Intake manifold for automobile engine

Abstract

The utility model relates to an air inlet manifold for an automobile engine, which comprises an air inlet channel, a pressure stabilizing cavity, a PCV system and a plurality of air outlet channels, and the air inlet channel sucks pressurized air and is communicated to the pressure stabilizing cavity; the pressure stabilizing cavity is communicated with the plurality of air outlet channels; the PCV system comprises a bifurcated pipeline, the bifurcated pipeline comprises an air inlet and a plurality of air outlets, the air inlet is communicated to a crankcase, the number of the air outlet channels is the same as that of the air outlets, and each air outlet is in fluid communication with the corresponding air outlet channel. And therefore, gas from the pressure stabilizing cavity is mixed with gas from the crankcase at the position. According to the intake manifold, blow-by gas and combustible mixed gas of a crankcase can be effectively distributed into all the air cylinders to be combusted, and the problem that water vapor is condensed and frozen after entering the intake manifold in the vehicle running process under the low-temperature environment is effectively solved.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to an intake manifold for an automobile engine. Background Art

[0002] When the engine is working, there is always a part of the combustible mixed gas and exhaust gas that leaks into the crankcase through the piston ring. The gasoline vapor that leaks into the crankcase will condense and make the engine oil thinner and deteriorate its performance. The exhaust gas also contains water vapor and sulfur dioxide. The water vapor condenses in the engine oil to form foam, which destroys the engine oil supply. This phenomenon is particularly serious in winter. Sulfur dioxide generates sulfurous acid when it meets water, and sulfurous acid generates sulfuric acid when it meets oxygen in the air. The appearance of these acidic substances not only deteriorates the engine oil, but also corrodes the parts. Therefore, Positive Crankcase Ventilation (PCV) is generally used. In this way, the mixed gas that leaks into the crankcase can be recycled and used, which is beneficial to improve the economy of the engine.

[0003] At present, plug-in hybrid electric vehicles, including range extender engines, are increasingly favored by the market. The PCV connectors of the intake manifold used by the range extender engine are mostly arranged around the throttle flange. As a result, when the vehicle is driving, the inner wall of the intake manifold and the throttle valve plate will have condensed water to varying degrees. Especially in low temperature environments (below 0°C), the condensed water will further freeze, leading to throttle proportional-integral-differential (PID) adjustment over-limit and other faults, ultimately affecting the performance of the engine. Summary of the invention

[0004] In order to overcome at least one of the defects described in the above-mentioned prior art, the present application proposes an intake manifold for an automobile engine, comprising an intake channel, a pressure-stabilizing chamber, a PCV system and a plurality of outlet channels, wherein the intake channel sucks in pressurized gas and is connected to the pressure-stabilizing chamber; the pressure-stabilizing chamber is connected to the plurality of outlet channels; the PCV system comprises a branch pipeline, the branch pipeline comprises an intake port and a plurality of outlet ports, the intake port is connected to a crankcase, the plurality of outlet channels and the plurality of outlet ports have the same number, and each of the plurality of outlet ports is fluidly connected to the corresponding outlet channel so that the gas from the pressure-stabilizing chamber is mixed with the gas from the crankcase here.

[0005] In one embodiment, the wall thickness of the intake manifold is 3.5 mm.

[0006] In another embodiment, the intake manifold further includes a plurality of reinforcing ribs arranged on the top surface and the bottom surface of the intake manifold.

[0007] In yet another embodiment, an end of the air inlet passage away from the pressure stabilizing chamber has a mounting flange.

[0008] In yet another embodiment, the intake manifold further includes a plurality of cylinder head connecting holes, and the plurality of cylinder head connecting holes and the plurality of air outlet passages are arranged alternately with each other.

[0009] In yet another embodiment, the pressure stabilizing chamber has a carbon canister joint, thereby being connected to the carbon canister to inhale gasoline vapor.

[0010] In yet another embodiment, the pressure stabilizing chamber further comprises a carbon canister solenoid valve bracket, and the carbon canister is mounted to the outside of the pressure stabilizing chamber via the bracket.

[0011] In yet another embodiment, the intake passage further includes a pressure and temperature sensor.

