JP2006043821A - Dividing device for connecting rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dividing device for a connecting rod, small-sized, reducing the cost, and easily altering a dividing condition. <P>SOLUTION: This connecting rod dividing device includes: a dividing tool (a first slider 51 and a second slider 52) having first and second pressing members 59, 61 fitted to the large end part 3 of the connecting rod. A wedge 44 is pressed in between the first pressing member 59 and the second pressing member 61. The device includes a pressurizing device 8 for pressurizing the wedge 44 downward by free drop of a plumb 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a connecting rod splitting device that splits a connecting rod large end portion of an engine connecting rod by breaking.

  Conventionally, connecting rods that require high strength, such as connecting rods for automobile engines, have been formed by forging. In this type of connecting rod, when the connecting rod base material having a connecting rod large end and a connecting rod small end is formed by forging, and the crank pin hole is formed in the connecting rod large end, the connecting rod large end is the connecting rod main body. And the cap. The cap is fastened to the connecting rod body with two cap fixing bolts with a crank pin sandwiched between the cap and the connecting rod body.

When the connecting rod large end is divided as described above, it is performed by breaking in order to improve the positioning accuracy of the cap when the cap is assembled to the connecting rod body after the dividing and to improve the roundness of the crankpin hole. (See, for example, Patent Document 1).
This breaking is performed by fitting a pair of split jigs that can move between the small end of the connecting rod and the opposite side into the large end of the connecting rod, and driving a wedge between the split jigs. Yes.
In the conventional connecting rod splitting device disclosed in this publication, a hydraulic cylinder is used as a drive source for driving the wedge between splitting jigs.
In addition, the applicant could not find prior art documents closely related to the present invention by the time of filing other than the prior art documents specified by the prior art document information described in this specification. .
JP 2002-66998 A (FIG. 1)

Since the conventional connecting rod dividing apparatus configured as described above has a configuration in which the wedge is driven by the hydraulic cylinder, the hydraulic equipment such as the hydraulic pump and the hydraulic oil tank becomes large, and the structure becomes complicated. There was a problem that a large space was required for installation.
In addition, in order to perform division (fracture) at a high speed in order to obtain a better fracture surface, the above-described hydraulically driven dividing device requires an ultra-high pressure type hydraulic cylinder. Along with this, the strength of the hydraulic system must be improved. For this reason, in order to realize this with the conventional dividing apparatus, not only the manufacturing cost of the dividing apparatus is increased, but also the maintenance cost is high for the maintenance of the equipment that handles high-pressure hydraulic pressure, so the running cost is also high. There was a problem of becoming.

  Furthermore, the above-described conventional connecting rod splitting apparatus has a problem that the time required for so-called setup change when changing the splitting condition is changed, for example, when the type of connecting rod to be split is changed. This is because this type of connecting rod splitting device needs to adjust the hydraulic pressure etc. so that the fracture surface is the best for each connecting rod of different size and type, and this adjustment work is complicated. The speed required for the division is not simply determined by the hydraulic pressure applied to the hydraulic cylinder, but is complicated by the influence of other factors such as the mass of the moving part of the hydraulic cylinder, the flow path resistance, the capacity of the hydraulic oil tank, etc. Change. For this reason, in the conventional dividing apparatus, trial and error must be repeated until a desired dividing speed is obtained, and as described above, the time required for the setup change is long. The above-described problems are the same even in the connecting rod splitting device configured to drive the wedge by the pneumatic cylinder.

  The present invention has been made to solve such a problem, and has an object to provide a connecting rod splitting device that can be reduced in size and cost, and that can easily change splitting conditions. And

  In order to achieve this object, the connecting rod splitting device according to the present invention is a connecting rod that splits the connecting rod large end portion by press-fitting a wedge between a pair of split jigs fitted to the connecting rod large end portion. In the fracture splitting apparatus, a pressurizing device that pressurizes the wedge downwards by free fall of a weight is provided.

