CN101235760A - Four stroke OHC structure engine - Google Patents
Four stroke OHC structure engine Download PDFInfo
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- CN101235760A CN101235760A CNA2008100185680A CN200810018568A CN101235760A CN 101235760 A CN101235760 A CN 101235760A CN A2008100185680 A CNA2008100185680 A CN A2008100185680A CN 200810018568 A CN200810018568 A CN 200810018568A CN 101235760 A CN101235760 A CN 101235760A
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Abstract
The invention discloses a four-stroke OHC structure engine, which comprises a cylinder cover, a casing and a crankcase cover, wherein the cylinder cover is arranged on the upper side of the casing, the cylinder and the casing are integrated, the crankshaft assembly is arranged in the casing via the block bearing, the piston in the cylinder is connected with the crankshaft assembly via the connecting rod assembly, the cylinder cover, the casing and the crankcase cover are detachable structure, the connection face of the cylinder cover and the casing is the first faying face, the connection face of the crankcase cover and the casing is the second faying face, the first faying face is parallel to the central line of the crankshaft, the second faying face is vertical with the central line of the crankshaft. The cylinder cover, the casing and the crankcase cover are detachable structure, so low cost processing of the complicate structure casing and the cylinder cover is easy to achieve.
Description
Technical field
The present invention relates to a kind of four stroke OHC structure engine.
Background technique
At present, in the general four stroke OHC structure engine, cylinder head, it is the heat radiation that helps casing like this that casing is made into overall structure, but be unfavorable for manufacturing, as State Intellectual Property Office's disclosed application number on April 11st, 2007 is " 200610097165.0 ", name is called the patent of invention of " four stroke top placed cam-type engine ", its body is by cylinder head, cylinder barrel, last bent axle half chests, chain chamber is connected to form one, because the all-in-one-piece structure of this kind is in course of working, cutter must process to air valve seat ring and valve guide bushing by cylinder, and make the cylinder honing become blind-hole type, the cylinder hole generally is difficult to processing like this, cutter is made also complicated unusually, and the casing reject rate that this kind method processes also can be very high.Certainly in order to overcome such difficulty, make easy to process, also have cylinder head, casing, the OHC structure engine of split type manufacturing, yet the shortcoming of this class motor is the junction plane of cylinder head and casing have been increased thickness and causes the heat radiation of cylinder head unfavorable, this kind motor often becomes the inclined-plane with casing with the parting Surface Design of crankcase cover or is designed to through the horizontal plane on the crankshaft axis simultaneously, all is unfavorable for processing.Inclined-plane mold joint is for example assigned and is processed and assembling has brought inconvenience because casing and crankcase cover all are the inclined-plane; And for through the horizontal parting face of crankshaft axis, then certainly will the crankshaft bearing hole will be processed in two, all bring suitable difficulty for Mold Making, production and processing and be unfavorable for the sealing of casing.Also have present as in the distribution device on the above-mentioned four stroke OHC structure engine cylinder head, two pitman arm shafts of normal employing, and the intake valve of its cylinder head and exhaust valve often adopt the structural type that is arranged in parallel, and make valve and air flue approximate vertical to be unfavorable for the air inlet and the exhaust of motor.As U.S. Patent number is a kind of new overhead camshaft type engine that proposes in the patent of US 5706769, the cam follower of its control intake valve and exhaust valve is arranged on the opposite both sides of the single valve door operation cam in the cylinder head, intake valve and exhaust valve are arranged in parallel, and vertical with bent axle, air inlet and exhaust cam driven member form two minutes structure.An arm of air inlet and exhaust cam driven member extends internally mutually, touch the intake ﹠ exhaust valves door respectively, another arm also extends internally mutually, touch a camming surface of the valve operation cam below the single valve door operation cam rotating center, it is the both sides that rocking arm are arranged in camshaft, adopts two pitman arm shafts of a camshaft, thereby has increased part number, structure assembling herein is inconvenient, has also increased the making man-hour of casing.And the to-and-fro motion scope of two pitman arm shafts increases, and has directly influenced the heat radiation of cylinder head, has influenced the heat radiation of exhaust valve seat and contacting point, firing chamber especially.
