CN201027572Y - Four-stroke overhead cam engine - Google Patents
Four-stroke overhead cam engine Download PDFInfo
- Publication number
- CN201027572Y CN201027572Y CNU2006201268988U CN200620126898U CN201027572Y CN 201027572 Y CN201027572 Y CN 201027572Y CN U2006201268988 U CNU2006201268988 U CN U2006201268988U CN 200620126898 U CN200620126898 U CN 200620126898U CN 201027572 Y CN201027572 Y CN 201027572Y
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- camshaft
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- 238000010304 firing Methods 0.000 claims description 10
- 210000000038 chest Anatomy 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims 1
- 230000005855 radiation Effects 0.000 abstract description 6
- 238000007789 sealing Methods 0.000 abstract description 6
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 4
- 230000007935 neutral effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 238000005266 casting Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 210000000707 wrist Anatomy 0.000 description 2
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
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Abstract
The utility model relates to a four strokes top cam type engine, belonging to motion device technical field, which is formed into a whole by a cylinder cover, a cylinder tube, an upper bent axle half box and a chain chamber, wherein, a combustion chamber is formed on the upper part of the cylinder tube; an intake valve and an exhaust valve are separately arranged on two sides of a cylinder axes B1-B1; a cam axle is arranged in the middle of the intake valve and the exhaust valve; the cam axle is parallel with the bent axle and crosses with the cylinder axes B1-B1 vertically. A rocker axle is arranged in the middle of an intake valve rocker and an exhaust valve rocker; the rocker axle is parallel with the bent axle. The utility model reduces the sealing face of body, realizes light weight of the engine, improves radiation in the head of the cylinder, reduces width of the cylinder cover and further reduces the height of the engine. The size of the head of the engine is reduced by reducing numbers of parts of whole valve driving mechanism; therefore the cooling outside the combustion chamber of the engine and the reliability of the whole machine are improved.
Description
Technical field
The utility model relates to a kind of four stroke top placed cam-type engine, belongs to field of power equipment technology.
Background technique
At present, general four stroke top placed cam-type engine, its cylinder head, body casting respectively are the structure of split, the cylinder cover bolt is installed on the body, again camshaft is installed on the cylinder head, its overlapping assembling, thereby number of spare parts is many, sealing surface is many and increase the machining period number, and the part that must add the packing ring class on sealing surface improves the dependence of sealing, thus the wall thickness of increase cylinder part.It generally adopts Single Over Head Camshaft to increase the height of motor in addition, and Dual Over Head Camshaft increases the width of cylinder head.This kind structure all is disadvantageous to the lightweight of motor, the heat radiation of cylinder head.Also proposed a kind of new overhead camshaft type engine in U.S. Patent number is the patent of US 5706769, its intake ﹠ exhaust valves and air inlet and exhaust cam driven member are arranged on the opposite both sides of the single valve door operation cam in the cylinder head.The intake ﹠ exhaust valves door is parallel to each other, 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 valve operation cam rotating center, it is the both sides that rocking arm are arranged in camshaft, adopt two pitman arm shafts of a camshaft, thereby increased part number, and the to-and-fro motion scope of two pitman arm shafts increases, directly influence the heat radiation of cylinder head, influenced the heat radiation of exhaust valve seat and contacting point, firing chamber especially.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned deficiency, thereby provide a kind of body and the synthetic integral body of cylinder head is reduced sealing surface, realizes the lightweight of motor, improves the heat radiation of cylinder head;
Camshaft, rocking arm are arranged in two valve neutral positions, can increase the width of cylinder head, and also reduced the height of motor; By reducing the part number of whole valve actuating mechanism, reduced the size of engine head, help the cooling of engine combustion outdoor, can improve the reliability of complete machine.
Main solution of the present utility model is achieved in that
Body, crankcase cover, valve mechanism cover are by aluminum alloy or magnesium alloy pressure-casting moulding in the utility model; Body is connected with crankcase cover, and the junction plane of body and crankcase cover passes crankshaft center line A1-A1 and cylinder-bore axis B1-B1, and bent axle props up by bearing and is housed on the body machine; Piston is installed in cylinder barrel, and the firing chamber is formed by piston, body, cylinder barrel, and piston connects bent axle by connection rod set, and feature is:
Body is connected to form one by cylinder head, cylinder barrel, last bent axle half chests, chain chamber, and valve mechanism cover is fixed on the cylinder head; Body upper is provided with intake duct, air outlet flue, and intake duct and air outlet flue lay respectively at the both sides of cylinder-bore axis B1-B1; Be provided with the hole with cylinder-bore axis B1-B1 inclination place in intake duct, the intake valve conduit is installed in the hole, and the hole is coaxial with suction valve cone, is installed with intake valve in the intake valve conduit; Be provided with the hole with cylinder-bore axis B1-B1 inclination place in intake duct, the intake valve conduit is installed in the hole, and the hole is coaxial with suction valve cone, is installed with exhaust valve in the intake valve conduit;
By axle camshaft is housed in body upper, cam shaft arrangement is in intake valve and exhaust valve neutral position, and camshaft is parallel to bent axle, and intersects with cylinder-bore axis B1-B1, and is vertical; Timing gear are housed on the bent axle; Accommodate a chain or belt in chain chamber, timing chain or belt are connected the camshaft that is carved with profile of tooth on it with timing gear;
Be provided with the valve rocker seat in body upper, pitman arm shaft is installed in the valve rocker seat, and pitman arm shaft is arranged in the neutral position of inlet valve rocker and exhaust valve rocker arm, and pitman arm shaft is parallel with bent axle, and passes and vertical cylinder axis B1-B1, is positioned at the top of camshaft; Inlet and outlet door rocking arm intersection is through on the pitman arm shaft, and the upper end of the upper end of inlet valve rocker, lower end and exhaust valve rocker arm, lower end lay respectively at the both sides of crankshaft center line A1-A1, and inlet valve rocker, exhaust valve rocker arm can be swung around pitman arm shaft;
On camshaft, be provided with cam that forms one or intake cam and the exhaust cam that forms one;
Inlet valve rocker is divided into two sections, upper end, lower end, and the upper end links to each other with the intake valve root, and the lower end is made circular arc and is contacted with cam or exhaust cam;
Exhaust valve rocker arm is divided into two sections, upper end, lower end, and the upper end links to each other with the exhaust valve root, and the lower end is made circular arc and is contacted with camshaft;
Compared with the prior art the utility model has the following advantages:
The utility model is simple, compact and reasonable for structure; Because body and cylinder head are made an integral body, reduce sealing surface, realized the lightweight of motor, improve the heat radiation of cylinder head; Owing to adopt camshaft, rocking arm to be arranged in two valve neutral positions, reduced the width of cylinder head, and also reduced the height of motor; By reducing the part number of whole valve actuating mechanism, reduced the size of engine head, help the cooling of engine combustion outdoor, improved the reliability of complete machine; This structure can be widely used in petrol engine, diesel engine, and single cylinder, multi-cylinder, air-cooled, on the four stroke engine such as water-cooled.
Description of drawings
Fig. 1 is the utility model structure longitudinal section (embodiment one).
Fig. 2 is the sectional view of the utility model structure A-A.
Fig. 3 is the plan view of the utility model structural drawing 2.
Fig. 4 is the B-B sectional view of the utility model structural drawing 3.
Fig. 5 is the exploded view of the utility model structure valve control mechanism.
Fig. 6 is the longitudinal section (embodiment two) of the utility model structure.
Fig. 7 is the plan view of the utility model structural drawing 6.
Fig. 8 is the C-C sectional view of the utility model structural drawing 6.
