SU1350522A1 - Bed for testing chain transmissions - Google Patents

Abstract

The invention relates to the field of engineering, in particular to testing equipment, and can be used for bench testing of chain drives. The purpose of the invention is to expand the range of test loads and increase productivity. The circuits are tested in a power-closure mode with a static load carried out by turning it towards -. , water sprockets with a constant torque, caused by the sliding of loads 35 in curved slots 30, 31 of the disks 28. The stand can operate in both direct 4 load mode and closed power loop mode with cyclic or pulsating load. 1 hp f-ly, 7 ill. Jff o & (L 35 oo JV about sd 1C 31 Fig. 6

Description

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The invention relates to mechanical engineering, in particular to testing equipment, and can be used for stevda testing of chain transmissions.

The purpose of the invention is to expand the range of test loads, increase productivity by automatically compensating for chain stretches during testing, approximating test conditions to actual operating conditions.

Figure 1 shows the stand, a general view; FIG. 2 is a section A-A in FIG. on fig.Z - section BB in figure 1; figure 4 is a section on fig.Z; FIG. 3 is a fragment of the mount node of the driven sprocket. 2; figure 6 - section GG on fig.Z; Fig. 7 is a diagram of the fastening of centrifugal weights on the telescopic shaft of drive sprockets.

A device for testing drive chains contains a frame 1 on which a drive of rotation 2 is fixed, a device 3 for supplying suspensions to test chains 4, protective covers 5 with hinged covers 6, a drive 7 for displacing the node 8 of the star-driven followers. check 9 with screws 10. The node 8 of the driven sprockets 9 is moved by means of the bearings 11 in the guides of the bed 1. The drive 12 of rotation of the housing is fixed to the housing 13 and connected with the pulley 14 of the V-belt drive 15.

Case 13, made with eccentric; The inner surface of the hole and placed in the supports 11 of the quality 40 contains an eccentric sleeve 16 in which a shaft 18 is placed on the supports 1 of the roller, carrying the sprockets 9, fastened with nuts 19 and pressed to the spacers 20. Screws 10 The movements of the node 8 of the driven sprockets 9 interact with the nuts 21. The node of the driving sprockets is assembled on brackets 22 fixed on frame i and carries in a rolling support 23 a telescopic shaft consisting of the covering part 24 and the internal part 25, contact-; steaming with each other through props 26

13505222

the curved grooves 30, and the disc 29 has curved grooves 31. In the curved grooves 30 and 31 are inserted centrifugal weights in contact with the grooves of the rolling supports 32. The centrifugal load consists of a sleeve 33 with a rod 34 inserted into it, on which smoked weights 35 and two romes 36 are mounted. Two plates 37 and plates 38 connected in pairs by springs 39 are mounted on the rod 34. The disks 28 and 29 have holes in which rods 40 should be inserted. Non-contact limit switches 41 and 42 are fixed on frame 1. Parts 24 and 25 of the drive shaft carry sprockets 43 fixed by nuts 44 "Between the driven sprockets 9 (figure 5) and housing 13 can be installed cam clutches 45.

The stand works in a shorter way.

Test subjects 4 chains put on driven sprockets 9 and driving sprockets 43. Static load is created by turning one drive sprocket 43 relative to the other by centrifugal forces with constant torque from loads 35. Static load is complemented by a cyclic with a constant pulsation period, carried out by eccentric rotation shaft of driven sprockets 9. To determine the effect of mounting points

35

jia's performance problems the transmission of the test is done with a mix of

drive planes and driven stars.

Calculate the mass of replaceable goods 35 taking into account the necessary tensile static loads in the chains. In comparative tests with pulsating load of the tested circuits

g stiffness should differ by no more than 5%. The 1st beat of the pulsating component of the load, the length of the chain and its rigidity determine the necessary beating of the shaft 18 of the driven sprockets 9

gQ and establish eccentricity between

details 13 and 16, turning them relative to each other, equal to half of the required beats of the driven shaft 18. The magnitude of the eccentricity of the pre- and 27 rolling. The shaft part 24 is marked on the outer V-belt diagonal connected with an example 16, which has slots for water 2. The parts 24 and 25 of the telescopic capability of their turn of the relative shaft carry the disks 28 and 13 what between half and 29 respectively. The disks 28 have the bodies 13 by us;

Test subjects 4 chains put on driven sprockets 9 and driving sprockets 43. Static load is created by turning one drive sprocket 43 relative to the other by centrifugal forces with constant torque from loads 35. Static load is complemented by a cyclic with a constant pulsation period, carried out by eccentric rotation shaft of driven sprockets 9. To determine the effect of mounting po5

jia's performance problems the transmission of the test is done with a mix of

drive planes and driven stars.

