Lightweight intake manifold assembly for diesel engine

Abstract

The lightweight intake manifold assembly comprises an intake manifold body, the intake manifold body is a plastic part and comprises an intake manifold section and an intake elbow section which are integrally formed, a first mounting flange is arranged at the inlet end of the intake elbow section, a second mounting flange is arranged at the outlet end of the intake manifold section, and the intake manifold section is provided with a second mounting flange. A third mounting flange is arranged at the inlet end of a waste gas inlet in one side of the intake manifold section, and sealing rings are embedded in the end faces of the three mounting flanges; the third mounting flange is connected with a waste gas inlet pipe, the outlet end of the waste gas inlet pipe is provided with a connecting pipe, the connecting pipe is fixedly connected with the third mounting flange through a peripheral mounting flange cover plate, and the tail section of the connecting pipe penetrates through the waste gas inlet and extends into an inner cavity of the intake manifold section; and gaps are reserved between the inner side wall of the waste gas inlet and the outer side wall of the connecting pipe and between the tail end of the connecting pipe and the wall surface of the inner cavity of the intake manifold section. The utility model has the advantages that the light weight and integration are realized, and the assembly is convenient and fast.

Description

Technical Field

[0001] This utility model relates to the field of internal combustion engine technology, and in particular to a lightweight intake manifold assembly for diesel engines. Background Technology

[0002] The diesel engine intake system is responsible for introducing air into the combustion chamber. Its main purpose is to support combustion by introducing sufficient air and to create adequate pressure within the combustion chamber to ensure proper engine operation. The EGR (Exhaust Gas Re-circulation) system returns a portion of the exhaust gases from the engine to the intake manifold, where they are mixed with a fresh air-fuel mixture and re-enter the combustion chamber.

[0003] Diesel engines operate under harsh conditions. Currently, the intake manifolds in diesel engine intake systems are mostly made of cast aluminum, which is bulky and expensive. Furthermore, they require multiple components such as intake bends, gaskets, and bolts for assembly, resulting in poor integration and complicated factory assembly. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a lightweight intake manifold assembly for diesel engines, so as to achieve lightweight and integrated design, strengthen the overall structural strength, and facilitate quick and easy assembly.

[0005] This utility model is achieved through the following technical solution:

[0006] A lightweight intake manifold assembly for a diesel engine includes an intake manifold body, which is a plastic part. The intake manifold body includes an integrally formed intake manifold section and an intake bend section. The inner cavity of the intake manifold section is connected to the internal channel of the intake bend section. A first mounting flange is provided at the inlet end of the intake bend section, and a second mounting flange is provided at the outlet end of the intake manifold section. An exhaust gas inlet is opened on one side of the intake manifold section, and a third mounting flange is provided at the inlet end of the exhaust gas inlet. Sealing rings are embedded on the end faces of the three mounting flanges.

[0007] The exhaust gas inlet pipe is connected to the third mounting flange. A connecting pipe is provided at the outlet end of the exhaust gas inlet pipe. A mounting flange cover is fixedly fitted around the connecting pipe. The mounting flange cover is fixedly connected to the third mounting flange. The end of the connecting pipe passes through the exhaust gas inlet and extends into the inner cavity of the intake manifold section. An annular gap is left between the inner wall of the exhaust gas inlet and the outer wall of the connecting pipe. A gap is left between the end of the connecting pipe and the inner wall of the intake manifold section.

[0008] As a preferred embodiment of the above-mentioned intake manifold assembly, the outer surface of the intake manifold body is provided with multiple intersecting reinforcing ribs.

[0009] As a preferred embodiment of the above-mentioned intake manifold assembly, the second mounting flange has multiple second mounting holes spaced apart on its outer periphery. Each second mounting hole is press-fitted with a bolt assembly. The bolt assembly includes an inner and outer set of connecting bolts and a bushing. The shank of the connecting bolt protrudes from the mounting surface of the second mounting flange. The cylinder head is bolted together by the connecting bolts of the multiple sets of bolt assemblies.

[0010] As a preferred embodiment of the above-mentioned intake manifold assembly, a closed sealing groove is opened on the mounting surface of the second mounting flange, a sealing ring is embedded in the sealing groove, a plurality of second mounting holes are located outside the sealing groove, and some of the second mounting holes are connected to the sealing groove.

[0011] As a preferred embodiment of the above-mentioned intake manifold assembly, the inner wall of the intake manifold section protrudes inward to form a ridge at the location corresponding to each of the second mounting holes, and the ridge has a chamfer on the end face of the corresponding intake manifold section outlet end.

[0012] As a preferred embodiment of the above-mentioned intake manifold assembly, the mounting flange cover includes a cover plate and a convex ring located at the middle of the bottom end of the cover plate. The cover plate is connected to the third mounting flange by bolts. The convex ring extends into the exhaust gas inlet, and a gap is left between the outer wall of the convex ring and the inner wall of the exhaust gas inlet.

[0013] As a preferred embodiment of the above-mentioned intake manifold assembly, the angle of the bend in the intake bend section is greater than degrees.

[0014] As a preferred embodiment of the above-mentioned intake manifold assembly, the portion of the channel near the outer side of the bend in the intake bend section is provided with a rounded corner.

[0015] As a preferred embodiment of the above-mentioned intake manifold assembly, the first mounting flange has a plurality of first mounting holes spaced apart on its outer periphery, and the third mounting flange has a plurality of third mounting holes spaced apart on its outer periphery, and each first mounting hole and third mounting hole is press-fitted with a threaded bushing.

[0016] This invention has the following advantages over the prior art:

[0017] 1. This utility model provides a lightweight intake manifold assembly for diesel engines. The intake manifold body is made of plastic, with the intake manifold section and intake bend section integrally molded, achieving a lightweight intake manifold assembly. At the same time, it eliminates the connecting parts between the separate intake bend section and intake manifold section in the traditional intake manifold body. In addition, the sealing ring is embedded in the end face of each mounting flange, realizing the integration of the sealing ring. This eliminates the sealing gaskets and connecting bolts required for the assembly of the traditional intake manifold body, achieving a lightweight and integrated intake manifold assembly, and making assembly convenient and quick.

[0018] 2. This utility model provides a lightweight intake manifold assembly for diesel engines. The exhaust gas intake pipe is connected to the third mounting flange at the inlet end of the exhaust gas intake port of the intake manifold section. A connecting assembly is formed by an inner and outer fixed connecting pipe and a mounting flange cover plate. The exhaust gas intake pipe is connected to the third mounting flange through the connecting assembly. Gaps are left between the inner wall of the exhaust gas intake port and the outer wall of the connecting pipe, and between the end of the connecting pipe and the inner wall of the intake manifold section. During operation, the gaps are filled with fresh air after intercooling, which effectively prevents the plastic intake manifold body from being melted by the high-temperature exhaust gas sent in by the exhaust gas intake pipe, thus ensuring the normal use of the intake manifold body.

[0019] 3. The present invention provides a lightweight intake manifold assembly for diesel engines, which has multiple intersecting reinforcing ribs on the outer surface of the intake manifold body, thereby improving the overall strength of the intake manifold body and preventing cracking during use. At the same time, in conjunction with the lifting action of the connecting components, the intake manifold assembly can be guaranteed to work normally without the need for additional support components.

[0020] 4. The present invention provides a lightweight intake manifold assembly for diesel engines, wherein the second mounting flange integrates a bolt assembly consisting of connecting bolts and bushings, and the first and third mounting flanges are integrated with threaded bushings, thereby improving the integration of components, reducing the preparation of materials on the production line, and shortening the assembly time on the production line. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present invention.

[0022] Figure 2 This is a three-dimensional view of the three sealing rings of this utility model after disassembly.

[0023] Figure 3 This is a perspective view of the present invention after it is connected to the exhaust gas inlet pipe.

[0024] Figure 4 yes Figure 3 Cross-sectional view after axially cutting the connecting pipe.

[0025] Figure 5 This is a three-dimensional transverse half-sectional view of this utility model.

[0026] Figure 6 This is a transverse half-sectional view of the present invention.

[0027] Figure 7 This is a cross-sectional view of the present invention after being axially cut open from the second mounting hole.

[0028] Figure 8 This is the front view of this utility model.

[0029] Figure 9 yes Figure 8 Enlarged view of point A.

[0030] Figure 10 This is a three-dimensional view of the second sealing ring of this utility model after disassembly.

[0031] Numbered in the diagram: 1. Intake manifold section; 2. Intake bend section; 3. Reinforcing rib; 4. First mounting flange; 5. Second mounting flange; 6. Exhaust gas inlet; 7. Third mounting flange; 8. First threaded bushing; 9. First sealing ring; 10. Second mounting hole; 11. Bolt assembly; 12. Sealing groove; 13. Second sealing ring; 14. Raised ridge; 15. Chamfer; 16. Third threaded bushing; 17. Exhaust gas inlet pipe; 18. Connecting pipe; 19. Mounting flange cover plate; 20. Annular gap one; 21. Gap; 22. Cover plate; 23. Raised ring; 24. Annular gap two; 25. Rounded corner; 26. Third sealing ring. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0033] See Figures 1 to 10 This embodiment discloses a lightweight intake manifold assembly for a diesel engine, including an intake manifold body made of plastic. The intake manifold body includes an integrally formed intake manifold section 1 and an intake bend section 2. Multiple intersecting reinforcing ribs 3 are provided on the outer surface of the intake manifold body. The reinforcing ribs 3 are distributed in a crisscross pattern on the outer surface of the intake manifold body and are integrally formed with the intake manifold body. This arrangement of reinforcing ribs 3 effectively improves the strength of the intake manifold body and effectively prevents cracking during use. The inner cavity of the intake manifold section 1 is connected to the internal channel of the intake bend section 2. A first mounting flange 4 is provided at the inlet end of the intake bend section 2. A second mounting flange 5 is provided at the outlet end of the intake manifold section 1. An exhaust gas inlet 6 is opened on one side of the intake manifold section 1, and a third mounting flange 7 is provided at the inlet end of the exhaust gas inlet 6. Sealing rings are embedded on the end faces of all three mounting flanges.

[0034] The first mounting flange 4 has multiple first mounting holes spaced apart on its outer circumference, and a first threaded bushing 8 is press-fitted into each first mounting hole. A throttle valve is externally connected to the first mounting flange 4 by bolts passing through the throttle valve and tightening them into the first threaded bushing 8 of the first mounting flange 4, thereby connecting the throttle valve to the first mounting flange 4; and a first sealing ring 9 embedded on the first mounting flange 4 is used to achieve a seal between the throttle valve and the first mounting flange 4.

[0035] Multiple second mounting holes 10 are spaced apart on the outer periphery of the second mounting flange 5. Each second mounting hole 10 contains a bolt assembly 11 press-fitted into it. The bolt assembly 11 includes an inner and outer fitted connecting bolt and a bushing. The shank of the connecting bolt protrudes from the mounting surface of the second mounting flange 5. Bolt connection to the cylinder head is achieved through the connecting bolts of the multiple bolt assemblies 11. A closed sealing groove 12 is formed on the mounting surface of the second mounting flange 5. A second sealing ring 13 is embedded in the sealing groove 12, sealing the gap 21 between the sealing surface of the second mounting flange 5 and the mating surface of the cylinder head. The multiple second mounting holes 10 are located around the sealing groove 12, and some of the second mounting holes 10 are connected to the sealing groove 12. A ridge 14 protrudes inward from the inner wall of the intake manifold section 1 at locations corresponding to each second mounting hole 10. The ridge 14 in the inner cavity of the intake manifold section is designed to meet the strength requirements for installing the bolt assemblies 11 in each second mounting hole 10. The protruding ridge 14 has a chamfer 15 on the end face of the corresponding intake manifold section 1 outlet end. The chamfer 15 can make the gas flow in the inner cavity of the intake manifold section 1 smoother, further increase the volume of the inner cavity of the intake manifold section 1, and improve the engine power. At the same time, it can make the sealing surface of the second mounting flange 5 at the outlet end of the intake manifold section 1 match the shape of the cylinder head mating surface, ensuring the smooth flow of gas after the two are installed.

[0036] The third mounting flange 7 has multiple third mounting holes spaced apart on its outer periphery, and a third threaded bushing 16 is press-fitted into each third mounting hole. The third mounting flange 7 is connected to the exhaust gas inlet pipe 17, and the outlet end of the exhaust gas inlet pipe 17 is provided with a connecting pipe 18. The connecting pipe 18 is fixedly fitted with a mounting flange cover plate 19, which is fixedly connected to the third mounting flange 7. The end of the connecting pipe 18 passes through the exhaust gas inlet port 6 and extends into the inner cavity of the intake manifold section 1. An annular gap 20 is left between the inner wall of the exhaust gas inlet port 6 and the outer wall of the connecting pipe 18, and a gap 21 is left between the end of the connecting pipe 18 and the inner wall of the intake manifold section 1. The mounting flange cover 19 includes a cover plate 22 and a raised ring 23 located at the center of the bottom end of the cover plate 22. The cover plate 22 is connected to the third mounting flange 7 by bolts. The bolts pass through the through holes in the cover plate 22 and are tightened into the third threaded bushing 16 of the third mounting flange 7, thus connecting the cover plate 22 and the third mounting flange 7. The gap 21 between the cover plate 22 and the third mounting flange 7 is sealed by the third sealing ring 26 embedded on the third mounting flange 7. The raised ring 23 extends into the exhaust gas inlet 6, and an annular gap 24 is left between the outer wall of the raised ring 23 and the inner wall of the exhaust gas inlet 6. The connecting pipe 18 and the mounting flange cover 19 can be made of stainless steel. The connecting pipe 18 and the outlet end of the exhaust gas inlet pipe 17, and the mounting flange cover 19 and the connecting pipe 18 can be fixedly connected by welding.

[0037] See Figure 5 and Figure 6 The bend angle of intake manifold section 2 is greater than 90 degrees. In the channel at the bend of intake manifold section 2, the portion near the outer side has a rounded corner of 25°, while the portion near the inner side has no rounded corner. This ensures that the intake manifold body can be molded from only two directions during molding: demolding direction one and demolding direction two, simplifying the manufacturing process. The intake manifold body is integrally injection molded, eliminating the need for welding and making the overall structure more reliable. Figure 6 The two arrows in the middle represent ejection direction one and ejection direction two, respectively.

[0038] The lightweight intake manifold assembly for diesel engines provided in this embodiment has reinforcing ribs 3 integrally formed on the outer surface of the intake manifold body, which can enhance the strength of the product; at the same time, the exhaust gas intake pipe 17 is connected at the third mounting flange 7, and the mounting flange cover plate 19 outside the connecting pipe 18 plays a role in suspending and supporting the intake manifold assembly; it can ensure its strength without the need for additional support structure, and effectively prevent it from failing due to cracking during use.

[0039] During operation, the EGR exhaust gas from the exhaust gas inlet pipe 17 is at a high temperature. Since the intake manifold body is made of plastic, in order to prevent the plastic intake manifold body from melting at high temperatures, gaps are left between the outer wall of the convex ring 23 of the mounting flange cover plate 19 and the inner wall of the exhaust gas inlet 6, between the inner wall of the exhaust gas inlet 6 and the outer wall of the connecting pipe 18, and between the end of the connecting pipe 18 and the inner wall of the intake manifold section 1. The gas entering from the intake bend section 2 is intercooled fresh air. The intercooled fresh air will fill the above gaps, cooling and mixing the high-temperature exhaust gas from the exhaust gas inlet pipe 17, thereby reducing the temperature at the above gaps. This effectively prevents the heat of the high-temperature exhaust gas from radiating outwards and melting the intake manifold body, thus ensuring that the plastic intake manifold body can work normally, stably, and reliably.

[0040] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lightweight intake manifold assembly for a diesel engine, comprising an intake manifold body, characterized in that: The intake manifold body is made of plastic. The intake manifold body includes an integrally formed intake manifold section (1) and an intake bend section (2). The inner cavity of the intake manifold section (1) is connected to the inner channel of the intake bend section (2). The intake bend section (2) has a first mounting flange (4) at the inlet end and a second mounting flange (5) at the outlet end. An exhaust gas inlet (6) is opened on one side of the intake manifold section (1). A third mounting flange (7) is provided at the inlet end of the exhaust gas inlet (6). Sealing rings are embedded on the end faces of the three mounting flanges. The exhaust gas inlet pipe (17) is connected at the third mounting flange (7). The outlet end of the exhaust gas inlet pipe (17) is provided with a connecting pipe (18). The connecting pipe (18) is fixedly fitted with a mounting flange cover plate (19). The mounting flange cover plate (19) is fixedly connected to the third mounting flange (7). The end of the connecting pipe (18) passes through the exhaust gas inlet port (6) and extends into the inner cavity of the intake manifold section (1). An annular gap (20) is left between the inner wall of the exhaust gas inlet port (6) and the outer wall of the connecting pipe (18). A gap (21) is left between the end of the connecting pipe (18) and the inner wall of the intake manifold section (1).

2. A lightweight intake manifold assembly for a diesel engine as described in claim 1, characterized in that: The outer surface of the intake manifold body is provided with multiple intersecting reinforcing ribs (3).

3. A lightweight intake manifold assembly for a diesel engine as described in claim 1, characterized in that: The second mounting flange (5) has multiple second mounting holes (10) spaced apart on its outer periphery. Each second mounting hole (10) is press-fitted with a bolt assembly (11). The bolt assembly (11) includes an inner and outer set of connecting bolts and bushings. The shank of the connecting bolt protrudes from the mounting surface of the second mounting flange (5). The bolts of the multiple sets of bolt assemblies (11) are used to achieve bolt connection with the cylinder head.

4. A lightweight intake manifold assembly for a diesel engine as described in claim 3, characterized in that: The second mounting flange (5) has a closed sealing groove (12) on its mounting surface. A sealing ring is embedded in the sealing groove (12). Multiple second mounting holes (10) are located around the sealing groove (12), and some of the second mounting holes (10) are connected to the sealing groove (12).

5. A lightweight intake manifold assembly for a diesel engine as described in claim 4, characterized in that: The inner wall of the intake manifold section (1) protrudes inward to form a ridge (14) at the location corresponding to each of the second mounting holes (10), and the ridge (14) has a chamfer (15) on the end face of the corresponding intake manifold section (1) outlet end.

6. A lightweight intake manifold assembly for a diesel engine as described in claim 1, characterized in that: The mounting flange cover (19) includes a cover plate (22) and a convex ring (23) located at the middle of the bottom end of the cover plate (22). The cover plate (22) is connected to the third mounting flange (7) by bolts. The convex ring (23) extends into the exhaust gas inlet (6), and there is a gap (21) between the outer wall of the convex ring (23) and the inner wall of the exhaust gas inlet (6).

7. A lightweight intake manifold assembly for a diesel engine as described in claim 1, characterized in that: The angle of the bend in the intake bend section (2) is greater than 90 degrees.

8. A lightweight intake manifold assembly for a diesel engine as described in claim 7, characterized in that: The portion of the inlet bend (2) with rounded corners (25) near the outer side is provided in the channel.

9. A lightweight intake manifold assembly for a diesel engine as described in claim 1, characterized in that: The first mounting flange (4) has multiple first mounting holes spaced apart on its outer periphery, and the third mounting flange (7) has multiple third mounting holes spaced apart on its outer periphery. Each first mounting hole and each third mounting hole is press-fitted with a threaded bushing.

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