CN102383887B - A kind of valve control machanism of overhead camshaft engine - Google Patents
A kind of valve control machanism of overhead camshaft engine Download PDFInfo
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- CN102383887B CN102383887B CN201110328786.6A CN201110328786A CN102383887B CN 102383887 B CN102383887 B CN 102383887B CN 201110328786 A CN201110328786 A CN 201110328786A CN 102383887 B CN102383887 B CN 102383887B
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- rocking arm
- valve
- camshaft
- cross bar
- tappet
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- 230000007246 mechanism Effects 0.000 claims description 17
- 230000033001 locomotion Effects 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Abstract
A kind of valve control machanism of overhead camshaft engine, including camshaft, rocking arm, valve, valve spring, described rocking arm two ends press the cam on described camshaft and valve respectively, valve described in valve spring extruding makes valve close, and also includes the rocking arm framework of fixing described rocking arm；Present invention application advantage is notable, eliminates former rocker arm shaft, rocker arm shaft assembly and bearing cap, and structure is the simplest, compact；After cancelling rocker arm shaft, decrease friction loss, make the frictional work loss of electromotor reduce；Cost is obviously reduced；And by new rocking arm framework, overall assembling, the most simply, convenient.
Description
Technical field
The present invention relates to automotive engine applications, the valve particularly to a kind of overhead camshaft engine controls
Mechanism, the valve of this electromotor is controlled to open and close by rocking arm.
Background technology
The main body of camshaft is a cylindrical barred body identical with cylinder group length.It is cased with several above convex
Wheel, is used for driving valve.One end of camshaft is bearings point, and the other end is connected with driving wheel.
The camshaft installation position of electromotor be equipped with underlying, in put, three kinds of forms of overhead.Motorcar engine due to
Rotating speed is very fast, and rotating speed per minute is up to more than 5000 turns, for ensureing intake and exhaust efficiency, all uses inlet valve with
The form of exhaust valve reversal of the natural order of things, i.e. overhead valve device, this device is suitable for by three kinds of installation shapes of camshaft
Formula.But, if using underneath type or the camshaft of middle, due to valve and camshaft distance relatively
Far, needing the auxiliary component such as valve lifter and tappet, cause valve train parts more, structure is complicated, sends out
Motivation volume is big, and is also easy to produce noise under running up, and uses overhead camshaft the most permissible
Change this phenomenon.So, modern car engine the most all have employed overhead camshaft, by camshaft
Be arranged in the top of electromotor, shorten the distance between camshaft and valve, eliminate valve tappet and
Tappet, simplifies camshaft to the drive mechanism between valve, the structure of electromotor is become compacter.
The more important thing is, this mounting means can reduce the reciprocating quality of whole system, improves transmission effect
Rate.Therefore, overhead camshaft engine uses the most universal on automobile.
At present, in the valve mechanism of overhead camshaft engine is arranged, usually camshaft actuated rocking arm,
Rocking arm swings up and down the opening and closing realizing valve in rocker arm shaft, in addition to rocker arm shaft and assembly, also
Needing rocker arm shaft bearing cap, and camshaft-bearing cap, structure is extremely complex, and cost is the highest., as in
State's patent publication No. be disclosed in the Chinese invention patent application file of CN10319621A as, rocker arm shaft
Material and requirement on machining accuracy the highest, rocking arm slip on rocker arm shaft also serves as friction pair and consumes and start
Machine frictional work.Therefore, total is extremely complex, and part is more, assembles loaded down with trivial details, and cost is the highest.
Summary of the invention
Whole knot in the invention aims to overcome the valve mechanism of current overhead camshaft engine to arrange
Structure is extremely complex, and part is more, assembles loaded down with trivial details, and cost also compares high deficiency, it is provided that a kind of overhead cam
The valve control machanism of shaft generator.
The present invention is to realize its purpose to the technical scheme is that the valve of a kind of overhead camshaft engine
Controlling organization, including camshaft, rocking arm, valve, valve spring, institute is pressed at described rocking arm two ends respectively
The cam on camshaft stated and valve, the valve described in valve spring extruding makes valve close, and also includes solid
The rocking arm framework of fixed described rocking arm；Described rocking arm framework is fixed on cylinder cap, including substantially convex with described
The parallel cross bar of wheel shaft and the one group of montant being fixed on cylinder cap, described cross bar forms one with all of montant
Group portal frame, is provided with the rocking arm fixed mechanism of fixing described rocking arm on the downside of described cross bar, and described shakes
The rocking arm that arm fixed mechanism is fixing described from the centre of rocking arm, forms one with fixing point in the middle part of rocking arm as fulcrum
Swinging structure.
