JP7088683B2 - Hose resonator connection structure - Google Patents

Description

The present invention relates to a hose resonator connection structure.

Patent Document 1 describes an air cleaner hose with a resonator in which an air cleaner hose for intake of an engine and a resonator as a sound deadening portion are integrally molded from a resin material. The air cleaner hose is formed with a bellows portion having flexibility.

Japanese Unexamined Patent Publication No. 8-34072

In the configuration described in Patent Document 1, if the resonator is enlarged in order to improve the sound deadening performance of the resonator, the resonator and the bellows portion of the air cleaner hose may interfere with each other when the air cleaner hose is deformed to the resonator side. .. This can result in crushing of the bellows. The air cleaner hose and the resonator are separate parts, and even if the structure is connected to each other, the same inconvenience as described above may occur.

It is an object of the present invention to provide a hose resonator connection structure capable of increasing the size of the resonator while avoiding interference between the bellows portion and the resonator.

The hose resonator connecting structure of the present invention connects to a hose in which a first opening, a bellows portion, and a first contact portion are sequentially formed in the longitudinal direction on an outer peripheral surface of an intermediate portion in the longitudinal direction, and the first opening. A second opening, a second contact portion facing the first contact portion, and a body portion are included, and the body portion is arranged between the second opening portion and the second contact portion. A resonator is provided, and the hose includes the first opening, the bellows, and the first contact portion, and the longitudinal intermediate portion about the hose axis is linearly extended. When a predetermined axis in the resonator parallel to the hose shaft is used as the resonator shaft, the first distance from the hose shaft to an arbitrary bellows outer peripheral position and the bellows outer peripheral position from the resonator shaft. The sum of the second distance to the body facing the hose shaft is the third distance from the hose shaft to the first contact portion and the fourth distance from the resonator shaft to the second contact portion. It is a hose resonator connection structure that is shorter than the sum.

According to the hose resonator connection structure of the present invention, the contact between the bellows portion and the resonator is avoided by the contact between the first contact portion and the second contact portion, so that the interference between the bellows portion and the resonator is avoided. It is possible to increase the size of the resonator while avoiding the above.

It is a perspective view which looked at the hose resonator connection structure of embodiment which concerns on this invention from above. It is the A arrow view of FIG. It is BB sectional view of FIG. It is sectional drawing which shows the state which the bellows part interfere with a resonator in the hose resonator connection structure of the comparative example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The shapes, materials, and numbers described below are examples for explanation and can be appropriately changed according to the specifications of the hose resonator connection structure and the like. In the following, the equivalent elements will be described with the same reference numerals in all the drawings. In addition, in the explanation in the text, the reference numerals described earlier shall be used as necessary.

FIG. 1 is a perspective view of the hose resonator connection structure 10 of the embodiment as viewed from above. FIG. 2 is a view taken along the arrow A of FIG. FIG. 3 is a cross-sectional view taken along the line BB of FIG.

The hose resonator connecting structure 10 is formed by connecting the air cleaner hose 12 and the resonator 30. The hose resonator connection structure 10 is arranged in the engine room on the front side of the vehicle, and the air cleaner hose 12 is connected between the intake manifold of the engine (not shown) and the air cleaner (not shown). Hereinafter, the air cleaner hose 12 will be referred to as a hose 12.

The hose 12 has a cylindrical shape with both ends in the longitudinal direction open, and both ends in the longitudinal direction are slightly bent to the same side so that the hose 12 has a substantially U-shape as a whole with the intermediate portion in the longitudinal direction extending linearly. The hose 12 is formed of a resin material, rubber, or the like into a shape including a tubular hose body 13 and a connecting tubular portion 25. The connecting cylinder portion 25 is formed so as to project radially outward from a portion of the circumferential middle portion of the hose body 13 in the longitudinal direction. In the connection cylinder portion 25, a large diameter portion 26 is formed on the root side portion on the hose body 13 side, and a small diameter portion 27 having a smaller diameter than the large diameter portion 26 is formed on the tip side portion, and the small diameter portion 27 and the large diameter portion 27 are formed. A step portion 28 is arranged between the diameter portion 26 and the diameter portion 26.

One end in the longitudinal direction of the hose 12 (the right end in FIGS. 1 to 3) is connected to an air cleaner (not shown). The other end of the hose 12 in the longitudinal direction (the left end of FIGS. 1 to 3) is connected to an engine (not shown).

The hose 12 has a first opening 29 (FIG. 3), a bellows portion 17, and a first hose 12 on the outer peripheral surface of the intermediate portion in the longitudinal direction in order from the other end side in the longitudinal direction (left side in FIGS. 1 to 3). 1 Contact portion 19 is formed. The first opening 29 is formed inside the connecting cylinder 25. The locking cylinder portion 31 of the resonator 30, which will be described later, is inserted into and connected to the first opening portion 29.

The first contact portion 19 is formed on the outer peripheral surface of the hose body 13 on the side opposite to the first opening 29 with the bellows portion 17 interposed therebetween, and is radially outward from the outer peripheral surface of the hose body 13. It is a tip surface of a conical stand-shaped protrusion 18 projecting in the same direction as the connection cylinder portion 25.

Further, of the hose 12, the longitudinal intermediate portion including the first opening 29, the bellows portion 17, and the first contact portion 19 with the hose shaft O1 (FIG. 3) as the central axis is linear in a steady state. It is growing to. Here, the steady state is a state in which vibration such as engine vibration and external force are not applied to the hose 12.

The resonator 30 is a sound deadening unit, and has a substantially rectangular parallelepiped box shape as a whole. The resonator 30 is made of a resin material. For example, the resonator 30 has a structure of two splits, and is formed by connecting the first element A1 on the hose 12 side and the second element A2 on the opposite side of the hose 12. Each of the first and second elements A1 and A2 has a shallow box shape with a substantially rectangular opening. The resonator 30 is formed by connecting the opening peripheral portions of the first and second elements A1 and A2.

Further, the resonator 30 includes a locking cylinder portion 31, a second contact portion 33, and a body portion 35. The locking cylinder portion 31 is formed so as to project toward the hose 12 from one end in the longitudinal direction (left end in FIGS. 1 and 3) of the side surface of the resonator 30 facing the hose 12. The locking cylinder portion 31 has a cylindrical shape, and a flange portion 31a protruding outward in the radial direction is formed on the outer peripheral surface of the tip portion. A second opening 31b is formed inside the locking cylinder 31. When the locking cylinder portion 31 is connected to the connection cylinder portion 25 of the hose 12 as described later, the flange portion 31a is locked to the step portion 28 of the connection cylinder portion 25.

The second contact portion 33 is the tip surface of a conical stand-shaped protrusion 32 protruding toward the hose 12 from the other end in the longitudinal direction (right end in FIGS. 1 and 2) of the side surface of the resonator 30 facing the hose 12. Is. The inside of the second contact portion 33 is hollow and forms a part of the sound deadening space of the resonator 30.

The body portion 35 of the resonator 30 is a tubular portion arranged between the locking tubular portion 31 and the second contact portion 33 in the longitudinal direction of the resonator 30.

Further, as shown in FIGS. 1 and 2, at one end in the longitudinal direction of the resonator 30 (the left end in FIGS. 1 and 2), the PCV cylinder 36 (the PCV cylinder 36 (the left end in FIGS. 1 and 2) is orthogonal to the locking cylinder 31. 1 and 2) are prominent. The PCV cylinder portion 36 communicates with the internal space of the resonator 30. The PCV cylinder 36 is connected to a PCV valve (not shown) attached to the head cover of the engine (not shown) via a PCV hose (not shown). By operating the PCV valve, for example, it is possible to reduce the internal pressure in the engine and return the exhaust blow-by gas to the intake system.

The resonator 30 is connected to the hose 12 by connecting the locking cylinder portion 31 of the resonator 30 to the connecting cylinder portion 25 of the hose 12. At this time, the first opening 29 of the hose 12 is connected to the second opening 31b of the resonator 30. In this state, the second contact portion 33 faces the first contact portion 19. At this time, in the steady state, the second contact portion 33 comes into contact with the first contact portion 19, but a gap may be formed between the second contact portion 33 and the first contact portion 19. ..

Further, in this state, a gap d (FIG. 3) is formed between the bellows portion 17 of the hose 12 and the side surface of the resonator 30 facing the bellows portion 17. Therefore, in the hose resonator connection structure 10, the dimensions of each part are regulated as follows.

First, in the hose 12, a state in which a longitudinal intermediate portion including a first opening 29, a bellows portion 17, and a first contact portion 19 and a linear hose shaft O1 as a central axis extends linearly. A predetermined shaft in the resonator 30 parallel to the hose shaft O1 is referred to as a resonator shaft O2 (FIG. 3).

Then, the first distance D1 from the hose shaft O1 to the outer peripheral position of the arbitrary bellows portion 17 in the direction from the hose shaft O1 toward the body portion 35 of the resonator 30, and the direction from the resonator shaft O2 toward the bellows portion 17 A second distance D2 from the resonator shaft O2 to the body portion 35 facing the outer peripheral position of the bellows portion 17 is defined. Further, in the direction from the hose shaft O1 to the second contact portion 33, the third distance D3 from the hose shaft O1 to the first contact portion 19, and in the direction from the resonator shaft O2 to the first contact portion 19. A fourth distance D4 from the resonator shaft O2 to the second contact portion 33 is defined. Then, the sum (D1 + D2) of the first distance D1 and the second distance D2 is regulated to be shorter than the sum (D3 + D4) of the third distance D3 and the fourth distance D4 {(D1 + D2) <(D3 + D4)}. ..

According to the hose resonator connection structure 10 described above, the relationship between the first distance D1, the second distance D2, the third distance D3, and the fourth distance D4 is regulated as described above. As a result, the first contact portion 19 of the hose 12 and the second contact portion 33 of the resonator 30 come into contact with each other, so that the contact between the bellows portion 17 and the resonator 30 is avoided. This makes it possible to increase the size of the resonator 30 while avoiding interference between the bellows portion 17 and the resonator 30. By increasing the size of the resonator 30, the capacity of the resonator 30 can be increased and the sound deadening performance can be improved. Therefore, it can contribute to the noise reduction of the vehicle. Further, the first contact portion 19 of the hose 12 and the second contact portion 33 of the resonator 30 have a function as a stopper for preventing the resonator 30 from interfering with the bellows portion 17. Further, since the first contact portion 19 and the second contact portion 33 are not coupled, it is possible to suppress a decrease in the motion absorption performance of the hose 12, which is a function of the bellows portion 17.

FIG. 4 is a cross-sectional view showing a state in which the bellows portion 17 interferes with the resonator 30a in the hose resonator connection structure 10a of the comparative example. In this comparative example, the hose 12a and the resonator 30a are connected by connecting the first connection cylinder portion 40 formed on the hose 12a and the second connection cylinder portion 42 formed on the resonator 30a. Further, in the comparative example, the bellows portion of the hose 12a faces the side surface of the resonator 30a. Further, one end (right end in FIG. 4) of the bellows portion 17 opposite to the first connection cylinder portion 40 protrudes outward from one end (right end in FIG. 4) opposite to the second connection cylinder portion 42 of the resonator 30a. There is. Further, in the hose 12a, a contact portion facing the resonator 30a is not formed on the side opposite to the first connecting cylinder portion 40 via the bellows portion 17. The one end side portion (right end side portion in FIG. 4) of the hose 12a extends linearly with the one-dot chain line E1 in FIG. 4 as the central axis in a steady state. On the other hand, when engine vibration or an external force is applied, the one end side portion may bend toward the resonator 30a so as to have the alternate long and short dash line E2 in FIG. 4 as the central axis.

In such a comparative example, as shown by the portion surrounded by the alternate long and short dash line frame C in FIG. 4, when the hose 12a bends toward the resonator 30a, the bellows portion 17 interferes with the resonator 30a and comes into contact with the hose. As a result, the bellows portion 17 may be deformed so as to be crushed. On the other hand, in the comparative example, it is also conceivable to increase the distance between the bellows portion 17 and the resonator 30a to prevent interference between the bellows portion 17 and the resonator 30a. However, in recent years, the number of parts in the engine room has increased, and in order to improve the pedestrian protection performance, there is a tendency to increase the distance between the lower side surface of the bonnet (not shown) and the parts. As a result, there are many problems in increasing the distance between the bellows portion 17 and the resonator 30a. In the above embodiment, such inconvenience can be prevented.

In the embodiment shown in FIGS. 1 to 3 above, the case where one end in the longitudinal direction of the resonator 30 on the engine side (the left end in FIGS. 1 to 3) is connected to the hose 12 by the connecting cylinder 25 is used. explained. On the other hand, a connection cylinder portion may be formed at the other end in the longitudinal direction (right end portion in FIGS. 1 to 3) of the resonator on the air cleaner side, and the resonator may be connected to the hose 12 by the connection cylinder portion.

Further, the first contact portion and the second contact portion are not limited to the case where the tip surface of the protrusion is used as described above, and for example, one of the first contact portion and the second contact portion is the other. It may be a flat surface portion located on the same plane as the portion of.

10,10a hose resonator connection structure, 12,12a air cleaner hose (hose), 13 hose body, 17 bellows part, 18 protrusions, 19 first contact part, 25 connection cylinder part, 26 large diameter part, 27 small diameter part, 28 Stepped part, 29 1st opening, 30,30a resonator, 31 locking cylinder, 31a flange, 31b 2nd opening, 32 protrusion, 33 2nd contact, 35 body, 36 PCV cylinder Unit, 40 1st connection cylinder part, 42 2nd connection cylinder part.

Claims (3)

A hose in which a first opening, a bellows portion, and a first contact portion are sequentially formed in the longitudinal direction on the outer peripheral surface of the intermediate portion in the longitudinal direction.
The body includes a second opening connected to the first opening, a second contact portion facing the first contact portion, and a body portion, and the body portion is the second opening portion and the second contact portion. Equipped with a resonator placed between the parts,
In the hose, the first opening portion, the bellows portion, and the first contact portion are included, and the longitudinal intermediate portion with the hose shaft as the central axis extends linearly and is parallel to the hose shaft. , When the predetermined axis in the resonator is used as the resonator axis,
The sum of the first distance from the hose shaft to an arbitrary outer peripheral position of the bellows and the second distance from the resonator shaft to the body facing the outer peripheral position of the bellows is the first from the hose shaft. It is shorter than the sum of the third distance to the contact portion and the fourth distance from the resonator shaft to the second contact portion.
Hose resonator connection structure. In the hose resonator connection structure according to claim 1,
The first contact portion is formed between one end of the air cleaner connection side and the bellows portion in the longitudinal direction of the hose.
Hose resonator connection structure. In the hose resonator connection structure according to claim 1 or 2.
The first contact portion is a tip surface of a protrusion protruding from a part of the outer peripheral surface of the hose in the circumferential direction.
Hose resonator connection structure.

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