CN107313833A - Engine silencing - Google Patents
Engine silencing Download PDFInfo
- Publication number
- CN107313833A CN107313833A CN201710134022.0A CN201710134022A CN107313833A CN 107313833 A CN107313833 A CN 107313833A CN 201710134022 A CN201710134022 A CN 201710134022A CN 107313833 A CN107313833 A CN 107313833A
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- CN
- China
- Prior art keywords
- room
- exhaust
- outlet
- flowed
- inflow entrance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/083—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using transversal baffles defining a tortuous path for the gases or successively throttling gas flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/06—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for hand-held tools or portables devices
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
The present invention provides a kind of engine silencing.The engine silencing improves the noise reducing effect of silencer.Silencer (50) includes：The housing (51) of box, it has the inflow entrance (52a) that supply and discharge gas is flowed into and the outlet (53a) for discharging exhaust；Demarcation strip (56), it will be divided into the 1st room (61) comprising inflow entrance and the 2nd room (62) comprising outlet in housing.Demarcation strip includes flat main part (56a) and the concavity (56b) prominent to the 2nd Room side.Main part has the through hole (57) for connecting Room the 1st with Room the 2nd in side.The contacted inner surfaces in the region (56bt3) and Room the 2nd of housing of the bottom (56bt) of concavity connect.Flowed into from inflow entrance in Room the 1st and flowed by way of through hole reaches 2nd concave part (56b2) of the exhaust of the side in Room the 2nd in Room the 2nd to bypass concavity and reach outlet via the opposite side in Room the 2nd.
Description
Technical field
The present invention relates to a kind of engine silencing.
Background technology
The engine silencing such as housing including box of the portable working machines such as brush cutter is equipped on, the box
Housing has the inflow entrance that the exhaust outlet and supply and discharge gas that are connected to engine are flowed into and the outlet for discharging the exhaust flowed into.
The Room the 1st comprising the inflow entrance and the Room the 2nd comprising the outlet are divided into by demarcation strip in the housing.Demarcation strip has
Multiple through holes for connecting Room the 1st with Room the 2nd.
There is such engine silencing disclosed in patent document 1.
Prior art literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2014-181580 publications
The content of the invention
Problems to be solved by the invention
However, in the silencer disclosed in patent document 1, being vented from the through hole of demarcation strip to the outlet of housing
Actual flow distance (displacement) is relatively shorter.Thus, it is difficult to the pressure of exhaust is reduced in the 2nd indoor highly effective, and then, it is difficult
Fully to obtain the noise reducing effect of silencer.
The present invention is in view of such actual conditions, it is therefore intended that improve the noise reducing effect of silencer.
The solution used to solve the problem
Therefore, in the engine silencing of the 1st mode of the present invention, the engine silencing includes：Box
Housing, it has the inflow entrance that the exhaust outlet and supply and discharge gas that are connected to engine are flowed into and the discharge for discharging the exhaust flowed into
Mouthful；And demarcation strip, it will be divided into the Room the 1st comprising the inflow entrance and the Room the 2nd comprising the outlet in housing.Point
Dividing plate includes flat main part and the concavity more prominent to the 2nd Room side than the main part.Have extremely in the side of main part
Lack a through hole for connecting Room the 1st with Room the 2nd.At least a portion of the bottom of concavity and the interior table of Room the 2nd of housing
Face is abutted against.The exhaust for being flowed into from the inflow entrance in Room the 1st and reaching the side in Room the 2nd by the through hole exists
Flowed in Room 2nd in the way of bypassing concavity and reach the outlet via the opposite side in Room the 2nd.
In the engine silencing of the 2nd mode of the present invention, the engine silencing includes：The housing of box,
It has the inflow entrance that the exhaust outlet and supply and discharge gas that are connected to engine are flowed into and the outlet for discharging the exhaust flowed into；Point
Dividing plate, it will be divided into the Room the 1st comprising the inflow entrance and the Room the 2nd comprising the outlet in housing；And flowing limit
Portion processed, it partly limits flowing of the exhaust in Room the 2nd.There is at least one by Room the 1st and Room the 2nd in the side of demarcation strip
The through hole of connection.The row of the side in Room the 2nd is flowed into Room the 1st and reached by the through hole from the inflow entrance
Gas is flowed in the way of bypassing flowing limiting unit in Room the 2nd and reaches the outlet via the opposite side in Room the 2nd.
The effect of invention
According to the present invention the 1st mode, at least a portion of the bottom of the concavity of demarcation strip with Room the 2nd of housing
Surface is abutted against.In addition, being flowed into Room the 1st and being reached by the through hole of demarcation strip in Room the 2nd from the inflow entrance of housing
The exhaust of side flowed in the way of the concavity for bypassing demarcation strip and reached via the opposite side in Room the 2nd in Room the 2nd
The outlet of housing.Thereby, it is possible to make the through hole from demarcation strip of exhaust to the substantive flow distance of the outlet of housing
(displacement) becomes longer, therefore, it is possible to reduce the pressure of exhaust in the 2nd indoor highly effective, and then, it is possible to increase silencer
Noise reducing effect.
According to the 2nd mode of the present invention, flowing limiting unit partly limits flowing of the exhaust in Room the 2nd.In addition, from shell
The inflow entrance of body is flowed into Room the 1st and the exhaust of the side in Room the 2nd is reached by the through hole of demarcation strip in Room the 2nd
The outlet of housing is flowed and reached via the opposite side in Room the 2nd in the way of bypassing flowing limiting unit.Thereby, it is possible to make row
The substantive flow distance (displacement) of the through hole from demarcation strip of gas to the outlet of housing becomes longer, accordingly, it is capable to
It is enough that the pressure of exhaust is reduced in the 2nd indoor highly effective, and then, it is possible to increase the noise reducing effect of silencer.
Brief description of the drawings
Fig. 1 is the stereogram of the brush cutter of one embodiment of the present invention.
Fig. 2 is the explanation figure of the use state of the brush cutter of the embodiment.
Fig. 3 is the sectional view of the schematic configuration of the engine and silencer that represent the embodiment.
Fig. 4 is the front view of the silencer of the embodiment.
Fig. 5 is Fig. 4 I-I sectional views.
Fig. 6 is Fig. 4 II-II sectional views.
Fig. 7 is the front view of the demarcation strip of the embodiment.
Fig. 8 is the figure of the flowing of the exhaust in the silencer for represent the embodiment.
Fig. 9 is the figure of the flowing of the exhaust in the silencer for represent the embodiment.
Description of reference numerals
1st, brush cutter；3rd, engine pack；11st, cover；21st, engine；36th, exhaust outlet；50th, silencer；51st, housing；52、
1st container；52a, inflow entrance；53rd, the 2nd container；53a, outlet；53a1, opening portion；53p, convex shaped part；53q, opening portion；
54th, 55, outward flange section；56th, demarcation strip；56a, main part；56b, concavity；56b1, the 1st concave part；56b2, the 2nd concavity
Part；56bt, bottom；56bt1, exhaust channel forming portion；56bt2, exhaust guide part；56bt3, region；57th, through hole；58、
Guiding elements；61st, Room the 1st；62nd, Room the 2nd；65th, cylindrical portion；65a, through hole；67th, exhaust channel；70th, limiting unit is flowed；S1
~S5, the flowing of exhaust.
Embodiment
Hereinafter, with reference to the accompanying drawings of embodiments of the present invention.
Fig. 1 is the stereogram of the brush cutter of one embodiment of the present invention.Fig. 2 is the explanation of the use state of brush cutter
Figure.In addition, in the present embodiment, as an example of the portable working machine for the engine silencing for carrying the present invention,
Brush cutter is exemplified below to illustrate, but the portable working machine of the engine silencing of the carrying present invention is not limited to
This.
Brush cutter 1 has the action bars 2 formed by long tube.The engine as power source is provided with the rear end of action bars 2
Component 3.The installation portion 4 of the instrument as work department is provided with the front end of action bars 2.Instrument can be pacified in the way of it can change
Mounted in the installation portion 4 of instrument.The installation portion 4 of instrument is connected using the drive shaft for being built in action bars 2 with engine pack 3.
The installation portion 4 of instrument utilizes engine pack 3 (being specifically engine 21) rotation driving.
Central portion on the longitudinally of action bars 2 is provided with handle 5.It is provided between handle 5 and engine pack 3
Vibrationproof housing 6.Suspension bracket 7 is installed in the periphery of vibrationproof housing 6.
Enterprising exercise of shoulder that brush cutter 1 is suspended in operating personnel M using suspender 8 is used.Suspender 8 has brace 9 and metal
Accessory 10.Brace 9 is worn on above the waist by operating personnel M.In fig. 2, metal fittings 10 are sagging on operating personnel M right side.
Suspension bracket 7 is installed on metal fittings 10 by operating personnel M, and uses under the suspension status brush cutter 1.Operating personnel M is with the hands
The handle 5 of brush cutter 1 is held, and by acting brush cutter 1, thus allows for brush work.
The engine 21 that cover 11, quilt cover 11 of the engine pack 3 mainly comprising its shell of composition are covered is (with reference to figure described later
And silencer 50 3).Here, silencer 50 corresponds to " engine silencing " of the present invention.In addition, cover 11 is, for example, to set
Fat system.
Fig. 3 is the sectional view for the schematic configuration for representing engine 21 and silencer 50.Here, Fig. 3 represents to be in piston 25
Engine 21 in the state of near top dead center.In addition, in the present embodiment, upside is with engine 21 the most frequently used
It is substantially uniform on the upside of vertical under state (upright state).
Engine 21 is the four-stroke engine of OHV (Over Head Valve) form, and is air-cooled type.Engine 21
Including cylinder body portion 22, the crankcase 23 for the bottom for being installed on cylinder body portion 22 and the fuel tank 24 located at the lower section of crankcase 23.
Cylinder body portion 22 has the columned space for being used for making piston 25 be slided along the above-below direction in Fig. 3.Moreover, at this
Have in space and be embedded with piston 25 with gap, piston 25 is in figure 3 along the vertical direction slidably.
Crankshaft room 27 is formed with using cylinder body portion 22, crankcase 23 and piston 25.That is, using by cylinder body portion 22
Side and piston 25 formation the side of crankcase 23 cylindrical space and crankcase 23 in space be formed with crankshaft room 27.
The volume of the inner space of the crankshaft room 27 is as piston 25 is slided and is changed.
Utilize cylinder cap 28, cylinder body portion 22 and piston 25 formation combuster 29.
Fuel tank 24 is limited by fuel tank shell, and is provided separately with crankcase 23, the oil for storing lubrication.
Check-valves 30 is provided between fuel tank 24 and crankcase 23, check-valves 30 only allows oil from the (crankshaft room of crankcase 23
27) flowed to fuel tank 24.
Here, the pressure in crankshaft room 27 turns into negative pressure as piston 25 is moved to top dead centre from lower dead center.On the contrary, bent
Pressure in axle room 27 turns into malleation as piston 25 is moved to lower dead center from top dead centre.Thus, the pressure in crankshaft room 27
When power is malleation, check-valves 30 is opened, and oil flows from crankshaft room 27 to fuel tank 24.In addition, the pressure in crankshaft room 27 turns into
During negative pressure, check-valves 30 is closed.
In crankcase 23 crank 33 is supported with to rotate free mode.Crank 33 includes the bent axle as pivot
33a, counterweight etc..Piston 25 and crank 33 are connected using connecting rod 34.Connecting rod 34 and piston 25 are connected in the way of it can swing
Connect.Connecting rod 34 and crank 33 are connected in the way of it can rotate.Using such structure, piston 25 is back and forth slided in cylinder body portion 22
It is dynamic.
Upper wall in cylinder body portion 22 is provided with cylinder cap 28.Air inlet 35 and exhaust outlet 36 are provided with cylinder cap 28.
Air inlet 35 is connected across insulator (not shown) with carburetor (not shown).It is provided with the upstream side of the carburetor
Air cleaner (not shown).Here, engine pack 3 also includes described insulator, carburetor, air cleaner and combustion
Expect the fuel tank (not shown) of storage.In addition, described insulator, carburetor and air cleaner quilt cover 11 are covered.Separately
Outside, described carburetor is to be blended in fuel in the air for having passed through described air cleaner to generate mixed gas
Device.
Silencer 50 is formed as the slim silencer of lengthwise longer in the vertical direction.In the present embodiment, eliminate the noise
The exhaust outlet 36 of device 50 and engine 21 directly links, and is interconnected.On the details of silencer 50, using Fig. 4~
Illustrated after Fig. 7.
The intake valve 37 for being used for being opened and closed air inlet 35 is provided with cylinder cap 28.In addition, being provided with cylinder cap 28 is used to be opened and closed
The air bleeding valve 38 of exhaust outlet 36.Here, intake valve 37 and the opening and closing of air bleeding valve 38 combustion chamber 29.
Then, in addition to described Fig. 3, also silencer 50 is described in detail using Fig. 4~Fig. 7.
Fig. 4 is the front view of silencer 50.Fig. 5 is Fig. 4 I-I sectional views.Fig. 6 is Fig. 4 II-II sectional views.Fig. 7 is
The front view of demarcation strip 56.In addition, it is following, for convenience of explanation, provide as shown in Figure 4 to 7 up and down.In addition, will
Side close to engine 21 is set to inflow side, will be (in other words, remote to start with close to the opposite side in the side of engine 21
The side of machine 21) it is set to discharge side.Here, as described above, " upside " in Fig. 4~Fig. 7 and the most frequently used state of engine 21
It is substantially uniform on the upside of vertical under (upright state).In addition, " left side " in Fig. 4~Fig. 7 correspond to the present invention " side " and
" horizontal side ", on the other hand, " right side " correspond to " opposite side " and " horizontal opposite side " of the present invention.
Silencer 50 includes housing 51, demarcation strip 56 and guiding elements 58.
Housing 51 is substantially rectangular box-like, including the 1st container 52 and the 2nd container 53.In addition, in the present embodiment,
1st container 52 and the 2nd container 53 are metal system, alternatively, it is also possible to for can resistant to elevated temperatures FRP (Fiber Reinforced
The resin-made such as Plastics).
1st container 52 constitutes the inflow side of housing 51.1st container 52 is to discharge the substantially rectangular case of side opening at it
Shape.1st container 52 has in the outstanding outward flange section 54 in the peripheral part of its discharge side.
Inflow entrance 52a is provided with the top of the 1st container 52.Inflow entrance 52a is connected to exhaust outlet 36.Here, due to the 1st
The top of container 52 is provided with inflow entrance 52a, therefore, it is possible to which silencer 50 is suppressed from the upwardly projecting overhang of engine 21
Obtain smaller.
2nd container 53 constitutes the discharge side of housing 51.2nd container 53 is to flow into the substantially rectangular case of side opening at it
Shape.2nd container 53 has in the outstanding outward flange section 55 in the peripheral part of its inflow side.
In the position than above-below direction central portion slightly on the lower of the 2nd container 53, with outside (one opposite with the 2nd Room 62
Side) prominent mode is formed with convex shaped part 53p.As shown in figure 4, convex shaped part 53p from front from when in the rectangle shape grown crosswise
Shape.The convex shaped part 53p formation substantially cross sectional shape of U-shaped and transversely (left and right directions) extension.In convex shaped part 53p left-hand end
Portion is formed with opening portion 53q.Here, substantially rectangular opening portion (in other words, the convex of convex shaped part 53p inflow side end
The substantially rectangular opening portion of portion 53p cardinal extremity side end) correspond to outlet 53a.Thus, convex shaped part 53p is with the row of covering
Outlet 53a mode is outstanding and with opening portion 53q.
Metal system or resinous demarcation strip 56 include substantially rectangular flat main part 56a and are formed at its transverse direction
The concavity 56b of (left and right directions) central portion.
The main part 56a of demarcation strip 56 is with its peripheral part by the evagination of the container 53 of outward flange section 54 and the 2nd of the 1st container 52
The state that edge 55 holds is fixed by caulking to the 1st container 52 and the 2nd container 53.Thus, in housing 51, utilize the 1st container
52 and demarcation strip 56 divide and form the 1st Room 61, in addition, utilizing the 2nd container 53 and demarcation strip 56 to divide forms the 2nd Room 62.Here,
1st Room 61 includes inflow entrance 52a.On the other hand, the 2nd Room 62 includes outlet 53a.In addition, the 1st Room 61 is by inflow entrance 52a
Connected with exhaust outlet 36.
The concavity 56b of demarcation strip 56 includes the 1st concave part 56b1 for constituting its top and constituted in its above-below direction
Centre portion and the 2nd concave part 56b2 of bottom.
1st concave part 56b1 is relative with the inflow entrance 52a of the 1st container 52 across guiding elements 58.In other words, in guiding
Component 58 be located between the 1st concave part 56b1 and the inflow entrance 52a of the 1st container 52 in the state of, the 1st concave part 56b1 and
The inflow entrance 52a of 1st container 52 is relative to each other.
1st concave part 56b1 from inflow entrance 52a sides towards discharge side (that is, more from inflow side towards discharge side) more to go
The mode extended downwards is in bowing.It is received from inflow entrance 52a here, the 1st concave part 56b1 has and is flowed into the 1st
Exhaust in room 61 and by the function of its (such as the 2nd concave part 56b2) guiding downwards.
1st concave part 56b1 bottom and the 2nd concave part 56b2 upper end is mutually continuous.2nd concave part
56b2 is more prominent to discharge side than the 1st concave part 56b1.
As shown in fig. 7, the 2nd concave part 56b2 from front when in the form of a substantially rectangular, and in its bottom 56bt at least
A part (for example, referring to the part P shown in Fig. 6) and the 2nd container 53 contacted inner surfaces connect.That is, concavity 56b bottom
56bt at least a portion and the contacted inner surfaces of the 2nd Room 62 of housing 51 connect.Here, bottom 56bt refers to concavity 56b's
The part of end wall in 2nd concave part 56b2, forming discharge side.
2nd concave part 56b2 bottom 56bt has exhaust channel forming portion 56bt1 slightly prominent to discharge side.Exhaust
The described outlet 53a of a passage forming portion 56bt1 closings part (in the present embodiment, at least left-half).
This, part in the outlet 53a, not by exhaust channel forming portion 56bt1 closings is opened as the substantive of outlet 53a
Oral area point 53a1.In addition, exhaust channel forming portion 56bt1 " encloses discharge corresponding to the present invention in the bottom surface of concavity
The part of a part for mouth ".
Exhaust is formed with the 2nd concave part 56b2 in the mode adjacent with exhaust channel forming portion 56bt1 right side to draw
Lead portion 56bt2.As shown in fig. 7, being formed as the channel-shaped being recessed to the side of Room the 1st 61 when exhaust guide part 56bt2 is from front.Row
Gas guide portion 56bt2 has the function for the substantive opening portion 53a1 that the exhaust in the 2nd Room 62 is imported to outlet 53a.
As shown in fig. 7, the left part in the main part 56a of demarcation strip 56 is formed with multiple (being ten in Fig. 7) insertions
Hole 57.Here, through hole 57 is located at the position lower than the inflow entrance 52a of the 1st container 52.Passed through in addition, illustrating ten in the figure 7
Through hole 57, but the number of through hole 57 is not limited to this.
In addition, in the present embodiment, as shown in fig. 6, in transverse direction (left and right directions), concavity 56b the (the particularly, the 2nd
Concave part 56b2) it is located at outlet 53a (particularly, outlet 53a substantive opening portion 53a1) and multiple through holes
Between 57.Here, in the present embodiment, as shown in fig. 7, in concavity 56b the 2nd concave part 56b2 bottom 56bt
, the upside to surround exhaust channel forming portion 56bt1, the region 56bt3 of the C-shaped extended in the way of downside and left side with
The contacted inner surfaces of the 2nd Room 62 in housing 51 connect.
Using the 2nd container 53 convex shaped part 53p and demarcation strip 56 the 2nd concave part 56b2 exhaust channel forming portion
The exhaust channel 67 of tubulose of the 56bt1 formation with substantially rectangular cross sectional shape.Exhaust channel 67 is transversely (left and right directions)
Extension, and connected in its right part by outlet 53a (particularly, substantive opening portion 53a1) with the 2nd Room 62.Separately
Outside, the left part of exhaust channel 67 corresponds to described opening portion 53q.(particularly, exhaust channel 67 is used for from outlet 53a
The opening portion 53a1 of essence) guide exhaust to opening portion 53q.
On housing 51, at least one (being two in Fig. 4 and Fig. 6) cylindrical portion 65 has been formed through.Cylindrical portion 65 with
The mode of the container 52 of insertion the 1st, the 2nd container 53 and demarcation strip 56 is formed respectively, in cylindrical portion 65, is inserted into housing
51 are fixed on the bolt (not shown) of engine 21.In addition, two cylindrical portions 65 are illustrated in Fig. 4 and Fig. 6, but cylindrical portion 65
Number be not limited to this.In addition, in the figure 7, it is illustrated that the through hole 65a inserted for cylindrical portion 65.
Guiding elements 58 is metal system or resin-made, is installed on the inflow entrance 52a of the 1st container 52.Guiding elements 58 has
The cross sectional shape of the unlimited U-shaped of lower surface, and extend from the inflow entrance 52a of the 1st container 52 towards discharge side.Guiding elements 58
With the concavity that the exhaust being flowed into from exhaust outlet 36 by inflow entrance 52a in the 1st Room 61 is successfully directed to demarcation strip 56
Portion 56b function.
In the present embodiment, the concavity 56b (particularly, the 2nd concave part 56b2) of demarcation strip 56 is used as flowing limit
The function of portion 70 processed, partly flowing of the limitation exhaust in the 2nd Room 62.Here, flowing limiting unit 70 is particularly in Room the 2nd
In 62, to exhaust from through hole 57 towards outlet 53a (particularly, substantive opening portion 53a1), straight in transverse direction
Line flowing is limited.In addition, in the present embodiment, flowing limiting unit 70 is a part (the concavity 56b of demarcation strip 56
(particularly, the 2nd concave part 56b2)).In addition, between housing 51, (particularly, the 2nd holds flowing limiting unit 70 in the 2nd Room 62
Device 53) between demarcation strip 56 (particularly, main part 56a).
In the present embodiment, as shown in figure 5, demarcation strip 56 is with the flowing of the exhaust at the inflow entrance 52a of the 1st container 52
The direction F1 and main part 56a of demarcation strip 56 formation of the bearing of trend F2 from lower end to upper end obtuse angle θ 1 mode, located at shell
Body 51.Obtuse angle θ 1 is preferably in the range of 95 °~125 °, more preferably in the range of 100 °~120 °.
In the present embodiment, the bottom of the main part 56a with demarcation strip 56 on the inwall of the bottom of the 1st Room 61
The distance between relative part and the main part 56a bottom of demarcation strip 56 L1 are longer than the inwall of the bottom of the 2nd Room 62
On the main part 56a with demarcation strip 56 the relative part in bottom and demarcation strip 56 main part 56a bottom between
Apart from L2.In addition, demarcation strip 56 has concavity 56b.Thereby, it is possible to fully ensure the exhaust stream for being available for HTHP
The volume of the 1st Room 61 entered.
Then, the flowing of exhaust discharged from exhaust outlet 36 via silencer 50 to outside is illustrated.
Fig. 8 and Fig. 9 are the figures of the flowing of the exhaust in the silencer 50 for represent present embodiment.Here, Fig. 8 (A) is right
Fig. 5 described in Ying Yu, Fig. 9 (A) correspond to described Fig. 6, and Fig. 8 (B) and Fig. 9 (B) corresponds to described Fig. 7.
The direction quilt of the flowing of the exhaust in the 1st Room 61 is flowed into via the inflow entrance 52a of silencer 50 from exhaust outlet 36
The concavity 56b (particularly, the 1st concave part 56b1) of demarcation strip 56 changes into downward ((A) of reference picture 8 and Fig. 8's
(B) as the flowing S1 of the exhaust shown in arrow in).Here, concavity 56b (particularly, the 1st concave parts of demarcation strip 56
56b1) realize the function of being received from exhaust that inflow entrance 52a is flowed into the 1st Room 61 and be directed to lower section.
Exhaust is spread and cooled down in the 1st Room 61, afterwards, is flowed into by the through hole 57 of demarcation strip 56 62 in Room the 2nd
Left part (as the flowing S2 of the exhaust shown in arrow in (A) of reference picture 8, Fig. 8 (B) and Fig. 9 (A)).
The exhaust for the left part being flowed into the 2nd Room 62 is in the 2nd Room 62 with around the concavity 56b of demarcation strip 56
Mode above and below (particularly, the 2nd concave part 56b2) flows and reaches the right part (reference in the 2nd Room 62
As the flowing S3 and S4 of the exhaust shown in arrow in Fig. 9 (A) and Fig. 9 (B)).In addition, exhaust also can in the 2nd Room 62
Spread and cooled down.
Then, exhaust (is particularly, substantive opening portion via the exhaust guide part 56bt2 and outlet 53a of demarcation strip 56
Point 53a1) and by exhaust channel 67, and from the opening portion 53q of exhaust channel 67 by outside release ((A) of reference picture 9 and
As the flowing S5 of the exhaust shown in arrow in Fig. 9 (B)).
In addition, the 1st container 52, the 2nd container 53 and demarcation strip 56 are heated from by the exhaust in silencer 50, and should
Heat discharges from the outer surface of the 1st container 52 and the outwardly portion of the 2nd container 53.
According to present embodiment, silencer 50 includes：The housing 51 of box, it has the exhaust outlet for being connected to engine 21
The 36 and inflow entrance 52a of the supply and discharge gas inflow and outlet 53a by the exhaust discharge flowed into；Demarcation strip 56, it is by housing 51
Inside it is divided into the 1st Room 61 comprising inflow entrance 52a and the 2nd Room 62 comprising outlet 53a.Demarcation strip 56 includes flat master
The body portion 56a and concavity 56b more prominent to the side of Room the 2nd 62 than main part 56a.Have in main part 56a side (left side)
At least one through hole 57 for connecting the 1st Room 61 with the 2nd Room 62.Concavity 56b bottom 56bt at least a portion is (for example
Region 56bt3) connect with the contacted inner surfaces of the 2nd Room 62 of housing 51.Flowed into from inflow entrance 52a in the 1st Room 61 and pass through insertion
The exhaust that hole 57 reaches the side (left side) in the 2nd Room 62 (is particularly, the 2nd is recessed in the 2nd Room 62 with bypassing concavity 56b
Shape part 56b2) mode flow and to reach outlet 53a via the opposite side (right side) in the 2nd Room 62 (particularly, substantive
Opening portion 53a1) (reference picture 8 and flowing S1~S5 of the exhaust shown in Fig. 9).Thereby, it is possible to make exhaust from demarcation strip 56
Through hole 57 to the outlet 53a of housing 51 substantive flow distance (displacement) become longer, therefore, it is possible to
The pressure of exhaust is efficiently reduced in 2 Room 62, and then, it is possible to increase the noise reducing effect of silencer.
In addition, according to present embodiment, it is (special that concavity 56b (particularly, the 2nd concave part 56b2) is located at outlet 53a
It is not, substantive opening portion 53a1) between through hole 57.Thereby, it is possible to utilize simple structure, make separating certainly for exhaust
The through hole 57 of plate 56 to the outlet 53a of housing 51 substantive flow distance (displacement) become longer.
In addition, according to present embodiment, concavity 56b (particularly, the 1st concave part 56b1) is relative with inflow entrance 52a.
The 1st is flowed into thereby, it is possible to successfully be received from inflow entrance 52a using concavity 56b (particularly, the 1st concave part 56b1)
Exhaust in room 61.
In addition, according to present embodiment, inflow entrance 52a is located at the top of the 1st Room 61.Concavity 56b is received from inflow entrance
Exhaust that 52a is flowed into the 1st Room 61 simultaneously guides downwards it.Thus, exhaust can spread simultaneously well in the 1st Room 61
Cooling.
In addition, according to present embodiment, main part 56a has through hole 57 in its horizontal side (left side).From inflow entrance
52a is flowed into the 1st Room 61 and the exhaust of the horizontal side (left side) in the 2nd Room 62 is reached by through hole 57 in Room the 2nd
Flowed and via Room the 2nd in the mode above and below concavity 56b (particularly, the 2nd concave part 56b2) in 62
Horizontal opposite side (right side) in 62 reaches outlet 53a (particularly, substantive opening portion 53a1) (reference picture 8 and Fig. 9 institutes
Flowing S1~the S5 for the exhaust shown).Thereby, it is possible to make the through hole 57 from demarcation strip 56 of exhaust to the outlet of housing 51
53a substantive flow distance (displacement) becomes longer, therefore, it is possible to efficiently reduce the pressure of exhaust in the 2nd Room 62
Power, and then, it is possible to increase the noise reducing effect of silencer.
In addition, according to present embodiment, housing 51 (particularly, the 2nd container 53) includes convex shaped part 53p, convex shaped part 53p
It is outstanding in the way of covering outlet 53a, and with opening portion 53q.Utilize the closing in concavity 56b bottom 56bt
The part of an outlet 53a part (exhaust channel forming portion 56bt1) and convex shaped part 53p formation from outlet 53a (especially
Be, substantive opening portion 53a1) to opening portion 53q guide exhaust tubulose exhaust channel 67.Thereby, it is possible to omit in the past
The pipeline of the exhaust as independent component of the outer surface of housing 51 (particularly, the 2nd container 53) is installed on, and utilizes exhaust
Path 67 realizes the function of the pipeline, therefore, it is possible to the number for the component parts for reducing the pipeline.In addition, can only pass through
The convex shaped part 53p of the combined shell 51 and exhaust channel forming portion 56bt1 of demarcation strip 56 can play work(to be formed as the pipeline
The part of energy, it is therefore, compared with the past, the operation to be formed needed for the pipeline can be greatly decreased.
In addition, according to present embodiment, silencer 50 includes：The housing 51 of box, it, which has, is connected to engine 21
Inflow entrance 52a and the outlet 53a by the exhaust discharge flowed into that exhaust outlet 36 and supply and discharge gas are flowed into；Demarcation strip 56, it will
The 1st Room 61 comprising inflow entrance 52a and the 2nd Room 62 comprising outlet 53a are divided into housing 51；And flowing limiting unit
70, its local limit is vented the flowing in the 2nd Room 62.Demarcation strip 56 has at least one by Room the 1st in its side (left side)
61 through holes 57 connected with the 2nd Room 62.It is flowed into from inflow entrance 52a in the 1st Room 61 and Room the 2nd is reached by through hole 57
The exhaust of side (left side) in 62 is flowed and via in the 2nd Room 62 in the 2nd Room 62 in the way of bypassing flowing limiting unit 70
Opposite side (right side) reach outlet 53a (particularly, substantive opening portion 53a1) (reference picture 8 and the exhaust shown in Fig. 9
Flowing S1~S5).Thereby, it is possible to make the through hole 57 from demarcation strip 56 of exhaust to the outlet 53a of housing 51 essence
Flow distance (displacement) become longer, therefore, it is possible to efficiently reduce the pressure of exhaust in the 2nd Room 62, and then, energy
Enough improve the noise reducing effect of silencer.
In addition, according to present embodiment, flowing limiting unit 70 is located at outlet 53a (particularly, substantive opening portions
53a1) between through hole 57.Thereby, it is possible to utilize simple structure, make the through hole 57 from demarcation strip 56 of exhaust to shell
The outlet 53a of body 51 substantive flow distance (displacement) becomes longer.
In addition, according to present embodiment, main part 56a has through hole 57 in its horizontal side (left side).From inflow entrance
52a is flowed into the 1st Room 61 and the exhaust of the horizontal side (left side) in the 2nd Room 62 is reached by through hole 57 in the 2nd Room 62
It is interior to flow and arrived via the horizontal opposite side (right side) in the 2nd Room 62 in the way of above and below flowing limiting unit 70
Up to outlet 53a (particularly, substantive opening portion 53a1) (reference picture 8 and flowing S1~S5 of the exhaust shown in Fig. 9).By
This, can make the through hole 57 from demarcation strip 56 of exhaust to the outlet 53a of housing 51 substantive flow distance (it is mobile away from
From) become longer, therefore, it is possible to efficiently reducing the pressure of exhaust in the 2nd Room 62, and then, it is possible to increase silencer is made an uproar
Sound reducing effect.
In addition, according to present embodiment, flowing the part that limiting unit 70 is demarcation strip 56, (concavity 56b is (particularly,
2nd concave part 56b2)).Thus, it is not necessary in order to formed flowing limiting unit 70 and use extra component, and then, can press down
The increase of components number processed.
In addition, according to present embodiment, flowing limiting unit 70 is in the 2nd Room 62 between (particularly, the 2nd container of housing 51
53) between demarcation strip 56 (particularly, main part 56a).Thus, in the 2nd Room 62, from its left part, part is flowed to the right
Dynamic exhaust can be flowed in midway in the way of above and below flowing limiting unit 70.
In addition, in the present embodiment, exemplified with the exhaust partly flowed to the right from its left part in the 2nd Room 62
Midway with around the top of flowing limiting unit 70 (the concavity 56b (particularly, the 2nd concave part 56b2) of demarcation strip 56) and
The example that the mode of lower section flows, but on the circuitous path of exhaust, as long as flow the (concavity of demarcation strip 56 of limiting unit 70
56b (particularly, the 2nd concave part 56b2)) above and below at least one.I.e. or, in the 2nd Room 62
The interior exhaust partly flowed to the right from its left part is in midway with around the flowing (concavity of demarcation strip 56 of limiting unit 70
56b (particularly, the 2nd concave part 56b2)) above or below mode flow.
In addition, in the present embodiment, as an example of flowing limiting unit 70, enumerating the concavity for illustrating demarcation strip 56
Portion 56b (particularly, the 2nd concave part 56b2), but the structure of flowing limiting unit 70 is not limited to this.
As another example of flowing limiting unit 70, instead of forming the 2nd concave part 56b2 on demarcation strip 56, may be used also
To enumerate the situation of integrally formed 2nd container 53 in the way of comprising the part corresponding with flowing limiting unit 70.In the situation
Under, flowing limiting unit 70 turns into a part for housing 51 (particularly, the 2nd container 53).
As another example of flowing limiting unit 70, it is also possible that demarcation strip 56 is set into flat main part
56a, and the additional member of the 2nd described concave part 56b2 will be replaced installed in the main part 56a and the 2nd container of demarcation strip 56
Between 53 inner surface.In this case, described additional member is situated between with flowing limiting unit 70 accordingly in the 2nd Room 62
In housing 51 (particularly, the 2nd container 53) between demarcation strip 56.
In addition, in the present embodiment, as an example of the portable working machine for carrying silencer 50, enumerating and illustrating
Brush cutter, but the portable working machine of carrying silencer 50 is not limited to this.For example, silencer 50 can be equipped on brill soil
The portable working machines such as machine, concrete cutting machine.In addition, silencer 50 can be equipped on backpack air blower, sprayer (spraying
Machine), duster, the backpack working machine such as knapsack type brush cutter.
In addition, in the present embodiment, exemplified with example of the engine 21 for the four-stroke engine of OHV forms, but sending out
The structure of motivation 21 is not limited to this, for example, engine 21 can also be the engine of OHC forms.
In addition, in the present embodiment, exemplified with the cylinder cap 28 in engine 21 and example that cylinder body portion 22 is independent individual
Son, but it is also possible to instead of being integrated cylinder cap and cylinder body portion in this.
As can seen above, described embodiment is only used for illustrating the present invention, and the present invention is illustrated except utilizing
Beyond the content that embodiment is directly shown, also comprising can be carried out in the range of claims by those skilled in the art
Various improvement, change, this point is self-evident.
Claims (11)
1. a kind of engine silencing, wherein,
The engine silencing includes：
The housing of box, it has the inflow entrance that the exhaust outlet and supply and discharge gas that are connected to engine flow into and by the exhaust flowed into
The outlet of discharge；And
Demarcation strip, it will be divided into the Room the 1st comprising the inflow entrance and the Room the 2nd comprising the outlet in housing,
The demarcation strip includes flat main part and the concavity more prominent to the 2nd Room side than the main part,
The main part has the through hole that at least one connects the Room the 1st with the Room the 2nd in its side,
At least a portion of the bottom of the concavity is connected to the inner surface of the Room the 2nd of the housing,
It is flowed into from the inflow entrance in the Room the 1st and the side in the Room the 2nd is reached by the through hole
Exhaust flowed in the Room the 2nd in the way of bypassing the concavity and reach institute by the opposite side in the Room the 2nd
State outlet.
2. engine silencing according to claim 1, wherein,
The concavity is located between the outlet and the through hole.
3. engine silencing according to claim 1 or 2, wherein,
The concavity is relative with the inflow entrance.
4. engine silencing according to claim 3, wherein,
The inflow entrance is located at the top of the Room the 1st,
The concavity is received from the exhaust that the inflow entrance is flowed into the Room the 1st and guides it downwards.
5. according to engine silencing according to any one of claims 1 to 4, wherein,
There is the through hole in the horizontal side of the main part,
It is flowed into from the inflow entrance in the Room the 1st and the transverse direction in the Room the 2nd is reached by the through hole
The exhaust of side is flowed and via the described 2nd in the Room the 2nd in the way of the above and or below around the concavity
Indoor horizontal opposite side reaches the outlet.
6. according to engine silencing according to any one of claims 1 to 5, wherein,
The housing includes convex shaped part, and the convex shaped part is outstanding in the way of covering the outlet and with opening portion,
From the outlet to the opening portion, the exhaust channel of the tubulose of guiding exhaust is by the envelope in the bottom of the concavity
The part and the convex shaped part for having closed a part for the outlet are formed.
7. a kind of engine silencing, wherein,
The engine silencing includes：
The housing of box, it has the inflow entrance that the exhaust outlet and supply and discharge gas that are connected to engine flow into and by the exhaust flowed into
The outlet of discharge；
Demarcation strip, it will be divided into the Room the 1st comprising the inflow entrance and the Room the 2nd comprising the outlet in housing；
And
Limiting unit is flowed, it partly limits flowing of the exhaust in the Room the 2nd,
There is the through hole that at least one connects the Room the 1st with the Room the 2nd in the side of the demarcation strip,
It is flowed into from the inflow entrance in the Room the 1st and the side in the Room the 2nd is reached by the through hole
Exhaust flow and arrived via the opposite side in the Room the 2nd in the way of bypassing the flowing limiting unit in the Room the 2nd
Up to the outlet.
8. engine silencing according to claim 7, wherein,
The flowing restriction site is between the outlet and the through hole.
9. the engine silencing according to claim 7 or 8, wherein,
There is the through hole in the horizontal side of the demarcation strip,
It is flowed into from the inflow entrance in the Room the 1st and the transverse direction in the Room the 2nd is reached by the through hole
The exhaust of side is flowed and via institute in the Room the 2nd in the way of the above and or below around the flowing limiting unit
The horizontal opposite side stated in Room the 2nd reaches the outlet.
10. the engine silencing according to any one of claim 7~9, wherein,
The flowing limiting unit is a part for a part either housing of the demarcation strip.
11. the engine silencing according to any one of claim 7~9, wherein,
The flowing limiting unit is in the Room the 2nd between the housing and the demarcation strip.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016087945A JP2017198112A (en) | 2016-04-26 | 2016-04-26 | Engine muffler |
| JP2016-087945 | 2016-04-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107313833A true CN107313833A (en) | 2017-11-03 |
| CN107313833B CN107313833B (en) | 2020-06-05 |
Family
ID=60021136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710134022.0A Active CN107313833B (en) | 2016-04-26 | 2017-03-08 | Silencer for engine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20170306817A1 (en) |
| JP (1) | JP2017198112A (en) |
| CN (1) | CN107313833B (en) |
| DE (1) | DE102017001983A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6457553B1 (en) * | 2000-08-04 | 2002-10-01 | Nelson Industries, Inc. | Low cost muffler |
| EP1584800A1 (en) * | 2004-04-07 | 2005-10-12 | HONDA MOTOR CO., Ltd. | Engine exhaust muffler with exhaust emission control function |
| CN104088698A (en) * | 2014-07-14 | 2014-10-08 | 江苏台普动力机械有限公司 | Silent diesel generator set structure |
| CN102482966B (en) * | 2009-09-14 | 2015-06-17 | 本田技研工业株式会社 | Exhaust muffler for multipurpose engine |
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|---|---|---|---|---|
| US3029895A (en) * | 1958-03-12 | 1962-04-17 | Lyon Inc | Muffler structure |
| US3650354A (en) * | 1971-04-12 | 1972-03-21 | Briggs & Stratton Corp | Muffler for internal combustion engines |
| US3968854A (en) * | 1975-03-18 | 1976-07-13 | Briggs & Stratton Corporation | Low noise level muffler for small engines |
| DE2643240A1 (en) * | 1976-09-25 | 1978-04-06 | Stihl Maschf Andreas | SILENCERS, IN PARTICULAR FOR PORTABLE MOTOR CHAIN SAWS |
| JPH06575Y2 (en) * | 1988-06-16 | 1994-01-05 | 川崎重工業株式会社 | Muffler for internal combustion engine |
| JP2581164Y2 (en) * | 1991-03-26 | 1998-09-21 | 株式会社共立 | Muffler with catalyst |
| JP2578330Y2 (en) * | 1992-02-10 | 1998-08-13 | 株式会社共立 | Exhaust muffler structure of internal combustion engine |
| DE29609405U1 (en) * | 1996-05-25 | 1996-08-14 | Fa. Andreas Stihl, 71336 Waiblingen | Exhaust silencer for internal combustion engines |
| JP2989791B2 (en) * | 1997-11-19 | 1999-12-13 | 川崎重工業株式会社 | Small general-purpose engine muffler |
| US6076632A (en) * | 1998-12-14 | 2000-06-20 | Nelson Industries, Inc. | Cross flow baffle muffler |
| US8132646B2 (en) * | 2003-08-06 | 2012-03-13 | Andreas Stihl Ag & Co. Kg | Exhaust gas muffler |
| US7156202B2 (en) * | 2004-04-05 | 2007-01-02 | Mtd Products Inc | Method and apparatus for venting exhaust gas from an engine |
| DE202005007861U1 (en) * | 2004-06-17 | 2005-11-03 | Dolmar Gmbh | Mäanderkatalysator |
| DE202006013382U1 (en) * | 2006-08-31 | 2008-01-03 | Dolmar Gmbh | Multi-shell silencer / Hinderschalenkanal |
| US8251173B2 (en) * | 2009-07-23 | 2012-08-28 | Briggs & Stratton Corporation | Muffler attachment system |
| US8485313B2 (en) * | 2010-06-18 | 2013-07-16 | Briggs & Stratton Corporation | Muffler and engine system |
| JP6190603B2 (en) | 2013-03-18 | 2017-08-30 | 株式会社マキタ | Muffler device and portable work machine |
-
2016
- 2016-04-26 JP JP2016087945A patent/JP2017198112A/en active Pending
-
2017
- 2017-02-03 US US15/423,876 patent/US20170306817A1/en not_active Abandoned
- 2017-03-01 DE DE102017001983.5A patent/DE102017001983A1/en not_active Withdrawn
- 2017-03-08 CN CN201710134022.0A patent/CN107313833B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6457553B1 (en) * | 2000-08-04 | 2002-10-01 | Nelson Industries, Inc. | Low cost muffler |
| EP1584800A1 (en) * | 2004-04-07 | 2005-10-12 | HONDA MOTOR CO., Ltd. | Engine exhaust muffler with exhaust emission control function |
| US20050224284A1 (en) * | 2004-04-07 | 2005-10-13 | Syuji Ohno | Engine exhaust muffler with exhaust emission control function |
| CN102482966B (en) * | 2009-09-14 | 2015-06-17 | 本田技研工业株式会社 | Exhaust muffler for multipurpose engine |
| CN104088698A (en) * | 2014-07-14 | 2014-10-08 | 江苏台普动力机械有限公司 | Silent diesel generator set structure |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102017001983A1 (en) | 2017-10-26 |
| CN107313833B (en) | 2020-06-05 |
| JP2017198112A (en) | 2017-11-02 |
| US20170306817A1 (en) | 2017-10-26 |
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