CN2731436Y - Fatigue tester for bush of engine - Google Patents
Fatigue tester for bush of engine Download PDFInfo
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- CN2731436Y CN2731436Y CN 200420107444 CN200420107444U CN2731436Y CN 2731436 Y CN2731436 Y CN 2731436Y CN 200420107444 CN200420107444 CN 200420107444 CN 200420107444 U CN200420107444 U CN 200420107444U CN 2731436 Y CN2731436 Y CN 2731436Y
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Abstract
The utility model relates to a fatigue tester for bush of engine in mechanical field. The utility model comprises a machine frame, a hydraulic cylinder loading device, a main supporting, a test main shaft, a main bush, a test box cover, a test bush, a fly wheel diaphragm coupling assembly, a frequency conversion electrical motor, a pressure gauge frame, a main supporting cover, and a first thermocouple. The output shaft of the frequency conversion electrical motor is connected with the fly wheel diaphragm coupling assembly in key-type, and one end of the test main shaft is clamped with the fly wheel diaphragm coupling assembly and is supported in the main supporting hole through the main bush and then is fastened to the main supporting through the main supporting cover; the main supporting cover is provided with the first thermocouple through the inner small hole, and the top end of the first thermocouple is contacted with the main bush; the main supporting is connected with the machine frame, and the pressure gauge frame is welded with the machine frame, and the main supporting is provided with a main bush lubricating oil-in hole and an oil-in path; the test bush is arranged in the middle of the test main shaft and is connected with the underlying hydraulic cylinder loading device, and the test box cover is connected with the surrounded supporting plates on the machine frame in convex-concave matching form. The utility model is simple in structure, convenient in loading, and reliable in operation.
Description
Technical field
The utility model relates to a kind of testing machine of mechanical field, specifically is a kind of engine bearing fatigue tester.
Background technology
Bearing shell is a crucial friction quick-wear part in the engine, the height of bearing shell fatigue strength has directly influenced the strong degree that carries of engine, the damage of bearing shell is not only relevant with the performance of bearing alloy and coating, also be subjected to the influence of bearing shell actual working conditions, so, use general Material Testing Machine can not accurately measure the fatigue strength of bearing shell, and on engine, make straightway testing, not only test period is long, testing expenses are expensive, nor easily understands fully the influence of various complicated factors in the engine.As bearing shell or bush material production unit, be starved of a kind of special-purpose testing machine that is used to measure engine bearing fatigue strength.
Find by literature search, what Deping etc. are in " naval vessel science and technology " (in January, 1997, the 25th page) set forth a kind of difunctional bearing shell Research and development of test-bed, this bearing shell testing machine is by main drive motor, transmission case, hydraulic jack, bearing seat, body, oil supply systems etc. partly constitute, main drive motor is positioned at the body right part, it is a kind of commutator stepless change AC motor, transmission case is positioned at body upper, be provided with 4 retaining geared rotor system and crankshaft connecting rod systems in the case, the run-in synchronism of 2 output shafts of control, turning axle is supported by the bearing seat of the right section of hydraulic cylinder, having one section off-centre (eccentric throw is 0.7mm) to be used for the drive link piston set in the middle of the rotating shaft moves back and forth in hydraulic cylinder, axis of swing is supported by the bearing seat of hydraulic cylinder left side section, because this testing machine is equipped with turning axle, axis of swing two sleeves system, the test bearing shell is sub-packed in turning axle, on the axis of swing, can be rotated simultaneously watt, the swing watt Stromeyer test, oil supply system is positioned at underpart, it comprises oil pump, filtrator, well heater, refrigeratory, annexes such as fuel tank, hydraulic jack is positioned at body upper, by cylinder body, double-piston connecting rod assembly, the inlet valve group, compositions such as draining pressure regulator valve.The hydraulic jack of this testing table only can be realized unidirectional loading, and the load that promptly is applied on the test bearing shell is the half-wave pulse type.
