Cylinder cover and engine

Abstract

The utility model discloses a cylinder cover which comprises a cylinder cover body, the cylinder cover body is provided with a cooling water jacket, the cooling water jacket comprises an upper water jacket and a lower water jacket, and the upper water jacket and the lower water jacket are communicated through a throttling cavity. According to the cylinder cover disclosed by the scheme, the flow guide part is arranged on at least one of the discharging nose bridge area and the feeding and discharging nose bridge area of the cylinder cover body, and the rectification part is arranged on the bottom plate of the lower water jacket. The flow guide part protrudes out of the lower surface of the nose bridge area and is used for guiding the cooling liquid towards the bottom plate of the lower water jacket, so that the amount of the cooling liquid flowing to the bottom plate of the cylinder cover body is increased, and the heat exchange efficiency of the bottom plate of the cylinder cover body is improved; after the cooling liquid reaches the rectifying part through the flow guide part, the cooling liquid flows along with the shape of the rectifying part, so that part of the cooling liquid generates vortexes at the position of the rectifying part, disturbance of the cooling liquid is increased, heat of the cooling liquid can be better released, and heat exchange between the cooling liquid and a bottom plate of the cylinder cover body is enhanced; the cooling effect on the bottom plate of the cylinder cover body can be optimized.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a cylinder head and an engine. Background Art

[0002] In related art, the cooling water jacket of an engine cylinder head consists of an upper water jacket and a lower water jacket, with cooling water flowing from the upper water jacket to the lower water jacket. The lower water jacket is closer to the engine block's floor than the upper water jacket. As part of the combustion chamber, the cylinder head's floor is directly impacted by the combustion surface, resulting in a higher temperature.

[0003] Therefore, how to enhance the cooling effect on the base plate of the cylinder head becomes a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0004] The present application proposes a cylinder head to enhance the cooling effect on a bottom plate of the cylinder head.

[0005] In order to achieve the above object, the present application provides a cylinder head, comprising a cylinder head body, wherein the cylinder head body has a cooling water jacket, wherein the cooling water jacket comprises an upper water jacket and a lower water jacket, wherein the upper water jacket and the lower water jacket are connected through a throttling cavity.

[0006] At least one of the row nose bridge area and the intake and exhaust nose bridge area of ​​the cylinder head body has a guide portion protruding from the lower surface of the nose bridge area, which is used to guide the coolant to the bottom plate of the lower water jacket.

[0007] The bottom plate of the lower water jacket has a rectifying portion, which is recessed in the surface of the bottom plate and is used to increase the disturbance of the coolant.

[0008] Preferably, in the above cylinder head, the angle between the front face of the air guide portion and the axis of the cylinder head body is smaller than the angle between the rear face of the air guide portion and the axis of the cylinder head body.

[0009] Preferably, in the above cylinder head, the guide surface of the guide portion is an arc-shaped surface.

[0010] Preferably, in the above cylinder head, the radius of the arc where the flow-facing surface of the guide portion is located is 4 mm-10 mm; and / or,

[0011] The distance between the center of the arc where the flow-facing surface of the guide portion is located and the axis of the cylinder head body is 10 mm to 15 mm; and / or,

[0012] The distance between the center of the arc where the flow-facing surface of the guide portion is located and the air intake plane of the cylinder head body is 30-40 mm.

[0013] Preferably, in the above cylinder head, the radius of the arc where the flow-facing surface of the guide portion of the row nose bridge area is located is greater than the radius of the arc where the flow-facing surface of the guide portion of the intake and exhaust nose bridge area is located; and / or,

[0014] The distance between the guide portion of the row nose bridge area and the axis of the cylinder head body is smaller than the distance between the guide portion of the intake and exhaust nose bridge area and the axis of the cylinder head body.

[0015] Preferably, in the above cylinder head, the rectifying portion includes a protruding portion and a recessed portion, the protruding portion is located upstream of the recessed portion, and the radius of the arc where the protruding portion is located is smaller than the radius of the arc where the recessed portion is located.

