CN111982373A - Measuring device and measuring method for hub load of automatic tensioner - Google Patents

Abstract

The invention discloses a measuring device and a measuring method for the wheel hub load of an automatic tensioner. The device comprises an automatic tensioner, a bearing, a tooling part, a wheel hub load sensor, a tensioning wheel, a bearing dust cover and a bolt; the The tensioning arm of the automatic tensioner has a journal on which the bearing is installed, and the tooling part is located on the surface of the journal; the wheel hub load sensor is arranged on the tooling part, and the bearing and the tensioner have an interference fit, so the The tensioner and the tooling parts are fixed on the bearing through the bearing dust cover and bolts. The measuring device of the invention has a compact and simple structure and low cost, can effectively and conveniently obtain the wheel hub load of the automatic tensioner, and can obtain the working torque of the tensioner at each crankshaft wheel speed by real-time conversion, so as to reduce belt slippage and breakage, etc. Risks, improve the design accuracy of the wheel train of the engine front-end accessory drive system, etc.

Description

A kind of measuring device and measuring method of automatic tensioner hub load

technical field

The invention relates to a measuring device and a method for measuring working torque of a tensioner hub load, in particular to a measuring device and a measuring method for an automatic tensioner hub load.

Background technique

In the front-end accessory system of the engine, the output power of the crankshaft is transmitted to each load wheel through the belt, and the stress state of each load wheel is directly related to the system's gear train layout and service life. In the early development process of the accessory system, the tension meter is often used to measure the tension of each belt segment in the system under the static condition of the engine at this stage to verify whether the pre-tightening force of the belt meets the requirements, see patent CN104870957A. However, under the dynamic condition of the engine, it is difficult to accurately measure the hub load of each load wheel in real time and obtain the working state of the pulley, which makes it difficult to accurately design the accessory gear train. In particular, if the hub load of the automatic tensioner in the accessory system is too large, the belt will be prone to fatigue fracture, and if the hub load is too small, it will cause the system to slip, resulting in poor NVH performance of the system.

In patent CN204269278U, a collection unit for dynamic tension of automobile engine belt is described. In the patent, the load signal of the belt is collected by arranging a force sensor with a lead wire, and then the wheel hub load of the pulley is obtained through data processing. However, the device needs to modify and design the original bearing inner ring, which is difficult to process, and there are lead wires which cause trouble in layout.

In patent CN203606057U, an engine idler dynamic measurement device is described. In the patent, a simulated idler consisting of a hub member and an outer ring is designed, and a strain gauge is attached to the spoke of the hub member, and then the strain amount of the strain gauge is collected, and then the load acting on the idler by the belt is converted. Although this method can obtain the dynamic load of the idler, the structure design of the idler is complex and difficult to process; the wiring of the strain gauge is inconvenient, and the web is easy to fall off, and the measurement accuracy of the strain gauge is easily affected by various factors. interference, resulting in unreliable measurement results.

SUMMARY OF THE INVENTION

The present invention is a device and method for measuring the hub load of an automatic tensioner. The invention has the advantages of simple structure and convenient operation, can obtain the wheel hub load of the automatic tensioner in real time, prevent the adverse effects caused by excessively large or too small wheel hub loads, and can be used to verify the reliability of the design of the wheel train in real time.

The present invention is realized by at least one of the following technical solutions.

An automatic tensioner wheel hub load measuring device, comprising an automatic tensioner, a bearing, a tooling part, a wheel hub load sensor, a tensioning wheel, a bearing dust cover and a bolt; the tensioning arm of the automatic tensioner is provided with The journal of the bearing is installed, and the tooling part is located on the surface of the journal; the hub load sensor is arranged on the tooling part, the bearing and the tensioning wheel are in interference fit, and the tensioning wheel and the tooling part are prevented by the bearing. Dust caps and bolts are attached to the bearings.

Further, the journal is provided with a first positioning pin hole and a second positioning pin hole.

Further, the tooling component includes a pressure plate, a gasket and a main board, and the main board is provided with a concave groove for placing the wheel hub load sensor, a first pin hole and a second pin hole.

Further, the first pin hole, the first locating pin hole, the second pin hole and the second locating pin hole are arranged on the upper end face of the journal in a concentric manner, and the circumferential Orientation.

Further, the pressing plate has a circular arc surface and a rectangular surface, wherein the circular arc surface is matched with the bearing inner ring, and the rectangular surface is in contact with one end surface of the wheel hub load sensor.

Further, the wheel hub load sensor is arranged in the action direction of the wheel hub load, and the surface of the wheel hub load sensor in contact with the main board is provided with a gasket, and the gasket is used to prevent loosening.

Further, the sum of the height of the main plate and the height of the journal is equal to the height of the bearing.

Further, the bearing and the journal are in clearance fit; the height of the journal is smaller than the height of the bearing of the tensioning wheel.