Summary of the invention
The purpose of this utility model is at deficiency of the prior art, a kind of engine bearing fatigue tester is provided, make it be used for engine bearing fatigue strength and measure, can realize that unidirectional loading and two-way loading are that test load can be elected half-wave pulse type and near sinusoidal wave impulse type as the test bearing shell.Have one section off-centre (eccentric throw is 0.4mm) to be used for the drive link piston set in the middle of the main frame test main shaft and move back and forth in hydraulic cylinder, test main shaft one end is by the output shaft direct connection of integrated flywheel diaphragm spring coupling assembly and ac variable-frequency electric motor.
The utility model is realized according to following technical scheme; the utility model comprises: frame; the hydraulic cylinder charger; main supporting; the test main shaft; main bearing shell; the test case lid; the test bearing shell; flywheel diaphragm coupling assembly; variable-frequency motor; the pressure dial framework; main supporting lid; first thermopair; the output shaft of variable-frequency motor is connected with flywheel diaphragm coupling assembly key; one end and the flywheel diaphragm coupling assembly of test main shaft pass through screws clamp; the test main shaft is bearing in the hole of main supporting by four main bearing shells; fastening through two main supporting lids with main supporting, cover by aperture in it in main supporting and to be provided with four first thermopairs, the top of first thermopair contacts with the Shang watt watt back of the body of main bearing shell; main supporting is connected with frame; the welding of pressure dial framework and frame offers lubricated oil supply hole of corresponding main bearing shell and oil input channel in main supporting, the test bearing shell is contained in the middle of the test main shaft one section shaft part that 0.4mm off-centre arranged and links to each other with following hydraulic cylinder charger; the test case lid is a protection case, and being connected for convex-concave between the support plate all around on the frame.
The hydraulic cylinder charger comprises: the cylinder seat, retaining valve, O-ring seal, first, second hydraulic fitting, resistance strain gage, second thermopair, connecting rod cap, connecting rod, cylinder cap, piston pin, cylinder sleeve, piston, tensimeter, pressure valve, overflow adapter, hydraulic tube, its connected mode is: post four resistance strain gages on the shaft of connecting rod, the lower end of connecting rod links together by piston pin and piston, has three road annular grooves on the outside cylinder of piston, is provided with three O shape hydraulic seal circles in it, it between piston and the cylinder sleeve clearance fit, between cylinder sleeve and the main supporting is transition fit, is provided with an O-ring seals therebetween, and the bottom surface that the cylinder seat is pushed down cylinder sleeve by O-ring seals uses studs fastening with main supporting, cylinder cap is connected with cylinder sleeve, be provided with O-ring seals in the cylinder cap, cylinder cap is provided with three first hydraulic fittings, is provided with four retaining valves in the cylinder seat, the cylinder seat is connected with the seat board of pressure valve by hydraulic tube, pressure valve is connected with its seat board, and overflow adapter is connected with the seat board of pressure valve, and tensimeter is fixed in the pressure dial framework, tensimeter is connected with the pressure tap of pressure valve by the pressure measurement flexible pipe, by its interior one oblique aperture second thermopair is set at link rod head, the top of second thermopair with the test bearing shell a following watt of watt back of the body contact, on connecting rod cap by second hydraulic fitting that is threaded.
Constitute between cylinder cap, piston, the cylinder sleeve three and go up LOADED CAVITY, constitute LOADED CAVITY down between cylinder seat, piston, the cylinder sleeve three.Cylinder cap is provided with three first hydraulic fittings for oil-feed and oil return, is provided with retaining valve in its oil-feed oil circuit, is provided with the back pressure pressure valve in its oil return circuit.Clearance fit between the stomidium under piston pin and the connecting rod, transition fit between piston pin and the piston, the two ends of piston hole inner carrier pin install the hole back-up ring additional.Adopt flywheel diaphragm coupling assembly direct connection between the output shaft of test main shaft and variable-frequency motor.
The test case lid is a protection case; during test; the test case lid makes the hydraulic cylinder charger on the cover, main supporting; the test main shaft; main bearing shell, the test bearing shell, flywheel diaphragm coupling assembly etc. is in the space of a sealing; prevent from the process of the test to occur outwards spattering that oil or foreign fall into etc., play the certain protection effect.
During the utility model work, start the lube oil pump on the hydraulic pressure oil pump station earlier, lubricating oil is provided for main bearing shell and test bearing shell, when lubrication pressure reaches normal value, start variable-frequency motor, the output shaft of variable-frequency motor rotates by flywheel diaphragm coupling assembly motoring ring test main shaft, because one section off-centre that 0.4mm is arranged in the middle of the test main shaft, so the test main shaft is again by connecting rod, piston pin, it is reciprocating in cylinder sleeve to drive piston; When the rotating speed of test main shaft reaches setting value, start following loading oil pump and last loading oil pump on the hydraulic pressure oil pump station, regulate the magnitude of back pressure of pressure valve, when piston moves in cylinder sleeve from lower to upper, vacuum appears in the following LOADED CAVITY, the hydraulic oil that following loading oil pump provides enters down LOADED CAVITY through retaining valve, when piston moves in cylinder sleeve from top to bottom, closed check valve, fluid in the following LOADED CAVITY produces high pressure by compression, the back pressure restriction that valve is set up that is stressed of pressure size, and this pressure is again through piston, piston pin, connecting rod acts on following watt that tests bearing shell, the test main shaft whenever turns around, and following watt of the test bearing shell just is subjected to pulsatile once load; Equally, when piston moves in cylinder sleeve from top to bottom, vacuum appears in the last LOADED CAVITY, the hydraulic oil that last loading oil pump provides enters LOADED CAVITY through another retaining valve, when piston moves in cylinder sleeve from lower to upper, this closed check valve, fluid in the last LOADED CAVITY produces high pressure by compression, the back pressure that the pressure size is set up by another pressure valve limits, this pressure again through piston, piston pin, connecting rod act on the test bearing shell Shang watt on, the test main shaft whenever turns around, the test bearing shell Shang watt just be subjected to pulsatile once load; Acting on the magnitude of load of test on the bearing shell can convert by the resistance variations (be converted into voltage signal by electric bridge, carry out the signal processing and amplifying through dynamic resistance strain instrument) that mensuration is attached to resistance strain gage on the connecting rod and try to achieve.Like this, by regulating the size of pressure valve back pressure, just can change the load that the test bearing shell is subjected to.The torture test of bearing shell can be used " increment of load method ", promptly every increase one-level load, and the testing machine operation regular hour, shutdown inspection test bearing shell has or not the generation fatigure failure then, if the test bearing shell does not have fatigue, then increases one-level load again, proceeds test.In the process of the test, can also be by second thermocouple monitoring test bearing shell watt back of the body variation of temperature, when test bearing shell generation fatigue or interlock, a watt back of the body temperature sharply rises, when a watt back of the body temperature surpasses setting value, the testing machine auto stop.Test the fatigue strength that the load that is applied to when fatigue takes place bearing shell on bearing shell is this kind bush material.
Hydraulic cylinder charger of the present utility model can realize testing the half-wave pulse loading of bearing shell and the pulse load mode of near sinusoidal waveform, adopt flywheel diaphragm elastic coupling direct connection between the output shaft of test main shaft and variable-frequency motor, simple in structure, reliable operation.