[0016] Preferably, in the above cylinder head, the radius of the arc where the raised portion is located is 2 mm to 5 mm, and the radius of the arc where the recessed portion is located is 4 to 8 mm; and / or,

[0017] The distance between the center of the arc where the protrusion is located and the air intake plane of the cylinder head body is 25mm-35mm, and the distance between the center of the arc where the recess is located and the air intake plane of the cylinder head body is 20mm-30mm; and / or,

[0018] The distance between the center of the arc where the protrusion is located and the axis of the cylinder head body is 30mm-40mm, and the distance between the center of the arc where the recess is located and the axis of the cylinder head body is 40mm-50mm.

[0019] Preferably, in the above cylinder head, the recessed portion is located in the tangent direction of the arc where the flow-facing surface of the air guide portion is located, and the recessed portion and the air guide portion are located on the same side of the tangent.

[0020] Preferably, in the above cylinder head, the angle between the tangent line and the axis of the cylinder head body is 30°-60°.

[0021] An engine includes a cylinder head, wherein the cylinder head is the cylinder head described in any one of the above solutions.

[0022] The cylinder head provided in an embodiment of the present application includes a cylinder head body having a cooling water jacket, which includes an upper water jacket and a lower water jacket, the upper and lower water jackets being connected via a throttle cavity. The cylinder head disclosed in this solution has a flow guide provided on at least one of the discharge nose bridge area and the intake and discharge nose bridge area of ​​the cylinder head body, and the bottom plate of the lower water jacket has a flow straightening portion. The guide portion is provided on the lower surface of the nose bridge area and is used to guide the coolant toward the bottom plate of the lower water jacket, so as to increase the amount of coolant flowing to the bottom plate of the cylinder head body and improve the heat exchange efficiency of the bottom plate of the cylinder head body; after the coolant reaches the rectifying portion through the guide portion, the coolant flows along the outer shape of the rectifying portion, so that part of the coolant generates vortexes at the rectifying portion, increasing the disturbance of the coolant and enabling the heat of the coolant to be better released. Compared with the way in which the water flow always flows smoothly, the coolant close to the water jacket and the nose bridge area always plays a cooling role, while the coolant far away from the water jacket and the nose bridge area cannot effectively play a cooling role. The lower water jacket with a rectifying portion disclosed in this solution can disturb the water flow, enhance the heat exchange between the coolant and the bottom plate of the cylinder head body, and optimize the cooling effect on the bottom plate of the cylinder head body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the embodiments or prior art descriptions. Obviously, the drawings described below are only some examples or embodiments of the present application. For those of ordinary skill in the art, without paying any creative work, other drawings can be obtained based on the provided drawings, and the present application can also be applied to other similar scenarios based on the provided drawings. Unless it is obvious from the language context or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0024] Figure 1 is a cross-sectional view of the cylinder head of the present application;

[0025] Figure 2 It is a top view of the cylinder head of the present application;

[0026] Figure 3 It is a structural diagram of the lower water jacket of the cylinder head of the present application;

[0027] Figure 4 It is a structural diagram of the lower water jacket of the cylinder head of the present application;

[0028] Figure 5 It is a partial enlarged view of the guide part and the rectifying part of the cylinder head of the present application.

[0029] The accompanying drawings are as follows:

[0030] 1-cylinder head body; 2-upper water jacket; 3-lower water jacket; 4-throttle cavity; 5-flow guide; 6-rectifier; 61-raised part; 62-recessed part. DETAILED DESCRIPTION

[0031] The present application will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are merely for explaining the related application and are not intended to limit the application. The described embodiments are merely a portion of the embodiments of the present application and are not intended to be exhaustive. All other embodiments derived by persons of ordinary skill in the art based on the embodiments in the present application without creative effort are intended to fall within the scope of protection of the present application.

[0032] It should be noted that, for ease of description, only the portions relevant to the relevant applications are shown in the accompanying drawings. In the absence of conflict, the embodiments and features in the embodiments of this application may be arbitrarily combined with each other, as long as the combined technical features are not mutually contradictory. All feasible feature combinations are technical contents explicitly described herein. Any of the multiple sub-features contained in the same statement can be applied independently, and does not necessarily have to be applied together with other sub-features.

