JPH1133819A - Dividing device for connecting rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rupturally divide the major end of a connecting rod smoothly and accurately and facilitate making the whole device in a small-sized and lightweight construction. SOLUTION: A connecting rod 12 is fixed to a clamp means 14, and a wedge 18 is inserted to expansion tools 16a and 16b arranged at the major end 12a of the rod, and a load is given to the wedge 18 previously by a first weight 20. The second weight 22 falls onto a sphere 30 under the action of a stopper means 28, and an impact load is applied to the wedge 18 through the first weight 20, and the major end part 12a is divided rupturally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting rod splitting device for breaking and splitting the large end of a connecting rod integrally formed with a large end and a small end into a rod body and a cap. About.

[0002]

2. Description of the Related Art For example, a connecting rod, which is an engine part for an automobile, has a small end connected to a piston side and a large end connected to a crank side. The large end is divided into a rod body and a cap to be coupled to the crankshaft, and is integrally fixed by bolts.

Therefore, various devices (and methods) have been proposed for dividing the connecting rod as described above. For example, Japanese Patent Application Laid-Open No. 5-200633 discloses this type of technology.

This prior art has a pressing member inserted into a coupling hole at a large end of a connecting rod, and a taper portion which engages with a taper surface formed inside the pressing member and slides vertically. A free slide shaft, a drive shaft for driving the slide shaft, and a hydraulic device for applying a driving force to the drive shaft are provided. When the drive shaft is moved in the horizontal direction under the action of the hydraulic device, the slide shaft having a tapered portion that engages with the tapered end of the drive shaft slides upward, and is taperedly engaged with the slice ride shaft. The pressing member performs the expanding operation in the horizontal direction in the coupling hole. As a result, the pressing member moves from the inside to the outside, and the large end is broken and divided from the notch formed at a predetermined position in advance.

[0005]

However, in the above-mentioned prior art, by moving the slide shaft up and down via a hydraulic device, the pressing member taperly engaged with the slide shaft is provided in the coupling hole at the large end. Is used to perform the expansion operation. Therefore, in order to surely divide the large end portion, the hydraulic device itself becomes considerably large, and it becomes difficult to obtain a stable breaking force due to fluctuations in hydraulic pressure and the like. In addition, a problem has been pointed out that the structure of the peripheral device is complicated because the driving force is transmitted from the hydraulic device to the pressing member via the drive shaft and the slide shaft.

At this time, as disclosed in the above-mentioned prior art, it is conceivable to provide a hammer device for applying an impact load from the outside of the large end toward the notch portion. There is a problem that it becomes large and complicated.

The present invention solves this kind of problem, and provides a connecting rod dividing device that can smoothly and reliably divide the large end portion and effectively simplify the configuration. The purpose is to:

[0008]

In order to solve the above-mentioned problems, in the connecting rod dividing device according to the present invention, wedges are provided between the expansion tools inserted into the coupling holes at the large ends. A predetermined load is applied to the wedge via the first weight. In this state, when the second weight is dropped from above the first weight, an impact load is applied to the wedge via the first weight, and the large end is fractured and split via the expansion tool.

Thus, by applying a predetermined load to the wedge via the first weight in advance, the weight of the second weight itself can be effectively reduced. Therefore, downsizing of the second weight moving means and the like is easily achieved, and downsizing of the entire apparatus is achieved.

[0010] In addition, a sphere for applying a point load to the center of the wedge is provided on one of the mating surfaces of the first weight and the second weight. Thereby, the occurrence of distortion at the time of division is suppressed, and the roundness of the coupling hole can be reliably maintained.

Further, in the present invention, a stopper is provided which can hold the second weight at a predetermined drop start position, and the stopper is configured to be capable of adjusting the position in the vertical direction. For this reason, the second weight can always be dropped from the predetermined height position, and the break division process of the large end can be stably performed.

At this time, by configuring the weight of the first weight so as to be freely adjustable, the stabilization of the breaking and splitting process at the large end can be performed more reliably. The workability is improved by providing the first weight moving means that can move the first weight vertically.

[0013]

1 is a partially cutaway perspective view of a connecting rod dividing device 10 according to an embodiment of the present invention, and FIG. 2 is a side view for explaining the inside of the dividing device 10. As shown in FIG. It is.

The dividing device 10 includes a connecting rod 1
2, a pair of extension tools 16a, 16b inserted into the coupling hole 12b of the large end 12a of the connecting rod 12, and a wedge 18 inserted between the extension tools 16a, 16b. A first weight 20 for applying a predetermined load to the wedge 18, a second weight 22 disposed above the first weight 20 and applying an impact load to the wedge 18 via the first weight 20; First weight moving means 2 that can move first weight 20 vertically by a predetermined distance (direction of arrow A)
4, a second weight moving means 26 capable of moving the second weight 22 in the vertical direction, a stopper means 28 capable of holding the second weight 22 at a predetermined drop start position, And a sphere 30 for applying a point load to the center of the wedge 18.