Description of drawings
Fig. 1 the utility model structural representation
Fig. 2 the utility model hydraulic cylinder charger structural representation
Embodiment
As Fig. 1, shown in Figure 2, the utility model comprises: frame 1, hydraulic cylinder charger 2, main supporting 3, test main shaft 4, main bearing shell 5, test case lid 6, test bearing shell 7, flywheel diaphragm coupling assembly 8, variable-frequency motor 9, pressure dial framework 10, main supporting covers 19, wherein hydraulic cylinder charger 2 comprises: cylinder seat 11, retaining valve 12, O-ring seal 13,14,15,16,33, hydraulic fitting 17,21, resistance strain gage 18, thermopair 20,23, connecting rod cap 22, connecting rod 24, cylinder cap 25, piston pin 26, cylinder sleeve 27, piston 28, tensimeter 29, pressure valve 30, overflow adapter 31, hydraulic tube 32.The output shaft of variable-frequency motor 9 is connected with flywheel diaphragm coupling assembly 8 keys, one end and the flywheel diaphragm coupling assembly 8 of test main shaft 4 is connected by screws clamp, test main shaft 4 is bearing in by four main bearing shells 5 in the hole of main supporting 3, through two main supportings cover 19 by eight studs with main support 3 fastening; Test bearing shell 7 is contained in the upper end semicircle orifice of connecting rod 24, and is fastening by two studs with connecting rod cap 22; Post four resistance strain gages 18 on the shaft of connecting rod 22; The lower end of connecting rod 22 links together by piston pin 26 and piston 28, wherein, clearance fit between the stomidium under piston pin 26 and the connecting rod, transition fit between piston pin 26 and the piston 28, for preventing the axial motion of piston pin 26, install the hole back-up ring additional at the two ends of piston 28 hole inner carrier pins 26; Having 3 road annular grooves on the outside cylinder of piston 28, be provided with three O shape hydraulic seal circles 13 in it, is clearance fit between piston 28 and the cylinder sleeve 27; Between cylinder sleeve 28 and the main supporting 3 is transition fit, is provided with 1 O-ring seals 14 therebetween; Cylinder seat 11 is fastening with master's supporting 3 with studs by the bottom surface of pushing down cylinder sleeve 27 with individual O-ring seals 33; Between cylinder cap 25 and the cylinder sleeve 27 for being threaded, be provided with O-ring seals 16 in the cylinder cap 25, cylinder cap 25 is provided with 3 hydraulic fittings 17 for oil-feed and oil return, in its oil-feed oil circuit, be provided with retaining valve, in its oil return circuit, be provided with the back pressure pressure valve, constitute between cylinder cap 25, piston 28, cylinder sleeve 27 threes and go up LOADED CAVITY; Be provided with four retaining valves 12 in the cylinder seat 11, constitute LOADED CAVITY down between cylinder seat 11, piston 28, cylinder sleeve 27 threes; Be threaded between the seat board of cylinder seat 11 by hydraulic tube 32 and pressure valve 30, be threaded between pressure valve 30 and its seat board, be threaded between the seat board of overflow adapter 31 and pressure valve 30, tensimeter 29 is fixed in the pressure dial framework 10, and tensimeter 29 is threaded by the pressure tap of pressure measurement flexible pipe with pressure valve 30; Pressure dial framework 10 and frame 1 welding; Be connected with bolt between main supporting 3 and the frame 1, be provided with O-ring seals 15 between its surface of contact; Cover on 19 in main supporting and to be provided with four thermopairs 20 by aperture in it, the top of thermopair 20 contacts with the Shang watt watt back of the body of main bearing shell 5; Also be provided with 1 thermopair 23 by its interior one oblique aperture at connecting rod 24 heads, the top of thermopair 23 contacts with a following watt of watt back of the body of test bearing shell 7; Hydraulic fitting 21 by being threaded and using for the lubricated oil-feed of test bearing shell on connecting rod cap 22 also offers corresponding main bearing shell 5 lubricated oil supply hole and oil input channels in main supporting 3.Test case lid 6 is protection cases, and being connected for convex-concave between the support plate all around on the frame 1.
Claims (7)
1; a kind of engine bearing fatigue tester; comprise: frame (1); hydraulic cylinder charger (2); main supporting (3); test main shaft (4); main bearing shell (5); test case lid (6); test bearing shell (7); variable-frequency motor (9); pressure dial framework (10); main supporting lid (19); thermopair (20); it is characterized in that; also comprise: flywheel diaphragm coupling assembly (8); the output shaft of variable-frequency motor (9) is connected with flywheel diaphragm coupling assembly (8) key; one end and the flywheel diaphragm coupling assembly (8) of test main shaft (4) pass through screws clamp; test main shaft (4) is bearing in the hole of main supporting (3) by four main bearing shells (5); fastening through two main supporting lids (19) with main supporting (3); upward be provided with four thermopairs (20) at main supporting lid (19) by aperture in it; the top of thermopair (20) contacts with the Shang watt watt back of the body of main bearing shell (5); main supporting (3) is connected with frame (1); pressure dial framework (10) and frame (1) welding; in main supporting (3), offer lubricated oil supply hole of corresponding main bearing shell (5) and oil input channel; test bearing shell (7) is contained in shaft part in the middle of test main shaft (4) and links to each other with following hydraulic cylinder charger (2), and test case lid (6) is a protection case, and being connected for convex-concave between the support plate all around on the frame (1).
2, engine bearing fatigue tester according to claim 1, it is characterized in that, hydraulic cylinder charger (2) comprising: cylinder seat (11), retaining valve (12), O-ring seal (13,14,15,16,33), hydraulic fitting (17), (21), resistance strain gage (18), thermopair (23), connecting rod cap (22), connecting rod (24), cylinder cap (25), piston pin (26), cylinder sleeve (27), piston (28), tensimeter (29), pressure valve (30), overflow adapter (31), hydraulic tube (32), its connected mode is: post four resistance strain gages (18) on the shaft of connecting rod (22), the lower end of connecting rod (22) links together by piston pin (26) and piston (28), on the outside cylinder of piston (28), have three road annular grooves, be provided with three O shape hydraulic seal circles (13) in it, between piston (28) and the cylinder sleeve (27) is clearance fit, between cylinder sleeve (28) and the main supporting (3) is transition fit, be provided with an O-ring seals (14) therebetween, the bottom surface that cylinder seat (11) is pushed down cylinder sleeve (27) by O-ring seals (33) uses studs fastening with main supporting (3), and cylinder cap (25) is connected with cylinder sleeve (27), is provided with O-ring seals (16) in the cylinder cap (25), cylinder cap (25) is provided with three hydraulic fittings (17), be provided with four retaining valves (12) in the cylinder seat (11), cylinder seat (11) is connected with the seat board of pressure valve (30) by hydraulic tube (32), and pressure valve (30) is connected with its seat board, overflow adapter (31) is connected with the seat board of pressure valve (30), tensimeter (29) is fixed in the pressure dial framework (10), and tensimeter (29) is connected by the pressure tap of pressure measurement flexible pipe with pressure valve (30), is provided with thermopair (23) at connecting rod (24) head by its interior one oblique aperture, the top of thermopair (23) contacts with a following watt of watt back of the body of test bearing shell (7), goes up by the hydraulic fitting that is threaded (21) at connecting rod cap (22).
3, engine bearing fatigue tester according to claim 2 is characterized in that, constitutes between cylinder cap (25), piston (28), cylinder sleeve (27) three and goes up LOADED CAVITY, constitutes LOADED CAVITY down between cylinder seat (11), piston (28), cylinder sleeve (27) three.
4, engine bearing fatigue tester according to claim 2, it is characterized in that, cylinder cap (25) is provided with three first hydraulic fittings (17) for oil-feed and oil return, is provided with retaining valve in its oil-feed oil circuit, is provided with the back pressure pressure valve in its oil return circuit.
5, engine bearing fatigue tester according to claim 2, it is characterized in that, clearance fit between the stomidium under piston pin (26) and the connecting rod, transition fit between piston pin (26) and the piston (28), the two ends of piston (28) hole inner carrier pin (26) install the hole back-up ring additional.
6, engine bearing fatigue tester according to claim 1 is characterized in that, passes through flywheel diaphragm coupling assembly (8) direct connection between the output shaft of test main shaft (4) and variable-frequency motor (5).
