JP2001221052A - Intercooler hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intercooler hose easy for assembing and capable of improving vibration absorptivity by increasing flexibility of bending and compressivity at a bellows part, reducing transmission of low frequency sound to cause generation of cab booming noise, improving bending flexibility at the bellows part for the purpose of providing the intercooler hose improving pressure resistance (positive pressure and negative pressure) and improving negative pressure resistance. SOLUTION: The bellows part 2 is provided at a part except for an insertion margin of an intercooler hose 1, the bellows part 2 is formed larger in a radius of curvature forming a crest part 20 than a radius of curvature forming a trough part 2i, thickness T3 of the trough part 2i is formed thicker than thickness T2 of the crest part 2o and an axis of the intercooler hose 1 is formed at least in a straight line in a state before it is arranged between an intercooler IC and an engine E on the intercooler hose 1 provided between the intercooler IC to cool suction air compressed by a supercharger and raised in temperature and the engine E.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interler hose provided between an intercooler for cooling intake air compressed and heated by a supercharger and an engine, on a hot side of a forward path and a cool side of a return path. More particularly, the present invention relates to a technique for improving vibration absorption, negative pressure resistance, detachability, productivity, and the like of an intercooler hose.

[0002]

2. Description of the Related Art The performance required of an intercooler hose is as follows: (a) withstand high pressure and high temperature air compressed by a turbocharger; (a) withstand pressure to withstand positive pressure; and (b) heat resistance withstand high temperature. General performance as a hose, such as (c) vibration absorption, which withstands relative vibration between the air conditioner and the intercooler, is required, and the required performance is becoming severer as the performance of the engine becomes higher.

[0003] In addition, inherent performance requirements of the intercooler hose include (d) a negative pressure resistance for preventing a decrease in the intake air amount due to a collapse of the hose due to a negative suction pressure, and a muffled sound (derived from a low frequency sound) in the cab chamber. And (e) vibration suppression performance for preventing transmission of pressure waves from the hose that causes the generation.

[0004] The various performances required for the above intercooler hoses are often contradictory, but total harmony is essential. For example, in order to prevent the hose from coming off due to the expansion of the hose due to high pressure, (a) if the pressure resistance is improved and the hose body is reinforced by increasing the reinforcing layer,
(C) There is a tendency that vibration absorption is sacrificed.

For this reason, conventionally, for example, the total length of the hose with respect to the inner diameter of the hose has been increased to 4 to 5 times or more, and (c) deterioration of vibration absorption has been prevented. However, increasing the total length originally resulted in an increase in component costs for an intercooler hose that often uses expensive rubber.

On the other hand, in the case where (c) vibration absorption or (e) vibration damping performance is insufficient, conventionally, a steel wire ring is fitted around the outer periphery of the hose to provide a restraining force. This method may deteriorate the hose assemblability depending on the number of rings and the position where they are fitted.

The present invention proposes an intercooler hose that incorporates the results obtained by adding a large amount of experiments to the conventional results in consideration of the above conditions.

In the conventional intercooler hose 1A shown in FIG. 5, a straight cuff portion A and a cuff portion C are inserted into an engine E side and an intercooler IC side, respectively, and a bellows J is formed in an intermediate curved pipe portion B. It is configured to possess bending elasticity, elongation and compression elasticity. And
Functionally, it functions to absorb vibration displacement, suppress the hose diameter from increasing due to the boost pressure, and suppress the hose diameter from shrinking and deforming due to the negative pressure when the boost pressure is reduced. Is configured.

Symbols L1 and L2 in the drawing indicate the insertion allowances for the engine E and the intercooler IC, respectively, and the intercooler hose 1A mainly deforms and absorbs vibrations based on this as a base of relative displacement.

As shown in FIG. 6, the bellows J having the bending elasticity and the stretching elasticity has a radius of curvature in a radially inward direction with an outer diameter do from an end of the cuff portion A to an end of the cuff portion C as shown in FIG. Rbj and radius of curvature R in the radially outward direction
dj, and the radius of curvature Raj in the radially inward direction and the radius of curvature Rcj in the radially outward direction are smoothly and continuously formed at the inner diameter di to form a bellows shape at the equal wall pressure Tj. I have. Further, the radius of curvature Rbj = Rcj,
The bellows shape of Raj = Rdj holds the pressure resistance, particularly the negative pressure deformation resistance, together with the elongation, compression and bending flexibility.

However, in the conventional intercooler hose 1A, the relative displacement caused by the vibrations of the engine E and the intercooler IC sometimes does not sufficiently follow the displacement due to lack of flexibility, and there is a concern that the hose may come off. Also, the negative pressure resistance was not completely satisfactory.

In the case of a bent hose as shown in FIG. 5, the reinforcement of the hose rubber with a reinforcing cloth is manually wound by a skilled worker so as to form a bellows while following the bent shape. That is, since the production is performed manually by a skilled worker, the production cost and the production time are increased, and in addition, there is a problem in the production technology that the products cannot be made uniform. For the reasons described above, it has conventionally been considered difficult to mechanically manufacture the intercooler hose with power.

FIG. 7 shows another (conventional) intercooler hose 11A different from that described above with reference to FIGS. 5 and 6, wherein an intercooler hose 11 having a curved pipe portion 14A is shown.
In A, a ring Rg, which is a ring-shaped body of an elastic wire, is attached to the outside of the pipe in order to maintain a pressure resistance against a positive pressure and / or a negative pressure. Here, the ring Rg is attached to an outer concave portion (one concave portion in the figure) radially outward of the bellows-shaped curved pipe portion 14A, and achieves a pressure resistance performance and a vibration suppression performance of the hose 11A. I am doing it.

8 and 9, a hose T of the same type as the hose 11A in which the above-described ring Rg is attached to the bellows portion is represented by a symbol T. 8 and 9
Shows how to attach a La hose T (a hose of the same type as the hose 11A shown in FIG. 7) that is longer than the hose attachment distance Ld by the insertion margin 2Li. That is,
At the time of attachment, first, the hose T is bent and compressed into a dimension (Ls) having a margin (short) with respect to the distance Ld between the attachments, to form a curved portion with the symbol M, and the engine side pipe Pe and the intercooler side pipe Pic. Attach to

However, in the hose of the type shown in FIG. 7 (hose having a ring Rg), when the hose T is bent and compressed, since the ring Rg is provided, the bending is not easy and it becomes difficult to attach and detach. As a result, not only workability is poor, but also external force is applied to the pipe parts Pe and Pic,
There is a risk of damage.

[0016]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, is easy to assemble, and increases bending, elongation and compressibility of the bellows. The purpose of the present invention is to provide an intercooler hose that improves vibration absorption, reduces transmission of low-frequency noise that causes cab booming noise, and further improves pressure resistance (positive pressure and negative pressure). .

[0017]

An intercooler hose according to the present invention is an intercooler hose disposed between an intercooler for cooling intake air compressed and heated by a supercharger and an engine. A bellows portion is provided in a portion other than the margin (more specifically, a portion other than the cuff portion), and the bellows portion is formed such that a radius of curvature forming a peak is larger than a radius of curvature forming a valley. The thickness of the intercooler hose is formed to be thicker than the thickness of the mountain portion, and the axis of the intercooler hose is formed linearly before being disposed at least between the intercooler and the engine.

In the above description, the peaks and valleys are portions that project outward in the radial direction as viewed from the inside of the bellows portion, and those that project inward in the radial direction are valleys. The intercooler hose is formed in a straight pipe while retaining flexibility due to the shape of the bellows portion and improving resistance to negative pressure deformation.

It is preferable that the bellows portion is formed such that the radius of curvature forming the outer diameter of the peak portion is three times or more the thickness of the peak portion.

Due to the above-mentioned crest shape, bending of the hose,
Flexibility to elongation and compression is obtained.

The cloth-like member forming the reinforcing layer of the intercooler hose has a mesh formed in a bias direction, and the mesh is preferably formed as a mesh using relatively thin but densely knitted fibers. .

The above-mentioned cloth member increases flexibility without reducing the pressure resistance (positive pressure and negative pressure) performance.

Further, the intercooler hose of the present invention comprises:
In the intercooler hose disposed between the engine and the intercooler that cools the intake air compressed and heated by the supercharger, a bellows portion is provided at a portion other than the insertion allowance of the intercooler hose, and the intercooler hose is provided. Except for a portion to be bent (a predetermined position of the bellows portion) when being disposed between the intercooler and the engine, a ring-shaped ring is provided on the outer periphery of the bellows portion.

Here, the "point to be bent when the intercooler hose is arranged between the intercooler and the engine (predetermined position of the bellows portion)" is near the center of the bellows portion, see FIG. And a distance N described later. This distance (reference numeral N in FIG. 3) specifically means a distance of 0.7 times or more the inner diameter of the hose from the center of the bellows portion in the hose axis direction.

Alternatively, the intercooler hose of the present invention is an intercooler hose disposed between an intercooler that cools intake air compressed and heated by a supercharger and an engine, in a portion other than the insertion allowance of the intercooler hose. A bellows portion is provided, and a protective member (protector) having an inner diameter equal to or slightly smaller than the outer diameter of the intercooler hose and the outer diameter of the bellows portion is provided, and the protective member is arranged so as to surround the bellows portion. Have been.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an intercooler hose of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an intercooler hose 1 according to an embodiment of the present invention, and a cuff portion 3 of an end straight pipe.
The cuff portion 5 and the bellows portion 2 in the middle are formed in a straight line as a whole. In FIG. 1, reference numeral 4 denotes a mounting portion of the insertion allowance L4 to the engine E, and reference numeral 6 denotes a mounting portion of the insertion allowance L6 to the intercooler IC.

The intercooler hose 1 is formed of a reinforcing cloth finely knitted with a fine thread so as to be of a medium reinforcing type. Also in this point, it differs from the conventional intercooler hose which uses the conventional thick thread and is coarsely knitted.

As shown in FIG. 2 by enlarging a local portion A in FIG. 1, the bellows portion 2 has an inner diameter di (or inner wall surface) and an outer diameter do (or outer diameter) from the end of the cuff portion 3 (or cuff portion 5). Surface) is smoothly continuous with a plurality of curvatures to form a bellows shape.

As is clear from FIG. 2, the bellows 2 is
It is composed of a peak 2o protruding radially outward and a valley 2i protruding radially inward. And the inner diameter di
The side is composed of two types of curves of the curvature radii Rc and Ra, and the curvature radius from the inside of the hose of the peak 2o (the peak 2
The radius of curvature of the inner wall surface side of o is Rc, and the radius of curvature of the valley portion 2i (the radius of curvature of the inner wall surface side of the valley portion 2i) is smaller than the radius of curvature Rc of the inner wall surface side of the ridge portion 2o. ). That is, the curved surface of Rc and the curved surface of Ra form a half pitch, and the inner wall surface of the bellows portion 2 is formed smoothly and continuously at an equal pitch.

On the outer diameter do side (outer surface side), the radius of curvature of the minimum diameter portion of the valley 2i (the radius of curvature of the outer surface side of the valley 2i) is Rb, and the radius of curvature of the peak 2o (peak 2o). Is defined as Rd, and the radius Rb and the radius Rd are smoothly connected.

The magnitude of each of the above radii of curvature is R
d> Ra, Rc> Rb, and the thickness of the hose is such that the thickness T1 of the cuffs 3 and 5 = the thickness T2 of the peak 2o <the thickness T3 of the valley 2i. ing.
Also, the radius of curvature Rd of the peak 2o ≧ the thickness T2 of the peak 2o ×
It is formed three times larger.

As described above, the bellows portion 2 is formed by making the radius of curvature Rd of the ridge portion 2o convex outwardly from the inside of the hose larger than the radius of curvature Ra of the valley portion 2i convexly inward. I have.
Since the radius of curvature Ra of the valley portion 2i is small and the wall thickness is large, negative pressure resistance is increased and low frequency transmission into the cab is reduced, thereby suppressing the generation of muffled noise.

If the flexibility is within a practically allowable range, a straight pipe may be provided at a part of the bellows 2 in FIG. In other words, in the embodiment of FIGS. 1 and 2, portions other than the insertion allowance (more specifically, the cuff portions 3 and 5
The bellows portion 2 may be provided in the entire region (other portion), or the bellows portion 2 may be provided only in a part of the portion other than the insertion allowance.

Since the intercooler hose 1 is formed at least at the time of its manufacture (before being arranged between the intercooler and the engine), it is formed in a straight line. Since there is no need to perform hose formation (by a skilled worker),
It is possible to automate using mechanical means.

The intercooler hose 1 having the above structure can be easily attached to the engine E and the intercooler IC by bending the hose in the manner shown in FIG. And engine E and intercooler IC
Is absorbed by the flexibility of the bellows portion 2 in bending, extension and compression. Further, when the intake air has a negative pressure, the tube is prevented from being crushed by the negative pressure-resistant shape of the concave portion 2i. Therefore, so-called breathing due to a change in the intake air amount does not occur. And according to the intercooler hose 1 of the said structure,
Due to its bending flexibility, it can handle complicated layouts.

FIG. 3 shows an intercooler hose 11 according to another embodiment of the present invention.
3, a cuff portion 15, and a bellows portion 12 of a curved tube in the middle are formed in a curved shape as a whole.

The intercooler hose 11 is formed of a thick yarn and coarse knitting reinforcing cloth used for a conventional reinforcing cloth, and is formed in a medium reinforcing type.

The bellows portion 12 is formed simply by turning the bellows of the bellows upside down and having the same radius of curvature, and the outer diameter of the bellows portion 12 is set at an intermediate portion of the bellows portion 12 except for a range of a predetermined distance N from the center of the hose axis. Ring Rg which is a ring-shaped body made of an elastic material in the concave portion
Is attached.

The distance N is a distance between C1 and C2 in FIG. 3 and is preferably 70% or more of the inner diameter di of the hose. It should be noted that if the distance N is increased, the damping effect of the ring Rg becomes weaker, which may lead to deterioration of noise including muffled sound.

This intercooler hose 11 can be manufactured without changing the conventional manufacturing mold and working procedure.

The bellows portion 12 in the region where the ring Rg does not exist (the region indicated by the distance N) increases the bending flexibility of the intercooler hose 11 of FIG. 3 and facilitates attachment and detachment to the engine E and the intercooler IC. Has become. That is, the attachment according to the procedure shown in FIGS. 8 and 9 is facilitated, and an external force is partially applied.
Damage is also prevented.

FIG. 4 shows still another embodiment of the present invention, which is a modification of the embodiment shown in FIG. The intercooler hose 21 shown in FIG. 4 has a cuff portion 23 of a straight pipe at the end, a cuff portion 25, and a bellows portion 22 of an intermediate curved tube.
FIG. 4 shows the entire curve.

The intercooler hose 21 is formed of a thick yarn and coarse knitting reinforcing cloth used for a conventional reinforcing cloth, and is formed in a medium reinforcing type.

The bellows portion 22 is formed simply by repeatedly forming the peak and valley shape of the bellows on the front and back sides having the same radius of curvature, and a tubular protector (protection member) 28 covering the outer diameter of the bellows portion 22 is provided in the middle of the bellows portion 22. Attached to. In other words, the inner diameter of the protector 28 is the same as or slightly smaller than the outer diameter of the bellows 22. The protector 28 is arranged so as to surround the bellows portion 22.

This prevents a pressure wave that induces a muffled sound in the cab chamber, or prevents the intercooler hose 2
Even when a noise such as an airflow noise is generated from 1, the protector 28 can cut off the noise and suppress the noise level to an allowable range.

From the bellows portion 22 to the cuff portion 23 and the cuff portion 2
A ring Rg which is a ring-shaped body made of an elastic material is attached to the outer diameter concave portions 22a and 22b at the ends connected to the respective members. This ring Rg is the same as that shown in FIG.

The attachment of the intercooler hose 21 of FIG. 4 to the engine E and the intercooler IC is performed as shown in FIG.
It can be carried out in the same manner as that shown in FIG.
This is because the rubber hardness of the protector 28 is selected so that the flexibility of the intercooler hose 21 is sufficient to bend the intercooler hose 21 even when the protector 28 is attached.

[0049]

The effects of the present invention are listed below. (1) According to the intercooler hose according to the embodiment of FIG. 1, the vibration absorption increases, and the hose follows the vibration displacement, so that the hose does not come off. (2) In addition, the hose becomes flexible, and can be easily attached to and detached from the engine and the intercooler, and can easily cope with a complicated layout. No damage will occur. (3) Furthermore, negative pressure resistance is improved by the shape in which the convex portion inward of the hose is thickened, and breathing due to the collapse of the hose is eliminated. (4) In addition, since the hose can be manufactured in a straight line, the winding of the reinforcing cloth can be mechanically wound, and the productivity can be improved. (5) According to the intercooler hose according to the embodiment of FIG. 3, it is possible to increase the bending flexibility without deteriorating the vibration damping performance, and to facilitate the detachment. Then, an engine layout with a short distance between hose attachments becomes possible. (6) According to the intercooler hose according to the embodiment of FIG. 4, noise generated from the intercooler hose can be prevented without sacrificing vibration damping performance.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an intercooler hose according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view showing a shape of a portion A of a bellows portion in FIG.

FIG. 3 is a side sectional view showing an intercooler hose according to another embodiment of the present invention.

FIG. 4 is a side sectional view showing an intercooler hose according to another embodiment of the present invention.

FIG. 5 is a side sectional view showing a conventional intercooler hose.

FIG. 6 is a partially enlarged view showing a bellows shape of the conventional intercooler hose of FIG.

FIG. 7 is a side sectional view showing a conventional intercooler hose having a bellows fitted with a reinforcing ring.

FIG. 8 is an explanatory view showing how to attach and detach an intercooler hose.

FIG. 9 is an explanatory view showing how to attach and detach an intercooler hose.

[Explanation of symbols]

 E: engine IC ······························································································································· ..Mounting parts 5, 15, 25. Cuffs 6. Mounting parts 28. Protectors (protective members)

Claims (5)

[Claims] 1. An intercooler hose disposed between an engine and an intercooler that cools intake air compressed and heated by a supercharger, wherein a bellows portion is provided at a portion other than the insertion allowance of the intercooler hose. The bellows portion is formed such that the radius of curvature forming the peak is larger than the radius of curvature forming the valley, the thickness of the valley is formed thicker than the thickness of the peak, and the axis of the intercooler hose is connected to the intercooler. An intercooler hose which is formed linearly at least before being disposed between the engine and the engine. 2. The intercooler hose according to claim 1, wherein the bellows portion has a radius of curvature forming an outer diameter of the peak portion that is at least three times the thickness of the peak portion. 3. A fabric member forming a reinforcing layer of the intercooler hose, wherein a mesh is formed in a bias direction, and the mesh is formed of a relatively thin but densely knitted fiber as a mesh. The intercooler hose according to claim 1 or 2. 4. An intercooler hose disposed between an engine and an intercooler that cools intake air compressed and heated by a supercharger, wherein a bellows portion is provided at a portion other than the insertion allowance of the intercooler hose. An intercooler hose, wherein a ring-shaped annular body is provided on the outer periphery of the bellows portion except for a portion to be bent when the intercooler hose is arranged between the intercooler and the engine. 5. An intercooler hose disposed between an engine and an intercooler that cools intake air compressed and heated by a supercharger, wherein a bellows portion is provided in a portion other than the insertion allowance of the intercooler hose. A protective member having an inner diameter equal to or slightly smaller than the outer diameter of the intercooler hose and the outer diameter of the bellows portion.