CN113818942B - Valve actuating mechanism of gasoline engine - Google Patents
Valve actuating mechanism of gasoline engine Download PDFInfo
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- CN113818942B CN113818942B CN202111064897.0A CN202111064897A CN113818942B CN 113818942 B CN113818942 B CN 113818942B CN 202111064897 A CN202111064897 A CN 202111064897A CN 113818942 B CN113818942 B CN 113818942B
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- air inlet
- exhaust
- rocker arm
- cylinder
- rod
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
The invention discloses a valve actuating mechanism of a gasoline engine, which comprises a cylinder, a valve rocker seat plate and a camshaft which are vertically arranged, wherein an air inlet cam and an air outlet cam are sleeved on the camshaft; the one end movable mounting of the rocking arm that admits air has the pole of admitting air that stretches into in the cylinder and with the cam linkage that admits air, and exhaust rocking arm one end movable mounting has the pole of exhausting that stretches into in the cylinder and with the cam linkage that exhausts, and this kind of structure has following two advantages: 1. the intake rocker arm and the exhaust rocker arm are both designed asymmetrically, and when the intake rocker arm and the exhaust rocker arm are matched with a large-inclination-angle valve layout, the risk of falling of a valve push rod after the valve inclination angle is increased in the conventional valve design mode is avoided. 2. Due to the isolation effect of the air inlet rocker arm and the exhaust rocker arm, the air inlet rocker arm seat and the exhaust rocker arm seat are in split type design, and the matching deformation caused by thermal expansion is greatly reduced.
Description
Technical Field
The invention relates to the technical field of gasoline engines, in particular to a valve actuating mechanism suitable for a large-inclination-angle valve of a general gasoline engine.
Background
With the development of general gasoline engines, the requirements on power, tail gas emission and the weight of the whole engine are higher and higher. The existing valve mechanism of the general gasoline engine is mostly of a non-inclination angle structure, the air intake efficiency is low, an air passage is almost vertical to an air valve, the air intake and exhaust efficiency is low, the resistance is large, the engine charging coefficient is low, the output power is low, the exhaust emission is not easy to control, and a small number of engines using the inclination angle valve are limited by the valve distribution structure of the whole engine, so that the inclination angle is small (smaller than 15 degrees), and the performance advantage cannot be exerted. Or the gas distribution structure is complex, the cost is too high, and the cost of the whole machine cannot be controlled within an acceptable range.
Therefore, the technical personnel in the field strive to develop a valve actuating mechanism which has a simple structure and is suitable for a large-inclination-angle valve of a general gasoline engine.
Disclosure of Invention
In view of the above-mentioned defects in the prior art, the present invention provides a valve actuating mechanism with a simple structure and suitable for a large-inclination-angle valve of a general gasoline engine.
In order to achieve the purpose, the invention provides a valve actuating mechanism of a gasoline engine, which comprises a vertically arranged cylinder, a valve rocker arm seat plate which is positioned above the cylinder and horizontally unfolded, and a cam shaft positioned below the cylinder, wherein an air inlet cam and an air outlet cam are sleeved on the cam shaft, an air inlet rocker arm seat and an air outlet rocker arm seat which are symmetrically arranged in a V shape are integrally arranged on the valve rocker arm seat plate, and the air inlet rocker arm seat and the air outlet rocker arm seat are respectively hinged with an air inlet rocker arm and an air outlet rocker arm; one end movable mounting of the air inlet rocker arm is provided with an air inlet rod which stretches into the cylinder and is linked with the air inlet cam, and one end movable mounting of the exhaust rocker arm is provided with an exhaust rod which stretches into the cylinder and is linked with the exhaust cam.
The air inlet rocker arm seat and the air exhaust rocker arm seat are both in a shape of a table from inside to outside and from thick to thin; the axial middle part of the air inlet rocker arm is obliquely arranged at the axial middle part of the air inlet rocker arm seat, and an air inlet hinge hole with an axis forming an acute angle with the horizontal plane is axially arranged on the air inlet rocker arm seat; the axial middle part of the exhaust rocker arm is obliquely arranged at the axial middle part of the exhaust rocker arm, and an exhaust hinge hole with an acute angle formed between the axis and the horizontal plane is axially arranged on the exhaust rocker arm seat.
The other end of the air inlet rocker arm is provided with an air inlet driving deflection head which is movably connected with the top end of an air inlet driving rod, and the air inlet driving deflection head deflects 15-20 degrees in the vertical direction.
