JP2597657Y2 - Intake pipe device made of synthetic resin - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake pipe system for distributing air introduced through a throttle body to respective cylinders of an engine. It relates to a pipe device.

[0002]

2. Description of the Related Art An intake pipe device made of synthetic resin is designed to reduce the weight of the device due to the difference in specific gravity of the material, to reduce the intake air temperature due to the heat insulating effect of the synthetic resin, to improve the engine output by reducing the roughness of the port inner surface, and to improve the design. Adopted from the viewpoint of freedom. An intake pipe device using a synthetic resin material is generally manufactured by a lost core method, a division method, a blow molding method, and a rotating core method. The lost core method is a method in which a resin is injected between a mold and a molten core for molding, and after molding, the core is melted and taken out of the mold to produce the core. The dividing method is a method in which the intake pipe device is divided into a plurality of parts, each part is formed, and the parts are integrated later. The blow molding method is a method in which a hollow parison is extruded and a hollow portion is formed by sandwiching the parison with a mold, and thereafter, a flange or the like is injection-molded. The rotary core method is a method in which a curved surface of a molded article is formed with a certain radius, and the core is rotated and pulled out after injection molding.

[0003]

SUMMARY OF THE INVENTION The intake pipe device made of synthetic resin according to the present invention pays particular attention to the division method among the above-mentioned production methods. In such a dividing method, the divided members are integrated to form an intake pipe device, and this integration is generally performed by screwing with a screw, vibration welding, or applying an adhesive. . According to this screw tightening, the portion corresponding to the female screw needs to be made of a metal material such as a nut or a bush, and screws and female screws are formed by the metal material. And the number of man-hours for screw tightening increases, which is not preferable. When a female screw is formed directly on a member made of a resin material, a change in temperature may cause wrinkling of screws. Also, according to the method of joining by vibration welding, there is a risk that burrs may be generated at the welded portion, and when this burr is generated inside the intake pipe, it is extremely difficult to remove the burr and the intake resistance increases and the engine This has an adverse effect on output characteristics.
In addition, when an adhesive is used, the work must be performed while paying attention to the fact that the adhesive protrudes to a portion other than the joint, and the number of work steps is increased, which is not preferable. After dripping, dripping must be completely deterred.

[0004] The intake pipe device according to the present invention has been made in view of the above-mentioned problems. In an intake pipe device formed by a division method, a new part or a new member is prepared for joining a plurality of members. SUMMARY OF THE INVENTION An object of the present invention is to provide a synthetic resin intake pipe device which is extremely simple and can securely join both members.

[0005]

According to the intake pipe device made of synthetic resin according to the present invention, the above-mentioned problems are caused by a surge tank section connected to the throttle body, an intake pipe section connected to each cylinder of the engine, and a surge tank section. And a connection pipe section for connecting each intake pipe section, and each section is formed of a plurality of divided members made of a synthetic resin material, and is formed of a synthetic resin formed by combining the respective members. In the intake pipe device, the intake device includes an intake pipe member, a lower connection pipe member, and an upper connection pipe member, wherein the intake pipe member has an upper joint flat surface and a lower joint flat surface, and has a lower end. A first connecting pipe portion having an opening in the lower joining flat surface and an upper end opening in the upper joining flat surface, and an intake pipe having an upper end opening in the upper joining flat surface and a lower end opening in a flange portion mounted on the engine. Department and On the upper joint flat surface, outside the opening of the first connection pipe portion, outside the opening of the intake pipe portion, and on the lower connection flat surface, outside the opening of the first connection pipe portion, and the surge tank recess. And a plurality of coupling projections formed by projecting to the outside of the lower connection pipe portion,
An upper joint flat surface joined to a lower joint flat surface of the intake pipe member, and an upper joint flat surface, one end of which is open to a surge tank recess of the intake pipe member, and the other end joined to a lower joint of the intake pipe member. A second connecting pipe portion connected to the first connecting pipe portion that opens on the flat surface, and an insertion hole into which a coupling protrusion protruding from a lower joining flat surface of the intake pipe member can be inserted; A lower joint flat surface joined to the upper joint flat surface of the intake pipe member, and a lower joint flat surface, one end of which is open to the first connection pipe portion that opens to the upper joint flat surface of the intake pipe member; A third connection pipe portion whose other end is open to the upper joint flat surface of the intake pipe member, and an insertion hole into which an engagement protrusion protruding from the upper joint flat surface of the intake pipe member can be inserted; The lower connecting flat surface of the upper connecting pipe member, which is provided on the upper connecting flat surface of the intake pipe member, is inserted. The connecting projections inserted and arranged in the inside are joined by heat caulking, and the upper joint flat surface of the lower connection pipe member arranged on the lower joint flat surface of the intake pipe member is inserted and arranged in the insertion hole. The connecting projections are connected by heat caulking.

