JP3190208B2 - Imbalance correction device for crankshaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unbalance correcting apparatus for performing drilling on a web of a crankshaft when correcting an unbalance of the crankshaft.

[0002]

2. Description of the Related Art After manufacturing a crankshaft, which is a component of an engine, it is necessary to correct the imbalance in order to suppress the occurrence of vibration when the engine is driven. As shown in FIG. 6, this imbalance 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 journal center (O). Normally, each balance hole (55a) (55
b) (56a) and (56b) are formed in two stages of roughing and finishing (the roughing holes (55a) and (56a) are indicated by solid lines, and the finishing holes (55b) and (56b) Is indicated by a broken line).

Hereinafter, a conventional procedure for correcting imbalance will be described.

The unbalance amount of the crankshaft (51) is measured by a balancing device (not shown),
Is transported to the roughing device (57) shown in FIG. In this roughing device (57), two types (for horizontal and vertical balance) of rough balance holes (55a) (56) are formed in each web (52) (53).
Form a). Specifically, first, as shown in FIG. 8A, the first crank pin (59) is pressed by a pressing member (not shown).
Is pressed downward, and this pin (59) is inserted into the first plate (60).
To position the crankshaft (51) 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 started, and a first rough balance hole (55a) is formed at a free end of each web (52) (53). (For horizontal balance). Next, as shown in FIG.
Press down to rotate the crankshaft (51),
The second crankpin (63) is supported by the second plate (64) to position the crankshaft (51) at the second roughing position. After this, the drill (62) is activated and each web (5
2) A second rough balance hole (56a) (for vertical balance) is formed in (53).

[0005] Crankshaft (51) after roughing
Are transported to a balancing device, re-measured for the amount of unbalance, and then transported to a finishing device (not shown). The finishing device comprises a first and a second plate (60 ').
Except for (64 '), the main part is a roughing machine (57:
). Both plates (60 ') and (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) and (56a), the height of the contact portion that comes into contact with the crankpins (59) and (63) is adjusted by adjusting the height of the rough machining plates (60) and (64). It is arranged differently.

In this finishing machine, two types of finishing balance holes (55b) (55b) are formed in each web (52) (53) in the same procedure as in the rough machining machine. That is, FIG.
As shown in (1), the first crank pin (59) is supported by the first plate (60 ') to position the crankshaft (1) in the first finishing position, and the first finishing is performed by the drill (62'). A balance hole (55b) is formed. Next, the second crank pin (63) is pressed to rotate the crankshaft (51), the second finishing position is determined by the second plate (64 '), and the second finishing is performed by the drill (62'). Balance hole (56
b) is formed (FIG. 9B).

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

[0008]

As described above, conventionally,
Since two processing devices for roughing and finishing are arranged side by side, there is much waste in space, and there are many wastes in time and cost due to the necessity of many transport steps.
Furthermore, there is a possibility that the reference position at the time of processing may shift between rough processing and finish processing, and it has been difficult to obtain sufficient processing accuracy.

Accordingly, the present invention provides a space, time,
It is an object of the present invention to provide a processing apparatus which can solve the cost problem and correct the imbalance accurately.

[0010]

In order to achieve the above object,
The device of the present invention includes a crank journal, a first crankpin and a second crankpin symmetrically arranged at eccentric positions around the center of the journal, and a first crankpin and a second crankpin extending radially from the crank journal. An apparatus for correcting imbalance of a crankshaft having a first web and a second web that sandwiches a shaft from both sides in the axial direction,

A support device rotatably supporting the crankshaft, and a support device disposed below the first crankpin and on a radial surface intersecting the crankpin, and having a journal center between the roughing position and the finishing position. Rocks as the center,
A first positioning member having a first contact portion that engages with the first crank pin at each of the roughing position and the finishing position;
It is arranged below the second crankpin and on a radial surface intersecting with the crankpin, swings around the center of the journal integrally with the first positioning member, and moves at the roughing position and the finishing position at each of the roughing position and the finishing position. (2) a second positioning member having a second contact portion that engages with the crankpin; and a second positioning member disposed so as to be able to press the first crankpin, wherein the first crankpin contacts the first contact portion at each of the roughing position and the finishing position. A first pressing member to be engaged and a second crankpin are disposed so as to be able to press, and the second pressing is performed at each of the roughing position and the finishing position.
A second pressing member that presses the crankpin and rotates the crankshaft to engage the second crankpin with the second contact portion; and a free end side of the first and second webs, each of which is disposed toward the center of the journal. Perforation means.

[0012]

First, the crank shaft is rotatably supported by the support device, and the first positioning member and the second positioning member are arranged at the rough machining position. Next, the first crank pin is pressed by the first pressing member, and the crank pin is brought into contact with the first positioning member. When the first crank pin is held between the first positioning member and the first pressing member, the crankshaft is pressed. Are positioned at the first roughing position. In this state,
Activating the piercing means to form a first rough balance hole at the free ends of the first web and the second web.

