CN102003241B - Improved driving mechanism for engine braking - Google Patents
Improved driving mechanism for engine braking Download PDFInfo
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- CN102003241B CN102003241B CN 200910194870 CN200910194870A CN102003241B CN 102003241 B CN102003241 B CN 102003241B CN 200910194870 CN200910194870 CN 200910194870 CN 200910194870 A CN200910194870 A CN 200910194870A CN 102003241 B CN102003241 B CN 102003241B
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- engine braking
- rocking arm
- driving mechanism
- notch
- improved driving
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Abstract
The invention relates to an improved driving mechanism for engine braking comprising an exhaust valve control mechanism. The exhaust valve control mechanism consists of a driving force input cam, a cam driven wheel, a push rod, a rocker arm and a rockshaft. A piston hole is arranged at the other end of the rocker and is internally provided with a brake plunger; an axial groove is arranged on an outer wall at the upper end in the middle of the brake plunger; one end of a pin fixed on the rocker extends in the axial groove; a notch is arranged at the lower end in the middle of the brake plunger corresponding to the axial groove; holes are arranged on a side wall of the piston hole corresponding to the position of the notch; and the upper end of an exhaust valve connector fixed on an engine valve bridge passes through holes on the piston hole wall and is located right below the upper side face of the notch. The driving force input cam periodically transmits the engine power to the rocker and the gap between the rocker and the exhaust valve rod connector is controlled by using an electromagnetic valve, thereby the braking and normal working states are switched, the volume and weight of the brake are reduced, and high oil pressure as well as leakage, deformation and load fluctuation caused by high oil pressure is avoided.
Description
Technical field:
The present invention relates to mechanical field, relate in particular to the braking device of motor, particularly a kind of improved driving mechanism that is used for engine braking.
Background technique:
In the existing technology, internal-combustion engine is known as the method behaviour of brake tool altogether, only needed temporarily convert motor into compressor.Fuel oil is cut off in this conversion; When the engine piston compression stroke finishes or when finishing, open outlet valve; Allowing to be compressed gas (being air during braking) is released; The motor energy that pressurized gas absorbed in compression stroke can not turn back to engine piston at expansion stroke subsequently, but dissipate through the exhaust and the radiation system of motor.Final result is effective engine braking, slows down the speed of vehicle.
A precedent of engine brake is that the U.S. Patent number 3220392 that is provided by comings (Cummins) discloses, according to the engine braking system of this patent manufacturing commercial very successful.But, this type of engine braking system is the annex of overhead on motor.For this type of engine brake is installed, between cylinder and valve gap, to add packing ring, therefore, increased height, weight and the cost of motor extraly.Above-mentioned these problems are because engine braking system is used as an annex of motor, rather than of motor constituent element or integrated part caused.
Engine brake of the prior art is delivered to the outlet valve that will open through oil hydraulic circuit with the machinery input.Be usually included in reciprocating main piston in the master piston bore on the oil hydraulic circuit; This to-and-fro motion comes from the Engine Mechanical input; Such as the shaking of oil sprayer rocking arm, the hydraulic fluid that moves through of main piston is delivered to the sub-piston on the oil hydraulic circuit, makes its to-and-fro motion in slave piston bore; Sub-piston acts on the outlet valve directly or indirectly, produces the valve actuation of engine braking running.
Therefore; Above-mentioned by hydraulically powered another shortcoming of conventional engines break existence, i.e. the contractibility of hydraulic system or distortion, this flexibility with liquid is relevant; A large amount of compressions that high flexibility causes brake valve to rise reduce; Valve rises reduces the increase that causes valve to carry, and the increase that valve carries causes higher flexibility, causes a kind of vicious circle.In addition, the valve liter that is caused by hydraulic pressure distortion reduces to increase along with the increase of engine speed, and to rise trend on the contrary with the desired brake valve of engine braking performance.In order to reduce flexible hydraulic, must use large diameter hydraulic piston, increase volume and weight.And oily stream need make enlarged bore piston stretch out for a long time or withdraw, and causes that braking system inertia is big, reaction is slow.
