Engine cylinder cover and engine
By designing asymmetrical intake ducts and rocker arms with different rocker arm ratios in the engine cylinder head, vortices are created, solving the problem of incomplete combustion in large-bore engines and achieving the effect of reducing gas consumption and emissions.
Patent Information
- Application Number
- CN202423312150.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Large-bore engines have difficulty generating circumferential vortices in the cylinder during combustion, resulting in a long duration of the later stages of combustion, incomplete combustion, high gas consumption and emissions, and an inability to meet the requirements for reducing gas consumption and emissions.
Design an engine cylinder head that employs asymmetrical first and second intake ports and first and second rocker arms with different rocker arm ratios. By creating vortices through differentiated valve movements, the in-cylinder combustion effect is enhanced, and the transmission mechanism is simplified by combining an overhead camshaft.
By building vortexes on the basis of tumble flow, combustion speed and efficiency are improved, while engine gas consumption and emissions are reduced.
Smart Images
Figure CN223562927U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of engines, in particular to an engine cylinder cover and an engine. BACKGROUND
[0002] Rolling flow is beneficial to improve the center turbulent kinetic energy in the cylinder, accelerate the development speed of the initial fire core, and improve the thermal efficiency of the engine. For large-bore engines (referring to engines with a cylinder diameter exceeding 150 mm), parallel air ducts are used to construct rolling flow, but it is difficult to generate circumferential vortex flow in the cylinder. As the combustion process develops, the rolling flow effect gradually weakens, and the flame develops slowly in the later stage, resulting in a long combustion duration and incomplete combustion in the later stage, high gas consumption and high emissions, which do not meet the needs of modern engines to reduce gas consumption and emissions.
[0003] Therefore, how to reduce the gas consumption and emissions of the engine has become a technical problem to be solved by those skilled in the art. CONTENT OF THE UTILITY MODEL
[0004] The present application provides an engine cylinder cover to reduce the gas consumption and emissions of the engine. The present application also provides an engine.
[0005] In order to achieve the above-mentioned purpose, the present application provides an engine cylinder cover, comprising:
[0006] The engine cylinder cover has a canopy structure surrounding a combustion chamber with a piston and a cylinder of the engine;
[0007] A first air inlet and a second air inlet are located on the first side of the ridge line of the canopy structure and are symmetrically distributed, and the first air inlet and the second air inlet are rolling air inlets;
[0008] A first valve and a second valve are installed in the first air inlet and the second air inlet, respectively;
[0009] A first rocker arm and a second rocker arm are rotatable around a rocker shaft, and each of the first rocker arm and the second rocker arm has a driving end and a driven end on both sides of the rocker shaft, the driving end of the first rocker arm and the driving end of the second rocker arm are matched with a camshaft, the driven end of the first rocker arm and the driven end of the second rocker arm are connected with the first valve and the second valve, respectively, the first distance a1 between the driving end of the first rocker arm and the driving end of the second rocker arm is equal to the first distance a1 between the driving end of the first rocker arm and the driving end of the second rocker arm, the ratio of the second distance b2 between the driven end of the first rocker arm and the rocker shaft to the first distance a1 is the first rocker arm ratio b2 / a1, the ratio of the third distance b1 between the driven end of the second rocker arm and the rocker shaft to the first distance a1 is the second rocker arm ratio b1 / a1, and the first rocker arm ratio b2 / a1 is different from the second rocker arm ratio b1 / a1.
[0010] Preferably, in the engine head described above, the first rocker arm ratio b2 / a1 is greater than the second rocker arm ratio b1 / a1.
[0011] Preferably, in the engine head described above, the first rocker arm ratio b2 / a1 is less than 1.7 and the second rocker arm ratio b1 / a1 is greater than 1.2.
[0012] Preferably, in the engine head described above, the first rocker arm and the second rocker arm share the driving end.
[0013] Preferably, in the engine head described above, the center line of the valve seat circle of the first valve and the second valve is parallel to the roof ridge line, and the first valve and the second valve form an included angle θ at the end away from the valve seat circle.
[0014] Preferably, in the engine head described above, the included angle θ satisfies 3°<θ<8°.
[0015] Preferably, in the engine head described above, the maximum lift H1 of the first valve and the maximum lift H2 of the second valve satisfy 0.5H1<H2<H1.
