JP2000071128A - Connecting rod rupturing and splitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting rod rupturing and splitting device capable of effectively sustaining relief force generated at the time of rupturing and splitting regardless of dimensional tolerance of the connecting rod not at rights to the center line and the line passing a rupturing and splitting prearranged surface and having a certain and safe connecting rod securing means. SOLUTION: A device for rupturing and splitting a connecting rod 9 integrally formed with a bearing cap 12 and the body side, to which a bearing cap 12 is to be connected, into the body and the bearing cap 12 by pressing a wedge 8 into a bearing on the larger end side of the connecting rod 9 through a split mold is provided with a securing means (such as a clamp plate 49) for pressingly securing the connecting rod 9 along the shaft center direction of the larger end side bearing. Thus the connecting rod 9 not only can be certainly secured, especially the larger end part, even if the dimensional tolerance is enormous because of the rough surface of the connecting rod being made by forging, but also effectively sustain relief force at the time of rupturing and splitting as well as having the rupturing and splitting into the connecting rod body 9 and the bearing cap 12 carried out with accuracy and certainty and it is safe even if a smaller end reference pin inclines to come off of the split mold by any chance by upward force applied to the connecting rod at the time of rupturing and splitting because the pin will be held down by the clamp plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a splitting device for a connecting rod used in an internal combustion engine or the like, and more particularly to a fixing means for the connecting rod.

[0002]

2. Description of the Related Art In the fracture division, a connecting rod body and a bearing cap portion are integrally formed by, for example, a sintering forging method, and a notch is formed on an inner surface of the large end side bearing portion to be divided. The wedge is press-fitted into the bearing portion via a split mold, whereby the main body and the bearing cap portion are split at the notch.

As means for fixing the connecting rod at the time of the fracture splitting, a means disclosed in Japanese Patent Application Laid-Open No. Hei 5-277843 and shown in FIG. 6 is generally used. That is, if the connecting rod as shown in FIG. 6, that is, the connecting rod 1 in which the center line aa of the connecting rod and the line bb passing through the plane to be fractured are perpendicular to each other, the main body 2 and the bearing cap portion 3 after the division.
The left and right ends 5a, 6a of the fixed-side pressing portion 5 and the movable-side pressing portion 6 of the breaking and splitting device 4 are attached to the large end-side seats 2a, 3a used when fastening with the bolts and nuts (not shown). And the movable side pressing portion 6 is actuated and fixed.
Reference numeral 7 denotes a split type that fits into the bearing portion 1a of the connecting rod 1, and reference numeral 8 denotes a wedge that is press-fitted into the split type 7.

However, if the connecting rod 9 as shown in FIG. 7, that is, the center line a'-a 'of the connecting rod 9 does not form a right angle with the line bb passing through the plane to be cut and split, FIG.
Such a fixing means cannot be adopted. In this case, FIG.
As shown in FIG. 9, the small end 10 of the connecting rod 9 is
1 and a bearing cap portion mounted on a bearing cap portion side movable plate 24 provided on the support base 21 so as to face the main body side fixing plate 23 of the large end portion 11. The front end 6a of the movable pressing portion 6 is pressed against the left and right seats 12a of the base 12 and fixed.

At this time, the bearing cap portion 12 at the large end 11 of the connecting rod 9 is placed on the main body side fixing plate 23.
When the relief force receiving pin 25 is set up so as to come into contact with the shoulder 11a which is coupled with the wedge 8, the wedge 8 is pressed into the split mold 7 fitted into the large end side bearing portion 11b, and the bearing cap portion 12 is fractured and divided. The generated escape force in the direction of the shoulder 11a is received.

However, when the connecting rod 9 is manufactured by a forging method, the shoulder 11a has a large dimensional tolerance due to the rough material surface, and a gap may be generated between the shoulder 11a and the relief force receiving pin 25. Since the escape force cannot be received, there is a possibility that the fracture is not accurately divided at the fracture division plane. Further, as described above, the connecting rod 9 is connected to the small end reference pin 22, the escape force receiving pin 25, and the distal end 6 of the movable pressing portion 6.
In the case of fixing with a, depending on how the force is applied at the time of breaking and splitting, there is a possibility that the broken and split main body side may come off from the pins 22 and 25 upward.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in a conventional connecting rod breaking and splitting device, particularly in a device in which the center line of the connecting rod does not form a right angle with a line passing through a plane to be split. Regardless of the dimensional tolerance of the connecting rod, the relief force or the like generated when the wedge is press-fitted into the split die fitted into the large-end-side bearing portion as described above and divided by fracture is effectively received. SUMMARY OF THE INVENTION It is an object of the present invention to provide a connecting rod fracture splitting device having a reliable and safe connecting rod fixing means.

[0008]

According to a first aspect of the present invention, there is provided a connecting rod rupture splitting device according to the present invention, in which a bearing cap portion constituting a large end portion and a main body connected to the cap portion are integrally formed. In a device for press-fitting a wedge into a large end side bearing portion of a connecting rod through a split mold and breaking and dividing the main body and the bearing cap portion, the connecting rod is
A fixing means is provided for pressing and fixing the large end side bearing portion along the axial direction.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to FIGS. 1 to 5, 3
Numeral 0 denotes a connecting rod breaking and splitting device provided with a fixing means according to the present invention, and a pair of guide rails 33 is supported on a support base 31 by bolts 34 via a holding plate 32 in a longitudinal direction on the support base 31.
1 and the connecting rod body side fixed plate 35 and the bearing cap side movable plate 3 by the pair of guide rails 33.
6 are disposed so as to sandwich them and face each other. A semi-circular left and right portion 37a, 37b
The fixing plate 35 formed in a semicircular shape so as to match the trunk of
And a flange 37c formed at the lower end thereof is free, but the flange 37d is fixed to the movable plate 36 by small bolts 38 or knock pins. A wedge hole 39 into which the wedge 8 is press-fitted is formed in the split die 37. The wedge hole 39 is vertical in the left portion 37a in FIGS. 1 and 2, but is formed in the right portion 37b. It is inclined according to the shape. The flange portions 37c and 37d of the split mold 37 are movably fitted into an oval recess 31a formed on the upper surface of the support base 31.

Reference numeral 40 denotes a small-end reference pin set at a predetermined position on the support base 31 for fitting the small end 10 of the connecting rod 9, and an adjusting ring 41 for keeping the connecting rod 9 horizontal is provided therearound. I have. 42 is a bearing cap part side pressing mechanism for pressing the bearing cap part 12 of the connecting rod 9,
The length adjusting bolt 46 is screwed to both ends of a support plate 45 attached to the tip of a rod 44 of the fluid working cylinder 43, for example.
7 and press fittings 48 that are in contact with the left and right seats 12a of the bearing cap 12 are attached to the tips of the bolts 46.

Reference numeral 49 denotes a clamp plate having a width slightly smaller than the width of the large end portion 11 of the connecting rod 9. In the drawing, the side in contact with the large end portion 11 of the connecting rod 9 has a bearing portion 11b.
In addition to the above, a semicircular concave portion 49a is formed, and an elongated hole 49b is formed on the opposite side thereof, so that the concave portion 49a can be fitted to the clamp support pin 50 erected at a predetermined position of the support base 31. The clamp plate 49 is configured to be pressed and fixed from above in FIG. 2 by, for example, a fluid working cylinder (not shown) when the connecting rod is broken and divided.

In the illustrated embodiment, the following pressing mechanism is further provided to ensure that the breaking division is performed at the notch position. That is, the pair of holding plates 32
, The left and right portions 37a, 37b of the split mold 37
The recess 32
a, and a rod 52 connecting the cap 51 to the recess 32a so as to be slidable with a chevron-shaped pressing cap 51 having a protruding end facing the opposing portion, and rotatably connecting the cap 51 to the rear thereof. The pressing plate 53 is screwed to the holding plate 32 so as to be able to advance and retreat.

Next, the operation of the connecting rod fracture splitting device of the present invention constructed as described above will be described mainly with reference to FIGS. First, the support base 31 of the connecting rod breaking and splitting device of the present invention is fixed by means not shown, and the support plate 45 is lowered to the right in FIG. 3 by the operating cylinder 43 of the bearing cap side pressing mechanism 42. Furthermore,
By rotating the pressure bolt 53 of the pressure mechanism in the direction to loosen,
The pair of pressure caps 51 is lowered.

In this state, as shown in FIG. 4, the small end 10 of the connecting rod 9 is fitted on the small end reference pin 40, and the large end bearing 11b is fitted on the split die 37, and is seated. A notch (not shown) is formed in advance on the inner surface of the bearing portion 11b of the connecting rod 9 at a plane to be divided at a break which coincides with the opposing portions of the left and right portions 37a and 37b of the split mold 37.

Here, the support plate 45 is advanced to the left in FIG. 4 by the operating cylinder 43 of the bearing cap side pressing mechanism 42, and the pressing fitting 48 of the mechanism 42 is
To the left and right seats 12a. Also, by turning the pressing bolt 53 of the pressing mechanism, the pressing cap 51 is advanced through the rod 52 in the recess 32 a, and the tip of the cap 51 is moved to the large end 1 corresponding to the notch in the connecting rod 9.
1 Apply a predetermined force against the outside.

