Engine intake manifold and engine
Through the combined design of standard pipe fittings and end covers, two sets of molds are used to produce engine intake manifolds, which solves the problem of high mold costs for intake manifolds of different engine models, and achieves cost reduction and improved production efficiency.
Patent Information
- Application Number
- CN202423130342.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-12-18
AI Technical Summary
Existing engine intake manifolds require separate molds for different models, resulting in high mold costs, increased production costs, and are not conducive to the promotion of low-priced engines.
Adopting the design of standard pipe fittings and end covers, two sets of molds are used to produce different types of intake manifolds. The end covers are welded to form assembly parts that meet installation requirements, reducing the number of molds.
It reduces mold cost investment, improves production efficiency, adapts to the installation requirements of different engine models, and reduces mold opening costs.
Smart Images
Figure CN223447151U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to engine technology field, concretely relates to an air intake manifold installed on engine. BACKGROUND
[0002] The air intake manifold is an important component of the engine intake system, and its main function is to distribute clean air evenly to the intake valves of each cylinder to ensure that each cylinder can obtain sufficient air, thereby ensuring the normal operation of the engine.
[0003] The existing engine air intake manifold needs to be connected by several different types of assembly components due to the different position distribution and partial functions. Most of these different types of assembly components have the same structural features, only the local structure is different. For example, Figure 1 Three types of assembly components are shown, which can be defined as A type, B type and C type. Most of the structures of these three types of assembly components are the same, and all include an air intake manifold 1 and two air intake branch pipes 2 connected vertically with the air intake manifold 1 and internally through, the difference is only in the structural design of the end of the air intake manifold 1. Specifically, the A type assembly component has two openings at both ends of the air intake manifold 1, which is usually installed in the middle section of the entire air intake manifold during use. The left end of the air intake manifold 1 of the B type assembly component is open, and the right end is shorter than the A type assembly component and closed, which is usually installed at the rightmost end of the entire air intake manifold during use, used for sealing the gas in the air intake manifold 1. The right end of the air intake manifold 1 of the C type assembly component is open, and the left end is shorter than the A type assembly component and closed, which is usually installed at the leftmost end of the entire air intake manifold during use, used for sealing the gas in the air intake manifold 1.
[0004] These different types of assembly components need to be opened respectively during production, and the mold cost of injection molding process is very high. The high cost of mold opening leads to the increase of the price of the air intake manifold, which is not conducive to the popularization and application in low-priced engines.
[0005] The above information disclosed in the background is only used to increase the understanding of the background of the application, and therefore it can include prior art known by those skilled in the art. SUMMARY
[0006] The utility model discloses in view of the above problems existing in the prior art, and proposes an engine air intake manifold, which can reduce the number of molds used and reduce the cost.
[0007] To solve the above technical problems, the utility model adopts the following technical scheme:
[0008] In one aspect, the utility model provides a kind of engine intake manifold, including standard pipe fittings and end cap;Wherein, the standard pipe fittings include intake manifold and intake branch pipe, the intake manifold is opened in the axial direction both ends, forms the steady pressure chamber of axial through;The intake branch pipe is connected the intake manifold, inside with the steady pressure chamber communication;The standard pipe fittings include multiple, the intake manifold of multiple standard pipe fittings is sequentially connected in axial direction, forms the intake end and terminal end in the position relative in axial direction;The end cap is welded to the terminal end, blocks the steady pressure chamber of the intake manifold forming the terminal end.
[0009] In some embodiments of the present application, in order to save mold, reduce mold cost, a set of main mold can be designed to injection mold the standard pipe fittings, a set of cover plate mold can be designed to injection mold the end cap, the same number of standard pipe fittings as the number of cylinders in the engine can be injection molded by using the main mold, and one end cap can be injection molded by using the cover plate mold. The welding direction of the end cap is determined according to the installation direction and intake direction of the intake manifold on the engine, and after the end cap is welded, an intake manifold meeting the installation requirements of the engine can be formed. In this way, only two sets of molds are needed to produce different types of intake manifolds, thereby greatly reducing the cost investment of manufacturing molds.
