JPH08326975A - Hose - Google Patents

Abstract

PURPOSE: To improve the pull-out strength after the assembling with a mate member by engaging a recess and a projection, by forming a recess engaged with a projection formed on the outer peripheral surface of the mate member, to the inner peripheral surface of the end where the mate member is inserted. CONSTITUTION: Near the end face of the end of a rubber hose 1 having a reinforcement thread layer, a single through hole 10 penetrating the inner peripheral surface and the outer peripheral surface is formed, while a ring form projection 20 whose outer diameter is made the larger as going to the rear side is formed at the front end, and a single projection 21 with the triangular section whose height is made the higher as going to the rear side is formed on the outer peripheral surface at the rear side of the projection 20, to a pipe 2 to be a mate member. And a frame 22 is formed at the rear side of the projection 21. When the hose 1 is inserted to the pipe 2, the diameter of the hose 1 is expanded by the projection 20, and the projection 21 is engaged with the through hole 10 at the position where the tip of the hose 1 is abutted to the frame 22, so as to regulate the relative movement in the longitudinal direction, and the relative movement in the circumferential direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose used at a relatively low pressure, such as a water hose for an automobile.

[0002]

2. Description of the Related Art A rubber water hose 100 used to circulate cooling water for an automobile engine is shown in FIG.
Both ends are inserted into the pipe 200 protruding from the cylinder block and the radiator as shown in FIG. Then, by using the leaf spring clamp 101 or the like to fasten the pipe 200, the sealing property and the retaining property are secured.

By the way, in order to secure a high sealing property and a slip-out preventing property only by fastening with a clamp or the like, it is desirable to bring the inner peripheral surface of the hose and the outer peripheral surface of the pipe into close contact with each other and increase the frictional resistance therebetween. Therefore, a ring-shaped ridge is formed at the tip of the pipe, and the diameter of the hose is expanded by the ridge to generate a tightening force due to the elastic reaction force of the hose, thereby increasing the pressure contact force with the pipe.

A curved water hose is manufactured by inserting a mandrel having a predetermined curved shape into an extruded unvulcanized rubber hose and vulcanizing in that state. However, there is a problem that a great amount of labor is required for the work of inserting the bent mandrel into the unvulcanized rubber hose and the work of pulling out the mandrel from the bent hose after vulcanization. Therefore, it has been attempted to apply a release agent to the inner peripheral surface of the unvulcanized rubber hose to reduce this labor due to the effect of reducing the frictional resistance by the release agent. There is a problem that the mold release agent adheres to the peripheral surface, which reduces the frictional resistance with the pipe and makes it easier for the hose to come off from the pipe.

Therefore, conventionally, the step of cleaning the hose and removing the release agent is generally performed before inserting the pipe.

[0006]

However, with the recent improvement in the performance of automobiles, the pressure of the cooling water is increased, and further improvement is required in the sealing property and the retaining property of the water hose. It is effective to make the outer diameter of the ridge at the tip of the pipe larger than the inner diameter of the hose in order to give the hose a large elastic tense force, and the greater the difference, the greater the tense force. However, the larger this difference is, the more labor is required to insert the pipe into the hose, and the workability is deteriorated.

Further, the number of man-hours required for the cleaning step for removing the release agent is great, and if possible, the cleaning step can be omitted so that even if the release agent is attached, high retaining property can be obtained. It is desirable to do. Furthermore, when assembling the curved hose with the mating member, it is necessary to assemble the hose in the correct direction and position. For this reason, a marking step of marking the outer peripheral surface of the hose with a marker pen or the like is performed, but the number of steps is also large.

The present invention has been made in view of such circumstances, and a hose having a high retaining performance even when a releasing agent is adhered to the hose without exerting a great tension. The purpose is to

[0009]

Means for Solving the Problems A first method for solving the above problems is described below.
The hose of the invention is characterized in that the inner peripheral surface of the end portion into which the mating member is inserted has a concave portion that engages with a protrusion formed on the outer peripheral surface of the mating member. The hose of the second aspect of the invention, which is a more desirable aspect of the hose of the first aspect of the invention, is characterized in that the concave portion referred to in the first aspect of the invention is a through hole penetrating the inner peripheral surface and the outer peripheral surface.

