CN202582884U - Engine valve actuating mechanism valve rock arm load measurement test device - Google Patents

Abstract

The utility model discloses an engine valve actuating mechanism valve rock arm load measurement test device. The device comprises a control cabinet, a motor, an encoder, a belt pulley, a detected valve actuating mechanism, a lubricating oil tank, a strain gauge, a dynamic strain gauge, a data acquisition card, and a host computer. The speed of the motor is controlled by the control cabinet, an output shaft of the motor drives a camshaft in the detected valve actuating mechanism to rotate, a gear end of the camshaft is installed with the encoder, and an output end of the encoder is in signal connection with an input end of the data acquisition card. The strain gauge is attached on a valve end of a valve rock arm of the detected valve actuating mechanism, an output end of the strain gauge is in signal connection with an input end of the dynamic strain gauge, an output end of the dynamic strain gauge is in signal connection with another input end of the data acquisition card, and an output end of the data acquisition card is in signal connection with the host computer. According to the utility model, only a simple test device is needed, through simulating the working state of an engine, the measurement of a load of the rock arm is completed, and an experimental requirement is satisfied.

Description

Engine valve train valve rocker arm load measurement test device

technical field

The utility model belongs to the technical field of engine detection and relates to a load measuring test device for a valve rocker arm of an engine valve mechanism. the

Background technique

The valve rocker arm of the engine valve train is one of the important moving parts in the engine valve train. It is a key component that transmits the motion of the valve train and affects the performance of the valve train. It has a direct impact on the movement force of the valve. Especially with the development of engine technology, the requirements for the valve mechanism are becoming increasingly stringent. The movement and force of the valve rocker arm not only affects the strength and reliability of the rocker arm, but also the research on the force, movement and landing seat of the valve. very important. Therefore, it is necessary to carry out experimental analysis on the load condition of the valve rocker arm. the

At present, there is no unified test standard for the rocker arm load of the engine valve train. Valve acceleration, push rod stress, etc. can be measured through the machine test bench. However, the configuration conditions of the engine test bench are complex, which is not conducive to the realization of the engine parts manufacturers. Moreover, the obtained experimental data of the force of the valve mechanism is not intuitive to the rocker load, and is not accurate under some working conditions. the

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the above-mentioned technologies, and provide a low-cost, high-efficiency, comprehensive and intuitive engine valve rocker arm load test system. the

The utility model adopts the following technical solutions:

Engine valve mechanism rocker arm load test device includes control cabinet, motor, encoder, pulley, tested gas distribution mechanism, lubricating oil tank, strain gauge, dynamic strain gauge, data acquisition card, upper computer, the tested distribution The pneumatic mechanism includes camshaft, valve rocker arm and push rod. the

The speed of the motor is controlled by the control cabinet. The output shaft of the motor drives the camshaft in the tested gas distribution mechanism to rotate through the pulley. An encoder is installed on the gear end of the camshaft, and the output end of the encoder is connected to one of the data acquisition card. Input terminal signal connection; the valve end of the valve rocker arm of the tested gas distribution mechanism is pasted with a strain gauge, and the output terminal of the strain gauge is connected with the input terminal signal of the dynamic strain gauge, and the output terminal of the dynamic strain gauge is connected with the data acquisition card The other input terminal signal connection of the data acquisition card is connected with the upper computer signal; the lubricating oil tank is connected with the inlet and outlet oil ports of the lubricating channel of the measured valve mechanism through oil pipes. the

Compared with the prior art, the beneficial effects of the utility model are:

1. The rocker arm load test device for the engine valve mechanism provided by the utility model can complete the rocker arm load detection by simulating the working environment of the engine. Through the combination of static and dynamic measurement methods, the test can accurately measure the dynamic rocker load, meet the test requirements, and ensure the reliability of the test. the

2. The load test device for the valve rocker arm of the engine valve mechanism provided by the utility model adopts electronic signal test equipment, and the test precision is high, which ensures the test precision. the

3. The valve rocker arm load test device of the engine valve mechanism provided by the utility model collects signals through strain gauges and encoders, and saves data through the host computer. The operation is simple, the continuity is strong, and the test efficiency is improved. the

4. The engine valve mechanism valve rocker arm load test device provided by the utility model does not require a complicated engine test bench, has a simple structure, low test cost, wide applicability, and is convenient for long-term use, and is widely applicable to various auto parts manufacturers , is conducive to the development of the industry. the

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is a schematic diagram of the static test structure of the utility model. the

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described. the

As shown in Figure 1, the rocker arm load test system for engine valve mechanism includes: control cabinet 1, motor 2, encoder 3, pulley 4, valve mechanism under test 5, lubricating oil tank 6, strain gauge 7, and dynamic strain gauge 8. Data acquisition card 9. Host computer 10. the

The tested gas distribution mechanism 5 is connected with the motor 2 through the pulley 4, and the motor 2 drives the gas distribution mechanism 5 to rotate, simulating the engine working condition; the speed of the motor 2 is adjusted by the control cabinet 1, and the speed of the motor 2 is adjusted according to the requirements of the engine test; the encoder 3 Installed on the camshaft gear end of the tested gas distribution mechanism 5 to obtain the gas distribution speed and rotation angle signals; the lubricating oil tank 6 is connected to the inlet and outlet of the lubricating channel of the tested gas distribution mechanism 5 through the oil pipe, and there is a lubricating oil pump in the lubricating oil tank 6, which can be adjusted Lubricating oil supply pressure and flow rate; the strain gauge 7 is pasted on the rocker arm of the valve mechanism under test to obtain the rocker arm strain voltage; the other end of the strain circuit is connected to the dynamic strain gauge 8 to process the strain signal; the encoder 3 and the dynamic strain gauge 8 is connected to the data acquisition card 9, and the collected signal is converted and sent to the host computer 10; the host computer 10 is connected to the data acquisition card 9, and the signal is saved and processed through the data acquisition program. the

As shown in Figure 2, the static test system for the rocker arm load of the engine valve mechanism includes: a camshaft 11, a tappet 12, a push rod 13, a rocker arm 14, a strain gauge 7, a lever 15, a weight 16, and a dynamic strain gauge 8 . the

Camshaft 11, tappet 12, push rod 13, and rocker arm 14 are the installation structure of the tested valve mechanism when no valve is installed; strain gauge 7 is pasted on rocker arm 14 to measure rocker arm strain voltage; dynamic strain gauge 8 Connect to the other end of the strain circuit to read the strain signal; the lever 15 is placed horizontally, one end is placed on the valve end of the rocker arm of the gas distribution mechanism, and the other end is placed with a weight 16, and the rocker arm is loaded by the weight of the weight to deform the rocker arm , the strain gauge produces a corresponding strain voltage. the

The valve rocker arm load test method of the engine valve mechanism of the utility model includes a static calibration test and a dynamic test test. Through the static calibration test, the relationship between the static load of the valve rocker arm and the strain voltage of the rocker arm is obtained. Then, the dynamic rocker load is obtained by converting the dynamic strain voltage of the rocker arm obtained from the dynamic test. In the test, install the strain gage 7 on the rocker arm 14 of the valve, measure the strain voltage of the rocker arm, place the lever 15 horizontally, load the weight 16 on one end, and press the other end on the valve end of the rocker arm 14, change the weight of the rocker arm by changing the weight of the weight 16 14, read the strain voltage of the rocker arm 14 through the dynamic strain gauge 8, and obtain the relationship between the static load of the valve rocker arm and the strain voltage of the rocker arm. Then through the dynamic test strain gauge 7 and the dynamic rocker arm strain data collected by the encoder 3, the dynamic rocker arm load is obtained. The test steps are:

Step 1. In the static test stage, two groups of valve rocker arms are selected as the working circuit and the compensation circuit respectively. Stick the strain gage on the valve end of the rocker arm, and then install the rocker arm back into the gas distribution mechanism without installing the valve; connect the valve rocker arm strain circuit to the dynamic strain gauge, and connect the detection circuit; select the lever, weigh and record, Put one end of the lever against the valve end of the rocker arm of the intake valve, and place a weight in the air at the other end. the

Step 2. Record and record the readings of the dynamic strain gauge; load 1 kg of weight on the lever for 20 times, after each loading, record the total mass loaded and the readings of the dynamic strain gauge. After the loading is completed, the weights are unloaded one by one, and the total loaded mass and the readings of the dynamic strain gauge are recorded. the

Step 3. Save the recorded data, and obtain the relationship K between the rocker arm valve thrust and the rocker arm strain voltage by the least square method,

$\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; mg</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; l</span>}}{\mathrm{<span\; class="notranslate">\; V</span>}}$

Among them, V represents the strain voltage of the rocker arm, m represents the total mass loaded, g represents the acceleration of gravity, and l represents the leverage ratio. the

Step 4. In the dynamic test stage, the valve train under test is assembled and fixed, and the camshaft gear is connected with the motor gear through a belt. The encoder is fixed on the gear end of the camshaft, and the encoder and the data output line of the dynamic strain gauge are connected to the data acquisition card, and finally connected to the host computer. Turn on the oil pump of the lubricating oil tank, and after the valve mechanism is completely lubricated, turn on the motor to run at a low speed, detect the data signals of each working circuit, and turn off after adjustment. the

Step 5. Turn on the power of each instrument, clear the dynamic strain gauge, turn on the lubricating oil pump, adjust the oil supply pressure to the rated lubricating oil pressure of the air distribution mechanism, and turn on the motor after complete lubrication. Adjust the speed of the gas distribution mechanism to the measured speed of the gas distribution mechanism. After the speed is stable, record the gain of the dynamic strain gauge and the amplification factor of the charge amplifier, and start to read the data V'. After the end, turn off the power supply of the motor, lubricating oil pump, and instrument, check whether each line is loose, and check the collected data. the

Step 6. According to the formula N=K×V′, the dynamic rocker load N is obtained. the

Claims (1)

1. engine valve actuating mechanism valve rocker load measurement test unit; Comprise switch board, motor, scrambler, belt pulley, tested valve actuating mechanism, grease-box, foil gauge, dynamic strain indicator, data collecting card and host computer; Described tested valve actuating mechanism comprises camshaft, valve rocker and push rod, it is characterized in that:

The rotating speed of motor is controlled by switch board; The output shaft of motor rotates through the camshaft that belt pulley drives in the tested valve actuating mechanism; On described cam shaft gear end, scrambler is housed, the output terminal of scrambler is connected with an input end signal of data collecting card;

Post foil gauge on the valve end of the valve rocker of tested valve actuating mechanism; Described foil gauge output terminal is connected with the input end signal of dynamic strain indicator; The output terminal of dynamic strain indicator is connected with another input end signal of data collecting card, and the output terminal of data collecting card is connected with the host computer signal;

Described grease-box links to each other with the lubricated road of tested valve actuating mechanism oil inlet and outlet through oil pipe.

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