JPH0680085U - Rubber hose - Google Patents

Abstract

(57) [Summary] [Purpose] To provide at low cost a rubber hose capable of restricting the movement of the inner wire in either axial direction. [Structure] In the rubber hose 10 in which the ridge 12 for restricting the axial movement of the inner wire 24 is formed on the inner circumference, the ridge 12 is intermittent and the ridge 1
A rubber hose characterized in that a groove 14 is formed on the outer periphery of the portion where 2 exists.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rubber hose used for a radiator hose or the like of an automobile.

[0002]

[Prior art]

 Since such a rubber hose must not buckle and block when the inside is in a decompressed state, a coiled wire (inner wire) is inserted inside and stretched from the inside. By the way, since this inner wire has to be fixed in the rubber hose, as shown in Japanese Utility Model Laid-Open No. 27080/1990, a ridge is formed on the inner circumference of the rubber hose in the form of a flange, and the inner wire is formed by this flange. I try to stop the edge of.

[0003]

[Problems to be solved by the device]

 However, in reality, it is not easy to form such a convex shape on the inner circumference of the rubber hose. Generally considered is a method in which a bandage is tightly wrapped around the outer circumference of a rubber hose and the ridge is projected on the inner circumference by the banding's tightening force when the bandage is in a softened state immediately before vulcanization. It requires skill and is expensive.

Further, even if a ridge can be formed by this method, the ridge becomes continuous in the circumferential direction, and when the end of the inner wire is stopped by this, movement on one side in the axial direction is restricted. Even if it can, the movement on the other side cannot be regulated. In order to solve this, it is necessary to take a structure in which both sides of the ridge are sandwiched by inner wires, but this requires that the spiral portion of the inner wire be able to pass between the ridges while maintaining a constant outer diameter. The ridges must be formed intermittently.

However, in order to do such a thing, there is only a method by die molding or machining after molding, and the cost becomes higher. The present invention solves such a problem, and can be formed by extrusion molding at low cost, and further, the ridges can be formed intermittently.

[0006]

[Means for Solving the Problems]

 In view of the above problems, the present invention provides a rubber hose in which a ridge for restricting the axial movement of the inner wire is formed on the inner circumference in the circumferential direction, and the ridge is intermittent and the ridge is The present invention provides a rubber hose characterized in that a concave groove is formed on the outer circumference of the portion where the rubber hose exists.

[0007]

[Action]

 With the above configuration, even if both sides of the ridge are sandwiched by the inner wire, the spiral part can extend between the ridges so that the movement in both the axial directions can be regulated. Further, since the thickness of the ridge portion is not so different from that of the remaining portion, the overall strength and flexibility are made uniform.

[0008]

【Example】

 FIG. 3 is a horizontal cross-sectional view of the rubber hose according to the present invention, and FIG. 4 is a partial vertical cross-sectional view of the rubber hose. In the inner circumference of the rubber hose 10, a ridge 12 which is not continuous in the circumferential direction (interrupted) is formed. The concave groove 14 is formed on the outer periphery of the portion where the ridge 12 is present. The number of the ridges 12 in this embodiment is three, but this is an example, and the number thereof can be appropriately determined. In short, since the ridges 12 are for locking the inner wire, as will be described later, the ridge 12 exerts a sufficient locking force, and moreover, the outer diameter of the inner wire is increased between the ridges 12. Any material that can be stretched without being reduced in size may be used.

FIG. 6 is an explanatory view showing a method of forming such a convex strip 12 and concave grooves 14. The convex strip 12 corresponds to the size and number of the concave grooves 14 in the ring body 16. It is easy to use the molding tool 20 in which the mold 18 is housed so as to project in the radial direction. That is, when the rubber hose 10 is molded and vulcanized (whether before or after the vulcanization), the molding tool 20 is fitted to the outer circumference of the rubber hose 10 and the molds 18 are made to project synchronously. The portion pressed by the mold 18 is recessed to form a groove 14, and the inner circumference of the portion is protruded inward while maintaining an appropriate wall thickness, which becomes the ridge 12.

Although FIG. 5 shows another embodiment of the present invention, the above-described molding can be performed even when the rubber fiber hose 10 has a reinforcing fiber reinforcing layer 22 inserted therein. That is, when the mold 18 is inserted to form the convex strip 12 and the concave groove 14, the fiber reinforcing layer 22 can be partially extended and the state in which the fiber reinforcing layer 22 is inserted to the thickness of this portion can be maintained. In this case, the fiber reinforcing layer 22 is preferably elastic to some extent.

FIG. 1 is a vertical cross-sectional view of the rubber hose A into which the inner wire 24 is inserted, and FIG. 2 is a horizontal cross-sectional view. The inner wire 24 has an end pitch corresponding to the width of the ridge 12. Then, if the ridge 12 is sandwiched between these portions, it can be locked so as not to move in either direction. In this case, the spiral portion of the inner wire 24 must extend across the portion where the ridge 12 exists, but by making this intersecting portion (angle α in FIG. 2) the portion where the ridge 12 does not exist, this It is possible.

[0012]

[Effect of device]

 As described above, since the present invention is the one described above, the extrusion-molded rubber hose can be used as it is, and the ridges and the like can be extremely easily molded by using the molding tool described above. Therefore, it can be manufactured at a very low cost. Further, since the wall thickness of the ridge portion and the remaining portion can be almost the same, the strength and flexibility of the entire rubber hose are made uniform.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view showing an embodiment of the present invention with an inner wire inserted into a rubber hose.

FIG. 2 is a cross-sectional view showing a state in which an inner wire is inserted into a rubber hose showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a rubber hose showing an embodiment of the present invention.

FIG. 4 is a partial vertical sectional view of a rubber hose showing an embodiment of the present invention.

FIG. 5 is a cross-sectional view of a rubber hose showing another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a state in which a ridge is formed on a rubber hose showing another embodiment of the present invention.

[Explanation of symbols]

 10 Rubber Hose 12 Convex Strip 14 Groove 22 Fiber Reinforcement Layer 24 Inner Wire

Claims (2)

[Scope of utility model registration request] 1. A rubber hose having a ridge formed in the circumferential direction on the inner circumference for restricting axial movement of an inner wire, wherein the ridge is intermittent and the outer circumference of a portion where the ridge exists. A rubber hose having a groove. 2. The rubber hose according to claim 1, which has a thick fiber reinforcement layer.