JP3432931B2 - Exhaust silencer for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention
On the side that receives exhaust pressure and increases flow resistance
A biased valve element is operably stored within the valve housing.
Flow control valve is formed in the muffler shell.
Inner pad connecting two muffler rooms out of multiple muffler rooms
For exhaust muffler of internal combustion engine attached to the exit side of Ip
Related. [0002] 2. Description of the Related Art Conventionally, such an apparatus is disclosed in, for example,
This is already known from, for example, JP-A-221130. [0003] SUMMARY OF THE INVENTION
The flow control valve is located inside the pipe-shaped valve housing.
With a butterfly-type valve body rotatably housed in it
If the operating position of the valve element, that is, the rotation angle, is determined,
The resistance is uniquely determined, and the resistance to exhaust pressure
The degree of freedom in setting the amount of distribution is relatively small. [0004] The present invention has been made in view of such circumstances.
Therefore, the ratio of the flow resistance to the exhaust pressure of the flow control valve is
Exhaust silencer for internal combustion engine which can be set relatively freely
The purpose is to provide a device. [0005] [MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In the present invention, the exhaust pressure is applied to the side where the flow resistance becomes smaller.
With a spring biased to the side that increases the flow area
Is operatively housed in the valve housing
A regulating valve is provided in a plurality of silencers formed in the shell of the silencer
On the exit side of the inner pipe connecting between the two mufflers
In an exhaust silencer for an internal combustion engine to be mounted,Inner
-Formed separately from the pipe and supported by the silencer shell
Inside the valve housingBetween the valve housing
The inflow chamberWith formingTheOuter edge on inner surface of valve housing
The valve body, which is close to the valve, minimizes the volume of the inflow chamber.
Between the position and the position that maximizes the volume of the inflow chamber.
PossibleEarnDelivered to the valve housingInflow chamber at inner end
And the inner end opening is opposed to the valve
With the end protruding out of the valve housing and the outer end opening
An inlet pipe fitted to the outlet end of the pipe is fixed and
The valve housing hasStations set within the operating range of the valve
Depending on the actuation of the valve body from the flow start point to the inflow chamber volume increase side
Exit window that gradually increases the area facing the inflow chamber
It is characterized by that. [0006] According to the structure of the present invention, the valve element has a volume of the inflow chamber.
During the operation from the position where is minimized to the communication start point,
Flowed into the inflow chamber from the inner pipe via the inlet pipe
Exhaust air passes through the gap between the inner surface of the valve housing and the outer edge of the valve body.
Through the exit window, and the valve element
From the position to the position that maximizes the volume of the inflow chamber
Means that the exhaust gas flows directly from the inflow chamber to the exit window.
You. Thus, communication starts at any position within the operating range of the valve.
Depending on whether you decideSeparate from the inner pipe
In the valve housingHow to determine the shape of the exit window
The flow resistance according to the operating position of the valve element, that is,
The circulation amount can be set arbitrarily. [0007] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
explain. FIGS. 1 to 8 show an embodiment of the present invention.
FIG. 1 is a plan view of a silencer, and FIG.
FIG. 3 is an enlarged sectional view of the muffler taken along line 3-3 of FIG.
FIG. 4 is a longitudinal sectional view of the silencer taken along line 4-4 in FIG.
FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. 4, and FIG.
7 is a sectional view taken along line 7-7 of FIG. 6, and FIG.
FIG. 8 is a sectional view taken along line 8-8 of FIG. First, referring to FIG. 1 to FIG.
The shell 12 of the silencer 11 provided in the middle of the exhaust system is a cylinder
And one end wall 12a of the shell 12
Single exhaust introduction to direct exhaust from engine body (not shown)
A tube 13 is connected, and the other end wall 12b of the shell 12 is
A pair of exhaust outlet pipes 14₁, 14_TwoAre connected in parallel with each other
Continued. The inside of the shell 12 has one end wall 12a side.
To the other end wall 12b side,
First, second, third and fourth partitions 15, 16, 17, 18
However, the outer edges of these 15 to 18 are fused to the inner peripheral surface of the shell 12.
They are fixedly arranged so as to be in contact with each other. With this one end
A first silencing chamber 19 between the wall 12a and the first partition 15;
A second silencing chamber 20 between the first and second bulkheads 15, 16;
A third silencing chamber 21 between the second and third bulkheads 16 and 17;
A third silencing chamber 22 between the third and fourth bulkheads 17 and 18;
A fifth sound deadening chamber 23 between the four partition walls 18 and the other end wall 12b;
Are formed in the shell 12. Thus, the first partition 15
Is disposed relatively close to one end wall 12a of the shell 12.
The first partition 15 has almost its entire surface
A number of small holes (not shown)
I have. The first, second and third exhaust introduction pipes 13 are provided.
First inner pipe 2 penetrating partition walls 15, 16, 17
4 is connected to one end of the first inner pipe 2.
The other end of 4 is opened to the fourth sound deadening chamber 22. And the first b
Around the portion of the inner pipe 24 corresponding to the third sound deadening chamber 21.
A large number of through holes 25 are formed in the wall. Fourth and
The fourth muffling room 2 extends between the fifth muffling room 22 and 23.
2, an interval is provided at the opening at the other end of the first inner pipe 24.
The second inner pipe 26 having one end opposed to the second
It is arranged so as to penetrate the wall 18. The fourth sound deadening chamber 22 and the second sound deadening chamber 20
The third inner pipe, which is relatively small in diameter,
27 and the fourth inner pipe 28 having a relatively large diameter
The fourth inner side is provided in the second sound deadening chamber 20 in parallel.
-From the fourth inner pipe 28 to the end of the pipe 28
Adjust the amount of exhaust gas flowing in the exhaust passage leading to the second silencing chamber 20
The flow control valve 30 is attached. This flow control valve 3
0 makes the flow resistance variable according to the exhaust pressure.
When the internal combustion engine is running at low speed and the exhaust pressure is relatively low
By increasing the flow resistance and reducing the exhaust flow
Reduces exhaust noise and reduces exhaust pressure when the internal combustion engine is running at high speed
When it becomes relatively high, reduce the flow resistance to reduce exhaust
Increase the output by reducing the exhaust resistance
It is something to do. Further, one end is opened to the second silencing chamber 20.
A pair of fifth inner pipes 31₁, 31_TwoIs the second and third
And arranged in parallel through the fourth bulkheads 16, 17, 18
These inner pipes 31₁, 31_Twoof
The other end is fixed to the other end wall 12 b of the shell 12,
Outgoing pipe 14₁, 14_TwoIs the fifth inner pipe 31₁, 3
1_TwoAre individually connected to the other end of the. In addition, the fifth inner pipe 31₁, 31_Two
As shown in FIG. 5, a plurality of through holes 32, 3
2 and an inner tube 33 coaxially bent around the inner tube 33
The sound absorbing material 35 is filled between the outer tube 34 and the
Sound portions 36, 36 are provided. Referring to FIG. 6, FIG. 7 and FIG.
The flow control valve 30 includes a valve housing 38 and the valve housing.
A rotating shaft 39 rotatably supported by the ring 38 and a valve housing
Valve body housed in jing 38 and fixed to rotation shaft 39
40 and the rotating shaft 39 is urged to one side around its axis.
The rotation urging spring 41 and the rotation shaft 39 are moved to one side in the axial direction.
And an axial biasing spring 42 for biasing.
It is fixedly supported by the well 12. Each of the valve housings 38 is formed in a dish shape.
First and second housing halves 38₁, 38_TwoBut
Welding and joining these open ends to each other
And is formed in a hollow box shape. Moreover, both housings
Half 38₁, 38_TwoThe support holes are located at
43 and 44 are provided coaxially. And the first house
Gu half 38₁Has a dish-like shape that opens toward the shell 12
The case member 45 formed is fixed by welding.
The case member 45 and the first housing half 38₁When
Between them, a metal bearing 46 facing the support hole 43 is sandwiched.
You. On the other hand, the second housing half 38_TwoThe outer surface of the second
Housing half 38_TwoDish-shaped support member 47 opened to the side
Are welded, and the support member 47 and the second housing
Half 38_TwoAnd a metal bearing 48 facing the support hole 44.
Is pinched. The rotating shaft 39 is formed by two metal bearings 46 and 48.
It is rotatably supported in the valve housing 38.
And a large-diameter shaft portion 39a that is housed in
The contact surface 39b formed into a tapered shape having a small diameter
Small diameter shaft portion 3 coaxially connected to one end of large diameter shaft portion 39a
9c and a small diameter shaft portion coaxially connected to the other end of the large diameter shaft portion 39a.
39d, and the small diameter shaft portion 39c on one side in the axial direction is the axis line.
It can be slid around and penetrated by the bearing metal 46,
Also, the small diameter shaft portion 39d on the other side in the axial direction slides around the axis.
Penetrated through bearing metal 48 if possible. Moreover, the bearing
The barrel 46 contacts the contact surface 39b of the rotating shaft 39 and rotates.
Taper for restricting the movement of the driving shaft 39 to one side in the axial direction
A regulating portion 46a is provided. A large-diameter shaft portion 39a of the rotating shaft 39 includes:
The valve housing 38 has a valve housing 38 with an outer edge closely facing the inner surface of the valve housing 38.
The valve body 40 housed in the jing 38 is connected to the valve housing 3.
8 so as to form an inflow chamber 49 between the inner surface and the inner surface.
Is done. On the other hand, the valve housing 38 flows through the inner end opening.
It enters the entry room 49 to face the valve body 40 and has an outer end.
Is fixedly provided at an inlet pipe 50 projecting outside.
A metal mesh is formed in a ring shape at the outer end of the tube 50
The spacer 51 is formed in the fourth inner
The outlet side end of the pipe 28 is fitted. As shown by the solid line in FIG.
And the minimum flow rate P at which the volume of the inflow chamber 49 is minimized.
₁As shown by the chain line in FIG.
Maximum flow rate position P_TwoIt is possible to rotate between
And the minimum flow rate P₁Means that the valve body 40 is
Abuts the inner end opening of the inlet pipe 50 to close the inner end opening of the inlet pipe 50.
It is determined by chaining, and the maximum flow rate position P_TwoThe valve
The stopper 40a connected to the body 40 is the inner end of the inlet pipe 50.
It is determined by abutting on the side wall. Incidentally, the valve body 40 has an inner end of an inlet pipe 50.
The exhaust pressure from the opening increases the volume of the inflow chamber 49
On the side to actuate the valve body 40.
The central portion of the surface of the valve body 40 on the side of the inlet pipe 50 is provided with the drainage.
A recess 40b is provided to receive the air pressure.
Between the rear surface of the rotary shaft 39 and the large-diameter shaft portion 39a of the rotating shaft 39;
A reinforcing member 52 is provided. The valve housing 38 has a minimum flow rate position.
P₁From the maximum flow rate P_TwoUp to the operating range of the valve body 40
Communication start point P set to_C(See Fig. 8)
Place P _TwoWhen the valve element 40 passes through the side, it is directly into the inflow chamber 49.
The exit window 53 for communication is at the communication start point P_CFrom the maximum flow rate
Place P_TwoTo the inflow chamber 49 in response to the actuation of the valve element 40 on the side
It is provided so that the area to be approached gradually increases. The minimum flow rate P of the valve body 40₁Flow from
Quantity maximum position P_TwoIn the operation process up to the minimum flow rate position
P₁From the communication start point P_CUntil the inlet pipe 50 to the inflow chamber 4
9 flows into the outer edge of the valve body 40 and the valve housing.
38 to the outlet window 53 through the gap between the inner surfaces 38.
And communication start point P_CFrom the maximum flow rate P_TwoUntil the inflow
Exhaust gas flows directly from the chamber 49 to the exit window 53. It is formed in a dish shape opened to the shell 12 side.
Housing half 38 of valve housing 38₁Connected to
A square flange 4 is provided at the open end of the case member 45.
5a is provided integrally. On the other hand, the shell 12
A hole 54 corresponding to the fan member 45 is provided.
The flange 45a contacts the inner surface of the shell 12 around the hole 54
Is done. Moreover, a plurality of, for example, four
The insertion holes 55 are provided, and the insertion holes 55
Each of the nuts 56 is opposite to the contact surface with the shell 12.
It is fixed to the flange 45a on the opposite side. A cover for covering the hole 54 is provided on the shell 12.
57 has a gasket 58 interposed between it and the outer surface of the shell 12
Then, it is detachably fixed. That is, the cover 57
Through the cover 57, gasket 58, and shell 12
Are screwed into the nuts 56 from the insertion holes 55, respectively.
Detachable from the shell 12 by a plurality of bolts 59.
It is fixed. In addition, the cover 57 has a
It has a surface shape and is formed in a cap shape. Between the cover 57 and the case member 45,
Isolated within shell 12 and within valve housing 38
At the same time, the spring chamber 60, which is shut off from the outside of the shell 12,
In this spring chamber 60, a rotational bias is applied.
The spring 41 and the axial biasing spring 42 are both housed.
You. That is, a small-diameter shaft at one end of the rotating shaft 39.
The portion 39c protrudes into the spring chamber 60, and this small-diameter shaft
A spring receiving member 61 fixed to an end of the portion 39c;
A dish-like plate welded to the inner end side of the case member 45 in the chamber 60
The rotation urging spring 41 and the axial direction
An urging spring 42 is provided. Thus, the rotation urging spring 42
With a torsion spring spirally wound around the small diameter shaft portion 39c
With the valve element 40 at the minimum flow rate P₁Biased toward the side
Both ends of the rotation urging spring 41 are springs to exert a spring force.
Engaged with the receiving member 61 and the locking member 62, respectively.
You. The axial biasing spring 42 surrounds the small diameter shaft portion 39c.
And biases the rotating shaft 39 to one side in the axial direction.
Receiving member 61 and locking portion for exerting a spring force
It is contracted between members 62. In addition, the rotation urging spring 41 is
The directional biasing spring 42 is arranged to bend. Next, the operation of this embodiment will be described.
And the valve C of the flow control valve 30 disposed in the silencer 11.
The housing 38 is set within the operating range of the valve body 40.
Communication start point P_CFrom the maximum flow rate P_TwoOf the valve body 40 to the side
In accordance with the operation, the area facing the inflow chamber 49 gradually increases.
A window 53 is provided. For this reason, the flow minimum position P
₁From the communication start point P_CWhen the valve body 40 is operated up to
The outer edge of the valve body 40 and the valve between the entrance 49 and the exit window 53
Flow through the gap formed between the inner surfaces of the housing 38
The resistance is determined and the communication start point P_CFrom the maximum flow rate P_TwoMa
When the valve body 40 is operated at the time, the inflow chamber 49 is
And the maximum flow rate position P_TwoAs you approach
Thus, the area of the exit window 53 facing the inflow chamber 49 increases. I
Therefore, the valve element 40 is set at the minimum flow rate position P.₁From the maximum flow rate
P_TwoBetween the fourth inner pipe 28 and the second
The flow resistance of the exhaust passage between the silencing chambers 20 is reduced.
Become. The rotation position of the rotation shaft 39, that is, the valve body
The flow resistance according to the operating position of 40 is such that the exit window 53 flows in.
Communication start point P to start communicating directly with chamber 49_CPosition, if
And the exit window 53 is in direct communication with the inflow chamber 49.
Is determined by the area of the exit window 53 facing the inflow chamber 49
Becomes the communication start point P_COf the operating range of the valve body 40
Position, or face the inflow chamber 49 of the exit window 53.
How to determine the area of the exit window 53
Can be set arbitrarily, and the rotation position of the rotation shaft 39, that is,
The flow resistance, that is, the flow amount, according to the operating position of the valve body 40
Can be set arbitrarily. In such a flow control valve 30,
The drive shaft 39 increases the flow resistance by the rotation urging spring 41.
But is urged by the axial biasing spring 42.
It is also biased to one side in the axial direction. For this reason, the rotating shaft 39
The contact surface 39b provided on the valve housing 38 side is provided.
Is pressed against the regulating portion 46a
It is avoided that the driving shaft 39 rattles along its axial direction.
Thus, generation of abnormal noise due to rattling is prevented. Moreover, around the rotation shaft 39 in the spring chamber 60
The rotation urging spring 41 surrounds the axial urging spring 42.
And using two springs 41 and 42
Space for both springs 41 and 42
Can be minimized. The spring chamber 60 is
Is isolated from the inside of the valve 12 and the inside of the valve housing 38.
The outside of the shell 12 is also shut off.
By storing both springs 41 and 42 in the spring chamber 60,
And both springs 41 and 42 are exposed outside the shell 12.
Rust occurs on both springs 41 and 42
That the two springs 41 and 42 are damaged by pebbles
No damage. Moreover, the contact surface 39b of the rotating shaft 39
Being pressed against the restricting portion 46a of the metal bearing 46
As a result, gas flows from inside the valve housing 38 into the spring chamber 60.
Leakage can be avoided as much as possible,
Even if there is a gas leak, the spring chamber 60
Gas is outside the shell 12
The cover 57 is cooled by outside air without leaking
As a result, the spring chamber 60 is prevented from overheating as much as possible.
The springs 41 and 42 are also prevented from being damaged by heat. Special
The cover 57 has a cross-sectional shape bulging outward.
Cooling effect by relatively large cooling area by outside air
Can be further improved. Further, the cover 57 is provided on the shell 12.
To the shell 12 so as to close the hole 54.
The cover 57 is removed from the shell 12.
The springs 41 and 42 can be removed for maintenance and inspection.
is there. The embodiment of the present invention has been described above.
The description is not limited to the above embodiment, but
Various designs without departing from the invention described in the scope
It is possible to make changes. For example, while facing the inlet pipe,
The valve body spring-biased in the direction close to the mouth pipe is the axis of the inlet pipe.
In the valve housing so that it moves linearly in the direction along the line
Flow rate regulating valve
It may be. [0034] As described above, according to the present invention,inner
Formed separately from the pipe and supported by the silencer shell
The inside of the valve housingBetween the valve housingFlow
Enter the roomWith formingTheOuter rim on inner surface of valve housing
Position where the valve body that is close to and opposed minimizes the volume of the inflow chamber
And the position that maximizes the volume of the inflow chamber.
NohEarnDelivered to the valve housingInner end into inflow chamber
To make the inner end opening face the valve body and
To the outside of the valve housing, and open the outer end opening
An inlet pipe fitted to the outlet end of the pipe is fixedly provided,
In the valve housing:Communication set within the operating range of the valve
Depending on the actuation of the valve body from the starting point to the volume increase side of the inflow chamber
Since an exit window is provided to increase the area facing the inflow chamber,
In which position the communication start point is set,Inner pa
In a valve housing separate from the IPThe shape of the exit window
Flow depending on the operating position of the valve
The flow resistance, that is, the flow rate can be set arbitrarily, and the exhaust pressure
Distribution resistance can be set relatively freely
You.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a muffler. FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. FIG. 3 is a longitudinal sectional view of the muffler taken along line 3-3 in FIG. 2; FIG. 4 is a longitudinal sectional view of the muffler taken along line 4-4 in FIG. 2; FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. 2; FIG. 7 is a sectional view taken along line 7-7 of FIG. 6; FIG. 8 is a sectional view taken along line 8-8 in FIG. 2; [Description of Signs] 11 ... Muffler 12 ... Shells 19, 20, 21, 22, 23 ... Muffler chamber 28 ... Inner pipe 30 ... Flow control valve 38 ... Valve housing 40 ... valve body 49 ... inflow chamber 50 ... inlet pipe 53 ... exit window P _C ... communication start point

Continuing from the front page (72) Inventor Isao Hirokawa 4480-17, Washizuku, Kitsuregawa-cho, Shioya-gun, Tochigi Prefecture Inside the Yutaka Giken Tochigi Technical Center (72) Inventor Katsunori Muramatsu 4480-17, Washijuku, Kitsuregawa-cho, Shioya-gun, Tochigi Ryuichi Matsushima, Inventor Ryuichi Matsushima, 4480-17 Washizuku, Kitsuregawa-cho, Shioya-gun, Tochigi Pref., Ltd. Inside Tochigi R & D Center, Tochigi (56) References JP-A-6-221130 (Japanese) Sho-61-108817 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F01N 1/08 F01N 7/08

Claims (1)

(1) A valve body (40) which receives exhaust pressure on the side where the flow resistance is reduced and is spring-biased on the side where the flow resistance is increased is connected to the valve housing (38). A flow control valve (30) operably housed in the muffler (11) includes a plurality of muffler chambers (19, 20,) formed in a shell (12) of the muffler (11).
21, 22, 23) of two muffling rooms (20, 22)
In an exhaust silencer for an internal combustion engine attached to an outlet side of an inner pipe (28) connecting between the silencers, the silencer is formed separately from the inner pipe (28).
Valve housing supported by shell (12) of (11)
Inside (38), between the valve housing (38)
The valve housing so as to form an inlet chamber (49) (3
The valve body (40) whose outer edge is closely opposed to the inner surface of the inflow chamber (4) is located at the position where the volume of the inflow chamber (49) is minimized.
9) Enables operation between the maximum position and
Te is retract and, in the valve housing (38), the inner end of the inlet chamber (49) in
When the inner end opening is opposed to the valve body (40)
The outer end is projected outside the valve housing (38) to open the outer end.
Part was fitted to the outlet end of the inner pipe (28).
An inlet pipe (50) is fixedly provided, and a valve housing (38) is further provided with an inflow chamber (4) from a communication start point (P _C ) set within an operation range of the valve body (40).
An outlet window (53) that gradually increases the area facing the inflow chamber (49) in accordance with the operation of the valve body (40) toward the volume increasing side of 9).
An exhaust silencer for an internal combustion engine, comprising: