JPH06182634A - Crank pin press-fitting jig - Google Patents

Abstract

PURPOSE:To highten the accuracy at the time of press-fitting a crank pin so as to improve the efficiency of assembling a crankshaft, and to provide a crank pin press-fitting jig which can be produced in small quantities economically and efficiently. CONSTITUTION:A crank pin press-fitting jig main body 36 is provided separately from a lower jig 10 where both right and left crankshaft parts 14 are mounted, taking a pin hole 18 as a reference and an upper jig 11. A magnet 37 and a reference hole 38 are provided on the upper part of the jig main body 36, and a crank pin 13 is removably provided on the lower part thereof. When the crank pin 13 is press-fitted in the pin hole 18 of the left crankshaft part 14, a reference hole 38 is fitted to a reference pin 29 of the upper jig 11, and the jig main body 36 is positioned and fixed on the upper jig 11 by the magnet 37, and when the right crankshaft part 15 is fitted to the upper jig 11, the jig main body 36 is detached from the upper jig 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crankpin press-fitting jig used for press-fitting a crankpin into a crankshaft portion.

[0002]

2. Description of the Related Art A conventional crankshaft is assembled by connecting crankshaft portions on both left and right sides through crankpins for attaching a connecting rod. For example, in order to assemble the crankshaft 51 by the assembly method as shown in FIGS. 8 and 9, first, the left crankshaft portion 52 is attached to the lower jig 55 based on the journal 53 and the pin hole 54, and the right side The crankshaft portion 56 is attached to the upper jig 59 with reference to the journal 57 and the pin hole 58. Then, the crank pin 60 is placed together with the connecting rod 61 on the pin hole 54 of the left crank shaft portion 52. When the upper jig 59 is lowered in this state, the crank pin 60 is press-fitted into the pin holes 54 and 58 of the left and right crankshaft portions 52 and 56, and the left and right crankshaft portions 52 and 56 are accordingly pushed. Will be combined.

In order to assemble the crankshaft 51 by the assembling method shown in FIGS. 10 and 11, first, the left crankshaft portion 52 is attached to the lower jig 55 with the journal 53 and the pin hole 54 as a reference. At the same time, the crank pin press-fitting jig 62 to which the crank pin 60 is attached is fastened and fixed to the upper base 63. Then, by lowering the press fitting jig 62, the crank pin 60 is press fitted into the pin hole 54 of the left crank shaft portion 52. Next, the crank pin press-fitting jig 62 is replaced with the upper jig 59, and the right crank shaft portion 56 is attached to the upper jig 59 with reference to the journal 57 and the pin hole 58. After that, the connecting rod 61 is inserted into the crank pin 60, and the crank pin 60 is press-fitted into the pin holes 54 and 58 of the left and right crank shaft portions 52 and 56 by the same procedure as the above-described assembly method. , 56 will be combined.

[0004]

However, in the method of assembling the crankshaft 51 shown in FIGS. 8 and 9,
In connecting the left and right crankshaft parts 52 and 56, the crankpin 60 is simply placed on the left crankshaft part 52, so that the crankpin 60 is prone to fall down during press fitting, and the left and right crankshaft parts are also laid down. There is a problem that the parallelism between the journals 53 and 57 of 51 and the crank pin 60 and the runout accuracy of these journals 53 and 57 are likely to deteriorate. Also,
In the assembling method of the crankshaft 51 shown in FIGS. 10 and 11, the crankpin 60 fills the pin hole 54 of the left crankshaft portion 52. , The left and right crankshaft parts 5
The runout accuracy of the journals 53 and 57 in Nos. 2 and 56 may be deteriorated. In addition to that, since a laborious work of exchanging the crankpin press-fitting jig 62 and the upper jig 59 is required, the press-fitting work takes time and the efficiency of the assembling work cannot be improved.

The present invention has been made in view of the above circumstances, and an object thereof is to improve the accuracy when press-fitting the crank pin, improve the workability of assembling the crank shaft, and economically in a small amount production. It is to provide a jig for press-fitting a crank pin that can be efficiently performed.

[0006]

In order to solve the above-mentioned problems of the prior art, in the present invention, one crankshaft portion of a crankshaft connected by a crankpin is mounted on the basis of a pin hole. The side jig and the crank pin press-fitting jig body separately provided for both jigs of the upper jig and the other crank shaft part that is attached based on the pin hole are provided on the upper side of the jig body. A jig mounting magnet and a reference hole are provided, and the crank pin is detachably attached to the lower portion of the jig body, and the crank pin is provided in a pin hole of one crankshaft portion installed in the lower jig. When press-fitting, press the reference hole of the jig body into the reference pin of the upper jig for positioning, and fix the jig body to the upper jig with the magnet. When the crank pin is press-fitted into the pin hole of the one crankshaft portion and the other crankshaft portion is attached to the upper jig, the jig main body is detached from the upper jig. ing.

[0007]

According to the crank pin press-fitting jig of the present invention, one of both crank shafts constituting the crank shaft is separately provided with respect to the upper and lower jigs which are mounted with reference to the pin holes. A main body is provided, a magnet and a reference hole are provided on the upper part of the jig main body, and a crank pin is detachably attached to the lower part of the main body. When press-fitting the crank pin, the reference hole of the jig body is fitted into the reference pin of the upper jig for positioning,
When the jig body is fixed to the upper jig by the magnet and the crank pin is press-fitted into the pin hole of the one crankshaft portion, and the other crankshaft portion is attached to the upper jig. Since the jig main body is configured to be removed from the upper jig, the crank pin can be surely press-fitted into the pin holes of the both crankshaft portions with high accuracy, and the jig is The main body can be easily and quickly attached to and removed from the upper jig.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.

1 to 7 show an embodiment of a crank pin press-fitting jig according to the present invention. In the figure, 1 is a lower base on which guide shafts 2 are erected on both left and right sides, and 3 is an upper base that is disposed above and facing the lower base 1, and on both left and right sides of this upper base 3. Has a guide hole 4 through which the guide shaft 2 is inserted.
Further, the lower base 1 is attached to the base body 6 of the pressing device 5, and the upper base 3 is clamped and fixed to the press-fitting ram 7. The press-fitting ram 7 is guided to the front, rear, left and right ram guides 8 by a driving means (not shown). It is configured to go up and down while being operated. It should be noted that stopper collars 9 are fitted on the outer periphery of the guide shaft 2, and the lengths of these stopper collars 9 are formed according to the press-fitting dimension of a crank pin described later. A general-purpose machine is used as the press device 5.

A lower jig 10 is attached to the lower base 1 described above, and an upper jig 11 is attached to the upper base 3. The lower jig 10 and the upper jig 11 are connected to the crankshaft 12. It is used when assembling. The crankshaft 12 is assembled by connecting a left crankshaft portion 14 and a right crankshaft portion 15 with a crank pin 13, and one left crankshaft portion 14 is attached to the lower jig 10 and the other right crankshaft portion 15 is assembled. The shaft portions 15 are attached to the upper jig 11, respectively. Further, the left and right crankshaft portions 14 and 15 are provided with journals 16 and 17 supported by the main bearings and pin holes 18 and 19 into which the crankpin 13 is press-fitted. The lower base 1 and the upper base 3 are provided with insertion holes 1a and 3a for inserting the shaft portions of the left and right crankshaft portions 14 and 15, respectively.

However, the lower jig 10 is positioned and fixed to the lower base 1 by a plurality of positioning pins 20, and the reference pin 21 has a tip portion 21a at the center thereof at the lower jig 10. It is embedded so that it can move up and down while protruding from the upper surface of the. Therefore, the guide pin 22 and the compression spring 23 are arranged inside the reference pin 21 along the vertical direction, and the reference pin 21 is always urged upward by the urging force of the compression spring 23.

Further, a concave portion 24 extending in the vertical direction is formed on the outer peripheral surface of the reference pin 21, and the concave portion 24 is formed.
The reference pin 21 is prevented from slipping out of the lower jig 10 by the engagement of the tip of the retaining pin 25. Therefore, the retaining pin 25 is arranged inside the lower jig 10 along the horizontal direction. The lower jig 1
0, the journal 16 of the left crankshaft portion 14
A positioning hole 26 for inserting and arranging is formed along with the reference pin 21.

On the other hand, the upper jig 11 has a positioning pin 27.
Also, the reference pin 29, which is fixed to the upper base 3 by means of a fastening bolt 28 and is similar to the lower jig 10 in the center, has its tip 29a projected from the upper surface of the upper jig 11. It is buried so that it can move up and down. For this reason,
Inside the reference pin 29, a guide pin 30 and a compression spring 31 are arranged along the vertical direction, and the reference pin 29 is constantly urged downward by the urging force of the compression spring 31.

A concave portion 32 extending in the vertical direction is formed on the outer peripheral surface of the reference pin 29, and the concave portion 32 is formed.
The reference pin 29 is prevented from slipping out of the upper jig 11 by the engagement of the tip of the retaining pin 33. Therefore, the retaining pin 33 is arranged inside the lower jig 10 along the horizontal direction. The lower jig 1
0, the journal 16 of the left crankshaft portion 14
A positioning hole 34 for inserting and arranging is formed alongside the reference pin 29.

The crank pin 13 is provided with a crank pin press-fitting jig 35 on both left and right crank shaft portions 1.
The pin holes 18 and 19 of 4 and 15 are press-fitted. The press-fitting jig 35 includes a block-shaped crankpin press-fitting jig main body 36 that is separately provided for the lower jig 10 and the upper jig 11, and the jig main body 36 is used for a working process. Together, they are detachably fixed to the lower surface of the upper jig 11. On the upper left side of the jig main body 36, a magnet 37 is buried flush with the upper surface of the jig main body 36 with the upper surface exposed, and at the center position, the tip portion of the reference pin 29 of the upper jig 11 is located. A reference hole 38 into which 29a is fitted is provided. The reference hole 38 is provided for positioning the jig body 36 by fitting with the reference pin 29.

A mounting hole 39 for inserting and mounting the one end portion 13a of the crank pin 13 is provided coaxially with the reference hole 38 in the lower portion of the jig body 36. A ball plunger 40, which prevents the crank pin 13 from coming off, is attached to the lower right side of the jig body 36. The ball plunger 40 is arranged in a direction orthogonal to the axis of the attachment hole 39, and its tip end is arranged. The part is configured to lightly contact the outer peripheral surface of the crankpin 13. Therefore, the crank pin 13 is attached by the ball plunger 40 in a detachable state, and the other end 13b is arranged so as to project from the lower surface of the jig body 36 to a predetermined position. One end of the connecting rod 41 is connected to the intermediate portion 13c of the crankpin 13.

Next, the step of press-fitting the crankpin 13 using the above-mentioned crankpin press-fitting jig 35 will be described.

First, the left crankshaft portion 14 of the crankshaft 12 is placed on the upper surface of the lower jig 10, and the journal 16 is inserted into the positioning hole 26 as shown in FIG. The left crankshaft portion 14 is fitted into the tip portion 21a and the left crankshaft portion 14 is attached to the lower jig 1
Position 0 and install. Next, the jig body 36 of the crankpin press-fitting jig 35 is lifted to fit the reference hole 38 into the tip end portion 29a of the reference pin 29 of the upper jig 11 and positioned, and the magnet 37 is used to position the jig body 36 on the upper side. Ingredient 1
Fix it to the lower surface of 1. Then, the one end portion 13a of the crank pin 13 is inserted into the mounting hole 39, and the ball plunger 4
The crank pin 13 is attached to the jig body 36 by tightening 0.

In this state, when the press-fitting ram 7 of the pressing device 5 is driven to lower the upper base 3 toward the lower base 1, the crank pin 13 attached to the jig main body 36 is also removed. The end portion 13b is press-fitted into the pin hole 18 of the left crankshaft portion 14 installed on the lower jig 10. The press-fitting operation is stopped midway as shown in FIG. 2, and the tip end portion 21a of the reference pin 21 of the lower jig 10 is maintained in the pin hole 18 of the left crankshaft portion 14.

Next, the press-fitting ram 7 of the pressing device 5 is driven to raise the upper base 3 and thereby the jig main body 3
6 and the upper jig 11 are separated from the lower jig 10. Then, with the other end 13b of the crank pin 13 being press-fitted into the pin hole 18 of the left crankshaft portion 14, the one end 13a is detached from the mounting hole 39 of the jig body 36 and comes out. In this state, the jig body 36 is removed from the upper jig 11 as shown by the arrow in FIG.
5 is placed below the upper jig 11. Then, the journal 17 of the right crankshaft portion 15 is inserted into the positioning hole 34, and the pin hole 19 is fitted into the tip portion 29a of the reference pin 29 to position the right crankshaft portion 15 on the lower surface of the upper jig 11. Then install. Further, the connecting rod 41 is inserted into the crank pin 13 press-fitted into the left crankshaft portion 14, and the connecting rod 41 is placed on the upper surface of the left crankshaft portion 14. Then, the connecting rod 41 is arranged in the intermediate portion 13c of the crankpin 13.

Thereafter, when the press-fitting ram 7 of the pressing device 5 is driven to lower the upper base 3 toward the lower base 1, one end portion 13a of the crank pin 13 is inserted into the pin hole 19 of the right crank shaft portion 15. Pressed in. Further, the other end portion 13b of the crank pin 13, which is stopped in the pin hole 18 of the left crank shaft portion 14 on the way, is also press-fitted to the finished size. As a result, the left and right crankshaft portions 14 and 15 are joined via the crankpin 13 with the connecting rod 41 attached, as shown in FIG. 4, and the crankshaft 12 is assembled. Then, by driving the press-fitting ram 7 of the pressing device 5 and raising the upper base 3, the crankshaft 12 can be taken out from the lower jig 10.

In the crank pin press-fitting jig 35 of this embodiment, the magnet 37 and the reference hole 38 are provided in the upper portion of the jig body 36, and the crank pin 13 is detachably attached in the lower portion of the jig body 36. Therefore, the jig body 36
The attachment work and the removal work for the upper jig 11 can be easily performed, and the jig body 36 can be reliably positioned. Moreover, since the jig main body 36 can be quickly attached and detached, the right crankshaft portion 15 is fixed before the screw lock applied when the crank pin 13 is press-fitted is fixed.
Can be completed.

Further, since the crank pin 13 is press-fitted halfway by the dedicated jig body 36, the precision at the time of press-fitting can be improved. In addition, the crank pin 13
The press-fitting of the left side crankshaft portion 14 is left unfilled by the crank pin 13, and the left and right side crankshaft portions 14 and 15 are both assembled when the journals 16 and 17 are combined. And pin hole 1
Since the positioning is performed by 8 and 19, the positional deviation between the left crankshaft portion 14 and the right crankshaft portion 15 is unlikely to occur, and the crankshaft 12 can be assembled with higher accuracy.

The embodiment of the present invention has been described above.
The present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention. For example, the assembly procedure of the crankshaft 12 in the above-described embodiments is However, the present invention is not limited to that of the present embodiment, and can be arbitrarily selected.

[0025]

As described above, the crank pin press-fitting jig according to the present invention includes a lower jig to which one crank shaft portion of the crank shaft connected by the crank pin is attached with reference to the pin hole. The other crankshaft is equipped with a crank pin press-fitting jig body that is separately provided for both jigs of the upper jig that is attached based on the pin hole. A magnet and a reference hole are provided, the crank pin is detachably attached to the lower part of the jig body, and the crank pin is press-fitted into a pin hole of one crankshaft portion installed in the lower jig. At this time, the reference hole of the jig body is fitted into the reference pin of the upper jig for positioning,
When the jig main body is fixed to the upper jig by the magnet and the crank pin is press-fitted into the pin hole of the one crankshaft portion, when the other crankshaft portion is attached to the upper jig, Since the jig body is configured to be removed from the upper jig, the jig body can be accurately positioned with the reference pin of the upper jig, and the crank pin can be inserted into the pin holes of both crankshafts. The press-fitting can be performed with high accuracy, and as a result, the crankshaft assembly accuracy can be improved, and the small-quantity production including trial manufacture can be economically and efficiently performed. Further, since the crank pin press-fitting jig of the present invention can easily and quickly attach and detach the jig body to and from the upper jig, the crank pin press-fitting work time can be shortened as compared with the conventional one, and the workability can be improved. Can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a state before a crank pin press-fitting jig according to an embodiment of the present invention is attached to an upper jig.

FIG. 2 is a cross-sectional view showing a state in which a crank pin is press-fitted halfway into a pin hole of a left crank shaft portion by the crank pin press-fitting jig.

FIG. 3 is a cross-sectional view showing a state in which the crank pin press-fitting jig is removed from the upper jig while the crank pin is still press-fitted in the pin hole of the left crankshaft portion.

FIG. 4 is a cross-sectional view showing a state where the crankshaft is assembled by connecting the left and right crankshaft portions with the crankpin.

FIG. 5 is a cross-sectional view showing the pressing apparatus with an upper jig and a lower jig according to an embodiment of the present invention attached.

6 is a cross-sectional view taken along the line AA in FIG.

7 is a sectional view taken along line BB in FIG.

FIG. 8 is a cross-sectional view showing a state in which left and right crankshaft portions are attached to an upper jig and a lower jig used in a conventional crankshaft assembling method.

FIG. 9 is a cross-sectional view showing a state in which the left and right crankshaft portions are joined together by a crankpin used in the conventional assembling method to assemble the crankshaft.

FIG. 10 is a cross-sectional view showing a state in which a crank pin and a left crank shaft portion are attached to a crank pin press-fitting jig and a lower jig, which are used in another conventional assembly method, in association with each other.

FIG. 11 is a cross-sectional view showing a state in which the crank pin press-fitting jig is replaced with an upper jig and a right crankshaft portion is attached to the upper jig.

[Explanation of symbols]

 1 Lower Base 2 Guide Shaft 3 Upper Base 4 Guide Hole 5 Pressing Device 9 Stopper Collar 10 Lower Jig 11 Upper Jig 12 Crank Shaft 13 Crank Pin 14 Left Crank Shaft Part 15 Right Crank Shaft Part 16, 17 Journal 18, 19 pin hole 20,27 positioning pin 21,29 reference pin 22,30 guide pin 23,31 compression spring 24,32 recess 25,33 retaining pin 26,34 positioning hole 28 tightening bolt 35 crankpin press fitting jig 36 Crank pin press-fitting jig body 37 Magnet 38 Reference hole 39 Mounting hole 40 Ball plunger 41 Connecting rod

[Procedure amendment]

[Submission date] October 15, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

However, the lower jig 10 is positioned and fixed to the lower base 1 by a plurality of positioning pins 20, and the reference pin 21 has a tip portion 21a at the center thereof at the lower jig 10. It is embedded so that it can move up and down while protruding from the upper surface of the. Therefore, the compression spring 23 is arranged in the spring hole 22 provided inside the reference pin 21 along the vertical direction, and the reference pin 21 is constantly urged upward by the urging force of the compression spring 23. There is.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

On the other hand, the upper jig 11 has a positioning pin 27.
Also, the reference pin 29, which is fixed to the upper base 3 by means of a fastening bolt 28 and is similar to the lower jig 10 in the center, has its tip 29a projected from the upper surface of the upper jig 11. It is buried so that it can move up and down. For this reason,
A compression spring 31 is arranged in a vertical direction in a spring hole 30 provided inside the reference pin 29.
The reference pin 29 is constantly urged downward by the urging force of the compression spring 31.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

A concave portion 32 extending in the vertical direction is formed on the outer peripheral surface of the reference pin 29, and the concave portion 32 is formed.
The reference pin 29 is prevented from slipping out of the upper jig 11 by the engagement of the tip of the retaining pin 33. Therefore, the retaining pin 33 is arranged inside the upper jig 11 along the horizontal direction. The upper jig 1
1, the journal 17 of the right crankshaft portion 15
A positioning hole 34 for inserting and arranging is formed alongside the reference pin 29.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

The crank pin 13 is provided with a crank pin press-fitting jig 35 on both left and right crank shaft portions 1.
The pin holes 18 and 19 of 4 and 15 are press-fitted. The press-fitting jig 35 includes a block-shaped crankpin press-fitting jig main body 36 that is separately provided for the lower jig 10 and the upper jig 11, and the jig main body 36 is used for a working process. Together, they are detachably fixed to the lower surface of the upper jig 11. On the upper left side of the jig body 36, two magnets 37 are buried flush with the upper surface of the jig body 36 with the upper surfaces exposed, and the reference pin 29 of the upper jig 11 is located at the center position. A reference hole 38 into which the tip end portion 29a of the above is fitted is provided. This reference hole 38
By fitting the reference pin 29 to the jig body 3
It is provided for positioning 6.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of reference numerals] 1 lower base 2 guide shaft 3 upper base 4 guide hole 5 press device 9 stopper collar 10 lower jig 11 upper jig 12 crankshaft 13 crankpin 14 left crankshaft portion 15 right crankshaft portion 16 , 17 Journal 18, 19 Pin hole 20, 27 Positioning pin 21, 29 Reference pin 22, 30 Spring hole 23, 31 Compression spring 24, 32 Recess 25, 33 Retaining pin 26, 34 Positioning hole 28 Tightening bolt 35 Crank pin Press-fitting jig 36 Crank pin Press-fitting jig body 37 Magnet 38 Reference hole 39 Mounting hole 40 Ball plunger 41 Connecting rod

Claims (1)

[Claims] 1. A lower jig to which one crankshaft portion of a crankshaft connected by a crankpin is attached with reference to a pin hole, and an upper jig to which the other crankshaft portion is attached with reference to a pin hole. A jig pin press-fitting jig body separately provided for both jigs of the tool is provided, and a jig mounting magnet and a reference hole are provided at an upper portion of the jig body, and the crank pin is provided at a lower portion of the jig body. When the crank pin is press-fitted into the pin hole of the one crankshaft part installed in the lower jig, attach the pin so that it can be pulled out, and align the reference hole of the jig body with the reference hole of the upper jig. While fitting and positioning, the jig body is fixed to the upper jig by the magnet, and the crank pin is press-fitted into the pin hole of the one crankshaft portion, A crankpin press-fitting jig, characterized in that the jig body is detached from the upper jig when the other crankshaft portion is attached to the upper jig.