Further, the geometrical arrangement of the first locating pin hole and the second locating pin hole on the journal is determined according to the wheel train layout of the engine front-end accessory drive system, and are symmetrically arranged on both sides of the wheel hub load acting direction.

Based on the measurement method of the described automatic tensioner hub load measurement device, in an engine front-end accessory drive system including several load wheels, the belt is wrapped around the tension wheel with a certain wrap angle φ, and the tension arm has a Fixed fulcrum; in order to maintain the stability of the system tension, the working torque M _N of the tensioner is:

In the formula: L _t is the radial distance from the rotation center of the tensioner mandrel to the rotation center of the tension wheel, referred to as the length of the tension arm arm; F _t is the belt acting on the tension wheel under any engine condition The resultant force of the tension is the hub load; γ is the angle between the tension arm and the direction of the hub load;

Among them, the angle γ between the tension arm and the action direction of the wheel hub load is obtained by converting the displacement of the test tension arm, and the wheel hub load F _t is obtained according to the actual measurement of the wheel hub load sensor.

Compared with the prior art, the technical effect of the present invention is:

The device for measuring the wheel hub load of the automatic tensioner has the advantages of compact and simple structure and low cost, can effectively and conveniently obtain the wheel hub load of the automatic tensioner, reduce the risks of belt slippage and breakage, etc. The design accuracy of the gear train can be obtained in real time, and the working torque of the tensioner at each crankshaft wheel speed can be obtained in real time.

Description of drawings

Fig. 1 is the schematic diagram of the measuring device of a kind of automatic tensioner wheel hub load of the present embodiment;

2 is a schematic structural diagram of the tensioning arm of the present embodiment;

FIG. 3 is a schematic diagram of a wheel hub load installation tooling component of the present embodiment;

Figure 4. The force analysis diagram of the tensioner in the classic engine front-end accessory system;

Fig. 5 is the actual measurement result of the hub load of the automatic tensioner under the constant average rotational speed of the crankshaft of the present embodiment;

Fig. 6 is the actual measurement result of the output torque of the automatic tensioner under the constant average rotational speed of the crankshaft of the present embodiment;

In the figure: 1-automatic tensioner; 101-first positioning pin hole; 102-second positioning pin hole; 103-shaft journal; 104-tensioning arm; 2-bearing; 3-tooling part; 301-first Pin hole; 302-Second pin hole; 303-Concave groove; 304-Press plate; 305-Spacer; 306-First pin; 307-Second pin; 308-Main board; Tightening wheel; 6-bearing dust cover; 7-installation bolt.

Detailed ways

In order to better understand the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

As shown in Fig. 1, a measuring device for the hub load of an automatic tensioner mainly includes an automatic tensioner 1, a bearing 2, a tooling part 3, a hub load sensor 4, a tensioner 5, a dust cover 6 and a bolt 7 . The wheel hub load sensor is used to collect the belt resultant force signal acting on the tensioner.

As shown in FIG. 2 , the tensioning arm 104 of the automatic tensioner 1 has a journal 103 on which the bearing 2 is installed. The bearing 2 and the tensioner 5 are in an interference fit, and the bearing 2 and the journal 103 are in clearance fit; the height of the journal 103 is less than the height of the bearing 2 on which the tensioner 5 is installed, and the journal 103 has a mounting The first positioning pin hole 101 and the second positioning pin hole 102 of the tooling part 3;

The first positioning pin hole 101 and the second positioning pin hole 102 on the journal 103 need to be geometrically arranged according to the wheel train layout of the engine front-end accessory drive system, and are symmetrically arranged on both sides of the wheel hub load action direction;

As shown in FIG. 3 , the tooling component 3 for installing the wheel hub load sensor 4 mainly includes a pressure plate 304 , a gasket 305 and a main plate 308 , and the main plate 308 is provided with a rectangular concave groove 303 , a first pin hole 301 and a second Pin holes 302 . The first pin hole 301, the first positioning pin hole 101, the second pin hole 302 and the second positioning pin hole 102 are arranged concentrically on the upper end surface of the journal 103, and pass through the first pin 306, the second The pins 307 enable circumferential positioning.

The wheel hub load sensor 4 has the function of Bluetooth data transmission, and does not need to be connected with the signal collector by the lead wire, and can directly transmit the signal to the data acquisition device;

The concave groove 303 on the main plate 308 is used to install the wheel hub load sensor;

The pressing plate 304 has a circular arc surface and a rectangular surface. Wherein, the arc surface is matched with the inner ring of the bearing 2, and the rectangular surface is in contact with one end surface of the wheel hub load sensor 4;

The wheel hub load sensor 4 is arranged in the action direction of the wheel hub load, and the surface of the wheel hub load sensor 4 in contact with the main board 308 is provided with a gasket 305, and the gasket 305 is used to prevent loosening;

The dust cover 6 is located on the tensioner 5 , and the shaft journal 103 and the tooling part 3 are axially positioned through a dust cover 6 and bolts 7 .

A measuring method for obtaining the working torque of the tensioner based on the device for measuring the load of the automatic tensioner wheel hub.

Figure 4 shows the classic engine front-end accessory system. The load wheel is the motor wheel (ALT), the air conditioner compressor wheel (AC), the drive wheel is the crankshaft wheel (CS), and the belt is wrapped around the tension wheel (TEN) at a certain wrap angle φ. ), the tension arm swings around the pivot point (P) at a certain angular velocity (ω). In order to maintain the stability of the system tension, the working torque M _N of the tensioner is:

In the formula: L _t is the radial distance from the rotation center of the tensioner mandrel to the rotation center of the tension wheel, referred to as the length of the tension arm arm; F _t is the belt acting on the tension wheel under any engine condition The resultant force of tension is the hub load; γ is the angle between the tension arm and the direction of the hub load.

Among them, the angle γ between the tension arm and the action direction of the hub load can be obtained by testing the displacement of the tension arm, and the hub load F _t can be obtained according to the actual measurement of the tooling part 3 and the hub load sensor 4. Figure 5 shows the automatic tensioning Figure 6 is the calculation result of the tensioner working torque converted from the actual measurement results of the automatic tensioner hub load when the crankshaft wheel speed is 1000r/min.

The above-mentioned embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, The simplification should be equivalent replacement manners, which are all included in the protection scope of the present invention.

Claims (10)

1. An automatic tensioner hubload measuring device, comprising: the device comprises an automatic tensioner (1), a bearing (2), a tool part (3), a wheel hub load sensor (4), a tension wheel (5), a bearing dust cover (6) and a bolt (7); the tensioning arm 104 of the automatic tensioner (1) is provided with a journal (103) for mounting a bearing (2), and the tool part (3) is positioned on the surface of the journal (103); wheel hub load sensor (4) set up on frock part (3), bearing (2) and take-up pulley (5) interference fit, take-up pulley (5) and frock part (3) are fixed on bearing (2) through bearing shield (6) and bolt (7).

2. The automatic tensioner hubload measurement device of claim 1, wherein: the shaft neck (103) is provided with a first positioning pin hole (101) and a second positioning pin hole (102).

3. The automatic tensioner hubload measurement device of claim 2, wherein: the tool component (3) comprises a pressing plate (304), a gasket (305) and a main plate (308), wherein a concave groove (303) for placing the wheel hub load sensor (4), a first pin hole (301) and a second pin hole (302) are formed in the main plate (308).

4. The automatic tensioner hubload measurement device of claim 3, wherein: the first pin hole 301 and the first positioning pin hole (101), the second pin hole 302 and the second positioning pin hole (102) are concentrically arranged on the upper end face of the journal (103), and are circumferentially positioned by a first pin (306) and a second pin (307), respectively.

5. The automatic tensioner hubload measurement device of claim 4, wherein: the pressing plate (304) is provided with an arc surface and a rectangular surface, wherein the arc surface is matched with the inner ring of the bearing (2), and the rectangular surface is in contact with one end face of the hub load sensor (4).

6. The automatic tensioner hubload measurement device of claim 5, wherein: the hub load sensor (4) is arranged in the action direction of the hub load, a gasket (305) is arranged on the surface, in contact with the main plate (308), of the hub load sensor (4), and looseness prevention is achieved through the gasket (305).

7. The automatic tensioner hubload measurement device of claim 6, wherein: the sum of the height of the main plate (308) and the height of the journal (103) is equal to the height of the bearing (2).

8. The automatic tensioner hubload measurement device of claim 7, wherein: the bearing (2) is in clearance fit with the journal (103); the height of the journal (103) is smaller than the bearing height of the tension wheel (5).

9. The automatic tensioner hubload measurement device of claim 8, wherein: the first positioning pin hole (101) and the second positioning pin hole (102) on the journal (103) are geometrically arranged according to the gear train layout of the engine front end accessory driving system and symmetrically arranged on two sides of the action direction of the wheel hub load.

10. The measuring method of the automatic tensioner hubload measuring apparatus according to any one of claims 1 to 9, characterized in that: in an engine front end accessory drive system comprising a plurality of load wheels, a belt wraps a tension wheel at a certain wrap angle phi, and a fixed pivot point exists on a tension arm; in order to maintain the tension of the system stable, the working moment M of the tensioner_NComprises the following steps:

in the formula: l is_tThe radial distance between the rotation center of the central spindle of the tensioner and the rotation center of the tensioning wheel is referred to as the arm length of the tensioning arm for short; f_tThe resultant force of the belt tension acting on the tension pulley under any engine working condition is the wheel hub load; gamma is the included angle between the tensioning arm and the wheel hub load acting direction;

wherein, the included angle gamma between the tensioning arm and the wheel hub load acting direction is obtained by the conversion of the displacement of the testing tensioning arm, and the wheel hub load F_tAnd the measured values are obtained according to the wheel hub load sensor (4).

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