The other end of the exhaust rocker arm is provided with an exhaust driving deflection head which is movably connected with the top end of an exhaust driving rod, and the exhaust driving deflection head deflects 15-20 degrees in the vertical direction.
The included angle between the axis of the exhaust hinge hole and the horizontal plane is 15-25 degrees, and the included angle between the axis of the air inlet hinge hole and the horizontal plane is 15-25 degrees.
The included angle between the air inlet rod and the axis of the air cylinder is 15-25 degrees; the included angle between the exhaust rod and the axis of the cylinder is 15-25 degrees.
The included angle between the axis of the air inlet hinge hole and the horizontal plane is 18 degrees, the deflection angle of the air inlet driving deflection head in the vertical direction is 18 degrees, and the included angle between the air inlet rod and the axis of the air cylinder is 18 degrees.
The included angle between the exhaust hinge hole and the horizontal plane is 18 degrees, the deflection angle of the exhaust driving deflection head in the vertical direction is 18 degrees, and the included angle between the exhaust rod and the axis of the cylinder is 18 degrees.
The top of the cylinder is further provided with an air inlet channel and an air outlet channel, the air inlet channel is located on one side of the air inlet rod, and the air outlet channel is located on one side of the air exhaust rod.
The bottom end of the air inlet driving rod is movably connected with an air inlet tappet, the bottom of the air inlet tappet is in abutting connection with the air inlet cam, the bottom end of the exhaust driving rod is movably connected with an exhaust tappet, and the bottom of the exhaust tappet is in abutting connection with the exhaust cam.
The air inlet driving deflection head, the exhaust driving deflection head, the top end of the air inlet tappet and the top end of the exhaust tappet are all hemispherical, and the air inlet driving deflection head, the exhaust driving deflection head, the top end of the air inlet tappet and the top end of the exhaust tappet are all in a coated hemispherical bowl shape.
The invention has the beneficial effects that: the invention relates to a gas distribution mechanism of a gasoline engine, which comprises a cylinder, a valve rocker arm seat plate and a camshaft which are vertically arranged, wherein an air inlet cam and an air outlet cam are sleeved on the camshaft; one end movable mounting of the air inlet rocker arm has an air inlet rod which stretches into the cylinder and is linked with the air inlet cam, one end movable mounting of the exhaust rocker arm has an exhaust rod which stretches into the cylinder and is linked with the exhaust cam, and in the structure, the two advantages are as follows:
1. the intake rocker arm and the exhaust rocker arm are both designed asymmetrically, so that the risk of falling of the valve push rod after the valve inclination angle is increased in the conventional valve design mode is completely avoided while the layout of the valve with the large inclination angle is adapted.
2. Due to the isolation effect of the air inlet rocker arm and the exhaust rocker arm, the air inlet rocker arm seat and the exhaust rocker arm seat are in split type design, and the matching deformation caused by thermal expansion is greatly reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a side elevational view of the intake rocker arm of the present invention;
FIG. 3 is a right side elevational view of the construction of the intake rocker arm of the present invention;
FIG. 4 is a top plan view of the valve rocker seat plate of the present invention;
FIG. 5 isbase:Sub>A cross-sectional view taken at A-A in FIG. 4;
FIG. 6 is a schematic view of the intake drive rod of the present invention;
FIG. 7 is a bottom view of a portion of the present invention;
fig. 8 is a sectional view taken at B-B in fig. 7.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, wherein the terms "upper", "lower", "left", "right", "inner", "outer", and the like are used in the description of the invention to indicate orientations and positional relationships based on those shown in the drawings, and are used for convenience in describing the invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular manner, and therefore should not be construed as limiting the invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1 to 8, a valve actuating mechanism of a gasoline engine comprises a vertically arranged cylinder 10, a valve rocker arm seat plate 20 which is positioned above the cylinder 10 and horizontally unfolded, and a camshaft 50 which is positioned below the cylinder 10, wherein an intake cam 51 and an exhaust cam 52 are sleeved on the camshaft 50, an intake rocker arm seat 30 and an exhaust rocker arm seat 40 which are symmetrically arranged in a V shape are integrally arranged on the valve rocker arm seat plate 20, and an intake rocker arm 31 and an exhaust rocker arm 41 are respectively hinged on the intake rocker arm seat 30 and the exhaust rocker arm seat 40; one end of the intake rocker arm 31 is movably provided with an intake rod 32 which extends into the cylinder 10 and is linked with the intake cam 51, and one end of the exhaust rocker arm 41 is movably provided with an exhaust rod 42 which extends into the cylinder 10 and is linked with the exhaust cam 52.
