JP2006275637A - Device and method for measuring engine balance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method for measuring engine balance precisely measuring balance of an engine. <P>SOLUTION: The device 1 for measuring engine balance is provided with: an engine support means 2 supporting the engine 10 and permitting it to vibrate; an external driving means 3 driving the engine; a coupling means 4 coupling the output shaft 10a of the engine and a driving shaft 3a of the external driving means to be incapable of being relatively rotated; an axial line shift amount detection means 5 detecting the shift amount between the axial line of the output shaft and the axial line of the driving shaft; a vibration detection means 6 detecting the vibration of the engine driven by the external driving means in the state in which it is supported by the engine support means so as to be capable of vibrating; and an engine balance calculation means 7 calculating the balance of the engine on the basis of the shift amount between the axial line of the output shaft and the axial line of the driving shaft detected by the axial line shift amount detection means, and of the vibration of the engine detected by the vibration detection means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for measuring balance of an engine.

It is important to reduce engine vibration from the viewpoint of preventing noise during driving and improving quietness. An engine balance measuring device is known as a device for measuring such engine vibration, that is, engine balance.
In relation to this, as a method of correcting the balance of the pulley fixed to the output shaft of the engine, a method described in Patent Document 1 is known.

  A conventional general engine balance measuring device drives a stand that supports the engine so that the engine can vibrate and an engine fixed to the stand from the outside (more precisely, the output shaft of the engine is driven to rotate from the outside). A motor, a sensor (mainly an acceleration sensor) provided on the gantry, and a control device that calculates the balance of the engine based on a signal detected by the sensor.

  An engine balance measurement connecting device (hereinafter, abbreviated as “connecting device” as appropriate) is provided at the tip of the drive shaft of the external drive means of the engine balance measuring device, and the output of the engine by the connecting device. The shaft and the drive shaft of the external drive means are connected so as not to rotate relative to each other, that is, integrally rotate.

  As such a connecting device, the one shown in FIG. 7 is known. As another connecting device, connecting devices described in Patent Document 2 and Patent Document 3 are known.

As shown in (Equation 1) below, the total unbalance amount (UBt) calculated by the engine balance measuring device is the sum of the engine unbalance amount (UBe) and the engine balance measuring device unbalance amount (UBd). (More precisely, a vector sum).
UBt = UBe + UBd (Formula 1)
Therefore, it is desirable to make the unbalance amount (UBd) of the engine balance measuring device as small as possible from the viewpoint of accurately measuring the unbalance amount (UBe) of the engine.
Here, the unbalance amount (UBd) of the engine balance measuring device uses the amount of deviation (X) between the axis of the output shaft of the engine and the axis of the drive shaft of the external drive means, and the weight (M) of the coupling device. Generally, it is represented by the following (Formula 2).
UBd = (X / 2) × M (Formula 2)
JP-A-62-288744 JP-A-10-332540 Japanese Patent Laid-Open No. 11-14503

However, the conventional engine balance measuring device has the following problems.
The connecting device 104 of the conventional engine balance measuring apparatus shown in FIG. 7 includes a substantially disc-shaped body portion 104a provided at the tip of a drive shaft 103a of a motor as an external drive means, and a peripheral edge of a surface 104b of the body portion 104a. Are provided on the inner peripheral surface of the ring portion 104c, and the inner peripheral engagement teeth 104d, 104d,. The output shaft 110a of the engine and the drive shaft 103a of the motor are made relatively to each other by engaging with the outer peripheral teeth 112a, 112a,... Formed on the outer peripheral portion of the drive plate 112 fixed to the output shaft 110a of the motor. The drive plate 112 is configured to be non-rotatably connected. However, since the drive plate 112 has a large diameter, the connection device 104 inevitably increases in size. KazuSatoshi value of M in the above (Equation 2) is increased.
Further, the dimensional accuracy between the inner peripheral engaging teeth 104d, 104d,... Of the connecting device 104 and the outer peripheral teeth 112a, 112a,... Of the drive plate 112 is determined when the connecting device 104 and the drive plate 112 are connected. Therefore, it is necessary to allow a certain amount of play (backlash) in consideration of the workability of the engine, and therefore, the amount of deviation between the axis of the engine output shaft 110a and the axis of the motor drive shaft 103a, that is, X in the above (Expression 2) The value of increases.
Thus, when the conventional coupling device 104 shown in FIG. 7 is used, there is a problem that the unbalance amount (UBd) of the engine balance measuring device is large.

