JP2007085278A - Oil pump structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide oil pump structure in which an oil passage in an engine case is formed by small work. <P>SOLUTION: The oil pump structure comprises an oil pump 45, a pump housing 49 housing the oil pump 45, and a pump drive shaft 53 driving the oil pump 45. An oil suction passage 70 and an oil delivery passage 71 are integrally formed in the pump housing 49 so that they are in parallel with the pump drive shaft 53, an oil inlet passage 65 is formed integrally with the engine case 21b, and the pump housing 49 is attached to the engine case 21b to connect the oil inlet passage 65 with the oil delivery passage 71. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an oil pump structure.

  Since an engine mounted on a vehicle such as a motorcycle has a large number of sliding parts and rotating parts, lubricating oil is supplied to each part using a lubricating device, and the frictional resistance of each part is reduced by the action of the lubricating oil. It has been reduced so that the engine functions fully. In addition, there is a type in which each part of the engine is actively cooled with lubricating oil.

  For example, a general lubrication oil path of a lubrication system for a four-cycle engine adopting a wet sump method is such that the lubrication oil stored in an oil pan provided at the lower part of the engine case of the engine is sucked up by an oil pump, After being filtered by an oil filter and cooled by an oil cooler in some cases, it is sent to each lubricating part in the engine via a main gallery formed in the engine case.

  The oil passage from the oil pump to the main gallery is generally formed in the engine case (see, for example, Patent Document 1).

  On the other hand, there is an engine case in which a housing for accommodating an oil pump and an oil chamber is formed, and an oil passage is formed in the oil chamber (see, for example, Patent Document 2).

By the way, in recent years, there has been a demand for shortening the longitudinal length of the engine for the purpose of shortening the wheelbase and improving the turning performance, and concentrating the mass. Some engine cases have a steep slope on the mating surface, and the shafts arranged on the mating surface have a close front-to-back spacing. In addition, among the shafts, for example, there is a method of further shortening the longitudinal length of the engine by disposing the drive shaft as a cassette type below the counter shaft from the vehicle width direction.
JP 2001-227317 A Japanese Patent No. 2971769

  However, in the engine having the above structure, since the drive shaft is a cassette type and is disposed close to the crankshaft, there is almost no sagging existing in the lower part of the engine case, and there is no wall for oil passage formation.

  The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide an oil pump structure in which oil passage machining applied to an engine case is reduced.

  In order to solve the above-described problems, an oil pump structure according to the present invention includes an oil pump, a pump housing in which the oil pump is accommodated, and a pump drive that drives the oil pump. An oil intake passage and an oil discharge passage are formed integrally with the pump housing in parallel with the pump drive shaft, and an oil inflow passage is formed integrally with the engine case, and the pump housing is attached to the engine case. The oil inflow passage and the oil discharge passage are connected to each other.

  In order to solve the above-mentioned problem, as described in claim 2, a substantially U-shaped communication is established between the oil suction passage, the oil discharge passage, and a pump chamber formed inside the pump housing. In addition to forming a structure, an oil inlet of the oil suction passage and an oil outlet of the oil discharge passage are provided on the opposite side of the pump housing from the oil pump.

  Furthermore, in order to solve the above-described problem, as described in claim 3, an oil pan is attached to the lower portion of the engine case, and the left and right sides of the oil pan in the vehicle width direction are extended downward. The pump in which an extension portion is formed and an oil inlet of the oil suction passage and an oil outlet of the oil discharge passage are arranged above the lower extension portion, and the oil suction passage and the oil discharge passage are formed The oil pump is arranged on one side in the vehicle width direction of the housing, the cooling water pump is arranged on the other side, and the pump driving shaft of the cooling water pump is coaxially arranged with the pump driving shaft and is integrally rotated. .

  Furthermore, in order to solve the above-mentioned problem, as described in claim 4, an oil relief valve is provided in the middle of the oil discharge passage of the pump housing.

  According to the oil pump structure of the present invention, the oil passage machining applied to the engine case can be reduced, so that the engine case can be made compact and the assembling property and the sealing property can be improved. Further, a passage formed in the engine case and communicating with the oil pump can be disposed at a position where it does not interfere with the oil pump. Furthermore, it is possible to reduce the suction resistance of the lubricating oil.