Summary of the invention
The objective of the invention is: provide a kind of cylinder head, casing and crankcase cover three to be split-type structural, the four stroke OHC structure engine of great convenient manufacturing, and can improve the heat radiation of cylinder head simultaneously, overcome many deficiencies of the existing four stroke OHC structure engine of mentioning in the background technique.
Technological scheme of the present invention is: a kind of four stroke OHC structure engine, comprise cylinder head, casing and crankcase cover, cylinder head is positioned at the top of casing, cylinder and casing form one, crank assemblby is installed in the casing by the bearing supporting, and the piston in the cylinder connects crank assemblby by connecting rod ASSY; Described cylinder head, casing and crankcase cover three are split-type structural, and the junction surface between cylinder head and casing is first junction plane, and the junction surface between crankcase cover and casing is second junction plane, described first junction plane and crankshaft center line parallel; And second junction plane is vertical with crankshaft axis.
More detailed structural relation is further perpendicular between first junction plane described in the present invention and second junction plane, therefore first junction plane with the crankshaft center line parallel in also be horizontal arrangement, overcome cylinder head with this and be in tilted layout with the casing junction surface and may give processing and assemble the inconvenience of bringing.
Further be provided with the intake duct and the air outlet flue of lateral arrangement described in the present invention on the cylinder head, intake duct and air outlet flue lay respectively at the both sides of cylinder-bore axis; Because casing and cylinder head junction plane thickness increase, may cause the cylinder head heat radiation unfavorable, in order to solve this contradiction, when the present invention is arranged on the cylinder-bore axis both sides with the intake valve on the cylinder and exhaust valve, they are in tilted layout mutually, and become constant slope with intake duct with air outlet flue respectively.Adopting a pitman arm shaft to intersect inlet valve rocker in the valve control mechanism and exhaust valve rocker arm simultaneously is inserted on the cylinder head, because intake valve becomes gradient to arrange with exhaust valve, so pitman arm shaft is easy to be arranged in the neutral position of intake valve and exhaust valve, and the top and bottom of each valve rocker lay respectively at the both sides of pitman arm shaft center line.And the camshaft pin joint is on cylinder head, and is positioned at the below of pitman arm shaft.
The upper end of inlet valve rocker is connected with the root of intake valve among the present invention, and the Cam set assembly on the lower end is made circular arc and is arranged on camshaft contacts; The upper end of exhaust valve rocker arm is connected with the root of exhaust valve, the lower end make circular arc also be arranged on camshaft on Cam set assembly contact; And sprocket wheel is housed on the crank assemblby, connect Cam set assembly through chain transmission.And the further position of pitman arm shaft center line, camshaft center line and crankshaft axis three relation is parallel to each other.
Advantage of the present invention is:
1. the present invention adopts cylinder head, casing and crankcase cover three split-type structural, is convenient to the casing of implementation structure complexity and the low cost processing of cylinder head.
2. the present invention is designed to the structural type of tilt distribution in the cylinder-bore axis both sides with intake valve and exhaust valve, adopting single pitman arm shaft to intersect inlet valve rocker and exhaust valve rocker arm simultaneously is contained on the cylinder head, make the rocking arm size compact more, the heat radiation that these all are more conducive to cylinder head has solved because of casing and cylinder head junction plane thickness increase and has caused the cylinder head disadvantageous contradiction of dispelling the heat; And also make the present invention be very easy to assembling and maintenance, improved the reliability of complete machine.
Description of drawings
Below in conjunction with drawings and Examples the present invention is further described:
Fig. 1 is the plan view of the specific embodiment of the invention;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the B-B sectional view of Fig. 1;
Fig. 4 is Fig. 1 embodiment's STRUCTURE DECOMPOSITION figure;
Fig. 5 is the independent perspective view of the valve control mechanism among Fig. 1 embodiment;
Fig. 6 is the independent plan view of the valve operating mechanism among Fig. 1 embodiment.
