JPH0852642A - Unbalance correcting device for crankshaft - Google Patents

Abstract

PURPOSE:To form a rough balance hole and a finish balance hole by a single set of device. CONSTITUTION:Positioning members 13, 15 are arranged respectively under the first/second crank pins 5, 7 of a rotatably supported crankshaft 1, to integrally swivel these positioning members with a journal center O serving as the center between a rough machining position A and a finish machining position B. While swiveling both the positioning members 13, 15, after the first crank pin 5 is engaged with a contact part 35 of the first positioning member 13, the second crank pin 7 is engaged with a contact part 37 of the second positioning member 15, to perform positioning in four positions of the crankshaft 1. After positioning in each position, a balance hole is formed in webs 9, 11 by a drill 21 arranged toward the journal center O.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unbalance correction device for punching a web of a crankshaft when correcting an unbalance of the crankshaft.

[0002]

2. Description of the Related Art After a crankshaft, which is a component of an engine, is manufactured, it is necessary to correct an imbalance in order to suppress vibrations generated when the engine is driven. As shown in FIG. 6, the unbalance correction is performed on the first web (52) and the second web (53) of the crankshaft (51).
This is performed by forming four balance holes (55a) (55b) (56a) (56b) toward the center of the journal (O). Normally, each balance hole (55a) (55
b) (56a) and (56b) are formed in two stages of rough machining and finish machining (rough machining holes (55a) and (56a) are shown by solid lines, and finish machining holes (55b) and (56b)). Is indicated by a broken line).

The conventional imbalance correction procedure will be described below.

For the crankshaft (51), an unbalance amount is measured by a balancing device (not shown), and then the crankshaft (51) shown in FIG.
It is conveyed to the rough processing device (57). In this rough processing device (57), two types (for horizontal and vertical balance) of rough balance holes (55a) (56) are provided for each web (52) (53).
a) is formed. Specifically, first, as shown in FIG. 8A, the first crank pin (59) is pressed by a pressing member (not shown).
By pressing down, pin (59) to the first plate (60).
To support the crankshaft (51) from below and position it at the first roughing position. After the positioning is completed, a plurality of drills (62) arranged on the outer diameter side of each web (52) (53) are activated, and the first rough balance hole (55a) is provided at the free end of each web (52) (53). (For horizontal balance). Next, as shown in FIG. 2B, the second crank pin (63)
By pressing down to rotate the crankshaft (51),
The second plate (64) supports the second crank pin (63) to position the crankshaft (51) at the second roughing position. After this, the drill (62) is activated and each web (5
2) Form a second rough balance hole (56a) (for vertical balance) in (53).

Crankshaft (51) after rough machining
Is transported to a balancing device, the unbalance amount is remeasured, and then transported to a finishing device (not shown). This finishing device has the first and second plates (60 ').
Except for (64 '), the major part is the roughing machine (57: Fig. 7
(See) and the configuration is substantially the same. Both plates (60 ') (64') for finishing are finished balance holes (55b) (56
In order to make the formation position of b) different from that of the rough balance holes (55a) (56a), the height of the contact portion that contacts the crank pins (59) (63) should be set to that of the rough machining plates (60) (64). It is arranged differently from that.

In this finishing device, two types of finishing balance holes (55b) (55b) are formed in each web (52) (53) by the same procedure as in the roughing device. That is, FIG. 9 (a)
As shown in, the first plate (60 ') supports the first crank pin (59) to position the crankshaft (1) at the first finishing position, and the drill (62') finishes the first finishing. A balance hole (55b) is formed. Next, the second crank pin (63) is pressed to rotate the crank shaft (51), the second plate (64 ') is positioned at the second finishing position, and the drill (62') is used for the second finishing. Balance hole (56
b) is formed (FIG. 9B).

The plate (60) of the roughing machine (57)
(64) and the finishing machine plate (60 ') (64')
Are fixed to the machine bases of both devices.

[0008]

As described above, conventionally,
Since two processing devices, one for roughing and one for finishing, are installed side by side, a lot of space is wasted, and many transport steps are required, which is also wasteful in terms of time and cost.
Further, the reference position at the time of processing may be deviated between the rough processing and the finishing processing, and it has been difficult to obtain sufficient processing accuracy.

Therefore, the present invention is based on space, time,
It is an object of the present invention to provide a processing apparatus which can solve a cost problem and can accurately perform unbalance correction.