Next, the elongated hole 49b of the clamp plate 49 is fitted into the clamp support pin 50, and the concave portion 47a on the opposite side is adjusted by the elongated hole 47b to form the left portion 37a of the split mold 37.
Abut. In this state, the clamp plate 49 is pressed and fixed from above by a working cylinder or the like (not shown).

When the wedge 8 is pressed into the wedge hole 39 of the split mold 37 by a pressing means (not shown) as shown in FIG. Along with the right portion 37b of the split mold 37 and the bearing cap-side movable plate 36, the support plate 45 of the bearing cap-side pressing mechanism 42 and the like are moved away from the side to the right. At this time, among the forces received on the main body side of the connecting rod 9, the force along the center line is mainly generated by the small-end reference pin 40, and it is assumed that the escape force and the force for removing the connecting rod 9 upward are generated. This is also received by each of the clamp plates 49, so that the splitting of the bearing cap portion 12 is accurately and reliably performed.

[0018]

In the connecting rod fracture splitting device according to the present invention, a large-end-side bearing portion of a connecting rod integrally formed with a bearing cap portion constituting a large-end portion and a main body connected to the cap portion. Press the wedge through the split mold
In the device for splitting the main body and the bearing cap, the fixing means for pressing and fixing the connecting rod along the axial direction of the large end side bearing part is provided, so that the connecting rod is a forged product having a rough material surface. Therefore, even if the dimensional tolerance is large, the connecting rod, especially the large end thereof, can be securely fixed, and the relief force at the time of splitting can be effectively received. There is an effect that the breaking division of the portion can be performed accurately and reliably.

Further, even if the connecting rod is to be disengaged from the small end reference pin and the split mold due to an upward force applied at the time of the breaking division, the connecting rod is safely held from above by the clamp plate.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a connecting rod fracture splitting device according to the present invention.

FIG. 2 is a front view of an embodiment of a splitting device for a connecting rod according to the present invention.

FIG. 3 is an operation explanatory view of one embodiment of the splitting device for a connecting rod of the present invention, and is a perspective view showing a ready state.

FIG. 4 is an operation explanatory view of an embodiment of the connecting rod breaking and splitting device of the present invention, and is a perspective view showing a mounted state of the connecting rod.

FIG. 5 is an operation explanatory view of one embodiment of the splitting device for a connecting rod of the present invention, and is a perspective view showing a mounted state of a clamp plate.

FIG. 6 is a plan view of a conventional connecting rod fracture splitting device.

FIG. 7 is a plan view showing an example of a connecting rod in which a center line and a fracture split surface are not orthogonal.

FIG. 8 is a plan view of a main part of a conventional connecting rod break splitting device used for splitting the connecting rod shown in FIG. 7;

FIG. 9 is a cross-sectional view of a main part of the conventional connecting rod fracture splitting device shown in FIG. 8;

[Explanation of symbols]

1, 9 Connecting rod 2 Main body 3, 12 Bearing cap part 4, 30 Break splitting device 5 Fixed side pressing part 6
Movable side pressing part 7, 37 Split type 8 Wedge 10 Small end 1
DESCRIPTION OF SYMBOLS 1 Large end part 21, 31 Support base 22, 40 Small end reference pin 23, 35 Connecting rod main body side fixing plate 24, 36
Bearing cap part side movable plate 25 Relief force receiving pin 32 Holding plate 33 Guide rail 34 Bolt 38 Small bolt 39 Wedge hole
41 Adjustment ring 42 Bearing cap part side pressing mechanism 43 Fluid working cylinder 44, 52 Rod 45 Support plate 46 Adjustment bolt 47 Adjustment nut 48 Press fitting 49 Clamp plate 50 Support pin 51 Pressure cap 53 Pressure bolt.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Katsuaki Aihara, Inhouse 8 Fujisawa-shi, Kanagawa Prefecture Isuzu Motors Fujisawa Plant Co., Ltd. F term (for reference) 3J033 AA04 AC01 EA02

Claims (3)

[Claims] 1. A wedge is press-fitted into a large end side bearing portion of a connecting rod integrally formed with a bearing cap portion constituting a large end portion and a main body side connected to the cap portion via a split mold, In the apparatus for splitting the main body and the bearing cap portion, a fixing means for pressing and fixing the connecting rod along the axial direction of the large end side bearing portion is provided. 2. The connecting rod breaking and splitting device according to claim 1, wherein said fixing means presses and fixes mainly a large end of the connecting rod. 3. The connecting rod according to claim 1, wherein a center line of the connecting rod is not orthogonal to a fracture dividing plane.
Or the connecting rod fracture splitting device according to claim 2.