The clamping means 14 has a jig table 34 fixed on a substrate 32. As shown in FIGS. 3 to 5, the small end 12 of the connecting rod 12 is mounted on the jig table 34.
A supporting jig 36 that fits into the coupling hole 12d of FIG. 3c and supports the small end portion 12c is provided. Pressing jigs 38a and 38b for supporting the large end 12a of the connecting rod 12 from both sides are screwed to both sides of the jig base 34. At one end of the jig base 34, a scatter prevention plate 4 for preventing scatter of the cap 12e, which is broken and split from the large end 12a of the connecting rod 12 by the splitting process, is provided.
0 is fixed.

The extension tools 16a and 16b are mounted on the jig base 34 so as to be able to advance and retreat in the dividing direction (the direction of arrow B). The extension tools 16a, 16b are guided by the jig stand 34 and slide in the direction of arrow B in the form of plate-like slide portions 42a, 42b, and the connecting hole 12b of the large end 12a of the connecting rod 12.
, And integrally have pressing portions 44a and 44b each formed in a substantially semi-columnar shape.

On the flat surface side of the pressing portion 44a, a linear concave portion 46a extending in the axial direction for wedge insertion is formed.
A tapered recess 46b for wedge insertion is formed on the flat surface side of the pressing portion 44b.

A hollow frame member 48 is fixed on the substrate 32 so as to extend vertically upward, and a mounting plate 50 is fixed to an upper end of the frame member 48. As shown in FIG. 2, a first cylinder 52 constituting the first weight moving unit 24 is mounted on one side of the frame member 48. First
A horizontal plate 56 is attached to a rod 54 extending upward from the cylinder 52.
Is fixed, and a pair of first wires 58a,
One end of 58b is fixed.

The first wires 58a, 58b are connected to the mounting plate 50.
Pulleys 60a, 6 rotatably supported on the bottom side of the
Ob and 62a, 62b are inserted into the cover member 64. The cover member 64 is formed in a rectangular cylindrical shape having a rectangular cross section, extends in the vertical direction, and is fixed to the frame member 48. The other ends of the first wires 58a and 58b are fixed to the prism 66 within the cover member 64.

The prism body 66 is formed on the inner wall surface 6 of the cover member 64.
4a, while being guided in the direction of arrow A while sliding, the wedge 18 is screwed to the lower end of the prism 66. As shown in FIG. 3, the wedge 18 is a vertical surface 18 extending in the vertical direction.
a and a tapered surface 18b.
And the said taper surface 18b is inserted in each recessed part 46a, 46b of expansion tool 16a, 16b. Prism 6
A predetermined number of first weights 20 can be stacked and arranged on the upper portion of 6, and a sphere 30 is mounted on the uppermost first weight 20.

As shown in FIG. 2, a second cylinder 68 constituting the second weight moving means 26 is mounted on the frame member 48 on the side surface on the cover member 64 side. Second cylinder 6
A roller 72 is rotatably supported by a rod 70 extending vertically upward from the second wire 8.
Engage.

One end of the second wire 74 is disposed in the frame member 48 by engaging with a pulley 76a rotatably supported on the upper portion of the mounting plate 50.
Is fixed. A pair of locking rods 80 for regulating the upper end position of the pulling weight 78 are fixed to the frame member 48. The other end of the second wire 74 is connected to the cover member 6 via a pulley 76b rotatably supported on the bottom surface of the mounting plate 50.
The second weight 22 is attached to an end of the second weight 22.

The stopper means 28 is, as shown in FIG.
It includes a pair of cylinders 84 mounted on the predetermined mounting portion 82 among the plurality of mounting portions 82 provided on both sides of the cover member 64 at predetermined intervals in the direction of arrow A. The support rod 8 is inserted from each cylinder 84 into the cover member 64.
6 is freely projectable, and the second support rod 86
The bottom of the weight 22 is supported.

The operation of the dividing device 10 thus configured will be described below.

First, as shown in FIG. 4, a connecting rod 12 having a large end portion 12a and a small end portion 12c, which is integrally formed, for example, by casting, is disposed on the clamp means 14. Notches 12f, 12f are formed in the large end 12a of the connecting rod 12 at positions facing each other as fracture start ends of the inner peripheral surface of the connecting hole 12b.

