DE112020004147T5 - Air filter with throttle valve - Google Patents

Abstract

An air filter (8) filters air (A) that is supplied to an engine (E). The air cleaner (8) comprises: an intake duct (24) which introduces the air (A) from a clean room chamber (37) into the engine (E); a throttle valve (62) which opens and closes the intake port (24) and includes a valve body (64) which comes into contact with and moves away from an inlet end edge (24a) of the intake port (24); and a pressing element (74) which presses the valve body (64) of the throttle valve (62) against the inlet end edge (24a) in a closed valve position.

Description

CROSS REFERENCE TO RELATED APPLICATION

This application is based on Japanese Patent Application No. 2019-159814 , filed September 2, 2019, the entire disclosure of which is incorporated by reference as part of this application.

BACKGROUND OF THE INVENTION

field of invention

The present invention relates to an air cleaner with a throttle valve that opens and closes a passage for air supply to an engine.

Description of the prior art

There are known air cleaners that filter the air to be supplied to the engines and in which throttle valves open and close the intake passages for the air to be supplied to the engines (see, for example, Patent Documents 1 and 2). Filter housings and throttle valves are often made of a single plastic, so that size differences, distortion, etc. can prevent the throttle valves from closing completely and leave gaps. If there are such gaps, the valves may not work.

Related Documents

patent documents

• Patent Document 1: Japanese Patent Publication No. 6386438,
• Patent Document 2: Japanese Laid-Open Patent Publication No. 2018-091145.

In Patent Document 1, paragraph [0005] describes that a throttle valve is pressed by a baffle plate and/or a filter cover to improve the sealing of the throttle valve. However, since such a baffle plate and a filter cover are also made of a plastic, the throttle valve cannot function satisfactorily in a case where these components have large differences in their product sizes. In Patent Document 2, a throttle valve is brought into line contact with a filter case to improve sealing. However, if the throttle valve itself has a large warpage, the sealing will be impaired.

SUMMARY OF THE INVENTION

The object of the present invention is to provide an air filter with a throttle valve which has improved sealing.

To solve this problem, an air cleaner with a throttle valve according to the present invention is provided. The air cleaner filters air to be supplied to an engine, the air cleaner comprising: an intake duct that introduces the air from a clean room chamber into the engine; a throttle valve that opens and closes the intake port and includes a valve body that comes into contact with and moves away from an inlet end edge of the intake port; and a pressing member that presses the valve body of the throttle valve against the inlet end edge in a closed valve position.

According to this structure, the valve body of the throttle valve is pressed against the inlet end edge of the intake port by the pressing member in the closed position of the valve. This eliminates a gap between the throttle valve and the inlet edge of the intake port, so that the sealing of the throttle valve is improved.

In the present invention, a baffle plate that prevents fuel from splashing back from the intake passage may be fixed to a filter case defining the clean room chamber, and a valve space may be defined between the filter case and the baffle plate, the valve space accommodating the valve body when the throttle valve is closed. This configuration makes it possible to prevent the fuel from splashing back and improve the sealing of the valve body with a simple structure.

In a case where the baffle plate is fixed to the housing of the filter, the pressing member may be attached to the baffle plate. In this embodiment, the pressure member is securely fixed to the high-rigidity baffle plate, so that the pressure member is stably attached.

In the present invention, the pressing member may include a locking member placed in contact with the filter case or the baffle plate to prevent rotation of the pressing member. In this embodiment, the pressing member is prevented from rotating when the throttle valve is rotated, so that the pressing member is held stably.

In a case where the baffle plate is fixed to the filter case, the baffle plate and the pressing member can be fixed by a common fastening flow element must be attached to the filter housing. This construction improves the attachment of the deflector plate and the pressure element while reducing the number of components.

In the present invention, the intake passage may include: an air passage into which the air flows and an air-fuel mixture passage into which an air-fuel mixture of air and fuel flows, and the valve body may be connected to the inlet end edges of both the air passage and the air-fuel mixture passage come into contact when the throttle valve is closed. According to this configuration, the air cleaner of the present invention can be suitably used for a stratified scavenging engine.

In the present invention, the throttle valve may include: a rotary member that rotatably supports the valve body; a connecting part that connects the valve body to the rotary part; and a lever externally coupled to the rotary member and rotating the valve body upon application of an external operating force. Because of this nature, the throttle valve can be constructed with a simple structure.

In the present invention, the valve body may have a reinforcing rib on a second side of the valve body, which is located opposite to a first side of the valve body that comes into contact with the inlet end edge. With this configuration, the valve body can be effectively reinforced.

The present invention includes any combination of at least two features disclosed in the claims and/or the description and/or the drawings. In particular, any combination of two or more of the appended claims should be equally construed as included within the scope of the present invention.

character list

• 1 ist eine Frontansicht eines Motors mit einem Luftfilter mit Drosselventil gemäß einem ersten Ausführungsbeispiel der vorliegenden Erfindung;
• 2 ist ein Schnitt in Längsrichtung eines Ansaugsystems des Motors;
• 3 ist eine perspektivische Explosionsdarstellung des Luftfilters;
• 4 ist eine Vorderansicht eines Filtergehäuses für den Luftfilter;
• 5 ist eine Querschnittsansicht entlang der Linie V-V in 4;
• 6 ist eine Querschnittsansicht entlang der Linie VI-VI in 4;
• 7 ist eine vergrößerte Ansicht von Teil VII in 5;
• 8 ist eine perspektivische Ansicht eines Druckelements des Luftfilters; und
• 9 ist eine Vorderansicht, die das Druckelement und einen Ventilkörper des Drosselventils zeigt.

The present invention will be more clearly understood from the following description of preferred embodiments in conjunction with the accompanying drawings. However, the embodiments and drawings are given for purposes of illustration and explanation only and are not to be construed as limiting the scope of the present invention in any way, the scope of which is to be determined by the appended claims. In the accompanying drawings, the same reference numbers are used to designate the same or corresponding parts throughout the different views:

• 1 12 is a front view of an engine having a throttle valve type air cleaner according to a first embodiment of the present invention;
• 2 Fig. 12 is a longitudinal section of an intake system of the engine;
• 3 Fig. 14 is an exploded perspective view of the air cleaner;
• 4 Fig. 14 is a front view of a filter case for the air cleaner;
• 5 is a cross-sectional view taken along line VV in FIG 4 ;
• 6 is a cross-sectional view taken along line VI-VI in FIG 4 ;
• 7 is an enlarged view of Part VII in 5 ;
• 8th Fig. 14 is a perspective view of a pressing member of the air cleaner; and
• 9 Fig. 14 is a front view showing the pressing member and a valve body of the throttle valve.

DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

A preferred embodiment of the present invention will be described below with reference to the drawings. In the present specification, a “front-rear direction” means an axial direction of a crankshaft of an engine; a “top-bottom direction” means an axial direction of a cylinder bore; and a “left-right direction” means a direction perpendicular to both the front-back direction and the top-bottom direction. An “upstream” side and a “downstream” side refer to an upstream side and a downstream side of the flow direction of intake air (or simply air), respectively. The following embodiment is described using the example of a compact two-stroke engine for a grass trimmer. However, the present invention can also be applied to other compact power tools such as hedge trimmers and chain saws.

1 12 is a front view of an engine including an air cleaner with a throttle valve according to a first embodiment of the present invention. In 1 For example, the two-cycle engine E comprises a crankcase in which the crankshaft 2 is rotatably supported, and a cylinder 4 connected to an upper part of the crankcase. The cylinder 4 integrally includes a cylinder head. Inside the crankcase 2 is a crank chamber 2a ( 2 ) and inside the cylinder 4 is a combustion chamber 4a ( 2 ) educated.

A fuel supply device 6 and an air cleaner 8 of an intake system are connected to one side of the cylinder 4 (left side in 1 ) connected in the left-right direction. A muffler 10 of an exhaust system is connected to the other side of the cylinder 4 (right side in 1 ) connected in the left-right direction. A carburetor is used as the fuel supply device 6 in the present embodiment. However, the fuel supply device 6 is not limited to a carburetor, and may be implemented with, for example, a fuel injector (fuel injector) and a throttle valve disposed upstream of the fuel injector. The structure of the air cleaner 8 will be described later. A fuel tank is attached to a lower portion of crankcase 212 . The cylinder 4 and the muffler are covered by a cover 1410.

As in 2 As shown, inside the cylinder 4 is defined a cylinder bore 4b. A piston 16 reciprocatingly moves in the axial direction C1 (up-down direction) is fitted in the cylinder bore 4b. The combustion chamber 4a is delimited by an upper side of the piston 16 and the cylinder bore 4b. An insulator 18 is arranged between the cylinder 4 and the fuel supply device 6 . The insulator 18 consists of a heat-insulating material, such as. B. a plastic, and is arranged to thermally insulate the high-temperature cylinder 4 . The insulator 18 has a first threaded hole (not shown) open in the left-right direction (in 2 to the left).

The intake system includes an air duct 20 and an air-fuel mixture duct 22 communicating with the cylinder 4 . The air passage 20 and the air-fuel mixture passage 22 are parallel to each other, with the air passage 20 being arranged in an upper part of the intake system and the air-fuel mixture passage 22 being arranged in a lower part of the intake system. The air duct 20 and the air-fuel mixture duct 22 are designed as an intake duct 24 . Both the air duct 20 and the air-fuel mixture duct 22 include an upstream part in the carburetor (fuel supply device 6) and a downstream part in the insulator 18. The air duct 20 and the air-fuel mixture duct 22 are Air A supplied, which is filtered by the air filter 8. In the air-fuel mixture passage 22 within the fuel supply device 6, fuel F is introduced into the air A to generate an air-fuel mixture M.

The air-fuel mixture passage 22 includes an intake port 22 a which is open on an inner peripheral surface of the cylinder 4 . The cylinder 4 includes a scavenging port 26a which is located on a peripheral wall of the cylinder 4 and introduces the air-fuel mixture M from a scavenging passage 26 into the combustion chamber 4a. An exhaust port 28 a of an exhaust port 28 is open on the inner peripheral surface of the cylinder 4 . The exhaust port 28a is located opposite to the intake port 22a within the cylinder bore 4b on the peripheral wall of the cylinder 4 with respect to the axial direction C1. The exhaust (combustion gas) from the exhaust passage 28 is exhausted through the muffler 10 ( 1 ) derived to the outside.

A reed valve 30 is attached to an outlet downstream of the air duct 20 in the isolator 18 . The reed valve 30 closes the air passage 20 when the pressure in a communication passage 32 connected to the crank chamber 2a rises to a predetermined value or more. That is, when the reed valve 30 opens, the air A from the air passage 20 is introduced into an upper part of the scavenging passage 26 via the connecting passage 32 .

In the case of air intake, in which the piston 16 moves upwards, as in 2 shown with a double-dashed line, the air-fuel mixture M from the air-fuel mixture passage 22 is introduced directly from the intake port 22a into the crank chamber 2a under negative pressure in the crank chamber 2a. On the other hand, the air A from the air passage 20 is introduced into the upper part of the scavenging passage 26 for a while when sucking air from the connecting passage 32 under negative pressure in the crank chamber 2a.

During the flushing process, in which the piston 16 moves downwards, as in 2 represented by a solid line, the air-fuel mixture M introduced into the crank chamber 2a is blown from the scavenging port 26a via the scavenging passage 26 into the combustion chamber 4a. In this process, the air A collected in the upper part of the scavenging passage 26 is blown into the combustion chamber 4a ahead of the air-fuel mixture M.

The structure of the air cleaner 8 will be described. The air filter 8 includes a filter housing 36 connected to the fuel supply device 6 and a filter cap 38 fixed to the filter housing 36 . The filter cap 38 is secured by a screw 41 ( 3 ) removably attached to the filter housing 36. The air filter 8 is attached together with the fuel supply device 6 by fasteners 55 ( 3 ), e.g. B. screws on the insulator 18 attached.

In the present exemplary embodiment, the filter housing 36 and the filter cap 38 are molded parts made of a plastic. The filter housing 36 has a substantially rectangular shape, when viewed in the right-left direction. The filter cap 38 has the shape of a cup which is open at the side of the filter case 36 . However, the material and shapes of the filter case 36 and the filter cap 38 are not limited to those of the present embodiment. The filter housing 36 and the filter cap 38 form an air filter chamber 39 in their interior.

A filter element 40 is arranged inside the air filter chamber 39 . The filter element 40 consists z. B. made of urethane or felt and filters the air to be supplied to the engine E. That is, in the air filter chamber 39, there is a dirt chamber 35 upstream and a clean room 37 downstream with respect to the filter element 40. The air A introduced into the air filter chamber 39 passes through the filter element 40 for filtering, and then is supplied to the engine E by the fuel supply device 6 . The material of the filter element 40 is not limited to the above examples. In the present exemplary embodiment, the filter cap 38 covers the filter housing 36 and the filter element 40 .

The filter housing 36 includes a first filter outlet 42 and a second filter outlet 44, which are arranged side by side in the top-bottom direction. In particular, the first filter outlet 42 is arranged above the second filter outlet 44 . The first filter outlet 42 communicates with the air passage 20. The second filter outlet 44 communicates with the air-fuel mixture passage 22. FIG. The first filter outlet 42 serves as an inlet of the air passage 20 (intake passage 24), and the second filter outlet 44 serves as an inlet of the air-fuel mixture passage 22 (intake passage 24). That is, the intake duct 24 introduces the air A into the engine E from the clean room chamber 37 .

The filter housing 36 includes a return fuel collection portion 46 which is connected to the air/fuel mixture passage 22 . That is, the return fuel collection part 46 is arranged upstream of the fuel supply device 6 and connected to the air-fuel mixture passage 22 of the fuel supply device 6 . Specifically, the return fuel collection part 46 protrudes toward an upstream side of the second filter outlet 44 of the filter case 36 . The return fuel collection portion 46 includes at its projecting end a rising wall 46a extending upward. In the present embodiment, the return fuel collection part 46 is formed integrally with the filter case 36 by an injection molding process.

As in 3 As shown, the filter case 36 includes first projections 48 each having a cylindrical shape on a bottom surface 36a (ie, on a motor-facing surface) of the filter case 36. As shown in FIG. The first projections 48 are also made in one piece with the filter housing 36 by an injection molding process. There are two such first projections 48 located side by side on opposite sides of the second filter outlet 44 in the front-to-back direction. Each first projection 48 has an axis extending in the left-right direction and includes a screw insertion hole 48a oriented in the left-right direction.

A second projection 50 is located at a frontal position with respect to the first projections 48 on the bottom surface 36a of the filter housing 36, as shown in FIG 6 shown. The second projection 50 is also made in one piece with the filter housing 36 by an injection molding process. The second projection 50 also has an axis extending in the left-right direction and includes a through hole 50a oriented in the left-right direction. Furthermore, the filter housing 36 includes a plurality of ribs 52 which extend radially on the bottom surface 36a, as shown in FIG 3 shown.

The filter case 36 includes a lever stop portion 54 on a front surface 36b of the filter case 36. The lever stop portion 54 projects to the right (engine side) from the front surface 36b of the filter case 36 and includes a through groove 54a formed in the top-bottom direction extends. The lever limiting portion 54 is also formed integrally with the filter case 36 by an injection molding process.

A baffle 56 is attached to the filter housing 36 . The baffle 56 prevents the fuel F from splashing back from the intake passage 24 (air-fuel mixture passage 22). The baffle 56 is connected to the first fasteners 55, z. B. screws, on the first projection 48 of the filter housing 36 attached.

The baffle 56 is a bent metal sheet. Specifically, the baffle 56 includes a U-shaped main body 58. The main body 58 has a U-shape which is open on the right side (the engine side). The main body 58 includes a top wall 58a having a second left-right oriented threaded hole 58b. In the present embodiment, the second threaded hole 58b is defined by a weld nut. The second threaded hole 58b is screwed with a bolt 41 inserted from the outside of the filter cap 38 .

The main body 58 includes a pair of front and rear side walls 58c and fasteners connecting pieces 60 located at the pointed ends of the side walls 58c. Each fastening piece 60 has a main surface oriented in the left-right direction and is formed by bending a tip end of one of the pair of side walls 58c outward in the front-rear direction. Each attachment part 60 includes a first insertion hole 60a aligned in the left-right direction. The first fasteners 55 are first inserted from the left side (from the side opposite to the engine) into the first insertion holes 60a and then into the screw insertion holes 48a of the first bosses 48 of the filter case 36 to be attached to the first threaded holes (not shown) of the insulator 18 to be attached. In this manner, baffle 56 is removably attached to filter housing 36 .

As in 4 As shown, with the baffle plate 56 attached to the filter housing 36, the air-fuel mixture passage 22 is closed by the rising wall 46a of the return fuel collection portion 46 and the top wall 58a of the main body 58 of the baffle plate 56, as viewed from the outside in left -right direction (from the side opposite to the engine). This prevents the fuel from splashing back from the air-fuel mixture passage 22 . The collected fuel F collects in the return fuel collection portion 46 and is returned to the engine E through the air-fuel mixture passage 22 together with the air A. FIG. In this state, as in 5 1, a space SP1 is defined in the front-to-back direction between the filter case 36 and the baffle plate 56. As shown in FIG.

As in 4 As shown, the air cleaner 8 includes a throttle valve 62 that opens and closes the intake passage 24 . The throttle valve 62 is made of a plastic and includes: a valve body 64 that opens and closes the intake passage 24, and a rotary member 66 that supports the valve body 64 rotatably. The material of the throttle valve 62 is not limited to plastic. The throttle valve 62 further includes: a connecting part 68 connecting the valve body 64 to the rotating part 66; and a lever 70 externally coupled to the rotary member 66 and rotating the valve body 64 upon application of an external operating force.

The valve body 64 is made of a resin and is inserted into the space SP1 when the valve is closed. That is, the space SP1 between the filter case 36 and the baffle plate 56 as shown in FIG 5 shown serves as a valve space into which the valve body 64 is inserted when the valve is closed. The valve body 64 comes into contact with an inlet end edge 24a of the inlet port 24 to close the inlet port 24 and moves away from the inlet end edge 24a to open the inlet port 24 . In the present embodiment, when the throttle valve 62 is closed, a first side 64a of the valve body 64 contacts both the inlet end edges 24a of the air passage 20 and the air-fuel mixture passage 22 . As in 4 As shown, the valve body 64 includes a reinforcing rib 65 on a second side 64b opposite the first side 64a.

As in 3 As shown, the rotating member 66 in the present embodiment is a tubular member having a closed end. The lever 70 includes: a base portion 70a, which is supported by the filter case 36, and a tip end portion 70b, which receives an external operating force. The lever 70 includes a second insertion hole 70c on the base portion 70a.

As in 6 As shown, the lever 70 is inserted into the through groove 54a of the lever limiting member 54 from the first side. Further, the rotary part 66 of the throttle valve 62 is inserted into the through hole 50a of the second projection 50 of the filter case 36 and the second insertion hole 70c of the lever 70 from the left side (from the side opposite to the engine). In this state, a fastener 72, z. a self-tapping screw, is screwed into a hollow hole 66a of the rotary tubular member 66 from the right side (engine side) and fixed to the rotary member 66 . In this way, the throttle valve 62 is rotatably supported around the rotary member 66, with the throttle valve 62 being locked to a head portion of the rotary member 66 so that it cannot fall off.

When the lever 70 is in the in 4 is brought into a state shown by a solid line, that is, when the lever 70 is operated upward (in a direction D1), the valve body 64 of the throttle valve 62 is closed. If, on the other hand, the lever 70 is in the in 4 shifted to the state shown by a double-dashed line, that is, when the lever 70 is operated downward (in the direction D2), the valve body 64 of the throttle valve 62 is opened.

The air filter 8 also includes a pressure element 74 which presses the valve body 64 of the throttle valve 62 against the inlet end edge 24a of the intake passage 24 in a closed valve position. How out 3 As can be seen, the pressure element 74 is a bent sheet metal. In particular, the pressing member 74 is a thinner sheet metal than the baffle plate 56. Therefore, the pressing member 74 is easily elastically deformed.

In the present embodiment, the pressure element 74 is on the baffle plate 56 fastened. In particular, the baffle plate 56 and the pressure member 74 are attached to the filter housing 36 by a common fastener 55 . The pressing member 74 has a third insertion hole 76a in a mounting part 76 of the pressing member 74 . The fastener 55 is sequentially inserted into the third insertion hole 76a of the pressing member 74 and the first insertion hole 60a of the baffle plate 56 and passed through the screw insertion hole 48a of the first projection 48 to be fixed to the first threaded hole (not shown) of the insulator 18. In this way, the baffle plate 56 and the pressure member 74 are detachably attached together to the filter housing 36 by the fastener 55 .

As in 8th As shown, the pressing member 74 includes a pressing portion 78 above the mounting portion 76. The pressing portion 78 includes: a middle portion 78a which is recessed from an upper edge of the mounting portion 76 to the right (engine side) and extends upward; and a holding portion 78b slightly raised to the left (toward the engine side) and extending forward from a front edge of the middle portion 78a. The holding portion 78b is arranged so as to be different in the side view of FIG 4 with the inlet port 24 ( 5 ) overlaps and comes into contact with the valve body 64 in the closed position of the valve.

As in 8th As shown, the holding portion 78b includes an upper edge bent to incline to the left as the first guide part 78c. In addition, the holding portion 78b includes a lower edge bent to incline leftward as the second guide part 78d. As in 9 1, a gap between the holding portion 78b and the filter case 36 has a gap dimension L1 that is slightly smaller than a thickness dimension L2 of the valve body 64 of the throttle valve 62 (L1<L2).

Accordingly, in a closing operation in which the valve body 64 is moved in the arrow direction A1, the valve body 64 is guided by the first guide part 78c and moved downward while the holding portion 78b is pushed up to come into a closed state, as in FIG 7 shown. Since the pressing member 74 is a thin sheet metal, the pressing member 74 is easily elastically deformed, so that the valve body 64 can move and is pressed against the inlet end edge 24a of the intake port 24 by a restoring force of the pressing member 74 . In addition, since the holding portion 78b has the second guide part 78d at the lower edge, the movement of the valve body 64 is further facilitated. The valve body 64 has a small opening 64c, which opens into the air/fuel mixture channel 22, so that when the valve is closed, a small amount of air is introduced into the air/fuel mixture channel 22.

The pressure element 74 also contains a locking part 80, as in FIG 8th shown. The locking part 80 is in contact with the in 4 The filter housing 36 shown is arranged to prevent the pressure element 74 from rotating. This in 8th The pressing member 74 shown includes a lower edge of the fixing part 76 bent to the left (to the side opposite to the engine) as the first locking part 81. The pressing member 74 includes a rear edge of a lower portion of the fixing part 76 bent to the right (to the side of the motor) is bent, as the second locking part 82.

As in 4 As shown, the first locking member 81 with the pressing member 74 fixed to the filter case 36 is in contact with a rear surface 46b of the return fuel collection portion 46 of the filter case 36. This prevents the pressing member 74 from moving downward (towards a closing operation of the valve body 64). In addition, the second locking part 82 is in contact with a lower side of the rib 52 on the inner surface of the filter case 36. This prevents the pressing member 74 from moving upward (toward an opening operation of the valve body 64).

A method of assembling the air cleaner 8 of the present embodiment will be described. First, the throttle valve 62 with an in 3 Fastening element 72 shown is rotatably attached to the filter housing 36 . Then, the baffle plate 56 and the pressure member 74 are detachably secured to the filter housing 36 with the fasteners 55 . Thereafter, the bolt 41 is inserted into the bolt insertion hole 38a of the filter cap 38 and the bolt insertion hole 40a of the filter element 40 from the left side (non-engine side) in sequence, and fixed to the second threaded hole 58b of the baffle plate 56 . The air filter 8 is thus assembled.

The operation of the air cleaner 8 including the throttle valve 62 according to the present embodiment will now be described. When starting the in 2 Engine E shown, the air A and the air-fuel mixture M are passed through the air cleaner 8 and the fuel supply device 6 into the combustion chamber 2a. When starting the engine E, a high proportion of air can lead to a deterioration in the ignition behavior (starting behavior). For this reason, the in 4 Lever 70 shown is actuated to close the throttle valve 62 ßen and thus largely shut off the inflow of air A.

At the same time, the pressure element 74 presses the valve body 64 of the throttle valve 62 in the closed position against the in 5 shown inlet end edge 24a of the inlet passage 24. This eliminates the gap between the throttle valve 62 and the inlet end edge 24a of the inlet passage 24, so that the sealing of the throttle valve 62 is improved. Thereby, it is possible to prevent the ignition performance from deteriorating when the engine is started.

When the valve is closed, the valve body 64 is inserted into the space SP1 between the filter case 36 and the baffle plate 56 to prevent the fuel F from splashing back.

In the 4 The deflector plate 56 shown and the pressure element 74 are fastened together to the filter housing 36 by the fastening element 55 . This improves the attachment of the baffle plate 56 and the pressure member 74 and reduces the number of parts. In addition, since the pressing member 74 is securely fixed to the highly rigid baffle 56, the pressing member 74 is stably attached.

In addition, since the pressing member 74 includes the locking member 80, the pressing member 74 is prevented from rotating when the throttle valve 62 is rotated. As a result, the pressing member 74 is held stably.

the inside 5 The intake passage 24 shown includes the air passage 20 in which the air flows and the air-fuel mixture passage 22 in which the air-fuel mixture M flows. When the throttle valve 62 is closed, the valve body 64 comes into contact with the inlet end edges 24a (20a, 22a) of both the air passage 20 and the air-fuel mixture passage 22. FIG. Thus, the air cleaner 8 according to the present embodiment can be suitably applied to a stratified scavenging engine.

This in 4 The throttle valve 62 shown in FIG. In addition, the valve body 64 includes the reinforcing rib 65 on the second side 64b, so that the valve body 64 can be effectively reinforced.

The present invention is not limited to the above embodiment, and various additions, changes, or deletions can be made without departing from the scope of the invention. For example, the locking part 80 of the in 4 For example, the pressure member 74 shown placed in contact with the filter housing 36 to prevent the pressure member 74 from rotating in the above embodiment may instead be placed in contact with the baffle plate 56 to prevent the pressure member 74 from rotating. Furthermore, the air cleaner 8 according to the present invention can be applied to engines other than stratified scavenging engines. Accordingly, such variants also fall within the scope of protection of the present invention.

Reference List

8th

air filter

20

air passage

22

Air-fuel mixture duct

24

intake duct

24a

Inlet end edge of intake duct

36

filter housing

37

clean room chamber

55

first fastener

56

baffle plate

62

throttle valve

64

valve body

65

reinforcing rib

66

turned part

68

connection part

70

lever

74

pressure element

80

locking part

A

Air

E

engine

f

fuel

SP1

room (valve room)

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• JP 2019159814 [0001]

Claims (8)

Air filter that filters air to be supplied to an engine, the air filter comprising: an intake duct that introduces the air from a clean room chamber into the engine; a throttle valve that opens and closes the intake port and has a valve body that comes into contact with and moves away from an inlet end edge of the intake port; and a pressure element that presses the valve body of the throttle valve against the inlet end edge in a closed valve position. air filter after claim 1 wherein a baffle plate that prevents fuel from splashing back from the intake passage is fixed to a filter housing defining the clean room chamber, and a valve space is defined between the filter housing and the baffle plate, the valve space accommodating the valve body when the throttle valve is closed . air filter after claim 2 , wherein the pressure element is fixed to the baffle. air filter after claim 2 or 3 wherein the pressure element has a locking part which is arranged in contact with the filter housing or the baffle plate to prevent rotation of the pressure element. Air filter after one of claims 2 until 4 wherein the baffle plate and the pressure member are attached to the filter housing by a common fastener. Air filter after one of Claims 1 until 5 wherein the intake passage comprises: an air passage into which the air flows; and an air-fuel mixture passage in which an air-fuel mixture of air and fuel flows, and wherein the valve body comes into contact with the inlet end edges of each of the air passage and the air-fuel mixture passage when the throttle valve is closed . Air filter after one of Claims 1 until 6 wherein the throttle valve comprises: a rotary member rotatably supporting the valve body; a connecting part that connects the valve body to the rotary part; and a lever externally coupled to the rotary member and rotating the valve body upon application of an external operating force. Air filter after one of Claims 1 until 7 , wherein the valve body has a reinforcing rib on a second side of the valve body, which is arranged opposite to a first side of the valve body, which comes into contact with the inlet end edge.

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