CN102493877A - Diesel engine exhaust braking device for heavy-duty vehicle - Google Patents
Diesel engine exhaust braking device for heavy-duty vehicle Download PDFInfo
- Publication number
- CN102493877A CN102493877A CN2011103659125A CN201110365912A CN102493877A CN 102493877 A CN102493877 A CN 102493877A CN 2011103659125 A CN2011103659125 A CN 2011103659125A CN 201110365912 A CN201110365912 A CN 201110365912A CN 102493877 A CN102493877 A CN 102493877A
- Authority
- CN
- China
- Prior art keywords
- piston
- diesel engine
- exhaust
- exhaust valve
- oil
- 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.)
- Pending
Links
Images
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention discloses a diesel engine exhaust braking device. A piston sleeve is arranged in an exhaust valve bridge frame; a piston can vertically move on the piston sleeve; the lower end of the piston sleeve is provided with a limiting snap ring; the piston sleeve is provided with an oil chamber and corresponding oil charging hole and oil discharging hole; and a one-way valve is arranged in the oil charging hole. A spring is arranged in an inner cavity at the back of the piston, and the upper end of the oil chamber is arranged in a cylinder cover with an oil duct and exhaust holes. A rocker arm drives the exhaust valve bridge frame according to different stroke stages of a diesel engine so as to control an exhaust valve under the piston to open and close. The diesel engine exhaust braking device is matched with a throttle valve of the diesel engine, the exhaust valve keeps open a little at the stroke needing stage, and gas pressure in an air cylinder is controlled, so that the rotating speed of the diesel engine and the speed of a finished automobile can be effectively reduced to achieve the aim of braking. By using the diesel engine exhaust braking device, low speed can be kept when a vehicle goes down a slope for a long time, abrasion of a brake and tyres of a vehicle is effectively reduced on the basis of reducing driving brakes, and meanwhile, the fatigue strength of a driver in driving is relieved.
Description
Technical field
The invention belongs to engine braking apparatus, be specifically related to a kind of heavy goods vehicles and use the diesel exhaust gas braking device.
Background technique
At present, the tonnage of long-distance vehicle is increasingly high, so fully loaded vehicle braked system is just had higher requirement.The braking method of general vehicle mainly is that a throttle valve (for example fly valve) is installed on exhaust manifold; When the needs exhaust brake, utilize throttle valve that total air escape pipe is blocked, make diesel engine be equivalent to compressor operating; To absorb the vehicle movement energy, reach the braking purpose.But for the large-tonnage diesel-oil vehicle, the method that just relies on throttle valve that outlet pipe is blocked can not fully be taken away the energy that motor and car load inertia are possessed, so retardation efficiency is lower.In order to remedy this defective, the present invention designs the system that a cover is made up of oil circuit and gas exhaust piping on exhaust valve, utilizes the difficult compressibility of machine oil, and the pressure surge of waste gas reaches the purpose that improves retardation efficiency.The present invention has made full use of the energy of exhaust, takes away lot of energy at air inlet, compression, expansion stroke through gas throttling, improves exhaust brake efficient.
Summary of the invention
The objective of the invention is, provide a kind of heavy goods vehicles to use the diesel exhaust gas braking device.
Below in conjunction with accompanying drawing know-why of the present invention and scheme are described.The diesel engine for automobile exhaust braking comprises: exhaust valve crane span structure, piston sleeve, piston, spacing snap ring, oil pocket, oil inlet hole, draining hole, one-way valve, spring, exhaust valve etc.In the exhaust valve crane span structure, be provided with a piston sleeve, piston can move up and down at piston sleeve.Spacing snap ring is equipped with in the lower end of piston sleeve, and piston sleeve is provided with oil pocket and corresponding oil inlet hole and draining hole, and oil inlet hole is equipped with one-way valve.In the inner chamber of the piston back side spring being housed, packs into and has in the cylinder head cover of oil duct and exhaust port in the oil pocket upper end.Rocking arm drives the valve crane span structure according to the different stroke stage of diesel engine, thus the folding of exhaust valve below the control piston.
The exhaust braking working principle is: in the exhaust valve crane span structure, be provided with one by the power-actuated piston of lubrication pressure; Move up and down the aperture of control exhaust valve through the mobile position driven plunger of control valve crane span structure; Through reducing gas pressure in the cylinder, make the rotating speed decline of diesel engine reach the braking purpose.Because in the diesel exhaust gas stroke stage, crack if exhaust valve keeps, receive throttling when then gas stream is crossed exhaust valve, the compression work that makes gas in the cylinder reduces diesel engine speed thus greater than expansion work, thereby reduces the car load speed of a motor vehicle, reaches the braking purpose.
The beneficial effect of characteristics of the present invention and generation is: vehicle helps to reduce and keeps the low speed of a motor vehicle when long-time descending; It is guaranteed in the travelling speed scope of a safety; And can reduce use to Service Brake; Effectively reduce vehicle brake and Tyte Wear, also alleviated the fatigue strength of driver's operation simultaneously.The present invention is simple in structure, and is cheap for manufacturing cost, suitable applying.