[0010] In some embodiments of the present application, when the installation space of the intake manifold reserved by the engine is limited, the standard pipe fittings forming the terminal end can be partially processed, i.e. the intake manifold forming the terminal end is partially cut, so that the length of the intake manifold forming the terminal end is less than the length of the intake manifold of other standard pipe fittings. Thus, the total length of the finally formed intake manifold can be adapted to the length of the intake manifold installation position reserved by the engine, so as to ensure the smooth installation of the intake manifold on the engine.
[0011] In some embodiments of the present application, the intake manifolds of two adjacent standard pipe fittings can be assembled and connected together by using sealing pipe fittings, to facilitate disassembly and maintenance.
[0012] In some embodiments of the present application, one end of the intake branch pipe of the standard pipe fitting can be connected perpendicularly to the intake manifold, and the other end can form an air outlet for connecting the intake valve of the engine cylinder. In order to ensure reliable sealing between the intake branch pipe and the intake valve of the cylinder during assembly, a sealing groove can be formed on the end of the intake branch pipe forming the air outlet, for installing a sealing ring. Meanwhile, assembly holes for installing cylinder head flanges can also be formed at the four corner positions of the end of the intake branch pipe forming the air outlet, to realize the fixed assembly between the intake branch pipe and the intake valve of the cylinder through the cylinder head flanges.
[0013] In some embodiments of the present application, two intake branches can be arranged in a standard pipe fitting for the case of two intake valves for each cylinder of the engine; in order to enhance the stability of the connection of the intake branch to the intake manifold, a reinforcing rib can be formed between the two intake branches of the standard pipe fitting, the reinforcing rib is arranged to transition from the outlet of one intake branch to the outlet of the other intake branch, and the outer edge of the reinforcing rib is in the shape of a semicircular arc. This semicircular arc-shaped reinforcing rib not only enhances the connection strength of the vertical connection part of the intake branch to the intake manifold, preventing root fracture, but also reduces the difficulty of mold opening.
[0014] In some embodiments of the present application, a triangular reinforcing rib can also be formed between the two intake branches of the standard pipe fitting and the two ends of the intake manifold, and the triangular reinforcing rib can be arranged to transition from the outlet of the intake branch to the port position adjacent to the intake manifold, thereby enhancing the connection strength of the vertical connection part of the intake branch to the intake manifold from another direction.
[0015] In some embodiments of the present application, reinforcing ribs in the shape of a grid can also be arranged on the outer walls of the end cover, the intake manifold, and the two intake branches of the standard pipe fitting, so as to increase the overall strength of the intake manifold.
[0016] In another aspect, the utility model also provides an engine, comprising a cylinder and an intake system; an engine intake manifold is arranged in the intake system, the intake manifold comprises a standard pipe fitting and an end cover; wherein the standard pipe fitting comprises an intake manifold and an intake branch, the intake manifold is open at both ends in the axial direction, forming an axial through stable pressure chamber; the intake branch is connected to the intake manifold and communicates with the stable pressure chamber inside; the standard pipe fitting comprises a plurality of standard pipe fittings, the intake manifolds of the plurality of standard pipe fittings are connected in sequence in the axial direction, forming an intake end and a terminal end which are opposite in position in the axial direction; the end cover is welded to the terminal end, blocking the stable pressure chamber of the intake manifold forming the terminal end, and each intake branch in the intake manifold is connected to each intake valve of the cylinder one by one.
[0017] In some embodiments of the present application, the engine has two rows of cylinders arranged back to back, and a set of engine intake manifolds can be installed on each row of cylinders, and the two sets of engine intake manifolds are in a mirror image position relationship, which results in the opposite positions of the standard pipe fittings welded with the end cover in the two sets of engine intake manifolds. If the prior art is used to assemble the two sets of intake manifolds, three molds need to be provided. However, by using the technology of the present application, only two molds are needed, and the welding position of the end cover is adjusted, so that the two sets of intake manifolds required can be assembled, thereby meeting the assembly requirements of the two sets of intake manifolds for the two rows of cylinders of the engine.
[0018] Compared with the prior art, the advantages and positive effects of the utility model mainly embody in:
[0019] 1、 The utility model discloses a plurality of assembly components are connected to form the air intake manifold, and the structural features of each assembly component are basically same, only the closed state of the port and the direction of the closed port are different, and a standard pipe fitting is designed according to the same structural feature, and the end cover is designed according to the structural feature of the closed port to form all assembly components.
[0020] 2、 The utility model discloses a standard pipe fitting cooperates with the end cover to manufacture different models of assembly components, and three complex molds with similar structures are not needed to be set up, only a main mold is set up according to the structural feature of the standard pipe fitting, and a cover plate mold is set up according to the structural feature of the end cover, so that three models of assembly components can be manufactured, and then the engine air intake manifold of different types with different overall lengths and opposite port closing directions can be assembled, the number of molds is small, the mold opening cost is low, and the manufacturing cost of the air intake manifold is reduced.
[0021] Other features and advantages of the utility model will become more apparent after reading the specific implementation mode of the utility model in combination with the drawings. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed to be used in the embodiment will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained according to the drawings without creative labor for those skilled in the art.
[0023] Figure 1 It is a structural schematic diagram of one embodiment of three different models of assembly components used in the prior art to manufacture the engine air intake manifold;
[0024] Figure 2 It is a structural schematic diagram of one embodiment of the standard pipe fitting of one of the components of the engine air intake manifold proposed by the utility model;
[0025] Figure 3 It is Figure 2 The right view of the standard pipe fitting shown in the figure;
[0026] Figure 4 It isFigure 2 Back perspective structural schematic view of the standard pipe fitting shown in the figure;
[0027] Figure 5 Figure 2 Top view of the standard pipe fitting shown in the figure;
[0028] Figure 6 Structural schematic view of one embodiment of the end cover which is a component part two of the engine intake manifold proposed by the utility model;
[0029] Figure 7 Figure 6 Bottom view of the end cover shown in the figure;
[0030] Figure 8 Figure 2 Exploded structural schematic view of the right end of the standard pipe fitting shown in the figure being partially cut and welded with the end cover;
[0031] Figure 9 Figure 2 Exploded structural schematic view of the left end of the standard pipe fitting shown in the figure being partially cut and welded with the end cover;
[0032] Figure 10 Structural schematic view of one embodiment of the intake manifold which is connected by the end cover and multiple standard pipe fittings;
[0033] Figure 11 Structural schematic view of one embodiment of the intake manifold whose port closing direction is opposite to that of the intake manifold shown in the figure; Figure 10
[0034] Layout view of two groups of engine intake manifolds in mirror image position relationship formed for two rows of air cylinders arranged in the back direction. Figure 12 In the figure, 1, intake manifold; 2, intake branch pipe; 100, standard pipe fitting; 110, intake manifold; 111, first end; 112, second end; 113, pressure stabilizing cavity; 114, wiring seat; 120, intake branch pipe; 121, gas outlet; 122, arc-shaped reinforcing rib; 123, triangular reinforcing rib; 124, triangular reinforcing rib; 125, grid-shaped reinforcing rib; 126, sealing groove; 127, assembly hole; 130, intake end; 140, termination end; 200, end cover; 210, outer surface; 220, inner surface; 230, reinforcing rib.
[0035] DETAILED DESCRIPTION
[0036] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.
[0037] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed or operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.
[0038] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or internal communication of components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In the description of the embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.
[0039] The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features.
[0040] In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.
[0041] The engine of the present embodiment can be a diesel engine or a gasoline engine. Taking a diesel engine as an example, it mainly includes an intake system, a fuel system, a combustion system, an exhaust system, a cooling system, a lubricating system and the like.
[0042] The intake system is the key part of the engine to obtain fresh air, mainly composed of air filter, intake pipe, supercharger, intercooler, intake manifold, etc. Among them, the air filter is responsible for filtering impurities in the air to ensure that the air entering the engine is clean. The intake pipe guides the air to the supercharger. The supercharger compresses the air to increase the density of the air entering the cylinder. The intercooler is used to reduce the temperature of the compressed air after the supercharger to prevent the engine from overheating. The intake manifold is used to evenly distribute the cooled compressed air to each cylinder to ensure that each cylinder can obtain sufficient air. The various components of the intake system work together to ensure the efficient and stable operation of the engine.
[0043] The fuel system is responsible for efficiently atomizing and injecting fuel into the cylinder to form a combustible mixture with air, mainly including fuel pump, fuel injector, high-pressure oil rail, etc. These components are precisely arranged around the engine and connected to the fuel injector through high-pressure oil pipes to ensure that the fuel is accurately injected into the cylinder under high pressure.
[0044] The combustion system is the core part of the engine to generate power, and its combustion process relies on the self-ignition characteristics of diesel, mainly composed of cylinder head, cylinder gasket, piston, fuel injector, etc. Among them, the cylinder head integrates the intake valve, exhaust valve, fuel injector mounting hole, cooling water channel and other complex structures to ensure the efficiency and stability of the combustion process in the cylinder.
[0045] The exhaust system is responsible for discharging the exhaust gas generated by combustion to reduce noise and pollution, mainly composed of exhaust manifold, three-way catalyst, muffler, etc. Among them, the exhaust manifold collects the exhaust gas generated by each cylinder, then purifies it through the three-way catalyst, and finally discharges it through the muffler.
[0046] The cooling system is the key to maintaining the normal working temperature of the engine, mainly composed of water tank, water pump, radiator, fan, etc. to ensure that the engine operates at an appropriate temperature.
[0047] The lubrication system is responsible for reducing friction between the components of the engine to extend its service life. Lubricating oil is delivered to all parts that need lubrication by the oil pump to reduce component wear and heat generation.
[0048] The above-mentioned systems work together to ensure the efficient and stable operation of the diesel engine.
[0049] The diesel engine of the present embodiment can be widely used in heavy machinery, mining, ship power, power station and other industrial fields.
[0050] In the intake system of an engine, the intake manifold is a key component of the intake system. For an engine with two rows of cylinders, a set of intake manifolds needs to be installed on each row of cylinders. Generally, the two rows of cylinders are arranged back-to-back, so that the two sets of intake manifolds installed on the engine will exhibit a mirror image relationship, as shown in Figure 12 .
[0051] Since the assembly components used to assemble to form the intake manifold, as shown in Figure 2 , the central axis O of the intake manifold 110 and the horizontal center line L of the intake branch pipe 120 (the horizontal center line L is perpendicular to the central axis of the intake branch pipe) can not be in the same vertical plane, as shown in Figure 3 , therefore, when making two sets of intake manifolds that need to be installed in a mirror image position relationship, three types of assembly components as shown in Figure 1 are needed to assemble to form two sets of intake manifolds with opposite port closing directions, as shown in Figure 10 , Figure 11 to meet the installation requirements of the back-to-back two rows of cylinders for the intake manifolds.
[0052] In order to reduce the number of molds and reduce the cost of mold opening, the embodiment designs a set of main mold to make a standard pipe 100, as shown in Figure 2 ; a set of cover plate mold to make an end cover 200, as shown in Figure 6 . By partially processing the standard pipe 100 and welding the end cover 200 on different ports of the intake manifold 110, the B-type assembly component and the C-type assembly component in Figure 1 can be formed, solving the problem of high mold opening cost caused by the need to open three sets of molds in the prior art.
[0053] In some embodiments, as shown in Figure 4 , the standard pipe 100 can include an intake manifold 110 and a plurality of intake branch pipes 120. The intake manifold 110 has two opposite ends along its axial direction, which can be defined as a first end 111 and a second end 112. The first end 111 and the second end 112 are open, thereby forming a pressure stabilization chamber 113 in the intake manifold 110 that extends axially through the first end 111 and the second end 112. One end of the intake branch pipe 120 is connected to the intake manifold 110 and is in communication with the pressure stabilization chamber 113, and the other end of the intake branch pipe 120 forms an air outlet 121 for connecting to the intake valve of the cylinder to deliver air to the cylinder.
[0054] For a cylinder with two intake valves, two intake branch pipes 120 can be provided on the standard pipe 100 to be connected to the two intake valves of the cylinder one by one.
[0055] In some embodiments, the two intake branch pipes 120 can be connected perpendicularly to the intake manifold 110, and the two intake branch pipes 120 are arranged in parallel and at intervals. Reinforcing ribs can be arranged at the connection positions of the intake branch pipes 120 and the intake manifold 110 to increase the connection strength and avoid the problem of root fracture.
[0056] In order to reduce the difficulty of mold opening, in some embodiments, an arc-shaped reinforcing rib 122 can be formed between the two intake branch pipes 120, as shown in the figure. Figure 4 The arc-shaped reinforcing rib 122 can transition from the air outlet 121 position of one of the intake branch pipes 120 to the air outlet position of the other intake branch pipe, forming a continuous plate rib with a semicircular arc-shaped outer edge to increase the connection strength between the intake branch pipe 120 and the intake manifold 110.
[0057] A triangular reinforcing rib 123, 124 can also be formed between the two intake branch pipes 120 and the two ends of the intake manifold 110, as shown in the figure. Figure 4 For example, a triangular reinforcing rib 123 can be arranged between the first end 111 of the intake manifold 110 and the intake branch pipe 120 adjacent to the first end 111. The triangular reinforcing rib 123 can transition from the air outlet 121 position of the intake branch pipe 120 to the first end 111 of the intake manifold 110, and then support the intake branch pipe 120 from the opposite two directions of the arc-shaped reinforcing rib 122 to further increase the connection strength between the intake branch pipe 120 and the intake manifold 110. Similarly, a triangular reinforcing rib 124 can be arranged between the second end 112 of the intake manifold 110 and the other intake branch pipe 120 adjacent to the second end 112. The triangular reinforcing rib 124 is arranged to transition from the air outlet 121 position of the other intake branch pipe 120 to the second end 112 of the intake manifold 110, and then support the other intake branch pipe 120 from the opposite two directions of the arc-shaped reinforcing rib 122 to further increase the connection strength between the intake branch pipe 120 and the intake manifold 110.
[0058] In addition, in order to ensure the strength of the intake manifold 110 and the intake branch pipes 120, the outer walls of the intake manifold 110 and the two intake branch pipes 120 can be covered with grid-shaped reinforcing ribs 125 to increase the overall strength of the standard pipe fitting 100.
[0059] Since the intake valve of the cylinder is usually arranged on the cylinder head and connected to the intake manifold through the cylinder head flange. In order to enable the intake branch pipe 120 of the standard pipe fitting 100 to be sealingly connected to the cylinder head flange and prevent gas leakage between the intake branch pipe 120 and the intake valve of the cylinder, a sealing groove 126 is formed on the end face of the end where the air outlet 121 of each intake branch pipe 120 is located, as shown in the figure. Figure 5As shown, the sealing groove 126 is installed with a sealing ring to ensure the air tightness of the flange joint.
[0060] In some embodiments, the sealing groove 126 can be designed to form a continuous ring around the air outlet 121 of the intake branch pipe 120 for installing an O-shaped sealing ring. Four assembly holes 127 can be formed at the four corners of the outer periphery of the sealing groove 126, and screws can be installed in the assembly holes 127 to be screwed with the cylinder head flange to achieve the fixed assembly between the intake branch pipe 120 and the intake valve of the cylinder.
[0061] As shown, a wiring seat 114 can be arranged at the lower part of the intake manifold 110 of the standard pipe 100 for installing a wiring harness. Figure 4
[0062] The end cover 200 can be designed to match the shape of the first end 111 and the second end 112 of the intake manifold 110 of the standard pipe 100. For example, for a cylindrical intake manifold 110, the cover plate mold can be designed to form a circular end cover 200, as shown in Figure 6 Figure 7 The end cover 200 can be welded to the first end 111 or the second end 112 of the intake manifold 110. For example, the end cover 200 is welded to the first end 111 of the intake manifold 110, as shown in Figure 9 Figure 1 The end cover 200 welded to the second end 112 of the intake manifold 110 can form an assembly part of type B, as shown in Figure 8 Figure 1 The end cover 200 welded to the second end 112 of the intake manifold 110 can form an assembly part of type B, as shown in
[0063] For the case where the length of the intake manifold mounting position reserved for the engine is limited, the standard pipe 100 with the welded end cover 200 can be partially processed, for example, a section of the intake manifold 110 is cut off, as shown in Figure 8 Figure 9 The cutting position should be selected at the end of the intake manifold 110 where the end cover 200 is needed, for example Figure 8 cutting from the second end 112 of the intake manifold 110, Figure 9 cutting from the first end 111 of the intake manifold 110, and welding the end cover 200 on the cut end surface to block the section of the intake manifold 110 of the standard pipe 100. The standard pipe 100 with the welded end cover 200 is used as a tail pipe, and after being assembled with other standard pipes 100, a complete intake manifold is formed.
[0064] In some embodiments, for the cutting length of the intake manifold 110, the total length of the assembled intake manifold can be adapted to the length of the intake manifold mounting position reserved for the engine.
[0065] In order to increase the strength of the end cover 200, as shown in Figure 6 、 Figure 7 , a grid-shaped reinforcing rib 230 can be formed on the outer surface 210 of the end cover 200, and the inner surface 220 of the end cover 200 can be kept smooth to simplify the structural design of the cover plate mold and reduce the manufacturing cost of the cover plate mold.
[0066] Industrial applicability
[0067] According to the number of cylinders in the engine, the same number of standard pipe fittings 100 are made by using the main mold. According to the number of cylinder banks arranged in the engine, the same number of end covers 200 are made by using the cover plate mold.
[0068] According to the number of cylinders in each row of cylinders, the same number of standard pipe fittings 100 are selected to be assembled together. Specifically, the intake manifolds 110 of these standard pipe fittings 100 can be connected in sequence along their axial direction to form an intake end 130 and a termination end 140 in the axial direction, as shown in Figure 10 、 Figure 11 . The intake end 130 is used to connect the intake pipe in the engine intake system to receive high-density air after compression and cooling. The termination end 140 is used to weld the end cover 200 to block the pressure stabilization cavity 113 of the intake manifold 110 forming the termination end 140.
[0069] For example, for the case of an engine with two rows of back-to-back cylinders, each row of cylinders including five groups of cylinders, ten standard pipe fittings 100 can be made by using the main mold, and two end covers 200 can be made by using the cover plate mold. Five standard pipe fittings 100 are selected to be connected together, and the left side port is used as the termination end 140. According to the length of the intake manifold mounting position reserved in the engine, the left side port is partially cut and then welded with an end cover 200 to form a group of intake manifolds, as shown in Figure 10 . The remaining five standard pipe fittings 100 are connected together, and the right side port is used as the termination end 140. According to the length of the mounting position reserved in the engine, the right side port is partially cut and then welded with another end cover 200 to form a second group of intake manifolds, as shown in Figure 11 .
[0070] According to the mounting direction and intake direction of the intake manifold on the engine, the above two groups of intake manifolds are mounted on the two rows of cylinders, for example, the intake branch pipes 120 of the two groups of intake manifolds are connected to the intake valves of the cylinder heads through the cylinder head flanges to realize reliable sealing connection between the intake manifolds and the cylinders.
[0071] Since the two rows of cylinders are arranged back to back, the two groups of intake manifolds are in a mirror image relationship after being mounted to the engine, as shown in Figure 12
[0072] Two standard pipe fittings 100 can be connected together by a sealing pipe fitting to facilitate disassembly and maintenance. In some embodiments, the sealing pipe fitting can be in the form of a pipe clamp with a sealing ring; or in the form of a clamping connection, which clamps the pipe fittings in the intake manifolds 110 of the front and rear standard pipe fittings 100 by radial contraction of external force, and ensures air tightness by an O-ring.
[0073] Compared with the prior art which requires three types of molds to manufacture the engine intake manifold, the embodiment eliminates the need for two of the injection molds, and the process cost and labor cost of cutting and welding are much lower than the mold opening cost of the two injection molds, so the mold cost can be greatly reduced.
[0074] Of course, the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions claimed by the present application.
Claims
1. An engine intake manifold, characterized in that: include: Standard pipe fittings, including: --The intake manifold is open at both ends of its axis to form an axially penetrating pressure-stabilizing chamber; --an intake branch pipe connected to the intake manifold and internally communicated with the pressure stabilizing chamber; The standard pipe fittings include a plurality of standard pipe fittings, and the intake manifolds of the plurality of standard pipe fittings are axially connected in sequence to form an intake end and a terminal end that are opposite in the axial direction; The end cover is welded to the terminating end and blocks the pressure stabilizing cavity of the intake manifold forming the terminating end.
2. The engine intake manifold according to claim 1, characterized in that: The standard pipe fittings are injection molded from a set of main body molds; The end cover is formed by injection molding of a set of cover plate molds; The number of standard pipe fittings injection-molded through the main mold is the same as the number of cylinders in the engine. The welding direction of the end cover is determined according to the installation direction of the intake manifold on the engine and the intake direction to form an intake manifold that meets the engine installation requirements.
3. The engine intake manifold according to claim 2, characterized in that: The length of the air intake manifold forming the terminal end is shorter than that of the air intake manifolds of other standard pipe fittings, and the air intake manifold forming the terminal end is formed by partially cutting the air intake manifolds of the standard pipe fittings.
4. The engine intake manifold according to any one of claims 1 to 3, characterized in that: The air intake manifolds of two adjacent standard pipe fittings are connected together by assembling a sealing pipe fitting.
5. The engine intake manifold according to any one of claims 1 to 3, characterized in that: In the standard pipe, one end of the intake branch pipe is vertically connected to the intake manifold, and the other end forms an outlet for connecting to the intake valve of the engine cylinder; A sealing groove is provided at one end of the air inlet branch pipe forming the air outlet, for installing a sealing ring; Assembly holes for mounting a cylinder head flange are provided at four corner positions of one end of the intake branch pipe forming the air outlet.
6. The engine intake manifold according to claim 5, characterized in that: The standard pipe fitting has two air inlet branches, and a reinforcing rib is formed between the two air inlet branches. The reinforcing rib transitions from the air outlet position of one of the air inlet branches to the air outlet position of the other air inlet branch, and the outer edge of the reinforcing rib is semicircular.
7. The engine intake manifold according to claim 6, characterized in that: A triangular reinforcement rib is formed between the two intake branches and the two ends of the intake main pipe of the standard pipe fitting, and the triangular reinforcement rib transitions from the air outlet position of the intake branch pipe to the port position of the intake main pipe and the adjacent port position.
8. The engine intake manifold according to claim 7, characterized in that: The outer walls of the end cover and the air intake main pipe and the two air intake branch pipes of the standard pipe are covered with grid-shaped reinforcing ribs.
9. An engine comprising a cylinder and an intake system; characterized in that: The intake system is provided with an engine intake manifold according to any one of claims 1 to 8, and each intake branch pipe in the intake manifold is connected to each intake valve of the cylinder in a one-to-one correspondence.
10. The engine according to claim 9, characterized in that The engine has two rows of cylinders arranged in back-to-back directions, and each row of cylinders is equipped with a set of the engine intake manifolds. The two sets of engine intake manifolds are in a mirror image relationship, and the standard pipe fittings for welding the end covers are in opposite positions in the two sets of engine intake manifolds.