  Moreover, since the connection apparatus of patent document 2 and patent document 3 is a structure which a device structure is complicated, and is a structure which engages a protrusion with the hollow hole provided in the outer peripheral part vicinity of a drive plate, Inevitably, there is a problem in that the diameter of the connecting device and hence the weight increases.

  Thus, since the total unbalance amount (UBt) includes the unbalance amount (UBd) of the engine balance measuring device, it is difficult to accurately measure the engine unbalance amount (UBe).

  In view of the above situation, the present invention provides an engine balance measuring apparatus and an engine balance measuring method capable of accurately measuring an engine balance, more precisely, an engine unbalance amount.

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

That is, in claim 1,
Engine support means for supporting the engine so as to vibrate;
External drive means for driving the engine;
Connecting means for connecting the output shaft of the engine and the drive shaft of the external drive means in a relatively non-rotatable manner;
An axis deviation detecting means for detecting the deviation between the axis of the output shaft and the axis of the drive shaft;
Vibration detecting means for detecting vibrations of the engine driven by the external driving means in a state of being supported by the engine supporting means so as to vibrate;
The balance of the engine is calculated based on the amount of deviation between the axis of the output shaft and the axis of the drive shaft detected by the axis deviation detecting means and the vibration of the engine detected by the vibration detecting means. Engine balance calculating means for
It comprises.

In claim 2,
An engine support process for supporting the engine so as to vibrate;
An axis deviation detecting step for detecting an deviation between the axis of the output shaft of the engine and the axis of the drive shaft of the external drive means;
A connecting step of connecting the output shaft and the drive shaft so as not to be relatively rotatable;
A vibration detection step of driving the engine by the external drive means to detect vibration of the engine;
The balance of the engine is calculated based on the amount of deviation between the axis of the output shaft and the axis of the drive shaft detected in the axis deviation amount detection step and the vibration of the engine detected in the vibration detection step. An engine balance calculation process,
It comprises.

  As effects of the present invention, the following effects can be obtained.

  In claim 1, it is possible to accurately measure the balance of the engine.

  In claim 2, it is possible to accurately measure the balance of the engine.

Below, the whole structure of the engine balance measuring apparatus 1 which is one Embodiment of the engine balance measuring apparatus based on this invention is demonstrated using FIG.
The engine balance measuring device 1 is a device that measures the balance of the engine 10.
Here, “engine balance” in the present application is an index indicating the magnitude (more strictly speaking, a vector) of vibration generated when the engine is driven. The balance of the engine is represented by the engine unbalance amount (UBe). Generally, the smaller the value of the engine unbalance amount (UBe), the smaller the vibration of the engine and the better the silence.

  The engine balance measuring device 1 includes a gantry 2, a motor 3, a coupling device 4, a gap sensor 5, acceleration sensors 6 and 6, a control device 7, and the like.

Below, the detailed structure of the mount frame 2 is demonstrated using FIG.
The gantry 2 is an embodiment of the engine support means according to the present invention, and supports the engine 10 so as to vibrate.
Here, “support so as to be able to vibrate” means that vibration generated when the engine is driven by an external driving means described later is not absorbed by the ground or a structure (more precisely, the engine is driven). Vibration generated when the engine is driven by the external driving means described later), and the amount of vibration that is absorbed by the ground or structure is sufficiently smaller than the measurement accuracy of vibration). It means to support so as not to cause another vibration that may be a disturbance of vibration measurement due to the above.
The gantry 2 includes a fixed portion 21, support springs 22, 22, 22, 22 (not shown in FIG. 1), a vibrating portion 23, fixed arms 24, 24, 24, 24 (not shown in FIG. 1). Etc.
The fixing portion 21 is a structure that forms the lower half of the gantry 2 and is fixed to the ground or the structure.
The support springs 22, 22, 22, 22 are elastic bodies arranged at the four corners of the upper surface of the fixing portion 21.
The vibration part 23 is a structure that forms the upper half of the gantry 2, and is supported by the fixing part 21 via support springs 22, 22, 22, 22.
The fixed arms 24, 24, 24, 24 are provided on the upper surface of the vibration unit 23, and fix the engine 10 at a predetermined position on the upper surface of the vibration unit 23 in a predetermined posture.
In this way, the gantry 2 can support the engine 10 so as to vibrate.
The engine support means according to the present invention is not limited to the gantry 2 and may have other configurations as long as the engine is supported so as to vibrate.