Summary of the invention:
The object of the present invention is to provide a kind of improved driving mechanism that is used for engine braking; The overhead mode that the described this improved driving mechanism that is used for engine braking will solve the existing technology engine braking system has increased the height of motor and the technical problem of manufacture cost, will solve the technical problem that braking system inertia is big, reaction is slow that hydraulically powered engine brake exists simultaneously.
This improved driving mechanism that is used for engine braking of the present invention is made up of an outlet valve control mechanism; Wherein, Described outlet valve control mechanism is made up of driving force input cam mechanism, rocking arm and pitman arm shaft, and an end of described rocking arm is provided with a piston hole, is provided with a spool in the described piston hole; Be provided with liquid sealing between the sidewall of described spool the inner and piston hole; Spool has one first station and one second station in piston hole, described driving force input cam mechanism is arranged on the other end of rocking arm, and rocking arm is arranged on the described pitman arm shaft.
Further, described spool is provided with first working surface and second working surface, and first working surface and second working surface are corresponding with described first station and second station.
Further; Upper end, the middle part of described spool outer wall is provided with an axial grooving; rocking arm upper edge piston hole radially be set with a pin; an end of described pin extends in the described axial grooving, and lower end, spool middle part is provided with the notch that radially extends along it, is provided with the hole with the sidewall of the corresponding piston hole of described notch position.
Further; Be provided with the fluid passage in the described pitman arm shaft vertically, be provided with radial hole along radial direction; Be provided with fluid passage in the described rocking arm, an end of described fluid passage is communicated with described radial hole, and the other end is communicated with described piston hole.
Further, be provided with spring between described spool outer end and the rocking arm outer end.
Further, the axial length of the axial length of described axial grooving and described notch is suitable.
Further, the axial cross section of described notch is the base and is longer than the trapezoidal of top margin, and the side that described notch is positioned at described spring one side is the inclined-plane, and it is vertical plane that described notch is positioned at the inner side of described brake piston.
Further, be provided with braking valve clearance adjusting screw between described push rod and the rocking arm, described braking valve clearance adjusting screw is connected with push rod, is connected with a nut after braking the end that the valve clearance adjusting screw passes rocking arm.
Further, described driving force input cam within it basic circle be provided with at least one convex portion.
Further, described fluid passage is communicated with oil-feed port and oil drain out in the three-way magnetic valve.
Working principle of the present invention is: the driving force input cam is connected with the power take-off mechanism of motor, and the driving force input cam makes rocker arms roll under the motivational drive of motor.The outlet valve valve stem coupling member is arranged on the control valve rod of engine exhaust valve.Need motor when normal working is converted to engine braking, send actuating signal to three-way magnetic valve through a controller.Three-way magnetic valve is by open-minded through the electric current of its positive terminal and negative terminal; The spool of solenoid valve glides; Open oil-feed port, machine oil gets in the piston hole, after the valve bridge is pushed open by the rocking arm of exhaust valve actuation device through the brake fluid networking; Oil pressure overcomes the load of spring, and spool is pushed away to the right.Spool rests on the locating stud that is fixed in the brake rocker arm through the axial groove in it, has moved on to operating position.At this moment, the operating surface on the left side will with outlet valve valve stem coupling member top, form the solid link.The motion that small boss produced of brake cam through brake rocker arm, spool, is delivered to valve bridge and outlet valve, produces engine braking.When not needing engine braking, the engine braking control mechanism cuts out draining, and spool does not receive oil pressure, under the effect of spring, to moving to left, gets back to off position, separates with the motor normal operation.
The present invention and prior art compare, and its effect is actively with tangible.The present invention utilizes cam that the power of motor periodically is delivered to rocking arm, utilizes the exhaust action of rocking arm operations platoon air valve, utilizes the gap between electromagnetic valve rocking arm and the outlet valve drive end; Realize the switching of braking and motor proper functioning two states and keep; Can be integrated with motor, thus the volume and weight of engine brake reduced, need not adopt the hydraulic braking control valve; Reduced cost; Reduced reaction time, the leakage, distortion and the load fluctuation that do not have high oil pressure and high oil pressure to cause, brake valve rise the influence that does not receive oil temperature, oil pressure and air content; Brake valve rises can obtain littler value, reduces the requirement to engine piston and valve clearance.
