JPH04331894A - Connection structure for hose - Google Patents

Abstract

PURPOSE:To enhance the sealability of a connection structure between a hose and a pipe by preventing the inner peripheral surface of the hose from bring damaged. CONSTITUTION:In the connection structure between a hose 1 and a pipe 4 comprising a cylindrical base part 2 and a check bead 3 projected from the outer peripheral surface of the base part 2, by which the hose 1 fitted onto the pipe 4 and the check bead 3 is made into press-contact with the inner peripheral surface of the hose 1, the check bead 3 is made of a material which is softer than that of the base part 2, and is molded by a two-color molding process, being integrally incorporated with the base part 2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose connection structure that improves sealing performance at a joint surface when connecting a hose to a pipe.

0002

[Prior Art] Conventionally, in a hose connection structure, in order to maintain the sealing properties of the joint surface between the pipe and the hose, the pipe and the hose were bonded together using an adhesive, or a sealant was applied to the joint surface. Or, they are connected with an O-ring interposed. However, when joining pipes by applying adhesive or sealant to the joint surface, voids occur in the adhesive or sealant coating film when connecting the hose, making it difficult to adhere or seal the entire joint surface. is often the case. Therefore, it is necessary to heat-age the coating film before connection. In addition, when connecting a pipe and a hose with an O-ring intervening, the O-ring attached to the pipe may come off or shift when connecting the hose, and the joint surface with the hose may not provide sufficient sealing performance. It may be difficult to do so.

[0003] Furthermore, in the connection structure between a rubber hose and a hard pipe, in order to improve the sealing performance, the outer peripheral surface of the joint is tightened with caulking or a metal band to improve the sealing performance and lock the joint. It is easy to apply excessive force to the hose, which may cause damage to the inner circumferential surface of the hose.

0004

[Problems to be Solved by the Invention] The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a hose that prevents damage to the inner peripheral surface of the hose and further improves sealing performance in a connection structure between a hose and a pipe. The purpose is to create a connection structure.

[0005]

[Means for Solving the Problems] The hose connection structure of the present invention includes a hose, a pipe including a cylindrical base and a retaining protrusion protruding from the outer circumferential surface of the base. In a hose connection structure in which the pipe is inserted and the retaining protrusion is pressed against the inner peripheral surface of the hose, the retaining protrusion is made of a softer material than the base and is integrated with the base by two-color molding. It is characterized by being formed.

[0006] The hose connection structure of the present invention includes a hose,
It consists of a pipe. The hose is not particularly limited and may be a normal rubber hose or resin hose. The pipe has a cylindrical base and a retaining protrusion that protrudes from the outer peripheral surface of the base that contacts the hose and is integrally formed by two-color molding from a material softer than the base.

The base is cylindrical and has an outer diameter that is approximately the same as or slightly smaller than the inner diameter of the hose, and is made of a common resin such as 6-6 nylon or 6-nylon. In order to make it harder than the retaining protrusion, it may be formed of a resin containing an inorganic filler, glass fiber, or the like. For example, the base portion may be formed of 6-6 nylon containing glass fiber, and the retaining protrusion may be formed by two-color molding of 6-6 nylon containing no glass fiber.

[0008] The retaining protrusion is made of a material that is softer than the base and is made of a resin that does not contain inorganic fillers, a resin modified by adding a softening additive, a soft resin, or an elastic body such as rubber. Can be done. In other words, the retaining protrusion is made of a softer material and is formed to protrude from the base, thereby improving the sealing performance of the joint surface. This retaining protrusion is formed by two-color molding on the outer peripheral surface of the base to prevent it from being fixed and coming off or shifting. Furthermore, by forming the retaining protrusion from the same material as the base or a material with good compatibility, it can be more firmly fixed to the base.

Preferably, the retaining protrusions are formed in a ring shape in the circumferential direction of the base, and a plurality of protrusions are formed in the axial direction. If the shape of the retaining protrusion is, for example, serrated in cross section, the hose can be easily inserted and difficult to come off. Furthermore, other shapes such as a mountain shape or a spherical shape can also be used. The ring shape does not have to be continuous around the entire circumference of the base, and may be a partial protrusion.

[0010] Since this retaining protrusion is formed integrally with the pipe, it will not come off when connected to the hose.
It does not shift, and since it is made of a soft material and is pressed against the inner peripheral surface of the hose, the sealing performance at the joint surface is improved.

[0011]

[Operation] The hose connection structure of the present invention consists of a hose and a pipe consisting of a cylindrical base and a retaining projection protruding from the outer peripheral surface of the base, and the pipe is inserted into the hose and a soft retainer is provided. The protrusion is pressed against the inner peripheral surface of the hose. For this reason, unlike the conventional case where an O-ring is joined through the joint surface, the retaining protrusion is softer than the base and is integrally formed with the base by two-color molding, so it does not come off when the hose is inserted. , it will not shift. In addition, since it is made of a soft material, it can be pressed against the joint surface and maintain sealing performance. Furthermore, it is possible to prevent the inner peripheral surface of the hose from being damaged by the pipe.

0012

[Examples] Hereinafter, the present invention will be explained in detail using examples. Figure 1
shows a partial sectional view of the main parts of the connection structure of this hose. The connection structure of this hose consists of a hose 1, a cylindrical base 2, and a ring-shaped protrusion on the outer circumferential surface of the base 2 with a serrated cross section, and a loop in which the peaks become higher inward from the end of the base material 2. A pipe 4 in which three rows of stopper protrusions 3 are formed at equal intervals in the axial direction.
It consists of

The hose 1 is made of rubber and has an inner diameter that is approximately the same as the outer diameter of the pipe. The base 2 constituting the pipe 4 is cylindrical and made of 6-6 nylon containing 30% by weight glass fiber. The retaining protrusion 3 has a modified 6 which is softer than the base 2.
It is made of -6 nylon and is integrally formed with the base 2 by two-color molding. Therefore, the soft protrusion 3 is fused to the base 2 and is strongly integrated.

To connect this hose, the rubber hose 1 is inserted into the pipe 4 to a predetermined position. At this time, the soft protrusion 3 has a truncated conical shape and has a larger outer diameter than the insertion side of the hose 1, so the hose 1 can be easily inserted, pressed against it, and prevented from coming off, and the connection has improved sealing performance. It becomes a structure. FIG. 2 is a partial sectional view showing a state in which the pipe 4 has three ports and hoses 1 are connected to each pipe. Each of the pipes 4 has ring-shaped retaining protrusions 3 formed at equal intervals, and is pressed against the hose 1 to form a joint surface. This prevents it from coming off and improves sealing performance. It is also possible to caulk with a metal band from the outer peripheral side of the joint surface. in this case,
The presence of the soft protrusion prevents damage to the inner surface of the hose 1 due to contact between the hard pipe and the hose.

Further, as shown in FIG. 3, a groove with a ring-shaped cross section is provided in the base 2, and a compatible soft resin is embedded in the groove to form a retaining protrusion 3 that is firmly integrated. Good too.

[0016]

According to the hose connection structure of the present invention, the retaining protrusion made of a soft material is integrally formed on the outer peripheral surface of the pipe by two-color molding when the base is molded. Therefore, the retaining protrusion is firmly fixed to the base, and will not come off or shift when connected to a hose, unlike conventional O-rings. In addition, since the retaining protrusion is made of a softer material than the base, it can be pressed against the hose to improve the sealing performance of the joint surface. It can also prevent it from coming off.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of the main parts of the hose connection structure of the present embodiment.

FIG. 2 is a partial sectional view of a main part of another hose connection structure of this embodiment.

FIG. 3 is a sectional view of a main part of another pipe structure of this embodiment.

[Explanation of symbols]

1 hose, 2 base, 3 retaining protrusion, 4 pipe,

Claims (1)

[Claims] 1. A hose comprising a hose and a pipe comprising a cylindrical base and a retaining protrusion protruding from the outer circumferential surface of the base, the pipe being inserted into the hose and the retaining protrusion being inserted into the hose. In the hose connection structure which is pressed against the inner peripheral surface of the hose, the retaining protrusion is made of a softer material than the base and is integrally formed with the base by two-color molding. connection structure.