SU1416875A1 - Bench for testing valve rotating mechanism of internal combustion engine - Google Patents

Abstract

The invention makes it possible to increase the accuracy of tests by increasing their reliability. The clamping mechanism 3 is made in the form of a wedge located in the guides and the ram, the stem of which is connected to the wedge end plane. Wedge with its inclined surface

Description

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with a roller 10 mounted on the end of the rod 6 rotatably on the axis 11 and preloaded spring 14. The loading mechanism 4 comprises sequentially coaxial valve simulator 18 located in sleeve 19 with the possibility of reciprocating movement, saddle simulator 20, spring 21 , the disk 22, rigidly fixed on the upper end of the push 6875

bodies 23. At the lower end of the pusher 23 there is a mandrel 24 in contact with the valve rotation mechanism 25, centering and locking the cone 26. The upper end of the simulator 18 contacts with one arm of the rocker arm 28, the other arm through the rod 30 and the plunger 31 contacts with the cam shaft 33, simulating a pulsating load. 2 Il.

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The invention relates to mechanical engineering, in particular to devices for testing the operability of the mechanism for rotating the valve of an internal combustion engine.

The purpose of the invention is to increase accuracy by increasing the reliability of tests.

FIG. 1 shows the general layout of the stand; in fig. 2 shows view A in FIG.

The stand includes a body 1 and placed on it a table 2, a clamping mechanism 3 and a loading mechanism 4 with g; drive 5. Table 2 consists of a stem 6 placed in a sleeve 7, having the possibility of vertical movement, limited by a screw 8.

At the upper end of the table 2 there is a nozzle 9. At the lower end of the rod 6 is placed a roller 10 mounted rotatably on the axis 11. Between the collar 12 of the rod 6 and the collar 13 of the sleeve 7 there is a spring 14, which ensures constant contact of the roller 10 with the clamping mechanism 3 which contains a wedge 15 located in the guides 16 and the power cylinder 17, the stem of which is connected to the wedge 15 "

The loading mechanism 4 comprises successively coaxially located above the table 2 a valve simulator 18 placed with the possibility of reciprocating motion in a sleeve 19 located in the body 1 of the stand, a saddle simulator 20 placed also in the body 1 of the stand. Through the spring 21, the valve simulator 18 rests on a disk 22 rigidly mounted on the upper end of the pusher 23 on the lower

the end of which is the mandrel 24, in contact with the mechanism 25 of the rotation of the valve, and the cone 26, which serves to center and fix the mechanism

ma 25 rotations during testing. The pusher 26 is placed with the possibility of reciprocating motion. The restrictive sleeve 27 is placed between the disk 22 and the housing 1.

0 The upper end of the valve simulator 18 is in contact with one arm of the rocker arm 28, fixed with the possibility of swing on the axis 29. Another arm of the rocker arm 28 through the rod 30 and the pusher

5 31 is in contact with the cam 32 of the camshaft 33 simulating the camshaft of the engine. The cam shaft 33 is rotated at the required frequency with the help of water.

The stand works in the following way. In the initial position, the table 2 is in the lower position. When turning on the drive 5, the cam shaft 33

is driven into rotation. The pulsating load from the cam 32 through the pusher 31, the rod 30 and the rocker 28 acts on the upper end of the valve simulator 18, which through the spring 21 acts on the disk 22 of the pusher 23 with the same frequency. The latter, when the table 2 is in the position where the valve rotation mechanism 25 missing on it

5 remains fixed as the disk

22 bottom surface pressed to the fire. Reducer Sleeve 27.

When testing the mechanism 25; rotation valve fur 0

313 boot loading (not shown) is applied to table 2 and the command to turn on the power cylinder 17 is given,

as a result, the wedge 15 is shifted by the current of the cylinder 17, causing the roller 10 of the table 2 to move along an inclined plane with access to the horizontal plane of the wedge 15, raise the table 2 and press the rotation mechanism 25 to the loading mechanism 4. The rotation mechanism 25 is centered by the cone 26 of the pusher 23 and, resting the lid on the mandrel 24, lifts the pusher 23 upward, compressing the disk 22 from the limiting sleeve 27 and compressing the additional spring 21, bringing its force to the required value.

The pulsating load from the valve simulator 18 through the spring 21 and the pusher 23 is transmitted to the valve rotation mechanism 25, causing it to turn, pulling the pusher 23, the spring 21 and the valve simulator 18 behind.

After completion of the test, the piston of the power cylinder 17 makes the return ode and table 2 under the action of the weight and the spring 14 lowers along the inclined plane of the wedge 15 to its original position on the horizontal plane of the wedge 15. Under the action of the spring 21, the disk 22 of the pusher 23 is lowered onto the restrictive sleeve 27, which receives a pulsi load in between test periods.

With the table 2 lowered by a loading mechanism (not shown), the tested valve is removed and the next valve rotation mechanism 25 is fed, the test cycle is repeated.

Due to the maximum imitation of the shape, size, material of the mechanism 4 loading parts of the engine valve mechanism of their respective location, the forces of friction in these mechanisms are very close in magnitude, therefore the moment of resistance to rotation of the mechanism 25 of rotation of the valve is close to the moment of resistance of the valve mechanism on the engine.

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which makes testing on the stand more reliable. The positioning of the valve rotation mechanism 25 on a rigid base consisting of table 2, wedge 15 and stand body 1 simulates its similar arrangement on the head of the engine block. Application of a pulsating load from the side of the mechanism’s mechanism 25

valve rotation is similar to load-. valve mechanism on the engine. All this brings the conditions of the test at the stand to real conditions.

5 work and increases the reliability of the tests.

Claims (1)

Invention Stand for Testing Mechanism 0 rotation of the valve of an internal combustion engine, comprising a body of a clamping mechanism with a ram and a loading mechanism associated with a source of pulsating load, 5 characterized in that, in order to increase the accuracy by reliability of the tests, the clamping mechanism is made in the form of a wedge and rod with a roller fixed in it, with the wedge on the end plane connected to the power cylinder, resting on the body and the inclined plane in contact with the roller, and the stem is housed in a housing with 5 with a reciprocating movement in a vertical plane, the loading mechanism is provided with a valve and seat simulator, a spring and a rod containing, at one end, a mandrel for 0 accommodating the rotation mechanism, and on the other - a disk, the spring being placed between the rod disk and the valve simulator, and the valve simulator, the rubber and the rod are installed sequentially 5 coaxially with the rod and the rod contacts the rod through the rotation mechanism; engine and contains a 0 The cam shaft, the plunger, the rod and the rocker in contact with each other are in contact with the valve simulator. pup.2