SU785669A1 - Stand for endurance testing of toothed gear teeth - Google Patents

Description

The invention relates to mechanical engineering, in particular to testing equipment, and can be used in endurance testing of gear teeth.

A stand for testing the endurance of a gear tooth toes, a cOflepKacuia housing, located therein on a sub-shaft shaft, which is designed to mount HcnKiTyeNaax gears, a load lever connected to the shaft, is fixedly mounted in the housing, loading a gear wheel and a back gear.

The disadvantage of this test bench is that during the testing of the endurance of only one tooth, up to 110 hours of continuous operation is expended, since the frequency of loading does not exceed 25 Hz.

The purpose of the invention is to reduce the time of testing.

This is achieved by the fact that the nudgement lever is made 1) -shaped, one shoulder of which is connected with the drive of the reciprocating slide, the stand is equipped with an elastic element connecting the linkage and the other shoulder

lever with casing. The glossiness of the elastic element S. is chosen from the condition:

C.GS

, -2 "W

L mm

{Jl

(s v.)

where Cv is the hardness of the tooth; H - the distance between the axes

elastic element and test wheel tn); ,, J5 Гщ- radius of the initial circle

test wheel 5, liH Н - width, height of cross section and length of the lever arm connected through an elastic element with the body

 shl; the modulus of elasticity of the first rDCH -J;

Crowd of zu§yev loading wheel. located adjacent to the loading tooth, less than the thickness of the latter by 0.3-0.5 mm.

The drawing is a schematic diagram of an endurance test bench for gear teeth.

The proposed 1st booth has a frame 1, which is mounted on the housing of the vibrating unit. On the frame there are two pillars 2, in the latter, the shafts 3 and 4 of the loading; 5 and the test 6 wheels respectively; The shaft 3 is fixedly attached to the posts with 2 pins 7, and the shaft 4 is mounted in stands on the bearings of the swing 8 and attached to it. lever 9.

The constant component force on the upper arm of the U-shaped lever is transmitted by the elastic element 10 when it is compressed. bolt 11 screwed into stand 12.

The variable force on the lower arm of the figurative lever is transmitted by a rod 13 driven by a reciprocating actuator 14.

The bench works as follows: the start of work is carried out by static calibration. For this, the lower arm of the 0-arm is released from the rod 11 and a dynamometer is installed instead of the elastic element 10. Turning the bolt 11, loading the upper arm of the i-arm through the dynamometer, which turns the wheel 6 and loads its tooth with so much more force, how much the lever arm is greater than the ratio. Dius of the initial circumference of the test wheel. At the same time, the magnitude of the force is recorded by the dynamometer, and the oscilloscope is where the signal from, the strain gauge on the tooth is entered, the corresponding deflection of the beam of the loop, and the calibration diagrams are drawn from this data.

At the end of the calibration, instead of the dynamometer, the elastic element 10 is installed, the bolt 11 is pressed until the oscilloscope receives deviations of the loop beam corresponding to the given load, which is checked according to the calibration schedule. Then, the lower arm of the U-shaped lever is attached to the stem, 13. Power is supplied to the actuator 14 and the frequency of the reciprocating movement and the amount of movement of the rod 13 corresponding to the required force is set.

The upper arm of the U-shaped lever 9 yields a static component to the tooth of the wheel 6, and a variable force is transferred from the lower lever of the lever, p sum from the upper and lower shoulders of the U-shaped lever to the tooth of the wheel 6 a variable force is transmitted, which varies on the sign-constant cycle with any asymmetry coefficient.

The proposed stand increases

the frequency of loading the tooth of the test wheel to 125 Hz, which leads to a reduction in the time of endurance testing of the teeth of gear wheels. In addition, it allows testing the teeth when force is applied anywhere along the height of the tooth.

Claims (3)

1. A bench for endurance testing of teeth of gear wheels, comprising a housing, a shaft placed therein on bearings, which is intended for installation of test subjects gears, a shaft-attached loading lever, rigidly fixed in the housing, a loading gear, and a reciprocating drive, which is also distinguished by the fact that, in order to shorten the test time, the loading lever is made (J-shaped, one of which is associated with a reciprocating drive, the stand is equipped with an elastic element,. svyvyyurdam other shoulder lever with the body, 2, the Stand according to claim 1, in connection with the fact that the rigidity of the elastic element C is chosen from the condition: cD fANV 2 4. And v „ where C - "tooth hardness H - the distance between the axes elastic element and test wheel. Hz, is the radius of the initial circumference of the test wheel a, | 1И Н - width, height transverse cross-section and length of the lever arm; svnnaff through an elastic element with body E is the modulus of elasticity of the first kind of 3. Stand 1 and 2, characterized in that it is TolECin. the teeth of the loading wheel, located next to the loading tooth, are less than the thickness of the latter by 0.30.5 f / iM. Sources of information taken into account in the examination 1. Bocharov G.S. Installation for bending test of gear teeth, - Vestnik Mashinostroenie, 1958, № 10, p. 18 (prototype). 6,