Below, the detailed structure of the motor 3 is demonstrated using FIG.
The motor 3 is an embodiment of the external driving means according to the present invention, and drives the engine 10. The motor 3 is an electric motor, and rotates the drive shaft 3 a by energizing the motor 3.
The external drive means according to the present invention is not limited to the motor 3, and may be another configuration (for example, a hydraulic motor or the like) as long as the engine can be driven.
The motor 3 includes a rotary encoder 31 that detects the rotation angle (phase) of the drive shaft 3a.

Below, the detailed structure of the fixing member 11 is demonstrated using FIG.1, FIG.2 and FIG.4.
The fixing member 11 is a short, substantially cylindrical member fixed to the tip of the output shaft 10a (described in FIG. 2) of the engine 10, and the axis of the fixing member 11 and the axis of the output shaft 10a are substantially in a straight line. In such a manner, the center of one end face is fixed to the tip of the output shaft 10a. Further, a central fitting receiving portion 11 a is formed at the central portion of the other end surface of the fixing member 11. Therefore, the center fitting receiving portion 11a of the fixing member 11 is disposed on the axis of the output shaft 10a.
The center fitting receiving portion 11a of the present embodiment is formed of a substantially cylindrical protrusion, and a center fitting hole 11b is formed at the tip of the protrusion toward one end surface of the fixing member 11.
Further, screw holes 11c, 11c,... Are formed at positions on the other end face of the fixing member 11 around the center fitting receiving portion 11a.

Below, the detailed structure of the drive plate 12 is demonstrated using FIG. 2 and FIG.
The drive plate 12 is a substantially disk-shaped member provided in an engine for a so-called AT (Automatic Transmission) vehicle, and is a member that transmits the driving force of the engine 10 to a transmission (not shown).
A through hole for penetrating the center fitting receiving portion 11a of the fixing member 11 is formed in a substantially central portion of the drive plate 12, and a screw hole is formed around the through hole. Further, outer peripheral teeth 12 a, 12 a... Are formed on the outer peripheral portion of the drive plate 12.
The bolts 13, 13... Pass through the screw holes formed in the drive plate 12 and are fastened to the screw holes 11 c, 11 c. In this way, the drive plate 12 can be fixed to the fixing member 11 by the bolts 13, 13.
In this embodiment, the drive plate 12 is fixed to the fixing member 11 fixed to the output shaft 10a by the bolts 13, 13,..., But the flywheel is fixed to the fixing member 11 as a so-called configuration. The present invention can also be applied to engines for MT (Manual Transmission) vehicles and hybrid vehicles.

Below, the detailed structure of the connection apparatus 4 is demonstrated using FIG.1, FIG.2, FIG.3 and FIG.
The coupling device 4 is an embodiment of the coupling means according to the present invention, and couples the output shaft 10a of the engine 10 and the drive shaft 3a of the motor 3 so that they cannot be rotated relative to each other (that is, can rotate together). To do.

The coupling device 4 is a short, substantially cylindrical member, and is fixed to the tip of the drive shaft 3 a of the motor 3.
A center fitting portion 41 is formed at a position on the axis line of the drive shaft 3 a of the motor 3 on the surface of the coupling device 4 facing the fixing member 11.
The center fitting part 41 of the present embodiment is composed of a substantially cylindrical hole 41a and a substantially cylindrical protrusion 41b protruding from the center of the hole 41a. The diameter of the hole 41a is the diameter of the protrusion of the center fitting receiving part 11a. The diameter of the protrusion 41b is substantially the same as the diameter of the central fitting hole 11b of the central fitting receiving portion 11a.
Further, peripheral edge fitting holes 42, 42... Are formed at positions around the center fitting part 41 on the surface of the coupling device 4 facing the fixing member 11.