  Furthermore, interference between the cooling water pump and the clutch cover can be avoided, and the cooling water pump can be driven with a simple structure.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a left side view showing an example of a motorcycle to which the present invention is applied. As shown in FIG. 1, the motorcycle 1 has a body frame 2, and a head pipe 3 is provided at the front end thereof. The head pipe 3 includes a front cushion unit (not shown) and is provided with a steering mechanism 7 including a pair of left and right front forks 5 and a handle bar 6 that rotatably support the front wheel 4. 4 is steered so as to be pivotable to the left and right.

  The body frame 2 is, for example, a twin-tube type, and is mainly expanded in the left-right direction immediately after the head pipe 3 and immediately after the head pipe 3, and then extends downward and obliquely downward in parallel to each other. A pair of left and right main frames 8 extending downward, and a pair of left and right seat rails 9 attached to the rear bent portion of the main frame 8 and extending rearward.

  A fuel tank 10 is disposed above the main frame 8, and an operation seat 11 is disposed above the seat rail 9 so as to be detachable or openable. Further, the front end of the rear swing arm 13 is pivotably mounted between the left and right swing arm pivot shaft support portions 12, and the rear wheel 14 is pivotally supported on the rear end of the rear swing arm 13. The Further, the swing arm 13 is supported at the base end portion of the swing arm 13 via the rear cushion unit 15 and the link member 16 so as to be cushioned up and down.

  On the other hand, an engine unit 17 is mounted below the main frame 8 at the center of the vehicle body between the front and rear wheels 4 and 14 and below the fuel tank 10. FIG. 2 is a left side view of the engine unit 17, most of which is shown in a vertical cross section. FIG. 3 is a right side view of the engine unit 17 and a part thereof is shown in a longitudinal section. 4 is a cross-sectional view taken along the line IV-IV in FIG. As shown in FIGS. 2 to 3, the engine unit 17 is a four-cycle parallel multi-cylinder engine. The outer shape mainly includes a head cover 18, a cylinder head 19, a cylinder block 20, an engine case 21, and an oil pan 22 from the top of the figure. Is configured.

  The engine case 21 is of a split type, and is composed of, for example, an upper upper engine case 21a that is divided into two in the vertical direction in the figure and in which the cylinder block 20 is integrally formed, and a lower engine case 21b below the upper engine case 21b.

  The cylinder block 20 is disposed upright and tilted forward, and the mating surfaces of the engine cases 21a and 21b are formed so as to be forwardly lowered (or rearwardly raised) perpendicular to the central axis of the cylinder block 20, and the lower surface of the lower engine case 21b. Similarly, the mating surface with the oil pan 22 is also formed to be forwardly lowered (or rearwardly raised).

  Bearing portions 23 are formed on the inner side of the mating surface of the upper engine case 21a and the lower engine case 21b, respectively, and are divided into upper and lower portions, and these bearing portions 23 extend in the width direction of the engine unit 17 from the front in the vehicle traveling direction. The next balancer shaft 24, the crankshaft 25, and the counter shaft 26 are rotatably supported. Although not shown in detail, a cassette type drive shaft 27 is inserted from the left side in the vehicle width direction and is disposed substantially below the counter shaft 26.

  A piston 28 is accommodated in the cylinder block 20 so as to be slidable in the vertical direction in FIG. The reciprocating stroke of the piston 28 is converted into a rotational motion by the crankshaft 25, and is composed of a clutch mechanism 29 and countershaft 26 provided at the right end of the countershaft 26, and a plurality of gear trains 30 provided on the driveshaft 27. It is transmitted to the rear wheel 14 which is a driving wheel through the drive chain 32 through the transmission mechanism 31.

  On the other hand, the air-fuel mixture supply means to the engine unit 17 used in the motorcycle 1 is a fuel injection type, and a throttle equipped with a fuel injector 34 in the intake port 33 of each cylinder formed on the rear side of the cylinder head 19. The body 35 is connected. The throttle body 35 includes a throttle valve 36 in its intake passage, and a fuel injector 34 that directly injects fuel is provided on the downstream side of the throttle valve 36. The throttle body 35 is disposed on the rear upper side of the engine unit 17, and an air cleaner 37 is connected to the upstream side of the throttle body 35.