7, engine bearing fatigue tester according to claim 1 is characterized in that, test bearing shell (7) is contained in the middle of test main shaft (4) one section shaft part that 0.4mm off-centre arranged and links to each other with following hydraulic cylinder charger (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420107444 CN2731436Y (en) | 2004-10-21 | 2004-10-21 | Fatigue tester for bush of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420107444 CN2731436Y (en) | 2004-10-21 | 2004-10-21 | Fatigue tester for bush of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2731436Y true CN2731436Y (en) | 2005-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420107444 Expired - Fee Related CN2731436Y (en) | 2004-10-21 | 2004-10-21 | Fatigue tester for bush of engine |
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| CN (1) | CN2731436Y (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519787A (en) * | 2012-01-13 | 2012-06-27 | 中国重汽集团济南动力有限公司 | Simulation cylinder head for pulse test of engine body of engine |
| CN104897379A (en) * | 2015-03-26 | 2015-09-09 | 欧阳光耀 | Diesel engine bearing bush detection device |
| CN106370591A (en) * | 2016-08-24 | 2017-02-01 | 上海交通大学 | Test machine for lubrication and friction and abrasion features of bearing bush |
| CN108776016A (en) * | 2018-09-13 | 2018-11-09 | 河南柴油机重工有限责任公司 | A kind of connecting rod fatigue experimental device that reliability is high |
| CN109975006A (en) * | 2019-05-07 | 2019-07-05 | 哈尔滨工程大学 | A kind of vertical low speed machine connecting rod bearing shell fatigue test platform machine |
| CN110160784A (en) * | 2019-05-14 | 2019-08-23 | 西北工业大学 | A kind of sliding bear experiment device of adjustable eccentric |
| CN110289737A (en) * | 2019-08-13 | 2019-09-27 | 南京汽轮电机(集团)有限责任公司 | A kind of generator bearing shell protective device |
| CN110374960A (en) * | 2019-05-07 | 2019-10-25 | 哈尔滨工程大学 | A kind of Bearing Fatigue Testing Machine hydraulic control system of actuated by cams proportional pressure control valve |
| CN113702040A (en) * | 2021-09-17 | 2021-11-26 | 中国北方发动机研究所(天津) | Engine main bearing bush test bed for simulating real bearing load state |
| CN113959934A (en) * | 2021-10-22 | 2022-01-21 | 重庆跃进机械厂有限公司 | Bearing bush cavitation resistance testing device and testing method |
-
2004
- 2004-10-21 CN CN 200420107444 patent/CN2731436Y/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519787A (en) * | 2012-01-13 | 2012-06-27 | 中国重汽集团济南动力有限公司 | Simulation cylinder head for pulse test of engine body of engine |
| CN104897379A (en) * | 2015-03-26 | 2015-09-09 | 欧阳光耀 | Diesel engine bearing bush detection device |
| CN106370591A (en) * | 2016-08-24 | 2017-02-01 | 上海交通大学 | Test machine for lubrication and friction and abrasion features of bearing bush |
| CN108776016B (en) * | 2018-09-13 | 2023-12-19 | 河南柴油机重工有限责任公司 | Connecting rod fatigue test device with high reliability |
| CN108776016A (en) * | 2018-09-13 | 2018-11-09 | 河南柴油机重工有限责任公司 | A kind of connecting rod fatigue experimental device that reliability is high |
| CN109975006A (en) * | 2019-05-07 | 2019-07-05 | 哈尔滨工程大学 | A kind of vertical low speed machine connecting rod bearing shell fatigue test platform machine |
| CN110374960A (en) * | 2019-05-07 | 2019-10-25 | 哈尔滨工程大学 | A kind of Bearing Fatigue Testing Machine hydraulic control system of actuated by cams proportional pressure control valve |
| CN109975006B (en) * | 2019-05-07 | 2024-10-01 | 哈尔滨工程大学 | Vertical low-speed machine connecting rod tile fatigue test platform machine |
| CN110374960B (en) * | 2019-05-07 | 2024-08-20 | 哈尔滨工程大学 | Hydraulic control system of bearing bush fatigue testing machine of cam driven proportional overflow valve |
| CN110160784A (en) * | 2019-05-14 | 2019-08-23 | 西北工业大学 | A kind of sliding bear experiment device of adjustable eccentric |
| CN110289737A (en) * | 2019-08-13 | 2019-09-27 | 南京汽轮电机(集团)有限责任公司 | A kind of generator bearing shell protective device |
| CN110289737B (en) * | 2019-08-13 | 2024-04-19 | 南京汽轮电机集团电站设备技术服务有限公司 | Generator bearing bush protection device |
| CN113702040A (en) * | 2021-09-17 | 2021-11-26 | 中国北方发动机研究所(天津) | Engine main bearing bush test bed for simulating real bearing load state |
| CN113959934B (en) * | 2021-10-22 | 2023-06-16 | 重庆跃进机械厂有限公司 | Bearing bush cavitation resistance test device and test method |
| CN113959934A (en) * | 2021-10-22 | 2022-01-21 | 重庆跃进机械厂有限公司 | Bearing bush cavitation resistance testing device and testing method |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |