Cylinder head offset chamfer design

Abstract

This application relates to cylinder head offset chamfer design. An engine includes a cylinder block and a cylinder head assembly. More than one cylinder is defined between the cylinder block and the cylinder head. The cylinder head assembly includes a cylinder head and more than one channel defined within the cylinder head, the channel being fluidly connected to the more than one cylinder via more than one cylinder port. Each of the cylinder ports includes a chamfered portion. The cylinder head assembly also includes more than one valve, each of the more than one valve being selectively connected to a corresponding cylinder port among the more than one cylinder ports.

Description

Technical Field

[0001] This disclosure generally relates to the cylinder head in the engine block of an internal combustion engine. Background Technology

[0002] Internal combustion engines include a cylinder head, which defines the passageways that deliver intake and exhaust air to and from the cylinders. Valves are used to selectively open and close these passageways to the cylinders and are guided to their proper positions along valve guide bores. Uneven forces on the valve (from gas entering and / or leaving the cylinder) can cause friction between the valve and the valve guide bore. Repeated friction against the valve guide bore can lead to wear. Severe guide bore wear can result in a faulty seal or valve knock, both of which may require expensive repairs or even cylinder head replacement to mitigate. Current methods for reducing valve guide wear include installing separate guides. However, this introduces additional components into the engine assembly and impacts manufacturing and assembly. Summary of the Invention

[0003] One set of embodiments relates to an engine including a cylinder block and a cylinder head assembly, wherein more than one cylinder is defined between the cylinder block and the cylinder head. The cylinder head assembly includes a cylinder head and more than one channel defined within the cylinder head, these channels being fluidly connected to the more than one cylinder via more than one cylinder port, wherein each of the cylinder ports includes a chamfered portion. The cylinder head assembly also includes more than one valve, each of the more than one valve being selectively connected to a corresponding cylinder port among the more than one cylinder port.

[0004] Another set of embodiments relates to an engine including a cylinder block and a cylinder head assembly, the cylinder block defining more than one cylinder, the cylinder head assembly including: a cylinder head; more than one channel defined within the cylinder head, the more than one channel being fluidly connected to the more than one cylinder via more than one cylinder port, wherein each of the more than one cylinder port includes a chamfered portion; and more than one valve, each of the more than one valve being selectively connected to a corresponding cylinder port among the more than one cylinder ports.

[0005] In some embodiments, the engine further includes an exhaust system fluidly connected to the more than one passage.

[0006] In some embodiments, the chamfered portion defines a central chamfer axis, which corresponds to the axis of operation along which the respective valve in one of the more than one valve operates.

[0007] In some embodiments, each of the more than one valve includes: a valve stem; and a valve head adjacent to the valve stem, wherein a corresponding chamfered portion receives the valve head.

[0008] In some embodiments, the chamfered portion corresponds to the shape of the valve head of the valve associated with a corresponding cylinder port in one of the more than one cylinder ports.

[0009] In some embodiments, each of the more than one valve forms a seal with the chamfered portion, the chamfered portion being associated with a corresponding cylinder port among the more than one cylinder ports.

[0010] In some embodiments, the chamfered portion of each of the cylinder ports is angled away from the corresponding channel in the more than one channel.

[0011] In some embodiments, the chamfered portion of the first cylinder port among the more than one cylinder port defines a first shape, and the second cylinder port among the more than one cylinder port defines a second shape, wherein the first shape is different from the second shape.

[0012] Another set of embodiments relates to an engine cylinder head assembly including a cylinder head, more than one channel defined within the cylinder head, and more than one cylinder port fluidly connected to the more than one channel. The more than one cylinder port includes a chamfered portion.

[0013] Another set of embodiments relates to an engine cylinder head assembly, the cylinder head assembly comprising: a cylinder head; more than one channel defined within the cylinder head; and more than one cylinder port fluidly connected to the more than one channel, each of the more than one cylinder port including a chamfered portion.

[0014] In some embodiments, the cylinder head assembly further defines more than one valve guide hole, wherein each of the more than one valve guide hole defines a guide hole axis.

[0015] In some embodiments, the central chamfer axis defined by each of the chamfered portions is coaxial with the guide hole axis of the corresponding valve guide hole in the more than one valve guide hole.

[0016] In some embodiments, the central chamfer axis is offset from the central channel axis by an offset distance, the central channel axis being defined by a corresponding channel among the more than one channel.

[0017] In some embodiments, the offset distance is approximately 1.3 mm.

[0018] In some embodiments, the central chamfer axis is offset by an offset angle from the corresponding channel in one of the more than one channels.

[0019] In some embodiments, the offset angle is approximately 45 degrees.

[0020] In some embodiments, the height of the chamfered portion increases from a minimum height to a maximum height along the edge of the chamfered portion.

[0021] In some embodiments, the chamfered portion protrudes away from the central channel axis of the respective channel in one of the more than one channel, and the chamfered portion protrudes further away from the central channel axis at the maximum height than at the minimum height.

[0022] In some embodiments, the chamfered portion is tapered along its height from a first width to a second width.

[0023] In some embodiments, the second width is greater than the first width.

[0024] In some embodiments, the more than one cylinder port is formed within the cylinder head.

[0025] This overview is illustrative only and is not intended to be limiting in any way. Attached Figure Description

[0026] This disclosure will become more fully understood from the following detailed description taken in conjunction with the accompanying drawings, wherein like reference numerals denote like elements, wherein:

[0027] Figure 1 This is a block diagram of an engine according to an exemplary embodiment;

[0028] Figure 2 This is a cross-sectional view of a portion of the cylinder head and valve according to an exemplary embodiment;

[0029] Figure 3 This is a cross-sectional view of the cylinder port according to an exemplary embodiment;

[0030] Figure 4 This is a bottom view of a cylinder head having more than one cylinder port according to an exemplary embodiment; and

[0031] Figure 5 yes Figure 4 A close-up bottom view of one of the cylinder ports on the cylinder head. Detailed Implementation

[0032] Before turning to the accompanying drawings, which illustrate certain exemplary embodiments in detail, it should be understood that this disclosure is not limited to the details or methods set forth in the specification or shown in the drawings. It should also be understood that the terminology used herein is for descriptive purposes only and should not be considered limiting. Examples of specific implementations and applications are provided primarily for illustrative purposes.

[0033] This document relates to a system for reducing wear in valve guide bores in the cylinder head of an internal combustion engine. In some embodiments, the cylinder head of the internal combustion engine includes offset chamfers (e.g., countersinks, fillets, etc.) in intake and / or exhaust passages guided away from more than one cylinder (e.g., combustion chambers). The offset chamfers are configured to reduce wear on the valve guide bores by guiding flow around the valve in a specific manner and thus reducing force imbalances on the valve. Each combustion chamber has at least one valve and a passage corresponding to that valve. In some embodiments, each passage includes its own system for guiding flow. In some embodiments, each offset chamfer is specifically designed for the portion of the cylinder head in which it resides.

[0034] As used herein, the term "flow" refers to intake air (e.g., air, fuel, recirculated exhaust, etc.) and / or exhaust air (e.g., carbon dioxide, unburned hydrocarbons, etc.) that can enter or leave the combustion chamber of an engine. As the flow enters and leaves the cylinder, it may exert fluid forces on the valves.

[0035] Figure 1 This is a block diagram of an engine 100 according to an exemplary embodiment. The engine 100 can be used in an engine system (e.g., a system that generates electricity using an internal combustion engine). In some embodiments, the engine 100 can be a gas engine (e.g., an engine using gasoline as fuel) or a diesel engine (e.g., an engine using diesel fuel). In some embodiments, the engine 100 can utilize natural gas (e.g., compressed natural gas, liquefied natural gas, etc.) as a fuel source. In some embodiments, the engine 100 can use more than one type of fuel (e.g., a dual-fuel engine, etc.). The engine 100 can be included in a vehicle, such as a car, truck, boat, etc. In some embodiments, the engine 100 is included in a stationary engine system (e.g., a generator, pump, etc.).