  On the other hand, the exhaust port 38 of each cylinder that opens to the front side of the cylinder head 19 is connected to the upstream end of an exhaust pipe 39 (four in this embodiment), extends downward, and then folds backward. It is bent and assembled two by two at the front lower part of the engine unit 17 and one at the lower part of the engine unit 17 and extends rearward, and the exhaust expansion chamber 40 is connected to the downstream end thereof.

  Furthermore, the engine unit 17 is water-cooled, and a radiator 41 is disposed in front of the engine unit 17 and is connected to a cooling water pump 42 disposed on the left side of the lower engine case 21b via a cooling water hose (not shown). The

  In the motorcycle 1, the front portion of the vehicle body is covered with a streamlined cowling 43 to reduce air resistance during traveling and to protect the rider from traveling wind pressure.

  By the way, the engine unit 17 is provided with an engine lubrication device 44, and the lubricating oil stored in the oil pan 22 provided at the lower part of the lower engine case 21b passes through the oil filter 46 and the oil cooler 47 by the oil pump 45. Then, it is pumped to each part in the engine unit 17 such as the valve operating device 48 (see FIG. 2) disposed on the crankshaft 25 or the cylinder head 19 and the transmission mechanism 31.

  As shown in FIGS. 3 and 4, the oil pump 45 is disposed in a lower part of the lower engine case 21 b while being accommodated in the pump housing 49, and is chain-driven by the counter shaft 26. Specifically, a clutch mechanism 29 is provided at one end of the counter shaft 26, and a drive sprocket 50 is provided at the end of the drive shaft 27 on the opposite side of the clutch mechanism 29. A pump drive gear 51 is provided on the counter shaft 26 adjacent to the clutch mechanism 29 so as not to interfere with the drive sprocket 50. A part of the clutch mechanism 29 is exposed outward in the vehicle width direction, and the exposed portion is covered with the clutch cover 52.

  On the other hand, the oil pump 45 is provided with a pump drive shaft 53 parallel to the counter shaft 26, and a pump driven sprocket 54 is provided at the end of the pump drive shaft 53 on the clutch mechanism 29 side. The pump drive chain 55 is wound around the pump driven sprocket 54 and the pump drive gear 51, whereby the oil pump 45 is driven by the counter shaft 26.

  Further, a pump drive shaft 56 of the cooling water pump 42 is disposed coaxially with the pump drive shaft 53 at the end opposite to the pump driven sprocket 54 of the pump drive shaft 53 and is integrally rotated. Is driven by the countershaft 26 and the cooling water pump 42 is also driven.

  FIG. 5 is a bottom view of the lower engine case 21b, and shows the oil pan 22 in a disconnected state. 6 is a view taken in the direction of arrow VI in FIG. 5 and shows the front of the lower engine case 21b. 7 is a cross-sectional view taken along line VII-VII in FIG. 5, and FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. FIG. 9 is a cross-sectional view taken along line IX-IX in FIG.

  As shown in FIGS. 3 to 9, the front surface of the lower engine case 21b is formed orthogonal to the mating surface with the upper engine case 21a, and the mounting seat 57 for the oil filter 46 and the mounting seat 58 for the oil cooler 47 are formed on this surface. Are juxtaposed in the width direction of the engine unit 17. In the present embodiment, the mounting seat 57 of the oil filter 46 is disposed on the left side in the traveling direction of the vehicle, and the mounting seat 58 of the oil cooler 47 is disposed on the right side on the opposite side. 6 is a front view of the lower engine case 21b, the mounting seat 57 of the oil filter 46 is shown on the right side of the drawing, and the mounting seat 58 of the oil cooler 47 is shown on the left side of the drawing.

  Although not shown in detail, the oil filter 46 mounted on the mounting seat 57 of the oil filter 46 has a circular mounting surface, and an oil outlet (not shown) is provided at the center of the oil filter 46 around the oil outlet. An oil inlet (not shown) is formed, and a filter element 59 (see FIG. 2) is provided between the oil inlet and the oil outlet. An oil inlet 60 and an oil outlet 61 are disposed on the mounting seat 57 of the oil filter 46, and the oil outlet 61 is located at the center side and the oil inlet of the oil filter 46 corresponding to the oil outlet of the oil filter 46. Correspondingly, oil inlets 60 are respectively arranged on the outer peripheral side.