Description of drawings
Shown in accompanying drawing be the structure principle chart of diesel engine braking device when exhaust stroke.
Embodiment
Below in conjunction with accompanying drawing and through embodiment structure of the present invention is further described.Present embodiment is narrative, rather than determinate, does not limit protection scope of the present invention with this embodiment.
Diesel engine for automobile exhaust braking (as shown in the figure), its structure is: in exhaust valve crane span structure 1, be provided with a piston sleeve 2, piston 3 can move up and down at piston sleeve.Spacing snap ring 4 is equipped with in the lower end of piston sleeve 2, and piston sleeve is provided with oil pocket 5 and corresponding oil inlet hole 6 and draining hole 7.Oil inlet hole is equipped with one-way valve 8, in the inner chamber of the piston back side spring 9 is housed.Pack into and have in the cylinder head cover 12 of oil duct 10 and exhaust port 11 in the oil pocket upper end, rocking arm 13 drives exhaust valve crane span structures 1 according to four stroke stages of diesel engine, thus the folding of exhaust valve 14 below the control piston.Mobile position through control valve crane span structure 1 is by the aperture of piston 3 control exhaust valves 14, through reducing gas pressure in the cylinder, the rotating speed of diesel engine descended reach the braking purpose.
The general every cylinder of diesel engine has two outlet valves.They can be driven by exhaust valve crane span structure and rocking arm.Exhaust valve rocker arm drives the exhaust valve crane span structure.Exhaust valve is in closed condition usually under the exhaust valve spring effect.In order to realize the diesel exhaust gas braking, a throttle valve is installed, when the needs exhaust brake on the diesel engine total air escape pipe; Utilize throttle valve that total air escape pipe is blocked, the gas exhaust manifold internal pressure rises rapidly, makes diesel engine be equivalent to compressor operating; To absorb the vehicle movement energy, reach the braking purpose.
For present embodiment: when the exhaust valve closure of diesel engine, cause the air pressure of outlet pipe one end sharply to rise, make the exhaust valve after closing open a little gap in this powerful air pressure fluctuation moment; Meanwhile, the space of abdicating after utilizing oil-way system and moving element (promptly forming the small piston of hydraulic cylinder) that valve is descended is full of machine oil, makes exhaust valve stay the position that vibration is opened because machine oil is difficult to be compressed.In the aspirating stroke stage, descent of piston is air-breathing.The interior pressure reduction of this moment outlet pipe and cylinder is very big, gas flow under the effect of pressure reduction, and gas is very little through the passage of exhaust valve, has so just realized the throttling of exhaust, takes away lot of energy, has improved retardation efficiency.
In the compression stroke stage; Diesel engine piston is up, and when piston was near the lower dead center, the low exhaust end pressurized gas of in-cylinder pressure got into cylinder through the little gap of exhaust valve; Pressure in cylinder equates with the pressure of exhaust end; At this moment piston continuation is up, and the gas pressure in the cylinder is risen to than exhaust end pressure height very soon, and the gas in the cylinder flows to outlet pipe through a little gap of exhaust valve at this moment.Gas is very little through the passage of exhaust valve, has just realized the throttling of exhaust, takes away lot of energy, has improved retardation efficiency.
In the expansion stroke stage, this moment, the oil pump oil-break did not have fuel oil in the cylinder.Descent of piston descends the pressure in the cylinder very soon, and at this moment gas pressure balancing is broken once more.The throttling phenomenon occurs once more, and significant amount of energy is taken away in throttling, improves braking effect.
To exhaust stroke stage (as shown in the figure): rocking arm drives the valve crane span structure downwards, and the valve crane span structure drives exhaust valve downwards.The machine oil that exhaust valve is opened in the small piston of back by rocking arm releases with the draining hole on passing a bridge.The exercise recovery of diesel engine is normal.This cylinder is accomplished an exhaust brake circulation thus.Other each cylinders carry out exhaust brake successively by firing order, up to the cancellation exhaust brake.
Claims (2)
1. heavy goods vehicles is used the diesel exhaust gas braking device, comprises exhaust valve crane span structure, piston sleeve, piston, spacing snap ring, oil pocket, oil inlet hole, draining hole, one-way valve, spring, exhaust valve etc.In exhaust valve crane span structure (1), be provided with a piston sleeve (2); Piston (3) can move up and down at piston sleeve; Spacing snap ring (4) is equipped with in the lower end of piston sleeve (2), and piston sleeve is provided with oil pocket (5) and corresponding oil inlet hole (6) and draining hole (7), and oil inlet hole is equipped with one-way valve (8); Spring (9) is housed in the inner chamber of the piston back side; Pack into and have in the cylinder head cover (12) of oil duct (10) and exhaust port (11) in the oil pocket upper end, rocking arm (13) drives exhaust valve crane span structure (1), the folding of exhaust valve (14) below the control piston thus according to the different stroke stage of diesel engine.
2. use the diesel exhaust gas braking device according to the described heavy goods vehicles of claim 1; It is characterized in that controlling by said piston (3) aperture of exhaust valve (14) through the mobile position of controlling said valve crane span structure (1); Through reducing gas pressure in the cylinder, make the rotating speed decline of diesel engine reach the braking purpose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103659125A CN102493877A (en) | 2011-11-17 | 2011-11-17 | Diesel engine exhaust braking device for heavy-duty vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103659125A CN102493877A (en) | 2011-11-17 | 2011-11-17 | Diesel engine exhaust braking device for heavy-duty vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102493877A true CN102493877A (en) | 2012-06-13 |
Family
ID=46185729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103659125A Pending CN102493877A (en) | 2011-11-17 | 2011-11-17 | Diesel engine exhaust braking device for heavy-duty vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102493877A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001098912A (en) * | 1999-09-30 | 2001-04-10 | Jidosha Buhin Kogyo Co Ltd | Engine brake device and method of controlling it |
| CN2816383Y (en) * | 2005-08-18 | 2006-09-13 | 马银良 | Wariable-valve engine speed-reducer |
| CN201021640Y (en) * | 2007-07-13 | 2008-02-13 | 湖北世纪中远车辆有限公司 | Engine arrester |
| CN101649761A (en) * | 2009-08-16 | 2010-02-17 | 李金龙 | Gas bleed brake of engine |
| CN102032013A (en) * | 2009-10-02 | 2011-04-27 | 德国曼商用车辆股份公司 | Internal combustion engine having motor brake assembly |
| US20110120411A1 (en) * | 2009-11-23 | 2011-05-26 | International Engine Intellectual Property Company, Llc | Solenoid control for valve actuation in engine brake |
-
2011
- 2011-11-17 CN CN2011103659125A patent/CN102493877A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001098912A (en) * | 1999-09-30 | 2001-04-10 | Jidosha Buhin Kogyo Co Ltd | Engine brake device and method of controlling it |
| CN2816383Y (en) * | 2005-08-18 | 2006-09-13 | 马银良 | Wariable-valve engine speed-reducer |
| CN201021640Y (en) * | 2007-07-13 | 2008-02-13 | 湖北世纪中远车辆有限公司 | Engine arrester |
| CN101649761A (en) * | 2009-08-16 | 2010-02-17 | 李金龙 | Gas bleed brake of engine |
| CN102032013A (en) * | 2009-10-02 | 2011-04-27 | 德国曼商用车辆股份公司 | Internal combustion engine having motor brake assembly |
| US20110120411A1 (en) * | 2009-11-23 | 2011-05-26 | International Engine Intellectual Property Company, Llc | Solenoid control for valve actuation in engine brake |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202140127U (en) | Driving mechanism of engine braking device | |
| CN203097985U (en) | Engine braking device with special cam for braking single valve | |
| CN102562214A (en) | Compound rocker arm device used for producing auxiliary valve movement of engine | |
| CN110541761B (en) | Engine brake hydraulic control device capable of filling oil quickly | |
| CN104343550A (en) | Engine operation method and vehicle | |
| CN101368517B (en) | Engine braking device and method | |
| CN202611787U (en) | Fixed-chain-type special rocker arm brake device | |
| CN104148563B (en) | Novel air pneumatic hammer | |
| CN102937052A (en) | Variable-compression-ratio mechanism of engine | |
| CN201924978U (en) | Combined rocker arm device used for generating auxiliary air valve movement of engine | |
| CN102947573B (en) | Use the engine braking system of spring-opposed valve | |
| CN102003237B (en) | Engine braking improving device | |
| CN101892942A (en) | Single piston hydraulic free-piston engine capable of reducing pumping flow pulsation | |
| CN103388504B (en) | A kind of solid chain type dedicated rocker arm braking device | |
| CN105317491A (en) | Engine rocker arm shaft seat assembly and engine braking system | |
| CN201751554U (en) | Solid chain type engine braking device | |
| CN106703928A (en) | Exhaust valve control execution system directly driven by servo oil | |
| CN102493877A (en) | Diesel engine exhaust braking device for heavy-duty vehicle | |
| CN102011622B (en) | Improved engine brake driving device | |
| CN201513210U (en) | Driving mechanism for engine brake and capable of being integrated with engine | |
| CN201496153U (en) | Engine brake management system | |
| CN202937322U (en) | Integrated rocking arm for engine braking | |
| CN104454158A (en) | Variable-stroke pneumatic internal combustion hybrid power engine and running method thereof | |
| CN201661328U (en) | Driving device for engine brake | |
| CN102661237A (en) | Semiautomatic flow distribution type hydraulic free piston engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120613 |