[0010]

[Means for Solving the Problems] To achieve the above object,
The device of the present invention includes a crank journal, a first crank pin and a second crank pin symmetrically arranged at an eccentric position around the center of the journal, and a first crank pin and a second crank pin extending in the radial direction from the crank journal, respectively. Is a device for correcting an imbalance of a crankshaft having a first web and a second web that sandwich the shaft from both sides in the axial direction.

A supporting device for rotatably supporting the crankshaft is arranged below the first crankpin and on a radial surface intersecting the crankpin, and a journal center is provided between a roughing position and a finishing position. A first positioning member that swings as a center, and a swinging motion that is disposed below the second crankpin and on a radial surface that intersects with the crankpin and that is integrated with the first positioning member and that is centered around the journal center. And a first pressing member which is arranged so as to be able to press the first crank pin and which holds the first crank pin in cooperation with the first positioning member at each of the roughing position and the finishing position. , A second pressing member that is arranged to be able to press the second crank pin and that holds the second crank pin in cooperation with the second positioning member at each of the rough processing position and the finishing processing position. And wood, and each of the free end of the first and second webs comprising a perforation means which is disposed toward the journal center.

[0012]

First, the crankshaft is rotatably supported by the supporting device, and the first positioning member and the second positioning member are arranged at the rough machining position. Next, when the first crank member is pressed by the first pressing member and the crank pin is brought into contact with the first positioning member, the first crank pin is held between the first positioning member and the first pressing member, and the crankshaft Are positioned at the first roughing position. In this state,
The piercing means is activated to form a first rough balancing hole at the free ends of the first and second webs.

Next, the second crank member is pressed by the second pressing member to rotate the crankshaft to bring the second crank pin into contact with the second positioning member. As a result, the crankshaft is positioned at the second rough machining position. ). Then, the piercing means is activated to form a second rough balance hole at the free ends of the first and second webs.

Next, both positioning members are integrally rocked to the finishing position. Then, as in the case of rough machining,
The first pressing member presses the first crank pin,
The crankshaft is positioned by contacting the positioning member (first finishing position), and the piercing means is activated to form the first finishing balance hole at the free ends of both webs.

Next, the second crank pin is pressed by the second pressing member to rotate the crank shaft, and the second crank pin is brought into contact with the second positioning member to position the crank shaft (second A finishing finishing position) and a second finishing balance hole are formed by the boring means.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is applied to a crankshaft for four cylinders, and an embodiment in that case will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, the crankshaft (1) is eccentrically arranged with the crank journal (3) axially offset at a symmetrical position about the center (O) of the journal. The pin (5) and the second crank pin (7) (two each are arranged), and the web (9) (which extends in the radial direction and connects the crank pin (5) (7) and the crank journal (3)). 11) consists of

The first crank pin (5) is coaxially arranged in the center of the crank shaft (1), while the second crank pin (7) sandwiches the first crank pin (5) from both sides in the axial direction. It is arranged coaxially.

In the following description, the web (9) that holds the first crank pin (5) from both sides in the axial direction will be referred to as "first."
The web (11), which holds the second crank pin (7) from both sides in the axial direction, will be referred to as the "second web".

The device of the present invention comprises a pair of positioning members (1) arranged below the first and second crank pins (5) (7).
3) (15), a pair of pressing members (17) (19) arranged above both crankpins (5) (7), and each web (9)
The main component is a drill (21) for making a hole in (11) (other drilling means may be used).

The positioning members (13) (15) are in the form of plates arranged on the radial surface, and are arranged below the first crank pin (5) and the second crank pin (7) adjacent to each other. There is.

The lower ends of both positioning members (13) (15) are
It is connected to the swing arm (27) via the connecting members (25) (25). At both ends of the swing arm (27), support arms (2
9) (29) are pivotally attached to this support arm (29) (2
The upper end of 9) is pivotally attached to horizontal support shafts (33) (33) rotatably supported by the machine frame (31). Horizontal support shaft (3
3) and (33) are arranged with their axes aligned with the center of the journal (O), so that both positioning members (13) (1)
As shown in FIG. 1, 5) is a solid line position A (rough processing position) and a chain double-dashed line position B centered on the journal center (O).
It can swing integrally with (finishing position).

As shown in FIG. 3, the upper end of the positioning member (13) (hereinafter referred to as the first positioning member) arranged below the first crank pin (5) is formed by obliquely cutting a corner of the rectangular plate. The first contact portion (35) is formed in a substantially semicircular shape on the upper end surface thereof. The first contact portion (35) is a position that can engage with the first crank pin (5) when the first positioning member (13) reaches the rough machining position (A) and the finishing machining position (B), respectively. Is formed in.

A positioning member (15) arranged below the second crank pin (7) (hereinafter referred to as a second positioning member).
Has a shape in which the first positioning member (13) is turned over as it is, and like the first positioning member (13), its upper corner portion is obliquely cut. Further, a semicircular second contact portion (37) is formed on the upper end surface thereof, and the second contact portion (37) is similar to the first contact portion (35) in the second positioning member. (15) is rough machining position (A) and finishing machining position (B)
Are formed at positions where they can be engaged with the second crank pins (7), respectively.

As shown in FIGS. 1 and 2, the pressing member (1
7) and (19) are configured to be swingable around a pair of rotating shafts P which are spaced apart in parallel with the center (O) of the journal. Both pressing members (17) and (19) are driven by an air cylinder (not shown) and can swing independently in the radial plane. Of these, one of the pressing members (17) (first pressing member) presses the first crank pin (5) downward to move the pin (5) to the first contact portion (1) of the first positioning member (13). 3
5), and the other pressing member (19) (second pressing member) presses the second crank pin (7) downward to move the pin (7) to the second positioning member (15). 2 contact part (3
Engage with 7).

First and second crankpins (5) (7)
Is pressed by contacting the pressing plates (37) (37) of both pressing members (17) (19), so that the crank pins (5) (7) are not damaged during this pressing. (37) (37)
Is made of a material softer than the crankpins (5) and (7), such as gun metal.

The drill (21) has the free ends of the webs (9) and (11) (the crank pins (5) attached to the webs (9) and (11)).
(This means the portion located on the outer diameter side when rotated around (7)), one on each of the outer diameter sides, for a total of 8
In this arrangement, the axis of each drill (21) is arranged on a horizontal plane passing through the center (O) of the journal. Each drill (2
1) is fixed to a stationary member (not shown), is independently driven to rotate by a rotary drive source (not shown), and is independently driven to slide horizontally by a slide drive source (not shown). The position of the drill (21) is the same as the conventional one (see FIG. 7).

The processing procedure by the apparatus of the present invention will be described below with reference to FIGS. 4 and 5.

First, prior to the unbalance correction, the crankshaft (1) is conveyed to a balancing device (not shown) to measure the unbalance. In the balancing device, the crankshaft (1) is rotated, and the resulting vibration is measured in two directions by the detectors arranged in the vertical direction and the horizontal direction.

After measuring the imbalance, the crankshaft (1) is conveyed to the processing device. Both ends of the conveyed crankshaft (1) are rotatably supported by supporting devices (bearings or the like) not shown.

In the state where the first positioning member (13) and the second positioning member (15) are arranged at the rough machining position (A),
The pressing member (17) is moved downward to press the first crank pin (5) to engage with the first contact portion (35) of the first positioning member (13) (FIGS. 4A and 5). (A)). This positions the crankshaft (1) at the first roughing position. After the positioning is completed, each drill (21) is activated to form the first rough balance hole (39a) at the free ends of the first web (9) and the second web (11). The depth of the hole (39a) at this time is set to such a depth that it can be erased in consideration of the previously measured horizontal unbalance amount.

Next, the second pressing member (19) is moved downward to press the second crank pin (7) and rotate the crank shaft (1). Eventually, the second crank pin (7) engages with the second contact portion (37) of the second positioning member (15) (Figs. 4 (b) and 5 (b)), whereby the crank shaft (1) Are positioned at the second roughing position. After that, start each drill (21) and set both webs (9) (11).
A second rough balance hole (40a) is formed in the. This hole (40
The depth of a) is set to such a depth that it can be erased in consideration of the previously measured vertical imbalance.

When the rough machining is completed in this way, the crankshaft (1) is removed from the machining device and conveyed to the balancing device. In this balancing device, the amount of unbalance in the horizontal and vertical directions is re-measured in the same procedure as the above-mentioned unbalance measurement.

After the imbalance measurement is completed, the crankshaft (1) is conveyed again to the processing device, and both ends are rotatably supported by the supporting device. Further, before and after this, the first positioning member (13) and the second positioning member (15) are integrally swung to arrange them at the finishing position (B).