The supporting jig 36 is inserted into the coupling hole 12d on the small end 12c side of the connecting rod 12, while a pair of extension tools 1 is inserted into the coupling hole 12b on the large end 12a side.
The pressing parts 44a, 44b constituting 6a, 16b are inserted. Here, the pressing portions 44a and 44b are arranged with their flat surfaces facing each other, and the respective flat surfaces are formed with the notch portions 12f and 1f formed on the connecting rod 12.
They are arranged on a line connecting 2f (see FIG. 4).

When the connecting rod 12 is mounted on the clamping means 14, as shown in FIG. 6A, the wedge 18 is integrally formed with the prism 66 via the first weight moving means 24.
Are arranged vertically upward, and do not interfere with the mounting work of the connecting rod 12.

Next, as shown in FIG. 7, when the first cylinder 52 constituting the first weight moving means 24 is driven and the rod 54 moves vertically upward (in the direction of arrow A1), the rod 54 A pair of first engaging members via 56
The wires 58a and 58b are sent vertically upward. Therefore, the prism 66 connected to the ends of the first wires 58a, 58b moves vertically downward (in the direction of arrow A2) in the cover member 64, and the wedge 18 attached to the prism 66 is moved. Are the pressing portions 44a, 4a of the expansion tools 16a, 16b.
4b are inserted into the concave portions 46a and 46b provided between them.
At this time, a load is applied to the wedge 18 by the first weight 20 disposed on the prism 66 (see FIGS. 6B and 7).

On the other hand, the second weight 22 is disposed at a predetermined drop start position via the stopper means 28. That is, the pair of cylinders 84 mounted on the predetermined mounting portion 82 are driven, and the second rods constituting the second weight moving unit 26 are driven in a state where the support rods 86 protrude into the cover member 64.
The cylinder 68 is driven.

Accordingly, as shown in FIG. 7, the rod 70 moves vertically upward, and the second wire 74 engaged with the roller 72 moves one end side vertically downward by the pulling weight 78. At the same time, the other end moves in the cover member 64 vertically downward integrally with the second weight 22. For this reason, the lower end of the second weight 22 is supported by a support rod 86 constituting the stopper means 28 and is held at a predetermined drop start position, while the second wire 74 has a pulling weight 78
, A predetermined tensile force is applied as a whole.

Then, the cylinder 84 constituting the stopper means 28 is driven, and the support rod 86 is moved to the cover member 64.
Leave from inside. For this reason, the second weight 22 held by the support rod 86 falls vertically downward and
The impact load of the second weight 22 is applied to the wedge 18 via the first weight 20 (see FIG. 6C). As a result, the wedge 18 is
a and the tapered surface 18b are pressed portions 44a, 44, respectively.
b are impacted into the recesses 46a, 46b, and the extension tools 16a, 16b move away from each other in the direction of arrow B.

When the expansion tools 16a and 16b are separated from each other, the inner peripheral surface of the coupling hole 12b of the large end 12a
An expanding force in the direction of arrow B is applied. Here, as shown in FIG. 4, notches 12 f, 12 f are formed in the connecting rod 12 in a direction orthogonal to the direction of arrow B, and the connecting rod 12 is provided with the notch 1.
It breaks from 2f and 12f and is divided into a cap 12e on the tip side and a rod body 12g.

At this time, since both sides of the large end 12a are held by the holding jigs 38a and 38b, when an impact load is applied to the large end 12a, for example, one notch 12f side It is possible to prevent a moment from acting on the other notch portion 12f side by breaking before the other notch portion 12f. Therefore, the coupling hole 12
b is effectively prevented from being distorted, and the cap 1
The effect that 2e can be easily and smoothly separated from the rod body 12g is obtained. In addition, when the cap 12e is separated, the expansion tool 16b can be moved to the shatterproof plate 40 side, so that the cap 12e separation operation can be performed more smoothly.

After the breaking and separating operation of the connecting rod 12 is completed, the second cylinder 68 is driven to
0 moves vertically downward. For this reason, first, the pulling weight 78 side is displaced vertically upward and abuts and is supported by the locking rod 80, and then the second weight 22 is pulled up vertically.

On the other hand, when the rod 54 constituting the first cylinder 52 is displaced vertically downward, the prism 66 is vertically integrated with the wedge 18 and the first weight 20 via the first wires 58a and 58b. In the predetermined direction, and is disposed at a predetermined retracted position. Then, after the rod body 12g and the cap 12e are taken out from the clamp means 14, a new connecting rod 12 is placed on the clamp means 14.

In this case, in this embodiment, the large end 12a
The expansion tools 16a and 16b are inserted into the coupling holes 12b of the first and second wedges 18. A wedge 18 is disposed between the expansion tools 16a and 16b, and a predetermined load is applied to the wedge 18 via a first weight 20 in advance. ing. In this state, the second weight 22 falls from a predetermined height position via the stopper means 28, and the wedge 18
, An impact load is applied through the first weight 20.

