CN209280316U - A kind of device of test engine timing wheel train dynamic response - Google Patents

Abstract

The utility model discloses a kind of devices of test engine timing wheel train dynamic response, it include: several angular displacement sensor toolings, it is separately positioned on crankshaft toothed belt, the first toothed belt and the second toothed belt center, for measuring angular displacement, the angular velocity data of each toothed belt；Several laser displacement sensor toolings, are separately fixed on base, and the swing for measuring the amount of jitter of belt and the tensioner arm of automatic tensioner is displaced；Each angular displacement sensor tooling, the obtained signal of laser displacement sensor tooling are acquired by data collecting card, and are connected with computer, and required dynamic response value is obtained after processing.The utility model is obtained the transmission accuracy of train, saves time and the cost of endurance test by the dynamic response data of test timing wheel train phenomena such as being conducive to analysis and prevent the belt abnormal sound of train, failure；Effective technical support is provided with reliability test verifying for designing and developing for engine timing train.

Description

A device for testing dynamic response of engine timing gear train

technical field

The utility model relates to a dynamic response device in the timing transmission system of an engine, which is used for measuring the vibration of the timing belt section, the angular displacement and angular velocity fluctuation of each wheel and the swing angle of the tension wheel.

Background technique

With the continuous development of technology in the automotive field, the structure of the engine timing transmission system is becoming more and more compact. The transmission system not only needs to meet the dynamic characteristics requirements such as gear train load and transmission accuracy, but also needs to meet the reliability requirements. Generally speaking, the reliability of the wheel train is mainly verified by the durability test of the real vehicle, and in the early stage of prototype development, the dynamic characteristics of the sample are often obtained through theoretical calculations and bench tests, and are used to evaluate the wheel train Good or bad design. In the development of prototypes, the dynamic response of concern includes the lateral vibration of the timing belt, the angular displacement and angular velocity fluctuation of each wheel, and the swing angle of the tensioning arm. According to the angular displacement of each wheel, the driven wheel-driving wheel transmission error.

In the patent CN102854016A (authorized on June 4, 2015), a method for testing engine train belt vibration, slip and tensioner swing angle is described. In the patent, the laser displacement sensor is used to directly measure the amount of vibration of the belt, the rotation speed of each wheel is tested by the laser speed sensor, and the slip rate of the belt is obtained through the speed result; then the time domain signal of the swing acceleration on the tensioner is collected by the laser sensor, The peak value and frequency of the swing angle of the tensioner are obtained through Fourier transformation. However, this method is only applicable to the test of the drive system of the front-end accessories of the engine. It does not give the test method of the speed of the toothed wheel and the test method of the swing angle of the tensioner in the time domain. At the same time, the tooling of each sensor is not given, and the arm The swing angle of the longer and shorter tensioner cannot be directly tested by the method in the patent.

In the patent CN105588635A (published on May 18, 2016), a test method for adjusting the position and tension of the tensioner to optimize the sound quality of the timing belt is proposed, which is used to determine the tensioner in the early stage of engine timing system development. The best position and the size of the belt tension. By arranging multiple groups of noise sensors in the designated area of the belt system to obtain the sound quality of each position, using laser displacement sensors to measure the vibration of the timing belt of each belt segment; at the same time, the maximum and minimum static preload allowed are divided into several groups (greater than 5 groups), for sound quality and belt vibration tests. This method can effectively measure the sound quality under different tensions and find the optimum point of the sound quality, but the patent does not consider the change of the dynamic characteristics of the system under different pretensions.

Utility model content

The purpose of the utility model is to test whether the engine timing transmission system meets the reliability requirements, and propose a device for testing the dynamic response of the engine timing transmission system.

