CN104819022B - Cold starting mechanism of engine - Google Patents

Cold starting mechanism of engine Download PDF

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Publication number
CN104819022B
CN104819022B CN201510126354.5A CN201510126354A CN104819022B CN 104819022 B CN104819022 B CN 104819022B CN 201510126354 A CN201510126354 A CN 201510126354A CN 104819022 B CN104819022 B CN 104819022B
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CN
China
Prior art keywords
piston
rocker arm
engine
operation position
valve
Prior art date
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Application number
CN201510126354.5A
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Chinese (zh)
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CN104819022A (en
Inventor
杨洲
奚勇
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Shanghai Youshun Automobile Technology Co ltd
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Shanghai Youshun Automobile Technology Co ltd
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Priority to CN201510126354.5A priority Critical patent/CN104819022B/en
Publication of CN104819022A publication Critical patent/CN104819022A/en
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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
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

An engine cold start mechanism comprising a piston integrated within a rocker arm of an engine, the piston having a non-operating position and an operating position within a piston bore in the rocker arm, the spring and fluid moving the piston between the operating position and the non-operating position, in the operating position a portion of the piston within the piston bore in the rocker arm entering a ring groove on a rocker arm shaft, a mechanical link being formed between the rocker arm and the rocker arm shaft preventing the rocker arm from swinging on the rocker arm shaft such that a valve of the engine cannot be seated and remains open; in the non-operating position, the pistons in the rocker arms are disengaged from the rocker arm shafts and the rocker arms are free to rotate on the rocker arm shafts, and the engine valves return to a normal operating condition. The invention adopts a simple and reliable mechanism and novel and unique design, keeps the valve of the engine open when the engine is flameout, stopped or started, improves the performance of the engine, particularly the stopping, starting and idling performance of the engine, and reduces the oil consumption and the emission of the engine.

Description

Cold starting mechanism of engine
Technical field:
the invention relates to the field of machinery, in particular to vehicle engine technology, and particularly relates to an engine cold start mechanism.
The background technology is as follows:
the performance of the engine includes conventional ignition performance and other auxiliary performance such as braking performance of the engine, stopping performance of the engine, starting performance, idling performance, and the like. Although the hardware and software of the engine are improved greatly, such as the engine adopts new technologies of heating during cold start, the compression ignition diesel engine is difficult to start in cold weather. Large commercial vehicle engines also have the disadvantages of oil consumption, instability, vibration, noise, etc. during idling and stopping. The auxiliary valve actuation mechanisms currently used to improve engine performance are mostly hydraulic mechanisms. After the engine stalls, the hydraulic mechanism cannot hold the engine's valve open. Leakage of fluid (e.g., oil) will cause failure of the hydraulic mechanism because the hydraulic mechanism cannot be supplied after the engine stalls, the lost fluid is not replenished, and thus the hydraulic connection is lost, and the engine valve opened by the fluid will seat closed under the action of the valve spring.
The invention comprises the following steps:
the invention aims to provide an engine cold starting mechanism which aims to solve the technical problems that in the prior art, the engine is large in oil consumption during idle operation, large in vibration and noise during stopping and difficult in cold starting, and a hydraulic mechanism cannot keep an air valve of an engine open after the engine is flameout.
The engine cold starting mechanism comprises a rocker arm of an engine, wherein the rocker arm is rotatably arranged on a rocker arm shaft, a fluid channel is arranged in the rocker arm shaft, a piston hole is arranged in the rocker arm shaft, a ring groove is arranged on the rocker arm shaft and communicated with the fluid channel, a piston is arranged in the piston hole, the piston is provided with a non-operation position and an operation position in the piston hole, a spring is arranged between the piston and the rocker arm, one end of the piston is biased towards the operation position by the spring, one end of the piston is switched from the operation position to the non-operation position by utilizing fluid thrust in the fluid channel, one end of the piston enters the ring groove when the piston is positioned in the operation position, the piston forms a mechanical link between the rocker arm and the rocker arm shaft, the rocker arm is prevented from swinging on the rocker arm shaft, the valve of the engine connected with one end of the rocker arm is kept open, the piston is separated from the rocker arm shaft and the ring groove when the piston is positioned in the non-operation position, one end of the piston is connected with the rocker arm shaft, and the valve of the engine is connected with one end of the rocker arm in the free rotation side is free, and the valve of the engine is operated in a conventional mode.
Further, the force of the spring on the piston and the force of the fluid in the fluid passage on the piston have opposite directions, when the force of the spring is greater than the force of the fluid, the piston moves from the non-operating position to the operating position in the piston bore, and when the force of the fluid is greater than the force of the spring, the piston moves from the operating position to the non-operating position in the piston bore.
Further, the lift of the engine valve remaining open is less than the lift of a conventional valve and less than 3mm.
Further, the fluid pressure in the fluid passage is less than 1.0 bar.
Further, the other end of the rocker arm is connected with a push rod of an engine, and an anti-fly-off spring mechanism is arranged between the rocker arm and the push rod.
Further, an auxiliary valve clearance adjusting mechanism is arranged on the rocker arm, and the relative position between the cold starting mechanism in the rocker arm and the engine valve is adjusted by the aid of the auxiliary valve clearance adjusting mechanism.
Compared with the prior art, the invention has positive and obvious effect. The invention uses the piston in the rocker arm and the ring groove on the rocker arm shaft to limit the rotation of the rocker arm on the rocker arm shaft, the rocker arm can form a mechanical link between the rocker arm shaft and the engine valve through the piston to prevent the rocker arm from rotating, so that the opened engine valve can not be closed, and the engine valve is kept open when the required engine rotating speed (including zero rotating speed) is reached, thereby reducing the resistance of the engine cylinder piston and the torque of the engine, and improving the performance of the engine. After the engine is stopped and in the subsequent engine starting process, the piston can continuously keep the engine valve open, so that the cylinder pressure is eliminated, the starting torque is reduced, the idling, stopping and starting performance of the engine are improved, and the fuel consumption and the emission are reduced by reducing the idling of the engine and adopting the means of closing the cylinder (stopping fuel injection) or completely stopping the engine.
Description of the drawings:
FIG. 1 is a schematic illustration of a first embodiment of an engine cold start mechanism of the present invention in a non-operating position.
FIG. 2 is a schematic illustration of a first embodiment of an engine cold start mechanism of the present invention in an operating position.
The specific embodiment is as follows:
example 1:
as shown in fig. 1 and 2, a conventional (main) valve actuator 200 of an engine includes a cam 230, a cam roller 235, a push rod 201, a rocker arm 210, a rocker shaft 205, and a valve lash adjustment system. The rocker arm 210 is rotatably disposed on the rocker shaft 205. One side of the rocker arm 210 is connected to the engine valve 300 (only one valve is shown in fig. 1 and 2, but there may be more than two valves in this embodiment) by a conventional lash adjustment system (including the adjustment screw 110 and the clamping nut 105) and the like foot pad 114. The valve 300 is biased against a valve seat 320 of the engine block 500 by a valve spring 310 of the engine, preventing gas flow between the engine cylinder and an exhaust pipe 600. The other end of the rocker arm 210 is connected to a cam 230 via an auxiliary lash adjustment system and a pushrod 201 and roller 235, the cam 230 having a conventional boss 220 on an inner base circle 225. The movement of the cam 230 is transmitted to the valve 300 through the push rod 201 and the rocker arm 210, so that it is periodically opened and closed. The auxiliary valve lash adjustment system includes an adjustment screw 1102 and a tightening nut 1052 that allow adjustment of the lash (relative position) between the cold start mechanism 100 and the engine valve 300. The cold start mechanism 100 includes a piston 160 and a spring 156. The piston 160 is disposed within a piston bore 190 in a rocker arm 210 of the engine. The rocker shaft 205 has a fluid passage 211 and a ring groove 260 disposed therein, the ring groove 260 communicating with the fluid passage 212.
During normal engine operation, the piston 160 in the cold start mechanism 100 is in the non-operating position shown in FIG. 1. Fluid (e.g., oil) flows from the fluid passage 211 in the rocker shaft 205 to the piston 160. The oil pressure is greater than the force of the spring 156 on the piston, which presses the piston 160 into the non-operating position shown in fig. 1, out of engagement (no force) with the rocker shaft 205, and the rocker arm 210 is free to rotate on the rocker shaft 205. The motion of the cam 230 is transmitted to the valve 300 through the rocker arm 210 (including the lash adjustment system) to produce conventional (main) valve motion of the engine. At this time, the cold start mechanism 100 and the valve 300 do not have any interaction, and there is no relation with the operation of the engine, and the valve 300 of the engine maintains its original working state.
When the engine is turned off, or by a control mechanism, the engine oil pressure of the engine is lowered. Before the oil pressure drops to some extent or to zero (less than 1.0 bar, say before the engine is shut down), the piston 160 is pushed towards the operating position by the spring 156 (the force of the spring is opposite to the direction of the fluid pressure, such as the oil pressure). Before the piston 160 can be switched from the non-operating position to the operating position, i.e., into the ring groove 260 on the rocker shaft 205, the conventional (main) valve actuator 200 of the engine pushes the valve 300 downward, the rocker arm 210 with its internal piston 160 rotates counter-clockwise on the rocker shaft 205 (note that the rocker shaft 205 is stationary on the engine), and when the piston 160 is fully exposed to the ring groove 260 on the rocker shaft 205, it extends downward, the lower portion of the piston 160 enters the ring groove 260 on the rocker shaft 205 to the operating position shown in fig. 2. During return of the valve 300 to its seat 320 after being fully opened by the cam 230, the rocker arm 210 will rotate clockwise on the rocker shaft 205 and the piston 160 entering the ring groove 260 will rest on the right side of the ring groove 260, creating a mechanical link between the rocker arm 210 and the rocker shaft 205 preventing further clockwise rotation of the rocker arm 210 such that the valve 300 after being opened by the conventional (main) valve actuator 200 cannot return to its seat 320 and remains normally open with an opening or lift 234 of less than 3mm, which is much less than the conventional (main) valve lift. The force on the engine valve 300 is transferred to the engine through a mechanical link formed by the rocker arm 210, piston 160, rocker shaft 205, etc. It is clear that the mechanical link of the invention is a solid-to-solid connection (solid-chain), as opposed to a hydraulic connection carried by a fluid, without any leakage.
After the engine is stopped, the engine valve 300 remains in a normally open state with an opening amount of 234. Because the rocker arm 210 is retained by the piston 160 in the ring groove 260 on the rocker shaft 205, the inability to return to its original position when the cam 230 is rotated back into the base circle 225 will create a gap between the rocker arm 210 and the pushrod 201. In order to prevent the valve drive mechanism member from coming off in this gap, a drop-off prevention spring 198 is provided between the rocker arm 210 and the push rod 201.
Before, after and during restarting the engine is stopped, the engine valve 300 is in a normally open state with the opening amount of 234, so that the cylinder pressure and torque of the engine are greatly reduced, the stopping and starting performance of the engine is improved, the idle running can be reduced, the oil consumption is reduced, and the emission is reduced.
The above description contains a specific embodiment which should not be construed as limiting the scope of the invention but as merely representative of one particular illustration of the invention from which many other variations are possible. For example, the engine cold start mechanism shown herein may be used not only with a push rod engine, but also with an overhead cam engine; the device can be used for driving the exhaust valve and the intake valve; the valve can be used for not only one valve but also more than two valves, for example, two valves are opened through one valve bridge, and the opening amounts of the valves can be different.
Further, the number of cylinders in which the engine valves are held open by the cold start mechanism may be selected as desired. It is sometimes not necessary to keep all cylinders open, but only to keep the engine valves of some cylinders open by the cold start mechanism, and the engine valves of the remaining cylinders remain in the original working state, unaffected by the cold start mechanism.
Also, the shape of the piston (also called plunger) shown here and its control of the transition between the non-operating position and the operating position may be varied, as may the position and manner of mounting of the piston in the rocker arm. The spring force and fluid pressure of the drive piston can be adjusted as desired.
Accordingly, the scope of the invention should be determined not by the specific examples above, but by the appended claims and their legal equivalents.

Claims (4)

1. The utility model provides an engine cold start mechanism, includes the rocking arm of engine, rocking arm rotationally set up on a rocking arm axle, the rocking arm inboard be provided with fluid channel, its characterized in that: the rocker arm is internally provided with a piston hole, the rocker arm shaft is provided with a ring groove, the ring groove is communicated with the fluid channel, the piston hole is internally provided with a piston, the piston is provided with a non-operation position and an operation position in the piston hole, a spring is arranged between the piston and the rocker arm, the spring biases one end of the piston towards the operation position, the fluid thrust in the fluid channel is utilized to realize the switching of one end of the piston from the operation position to the non-operation position, when the piston is positioned at the operation position, one end of the piston enters the ring groove, the piston forms a mechanical link between the rocker arm and the rocker arm shaft, the rotation of the rocker arm on the rocker arm shaft is prevented, the valve of an engine connected with one end of the rocker arm is kept open, when the piston is positioned at the non-operation position, the piston is separated from the rocker arm shaft and the ring groove, the valve of the engine connected with one end of the rocker arm forms a free rotation auxiliary device, the acting force of the spring on the piston and the acting force of the fluid channel on the piston are in opposite directions, when the acting force of the spring is larger than the acting force of the fluid on the piston, when the acting force of the piston is moved from the operation position to the non-operation position, the acting force of the piston is kept smaller than the acting force in the normal direction when the valve is moved from the operation position to the operation position, and is kept smaller than the normal acting force is 3mm, and when the acting force is kept from the operation position is smaller than the normal acting force is.
2. The engine cold start mechanism of claim 1, wherein: the fluid pressure in the fluid channel is less than 1.0 bar.
3. The engine cold start mechanism of claim 1, wherein: the other end of the rocker arm is connected with a push rod of an engine, and an anti-fly-off spring mechanism is arranged between the rocker arm and the push rod.
4. The engine cold start mechanism of claim 1, wherein: the rocker arm is provided with an auxiliary valve clearance adjusting mechanism, and the relative position between the cold starting mechanism and the engine valve in the rocker arm is adjusted by using the auxiliary valve clearance adjusting mechanism.
CN201510126354.5A 2015-03-23 2015-03-23 Cold starting mechanism of engine Active CN104819022B (en)

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Application Number Priority Date Filing Date Title
CN201510126354.5A CN104819022B (en) 2015-03-23 2015-03-23 Cold starting mechanism of engine

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Application Number Priority Date Filing Date Title
CN201510126354.5A CN104819022B (en) 2015-03-23 2015-03-23 Cold starting mechanism of engine

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112177703B (en) * 2020-12-02 2021-02-12 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
CN113404565B (en) * 2021-07-14 2022-06-28 潍柴动力股份有限公司 Valve rocker assembly, variable distribution structure and engine

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US6347606B1 (en) * 1999-12-28 2002-02-19 Honda Giken Kogyo Kabushiki Kaisha Valve operating system in internal combustion engine
EP1493902A1 (en) * 2003-06-30 2005-01-05 Ford Global Technologies, LLC, A subsidary of Ford Motor Company Device for switching off a valve
JP2006177165A (en) * 2004-12-20 2006-07-06 Mitsubishi Motors Corp Valve gear of internal combustion engine
JP2007262979A (en) * 2006-03-28 2007-10-11 Mitsubishi Motors Corp Variable valve gear of internal combustion engine
JP2008202513A (en) * 2007-02-20 2008-09-04 Mitsubishi Motors Corp Variable valve mechanism
CN102235202A (en) * 2010-05-05 2011-11-09 上海尤顺汽车部件有限公司 Brake positioning control method and positioning mechanism for engine
CN202611787U (en) * 2012-05-09 2012-12-19 上海尤顺汽车部件有限公司 Fixed-chain-type special rocker arm brake device

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CN1180784A (en) * 1996-09-02 1998-05-06 本田技研工业株式会社 Valve operating system in internal combustion engine
US6347606B1 (en) * 1999-12-28 2002-02-19 Honda Giken Kogyo Kabushiki Kaisha Valve operating system in internal combustion engine
EP1493902A1 (en) * 2003-06-30 2005-01-05 Ford Global Technologies, LLC, A subsidary of Ford Motor Company Device for switching off a valve
JP2006177165A (en) * 2004-12-20 2006-07-06 Mitsubishi Motors Corp Valve gear of internal combustion engine
JP2007262979A (en) * 2006-03-28 2007-10-11 Mitsubishi Motors Corp Variable valve gear of internal combustion engine
JP2008202513A (en) * 2007-02-20 2008-09-04 Mitsubishi Motors Corp Variable valve mechanism
CN102235202A (en) * 2010-05-05 2011-11-09 上海尤顺汽车部件有限公司 Brake positioning control method and positioning mechanism for engine
CN202611787U (en) * 2012-05-09 2012-12-19 上海尤顺汽车部件有限公司 Fixed-chain-type special rocker arm brake device

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