[0033] As used in this application and the claims, unless the context clearly indicates an exception, the terms "a," "an," "an," and / or "the" are not intended to refer to the singular and may include the plural, unless the context clearly indicates otherwise. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements. The phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, product, or apparatus that includes the elements.

[0034] In the description of the embodiments of this application, unless otherwise specified, " / " represents or. For example, A / B can represent A or B. "And / or" in this article is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of this application, "plurality" means two or more than two.

[0035] See also Figure 1-Figure 5 .

[0036] Some embodiments of the present application disclose a cylinder head comprising a cylinder head body 1 having a cooling water jacket, the cooling water jacket comprising an upper water jacket 2 and a lower water jacket 3, the upper and lower water jackets 2 and 3 being connected via a throttle cavity 4. The cooling water jacket disclosed in this embodiment is suitable for top-down cooling. The throttle cavity 4 diverts coolant flowing from the upper water jacket 2 to different areas of the lower water jacket 3 at a preset flow rate, thereby cooling the various nose bridge areas of the cylinder head.

[0037] An engine typically has two intake ducts and two exhaust ducts. An inlet nose section forms between the two intake ducts, and a row nose section forms between the two exhaust ducts. The inlet nose section is formed between one intake duct and the exhaust duct corresponding to that intake duct, while the inlet nose section is formed between the other intake duct and the exhaust duct corresponding to that intake duct. This means the engine has four nose sections: the inlet nose section, the row nose section, and the two inlet nose sections. Due to the layout of the intake and exhaust ducts, the row nose section between two adjacent exhaust ducts has the highest temperature, while the inlet nose section between two adjacent intake ducts has the lowest temperature.

[0038] The cylinder head disclosed in this embodiment is provided with a guide portion 5 in the row-by-row nose bridge area and / or the inlet-by-exhaust nose bridge area of ​​the cylinder head body 1. Specifically, the guide portion 5 may be provided only in the row-by-row nose bridge area, or in at least one inlet-by-exhaust nose bridge area, or in both the row-by-row nose bridge area and the inlet-by-exhaust nose bridge area. Preferably, the guide portion 5 is provided in both the row-by-row nose bridge area and the inlet-by-exhaust nose bridge area.

[0039] In some embodiments, a guide portion 5 may also be provided in the nose bridge area.

[0040] The guide portion 5 is provided on the lower surface of the nose bridge area (the nose bridge area is a general term for the row nose bridge area and / or the inlet and outlet nose bridge area). The guide portion 5 is used to guide the coolant entering the lower water jacket 3 and to guide the coolant to the bottom plate of the lower water jacket 3; at the same time, the bottom plate of the lower water jacket 3 has a rectifying portion 6, which is located downstream of the guide portion 5. The rectifying portion 6 is recessed in the surface of the bottom plate to increase the disturbance of the coolant.

[0041] The coolant flowing to the bottom plate of the lower water jacket 3 is guided to be directed to the water outlet. The bottom plate of the lower water jacket 3 is the bottom plate of the cylinder head body 1.

[0042] The guide portion 5 is provided on the lower surface of the nose bridge area and is used to guide the coolant toward the bottom plate of the lower water jacket 3 to increase the amount of coolant flowing to the bottom plate of the cylinder head body 1 and improve the heat exchange efficiency of the bottom plate of the cylinder head body 1. At the same time, the protruding guide portion 5 shortens the distance between the nose bridge area and the bottom plate of the lower water jacket 3, so that the flow rate of the coolant passing through the guide portion 5 and the bottom plate of the lower water jacket 3 is accelerated, further improving the heat exchange efficiency of the bottom plate of the cylinder head body 1, and optimizing the cooling effect on the bottom plate of the cylinder head body 1.

[0043] After the coolant passes through the guide part 5 and reaches the rectifying part 6, the coolant flows along the outer shape of the rectifying part 6, so that part of the coolant generates a vortex at the position of the rectifying part 6, increasing the disturbance of the coolant and allowing the heat of the coolant to be better released. Compared with the way that the water flow always flows smoothly, the coolant close to the water jacket and the nose bridge area always plays a cooling role, while the coolant far away from the water jacket and the nose bridge area cannot effectively play a cooling role. The lower water jacket 3 with the rectifying part 6 disclosed in this scheme can disturb the water flow, enhance the heat exchange between the coolant and the bottom plate of the cylinder head body 1, and optimize the cooling effect on the bottom plate of the cylinder head body 1.

[0044] In this solution, the guide portion 5 is located upstream of the rectifying portion 6. The coolant first passes through the guide portion 5 and then through the rectifying portion 6. The guide portion 5 directs the coolant in the lower water jacket 3 near the upper water jacket 2 toward the bottom plate of the lower water jacket 3, thereby increasing the amount of coolant cooling the bottom plate of the lower water jacket 3, i.e., the bottom plate of the cylinder head body 1. The rectifying portion 6 turbulently disrupts the coolant flow on the bottom plate, allowing more coolant to exchange heat with the bottom plate of the cylinder head body 1, thereby optimizing the cooling effect on the bottom plate of the cylinder head body 1.

[0045] The guide surface of the guide portion 5 has a front face and a back face. The front face is used to guide the coolant, and the back face does not guide the coolant. The front face and the back face can be symmetrical or asymmetrical. Figure 1 As shown, it is an embodiment in which the upstream surface and the downstream surface are asymmetrically arranged, and the angle between the upstream surface of the guide portion 5 and the axis of the cylinder head body 1 is smaller than the angle between the downstream surface of the guide portion 5 and the axis of the cylinder head body 1, so as to enhance the guiding effect of the upstream surface on the coolant.

[0046] Optionally, the angle between the frontal surface and the axis of the cylinder head body 1 is 40°-60°.

[0047] There is a smooth transition between the frontal surface of the flow guide portion 5 and the nose bridge area, and there is also a smooth transition between the rear surface of the flow guide portion 5 and the nose bridge area.

[0048] like Figure 3 、 Figure 4 and Figure 5 As shown, the upstream surface is an inwardly concave arc surface, the downstream surface is an outwardly convex arc surface, and the connection position between the upstream surface and the downstream surface is also in an arc shape.

[0049] The guide surface of the guide portion 5 is an arc-shaped surface, which can reduce the difficulty of demoulding the guide portion 5 with the cylinder head.

[0050] The radius R1 (or R2) of the arc on which the flow-facing surface of the guide portion 5 is located is 4 mm to 10 mm; and / or, the distance L1 (or L2) between the center of the arc on which the flow-facing surface of the guide portion 5 is located and the axis of the cylinder head body 1 is 10 mm to 15 mm; and / or, the distance H1 (or H2) between the center of the arc on which the flow-facing surface of the guide portion 5 is located and the intake plane of the cylinder head body 1 is 30 mm to 40 mm.

[0051] The radius R1 of the arc where the flow-facing surface of the guide portion 5 is located is set to 4 mm-10 mm, which does not affect the strength of the water jacket while ensuring the guiding effect on the coolant.

[0052] Optionally, the guide portion 5 is arranged in the row nose bridge area and the inlet nose bridge area close to the throttling cavity 4. The number of guide portions 5 arranged on the row nose bridge area and the inlet nose bridge area is not limited to one, and can be multiple.

[0053] The two air guides 5 in the nose bridge area are symmetrically arranged.

[0054] Since the temperature of the row-row nose bridge area is higher than that of the inlet-outlet nose bridge area, the radius of the circular arc where the flow-facing surface of the guide portion 5 of the row-row nose bridge area is located is larger than the radius of the circular arc where the flow-facing surface of the guide portion 5 of the inlet-outlet nose bridge area is located, so as to increase the length of the flow-facing surface of the guide portion 5 of the row-row nose bridge area and enhance the flow-guiding capacity of the coolant; and / or,

[0055] The distance between the guide part 5 in the row nose bridge area and the axis of the cylinder head body 1 is smaller than the distance between the guide part 5 in the intake and exhaust nose bridge area and the axis of the cylinder head body 1, so that the coolant can be guided earlier, so that more coolant can be guided to the bottom plate of the lower water jacket 3 earlier, thereby enhancing the cooling effect on the bottom plate of the lower water jacket 3.

[0056] like Figure 3 、 Figure 4 and Figure 5 As shown, the rectifying portion 6 includes a protrusion 61 and a recessed portion 62. The protrusion 61 is located upstream of the recessed portion 62. The protrusion 61 is closer to the throttling cavity 4 than the recessed portion 62. The radius of the arc where the protrusion 61 is located is smaller than the radius of the arc where the recessed portion 62 is located. The coolant guided to the bottom plate of the lower water jacket 3 first passes through the protrusion 61 and then passes through the recessed portion 62. The coolant first moves toward the nose bridge area and then moves toward the bottom plate of the lower water jacket 3. The height of the coolant falling to the bottom plate of the lower water jacket 3 is raised, thereby enhancing the disturbance effect on the coolant and the heat exchange between the coolant and the bottom plate of the cylinder head body 1, thereby optimizing the cooling effect on the bottom plate of the cylinder head body 1.

[0057] The raised portion 61 cooperates with the guide portion 5 to narrow the flow path of the coolant before it passes through the recessed portion 62, thereby increasing the flow rate of the coolant and improving the heat exchange efficiency.

[0058] The radius of the arc where the protrusion 61 is located is smaller than the radius of the arc where the recessed portion 62 is located, so as to increase the falling height of the coolant and enhance the turbulent flow effect of the coolant.

[0059] The radius R3 (or R5) of the arc where the raised portion 61 is located is 2 mm to 5 mm, and the radius R4 (or R6) of the arc where the recessed portion 62 is located is 4 to 8 mm; and / or,

[0060] The distance H4 (or H6) between the center of the arc where the protrusion 61 is located and the intake plane of the cylinder head body 1 is 25mm-35mm, and the distance H3 (or H5) between the center of the arc where the recessed portion 62 is located and the intake plane of the cylinder head body 1 is 20mm-30mm; and / or,

[0061] The distance L3 (or L4) between the center of the arc where the protrusion 61 is located and the axis of the cylinder head body 1 is 30mm-40mm, and the distance L5 (or L6) between the center of the arc where the recessed portion 62 is located and the axis of the cylinder head body 1 is 40mm-50mm.

[0062] The two inlet and outlet nose bridge areas are symmetrically arranged corresponding to the rectifying portion 6 of the bottom plate of the lower water jacket 3.

[0063] Since the temperature of the row nose bridge area is higher than that of the inlet and outlet nose bridge area, the radius of the rectifying portion 6 of the bottom plate of the lower water jacket 3 corresponding to the row nose bridge area can be larger than the rectifying portion 6 of the bottom plate of the lower water jacket 3 corresponding to the inlet and outlet nose bridge area, so as to enhance the turbulence of the coolant and improve the cooling effect on the bottom plate of the lower water jacket 3.

[0064] The distribution of coolant in the row nose bridge area and the inlet nose bridge area is affected by the throttling cavity 4. The throttling cavity 4 is in the shape of a plum petal. The design of the guide part 5 and the rectifying part 6 needs to take into account the diversion of the throttling cavity 4.

[0065] The recessed portion 62 is located in the tangent direction of the arc where the flow-facing surface of the guide portion 5 is located. The recessed portion 62 and the guide portion 5 are located on the same side of the tangent. The coolant after being guided by the flow-facing surface enters the recessed portion 62 through the top of the protrusion 61. The flow-facing surface and the recessed portion 62 cooperate to guide the coolant and reduce the flow resistance of the coolant.

[0066] In some embodiments, the angle β between the tangent line and the axis of the cylinder head body 1 is 30°-60°.

[0067] This solution also discloses an engine, including a cylinder head, which is the cylinder head described in any one of the above solutions.

[0068] Since the cylinder head has the above-mentioned technical effects, the engine having the cylinder head also has the same technical effects, which will not be described in detail here.

[0069] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed, and is not intended to limit the present application. For those skilled in the art, various modifications and variations of the present application are possible. The scope of application involved in the present application is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned application concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A cylinder head, characterized in that: The invention comprises a cylinder head body (1), wherein the cylinder head body (1) has a cooling water jacket, wherein the cooling water jacket comprises an upper water jacket (2) and a lower water jacket (3), wherein the upper water jacket (2) and the lower water jacket (3) are connected via a throttling cavity (4). At least one of the row nose bridge area and the intake nose bridge area of ​​the cylinder head body (1) has a guide portion (5) protruding from the lower surface of the nose bridge area, which is used to guide the coolant to the bottom plate of the lower water jacket (3). The bottom plate of the lower water jacket (3) has a rectifying portion (6), and the rectifying portion (6) is recessed in the surface of the bottom plate and is used to increase the disturbance of the coolant.

2. The cylinder head according to claim 1, characterized in that: The angle between the front face of the flow guide portion (5) and the axis of the cylinder head body (1) is smaller than the angle between the rear face of the flow guide portion (5) and the axis of the cylinder head body (1).

3. The cylinder head according to claim 1, characterized in that The flow guiding surface of the flow guiding portion (5) is an arc-shaped surface.

4. The cylinder head according to claim 1, characterized in that The radius of the arc on which the flow-facing surface of the guide portion (5) is located is 4 mm to 10 mm; and / or, The distance between the center of the arc where the flow-facing surface of the guide portion (5) is located and the axis of the cylinder head body (1) is 10 mm to 15 mm; and / or, The distance between the center of the arc where the flow-facing surface of the guide portion (5) is located and the air intake plane of the cylinder head body (1) is 30-40 mm.

5. The cylinder head according to claim 1, characterized in that: The radius of the circular arc where the flow-facing surface of the guide portion (5) in the row nose bridge area is located is greater than the radius of the circular arc where the flow-facing surface of the guide portion (5) in the inlet nose bridge area is located; and / or, The distance between the guide portion (5) of the row nose bridge area and the axis of the cylinder head body (1) is smaller than the distance between the guide portion (5) of the intake and exhaust nose bridge area and the axis of the cylinder head body (1).

6. The cylinder head according to claim 1, characterized in that The rectifying portion (6) comprises a raised portion (61) and a recessed portion (62), the raised portion (61) being located upstream of the recessed portion (62), and the radius of the arc where the raised portion (61) is located being smaller than the radius of the arc where the recessed portion (62) is located.

7. The cylinder head according to claim 6, characterized in that: The radius of the arc where the raised portion (61) is located is 2 mm to 5 mm, and the radius of the arc where the recessed portion (62) is located is 4 mm to 8 mm; and / or, The distance between the center of the arc where the protrusion (61) is located and the air intake plane of the cylinder head body (1) is 25mm-35mm, and the distance between the center of the arc where the recess (62) is located and the air intake plane of the cylinder head body (1) is 20mm-30mm; and / or, The distance between the center of the arc where the raised portion (61) is located and the axis of the cylinder head body (1) is 30 mm to 40 mm, and the distance between the center of the arc where the recessed portion (62) is located and the axis of the cylinder head body (1) is 40 mm to 50 mm.

8. The cylinder head according to claim 6, characterized in that: The recessed portion (62) is located in the tangent direction of the circular arc where the flow-facing surface of the flow-guiding portion (5) is located, and the recessed portion (62) and the flow-guiding portion (5) are located on the same side of the tangent.

9. The cylinder head according to claim 8, characterized in that: The angle between the tangent line and the axis of the cylinder head body (1) is 30°-60°.

10. An engine, characterized in that: It comprises a cylinder head, wherein the cylinder head is the cylinder head according to any one of claims 1 to 9.

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