JPH07306112A - Balance tester - Google Patents

Abstract

PURPOSE:To provide a tester, which can set a plurality of unbalances by the simple operation in the balance tester for a body under test, which is required to keep the adequate unbalance for a crank shaft for three-cylinder engine. CONSTITUTION:A ship-type vibrating stage 4 is suspended from a frame 10 of a tester with springs 8. A first dummy shaft 11 having a weight 11a as the first unbalance member and a second dummy shaft 12 having a weight 12a as the second unbalance member are attached to the vibration stage 4. The first kind of the unbalance, under which a one-position clutch 14 is separated and only the first dummy shaft 11 is rotated, and the second kind of the unbalance, under which the one-position clutch 14 is connected and both dummy shafts 11 and 12 are rotated, can be set by the simple operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention eliminates imbalance in a crankshaft used in, for example, an in-line 3-cylinder engine, an in-line 5-cylinder engine, a V-type 6-cylinder engine, or a V-type 8-cylinder engine. Rather, the present invention relates to an equilibrium tester for an object to be tested that requires a specified unbalance to be left with high accuracy.

[0002]

2. Description of the Related Art An engine having three or less cylinders and four
Even for engines with more than cylinders, depending on the arrangement of the crankpin orientation, if the crankshaft alone is perfectly balanced,
A large vibration occurs because the inertial forces of the piston and other reciprocating masses are not balanced. Therefore, in such cases, by leaving an appropriate imbalance on the crankshaft,
A part of the inertial force due to the reciprocating mass is canceled.

For this reason, conventionally, as shown in FIG. 4, a dummy weight (an unbalance member corresponding to the opposite of the specified unbalance to be left) 3 is halved at the position of the crank pin 2 of the crankshaft 1. Attach it by holding it, place it on a general balance tester in this state so that the imbalance becomes zero, then remove the dummy weight 3 and set the specified imbalance on the crankshaft 1. Was taken.

Although this method has an advantage that an unbalance test can be performed by a general balance tester, it is inefficient because it is necessary to attach and remove dummy weights to and from each crankshaft. There is inconvenience.

Therefore, as shown in FIG.
The crankshaft 1 as a test object and the dummy shaft 5 having the dummy weights 3 are rotatably attached to the boat-shaped vibrating table 4 via bearings 9a and 9b, respectively. 1 and the dummy shaft 5 are synchronously rotated by the rotary drive device 6 so that the imbalance becomes zero, whereby the crankshaft 1
A testing machine was proposed in which the specified imbalance was set.

In FIG. 4, reference numeral 6a is a drive shaft, 6b is a gear group, reference numerals 7a and 7b are universal joints, and reference numeral 8 is a spring for suspending the boat vibration table on the machine frame 10 of the tester. Shows.

[0007]

This tester does not require the work of attaching dummy weights to each crankshaft (test object), but it does not require the work of another type of test object (test objects having different prescribed imbalances). For body), dummy shaft 5
There is the inconvenience of having to change the unbalanced member attached to the. In addition to this, using a general balance tester, you can also measure the imbalance provided at a predetermined position and adjust the imbalance of the DUT so that it is the specified imbalance. Proposed.

However, in this method, it is difficult to ensure the accuracy when the ratio of the specified unbalance to the allowable error is large (the measurement error of the balance tester tends to be proportional to the unbalance amount). Therefore, there is an inconvenience that it is limited to the case where the ratio of the prescribed imbalance and the allowable error is relatively small. It is an object of the present invention to provide a balance testing machine that solves the above-mentioned disadvantages of the prior art.

[0009]

In order to achieve the above object, a balance testing machine according to a first aspect of the present invention comprises a rotary drive unit, a boat vibration table, and the boat vibration table incorporated into the rotation table. A first dummy shaft is attached to the boat-shaped vibrating table so that it can be rotated in synchronization with the DUT by the rotary drive unit. , A first unbalance member that forms an unbalance corresponding to the reverse of the unbalance to be left in the device under test of the first type is attached to the first dummy shaft, and the above-mentioned device under test is attached via a one-position clutch. A second dummy shaft is attached to the boat-shaped vibrating table so that it can rotate in synchronization with the body, and the second dummy shaft is combined with the first unbalanced member of the first dummy shaft to form a first dummy member. Two
A second unbalance member that forms an unbalance corresponding to the reverse of the unbalance that should be left on the type under test is attached.

The balance testing machine according to claim 2 is
The balance tester according to claim 1, wherein the spindle is provided with a first unbalance member that forms an unbalance corresponding to the reverse of the unbalance to be left on the DUT of the first type. The spindle is characterized in that it constitutes the first dummy shaft.

Further, the balance testing machine according to the third aspect of the invention is a rotary drive unit, a boat-shaped vibrating table, and a spindle which is incorporated in the boat-type vibrating table and is connected to the rotary drive unit and on which a device under test is mounted. In addition, a plurality of dummy shafts are attached to the boat-shaped vibrating table so as to be able to rotate in synchronization with the DUT by the rotation driving device, and a plurality of types to be left on the DUT on each dummy shaft. The above-mentioned dummy shafts are connected to the rotary drive device via the one-position clutches, respectively.

[0012]

In the balance testing machine of the present invention described above, a plurality of dummy shafts corresponding to a plurality of types of imbalances are attached to the boat-shaped vibrating table. By operating the clutch, it can be rotated in synchronization with the DUT.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic front view of a balance testing machine as a first embodiment, and FIG. 2 is a schematic front view of a balance testing machine as a second embodiment. 3 is a schematic side view showing a modified example of the dummy shaft drive mechanism. In FIGS. 1 to 3, the same reference numerals as those in FIGS. 4 and 5 indicate almost the same members.

First, a first embodiment will be described with reference to FIG. The equilibrium tester of the first embodiment shown in FIG. 1 also has a boat-shaped vibrating table 4, which is stipulated in the crankshaft 1 as the DUT rotatably supported on the boat-shaped vibrating table 4 via bearings 9b. The unbalance is set, and the first dummy shaft 11 and the second dummy shaft 12 are bearings on the boat-shaped vibrating table 4.
It is rotatably mounted via 13. The first dummy shaft 11 is connected to the first drive gear shaft 6c of the rotary drive device 6 via a universal joint 7a.

The second dummy shaft 12 is connected to the first dummy shaft 11 via a one-position clutch 14. The second drive gear shaft 6d of the rotary drive device 6 is connected to a spindle 4a, which is incorporated into the boat vibration table 4 via a universal joint 7b and on which the crankshaft 1 as the DUT is mounted.

A weight 11a as a first unbalanced member is attached to the first dummy shaft 11. The weight 11a corresponds to the reverse of the first type of imbalance that should be left on the crankshaft 1. Further, a weight 12a serving as a second unbalanced member is attached to the second dummy shaft 12. The weight 12a corresponds to the reverse of the second type of unbalance that should be left on the crankshaft 1 when combined with the first unbalance by the weight 11a as the first unbalance member. .

Also in this embodiment, the boat-shaped vibrating table 4 is suspended by the spring 8 on the machine frame 10 of the testing machine, and the crankshaft 1 as the DUT is mounted on the boat-shaped vibrating table 4 by bearings 9b.
Is rotatably supported via the spindle 4
It is connected to the second drive gear shaft 6d of the drive device 6 via a and the universal joint 7b. Reference numeral 15 indicates a motor as a drive source.

In the above structure, in the case of the crankshaft requiring the first type of imbalance, the one-position clutch 14 is arranged so that only the first dummy shaft 11 rotates.
The crankshaft 1 is synchronously rotated with the first dummy shaft 11 by the rotation driving device 6 to balance so that the vibration of the boat vibration table 4 becomes zero. In the case of the crankshaft requiring the second type of imbalance, the one-position clutch 14 is connected so that the first dummy shaft 11 and the second dummy shaft 12 rotate together, and the rotary drive device 6 is used. The crankshaft 1 and the first and second dummy shafts
11 and 12 are rotated synchronously and balanced so that the vibration of the boat vibration table 4 becomes zero.

In this way, the one-position clutch
It is possible to deal with two kinds of imbalances only by 14 operations. As shown in FIG. 3, the first and second dummy shafts 11 and 12 are attached in parallel with the boat-shaped vibrating table 4, and a timing belt is provided between (the sprocket of) the dummy shafts and (the sprocket of) the spindle 4a. 16 may be wound so that the first and second dummy shafts 11 and 12 are belt-driven.

Further, although two dummy shafts are attached in this embodiment, the third and fourth dummy shafts and the second and second dummy shafts are attached.
It goes without saying that by providing the third one-position clutch, it is possible to deal with the imbalances of the third and fourth types.

Next, a second embodiment will be described with reference to FIG.
In the balance testing machine of this embodiment, the spindle 4a incorporated in the boat-shaped vibrating table 4 is attached with the weight 11a as the first unbalance member, and the spindle 4a constitutes the first dummy shaft. It is different from the balance testing machine of the first embodiment in points. The second dummy shaft 12 is connected to the first drive gear shaft 6c of the rotary drive device 6 via a one-position clutch 14.

With the above construction, in the case of the second embodiment, the spindle 4a can also serve as the first dummy shaft, and there is an advantage that the overall construction can be simplified. The operation and effect are not different from those of the first embodiment. In the above-mentioned first and second embodiments, one of the tests of the second kind of imbalance is the first and second dummy shafts.
Although the configuration is performed by rotating both 11 and 12, similar effects can be obtained even with the following configuration as a modified example.

That is, a first dummy shaft is arranged so that it can rotate in synchronization with the device under test via the first one-position clutch, and the first dummy shaft is provided with the first dummy shaft. Attach an unbalance member that corresponds to the reverse of the specified unbalance that should be left on the body. Further, a second dummy shaft that can rotate in synchronization with the DUT via the second one-position clutch is provided, and the second dummy shaft is provided with a prescribed rule to be left for the DUT of the second type. An unbalance member corresponding to the opposite of unbalance is attached.

In the case of the first type of DUT,
The first one-position clutch is connected so that only the first dummy shaft rotates, and the boat-shaped vibration table is balanced so that the vibration is zero. In the case of the second type of DUT, the second one-position clutch is connected so that only the second dummy shaft rotates, and the boat-shaped vibration table is balanced so that the vibration is zero.

In this way, in this modification,
At the time of the balance test, there is always one rotating dummy shaft, which is advantageous in terms of noise and labor saving. The "one-position clutch" in each of the above-mentioned embodiments means a clutch that has a mechanism capable of connecting / disconnecting rotary motion and can be engaged only in a certain phase relationship. When the one-position clutch is of the electromagnetic type, it can be operated remotely or automatically, leading to higher efficiency and labor saving.

[0026]

As described above in detail, according to the balance testing machine of the present invention, it is possible to change the unbalance (dummy) to be left on the DUT by switching the one-position clutch. .

If this one-position clutch is replaced by an electromagnetic clutch, the imbalance that should be left on the device under test can be switched by an electric signal, and remote or automatic switching is possible.

[Brief description of drawings]

FIG. 1 is a schematic front view of a balance testing machine as a first embodiment of the present invention.

FIG. 2 is a schematic front view of a balance testing machine as a second embodiment.

FIG. 3 is a schematic side view showing a modified example of a dummy shaft drive mechanism.

FIG. 4 is an explanatory diagram of an example of a conventional unbalance test method.

FIG. 5 is a schematic front view of a conventional balance tester.

[Explanation of symbols]

 1 Crankshaft as DUT 3 Dummy weight 4 Boat vibrating table 4a Spindle 5 Dummy shaft 6 Rotation drive device 7a, 7b Universal joint 8 Spring 9a, 9b Bearing 10 Machine frame of test machine 11 First dummy shaft 11a 1st Weight as an unbalanced member of 12 12 Second dummy shaft 12a Weight as a second unbalanced member 13 Bearing 14 One-position clutch 15 Motor as drive source 16 Timing belt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Ideura 2-5020 Hironodai, Zama City, Kanagawa Prefecture Akashi Sagami Factory Co., Ltd. (72) Inventor Yuichi Minami 2-5020 Hironodai, Zama City, Kanagawa Prefecture Ceremony company Akashi Sagami Factory

Claims (3)

[Claims] 1. A balance testing machine comprising a rotary drive unit, a boat-shaped vibration table, and a spindle mounted on the boat-shaped vibration table and connected to the rotary drive unit and on which a device under test is mounted. The vibrating table is configured so that it can be rotated in synchronization with the DUT by the rotation driving device.
A dummy shaft is attached to the first dummy shaft, and a first unbalance member that forms an unbalance corresponding to the reverse of the unbalance to be left on the DUT of the first type is attached to the first dummy shaft. A second dummy shaft is attached to the boat-shaped vibrating table so as to be able to rotate in synchronization with the DUT via the first dummy shaft and the first dummy shaft to the first dummy shaft.
A second unbalanced member which is combined with the first unbalanced member of the dummy shaft to form an unbalance corresponding to the reverse of the unbalance to be left on the DUT of the second type. A unique balance testing machine. 2. The balance tester according to claim 1, wherein the spindle has a first unbalance member that forms an unbalance corresponding to an inverse of the unbalance to be left on the DUT of the first type. Is attached, and the spindle constitutes the first dummy shaft. 3. A balance testing machine comprising a rotary drive unit, a boat vibration table, and a spindle mounted on the boat vibration table, connected to the rotary drive unit, and having a test object mounted thereon. A plurality of dummy shafts are attached to the vibrating table so as to be able to rotate in synchronization with the DUT by the rotation drive device. Each unbalance member forming a corresponding unbalance is attached,
A balance testing machine, wherein each of the dummy shafts is connected to the rotary drive device via a one-position clutch.