Cylinder head and engine for engine testing and development

Abstract

The present invention discloses a cylinder head and an engine for engine testing and development, and belongs to the field of engine technology. The cylinder head of the present invention includes a combustion chamber end cover, an air duct and a valve assembly that are independent of each other. When conducting flow performance tests on combustion chambers of different engine structures, the combustion chamber end covers of different structures can be replaced individually. When conducting flow performance tests on air ducts of different engine structures, the air ducts of different structures can be replaced individually. When conducting tests on the influence of exhaust valve structure and lift on the engine flow field, the valve disc, valve stem or valve guide can be replaced individually; without replacing the valve stem and valve guide, the valve disc can also be replaced individually. Due to the adoption of the above-mentioned segmented cylinder head structure, when conducting engine air duct design and air duct steady-state flow tests, local structures can be quickly replaced, and other structures remain unchanged, which greatly reduces R&D costs and shortens the R&D cycle.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a cylinder head and an engine used for engine testing and development. Background Art

[0002] When designing engine intake and exhaust ducts, steady-state flow tests are required. These tests typically involve the cylinder head or duct core box, both of which are integrally machined parts. Once formed, the duct structure within the cylinder head cannot be altered. Therefore, any changes to the duct structure require redesigning and re-manufacturing both the cylinder head and duct core box, resulting in lengthy development cycles and high processing costs. Summary of the Invention

[0003] One object of the present invention is to provide a cylinder head for engine testing and development, which can quickly change the air duct, valve and combustion chamber end cover, greatly shortening the exhaust duct research and development cycle.

[0004] Another object of the present invention is to provide an engine that shortens the engine testing and development cycle and reduces development costs by applying the above-mentioned cylinder head.

[0005] To achieve the above objectives, the following technical solutions are provided:

[0006] In one aspect, a cylinder head for engine test development is provided, comprising:

[0007] combustion chamber end cover;

[0008] an air duct detachably connected to the combustion chamber end cover;

[0009] The valve assembly includes a valve guide, a valve stem and a valve disc. The valve guide is detachably connected to the air passage. The valve stem is telescopically arranged in the valve guide. The valve disc is detachably fixed to one end of the valve stem. The valve disc is located at the end of the air passage connected to the combustion chamber end cover. The valve disc can move in a direction close to or away from the air passage under the drive of the valve stem to control the amount of gas entering the air passage to decrease or increase.

[0010] As a preferred solution of the cylinder head, the cylinder head further includes an airway bracket, and the airway bracket is sleeved on the airway.

[0011] As a preferred embodiment of the cylinder head, a first connecting flange is provided on the combustion chamber end cover; a second connecting flange matching the first connecting flange is provided on the air duct, and the second connecting flange is clamped between the first connecting flange and the air duct bracket; the cylinder head also includes a fastener, which can lock or unlock the air duct bracket and the first connecting flange to connect the second connecting flange to the first connecting flange.

[0012] As a preferred solution for the cylinder head, a U-shaped airway mounting groove is provided on the airway bracket.

[0013] As a preferred solution of the cylinder head, one end of the valve stem is connected to the valve disc, and the other end passes through the valve guide and is located outside.

[0014] As a preferred solution of the cylinder head, a conduit mounting hole is provided on the air passage, one end of the valve conduit is inserted into the conduit mounting hole, and the other end is provided with a positioning plate, which is detachably connected to the outer end of the conduit mounting hole.

[0015] As a preferred solution of the cylinder head, the valve disc and the valve stem are coaxially arranged.

[0016] As a preferred solution of the cylinder head, the valve stem and the valve guide are coaxially arranged.

[0017] As a preferred solution of the cylinder head, the combustion chamber end cover is connected to one end of the cylinder liner of the engine to be tested and is coaxially arranged with the cylinder liner of the engine to be tested.

[0018] In another aspect, an engine is provided, comprising the cylinder head as described above.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The cylinder head of the present invention includes independent combustion chamber end covers, air ducts and valve assemblies. When conducting flow performance tests on combustion chambers of different engine structures, the combustion chamber end covers of different structures can be replaced individually. When conducting flow performance tests on air ducts of different engine structures, the air ducts of different structures can be replaced individually. When conducting tests on the effects of exhaust valve structure and lift on the engine flow field, the valve disc, valve stem or valve guide can be replaced individually; without replacing the valve stem and valve guide, the valve disc can also be replaced individually. Due to the adoption of the above-mentioned segmented cylinder head structure, when conducting engine air duct design and air duct steady-state flow tests, local structures can be quickly replaced while other structures remain unchanged, which greatly reduces R&D costs and shortens the R&D cycle.

[0021] The engine of the present invention shortens the engine testing and development cycle and reduces the development cost by applying the above-mentioned cylinder head. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional view of a cylinder head according to an embodiment of the present invention;

[0023] Figure 2 A schematic structural diagram of a cylinder head from one perspective in an embodiment of the present invention;

[0024] Figure 3 Schematic diagram of the structure of the cylinder head from another perspective in an embodiment of the present invention.

[0025] Reference numerals:

[0026] 100. Cylinder liner of the engine to be tested; 1. Combustion chamber end cover; 11. First connecting flange; 2. Air duct; 21. Second connecting flange; 22. Guide tube mounting hole; 3. Valve assembly; 31. Valve guide; 311. Positioning plate; 32. Valve stem; 33. Valve disc; 4. Air duct bracket; 41. Air duct mounting groove; 42. Reinforcement rib; 43. Fixing hole; 5. Fastener. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0034] like Figure 1-3As shown, this embodiment provides a cylinder head for engine testing and development, including a combustion chamber end cover 1, an air duct 2 and a valve assembly 3, wherein the air duct 2 is detachably connected to the combustion chamber end cover 1; the valve assembly 3 includes a valve guide 31, a valve stem 32 and a valve disc 33, the valve guide 31 is detachably connected to the air duct 2, the valve stem 32 is telescopically arranged in the valve guide 31, the valve disc 33 is detachably fixed to one end of the valve stem 32, the valve disc 33 is located at the end of the air duct 2 connected to the combustion chamber end cover 1, and the valve disc 33 can be moved in a direction close to or away from the air duct 2 under the drive of the valve stem 32 to control the amount of gas entering the air duct 2 to decrease or increase.

[0035] It should be noted that when conducting flow performance tests on combustion chambers of different engine structures, the combustion chamber end covers 1 of different structures can be replaced individually. When conducting flow performance tests on air ducts 2 of different engine structures, the air ducts 2 of different structures can be replaced individually. When conducting tests on the influence of exhaust valve structure and lift on the engine flow field, the valve disc 33, valve stem 32 or valve guide 31 can be replaced individually; without replacing the valve stem 32 and valve guide 31, the valve disc 33 can also be replaced individually. Due to the adoption of the above-mentioned segmented cylinder head structure, when conducting engine air duct 2 design and air duct 2 steady-state flow tests, local structures can be quickly replaced while other structures remain unchanged, which greatly reduces R&D costs and shortens the R&D cycle.

[0036] Optionally, the cylinder head further includes an airway support 4, which is sleeved on the airway 2. Furthermore, the airway support 4 is provided with a U-shaped airway mounting groove 41. The airway 2 is snapped into the airway mounting groove 41, and the airway support 4 plays a role in fixing and supporting the airway 2.

[0037] Optionally, the airway support 4 is further provided with a reinforcing rib 42 to increase the strength of the airway support 4. At the same time, the airway support 4 is further provided with a fixing hole 43, which can be fixed to the supporting plane using fasteners such as bolts.

[0038] Specifically, the combustion chamber end cover 1 is provided with a first connecting flange 11; the air duct 2 is provided with a second connecting flange 21 that matches the first connecting flange 11, and the second connecting flange 21 is sandwiched between the first connecting flange 11 and the air duct support 4. The cylinder head also includes fasteners 5 that can lock or unlock the air duct support 4 and the first connecting flange 11 to connect the second connecting flange 21 to the first connecting flange 11. In this embodiment, the fasteners 5 are bolts. Bolt holes are formed in the first connecting flange 11, the second connecting flange 21, and the air duct support 4. Bolts are inserted into the bolt holes to fasten the three together, and the second connecting flange 21 is clamped and fixed by the first connecting flange 11 and the air duct support 4.

[0039] Optionally, one end of the valve stem 32 is connected to the valve disc 33, while the other end passes through the valve guide 31 and is exposed to the outside. The valve disc 33 and valve stem 32 are also fixedly connected using fasteners such as bolts, making it easy to remove and replace the valve disc 33. A bell-shaped sealing groove is provided at the end of the air passage 2 that connects to the combustion chamber end cover 1. This sealing groove matches the shape of the valve disc 33, so that when the valve disc 33 abuts within the sealing groove, it can seal the air passage 2. When the valve disc 33 moves toward the air passage 2, driven by the valve stem 32, the gap between the valve disc 33 and the sealing groove gradually decreases, reducing the amount of gas entering the air passage 2. When the valve disc 33 moves away from the air passage 2, driven by the valve stem 32, the gap between the valve disc 33 and the sealing groove gradually increases, increasing the amount of gas entering the air passage 2.

[0040] Optionally, the air passage 2 is provided with a conduit mounting hole 22, one end of a valve conduit 31 is inserted into the conduit mounting hole 22, and the other end is provided with a positioning plate 311, which is detachably connected to the outer end of the conduit mounting hole 22. The positioning plate 311 is fixed to the outer end of the conduit mounting hole 22 with a fastener such as a bolt, facilitating removal and replacement.

[0041] Optionally, the valve disc 33 is coaxially arranged with the valve stem 32. Furthermore, the valve stem 32 is coaxially arranged with the valve guide 31. Furthermore, the combustion chamber end cover 1 is connected to one end of the cylinder liner 100 of the engine to be tested and is coaxially arranged with the cylinder liner 100 of the engine to be tested. This coaxial assembly facilitates processing and improves sealing.

[0042] It should be noted that in order to ensure the sealing of the combustion chamber, appropriate forms of seals can be set at the connection between the combustion chamber end cover 1 and the air duct 2, the connection between the valve guide 31 and the guide mounting hole 22, and the connection between the valve stem 32 and the valve guide 31. This form of sealing is a technical means well known to those skilled in the art and will not be repeated here.

[0043] This embodiment further provides an engine including the cylinder head as described above. By using the cylinder head, the engine testing and development cycle is shortened and the development cost is reduced.

[0044] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A cylinder head for engine testing and development, characterized in that: include: A combustion chamber end cover (1), wherein the combustion chamber end cover (1) can be removed separately; An air duct (2) is detachably connected to the combustion chamber end cover (1), and the air duct (2) can be detached separately; A valve assembly (3) comprising a valve guide (31), a valve stem (32) and a valve disc (33), wherein the valve guide (31) is detachably connected to the air passage (2), the valve stem (32) is telescopically arranged in the valve guide (31), the valve disc (33) is detachably fixed to one end of the valve stem (32), the valve disc (33) is located at one end of the air passage (2) connected to the combustion chamber end cover (1), and the valve disc (33) can be moved in a direction approaching or away from the air passage (2) under the drive of the valve stem (32) to control the amount of gas entering the air passage (2) to decrease or increase; The cylinder head further comprises an airway support (4), wherein the airway support (4) is sleeved on the airway (2); The combustion chamber end cover (1) is provided with a first connecting flange (11); the air duct (2) is provided with a second connecting flange (21) matching the first connecting flange (11), and the second connecting flange (21) is clamped between the first connecting flange (11) and the air duct bracket (4); the cylinder head further includes a fastener (5), and the fastener (5) is capable of locking or unlocking the air duct bracket (4) and the first connecting flange (11) to connect the second connecting flange (21) to the first connecting flange (11); The airway support (4) is provided with a U-shaped airway mounting groove (41).

2. The cylinder head according to claim 1, characterized in that: One end of the valve stem (32) is connected to the valve disc (33), and the other end passes through the valve guide (31) and is located outside.

3. The cylinder head according to claim 1, characterized in that The airway (2) is provided with a conduit mounting hole (22), one end of the valve conduit (31) is inserted into the conduit mounting hole (22), and the other end is provided with a positioning plate (311), and the positioning plate (311) is detachably connected to the outer end of the conduit mounting hole (22).

4. The cylinder head according to any one of claims 1 to 3, characterized in that: The valve disc (33) and the valve stem (32) are coaxially arranged.

5. The cylinder head according to claim 4, characterized in that: The valve stem (32) and the valve guide tube (31) are coaxially arranged.

6. The cylinder head according to claim 5, characterized in that: The combustion chamber end cover (1) is connected to one end of the cylinder liner (100) of the engine to be tested and is coaxially arranged with the cylinder liner (100) of the engine to be tested.

7. An engine, characterized in that: The invention comprises a cylinder head according to any one of claims 1 to 6.

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