[0010]

In a general hose connection structure in which a mating member is inserted into a hose and is fastened from the outer peripheral surface of the hose with a clip or the like, there is a phenomenon that the fastening strength increases as the inner diameter of the hose increases. This is because the larger the inner diameter of the hose, the larger the area of the surface in contact with the mating member. Therefore, the smaller the diameter of the hose, the smaller the pull-out strength.

However, in the hose of the present invention, when the mating member is inserted, the projection formed on the outer peripheral surface of the mating member engages with the recess formed on the inner peripheral surface of the hose, thereby improving the pull-out strength. To do. This pull-out strength is mechanical due to the engagement of the projections and recesses, and does not depend on the frictional force or adhesion between the hose and the mating member, so the pull-out strength is independent of the inner diameter of the hose. It is improved, and it is effective especially in the case of a small diameter hose. And even if it does not have such a great tense force, and even if the release agent adheres, a high pull-out strength can be obtained.

Further, the insertion position of the mating member can be regulated by the engagement of the projection and the recess, and the connection direction and the positioning of the hose can be easily confirmed. Further, in the hose of the second aspect of the invention, since the concave portion is the through hole, when the projection of the mating member exists inside the through hole, the projection is exposed to the outside. Therefore, it is possible to visually confirm that the mating member has been completely inserted, making it easier to confirm and position the connection direction of the hose, and to eliminate the conventional marking on the hose. it can. If the surface of the protrusion is colored, it is easier to confirm it, and the wrong assembly can be easily discriminated with the naked eye.

[0013]

EXAMPLES The present invention will be specifically described below with reference to examples. The hoses in the following examples relate to water hoses for automobiles. (Embodiment 1) FIGS. 1 and 2 show a hose of this embodiment and a pipe 2 inserted into the hose 1. This hose 1 is made of rubber having a reinforcing yarn layer, and one through hole 10 penetrating the inner peripheral surface and the outer peripheral surface is formed in the vicinity of the end surface of the hose 1. The through hole 10 is formed by forming the hose 1 after molding and vulcanization.

This hose 1 comprises a pipe 2 which is a mating member.
It is used by concluding with. The pipe 2 has a ring-shaped ridge 2 whose outer diameter increases toward the rear end.
One protrusion 2 having a triangular cross section, which has 0, and whose height increases toward the rear on the outer peripheral surface behind the ridge 20.
1 is formed. Further, a collar 22 is provided behind the protrusion 21.
Are formed. The distance between the protrusion 21 and the collar portion 22 corresponds to the distance between the through hole 10 of the hose 1 and the end surface.

When inserting the hose 1 into the pipe 2, the diameter of the hose 2 is first expanded by the ridge 20 and then by the projection 21. Then, at the position where the tip of the hose comes into contact with the collar portion 22, the projection 21 engages with the through hole 10, and the hose 1 becomes the collar portion 2
The relative movement in the front-rear direction is restricted by 2 and the protrusion 21.
Moreover, the relative movement in the circumferential direction is restricted by the engagement between the protrusion 21 and the through hole 10.

At this time, by engaging the projection 21 with the through hole 10, the hose 1 and the pipe 2 can be positioned in the circumferential direction. Further, it is possible to prevent the insertion direction of the hose 1 from being mistaken depending on the presence or absence of the through hole 10.
Therefore, it is extremely effective when the hose 1 has a bent shape. Further, in this embodiment, the through hole 10 extends from the projection 2
The head of 1 appears. Therefore, by distinguishing the color of the protrusion 21 from the other parts of the pipe 2, it is possible to determine whether or not the protrusion 21 and the through hole 10 are engaged with each other only by looking from the outside.

In this state, the clamp 3 is attached from the outer peripheral surface of the hose 1 to a position corresponding to the ridge 20 and the protrusion 21, and the hose 1 is fastened to the pipe 2. In the fastening structure of the hose 1 thus obtained, the clamp 3 is fastened with the same strength as the conventional one, so that the hose 1 is brought into close contact with the pipe 2 and the same sealing performance as the conventional one is secured. Further, the movement of the hose 1 in the removing direction is performed by the engagement of the projection 21 and the through hole 10 in addition to the tightening force of the hose 1 generated by the diameter expansion by the protrusion 20 and the fastening force by the clamp 3 as in the conventional case. Since it is strictly regulated, it is possible to obtain significantly higher pull-out strength than before. Therefore, ridge 2
Even if the height of 0 is not very high and the tightening force generated in the hose 1 is small, and the mold release agent is attached to the inner peripheral surface of the hose 1, the omission during use is reliably prevented. (Embodiment 2) A hose of this embodiment is shown in FIGS.
The hose 6 has an enlarged diameter portion 60 at its tip, and the enlarged diameter portion 60 has an elliptical cross section. The expanded diameter portion 60 has a pair of through holes 61 formed on the short axis side of the cross section symmetrically with respect to the long axis. The cross-sectional shape of the portion other than the enlarged diameter portion 60 is a perfect circle, and the inner diameter thereof is the same as the inner diameter of the enlarged diameter portion 60 on the minor axis side.

The pipe 5 is inserted into the hose 6.
The pipe 5 has the same structure as that of the pipe of the first embodiment except that a pair of projections 50 are provided in axial symmetry. Pipe 5
When inserting, the pipe 5 is inserted while elastically deforming by pressing the major axis side of the expanded diameter portion 60 of the hose 6 in the radial direction. As a result, the enlarged diameter portion 60 has a substantially circular cross section, and the inner diameter on the minor axis side increases, so that the insertion resistance due to the protrusion 50 is reduced and the pipe 5 can be inserted very easily. When the through hole 61 reaches the position of the protrusion 50, the expanded diameter portion 60
By releasing the pressing of the, the expanded diameter portion 60 is restored to its original shape by its elasticity, and the through hole 61 engages with the protrusion 50, and the same effect as that of the first embodiment is achieved.

In the above embodiment, an example in which the pipe is clamped is shown, but the present embodiment is not limited to this, and the structure of this embodiment uses a metal sleeve for the pipe to crimp the hose. It goes without saying that it can be applied to the structure. The shapes of the protrusion and the recess are not particularly limited, but it is needless to say that it is desirable that the recess has a circular cross-section or the like if they complement each other, that is, if the protrusion has a cylindrical shape, for reliable engagement.

[0020]

In other words, according to the hose of the present invention, the recessed portion engages with the projection, so that the pull-out strength after assembly with the mating member is significantly improved. Also, even if the hose does not generate a very high tension after assembly, or if the mold release agent adheres to the inner surface of the hose, a high pull-out strength can be obtained without depending on them, so the mating member Insertion workability can be improved.

If the recess is a through hole, incorrect assembly can be prevented, the insertion direction of the hose can be confirmed and the insertion positioning can be reliably performed, and the conventional marking step can be eliminated. .

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a hose according to an embodiment of the present invention together with a mating member.

FIG. 2 is a cross-sectional view of essential parts showing a hose of an embodiment of the present invention assembled to a mating member.

FIG. 3 is a sectional view of a main part of a hose according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of essential parts showing a hose of a second embodiment of the present invention assembled to a mating member.

FIG. 5 is an explanatory view of a conventional water hose mounting structure.

[Explanation of symbols]

1: Hose 2: Pipe (mate)
3: Clamp 10: Through hole (recess) 21: Protrusion

Claims (2)

[Claims] 1. A hose characterized in that the inner peripheral surface of the end portion into which the mating member is inserted has a recess for engaging with a projection formed on the outer peripheral surface of the mating member. 2. The hose according to claim 1, wherein the recess is a through hole penetrating the inner peripheral surface and the outer peripheral surface.