JP2012255513A - Structure for joining metal member to synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for joining a metal member to a synthetic resin member to thereby enhance adhesive strengths, by using a sealer member with simple equipment.SOLUTION: In the structure for joining the metal member to the synthetic resin member 11, a large number of recesses 30 are formed on the surface of the synthetic resin member 11. The sealer member 12 is affixed between the metal member and the synthetic resin member 11 while enabling the surface where the recesses 30 are formed to face the surface of the metal member. In the joining structure, the sealer member 12 comes into the recesses 30, and the sealer member 12 joins the metal member to the synthetic resin member 11.

Description

  The present invention relates to a joint structure for joining a metal member and a synthetic resin member using a sealer member. For example, the present invention relates to a joining structure used for joining a car engine body and a timing chain cover.

  Conventionally, in an automobile engine, in order to improve heat resistance and improve the bonding strength and secure the sealing performance in joining the engine body and the timing chain cover and joining the engine body and the oil pan, A sealer member having a predetermined thickness is used.

  Conventionally, the timing chain cover and the oil pan have been formed of metal like the engine body. However, in order to reduce the weight of the vehicle, the use of a synthetic resin has been studied. Also, in the joining structure of other metal members and metal members, in order to reduce the weight and cost, one metal member is replaced with a synthetic resin member, and the joining of the metal member and the synthetic resin member is increased. ing.

  However, the sealer member has a high adhesive strength with the metal member, but has a low adhesive strength with the synthetic resin. It was desired to improve. Moreover, since the synthetic resin member needs heat resistance, there was a limit to the material to be used.

  In order to improve the adhesive force of the synthetic resin member, the surface of the synthetic resin is roughened by shot blasting or sandpaper, and the adhesive force is improved by an anchor effect (for example, see Patent Document 1). .) In this case, the resin member and the resin sheet, i.e., the synthetic resin are bonded to each other, the adhesive layer is applied as a thin layer, and a paste-like sealer member having a predetermined thickness is used. Is different.

Further, as shown in FIG. 8, when forming a composite of the synthetic resin member 110 and the metal member 210, a plurality of inclined holes 211 are formed on the surface of the metal member 210 in an oblique direction, and the inclined holes 211 are melted. Some synthetic resin members 110 in a state are allowed to flow to form a composite of the synthetic resin member 110 and the metal member 210 (see, for example, Patent Document 2). In this case, in order to make it difficult for the synthetic resin member to be peeled off, the inclined hole 211 having a different angle is used. In this case, since the synthetic resin is directly allowed to flow into the inclined hole 211, it is difficult to remove the synthetic resin member 110 and the metal member 210 after the formation.
Therefore, it is inappropriate when it is necessary to remove the synthetic resin member 110 and the metal member 210.

JP 2010-58485 A JP 2009-51131 A

  Therefore, an object of the present invention is to provide a joining structure that joins a metal member and a synthetic resin member that improve adhesive strength using a sealer member with simple equipment.

The present invention of claim 1 for solving the above-mentioned problem is a joining structure for joining a metal member and a synthetic resin member.
A number of recesses are formed on the surface of the synthetic resin member, the surface on which the recesses are formed is opposed to the surface of the metal member, a sealer member is attached between the metal member and the synthetic resin member, and the sealer member enters the recess. At the same time, the sealer member has a joint structure for joining the metal member and the synthetic resin member.

  In the present invention of claim 1, a number of recesses are formed on the surface of the synthetic resin member, the surface on which the recesses are formed is opposed to the surface of the metal member, and a sealer member is attached between the metal member and the synthetic resin member The sealer member enters the recess. For this reason, while the contact area of a sealer member and a synthetic resin member becomes large, the adhesive strength of a sealer member and a synthetic resin member can increase according to an anchor effect.

  According to the second aspect of the present invention, the concave portion formed on the surface of the synthetic resin member has a depth of 0.001 to 2 mm and a joint that joins the synthetic resin member with a metal member having a width of 0.005 to 3 mm. Structure.

  According to the second aspect of the present invention, since the recess formed on the surface of the synthetic resin member has a depth of 0.001 to 2 mm and a width of 0.005 to 3 mm, the paste-like sealer member is formed in the recess. It is easy to enter, a sufficient adhesion area with the synthetic resin member can be obtained, and the anchor effect of the sealer member entering the recess can be obtained.

