CN201679528U - Fast braking engine braking gear - Google Patents
Fast braking engine braking gear Download PDFInfo
- Publication number
- CN201679528U CN201679528U CN 200920208709 CN200920208709U CN201679528U CN 201679528 U CN201679528 U CN 201679528U CN 200920208709 CN200920208709 CN 200920208709 CN 200920208709 U CN200920208709 U CN 200920208709U CN 201679528 U CN201679528 U CN 201679528U
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- driven plunger
- hole
- braking
- rocking arm
- engine braking
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Abstract
The utility model relates to a fast braking engine braking gear comprising an air exhaust valve controlling mechanism consisting of a force-driven input cam, a driven pulley affiliated on the cam, a push rod, a swinging arm and a swinging arm shaft. One end of the push rod is connected with one end of the swinging arm; the driven pulley is arranged on the other end of the push rod; the force-driven input cam is provided out of the driven pulley and one end of the swinging arm is provided with a horizontally arranged driving piston and a vertical braking plunger piston; in the middle part of the driving piston is equipped an annular groove, whose side surface, together with the side surface of the driving piston on the left, works as a non-working face and a working face and are pressed to be in close contact with the top surface of the braking plunger piston under which the air exhaust valve rod is connected. The force-driven input cam transmits the power generated from the electromotor to the swinging arm periodically. By taking advantage of the electromagnetic valve to control the gap between the swinging arm and the connecting member of the air exhaust valve rod, a switch from a braking state to a normal work state can be achieved by a size-and-weight reduced brake while not affected by oil-pressure or problems associated therewith, for instance, oil leakage, shape-transforming or load fluctuating.
Description
Technical field:
The utility model relates to mechanical field, relates in particular to the engine braking apparatus of the braking device of motor, particularly a kind of fast braking.
Background technique:
In the prior art, internal-combustion engine is known altogether as the method behaviour of brake tool, only needed motor temporarily is converted to 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 by 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 machinery input of motor, such as the shaking of oil sprayer rocking arm, the hydraulic fluid that moves through of main piston is delivered to sub-piston on the oil hydraulic circuit, make 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-mentionedly there is another shortcoming by hydraulically powered conventional engines break, be the contractibility or the distortion of hydraulic system, 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 purpose of this utility model is to provide a kind of engine braking apparatus of fast braking, the overhead mode that the engine braking apparatus of described this fast braking will solve engine braking system in the prior art 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.
The engine braking apparatus of this fast braking of the present utility model is made of an outlet valve control mechanism, wherein, described outlet valve control mechanism is by the driving force input cam; rocking arm and pitman arm shaft constitute; rocking arm one end is provided with a vertical hole and a horizontal hole; vertically the upper end, hole is intersected with described horizontal hole and is three-port structure; be provided with spool in the described vertical hole; be provided with driven plunger in the described horizontal hole; described driven plunger middle part is provided with annular groove; be connected for liquid sealing between the outer side wall of described driven plunger the inner and the described horizontal hole; be provided with liquid sealing between the outer side wall of described spool and the described vertical hole and be connected; described driving force input cam mechanism is arranged on the other end of rocking arm, and rocking arm is arranged on the pitman arm shaft.
Concrete, the middle part outer wall of described spool is provided with axial grooving, being provided with liquid sealing between the spool of described axial grooving upper end and the described vertical hole is connected, described vertical hole lower end edge radially is set with a pin, one end of described pin extends in the axial grooving of described spool, described driven plunger the inner is provided with axial blind hole, is provided with oilhole between described axial blind hole bottom and the described annular groove.
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 horizontal hole.
Further, the fluid passage in described horizontal hole one end and the described rocking arm is communicated with, the described horizontal hole the other end and described rocking arm end face, and lower end, described vertical hole flushes with described rocking arm lower end.
Further, described spool lower end is fixed with an end of spring, and on described rocking arm, described spool upper-end surface contacts with the annular groove at described driven plunger middle part the described spring the other end by bolt.
