required, proceed as follows. The conical drive pinion assembly 10 with the inner tapered roller bearing 6, the spur gear 11 and the outer tapered roller bearing 2 is first assembled and tightened by the shaft nut 15 until the outer ring of the inner tapered roller bearing 6 rests against the gear housing wall 17 . After assembling this node, the distance from the outer edge of the centering 18 to the outer ring of the outer tapered roller bearing 2 is measured and the bearing cap step height 16 is subtracted from this measured value. The calculated value represents the amount of total clearance which must be precisely defined by the spacer rings! and 5. The spacers 1, 5 are precisely ground so that the sum of their thicknesses exactly matches the calculated amount of total clearance. As already mentioned, these precision spacers 5, 5 are then fitted individually between the outer ring of the inner tapered roller bearing 6 and the adjacent shoulder of the gear housing housing 17 and the outer ring of the outer tapered roller bearing 2 and the bearing cap 16. After subsequently tightening the shaft nut 15 and the bearing cap 16, the two tapered roller bearings 2, 6 and the gear 11 are fixed axially to the bevel gear drive pinion 10.

Industrial applicability

The present invention is intended to be used in particular in the output portions of gearboxes of traction vehicles, in particular tram vehicles, but is not limited to traction vehicles, as one skilled in the art can also apply its principles as defined in the appended claims to other gears, for example single-stage, and generally for any bearing of the shafts in tapered roller bearings, requiring precise clearance clearance in the axial direction.

Claims (1)

Method for defining the axial clearance of a system of two tapered roller bearings (2, 6), an inner tapered roller bearing (6) and an outer tapered roller bearing (2), and a gear (11) disposed therebetween, mounted on a conical drive pinion (10) ) output parts of a gearbox, in particular a traction vehicle, together with spacers (1, 5) for limiting their axial play, and pressurized by a thrust element in the direction of the bevel gearing of the drive pinion (10), said assembly being secured in its axial direction by its locking member characterized in that the assembly is first loosely mounted on the shaft of the conical drive pinion (10) without the spacers (1,5) and is pushed towards its bevel gear up to the limit position in which the inner tapered roller bearing (6) It rests on the wall of the gearbox housing (17), whereupon the distance between the outer ring is measured the tapered roller bearing (2) and the supporting surface of the securing member, for example the bearing cap (16) in its operative position, and the spacer rings (1, 5) are precisely made to the sum of their thicknesses corresponding to this measured distance. is then disassembled and put back together with the spacers (1, 5) produced, thereby limiting its axial play.