  The connecting rod splitting device according to a second aspect of the present invention is the connecting rod splitting device according to the first aspect of the present invention, wherein the guide rod for restricting the moving direction of the weight in the vertical direction and the weight is raised. A driving device for holding the weight in a raised position and releasing the holding state when the connecting rod is divided, a pressure receiving member having a wedge at the lower end and a pressure receiving surface against which the weight hits the upper end It is equipped with.

According to the present invention, the connecting rod large end can be divided by the impact load generated by the falling of the weight.
For this reason, the connecting rod splitting device according to the present invention eliminates the need for a power source for pressurizing the wedge when splitting, so the structure is simplified compared to the conventional connecting rod splitting device configured to drive the wedge by the cylinder. As a result, the size can be reduced and the cost can be reduced.

In addition, since this connecting rod splitting device splits the connecting rod large end by impact load, it can increase the speed required for splitting compared to, for example, pressurizing the wedge with hydraulic pressure, and a good fracture surface. Can be easily obtained.
Furthermore, since the impact load can be easily adjusted by changing the weight of the weight and the drop height, the setup change when dividing different types of connecting rods can be performed in a short time, and the production efficiency can be improved. Can be improved.

  In the connecting rod splitting device according to the second aspect of the present invention, the wedge is lifted by the driving device and held by the holding device, whereby the wedge can be held at a predetermined drop start position. Loading and unloading work can be performed. Further, the connecting rod splitting device is configured such that the weight is dropped along the guide rod by causing the holding device to release the holding state in a state where the wedge is positioned at the drop start position and the connecting rod is loaded, so that the pressure receiving member It hits. At this time, the connecting rod large end portion is broken by the impact load generated when the weight falls on the pressure receiving member and is transmitted from the wedge through the dividing jig, and is divided into the connecting rod main body and the cap.

  For this reason, the dividing apparatus for connecting rods according to the present invention has constant dividing conditions such as the weight of each connecting rod, the falling height, and the dropping path, and can divide a large number of connecting rods according to the same dividing condition. Therefore, the fracture split type connecting rod in which a good fracture surface is formed can be manufactured in a uniform manner.

Hereinafter, an embodiment of a connecting rod splitting device according to the present invention will be described in detail with reference to FIGS.
1A and 1B are diagrams showing a connecting rod splitting device according to the present invention, in which FIG. 1A is a side view and FIG. 1B is a front view. This figure shows a state when the connecting rod is loaded and unloaded, and in FIG. 1, the connecting rod support part and a part of the holding device are shown in a broken state. 2 is a plan view showing the structure of the holding device, FIG. 3 is an enlarged plan view showing the connecting rod support portion, FIG. 4 is a view showing the connecting rod support portion and the weight, and FIG. AA line sectional view and the figure (b) are BB line sectional views in FIG.

  5A and 5B are diagrams showing the connecting rod splitting device at the end of the preparation for splitting. FIG. 5A is a side view and FIG. 5B is a front view. FIG. 6 is a view showing the connecting rod support portion and the weight at the end of preparation for division, FIG. 7 is a view showing the connecting rod dividing device at the time of division, FIG. 6 (a) is a side view, and FIG. FIG. FIG. 8 is a view showing the connecting rod support portion and the weight when divided. FIG. 9 is a perspective view showing the dividing jig.

  In these drawings, the reference numeral 1 indicates a connecting rod splitting device according to this embodiment. In this dividing apparatus 1, a connecting rod main end 4 and a cap as shown in FIG. 8 (a) are connected to a connecting rod 2 (see FIGS. 3 and 4) of a connecting rod 2 (see FIGS. 3 and 4) assembled to a motorcycle engine (not shown). It is divided into 5 by breaking. The connecting rod 2 loaded in the connecting rod dividing apparatus 1 according to this embodiment is cooled in advance to −80 ° C. to −100 ° C. so as to be easily broken.