Embodiment
Embodiment during following the utility model is incited somebody to action in conjunction with the accompanying drawings is further described:
The utility model is mainly by body 1, crankcase cover 2, valve mechanism cover 3, junction plane 4, bolt 5, bent axle 6, bearing 7,8, cylinder barrel 9, piston 10, firing chamber 11, connection rod set 12, wrist pin 13, intake duct 14, air outlet flue 15, suction valve cone 16, exhaust valve seat 17, suction tude 18, outlet pipe 19, intake valve conduit 20, exhaust valve guide 21, hole 22, hole 23, intake valve 24, exhaust valve 25, inlet-valve spring 26, exhaust valve spring 27, cotter seat 28, cotter seat 29, axle 30, camshaft 31, timing gear 32, timing chain or belt 33, valve rocker seat 34; pitman arm shaft 35; inlet valve rocker 36 (upper end 38; lower end 39); exhaust valve rocker arm 37 (upper end 40; lower end 41); valve adjustments screw 42a; valve adjustments nut 43a; valve adjustments screw 42b; valve adjustments nut 43b; engine cylinder cover 44; chain chamber 45; first crankcase 46; cam 47; spark plug 48; compositions such as intake cam 49 and exhaust cam 50.
Embodiment one: (the shared cam of inlet and exhaust valve)
The utility model is single cylinder Wind-cooling type overhead-cam petrol engine, and the main part body 1 of motor, crankcase cover 2, valve mechanism cover 3 are by aluminum alloy or magnesium alloy compression molding.Body 1 is tiltedly to divide at junction plane 4 places with crankcase cover 2, and connects with many group bolts 5.Body 1 passes crankshaft center line A1-A1 and cylinder-bore axis B1-B1 with the junction plane 4 of crankcase cover 2.The rotation of bent axle 6 is by bearing 7 that is through two ends and bearing 8, and bearing 7 is bearing on the body machine 1, and bearing 8 is bearing on the crankcase cover 2.
Also be equipped with a camshaft 31 by an axle 30 on body 1 top, camshaft 31 is arranged in the neutral position of two valves, and camshaft 31 is parallel to bent axle 6, and intersects with cylinder-bore axis B1-B1, and is vertical.Be provided with integrally formed cam 47 at camshaft 31, camshaft 31 can rotate freely on axle 30.The drive of bent axle 6 is mainly passed through in the rotation of camshaft 31.Timing gear 32 are housed on the bent axle 6, and timing gear 32 interference press fit on the bent axle 6, rotate with bent axle; Accommodate a chain or belt 33 in chain chamber 45, timing chain or belt 33 link together the camshaft 31 that is carved with profile of tooth on it with timing gear 32; And the number by profile of tooth guarantees that the bent axle 6 and the ratio of revolutions of camshaft 31 are 2: 1.Cam 47 on the camshaft 31 departs from not over against inlet and exhaust valve 24,25, be provided with outstanding valve rocker seat 34 on body 1 top; pitman arm shaft 35 is installed in the valve rocker seat 34; pitman arm shaft 35 is arranged in the neutral position of inlet valve rocker 36 and exhaust valve rocker arm 37; pitman arm shaft 35 is parallel with bent axle 6; and pass and vertical cylinder axis B1-B1, be positioned at the top of camshaft 31; Because the inclination of valve, rocking arm is arranged in the neutral position of two valves very easily; One end of pitman arm shaft 35 is made outstanding, is used to valve mechanism cover 3 contact preventing slippages.Inlet valve rocker 36 is divided into two sections, and upper end 38, lower end 39 are equipped with valve adjustments screw 42a valve adjustments nut 43a and are linked to each other with intake valve 24 roots on the upper end 38, and 39 one-tenth one circular arcs in lower end contact with cam 47; Exhaust valve rocker arm 37 is divided into two sections, and upper end 40, lower end 41 are equipped with valve adjustments screw 42b valve adjustments nut 43b and are linked to each other with exhaust valve 25 roots on the upper end 40, and 41 one-tenth one circular arcs in lower end contact with camshaft 31; Inlet and exhaust valve rocking arm 36,37 shared pitman arm shafts 35, and cam 47, and thereby inlet and exhaust valve rocking arm 36,37 intersects to be through and is connected on the body 1 on the pitman arm shaft 35, make upper end 38, the lower end 39 of inlet valve rocker 36, the upper end 40 of exhaust valve rocker arm 37, lower end 41 lay respectively at the both sides of crankshaft center line A1-A1, and inlet valve rocker 36, exhaust valve rocker arm 37 can be around pitman arm shaft 35 swings.