[0016] Preferably, in the engine head described above, the first valve and the second valve are opened and closed simultaneously.
[0017] Preferably, in the engine head described above, the first exhaust passage and the second exhaust passage on the second side of the roof ridge line of the roof structure are symmetrically distributed.
[0018] An engine comprising an engine head, wherein the engine head is the engine head described in any one of the above aspects.
[0019] Preferably, in the engine described above, the camshaft driving the first rocker arm and the second rocker arm of the engine head is a top camshaft.
[0020] The engine cylinder cover disclosed in the scheme comprises a dome structure, a first air inlet, a second air inlet, a first valve, a second valve, a first rocker arm and a second rocker arm. The first air inlet and the second air inlet are symmetrically arranged on the first side of the ridge line of the dome structure. The first valve is arranged on the first air inlet, and the second valve is arranged on the second air inlet. The first rocker arm and the second rocker arm drive the first valve and the second valve to move, respectively. The first rocker arm ratio of the first rocker arm and the second rocker arm ratio of the second rocker arm are different. The first valve and the second valve have an included angle in the direction perpendicular to the ridge line of the dome. The first rocker arm and the second rocker arm drive the first valve and the second valve to move synchronously under the action of the camshaft. Because the first rocker arm ratio of the first rocker arm and the second rocker arm ratio of the second rocker arm are different, the movement height and the opening degree of the first valve and the second valve are different. The asymmetric rolling flow capacity of the first air inlet and the second air inlet is realized. After the vortex component of the air inlet with large flow and the air inlet with small flow is offset, the vortex movement form still exists to build vortex on the basis of rolling flow, realize oblique shaft rolling flow, accelerate combustion in the cylinder, and reduce the emission and gas consumption of the engine.
[0021] The scheme also discloses an engine comprising the engine cylinder cover. Because the engine cylinder cover has the above technical effects, the engine with the engine cylinder cover also has the same technical effects, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some examples or embodiments of the present application. For those skilled in the art, other drawings can be obtained without creative labor on the basis of the provided drawings, and the present application can also be applied to other similar scenarios on the basis of the provided drawings. Unless it is obvious from the language environment or otherwise stated, the same reference numerals in the drawings represent the same structure or operation.
[0023] Figure 1 is a structural schematic diagram of the engine cylinder cover of the present application;
[0024] Figure 2 is a top view of the engine cylinder cover of the present application;
[0025] Figure 3 is a structural schematic diagram of the common driving end of the first rocker arm and the second rocker arm of the engine cylinder cover of the present application;
[0026] Figure 4 is a valve lift curve of the first valve and the second valve of the engine cylinder cover of the present application.
[0027] The drawings are described as follows:
[0028] 1 - roof structure; 2 - first intake port; 3 - second intake port; 4 - roof ridge line; 5 - first valve; 6 - second valve; 7 - first rocker arm; 8 - second rocker arm; 9 - valve seat circle center line; 10 - first exhaust port; 11 - second exhaust port; 12 - camshaft. DETAILED DESCRIPTION
[0029] The application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, but not to limit the application. The described embodiments are only a part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the application.
[0030] It should be noted that, for the convenience of description, only the parts related to the application are shown in the drawings. The embodiments in the application and the features in the embodiments can be combined with each other arbitrarily without conflict, as long as the combined technical features are not contradictory. All feasible feature combinations are the technical content explicitly described herein. Any one of the multiple features contained in the same sentence can be applied independently, and does not have to be applied together with other features.
[0031] As shown in the application and claims, unless the context clearly indicates otherwise, "one", "a", "an", and / or "the" do not refer to the singular, but can also include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements. The element defined by the phrase "comprising a" does not exclude the presence of another identical element in the process, method, product or device comprising the element.
[0032] In the description of the embodiments of the application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" herein is only a description of the association between the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, in the description of the embodiments of the application, "multiple" means two or more than two.
[0033] In the related art, two intake ports of a cylinder are usually arranged in parallel, and the intake ports are tumble flow intake ports, which are helpful to form tumble flow in the cylinder, but the two intake ports are symmetrically distributed about the main axis of the cylinder, so that the vortex components formed by the two intake ports offset each other, and it is difficult to generate vortex flow in the cylinder.
