PL189257B1 - Driving motor shaft - Google Patents

Abstract

The driving motor shaft contains a straight shaft with two pivots resting on bearings, and a rotor mounted on the shaft. Unique characteristics: The straight shaft is a hollow shaft (1), enclosing a coaxial flexible torsional-flexural shaft (6). The length of the latter is larger than the length of hollow shaft (1). At one end, the shafts (1, 6) are joined to each other by means of known joints, while they are separable. The other end of the flexible torsional-flexural shaft (6) is equipped with a resting pin (7). The driving element of the gear (9) and the pivot (8) are mounted on the resting pin. The pivot is located on one or the other side of the resting pin (7).

Description

The subject of the invention is a shaft of a drive motor, which is used especially in rotary drive motors, in which the rotor is mounted on the shaft between its two support points, as well as in drive units of mining machines, operating in limited space and in difficult operating conditions.

The known shafts of rotary drive motors are manufactured as rigid, straight solid shafts. The shaft of the drive motor as a driving unit in the drive unit driving heavy machines and devices is connected to the shaft of the driven machine by flexible couplings or planetary gears, which reduce the value of the twisting moment acting on the motor shaft during its start-up or in overload conditions during operation.

The disadvantage of the known solutions is that they often do not meet the high requirements for drives of mining machines operating in limited space and in difficult operating conditions due to the large dimensions of their components.

Torsionally flexible flexible shafts, made of elastic materials, used in automotive vehicle suspension systems, which, connected to rocker arms, transmit the torque from the engine to the vehicle wheels.

Multiple-part shafts are also known, including a telescopic shaft. It consists of two parts, one of which is a tube fixed at one end in a locating bearing, inside which a cylinder is slidably mounted, or a second tube is mounted in a second bearing, supporting it in the axis of the outer tube.

The shaft of the drive motor according to the invention, comprising a straight shaft with two bearing-supported trunnions, and a rotor mounted thereon, is characterized in that the straight shaft is a hollow shaft, inside which a torsion-bendable compliant shaft with a length greater than hollow shaft length. The shafts are detachably connected with each other at one end by known connections, and the other end of the torsion-flexure shaft is provided with a rest pin on which the driving gear element is mounted and a pivot pin, which is located on one or the other side of the rest pin .

The shaft of the drive motor, according to the invention, thanks to the use of an additional internal flexible torsion-flexible shaft, which absorbs a part of the torsional moment occurring on the motor shaft during its start-up or in overload conditions during operation, enables protection of the motor as a drive unit against the effects of excessive overloads, thus reducing its failure rate. In addition, the flexible couplings used in the drive unit of the drive unit of various devices allow to eliminate the flexible couplings previously used in reducers and geared motors, at the same time reducing their dimensions.

189 257

The subject of the solution according to the invention is illustrated in an exemplary embodiment in which Fig. 1 shows the shaft for a driving electric motor in half-section and a half-section, and Fig. 2 shows for an internal combustion engine. The shaft, according to the invention, used in the driving electric motor comprises a hollow straight shaft 1 with two trunnions 2, between which the rotor 3 of the motor is mounted. The movable pins 2 of the hollow shaft 1 rest in bearings 4 located in the face plates of the motor housing 5. Inside the hollow shaft 1 is placed a flexible torsion-bendable shaft 6 made of elastic material, with a length greater than that of the hollow shaft 1. Shafts 1, 6 are detachably connected to each other at one end by means of a known spline connection. The other end of the torsion-flexible shaft 6 is provided with a resting pin 7 and a movable pin 8, which is located on one or the other side of the resting pin 7. On the resting pin 7 of the torsion-flexure shaft 6, a driving element of the transmission 9 is mounted in the form of a gear wheel, and the movable pin 8 of this shaft 6 supported in a locating bearing 10 holds the torsion-bendable shaft 6 in the axis of the hollow shaft 1. The flexible torsion-bend shaft 6 is protected against longitudinal displacement by means of a circlip 11. The shaft, according to the invention, it can also be used in other drive units, for example in an internal combustion engine, where when used as the main pin 12 of the crankshaft 13, it protects the drive unit with this type of engine against excessive overloads, while allowing its compact structure.

During engine start-up or in the state of its excessive overload during operation, the internal flexible torsion-bending shaft 6 is properly twisted, taking over part of the torsional moment present on the hollow shaft 1 of the engine, thus protecting it against damage.

Fig.2

189 257

Publishing Department of the UP RP. Circulation of 50 copies

Price PLN 2.00.

Claims (1)

Patent claim The shaft of the drive motor includes a straight shaft with two bearing-supported moving journals and a rotor mounted on it, characterized in that the straight shaft is a hollow shaft (1), inside which is a coaxial torsion-bendable shaft (6) of greater length from the length of the hollow shaft (1), the shafts (1, 6) are detachably connected with each other at one end by known connections, and the other end of the torsion-flexure shaft (6) is provided with a resting pin (7), to which the driving element of the transmission (9) is mounted, and the movement pin (8) which is located on one or the other side of the rest pin (7).