Further, be fixed with a spring seat that stretches out described rocking arm, be provided with another spring between described driven plunger outer end and the described spring seat in described horizontal hole outer end.
Further, the axial cross section of described annular groove is inner edge and is shorter than the trapezoidal of outside, it is axially vertical with described driven plunger that described annular groove is positioned at the side of described driven plunger outer end, and the side that described annular groove is positioned at described driven plunger the inner is the plane of inclination.
Further, described driven plunger outer end is provided with axial blind hole, described another spring one end is arranged in the described blind hole, described spring seat is the cylinder barrel shaped with annular exterior edge face, the annular exterior edge face of described spring seat is provided with location cylinder along its axial direction, and the length of described location cylinder is more than or equal to the length of the blind hole of described driven plunger outer end.
Further, described spool upper end is the step axle, and the external diameter of described spool upper end is less than the external diameter of its lower end.
Further, the upper surface of described spool is a cylndrical surface, is complementary with the outer side wall of described driven plunger the inner.
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 utility model 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 by a controller.Three-way magnetic valve is by open-minded by the electric current of its positive terminal and negative terminal, the spool of solenoid valve glides, open oil-feed port, machine oil is by the brake fluid networking, comprise the fluid passage in the brake rocker arm, flow to braking drive organ, the oilhole that oil circulation is overdrived in the piston enters in the horizontal hole of rocking arm.The toroidal surface at driven plunger middle part is as non-working surface, and driven plunger left end outer side surface is a working surface.Oil pressure overcomes the load of driven plunger right-hand member spring, and spool is pushed away downwards.Spool rests on the locating stud that is fixed in the rocking arm lower end by the axial groove in it, and its stroke is equal to or slightly greater than the distance between the not operation surface and operating surface on the driven plunger.After spool moved down, driven plunger just can be under the oil pressure effect, and the load that overcomes spring moves right, and rests on the spring seat.At this moment, the upper surface of spool contacts with the operating surface of driven plunger, forms the solid link, and the driving mechanism of engine braking is in operating position.The small boss of brake cam and the motion that is produced by brake rocker arm, driven plunger, spool and exhasut valve stem link, are delivered to outlet valve, produce engine braking.When not needing engine braking, the engine braking control mechanism cuts out draining, and driven plunger is not subjected to oil pressure, to moving to left, rests on the left side of horizontal hole under the effect of spring.Spool is upwards moved by acting in the hole of brake spring, gets back to off position, separates with the motor normal operation.
The utility model and prior art compare, and its effect is actively with tangible.The utility model utilizes cam that the power of motor periodically is delivered to rocking arm, utilize the exhaust action of rocking arm operations platoon air valve, utilize 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, thereby reduce the volume and weight of engine brake, need not adopt the hydraulic braking control valve, reduced cost, reduced reaction time, the leakage that does not have high oil pressure and high oil pressure to cause, distortion and load fluctuation, brake valve rises and is not subjected to the oil temperature, the influence of 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 the structural representation (do not draw among Fig. 1 spool and driven plunger part) of the engine braking apparatus of fast braking of the present utility model.
Fig. 2 is the schematic representation that the braking drive organ in the engine braking apparatus of fast braking of the present utility model is in the off-position.
Fig. 3 is the schematic representation that the braking drive organ in the engine braking apparatus of fast braking of the present utility model is in " opening " position.
Fig. 4 is the schematic representation of the working state of fluid passage in the engine braking apparatus of fast braking of the present utility model and three-way magnetic valve.
Fig. 5 is the schematic representation of another working state of fluid passage in the engine braking apparatus of fast braking of the present utility model and three-way magnetic valve.
Embodiment:
Embodiment 1:
Such as Fig. 1; Fig. 2; Fig. 3; Fig. 4 and shown in Figure 5; The engine braking apparatus 100 of fast braking of the present utility model; Consisted of by an air bleeding valve controlling organization 2002; Wherein, Described air bleeding valve controlling organization 2002 is by driving force input cam 2302; Cam follower wheel 2352; Push rod 2012; Rocking arm 2102 and rocker arm shaft 205 consist of; The middle part of described rocking arm 2102 is arranged on the rocker 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; Described driving force input cam 2302 is arranged on outside the cam follower wheel 2352; Protuberance 232 in the driving force input cam 2302; The excircle of 233 rotation round and cam follower wheel 2352 intersects; Rocking arm 2102 arranged outside have a biasing back-moving spring 1982; Be provided with fluid passage 214 in the described rocking arm 2102; The other end of rocking arm 2102 is provided with a vertical hole 190 and a lateral aperture 166; Described lateral aperture 166 1 ends are communicated with fluid passage 214 in the described rocking arm 2102; Described lateral aperture 166 other ends and described rocking arm 2102 end face; 190 lower ends, described vertical hole flush with described rocking arm 2102 lower ends; 190 upper ends, described vertical hole and described lateral aperture 166 intersect and are three-port structure; Be provided with spool 160 in the described vertical hole 190; Described spool 160 is positioned at directly over the exhasut valve stem connector 116; Be provided with driven plunger 164 in the described lateral aperture 166; Described driven plunger 164 middle parts are provided with an annular groove; The middle part outer wall of described spool 160 is provided with an axial grooving 137; Being provided with liquid sealing between spool 160 lateral surfaces of described axial grooving 137 upper ends and the described vertical hole 190 is connected; Vertical hole 190 lower end edges of rocking arm 2102 radially are fixedly installed a pin 142; One end of described pin 142 extends in the axial grooving 137 of described spool; Described spool 160 lower ends are fixed with spring 177; Described spring 177 other ends are fixed on the described rocking arm 2102 by bolt 179; The bias power that described spring 177 makes progress for described spool 160; Described spool upper surface 146 compresses with the annulus groove face 145 at described driven plunger middle part and contacts; Described annulus groove face 145 is the non-working surface 145 of the utility model driving mechanism, and driven plunger 164 left end lateral surfaces 140 are working face 140. Be connected for liquid sealing between the outer side wall 140 of described driven plunger the inner and described horizontal hole 166 inwalls, the length of described axial grooving 137 is equal to or greater than the distance 130 between described annular groove outer side surface 145 and the inner outer side surface 140 of described driven plunger, described driven plunger 164 the inners are provided with the axial blind hole coaxial with described driven plunger, be provided with oilhole 196 between described axial blind hole bottom and the described annular groove, be fixed with a spring seat 158 that stretches out described rocking arm in described horizontal hole 166 outer ends, be provided with another spring 156 between described driven plunger 164 outer ends and the described spring seat 158, the fluid passage 214 that described horizontal hole 166 is inner and described rocking arm is interior is communicated with by a shoulder hole, the diameter of described shoulder hole is less than the diameter of described horizontal hole, described another spring 156 is given described driven plunger 164 bias power left, and described driven plunger 164 left sides 246 compress with described shoulder hole end face and contact.
Further, the axial cross section of described annular groove is inner edge and is shorter than the trapezoidal of outside, it is axially vertical with described driven plunger that described annular groove is positioned at the side of described driven plunger outer end, and the side that described annular groove is positioned at described driven plunger the inner is the plane of inclination.
Further, described driven plunger outer end is provided with axial blind hole, described another spring 156 1 ends are arranged in the described blind hole, described spring seat 158 is the cylinder barrel shaped with annular exterior edge face, the annular exterior edge face of described spring seat is provided with location cylinder along its axial direction, and the length of described location cylinder is more than or equal to the length of the blind hole of described driven plunger outer end.Spring 156 can not depart from the time of can guaranteeing like this that driven plunger 164 moves.
Further, described spool 160 upper ends are step axles, and the external diameter of described spool upper end is less than the external diameter of its lower end, and it has a cylindrical side 147.This side 147 also can be a plane.
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, the upper surface of described spool 160 is cylndrical surface, is complementary with the outer side wall of described driven plunger 164 the inners.
Further, described driving force input cam 2302 within it basic circle 2252 be provided with a lug boss 232 and a lug boss 233.
Further, described fluid passage 211 is communicated with oil-feed port 111 and oil drain out 222 in the three-way magnetic valve 51.
The working procedure of present embodiment 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 by a controller (not shown).Three-way magnetic valve 51 is by open-minded by the electric current of its positive terminal 55 and negative terminal 57, the spool 58 of solenoid valve glides, open oil-feed port 111, allow in the horizontal hole 166 that hydraulic fluid enters into rocking arm by otch 213 in the fluid passage 211 in the pitman arm shaft 205 and radial hole 212, the rocking arm 2102 and hydraulic channel 214, flow to braking drive organ 100, the oilholes 196 that oil circulation is overdrived in the piston 164 enter in the horizontal hole of rocking arm.The toroidal surface at driven plunger 164 middle parts is as non-working surface 145, and driven plunger left end outer side surface is a working surface 140.Oil pressure overcomes the load of driven plunger right-hand member spring 156, and spool 160 is pushed away downwards.Spool 160 rests on the locating stud 142 that is fixed in by the axial groove 137 in it rocking arm the lower end in, and its stroke is equal to or slightly greater than the distance between the not operation surperficial 145 and operating surface 140 on the driven plunger.After spool 160 moved down, driven plunger 164 just can be under the oil pressure effect, and the load that overcomes spring 156 moves right, and rests on the spring seat 158.At this moment, the upper surface 146 of spool 160 contacts with the operating surface 140 of driven plunger, forms the solid link, and the driving mechanism 100 of engine braking is in operating position, "open" state just shown in Figure 5.The small boss 232 of brake cam 2302 and 233 motions that produced by brake rocker arm 2102, driven plunger 164, spool 160 and exhasut valve stem link 116, are delivered to outlet valve 300, produce engine braking.When not needing engine braking, the engine braking control mechanism cuts out draining, and driven plunger is not subjected to oil pressure, to moving to left, rests on the left side of horizontal hole under the effect of spring.Spool is upwards moved by acting in the hole of brake spring, gets back to off position, 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, 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 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 utility model is 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 utility model and principle the utility model made amendment and change.For instance, illustrated or certain part of functions described of concrete mechanism can be used for another concrete mechanism, and then obtains a new mechanism.Therefore, the utility model will comprise above-mentioned modification and change, as long as they belong within appended claim or the scope suitable with requirement power.
Claims (10)
1. the engine braking apparatus of a fast braking, constitute by an outlet valve control mechanism, it is characterized in that: described outlet valve control mechanism is by the driving force input cam; rocking arm and pitman arm shaft constitute; rocking arm one end is provided with a vertical hole and a horizontal hole; vertically the upper end, hole is intersected with described horizontal hole and is three-port structure; be provided with spool in the described vertical hole; be provided with driven plunger in the described horizontal hole; described driven plunger middle part is provided with annular groove; be connected for liquid sealing between the outer side wall of described driven plunger the inner and the described horizontal hole; be provided with liquid sealing between the outer side wall of described spool and the described vertical hole and be connected; described driving force input cam mechanism is arranged on the other end of rocking arm, and rocking arm is arranged on the pitman arm shaft.
2. the engine braking apparatus of fast braking as claimed in claim 1, it is characterized in that: the middle part outer wall of described spool is provided with axial grooving, described vertical hole lower end edge radially is set with a pin, one end of described pin extends in the axial grooving of described spool, described driven plunger the inner is provided with axial blind hole, is provided with oilhole between described axial blind hole bottom and the described annular groove.
3. the engine braking apparatus of fast 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 horizontal hole.
4. the engine braking apparatus of fast braking as claimed in claim 1, it is characterized in that: described spool lower end is fixed with an end of spring, on described rocking arm, described spool upper-end surface contacts with the annular groove at described driven plunger middle part the described spring the other end by bolt.
5. the engine braking apparatus of fast braking as claimed in claim 1, it is characterized in that: be fixed with a spring seat that stretches out described rocking arm in described horizontal hole outer end, be provided with another spring between described driven plunger outer end and the described spring seat.
6. the engine braking apparatus of fast braking as claimed in claim 1, it is characterized in that: the axial cross section of described annular groove is inner edge and is shorter than the trapezoidal of outside, it is axially vertical with described driven plunger that described annular groove is positioned at the side of described driven plunger outer end, and the side that described annular groove is positioned at described driven plunger the inner is the plane of inclination.
7. the engine braking apparatus of fast braking as claimed in claim 5, it is characterized in that: described driven plunger outer end is provided with axial blind hole, described another spring one end is arranged in the described blind hole, described spring seat is the cylinder barrel shaped with annular exterior edge face, the annular exterior edge face of described spring seat is provided with location cylinder along its axial direction, and the length of described location cylinder is more than or equal to the length of the blind hole of described driven plunger outer end.
8. the engine braking apparatus of fast braking as claimed in claim 1, it is characterized in that: the upper surface of described spool is a cylndrical surface, is complementary with the outer side wall of described driven plunger the inner.
9. the engine braking apparatus of fast 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. the engine braking apparatus of fast braking as claimed in claim 1 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 (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920208709 CN201679528U (en) | 2009-08-31 | 2009-08-31 | Fast braking engine braking gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920208709 CN201679528U (en) | 2009-08-31 | 2009-08-31 | Fast braking engine braking gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201679528U true CN201679528U (en) | 2010-12-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200920208709 Expired - Lifetime CN201679528U (en) | 2009-08-31 | 2009-08-31 | Fast braking engine braking gear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201679528U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100170472A1 (en) * | 2009-01-05 | 2010-07-08 | Zhou Yang | Integrated engine brake with mechanical linkage |
| CN102003239B (en) * | 2009-08-31 | 2012-11-28 | 上海尤顺汽车部件有限公司 | Quick-braking engine brake device |
| CN103470330A (en) * | 2010-05-27 | 2013-12-25 | 上海尤顺汽车部件有限公司 | Valve actuating system of engine and method for generating engine auxiliary valve lift curve |
| CN103470328A (en) * | 2010-05-27 | 2013-12-25 | 上海尤顺汽车部件有限公司 | Fixed chain type mechanism and method for producing auxiliary valve rise curve of engine |
| CN103470329A (en) * | 2010-05-27 | 2013-12-25 | 上海尤顺汽车部件有限公司 | Valve actuating system of engine and method for generating engine auxiliary valve lift curve |
-
2009
- 2009-08-31 CN CN 200920208709 patent/CN201679528U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100170472A1 (en) * | 2009-01-05 | 2010-07-08 | Zhou Yang | Integrated engine brake with mechanical linkage |
| CN102003239B (en) * | 2009-08-31 | 2012-11-28 | 上海尤顺汽车部件有限公司 | Quick-braking engine brake device |
| CN103470330A (en) * | 2010-05-27 | 2013-12-25 | 上海尤顺汽车部件有限公司 | Valve actuating system of engine and method for generating engine auxiliary valve lift curve |
| CN103470328A (en) * | 2010-05-27 | 2013-12-25 | 上海尤顺汽车部件有限公司 | Fixed chain type mechanism and method for producing auxiliary valve rise curve of engine |
| CN103470329A (en) * | 2010-05-27 | 2013-12-25 | 上海尤顺汽车部件有限公司 | Valve actuating system of engine and method for generating engine auxiliary valve lift curve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20101222 Effective date of abandoning: 20090831 |
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| RGAV | Abandon patent right to avoid regrant |