CN1401884A - Valve operating mechanism of engine, and assembling method therefor - Google Patents
Valve operating mechanism of engine, and assembling method therefor Download PDFInfo
- Publication number
- CN1401884A CN1401884A CN02142171.4A CN02142171A CN1401884A CN 1401884 A CN1401884 A CN 1401884A CN 02142171 A CN02142171 A CN 02142171A CN 1401884 A CN1401884 A CN 1401884A
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- China
- Prior art keywords
- cam follower
- cam
- rocking arm
- arm shaft
- pitman arm
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Valve-Gear Or Valve Arrangements (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
A valve operating mechanism is provided with rocker shafts, cam followers press-fitted to one end of the rocker shafts respectively, and rocker arms press-fitted to the other end of the rocker shafts respectively. Approximal surfaces are formed in the cam followers and the rocker arms respectively, and reference planes are formed in a engine body, which come in mutual contact with the approximal surfaces in their rotational direction when the relative phase angle of the cam followers and the rocker arms is proper with each other. Thereby, the invention enables fixing of the cam followers and the rocker arms to the rocker shafts at a proper phase angle and checking if their relative phase angle is proper.
Description
[technical field]
The present invention relates to a kind of valve operating mechanism of motor, it comprise with bent axle motion on be operatively connected cam, be rotatably supported in pitman arm shaft in the engine body bearing saddle bore, respectively be fixed on the rocking arm that an end of each pitman arm shaft and the cam follower that its top contacts with cam slide and the other end that is fixed on pitman arm shaft and its top link to each other with valve on being installed in engine body, the invention still further relates to a kind of method of assembling valve operating mechanism.
[background technique]
Claimant of the present invention had once proposed so a kind of engine valve operating mechanism (referring to Japanese patent application 2000-276459).In this mechanism, the cam that diameter is bigger is arranged on a side of engine body, and the less pitman arm shaft of rocking arm and diameter is set directly at the top of engine body.Therefore, limited valve operating mechanism and protruded upward, thereby reduced the whole height of motor, and and then made the engine structure compactness.
In this valve operating mechanism, in order suitably to open and close valve by cam, it is suitable mutually to require around the phase place of the cam follower of pitman arm shaft axis and rocking arm.
[summary of the invention]
Therefore, purpose of the present invention is exactly that a kind of engine valve operating mechanism and a kind of method of assembling this valve operating mechanism will be provided, wherein, cam follower and rocking arm can be fixed on the pitman arm shaft and have suitable phase place, and can confirm whether the mutual phase place between cam follower and the rocking arm is suitable.
For achieving the above object, according to first characteristics of the present invention, a kind of valve operating mechanism of motor is provided, it has, with the cam that is operatively connected in the bent axle motion, be rotatably supported in the pitman arm shaft in the engine body bearing saddle bore, respectively be fixed on the rocking arm that an end of each pitman arm shaft and the cam follower that its top contacts with cam slide and the other end that is fixed on pitman arm shaft and its top link to each other with valve on being installed in engine body, wherein, on cam follower and rocking arm, be provided with approximal surface, and reference plane is set on engine body, thereby when mutual when suitable around the phase place of the cam follower of pitman arm shaft axis and rocking arm, approximal surface and reference plane abut in together mutually along the sense of rotation of cam follower and rocking arm.
By these characteristics, in assembly process, abut in the reference plane of engine body by making approximal surface, it is suitable just can to guarantee to make around the phase place of the cam follower of pitman arm shaft axis and rocking arm.Therefore, just can synchronously open and close valve by rotating cam.
According to second characteristic of the present invention, the method of the engine valve operating mechanism that a kind of assembling has above-mentioned first characteristics is provided, it comprises the steps: that an end is force-fitted in cam follower and rocking arm each pitman arm shaft on one of them to be installed in the bearing saddle bore, one of them approximal surface of cam follower and rocking arm is abutted in the corresponding reference plane, and under this state, in cam follower and the rocking arm another is press fit into the other end of pitman arm shaft, simultaneously another approximal surface abutted in the corresponding reference plane.
