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In the air intake system of an engine which introduces air passed through a cleaner case having filter element therein into a throttle box through a throttle, and distributes the air from the throttle box to each cylinder of the engine by an intake manifold, the throttle is provided in the throttle

In the air intake system of an engine which introduces air passed through a cleaner case having filter element therein into a throttle box through a throttle, and distributes the air from the throttle box to each cylinder of the engine by an intake manifold, the throttle is provided in the throttle box such that a center axis of the throttle is provided substantially horizontally and in a center in the vertical direction between the ends on the upstream side of the intake pipes. The intake pipes are provided on both sides of the throttle box and the throttle is connected to the throttle box such that a center axis of the throttle is arranged substantially horizontal and, simultaneously, an intake route for linking the throttle (including the main port) to the filter element is substantially arranged linearly on the center axis of the throttle. Also, the inside of the cleaner case is in the form of a hollow and is divided by a partition into the air cleaner case and a blowby room. The throttle box and the intake manifold are separately formed in advance and then are monolithically connected to each other.

대표청구항 ▼

1. An air intake system of an engine for introducing air passed through a cleaner case having a filter element therein into a manifold through a throttle, and distributing the air from the manifold to each cylinder of the engine by an intake element, comprising:both sides of the manifold opposite to

1. An air intake system of an engine for introducing air passed through a cleaner case having a filter element therein into a manifold through a throttle, and distributing the air from the manifold to each cylinder of the engine by an intake element, comprising:both sides of the manifold opposite to each other wherein the manifold is mounted on an upper side of the engine through the intake element,the cleaner case being connected to the manifold,plural intake pipes provided side by side and vertically to both of the sides of the manifold opposite to each other in the intake element, each end on an upstream side of the intake pipes being opened and each end on a downstream side of the intake pipes connecting to each of intake ports of the engine, anda center axis of the throttle in the manifold being substantially horizontal and centered in the vertical direction between the ends on the upstream side of the intake pipes extended to a center between the ends on the upstream side opposite to each other provided on both sides of the manifold. 2. The air intake system of the engine as defined in claim 1, wherein:the cleaner case has an air cleaner case having the filter element therein and a main port leading air from the air cleaner case to the throttle, and an intake route linking the throttle including the main port to the filter element is linearly arranged on an extension line of the center axis of the throttle. 3. The air intake system of the engine as defined in claim 1, wherein the cleaner case has;a cleaner case body molded monolithically from a resin which has a lower portion of an air cleaner case opened upper side thereof with the filter element therein and which has a lower portion of a blowby room opened upper side thereof and divided into each other by a partition;a case cover molded monolithically from a resin, which has the upper portions of the air cleaner case and blowby room which cover the upside of the lower portions of the air cleaner case and the blowby room,the cleaner case being a hollow cleaner case and including the lower and upper portions of the air cleaner case into which the filter element is incorporated and which is formed by combining the cleaner case body to the case cover, andthe blowby room is formed from the lower and upper portions of the blowby room, which constitute a blowby gas reflux system. 4. The air intake system of the engine as defined in claim 3, wherein the cleaner case body is molded monolithically such that the main port, which leads air from the inside of the air cleaner case to the throttle through the lower portions of the air cleaner and the blowby room, is further incorporated into the cleaner case body. 5. The air intake system of an engine as defined in claim 3, wherein a fixing member for supporting an air flowmeter is provided on the cleaner case body or the case cover. 6. The air intake system of the engine as defined in claim 1, wherein the intake element is divided into a pair of intake manifolds each of which is connected to each of the sides of the manifold. 7. The air intake system of the engine as defined in claim 1, wherein an inter cooler is connected to the manifold at substantially the same height as the manifold instead of the cleaner case. 8. An air intake system of an engine which introduces air passed through a cleaner case having a filter element therein into a manifold through a main port and a throttle, and distributes the air from the manifold to each cylinder of the engine by an intake element, comprising:the manifold mounted on an upper side of the engine through the intake element connected to the manifold,the cleaner case being connected to the manifold, andthe throttle being connected to the manifold such that a center axis of the throttle is provided substantially horizontal, and an intake route, linking the throttle with the main port to the filter element, is linearly provided on an extension line of the center axis of the throttle. 9. The ai r intake system of the engine as defined in claim 8, wherein the cleaner case has;a cleaner case body molded monolithically from a resin, which has a lower portion of air cleaner case opening its upper side and has the filter element therein and which has a lower portion of a blowby room opening its upper side which is divided into each other by a partition,a case cover molded monolithically from a resin, which has the upper portions of the air cleaner case and blowby room which cover the upside of the lower portions of the air cleaner case and the blowby room,the cleaner case is a hollow cleaner case which has the lower and upper portions of the air cleaner case into which the filter element is incorporated and which is formed by combining the cleaner case body to the case cover, andthe blowby room is formed from the lower and upper portions of the blowby room, which constitute a blowby gas reflux system. 10. The air intake system of the engine as defined in claim 9, wherein the cleaner case body is molded monolithically such that the main port, which leads air from the inside of the air cleaner case to the throttle through the lower portions of the air cleaner and the blowby room, is further incorporated into the cleaner case body. 11. The air intake system of the engine as defined in claim 10, wherein a fixing member for supporting said air flowmeter is mounted on the cleaner case body or the case cover. 12. An air intake system of an engine which introduces air passed through a cleaner case having a filter element therein into a manifold through a throttle, and distributes the air from the manifold to each cylinder of the engine by an intake element,wherein the manifold is mounted on an upper side of the engine through the intake element connected to the manifold,the cleaner case, which is in the form of a hollow case, is connected to the manifold at substantially the same height as each other and obtained by monolithically molding both of an air cleaner case having the filter element divided by a partition therein and a blowby room constituting a blowby gas reflux system, wherein the cleaner case has;a cleaner case body molded monolithically from a resin, which has a lower portion of air cleaner case opening the upper side and has the filter element therein and which has a lower portion of a blowby room opening the upper side which is divided into each other by a partition,a case cover molded monolithically from a resin, which has the upper portions of the air cleaner case and blowby room which cover the upside of the lower portions of the air cleaner case and the blowby room,the cleaner case is a hollow cleaner case which has the lower and upper portions of the air cleaner case into which the filter element is incorporated and which is formed by combining the cleaner case body to the case cover, andthe blowby room is formed from the lower and upper portions of the blowby room, which constitute a blowby gas reflux system. 13. An air intake system of an engine which introduces air passed through a cleaner case having a filter element therein into a manifold through a throttle, and distributes the air from the manifold to each cylinder of the engine by an intake element,wherein the manifold is mounted on an upper side of the engine through the intake element connected to the manifold,the cleaner case, which is in the form of a hollow case, is connected to the manifold at substantially the same height as each other and obtained by monolithically molding both of an air cleaner case having the filter element divided by a partition therein and a blowby room constituting a blowby gas reflux system, wherein the blowby room comprises a first blowby room separating foreign matters from a fresh air fed from the air cleaner to a crank case of the engine and a second blowby room separating foreign matters from the blowby gas recycling between the crank case of the engine and the manifold, the first and second blowby rooms being divide d by a parting wall. 14. An air intake system of an engine which introduces a fresh air passed through a cleaner case having filter element therein into a manifold through a throttle, and distributes the air from the manifold to each cylinder of the engine by an intake element,wherein the manifold and the intake element, which are separately formed in advance, are bonded to each other by monolithically connecting an installation opening which opens at the manifold to an end on an upstream side of the intake element, and an end on a downstream side of the intake element is mounted on an upper side of the engine, and the cleaner case is molded monolithically from a resin and connected to the manifold at substantially the same height as each other, wherein: the manifold has an installation opening which opens at a side of the throttle box,ends on the upstream side of the intake element are monolithically connected to the installation opening,and the intake element extends in a downwardly curved configuration from said connected point, and an end on the downstream side of the intake element is mounted on the engine. 15. An air intake system of an engine which introduces a fresh air passed through a cleaner case having filter element therein into a manifold through a throttle, and distributes the air from the manifold to each cylinder of the engine by an intake element,wherein the manifold and the intake element, which are separately formed in advance, are bonded to each other by monolithically connecting an installation opening which opens at the manifold to an end on an upstream side of the intake element, and an end on a downstream side of the intake element is mounted on an upper side of the engine, and the cleaner case is molded monolithically from a resin and connected to the manifold at substantially the same height as each other, and wherein the manifold is monolithically molded from a resin, and the intake manifold is monolithically cast from a metal or resin, or monolithically molded from the resin. 16. An air intake system of an engine which introduces air passed through a cleaner case having a filter element therein into a manifold through a throttle, and distributes the air from the manifold to each cylinder of the engine by an intake element,wherein the manifold is mounted on an upper side of the engine through the intake element connected to the manifold,the cleaner case, which is in the form of a hollow case, is connected to the manifold and obtained by monolithically molding both of an air cleaner case having the filter element divided by a partition therein and a blowby room constituting a blowby gas reflux system, and wherein the cleaner case further has;a cleaner case body molded monolithically from a resin, which has a lower portion of air cleaner case opening the upper side and has the filter element therein and which has a lower portion of a blowby room opening the upper side which is divided into each other by a partition,a case cover molded monolithically from a resin, which has the upper portions of the air cleaner case and blowby room which cover the upside of the lower portions of the air cleaner case and the blowby room,the cleaner case is a hollow cleaner case which has the lower and upper portions of the air cleaner case into which the filter element is incorporated and which is formed by combining the cleaner case body to the case cover, andthe blowby room is formed from the lower and upper portions of the blow by room, which constitute a blowby gas reflux system. 17. The air intake system of the engine as defined in claim 16, wherein the cleaner case is connected to the manifold at substantially the same height as each other. 18. The air intake system of the engine as defined in claim 16, where the cleaner case body is molded monolithically such that the main port, which leads air from the inside of the air cleaner case to the throttle through the lower portions of the air cleaner and the blowby roo m, is further incorporated into the cleaner case body. 19. The air intake system of an engine as defined in claim 16, wherein the blowby room comprises a first blowby room separating foreign matters from fresh air fed from the air cleaner to a crank case of the engine and a second blowby room separating foreign matters from the blowby gas recycling between the crank case of the engine and the manifold, the first and second blowby rooms being divided by a parting wall. 20. The air intake system of the engine as defined in claim 16, wherein a fixing member for supporting an air flowmeter is mounted on the cleaner case body or the case cover. 21. An air intake system of an engine which introduces fresh air passed through a cleaner case having filter element therein into a manifold through a throttle, and distributes the air from the manifold to each cylinder of the engine by an intake element,wherein the manifold and the intake element, which are separately formed in advance, are bonded to each other by monolithically connecting an installation opening which opens at the manifold to an end on an upstream side of the intake element, and an end on a downstream side of the intake element is mounted on an upper side of the engine, andwherein the throttle is mounted in the manifold such that a center axis of the throttle is substantially horizontal, andthe cleaner case has the air cleaner case having the filter element therein and a main port leading air from the air cleaner case to the throttle, and an intake route of linking the throttle including the main port to the filter element is arranged linearly on an extension line of the center axis of the throttle. 22. The air intake system of the engine as defined in claim 21, wherein the cleaner case is molded monolithically from a resin such that it is connected to the manifold at substantially the same height as each other. 23. The air intake system of the engine as defined in claim 21, wherein:the manifold has an installation opening which opens at a side of the throttle box,ends on the upstream side of the intake element are monolithically connected to the installation opening,and the intake element extends in a downwardly curved configuration from said connected point, and an end on the downstream side of the intake element is mounted on the engine. 24. The air intake system of the engine as defined in claim 21, wherein the installation openings which open at both sides of the manifold have the same form as each other, and the openings of a pair of intake pipes have the same form as each other. 25. The air intake system of the engine as defined in claim 21, wherein:the manifold has installation openings which open at both sides of the manifold opposite to each other,the intake element is provided with intake pipes,the ends on the upstream side of each of the intake pipes are monolithically connected to each of the installation openings,and each of the intake pipes extends in a downwardly curved configuration from each of said connected points and a pair of ends on the downstream side of the intake pipes are mounted on the engine. 26. The air intake system of the engine as defined in claim 21, wherein:the intake element is provided with intake pipes and installation flanges on the upstream side and the downstream side for connecting ends on the upstream and downstream sides of the intake tube to each of the installation openings of the throttle box and an intake port of the engine,the installation flange on the upstream side has an installation flange body in contact with the side surface of the manifold along a periphery of the installation opening and an inserting part, which is protruded on the installation flange, for inserting in the installation opening, andthe periphery of the installation opening and the installation flange body are bonded to each other by ultra sonic welding. 27. The air intake system of the engine as defined in claim 21, wherein the manifold is monolithica lly molded from a resin, and the intake manifold is monolithically cast from a metal or resin, or monolithically molded from the resin. 28. The air intake system of the engine as defined in claim 21, wherein an inter cooler is used instead of the cleaner, and the inter cooler is connected to the manifold at substantially the same height as the throttle box. 29. An air intake system of an engine for introducing air passed through a case into a manifold through a throttle, and distributing the air from the manifold to each cylinder of the engine by an intake element, comprising:both sides of the manifold opposite to each other wherein the manifold is mounted on an upper side of the engine through the intake element,the case being connected to the manifold,plural intake pipes provided side by side and vertically to both of the sides of the manifold opposite to each other in the intake element, each end on an upstream side of the intake pipes being opened and each end on a downstream side of the intake pipes connecting to each of intake ports of the engine,a center axis of the throttle in the manifold being substantially horizontal and centered in the vertical direction between the ends on the upstream side of the intake pipes extended to a center between the ends on the upstream side opposite to each other provided on both sides of the manifold, and wherein said case comprises an inter cooler connected to the manifold at substantially the same height as the manifold. 30. An air intake system of an engine which introduces a fresh air passed through a case and into a manifold through a throttle, and distributes the air from the manifold to each cylinder of the engine by an intake element,wherein the manifold and the intake element, which are separately formed in advance, are bonded to each other by monolithically connecting an installation opening which opens at the manifold to an end on an upstream side of the intake element, and an end on a downstream side of the intake element is mounted on an upper side of the engine, and the case is an inter cooler that is connected to the manifold substantially the same height as each other.