JP2631167B2 - Engine intake system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIG. 4 shows a prior art of an intake system for an engine. This is achieved by providing a plurality of pipe fitting cylinders 102 in an intake manifold 101,
02, the distal end of the elastic intake pipe 103 is fitted around a predetermined pipe fitting cylinder 102, and a band 104 is formed along the outer peripheral surface of the distal end of the intake pipe 103.
And the front end of the intake air introduction pipe 103 is tightly fixed to the pipe fitting cylinder 102 by the tightening force of the band 104. Further, among the plurality of pipe fitting cylinders 102, the pipe fitting cylinder 102 in which the tip end of the intake introduction pipe 103 is not fitted inside 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 a pipe fitting cylinder 102 through which the intake pipe 103 is easily piped from an air cleaner (not shown), and connect the tip end of the intake pipe 103 to this pipe.

[0004]

The above prior art has the following problems. Intake inlet pipe 1 having elasticity in pipe fitting cylinder 102
03, the band 104 is fitted around the outer peripheral surface of the distal end of the intake pipe 103, and the distal end of the intake pipe 103 is connected to the pipe fitting tube by the tightening force of the band 104. Because it is tightly connected to a plurality of pipe fitting cylinders 102 from the surface of the intake manifold 101,
Must be protruded, and the outer shape of the intake manifold 101 becomes large.

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

[0006] The pipe fitting cylinder 102 in which the end of the intake pipe 103 is not fitted is sealed with a metal plate sealing lid 106 fixed with bolts 105, so that the sealing operation is complicated. .

[0007] It is an object of the present invention to reduce the outer shape of the intake manifold and to simplify the work of connecting the intake pipe.

[0008]

(First invention) In a first invention, as illustrated in FIG. 1, a plurality of pipe fitting holes 2 are formed in an intake manifold 1 and an inner peripheral surface of the pipe fitting hole 2 is formed. An annular groove 3 is provided around the plurality of pipe fitting holes 2.
Intake intake pipe 4 having elasticity in predetermined pipe insertion hole 2
Is fitted inside, and a pipe ridge 5 provided around the outer peripheral surface of the leading end of the intake pipe 4 is fitted into the annular groove 3.

(Second Invention) According to a second invention, as shown in FIG. 1C, in the first invention, a retaining ring 6 is fitted inside an inner peripheral surface of a tip end portion of the intake pipe 4. The elasticity of the retaining ring 6 presses the pipe ridge 5 against the annular groove 3.

(Third Invention) According to a third invention, as illustrated in FIG. 1 (D), in the first invention or the second invention, a tip of the suction inlet pipe 4 among the plurality of pipe fitting holes 2 is provided. A resilient bowl-shaped sealing plug 7 is fitted in the pipe fitting hole 2 in which the portion is not fitted, and the sealing plug ridge 9 provided around the outer peripheral surface of the sealing plug 7 is inserted into the annular groove. 3 is fitted.

(Fourth invention) In a fourth invention, as illustrated in FIG. 1D, in the third invention, an annular band 10 is fitted along the inner peripheral surface of the sealing plug 7, This band 1
The sealing plug ridge 9 is pressed against the annular groove 3 with an elasticity of 0.

[0012]

(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. Among them, a tip portion of an elastic intake pipe 4 is fitted in a predetermined pipe fitting hole 2, and a pipe ridge 5 is provided around an outer peripheral surface of the tip section of the intake pipe 4.
Is fitted in the annular groove 3, there is no large protrusion from the surface of the intake manifold 1, and the intake manifold 1 can be downsized.

By merely fitting the tip of the intake pipe 4 into the pipe fitting hole 2, the pipe ridge 5 naturally fits into the annular groove 3, and the intake pipe 4 is prevented from coming off. Can be easily connected.

(Second Invention) The second invention has the following effects in addition to the effects of the first invention. A retaining ring 6 extends along the inner peripheral surface of the distal end portion of the intake introduction pipe 4.
And the elasticity of the retaining ring 6 presses the pipe ridge 5 against the annular groove 3, so that the suction pipe 4 is securely prevented from coming off, and the suction pipe 4 is surely prevented from coming off accidentally. 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, an elastic bowl-shaped sealing plug 7 is fitted inside the pipe fitting hole 2 in which the tip end portion of the intake introduction pipe 4 is not fitted. Since the sealing plug ridges 9 provided around the surface are fitted into the annular groove 3, the sealing plug ridges 9 are simply inserted into the pipe fitting holes 2.
Naturally fits into the annular groove 3 and the sealing plug 7 is prevented from coming off, so that the work of sealing the intake pipe 4 can be easily performed.

(Fourth invention) The fourth invention has the following effects in addition to the effects of the third invention or. An annular band 10 was fitted inside the inner peripheral surface of the sealing plug 7, and the elasticity of the band 10 pressed the sealing plug ridge 9 against the annular groove 3. It is done firmly,
The accidental removal of the sealing plug 7 can be reliably prevented.

[0017]

An embodiment 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,
1 (B) is a side view of the intake manifold, FIG. 1 (C) is a longitudinal sectional view of a connection portion of the intake pipe, FIG. 1 (D) is a longitudinal sectional view of a sealing plug attaching portion, and FIG. It is a perspective view of a band.

In FIGS. 1A and 1B, reference numeral 1 denotes 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 ends and a front surface 2 at both ends of a main pipe 11.
Pipe fitting holes 2 are made at a total of four locations. FIG.
As shown in (C) and (D), an annular groove 3 is provided on the inner peripheral surface of each pipe fitting hole 2. As shown in FIG. 1 (A), of the plurality of pipe fitting holes 2, the distal end portion of a rubber-made intake pipe 4 is fitted inside the pipe insertion hole 2 on one end side of the main pipe 11. As shown in FIG. 1 (C), a pipe ridge 5 is provided around the outer peripheral surface of the tip of the intake pipe 4, and the pipe ridge 5 is fitted into the annular groove 3. A retaining ring 6 is fitted inside the inner peripheral surface of the distal end portion of the intake pipe 4, and the elasticity of the retaining ring 6 presses the pipe ridge 5 against the annular groove 3.

As shown in FIG. 1 (A), a rubber bowl-shaped seal is inserted into each of the plurality of pipe insertion holes 2 in which the distal end of the intake pipe 4 is not fitted. The stopper 7 is fitted inside. As shown in FIG. 1 (D), a sealing plug ridge 9 is provided around the outer peripheral surface of the sealing plug 7, and the sealing plug ridge 9 is fitted into the annular groove 3. An annular band 10 shown in FIG. 1E 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. Band 10 is formed of spring steel.

FIG. 2 is a view for explaining a modification of the band. FIG. 2 (A) is a perspective view of the band, and FIG. 2 (B) is an explanatory view of a band tension adjusting mechanism. Specifically, a worm gear 14 and a pair of bevel gears 15 and 16 are provided inside a gear case 13 fixed to one end of a band 10, and one bevel gear 1
5 is provided with an adjustment knob 17, the other bevel gear 16 is fixed to the shaft 18 of the worm gear 14, and the rack teeth 1 meshing with the worm gear 14 are provided on one surface of the other end of the band 10.
9, the other end of the band 10 is inserted into the gear case 13, and the tension of the band 10 can be adjusted by expansion and contraction of the ring of the band 10 by the worm gear 14.

FIG. 3 is a view for explaining an intake system for an engine according to a second embodiment of the present invention. FIG. 3 (A) is a longitudinal sectional view of a portion where an intake pipe is connected, and FIG. 3 (B) is a sealing plug. It is a longitudinal section of an attachment part.

In this embodiment, as shown in FIG. 3A, the inner peripheral surface of the pipe fitting hole 2 is formed in a tapered shape whose diameter is reduced toward the back side, and a rubber-made intake introducing pipe 4 is formed.
The outer peripheral surface of the distal end of the intake pipe 4 is also formed in a similar tapered shape, and the distal end of the intake pipe 4 is fitted inside the pipe fitting hole 2. As shown in FIG. 3 (B), the outer peripheral surface of a rubber-made bowl-shaped sealing plug 7 is formed into a tapered shape, and the sealing plug 7 is fitted with the distal end of the intake pipe 4. Not fitted in each pipe fitting hole 2. A metal disk 20 for reinforcement is embedded in the back end surface of the sealing plug 7.

Although the contents of each embodiment of the present invention are as described above, the present invention is not limited to the above embodiments.
For example, the number of pipe ridges 5 of the intake introduction pipe 4 is not limited to one, and a plurality of ridges 5 may be provided, and a retaining ring 6 may be provided inside each of the ridges.

[Brief description of 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.
(C) is a vertical cross-sectional view of the connection part of the intake pipe, FIG.
(D) is a longitudinal sectional view of a sealing plug attaching portion, and FIG. 1 (E) is a perspective view of a band.

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

FIG. 3 is a view for explaining an intake device for an engine according to a second embodiment of the present invention. FIG. 1 (A) is a longitudinal sectional view of a portion where an intake pipe is connected, and FIG. It is a longitudinal section of a plug attachment part.

FIG. 4 is a view for explaining an intake device for an engine according to the prior art. FIG. 4 (A) is a front view of an intake manifold, FIG. 4 (B) is a side view of the intake manifold, and FIG. 4 (C). FIG. 4D is a vertical cross-sectional view of a connection portion of the intake introduction pipe, and FIG. 4D is a vertical cross-sectional view of a sealing plug attachment portion.

[Explanation of symbols]

1 ... intake manifold, 2 ... pipe fitting hole, 3 ... annular groove,
4 ... intake pipe, 5 ... pipe convex, 6 ... retaining ring, 7
... sealing plug, 9 ... convexity of sealing plug, 10 ... band.

Claims (4)

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