The technical scheme adopted in the utility model is as follows:

A device for testing the dynamic response of an engine timing train, comprising:

A plurality of angular displacement sensor toolings are respectively arranged at the center of the crankshaft toothed pulley, the first toothed pulley and the second toothed pulley, and are used to measure the angular displacement and angular velocity data of each toothed pulley;

A number of laser displacement sensor fixtures are respectively fixed on the machine base to measure the vibration of the belt and the swing displacement of the tensioning arm of the automatic tensioner;

The computer is connected with each angular displacement sensor tooling and laser displacement sensor tooling circuit through the data acquisition card, and is used to obtain the angular displacement and angular velocity of each pulley, the vibration amount of the belt and the tension arm of the automatic tensioner according to the collected data. Swing displacement, and at the same time convert the swing displacement of the tensioning arm into a swing angle value through geometric relations.

Further, the angular displacement sensor tooling includes an angular displacement encoder tooling, and the angular displacement encoder tooling includes an angular displacement encoder and a flange, and one end of the flange is provided with a connection with the angular displacement encoder. The blind hole is fixedly connected to the rotating shaft, and the other end of the flange is fixedly connected to the corresponding toothed pulley.

Further, the flange is radially provided with a threaded hole directly reaching the blind hole, and positioning bolts are arranged in the threaded hole; the encoder body of the angular displacement encoder is provided between the flange and the There is an installation gap of 1 to 2 mm.

Further, an inner chamber is provided at one end where the flange is connected to each toothed pulley.

Further, the angular displacement sensor tooling includes a Hall-type magnetic induction sensor tooling, and the Hall-type magnetic induction sensor tooling includes an L-shaped support and a Hall-type magnetic induction sensor, and the L-shaped support is provided with respectively connected The base and the oblong hole of the Hall-type magnetic induction sensor. The Hall-type magnetic induction sensor is fixed on the oblong hole on the L-shaped support through a nut and arranged at the peripheral position of the corresponding toothed pulley. The pulse signal generated between the grooves is used to obtain the angular velocity and angular displacement of the pulley.

Further, the Hall-type magnetic induction sensor tooling also includes an inline-shaped support provided with an oblong hole and matched with the L-shaped support.

Further, the laser displacement sensor tooling includes an L-shaped support and a laser displacement sensor fixed on the L-shaped support by bolts, and the L-shaped support is provided with an oblong hole for connecting the machine base and bolts .

Further, the effective measuring range of the measuring probe of the laser displacement sensor includes the maximum shaking range of the belt and the maximum swinging range of the tensioning arm.

Further, the said tension arm is provided with a straight iron piece with increased length.

Compared with the prior art, the technical effect of the utility model is:

The utility model, by testing the dynamic response data of the timing gear train, is beneficial to analyze and prevent phenomena such as abnormal sound and failure of the belt of the gear train, obtains the transmission accuracy of the gear train, and saves the time and cost of the durability test; Provide effective technical support for the design and development of the system and reliability test verification.

Description of drawings

Fig. 1 is the schematic diagram of the utility model timing gear train;

Fig. 2 is a schematic diagram of the device for testing the dynamic response of the engine timing gear train;

Fig. 3 is a schematic diagram of the test data acquisition system;

Fig. 4 is a schematic diagram of the test fixture of the angular displacement encoder shown in Fig. 2;

Fig. 5 is a schematic diagram of the test fixture of the laser displacement sensor shown in Fig. 2;

Fig. 6 is a schematic diagram of the swing angle test of the tension arm;

Fig. 7 is a schematic diagram of another available device for testing the timing gear train;

Fig. 8 is a schematic diagram of Hall-type magnetic induction sensor test tooling;

Fig. 9 is a schematic diagram of the amount _of jitter on the band B1;

Figure 10(a) is a schematic diagram of angular velocity fluctuations of the crankshaft CRK and the exhaust camshaft CAM1;

Figure 10(b) is a schematic diagram of the angular displacement fluctuation of the crankshaft CRK and the exhaust camshaft CAM1;

Fig. 11 is a schematic diagram of the swing angle of the tensioning arm;

Fig. 12 is a schematic diagram of the transmission error between the crankshaft CRK and the camshaft CAM1.