When the depth is less than 0.001 mm, an increase in the adhesion area is reduced, and a sufficient anchor effect cannot be obtained. When the depth exceeds 2 mm, labor for forming the concave portion is increased and a paste-like sealer is formed. It is difficult for the member to enter the bottom of the recess, and the increase in adhesive strength is small.
When the width is less than 0.005 mm, since the opening of the recess is small, it is difficult for the paste-like sealer member to enter the recess, and when the width exceeds 3 mm, the effort for forming the recess increases. The number of recesses is reduced, the contact area is reduced, and the adhesive strength is not improved.

  According to the third aspect of the present invention, the metal member is made of aluminum, iron or stainless steel, the synthetic resin member is made of engineering plastic, and the sealer member is a silicone rubber-based paste metal member and synthetic resin It is the joining structure which joins a member.

In the present invention of claim 3, the metal member is made of aluminum, iron or stainless steel, the synthetic resin member is made of engineering plastic, and the sealer member is a silicone rubber-based paste. Two materials having different physical properties can be firmly joined by the sealer member. Since the metal member is made of aluminum, iron, or stainless steel, the joining force with the sealer member is large, and the weight can be reduced by reducing the weight. Since the synthetic resin member is made of engineering plastic, it can be easily molded and a product excellent in heat resistance, durability, and rigidity can be obtained.
Since the sealer member is in the form of a silicone rubber paste, a product having high adhesive strength and excellent heat resistance and durability can be obtained.

  According to a fourth aspect of the present invention, the metal member is a cylinder block and a cylinder head of an engine, and the synthetic resin member is a joint structure for joining the metal member that is a timing chain cover and the synthetic resin member.

  In the present invention of claim 4, the metal member is an engine cylinder block and a cylinder head, and the synthetic resin member is a timing chain cover. Since the timing chain cover is made of synthetic resin, the engine can be reduced in weight. Since the recess is formed in the timing chain cover, the cylinder block and the cylinder head and the timing chain cover can be firmly bonded by the sealer member, and the sealer member and the timing chain cover are not deteriorated by the heat of the engine.

  According to the fifth aspect of the present invention, the concave portion formed on the surface of the synthetic resin member is formed by shot blasting, laser processing, drilling, or a mold for molding the synthetic resin member. A large number of convex portions are formed on the surface, and the formed large number of convex portions are transferred during molding of the synthetic resin member to form concave portions, or the metal member and synthetic resin member formed by any of them are joined. It is a junction structure.

In the present invention of claim 5, when the concave portion formed on the surface of the synthetic resin member is formed by shot blasting, laser processing, or drilling, the surface of the synthetic resin member is directly shot blasting, laser processing, or drilling processing. The depth and width of the recess can be controlled by adjusting the processing conditions.
When forming a large number of protrusions on the surface of a mold for molding a synthetic resin member and transferring the formed many protrusions during molding of the synthetic resin member to form a recess, the surface of the mold By forming a large number of convex portions, the concave portions can be efficiently formed on a large number of synthetic resin members under the same conditions by injection molding or the like.

  According to a sixth aspect of the present invention, the concave portion formed on the surface of the synthetic resin member is a joint structure for joining the metal member and the synthetic resin member, wherein the bottom portion has a larger area than the opening.

  In the present invention of claim 6, since the concave portion formed on the surface of the synthetic resin member has a larger area at the bottom than the opening, the sealer member that has entered the concave portion is difficult to come out and exhibits a large anchor effect. Thus, the metal member and the synthetic resin member can be strongly bonded.

  The present invention of claim 7 is a joint structure in which the concave portion formed on the surface of the synthetic resin member is formed obliquely with respect to the surface of the synthetic resin member and joins the metal member and the synthetic resin member.

  In this invention of Claim 7, since the recessed part formed in the surface of a synthetic resin member was formed diagonally with respect to the surface of a synthetic resin member, when peeling a synthetic resin member, the sealer member which entered into the recessed part However, unlike the peeling direction, the metal member and the synthetic resin member can be strongly joined by being difficult to come off and exhibiting an anchor effect.

  Since many concave portions are formed on the surface of the synthetic resin member and the sealer member enters the concave portion, the contact area between the sealer member and the synthetic resin member is increased, and the adhesive effect between the sealer member and the synthetic resin member is increased Can be increased.