Then, the second crankpin is pressed by the second pressing member, and the crankshaft is rotated to bring the second crankpin into contact with the second positioning member. Thereby, the crankshaft is positioned at the second rough machining position. ). Next, the perforating 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 swung integrally to the finishing position. Then, as in the case of roughing,
The first pressing member presses the first crank pin, and this is
The crankshaft is positioned by contacting the positioning member (first finishing position), and the perforating means is activated to form first finishing balance holes at the free ends of both webs.

Next, after the second crankpin is pressed by the second pressing member to rotate the crankshaft, and the second crankpin is brought into contact with the second positioning member to position the crankshaft (second position). (Finish processing position), and a second finishing balance hole is formed by the perforating means.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention is applied to a four-cylinder crankshaft, and an embodiment in that case will be described with reference to FIGS.

As shown in FIGS. 1 and 2, the crankshaft (1) is eccentrically arranged with respect to the crank journal (3) at a symmetrical position about the journal center (O) in the axial direction. A pin (5) and a second crankpin (7) (two each) and a web (9) extending radially and connecting the crankpin (5) (7) and the crank journal (3); 11).

The first crankpin (5) is coaxially arranged at the center of the crankshaft (1), while the second crankpin (7) sandwiches the first crankpin (5) from both sides in the axial direction. They are coaxial.

In the following description, the web (9) for holding the first crankpin (5) from both sides in the axial direction will be referred to as "first crankpin".
The web (11) holding the second crank pin (7) from both axial sides is referred to as a "second web".

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

The positioning members (13) and (15) have a plate shape arranged on a radial surface, and are arranged below the adjacent first and second crank pins (5) and (7), respectively. I have.

The lower ends of both positioning members (13) and (15)
It is connected to the swing arm (27) via the connecting members (25) and (25). At both ends of the swing arm (27), support arms (2
9) and (29) are pivotally mounted, and 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) (33) is arranged with its axis centered on the center of the journal (O), so that both positioning members (13) (1)
5), as shown in FIG. 1, a solid line position A (rough machining position) and a two-dot chain line position B around the journal center (O).
(Finish processing position).

As shown in FIG. 3, the upper end of the positioning member (13) (hereinafter referred to as the first positioning member) disposed below the first crank pin (5) is formed by obliquely cutting a corner of a rectangular plate. A first contact portion (35), which is cut out in a substantially semicircular shape, is formed on the upper end surface thereof. When the first positioning member (13) reaches the roughing position (A) and the finishing position (B), the first contact portion (35) can be engaged with the first crankpin (5). Is formed.

A positioning member (15) disposed below the second crankpin (7) (hereinafter, referred to as a second positioning member)
Has a shape in which the first positioning member (13) is turned upside down, and, like the first positioning member (13), a corner at the upper end thereof is cut off obliquely. Further, a semicircular second contact portion (37) is formed on the upper end surface thereof, and the second contact portion (37) is, like the first contact portion (35), a second positioning member. (15) is the roughing position (A) and the finishing position (B)
Are formed at positions where they can be engaged with the second crankpin (7), respectively.

As shown in FIGS. 1 and 2, the pressing member (1
7) and (19) are configured to be swingable about a pair of rotation axes P spaced apart in parallel with the journal center (O). The two pressing members (17) and (19) are driven by an air cylinder (not shown), and can swing independently in a radial plane. One of the pressing members (17) (first pressing member) presses the first crank pin (5) downward and presses the pin (5) to the first contact portion (1) of the first positioning member (13). Three
5), and the other pressing member (19) (the second pressing member) presses the second crank pin (7) downward to move the pin (7) to the second positioning member (15). 2 contact parts (3
Engage with 7).

First and second crankpins (5) (7)
Is pressed in contact with the pressing plates (37) and (37) of both pressing members (17) and (19). At this time, the pressing plates are pressed so that the crank pins (5) and (7) are not damaged. (37) (37)
Is made of a material softer than the crankpins (5) and (7), for example, gunmetal.

The drill (21) is connected to the free end of each web (9) (11) (each web (9) (11) is connected to the crank pin (5)).
(Refers to the portion located on the outer diameter side when rotated about (7)).
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), and is independently and rotationally driven by a rotary drive source (not shown), and is independently and horizontally driven by a slide drive source (not shown). In addition, the arrangement position of the drill (21) is the same as the conventional position (see FIG. 7).

Hereinafter, a processing procedure by the apparatus of the present invention will be described with reference to FIGS.

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

After measuring the unbalance, the crankshaft (1) is transported to the processing device. The transported crankshaft (1) is rotatably supported at both ends by a support device (bearing or the like) not shown.

In a 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)). Thereby, the crankshaft (1) is positioned at the first roughing position. After the positioning is completed, each drill (21) is started to form a first rough balance hole (39a) at the free end of the first web (9) and the second web (11). At this time, the depth of the hole (39a) is set to such a depth that the hole (39a) can be erased in consideration of the previously measured horizontal imbalance amount.