Calculate the mass of replaceable goods 35 taking into account the necessary tensile static loads in the chains. In comparative tests with pulsating load of the tested circuits

g stiffness should differ by no more than 5%. The 1st beat of the pulsating component of the load, the length of the chain and its rigidity determine the necessary beating of the shaft 18 of the driven sprockets 9

Q and establish the eccentricity between

parts 13 and 16 turn them relative to each other, equal to half the required beating of the driven shaft 18. The eccentricity value is preliminarily marked on the outer diameter 16, having grooves for the possibility of their turn relative to the body 13, between which half Corps 13, provided for 3L3

cf. After installing the eccentricity of the half body 13 stopper vehicle. The drive 7 removes the excess sagging of the chains 4. The centrifugal weights 35 are kept at the minimum distance from the axis of rotation of the drive shaft by the extended springs 39. Turn on the drives 2 and 12, starting the test. Simultaneously with turning on the rotation of the drive shaft, the counter of the number of its turns (not shown) is turned on. When the drive shaft is rotated, the weights 35 move away from the rotation axis and,: moving along the curvilinear grooves 30 and 31 of the disks 28 and 29, the last ones are unrolled (the rods 40 are removed), and consequently, the sprockets 43 are also unrolled chains 4), i.e. The chains 4 will be extended in consideration of the masses of the weights, their position and the frequency of rotation of the drive shaft with the calculated static load. The actuator 12 rotates the housing 13 and the shaft 18 rotatably placed therein receives a beat corresponding to twice the calculated eccentricity between the housing 13 and the inner surface of the sleeve 16, which will result in a pulsating component of the load in the test chains 4. Chain 4 during the test are pulled out, which means the centrifugal weights 35 move away from the axis of rotation of the shaft, which leads to an increase in the torque that unwraps the disks 28 and 29, and hence the drive sprockets 43 relative to each other, as a result of which the age la would load chains 4. To avoid this and tests occurred at stable load, chains 4, the slots 30 and 31 are curved and in opposite CTopony deployed in adjacent upstanding disks.

The angle of inclination of the longitudinal axis of the curvilinear groove at each point is determined by the dependence D Z

where o / is the angle between the longitudinal axis of the groove at a given point and the radius of the disk passing through this point, and R is the distance of the centrifugal weight from the axis of rotation.

In order to eliminate the effect of inaccuracies in the manufacture of grooves 30 and 31, it is desirable that the tests take place at a constant position of the weights 35

15 20 25 h o g

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relative to the axis of rotation of the shaft. This is ensured by the fact that the loads 35 are carrying days on themselves rmo 36, which, when the load 35 is removed from the axis of rotation, interact with the contactless limit switch 41 and the signal of the latter activates the drive 7, which with the help of screws 10 moves the node 8 of the driven sprockets 9 to until the centrifugal weights 35 are returned to their original position and the signal from the switch 42 disappears. This process occurs as the chain is pulled repeatedly. If one of the chains is broken, then the loads 35 will reach the end of the grooves 30 and 31 and the length 36 through the conical switch 42 will command the termination of the tests. The weights 35 must be at the same distance from the axis of rotation, this is ensured by the belt 36 and the plates 37. After the shaft stops, the loads 35 return to their original position by the springs 39 by means of the plates 38. .

When tested in the direct loading mode of the test circuit 4, the disks 28 and 29 are kept from turning by the rods 40, the load in the circuit is created by the drive-12, which operates in the generator mode. In this case, a cam clutch 45 must be inserted between the sprocket 9 and the housing 13. The load on the circuit may also have a pulsating component.

To determine the VL and not on the operability of the circuit of errors of installation and the establishment of the permissible error. The bones can be tested with the displacement of the planes of the drive sprockets, for which the length of the spacer sleeve 20 is chosen such that the planes of the drive sprocket 43 and the driven sprocket 9 are displaced.

The bench for testing drive chains can operate in a closed power loop mode (two identical gears are tested simultaneously or comparative tests are carried out on the performance of different gears with the same loads in the chains) and in direct load mode (one gear is tested). During the work in the mode of the closed power

test circuits can be carried out under constant and pulsating loads.

Claims (2)

Invention Formula i.Stand for testing chain drives, containing a frame, placed on the frame of a pair of drive and driven sprockets connected to shafts for placing chains, a device for static and a device for cyclic loading, characterized in that, in order to expand the range of test loads and increase performance, the device for cyclic loading is made in the form of an eccentric bushing installed inside the shaft of the driven sprockets, having an internal surface with an eccentricity equal to the eccentric sleeve quality, and the device for static loading made in the form of disks with radial curvilinear grooves, the shaft of the drive sprockets is made telescopic, the disks are placed on its inner and female parts, with the angle of inclination of the longitudinal axis of the curvilinear groove at each point defined is it where c / five addiction  P 0 the angle between the longitudinal axis of the groove at a given point and the radius of the disk through this point; R is the distance of the centrifugal load from the axis of rotation, and the grooves of two adjacent disks are turned in opposite directions. 2. Stand POP.1, which is distinguished by the fact that it is equipped with an additional screw drive and a limit switch, kinematically connected with the said drive. 20 w  I / 1 bJ l T and E / 1 bJ l T V t / y 97i / e. J in-in l V (rig, 5 FIG. 7 Editor S.Patrusheva Compiled by E. Tokmakova Tehred L. Oliynyk Proofreader G. Reshetnik Order 5277/41 Circulation 776 Subscription VNII1Sh State Committee of the USSR on affairs of inventions and discoveries 113035, Moscow,, Raushsk eab., 4/5 Production and printing company, Uzhgorod, st. Project, 4