Wherein: 1, crank assemblby; 2, connecting rod ASSY; 3, piston; 4, cylinder head; 5, exhaust valve; 6, valve spring; 7, cotter seat; 8, exhaust valve rocker arm; 9, valve lash adjusting screw; 10, locking nut; 11, pitman arm shaft; 12, inlet valve rocker; 13, intake valve; 14, casing; 15, Cam set assembly; 16, camshaft; 17, crankcase cover; 18, cylinder head gasket; 19, case lid sealing gasket; 20, cylinder head cover; 21, chain; 22, drive sprocket; 23, cylinder; 24, first junction plane; 25, second junction plane; 26, intake duct; 27, air outlet flue; A1-A1, crankshaft axis; B1-B1, cylinder-bore axis; C1-C1, pitman arm shaft center line; D1-D1, camshaft center line.
Embodiment
Embodiment: in conjunction with Fig. 1, Fig. 2, Fig. 3 with Figure 4 shows that the overall structure schematic representation of a kind of embodiment of four stroke OHC structure engine of the present invention, it is mainly by crank assemblby 1; Connecting rod ASSY 2; Piston 3; Cylinder head 4; Exhaust valve 5; Valve spring 6; Cotter seat 7; Exhaust valve rocker arm 8; Valve lash adjusting screw 9; Locking nut 10; Pitman arm shaft 11; Inlet valve rocker 12; Intake valve 13; Casing 14; Cam set assembly 15; Camshaft 16; Crankcase cover 17; Cylinder head gasket 18; Case lid sealing gasket 19; Cylinder head cover 20; Chain 21; Drive sprocket 22; Cylinder 23; First junction plane 24; Second junction plane 25; Intake duct 26; Air outlet flue 27 these workpiece constitute.
As Fig. 2, Fig. 3 and shown in Figure 4, cylinder 23 is one-body molded in casing 14 in the present embodiment, and crank assemblby 1 is installed in the casing 14 by the bearing supporting, and the piston 3 in the cylinder 23 connects crank assemblby 1 by connecting rod ASSY 2.Cylinder head 4, casing 14 and crankcase cover 17 threes are split-type structural, and cylinder head 4 is positioned at the top of casing 14, and are connected on the casing 14 through cylinder head gasket 18 bolts; And crankcase cover 17 is positioned at a side of casing 14, is connected on the casing 14 through case lid sealing gasket 19 bolts.The junction surface that cylinder head 4 and casing are 14 is first junction plane 24, and the junction surface that crankcase cover 17 and casing are 14 is second junction plane 25, and described first junction plane 24 is parallel with crankshaft axis A1-A1; And second junction plane 25 is vertical with crankshaft axis A1-A1; First junction plane 24 is also vertical with second junction plane 25 simultaneously.
Be fixed with cylinder head cover 20 in the present embodiment on the cylinder head 4, be cast with the intake duct 26 and the air outlet flue 27 of lateral arrangement on the cylinder head 4 in advance, intake duct 26 and air outlet flue 27 lay respectively at the both sides of cylinder-bore axis B1-B1.One end of described intake duct 26 leads to cylinder 23, and intake valve 13 is equipped with in connection place; And an end of air outlet flue 15 also leads to cylinder 23, and exhaust valve 5 is equipped with in connection place; With on the same intake valve 13 of prior art a cotter seat 7 being housed, and through this cotter seat 7 coaxial valve spring 6 that is nested with on intake valve; And the installation of the spring on the exhaust valve 5 is identical with intake valve 13.Intake valve 13 in the present embodiment on the cylinder 23 and exhaust valve 5 are positioned at the both sides of cylinder-bore axis B1-B1, be in tilted layout mutually, and respectively with 27 one-tenth constant slopes of intake duct 26 and air outlet flue.
Further combined with Fig. 5, Figure 6 shows that the valve control mechanism structural representation in the present embodiment, inlet valve rocker 12 and exhaust valve rocker arm 8 adopts a pitman arm shaft 11 to intersect to be inserted on the cylinder head 4 in the present embodiment; Because intake valve 13 and exhaust valve 5 are in tilted layout, pitman arm shaft 11 is arranged in the neutral position of two valves very easily; One end of while pitman arm shaft 11 is made outstanding, is used to cylinder head cover 20 contact preventing slippages.Be connected with camshaft 16 on the cylinder head 4 simultaneously, camshaft 16 is arranged between intake valve 13 and the exhaust valve 5, and is positioned at the below of pitman arm shaft 11, and camshaft center line D1-D1 is parallel with pitman arm shaft center line C1-C1, and Cam set assembly 15 is housed on camshaft 16.Drive sprocket 22 is housed, and through chain 21 Cam set assembly 15 that is in transmission connection on the crank assemblby 1, so Cam set assembly 15 is by crank assemblby 1 driven rotary, and crankshaft axis A1-A1 is parallel with camshaft center line D1-D1.Described inlet valve rocker 12 the upper end be connected and fixed by valve lash adjusting screw 9 and locking nut 10 and intake valve 13 roots, the lower end is made circular arc and is contacted with Cam set assembly 15, and the top and bottom of inlet valve rocker 12 lay respectively at the both sides of pitman arm shaft center line C1-C1; Equally, the upper end of exhaust valve rocker arm 8 also is connected and fixed with exhaust valve 5 roots by valve lash adjusting screw 9 and locking nut 10, the lower end is in the arc-shaped to contact with Cam set assembly 15, and the top and bottom of exhaust valve rocker arm 8 lay respectively at the both sides of pitman arm shaft center line (C1-C1).
The working procedure of the above-mentioned valve control mechanism in the present embodiment is as follows: crank assemblby 1 drives camshaft 16 rotations by drive sprocket 22 and chain 21, thereby make the Cam set assembly 15 that is installed on the camshaft 16 promote the inlet valve rocker 12 of contact with it and the lower end of exhaust valve rocker arm 8, make the upper end of inlet valve rocker 12 and the upper end swing of exhaust valve rocker arm 8, overcome the resistance of valve spring, intake valve 13 or exhaust valve 5 are opened in circulation.When Cam set assembly 15 rotates to upper end to inlet valve rocker 12 and exhaust valve rocker arm 8 when not having pressure, intake valve 13 and exhaust valve 5 rely on the elastic force of valve spring to close, and finish resetting of inlet valve rocker 12 and exhaust valve rocker arm 8.
Present embodiment adopts cylinder head 4, casing 14 and crankcase cover 17 three's split-type structurals, is convenient to the casing 14 of implementation structure complexity and the low cost processing of cylinder head 4.Again intake valve 13 and exhaust valve 5 are designed to the structural type of tilt distribution in cylinder-bore axis B1-B1 both sides in the present embodiment simultaneously, adopting single pitman arm shaft 11 to intersect with exhaust valve rocker arm 8 inlet valve rocker 12 simultaneously is contained on the cylinder head 4, make the rocking arm size compact more, the heat radiation that these all are more conducive to cylinder head has solved because of casing 14 and cylinder head 4 junction plane thickness increase and has caused the cylinder head disadvantageous contradiction of dispelling the heat; And also make the present invention be very easy to assembling and maintenance, improved the reliability of complete machine.
Claims (7)
1. four stroke OHC structure engine, comprise cylinder head (4), casing (14) and crankcase cover (17), cylinder head (4) is positioned at the top of casing (14), cylinder (23) forms one with casing (14), crank assemblby (1) is installed in the casing (14) by the bearing supporting, and the piston (3) in the cylinder (23) connects crank assemblby (1) by connecting rod ASSY (2); It is characterized in that described cylinder head (4), casing (14) and crankcase cover (17) three are split-type structural, junction surface between cylinder head (4) and casing (14) is first junction plane (24), junction surface between crankcase cover (17) and casing (14) is second junction plane (25), and described first junction plane (24) is parallel with crankshaft axis (A1-A1); And second junction plane (25) is vertical with crankshaft axis (A1-A1).
2. four stroke OHC structure engine according to claim 1 is characterized in that described first junction plane (24) is vertical with second junction plane (25).
3. four stroke OHC structure engine according to claim 1 and 2, it is characterized in that described cylinder head (4) is provided with the intake duct (26) and the air outlet flue (27) of lateral arrangement, intake duct (26) and air outlet flue (27) lay respectively at the both sides of cylinder-bore axis (B1-B1); And intake valve (13) on the cylinder (23) and exhaust valve (5) also are positioned at the both sides of cylinder-bore axis (B1-B1), are in tilted layout mutually, and become constant slope with intake duct (26) with air outlet flue (27) respectively.
4. four stroke OHC structure engine according to claim 3, it is characterized in that inlet valve rocker (12) and exhaust valve rocker arm (8) adopt a pitman arm shaft (11) to intersect and be inserted on the cylinder head (4), and the top and bottom of each valve rocker lay respectively at the both sides of pitman arm shaft center line (C1-C1); Camshaft (16) pin joint is gone up and is arranged between intake valve (13) and the exhaust valve (5) in cylinder head (3) simultaneously, and is positioned at the below of pitman arm shaft (11).
5. four stroke OHC structure engine according to claim 4 is characterized in that the upper end of inlet valve rocker (12) is connected with the root of intake valve (13), and the Cam set assembly (15) on the lower end is made circular arc and is arranged on camshaft (16) contacts; The upper end of exhaust valve rocker arm (8) is connected with the root of exhaust valve (5), the lower end make circular arc also be arranged on camshaft (16) on Cam set assembly (15) contact; And drive sprocket (22) is housed on the crank assemblby (1), through chain (21) Cam set assembly (15) that is in transmission connection.
6. four stroke OHC structure engine according to claim 5 is characterized in that described pitman arm shaft center line (C1-C1), camshaft center line (D1-D1) and crankshaft axis (A1-A1) three are parallel to each other.
7. four stroke OHC structure engine according to claim 1 is characterized in that described cylinder head (4) is connected on the casing (14) through cylinder head gasket (18) bolt; And crankcase cover (17) is connected on the casing (14) through case lid sealing gasket (19) bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100185680A CN101235760A (en) | 2008-02-26 | 2008-02-26 | Four stroke OHC structure engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100185680A CN101235760A (en) | 2008-02-26 | 2008-02-26 | Four stroke OHC structure engine |
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| Publication Number | Publication Date |
|---|---|
| CN101235760A true CN101235760A (en) | 2008-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100185680A Pending CN101235760A (en) | 2008-02-26 | 2008-02-26 | Four stroke OHC structure engine |
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| Country | Link |
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| CN (1) | CN101235760A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881236A (en) * | 2010-05-20 | 2010-11-10 | 苏州市双马机电有限公司 | Four-stroke engine |
| CN103410607A (en) * | 2013-08-14 | 2013-11-27 | 浙江欧利根工具有限公司 | Novel portable high-power engine |
| CN106687678A (en) * | 2014-09-29 | 2017-05-17 | 本田技研工业株式会社 | OHC-type internal combustion engine |
-
2008
- 2008-02-26 CN CNA2008100185680A patent/CN101235760A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881236A (en) * | 2010-05-20 | 2010-11-10 | 苏州市双马机电有限公司 | Four-stroke engine |
| CN103410607A (en) * | 2013-08-14 | 2013-11-27 | 浙江欧利根工具有限公司 | Novel portable high-power engine |
| CN106687678A (en) * | 2014-09-29 | 2017-05-17 | 本田技研工业株式会社 | OHC-type internal combustion engine |
| CN106687678B (en) * | 2014-09-29 | 2019-07-30 | 本田技研工业株式会社 | OHC type internal combustion engine |
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Open date: 20080806 |