SU1733278A1 - Wheel motor - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in drives of mining, road-building and agricultural machines. The aim of the invention is to simplify the design while reducing weight and dimensions and increase durability. The motor wheel contains a reduction gear 2. performed by the worm. The motor shaft is located coaxially with the screw axis 10, and the diameter of the pitch circumference of the worm gear is d {d tg y / z. where d is the diameter of the connecting rods on the thrust disk of hydraulic engines; y is the angle of inclination of the blocks of hydraulic motors (or the angle of inclination of the washer); i - gear ratio of the worm gear; z is the number of hydraulic motors. In addition, rolling bodies are engaged in the engagement of the screw with the worm wheel. 1 hp f-ly, 3 ill.

Description

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The invention relates to mechanical engineering and can be used in mining, road, construction and agricultural machinery.

The aim of the invention is to simplify the construction while reducing the weight and size parameters and increasing the durability.

FIG. 1 shows the motor-wheel, a general view; in fig. 2 — hydraulic drive device; in fig. 3 is a diagram of the operating forces in the motor wheel.

The motor-wheel is arranged as follows. A worm gearbox 2 is mounted on the frame of the vehicle 1 (Fig. 1), and the wheel 4 is rigidly fixed on the output shaft 3. Hydraulic motors 5, for example, of axial-piston type, are placed along the perimeter of the casing of the worm gearbox.

The reducer 2 (Fig. 2) includes a housing 6, closed by a cover 7. An output shaft 3 is mounted in the supports of the housing and the cover, on which the worm wheel 8 is rigidly fixed. The gear of the worm wheel 8 with the worm has gears 9, and the worm to 10 is connected by a coupling 11 with a hydraulic motor 5. The rolling elements 9 form a gear of the worm gear 8 and are closed into contours through return channels in the wheel body. They are able to circulate freely through the grooves of the screw 10, the grooves along the working surface of the worm gear 8, between the end caps mounted on the wheel 8, and along the return channels (not shown).

The motor-wheel housing is equipped with a number of chambers 13 for mounting the screws of hydraulic actuators according to the number required to obtain a specific torque. The chambers free of hydraulic motors and screws are closed by technological covers 14.

It is known that axial-piston type hydraulic engine mounts are usually overloaded with large axial forces created by the pressure of connecting rods on the thrust disk. The efficiency of the supports in these machines usually determines their resource. To increase the life of axial-piston type hydraulic engines, the working direction of the output shaft (when the machine is most loaded) is taken in the direction that is formed when the worm wheel is pushed by the worm and the worm is installed in the bearings floating in the direction of the hydraulic motor. In this case, the axial force that acts on the screw is transmitted through the coupling to the hydraulic motor shaft and compensates for the axial force acting on the hydraulic motor bearings, from the side

his rods. This increases the life of the hydraulic engines and the motor-wheel as a whole. When changing the direction of rotation (idling of the machine), the load from the worm side is perceived by the thrust bearing mounted on the side opposite to the hydraulic motor (not shown). If other types of hydraulic motors (non-axial-piston) are installed in the device, the worm to 10 is installed in the supports limiting its displacement from two sides.

In order to obtain maximum compensation for the effect of axial force on the supports of the hydraulic motor, the diameter of the pitch circle of the worm gear is taken according to the equation, which is calculated as follows.

Thus, the thrust disk of a hydraulic engine is acted upon by an average force Pcp, which creates an average torque:

Mer - Rsr |.

The force PCp is located in the plane of the thrust disk. The thrust force acting on the hydraulic engine mounts is equal to

Р РСР 2 Mer.

0 tg y d tg y

A torque will develop at the worm wheel (output shaft)

M Mer i z.

Axial force acting on the worm to one drive:

RC 2 M 2 Mer I o1 d to z

To determine the force of full pressure compensation on a thrust disk of a hydraulic engine, RQ and PQ- are equated.

2 Mer I 2 Mer

OK -z

From here

dK

d tg y d tg y

where d is the diameter of the connecting rods on the thrust disk of the hydraulic motor;

y- angle of the cylinder block (washer) of the hydraulic engine;

i is the gear ratio of the worm gear;

z is the number of hydraulic motors installed on the gearbox.

The device works as follows.

When fluid is supplied under pressure, the hydraulic motor 5 rotates the worm to 10, and with it the worm gear 8, and the gearing of which the rolling bodies 9 are placed. The rolling bodies 9 circulate through the channels made in the worm body.

wheels 8. The output shaft 3 of the gearbox drives the wheel 4 to rotate and is its axis. During the working movement of the machine (when it is loaded as much as possible) the worm to 10, mounted in floating supports, transfers the axial load on the screw through coupling 11 to the hydraulic motor shaft, thereby unloading its supports. The efficiency and life of the hydraulic motor and motor-wheel increase. In the reverse (not working) motion of the wheel, the axial forces acting on the worm shaft are perceived by the thrust bearing mounted on the side opposite to the hydraulic motor.

Ф орм ул а and з о б р ё te n and

Claims (2)

1. A motor wheel containing at least one hydraulic motor, through a disconnectable clutch, is associated with a driving element of a reduction gearbox, the driven element of which is connected to the wheel hub, about which, in order to simplify while reducing the weight and size parameters and increasing durability, the reduction gearbox is made worm, the motor shaft is located coaxially with the worm axis, and the diameter oV of the wedge where d is the diameter of the connecting rods on the thrust disk of the hydraulic motor; y- the angle of inclination of the cylinder block of the hydraulic motor; i is the gear ratio of the worm gear; z is the number of hydraulic motors installed on the gearbox. 2. Motor wheel according to Claim 1, characterized in that rolling bodies with a worm wheel accommodate rolling bodies to reduce rolling friction. .z. 7- / figl Fi & W