[0012] In yet another embodiment, the intake manifold further includes a fuel rail mounting hole so that the fuel rail can pass through the hole.

[0013] In yet another embodiment, a fuel rail receiving portion is further included to receive a fuel rail bracket, thereby supporting the fuel rail to pass through the rail mounting hole.

[0014] In yet another embodiment, the number of the plurality of air outlet channels and the plurality of air outlets is the same as the number of cylinders of the automobile engine.

[0015] The intake manifold of the present application mixes the blow-by gas from the crankcase and the combustible mixed gas from the intake channel in the outlet channel. Since the combustible mixed gas has flowed through the intake channel and the pressure stabilizing chamber before, and thus has a higher temperature, the blow-by gas will not condense when encountering the combustible mixed gas with a higher temperature. The intake manifold can effectively distribute the crankcase blow-by gas and the combustible mixed gas to each cylinder for combustion, and also effectively solves the problem that when the vehicle is driving in a low-temperature environment, the crankcase blow-by gas enters the intake manifold, causing the water vapor therein to evaporate due to the temperature rise, and the water vapor condenses and freezes inside the intake manifold. In addition, the top and bottom surfaces of the intake manifold are arranged with reinforcing ribs to ensure that the intake manifold has a high rigidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A front view of an intake manifold for an automobile engine according to an embodiment of the present application is shown;

[0017] Figure 2 Shows Figure 1 A side view of the intake manifold is shown;

[0018] Figure 3 Shows Figure 1 a rear view of the intake manifold shown; and

[0019] Figure 4 Shows Figure 1 A side cutaway view of the intake manifold is shown. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0022] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0023] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] Reference Figure 1-2, which respectively show the front view and side view of the intake manifold 1 for the automobile engine according to the embodiment of the present application. The intake manifold 1 includes an intake channel 2, a pressure stabilizing chamber 3, a PCV system and a plurality of outlet channels 4. The intake channel 2 is connected to the supercharged turbine of the automobile, thereby sucking in the supercharged gas, and the other end of the intake channel 2 is connected to the pressure stabilizing chamber 3. The pressure stabilizing chamber 3 is connected to a plurality of outlet channels 4. The PCV system includes a branch line 5, which includes an intake port 51 and a plurality of outlet ports 52, the intake port is connected to the crankcase to receive the blow-by gas leaked through the piston ring; the outlet channels 4 and the outlet ports 52 have the same number, and each outlet port 52 is fluidically connected to the corresponding outlet channel 4, so that the combustible mixed gas from the pressure stabilizing chamber 3 is mixed with the blow-by gas from the crankcase here. Preferably, the number of outlet channels 4 and outlet ports 52 is the same as the number of cylinders of the automobile engine. For example, when the automobile engine is a four-cylinder engine, the number of the outlet channels 4 and the outlet ports 52 is also four. The output end of each outlet channel 4 is connected to the automobile engine, specifically, to the corresponding cylinder suction chamber, so that when the cylinder runs to the suction stroke, the mixed gas is sucked from the corresponding outlet channel 4.

[0025] In order to connect the intake manifold 1, especially the output end of the outlet channel 4, to the corresponding cylinder suction chamber, the intake manifold 1 also includes a plurality of cylinder head connection holes 11, which are arranged alternately with the outlet channel 4. For example, in the case where the automobile engine is a four-cylinder engine, the number of cylinder head connection holes 11 is five, ensuring that cylinder head connection holes 11 are arranged on both sides of each outlet channel 4. In this way, sufficient fastening force is applied to both sides of each outlet channel 4 by fasteners, thereby ensuring the airtight connection between the outlet channel 4 and the corresponding cylinder suction chamber.

[0026] Preferably, the intake manifold 1 is designed to have a wall thickness of 3.5 mm to reduce the surface radiation noise of the intake manifold 1. In addition, the intake manifold 1 also has a plurality of reinforcing ribs 6, which are evenly arranged on the top and bottom surfaces of the intake manifold 1, thereby ensuring that the intake manifold 1 has a high rigidity.

[0027] In a preferred embodiment, the intake passage 2 further comprises a mounting hole 21 for a pressure and temperature sensor, so that the pressure and temperature sensor monitors the pressure and temperature of the combustible mixed gas from the supercharger turbine.

[0028] like Figure 4 As shown, it shows a side cross-sectional view of the intake manifold 1 according to an embodiment of the present application. The end of the intake passage 2 away from the pressure stabilizing chamber 3 has a mounting flange 22 so as to fix the intake passage 2 with the supercharger turbine.

[0029] In addition, the pressure stabilizing chamber 3 has a carbon canister connector 31, which is connected to the carbon canister of the car, so as to inhale gasoline vapor. Since gasoline is a volatile liquid, the fuel tank is often full of vapor at room temperature. The role of the carbon canister is to introduce gasoline vapor into combustion and prevent it from volatilizing into the atmosphere. Furthermore, the pressure stabilizing chamber 3 also has a carbon canister solenoid valve bracket 32, and the carbon canister is installed outside the pressure stabilizing chamber 3.

[0030] In order to facilitate the intake manifold 1 to supply the mixed gas to the automobile engine, the intake manifold 1 must be arranged close to the automobile engine. In order to ensure that gasoline can also be conveniently supplied to the automobile engine, such as Figure 3 As shown, the intake manifold 1 further includes a fuel rail mounting hole 12, so that the fuel rail passes through it, thereby supplying gasoline to the automobile engine through the fuel rail. Further, the intake manifold 1 further includes a fuel rail receiving portion 13, so as to receive a fuel rail bracket, thereby supporting the fuel rail to pass through the fuel rail mounting hole 12.

[0031] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. An intake manifold for an automobile engine, comprising an intake passage, a pressure-stabilizing chamber, a crankcase forced ventilation system and a plurality of outlet passages, wherein the intake passage sucks in pressurized gas and is connected to the pressure-stabilizing chamber; the pressure-stabilizing chamber is connected to the plurality of outlet passages; the crankcase forced ventilation system comprises a branching pipeline, the branching pipeline comprises an intake port and a plurality of outlet ports, the intake port is connected to the crankcase, the plurality of outlet passages and the plurality of outlet ports have the same number, and each of the plurality of outlet ports is fluidly connected to the corresponding outlet passage so that the gas from the pressure-stabilizing chamber is mixed with the gas from the crankcase here.

2. The intake manifold for an automobile engine according to claim 1, characterized in that: The wall thickness of the intake manifold is 3.5 mm.

3. The intake manifold for an automobile engine according to claim 1, characterized in that: The invention also includes a plurality of reinforcing ribs arranged on the top surface and the bottom surface of the intake manifold.

4. The intake manifold for an automobile engine according to claim 1, characterized in that: The end of the air inlet passage away from the pressure stabilizing chamber is provided with a mounting flange.

5. The intake manifold for an automobile engine according to claim 1, characterized in that: It also includes a plurality of cylinder head connecting holes, wherein the plurality of cylinder head connecting holes and the plurality of air outlet passages are arranged alternately with each other.

6. The intake manifold for an automobile engine according to claim 1, characterized in that: The pressure stabilizing chamber has a carbon canister joint, thereby being connected to the carbon canister, thereby sucking in gasoline vapor.

7. The intake manifold for an automobile engine according to claim 6, characterized in that: The pressure stabilizing chamber also has a carbon canister solenoid valve bracket, and the carbon canister is mounted to the outside of the pressure stabilizing chamber.

8. The intake manifold for an automobile engine according to claim 1, characterized in that: The intake passage also includes a pressure and temperature sensor.

9. The intake manifold for an automobile engine according to claim 1, characterized in that: A fuel rail mounting hole is also included so that the fuel rail can pass through it.

10. The intake manifold for an automobile engine according to claim 9, characterized in that: A fuel rail receiving portion is also included to receive a fuel rail bracket so as to support the fuel rail to pass through the rail mounting hole.

11. The intake manifold for an automobile engine according to claim 1, characterized in that: The number of the plurality of air outlet channels and the plurality of air outlets is the same as the number of cylinders of the automobile engine.

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