Next, the second pressing member (19) is moved downward to press the second crankpin (7) and rotate the crankshaft (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)). Is positioned at the second rough machining position. After this, each drill (21) is activated and both webs (9) (11)
Then, a second rough balance hole (40a) is formed. This hole (40
The depth of a) is set to a depth that can be erased in consideration of the previously measured imbalance in the vertical direction.

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

After completion of the unbalance measurement, the crankshaft (1) is transported to the processing device again, and both ends are rotatably supported by the support device. In addition, before and after this, the first positioning member (13) and the second positioning member (15) are swung integrally, and these are arranged at the finishing position (B).

Next, the first crank pin (5) is pressed downward by the first pressing member (17), and the pin (5) is engaged with the first contact portion (35) of the first positioning member (13). Then, the crankshaft (1) is positioned at the first finishing position (FIGS. 4C and 5C). After this, drill (2
1) is activated, and the first finishing balance holes (39) are provided in both webs (9) and (11) adjacent to the first rough balance holes (39a).
b) is formed. The depth of the first finish balance hole (39b) is set to a depth capable of eliminating the horizontal unbalance amount measured in the subsequent unbalance measurement.

Next, the second crank pin (7) is pressed downward by the second pressing member (19), and the pin (7) is engaged with the second contact portion (37) of the second positioning member (15). Then, the crankshaft (1) is positioned at the second finishing position (FIGS. 4D and 5D). And the drill (21)
To form a second finish balance hole (40b) in both webs (9) and (11) adjacent to the second rough balance hole (40a).

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

As described above, according to the apparatus of the present invention, the two positioning members (13) and (15) are swung integrally between the rough processing position A and the finishing processing position B. Roughing and finishing can be performed by a single device.

In FIGS. 4A to 4D, only the pressing member on the driving side is shown, and the pressing member on the non-driving side is not shown. It is necessary to retract the pressing member upward so as not to hinder the rotational movement of the crankshaft (1), or to 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, roughing and finishing can be performed by one apparatus.
Unbalance correction can be performed in a smaller space as compared with the conventional device, which is effective in saving space.
Also, there is no need to transport the product between the devices except when measuring the amount of unbalance, so the transport mechanism between the roughing device and the finishing device can be omitted, and cost reduction and efficiency improvement can be achieved. Can be. Further, it is possible to correct the imbalance with high precision without shifting the reference position at the time of processing.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of the 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 longitudinal sectional view showing a processing step by the apparatus of the present invention.

FIG. 5 is an enlarged view of a main part of FIG. 4;

FIG. 6 is a longitudinal sectional view showing a state of forming a balance hole.

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

8A and 8B are vertical sectional views showing a processing procedure in a conventional roughing apparatus, and FIG. 8A is a cross-sectional view taken along line DD in FIG.
The figure (b) also shows a cross section along the line EE.

9A and 9B are vertical cross-sectional views showing a processing procedure in a conventional finishing apparatus, in which FIG. 9A is a cross section taken along line DD in FIG. 7, and FIG. 9B is a cross section taken along line EE in FIG. Is shown.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crankshaft 3 Crank journal 5 1st crankpin 7 2nd crankpin 9 1st web 11 2nd web 13 1st positioning member 15 2nd positioning member 17 1st pressing member 19 2nd pressing member 21 Drilling means (drill) A Roughing position B Finishing position O Center of journal

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B23Q 17/00 B23B 47/28 F16C 3/20 B23Q 3/18

Claims (1)

(57) [Claims] 1. A crank journal, a first crankpin and a second crankpin symmetrically arranged at eccentric positions around the center of the journal, and a first crankpin and a second crankpin extending radially from the crank journal, respectively. A device for correcting imbalance of a crankshaft having a first web and a second web sandwiched from both sides in an axial direction, comprising: a support device for rotatably supporting a crankshaft; And is arranged on a radial surface intersecting the crank pin and swings about a journal center between a rough machining position and a finishing machining position, and
And the first crank pin at each of the finishing positions
A first positioning member having a first contact portion that, disposed on the radially faces to and intersects with the crank pin below the second crank pin, around the journal center becomes first positioning member integrally swings Te, and rough machining position
Engage with the second crankpin at each of the finishing positions
A second positioning member provided with a second contact portion, and a first crank pin disposed so as to be able to press the first crank pin, and the first crank pin is brought into the first contact position at each of the roughing position and the finishing position.
The first pressing member to be engaged with the contact portion and the second crankpin are disposed so as to be pressable, and press the second crankpin at each of the roughing position and the finishing position.
And rotate the crankshaft to rotate the second crankpin.
An unbalance of a crankshaft, comprising: a second pressing member to be engaged with a second contact portion; and piercing means arranged at respective free ends of the first and second webs toward the center of the journal. Correction device.