Description of drawings:
Fig. 1 is a kind of improved structural representation that is used for the driving mechanism of engine braking of the present invention (Fig. 1 do not draw spool part).
Fig. 2 is the structural representation of the spool of a kind of improved driving mechanism that is used for engine braking of the present invention.
Fig. 3 is the schematic representation of working state of fluid passage and the three-way magnetic valve of a kind of improved driving mechanism that is used for engine braking of the present invention.
Fig. 4 is the schematic representation of another working state of fluid passage and the three-way magnetic valve of a kind of improved driving mechanism that is used for engine braking of the present invention.
Embodiment:
Embodiment 1:
Like Fig. 1, Fig. 2, Fig. 3 and shown in Figure 4; A kind of improved driving mechanism 100 that is used for engine braking of the present invention; Constitute by an outlet valve control mechanism 2002; Wherein, the described outlet valve control mechanism driving force input cam of described outlet valve control mechanism 2,002 2302, cam follower wheel 2352, push rod 2012, rocking arm 2102 and pitman arm shaft 205 constitute, and the middle part of described rocking arm 2102 is arranged on the pitman arm shaft 205; One end of described push rod 2012 is connected with an end of rocking arm 2102; Described cam follower wheel 2352 is arranged in the other end of push rod 2012, and described driving force input cam 2302 is arranged on outside the cam follower wheel 2352, and the excircle of the rotation round of bump and cam follower wheel 2352 intersects in the driving force input cam 2302; rocking arm 2102 arranged outside have a biasing Returnning spring 1982; the other end of rocking arm 2102 is provided with a piston hole 166, is provided with a spool 160 in the described piston hole 166, and described spool 160 the inners are provided with an axial blind hole; the hydraulic channel that is provided with in described axial blind hole and the described rocking arm 2102 is communicated with 214; be provided with liquid sealing between the inner sidewall with described piston hole of described spool and be connected, described spool outer end is provided with an axle spring mounting hole, is provided with an end of a spring 177 in the described spring mounting hole; described spring 177 the other ends are fixed on the described rocking arm 2102 through snap ring 176; outer wall is provided with an axial grooving 137 on the middle part of described spool 160, and piston hole 166 radially is set with a pin 142 in the rocking arm upper edge, and an end of described pin 142 extends in the described axial grooving 137; lower end, described spool 160 middle part is provided with the notch that radially extends along it; axial length of described axial grooving equates that with the axial length of described notch the upper side of described notch is a working surface 145, and the described spool outer side surface lower end that is positioned at the described notch left side is scabbled and is provided with another working surface 140; described two working surfaces 140, step of formation between 145; be provided with the hole with the corresponding described piston hole sidewall of described notch position, described hole is passed Yu described notch aligns in exhasut valve stem link 116 upper ends, and the upper side 145 of described notch is Yu be provided with the gap between described outlet valve link 116 upper-end surfaces.
Further, the axial cross section of described notch is the base and is longer than the trapezoidal of top margin, and the side that described notch is positioned at described spring one side is the inclined-plane, and it is vertical plane that described notch is positioned at the inner side of described brake piston.
Further; Be provided with braking valve clearance adjusting screw 1102 between described push rod 2012 and the rocking arm 2102; Described braking valve clearance adjusting screw 1102 is connected with push rod 2012, and braking valve clearance adjusting screw 1102 is connected with a nut 1052 after passing an end of rocking arm 2102.
Further, described driving force input cam 2302 within it basic circle be provided with two convex portions 232,233.
Further, the oil-feed port in described fluid passage 211 and the three-way magnetic valve 51 111 is communicated with oil drain out 222.