[0036] Engine 100 includes a cylinder head assembly 102 coupled to a cylinder block 104. In some embodiments, a cylinder head gasket may be inserted between the cylinder head assembly 102 and the cylinder block 104. More than one cylinder 105 (e.g., the combustion chamber) is defined within the cylinder block 104. Engine 100 may include any number (e.g., 1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, etc.) of cylinders arranged in an engine configuration (e.g., inline engine, V-type engine, flat-mounted engine, W-type engine, etc.). For example, engine 100 may be in an inline 6-cylinder configuration, wherein an inline 6-cylinder engine has six cylinders 105 arranged in a row. Engine 100 may be of any displacement size (e.g., 1L, 1.5L, 2L, 2.5L, 3L, 3.5L, 4L, 4.5L, 5L, 6L, 7L, 8L, etc.). The cylinder head assembly 102 and the cylinder block 104 are further connected to an additional engine component 106. The additional engine component 106 is a component configured for the function of the engine 100 (e.g., exhaust system, fuel injector, intake manifold, filter, camshaft, etc.) and / or a component configured to transmit or convert the power generated by the engine 100 (e.g., alternator, drive shaft, etc.).

[0037] Cylinder head assembly 102 includes a cylinder head 108 operatively coupled to more than one valve 110. In some embodiments, cylinder head assembly 102 includes only cylinder head 108. Valve 110 selectively allows or restricts flow into / out of cylinder 105 and into / out of more than one passage 112. Passage 112 may take the form of a generally tubular space defined within cylinder head 108. Passage 112 fluidly connects cylinder 105 to the intake system (e.g., filter, carburetor, etc.) and / or exhaust system (e.g., catalytic converter, exhaust gas recirculation system, etc.) of engine 100. Cylinder head 108 defines more than one valve guide hole 114 that guides valve 110 between an open position (e.g., flow can enter and / or exit cylinder 104 through passage 112) and a closed position (e.g., flow is blocked from entering and / or exiting cylinder 104 through passage 112). Valve guide bore 114 guides valve 110 to a predetermined position in cylinder head 108. Deviation from the predetermined position (e.g., possibly due to wear of valve guide bore 114) may cause engine knock, sealing defects, or other operational problems. In some embodiments, valve guide bore 114 may be lubricated with a lubricant (e.g., graphite, oil, silicone, etc.). In some embodiments, valve guide bore 114 may include an inner sleeve made of a different material than valve guide bore 114.

[0038] Figure 2This is a cross-sectional view of a cylinder head 108 and a portion of a valve 110 according to an exemplary embodiment. The valve 110 includes a valve stem 202 coupled to a valve head 204. The valve stem 202 is a cylindrical portion of the valve 110 that slides through a valve guide bore 114 when the valve is operated between an open and closed position. When the valve 110 is in the open position, flow entering and / or leaving the cylinder 104 can push the valve stem 202 against the inner wall 203 of the valve guide bore 114. This force can cause the valve stem 202 to rub against the inner wall 203 of the valve guide bore 114, causing wear and widening of the valve guide bore 114. Wear on the valve guide bore 114 can cause the valve guide bore 114 to misguide the valve 110 during operation. Such misguided guidance can lead to engine knock (e.g., knocking sounds produced by the engine), valve seal defects, or other problems that may affect the performance of the engine 100.

[0039] Valve head 204 abuts against valve stem 202. Valve head 204 includes a rounded portion that reinforces the transition between valve head 204 and valve stem 202. Valve head 204 is a disc-shaped component whose shape corresponds to cylinder port 206 of cylinder head 108. Cylinder port 206 is defined as an opening in cylinder head 108 and is the portion of cylinder head 108 that fluidly connects the cylinder to passage 112. Cylinder port 206 is configured to direct flow around valve 110 when valve 110 is in the open position. Valve 110 is selectively coupled to the corresponding cylinder port 206. Cylinder port 206 is also configured to form a seal with valve head 204 when valve 110 is in the closed position, thereby preventing cylinder contents from entering passage 112. The shape of cylinder port 206 generally corresponds to the shape of valve 110. For example, when valve 110 is circular, the cylinder port is circular. When valve 110 is in the closed position, the corresponding shape allows cylinder port 206 and valve 110 to form a seal. When valve 110 is in the open position, changes in the shape of cylinder port 206 affect how gas flows around valve 110, thereby affecting the force on valve 110. In some embodiments, cylinder port 206 includes features (e.g., fins, chamfers, fillets, etc.) that reduce eddies, recirculation, or other flow characteristics during operation. In some embodiments, cylinder port 206 and valve head 204 can be circular, elliptical, or polygonal (e.g., 3-sided, 4-sided, 5-sided, 6-sided, 7-sided, 8-sided, 9-sided, etc.) shapes. In some embodiments, the shapes of cylinder port 206 and valve head 204 can be irregular (e.g., not rectangular, square, circular, etc.) and can be specifically designed to guide flow around the valve.

[0040] Figure 3This is a cross-sectional view of cylinder port 206 according to an exemplary embodiment. Cylinder port 206 is configured to reduce net force on valve 110, which in turn reduces wear on valve guide bore 114. Cylinder port 206 includes a chamfered portion 300 configured to receive valve head 204. The chamfered portion 300 tapers along its height from a first width 302 to a second width 304. The first width 302 and the second width 304 are sized to receive valve head 204 when valve 110 is in the closed position, thereby forming a seal. In some embodiments, the second width 304 is greater than the first width 302. In some embodiments, cylinder port 206 may include additional portions with different widths. The chamfered portion 300 may taper from one width to another. For example, the chamfered portion 300 may taper from the first width 302 to the second width 304, then to a third width, and then to a fourth width. In some embodiments, cylinder port 206 includes an intermediate region 305 between the chamfered portion 300 and the channel 112. The width of the intermediate region 305 is the first width 302. The width of the intermediate region 305 may be less than, equal to, or greater than the width of the channel 112. The intermediate region 305 may include features that guide or otherwise influence the flow.

[0041] The shape of the chamfered portion 300 (e.g., chamfer angle, taper, etc.) corresponds to the shape of the valve head 204. In some embodiments, the chamfered portion 300 may include a gasket or similar feature to provide a tighter seal. The height of the chamfered portion 300, defined by the vertical height from the start to the end of the chamfer, varies along the edge of the cylinder port 206. The chamfered portion 300 includes a minimum height 306 and a maximum height 308. In some embodiments, the minimum height is opposite to the maximum height 308 (e.g., 180 degrees away from the maximum height). The height of the chamfered portion 300 increases from the minimum height 306 to the maximum height 308 along the edge of the chamfered portion 300. In some embodiments, the slope of the chamfered portion 300 (e.g., the change in height) may be linear (e.g., along a straight line), exponential (e.g., along an exponential line), etc. In some embodiments, the slope may be constant (e.g., following a pattern) or may be irregular, wherein different areas of the chamfered portion 300 follow different patterns. For example, the first part of the chamfered portion 300 may follow a linear slope, while the other part of the chamfered portion 300 may follow an exponential slope.

[0042] Compared to a cylinder port without a chamfered portion 300, the chamfered portion 300 alters how flow enters / exits the cylinder. The chamfered portion 300 allows more flow to enter through an area of ​​the chamfered portion 300 with a greater height (e.g., at a maximum height 308). The chamfered portion 300 is designed to minimize net force on valve 110 by guiding how flow moves around valve 110. In some embodiments, the edges of the chamfered portion 300 are rounded (e.g., rounded corners, etc.) or sharp, such as in countersunk holes. In some embodiments, the edges of the chamfered portion 300 may have both rounded and sharp areas. Rounded edges may be included to increase airflow around certain portions.

[0043] The chamfered portion 300 protrudes further from the channel center axis 310 at the location corresponding to the maximum height 308 than at the minimum height 306. The channel center axis 310 corresponds to the center axis of the channel 112 at the first width 302. Similar to the height of the chamfered portion 300, the extension of the chamfered portion 300 defines a slope. The slope can be constant or irregular, with different areas of the protruding chamfered portion 300 following different patterns. The width of the chamfered portion 300 defines an offset 312 as a difference between the minimum height 306 and the maximum height 308. The offset 312 is measured between the channel center axis 310 and the chamfer axis 314. The chamfer axis 314 is defined as an axis equidistant from each point along the edge of the chamfered portion 300. In some embodiments, the chamfer axis 314 corresponds to the axis along which the valve 110 operably travels and / or the center axis of the valve guide orifice 114. The offset 312 also changes how flow can enter / exit the cylinder. Offset 312 is configured for a portion of cylinder port 206 (e.g., at maximum height 308) to allow more flow through. In some embodiments, the offset distance defined by offset 312 is approximately 1.3 mm. In some embodiments, offset 312 is specifically configured for the cylinder port 206 in which it is located.

