CN215640083U

CN215640083U - Crankshaft flange torsional fatigue detection device

Info

Publication number: CN215640083U
Application number: CN202121681374.6U
Authority: CN
Inventors: 孙军; 倪培相
Original assignee: Tianrun Industrial Technology Co ltd; Shandong University
Current assignee: Tianrun Industrial Technology Co ltd; Shandong University
Priority date: 2021-07-23
Filing date: 2021-07-23
Publication date: 2022-01-25
Anticipated expiration: 2031-07-23

Abstract

The utility model relates to a crankshaft flange torsional fatigue detection device, which solves the technical problems that the torsional fatigue strength of a crankshaft flange cannot be completely inspected and the function of a crankshaft flange torsional fatigue test cannot be realized in the conventional device, and is provided with an excitation arm, a drum-shaped disc, an outer jacket and an inner jacket; the drum-shaped disc is a round drum-shaped piece with threaded holes on the inner ring and the outer ring and an outward bulge in the middle; the drum-shaped disc is connected with the excitation arm. The utility model can be used in the field of crankshaft flange detection.

Description

Crankshaft flange torsional fatigue detection device

Technical Field

The utility model relates to a fatigue detection device, in particular to a crankshaft flange torsion fatigue detection device.

Background

The crankshaft is one of the most important parts in the engine, and the strength of the crankshaft is directly related to the reliability of the whole engine, so that strength test verification is required. Fatigue testing is the primary means of crankshaft strength verification. The flange at the rear end of the crankshaft is connected with an engine flywheel, is a power output part of the engine and bears larger torsional moment in the running process of the engine. The flange part at the rear end of the crankshaft is not a direct stress impact part in the working process of the engine due to the special structure, and the fatigue strength of the flange part is not detected usually. In recent years, with the increasing explosion pressure and power density of engines, the probability of crankshaft torsional failure is higher and higher, and particularly, the rear end flange part of the crankshaft fails. Therefore, it is more important to detect the torsional fatigue strength of the crankshaft rear end flange.

The crankshaft fatigue test is usually carried out in a single crank mode, namely, a section of crank throw sample is cut from the whole crankshaft for detection. The traditional crankshaft fatigue test method is that test fixtures are utilized to clamp journals at two sides of a test crank throw, and then test equipment is used to apply load to a certain point of the fixtures to test the fatigue strength of a crankshaft. However, the flange part at the rear end of the crankshaft has a special structure, and a fatigue test cannot be carried out without a corresponding test device.

The utility model discloses a chinese utility model patent that publication number is CN201016901Y discloses a flywheel bolt fatigue test anchor clamps, it is by the flywheel, the flywheel flange, the bent axle, the flywheel fixing base, the flywheel ring gear, the bolt, the equipment base, bent axle thermal flange and equipment actuator constitute, the flywheel is in the same place with the flywheel flange mounting, the flywheel flange is installed with the bent axle cooperation, the tip bolt passes through the flywheel fixing base and installs in the same place with the cooperation of flywheel ring gear, the flywheel fixing base links together with the equipment base, the main shaft footpath and the bent axle thermal flange cooperation of the other end of axle are installed in the same place, bent axle thermal flange is connected with the equipment actuator.

When the device is used for detecting the torsional fatigue of the crankshaft flange, the following problems mainly exist:

(1) when the device is used for testing, a flywheel needs to be installed, so that the testing cost and the difficulty of testing operation are increased;

(2) the possibility of failure of parts such as a flywheel gear ring, a flywheel bolt and the like exists in the test process, the torsional fatigue strength of the crankshaft flange cannot be completely inspected, and the function of the torsional fatigue test of the crankshaft flange is not realized.

Disclosure of Invention

The utility model aims to solve the technical problems that the torsional fatigue strength of a crankshaft flange cannot be completely inspected and the torsional fatigue test function of the crankshaft flange cannot be realized in the conventional device, and provides a torsional fatigue detection device for the crankshaft flange, which can perform the torsional fatigue test of the crankshaft flange part and can completely reflect the torsional fatigue strength of the crankshaft flange part in the test result.

Therefore, the utility model provides a crankshaft flange torsion fatigue detection device which is provided with an excitation arm, a drum-shaped disc, an outer jacket and an inner jacket; the drum-shaped disc is a round drum-shaped piece with threaded holes on the inner ring and the outer ring and an outward bulge in the middle; the drum-shaped disc is connected with the excitation arm.

Preferably, the drum-shaped disc is provided with an outer ring, and the outer ring is connected with the excitation arm through a bolt.

Preferably, the excitation arm is provided with a through hole, the outer jacket and the through hole are in interference fit and connected into a whole, the inner wall of the outer jacket is provided with a taper, and one side end face of the outer jacket is provided with a bolt through hole.

Preferably, the outer diameter of the inner jacket has a taper, the outer diameter of the inner jacket is larger than the inner diameter of the outer jacket, the inner jacket is provided with an open slot and a bolt hole, and the bolt through hole of the outer jacket is connected with the bolt hole of the inner jacket through a fastening bolt.

The utility model has the following beneficial effects:

the device provided by the utility model ensures that the clamping mode of the crankshaft flange sample is the same as the connecting mode of the crankshaft flange end in the engine, can simulate the stress condition of the engine on the crankshaft flange, and completely reflects the torsional fatigue strength of the crankshaft flange; stable and simple structure, and easy assembly and disassembly.

In particular, the first and second (c) substrates,

(1) the drum-shaped disc is a circular drum-shaped piece which is provided with an inner ring threaded hole, an outer ring threaded hole and a middle part which protrudes outwards. Firstly, the drum shape has high strength, and the drum shape cannot fail in advance during testing; secondly, the drum shape increases the connection space between the drum shape and the crankshaft journal, so that the bolt assembly is facilitated; thirdly, the weight of the connecting piece can be effectively reduced, and the assembly and disassembly operation is convenient.

(2) The excitation arm is provided with a through hole, the outer jacket and the through hole are in interference fit and connected into a whole, the inner wall of the outer jacket is provided with a certain taper, and bolt through holes are uniformly distributed on the end surface of one side of the outer jacket. The assembly structure is simple, the outer jacket is in interference connection with the excitation arm, and repeated assembly and disassembly during testing are avoided; the inner wall of the outer jacket is provided with a certain taper, so that the fit area is large enough when the outer jacket is matched with the inner jacket.

(3) The outer diameter of the inner clamping sleeve is provided with a taper, the outer diameter of the inner clamping sleeve is slightly larger than the inner diameter of the outer clamping sleeve, the inner clamping sleeve is provided with an open slot and a bolt hole, and the bolt through hole of the outer clamping sleeve is connected with the bolt hole of the inner clamping sleeve through a fastening bolt. The assembly structure has high tension force, and can ensure that a large test load is loaded without loosening a test piece; the inner clamping sleeve is provided with an open slot, the requirement on the dimensional tolerance of the crankshaft journal is relatively loose, the size tolerance of +/-1 mm can be applied, and the applicability is strong.

Drawings

FIG. 1 is an assembly schematic view of a crankshaft flange torsional fatigue detection apparatus of the present invention;

FIG. 2a is a schematic diagram of an outer jacket; FIG. 2b is a cross-sectional view A-A of FIG. 2 a;

FIG. 3a is a diagram of a drum; FIG. 3B is a cross-sectional view B-B of FIG. 3 a;

FIG. 4a is a schematic view of an inner jacket; fig. 4b is a cross-sectional view C-C of fig. 4 a.

The symbols in the drawings illustrate that: 1. an excitation arm; 2. a drum-shaped disc; 3. an outer jacket; 4. an inner jacket; 5. fastening a bolt; 6. and (4) testing the flange.

Detailed Description

The present invention will be further described with reference to the following examples.

As shown in fig. 1, the present invention provides a crankshaft flange torsional fatigue detecting apparatus, which comprises a pair of excitation arms 1, a drum 2, an outer jacket 3 and an inner jacket 4.

As shown in fig. 2a and 2b, the outer jacket 3 is connected with the through hole on the excitation arm 1 in an interference fit manner, the inner wall of the outer jacket 3 has a certain taper, bolt through holes are uniformly distributed on the end surface of one side, and bolts can penetrate through the through holes and be screwed into the inner jacket 4.

As shown in fig. 3a and 3b, the drum-shaped disc 2 is a circular drum-shaped member with inner and outer ring threaded holes and a middle part protruding outwards, the pitch circle of the inner ring threaded hole is consistent with the pitch circle of the bolt hole of the crankshaft flange, the inner ring is connected with the crankshaft flange through a bolt, the outer ring is connected with the excitation arm 1 through a bolt, and after the bolt is tightened, the flange, the drum-shaped disc 2 and the excitation arm 1 are firmly connected into a whole. The connection mode between the drum-shaped disc 2 and the crankshaft flange is the same as that of a crankshaft in an engine, and the stress condition of the crankshaft flange in the engine can be simulated during testing.

As shown in fig. 4a and 4b, the outer diameter of the inner jacket 4 has a taper, the outer diameter of the inner jacket 4 is slightly larger than the inner diameter of the outer jacket 3, the inner diameter of the inner jacket 4 is the same as the size of the crankshaft rear end journal, the inner jacket 4 is provided with an open slot and a bolt hole, a fastening bolt can penetrate through the through hole of the outer jacket 3 and be screwed in the bolt hole of the inner jacket 4, the inner jacket 4 and the outer jacket 3 are tightened and firmly connected into a whole by screwing the bolt, and the inner jacket 3 tightly embraces the crankshaft journal under the extrusion action.

The working process of the utility model is as follows:

first, the end face of the flange sample 6 is fastened to the drum 2 with bolts, the drum faces the sample side, and the outer ring of the drum 2 is fastened to the one-side excitation arm 1 with bolts.

Then, a shaft neck at the tail end of a flange sample 6 is arranged in an inner jacket 4, the inner jacket 4 with the flange sample 6 arranged is arranged in an outer jacket 3 on an excitation arm 1, the outer jacket 3 and the excitation arm 1 are in interference fit into a whole, and a fastening bolt 5 penetrates through a through hole in the side face of the outer jacket 3 and is screwed in a screw hole of the inner jacket 4. Because the contact surfaces of the inner jacket 4 and the outer jacket 3 have certain conicity, after the bolts are screwed down, the tail end journal of the flange sample 6 is fastened on the excitation arm 1 through the tension force of the inner jacket 4 and the outer jacket 3.

After clamping is completed, the flange sample 6, the drum-shaped disc 2, the inner clamping sleeve 4, the outer clamping sleeve 3 and the excitation arm 1 form a fixed whole, and a torsional fatigue test can be performed through a test system.

The test proves that the crankshaft flange torsional fatigue test carried out by the test device of the utility model has the torsional fatigue strength of 4230N.m which is basically consistent with the fatigue strength result (4218N.m) of simulation calculation, and the failure position of the sample is at the bottom of the flange bolt hole and is consistent with the failure position of the flange when the crankshaft runs in the engine.

However, the above description is only exemplary of the present invention, and the scope of the present invention should not be limited thereby, and the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should be covered by the claims of the present invention.

Claims

1. A crankshaft flange torsional fatigue detection device is characterized by being provided with an excitation arm, a drum-shaped disc, an outer jacket and an inner jacket; the drum-shaped disc is a round drum-shaped piece with threaded holes on the inner ring and the outer ring and an outward bulge in the middle; the drum-shaped disc is connected with the excitation arm.

2. The crankshaft flange torsional fatigue detection device of claim 1, wherein the drum-shaped disc is provided with an outer ring, and the outer ring is connected with the excitation arm through a bolt.

3. The crankshaft flange torsional fatigue detection device of claim 1, wherein the excitation arm is provided with a through hole, the outer jacket and the through hole are in interference fit and connected into a whole, the inner wall of the outer jacket is provided with a taper, and one side end face of the outer jacket is provided with a bolt through hole.

4. The crankshaft flange torsional fatigue detection device of claim 1, wherein the outer diameter of the inner jacket has a taper, the outer diameter of the inner jacket is larger than the inner diameter of the outer jacket, the inner jacket is provided with an open slot and a bolt hole, and the bolt through hole of the outer jacket is connected with the bolt hole of the inner jacket through a fastening bolt.