1 is an exploded perspective view of an automobile engine used in an embodiment of the present invention. It is a side view of the oil pan used in the embodiment of the present invention. It is an expanded sectional view of the joined part of the synthetic resin member and sealer member which are the 1st form of implementation of the present invention. It is an expanded sectional view of the joined part of the synthetic resin member and sealer member which are the 2nd form of implementation of the present invention. It is an expanded sectional view of the joined part of the synthetic resin member and sealer member which are the 3rd form of implementation of this invention. It is an expanded sectional view of the joined part of the synthetic resin member and sealer member which are the 4th form of implementation of the present invention. In embodiment of this invention, it is a graph which shows the joining strength of the sealer member and synthetic resin member of what carried out the surface treatment of the synthetic resin member, and the thing which does not perform the conventional surface treatment. It is an expanded sectional view of the junction part of the conventional synthetic resin member and a metal member.

In the embodiment of the present invention, a sealer member is used to connect a synthetic resin timing chain cover 10 and an oil pan 20 to a die-cast cylinder head cover 2 and cylinder head 3 of an automobile engine 1. For example, a connection structure between a metal member and a synthetic resin member using a sealer member will be described with reference to FIGS.
In addition to the above, the connection structure between the metal member and the synthetic resin member of the present invention can be used when other metal members and the synthetic resin member are joined.

  FIG. 1 is an exploded perspective view of an engine 1 of an automobile. The engine 1 is integrally assembled with a cylinder head cover 2, a cylinder head 3 below it, and a cylinder block 4 below it. Inside the cylinder head 3, an intake cam pulley 7 and an exhaust cam pulley 8 are attached.

A crank pulley 6 is provided in the cylinder block 4, and a timing chain 5 is hung on a gear attached to the tips of the intake cam pulley 7 and the exhaust cam pulley 8 and a gear attached to the tip of the crank pulley 6.
The cylinder head cover 2, the cylinder head 3, and the cylinder block 4 are made of iron (cast iron) aluminum, magnesium, stainless steel, or an alloy containing these.

The timing chain cover 10 is attached so as to cover the cylinder head 3 and the cylinder block 4 to which the timing chain 5 is attached.
As shown in FIG. 1, the timing chain cover 10 has a contact surface 11 so that the outer peripheral surface contacts the outer peripheral portions of the cylinder head 3 and the cylinder block 4. Accordingly, the timing chain 5 can be completely covered and sealed with the timing chain cover 10. As will be described later, the contact surface 11 has a large number of recesses 30 formed on the surface thereof, and is applied with a sealer 12 as a sealer member.

The timing chain cover 10 is formed of a heat resistant synthetic resin. For this reason, the weight of the engine 1 can be reduced, and the engine heat does not deform or deteriorate.
As the heat-resistant synthetic resin, engineering plastics are used. For example, nylon 66, nylon 6, nylon 11, nylon 12, etc., which are polyamide resins, and polypropylene, polyacetal, polycarbonate, etc. can be used. The synthetic resin may be a homopolymer or two or more types of copolymers.

  Inorganic fillers can also be used in polyamide resins and other synthetic resins. As the inorganic filler, for example, fibrous fillers such as glass fibers and carbon fibers, and powder fillers such as talc, mica, calcium carbonate, and silica can be used. When an inorganic filler is used, heat resistance and rigidity can be improved. When a fibrous filler such as glass fiber or carbon fiber is used, impact resistance and elasticity are improved.

The oil pan 20 is attached to the lower surface of the cylinder block 4. The oil pan 20 is formed to be recessed so that oil can be stored, and an abutment surface 21 is formed on the outer peripheral portion so as to abut against the lower surface of the cylinder block 4. Similar to the timing chain cover 10, the contact surface 21 is formed with a recess 30 on the surface, and a sealer 22 is applied thereto.
The oil pan 20 can also use the same heat-resistant synthetic resin as described above, and can use an inorganic filler.

The sealers 12 and 22 which are seal members are made of a paste-like high viscosity silicone rubber material. For the sealers 12 and 22, for example, a gasket called FIPG (Formed In Place Gasket) is used.
The sealers 12 and 22 have viscosity when applied to the timing chain cover 10 and the oil pan 20, and therefore do not drip immediately and can be hardened with elasticity after application. For this reason, the timing chain cover 10 or the oil pan 20 and the cylinder block 4 can be sealed to prevent oil from leaking to the outside.
For the sealers 12 and 22 as the sealer members, for example, a rubber-based material such as butyl rubber, polyurethane, chloroprene rubber, and nitrile rubber can be used in addition to the silicone rubber-based material.

Next, the recessed part 30 formed in the contact surfaces 11 and 12 of the timing chain cover 10 which is a synthetic resin member, and the oil pan 20 is demonstrated. The shape of the recess 30 is shown in FIGS.
First, a first embodiment of the present invention will be described with reference to FIG. 3, the recess 30 has a depth (indicated by A in FIG. 3) of 0.001 to 2 mm, and a width (indicated by B in FIG. 3) of 0.005 to 3 mm.
The sealers 12 and 22 enter the recess 30 to join the timing chain cover 10 and the oil pan 20 to the cylinder block 4 and seal the space therebetween.

  The concave portions 30 formed on the contact surfaces 11 and 12 of the timing chain cover 10 and the oil pan 20 that are synthetic resin members are formed when the contact surfaces 11 and 12 are formed by shot blasting, laser processing, or drilling. The depth and width of the recess can be controlled by adjusting the processing conditions of direct shot blasting, laser processing, and drilling.

When forming a large number of protrusions on the surface of a mold for molding a synthetic resin member and transferring the formed many protrusions during molding of the synthetic resin member to form a recess, the surface of the mold By forming a large number of convex portions on the surface, it is formed by injection molding or the like. In this case, as for many convex parts on the surface of a metal mold | die, many convex parts may be formed in a grid | lattice form, and a convex part may be formed at random.
Once the convex portions are formed in the mold, a large number of synthetic resin members having the same concave portions can be efficiently formed under the same conditions by repeating injection molding.

When the paste-like sealers 12 and 22 enter the recesses 30 formed on the surface of the synthetic resin member, a sufficient adhesion area and anchor effect can be obtained.
If the depth of the concave portion 30 is less than 0.001 mm, the amount of the sealers 12 and 22 entering is small, the adhesive surface area is small, and a sufficient anchor effect cannot be obtained. When the depth of the concave portion 30 exceeds 2 mm, shot blasting described later is performed to form the concave portion 30, but the time for performing the shot blasting is increased and the sealers 12 and 22 are paste-like. Since the viscosity is high, it is difficult to enter the bottom of the recess 30 and it is useless.

  If the width of the concave portion 30 is less than 0.005 mm, the opening of the concave portion 30 is small, so that it is difficult for the paste-like sealer member to enter the concave portion 30. In addition to the increased effort, the anchor effect is reduced, the number of recesses 30 is reduced, the contact area is reduced, and the adhesive strength is not improved.

  The recess 30 in FIG. 3 can be formed by shot blasting. When forming the concave portion by shot blasting, it is performed by spraying an abrasive together with air on the contact surfaces 11 and 12. As the abrasive, for example, a zircon grid (FZG-30, 40) manufactured by Fuji Seisakusho, which is a zircon-based abrasive, was used. The abrasive is composed of crystalline zirconia (ZrO2) and amorphous silicon oxide (SiO2), and the particle size of the abrasive is 0.425 to 0.600 mm for FZG-30 and 0 for FZG-40. .250-0.425 mm.

As abrasives, other than zircon abrasives, for example, iron, stainless steel, alumina, silicon carbide powder, plastic nylon, melamine, polycarbonate, acrylic powder, glass powder, etc. Can be used.
Either direct pressure type or gravity type may be used for spraying.
By adjusting the air pressure and time of spraying, the recess 30 has a depth (indicated by A in FIG. 3) of 0.01 to 0.2 mm and a width (indicated by B in FIG. 3) of 0. What was 0.05-0.3 mm was obtained.

Shot blasting is performed by spraying abrasive onto the contact surface 11 of the timing chain cover 10 and the contact surface 21 of the oil pan 20 which are synthetic resin members.
In the present embodiment, a test piece (width 40 mm, length 60 mm) formed from nylon 66 is coated with an abrasive having a particle size of 0.25 to 0.60 mm of zircon grid for 5 to 10 seconds and an air pressure of 0.3. Shot blasting was performed by spraying ˜0.5 Mpa.
Thereby, a concave portion having a width of 0.07 to 0.11 mm and a depth of 0.02 to 0.05 mm was formed on the surface.

A paste-like high viscosity silicone rubber sealer was applied 10 mm in width between the test piece made of nylon 66 subjected to shot blasting and an aluminum test piece of the same size, and the peel strength was measured. did. The result is shown in FIG.
The peel strength was measured for each of the nylon 66 test piece and the aluminum test piece until they were tensile-ruptured by a tensile tester.

  The test piece was coated with a silicone rubber sealer over the entire surface of the nylon 66 plate of 60 mm x 40 mm, and then pressed slightly with an aluminum test piece of 60 mm x 40 mm in size. And left for 96 hours. And it pulled in the shear direction, the tensile load at the time of a fracture | rupture was measured, and it divided by the area which apply | coated the sealer, and calculated | required the fracture | rupture load.