As shown in FIG. 1, the connecting rod dividing device 1 includes a base 7 installed on a floor surface 6 and a pressurizing device 8 mounted on the base 7.
The pressurizing device 8 includes four main guide rods 10 extending upward from a support stage 9 provided at the upper end portion of the base 7 and a weight 11 held up and down by the main guide rod 10. A holding device 12 provided at the upper end of the main guide rod 10, a pressure receiving device 13 provided on the support stage 9, and an air cylinder 14 positioned below the support stage 9. The driving device 15 is configured.

The base 7 has a structure in which the supporting stage 9 is supported by four legs 21 and is movably installed on a floor 6 such as a factory.
The main guide rod 10 includes a base 22 fixed to the support stage 9, a guide rod main body 23 extending upward from the base 22, a connecting plate 24 for connecting upper ends of the guide rod main bodies 23, and the like. It is constituted by. As shown in FIG. 1 (b), the base portion 22 is provided with a rubber stopper 25 at a portion below a weight 11 described later. The stopper 25 is configured to be separated downward from the weight 11 in the division preparation process shown in FIGS. 1 and 5 and to contact the lower surface of the weight 11 in the division process shown in FIG.

The guide rod body 23 is a rod having a circular cross section, and is fixed to the base 7 so that the axial direction is parallel to the vertical direction.
The connecting plate 24 is detachably attached to the upper end portion of the guide rod body 23 in a horizontally extending state. Further, a through hole 27 is formed at the center of the connecting plate 24 for inserting a support rod 26 of the weight 11 described later.

  The weight 11 includes four bosses 31 through which the guide rod body 23 penetrates, a weight 11 body 32 extending in a horizontal direction so as to connect the bosses 31, and a central portion of the weight body 32. The supporting rod 26 and the pressing element 33 are provided so as to project from the above. The boss 31 is fitted to the guide rod body 23 so as to be movable in the vertical direction. The weight main body 32 is formed to have a predetermined weight, is formed in a quadrangular shape in plan view, and the bosses 31 are welded to four corners.

In this embodiment, the pressing element 33 is formed in a cylindrical shape, and is welded to the lower surface of the weight body 32 so as to protrude downward.
The support rod 26 is a rod having a circular cross section, and is welded to the upper surface of the weight body 32 so as to protrude upward. The support rod 26 is formed so as to protrude upward from the connection plate 24 through the through hole 27 of the connection plate 24, and a positioning flange 34 is provided at the upper end portion. The outer diameter of the flange 34 is formed to be larger than the outer diameter of the support rod 26.

  The holding device 12 is for holding the support rod 26 (weight 11) in the raised position, and is supported by the connecting plate 24. As shown in FIGS. 1 and 2, the holding device 12 is provided with a pair of clamps 35, 35 sandwiching the support rod 26 from both sides, and extending to the side of the clamps 35, 35. A driven side rack 36, a pinion 37 meshing with the other end of the driven side rack 36, a driving side rack 38 meshing with a portion of the pinion 37 opposite to the driven side rack 36, and the driving side rack The air cylinder 39 etc. which reciprocately move 38 is comprised.

  The clamp 35 is movably supported by a guide rail 40 provided on the connecting plate 24 in parallel with the driven rack 36. The clamp 35 is provided so as to be positioned below the flange 34 in a state where the weight 11 is located at the raised position shown in FIG. 1 (b) and FIG. 5 (b)} and a retracted position {see FIG. 7 (b)} located outside the flange 34 in a plan view. According to the holding device 12, power is transmitted from the pinion 37 to the clamp 35 via the driven rack 36 by reciprocating the drive side rack 38 by the air cylinder 39, and the clamp 35 is connected to the guide rail. 40 moves forward and backward with respect to the support rod 26.

In the holding device 12, as shown in FIGS. 1B and 5B, the flange 35 (weight 11) is moved by moving the clamp 35 to the advance position approaching the support rod 26. The weight 11 can be held at the raised position by restricting the downward movement of the weight 11. As shown in FIG. 7B, this holding state is released when the clamp 35 is retracted to the retracted position.
The operation of the air cylinder 39 is controlled by a control device (not shown) of the dividing device 1.

As shown in FIGS. 1, 3, and 4, the pressure receiving device 13 includes a plate-like support member 41 fixed to the upper surface of the support stage 9, and four auxiliary members extending upward from the support member 41. A guide rod 42, a pressure receiving member 43 held by the sub guide rod 42 so as to be movable in the vertical direction, a wedge 44 provided at a lower end portion of the pressure receiving member 43, and a side portion of the pressure receiving member 43 downward. The rubber stopper 45 is provided so as to protrude.
As shown in FIG. 3, the support member 41 is formed in a quadrangular shape in plan view. The auxiliary guide rod 42 and the load receiving member 46 are provided at the upper corners of the support member 41 and at the four corners, and the first and second sliders 51 serving as split jigs are provided at the center. , 52 are detachably attached. The load receiving member 46 is for abutting a stopper 45 of a pressure receiving member 43 to be described later, and for restricting further downward movement of the pressure receiving member 43.

As shown in FIGS. 3 and 4, the first and second sliders 51 and 52 are supported by a base plate 53 so as to be movable in the longitudinal direction of the connecting rod 2, and are attached to the support member 41 through the base plate 53. Has been.
As shown in FIGS. 4 and 9, the base plate 53 is fitted in a concave groove 54 formed in the support member 41 and is fixed at a predetermined position by a holder 55 provided on the support member 41. .

  As shown in FIGS. 3, 4, and 9, the first slider 51 is fitted into a pin 57 that fits into the piston pin hole 56 of the connecting rod 2 and a crank pin hole 58 of the connecting rod large end 3. A half cylinder-shaped first pressing member 59 projects from the plate-like slider main body 60 and is configured to hold the connecting rod main body 4.

  As shown in FIGS. 3, 4, and 9, the second slider 52 includes a half-columnar second pressing member 61 that fits into the crankpin hole 58, and the second pressing member 61. A pressure receiving block 62 adjacent to the plate is protruded from the plate-like slider main body 63 and is configured to hold the cap 5.

The first pressing member 59 and the second pressing member 61 are formed so as to be separated from each other with a wedge insertion space 64 (see FIG. 3) in a state where the first pressing member 59 and the second pressing member 61 are fitted in the crankpin hole 58. As shown in FIG. 6, the wedge 44 is engaged in the space 64 in the division preparation process.
The first and second sliders 51 and 52 configured as described above have the pin 57 fitted in the piston pin hole 56 and the first and second pressing members 59 and 61 in the crank pin hole 58. Are connected to the pressure receiving device 13 together with the base plate 53 in a state in which the connecting rod 2 is mounted. Note that the connecting rod 2 is mounted by loading the first and second sliders 51 and 52 into the pressure receiving device 13 in advance, and then mounting the connecting rod 2 on the first and second sliders 51 and 52. You can also.

  The sub guide rod 42 of the pressure receiving device 13 is a rod having a circular cross section, and is erected on the support member 41 so that the axial direction is parallel to the vertical direction. A connecting plate 65 (see FIGS. 1 and 4) for connecting the sub guide rods 42 is fixed to the upper ends of the sub guide rods 42. A through hole 66 for inserting the pressing element 33 of the weight 11 is formed at the center of the connecting plate 65.

  As shown in FIG. 4, the pressure receiving member 43 includes four bosses 67 through which the sub guide rod 42 passes, and a pressure receiving member main body 68 formed in a quadrangular shape in plan view and provided with the bosses 31 at four corners. It consists of and. A lower projecting portion 68a projecting downward and an upper projecting portion 68b projecting upward are integrally formed at the central portion of the pressure receiving member main body 68. The wedge 44 is welded to the lower surface of the lower protrusion 68a so as to protrude downward, and a pressure receiving surface 69 made of a flat surface extending in the horizontal direction is formed at the upper end of the upper protrusion 68b. The wedge 44 is formed in a plate shape having both inclined surfaces, and the pressure receiving surface 69 is positioned below the pressing element 33 of the weight 11.

  The stoppers 45 provided at the lower end of the pressure receiving member 43 are provided adjacent to the bosses 31 at the four corners of the pressure receiving member 43 so as to overlap the load receiving member 46 in plan view. Is positioned. Further, the length of the stopper 45 in the vertical direction (the position of the lower end surface) is such that the wedge 44 is engaged between the first and second pressing members 59 and 61 as shown in FIG. It is set so as to be spaced apart from the load receiving member 46 and supported by the load receiving member 46 during the division shown in FIG.

  As shown in FIGS. 1, 5, and 7, the driving device 15 includes the air cylinder 14 supported on the base 7 by two support plates 71 extending downward from the support stage 9 of the base 7. And a connecting member 73 fixed to the tip of the piston rod 72 of the air cylinder 14 and extending to both sides, push rods 74 and 74 extending upward from both ends of the connecting member 73, and the like. . The air cylinder 14 is configured such that the operation timing is controlled by a control device that controls the operation of the air cylinder 39 of the holding device 12.

  The push rod 74 is positioned below the pressure receiving member 43 and overlaps with the pressure receiving member 43 in a plan view, and penetrates the support stage 9 and the support member 41 upward. It protrudes. Further, as shown in FIG. 1, the stroke length of the air cylinder 14 and the length of the push rod 74 are such that the pressure receiving member 43 is pushed upward by the push rod 74 in a state where the piston rod 72 is advanced to the uppermost side. Further, the weight 11 is pushed upward by the pressure receiving member 43 so that the flange 34 at the upper end thereof moves upward from the clamp 35 of the holding device 12.

  Further, as shown in FIGS. 5 and 7, the air cylinder 14 and the push rod 74 are separated from the pressure receiving member 43 at the upper end of the push rod 74 with the piston rod 72 retracted to the lowest side. It is configured as follows. At this time, the pressure receiving member 43 is restricted from moving downward because the wedge 44 is engaged between the first and second pressing members 59 and 61.

  In the connecting rod dividing device 1 configured as described above, the connecting rod 2 is loaded or unloaded in a state where the weight 11 and the pressure receiving member 43 are raised to the raised position shown in FIGS. 1 and 4 by the driving device 15. The At this time, the holding device 12 moves the clamp 35 to the advance position facing the support rod 26 with a movement clearance.

In order to divide the connecting rod large end portion 3 of the connecting rod 2 loaded in the state shown in FIGS. 1 and 4, the dividing device 1 first sets the push rod 74 of the driving device 15 in FIGS. 5 and 7. Retract to the lowest position as shown.
When the push rod 74 is retracted in this way, the weight 11 and the pressure receiving member 43 are also lowered. At this time, as shown in FIG. 5 (b), the weight 11 stops when the lower surface of the flange 34 provided at the upper end abuts against the clamp 35, so that the downward movement is restricted. Further, as shown in FIGS. 5B and 6, the pressure receiving member 43 is moved downward when the wedge 44 is engaged between the first and second pressing members 59 and 61 of the split jig. The movement to is restricted and stopped.

  The connecting rod splitting device 1 according to this embodiment is configured so that the presser 33 of the weight 11 and the upward projecting portion of the pressure receiving member 43 are in a state where the lowering of the weight 11 and the pressure receiving member 43 is stopped in the above-described split preparation process. It is configured to be separated with a drop height S (see FIG. 5B). That is, in the dividing device 1, the weights of the pressure receiving member 43 and the wedge 44 are applied to the connecting rod large end portion 3 in the above-described dividing preparation process.

  Next, as shown in FIG. 7, the dividing device 1 moves the clamp 35 of the holding device 12 to a retracted position away from the support rod 26. By the backward movement of the clamp 35, the holding state by the holding device 12 is released, and the weight 11 falls from the stop position by free fall. After the weight 11 falls by the drop height S, the pressing element 33 provided at the lower end of the weight 11 strikes the pressure receiving surface 69 of the pressure receiving member 43 from above.

