JPH0570734B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is aimed at reducing the unbalance of the damper pulley itself when manufacturing a damper pulley that is attached to the tip of a crankshaft and suppresses vibrations caused by bending, torsion, etc. This invention relates to a damper pulley balancing method that effectively removes damper pulleys.

<Prior Art> Generally, an automobile engine has a crankshaft for converting the reciprocating motion of the piston into rotational motion, and the driving force transmission torque is taken out from one end, and the auxiliary equipment such as an alternator is taken out from the other end. Power is extracted through a pulley mechanism to operate the machine.

Incidentally, the crankshaft is subjected to excitation force due to the explosive force of the engine cylinder, and is subjected to torsional vibrations due to circumferential movement, and bending vibrations are also excited due to inertial force and explosive force. To this end, a dynamic damper having a torsional damper function and a bending damper function has been developed, and, for example, a crank damper pulley P as shown in FIG. 6C has come to be used.

Since this type of damper pulley P is used by being attached to the tip of the crankshaft, it is important to reduce dynamic unbalance under high-speed rotation conditions. The amount of unbalance of the entire pulley is measured, and if there is any unbalance, the balance is corrected by drilling holes with a drilling machine or the like.

<Problems to be Solved by the Invention> However, this type of damper pulley P with a dynamic damper has a complicated structure combining a large number of parts, and the conventional method described above does not achieve sufficient balance as a whole. Even if the
There is not enough balance.

That is, the structure of the damper pulley P with the dynamic damper is comprised of a first pulley A1 and a second pulley A2, as shown in FIGS. 6A and 6B.

This first pulley A1 is a pulley hub 10 fixed to the tip of the crankshaft via a key.
and a ring-shaped inner mass damper 14 which is integrally fixed to the front recess 12 of the pulley hub 10 via a damper rubber 13 by vulcanization adhesive treatment.
Among these, the mass damper 14 functions as a bending damper and absorbs bending vibrations of the crankshaft.

Also, the second pulley A2 is the intermediate sleeve 16.
A damper rubber 1 is attached to the outer periphery of this intermediate sleeve 16.
The outer mass damper 18 is integrally fixed by vulcanization adhesive treatment through the outer mass damper 18, and this outer mass damper 18 functions as a torsional damper and suppresses torsional vibration in the circumferential direction. .

In the case where the inner mass damper 14 is bonded to the pulley hub 10 and the outer mass damper 18 is bonded to the intermediate sleeve 16 in this way, each of the individual components such as the inner mass damper 14 or the outer mass damper 18 may be slightly damaged. Unbalance occurs in each component due to misalignment. The unbalance caused by such misalignment cannot be removed by correcting the dynamic unbalance of the entire damper pulley in the past, and the unbalance of the internal mass damper cannot be removed.
This misalignment causes shearing stress to be applied to the damper rubber 13 due to centrifugal force caused by rotational fluctuations, which has the disadvantage of significantly reducing durability.

To do this, first, only the pulley hub 10 is balanced, then the first pulley arm A1 with the inner mass damper 14 bonded to this pulley hub 10 is balanced, and then the second pulley arm A2 is combined with the first pulley arm A1. This can be dealt with by correcting the overall dynamic imbalance, but such a method requires complicated processes and
A balancing process is required, resulting in increased equipment costs and higher costs.

<Structure of the Invention> As described above, the damper pulley P to be balanced in the present invention is composed of the pulley hub 10, the inner mass damper 14, the intermediate sleeve 16, and the outer mass damper 18, and the unbalance of the damper pulley P composed of these many parts can be completely corrected. To remove it,
It is necessary to balance each component one by one while assembling them one by one, which complicates the process and requires a large number of balancing machines.

Therefore, in the present invention, the unbalance of the inner mass damper 14 that acts as a shearing force on the damper rubber 13 is a fatal defect especially for the damper pulley P, so this is removed individually, and the other components are removed as a whole from the damper pulley. I decided to remove it.

Further, when the unbalance of the internal mass damper 14 is X, the deflection of the internal mass damper 14 is Y, and the weight of the internal mass damper 14 is W, the relationship between the three is expressed by the following formula.

X=W×Y Here, when the weight W of the inner mass damper 14 is kept constant and the deflection Y is changed, the unbalance It became clear. The deviation of the measurement points from the straight line in this figure is thought to be due to manufacturing variations such as the coaxiality of the inner and outer diameters of the inner mass and the inclination of the inner mass during vulcanization.

Therefore, the inner mass damper 1 can be adjusted based on the deflection Y of the inner diameter of the inner mass damper 14 without performing dynamic balancing.
We decided to measure the imbalance of 4.

That is, the feature of the balancing method of the present invention is that the internal mass damper 14 is balanced with respect to the pulley hub 10 before balancing the damper pulley body, and as a method of balancing, the internal mass damper 14 is balanced with respect to the pulley hub 10. The reason is that the balancing step is simplified by measuring the runout Y of the inner diameter.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. First, a specific example of an internal mass damper balancing device used for balancing the internal mass damper 14 will be explained with reference to FIG. There is. A support part 22 is formed at the upper end of this support shaft 21, and a damper pulley P is fitted and supported on this part.
The damper pulley P is clamped to the support portion 22 by operating a clamp rod 24 inserted through the center of the support shaft 21 using a clamp cylinder 23. An indexing motor 25 and an encoder 26 are connected to the lower end of the support shaft 21 via gears.
are connected so that the support shaft 21 can be rotated and its rotational phase can be detected by an encoder 26. Further, a gap sensor 28 is installed above the support shaft 24 so as to face the inner periphery of the inner mass damper 14, and the deflection Y of the inner mass damper 14 with respect to the pulley hub 10 is detected from the output signal from the gap sensor 28. It's getting old.

Further, above the support shaft 21, a processing device 30 for correcting the internal mass damper balance is installed. This processing device 30 includes a drill 31 and a
A drive motor 33 that rotates the drill 31, a feed screw mechanism 34 that moves the machining head 32 up and down toward the damper pulley P, and a feed motor 35 that rotates the feed screw mechanism 34. The feed motor 35 moves the drill 31 up and down, and the encoder 36 detects the feed amount, and a balance correction hole H of a required depth is drilled in the inner mass damper 14. It is starting to be processed.

Further, 40 is an internal mass damper balancing control device. This balancing control device 40 mainly includes a microprocessor 41 and a memory 42. The microprocessor 41 is connected to the encoders 26, 36 and the gap sensor 28 via an interface 43, and a drive unit 44. , 45 to the drive motor 25 and the feed motor 35, and is further connected to the clamp cylinder 2 via an interface 43.
It is connected to a hydraulic circuit 46 that operates 3.

The memory 42 is stored in the memory 42, which detects the deflection and deflection direction of the inner mass damper 14 from the signals of the encoder 26 and the gap sensor 28 as shown in the flowchart shown in FIG. The balance is calculated, and based on the result of this calculation, a balance correction hole H of the required depth is inserted at the position where the unbalance is removed.
A program is stored to control the drive motor 25 and the processing device 30 so that the processing can be performed.

FIG. 2 shows a total balancing device for balancing the entire damper pulley after balancing the inner mass damper 14. In the figure, 50 is a rotating shaft, which is rotatably supported by a bearing unit 51. , this bearing unit 51 is supported by a spring 53 with respect to a fixed portion 52 so as to be movable in the radial direction. At the upper end of the rotating shaft 50, there is a mounting portion 5 that fits and supports the damper pulley P.
4 is formed, and a rotation motor 55 and an encoder 56 are connected to the lower end via a universal joint 58 and a gear train.The rotation motor 55 rotates the damper pulley P at high speed, and the rotational phase is transmitted to the encoder 56. It is now possible to detect Further, a detector 57 is mounted on the bearing unit 51, and the detector 57 detects an unbalance caused by the rotation of the damper pulley P.

On the other hand, above the rotating shaft 50, a total balance correction processing device 60 is installed. Similar to the processing device 30 for correcting the internal mass damper balance, this processing device 60 includes a drill 61 and a processing head 62.
It consists of a drive motor 63, a feed screw mechanism 64, a feed motor 65, and an encoder 66.The feed motor 65 moves the drill 61 up and down, and the encoder 65 detects the feed amount. A balance correction hole H of a predetermined depth is machined in 18.

Furthermore, this total balancing device is provided with a total balancing control device 70. This control device 70 is a microprocessor 71
A microprocessor 71 is connected to the encoders 56, 66 and the detector 57 via an interface 73, and is connected to the rotation motor 55 and the feed motor 65 via drive units 74, 75. is connected to.

The memory 72 detects the unbalance amount and the unbalance direction of the entire damper pulley from the signals from the encoder 56 and the detector 57, as shown in the flowchart shown in FIG. 4, which will be described later. A program is stored that controls the rotation motor 55 and the processing device 60 so that a balance correction hole H of a required depth can be formed at the position where the hole H is removed.
Note that a clamping device for manually clamping the pulley is provided at the tip of the rotating shaft, but is not shown.

Next, the balancing work in the above configuration will be explained.

First, the damper pulley P to be balanced is mounted on the support shaft of the internal mass damper balancing device. When the internal mass damper balance control device 40 starts operating in such a state, it starts processing based on the flowchart shown in FIG.
At 100, the clamp cylinder 23 is actuated,
A damper pulley P is clamped onto the support shaft 21. Next, in step 101, drive unit 4
The damper pulley P is rotated at a low speed by outputting a pulse signal to the indexing motor 25 via the indexing motor 25.

Next, in step 102, the encoder 26 and the gap sensor 28 read out the angular phase θ of the damper pulley P at that time and the deflection Y of the inner mass damper 18 at the angular phase θ, as shown in FIG. Next, in step 103, the maximum deflection amount Y1 and its angular position θ1 are calculated from the sampled data, and further in step 104, this deflection Y1 is converted into an unbalance amount X.

In step 105, a pulse is applied to the indexing motor 25 to index the damper pulley P to a phase corresponding to the unbalanced direction, and then step 105
At 106, the machining head 32 is lowered by a stroke corresponding to the unbalance amount, and a balance correction hole H of a predetermined depth is machined at a required angular phase with respect to the internal mass damper 14. After the correction process, the clamp cylinder 23 is operated in step 107,
Damper pulley P is unclamped.

As a result, the unbalance of the internal mass damper 14 is corrected, and then this damper pulley P is transferred to the total balance correction device shown in FIG. 2, and is clamped onto the rotating shaft 50 by a clamping device (not shown). Thereafter, at the same time as this total balance correction device is activated, the total balance correction control device 70 starts processing based on the flowchart shown in FIG. First, in step 200, the rotation motor 5
5 is driven to cause the rotating shaft 50 to rotate at high speed. Next, in step 201, the signals of the detector 57 and encoder 56 are read, and then in step 202, the amount of unbalance and the direction of unbalance are calculated from the detection signals.

Next, in step 203, a pulse is applied to the rotation motor 55 to index the damper pulley P to a position corresponding to the unbalance direction, and then in step 205, the processing head 62 is lowered by a stroke corresponding to the unbalance amount. , a total balance correction hole H of a predetermined depth is machined in the outer mass damper 18, and a series of balancing steps are completed.

In this way, by correcting the unbalance caused by the deflection of the inner mass damper 14 with respect to the pulley hub 10, and then correcting the unbalance of the entire damper pulley, the inner mass damper 14 can be adjusted relative to the inner mass damper 14.
The centrifugal force caused by the vibration of the damper rubber 13 is no longer applied, and as a result, no shear stress is applied to the damper rubber 13, improving durability and allowing stable rotation as a whole.

<Effects of the Invention> As detailed above, the present invention detects and corrects the unbalance caused by the runout of the internal mass damper with respect to the pulley hub before correcting the total unbalance of the entire damper pulley. This prevents shear stress from acting on the damper rubber due to centrifugal force caused by vibration.
The durability of the damper rubber can be increased.
In addition, the damper pulley as a whole is not unbalanced, allowing stable rotation, and there are fewer steps for manufacturing the damper pulley, which has the advantage of reducing manufacturing costs.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a block diagram of an internal mass damper balancing device used in the internal mass damper balancing process, and FIG.
The figure is a block diagram of the total balancing device used in the process of balancing the entire damper pulley.
Figures 3 and 4 are flowcharts showing the flow of balancing, Figure 5 is a graph showing the occurrence of runout of the inner mass damper due to the index rotation of the damper pulley, Figure 6 is a partial sectional view of the damper pulley, 7
The figure is a graph showing the relationship between the deflection of the inner mass damper and the amount of unbalance. P...Dampa pulley, 10...Booli hub, 1
4...Inner mass damper, 18...Outer mass damper.

Claims (1)

[Claims] 1. A damper pulley consisting of a first pulley assembly having an inner mass damper fixed to the side surface of a pulley hub provided at the tip of the engine crankshaft via damper rubber, and a second pulley assembly having an outer mass damper fixed to the outer periphery of an intermediate sleeve via damper rubber. In the balancing method, first, in order to balance the internal mass damper, there is an eccentricity measuring step in which the damper pulley is rotated at low speed and the eccentricity of the internal mass damper is measured, and an eccentricity is calculated from the measured eccentricity of the internal mass damper. A calculation step for calculating the amount of balance and unbalance direction, and an internal mass damper unbalance correction step for processing the internal mass damper based on the calculation results to correct unbalance due to eccentricity of the internal mass damper. In order to balance the damper pulley as a whole, the damper pulley is rotated at high speed and the vibration displacement caused by the imbalance of the damper pulley is measured. A damper pulley balance comprising: a calculation step for calculating a balance amount and an unbalance direction; and a damper pulley balance correction step for correcting the overall imbalance of the damper pulley by processing the damper pulley based on the calculation results. How to take it.