RU2558159C1 - Device to decrease dynamic load at vehicle transmission - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: proposed device comprises engine secured at the vehicle carcass and drive axle engaged therewith by cardan shaft. This device incorporates extra telescopic cardan shaft aligned with reduction gearbox drive shaft. One end of said shaft is articulated with vehicle body without chances of turn relative to its lengthwise axis. Second end is composed of a sleeve with screw grooves. Reduction gearbox drive shaft is made up of two parts coupled by screw slots. Note here that outer part is provided with thrust bearings interacting with said sleeve while screw lines of sleeve grooves and drive shaft slots feature identical spacing.

EFFECT: lower dynamic stress.

2 dwg

Description

The invention relates to transport engineering, in particular to transmissions of wheeled vehicles.

A device is known for reducing the dynamic loading of a vehicle (resulting from rotation of the drive axle relative to the longitudinal axis of the propulsion system), comprising a variable length element, one end of which is pivotally connected to the drive axle housing, and the other end is connected to the vehicle’s skeleton, the drive axle having a gearbox installed with the possibility of rotation of the drive axle housing relative to the axis of the drive wheels, while the variable length element is a rod made in the form of a screw with a nut, moreover, the axles of the traction hinges are parallel to the axis of the driving wheels, the traction screw has the ability to be screwed into the nut to rotate the drive axle housing relative to the axis of the driving wheels when the wheel runs into unevenness, the pitch of the screw and nut helix is determined by the formula

h = 2R / j _p ,

where h is the helix pitch;

R is the distance from the axis of the drive wheels to the axis of the articulated rod on the housing of the drive axle;

j _p - gear ratio.

(Patent RU No. 2192971. Compensator of angular oscillations. IPC 7 B60K 17/32, B60G 9/00, B60G 7/00. Declared December 30, 1999, published October 10, 2001) adopted as a prototype.

A disadvantage of the known device is the design complexity and limited functionality, due to the fact that it cannot be applied to drive axles, in which the axis of rotation of the drive wheels does not coincide with the axis of rotation of the driven gear of the bevel gear of the bridge.

The problem to which the invention is directed is the elimination of fluctuations in the torque transmitted by the transmission to the drive wheels caused by angular vibrations of the drive axle relative to the longitudinal axis (drive shaft of the gearbox of the bridge) of the vehicle arising from its movement along irregularities.

The technical result that can be obtained by using the invention is to reduce the dynamic loading of the vehicle due to compensating changes in the torque transmitted to the drive wheels.

To achieve this result, a device for reducing the dynamic loading of a vehicle, comprising a propulsion system mounted on a vehicle’s frame and a drive axle connected to it by a cardan transmission for transmitting torque to the drive wheels, is mounted with the possibility of angular oscillations relative to the longitudinal axis of the gearbox, which, according to the invention equipped with an additional telescopic propeller shaft located coaxially with the drive shaft, one end of which is articulated mounted on the vehicle body without the possibility of rotation relative to the longitudinal axis, and the second end of which is made in the form of a pipe with screw grooves interacting with the stops fixed on the housing of the drive axle, while the drive shaft of the gearbox is made of two parts interconnected by screw slots, while one of the parts is equipped with a thrust bearing interacting with the pipe, and the helical lines of the pipe and the sleeve are made with the same steps.

The invention is illustrated by drawings, where Fig. 1 shows a longitudinal section of a vehicle transmission from a propulsion system to a drive axle, Fig. 2 is a view A in Fig. 1.

A device for reducing the dynamic load of a vehicle (Fig. 1) comprises an output shaft 1 of a power unit 2 connected by a driveshaft 3 with a coupling 4 mounted on the screw splines of the drive shaft 5 of the drive axle reducer 6 of the vehicle. Between the housing of the drive axle 6 and the housing of the power unit 2, a pivotally telescopic driveshaft 7 is fixed with a sleeve 11 that can move longitudinally along the axis of the shaft 7. The telescopic driveshaft 7 is attached at one end to the housing of the power unit 2, and its other end, made in the form bushings 11 with screw grooves 8 (Fig. 2), interacts with the stops 9 (Fig. 1), rigidly fixed to the skeleton of the drive axle 6, and, at the same time, through the bearing 10, with the coupling 4.

The operation of the device is as follows.

During the rotation of the drive axle 6 of the longitudinal axis of the gearbox, the stops 9 act through the screw grooves on the sleeve 11, moving it along the longitudinal axis of the drive shaft of the gearbox. In this case, the coupling 4 will shift along the axis of the shaft 5. Since the coupling 4 on the shaft 5 is mounted on screw slots, with the axial displacement of the coupling 4, the shaft 5 will receive an additional angle of rotation. If the steps of the helical lines in the spline connection of the parts 4 and 5 and the screw grooves 8 of the sleeve 11 are equal, the angle of rotation of the drive axle 6 relative to the power unit 2 will be equal to the additional angle of rotation of the shaft 5.

Thus, changes in the transmitted torque caused by unevenness, angular vibrations of the vehicle’s drive axle around its drive shaft are compensated by the corresponding additional twisting of the gear drive shaft, provided by the longitudinal displacement of the connecting spline sleeve relative to the splined ends of the shafts in the transmission chain torque from the propulsion system to the drive wheels.

Claims (1)

A device for reducing the dynamic loading of a vehicle’s transmission, comprising a propulsion system mounted on the vehicle’s skeleton and a drive axle connected to it by a cardan transmission, angularly fixed relative to the longitudinal axis of the drive axle gearbox, characterized in that it is provided with an additional axial gearbox shaft located coaxially telescopic cardan shaft, one end of which is pivotally mounted on the vehicle body without the axis of rotation relative to its longitudinal axis, and the second end is made in the form of a sleeve with screw grooves interacting with stops fixed to the housing of the drive axle, while the drive shaft of the gearbox is made of two parts interconnected by screw slots, while the outer part is provided with a stop the bearing interacting with the mentioned sleeve, and the helical lines of the grooves of the sleeve and the splines of the drive shaft are made with the same steps.

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