Then, the first crank pin (5) is pressed downward by the first pressing member (17) to engage the pin (5) with the first contact portion (35) of the first positioning member (13). Then, the crankshaft (1) is positioned at the first finishing position (FIGS. 4 (c) and 5 (c)). After this, drill (2
1) is started, and the first finishing balance hole (39) is formed in both webs (9) and (11) adjacent to the first rough balance hole (39a).
b) is formed. The depth of the first finishing balance hole (39b) is set so that the horizontal unbalance amount measured in the subsequent unbalance measurement can be erased.

Next, the second crank member (19) presses the second crank pin (7) downward to engage the pin (7) with the second contact portion (37) of the second positioning member (15). And the crankshaft (1) is positioned at the second finishing position (FIGS. 4 (d) and 5 (d)). And drills (21)
To start a second finishing balance hole (40b) adjacent to the second rough balance hole (40a) on both webs (9) (11).

Each balance hole (39
As shown in FIG. 5 (d), a), (39b), (40a), and (40b) are all formed toward the journal center (O), that is, with the axis aligned with the journal center (O). .

As described above, according to the device of the present invention, the two positioning members (13) and (15) are integrally swung between the rough machining position A and the finishing machining position B. It is possible to perform roughing and finishing with the equipment of the table.

In FIGS. 4A to 4D, only the driving side pressing member is shown, and the non-driving side pressing member is omitted. However, in each step, the non-driving side pressing member is not shown. It is necessary to retract the pressing member upward so as not to obstruct the rotational movement of the crankshaft (1) or release the pressing force so as to follow the rotational movement of the crankshaft (1).

[0040]

As described above, according to the apparatus of the present invention, since roughing and finishing can be performed by one apparatus,
Compared with the conventional device, the unbalance correction can be performed in a smaller space, which is effective in saving space.
In addition, except when measuring the unbalance amount, it is not necessary to transfer the product between the devices, so the transfer mechanism between the roughing device and the finishing device can be omitted, and the cost and efficiency can be improved. You can Further, it is possible to correct the imbalance with high accuracy without shifting the reference position during processing.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a device of the present invention.

FIG. 2 is a side view of the device of the present invention.

FIG. 3 is a perspective view showing an upper structure of a positioning member.

FIG. 4 is a vertical sectional view showing a processing step by the device of the present invention.

FIG. 5 is an enlarged view of a main part of FIG.

FIG. 6 is a vertical cross-sectional view showing a formation state of balance holes.

FIG. 7 is a plan view of a conventional roughing device.

8 is a vertical cross-sectional view showing a processing procedure in a conventional roughing processing apparatus, FIG. 8A is a cross-sectional view taken along line D-D in FIG.
The figure (b) similarly shows a cross section taken along the line EE.

9 is a vertical cross-sectional view showing a processing procedure in a conventional finishing device, FIG. 9 (a) is a cross section taken along line DD in FIG. 7, and FIG. 9 (b) is a cross section taken along line E-E. Indicates.

[Explanation of symbols]

 1 Crank Shaft 3 Crank Journal 5 First Crank Pin 7 Second Crank Pin 9 First Web 11 Second Web 13 First Positioning Member 15 Second Positioning Member 17 First Pressing Member 19 Second Pressing Member 21 Drilling Means (Drill) A Roughing position B Finishing position O Journal center

Claims (1)

[Claims] 1. A crank journal, a first crank pin and a second crank pin symmetrically arranged at an eccentric position around the center of the journal, and a first crank pin and a second crank pin extending radially from the crank journal, respectively. A device for correcting an imbalance of a crankshaft having a first web and a second web that holds the crankshaft from both sides in the axial direction, the support device rotatably supporting the crankshaft, and a lower part of the first crankpin. A first positioning member that is disposed on a radial surface that intersects the crank pin and that swings between a rough machining position and a finishing machining position around the center of the journal; and below the second crank pin and the crank. Swing about the journal center, which is arranged on the radial surface intersecting with the pin and is integrated with the first positioning member. A first pressing member that is arranged to be capable of pressing the first positioning pin and the second positioning member that moves, and that holds the first crank pin in cooperation with the first positioning member at each of the roughing position and the finishing position. And a second crank pin that is arranged to be able to press the second crank pin and that holds the second crank pin in cooperation with the second positioning member at each of the rough machining position and the finishing machining position.
An unbalance correction device for a crankshaft, comprising: a pressing member; and punching means arranged on the free end sides of the first and second webs, respectively, respectively toward the center of the journal.