  As shown in FIGS. 3 and 4, in a state in which the connecting device 4 connects the output shaft 10 a of the engine 10 and the drive shaft 3 a of the motor 3 so as not to be relatively rotatable (that is, to be integrally rotatable). The center fitting portion 41 of the connecting device 4 is fitted into the center fitting receiving portion 11a of the fixing member 11, and the peripheral portion fitting holes 42, 42, ... of the connecting device 4 are fastened to the fixing member 11, respectively. Fits on the heads of bolts 13.

As described above, the coupling device 4 of the present embodiment is
An output shaft 10a of the engine 10 in which the fixing member 11 is fixed, and the drive plate 12 or the flywheel can be fixed to the fixing member 11 by bolts 13, 13.
A drive shaft 3a of the motor 3;
A connecting device for connecting the non-rotatably
Fixed to the tip of the drive shaft 3a of the motor 3,
A center fitting portion 41 is formed at a position on the axis line of the drive shaft 3a of the motor 3 on the surface facing the fixing member 11,
A peripheral edge fitting hole 42, 42,... Is formed at a position around the center fitting part 41 on the surface facing the fixing member 11.
The center fitting part 41 is fitted to the center fitting receiving part 11a arranged on the axis of the output shaft 10a in the fixing member 11,
The peripheral edge fitting holes 42, 42,... Are fitted into the heads of the bolts 13, 13,.

Such a configuration has the following effects.
First, the coupling device 4 of the present embodiment has peripheral edge fitting holes 42, 42,... Arranged around the center fitting part 41 arranged on the axis of the drive shaft 3a of the motor 3. .. Are fitted to the heads of the bolts 13, 13... Fastened to the fixing member 11, and the diameter thereof can be reduced as compared with the conventional coupling device 104 shown in FIG. Therefore, it is possible to suppress the weight of the coupling device 4, that is, the value of M in the above (Expression 2).
Secondly, in the coupling device 4 of the present embodiment, the center fitting portion 41 arranged on the axis of the drive shaft 3a of the motor 3 has a center fitting receiver in which the fixing member 11 is arranged on the axis of the output shaft 10a. Since it fits in the portion 11a, the axis of the output shaft 10a of the engine 10 and the axis of the drive shaft 3a of the motor 3 are substantially in a straight line. Therefore, it is possible to suppress the deviation amount between the axis of the output shaft 10a of the engine 10 and the axis of the drive shaft 3a of the motor 3, that is, the value of X in the above (Expression 2).
Strictly speaking, since the center fitting portion 41 is fitted to the center fitting receiving portion 11a, there is also play (backlash) between the center fitting portion 41 and the center fitting receiving portion 11a. Like the conventional coupling device 104 shown in FIG. 7, the outer peripheral teeth 112a, 112a,... Formed on the outer peripheral portion of the large-diameter drive plate 112 are the inner peripheral engagement teeth 104d, 104d,.・ It is possible to set the play small compared to the case of engaging with.
Therefore, the coupling device 4 of the present embodiment can suppress the unbalance amount caused by the coupling device 4, that is, the unbalance amount (UBd) of the engine balance measuring device 1, and improve the accuracy of engine balance measurement. Contribute.

  Further, the configurations of the center fitting portion and the center fitting receiving portion according to the present invention are not limited to the center fitting portion 41 and the center fitting receiving portion 11a of the present embodiment, and the center fitting portion is an external drive source. If it is arranged on the axis of the drive shaft, the center fitting receiving part is arranged on the axis of the output shaft of the engine, and one of the center fitting part and the center fitting receiving part is fitted to the other, the other It may be configured.

Below, the detailed structure of the gap sensor 5 is demonstrated using FIG. 1 and FIG.
The gap sensor 5 is an embodiment of the axis deviation amount detecting means according to the present invention, and the deviation amount between the axis line of the output shaft 10a and the axis line of the drive shaft 3a, that is, X in the above (Equation 2). It is to detect.
The gap sensor 5 includes a body member 50, a first distance sensor 51, a second distance sensor 52, and the like.

The body member 50 is a member constituting the structure of the gap sensor 5, and a first distance sensor 51 is provided at one end and a second distance sensor 52 is provided at the other end.
As shown in FIG. 6, the body member 50 has a projection 41 b of the center fitting portion 41 of the coupling device 4 fitted partway into the center fitting hole 11 b of the center fitting receiving portion 11 a of the fixing member 11, and a bolt .. Are not fitted in the peripheral edge fitting holes 42, 42..., The first distance sensor 51 is opposed to the outer peripheral surface of the coupling device 4, and the second distance sensor 52 is a fixing member. 11 is arranged so as not to interfere with the coupling device 4, the fixing member 11, the drive plate 12, the bolts 13, 13,.

The first distance sensor 51 is a sensor that detects the distance between the first distance sensor 51 itself and the outer peripheral surface of the coupling device 4.
The second distance sensor 52 is a sensor that detects the distance between the second distance sensor 52 itself and the outer peripheral surface of the center fitting receiving portion 11 a of the fixing member 11.

  Specific examples of the first distance sensor 51 and the second distance sensor 52 include a contact-type sensor using a non-contact type sensor such as an ultrasonic sensor, an optical sensor, a pneumatic sensor, a capacitance sensor, a eddy current sensor, or a potentiometer. And the like.

  Further, the axis deviation amount detecting means according to the present invention is not limited to the gap sensor 5 of the present embodiment, and one of the first distance sensor 51 and the second distance sensor 52 is omitted, and the body member 50 in which the sensor is omitted. Between the axis of the output shaft 10a and the axis of the drive shaft 3a, such as a configuration in which the end of the shaft is in contact with the outer peripheral surface of the corresponding connecting device 4 or the outer peripheral surface of the center fitting receiving portion 11a of the fixing member Other configurations may be used as long as the deviation amount can be detected.

Below, the detailed structure of the acceleration sensor 6 is demonstrated using FIG.
The acceleration sensors 6 and 6 are an embodiment of the vibration detecting means according to the present invention. The acceleration sensors 6 and 6 detect vibrations of the engine 10 driven by the motor 3 while being supported by the gantry 2 so as to vibrate. To do.
The acceleration sensors 6 and 6 according to the present embodiment are arranged before and after the side surface of the gantry 2, respectively. However, the number and arrangement of the vibration detection means according to the present invention are particularly limited as long as the vibration of the engine 10 can be detected. It is not limited. In this embodiment, the acceleration sensor is used as the vibration detecting means according to the present invention. However, another sensor such as a piezoelectric element may be used.

  Below, the detailed structure of the control apparatus 7 is demonstrated using FIG.

The control device 7 is a device that controls the operation of each part constituting the engine balance measuring device 1.
The control device 7 of the present embodiment has a function as an engine balance calculation means for calculating the balance of the engine in addition to the function of controlling the operation of each part constituting the engine balance measurement device 1.
The control device 7 includes a control unit 71, an input unit 72, a display unit 73, and the like.

The control unit 71 is connected to the motor 3 and can control the operation (rotation and stop) of the motor 3.
The controller 71 is connected to the rotary encoder 31 and can acquire information related to the rotation angle of the drive shaft 3 a of the motor 3 detected by the rotary encoder 31.
The control unit 71 is connected to the first distance sensor 51 and the second distance sensor 52 of the gap sensor 5, and the distance between the first distance sensor 51 detected by the first distance sensor 51 and the outer peripheral surface of the coupling device 4. And information related to the relationship between the second distance sensor 52 detected by the second distance sensor 52 and the distance between the outer peripheral surface of the central fitting receiving portion 11a of the fixing member 11 are acquired. It is possible.
The control unit 71 is connected to the acceleration sensors 6 and 6 and can acquire information related to the vibration of the engine 10 detected by the acceleration sensors 6 and 6.

The control unit 71 is a storage unit for storing various programs such as a program for operating the motor 3, a program for measuring engine balance (calculation of engine balance), which will be described later, and a developing unit for developing the program. Computation means for performing predetermined computation according to the program and the like, storage means for storing the result of quenching quality evaluation and the like, which will be described later, are provided.
More specifically, the control unit 71 may be configured such that a CPU, ROM, RAM, HDD, or the like is connected by a bus, or may be configured by a one-chip LSI or the like.
The control unit 71 may be a dedicated product, but can also be achieved by using a commercially available personal computer or workstation.

The input unit 72 is used by an operator or the like to input data related to the operation of the engine balance measuring device 1 or measurement of the engine balance to the control unit 71.
The input unit 72 may be a dedicated product, but can also be achieved using a commercially available keyboard, touch panel, or the like.

The display unit 73 displays data input from the input unit 72, engine balance measurement results, and the like.
The display unit 73 may be a dedicated product, but can also be achieved using a commercially available monitor, liquid crystal display, or the like.

Below, the Example of the engine balance measuring method based on this invention is described using FIG.
The embodiment of the engine balance measurement method according to the present invention includes an engine support process 1000, an axis deviation amount detection process 2000, a connection process 3000, a vibration detection process 4000, an engine balance calculation process 5000, and the like.

  The engine support process 1000 is a process of supporting the engine 10 so as to vibrate.

As shown in FIG. 1, in the engine support process 1000, the engine 10 is supported so as to be able to vibrate by being fixed at a predetermined position on the upper surface of the vibration portion 23 of the gantry 2 in a predetermined posture.
When the engine support process 1000 is completed, the process shifts to an axial deviation amount detection process 2000.

  The axis deviation amount detection step 2000 is a step of detecting a deviation amount between the axis of the output shaft 10 a of the engine 10 and the axis of the drive shaft 3 a of the motor 3.

As shown in FIG. 6, in the axial deviation amount detection step 2000, the protrusion 41b of the center fitting portion 41 of the coupling device 4 is fitted into the center fitting hole 11b of the center fitting receiving portion 11a of the fixing member 11 partway. And the bolts 13, 13... Are not fitted in the peripheral edge fitting holes 42, 42.
Next, the first distance sensor 51 of the gap sensor 5 is disposed at a position facing the outer peripheral surface of the coupling device 4, and the second distance sensor 52 is disposed at a position facing the outer peripheral surface of the center fitting receiving portion 11 a of the fixing member 11. Then, by rotating the drive shaft 3 a of the motor 3, the coupling device 4 is rotated 360 degrees relative to the fixing member 11.
Then, while the coupling device 4 rotates 360 degrees relative to the fixing member 11, the control unit 71 of the control device 7 includes information related to the rotation angle of the drive shaft 3 a of the motor 3 detected by the rotary encoder 31, Information related to the relationship between the distance between the first distance sensor 51 detected by the first distance sensor 51 and the outer peripheral surface of the coupling device 4 and the second distance sensor 52 detected by the second distance sensor 52 are fixed. Information on the relationship with the distance from the outer peripheral surface of the center fitting receiving portion 11a of the member 11 is acquired.
When the axis deviation detecting step 2000 is completed, the process proceeds to the connecting step 3000.

The connection step 3000 is a step of connecting the output shaft 10a of the engine 10 and the drive shaft 3a of the motor 3 so as not to be relatively rotatable.
As shown in FIG. 3 and FIG. 4, in the connecting step 3000, the protrusion 41 b of the center fitting portion 41 of the connecting device 4 is fitted into the center fitting hole 11 b of the center fitting receiving portion 11 a of the fixing member 11 to the back. .. Are fitted into the peripheral edge fitting holes 42.
When the connection process 3000 is completed, the process proceeds to the vibration detection process 4000.

The vibration detection step 4000 is a step of detecting the vibration of the engine 10 by driving the engine 10 by the motor 3.
In the vibration detection process 4000, the engine 10 supported by the gantry 2 so as to vibrate is driven by the motor 3.
At this time, the control unit 71 of the control device 7 acquires information related to the rotation angle of the drive shaft 3 a of the motor 3 detected by the rotary encoder 31 and information related to the vibration of the engine 10 detected by the acceleration sensors 6 and 6. To do.
When the vibration detection process 4000 ends, the process proceeds to the engine balance calculation process 5000.

The engine balance calculation step 5000 includes a deviation amount between the axis of the output shaft 10a of the engine 10 and the axis of the drive shaft 3a of the motor 3 detected in the axis deviation detection step 2000, and the engine 10 detected in the vibration detection step 4000. This is a step of calculating the balance of the engine 10 based on this vibration.
In the engine balance calculation step 5000, the control unit 71 of the control device 7 sets the mass M of the connecting device 4 set in advance and the drive shaft of the motor 3 detected by the rotary encoder 31 acquired in the axis deviation detection step 2000. 3a, information relating to the rotation angle, information relating to the distance between the first distance sensor 51 detected by the first distance sensor 51 and the outer peripheral surface of the coupling device 4, and information detected by the second distance sensor 52. The axis of the output shaft 10a of the engine 10 and the driving of the motor 3 calculated based on the information relating to the relationship between the distance between the second distance sensor 52 and the outer peripheral surface of the center fitting receiving portion 11a of the fixing member 11 Based on the deviation amount X of the shaft 3a from the axis, the unbalance amount (UBd) of the engine balance measuring device 1 shown in (Expression 2) is calculated.
Further, the control unit 71 of the control device 7 calculates the total unbalance amount (UBt) shown in the above (Equation 1) based on the information related to the vibration of the engine 10 acquired in the vibration detection process 4000.
Based on the unbalance amount (UBd) and the total unbalance amount (UBt) of the engine balance measuring device 1, the control unit 71 of the control device 7 determines the engine unbalance amount (UBe) shown in the above (Equation 1). ) Is calculated.

The operation performed by the control unit 71 of the control device 7 in the engine balance calculation step 5000 is performed based on an engine balance calculation program stored in the storage unit of the control unit 71.
Therefore, the control unit 71 of the control device 7 storing the engine balance calculation program is an embodiment of the engine balance calculation means according to the present invention.

As described above, the engine balance measuring apparatus 1 of the present embodiment is
A gantry 2 that supports the engine 10 so as to vibrate;
A motor 3 for driving the engine 10;
A connecting device 4 for connecting the output shaft 10a of the engine 10 and the drive shaft 3a of the motor 3 so as not to be relatively rotatable;
A gap sensor 5 that detects the amount of deviation between the axis of the output shaft 10a of the engine 10 and the axis of the drive shaft 3a of the motor 3;
Acceleration sensors 6 and 6 for detecting vibrations of the engine 10 driven by the motor 3 while being supported by the gantry 2 so as to vibrate;
Based on the amount of deviation between the axis of the output shaft 10a of the engine 10 detected by the gap sensor 5 and the axis of the drive shaft 3a of the motor 3, and the vibration of the engine 10 detected by the acceleration sensors 6 and 6, the engine 10 Engine balance calculation means (control unit 71 storing an engine balance calculation program) for calculating the balance of
It comprises.
With this configuration, it is possible to accurately measure the balance (UBe) of the engine 10 by eliminating the influence of the unbalance amount (UBd) of the engine balance measuring apparatus 1.

Also, the engine balance measurement method of this embodiment is
An engine support process 1000 for supporting the engine 10 so as to vibrate;
An axis deviation detecting step 2000 for detecting the deviation between the axis of the output shaft 10a of the engine 10 and the axis of the drive shaft 3a of the motor 3;
A connecting step 3000 for connecting the output shaft 10a of the engine 10 and the drive shaft 3a of the motor 3 in a relatively non-rotatable manner;
A vibration detection step 4000 for driving the engine 10 by the motor 3 and detecting the vibration of the engine 10;
Based on the amount of deviation between the axis of the output shaft 10a of the engine 10 detected in the axis deviation detection step 2000 and the axis of the drive shaft 3a of the motor 3, and the vibration of the engine 10 detected in the vibration detection step 4000. An engine balance calculation step 5000 for calculating the balance of the engine 10;
It comprises.
With this configuration, it is possible to accurately measure the balance (UBe) of the engine 10 by eliminating the influence of the unbalance amount (UBd) of the engine balance measuring apparatus 1.

  In the present embodiment, the configuration shifts to the connecting step 3000 after the axial line deviation detecting step 2000 is completed. If the amount of deviation between the axis of the output shaft 10a of the engine 10 and the axis of the drive shaft 3a of the motor 3 can be detected in this state, the configuration shifts to the axis deviation detection step 2000 after the connection step 3000 is completed. Is also possible.

In the present embodiment, the connecting device 4 that can reduce the unbalance amount (UBd) of the engine balance measuring device is used. However, the connecting device according to the present invention is not limited to this, and the output shaft of the engine, the motor As long as the drive shaft can be connected to the drive shaft so as not to be relatively rotatable (that is, to be rotatable integrally), it is possible to use a connecting device having another configuration including a conventional connecting device.
However, from the viewpoint of improving the accuracy of engine balance measurement, it is desirable to use a coupling device having a small unbalance amount (UBd) of the engine balance measuring device, such as the coupling device 4 of this embodiment.

  Further, in this embodiment, when the output shaft 10a of the engine 10 and the drive shaft 3a of the motor 3 are connected so as not to be relatively rotatable by the connecting device 4, the drive plate 12 is connected to the fixing member 11 by the bolts 13, 13. The drive plate 12 is removed from the fixing member 11, and the output shaft 10a of the engine 10 and the motor 3 are driven by the connecting device 4 with the bolts 13, 13... Screwed to the fixing member 11. It is also possible to connect the shaft 3a so as not to be relatively rotatable. By doing so, it is possible to measure the balance of the engine with and without the drive plate 12 fixed. In addition, since the balance of the single drive plate 12 can be separately measured, the drive plate 12 is attached to the fixing member 11 so that the balance of the engine is in a good posture when the drive plate 12 is fixed. Is possible.

The figure which shows one Embodiment of the engine balance measuring apparatus which concerns on this invention. The perspective view which shows the non-connection state of one Embodiment of the connection apparatus which concerns on this invention. The perspective view which shows the connection state of one Embodiment of the connection apparatus which concerns on this invention. The side surface partial sectional view which shows the connection state of one Embodiment of the connection apparatus which concerns on this invention. The flowchart which shows one Embodiment of the engine balance measuring method which concerns on this invention. The side surface partial sectional view which shows the state at the time of the deviation | shift amount detection of the axis line of the output shaft of an engine, and the axis line of the drive shaft of a motor. Side surface partial sectional drawing which shows the conventional connection apparatus.

Explanation of symbols

1 Engine balance measuring device 2 Mount (engine support means)
3 Motor (external drive means)
3a Drive shaft 4 Connecting device (connecting means)
5 Gap sensor (Axis deviation detection means)
6 Acceleration sensor (vibration detection means)
10 Engine 10a Output shaft

Claims (2)

Engine support means for supporting the engine so as to vibrate;
External drive means for driving the engine;
Connecting means for connecting the output shaft of the engine and the drive shaft of the external drive means in a relatively non-rotatable manner;
An axis deviation detecting means for detecting the deviation between the axis of the output shaft and the axis of the drive shaft;
Vibration detecting means for detecting vibrations of the engine driven by the external driving means in a state of being supported by the engine supporting means so as to vibrate;
The balance of the engine is calculated based on the amount of deviation between the axis of the output shaft and the axis of the drive shaft detected by the axis deviation detecting means and the vibration of the engine detected by the vibration detecting means. Engine balance calculating means for
An engine balance measuring device comprising: An engine support process for supporting the engine so as to vibrate;
An axis deviation detecting step for detecting an deviation between the axis of the output shaft of the engine and the axis of the drive shaft of the external drive means;
A connecting step of connecting the output shaft and the drive shaft so as not to be relatively rotatable;
A vibration detection step of driving the engine by the external drive means to detect vibration of the engine;
The balance of the engine is calculated based on the amount of deviation between the axis of the output shaft and the axis of the drive shaft detected in the axis deviation amount detection step and the vibration of the engine detected in the vibration detection step. An engine balance calculation process,
An engine balance measurement method comprising: