JP2004316574A - Flange fastening structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flange fastening structure for drastically reducing the number of bolts tightening an oil pan, eliminating the use of a gasket between the oil pan and a cylinder block, and enabling the removal of the oil pan from the cylinder block. <P>SOLUTION: In the flange fastening structure 30 for fastening a pair of flanges, the flange is provided with an adhesive application surface 35 for applying a liquid adhesive 34 having a sealing property on it, and a groove 36 surrounding the adhesive application surface 35 and a release agent pouring passage for pouring a release agent 48 from outside through the groove 36 are provided on a upper face 33 of the flange. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fastening structure capable of changing a flange from bolting to bonding.
[0002]
[Prior art]
A search of prior art document information was conducted using the international patent classification as a search field, but no corresponding document could be found. It seems that the reason for this is that the present invention is a technology in a very special field that has never been seen before.
Therefore, the present inventors will describe a conventional technique with reference to the drawings instead of the prior art document information.
[0003]
FIG. 9 is an exploded perspective view of a conventional flange fastening structure.
A bearing cap 103 is attached via a dowel pin 102 to a cylinder block 101 set so-called upside down so that a flange 105 for stopping an oil pan 107 faces upward, and the bearing cap 103 is tightened with a bearing cap fastening bolt 104 so that the cylinder block 101 The packing 106 is set on the upper surface 105 of the flange, and the knocking pin bolt 109 is set through the positioning hole 108 provided in the oil pan 107 on the packing 106, and tightened with the oil pan tightening nuts 111 (two places). A flange fastening structure in which the flange portion of the oil pan 107 is fastened at (16 locations) is known.
[0004]
[Problems to be solved by the invention]
However, according to this structure, the number of bolts 112 for tightening the oil pan 107 becomes large (for example, 16), and the packing 106 is separately required in order to secure the sealing property between the oil pan 107 and the cylinder block 101. There is a problem that the accompanying process, equipment, or assembly man-hours are required, which leads to an increase in engine cost.
[0005]
Therefore, an object of the present invention is to significantly reduce the number of bolts for tightening an oil pan, to eliminate the packing sandwiched between the oil pan and the cylinder block, and to make it possible to remove the oil pan from the cylinder block, a flange fastening structure. Is to provide.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention is a flange fastening structure for fastening a pair of flanges, wherein the flange has an adhesive application surface for applying a liquid adhesive having a sealing property to at least one of the flanges. A groove surrounding the surface coated with the agent and a release agent injecting passage through which the adhesive release agent can be guided from outside are provided.
[0007]
A liquid adhesive is applied to an adhesive application surface provided on the flange to fasten the pair of flanges, secure a fastening force required for flange fastening, and also have a sealing function against oil and gas.
Later, when the flange is to be removed, if necessary, the groove surrounding the adhesive application surface is filled with a release agent by a release agent injecting means, and the release agent filled in the groove is caused to act on the adhesive on the adhesive application surface. Release the sticking.
[0008]
According to a second aspect, the groove surrounding the adhesive application surface is a groove having a substantially semicircular cross-sectional shape, and this groove is connected to the adhesive application surface via a tapered groove.
Through the tapered groove, the release agent filled in the groove can be more smoothly directed to the adhesive applied surface. As a result, the peeling of the adhesive can be completed in a short time, and the work efficiency of the flange separating operation can be improved.
[0009]
According to a third aspect of the present invention, the groove surrounding the adhesive application surface is a groove having a substantially triangular cross section.
Since the release agent filled in the groove flows along the sides constituting the triangular cross section, it can be positively directed to the adjacent adhesive application surface. As a result, the peeling of the adhesive can be completed in a short time, and the work efficiency of the flange separating operation can be improved.
[0010]
If the triangle is a scalene triangle, it is preferable because the release agent can be flowed along the long side and the release agent can be more smoothly directed to the adhesive application surface.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals.
FIG. 1 is an exploded perspective view of a flange fastening structure according to the present invention, which will be described below by taking an example of a fastening structure between an engine cylinder block 11 and an oil pan 12.
[0012]
A typical cylinder block unit 10 includes a crankshaft 13 set on a cylinder block 11, a bearing cap 15 for pressing a bearing portion of the crankshaft 13 through a knock pin 20, a bearing cap tightening bolt 16 for fixing the bearing cap 15, and the like. , An oil pan 12 covering the cylinder block 11, and an oil pan tightening bolt 17 and a tightening nut 18 for fixing the oil pan 12 to the cylinder block 11.
14 is a knock pin bolt.
[0013]
Further, the flange fastening structure 30 of the cylinder block unit 10 includes an oil pan flange 31 and a cylinder block flange 32, and an adhesive application surface for applying a liquid adhesive 34 having a sealing property to a flange upper surface 33 of the cylinder block flange 32. 35 and a groove 36 surrounding the adhesive application surface 35.
Reference numeral 37 denotes a nipple for injecting a release agent.
[0014]
FIG. 2 is a plan view of the flange fastening structure according to the present invention, in which an adhesive application surface 35 and a groove 36 for passing a release agent 48 formed around the entire surface of the adhesive application surface 35 are formed on the flange upper surface 33. And a nipple 37 fixed by screwing into a tip of the release agent injection passage 38 for supplying a release agent 48 to the groove 36.
39 is an oil pan tightening hole, 41 is a connecting rod cap, and 42 is a connecting rod tightening bolt.
[0015]
In the flange fastening structure of the present invention, the equivalent products and components of the liquid adhesive 34 and the release agent 48 for peeling the liquid adhesive 34 are as follows.
Liquid adhesive 34:
Product name: Henkel Japan 5900 (silicone adhesive)
Component and concentration (numerical value is wt%)
Calcium carbonate 25-50
Polydimethylsiloxane terminated hydroxy 20-40
Polydimethylsiloxane, dimethyl 5-20
Oximinosilane 1-10
Silica powder 1-5
Carbon black 1-3
Stearic acid 0.5-1
[0016]
Release agent 48:
Product name: Gasket remover 7200 (gasket remover) manufactured by Henkel Japan K.K.
Component and concentration (numerical value is wt%)
Dimethoxymethane 50-60
1,3-dioxolane 5-15
Ethanol 5-10
Isopropyl alcohol 5-10
Solid paraffin 1-5
Ethanolamine 1.5
Methyl ethyl ketone 1-3
Propane 10-20
[0017]
FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 2. And a groove 36 through which a release agent having a width W2 and a depth D passes adjacently. The groove 36 is a semicircular cross-sectional groove. The semicircle forming the cross section may be a substantially semicircle, a part of a perfect circle, or a part of an ellipse.
[0018]
The width W1 of the adhesive application surface 35 can be determined by repeating tests based on the required pressure resistance and the performance of the adhesive.
Further, the width W2 and the depth D of the groove 36 through which the release agent passes are based on the amount of the release agent necessary to release the liquid adhesive and release the adhesion of the flange 32 and the results of a plurality of tests. You can decide.
[0019]
FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 2. The cylinder block flange 32 has a groove 36 for allowing the release agent to pass in the front and back direction of the drawing as described above. In order to perform this operation, the release agent entrance passage hole 43, the release agent injection passage hole 44 intersected at right angles to the release agent entrance passage hole 43, and the flange end face of the cylinder block flange 32 at the entrance of the release agent entrance passage hole 44. The nipple 37 is provided with a release agent injection port 46 at the tip of the nipple 37.
A stop ball 47 was pressed into the end of the release agent entrance passage hole 43 to stop the release agent from flowing out.
[0020]
FIGS. 5A and 5B are explanatory views of the operation of the flange fastening structure at the time of applying the adhesive. The adhesive applied surface 35 is cleaned and dried in advance.
In (a), the liquid adhesive 34 is applied over the entire circumference of the flange 32 along the adhesive application means 51 such as an adhesive application gun on the adhesive application surface 35.
Since the applied liquid adhesive 34 can also have a sealing function, the packing sandwiched for sealing can be eliminated.
[0021]
In (b), the oil pan flange 31 of the oil pan 12 is put on the cylinder block flange 32 to which the liquid adhesive 34 has been applied. The positioning of the oil pan 12 is performed by aligning the positioning holes of the oil pan 12 with the knock pin bolts 14 vertically raised on the upper surface 33 of the flange of the cylinder block 11.
[0022]
Next, the oil pan flange 31 and the flange surface 32 of the cylinder block 11 are pressure-bonded with a predetermined force. Further, a tightening nut 18 is attached to the knock pin bolt 14 rising vertically to the flange surface 32 of the cylinder block 11, and tightened with a predetermined torque, and the oil pan flange 31 is fixed with the tightening nut 18.
After the oil pan flange 31 is tightened, it is left at a predetermined temperature until the liquid adhesive 34 dries and obtains a predetermined fastening force. As a result, a necessary fastening force can be obtained between the oil pan flange 31 and the flange upper surface 33 of the cylinder block 11, so that the number of fastening bolts can be greatly reduced.
[0023]
FIGS. 6A to 6C are explanatory views of the operation of the flange fastening structure at the time of injecting the release agent.
In (a), the tightening nut 32 holding the oil pan flange 31 is loosened and removed from the knock pin bolt 14, and the release agent injection port 46 of the nipple 37 attached to the flange end surface 45 of the cylinder block 11 is peeled by a release agent injection gun or the like. The release agent 48 is reciprocated in the direction of the arrow a in the figure by hitting the nozzle 52 of the agent injection means 51 and the lever 53 of the release agent injection means 51 intersects the release agent injection passage hole 44 and the release agent injection passage hole 44 perpendicularly. The groove 36 provided on the flange upper surface 33 of the cylinder block 11 is filled with the release agent 48 through the release agent entrance passage hole 43.
[0024]
The release agent injection means 51 is not limited to a release agent injection gun, and a power type liquid injection device or the like may be used as necessary. Depending on the properties of the release agent 48, the release effect can be enhanced by forcibly circulating the release agent 48 using the nipples 37 provided at two locations.
[0025]
In (b), a release agent 48 is filled in the release agent injection passage hole 44, the release agent entrance passage hole 43, and the groove 36, and the release agent 48 is supplied from the groove 36 to the liquid adhesive on the adhesive application surface 35. At 34, the liquid adhesive 34 is deteriorated by a chemical reaction between the liquid adhesive 34 and the release agent 48, and the fastening force between the oil pan flange 31 and the flange upper surface 33 of the cylinder block 11 is greatly reduced.
[0026]
In (c), when the fastening force between the oil pan flange 31 and the flange upper surface 33 of the cylinder block 11 decreases, the oil pan 12 is lifted to separate the oil pan flange 31 from the flange upper surface 33 of the cylinder block 11.
Next, the release agent 48 remaining in the groove 36 provided on the upper surface 33 of the flange of the cylinder block 11 and the liquid adhesive 34 remaining on the adhesive application surface 35 are removed, and the operation of disassembling the flange is completed. I do.
[0027]
As a result, the oil pan flange 31 and the flange upper surface 33 of the cylinder block 11 can be separated by the action of the release agent 48 filled in the groove 36, and the flange can be opened when necessary.
[0028]
FIGS. 7A to 7C are views of another embodiment of FIG. 3. The cylinder block flange 32 has an adhesive application surface 35 having a width W1 on a flange upper surface 33 and a release agent having a depth W having a width W2. And grooves 36A, 36B and 36C through which the holes pass.
[0029]
In (a), a groove 36A having a semicircular cross section having a width W2 is provided on the flange upper surface 33 at a distance W3 from the adhesive application surface 35 having a width W1. Then, a tapered groove 36a is provided in a portion of the distance W3. That is, the tapered groove 36a is a tapered cross-sectional groove in which the groove 36A is deeper and shallower toward the adhesive application surface 35. As a result, the release agent filled in the groove 36A can be smoothly guided to the adhesive release surface 35.
[0030]
In (b), the width W1 of the adhesive application surface 35 is determined, and the width W2 and the depth D of the groove 36B through which the release agent passes are determined based on the amount of the release agent necessary for releasing the liquid adhesive. The sectional shape of the groove 36B is W2 = 2Wa = 2Wb, that is, an inverted isosceles triangular sectional groove, so that the action of the release agent on the liquid adhesive can be adjusted.
[0031]
In (c), the groove 36C is a trapezoidal triangular cross-sectional groove formed by the short side 36b and the long side 36c. That is, Wa> Wb is satisfied, and the inclination of the long side 36c is moderated, so that the release agent filled in the groove 36C can be easily directed to the adhesive application surface 35. The groove 36C of (c) requires more processing man-hours than that of (b), but is superior in controlling the flow direction of the release agent.
[0032]
FIG. 8 is an exploded perspective view of another embodiment of FIG. 1 and shows a fastening structure of an engine cylinder block 11 and an oil pan 12, and a lower block for attaching a crankshaft 13 to the cylinder block 11 and pressing a bearing of the crankshaft 13. 19 is set via a dowel pin 20, the oil pan 12 is placed on the lower block 19, and the dowel pin 14 with the oil pan 12 erected on the upper surface 21 of the flange of the lower block 19 is tightened with an oil pan tightening nut 18. is there.