[0044] Figure 4 This is a bottom view of a cylinder head 108 having more than one cylinder port 206 according to an exemplary embodiment. The cylinder head 108 may include any number of cylinder ports 206. A cylinder port 206 may be an intake port (e.g., a port through which intake air enters the cylinder) or an exhaust port (e.g., a port through which exhaust air exits the cylinder). The configuration of the cylinder ports 206 on the cylinder head 108 corresponds to the type and requirements of the engine 100. For example, the cylinder head 208 may include one exhaust port and one intake port per cylinder. As another example, the cylinder head 208 may include two exhaust ports and two intake ports per cylinder. Each cylinder port 206 may each include a separate passage 112, or two or more cylinder ports 206 may be fluidly connected to the same passage 112. Figure 4Channel 112 is shown, which guides exhaust gas from the cylinder through cylinder port 206. Cylinder port 206 defines a primary axis 400 and a secondary axis 402. The primary axis 400 is defined as passing through chamfer axis 314 and parallel to a reference axis of cylinder head 108. For example, the reference axis of cylinder head 108 could be the length or width of cylinder head 108. The secondary axis 402 is perpendicular to the primary axis 400 and also passes through chamfer axis 314. Chamfer portion 300 defines an offset direction 404. Offset direction 404 is the direction in which offset 312 is at its maximum relative to the channel center axis 310. Chamfer portion 300 offsets away from channel 112 and further defines an offset angle 406, which is measured as a small arc between primary axis 400 and offset direction 404. The offset angle 406 can be any angle (1 degree, 2 degrees, 5 degrees, 10 degrees, 15 degrees, 30 degrees, 45 degrees, 60 degrees, 75 degrees, 90 degrees, 120 degrees, etc.). In some embodiments, when the main axis 400 is parallel to the width of the cylinder head 108, the offset angle 406 is approximately 45 degrees.

[0045] The chamfered portion 300, with an offset of 312 and an offset angle of 406, guides flow around the valve 110, minimizing the force required to push the valve stem 202 into the valve guide bore 114, thereby reducing wear on the valve guide bore 114. In some embodiments, the shape of each cylinder port 206 of the cylinder head 108 (e.g., the chamfered portion 300, the offset of 312, and the offset angle of 406) is specifically configured for the corresponding cylinder port 206 to minimize wear on the valve guide bore 114 corresponding to the cylinder port 206. For example, a first cylinder port may define a first shape, and a second cylinder port may define a second shape, wherein the first shape differs from the second shape.

[0046] Figure 5 yes Figure 4 A close-up bottom view of one of the cylinder ports 206 of the cylinder head 108. The cylinder port 206 includes a chamfered portion 300 defining an offset 312 at an offset angle 406. Figure 5 As shown, the chamfered axis 314 is coaxial with the central axis defined by the valve guide hole 114 (e.g., the valve guide hole axis). This alignment ensures that the valve 110 is aligned with the cylinder port 206.

[0047] Cylinder port 206 may be manufactured (e.g., cast, assembled, etc.) together with cylinder head 108 and thus formed within cylinder head 108, or may be formed during processing steps (e.g., milling, cutting, etc.). In some embodiments, a machine (e.g., a milling machine, lathe, drilling machine, etc.), such as a computer numerical control machine, is used to remove a portion of cylinder head 108 to form chamfered portion 300. In some embodiments, chamfered portion 300 may be a separate component fixedly joined (e.g., adhesive, welded, bolted, etc.) to cylinder head 108. In some embodiments, cylinder port 206 may include additional features for guiding flow. The additional features may have a similar purpose to the chamfered portion (e.g., guiding flow around valve 110), or may be configured for other purposes, such as reducing eddy formation, reducing weight, providing structural support, etc.

[0048] While this specification contains many specific implementation details, these should not be construed as limiting the scope of the claims, but rather as descriptions of features specific to particular embodiments. Certain features described in this specification within the context of independent embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments. Furthermore, while features may be described as functioning in certain combinations and even initially claimed in this way, one or more features from a claimed combination may be removed from that combination in some cases, and the claimed combination may involve sub-combinations or variations thereof.

[0049] As used herein with respect to numerical ranges, the terms “approximately,” “about,” “substantially,” and similar terms generally indicate + / - 10% of the disclosed value. When the terms “approximately,” “about,” “substantially,” and similar terms are applied to structural features (e.g., describing their shape, size, orientation, direction, etc.), these terms are intended to cover minor structural variations that may result from, for example, manufacturing or assembly processes, and are intended to have a broad meaning consistent with common and accepted usage by one of ordinary skill in the art to which the subject matter of this disclosure pertains. Therefore, these terms should be interpreted as indicating that non-substantial or irrelevant modifications or alterations to the described and claimed subject matter are considered to be within the scope of the disclosure set forth in the appended claims.

[0050] It should be noted that the terms “exemplary” and variations thereof used herein to describe the various embodiments are intended to indicate that such embodiments are possible examples, representatives, or illustrations of possible embodiments (and such terms are not intended to imply that such embodiments are necessarily special or excellent examples).

[0051] As used herein, the term "connection" and its variations refer to the direct or indirect linking of two components together. Such a connection can be fixed (e.g., permanent or immutable) or movable (e.g., removable or releasable). Such a connection can be achieved by directly linking two components together, by using a single intermediate component and any additional intermediate components linked to each other, or by using an intermediate component that forms a single whole with one of the two components. If "connection" or its variations are modified by an additional term (e.g., directly linked), the general definition of "connection" provided above is modified by the simple linguistic meaning of the additional term (e.g., "directly linked" means the linking of two components without any single intermediate component), resulting in a narrower definition than the general definition of "connection" provided above. Such a connection can be mechanical, electrical, or fluid.

[0052] References to element locations herein (e.g., “top,” “bottom,” “above,” “below”) are used only to describe the orientation of the various elements in the figures. It should be noted that the orientation of the various elements may differ according to other exemplary embodiments, and such variations are intended to be covered by this disclosure.

[0053] Furthermore, the term "or" is used in its inclusive sense (rather than its exclusive sense), such that, for example, when used to connect a series of elements, the term "or" means one, some, or all of the elements in that series. Unless explicitly stated otherwise, conjunctions such as "at least one of X, Y, or Z" are understood in the context to generally express that items, terms, etc., can be X, Y, Z, X and Y, X and Z, Y and Z, or X, Y, and Z (i.e., any combination of X, Y, and Z). Therefore, such conjunctions are generally not intended to imply that certain embodiments require at least one of X, at least one of Y, and at least one of Z to be present individually, unless otherwise indicated.

[0054] It is important to note that the construction and arrangement of the systems shown in the various example embodiments are illustrative in nature and not restrictive. All variations and modifications appearing within the spirit and / or scope of the described embodiments are intended to be protected. It should be understood that some features may not be essential, and embodiments lacking various features may be contemplated within the scope of this application, defined by the appended claims. When the language “part” is used, it may include a part and / or the entire item, unless specifically stated to the contrary.

[0055] Although only a few embodiments have been described in detail in this disclosure, those skilled in the art will readily recognize that many modifications are possible (e.g., variations in the size, dimensions, structure, shape and proportions of various elements, values ​​of parameters, mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described herein. For example, an element shown as integrally formed may be composed of multiple parts or elements, the positions of elements may be reversed or otherwise changed, and the nature or number of discrete elements or positions may be altered or changed. Depending on alternative embodiments, the order or sequence of any method processes may be changed or reordered. Other substitutions, modifications, variations, and omissions may also be made in the design, operating conditions, and arrangements of various exemplary embodiments without departing from the scope of this disclosure.

Claims

1. An engine system, comprising: Cylinder block, wherein the cylinder block defines more than one cylinder; as well as Cylinder head assembly, the cylinder head assembly comprising: - Cylinder head, the cylinder head defining more than one valve guide hole; - More than one channel, the more than one channel being defined within the cylinder head, the more than one channel being fluidly connected to the more than one cylinder via more than one cylinder port, wherein each of the more than one cylinder port includes: -- A chamfered portion, offset from a corresponding channel in one of the more than one channels, and defining a central chamfer axis, an offset direction, and an offset angle, wherein the central chamfer axis is defined as an axis equidistant from each point along the edge of the chamfered portion, the offset direction is the direction in which the offset is at its maximum relative to the central channel axis of the corresponding channel, and the offset angle is measured as a small arc between the main axis of the cylinder port and the offset direction, wherein the main axis is defined as a length or width passing through the central chamfer axis and parallel to the cylinder head; and - More than one valve, each of the more than one valves being selectively connected to a corresponding cylinder port in the more than one cylinder port, the chamfered portion of each of the more than one cylinder ports being configured to receive a corresponding valve head of the more than one valve, the central chamfer axis of each of the chamfered portions corresponding to the axis of operation along which the corresponding valve in the more than one valve is located, wherein the offset direction and the offset angle of each of the more than one cylinder ports are configured to guide fluid flow around the corresponding valve in the more than one valve such that the force required to push the corresponding valve stem of the corresponding valve into the corresponding valve guide hole in the more than one valve guide hole is minimized.

