KR100892504B1 - Fatigue test apparatus of engine block - Google Patents

Abstract

The present invention relates to a fatigue test apparatus for an engine block, wherein the direction of fatigue load applied to the engine block is reproduced in a test equipment, and the durability of the engine block is evaluated, thereby assembling and operating an actual engine during development or evaluation of a conventional engine block. The purpose is to save time and money by eliminating the need to make the process, and to identify the cause of damage efficiently.

The object of the present invention is that the inclined jig is fixed to the magnetic resonance fatigue tester, the engine block is mounted in the inclined direction to the inclined jig so that the bulk head of the engine block is coupled with the load transfer jig by the crank pin, and the crank pin by the oil supply unit By supplying oil between the bulkhead portions, the fatigue of the engine block bulkhead portion is achieved by providing a fatigue testing apparatus for the engine block to be tested.

Engine block, bulkhead, fatigue test, warp jig, crank pin, oil supply

Description

Fatigue test device for engine block {FATIGUE TEST APPARATUS OF ENGINE BLOCK}

1 is a start view of a conventional engine block fatigue test apparatus,

2 is a view illustrating a fatigue test apparatus for an engine block according to the present invention;

Figure 3 is a perspective view of the jig of the fatigue test apparatus of the engine block according to the present invention,

4a and 4b is a tilt jig reflection of the fatigue test apparatus of the engine block according to the present invention,

5 is a structural start view of the load transfer jig of the fatigue test apparatus of the engine block according to the present invention,

6 is a cross-sectional view of the crank pin of the fatigue test apparatus of the engine block according to the present invention,

7a and 7b is a position view of the crank pin of the fatigue test apparatus of the engine block according to the present invention,

8A and 8B show a comparison of engine block breakage.

<Description of the symbols for the main parts of the drawings>

200: tester 210: inclined jig

230: Load transfer jig 240: Crank pin

250: oil supply unit 310: mounting hole

400: oil hole 410: spray hole

The present invention relates to a fatigue testing apparatus for an engine block, and more particularly, to a fatigue testing apparatus for an engine block in which the direction of fatigue load applied to the engine block is reproduced in a test equipment and the durability of the engine block is evaluated.

In general, automotive engines are increasingly required for high output and light weight, and structural rigidity, new materials, and new construction methods are increasing. However, efficient evaluation methods for verifying and supplementing them have not been established.

Until now, the method of evaluating the durability of the engine block against piston explosion load and vibration while driving the engine has been the most basic method of evaluating the durability of the entire engine by assembling and operating the actual engine. There is a problem of time and money incurred, and there is a lot of difficulty in analyzing the cause of the problem.

On the other hand, as a test method for evaluating the engine block parts, techniques that artificially apply hydraulic pressure to the combustion chamber and indirectly transfer this force to the bulk head are used by automobile companies and foreign engine design firms, but operating equipment, efficiency and There is a limit to accuracy.

1 is a view illustrating a conventional engine block fatigue test apparatus.

Hydraulic single-piece fatigue testing equipment used in the prior art as shown in Figure 1 by periodically adjusting the hydraulic pressure generated in the hydraulic tank 100 and the pump 110 by the valve 120, repeated fatigue throughout the engine block 130 In reproducing the load, the hydraulic pressure transmitted to the combustion chamber is indirectly transmitted to the lower part of the engine block and the bulkhead through the piston 140.

Here, since the combustion chamber is formed in an isolated structure using a gasket and a piston, the oil pressure supplied from the oil pump can be converted into a load.

The conventional measuring method is to install the entire engine block in such a hydraulic engine block fatigue test apparatus, add a hydraulic pressure similar to the combustion pressure, give a repeated fatigue load of 10,000,000 cycles, and if it is not damaged, it is recognized as infinite life, but gradually the load It is a method to presume and verify the maximum fatigue limit by applying 1,000,000 cycle repeated fatigue load and checking whether it breaks.

Thus, the conventional engine block fatigue test apparatus and method has a problem that the apparatus is complicated, difficult to control the magnitude and direction of the force reproduced in the bulk head portion, and the evaluation time is long due to the characteristics of the hydraulic equipment.

Therefore, the present invention has been invented to solve the above problems, the inclined jig is fixed to the magnetic resonance fatigue tester, the engine block is mounted in the inclined direction to the inclined jig so that the bulk head of the engine block and the load transfer jig by the crank pin By combining and supplying oil between the crank pin and the bulkhead part by the oil supply part, the direction of fatigue load applied to the engine block is reproduced in the test equipment, and the durability of the engine block is evaluated.

In order to achieve the above object, the present invention provides a fatigue test apparatus for an engine block using a magnetic resonance tester, comprising: an inclined jig in which a mounting portion having an inclined shape is formed in the center so that the engine block is fixed in an inclined direction; A load transfer jig formed on an upper portion of the bulk head portion so that the load is directly transmitted to the bulk head portion of the engine block fixed to the inclined jig; A crank pin coupled to the side of the load transfer jig so that the load transfer jig and the bulk head portion are fastened; It is characterized by consisting of an oil supply unit connected to the supply line to the crank pin so that oil is supplied to the crank pin.

In a preferred embodiment, the inclined jig is characterized in that it is mounted to the ground resonance tester.

In another preferred embodiment, the mounting portion of the inclined jig is characterized in that a plurality of through holes are formed so that the engine block is mounted.

In another preferred embodiment, the crank pin is characterized in that the oil hole is formed at both ends.

As another preferred embodiment, the crank pin is characterized in that the injection hole is formed in the center.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a view illustrating a fatigue test apparatus for an engine block according to the present invention.

As shown in FIG. 2, the fatigue test apparatus of the engine block according to the present invention uses magnetic resonance, and the engine block 220 is fixed by the inclined jig 210 mounted to the tester 200, and the load transmission jig The load is transmitted by the 230 and the crank pin 240, a lubricating film is formed between the crank pin 240 and the bulkhead 450 of the engine block 220 by the oil supply unit 250.

Here, the fatigue test apparatus using the magnetic resonance is subjected to the fatigue test by repeatedly applying a tension-compression stress (tension-compression stress) to the specimen at a constant frequency by generating a magnetic resonance.

3 is a perspective view of the inclination jig of the fatigue test apparatus of the engine block according to the present invention, Figures 4a and 4b is a reflection of the inclination jig of the fatigue test apparatus of the engine block according to the present invention.

As shown in FIG. 3, the inclined jig 210 has a plurality of through holes 310 formed to mount the cylinder head of the engine block 220, and the mounting unit 300 on which the engine block 220 is mounted is provided. It is made of an inclined shape.

In addition, the cylinder head mounting surface of the engine block 220 is preferably fixed to the inclined jig 210 by the head bolt.

Here, the main reason for using the inclined jig is to reflect the direction of the force at the piston top dead center, which is an inherent characteristic of the engine.

This is because the direction of force at the top dead center of the piston during actual combustion has a slight inclination angle rather than a perfect straight line due to the characteristic that the piston linear motion is converted to the rotational motion of the crankshaft.

The intrinsic inclination angle at the piston top dead center may be reflected in the inclined jig 210 as intrinsic characteristics according to the engine model. As shown in FIG. 4A, the engine block 220 is horizontally fixed to the tester 200. In this case, the load direction and the bulk head portion 450 constitute only the basic angle A, but as shown in FIG. 4B, the inclination angle of the inclined jig 210 is fixed when the inclined jig 210 is mounted on the tester 200. The angle A + B to which (B) is added is formed.

Therefore, the magnitude and direction of the force appearing in the block bulkhead part 450 during actual engine combustion may be reproduced in a fatigue test by the inclination angle of the inclination jig 210.

5 is a structural start view of a load transfer jig of a fatigue test apparatus for an engine block according to the present invention.

The load transfer jig 230 fastens only one bulkhead portion 450 instead of the entire engine block 220 fixed to the inclined jig 210 and gives a repeated fatigue load.

As such, when only one bulk head portion 450 is fastened, structural rigidity may be evaluated in the same manner.

Here, in the case of a series engine block having a simple structure, it is possible to fasten the load transfer jig 230 and the bulk head part 450 without interfering with the lower structure of the engine block 220 even in a simple straight shape.

However, in the case where the inclination angle is applied to the V-type engine block 220, the engine block substructure and the load transfer jig 230 interfere with each other, so as to avoid such interference, the load transfer is illustrated in FIG. 5. The jig 230 is preferably coupled to the bulk head 450 in an inclined state according to the inclination angle of the bulk head 450.

At this time, the detailed dimensions and the material of the load transfer jig 230 is preferably formed so that the load added during the test is transmitted without loss to the bulk head portion 450, the deformation of the bulk head portion 450 does not occur. .

6 is a cross-sectional view of a crank pin of the fatigue test apparatus of the engine block according to the present invention, and FIGS. 7A and 7B are position views of the crank pin of the fatigue test apparatus of the engine block according to the present invention.

As shown in FIG. 5, the crank pin 240 engages the load transfer jig 230 and the bulk head 450 at the side of the load transfer jig 230.

In addition, as shown in FIG. 6, the crank pin 240 has an oil hole 400 in which oil supplied from the oil supply unit 250 is injected into both end surfaces thereof, and a spray hole in which oil is sprayed at the center thereof. 410 is formed to form an oil lubrication film at the connection with the bulkhead during the test.

Here, the diameter of the crank pin 240 is preferably designed to the sum of the diameter of the crankshaft and the thickness of the main bearing, the length of the crank pin 240 is formed by a width that is coupled to the bulkhead portion 450 It is preferable.

In addition, the crank pin 240 has no gap between the bulk head portion 450 and no oil film is formed between the crank pin 240 and the bulk head lubrication surface when the bulk assembly is made. (450) The evaluation results cannot be obtained because the deformation and stress transmission are disturbed.

On the other hand, as shown in FIG. 7B, when the gap is excessive, stress is concentrated in the bearing cap 420, which causes a problem that the bearing cap 420 is damaged before the bulk head 450 is evaluated.

Therefore, as shown in FIG. 7A, the crank pin 240 maintains a proper distance with the bulk head 450 to transmit the correct stress to the bulk head 450, thereby generating the bulk head 450. This can be assessed from the modified variant.

As shown in FIG. 2, the oil supply unit 250 delivers oil to the crank pin 240 through a supply path 190 connected to the oil supply unit 250.

This is because the oil film is formed on the lubricating surface of the crankshaft and the bulkhead part 450 that rotates during actual engine combustion, and this is to be reflected in the evaluation.

In addition, the oil supply unit 250 is preferably the oil supply is adjusted by the control unit so that the lubrication film between the crank pin 240 and the bulk head portion 450 is maintained.

As seen above, the fatigue test apparatus of the engine block according to the present invention provides the following effects.

First, the magnetic resonance device is used without the need to add hydraulic pressure to the combustion chamber and control it, greatly reducing the test time,

Second, a plurality of bulkheads included in one engine block can be evaluated, respectively, improving test efficiency and cost,

Third, by limiting the test object to the engine block structure and load, other test variables are excluded, so that the noise factor for the evaluation result and the cause of failure can be excluded as much as possible.

Claims (5)

In the fatigue test apparatus of the engine block using a magnetic resonance tester, An inclined jig in which a mounting portion having an inclined shape is formed in the center so that the engine block is fixed in the inclined direction; A load transfer jig formed on an upper portion of the bulk head portion so that the load is directly transmitted to the bulk head portion of the engine block fixed to the inclined jig; A crank pin coupled to the side of the load transfer jig so that the load transfer jig and the bulk head portion are fastened; The fatigue test apparatus of the engine block, characterized in that consisting of an oil supply portion connected to the supply line to the crank pin so that oil is supplied to the crank pin. The fatigue testing apparatus of an engine block according to claim 1, wherein the inclined jig is mounted to the magnetic resonance tester. The fatigue testing apparatus of the engine block according to claim 1, wherein the mounting part of the inclined jig is formed with a plurality of through holes to mount the engine block. The apparatus of claim 1, wherein the crank pin has oil holes formed at both ends thereof. The fatigue test apparatus of claim 4, wherein the crank pin is formed with a spray hole in the center thereof.

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