  On the other hand, the oil cooler 47 mounted on the mounting seat 58 of the oil cooler 47 also has a circular mounting surface (not shown in detail), and an oil inlet (not shown) is provided at the center of this oil inlet. An oil outlet (not shown) is formed in the periphery, and a water jacket (not shown) is provided between the oil inlet and the oil outlet. Also, an oil inlet 62 and an oil outlet 63 are disposed on the mounting seat 58 of the oil cooler 47, and the oil outlet 63 corresponds to the oil outlet of the oil cooler 47 on the outer peripheral side and the oil inlet of the oil cooler 47. Correspondingly, oil inlets 62 are respectively arranged on the center side.

  The oil outlet 61 connected to the oil outlet of the oil filter 46 and the oil inlet 62 connected to the oil inlet of the oil cooler 47 are communicated with each other by a communication passage 64 formed integrally with the lower engine case 21b. The communication passage 64 includes a main passage 64a disposed in parallel to the crankshaft 25 behind the mounting seats 57 and 58 of the oil filter 46 and the oil cooler 47, an oil outlet 61 of the main passage 64a and the oil filter 46, and oil. The connecting passages 64b and 64c are connected to the oil inlet 62 of the cooler 47. The connecting passages 64b and 64c form a mounting seat 57 for the oil filter 46 and a mounting seat 58 for the oil cooler 47. The lower engine case 21b is disposed orthogonal to the front surface and parallel to the mating surface of the lower engine case 21b and the upper engine case 21a.

  An oil inflow passage 65 formed integrally with the lower engine case 21b is orthogonal to the crankshaft 25 from an oil inlet 60 corresponding to the oil inlet of the oil filter 46 formed in the mounting seat 57 of the oil filter 46, And it is arrange | positioned toward back in parallel with the mating surface of the lower engine case 21b and the upper engine case 21a, and the upstream end opens downward.

  Similarly, an oil outflow passage 66 formed integrally with the lower engine case 21b is formed with respect to the crankshaft 25 from the oil outlet 63 corresponding to the oil outlet of the oil cooler 47, which is formed in the mounting seat 58 of the oil cooler 47. And arranged rearward in parallel with the mating surface of the lower engine case 21b and the upper engine case 21a.

  Further, a main gallery 67 integrally formed with the lower engine case 21 b is disposed below the crankshaft 25 and the oil inflow passage 65 in the width direction of the engine unit 17 in parallel with the crankshaft 25. The downstream end of the oil outflow passage 66 is connected to this. An oil supply path 68 extends from the main gallery 67 toward the bearing portion 23 of the crankshaft 25 provided inside the mating surface between the upper engine case 21a and the lower engine case 21b.

  10 is a top view of the pump housing 49 in which the oil pump 45 is accommodated, FIG. 11 is a right side view thereof, and FIG. 12 is a bottom view thereof. 13 is a sectional view taken along line XIII-XIII in FIG. 12, FIG. 14 is a sectional view taken along line XIV-XIV in FIG. 12, and FIG. 15 is a sectional view taken along line XV-XV in FIG.

  As shown in FIGS. 3, 4, and 10 to 15, the oil pump 45 is housed in a pump chamber 69 formed inside a pump housing 49, and an oil suction passage 70 and a discharge passage 71 are provided in the pump housing 49. 49 is formed integrally. The oil suction passage 70 and the discharge passage 71 are arranged in parallel with the crankshaft 25, the counter shaft 26, and the pump drive shaft 53, and the downstream end of the oil suction passage 70 and the upstream end of the discharge passage 71 are respectively connected to the pump chamber 69. By communicating, a substantially U-shaped communication structure is formed.

  An oil inlet 72 is formed at the upstream end of the oil suction passage 70, that is, on the side opposite to the oil pump 45 of the pump housing 49, and the downstream end of the oil strainer 73 is connected to the oil inlet 72. At the same time, an oil suction port 74, which is the upstream end of the oil strainer 73, extends toward the oil pan 22. The oil strainer 73 is provided to remove relatively large foreign matters in the lubricating oil.

  On the other hand, an oil outlet 75 is formed on the downstream end of the oil discharge passage 71, that is, on the opposite side of the pump housing 49 from the oil pump 45, so that the oil outlet 75 opens to the oil outlet 75. At the same time as the upstream end is connected, the pump housing 49 is also attached to the lower surface of the lower engine case 21b (see FIG. 9). A mounting seat 77 for the oil relief valve 76 is formed in the middle of the oil discharge passage 71, and when an oil pressure exceeding a specified level is generated by the oil pump 45, the excess oil is supplied to the oil pan 22. An oil relief valve 76 that recirculates to is attached (see FIG. 3).

  As described above, in the present embodiment, the four exhaust pipes 39 are gathered and unified under the engine unit 17, and the gathering portion 39a is on the side of the vehicle width direction clutch mechanism 29, in the present embodiment, the vehicle. It is biased to the right side in the direction of travel (see FIGS. 2 and 4). In order to ensure a sufficient capacity of the oil pan 22 while avoiding the gathering portion 39a of the exhaust pipe 39, the oil pan 22 is located on the left and right side in the vehicle width direction at a position adjacent to the gathering portion 39a. The left side extends downward in the direction of travel of the vehicle to form a downward extension 22a. That is, the gathering portion 39a of the exhaust pipe 39 and the downward extending portion 22a of the oil pan 22 are arranged side by side in the vehicle width direction. An oil inlet 72 of the oil suction passage 70 and an oil outlet 75 of the oil discharge passage 71 are disposed above the lower extension portion 22a of the oil pan 22, and the oil strainer 73 also extends downward of the oil pan 22. It is provided facing the portion 22a.

  Next, the operation of this embodiment will be described.

  When the engine unit 17 is started, the crankshaft 25 rotates and the rotation is transmitted to the counter shaft 26 and the drive shaft 27. Then, the rotation of the counter shaft 26 is transmitted to the pump drive shaft 53 by the pump drive chain 55, and the oil pump 45 is activated. At the same time, the cooling water pump 42 is also operated.

  When the oil pump 45 is operated, the lubricating oil stored in the oil pan 22 is guided to the pump chamber 69 of the pump housing 49 through the oil strainer 73 and the oil inlet 72 of the oil suction passage 70. The lubricating oil guided to the pump chamber 69 is pumped by the oil pump 45 toward the oil outlet 75 of the oil discharge passage 71.

  Lubricating oil exiting from the oil outlet 75 is guided to the oil filter 46 through an oil inflow passage 65 formed integrally with the lower engine case 21b of the engine case 21, filtered inside thereof, and then integrally formed with the lower engine case 21b. It is led to the oil cooler 47 through the connected passage 64 and cooled.

  The lubricating oil cooled by the oil cooler 47 is guided to the main gallery 67 through an oil outflow passage 66 formed integrally with the lower engine case 21 b, and from the main gallery 67 through the oil supply path 68, the bearing portion of the crankshaft 25. 23, the sliding portion and the rotating portion inside the engine unit 17 are lubricated. Then, the lubricating oil that has lubricated each part is naturally dropped or returned to the oil pan 22 through an oil return passage (not shown) and circulated by the oil pump 45 again.

  An oil suction passage 70 and an oil discharge passage 71 are integrally formed in a pump housing 49 in which the oil pump 45 is accommodated in parallel with the pump drive shaft 53, so that these passages are integrated with the lower engine case 21 b of the engine case 21. The formation of the engine case 21 can be made compact because the lower engine case 21b does not need to be formed and no waste is required.

  Further, the oil inflow passage 65 is integrally formed in the lower engine case 21b, and the oil inflow passage 65 and the oil discharge passage 71 are connected by attaching the pump housing 49 to the lower engine case 21b. A passage communicating with the oil pump 45 can be used as an assembly. As a result, the assembling property is improved and the sealing property is also improved.

  Further, the oil suction passage 70, the oil discharge passage 71 and the pump chamber 69 form a substantially U-shaped communication structure, and the oil inlet 72 of the oil suction passage 70 and the oil pump 45 on the side opposite to the oil pump 45 of the pump housing 49. By providing the oil outlet 75 of the oil discharge passage 71, the passage communicating with the oil pump 45 can be disposed at a position where it does not interfere with the oil pump 45.

  Furthermore, the left and right sides of the oil pan 22 in the vehicle width direction extend downward to form a downward extension 22a, and the oil inlet 72 and the oil discharge of the oil suction passage 70 are formed above the downward extension 22a. By arranging the oil outlet 75 of the passage 71, the pump housing 49 can suck the lubricating oil linearly from the oil strainer 73, and as a result, the suction resistance can be reduced.

  Incidentally, in the engine unit 17 according to the present invention, the crankshaft 25, the countershaft 26 and the drive shaft 27 are arranged close to each other, and the engine case 21 is downsized. Therefore, although not shown in detail, the clutch cover 52 covering the clutch mechanism 29 covers most of the engine case 21 in a side view. Accordingly, the oil pump 45 is disposed on one side in the vehicle width direction of the pump housing 49 in which the oil suction passage 70 and the oil discharge passage 71 are formed, and the cooling water pump 42 is disposed on the other side. Interference with 52 can be avoided.

  Further, since the pump drive shaft 56 of the cooling water pump 42 is arranged coaxially with the pump driving shaft 53 and integrally with the rotation, the cooling water pump 42 can be driven with a simple structure.

  Further, by providing the oil relief valve 76 in the middle of the oil discharge passage 71 of the pump housing 49, the oil relief valve 76 can be assembled to the lower engine case 21b in a state of being assembled to the pump housing 49 in advance. Will improve. In addition, the return oil from the oil relief valve 76 can be guided directly into the oil pan 22 and the generation of bubbles at that time can be suppressed.

1 is a left side view of a motorcycle showing an embodiment of an oil pump structure according to the present invention. The left view of an engine unit. The right view of an engine unit. Sectional drawing which follows the IV-IV line of FIG. The bottom view of a lower engine case. FIG. Sectional drawing which follows the VII-VII line of FIG. Sectional drawing which follows the VIII-VIII line of FIG. Sectional drawing which follows the IX-IX line | wire of FIG. The top view of a pump housing. The right view of a pump housing. The bottom view of a pump housing. Sectional drawing which follows the XIII-XIII line | wire of FIG. Sectional drawing which follows the XIV-XIV line | wire of FIG. Sectional drawing which follows the XV-XV line | wire of FIG.

Explanation of symbols

17 Engine unit 21 Engine case 21a Upper engine case 21b Lower engine case 22 Oil pan 22a Lower extension 42 Cooling water pump 44 Engine lubrication device 45 Oil pump 49 Pump housing 53 Pump drive shaft 56 Pump drive shaft 65 Oil inflow passage 67 Main Gallery 69 Pump chamber 70 Oil suction passage 71 Oil discharge passage 72 Oil inlet 73 Oil strainer 75 Oil outlet 76 Oil relief valve

Claims (4)

An oil pump, a pump housing in which the oil pump is accommodated, and a pump drive shaft that drives the oil pump are formed, and an oil suction passage and an oil discharge passage are integrally formed in the pump housing in parallel with the pump drive shaft. An oil pump structure characterized in that an oil inflow passage is integrally formed in the engine case, the pump housing is attached to the engine case, and the oil inflow passage and the oil discharge passage are connected. The oil suction passage, the oil discharge passage, and the pump chamber formed inside the pump housing form a substantially U-shaped communication structure, and the oil on the opposite side of the pump housing from the oil pump. The oil pump structure according to claim 1, wherein an oil inlet of the suction passage and an oil outlet of the oil discharge passage are provided. An oil pan is attached to the lower portion of the engine case, and the left and right sides of the oil pan in the vehicle width direction are extended downward to form a downward extension portion. The oil suction passage is disposed above the downward extension portion. While the oil inlet and the oil outlet of the oil discharge passage are arranged, the oil pump is provided on one side in the vehicle width direction of the pump housing in which the oil suction passage and the oil discharge passage are formed, and the cooling water pump is provided on the other side. The oil pump structure according to claim 2, wherein the pump drive shaft of the cooling water pump is arranged coaxially with the pump drive shaft and integrally with the pump. The oil pump structure according to claim 2 or 3, wherein an oil relief valve is provided in the middle of the oil discharge passage of the pump housing.

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