Thus, when the pressure receiving member 43 is hit by the weight 11, the impact load is transferred from the pressure receiving member 43 through the wedge 44 and the first and second pressing members 59 and 61 of the split jig to the large end of the connecting rod. The connecting rod large end portion 3 is split into a connecting rod main body 4 and a cap 5 by breaking by a wedge action.
At the end of this splitting process, that is, after the connecting rod large end 3 is split, the weight 11 comes into contact with the rubber stopper 25 of the main guide rod 10 and the rubber stopper 45 of the pressure receiving device 13 is loaded on the support member 41. It abuts on the receiving member 46 and stops while the weight 11 and the pressure receiving member 43 are buffered.
Thereafter, the pressure receiving member 43 and the weight 11 are raised to the above-described raised position by the driving device 15, and the connecting rod body 4 and the cap 5 are carried out of the dividing device in this state.

  In the dividing apparatus 1, when the dividing condition is changed when dividing connecting rods of different sizes and types, the weight 11 is replaced with one having a weight corresponding to the dividing condition. For example, by increasing the weight 11 and changing the drop height S to be higher, even a relatively large connecting rod can be divided without lowering the speed required for the division.

  Therefore, according to the connecting rod dividing device 1 according to this embodiment, the connecting rod large end portion 3 can be divided by the impact load generated by the falling of the weight 11, so that the power for pressurizing the wedge 44 at the time of dividing is determined. The source is no longer needed. Therefore, the connecting rod dividing device 1 can be simplified in structure as compared with the conventional connecting rod dividing device configured to drive the wedge 44 by a hydraulic cylinder, an air cylinder, or the like.

Further, since the connecting rod dividing device 1 divides the connecting rod large end portion 3 by impact load, the speed required for dividing can be increased as compared with the case where the wedge is pressurized by hydraulic pressure, for example. A fracture surface can be easily obtained.
Furthermore, since the impact load can be easily adjusted by changing the weight of the weight 11 and the drop height S, the setup change when dividing connecting rods of different sizes and types can be performed in a short time. Can do.

  In the connecting rod dividing apparatus 1 according to this embodiment, the weight 11 is formed to have a weight of 150 kg, the pressure receiving member 43 is formed to have a weight of 50 kg, and the fall height S is set to 20 mm. When the connecting rod was divided, a good fracture surface was obtained.

It is a figure which shows the dividing apparatus for connecting rods concerning this invention. It is a top view which shows the structure of a holding | maintenance apparatus. It is a top view which expands and shows a connecting rod support part. It is a figure which shows a connecting rod support part and a weight. It is a figure which shows the dividing apparatus for connecting rods at the time of completion | finish of division | segmentation preparation. It is a figure which shows the connecting rod support part and weight at the time of completion | finish of division | segmentation preparation. It is a figure which shows the dividing apparatus for connecting rods at the time of a division | segmentation. It is a figure which shows the connecting rod support part and weight at the time of a division | segmentation. It is a perspective view which shows the jig | tool for a division | segmentation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Connecting rod splitting device, 2 ... Connecting rod, 3 ... Connecting rod large end, 7 ... Base, 8 ... Pressurizing device, 10 ... Main guide rod, 11 ... Weight, 12 ... Holding device, 13 ... Pressure receiving device, DESCRIPTION OF SYMBOLS 15 ... Drive apparatus, 43 ... Pressure receiving member, 44 ... Wedge, 51 ... 1st slider, 52 ... 2nd slider, 59 ... 1st pressing member, 61 ... 2nd pressing member, 69 ... Pressure receiving surface.

Claims (2)

  In a connecting rod fracture splitting device for splitting a connecting rod large end by press-fitting a wedge between a pair of split jigs fitted to the connecting rod large end, the wedge is moved downward by a free fall of a weight. A connecting rod splitting device comprising a pressurizing device for pressurizing. 2. The connecting rod splitting device according to claim 1, wherein a guide rod that regulates a moving direction of the weight in a vertical direction, a driving device that lifts the weight, and the weight is held at a rising position and the connecting rod is split when the rod is split. A connecting rod splitting device comprising: a holding device that releases a holding state; and a pressure receiving member that has a wedge at a lower end portion and a pressure receiving surface that contacts the weight at an upper end portion.

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