Intake manifold structure

Abstract

The utility model provides an intake manifold structure which has good reliability. From the upstream direction end of the airflow direction, the intake manifold structure sequentially comprises: a throttle body mounting part; an air introduction part; an intake chamber; the air inlet manifold structure comprises an air inlet chamber and a plurality of air inlet branch pipes, the air inlet branch pipes extend out of the side face of the air inlet chamber and are arranged in the arrangement direction of air cylinders of the engine, the air inlet branch pipes are installed on an air cylinder cover of the engine, and the air inlet manifold structure is provided with independent exhaust gas recirculation gas channel components. And an exhaust gas recirculation gas passage member for forming an exhaust gas recirculation gas passage in the intake manifold structure, where the exhaust gas recirculation gas passage is open toward a downstream side in an airflow direction in the intake manifold structure, and the exhaust gas recirculation gas passage member is welded to the air introduction portion, the exhaust gas recirculation gas is introduced into the intake chamber through an air introduction portion so that the flow of the exhaust gas recirculation gas flows downstream in the airflow direction in the intake manifold structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of intake manifold structure. BACKGROUND

[0002] Since the foregoing, efforts to mitigate climate change or reduce the impact continue, and research and development related to exhaust emission improvement are being conducted to achieve the purpose.

[0003] In the prior art, in order to achieve the reduction of fuel consumption of the engine, an exhaust gas circulation device is proposed, which recirculates a part of the gas discharged after combustion in the combustion chamber as exhaust gas recirculation (EGR) gas into the intake passage of the engine. Generally, the above-mentioned exhaust gas circulation device is provided with: an exhaust gas recirculation passage, which recirculates a part of the exhaust gas flowing in the exhaust passage of the engine into the intake passage of the intake manifold of the engine; and a throttle body, which is provided in the exhaust gas recirculation passage and adjusts the flow rate of the exhaust gas recirculation gas recirculated into the intake passage. This exhaust gas circulation device adjusts the flow rate of the exhaust gas recirculation gas flowing in the exhaust gas recirculation passage by the throttle body, thereby achieving the backflow of the exhaust gas recirculation gas from the exhaust passage to the intake passage corresponding to the operating state of the engine.

[0004] However, in the above-mentioned device, if the outlet of the exhaust gas recirculation gas to the intake passage of the intake manifold is provided on the throttle body side, the high-temperature exhaust gas and water vapor in the exhaust gas recirculation gas may condense and adhere to the throttle body, which may further cause rust around the throttle body. In addition, with different shapes of intake manifolds for each product model, the air reverse flow direction distribution near the throttle body side may also change. When the distance of the air reverse flow near the throttle body side becomes longer, the condensate water in the backflow exhaust gas recirculation gas becomes more obvious, which further worsens the effect of the condensate water on the throttle body. However, due to the narrow space at the inlet of the intake passage of the intake manifold, the outlet of the exhaust gas recirculation gas is far away from the throttle body to prevent the condensate water from entering the throttle body, which may cause difficulties in assembling the components.

[0005] The present case aims to achieve exhaust emission improvement to solve the problem. Furthermore, it helps to mitigate climate change or reduce the impact.

[0006] [Prior Art Documents]

[0007] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2001-152984

[0009] [Patent Document 2] Japanese Patent Publication No. 2018-28279 Utility Model Content

[0010] The utility model provides a kind of intake manifold structure, with good reliability.

[0011] The utility model provides a kind of intake manifold structure. Intake manifold structure from the upstream direction end of airflow direction includes in sequence: throttle body installation part;Air introduction part;Intake chamber;And multiple intake branch pipes, extend from the side of the intake chamber and along the arrangement direction of the cylinder of engine arrangement, the multiple intake branch pipes are installed on the cylinder cover of the engine, and the intake manifold structure is provided with independent exhaust gas recirculation gas passage member, for forming exhaust gas recirculation gas passage in the intake manifold structure, wherein the exhaust gas recirculation gas passage opens towards the downstream side of airflow direction in the intake manifold structure, and exhaust gas recirculation gas passage member is welded to the air introduction part, so that the airflow of exhaust gas recirculation gas is introduced into the intake chamber through air introduction part in the manner of flowing to the downstream of airflow direction in the intake manifold structure.

[0012] In an embodiment of the utility model, the above-mentioned intake manifold structure is provided with an inclined surface between the air introduction part and the intake chamber, and the exhaust gas recirculation gas passage member has an extension part extending relative to the inclined surface.

[0013] In an embodiment of the utility model, the above-mentioned exhaust gas recirculation gas passage member has a greater width dimension as closer to the opening of the exhaust gas recirculation gas passage.

[0014] In an embodiment of the utility model, the above-mentioned throttle body installation part is upwardly open, and the throttle body is installed on the throttle body installation part, the intake manifold structure forms a throttling part between the air introduction part and the pressure storage groove of the intake chamber, and the opening of the exhaust gas recirculation gas passage is arranged in the throttling part.

[0015] Based on the above, in the intake manifold structure of the utility model, by the arrangement of exhaust gas recirculation gas passage member, exhaust gas recirculation gas passage can be easily constructed without the need to arrange pipe member for exhaust gas recirculation gas flow, and the water vapor in exhaust gas recirculation gas is inhibited from being carried away by the reversed airflow near the throttle body side and gathering towards the throttle body side, so as to prevent the condensate water from appearing on the throttle body, further prevent rust around the throttle body, and improve the reliability of the device. Moreover, it can also simultaneously achieve the effect of uniformly distributing exhaust gas recirculation gas into each intake branch pipe of the intake manifold structure and into the engine to ensure the stable combustion of the engine.

[0016] In order to make the above features and advantages of the present application more obvious and easy to understand, the following embodiments are described in detail below, and the detailed description is made with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] FIG. 1 is a schematic view of an engine according to an embodiment of the present application;

[0018] FIG. 2A is FIG. 1 a schematic view of an intake manifold structure of the engine shown in FIG. 1 from another side view angle;

[0019] FIG. 2B is FIG. 2A a schematic view of an exhaust gas recirculation gas passage member and its setting position shown in FIG. 1;

[0020] FIG. 2C is FIG. 2A a schematic view of the intake manifold structure shown in FIG. 1 in a cross section along line A-A;

[0021] FIG. 3A is a schematic view of an exhaust gas recirculation gas passage member according to an embodiment of the present application;

[0022] FIG. 3B is FIG. 3A a schematic view of the exhaust gas recirculation gas passage member shown in FIG. 3 installed in FIG. 1 the intake manifold structure of the engine shown in FIG. 1;

[0023] FIG. 3C is FIG. 3B a schematic view of the intake manifold structure shown in FIG. 1 in a cross section along line B-B;

[0024] FIG. 3D is FIG. 3B a schematic view of the intake manifold structure shown in FIG. 1 in a cross section along line C-C;

[0025] FIG. 4A is a schematic view of an exhaust gas recirculation gas passage member according to another embodiment of the present application;

[0026] FIG. 4B is FIG. 4A a schematic view of the exhaust gas recirculation gas passage member shown in FIG. 5 installed in FIG. 1 the intake manifold structure of the engine shown in FIG. 1 in a cross section.

[0027] EXPLANATION OF REFERENCE NUMERALS:

[0028] 10: engine

[0029] 11: engine body

[0030] 12: throttle body

[0031] 13: protection plate

[0032] 13a: plate body

[0033] T1, T2: exhaust gas recirculation gas passage

[0034] 14: fuel pipe

[0035] 100: intake manifold structure

[0036] 110: throttle body mounting portion

[0037] 120: air introduction portion

[0038] 130: intake chamber

[0039] 140: intake branch pipe

[0040] 150, 150A, 150B: exhaust gas recirculation gas passage member

[0041] AM: air flow

[0042] PR: extension portion

[0043] TH: throttle portion

[0044] TS: inclined surface DETAILED DESCRIPTION

[0045] FIG. 1 is a schematic view of an engine 10 according to an embodiment of the present application; FIG. 2A is FIG. 1 is a schematic view of the intake manifold structure 100 of the engine 10 shown in FIG. 1, as viewed from another side; FIG. 2B is FIG. 2A is a schematic view of an exhaust gas recirculation gas passage member 150 and its setting position, as shown in FIG. 2; FIG. 2C is FIG. 2A is a schematic view of the intake manifold structure 100, as viewed in the cross section of line A-A. Hereinafter, the detailed structure of the intake manifold structure 100 of the engine 10 will be described. FIGS. 1-2C DETAILED DESCRIPTION

[0046] Referring to FIG. 1 In the present embodiment, the engine 10 includes an engine body 11, an intake manifold structure 100, a throttle body 12, a protection plate 13, and a fuel pipe 14 as a fuel system component. Specifically, as shown in FIG. 1As shown, in the present embodiment, one end of the intake manifold structure 100 is connected to the engine body 11. The throttle body 12 is provided with a throttle valve inside and is connected to the other end of the intake manifold structure 100. The protection plate 13 is located between the engine body 11 and the intake manifold structure 100, and the protection plate 13 includes a plate body 13a and an exhaust gas recirculation gas passage T1 in the plate body 13a. In the present embodiment, through the configuration of the plate body 13a of the protection plate 13 and the exhaust gas recirculation gas passage T1, the protection plate 13 can simultaneously realize the passage function of the exhaust gas recirculation and the collision protection function of the impact absorbing member that absorbs the impact load in the collision, without the need to additionally provide a member that makes the exhaust gas recirculation gas flow through and a pipe member that makes the exhaust gas recirculation gas flow through, thereby reducing the number of parts required.

[0047] On the other hand, as FIG. 2A shown, the intake manifold structure 100 includes, in order from the upstream end in the airflow direction, a throttle body mounting portion 110, an air introduction portion 120, an intake chamber 130, and a plurality of intake branch pipes 140. The throttle body mounting portion 110 is open upward, and the throttle body 12 is mounted on the throttle body mounting portion 110. The intake branch pipes 140 extend from the side of the intake chamber 130 and are arranged in the arrangement direction of the cylinders of the engine 10, and the plurality of intake branch pipes 140 are mounted on the cylinder head of the engine 10. In the present embodiment, the mode of action of the intake chamber 130 and the intake branch pipes 140 is known in the art, and is not described here. Here, the airflow direction refers to the flow direction of the gas introduced into the intake branch pipes 140 of the intake manifold structure 100.

[0048] Further, as FIG. 2C shown, in the present embodiment, the intake manifold structure 100 is provided with a separate exhaust gas recirculation gas passage member 150 for communicating with the exhaust gas recirculation gas passage T1 of the protection plate 13 and forming an exhaust gas recirculation gas passage T2 in the intake manifold structure 100.

[0049] More specifically, as FIGS. 2A-2C shown, in the present embodiment, the exhaust gas recirculation gas passage T2 in the intake manifold structure 100 is open toward the downstream side in the airflow direction in the intake manifold structure 100, and the exhaust gas recirculation gas passage member 150 is welded to the air introduction portion 120 of the intake manifold structure 100, so that the exhaust gas recirculation gas flow AM flows downstream in the airflow direction in the intake manifold structure 100 through the air introduction portion 120 and is introduced into the intake chamber 130.

[0050] Thus, by providing the exhaust gas recirculation gas passage member 150, the exhaust gas recirculation gas passages T1, T2 can be easily constructed without the need to provide a pipe member for the flow of exhaust gas recirculation gas, and by the opening of the exhaust gas recirculation gas passage T2 facing toward the throttle body 12 side, it is possible to inhibit water vapor in the exhaust gas recirculation gas from being carried away by the reverse flow of air near the throttle body 12 side and gathering toward the throttle body 12 side, and it is possible to prevent the occurrence of condensed water on the throttle body 12, and further prevent rusting around the throttle body 12, and it is possible to improve the reliability of the device.

[0051] Further, as shown in FIG. 2C , the intake manifold structure 100 forms a throttle portion TH between the air introduction portion 120 and the pressure reservoir of the intake chamber 130, and the opening of the exhaust gas recirculation gas passage T2 is provided in the throttle portion TH. Thus, the air supplied to each cylinder in the intake system of the engine 10 and the fuel vapor in the fuel line form an air flow that, after passing through the throttle of the throttle body 12, can be mixed and regulated with the exhaust gas recirculation gas that enters through the opening of the exhaust gas recirculation gas passage T2 at the throttle portion TH, and it is possible to uniformly distribute the air, the fuel vapor in the fuel line, and the exhaust gas recirculation gas to each intake runner and into the engine 10, to ensure stable combustion of the engine 10.

[0052] FIG. 3A is a schematic view of an exhaust gas recirculation gas passage member according to an embodiment of the present application; FIG. 3B is FIG. 3A an exhaust gas recirculation gas passage member installed in FIG. 1 the intake manifold structure of the engine 10 shown in FIG. 3C is FIG. 2A a schematic view of the intake manifold structure shown in FIG. 3D is FIG. 2A a schematic view of the intake manifold structure shown in FIGS. 3A-3D , in FIGS. 3A-3D the embodiment, the exhaust gas recirculation gas passage member 150A is similar to the exhaust gas recirculation gas passage member 150 of FIGS. 2A-2C , and the differences between the two are described below. As shown in FIG. 3D , in the present embodiment, the intake manifold structure 100 is provided with an inclined surface TS between the air introduction portion 120 and the intake chamber 130, and the exhaust gas recirculation gas passage member 150A has an extension portion PR extending relative to the inclined surface TS. Thus, it is possible to cause the water vapor in the exhaust gas recirculation gas to flow toward the wall surface of the intake chamber 130, and further prevent the condensed water from falling within the intake chamber 130, and it is possible to further ensure stable combustion of the engine 10.

[0053] And, since the exhaust gas recirculation gas passage member 150A is provided, the exhaust gas recirculation gas passages T1, T2 can be easily constructed without the need to provide a pipe member for the flow of exhaust gas recirculation gas, and the water vapor in the exhaust gas recirculation gas is inhibited from being carried away by the reverse airflow near the throttle body 12 side and gathering toward the throttle body 12 side, so that when applied to the aforementioned intake manifold structure 100 to replace the exhaust gas recirculation gas passage member 150, the aforementioned intake manifold structure 100 and engine 10 can still achieve the aforementioned functions and effects, and other related details will not be repeated here.

[0054] FIG. 4A is a schematic view of an exhaust gas recirculation gas passage member according to another embodiment of the present application; FIG. 4B is FIG. 4A exhaust gas recirculation gas passage member FIG. 1 shown in the intake manifold structure of the engine. Please refer to FIG. 4A and FIG. 4B , in FIG. 4A and FIG. 4B in the embodiment of the exhaust gas recirculation gas passage member 150B and FIG. 3A and FIG. 3D exhaust gas recirculation gas passage member 150A, and the differences between the two are described as follows. As FIG. 4A and FIG. 4B shown, in this embodiment, the exhaust gas recirculation gas passage member 150B has a larger width dimension as it gets closer to the opening of the exhaust gas recirculation gas passage T2. In this way, the opening diameter of the exhaust gas recirculation gas passage T2 can be expanded, and the exhaust gas recirculation gas discharge area and flow rate can be expanded, so that the exhaust gas recirculation gas can be diffused and uniformly distributed in the intake chamber 130 in a large area.

[0055] And, since the exhaust gas recirculation gas passage member 150B is provided, the exhaust gas recirculation gas passages T1, T2 can be easily constructed without the need to provide a pipe member for the flow of exhaust gas recirculation gas, and the water vapor in the exhaust gas recirculation gas is inhibited from being carried away by the reverse airflow near the throttle body 12 side and gathering toward the throttle body 12 side, so that when applied to the aforementioned intake manifold structure 100 to replace the exhaust gas recirculation gas passage member 150, 150A, the aforementioned intake manifold structure 100 and engine 10 can still achieve the aforementioned functions and effects, and other related details will not be repeated here.

[0056] In summary, in the intake manifold structure of the utility model, through the setting of the exhaust gas recirculation gas passage component, the exhaust gas recirculation gas passage can be easily constructed without setting the pipe component for making the exhaust gas recirculation gas flow, and the water in the exhaust gas recirculation gas is inhibited from being taken away by the reverse airflow near the throttle body side and gathered towards the throttle body side, so that the condition of condensate water appearing on the throttle body can be prevented, and further, the rust around the throttle body can be prevented, and the reliability of the device can be improved. Moreover, the exhaust gas recirculation gas can also be evenly distributed to each intake manifold of the intake manifold structure and enter the engine, so as to ensure the effect of stable combustion of the engine.

[0057] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. An intake manifold structure characterized by, The intake manifold structure includes, in order from an upstream end in the direction of airflow, a throttle body mounting portion, an air introduction portion, an intake chamber, and a plurality of intake branch pipes that extend from the side of the intake chamber and are arranged in the arrangement direction of the cylinders of the engine, the plurality of intake branch pipes being mounted to the cylinder head of the engine, and The intake manifold structure is provided with a separate exhaust gas recirculation gas passage member for forming an exhaust gas recirculation gas passage in the intake manifold structure, wherein the exhaust gas recirculation gas passage opens toward the downstream side in the direction of airflow in the intake manifold structure, and the exhaust gas recirculation gas passage member is welded to the air introduction portion so that the flow of exhaust gas recirculation gas is introduced into the intake chamber through the air introduction portion in a manner that flows downstream in the direction of airflow in the intake manifold structure. The intake manifold structure is provided with an inclined surface between the air introduction portion and the intake chamber, and the exhaust gas recirculation gas passage member has an extension portion that extends with respect to the inclined surface. The exhaust gas recirculation gas passage member has a greater width dimension as it gets closer to the opening of the exhaust gas recirculation gas passage.

4. The intake manifold structure according to any one of claims 1 to 3, wherein The throttle body mounting portion is open upward, and a throttle body is mounted to the throttle body mounting portion, 2. The intake manifold structure according to claim 1, characterized by The intake manifold structure forms a throttle portion between the air introduction portion and the surge tank of the intake chamber, and the opening of the exhaust gas recirculation gas passage is provided in the throttle portion.

3. The intake manifold structure according to claim 2, characterized by ​ ​ ​ ​

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