By above-mentioned second characteristic, when being connected to cam follower and rocking arm on the pitman arm shaft, just can confirm to form suitable phase place between cam follower and the rocking arm, thereby make this mechanism have gratifying quality and productivity.
The above-mentioned purpose, feature and advantage with other of the present invention can be by clearly drawing in the description of the preferred embodiment of the present invention being carried out below in conjunction with accompanying drawing.
[description of drawings]
Fig. 1 is the vertical section figure of the motor of the present invention with valve operating mechanism.
Fig. 2 is the exploded view of essential portion of FIG. 1.
Fig. 3 is the sectional drawing of Fig. 1 along 3-3.
Fig. 4 is the sectional drawing of Fig. 3 along 4-4.
Fig. 5 is the sectional drawing of Fig. 4 along 5-5.
Fig. 6 is the sectional drawing of Fig. 4 along 6-6.
Fig. 7 A and 7B are and the corresponding view of Fig. 5 only to show the assembly process of valve operating mechanism.
Fig. 8 A and 8B are and the corresponding view of Fig. 6 only to show the assembly process of valve operating mechanism.
Fig. 9 is the front view of driven pulley/cam pack in the valve operating mechanism.
Figure 10 is the sectional drawing of Fig. 9 along 10-10.
Figure 11 is the sectional drawing of Figure 10 along 11-11.
[embodiment]
Below in conjunction with accompanying drawing embodiments of the invention are described.
Shown in Fig. 1-4 and 6, the engine body 1 of motor E comprises crankcase 2 with crankshaft cavity 2a, have the cylinder body 3 of single cylinder hole 3a and have firing chamber 5 and lead to the air inlet of firing chamber 5 and the cylinder cap 4 of relief opening 6,7.
The bent axle 10 that is arranged among the crankshaft cavity 2a is bearing on the horizontal relative sidewall of crankcase 2 by the bearing 11 and 11 ' that is arranged on the crankcase 2 horizontal opposing sidewalls.
The belt conduit 13 of flat cross section is connected as a single entity with the roof of fuel tank 12, and vertically extends through roof.The lower end of belt conduit 13 extends near the bent axle 10 that is arranged in fuel tank 12.The upper end of belt conduit 13 and cylinder cap 4 are connected as a single entity, thereby enjoy partition wall 14 jointly with cylinder cap 4.Form a series of ring packing flange 15 at the periphery of cylinder cap 4 and the upper end of belt conduit 13, partition wall 14 upwards stretches out from sealing flange 15.
Be provided with annular seal groove 16 on the lower end surface of top cover 8, top cover 8 links to each other with the upper end of cylinder cap 4 and is corresponding with sealing flange 15.Being provided with line seal groove 17 at the internal surface of top cover 8 communicates with the relative both sides that allow annular seal groove 16.Lip ring 18 is installed in the annular seal groove 16, and line seal part 19 forms one with lip ring 18 and is installed in the line seal groove 17.Top cover 8 links to each other with cylinder cap 4 by bolt, thereby sealing flange 15 is contacted with lip ring 18 pressure, and partition wall 14 is contacted with line seal part 19 pressure.
Being respectively applied for the suction valve 22i that opens and closes suction port 6 and relief opening 7 and outlet valve 22e is parallel to cylinder hole 7a and is arranged in the cylinder cap 4.
To the valve operating mechanism 23 that be used to open and close suction valve 22i and outlet valve 22e be described below.
Shown in Fig. 1-6, valve operating mechanism 23 comprises synchronous transmission device 23a and cam gear 23b, synchronous transmission device 23a extends to first valve manipulation chamber 21a from the inside of fuel tank 12, and cam gear 23b handles chamber 21a from first valve and extends to second valve manipulation chamber 21b.
