CN104819022A - Cold start mechanism for engine - Google Patents
Cold start mechanism for engine Download PDFInfo
- Publication number
- CN104819022A CN104819022A CN201510126354.5A CN201510126354A CN104819022A CN 104819022 A CN104819022 A CN 104819022A CN 201510126354 A CN201510126354 A CN 201510126354A CN 104819022 A CN104819022 A CN 104819022A
- Authority
- CN
- China
- Prior art keywords
- piston
- engine
- rocking arm
- valve
- rocker arm
- Prior art date
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
- F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
- F01L1/183—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft of the boat type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L2001/187—Clips, e.g. for retaining rocker arm on pivot
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
A cold start mechanism for an engine comprises a piston and a spring which are integrated in a rocker arm of the engine. A piston has a non-operation position and an operation position in a piston hole in the rocker arm, and the spring and fluid enable the piston to move between the operation position and the non-operation position. At the operation position, the part, in the piston hole of the rocker arm, of the piston enters an annular groove in a rocker arm shaft, and the rocker arm and the rocker arm shaft are in mechanical connection; the rocker arm is prevented from rotating on the rocker arm shaft, and an air valve of the engine is made not to fall and to be kept open. At the non-operation position, the piston in the rocker arm and the rocker arm shaft are disengaged, no effect is achieved, the rocker arm can rotate freely on the rocker arm shaft, and the air valve of the engine returns to be in a normal working state. According to the cold start mechanism for the engine, the simple and reliable mechanism and the novel and unique design are adopted, and the air valve of the engine is kept open when the engine flames out or stops or starts, so that the performance, particular the stopping, starting and idling performance, of the engine is improved, and the oil consumption and emission of the engine are reduced.
Description
Technical field:
The present invention relates to mechanical field, particularly relate to vehicle startup machine technology, particularly a kind of engine cold-start mechanism.
Background technique:
The performance of motor comprises conventional ignition performance and other ilities, the braking ability of such as motor, the parking of motor, startability and idle running performance etc.Although the hardware and software of motor is all significantly improved, such as motor adopts the new technologies such as heating when cold start-up, and at arctic weather, compression-ignited diesel engine is still difficult to start.Also there is idling and the defects such as excessive fuel consumption, shakiness, vibrations and noise that operate when stopping in large commercial car engine.The auxiliary valve driving mechanism being used for improving engine performance is at present mostly hydraulic type mechanism.After engine misses, the valve of motor cannot stay open by hydraulic type mechanism.The leakage of fluid (as machine oil) will cause the inefficacy of hydraulic type mechanism, because cannot to hydraulic type mechanism fuel feeding after engine misses, the fluid of leakage can not get supplementing, thus loses hydraulic connecting, and the engine air goalkeeper opened by fluid is taken a seat closedown under the effect of valve spring.
Summary of the invention:
The object of the present invention is to provide a kind of engine cold-start mechanism, oil consumption large, vibrations and noise is large and engine cold-start is difficult technical problem when stopping when described this engine cold-start mechanism will solve engine idling operation in prior art, and the technical problem that the valve of motor cannot stay open by hydraulic type mechanism after engine misses.
This engine cold-start mechanism of the present invention, comprise the rocking arm of motor, be arranged on a pitman arm shaft described rocking arm rotary type, fluid passage is provided with in described pitman arm shaft, wherein, a piston hole is provided with in described rocking arm, described pitman arm shaft is provided with an annular groove, annular groove is communicated with described fluid passage, a piston is provided with in described piston hole, described piston has an off position and an operating position in piston hole, a spring is provided with between piston and rocking arm, one end of piston is biased to described operating position by described spring, the fluid thrust in fluid passage is utilized to realize one end of piston from operating position to the switching of described off position, when piston is positioned at operating position, one end of piston enters annular groove, piston forms mechanical linkages between rocking arm and pitman arm shaft, stop the revolution of rocking arm on pitman arm shaft, the valve of the motor that one end is connected stays open, when piston is positioned at off position, piston departs from pitman arm shaft and annular groove, free revolute pair is formed between rocking arm and pitman arm shaft, the valve of the motor that one end connects operates in the usual way.
Further, the active force of described spring on piston and the fluid in the fluid passage active force on piston has contrary direction, when the active force of spring is greater than the active force of fluid, piston shifts to operating position from off position in piston hole, when the active force of fluid is greater than the active force of spring, piston shifts to off position from operating position in piston hole.
Further, the lift that engine valve stays open is less than the lift of conventional valve, and is less than 3mm.
Further, the hydrodynamic pressure in described fluid passage is less than 1.0 bar.
Further, the other end of rocking arm is connected with the push rod of a motor, is provided with and prevents flying off spring mechanism between rocking arm and described push rod.
Further, rocking arm is provided with an auxiliary valve clearance controlling mechanism, the relative position in the auxiliary valve clearance controlling mechanism adjusting rock arm described in utilization between cold start-up mechanism and engine valve.
The present invention compares with prior art, and its effect is actively with obvious.The present invention utilizes and is arranged on the piston in rocking arm and the annular groove on pitman arm shaft to limit the revolution of rocking arm on pitman arm shaft; rocking arm can form mechanical linkages by piston between pitman arm shaft and engine valve; stop revolving rocker arm; the engine valve after opening can not be closed; and when reaching the engine speed (comprising zero rotating speed) of needs; engine valve is stayed open, thus the reduction resistance of engine cylinder piston and the moment of torsion of motor, improve the performance of motor.After engine stop with in follow-up engine starting process; piston is sustainable to be stayed open engine valve; eliminate cylinder pressure; reduce starting torque; improve the idling of motor, parking and startability, can also by reducing the idling of motor, what adopt motor closes cylinder (stopping oil spout) or means such as parking completely; reduce oil consumption, reduce discharge.
Accompanying drawing illustrates:
Fig. 1 is first embodiment of a kind of engine cold-start mechanism of the present invention schematic diagram when being in off position.
Fig. 2 is first embodiment of a kind of engine cold-start mechanism of the present invention schematic diagram when being in operating position.
Embodiment:
Embodiment 1:
As depicted in figs. 1 and 2, routine (master) valve actuator 200 of motor comprises cam 230, tappet roller 235, push rod 201, rocking arm 210, pitman arm shaft 205 and valve clearance regulating system.Be arranged on pitman arm shaft 205 rocking arm 210 rotary type.The side of rocking arm 210 is by conventional valve clearance regulating system (comprise adjusting screw 110 and tighten up nut 105) and to resemble foot pad 114 connected with the valve 300 (Fig. 1 and Fig. 2 illustrate only a valve, but the present embodiment can have plural valve) of motor.Valve 300 is biased on the valve seat 320 of engine cylinder-body 500 by the valve spring 310 of motor, stops gas to flow between engine cylinder and outlet pipe 600.The other end of rocking arm 210 is connected with cam 230 with roller 235 with push rod 201 by auxiliary valve clearance regulating system, and cam 230 has conventional boss 220 on interior basic circle 225.Cam 230 move through push rod 201, rocking arm 210, pass to valve 300, make it periodically open and close.Auxiliary valve clearance regulating system comprises adjusting screw 1102 and tightens up nut 1052, can regulate the gap (relative position) between cold start-up mechanism 100 and engine valve 300.Cold start-up mechanism 100 comprises piston 160 and spring 156.Piston 160 is placed in the piston hole 190 in the rocking arm 210 of motor.Be provided with fluid passage 211 and annular groove 260 in pitman arm shaft 205, annular groove 260 is communicated with fluid passage 212.
When motor normal operation, the piston 160 in cold start-up mechanism 100 is in the off position shown in Fig. 1.Fluid (as machine oil) flows to piston 160 from the fluid passage 211 in pitman arm shaft 205.Oil pressure is greater than the active force of piston upper spring 156, piston 160 is pressed in off position as shown in Figure 1, throws off (without active force) with pitman arm shaft 205, and rocking arm 210 freely can rotate on pitman arm shaft 205.The rocking arm 210(that moves through of cam 230 comprises valve clearance regulating system), pass to valve 300, produce routine (master) valve motion of motor.Without any interaction between cold start-up mechanism 100 now and valve 300, with the running of motor without any relation, the valve 300 of motor keeps its original working state.
When it is shut off, or pass through control mechanism, the engine oil pressure of motor is declined.To drop to a certain degree or before dropping to zero (be less than 1.0 bar, such as before tail-off), piston 160 pushes operating position (active force of spring is contrary with the direction of hydrodynamic pressure (as engine oil pressure)) under the effect of spring 156 at oil pressure.Before piston 160 can be switched to operating position from off position, before namely entering the annular groove 260 on pitman arm shaft 205, valve 300 is pushed open downwards by routine (master) valve actuator 200 of motor, rocking arm 210 does inhour together with the piston 160 of its inside and rotates (notice pitman arm shaft 205 on the engine face be actionless) on pitman arm shaft 205, when piston 160 is exposed to the annular groove 260 above pitman arm shaft 205 completely, it is just down stretched, the operating position that the lower part of piston 160 enters the annular groove 260 on pitman arm shaft 205 and enters as shown in Figure 2.Return in the process at its seat 320 after valve 300 is opened completely by cam 230; rocking arm 210 does clockwise revolution on pitman arm shaft 205; piston 160 entered in annular groove 260 will rest in the right side of annular groove 260; between rocking arm 210 and pitman arm shaft 205, form mechanical linkages; stop rocking arm 210 further revolution clockwise; make the valve 300 after being opened by conventional (master) valve actuator 200 cannot get back to its seat 320 and keep often opening; its opening amount or lift 234 are less than 3mm, much smaller than conventional (master) valve lift.Active force on engine valve 300, the mechanical linkages formed by rocking arm 210, piston 160 and pitman arm shaft 205 etc., passes to motor.Obviously, mechanical linkages of the present invention is the connection (Gu chain type) between solid and solid, is diverse, without any leakage with the hydraulic connecting by fluid bearings.
After engine shut down, engine valve 300 keep opening amount be 234 normally open constant.Because rocking arm 210 is blocked by the piston 160 of the annular groove 260 be positioned on pitman arm shaft 205, can not original position be got back to when cam 230 goes back to basic circle 225, certain gap will be produced between rocking arm 210 and push rod 201.In order to prevent this gap from producing flying off of valve actuating mechanism parts, being provided with between rocking arm 210 and push rod 201 and preventing flying off spring 198.
Before motor is shut down, after shutdown and when again starting, engine valve 300 is all in and keeps opening amount to be the normally open of 234, greatly reduces cylinder pressure and the moment of torsion of motor; improve engine cut-off and startability; and can reduce idle, reduce oil consumption, reduce discharge.
Above-mentioned explanation contains a kind of concrete mode of execution, and this should not be regarded as limitation of the scope of the invention, but a representatively concrete illustration of the present invention, other differentiation many all likely therefrom produce.For example, the engine cold-start mechanism shown here, not only may be used for push rod engine, also can be used for overhead camshaft type engine; Not only can be used for driving exhaust valve, also can be used to drive intake valve; Not only may be used for a valve, also may be used for plural valve, open two valves as by a valve bridge, and the opening amount of valve also can be different.
In addition, engine valve can be selected as required by the number of cylinders that cold start-up mechanism stays open.Sometimes not necessarily need to keep all cylinders all to open, and just keep the engine valve of some cylinder by cold start-up mechanism opening, the engine valve of all the other cylinders keeps original working state, the impact of starting mechanism of not catching a cold.
Further, the shape of the piston (being also plunger) shown here and its control changed between off position and operating position can be diversified, and the position of piston in rocking arm and mounting type also can be different.The spring force of driven plunger and hydrodynamic pressure can adjust as required.
Therefore, scope of the present invention should not decided by above-mentioned concrete illustration, but is decided by affiliated claim and the suitable right of law thereof.
Claims (6)
1. an engine cold-start mechanism, comprise the rocking arm of motor, be arranged on a pitman arm shaft described rocking arm rotary type, fluid passage is provided with in described pitman arm shaft, it is characterized in that: in described rocking arm, be provided with a piston hole, described pitman arm shaft is provided with an annular groove, annular groove is communicated with described fluid passage, a piston is provided with in described piston hole, described piston has an off position and an operating position in piston hole, a spring is provided with between piston and rocking arm, one end of piston is biased to described operating position by described spring, the fluid thrust in fluid passage is utilized to realize one end of piston from operating position to the switching of described off position, when piston is positioned at operating position, one end of piston enters annular groove, piston forms mechanical linkages between rocking arm and pitman arm shaft, stop the revolution of rocking arm on pitman arm shaft, the valve of the motor that one end is connected stays open, when piston is positioned at off position, piston departs from pitman arm shaft and annular groove, free revolute pair is formed between rocking arm and pitman arm shaft, the valve of the motor that one end connects operates in the usual way.
2. engine cold-start mechanism as claimed in claim 1, it is characterized in that: the active force of described spring on piston and the fluid in the fluid passage active force on piston has contrary direction, when the active force of spring is greater than the active force of fluid, piston shifts to operating position from off position in piston hole, when the active force of fluid is greater than the active force of spring, piston shifts to off position from operating position in piston hole.
3. engine cold-start mechanism as claimed in claim 1, is characterized in that: the lift that engine valve stays open is less than the lift of conventional valve, and is less than 3mm.
4. engine cold-start mechanism as claimed in claim 1, is characterized in that: the hydrodynamic pressure in described fluid passage is less than 1.0 bar.
5. engine cold-start mechanism as claimed in claim 1, is characterized in that: the other end of rocking arm is connected with the push rod of a motor, is provided with and prevents flying off spring mechanism between rocking arm and described push rod.
6. engine cold-start mechanism as claimed in claim 1, is characterized in that: rocking arm is provided with an auxiliary valve clearance controlling mechanism, the relative position in the auxiliary valve clearance controlling mechanism adjusting rock arm described in utilization between cold start-up mechanism and engine valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510126354.5A CN104819022B (en) | 2015-03-23 | 2015-03-23 | Cold starting mechanism of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510126354.5A CN104819022B (en) | 2015-03-23 | 2015-03-23 | Cold starting mechanism of engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104819022A true CN104819022A (en) | 2015-08-05 |
| CN104819022B CN104819022B (en) | 2023-09-05 |
Family
ID=53729471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510126354.5A Active CN104819022B (en) | 2015-03-23 | 2015-03-23 | Cold starting mechanism of engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104819022B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177703A (en) * | 2020-12-02 | 2021-01-05 | 江苏卓联精密机械有限公司 | Self-resetting single-valve main and auxiliary piston hydraulic driving device and method for push rod engine |
| CN113404565A (en) * | 2021-07-14 | 2021-09-17 | 潍柴动力股份有限公司 | Valve rocker arm assembly, variable gas distribution structure and engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177703A (en) * | 2020-12-02 | 2021-01-05 | 江苏卓联精密机械有限公司 | Self-resetting single-valve main and auxiliary piston hydraulic driving device and method for push rod engine |
| CN113404565A (en) * | 2021-07-14 | 2021-09-17 | 潍柴动力股份有限公司 | Valve rocker arm assembly, variable gas distribution structure and engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104819022B (en) | 2023-09-05 |
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Address after: 201415 No. 1133 Juting Road, Fengxian District, Shanghai Applicant after: Shanghai Youshun Automobile Technology Co.,Ltd. Address before: 201415 No. 1133 Juting Road, Fengxian District, Shanghai Applicant before: Shanghai Universoon Autoparts Co.,Ltd. |
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