SU729407A1 - Electromechanical hear box - Google Patents

Description

one

The invention relates to the field of mechanical engineering and can be used in drives of various machines.

Electromechanical transmissions are known that contain a three-stage gear differential, one of the sun wheels of which is connected to the driven shaft by a kinematic chain, including an electromagnetic slip clutch, having a measles and an inductor 1.

Closest to the invention in technical essence and the achieved result is an electromechanical gearbox containing a differential, an electromagnetic slip clutch, a free wheel mechanism and a device for changing the excitation of clutch 2.

The magnetic system of such gearboxes is a decisive indicator of their mass and size. In addition, these transmissions are characterized by low efficiency values in steady-state operating conditions, and significant overheating of the couplings.

The aim of the invention is to reduce the size and increase the efficiency in the steady state operation of the coupling.

This is achieved by the fact that the electromagnetic clutch is equipped with an additional excitation winding, both central gears of the differential are installed separately on the driven and driving shafts, drove 5 through the free wheeling mechanism (MCX) connected to the differential case, and the satellites are hollow and equipped with cassettes installed in the cavity is rotatable relative to the satellites and is filled with bulk material.

ten

FIG. 1 is a diagram of the gearbox; in fig. 2 is a cross section A-A in FIG. one.

The gearbox contains a stator 1 with windings 2 and 3, measles 4 has a non-magnetic ring in the shape of a truncated cone 5, the inside of which is opposite to the middle of toothed core 6, and outside against one of the excitation windings.

The sunwheel 7 is rigidly mounted on the bore shaft with the core 5, the gear wheel 8 is rigidly mounted on the driven shaft. The carrier 9 is rigidly connected to the trunk 5 and carries hollow satellites 10, inside which

The axles of the satellites freely mounted cassettes 11 filled with bulk material 12. Along the carrier, there are also stops 13, which prevent rotation of the stores through an angle greater than 360 °. The free wheeling mechanism (MCA) 14 is installed between the carrier and the stand.

The transmission works as follows.

In order to ensure that the gearbox operates on a stage with a large gear ratio, the field windings 2 and 3 are not engaged when the engine is running. When this occurs, the MSC is jammed and the differential series works as a simple gearing with a fixed carrier. If the speed of the driven shaft needs to be increased, then the excitation windings 2 and 3 are turned on with the same direction of the excitation current, which corresponds to the fact that the magnetic flux is closed through the stator, measles and core, i.e. operation of the electromagnetic device as a coupling. The driven shaft accelerates to the speed of the lead. But as the speed of the driven shaft increases, the speed of the carrier increases, which leads to the appearance of centrifugal forces acting on unbalanced cassettes with bulk material. The normal component of these forces creates pressure on the surface contact of the bulk material with the inner surface of the drum.

The adhesion between the bulk material cassette and the drum, due to the frictional force proportional to the normal component, contributes to the rotation of the cassette together with the bulk material and the drum. However, this rotation of the cassette will be prevented by the moment of inertia with respect to the axis of rotation of the satellite.

The higher the angular velocity of the driven shaft, the greater the force pressed against the bulk material to the surface of the drum. Thus, the part of the energy transmitted through the friction link increases as the driven shaft accelerates and, finally, the speeds of the driving and driven shaft equalize.

The field windings 2 and 3, when the driven shaft reaches a speed equal to that of the master, are de-energized by the control system. From this point on, the system works as a quasi-elastic coupling.

But when the moment of resistance forces on the driven shaft exceeds the critical value, the clutch works and automatically switches to the operation mode of the gearbox when the MSH is jammed.

Sometimes it is required to switch to the operation mode of the reducer in the case when the moment of resistance forces has not reached the critical value. In this case, windings 2 and 3 are turned on so that the currents in them have the opposite direction. The electromagnetic system begins to operate in the brake mode, which contributes to the transition of its work to the gearbox mode. After the MSX has been wedged, windings 2 and 3 are turned off by the control system.

The technical and economic effect of the invention lies in the fact that the mass and dimensions of the magnetic system can be significantly reduced due to the fact that the largest fraction of the time from the drive shaft

to the slave in clutch mode at small slides will be transmitted due to the friction coupling introduced into the differential.

Since in the clutch mode the system works without slip, this will cause a decrease in heating in steady state and, as a result, an increase in efficiency.

Transmission can be used in various multi-speed drives mechanisms.

Claims (2)

1. USSR author's certificate No. 243030, cl. F 16 H 49/00, 1969. so 2. USSR author's certificate number 241873, cl. F 16 H 49/00, 1969.