JP6265060B2 - Air cleaner for internal combustion engine - Google Patents

Description

  The present invention relates to an air cleaner for an internal combustion engine in, for example, a motorcycle.

  In an intake system of an engine (internal combustion engine) in a motorcycle or the like, an air cleaner is provided to remove dust from air supplied to the engine. In some motorcycles, a resonator (silencer) is formed inside the air cleaner or attached to the outside of the air cleaner in order to reduce intake noise. Patent Document 1 below describes an example in which a resonator is formed inside an air cleaner.

JP 2014-34966 A

  However, the resonator has a structure that creates an air flow in a direction different from the direction of air flow from the air cleaner inlet to the engine through the air cleaner, or is arranged to create such an air flow. ing. For this reason, by providing the resonator, there is a problem that the flow of air from the air cleaner inlet to the engine is obstructed, the intake resistance increases, and the engine output decreases.

  Further, when the resonator is formed inside the air cleaner, there is a problem that the air cleaner capacity is reduced by the formation of the resonator and the dust removing effect of the air cleaner is lowered.

  In addition, when the resonator is attached to the outside of the air cleaner, there are problems that the manufacturing cost increases, the weight increases, or the layout of the air cleaner (such as the arrangement of the air cleaner and its peripheral components) is restricted.

  The present invention has been made in view of, for example, the above-described problems, and an object of the present invention is to provide an air cleaner for an internal combustion engine that can reduce intake noise without providing a resonator.

In order to solve the above problems, an air cleaner for a first internal combustion engine according to the present invention communicates with a case, a partition that separates the inside of the case into an upstream intake chamber and a downstream intake chamber, and the upstream intake chamber. A suction port, a filter provided in the partition wall, for purifying air flowing from the suction port into the upstream intake chamber and going to the downstream intake chamber; provided in the upstream intake chamber; And an intake passage for restricting a flow range of air toward the filter .

Furthermore, in the air cleaner of the first internal combustion engine of the present invention, a passage forming member for forming the intake passage is provided in the upstream intake chamber, and the passage forming member is located upstream of the upstream intake chamber. A plate-like main plate portion that is divided into a space on the side and a space on the downstream side, an opening formed in the main plate portion, and extends from the main plate portion to the upstream side of the upstream intake chamber. A sub-plate portion that contacts a wall portion of the upstream intake chamber, and the intake passage is formed in a part of the upstream space of the upstream intake chamber by the passage forming member and the wall portion of the case. A tubular passage .

As described above, by providing the intake passage that regulates the air flow range in the chamber on the upstream side of the filter, the cross-sectional area of the flow route of the air sucked from the suction port can be adjusted, and the flow route of the air can be adjusted. Can be lengthened. As a result, it is possible to reduce intake noise without providing a resonator .

Further, since the intake passage can be formed along the air flow direction from the intake port toward the internal combustion engine, intake noise can be reduced without hindering the air flow. As a result, it is possible to reduce intake noise while suppressing a decrease in the output of the internal combustion engine .

Further, unlike the case where a resonator is provided, it is not necessary to provide a separate chamber for the air cleaner, so that a large air cleaner volume can be secured .

In addition, the intake passage can be formed at low cost, and the formation of the intake passage does not cause a significant increase in weight. Further, since the intake passage is provided in the upstream intake chamber, it is possible to ensure the degree of freedom of the air cleaner layout .

In addition , the intake passage can be easily formed by forming the passage forming member as an independent member different from the case and attaching it to the upstream intake chamber of the case. In addition, since the passage forming member is a member different from the case, the degree of freedom in designing the shape of the intake passage is increased. Thereby, it becomes easy to change the shape of the plate portion or the area of the opening, and by making such a change, it becomes possible to easily adjust the output or noise reduction effect of the internal combustion engine.

Further, the air cleaner for the second internal combustion engine of the present invention is the air cleaner for the first internal combustion engine of the present invention described above, wherein the area of the opening of the passage forming member is based on the cross-sectional area of the intermediate portion of the intake passage. Is also large.

  As a result, it is possible to suppress a decrease in the output of the internal combustion engine without hindering the flow of air from the suction port to the internal combustion engine.

Further, the air cleaner for the third internal combustion engine of the present invention is arranged such that the opening of the passage forming member faces the central portion of the filter in the air cleaner of the first or second internal combustion engine of the present invention described above. It is characterized by being.

  Thereby, the dust removal effect of the filter can be enhanced, and the purification efficiency of the intake air can be improved.

An air cleaner for an internal combustion engine according to a fourth aspect of the present invention is the above-described air cleaner for an internal combustion engine according to any one of the first to third aspects of the present invention, wherein the bottom surface of the upstream intake chamber projects toward the upstream intake chamber. When the air cleaner is mounted above the internal combustion engine at a position corresponding to the convex portion on the outer bottom surface of the case, other parts are placed between the air cleaner and the internal combustion engine. It is characterized in that a concave portion is formed for disposing.

  Thereby, sufficient space for arranging other components can be secured between the air cleaner and the internal combustion engine.

An air cleaner for a fifth internal combustion engine according to the present invention is the air cleaner for any one of the first to fourth internal combustion engines according to the present invention described above, wherein the intake passage is in the state where the air cleaner is attached to a vehicle body. Inclined from the front side to the rear side of the vehicle body.

  Thereby, a smooth flow of air from the suction port toward the internal combustion engine can be created, and a decrease in the output of the internal combustion engine can be suppressed.

  According to the present invention, it is possible to reduce intake noise without providing a resonator in the air cleaner.

It is a front view which shows the air cleaner by embodiment of this invention with an engine. It is a side view which shows the air cleaner by embodiment of this invention with an engine. It is a front view of the air cleaner by the embodiment of the present invention. It is a side view of the air cleaner by the embodiment of the present invention. It is a bottom view of the air cleaner by the embodiment of the present invention. It is sectional drawing of the air cleaner by embodiment of this invention seen from the arrow VI-VI direction in FIG. It is explanatory drawing which shows the state which removed the cap, the filter, etc. in the air cleaner by embodiment of this invention. FIG. 8 is an explanatory view showing a state where the passage forming member is further removed in the air cleaner in FIG. 7. It is a perspective view which shows the channel | path formation member in the air cleaner by embodiment of this invention. It is a top view of the passage formation member in the air cleaner by the embodiment of the present invention. It is sectional drawing of the channel | path formation member seen from the arrow XI-XI direction in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an air cleaner according to an embodiment of the present invention together with an engine (internal combustion engine). As shown in FIG. 1 or 2, in a motorcycle, an air cleaner 1 according to an embodiment of the present invention is a device that removes dust from air supplied to an engine 2, and is provided above a cylinder head 3 of the engine 2. Yes. Further, other parts such as a cut valve 5 and a hose 6 of the secondary air system are arranged between the air cleaner 1 and the cylinder head cover 4. The motorcycle in the present embodiment is, for example, a motorcycle of a naked type or a sports type, and the engine 2 is between the front and rear wheels of the motorcycle and is closer to the front than the middle in the front-rear direction of the motorcycle. It is arranged at the position and supported by the body frame.

  3 to 6 show the air cleaner 1. As shown in FIG. 3 or FIG. 4, the air cleaner 1 includes a substantially box-shaped case 11, and the case 11 includes a case main body 12 and a cap 13 that covers the upper side of the case main body 12. In the lower part of the front side of the case body 12, communication ports 14 are formed on the left side and the right side, respectively, for communicating the outside and the inside of the case body 12. The left communication port 14 is provided with a tubular introduction pipe portion 15 extending toward the lower left front of the motorcycle, and a suction port 16 is formed at the tip of the introduction tube portion 15. The right communication port 14 is provided with a tubular introduction pipe portion 15 that extends toward the lower right front of the motorcycle, and a suction port 16 is formed at the tip of the introduction tube portion 15. . Each suction port 16 communicates with the interior of the case 11 via the communication port 14 and the interior of the introduction pipe portion 15.

  Further, a concave portion 17 for arranging other components between the air cleaner 1 and the engine 2 is formed in the middle portion in the left-right direction at the front lower portion of the case body 12. As shown in FIG. 3, the concave portion 17 is formed on the bottom surface of the outer side of the case body 12, is recessed upward, and extends in the front-rear direction of the case body 12 as shown in FIG. 5. Further, the recess 17 is formed at a position corresponding to a later-described protrusion 29 formed inside the case 11. By forming the recess 17 in the case main body 12, when the air cleaner 1 is mounted above the engine 2, other parts are arranged between the air cleaner 1 and the engine 2 as shown in FIG. Sufficient space can be secured. The other parts are, for example, the cut valve 5 and the hose 6 of the secondary air system.

  Further, as shown in FIG. 6, a partition wall portion 23 that separates the inside of the case 11 into an upstream intake chamber 21 and a downstream intake chamber 22 is provided in the case 11 of the air cleaner 1. The upstream intake chamber 21 is located in the lower part of the case 11 and is located in the case main body 12. The downstream intake chamber 22 is located in the upper part of the case 11 and is mainly located in the cap 13. Further, each suction port 16 communicates with the inside of the upstream intake chamber 21 through the introduction pipe portion 15 and the communication port 14.

  Further, the partition wall portion 23 is formed with a filter mounting hole 24 that allows the upstream intake chamber 21 and the downstream intake chamber 22 to communicate with each other. The filter mounting hole 24 flows into the upstream intake chamber 21 from the suction port 16 and flows into the downstream intake chamber. A filter 25 that purifies the air that goes to the chamber 22 is provided. The upstream intake chamber 21 is arranged on the upstream side of the filter 25 and is called a dirty side because air before being purified by the filter 25 circulates. The downstream intake chamber 22 is arranged on the downstream side of the filter 25, and Since the air after being purified by 25 circulates, it is called a clean side.

  Further, an air funnel 26 connected to a throttle body in the engine 2 is provided in the downstream intake chamber 22.

  Further, as shown in FIG. 6, an intake passage 27 that restricts a flow range of air from the suction port 16 toward the filter 25 is provided in the upstream intake chamber 21. The intake passage 27 is provided on the left side and the right side so as to correspond to the two communication ports 14 in the upstream intake chamber 21.

  Each intake passage 27 includes a main plate portion 32 of the passage formation member 31, a sub plate portion 34 of the passage formation member 31, a convex portion 29 formed on the bottom surface of the upstream intake chamber 21, and a wall portion 28 of the case main body 12. And is formed in a substantially tubular shape. Such a configuration of each intake passage 27 is a diagram showing the air cleaner 1 in a state where the cap 13, the partition wall portion 23, and the filter 25 are removed, for convenience of explanation, and a view showing a state where the passage forming member 31 is removed from FIG. 8 and FIG. 9 to FIG. 11 showing the passage forming member 31 can be understood.

  More specifically, as shown in FIG. 8, a convex portion 29 projecting into the upstream intake chamber 21 is formed on the surface of the bottom wall 28 of the upstream intake chamber 21 (the bottom surface of the upstream intake chamber 21). Is formed. Further, as shown in FIG. 7, a passage forming member 31 formed as an independent member different from the case main body 12 is attached above the convex portion 29 in the upstream intake chamber 21.

  As shown in FIG. 9 or FIG. 11, the passage forming member 31 is formed in a substantially plate-shaped main plate portion 32 that expands so as to bisect the upstream intake chamber 21, and a substantially central portion of the main plate portion 32. An opening 33 and a substantially plate-like sub-plate portion 34 extending from the main plate portion 32 toward the bottom side of the upstream intake chamber 21 are provided. Furthermore, a fitting portion 35 is formed in a portion of the sub-plate portion 34 that is close to the bottom side of the upstream intake chamber 21. A plurality of attachment portions 36 are provided at the edge of the main plate portion 32.

  As shown in FIG. 7, when the passage forming member 31 is attached to the upstream intake chamber 21 via the attachment portions 36, the fitting portion 35 is fitted to the convex portion 29, and both approach or come into contact with each other. In this state, the end surface of the sub-plate portion 34 facing the bottom side of the upstream intake chamber 21 approaches or contacts the surface of the wall portion 28 on the bottom side of the upstream intake chamber 21. In this state, the peripheral edge portion of the main plate portion 32 approaches or contacts the wall portion 28 of the upstream intake chamber 21. Thus, two substantially tubular intake passages 27 are formed in the upstream intake chamber 21.

  Further, the upstream side of each intake passage 27 communicates with the communication port 14. Further, the two intake passages 27 merge on the downstream side thereof, and reach the vicinity of the filter 25 through the opening 33 of the passage forming member 31. The air sucked from the suction port 16 flows through each intake passage 27 and reaches the filter 25 as indicated by an arrow in FIG. 6 or an arrow in FIG.

  Further, as shown in FIG. 7, the passage forming member 31 is configured such that the area of the opening 33 is larger than the cross-sectional area of the middle portion of one intake passage 27 (for example, the portion indicated by the broken line B in FIG. 7). The shape of the case body 12 (upstream intake chamber 21) is set. Thereby, it is possible to facilitate the flow of air from the suction port 16 toward the filter 25.

  Further, as shown in FIG. 6, the shape and arrangement of the passage forming member 31 are set so that the opening 33 faces the center of the filter 25. Thereby, the dust removal effect of the filter 25 can be enhanced, and the purification efficiency of the intake air can be improved.

  Further, when the air cleaner 1 is attached to the motorcycle, the shape of the passage forming member 31 and the case main body 12 (upstream intake chamber 21) so that the intake passage 27 is inclined from the front side to the rear side of the motorcycle. And the arrangement is set. Thereby, a smooth flow of air from the suction port 16 toward the engine 2 can be created. In the present embodiment, as shown in FIG. 6, the intake passage 27 is set to incline upward from the front side to the rear side of the motorcycle.

  As described above, according to the air cleaner 1 according to the embodiment of the present invention, by providing the intake passage 27 in the upstream intake chamber 21, the cross-sectional area of the flow path of the air sucked from the intake port 16 can be adjusted. At the same time, since the air flow path can be lengthened, intake noise can be reduced without providing a resonator. That is, by providing the intake passage 27 and adjusting the cross-sectional area of the air flow path, the frequency band of the intake noise can be changed. Thereby, the frequency band of noise can be set to a frequency band in which humans do not feel as noise, for example. Further, since the intake noise is generally attenuated by the intake air flowing through the passage, the degree of attenuation of the intake noise can be increased by providing the intake passage 27 and lengthening the air circulation path.

  Further, since the intake passage 27 is formed along the direction of air flow from the intake port 16 toward the engine 2, air can flow smoothly. Thereby, the output fall suppression effect of the engine 2 and the intake noise reduction effect can be enhanced. Further, since the passage forming member 31 is formed as a member different from the case main body 12, the engine output reduction suppressing effect or the intake noise reducing effect is enhanced depending on how the shape of the passage forming member 31 is designed. In addition, the shape of the intake passage 27 can be easily set or changed.

  Moreover, according to the air cleaner 1, since it is not necessary to provide a resonator, a large air cleaner volume can be ensured. Further, by forming the intake passage 27 with the passage forming member 31, the convex portion 29 of the upstream intake chamber 21, and the wall portion 28 of the case body 12, the cost for forming the intake passage 27 can be reduced. The increase in weight due to the formation of the intake passage 27 can be suppressed. Further, since the intake passage 27 is provided in the upstream intake chamber 21, the degree of freedom in the layout of the air cleaner 1 can be ensured.

  In the above-described embodiment, the case where the two intake passages 27 are provided has been described as an example. However, the number of intake passages may be one, or may be three or more. In the above-described embodiment, the two intake passages 27 respectively corresponding to the two intake ports 16 are provided, and the intake ports 16 and the intake passages 27 are made to correspond one-to-one, but the present invention is not limited to this. For example, one intake passage may be provided for two intake ports, or two intake passages may be provided for one intake port.

  In the above-described embodiment, the case where the intake passage 27 is formed by the passage forming member 31, the convex portion 29 of the upstream intake chamber 21, and the wall portion of the case main body 12 is described as an example. The intake passage may be formed only by the forming member and the wall portion of the cover body, or the intake passage may be formed only by the wall portion of the cover body and the convex portion of the upstream intake chamber.

  Further, the present invention can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and an air cleaner for an internal combustion engine accompanying such a change is also a technique of the present invention. Included in thought.

1 Air cleaner 2 Engine (internal combustion engine)
5 Cut Valve 6 Hose 11 Case 12 Case Main Body 13 Cap 14 Communication Port 15 Inlet Pipe 16 Inlet 17 Recess 21 Recess 21 Upstream Inlet Chamber 22 Downstream Inlet Chamber 23 Partition Wall 24 Filter Mounting Hole 25 Filter 26 Air Funnel 27 Intake Passage 28 Wall 29 convex portion 31 passage forming member 32 main plate portion 33 opening portion 34 sub plate portion 35 fitting portion 36 mounting portion

Claims (5)

Case and
A partition that separates the interior of the case into an upstream intake chamber and a downstream intake chamber;
A suction port communicating with the upstream suction chamber;
A filter that is provided in the partition wall and purifies air flowing from the suction port into the upstream intake chamber and going to the downstream intake chamber;
An intake passage that is provided inside the upstream intake chamber and regulates a flow range of air from the intake port toward the filter ;
A passage forming member for forming the intake passage is provided inside the upstream intake chamber,
The passage forming member is
A plate-shaped main plate portion that divides the upstream intake chamber into an upstream space and a downstream space;
An opening formed in the main plate portion;
Extending from the main plate portion to the upstream side of the upstream intake chamber, and having a sub-plate portion in contact with the wall portion of the upstream intake chamber in the case,
The air cleaner for an internal combustion engine, wherein the intake passage is a tubular passage formed in a part of a space upstream of the upstream intake chamber by the passage forming member and a wall portion of the case . The passage area of the opening of the forming member, an air cleaner for an internal combustion engine according to claim 1, wherein greater than the cross-sectional area of the intermediate portion of the intake passage. The air cleaner for an internal combustion engine according to claim 1 or 2 , wherein the opening of the passage forming member is disposed so as to face a central portion of the filter. The outer bottom surface of the case is formed with a recess for arranging other parts between the air cleaner and the internal combustion engine when the air cleaner is mounted above the internal combustion engine. An air cleaner for an internal combustion engine according to any one of claims 1 to 3 . The intake passage, an air cleaner for an internal combustion engine according to any of claims 1 to 4 the air cleaner is characterized in that inclined toward the rear side from the front side of the vehicle body in a state of being attached to the vehicle body.

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