JP4450181B2 - Carburetor joint - Google Patents

Description

  The present invention relates to a carburetor joint that connects an intake portion (intake manifold) of a cylinder head and a carburetor (vaporizer) in a gasoline engine mounted on, for example, a motorcycle.

This type of carburetor joint includes a composite structure in which a rubber cylindrical member is vulcanized and bonded to a resin annular member in order to make it difficult to transmit engine vibration and heat to the carburetor (for example, patents). Reference 1). In this carburetor joint, the resin-made annular member may be warped or warped due to molding. In order to attach the annular member to the intake portion of the engine, when the two attachment pieces of the annular member are tightened with screws or the like, the annular member is fitted into the annular groove on the outer end surface (end surface on the intake portion side) of the annular member. The reaction force accompanying crushing the O-ring may cause a part of the annular member to be bent so as to float from the joint surface of the intake portion. Stress is concentrated around the hole for screw insertion of the mounting piece due to the correction of the molding distortion of the annular member that has caused the molding distortion and the reaction force that accompanies crushing the O-ring. For this reason, the durability of the mounting piece is likely to be broken and the durability is reduced, and the crushing margin of the O-ring may be insufficient at a predetermined position in the circumferential direction, which may reduce the sealing performance.
JP 61-142357 A

  The present invention relates to a composite carburetor joint in which a rubber cylindrical member is bonded to a resin annular member, and improves the molding accuracy of the annular member and prevents bending when the attachment piece is attached with a screw or the like. Improvement of sealing performance and sealing performance is a problem to be solved.

The present invention relates to a carburetor joint which connects the inlet portion and the carburetor of the engine, the resin annular member that is connected to the intake section, vulcanized adhesive rubber tubular member in which the carburetor is connected and having a composite structure constitutes a vent for venting the air intake and the carburetor by the inner peripheral surfaces of both members were the adhesive, said annular member and having a mounting piece on the outer periphery of the annular member Reinforcing ribs are provided on the inner end face (end face on the carburetor side) around the ventilation hole and on the attachment piece, and the attachment piece is provided at two positions opposite to each other at 180 degrees across the center of the ventilation hole. The rib has a ring-shaped portion surrounding the periphery of the air hole and an extension portion extending to each attachment piece .

  It is preferable that the annular member has an annular groove around the vent hole on the outer end surface (end surface on the intake portion side), and an O-ring is fitted into the annular groove.

  According to the present invention, since the strength of the annular member itself is improved by providing the reinforcing rib on the annular member, distortion such as warpage and bending is less likely to occur when the annular member is molded.

  If it is a carburetor joint provided with such an annular member, it is not necessary to correct the molding distortion of the annular member at the time of attachment to the engine. Can be prevented. Moreover, even when the O-ring is attached to the annular member, the crushing allowance of the O-ring can be made substantially equal in the circumferential direction, and the annular member partially floats from the joint surface of the intake portion due to the reaction force of the crushing allowance of the O-ring. This can be suppressed or prevented. As a result, the sealing performance is improved as compared with the conventional example, so that the introduction efficiency of the air-fuel mixture to the engine is improved, and stress concentration around the fastening portion such as a screw in the mounting piece can be reduced, so that the annular member is cracked. The durability of the carburetor joint is improved compared to the conventional example.

  The carburetor joint of the present invention has improved durability and sealability.

  Hereinafter, the present invention will be described based on the best embodiment shown in the drawings. 1 is a cross-sectional view showing a carburetor joint in use, FIG. 2 is a perspective view showing the carburetor joint, FIG. 3 is a perspective view showing an annular member of the carburetor joint, and FIGS. 4 and 5 are annular views of FIG. It is the perspective view which looked at the member from the opposite direction.

  As shown in FIG. 1, a carburetor joint 3 is used to connect an intake portion (intake manifold) 1 and a carburetor 2 of a cylinder head of a gasoline engine.

  The carburetor joint 3 has a composite structure in which a rubber cylindrical member 5 is vulcanized and bonded to a resin annular member 4. The annular member 4 is connected to the intake portion 1, and the carburetor 2 is connected to the tubular member 5, whereby the carburetor 2 is connected to the intake portion 1. A connection portion between the annular member 4 and the intake portion 1 is sealed with an O-ring 6.

  The annular member 4 has attachment pieces 41 that project outward in the radial direction at predetermined positions (two locations) on the outer periphery thereof. The attachment pieces 41 are provided at two positions 180 degrees opposite to each other with the center of the vent hole 42 interposed therebetween. Each attachment piece 41 has a metal collar 7 for screw insertion embedded therein by insert molding. Yes. A screw 8 is used to connect the carburetor joint 3 to the intake section 1.

  An annular groove 44 into which the O-ring 6 is fitted is provided around the vent hole 42 on the outer end surface 43 (end surface on the intake portion 1 side) of the annular member 4. The depth of the annular groove 44 is set to be smaller than the wire diameter of the O-ring 6 in the natural state, but the difference is appropriately set based on the crushing allowance of the O-ring 6 in consideration of necessary sealing performance. Further, the width of the annular groove 44 is set larger than the wire diameter of the natural O-ring 6 in order to allow the expansion accompanying the crushing of the O-ring 6, so that the O-ring 6 is simply inserted into the annular groove 44. The O-ring 6 will come out only by doing. In order to prevent the O-ring 6 from slipping out, convex-shaped stoppers 48 that narrow the groove width are provided at a plurality of locations in the circumferential direction of the annular groove 44.

  Since the reinforcing rib 47 is provided on the inner end face (end face on the carburetor 2 side) 46 of the annular member 4 of the carburetor joint 3 in order to increase the strength, it will be described in detail below.

  Specifically, the reinforcing rib 47 has a ring-shaped portion 47a provided around the vent hole 42 on the inner end surface 46 of the mounting piece 41, and an extension 47b extending from the ring-shaped portion 47a to the vicinity of the collar 7 of the mounting piece 41. is doing. The extension 47b is provided so as not to interfere with a molding die used when the annular member 4 and the tubular member 5 are vulcanized and bonded. However, although not shown, when the projecting dimension of the mounting piece 41 can be increased so as to ensure a contact surface with the molding die, the extension 47b of the reinforcing rib 47 is surrounded by the periphery of the hole of the collar 7. It can be further extended.

  The annular member 4 is a thermosetting resin such as a phenol resin. The cylindrical member 5 is made of, for example, nitrile rubber (NBR), synthetic rubber with improved ozone resistance of nitrile rubber (NBR), or the like. The O-ring 6 is selected from nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), fluorine rubber (FKM), or the like as necessary. The collar 7 is a steel material or the like. These materials are merely examples, and other appropriate materials can be used.

  By providing the reinforcing rib 47 on the annular member 4 in this way, the strength of the annular member 4 itself can be improved, so that molding distortion such as warpage and deflection is less likely to occur when the annular member 4 is molded.

  With the carburetor joint 3 having such an annular member 4, it is not necessary to correct the molding distortion of the annular member 4 when attached to the engine intake portion 1, so stress concentrates around the collar 7 in the attachment piece 41. This can be suppressed or prevented. In addition, when the carburetor joint 3 is connected to the intake portion 1 with the O-ring 6 being crushed by inserting the screw 8 through the hole of the collar 7 and screwing the screw 8 into the screw hole 1a of the intake portion 1 of the engine, The crushing allowance of the O-ring 6 can be made substantially uniform in the circumferential direction, and the annular member 4 can be suppressed or prevented from partially floating from the joint surface of the intake portion 1 due to the reaction force of the crushing allowance of the O-ring 6. Thereby, since the sealing performance is improved as compared with the conventional example, the introduction efficiency of the air-fuel mixture into the engine is improved, and stress concentration around the collar 7 in the mounting piece 41 can be reduced, so that the annular member 4 is cracked, etc. The durability of the carburetor joint 3 is improved as compared with the conventional example.

  In addition, the extension part 47b in the reinforcing rib 47 of the annular member 4 can be enlarged in a triangular shape as shown in FIG. In addition to motorcycles, the carburetor joint 3 of the present invention can be used for all vehicles equipped with a gasoline engine using the carburetor 2.

Sectional drawing which shows the use condition of the carburetor joint which concerns on the best form of this invention The perspective view which shows the carburetor joint shown in FIG. The perspective view which shows the annular member of the carburetor joint shown in FIG. The perspective view which looked at the annular member of Drawing 3 from the opposite direction The figure corresponding to FIG. 4 with the annular member of the carburetor joint which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Engine intake part 2 ... Carburetor 3 ... Carburetor joint 4 ... Annular member 5 ... Cylindrical member 6 ... O-ring 7 ... Collar 8 ... Screw 41 ... Annular member attachment piece 42 ... Annular member ventilation hole 43 ... Annular member The outer end surface 44 of the annular member 46 The inner end surface of the annular member 47 The reinforcing rib 47a of the annular member 47a The annular portion 47b of the reinforcing rib The extended portion of the reinforcing rib

Claims (1)

A carburetor joint that connects the engine intake and the carburetor,
A resin annular member that is connected to the intake section, a rubber tubular member in which the carburetor is connected pressurized and vulcanized adhesion, venting the intake section and the carburetor by the inner peripheral surfaces of both members were the adhesive It has a composite structure that configures ventilation holes,
It said annular member and having a mounting piece on its outer circumference, the inner end surface of the annular member (end surface of the carburetor side) provided reinforcing ribs around and the mounting piece of the vent hole, the mounting piece is above the vent hole A carburetor joint , which is provided at two positions opposed to each other at 180 degrees across the center of the ridge, and wherein the reinforcing rib has a ring-shaped portion surrounding the periphery of the vent hole and an extending portion extending to each attachment piece .

Images