JPH0587397U - Hose protector - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a protector that can improve the heat insulating property at low cost by effectively devising the shape. [Structure] A plurality of voids 11 extending in the axial direction and opening to the outside are arranged in the tubular body 1 in the circumferential direction. Cylindrical body 1 at a portion corresponding to partition wall portion 12 that separates void portion 11
A plurality of protrusions 13 extending in the axial direction are provided on the inner peripheral surface of the. The gap portion 14 formed between each void portion 11 and the hose 2 acts as an air heat insulating layer. Since the external force applied to the protector is reliably received by the partition wall portion 12 and the projection portion 13, the void portion 11 of the tubular body 1 is not crushed by the external force, and a stable heat insulating action is always exhibited.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hose protector that protects a rubber hose arranged in, for example, an engine room of an automobile from heat and interference.

[0002]

[Prior Art]

 Various hoses such as fuel hoses and power steering hoses are installed in the engine room of automobiles. In addition, since the engine compartment also contains parts such as exhaust manifolds and exhaust pipes that become hot, the hoses described above are usually installed so as to avoid contact with or close to these hot parts. is there.

By the way, in recent years, as the performance of automobiles has increased, the packing density in the engine room has increased. As a result, there are restrictions on the installation space, and there are cases in which the hoses have to be installed in close proximity to the high temperature part to some extent, and there are cases in which they must be used in contact with other parts. Therefore, the outer surface of the hose is covered with a protector made of an elastic material to reduce the influence of heat from high temperature parts and protect it from interference while maintaining flexibility.

As a material for such a protector, a foamed polymer material such as sponge rubber is advantageous in order to prevent a heat effect on the hose. On the other hand, in order to protect from interference with other parts, polymer materials such as non-foamed solid rubber and soft plastic having excellent wear resistance are advantageous. Therefore, Japanese Unexamined Patent Publication No. 88-3186 discloses a protector that makes use of both the heat insulating properties of a foamed polymer material and the wear resistance of a non-foamed polymer material. That is, this protector is composed of a foamed tubular body made of a foamed soft polymer material and a covering portion made of a non-foamed soft polymer material that covers the outer periphery of the foamed tubular body.

[0005]

[Problems to be solved by the device]

 However, the manufacturing cost of the conventional protector made of two kinds of materials is high. Therefore, it is required to inexpensively manufacture a protector having heat insulating properties and abrasion resistance without using plural kinds of polymer materials. Then, a method of providing a void portion in the protector and utilizing the air layer existing in the void portion as a heat insulating layer is considered.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a protector for a hose that is inexpensive and can effectively improve heat insulation property by devising a shape.

[0007]

[Means for Solving the Problems]

 The hose protector of the present invention comprises an elastic tubular body mounted on the outer peripheral surface of the hose, and a plurality of voids extending in the axial direction and opening to the outside are disposed in the tubular body in the circumferential direction. The inner surface of the cylindrical body corresponding to the partition wall that separates the gap is provided with a plurality of projections that extend in the axial direction and contact the outer surface of the hose when mounted on the hose. Is characterized by.

[0008]

[Action]

 In the protector for a hose of the present invention, a plurality of voids that extend in the axial direction and open to the outside are arranged in the cylindrical body in the circumferential direction. The air layer existing in this void acts as a heat insulating layer, and the heat insulating property is improved. Further, on the inner surface of the cylindrical body, a plurality of protrusions extending in the axial direction are provided at the portions corresponding to the partition walls separating the adjacent voids. Therefore, when the protector of the present invention is attached to the hose, a gap is formed between the protector and the hose, and the air layer existing in this gap also improves the heat insulating property.

As described above, since the protrusion is provided on the inner peripheral surface of the tubular body corresponding to the partition wall portion that separates each void provided in the tubular body, the protector attached to the hose is provided. The external force applied to the shaft can be reliably received by the protrusion being crushed and deformed so as to eliminate the gap between the outer peripheral surface of the hose and the inner peripheral surface of the protector. Therefore, it is possible to effectively prevent the void portion provided in the tubular body from being crushed by the external force, and it is possible to always exhibit a stable heat insulating action.

[0010]

【Example】

 Hereinafter, a specific description will be given with reference to examples. 1 to 3 show a protector for a hose according to an embodiment of the present invention. This protector is formed by extrusion molding from heat resistant rubber (EPDM) having excellent wear resistance and forms a cylindrical body 1 having an outer diameter of 20.5 mm and an inner diameter of 15.5 mm and a circular cross section.

The tubular body 1 is formed with 16 voids 11 penetrating in the axial direction, which are evenly arranged in the circumferential direction. The gaps in the circumferential direction of the voids 11 are set so that the central angles at both ends of the voids 11 in the circumferential direction are 11.5 degrees. Further, the intervals in the circumferential direction of the partition walls 12 that separate the adjacent voids 11 are set so that the central angles at both circumferential ends of the partition walls 12 are 11 degrees.

On the inner surface of the tubular body 1, projections 13 projecting toward the centripetal direction are formed at the portions corresponding to the partition walls 12 partitioning the adjacent voids 11. Each protrusion 13 extends in the axial direction from one end of the tubular body 1 to the other end. The height of the protrusion 13 is 0.8 mm, and the diameter of the inscribed circle connecting the tips of the protrusions 13 is set to be slightly smaller than the outer diameter of the hose 2 to be inserted.

Since the protector of this embodiment has a plurality of protrusions 13 on the inner surface of the tubular body 1, when mounted on the hose 2, the friction resistance with the outer surface of the hose 2 is small, and the protector can be easily inserted. You can Further, in the mounted state, as shown in the cross-sectional view of FIG. 3, a void portion 11 provided in the tubular body 1 and penetrating in the axial direction, and a gap formed between each of the projecting portions 13 between the tubular body 1 and the hose 2. Since the air layer existing in the gap portion 14 acts as two heat insulating layers, the protector of this embodiment exhibits extremely excellent heat insulating properties.

Since the projection 13 is provided on the inner peripheral surface of the tubular body 1 at a position corresponding to the partition wall portion 12 that separates each void 12 provided in the tubular body 1, the hose 1 is provided with The external force applied to the attached protector can be reliably received by the protrusion 13 and the partition 12. Therefore, it is possible to effectively prevent the voids 11 provided in the tubular body 1 from being crushed by the external force, and it is possible to always exhibit a stable heat insulating effect.

Further, since the hose protector of this embodiment can be manufactured by extruding one kind of rubber, it can be manufactured inexpensively and easily. In particular, if a non-foaming elastic material is used, a protector having excellent wear resistance can be obtained. The protector may be made of an elastic material, and rubber, soft resin, sponge rubber, sponge resin, or the like may be appropriately selected and used according to the usage conditions.

The number and shape of the voids 11 and the protrusions 13 are not particularly limited, and the design can be changed as appropriate.

[0017]

[Effect of the device]

 As described in detail above, the hose protector of the present invention is effectively improved in heat insulating property due to its shape, so that it is not necessary to use plural kinds of polymer materials to obtain effective heat insulating property. . Therefore, by manufacturing the protector of the present invention using only an elastic material having excellent wear resistance, it is possible to provide a protector having excellent properties of both heat insulation and wear resistance at low cost.

In the hose protector of the present invention, the protrusion provided on the inner surface of the cylindrical body reduces the contact area with the outer surface of the hose and reduces the frictional resistance. The property is also improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a hose protector according to an embodiment.

FIG. 2 is a cross-sectional view of the hose protector.

FIG. 3 is a cross-sectional view showing a state in which the hose protector is attached to a hose.

[Explanation of symbols]

 1: Cylindrical body 2: Hose 11: Void 12: Partition 13: Projection

Claims (1)

[Scope of utility model registration request] 1. A protector to be mounted on the outer peripheral surface of a hose, which is made of an elastic tubular body and is provided with a plurality of voids extending in the axial direction and opening to the outside in the circumferential direction. A plurality of protrusions that extend in the axial direction and that contact the outer surface of the hose when mounted on a hose are provided on the inner surface of the cylindrical body that corresponds to the partition wall that separates the void. A protector for hoses characterized by the following.