2. The engine system of claim 1, further comprising an exhaust system fluidly connected to the more than one passage.

3. The engine system according to claim 1, wherein, Each of the more than one valves includes: Valve stem; and A valve head, wherein the valve head is adjacent to the valve stem.

4. The engine system according to any one of claims 1-3, wherein, The chamfered portion corresponds to the shape of the valve head of the valve associated with the corresponding cylinder port in the more than one cylinder port.

5. The engine system according to claim 4, wherein, Each of the more than one valve forms a seal with the chamfered portion, which is associated with a corresponding cylinder port among the more than one cylinder ports.

6. The engine system according to claim 1, wherein, The central chamfer axis is offset from the corresponding channel in the more than one channel by the offset angle.

7. The engine system according to any one of claims 1-3 and 5, wherein, The chamfered portion of the first cylinder port in the more than one cylinder port defines a first shape, and the second cylinder port in the more than one cylinder port defines a second shape, wherein the first shape is different from the second shape.

8. A cylinder head assembly for an engine, the cylinder head assembly comprising: Cylinder head, wherein the cylinder head defines more than one valve guide hole; More than one channel, wherein the more than one channel is defined within the cylinder head; as well as More than one cylinder port, fluidly connected to more than one channel, each of the more than one cylinder ports including a chamfered portion offset from a corresponding channel in the more than one channel, the chamfered portion defining a central chamfer axis, an offset direction, and an offset angle, the central chamfer axis being defined as an axis equidistant from each point along the edge of the chamfered portion, the offset direction being the direction in which the offset is at its maximum relative to the central channel axis of the corresponding channel, the offset angle being measured as a small arc between the principal axis of the cylinder port and the offset direction, wherein the principal axis is defined as a length or width passing through the central chamfer axis and parallel to the cylinder head, wherein the chamfered portion is configured to receive a valve head, and wherein the central chamfer axis corresponds to the axis along which the valve operates, wherein the offset direction and the offset angle of each of the more than one cylinder ports are configured to guide fluid flow around a corresponding valve in more than one valve such that the force required to push the corresponding valve stem of the corresponding valve into a corresponding valve guide hole in more than one valve guide hole is minimized.

9. The cylinder head assembly according to claim 8, wherein, The central chamfer axis defined by each of the chamfered portions is coaxial with the guide hole axis of the corresponding valve guide hole in the more than one valve guide hole.

10. The cylinder head assembly according to claim 9, wherein, The central chamfer axis is offset from the central channel axis by an offset distance.

11. The cylinder head assembly according to claim 10, wherein, The offset distance is approximately 1.3 millimeters.

12. The cylinder head assembly according to claim 9, wherein, The central chamfer axis is offset from the corresponding channel in the more than one channel by the offset angle.

13. The cylinder head assembly according to claim 12, wherein, The offset angle is approximately 45 degrees.

14. The cylinder head assembly according to any one of claims 8-13, wherein, The height of the chamfered portion increases from a minimum height to a maximum height along the edge of the chamfered portion.

15. The cylinder head assembly according to claim 14, wherein, The chamfered portion protrudes away from the central channel axis of the corresponding channel in the more than one channel, and the chamfered portion protrudes further away from the central channel axis at the maximum height than at the minimum height.

16. The cylinder head assembly according to any one of claims 8-13 and 15, wherein, The chamfered portion is tapered from the first width to the second width along its height.

17. The cylinder head assembly according to claim 16, wherein, The second width is greater than the first width.

18. The cylinder head assembly according to any one of claims 8-13, 15 and 17, wherein, The more than one cylinder port is formed within the cylinder head.

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