[0034] Tumble flow can drive airflow to rotate along the direction perpendicular to the axis of the cylinder, and vortex flow can drive airflow close to the cylinder wall to rotate around the axis of the cylinder. Properly increasing vortex flow can increase the movement intensity of gas around the cylinder wall, promote natural gas combustion around the cylinder wall, increase the combustion speed in the late combustion stage, make the combustion more sufficient, and achieve the purposes of reducing emissions and improving thermal efficiency.
[0035] Please refer to Figures 1-4 .
[0036] The engine cylinder head disclosed in the scheme has a canopy structure 1 surrounding a combustion chamber with pistons and cylinders of an engine, a first side of a canopy ridge line 4 of the canopy structure 1 is provided with a first intake port 2 and a second intake port 3, the first intake port 2 and the second intake port 3 are symmetrically arranged relative to a plane perpendicular to and bisecting the canopy ridge line 4, and the first intake port 2 and the second intake port 3 are equidistant from the canopy ridge line 4.
[0037] The first intake port 2 and the second intake port 3 are tumble flow intake ports, and the tumble flow intake port is composed of a flow guiding section and a flow guiding section connected in sequence in the intake direction, the flow guiding section is arranged obliquely downward, and the flow guiding section is arranged at an angle of less than 90° with the bottom surface of the engine cylinder head.
[0038] The first intake port 2 and the second intake port 3 are respectively provided with a first valve 5 and a second valve 6, the first valve 5 is lifted or pressed by a first rocker arm 7, and the second valve 6 is lifted or pressed by a second rocker arm 8, specifically, when the first rocker arm 7 drives the first valve 5 to press down, the first intake port 2 is opened, when the first rocker arm 7 drives the first valve 5 to lift, the first intake port 2 is closed, when the second rocker arm 8 drives the second valve 6 to press down, the second intake port 3 is opened, and when the second rocker arm 8 drives the second valve 6 to lift, the second intake port 3 is closed.
[0039] The first rocker arm 7 and the second rocker arm 8 are both rotated around a rocker arm shaft, the axis of the rocker arm shaft is parallel to the canopy ridge line 4, and the first rocker arm 7 and the second rocker arm 8 are perpendicular to the canopy ridge line 4.
[0040] The portions of the first rocker arm 7 located at the two ends of the rocker shaft are the driving end and the driven end of the first rocker arm 7 respectively, and the portions of the second rocker arm 8 located at the two ends of the rocker shaft are the driving end and the driven end of the second rocker arm 8 respectively. The driven ends of the first rocker arm 7 and the second rocker arm 8 are connected with the first valve 5 and the second valve 6 respectively. The first distance a1 between the driving end of the first rocker arm 7 and the driving end of the second rocker arm 8 and the rocker arm is equal. The second distance b2 between the driven end of the first rocker arm 7 and the rocker shaft is different from the third distance b1 between the driven end of the second rocker arm 8 and the rocker shaft. The ratio of the second distance b2 to the first distance a1 is the first rocker arm ratio b2 / a1, and the ratio of the third distance b1 to the first distance a1 is the second rocker arm ratio b1 / a1. The first rocker arm ratio b2 / a1 is different from the second rocker arm ratio b1 / a1, that is, the distance between the driven end of the first rocker arm 7 and the rocker shaft is different from the distance between the driven end of the second rocker arm 8 and the rocker shaft.
[0041] Because the distance between the driven end of the first rocker arm 7 and the rocker shaft is different from the distance between the driven end of the second rocker arm 8 and the rocker shaft, the first valve 5 and the second valve 6 have an included angle in the direction perpendicular to the ridge line 4 of the roof structure 1. After the first rocker arm 7 and the second rocker arm 8 drive the first valve 5 and the second valve 6 to move synchronously, the movement distances of the first valve 5 and the second valve 6 are different, as shown in FIG. 2. With the rotation of the camshaft of the crankshaft, the profile heights of the first valve 5 and the second valve 6 are always different, and the lift of the first valve 5 is always greater than the lift of the second valve 6. Figure 4
[0042] In the intake stage, the first valve and the second valve are opened simultaneously, the lift of the first valve is always greater than the lift of the second valve, and the maximum lift of the first valve is greater than the maximum lift of the second valve. In the closing process, the first valve and the second valve are closed simultaneously, and the lift of the first valve is also always greater than the lift of the second valve. Finally, the first valve and the second valve are closed simultaneously.
[0043] The lift of the first valve 5 is always greater than the lift of the second valve 6, so that the opening degree of the first intake passage 2 is greater than the opening degree of the second intake passage 3, and the intake amount of the first intake passage 2 is greater than the intake amount of the second intake passage 3, so as to weaken the offsetting effect between the vortex components formed by the first intake passage 2 and the second intake passage 3, and generate a vortex in the cylinder.
[0044] After the first valve 5 and the second valve 6 are connected with the first rocker arm 7 and the second rocker arm 8 with different rocker arm ratios, the first valve 5 and the second valve 6 have an included angle in the direction perpendicular to the ridge line 4 of the roof structure 1. The included angle is determined by the rocker arm ratios of the first rocker arm 7 and the second rocker arm 8.
[0045] In some embodiments, the first rocker arm ratio b2 / a1 is greater than the second rocker arm ratio b1 / a1, and optionally, the first rocker arm ratio b2 / a1 < 1.7 and the second rocker arm ratio b1 / a1 > 1.2, i.e., the first rocker arm ratio b2 / a1 is at most 1.7 and the second rocker arm ratio b1 / a1 is at least 1.2.
[0046] In some embodiments, the first rocker arm 7 and the second rocker arm 8 are two separate rocker arms, i.e., the first rocker arm 7 has a driving end and a driven end, and the second rocker arm 8 has a driving end and a driven end, the driving end of the first rocker arm 7 is matched with the camshaft 12, the driving end of the second rocker arm 8 is also matched with the camshaft 12, the first rocker arm 7 and the second rocker arm 8 are connected with the same camshaft 12, the driven end of the first rocker arm 7 is connected with the first valve 5, and the driven end of the second rocker arm 8 is connected with the second valve 6, the first rocker arm 7 and the second rocker arm 8 are driven by the camshaft 12 to move synchronously, and the differential opening of the first valve 5 and the second valve 6 is realized.
[0047] In some embodiments, the first rocker arm 7 and the second rocker arm 8 share a driving end, and the first rocker arm 7 and the second rocker arm 8 have respective driven ends, as shown in FIG. 2, the first rocker arm 7 and the second rocker arm 8 are Y-shaped as a whole, and the two branches of the Y-shaped structure are the driven end of the first rocker arm 7 and the driven end of the second rocker arm 8, respectively. The camshaft 12 drives the common driving end of the first rocker arm 7 and the second rocker arm 8 to move, and drives the respective driven ends of the first rocker arm 7 and the second rocker arm 8 to move synchronously, and the differential opening of the first valve 5 and the second valve 6 is realized. Figure 3
[0048] In some embodiments, the center line 9 of the valve seat circle of the first valve 5 and the second valve 6 is parallel to the ridge line 4 of the roof structure 1, and the first valve 5 and the second valve 6 form an angle θ at the end away from the valve seat circle. This arrangement is more likely to achieve differential opening of the first valve 5 and the second valve 6, and is more likely to obtain a larger difference in movement height, and better forms a vortex in the cylinder.
[0049] In some embodiments, the angle between the first valve 5 and the second valve 6 in the direction perpendicular to the ridge line 4 of the roof structure 1 is 3°-8°.
[0050] The highest lift H1 of the first valve 5 and the highest lift H2 of the second valve 6 satisfy 0.5H1<H2<H1. In the case of differential opening of the first valve 5 and the second valve 6, a vortex is constructed on the basis of strong rolling flow, combustion in the cylinder is accelerated, and the emission and gas consumption of the engine are reduced.
[0051] The greater the difference in intake amount of the first valve 5 and the second valve 6, the more likely it is to construct a vortex.
[0052] In this scheme, the first valve 4 and the second valve 6 are opened and closed simultaneously, as shown in FIG. 1. Figure 4 The shown valve lift curve, the solid line, the dashed line type line respectively represents the first valve and the second valve in the intake stage of the valve working process. In the intake stage, the first valve and the second valve are opened simultaneously, in the valve opening process, the first valve lift is always greater than the second valve, and the maximum lift of the first valve is greater than the maximum lift of the second valve; in the valve closing process, the first valve lift is always greater than the second valve lift, and finally the two valves are closed simultaneously.
[0053] The first exhaust passage 10 and the second exhaust passage 11 located at the second side of the roof ridge line 4 of the roof structure 1 are symmetrically distributed.
[0054] The application also discloses an engine, comprising the engine cylinder head.
[0055] Since the engine cylinder head has the above technical effects, the engine with the engine cylinder head also has the same technical effects, which will not be repeated here.
[0056] The camshaft 12 driving the first rocker arm 7 and the second rocker arm 8 of the engine cylinder head is an overhead camshaft. The design of the overhead camshaft can shorten the distance between the camshaft 12 and the valve, simplify the transmission mechanism of the camshaft 12 to the valve, make the engine structure more compact, and improve the transmission efficiency.
[0057] The above description is only the preferred embodiment of the application and the explanation of the applied technical principles, and is not used to limit the application. For those skilled in the art, the application can have various changes and variations. The application range involved in the application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by the combination of the above technical features or equivalent features without departing from the above application concept. For example, the above features are replaced with the technical features disclosed in the application (but not limited to) having similar functions to form technical solutions.
Claims
1. An engine cylinder head, characterized in that, include: The engine cylinder head has a canopy structure (1) that surrounds the combustion chamber with the piston and cylinder of the engine. The first air intake (2) and the second air intake (3) are located on the first side of the roof ridge line (4) of the roof structure (1) and are symmetrically distributed. The first air intake (2) and the second air intake (3) are tumble air intakes. The first valve (5) and the second valve (6) are installed in the first intake manifold (2) and the second valve (6) is installed in the second intake manifold (3). The first rocker arm (7) and the second rocker arm (8) both rotate around the rocker arm shaft. The first rocker arm (7) and the second rocker arm (8) each have an active end and a passive end located on both sides of the rocker arm shaft. The active end of the first rocker arm (7) and the second rocker arm (8) cooperates with the camshaft (12). The passive end of the first rocker arm (7) and the second rocker arm (8) are respectively connected to the first valve (5) and the second valve (6). The first distance a1 between the active end of the first rocker arm (7) and the active end of the second rocker arm (8) and the rocker arm is equal. The ratio of the second distance b2 between the passive end of the first rocker arm (7) and the rocker arm shaft to the first distance a1 is the first rocker arm ratio b2 / a1 of the first rocker arm. The ratio of the third distance b1 between the passive end of the second rocker arm (8) and the rocker arm shaft to the first distance a1 is the second rocker arm ratio b1 / a1 of the second rocker arm. The first rocker arm ratio b2 / a1 is different from the second rocker arm ratio b1 / a1.
2. The engine cylinder head according to claim 1, characterized in that, The first rocker arm ratio b2 / a1 is greater than the second rocker arm ratio b1 / a1; And / or, the first rocker arm ratio b2 / a1 < 1.7, and the second rocker arm ratio b1 / a1 > 1.
2.
3. The engine cylinder head according to claim 1, characterized in that, The first rocker arm (7) and the second rocker arm (8) share the active end.
4. The engine cylinder head according to claim 1, characterized in that, The line (9) connecting the center of the valve seat rings of the first valve (5) and the second valve (6) is parallel to the roof ridge line (4), and the first valve (5) and the second valve (6) form an angle θ at the end away from the valve seat ring.
5. The engine cylinder head according to claim 4, characterized in that, The included angle θ satisfies that 3° < θ < 8°.
6. The engine cylinder head according to claim 1, characterized in that, The maximum lift H1 of the first valve (5) and the maximum lift H2 of the second valve (6) satisfy 0.5H1 <H2<H1。 7. The engine cylinder head according to claim 1, characterized in that, The first valve (5) and the second valve (6) open and close simultaneously.
8. The engine cylinder head according to claim 1, characterized in that, The first exhaust duct (10) and the second exhaust duct (11) located on the second side of the roof ridge line (4) of the roof structure (1) are symmetrically distributed.
9. An engine, characterized in that, Includes an engine cylinder head, wherein the engine cylinder head is the engine cylinder head according to any one of claims 1-8.
10. The engine according to claim 9, characterized in that, The camshaft (12) that drives the first rocker arm (7) and the second rocker arm (8) of the engine cylinder head is an overhead camshaft.