Therefore, even if the load of the second weight 22 is set to a small value, a desired impact load can be reliably applied to the wedge 18 via the first weight 20, and the second weight 22 is moved in the vertical direction. It is possible to effectively reduce the size of the second weight moving means 26 for moving forward and backward. Thereby, an effect is obtained that the entire division device 10 can be effectively reduced in weight and size.

Further, the second weight 22 is connected to the stopper 28
, Is always held at a predetermined drop start position. Therefore, the large end 12a of the connecting rod 12
, A stable load can be applied to the large end portion 12a, and the breaking division process of the large end portion 12a is stably performed. Further, the stopper means 28 can be arbitrarily disposed at a plurality of attachment portions 82 provided in the vertical direction, while the first weight 20
Can be freely arranged on the prism body 66 by a predetermined number. Thus, there is an advantage that the fracture splitting process of the large end portion 12a can be performed with high precision and smoothness even for the connecting rods 12 having various shapes and sizes.

Further, since the second weight 22 is guided by the inner wall surface 64a of the cover member 64 having a rectangular cross section and falls, the impact load is applied to the wedge 18 smoothly and stably. At this time, the first weight 20 has a sphere 30 for applying a point load to the center of the wedge 18 when the second weight 22 falls.
Is provided. Therefore, even if the falling position of the second weight 22 shifts, the load does not become uneven, and the large end 12
It is possible to reliably prevent the occurrence of distortion or the like at the divided portion a, and it is possible to maintain the roundness of the coupling hole 12b. The sphere 30 may be provided at the lower end of the second weight 22.

[0040]

As described above, in the connecting rod dividing apparatus according to the present invention, the wedge is inserted between the expansion tools for breaking and dividing the large end of the connecting rod, and the first weight is inserted into the wedge. When the second weight falls from above the first weight in a state where a predetermined load is applied in advance via the first weight, an impact load is applied to the wedge via the first weight. For this reason, the weight of the second weight can be effectively reduced, and the second weight moving means and the like for moving the second weight can be reduced in size, so that the weight and size of the entire dividing device can be easily reduced. Become executable.

Further, a sphere for applying a point load to the center of the wedge is provided on one of the mating surfaces of the first and second weights. Accordingly, even if the falling position of the second weight shifts, the occurrence of distortion and the like can be effectively prevented, and the roundness of the coupling hole at the large end can be reliably maintained. .

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a connecting rod dividing device according to an embodiment of the present invention.

FIG. 2 is an explanatory side view of the dividing device.

FIG. 3 is an exploded perspective view of a main part of the dividing device.

FIG. 4 is an explanatory plan view of a clamp unit constituting the dividing device.

FIG. 5 is a sectional view taken along line VV in FIG.

FIG. 6A is an explanatory side view when a connecting rod is arranged on a clamping means, FIG. 6B is an explanatory view showing a state in which a wedge is inserted into the connecting rod, and FIG. It is explanatory drawing of the state in which the weight fell and the impact load was given to the said connecting rod.

FIG. 7 is a side view illustrating the operation of the dividing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Dividing device 12 ... Connecting rod 12a ... Large end part 12b ... Coupling hole 12e ... Cap 14 ... Clamping means 16a, 16b ... Extension tool 18 ... Wedge 20, 22 ... Weight 24, 26 ... Weight moving means 28 ... Stopper means 30 ... sphere 34 ... jig stand 52, 68, 84 ...
Cylinder 64: Cover member 78: Weight

Claims (4)

[Claims] 1. A connecting rod splitting device for breaking and splitting the large end of a connecting rod integrally formed with a large end and a small end into a rod body and a cap, wherein: Clamping means for positioning and fixing a rod; a plurality of expansion tools inserted into the coupling hole at the large end; a first weight for applying a predetermined load to a wedge inserted between the expansion tools in advance; A second weight disposed above the first weight and applying an impact load to the wedge via the first weight; a first weight moving means capable of vertically moving the first weight; A second weight moving means capable of vertically moving the two weights, provided on one of the mating surfaces of the first weight and the second weight, when the second weight falls on the first weight; A sphere for applying a point load to the center of the wedge. Dividing apparatus of a connecting rod according to claim. 2. A connecting rod dividing apparatus according to claim 1, further comprising stopper means capable of holding said second weight at a predetermined drop starting position. 3. The connecting rod splitting device according to claim 2, wherein said stopper means is configured to be vertically adjustable in position. 4. The dividing device according to claim 1, wherein the weight of said first weight is adjustable.