Pair of bearings block set 31i and 31e and cylinder cap 4 forms one, and is parallel to supporting axle 39 and handles chamber 21b from partition wall 14 to second valve and stretch out.Cam gear 23b comprises cam 29, intake rocker axle 33i and exhaust rocker arm axle 33e, intake cam follower 34i and exhaust cam follower 34e, intake rocker 35i and exhaust rocker arm 35e and air inlet spring 38i and exhaust spring 38e, intake rocker axle and exhaust rocker arm axle are rotatably supported in respectively among the bearing saddle bore 32i and 32e among bearing block set 31i and the 31e, in intake cam follower and the exhaust cam follower each all is force-fitted in the end of each pitman arm shaft 33i and 33e, and to cam 29 extensions, intake rocker and exhaust rocker arm are handled the other end that is press fit into air inlet and exhaust rocker arm axle 33i and 33e among the 21b of chamber at second valve, and to suction valve 22i and outlet valve 22e extension, air inlet spring and exhaust spring are installed on suction valve 22i and the outlet valve 22e, so that along closing direction bias voltage these valves 22i and 22e.Intake cam follower 34i and exhaust cam follower 34e are arranged to make the slidingsurface 36,36 that is positioned at its top upper surface and the lower surface sliding contact of cam 29.Intake rocker 35i and exhaust rocker arm 35e are arranged to make the reclining upper end of suction valve 22i and outlet valve 22e of the adjustment bolt 37,37 that is installed in its top by screw thread.
Supporting axle 39 and air inlet, exhaust rocker arm axle 33i and 33e are arranged on the ring packing flange 15 of cylinder cap 4 and the top of belt conduit 13 upper ends.Therefore, under the situation of pulling down top cover 8, just can above sealing flange 15, mount and dismount supporting axle 39 and air inlet, exhaust rocker arm axle 33i and 33e, and can not be subjected to the obstruction of sealing flange 15, therefore have good assembling capacity and be convenient to maintenance.
Shown in Fig. 5-8, approximal surface 40i and 40e are formed at intake cam follower 34i relative with slidingsurface 36,36 and the rear portion of exhaust cam follower 34e respectively, and are parallel to the axis of pitman arm shaft 33i and 33e.Approximal surface 41i is formed at intake rocker 35i relative with the extension of adjusting bolt 37,37 and the rear portion of exhaust rocker arm 35e respectively with 41e.In addition, reference plane 42i and 42e and reference plane 43i and 43e are arranged on the cylinder cap 4, at intake cam follower 34i and intake rocker 35i when the outside of cylinder cap and sidepiece rotate, reference plane 42i and 42e are towards approximal surface 40i and 40e, and at exhaust cam follower 34e and exhaust rocker arm 35e when the outside of cylinder cap and sidepiece rotate, reference plane 43i and 43e are towards approximal surface 41i and 41e.
If mutually during coadaptation, approximal surface 40i and 41i and reference plane 42i and 43i abut in together simultaneously mutually around the phase place of intake rocker axle 33i for intake cam follower 34i and intake rocker 35i.If mutually during coadaptation, approximal surface 40e and 41e and reference plane 42e and 43e abut in together simultaneously mutually around the phase place of exhaust rocker arm axle 33e for exhaust cam follower 34e and exhaust rocker arm 35e.All reference plane 42i, 42e, 43i and 43e are arranged on the sustained height position, and therefore, they can carry out work simultaneously.
For intake cam follower 34i and intake rocker 35i are installed on the intake rocker axle 33i, at first intake cam follower 34i is press-fitted the end that merging is fixed to pitman arm shaft 33i and 33e, and pitman arm shaft 33i and 33e are inserted among bearing saddle bore 32i and the 32e.Then, shown in Fig. 7 B and 8B, intake rocker 35 rotates to outside and sidepiece from cylinder cap 4, and approximal surface 40i and 40e are abutted in corresponding reference plane 42i and 42e.Under this state, if intake rocker 35i is press-fitted the other end that merging is fixed to pitman arm shaft 33i and 33e, and its approximal surface 41i and 41e are abutted in corresponding reference plane 43i and 43e, just can make intake cam follower 34i and intake rocker 35i form suitable relative phase around intake rocker axle 33I.Certainly, also can make exhaust cam follower 34e and exhaust rocker arm 35e form suitable relative phase in the same way around exhaust rocker arm axle 33e.At first rocking arm 35i and 35e being press fit under the situation of pitman arm shaft 33i and 33e, also can obtain identical effect.After assembling finished, shown in Fig. 7 A and 8A, cam follower 34i and 34e and rocking arm 35i and 35e just forwarded on the working position that is positioned at cylinder cap 4 middle parts.
Shown in Figure 4 and 5, secondary spring 45i and 45e are separately positioned between cylinder cap 4 and the intake cam follower 34i and between cylinder cap 4 and the exhaust cam follower 34e, so that promote intake cam follower 34i and exhaust cam follower 34e along the action direction of air inlet spring 38i and exhaust spring 38e.Among secondary spring 45i and the 45e each all is a torsion spring, it comprises the spiral part 46 on corresponding one outer periphery that is installed among pitman arm shaft 33i and the 33e, stationary end 47 is locked on the lock section 49 of cylinder cap 4, corresponding one among movable end 48 and cam follower 34i and the 34e links to each other, and upwards bias voltage cam follower 34i and 34e.
Shown in Fig. 9-11, cam 29 by be rotatably supported in the sintered alloy that cylindrical shape wheel hub 30 on the supporting axle 39 forms one and constitute.In the case, wheel hub 30 is arranged to stretch out in an end face of cam 29, and has the tangent plane 30a that is positioned on its top outer peripheral surface.An end face at cam 29 is provided with around the groove 51 of wheel hub 30 and the radial protrusion 52 that stretches out from the bottom surface of groove 51.The shape of groove 51 is similar to the outer peripheral surface of cam 29 basically, and therefore, the wall thickness that centers on the cam 29 of groove 51 is constant basically.
As illustrated in fig. 1 and 2, a certain amount of lubricant oil o that injects through lubricant oil inlet 12a is stored in fuel tank 12.A pair of oil thrower 55a and 55b are fixed on the bent axle 13 that is arranged in fuel tank 40 with press fit or similar mode, and are arranged in the relative both sides of drive pulley 24 vertically.Oil thrower 56a and 56b extend radially out along opposite direction, and along the direction bending that its top axially is being separated from each other out.When bent axle 13 rotates oil thrower 56a and 56b, at least one oil thrower 56a and 56b stir and diffusion fuel tank 40 in lubricant oil o, thereby produce mist of oil, even also be like this in any one working position of motor E.Meanwhile, the mist of oil that is produced enters first valve and handles chamber 21a and lubricate synchronous transmission device 23a, and is recycled to crankshaft cavity 6a, second valve manipulation chamber 21b and fuel tank 12 and lubricates each parts and cam gear 22b among the crankshaft cavity 2a.
This embodiment's working condition will be described below.
In bent axle 10 rotation processes, therewith the drive pulley 24 of Zhuan Donging drives driven pulley 25 and cam 29 by belt 26, and cam 29 is suitably swung air inlet and exhaust cam follower 32i and 32e.This swing passes to air inlet and exhaust rocker arm 35i and 35e by corresponding pitman arm shaft 33i and 33e, and makes air inlet and exhaust rocker arm 35i and 35e swing.Therefore, by cooperate with air inlet and exhaust spring 38i and 38e just can be suitable opening and closing intake ﹠ exhaust valves 22i and 22e.
In this process, cam 29 and wheel hub 30 are lubricated by the mist of oil that results from the fuel tank 12.But cam 29 and wheel hub 30 are made by the sintered alloy that contains countless micropores, thereby lubricant oil can remain in these micropores.Therefore, the part of cam 29 and wheel hub 30 and cam follower 34i and 34e sliding contact and cam 29 and wheel hub 30 rotate on supporting axle 39 and the part of sliding all can be lubricated effectively, thereby avoided wearing and tearing, and the life-span of therefore having improved these parts.
And wheel hub 30 is rotatably supported on the supporting axle 39, and supporting axle 39 also is rotatably supported on two relative sidewalls of first valve manipulation chamber 21a.Therefore, in driven pulley 25 and cam 29 rotation processes, supporting axle 39 also rotates and is subjected to the rubbing action of frictional force, has therefore reduced the speed discrepancy between wheel hub 30 and the supporting axle 39.This has just reduced the wearing and tearing of rotation and slide member, and has improved the life-span of rotation and slide member.
In addition, the driven pulley that driven by belt 26 by drive pulley 24 25 is made by synthetic resin, therefore, although its diameter is bigger, weight is less relatively, therefore, alleviate the weight of driven pulley/cam pack 50, and and then alleviated the weight of motor E.
And, because driven pulley 25 molded being connected on cam 29 and the wheel hub 30, therefore, need not other particular component and just can constitute driven pulley/cam pack 50, thereby further alleviated the weight of assembly 50.
In addition, when driven pulley 25 is molded when being connected on cam 29 and the wheel hub 30, the outer peripheral surface of wheel hub 30 and tangent plane 30a by the material of driven pulley 25 just synthetic resin surrounded, the groove 51 of cam 29 is full of synthetic resin, therefore, improved between driven pulley 25 and wheel hub 30 and the cam 29 in rotational direction and the axial power that is connected.
Particularly since the shape of groove 51 shape with the outer peripheral surface of cam 29 is identical basically, therefore, improved driven pulley 25 and the be connected power of cam 29 effectively in sense of rotation.And, because the wall thickness that cam 29 centers on groove 51 is constant basically, therefore, has reduced the thermal distortion of cam 29 in sintering process, thereby improved the precision of cam profile shape.
The base circle portion of cam 29 is relative with exhaust cam follower 34e with intake cam follower 34i.Under the situation of having removed the downward thrust that acts on base circle portion, when the biasing force of air inlet spring 38i and exhaust spring 38e is opened suction valve 22i and outlet valve 22e, suction valve 22i and outlet valve 22e upwards push away rocking arm 35i and 35e, thereby the end of each pitman arm shaft 33i and 33e is upwards pushed away, and simultaneously around its axis swing, and there is a pair of masterpiece to be used for pitman arm shaft 33i and 33e.
When intake cam follower 34i and exhaust cam follower 34e are supported on the base circle portion of cam 29 separately, and the release of the downward Driving force on the response cam follower, the biasing force of air inlet spring 38i and exhaust spring 38e is closed suction valve 22i and outlet valve 22e, then, suction valve 22i and outlet valve 22e upwards promote rocking arm 35i and 35e, and make rocking arm 35i and 35e axis swing around them, thereby act on the end of each pitman arm shaft 33i and 33e, thereby upwards promote them and a pair of power is applied on pitman arm shaft 33i and the 33e.
But, secondary spring 45i that links to each other with 34e with cam follower 34i and the biasing force of 45e make thrust upwards always act on the other end of pitman arm shaft 33i and 33e, and this is offset by thrust power, therefore; pitman arm shaft 33i and 33e are pushed against on the upper surface of bearing saddle bore 32i and 32e fully; thus avoided in advance by this caused flutter of power, and avoided the generation of extraordinary noise and gouging abrasion in advance.
The cam 29 that diameter is bigger is arranged on the same side of cylinder cap 4 with driven pulley 25, and has only less air inlet of air inlet and exhaust rocker arm 35i and 35e and diameter and exhaust rocker arm axle 33i and 33e to be set directly at the top of cylinder cap 4.Therefore therefore, valve operating mechanism 23 can not be overhanging significantly above cylinder cap 4, just reduced the whole height of motor E, and and then make motor E compact structure.
In the process of assembling cam follower 34i and 34e and rocking arm 35i and 35e, be fixed on the cam follower 34i of pitman arm shaft 33i and 33e opposite end and 34e and rocking arm 35i and 35e its approximal surface 40i and 40e are abutted in reference plane 42i, 42e, 43i and the 43e of cylinder cap 4, thereby make intake cam follower 34i and intake rocker 35i around pitman arm shaft 33i and the 33e form suitable phase place.Therefore, just can synchronously open and close intake ﹠ exhaust valves 22i and 22e by rotating cam 29.
Particularly, in assembly process, each cam follower 34i and 34e are press fit into the end of each pitman arm shaft 33i and 33e, and pitman arm shaft 33i and 33e be installed among the bearing saddle bore 32i and 32e of bearing block set 31i and 31e, then, rocking arm 35i and 35e are press fit into the other end of pitman arm shaft 33i and 33e.Meanwhile, the approximal surface 41i of rocking arm 35i and 35e and 41e are press fit on corresponding reference plane 43i and the 43e, and abut on corresponding reference plane 43i and the 43e.Therefore, when being connected to cam follower 34i and 34e and rocking arm 35i and 35e on pitman arm shaft 33i and the 33e, can make cam follower 34i and 34e and rocking arm 35i and 35e form suitable phase place, so quality and productivity all are gratifying.
Although the embodiments of the present invention have been described in detail, it will be understood that the present invention is not limited to the above-described embodiments, and without departing from the spirit and scope of the invention defined in the claims, the present invention also can have multiple modification.
Claims (2)
1. the valve operating mechanism of a motor, it has, with the cam that is operatively connected in the bent axle motion, be rotatably supported in pitman arm shaft in the engine body bearing saddle bore, respectively be fixed on an end of each described pitman arm shaft and the cam follower that its top contacts with cam slide, and be fixed on the rocking arm that the other end of described pitman arm shaft and its top link to each other with valve on being installed in engine body
Wherein, on described cam follower and described rocking arm, be formed with approximal surface, and on described engine body, be formed with reference plane, thereby when mutual when suitable around the phase place of the described cam follower of described pitman arm shaft axis and described rocking arm, described approximal surface and described reference plane abut in together mutually along the sense of rotation of described cam follower and described rocking arm.
2. method of assembling the described engine valve operating mechanism of claim 1, it comprises the steps:
One end is force-fitted in described cam follower and described rocking arm each pitman arm shaft on one of them to be installed in the described bearing saddle bore;
One of them described approximal surface of described cam follower and described rocking arm is abutted in the corresponding reference plane;
Under this state, in described cam follower and the described rocking arm another is press fit into the other end of described pitman arm shaft, simultaneously another approximal surface is abutted in the corresponding reference plane.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP259940/2001 | 2001-08-29 | ||
| JP2001259940A JP3986782B2 (en) | 2001-08-29 | 2001-08-29 | Engine valve mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1401884A true CN1401884A (en) | 2003-03-12 |
| CN1289794C CN1289794C (en) | 2006-12-13 |
Family
ID=19087221
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02252038 Expired - Lifetime CN2572008Y (en) | 2001-08-29 | 2002-08-29 | Valve operation mechanism for engine |
| CN02142171.4A Expired - Lifetime CN1289794C (en) | 2001-08-29 | 2002-08-29 | Valve operating mechanism of engine, and assembling method therefor |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02252038 Expired - Lifetime CN2572008Y (en) | 2001-08-29 | 2002-08-29 | Valve operation mechanism for engine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3986782B2 (en) |
| CN (2) | CN2572008Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427746C (en) * | 2006-09-30 | 2008-10-22 | 无锡开普动力有限公司 | Four-stroke engine |
| CN101765477B (en) * | 2007-04-11 | 2011-06-22 | 本田技研工业株式会社 | Method and apparatus for inserting a valve into a valve guide |
-
2001
- 2001-08-29 JP JP2001259940A patent/JP3986782B2/en not_active Expired - Fee Related
-
2002
- 2002-08-29 CN CN 02252038 patent/CN2572008Y/en not_active Expired - Lifetime
- 2002-08-29 CN CN02142171.4A patent/CN1289794C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100427746C (en) * | 2006-09-30 | 2008-10-22 | 无锡开普动力有限公司 | Four-stroke engine |
| CN101765477B (en) * | 2007-04-11 | 2011-06-22 | 本田技研工业株式会社 | Method and apparatus for inserting a valve into a valve guide |
Also Published As
| Publication number | Publication date |
|---|---|
| CN2572008Y (en) | 2003-09-10 |
| JP3986782B2 (en) | 2007-10-03 |
| CN1289794C (en) | 2006-12-13 |
| JP2003065012A (en) | 2003-03-05 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20061213 |
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| CX01 | Expiry of patent term |