Further, in the valve control machanism of above-mentioned a kind of overhead camshaft engine: described rocking arm
Fixed mechanism includes that being arranged on the fixing described rocking arm on the downside of described cross bar makes it not indulge along described cross bar
Tappet to the bayonet socket of motion with the rocking arm described in control with the spacing of cross bar.
Further, in the valve control machanism of above-mentioned a kind of overhead camshaft engine: described tappet
For the scalable tappet of mechanical length, hydraulic tappet can also be made equally.
Further, in the valve control machanism of above-mentioned a kind of overhead camshaft engine: described rocking arm
Contacted with described cam by a roller.
Further, in the valve control machanism of above-mentioned a kind of overhead camshaft engine: described montant
Bottom be provided with the base being fixed on described cylinder cap, Its lower side is provided with and described camshaft phase
The bearing connect.
Further, in the valve control machanism of above-mentioned a kind of overhead camshaft engine: described rocking arm
Framework is bolted on described cylinder cap by rocking arm framework.
Present invention application advantage is notable, is summarized as follows:
Eliminating former rocker arm shaft, rocker arm shaft assembly and bearing cap, structure is the simplest, compact；
Being integrated with camshaft-bearing cap, rocker arm shaft and assembly, camshaft-bearing cap originally all use an entirety
Rocking arm framework replace；
After cancelling rocker arm shaft, decrease friction loss, make the frictional work loss of electromotor reduce；
Rocker arm shaft and component price are higher, and after being replaced by overall rocking arm framework, cost is obviously reduced；
Rocker arm shaft and assembly are installed more difficult, simultaneously plus the installation of camshaft-bearing cap, assemble more complicated,
And by new rocking arm framework, overall assembling, the most simply, convenient
Below by with accompanying drawing, technical scheme being carried out the most detailed retouching in conjunction with specific embodiments
State.
Accompanying drawing explanation
Fig. 1 is the valve control machanism of overhead camshaft engine of the present invention.
Fig. 2 is Fig. 1 top view.
Fig. 3 is Fig. 2 Section A-A figure.
Fig. 4 is Fig. 2 section B-B figure.
Fig. 5 is Fig. 2 C-C sectional view.
Fig. 6 is rocking arm framework sketch.
In figure: 1, rocking arm framework, 2, rocking arm, 3, rocking arm framework bolt, 4, bolt of bearing cap, 5, convex
Wheel shaft, 6, valve, 7, tappet, 8, cylinder cap, 9, rocking arm fixed mechanism, 10, bayonet socket, 11, cross bar,
12, montant, 13, base.
Detailed description of the invention
Embodiment 1, the present embodiment is the valve control machanism in a kind of four cylinder two valve overhead camshaft engines
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, including on a camshaft 5, camshaft 5 point of row 8
Individual cam, 8 rocking arms 2,8 valves 6, each valves are both provided with valve spring, every rocking arm 2
Press the cam on camshaft 5 and corresponding valve 6 respectively at two ends, and valve spring extruding valve makes valve close,
It addition, also include the rocking arm framework 1 of fixing rocking arm 2；Rocking arm framework 1 as shown in Figure 6, is fixed on cylinder cap 8
On, uniform including substantially parallel with camshaft 5 cross bar 11 and a group 4 be fixed on cylinder cap 8
The montant 12 of distribution, cross bar 11 and all of montant 12 form three portal frames, arrange on the downside of cross bar 11
There are the rocking arm fixed mechanism 9 of 8 fixing rocking arms 2, every cross bar 11 lateral symmetry that one rocking arm is set admittedly
Determining mechanism 9, rocking arm fixed mechanism 9 fixes rocking arm 2 from the centre of rocking arm 2, form one with rocking arm 2 in the middle part of
Fixing point is the swinging structure of fulcrum.Two ends extrude cam and valve 6 respectively.In the present embodiment, rocking arm is fixed
Mechanism 9 includes that being arranged on the fixing rocking arm 2 on the downside of cross bar 11 makes it not along the bayonet socket of cross bar 11 lengthwise movement
10 and control the tappet 7 of rocking arm 2 and the spacing of cross bar 11.Here, rocking arm 2 and the spacing of cross bar 11
From reflection valve clearance, adjust valve clearance and realize by the spacing adjusting rocking arm 2 and cross bar 11,
In order to realize being automatically adjusted of valve clearance, in the present embodiment, tappet 7 is mechanical tappets, long by regulating it
Degree can be with valve gap adjustment, and a kind of simple method is that tappet is designed to screw rod, arranges in cross bar 11
One threaded screwed hole, screwed hole and the spiral shell as tappet are set at the fixed mechanism 9 of fixing rocking arm 1
Screw-threaded engagement on bar, the length stretched out by adjusting screw rod can be with valve gap adjustment.Can also be by tappet
Being set to hollow, inside putting into hydraulic part becomes hydraulic tappet and realizes being automatically adjusted valve clearance.
By can valve gap adjustment effectively to the control of tappet length.In order to reduce between rocking arm 2 and cam
Frictional resistance, increasing on the premise of lubricating oil, rocking arm 2 is connected with described cam by a roller
Touch, replace sliding friction can reduce frictional resistance well with rolling friction.The present embodiment and current top
The valve control machanism putting cam axle engine is compared, it is simply that use a rocking arm framework 1 to replace original
Rocker arm shaft and assembly, rocker arm shaft bearing cap, and it is integrated with camshaft-bearing cap.Rocking arm framework 1 in the present embodiment
The bottom of montant 12 be provided with the base 13 being fixed on cylinder cap 8, be provided with and cam on the downside of base 13
The bearing that axle 5 connects.It addition, rocking arm framework 1 is fixed to described cylinder cap 8 by rocking arm framework bolt 3
On.
The present embodiment is for current overhead camshaft, with the valve arrangement structure of rocker arm shaft, it is provided that a kind of
Novel rocking arm and rocking arm framework replace traditional rocker arm shaft to design, this most integrated cam of rocking arm framework
Axle bearing lid.Purpose is to realize cancelling after rocker arm shaft, reduces the part of electromotor, simultaneously engine scuffing,
Rocking arm arrangement and cost reduce the most accordingly.
During traditional overhead camshaft with rocker arm shaft is arranged, rocking arm consumes relatively in swinging up and down of rocker arm shaft
Many frictional works, and the requirement of rocker arm shaft material and machining accuracy is the highest, also needs to bearing cap simultaneously and consolidates
Fixed, and camshaft designs special camshaft-bearing cap again.Therefore in engine performance and cost all
Unfavorable.The present invention eliminates rocker arm shaft by the design of Novel rocker arm framework, is integrated with camshaft-bearing cap,
Simplify structure, optimize performance and cost.
In technology in the present embodiment:
Mainly include rocking arm, rocking arm framework, tappet and bolt, replace original rocking arm, rocker arm shaft, shake
Arm axle assembly (including fixing spring, fixing spring base etc.), rocker arm shaft bearing cap, camshaft-bearing cap and spiral shell
Bolt；
Rocking arm framework and tappet instead of original rocker arm shaft and assembly, rocker arm shaft bearing cap, and are integrated with convex
Wheel bearing lid；
Tappet is the same with original rocker arm shaft, is arranged in the centre of rocker arm shaft, but tappet is down to press rocking arm,
Playing the effect of fixing support, rocking arm swings up and down under the effect that middle tappet supports and reaches rocking arm driving
The effect of valve；
Tappet is installed on rocking arm framework, and rocking arm framework is integrally attached on cylinder cap by bolt after covering tappet,
Namely the rocking arm framework entirety being cased with tappet is pressed on rocking arm so that it is play the effect supporting rocking arm；
Rocking arm side is roller, promotes the roller in rocking arm to swing up and down, and rocking arm opposite side is valve, gas
Door opens and closes under the driving of rocking arm, it is achieved the function of valve mechanism.
Rocking arm framework is also fully integrated camshaft-bearing cap, is arranged on cylinder cap as a whole framework,
Achieve compact design structure.
Claims (3)
1. a valve control machanism for overhead camshaft engine, including camshaft, rocking arm, valve, gas
Door spring, described rocking arm two ends press the cam on described camshaft and valve, valve spring respectively
Valve described in extruding makes valve close, it is characterised in that: also include the rocking arm of fixing described rocking arm (2)
Framework (1)；Described rocking arm framework (1) is fixed on cylinder cap (8), including substantially putting down with described camshaft
The cross bar (11) gone and the one group of montant (12) being fixed on cylinder cap (8), described cross bar (11) is with all
Montant (12) form one group of portal frame, described cross bar (11) downside is provided with fixing described rocking arm (2)
Rocking arm fixed mechanism (9), the rocking arm that described rocking arm fixed mechanism (9) is fixing described from the centre of rocking arm (2)
(2), composition one is with rocking arm (2) the middle part fixing point swinging structure as fulcrum；
Described rocking arm fixed mechanism (9) includes being arranged on the fixing described of described cross bar (11) downside
Rocking arm (2) make its not along described cross bar (11) lengthwise movement bayonet socket (10) and control described in rocking arm (2)
Tappet (7) with the spacing of cross bar (11)；
Described tappet (7) is length-adjustable mechanical type tappet；
Described tappet (7) is hydraulic tappet；
The bottom of described montant (12) is provided with the base (13) being fixed on described cylinder cap (8), base (13)
Downside is provided with the bearing connected with described camshaft (5).
The valve control machanism of overhead camshaft engine the most according to claim 1, its feature exists
In: described rocking arm (2) is contacted with described cam by a roller.
The valve control machanism of overhead camshaft engine the most according to claim 1, its feature exists
In: described rocking arm framework (1) is fixed on described cylinder cap (8) by rocking arm framework bolt (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110328786.6A CN102383887B (en) | 2011-10-26 | 2011-10-26 | A kind of valve control machanism of overhead camshaft engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110328786.6A CN102383887B (en) | 2011-10-26 | 2011-10-26 | A kind of valve control machanism of overhead camshaft engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102383887A CN102383887A (en) | 2012-03-21 |
| CN102383887B true CN102383887B (en) | 2016-08-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110328786.6A Active CN102383887B (en) | 2011-10-26 | 2011-10-26 | A kind of valve control machanism of overhead camshaft engine |
Country Status (1)
| Country | Link |
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| CN (1) | CN102383887B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103743569A (en) * | 2014-01-22 | 2014-04-23 | 安徽江淮汽车股份有限公司 | Test bed for engine valve system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4724803A (en) * | 1986-05-29 | 1988-02-16 | General Motors Corporation | Rolling contact rocker arm with reaction member, rocker key and roller follower |
| US4913104A (en) * | 1988-11-30 | 1990-04-03 | Henley Manufacturing Corporation | Rocker arm for operating two valves |
| CN2480551Y (en) * | 2001-06-05 | 2002-03-06 | 李新苍 | Swing arm support for overhead cam-axle engine |
| CN1682014A (en) * | 2002-07-18 | 2005-10-12 | 科勒公司 | Cam follower arm for an internal combustion engine |
| CN2756834Y (en) * | 2003-12-03 | 2006-02-08 | 广西玉柴机器股份有限公司 | Four valve diesel engine swing arm assembly |
| CN101900003A (en) * | 2010-07-20 | 2010-12-01 | 奇瑞汽车股份有限公司 | Internal combustion engine distribution mechanism with continuously variable valve stroke and control method thereof |
| CN102022150A (en) * | 2009-09-18 | 2011-04-20 | 重庆隆鑫机车有限公司 | Cam shaft and rocker shaft supporting seat of overhead cam shaft type engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08312318A (en) * | 1995-05-18 | 1996-11-26 | Takashi Hikita | Variable valve timing mechanism |
-
2011
- 2011-10-26 CN CN201110328786.6A patent/CN102383887B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4724803A (en) * | 1986-05-29 | 1988-02-16 | General Motors Corporation | Rolling contact rocker arm with reaction member, rocker key and roller follower |
| US4913104A (en) * | 1988-11-30 | 1990-04-03 | Henley Manufacturing Corporation | Rocker arm for operating two valves |
| CN2480551Y (en) * | 2001-06-05 | 2002-03-06 | 李新苍 | Swing arm support for overhead cam-axle engine |
| CN1682014A (en) * | 2002-07-18 | 2005-10-12 | 科勒公司 | Cam follower arm for an internal combustion engine |
| CN2756834Y (en) * | 2003-12-03 | 2006-02-08 | 广西玉柴机器股份有限公司 | Four valve diesel engine swing arm assembly |
| CN102022150A (en) * | 2009-09-18 | 2011-04-20 | 重庆隆鑫机车有限公司 | Cam shaft and rocker shaft supporting seat of overhead cam shaft type engine |
| CN101900003A (en) * | 2010-07-20 | 2010-12-01 | 奇瑞汽车股份有限公司 | Internal combustion engine distribution mechanism with continuously variable valve stroke and control method thereof |
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| CN102383887A (en) | 2012-03-21 |
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