In the figure: 1-belt; 2-crankshaft toothed pulley; 3-driven idler; 4-first toothed pulley; 5-second toothed pulley; 6-automatic tensioner; 7-th An angular displacement encoder tooling; 71-angular displacement encoder; 711-rotary shaft; 712-encoder body; 72-flange; 721-blind hole; 722-threaded hole; 723-inner cavity; 73-locating bolt; 8-First laser displacement sensor tooling; 81-Laser displacement sensor; 811-Installation hole; 812-Measuring probe; 82-Bolt and nut set; 83-First L-shaped support; Through hole; 84-first bolt; 9-second angular displacement encoder tooling; 10-second laser displacement sensor tooling; 11-Hall-type magnetic induction sensor tooling; 111-Hall-type magnetic induction sensor; 112-second L 1121-the second oblong hole; 1122-the third oblong hole; 113-nut; 114-the second bolt; 12-the third angular displacement encoder frock.

Detailed ways

In order to better understand the utility model, the embodiments of the utility model will be described in further detail below in conjunction with the accompanying drawings.

Figure 1 shows a typical engine timing drive system using a belt 1 connected to the crankshaft pulley (CRK) 2, the driven idler pulley (IDL) 3, the first toothed pulley 4 connected to the exhaust camshaft (CAM1) and Connect the second toothed pulley 5 and the automatic tensioner (TEN) 6 of the intake camshaft (CAM2).

As shown in Figure 2, a device for testing the dynamic response of the engine timing gear train includes:

The first angular displacement encoder tooling 7 arranged at the center of the crankshaft toothed pulley 2, the second angular displacement encoder tooling 9 arranged at the center of the first toothed pulley 4, the tooling 9 arranged at the center of the second toothed pulley 5 The third angular displacement encoder tooling 12 is used to measure the angular displacement and angular velocity data of each toothed pulley.

The first laser displacement sensor tooling 8 for measuring the amount of vibration of the belt, the second laser displacement sensor tooling 10 for measuring the swing displacement of the tensioning arm of the automatic tensioner 6, are respectively fixed on the machine base; it can be seen that , one of the two first laser displacement sensor fixtures 8 faces the middle of the belt 1 between the first toothed pulley 4 and the second toothed pulley 5, and the other faces the first toothed pulley 4 and the second toothed pulley 5. The middle part of the belt 1 between the driven idler pulleys 3, while the second laser displacement sensor tooling 10 faces the tensioning arm of the automatic tensioner 6.

The mechanisms of the three angular displacement sensor tooling are similar, including an angular displacement encoder 71 and a flange 72, and one end of the flange 72 is provided with a blind hole 721 fixedly connected to the rotating shaft 711 of the angular displacement encoder 71, The other end of the flange 72 is fixedly connected to the corresponding toothed pulley by means of glue.

The flange 72 is radially provided with a threaded hole 722 directly reaching the blind hole 721, and the threaded hole 722 is equipped with a positioning bolt 73, which can be screwed into the positioning bolt 73 to fasten the rotating shaft 711;

Preferably, an inner cavity is provided at one end of the flange connecting each toothed pulley, avoiding devices such as fastening bolts on the crankshaft. At the same time, an installation gap of 1-2 mm is provided between the encoder body and the flange of the angular displacement encoder to prevent rotational interference.

During the test, the rotary shaft 711 of the angular displacement encoder 71 rotates with the flange 72 to obtain signals of angular displacement and angular velocity θ _i , And the encoder main body 712 does not rotate with the flange 72 .

As preferably, as shown in Figure 5, two first laser displacement sensor frocks 8 comprise the first L-shaped support 83, the laser displacement sensor 81 fixed on the first L-shaped support 83 by bolts, as shown The laser displacement sensor 81 is provided with an installation hole 811, and the first L-shaped support 83 is provided with an installation through hole 832 connecting the shown laser displacement sensor 81 through the bolt and nut group 82, and connecting the machine base through the first bolt 84 The first oblong hole 831.

Preferably, in order to meet the testing requirements of different positions, the first L-shaped support 83 can be matched with the in-line support with oblong holes to meet different layout characteristics.

Preferably, the effective measuring range of the measuring probe 812 of the laser displacement sensor 81 includes the maximum shaking range of the belt and the maximum swinging range of the tensioning arm.

As preferably, the structure of the second laser displacement sensor tooling 10 for measuring the swing displacement of the tensioning arm of the automatic tensioner 6 is similar to the first laser displacement sensor tooling 8, correspondingly, as shown in Figure 2, the The tension arm is provided with a length-increased in-line iron piece, which extends the measuring arm to facilitate displacement testing.

The signals obtained by each angular displacement encoder and laser displacement sensor are collected by a data acquisition card and connected with a computer for data processing.

As preferably, as shown in Figure 3, the present embodiment adopts LMS data acquisition system to be connected with computer, obtains the angular displacement of belt pulley, angular velocity, the jitter amount of belt and the swing displacement of the tensioning arm of automatic tensioner; And according to Fig. According to the geometric relationship shown in 6, the swing angle of the tensioning arm is obtained.

As shown in Fig. 7 and Fig. 8, in another feasible embodiment of the present utility model, three angular displacement encoder frocks are replaced by three Hall-type magnetic induction sensor frocks 11 positioned on the sides of each toothed pulley, The Hall-type magnetic induction sensor tooling 11 includes a second L-shaped support 112 and a Hall-type magnetic induction sensor 111, and the second L-shaped support 112 is provided with a socket for connecting the base and the Hall-type magnetic induction sensor 111 respectively. The third oblong hole 1122 and the second oblong hole 1121 are respectively used to adjust the height of the Hall-type magnetic induction sensor 111 and the installation position of the second L-shaped support 112 on the base. The front end of the Hall-type magnetic induction sensor 111 is a threaded segment, and the Hall-type magnetic induction sensor 111 is fixed on the second oblong hole 1121 on the second L-shaped support 112 through two nuts 113, and at the same time, the The second L-shaped support 112 is fixed on the frame by the second bolt 114 .

The difference from the above embodiment is that the Hall-type magnetic induction sensor 111 is arranged at the peripheral position of the corresponding toothed pulley, and when the Hall-type magnetic induction sensor 111 respectively detects the tooth top and tooth groove, the signal will appear and disappear; The pulse signal generated between the tooth top and the tooth groove can obtain the angular velocity and angular displacement of the pulley.

Preferably, in order to meet the testing requirements of different positions, the second L-shaped support 112 cooperates with the in-line support with oblong holes to meet different layout characteristics.

Preferably, the Hall-type magnetic induction sensor 111 can be flexibly arranged around the gear teeth, and is not limited to a position scheme shown in FIG. 7 .

A method for testing the dynamic response of the engine timing gear train based on the device, comprising the steps of:

Use the laser displacement sensor tooling to collect the belt vibration δ (see Figure 9) and the swing displacement of the tension arm at the middle position of the two toothed pulleys; use the angular displacement sensor tooling to collect the angular displacement θ _i and angular velocity of each toothed pulley data;

According to angular displacement θ _i , angular velocity Compare the data with the theoretical angular displacement and angular velocity to obtain the fluctuation (see Figure 10(a) and 10(b)); use the geometric relationship (see Figure 6) to obtain the swing angle value _θt of the tension arm (see Figure 11), and get the frequency domain value of the tension arm swing angle by Fourier transform:

Among them, the swing angle of the tension arm needs to be obtained through the displacement conversion of the tension arm. As shown in Figure 6, the fulcrum of the tension arm is P, the arm length is PC, and the distance between the measurement point of the laser displacement sensor and the fulcrum P is L. Knowing the initial swing angle α of the tension arm, the corresponding fulcrum distance h ₀ and the measurement distance h ₁ of the laser displacement sensor 10, when the tension arm swings to PC', the measurement distance of the laser displacement sensor 10 becomes h ₂ , The tension arm swing angle is θ _t .

Calculate the transmission error ε between toothed pulley j and toothed pulley i (see Figure 12):

ε＝θ _i -R _j θ _j /R _i

where R _j is the radius of wheel j, θ _j is the angular displacement of wheel j, R _i is the radius of wheel i, and θ _i is the angular displacement of wheel i.

The test results such as the amount of jitter, angular displacement, angular velocity, and tension arm swing angle are time-domain values, and their corresponding frequency and amplitude results can be obtained through Fourier transform.

The above-described embodiments are only preferred solutions of the utility model, and are not intended to limit the utility model in any form. There are other variations and modifications on the premise of not exceeding the technical solution described in the claims.

Claims (9)

1. a kind of device of test engine timing wheel train dynamic response, it is characterised in that: include:

Several angular displacement sensor toolings are separately positioned in crankshaft toothed belt, the first toothed belt and the second toothed belt The heart, for measuring angular displacement, the angular velocity data of each toothed belt；

Several laser displacement sensor toolings, are separately fixed on base, for measuring the amount of jitter and automatic tensioner of belt Tensioner arm swing displacement；

Computer is connect with each angular displacement sensor tooling, laser displacement sensor tool circuit by data collecting card, is used for Angular displacement, the angular speed of each belt wheel, the pendulum of the tensioner arm of the amount of jitter and automatic tensioner of belt are obtained according to the collected data Dynamic displacement, while the swing of tensioner arm being displaced, pivot angle value is converted to by geometrical relationship.

2. the device of test engine timing wheel train dynamic response according to claim 1, it is characterised in that: the angle Displacement sensor tooling includes displacement coder tooling, and the displacement coder tooling includes displacement coder, method Orchid, one end of the flange are provided with the blind hole being fixedly connected with the rotary shaft of the displacement coder, the flange it is another One end is fixedly connected with corresponding toothed belt.

3. the device of test engine timing wheel train dynamic response according to claim 2, it is characterised in that: the flange On be disposed radially the threaded hole of the blind hole of going directly, be equipped with positioning bolt in the threaded hole；The angle position Move the installation gap that 1 ~ 2mm is provided between the encoder main body and flange of encoder.

4. the device of test engine timing wheel train dynamic response according to claim 2, it is characterised in that: the flange The one end for connecting each toothed belt is provided with inner cavity.

5. the device of test engine timing wheel train dynamic response according to claim 1, it is characterised in that: the angle Displacement sensor tooling includes Hall-type magnetic induction sensor tooling, and the Hall-type magnetic induction sensor tooling includes L shape Support, Hall-type magnetic induction sensor are provided on the L shape support and are separately connected base and Hall-type magnetic induction sensor Slotted hole on the slotted hole that the Hall-type magnetic induction sensor is fixed on the L shape support by nut and is arranged in pair Toothed belt peripheral position is answered, using the pulse signal generated between tooth top and tooth socket, obtains angular speed, the angular displacement of belt wheel.

6. the device of test engine timing wheel train dynamic response according to claim 5, it is characterised in that: it is described suddenly Your formula magnetic induction sensor tooling further includes the linear type support for being provided with slotted hole, matching with L shape support.

7. the device of test engine timing wheel train dynamic response according to claim 1, it is characterised in that: described swashs Optical displacement sensor tooling includes the laser displacement sensor for setting L shape support, being bolted on the L shape support, institute State the slotted hole and bolt that connection base is provided on L shape support.

8. the device of test engine timing wheel train dynamic response according to claim 7, it is characterised in that: the laser The effective range of the measuring probe of displacement sensor includes the maximum jitter range of belt and most putting on for the tensioner arm Dynamic range.

9. the device of test engine timing wheel train dynamic response according to any one of claim 1 to 8, feature exist In: the linear type iron plate for increasing length is provided on the tensioner arm.