JPH0552155A - Intake device for engine - Google Patents

Abstract

PURPOSE:To facilitate miniaturization and connecting work by providing a pipe fitting hole drilled in an intake manifold, internally fitting an intake air introducing pipe to the pipe fitting hole while further peripherally providing an annular groove in an internal peripheral surface of the pipe fitting hole, and fitting this pipe protrusive streak to the annular groove. CONSTITUTION:In an intake manifold 1 for a three-cylinder engine, three branch pipes 12 are branched from a master pipe 11. Here, a pipe fitting hole 2 is drilled respectively in a total of four parts, both end two parts and front face two parts of the master pipe 11. Respective annular grooves 3 are circumferentially provided in an internal peripheral surface of each pipe fitting hole 2. A point end part of an intake air introducing pipe 4 is internally fitted to the pipe fitting hole 2 in one end side of the master pipe 11. Here, a pipe protrusive streak 5 is circumferentially provided in a peripheral surface in the point end part of the intake air introducing pipe 4, fitted to the annular groove 3 and pressed by a stop ring 6. On the other hand, a seal plug 7 is internally fitted to the pipe fitting hole 2 not internally fitted with the intake air introducing pipe 4, and a seal wire protrusive streak 9 circumferentially provided in a peripheral surface of this seal plug is fitted to the annular groove 3 and pressed by a band 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine intake system.

[0002]

2. Description of the Related Art As a conventional engine intake system for an engine, there is one shown in FIG. This is because the intake manifold 101 is provided with a plurality of pipe fitting cylinders 102, and the pipe fitting cylinders 1
02, the end portion of the intake air intake pipe 103 having elasticity is externally fitted to a predetermined pipe fitting cylinder 102, and the band 104 is formed along the outer peripheral surface of the front end portion of the intake air intake pipe 103.
Is externally fitted, and the distal end portion of the intake introduction pipe 103 is tightly fixed to the pipe fitting cylinder 102 by the tightening force of the band 104. Of the plurality of pipe fitting cylinders 102, the pipe fitting cylinder 102 in which the tip of the intake air introduction pipe 103 is not fitted is sealed with a metal plate sealing lid 106 fixed with bolts 105. is there.

According to such a configuration, it is possible to select the pipe fitting cylinder 102 in which the intake air introducing pipe 103 is easily piped from the air cleaner (not shown), and connect the tip end portion of the intake air introducing pipe 103 to this.

[0004]

The above-mentioned prior art has the following problems. Intake introduction pipe 1 having elasticity in the pipe fitting cylinder 102
03, the tip end portion of 03 is externally fitted, and the band 104 is externally fitted along the outer peripheral surface of the tip portion of the intake air introduction pipe 103. Since it is tightly connected to the pipe 102, a plurality of pipe fitting cylinders 102 are attached to the surface of the intake manifold 101.
Must be projected, and the outer shape of the intake manifold 101 becomes large.

In connecting the tip of the intake introducing pipe 103 to the intake manifold 101, it is necessary to fit the tip of the intake introducing pipe 103 into the pipe fitting cylinder 102 and then tighten the band 104. Is complicated.

The pipe fitting cylinder 102, in which the tip of the intake air introduction pipe 103 is not fitted inside, is sealed with a metal plate sealing lid 106 fixed with bolts 105, so the sealing work is complicated. ..

The object of the present invention is to make the outer shape of the intake manifold small and to easily connect the intake introduction pipe.

[0008]

(First Invention) As shown in FIG. 1, a first invention is to form a plurality of pipe fitting holes 2 in an intake manifold 1 and to form an inner peripheral surface of the pipe fitting hole 2. An annular groove 3 is provided around the pipe fitting holes 2 among the plurality of pipe fitting holes 2.
Intake intake pipe 4 having elasticity in a predetermined pipe fitting hole 2
The inner end of the pipe is fitted in, and the pipe ridge 5 provided around the outer peripheral surface of the end of the intake introduction pipe 4 is fitted in the annular groove 3.

(Second Invention) As shown in FIG. 1 (C), the second invention is such that, in the first invention, a retaining ring 6 is internally fitted along the inner peripheral surface of the distal end portion of the intake introduction pipe 4. The elasticity of the retaining ring 6 presses the pipe ridge 5 against the annular groove 3.

(Third Invention) As shown in FIG. 1D, the third invention is the first or second invention, wherein the tip of the intake introduction pipe 4 of the plurality of pipe fitting holes 2 is provided. A bowl-shaped sealing plug 7 having elasticity is fitted into the pipe fitting hole 2 whose portion is not fitted therein, and the sealing plug projection 9 provided around the outer peripheral surface of the sealing plug 7 is provided in the annular groove. It is characterized in that it is fitted in 3.

(Fourth Invention) As shown in FIG. 1 (D), the fourth invention is such that, in the third invention, an annular band 10 is fitted along the inner peripheral surface of the sealing plug 7, This band 1
It is characterized in that the sealing plug ridge 9 is pressed against the annular groove 3 with an elasticity of 0.

[0012]

(Advantageous Effects of the Invention) (First Invention) A plurality of pipe fitting holes 2 are formed in the intake manifold 1, and an annular groove 3 is provided on the inner peripheral surface of the pipe fitting hole 2 to form a plurality of pipe fitting holes 2. Of these, a pipe projection 5 formed by fitting the tip portion of an intake air intake pipe 4 having elasticity into a predetermined pipe insertion hole 2 and surrounding the outer peripheral surface of the tip end portion of the intake air intake pipe 4
Since it is fitted into the annular groove 3, there is no large protruding portion from the surface of the intake manifold 1, and the intake manifold 1 can be downsized.

By simply fitting the tip of the intake air introducing pipe 4 into the pipe fitting hole 2, the pipe ridge 5 is naturally fitted in the annular groove 3 and the intake air introducing pipe 4 is prevented from coming off. Connection work can be done easily.

(Second Invention) In addition to the effects of the first invention, the second invention has the following effects. A retaining ring 6 is provided along the inner peripheral surface of the tip of the intake air introduction pipe 4.
Since the pipe projection 5 is pressed against the annular groove 3 by the elasticity of the retaining ring 6, the intake introduction pipe 4 is firmly prevented from coming off, and the intake introduction pipe 4 is reliably removed by accident. It can be prevented.

(Third Invention) The third invention has the following effects in addition to the effects of the first invention and / or the effects of the second invention. Out of the plurality of pipe fitting holes 2, a bowl-shaped sealing plug 7 having elasticity is fitted into the pipe fitting hole 2 in which the tip of the intake air introduction pipe 4 is not fitted, and the outer periphery of the sealing plug 7 Since the sealing plug ridge 9 circumferentially provided on the surface is fitted into the annular groove 3, the sealing plug ridge 9 can be simply inserted into the pipe fitting hole 2.
Is naturally fitted into the annular groove 3 and the sealing plug 7 is prevented from coming off, so that the work of sealing the intake air introduction pipe 4 can be easily performed.

(Fourth Invention) The fourth invention has the following effects in addition to the effects of the third invention. Since the ring-shaped band 10 is fitted inside along the inner peripheral surface of the sealing plug 7 and the elasticity of the band 10 presses the sealing plug ridge 9 into the annular groove 3, the sealing plug 7 is prevented from coming off. Done firmly,
It is possible to reliably prevent the accidental removal of the sealing plug 7.

[0017]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a view for explaining an intake device for an engine according to a first embodiment of the present invention, FIG. 1 (A) is a front view of an intake manifold,
FIG. 1 (B) is a side view of the intake manifold, FIG. 1 (C) is a vertical cross-sectional view of the intake introduction pipe connecting portion, FIG. 1 (D) is a vertical cross-sectional view of the sealing plug attaching portion, and FIG. It is a perspective view of a band.

In FIGS. 1 (A) and 1 (B), reference numeral 1 indicates an intake manifold for a three-cylinder engine, which is obtained by branching three branch pipes 12 from a main pipe 11.
This intake manifold 1 has two main pipes 11 at both ends and a front face 2
Pipe fitting holes 2 are formed at a total of four places. Figure 1
As shown in (C) and (D), an annular groove 3 is provided around the inner peripheral surface of each pipe fitting hole 2. As shown in FIG. 1 (A), of the plurality of pipe fitting holes 2, a tip end portion of a rubber intake pipe 4 is fitted in the pipe insertion hole 2 on one end side of the parent pipe 11. As shown in FIG. 1C, a pipe ridge 5 is provided around the outer peripheral surface of the tip of the intake air introduction pipe 4, and the pipe ridge 5 is fitted into the annular groove 3. A retaining ring 6 is fitted inside along the inner peripheral surface of the tip of the intake air introducing pipe 4, and the elasticity of this retaining ring 6 presses the pipe ridge 5 against the annular groove 3.

Further, as shown in FIG. 1 (A), of the plurality of pipe insertion holes 2, a rubber-made bowl-shaped sealing is made in each pipe insertion hole 2 in which the tip of the intake air introduction pipe 4 is not fitted. The stopper 7 is fitted inside. As shown in FIG. 1D, a sealing plug convex strip 9 is provided around the outer peripheral surface of the sealing plug 7, and the sealing plug convex strip 9 is fitted into the annular groove 3. An annular band 10 shown in FIG. 1 (E) is fitted along the inner peripheral surface of the sealing plug 7,
The elasticity of the band 10 presses the sealing plug ridge 9 against the annular groove 3. The band 10 is made of spring steel.

2A and 2B are views for explaining an example of changing the band, FIG. 2A is a perspective view of the band, and FIG. 2B is an explanatory view of a band tension adjusting mechanism. In this case, a worm gear 14 and a pair of bevel gears 15 and 16 are internally provided in a gear case 13 fixed to one end of a band 10, and one bevel gear 1
5 is provided with an adjusting knob 17, the other bevel gear 16 is fixed to the shaft 18 of the worm gear 14, and the rack tooth 1 that meshes with the worm gear 14 is attached to one surface of the other end side portion of the band 10.
9, the other end portion of the band 10 is inserted into the gear case 13, and the tension of the band 10 can be adjusted by expanding and contracting the ring of the band 10 by the worm gear 14.

3A and 3B are views for explaining an intake device for an engine according to a second embodiment of the present invention. FIG. 3A is a vertical cross-sectional view of the intake introducing pipe connecting portion, and FIG. 3B is a sealing plug. It is a longitudinal cross-sectional view of a mounting portion.

In this embodiment, as shown in FIG. 3 (A), the inner peripheral surface of the pipe fitting hole 2 is formed into a taper shape whose diameter decreases toward the inner side, and the rubber intake pipe 4 is provided.
The outer peripheral surface of the tip portion of is also formed in the same taper shape, and the tip portion of the intake introduction pipe 4 is fitted in the pipe fitting hole 2. Further, as shown in FIG. 3 (B), the outer peripheral surface of the rubber-made bowl-shaped sealing plug 7 is formed into a taper shape, and the distal end portion of the intake air introducing pipe 4 is fitted into this sealing plug 7. It is internally fitted in each pipe fitting hole 2 which is not provided. A metal disc 20 for reinforcement is embedded in the back end surface of the sealing plug 7.

The contents of the respective embodiments of the present invention are as described above, but the present invention is not limited to the above embodiments.
For example, the pipe convex line 5 of the intake air introduction pipe 4 is not limited to one line, and a plurality of lines may be provided, and the retaining ring 6 may be provided inside each of them.

[Brief description of drawings]

1A and 1B are views for explaining an intake system for an engine according to a first embodiment of the present invention, FIG. 1A is a front view of an intake manifold, and FIG. 1B is a side view of the intake manifold. Figure 1
FIG. 1 (C) is a vertical cross-sectional view of the intake introduction pipe connecting portion,
FIG. 1D is a vertical cross-sectional view of the sealing plug attachment portion, and FIG. 1E is a perspective view of the band.

FIG. 2 is a diagram for explaining an example of changing bands.
FIG. 2A is a perspective view of a band, and FIG. 2B is an explanatory view of a band tension adjusting mechanism.

FIG. 3 is a view for explaining an engine air intake device according to a second embodiment of the present invention, FIG. 1 (A) is a vertical cross-sectional view of an intake air intake pipe connecting portion, and FIG. 1 (B) is a seal. It is a longitudinal cross-sectional view of a plug attachment portion.

4A and 4B are views for explaining an intake device for an engine according to a conventional technique. FIG. 4A is a front view of an intake manifold, FIG. 4B is a side view of the intake manifold, and FIG. 4D is a vertical cross-sectional view of the intake introduction pipe connection portion, and FIG. 4D is a vertical cross-sectional view of the sealing plug attachment portion.

[Explanation of symbols]

1 ... Intake manifold, 2 ... Pipe fitting hole, 3 ... Annular groove,
4 ... intake introduction pipe, 5 ... pipe convex shape, 6 ... snap ring, 7
... sealing plug, 9 ... sealing plug ridge, 10 ... band.

Claims (4)

[Claims] 1. A plurality of pipe fitting holes (2) are formed in the intake manifold (1), and an annular groove is formed on the inner peripheral surface of the pipe fitting holes (2).
(3) is provided around the pipe, and an intake pipe having elasticity in a predetermined pipe fitting hole (2) among the plurality of pipe fitting holes (2).
The tip end of (4) is fitted inside, and the pipe ridge (5) provided around the outer peripheral surface of the tip end of this intake introduction pipe (4) is provided with the annular groove.
An intake device for an engine, which is fitted in (3). 2. The engine intake system according to claim 1, wherein a retaining ring (6) is fitted along the inner peripheral surface of the tip of the intake introducing pipe (4), and the retaining ring (6) is fitted. The intake device for an engine, characterized in that the pipe ridge (5) is pressed against the annular groove (3) by the elasticity of. 3. The intake system for an engine according to claim 1 or 2, wherein the tip of the intake introduction pipe (4) is not fitted inside the plurality of pipe fitting holes (2). Bowl-shaped sealing plug (7) with elasticity in the insertion hole (2)
An air intake device for an engine, characterized in that a sealing plug ridge (9) provided around the outer peripheral surface of the sealing plug (7) is fitted into the annular groove (3). 4. The engine intake system according to claim 3, wherein an annular band is provided along the inner peripheral surface of the sealing plug (7).
An engine air intake device, characterized in that (10) is fitted inside, and the elasticity of the band (10) presses the sealing plug ridge (9) into the annular groove (3).