[0006]

The intake pipe member and the upper connection pipe member are connected by inserting the connection projection of the upper flat connection surface of the intake pipe member into the insertion hole of the lower connection flat surface of the upper connection pipe member. Are combined by being done. In addition, the intake pipe member and the lower connection pipe member are inserted into the insertion hole of the upper connection flat surface of the lower connection pipe member, with the coupling projection of the lower joining flat surface of the intake pipe member being inserted.
The connection protrusions are connected by heat caulking.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a synthetic resin intake pipe according to an embodiment of the present invention; In this embodiment, the intake pipe device is divided into three members, but the number is not limited. The intake pipe device M includes an intake pipe member M1, a lower connection pipe member M2, and an upper connection pipe member M3, each of which is divided.

[0008] The intake pipe member M1 has an upper joint flat surface 1 which is formed in an upper position and is formed in a flat shape, and a lower joint flat surface 2 which is formed in a lower position and is formed in a flat shape.
A surge tank recess 4 having a bottom 3 is opened inside the lower joint flat surface 2. An intake passage 5 is opened in the surge tank recess 4, and the intake passage 5 is connected to a throttle body (not shown), and air controlled by the throttle body flows into the intake passage 5. On the right side of the surge tank recess 4, a first connection pipe portion 6 having a lower end opening in the lower joining flat surface 2 and an upper end opening in the upper joining flat surface 1 is formed. On the other hand, there is provided an intake pipe portion 8 having an upper end opening to the upper joint flat surface 1 and a lower end opening to a flange portion 7 mounted on the engine. When used as an intake pipe device of an electronic fuel injection device, a fuel injection valve J is attached to this intake pipe portion 8 so as to open. The upper joint flat surface 1 has a plurality of connecting projections 9 protruding upward outside the opening of the first connection pipe 6 and outside the opening of the intake pipe 8. On the other hand, a plurality of connecting projections 9 protrude downward on the outer side of the first joint pipe 6 and on the outer side of the surge tank recess 4 on the lower joint flat surface 2.

An upper joint flat surface 10 is located at a position above the upper connecting pipe member M2 and is joined to the lower joint flat surface 2 of the intake pipe member M1. Is provided in the surge tank concave portion 4 of the intake pipe member M1, and a second connection pipe section 12 is provided which is connected to the first connection pipe section 6 whose other end is opened in the lower joint flat surface 2 of the intake pipe member M1. Reference numeral 13 denotes a closing wall for closing the opening of the surge tank recess 4. The upper joint flat surface 10 is provided with an insertion hole 14 corresponding to the coupling projection 9 of the intake pipe member M1 and through which the coupling projection 9 can be inserted.

Next, the upper connection pipe member M3 will be described. Reference numeral 15 denotes a lower joint flat surface joined to the upper joint flat surface 1 of the intake pipe member M1, and the upper connection pipe member M3
Has one end open to the first connection pipe part 6 opening to the upper joint flat surface 1 of the intake pipe member M1, and the other end to the intake pipe member M1.
A third connection pipe portion 17 is formed to open to the suction pipe portion 8 which opens to the upper flat surface 1 of the upper joint 1. In addition, an insertion hole 14 corresponding to the coupling projection 9 of the intake pipe member M1 and through which the coupling projection 9 can be inserted is formed in the lower joint flat surface 15. In addition, the coupling projection 9 provided on each of the flat joining surfaces 1 and 2 and the insertion hole 1 provided on the flat joining surfaces 10 and 15 are provided.
Reference numerals 4 denote a plurality of pipes provided at appropriate intervals as desired. The intake pipe section 8 and the first connection pipe section 6 in the intake pipe member M1, the second connection pipe section 12 in the lower connection pipe member M2, Third connection pipe part 17 in connection pipe member M3
Are provided according to the number of cylinders of the engine. Each of the members M1, M2, M3 is prepared by injection molding with a synthetic resin material having thermoplasticity.

The assembly of the above members will be described.
The respective connecting projections that contact the lower connecting flat surface 15 of the upper connecting pipe member M3 on the upper connecting flat surface 1 of the intake pipe member M1 and protrude upward from the upper connecting flat surface 1 of the intake pipe member M1. 9 are inserted into the respective insertion holes 14 of the upper connection pipe member M3, and the upper end 9A of the coupling projection 9 is arranged so as to protrude above the upper end surface 15A of the lower joint flat surface 15.

Next, the lower joint flat surface 2 of the intake pipe member M1
The upper connecting flat surface 10 of the lower connecting pipe member M2 is brought into contact with the lower connecting pipe member M2, and the respective connecting projections 9 protruding downward from the lower connecting flat surface 2 of the intake pipe member M1 are inserted into the respective lower connecting pipe members M2. The lower end 9B of the upper joint flat surface 10 is inserted into the hole 14 and
A is arranged to protrude below A.

