SU1375961A1 - Resonance bed for testing shafts - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to devices for testing shaft strength. The purpose of the invention is to improve the quality of the test shafts by approximating the test conditions to the operational ones by allowing the load to bend by bending to turn the test shaft with its angular setting during loading, which is characteristic of the shafts in the exp. -r I f, s about-th g luatatsii. The bench contains two masses 1, installed on the grounds of an installed base. Shaft (B) - 6 contains two drive shafts with weights 9 eccentrically located with respect to the axis of rotation. Indicator 10 is installed on the test shaft (VI) 5 to measure the deformation of IV 5. A stand for providing an angular installation of the IP 5 when loaded contains a planetary mechanism with central 11 and 12 and intermediate 13 with bevel gears and carrier 14, two intermediate shafts 15 and 16 and a worm gear. The latter consists of a worm gear 17, connected to the central bevel gear 11 of the planetary mechanism, and a screw 18, equipped with a control element 19 for adjusting the rotation of the IV 5 relative to the weights 9 V 6 .. The intermediate shaft 15 is connected to the free end of one of the drive shafts B 6, and the free end of the intermediate shaft 16 is connected with the gear train 20 connected with IV 5. 4 or I 17 IS Vt 1 K i I / II s CO DM D O5 Q / QJI l "" V 2 "to /

Description

The invention relates to mechanical engineering, in particular to devices for testing shaft strength.

A well-known resonant test bench for shafts containing two vertically mounted masses spring-loaded with clamps for fastening the test shaft, a directional vibrator is placed on one of the spring-loaded masses containing two drive shafts eccentrically located with respect to the axis of rotation.

However, the well-known test bench provides the bending stress of the test shaft in one plane only and does not allow to obtain loading by bending with rotation of the test shaft with a change in the angular position of the shaft during loading, which is characteristic of the shafts in operation.

The purpose of the invention is to improve the quality of the test shafts by bringing the test conditions to real operational ones.

FIG. 1 shows a stand, a general view of FIG. 2 is the same, a view of the side-, in FIG. 3 is a view A of FIG. 2, in FIG. 4 shows a section BB in FIG. one.

The stand contains two masses 1 mounted on the base 2 on the springs 3. The masses 1 have clamps 4 for fastening the test shaft 5. On one of the masses 1 is placed a vibrator 6 connected to the engine 7 via a propeller shaft 8. The vibrator 6 contains two drive shaft with eccentrically located weights 9 relative to the axis of rotation. Indicator 10 is mounted on the shaft 5 under test to measure the deformation of shaft 5. The stand for providing angular positioning of shaft 5 with a load contains a planetary mechanism with central 11 and 12 and intermediate 13 conical poles 14 and two intermediate shafts 15 and 16 and a worm gear consisting of a worm gear 17 connected to a central bevel gear 11 of the planetary gear, and a screw 18 fitted with a control member 19 for adjusting the rotation of the test shaft 5 relative to cargo .9 vibrator 6. The intermediate shaft 15 is connected to the free end with one of the drive shafts of the vibrator 6, and the intermediate

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shaft 16 with a free end with a gear 20 associated with the test shaft 5.

The stand works as follows. The test shaft 5 is fastened with clamps 4. The motor 7 drives the shafts with weights 9 of the vibrator 6, the intermediate shaft 15 and the carrier connected to it, 14. The intermediate gear 13 with the planet carrier 14 moves along the stationary central gear 11 and rotates the central gear 12 with the intermediate shaft 16 and the gear train 20 with the test shaft 5. The angular position is adjusted and adjusted by rotating the control member 19 in one direction or another. In this case, the worm 18 turns the worm gear 17 and with it the central bevel gear 11 of the planetary gear. This movement provides additional rotation of the intermediate shaft 16, gear 20 and the test shaft 5 relative to the position of the loads 9 of the vibrator 6. The rotation of the control member 19 is possible both with the stand stopped and the engine 7 operating. The deformation of the shaft 5 is measured by the indicator 10.

In the proposed device, each loading stage is characterized not only by a certain bending moment acting on the shaft under test, but also by its certain angular position, which is changed discretely at the end of a certain load stage when going to the next.

Claims (1)

Invention Formula A resonant test bench for shafts, predominantly crankshafts, containing two spring-loaded masses mounted on the base with clamps for fastening the test shaft, one of which has a directional vibrator, characterized in that, in order to improve the quality of the test shafts by approximating the test conditions to actual operational , the stand is equipped with a planetary mechanism with central and intermediate bevel gears and a carrier, a means of changing the angular position of the shaft during the tests, made in the form of a worm gear, associated one of the central gears of the planetary gear, two intermediate shafts, one of which connects the carrier of the planetary gear with the vibrator drive shaft, and the other the corresponding bevel gear of the planetary gear with the test shaft. Fi2 View A5-5 Fig.} 75 Figm