Its working procedure:
When bent axle 6 rotation, bent axle 6 drives camshafts 31 with 1/2 revolution rotation by timing chain 33, thereby promotes inlet valve rocker 36 lower ends 39 of contact with it, the lower end 41 of exhaust valve rocker arm 37 by cam 47.Make upper end 40 swings of inlet valve rocker 36 upper ends 38, exhaust valve rocker arm 37, overcome the resistance of inlet-valve spring 26 and exhaust valve spring 27, open intake valve 24 and exhaust valve 25.
On the other hand, the lower end 41 of inlet valve rocker 36 lower ends 39, exhaust valve rocker arm 37 abuts in cam 47, when cam 47 continues rotation to inlet valve rocker 36, when exhaust valve rocker arm 37 does not have pressure, intake valve 24 and exhaust valve 25 rely on the elastic force of inlet-valve spring 26 and exhaust valve spring 27 to open, and finish resetting of inlet valve rocker 36, exhaust valve rocker arm 37.
Embodiment two: (the inlet and outlet door uses a cam respectively)
In conjunction with forming one, a firing chamber 11 is formed engine body 1 on the top of body upper cylinder tube 9 by cylinder head 44, the cylinder barrel 9 that holds piston, chain chamber 45, last bent axle half chests 46, and spark plug 48 is used for lighting a fire of timing herein in the firing chamber.
Also be equipped with a camshaft 31 by an axle 30 on body 1 top, camshaft 31 is arranged in the neutral position of two valves, and camshaft 31 is parallel to bent axle 6, and intersects with cylinder-bore axis B1-B1, and is vertical.Be provided with integrally formed intake cam 49, exhaust cam 50 at camshaft 31, drive intake valve 24, exhaust valve 25 respectively.
Also have an outstanding valve rocker seat 34 on body 1 top, be used to assemble a pitman arm shaft 35, pitman arm shaft 35 is parallel with bent axle 6, and passes and vertical cylinder axis B1-B1, is positioned at the top of camshaft 30; Because the inclination of valve, rocking arm is arranged in the neutral position of two valves very easily.Inlet valve rocker 36 is divided into two sections, and upper end 38, lower end 39 are equipped with valve adjustments screw 42a valve adjustments nut 43a and are linked to each other with intake valve 24 roots on the upper end 38, and 39 one-tenth one circular arcs in lower end contact with intake cam 49; Exhaust valve rocker arm 37 is divided into two sections, and upper end 40, lower end 41 are equipped with valve adjustments screw 42b valve adjustments nut 43b and are linked to each other with exhaust valve 25 roots on the upper end 40, and 41 one-tenth one circular arcs in lower end contact with exhaust cam 50; Inlet and exhaust valve rocking arm 36,37 shared pitman arm shafts 35, and thereby inlet and exhaust valve rocking arm 36,37 is through and is connected on the body 1 on the pitman arm shaft 35, make the upper end 40 of upper end 38, lower end 39 and the exhaust valve rocker arm 37 of inlet valve rocker 36, the both sides that lower end 41 lays respectively at crankshaft center line A1-A1, and inlet valve rocker 36, exhaust valve rocker arm 37 can be around pitman arm shaft 35 swings.
When engine operation, same camshaft rotates like this, and intake and exhaust cam is opened inlet and exhaust valve accordingly, again because inlet and exhaust valve is closed in the effect of return spring accordingly, guarantees the reliably working of four strokes of motor when continuing rotation.