The bottom end of the air inlet driving rod 34 is movably connected with an air inlet tappet 37, the bottom of the air inlet tappet 37 is in abutting connection with the air inlet cam 51, the bottom end of the exhaust driving rod 44 is movably connected with an exhaust tappet 47, and the bottom of the exhaust tappet 47 is in abutting connection with the exhaust cam 52. Furthermore, both ends of the top and the bottom of the intake driving rod 34 and both ends of the top and the bottom of the exhaust driving rod 44 are hemispherical, and the intake driving deflection head 33, the exhaust driving deflection head 43, the top end of the intake tappet 37 and the top end of the exhaust tappet 47 are all wrapped in a hemispherical bowl shape, so that the upper end and the lower end of the intake driving rod 34 and the upper end and the lower end of the exhaust driving rod 44 are in ball joint, can rotate with a large degree of freedom, and not only move up and down along the cylinder 10.
In the present embodiment, the intake rocker arm seat 30 and the exhaust rocker arm seat 40 are both in a truncated cone shape from inside to outside and from thick to thin; the axial middle part of the intake rocker arm 31 is obliquely arranged at the axial middle part of the intake rocker arm seat 30, and the intake rocker arm seat 30 is axially provided with an intake hinging hole 35 of which the axis forms an acute angle with the horizontal plane; the axial middle part of the exhaust rocker arm 41 is obliquely arranged at the axial middle part of the exhaust rocker arm 41, and the exhaust rocker arm seat 40 is axially provided with an exhaust hinge hole 45 of which the axis forms an acute angle with the horizontal plane.
The top of the cylinder 10 is further provided with an air inlet 11 and an air outlet 12, the air inlet 11 is located at one side of the air inlet rod 32, and the air outlet 12 is located at one side of the air outlet rod 42.
The other end of the air inlet rocker arm 31 is provided with an air inlet driving deflection head 33 and is movably connected with the top end of an air inlet driving rod 34, as shown in fig. 2 and 3, the air inlet driving deflection head 33 is deflected by an angle a in the vertical direction, and the air inlet driving deflection head 33 deflects by 15-20 degrees in the vertical direction; since the intake assembly and the exhaust assembly of the valve train are symmetrically arranged in this embodiment, but the structures of the intake assembly and the exhaust assembly are the same, similarly, the other end of the exhaust rocker arm 41 is provided with an exhaust driving deflection head 43 and is movably connected with the top end of an exhaust driving rod 44, and the exhaust driving deflection head 43 deflects 15 to 20 degrees in the vertical direction.
As shown in fig. 4 and 5, an included angle between the axis of the exhaust hinge hole 45 and the horizontal plane is b, an included angle between the axis of the exhaust hinge hole 45 and the horizontal plane is 15 to 25 °, and similarly, an included angle between the axis of the intake hinge hole 35 and the horizontal plane is 15 to 25 °; as shown in fig. 7 and 8, an included angle between the air intake rod 32 and the axis of the air cylinder 10 is set to be c, and an included angle between the air intake rod 32 and the axis of the air cylinder 10 is 15-25 °; an included angle d is set between the exhaust rod 42 and the axis of the cylinder 10, and the included angle d between the exhaust rod 42 and the axis of the cylinder 10 is 15-25 degrees.
Preferably, experiments show that the whole valve actuating mechanism operates more efficiently in the angular range below the value. The included angle between the axis of the air inlet hinge hole 35 and the horizontal plane is 18 degrees, the deflection angle of the air inlet driving deflection head 33 in the vertical direction is 18 degrees, and the included angle between the air inlet rod 32 and the axis of the air cylinder 10 is 18 degrees; the included angle between the exhaust hinge hole 45 and the horizontal plane is 18 degrees, the deflection angle of the exhaust driving deflection head 43 in the vertical direction is 18 degrees, and the included angle between the exhaust rod 42 and the axis of the cylinder 10 is 18 degrees.
The working principle of the invention is as follows:
after the engine is started, the camshaft 50 operates to push the exhaust tappet 47 to do linear reciprocating motion along the axis direction of the cylinder, the exhaust tappet 47 pushes the exhaust driving rod 44 to move, the exhaust driving rod 44 pushes the exhaust rocker arm 41 mounted on the exhaust rocker arm seat 40 to do reciprocating rotation motion, and then the exhaust rod 42 is pushed to open/close the exhaust passage 12, that is, through the matching of the composite included angle on the exhaust rocker arm seat 40 and the composite included angle on the exhaust rocker arm 41, the reciprocating rotation motion on the exhaust rocker arm 41 is converted into the reciprocating linear motion on the exhaust rod 42 which forms a certain included angle (15-25 degrees) with the axis of the cylinder, and the exhaust working cycle is formed.
After the exhaust valve working cycle is finished, the camshaft 50 runs to push the air inlet tappet 37 to do linear reciprocating motion along the axis direction of the cylinder, the air inlet tappet 37 pushes the air inlet driving rod 34 to move, the air inlet driving rod 34 pushes the air inlet rocker arm 31 installed on the air inlet rocker arm seat 30 to do reciprocating rotary motion, and then the air inlet rod 32 is pushed to open/close the air inlet channel 11, namely, the reciprocating rotary motion on the air inlet rocker arm 31 is converted into reciprocating linear motion on the air inlet rod 42, which forms a certain included angle (15-25 degrees) with the axis of the cylinder, through the matching of the composite included angle on the air inlet rocker arm seat 30 and the composite included angle on the air inlet rocker arm 31, and the air inlet working cycle is finished.
Due to the brand-new asymmetric design of the intake rocker arm 31 and the exhaust rocker arm 41, the risk of falling off of a valve push rod after increasing the valve inclination angle in the conventional valve design mode is completely avoided while the layout of the valve with the large inclination angle is adapted; the deflection angles of the air inlet rod 32 and the air exhaust rod 42 are very small (< 0.8 degrees) in the moving process, and the linear reciprocating motion of the rocker arm push rod end is converted into the reciprocating motion of a valve end which forms a large included angle (20-25 degrees) with the axis of the cylinder. By matching with the design of a high-charging air passage, higher charging efficiency can be obtained, the power of the engine is effectively improved under the condition of controllable cost, the combustion effect is improved, and the exhaust emission is reduced.
In addition, due to the isolation effect of the air inlet rocker arm and the air exhaust rocker arm, the air inlet rocker arm seat and the air exhaust rocker arm seat are in split type design, and the matching deformation caused by thermal expansion is greatly reduced.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the above teachings. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (6)
1. A valve actuating mechanism of a gasoline engine comprises a vertically arranged cylinder (10), a valve rocker arm seat plate (20) which is positioned above the cylinder (10) and horizontally unfolded, and a cam shaft (50) which is positioned below the cylinder (10), wherein an air inlet cam (51) and an exhaust cam (52) are sleeved on the cam shaft (50), an air inlet rocker arm seat (30) and an exhaust rocker arm seat (40) which are symmetrically arranged in a V shape are integrally arranged on the valve rocker arm seat plate (20), and an air inlet rocker arm (31) and an exhaust rocker arm (41) are respectively hinged on the air inlet rocker arm seat (30) and the exhaust rocker arm seat (40); an air inlet rod (32) extending into the cylinder (10) and linked with the air inlet cam (51) is movably mounted at one end of the air inlet rocker arm (31), and an exhaust rod (42) extending into the cylinder (10) and linked with the exhaust cam (52) is movably mounted at one end of the exhaust rocker arm (41);
the method is characterized in that: the air inlet rocker arm seat (30) and the exhaust rocker arm seat (40) are both in a platform shape from inside to outside and from thick to thin; the axial middle part of the air inlet rocker arm (31) is obliquely arranged at the axial middle part of the air inlet rocker arm seat (30), and an air inlet hinge hole (35) with an axis forming an acute angle with the horizontal plane is axially arranged on the air inlet rocker arm seat (30); the axial middle part of the exhaust rocker arm (41) is obliquely arranged at the axial middle part of the exhaust rocker arm (41), and an exhaust hinge hole (45) with an axis forming an acute angle with the horizontal plane is axially arranged on the exhaust rocker arm seat (40);
the other end of the air inlet rocker arm (31) is provided with an air inlet driving deflection head (33) which is movably connected with the top end of an air inlet driving rod (34), and the air inlet driving deflection head (33) deflects for 15-20 degrees in the vertical direction;
the other end of the exhaust rocker arm (41) is provided with an exhaust driving deflection head (43) and is movably connected with the top end of an exhaust driving rod (44), and the exhaust driving deflection head (43) deflects for 15-20 degrees in the vertical direction;
the bottom end of the air inlet driving rod (34) is movably connected with an air inlet tappet (37), the bottom of the air inlet tappet (37) is in abutting connection with the air inlet cam (51), the bottom end of the exhaust driving rod (44) is movably connected with an exhaust tappet (47), and the bottom of the exhaust tappet (47) is in abutting connection with the exhaust cam (52);
the top and bottom ends of the air inlet driving rod (34) and the top and bottom ends of the exhaust driving rod (44) are hemispherical, and the air inlet driving deflection head (33), the exhaust driving deflection head (43), the top end of the air inlet tappet (37) and the top end of the exhaust tappet (47) are all in a coated hemispherical bowl shape.