Working procedure of the present invention is: driving force input cam 2302 is connected with the power take-off mechanism (not shown) of motor, and driving force input cam 2302 shakes rocking arm 2102 under the motivational drive of motor.Outlet valve valve stem coupling member 116 is arranged on the control valve rod 3001 of engine exhaust valve 300.Need motor when normal working is converted to engine braking, send actuating signals to three-way magnetic valve 51 through a controller (not drawing among the figure).Three-way magnetic valve 51 is by open-minded through the electric current of its positive terminal 55 and negative terminal 57; The spool 58 of solenoid valve 51 glides; Open oil-feed port 111, let hydraulic fluid enter in the piston hole 166 of spool 160 rear sides, after valve bridge 400 is pushed open by the rocking arm 210 of exhaust valve actuation device through the fluid passage in the pitman arm shaft 205 211 and radial hole 212, rocking arm 2102 interior otch 213 and hydraulic channels 214; Oil pressure overcomes the load of spring 177, with pushing away to the right on the spool 160.Spool 160 rests on the locating stud 142 that is fixed in the brake rocker arm through the axial groove 137 in it, has moved on to operating position.At this moment, the operating surface 140 on the left side will with outlet valve valve stem coupling member 116 tops, form the solid link.The motion that the small boss 232,233 of brake cam is produced; Through brake rocker arm 2102, spool 160; Be delivered to outlet valve 300; The resistance, the valve block disengaging that make control valve rod 3001 overcome valve spring 3101 are arranged on valve seat 320 in the engine cylinder cover 500, and gas is discharged engine braking through outlet pipe 600.When not needing engine braking; The engine braking control mechanism cuts out draining, and spool 160 does not receive oil pressure, under the effect of spring 177 to moving to left; Get back to off position; Working surface 145 is positioned at outlet valve valve stem coupling member 116 tops, and outlet valve 300 is kept normal working, and the improved driving mechanism that is used for engine braking separates with the motor normal operation.
In the embodiment shown in fig. 1; Also be provided with another outlet valve 300 in the motor; Be provided with control valve rod 3002 in this outlet valve 300; The control valve rod is provided with another valve spring 3102, and valve spring 3101 and valve spring 3102 are arranged between engine cylinder cover 500 and the valve bridge 400, and valve bridge 400 makes 300 interlocks of two outlet valves.Valve bridge 400 is provided with exhaust valve actuation device 200, and exhaust valve actuation device 200 is made up of exhaust valve actuation cam 230, exhaust valve actuation rocking arm 210 and valve bridge 400.Exhaust-valve cam 230 has a big convex portion 220 on the basic circle 225 within it, is installed on the exhaust valve rocker arm axle 2051 exhaust valve actuation rocking arm 210 swing types, and an end of exhaust valve actuation rocking arm 210 is provided with cam follower wheel 235.
Present embodiment is that the present invention will be described, rather than limits it.In fact, those people that are expert at one's trade can show to change places and in scope of the present invention and principle, the present invention made amendment and change.For instance, certain part of functions that concrete mechanism illustrated or described can be used for another concrete mechanism, and then obtains a new mechanism.Therefore, the present invention will comprise above-mentioned modification and change, as long as they belong within appended claim or the scope suitable with the institute prescription.
Claims (10)
1. improved driving mechanism that is used for engine braking; Constitute by an outlet valve control mechanism; It is characterized in that: described outlet valve control mechanism is made up of driving force input cam mechanism, rocking arm and pitman arm shaft, and an end of described rocking arm is provided with a piston hole, is provided with a spool in the described piston hole; Be provided with liquid sealing between the sidewall of described spool the inner and piston hole; Spool has one first station and one second station in piston hole, described driving force input cam mechanism is arranged on the other end of rocking arm, and rocking arm is arranged on the described pitman arm shaft.
2. a kind of improved driving mechanism that is used for engine braking as claimed in claim 1; It is characterized in that: described spool is provided with first working surface and second working surface, and first working surface and second working surface are corresponding with described first station and second station.