[0033]
The flange fastening structure 30 includes an oil pan flange 31 and a lower block 19, and the upper flange surface 22 of the lower block 19 has an adhesive application surface 35 on which a liquid adhesive 34 having a sealing property is applied, and an adhesive application surface 35. And a groove 36 surrounding the groove 36.
Reference numeral 37 denotes a nipple for injecting the release agent 48.
[0034]
A liquid adhesive 34 is applied to the upper surface 22 of the flange of the lower block 19 to fasten the pair of flanges, thereby securing a fastening force required for fastening the flanges, and also having a sealing function against oil and the like.
When the flange is removed for maintenance or the like, the groove 36 surrounding the adhesive application surface 35 is filled with a release agent. The release agent filled in the groove 36 acts on the liquid adhesive 34 on the adhesive application surface 35, and the flange is removed. The fastening can be released, and the oil pan 12 can be removed.
[0035]
Further, the number of bolts for tightening the oil pan 12 can be significantly reduced, and the packing sandwiched between the oil pan 12 and the cylinder block 11 can be eliminated. Along with this, it is not necessary to machine a bolt fastening hole or a screw hole on the flange opened for fixing the flange, and it is possible to reduce the cost of machining the hole of the flange and the cost of assembling the bolt.
[0036]
The cross-sectional shape and dimensions of the flange fastening structure 30 may be changed according to conditions such as required crimping strength, oil resistance, and heat resistance.
[0037]
Further, the present invention can be widely applied not only to the oil pan 12 of the engine but also to a closed container which needs to be opened in order to modify the inside for maintenance or the like.
[0038]
【The invention's effect】
The present invention has the following effects by the above configuration.
The first aspect is characterized in that the fastening of the flange is changed from a bolt to an adhesive. In addition, since the flange needs to be released in a timely manner, the flange is provided with a release agent injection passage through which a release agent can be supplied.
As a result, the packing between the flanges can be eliminated, the bolts can be eliminated or the number of bolts can be reduced, and the assembly cost for fastening the flange can be reduced.
[0039]
According to a second aspect, the groove surrounding the adhesive application surface is a groove having a substantially semicircular cross-sectional shape, and this groove is connected to the adhesive application surface via a tapered groove.
Through the tapered groove, the release agent filled in the groove can be more smoothly directed to the adhesive applied surface. As a result, the peeling of the adhesive can be completed in a short time, and the work efficiency of the flange separating operation can be improved.
[0040]
According to a third aspect of the present invention, the groove surrounding the adhesive application surface is a groove having a substantially triangular cross section.
Since the release agent filled in the groove flows along the sides constituting the triangular cross section, it can be positively directed to the adjacent adhesive application surface. As a result, the peeling of the adhesive can be completed in a short time, and the work efficiency of the flange separating operation can be improved.
[0041]
If the triangle is a scalene triangle, it is preferable because the release agent can be flowed along the long side and the release agent can be more smoothly directed to the adhesive application surface.
[Brief description of the drawings]
1 is an exploded perspective view of a flange fastening structure according to the present invention; FIG. 2 is a plan view of the flange fastening structure according to the present invention; FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2; FIG. 5 is an explanatory view of the operation of the flange fastening structure when the adhesive is applied. FIG. 6 is an explanatory view of the operation of the flange fastening structure when the release agent is injected. FIG. 7 is another embodiment view of FIG. 8 is an exploded perspective view of another embodiment of FIG. 1. FIG. 9 is an exploded perspective view of a conventional flange fastening structure.
DESCRIPTION OF SYMBOLS 10 ... Cylinder block unit, 11 ... Cylinder block, 30 ... Flange fastening structure, 31 ... Oil pan flange, 32 ... Cylinder block flange, 33 ... Cylinder block flange upper surface, 34 ... Liquid adhesive, 35 ... Adhesive application surface, 36 , 36A, 36B, 36C ... groove, 37 ... nipple, 48 ... release agent

Claims (3)

In a flange fastening structure for fastening a pair of flanges,
The flange has an adhesive application surface for applying a liquid adhesive having a sealing property,
A flange fastening structure, wherein at least one of the flanges is provided with a groove surrounding the adhesive-applied surface and a release agent injection passage for guiding an adhesive release agent from the outside to the groove. The flange fastening structure according to claim 1, wherein the groove surrounding the adhesive application surface is a groove having a substantially semicircular cross-sectional shape, and the groove is connected to the adhesive application surface via a tapered groove. 2. The flange fastening structure according to claim 1, wherein the groove surrounding the adhesive application surface is a groove having a substantially triangular cross-sectional shape.

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