2. The valve train of a gasoline engine according to claim 1, wherein: the included angle between the axis of the exhaust hinge hole (45) and the horizontal plane is 15-25 degrees, and the included angle between the axis of the air inlet hinge hole (35) and the horizontal plane is 15-25 degrees.
3. The valve train of a gasoline engine according to claim 1 or 2, characterized in that: the included angle between the air inlet rod (32) and the axis of the air cylinder (10) is 15-25 degrees; the included angle between the exhaust rod (42) and the axis of the cylinder (10) is 15-25 degrees.
4. The valve train of a gasoline engine according to claim 3, wherein: the included angle between the axis of the air inlet hinge hole (35) and the horizontal plane is 18 degrees, the deflection angle of the air inlet driving deflection head (33) in the vertical direction is 18 degrees, and the included angle between the air inlet rod (32) and the axis of the air cylinder (10) is 18 degrees.
5. The valve train of a gasoline engine according to claim 3, wherein: the included angle between the exhaust hinge hole (45) and the horizontal plane is 18 degrees, the deflection angle of the exhaust driving deflection head (43) in the vertical direction is 18 degrees, and the included angle between the exhaust rod (42) and the axis of the cylinder (10) is 18 degrees.
6. The valve train of a gasoline engine according to claim 1, wherein: the top of the cylinder (10) is further provided with an air inlet channel (11) and an air outlet channel (12), the air inlet channel (11) is located on one side of the air inlet rod (32), and the air outlet channel (12) is located on one side of the air outlet rod (42).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111064897.0A CN113818942B (en) | 2021-09-11 | 2021-09-11 | Valve actuating mechanism of gasoline engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111064897.0A CN113818942B (en) | 2021-09-11 | 2021-09-11 | Valve actuating mechanism of gasoline engine |
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| CN113818942A CN113818942A (en) | 2021-12-21 |
| CN113818942B true CN113818942B (en) | 2022-10-04 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6009849A (en) * | 1996-08-12 | 2000-01-04 | Mazda Motor Corporation | Direct fuel injection engine |
| CN102305148A (en) * | 2011-03-14 | 2012-01-04 | 隆鑫通用动力股份有限公司 | General gasoline engine cylinder head and gasoline engine |
| CN102305126A (en) * | 2011-03-14 | 2012-01-04 | 隆鑫通用动力股份有限公司 | Gasoline engine and inclined air valve cylinder head for same |
| CN203783667U (en) * | 2014-01-22 | 2014-08-20 | 广州汽车集团股份有限公司 | Engine valve mechanism and engine |
| CN104832237A (en) * | 2015-05-07 | 2015-08-12 | 苏州市双马机电有限公司 | Valve rocker mounting mechanism and gasoline engine thereof |
| CN210799060U (en) * | 2019-09-11 | 2020-06-19 | 浙江康思特动力机械有限公司 | Valve actuating mechanism of V-shaped double-cylinder universal gasoline engine |
-
2021
- 2021-09-11 CN CN202111064897.0A patent/CN113818942B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6009849A (en) * | 1996-08-12 | 2000-01-04 | Mazda Motor Corporation | Direct fuel injection engine |
| CN102305148A (en) * | 2011-03-14 | 2012-01-04 | 隆鑫通用动力股份有限公司 | General gasoline engine cylinder head and gasoline engine |
| CN102305126A (en) * | 2011-03-14 | 2012-01-04 | 隆鑫通用动力股份有限公司 | Gasoline engine and inclined air valve cylinder head for same |
| CN203783667U (en) * | 2014-01-22 | 2014-08-20 | 广州汽车集团股份有限公司 | Engine valve mechanism and engine |
| CN104832237A (en) * | 2015-05-07 | 2015-08-12 | 苏州市双马机电有限公司 | Valve rocker mounting mechanism and gasoline engine thereof |
| CN210799060U (en) * | 2019-09-11 | 2020-06-19 | 浙江康思特动力机械有限公司 | Valve actuating mechanism of V-shaped double-cylinder universal gasoline engine |
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| CN113818942A (en) | 2021-12-21 |
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