Next, the upper end 9A of the coupling projection 9 projecting from the upper end surface 15A of the lower connection flat surface 15 of the upper connection pipe member M3.
Is thermally caulked toward the upper end surface 15A of the lower connection flat surface 15. The heat caulking is performed by heating and melting the upper end 9A of the coupling protrusion 9 formed of a thermoplastic synthetic resin material (for example, polyamide), thereby solidifying the upper end surface 15A of the lower connection flat surface 15 while expanding its diameter. It is a thing. On the other hand, the upper connection flat surface 10 of the lower connection pipe member M2
The lower end 9B of the coupling projection 9 protruding from the lower end face 10A of the upper connection flat face 10 is thermally caulked toward the lower end face 10A of the upper connection flat face 10. According to the above, the upper joint flat surface 1 of the intake pipe member M1
The intake pipe member M1 and the upper connection pipe member M3 are fixedly joined in a state where the lower connection flat surface 15 of the upper connection pipe member M3 and the upper connection pipe member M3 are in contact with each other, and the lower connection flat surface 2 of the intake pipe member M1 is connected downward. The intake pipe member M1 and the lower connection pipe member M2 are fixedly joined in a state where the upper joining flat surface 10 of the pipe member M3 is in contact with the upper joining flat surface 10.

The assembling of the intake pipe device is completed by joining the above members. The surge tank is formed by closing the surge tank recess 4 with the closing wall 13, and is limited by the throttle body. When the air flows into the surge tank through the intake path 5,
This air is supplied to the second connection pipe section 12, the first connection pipe section 6,
The gas is supplied to the cylinder of the engine connected thereto via the connection pipe section 15 and the intake pipe section 8.

[0015]

According to the intake pipe device made of synthetic resin according to the present invention, the following effects can be obtained. Assembling is performed by inserting the coupling projections provided above and below the intake pipe member into the insertion holes formed in the lower connection pipe member and the upper connection pipe member, and then inserting the projection of the engagement projection. Since it is performed by heat caulking, the assembling work can be performed extremely easily. At this time, since the connecting projection and the insertion hole are arranged outside the first connecting pipe, the second connecting pipe, the third connecting pipe, and the intake pipe, burrs and the like at the time of connection are reduced. Does not protrude inward, and does not impede any resistance to the intake air flowing through the pipe. It does not require members made of a metal material such as screws, nuts, bushes, etc. for assembly, so that it is possible to maintain the weight reduction by the synthetic resin material and to suppress the increase in manufacturing cost due to the increase in the number of parts. A member for assembling, an insertion hole, and a coupling projection can be formed simultaneously when molding each member.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a synthetic resin intake pipe device according to the present invention.

[Explanation of symbols]

 M1 Intake pipe member M2 Lower connection pipe member M3 Upper connection pipe member 1 Upper joint flat surface 2 Lower joint flat surface 9 Joining protrusion 9A Upper end of joint protrusion 10 Upper joint flat surface 10A Lower end surface of upper joint flat surface 14 Insertion Hole 15 Lower joint flat surface 15A Upper end surface of lower joint flat surface

Claims (1)

(57) [Scope of request for utility model registration] 1. A surge tank connected to a throttle body, an intake pipe connected to each cylinder of an engine, and a connection pipe connecting the surge tank to each intake pipe. In a synthetic resin intake pipe device formed by a plurality of divided members made of a material and formed by joining the respective members, an intake device M includes an intake pipe member M1, a lower connection pipe member M2, ,
The intake pipe member M1 includes an upper joint flat surface 1 and a lower joint flat surface 2, and a lower end is open to the lower joint flat surface 2 and an upper end is an upper joint flat surface. A first connecting pipe portion 6 opening on the surface 1, an upper end opening on the upper joint flat surface 1, and a lower end opening on the flange portion 7 mounted on the engine, and an upper joining flat surface 1 are provided. Outside the opening of the first connection pipe 6 and the suction pipe 8
A plurality of connecting projections formed on the lower joint flat surface 2 on the outer side of the opening of the first connecting pipe 6 and on the outer side of the surge tank recess 4 respectively. 9, the lower connection pipe portion M2 has an upper joint flat surface 10 joined to the lower joint flat surface 2 of the intake pipe member M1 and an upper joint flat surface 10 with one end of the intake pipe member M1. A second connecting pipe portion 6 opening to the surge tank recess 4 and having the other end connected to the first connecting pipe portion 6 opening to the lower joint flat surface 2 of the intake pipe member M1.
A connection pipe portion, and an insertion hole into which a coupling protrusion protruding from the lower joint flat surface of the intake pipe member can be inserted;
The upper connecting pipe member M3 has a lower joining flat face 15 and a lower joining flat face 10 which are joined to the upper joining flat face 1 of the intake pipe member M1, and one end thereof has an upper joining flat face of the intake pipe member M1. A third connecting pipe portion 17 that opens to the first connecting pipe portion 6 that opens to the first and a third connecting pipe portion 17 that opens at the other end to the upper joining flat surface 1 of the intake pipe member M1; Insertion hole 1 into which engaging projection 9 projecting from upper joint flat surface 1 can be inserted.
4 and the lower joint flat surface 15 of the upper connecting pipe member M3 arranged on the upper joint flat surface 1 of the intake pipe member M1.
The connecting projections 9 inserted into the insertion holes 14 are thermally caulked and connected, and the upper connecting flat surface 10 of the lower connecting pipe member M2 disposed on the lower connecting flat surface 2 of the intake pipe member M1 is connected. An intake pipe device made of a synthetic resin, wherein the coupling projections 9 inserted and arranged in the insertion holes 14 are coupled by heat caulking.