  As shown in FIG. 7, those subjected to shot blasting have a tensile fracture strength of about 0.5 to 0.7 MPa, and those not subjected to shot blasting have a tensile fracture strength of 0.1 About 0.2 MPa. For this reason, it is clear that the adhesive strength is increased by performing shot blasting.

Next, a second embodiment of the present invention will be described with reference to FIG.
The concave portion 30 of the second embodiment is formed to be inclined obliquely. The depth and width of the recess 30 are the same as those in the first embodiment.
Since the concave portion 30 is formed to be inclined, the sealers 12 and 22 are hardly peeled off, and the anchor effect can be increased.

The direction of the inclination of the recess 30 can be changed depending on the location. In this case, the anchor effect can be further increased.
The recess 30 can be formed at the same time by forming a protrusion for forming the recess 30 on the mold when the timing chain cover 10 or the oil pan 20 is formed by injection molding or the like.
When the direction of the inclination of the recess 30 is changed depending on the location, it is necessary to provide a slide core in the mold.

Next, a third embodiment of the present invention will be described with reference to FIG.
The recess 30 according to the third embodiment has a spherical shape at the bottom and a larger area than the opening. For this reason, the sealers 12 and 22 that have entered the recess 30 are unlikely to come out of the recess 30, and the anchor effect can be increased.

  The recess 30 of the third embodiment can be formed by laser processing. The contact surfaces 11 and 12 of the timing chain cover 10 and the oil pan 20 are spot-irradiated many times to form the recesses 30. A spherical portion can be formed at the bottom of the recess 30 by adjusting the laser beam.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
The concave portion 30 of the fourth embodiment has a bottom that spreads out in a triangular shape and has a larger area than the opening. For this reason, the concave part having a triangular cross section at the bottom may extend continuously in the lateral direction in a band shape, and a large number of the belt-like concave parts may be arranged in parallel. Further, a large number of the strip-shaped recesses may be arranged in parallel in the vertical direction.
The sealers 12 and 22 that have entered the recess 30 are unlikely to come out of the recess 30, and the anchor effect can be increased.

  The concave portion 30 of the third embodiment can be formed by laser processing or drilling. A recess 30 is formed by applying a drill to the contact surfaces 11 and 12 of the timing chain cover 10 and the oil pan 20. By moving the drill blade, a triangular portion can be formed at the bottom of the recess 30.

DESCRIPTION OF SYMBOLS 1 Engine 2 Cylinder head cover 3 Cylinder head 4 Cylinder block 10 Timing chain cover 11, 21 Contact surface 12, 22 Sealer 20 Oil pan 30 Recessed part

Claims (7)

In the joining structure that joins the metal member and the synthetic resin member,
A number of recesses are formed on the surface of the synthetic resin member, the surface on which the recesses are formed is opposed to the surface of the metal member, a sealer member is pasted between the metal member and the synthetic resin member, and the sealer member The joint structure in which the sealer member joins the metal member and the synthetic resin member while entering the recess.   The joint structure for joining a metal member and a synthetic resin member according to claim 1, wherein the recess formed on the surface of the synthetic resin member has a depth of 0.001 to 2 mm and a width of 0.005 to 3 mm. .   The metal member is made of aluminum, iron, or stainless steel, the synthetic resin member is made of engineering plastic, and the sealer member is a silicone rubber-based paste. A joining structure that joins a metal member and a synthetic resin member.   The joining structure for joining the metal member and the synthetic resin member according to any one of claims 1 to 3, wherein the metal member is a cylinder block and a cylinder head of an engine, and the synthetic resin member is a timing chain cover.   The concave portion formed on the surface of the synthetic resin member is formed by shot blasting, laser processing, drilling or the like on the surface of the mold for molding the synthetic resin member. 5, and forming the concave portions by transferring the formed convex portions at the time of molding the synthetic resin member, or forming the concave portions, according to any one of claims 1 to 4. A joining structure that joins a metal member and a synthetic resin member.   The joining structure for joining the metal member and the synthetic resin member according to any one of claims 1 to 5, wherein the concave portion formed on the surface of the synthetic resin member has a larger area at the bottom than at the opening.   The joint formed by joining the metal member and the synthetic resin member according to any one of claims 1 to 6, wherein the concave portion formed on the surface of the synthetic resin member is formed obliquely with respect to the surface of the synthetic resin member. Construction.

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