RU1800183C - Impeller seal of rotating shaft - Google Patents

Abstract

Usage: in shaft seals of gearboxes of road construction ma; tires. SUMMARY OF THE INVENTION: an impeller seal comprises a shaft mounted in rolling bearings which are located in a gear housing. The impellers are fixedly mounted on the shaft, pressed accordingly by spacer sleeves, which are mounted on the shaft without the possibility of rotation. Impellers are made in the form of a disk made on a part of the diameter in the direction of the conical to the outer contour. Through the grooves are made on the conical surface of the impeller. 2 s.p. f-ly, 3 ill.

Description

The invention relates to a sealing technique for machine parts, in particular to shaft seals for gearboxes of road construction machines.

The aim of the invention is to increase the reliability of a shaft rotating shaft seal with a high frequency.

In FIG. 1 shows the installation of an impeller seal in a transfer gearbox of a power hydraulic pump drive; in Fig.2 - section aa in Fig.1; in FIG. 3 is a view B in FIG. 2.

The impeller seal contains a shaft 1, which is fixed in the rolling bearings 2 and 3. Bearings 2 and 3 are located in the gear housing 4. The impellers 5 and 6 are fixedly mounted on the shaft 1 and are preloaded by spacer bushings 7 and 8. The bushings 7 and 8 are mounted on the shaft 1 without

turning possibilities. In the covers 9 and 10 there are installed sealing elements made in the form of cuffs 11 and 12, which are mounted on the gear housing 4. The impellers 5 and 6 are made in the form of a disk and are made conical with an inclined side of the cone 13 at an angle to the part of the diameter towards the outer contour a, and on the conical surface of the impeller there are made through grooves 14. arranged with an inclination at an angle ft to the frontal plane. The grooves of the 14 impellers 5 and 6 are rectangular. Impellers 5 and 6 are located on the tapered side to cuffs 11 and 12 of the volume being sealed. A gear wheel 15 is rigidly fixed to the shaft 1. The gear wheel 15 is kinematically connected to the gear wheels of the gearbox (gears are not shown in the drawing). In gear housing

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4 is oil. The gear wheel 15 is immersed in an oil bath to a depth of the height of the teeth.

Impeller seal operates as follows.

In the idle state, the shaft 1 is sealed by cups 11 and 12. When the shaft 1 is rotated at a high frequency, the bearings 2 and 3, as well as the mating surfaces of the cups 11 and 12 and the bushings 7 and 8, are lubricated by oil spray and oil mist . Oil sprays and oil mist through the bearing cages 2 and 3 penetrate into the space between the cups 11 and 12 and the impellers 5 and 6, where they settle and condense. When the impellers 5 and 6 rotate, the liquid in space is carried into rotation. As a result, fluid friction forces and inertial rotation forces act on it, preventing the fluid from flowing towards the cuffs 11 and 12. The fluid that rotates from the conical surface 13 and through the grooves 14 of the impellers 5 and 6 is ejected onto the bearings and through the bearing cages 2 and 3 enters the gearbox oil bath. During the rotation of the impellers 5 and 6, the inclined slots 14 exclude the accumulation of a large volume of liquid, while maintaining a lubricant film between the mating surfaces of the cuffs 11 and 12 and the bushings 7 and 8 and the conical surface of the impellers 5 and 6. Oil on the film by inertial forces ott protrudes from the cuffs 11 and 12 along the conical surface of the impellers 5 and 6.

In this way, the rotating impellers 5 and o exhaust the accumulated liquid from the cavities between the cuffs 11 and 12 and the impellers 5 and 6 into the gearbox and prevent fluid leakage through the gaps

between the cups 11 and 12 and the bushings 7 and 8, which are formed as a result of the beating of the shaft 1. In addition, the impellers 5 and 6 in this design perform the functions of an oil separator, limiting the intensive filling of the space between the cups 11 and 12 and the bearings 2 and 3 with liquid. The use of impeller seals improves the life of the seals.

As a result, the sealing reliability of high frequency rotating shafts is improved. This reduces the overhaul cycle of the gearboxes associated with replacing the shaft seals. In addition, by eliminating oil leakage on the shaft, oil is saved and the maintenance effort of the gearboxes associated with oil refilling is reduced.

Claims (3)

The claims 1, Impeller seal of a rotating shaft fixed to. bearing bearings of the gearbox housing, comprising an impeller fixed in the form of a disk mounted on the shaft and a sealing element located in the cover, characterized in that the impeller is conical on a part of the diameter in the direction to the outer contour with the conical part in the direction from compacted volume, moreover, through the grooves are made through grooves located with an inclination to the frontal plane. 2. The seal according to claim 1, which is identical to the fact that the grooves of the impeller are rectangular. 3. The seal according to claim 1, characterized in that the impeller is located in the conical part towards the sealing element. fa. Compiled by A. Shmelev Tehred M. Morgenthal Figure 3 Proofreader M. Petrova Editor L. Volkova Order 1152 Mintage Subscription VNIIIPI of the State Committee for Inventions and Discoveries under the USSR SCST 113035, Moscow. Zh-35, Rauska embankment. 4/5 Figure 3 Proofreader M. Petrova