3. a kind of improved driving mechanism that is used for engine braking as claimed in claim 1; It is characterized in that: upper end, the middle part of described spool outer wall is provided with an axial grooving; rocking arm upper edge piston hole radially be set with a pin; an end of described pin extends in the described axial grooving, and lower end, spool middle part is provided with the notch that radially extends along it, is provided with the hole with the sidewall of the corresponding piston hole of described notch position.
4. a kind of improved driving mechanism that is used for engine braking as claimed in claim 1; It is characterized in that: be provided with the fluid passage in the described pitman arm shaft vertically, be provided with radial hole along radial direction; Be provided with fluid passage in the described rocking arm; One end of described fluid passage is communicated with described radial hole, and the other end is communicated with described piston hole.
5. a kind of improved driving mechanism that is used for engine braking as claimed in claim 1 is characterized in that: be provided with spring between described spool outer end and the rocking arm outer end.
6. according to claim 1 or claim 2 a kind of improved driving mechanism that is used for engine braking, it is characterized in that: the axial length of described axial grooving is suitable with the axial length of described notch.
7. according to claim 1 or claim 2 a kind of improved driving mechanism that is used for engine braking; It is characterized in that: the axial cross section of described notch is the base and is longer than the trapezoidal of top margin; The side that described notch is positioned at described spring one side is the inclined-plane, and it is vertical plane that described notch is positioned at the inner side of described brake piston.
8. a kind of improved driving mechanism that is used for engine braking as claimed in claim 1; It is characterized in that: be provided with braking valve clearance adjusting screw between described push rod and the rocking arm; Described braking valve clearance adjusting screw is connected with push rod, and braking valve clearance adjusting screw is connected with a nut after passing an end of rocking arm.
9. a kind of improved driving mechanism that is used for engine braking as claimed in claim 1, it is characterized in that: described driving force input cam basic circle within it is provided with at least one convex portion.
10. like claim 1 or 3 described a kind of improved driving mechanisms that are used for engine braking, it is characterized in that: described fluid passage is communicated with oil-feed port and oil drain out in the three-way magnetic valve.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910194870 CN102003241B (en) | 2009-08-31 | 2009-08-31 | Improved driving mechanism for engine braking |
| KR1020117018023A KR101290440B1 (en) | 2009-01-05 | 2009-12-28 | Engine braking devices and methods |
| PCT/US2009/069622 WO2010078280A2 (en) | 2009-01-05 | 2009-12-28 | Engine braking devices and methods |
| BRPI0922516-1A BRPI0922516B1 (en) | 2009-01-05 | 2009-12-28 | APPARATUS TO CHANGE AN INTERNAL COMBUSTION ENGINE FROM A NORMAL ENGINE OPERATION FOR AN ENGINE BRAKING OPERATION AND METHOD FOR CONVERTING AN INTERNAL COMBUSTION ENGINE FROM A NORMAL ENGINE OPERATION TO AN ENGINE BRAKING OPERATION |
| EP09837091.9A EP2384396B1 (en) | 2009-01-05 | 2009-12-28 | Engine braking devices and methods |
| EP11006452.4A EP2439381B1 (en) | 2009-01-05 | 2009-12-28 | Engine braking devices and methods |
| RU2011132887/06A RU2479735C1 (en) | 2009-01-05 | 2009-12-28 | Device and methods for overrunning |
| EP11006451.6A EP2444602B1 (en) | 2009-01-05 | 2009-12-28 | Engine braking devices and methods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910194870 CN102003241B (en) | 2009-08-31 | 2009-08-31 | Improved driving mechanism for engine braking |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102003241A CN102003241A (en) | 2011-04-06 |
| CN102003241B true CN102003241B (en) | 2012-05-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910194870 Expired - Fee Related CN102003241B (en) | 2009-01-05 | 2009-08-31 | Improved driving mechanism for engine braking |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102003241B (en) |
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2009
- 2009-08-31 CN CN 200910194870 patent/CN102003241B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN102003241A (en) | 2011-04-06 |
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Granted publication date: 20120530 Termination date: 20180831 |