Claims (6)
1. a four stroke top placed cam-type engine adopts body (1) to be connected with crankcase cover (2), and bent axle (6) props up by bearing and is housed on the body (1); Piston (10) is installed in cylinder barrel (9), and firing chamber (11) are formed by piston (10), body (1), cylinder barrel (9), and piston (10) connects bent axle (6) by connection rod set (12), it is characterized in that:
A, body (1) are connected to form one by cylinder head (44), cylinder barrel (9), last bent axle half chests (46), chain chamber (45), and valve mechanism cover (3) is fixed on the cylinder head (44);
B, body (1) top are provided with intake duct (14), air outlet flue (15), and intake duct (14) and air outlet flue (15) lay respectively at the both sides of cylinder-bore axis (B1-B1); Be provided with hole (22) with cylinder-bore axis (B1-B1) inclination place in intake duct (14), intake valve conduit (20) is installed in the hole (22), and hole (22) are coaxial with suction valve cone (16), are installed with intake valve (24) in intake valve conduit (20); Be provided with hole (23) with cylinder-bore axis (B1-B1) inclination place in intake duct (15), intake valve conduit (21) is installed in the hole (23), and hole (22) are coaxial with suction valve cone (17), are installed with exhaust valve (25) in intake valve conduit (21);
C, by axle (30) camshaft (31) is housed on body (1) top, camshaft (31) is arranged in the middle of intake valve (24) and the exhaust valve (25), and camshaft (31) is parallel to bent axle (6), and intersects with cylinder-bore axis (B1-B1), and is vertical; Timing gear (32) are housed on the bent axle (6); Hold a chain or belt (33) in chain chamber (45), timing chain or belt (33) are connected camshaft (31) with timing gear (32);
D, be provided with valve rocker seat (34); pitman arm shaft (35) is installed in the valve rocker seat (34); pitman arm shaft (35) is arranged in the centre of inlet valve rocker (36) and exhaust valve rocker arm (37); pitman arm shaft (35) is parallel with bent axle (6) on body (1) top; and pass also vertical cylinder axis (B1-B1), be positioned at the top of camshaft (31); Inlet valve rocker (36), exhaust valve rocker arm (37) intersection are through on the pitman arm shaft (35), the upper end (40) of the upper end (38) of inlet valve rocker (36), lower end (39) and exhaust valve rocker arm (37), lower end (41) lay respectively at the both sides of crankshaft center line (A1-A1), and inlet valve rocker (36), exhaust valve rocker arm (37) can be swung around pitman arm shaft (35).
2. four stroke top placed cam-type engine according to claim 1 is characterized in that described camshaft (31) is provided with cam (47) that forms one or intake cam (49) and the exhaust cam (50) that forms one.
3. four stroke top placed cam-type engine according to claim 1 is characterized in that the upper end (38) of described inlet valve rocker (36) links to each other with intake valve (24) root, and lower end (39) are made circular arc and contacted with cam (47).
4. four stroke top placed cam-type engine according to claim 1 is characterized in that the upper end (40) of described exhaust valve rocker arm (37) links to each other with exhaust valve (25) root, and lower end (41) are made circular arc and contacted with camshaft (31).
5. four stroke top placed cam-type engine according to claim 1 and 2 is characterized in that being carved with profile of tooth on the described camshaft (31).
6. four stroke top placed cam-type engine according to claim 1 is characterized in that described body (1), crankcase cover (2), valve mechanism cover (3) are respectively by aluminum alloy or magnesium alloy materials die cast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201268988U CN201027572Y (en) | 2006-10-28 | 2006-10-28 | Four-stroke overhead cam engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006201268988U CN201027572Y (en) | 2006-10-28 | 2006-10-28 | Four-stroke overhead cam engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201027572Y true CN201027572Y (en) | 2008-02-27 |
Family
ID=39131777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006201268988U Expired - Lifetime CN201027572Y (en) | 2006-10-28 | 2006-10-28 | Four-stroke overhead cam engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201027572Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100434657C (en) * | 2006-10-28 | 2008-11-19 | 无锡开普动力有限公司 | Four-stroke overhead cam engine |
-
2006
- 2006-10-28 CN CNU2006201268988U patent/CN201027572Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100434657C (en) * | 2006-10-28 | 2008-11-19 | 无锡开普动力有限公司 | Four-stroke overhead cam engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20081119 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |