Wheel brake transmitter with output pressure control function

Abstract

This invention relates to the field of helicopter wheel brake technology, and particularly to a wheel brake transmitter with output pressure control function. It includes a valve rod, a sleeve, a housing, a piston, an end cap, a push rod, and a valve seat. The valve rod is threadedly connected to the sleeve. The piston is slidably mounted within the housing. The valve seat is also slidably mounted within the housing. The valve rod extends through the valve seat into the piston and is connected to the piston by a pin. The end cap is mounted on the housing. The push rod is threadedly connected to the sleeve. It has the function of converting the force applied by the pilot to the brake pedal into hydraulic pressure output and a maximum output pressure control function to prevent excessive pressure from damaging the brake distribution valve, thus avoiding malfunctions and ensuring normal helicopter flight. An observation window is provided to monitor the internal oil level of the wheel brake transmitter, facilitating maintenance and improving safety. It is highly practical and has significant practical value.

Description

Technical Field

[0001] This invention relates to the field of helicopter wheel brake technology, and in particular to a wheel brake transmitter with output pressure control function. Background Technology

[0002] The wheel brake transmitter is used in the helicopter wheel brake system to convert the force applied by the pilot to the brake pedal into hydraulic pressure output. The output pressure is transmitted to the brake distribution valve through the system pipeline, which controls the brake distribution valve to output different braking pressures, so as to realize the helicopter's ground taxiing, turning and stopping. A general aviation helicopter is equipped with one brake distribution valve, four wheel brake transmitters, and four brake pedals (one for the driver and one for the co-pilot's left and right feet). The brake distribution valve has four control pressure input ports, which are connected to the output ports of the four wheel brake transmitters via pipelines. The hydraulic fluid output from the wheel brake transmitters enters the four brake control chambers of the brake distribution valve. The brake distribution valve has one system pressure input port and two brake pressure output ports. The two brake pressure output ports of the brake distribution valve are connected to the left and right wheel brake devices, respectively. When the helicopter needs to taxi and turn on the ground, the driver or co-pilot applies different pressures to the left and right brake pedals, resulting in different pressures from the left and right wheel brake transmitters. The two brake pressure output ports of the brake distribution valve then output different brake pressures, causing the left and right wheels to rotate at different speeds, thus achieving the turn. When braking is required, the driver or co-pilot depresses both brake pedals to the bottom, and the two brake pressure output ports of the brake distribution valve output the same maximum brake pressure, bringing the helicopter to a stop.

[0003] Existing wheel brake transmitters do not control their maximum output pressure. The output pressure is determined by the force applied to the brake pedal by the pilot and co-pilot, increasing with the force applied to the pedal. The brake control chamber of the brake distribution valve is generally designed to withstand 2.5 times the maximum output pressure of the wheel brake transmitter. If the wheel brake transmitter does not implement output pressure control measures, excessively high output pressure will damage the brake distribution valve, causing malfunctions and affecting the normal flight of the helicopter. Therefore, controlling the maximum output pressure of the wheel brake transmitter is a technical problem that needs to be solved. Summary of the Invention

[0004] To address the problems mentioned in the background section, the present invention provides a wheel brake transmitter with output pressure control function.

[0005] This invention discloses the following technical solution: a wheel brake transmitter with output pressure control function, comprising a valve rod, a sleeve, a housing, a piston, an end cap, a push rod, and a valve seat. The valve rod is threadedly connected to the sleeve. The piston is slidably installed in the housing. The valve seat is slidably installed in the housing. The valve rod extends through the valve seat into the piston. The valve rod and the piston are connected by a pin. The end cap is installed on the housing. The push rod is threadedly connected to the sleeve.

[0006] Furthermore, the lower part of the valve stem is provided with an outer conical surface, and the valve stem is provided with a first shaft hole, a second shaft hole and a third shaft hole in the axial direction, and a first radial hole and a second radial hole in the radial direction. The upper end face is provided with four rectangular grooves evenly distributed in the circumferential direction, and the middle part is provided with a first flange and a first external threaded tube.

[0007] Furthermore, the sleeve is provided with a first axial threaded hole, a second axial threaded hole, a sixth shaft hole, a fourth radial hole, a second flange, and a third flange. The first axial threaded hole is threadedly connected to the first external threaded tube of the valve stem and is limited by the first flange.

[0008] Furthermore, the housing is provided with a seventh axial hole, an eighth axial hole, a third axial threaded hole, a fifth radial hole, a sixth radial hole, a seventh radial hole, an eighth radial hole, a first radial threaded hole, and a second radial threaded hole. A spring seat A is also provided at the bottom of the eighth axial hole inside the housing, and a spring A is installed between the spring seat A and the third flange of the sleeve.

[0009] Furthermore, the valve seat is provided with a fifth axial hole. The valve seat is installed in the seventh axial hole of the housing and can slide axially within the housing. The fifth axial hole of the valve seat and the lower outer conical surface of the valve rod form a conical valve. The conical valve is normally open. One end of the valve rod passes through the fifth axial hole of the valve seat and extends to its first radial hole, which is coaxial with the third radial hole of the piston. A cylindrical pin is connected inside the first radial hole and the third radial hole.

[0010] Furthermore, the piston is provided with a fourth shaft hole in the axial direction, through which the valve rod passes. It is also provided with a third radial hole in the radial direction and four through holes designed along the circumferential direction on the end face. The piston is installed in the seventh axial hole of the housing. The piston is provided with an annular groove in the middle section, and a spring C is designed in the annular groove.

[0011] Furthermore, the end cap is provided with a ninth axial hole and a third external threaded tube. The sleeve extends through the ninth axial hole to the outside of the housing. The end cap is connected to the third axial threaded hole of the housing through the third external threaded tube. A sealing ring C is installed between the housing and the end cap, and a sealing ring E is installed between the end cap and the sleeve.

[0012] Furthermore, the sixth shaft hole of the sleeve is provided with a spring seat B, a spring B, and a spring seat C. The spring seat B abuts against the steel ball, the push rod abuts against the spring seat C, the spring B is installed between the spring seat B and the spring seat C, the steel ball is installed in the third shaft hole of the valve rod, and the steel ball and the opening of the second shaft hole of the valve rod form a ball valve. An end cap is installed on the upper end of the housing. The housing, valve seat, valve rod, and steel ball form a high-pressure chamber, and the housing, valve seat, valve rod, steel ball, and end cap form a low-pressure chamber. The ball valve is connected to the high-pressure chamber through the first shaft hole in the valve rod.

[0013] Furthermore, the middle section of the push rod is provided with a second external threaded tube, which is threadedly connected to the second axial threaded hole of the sleeve. The second external threaded tube is also threadedly connected to nut A. The end face of nut A abuts against the sleeve. The push rod is threadedly connected to the rod end joint bearing and is locked with nut B to prevent loosening.

[0014] Furthermore, the seventh radial hole of the housing is equipped with a hole retaining ring, a glass cover, a support plate, an adjusting washer, a sealing ring A, and a gasket to form an observation window. The end face of the support plate is evenly distributed with eight oil passage holes along the circumferential direction. The eighth radial hole of the housing is equipped with a spherical bearing, and the push rod is connected to the brake pedal through the rod end spherical bearing.

[0015] Furthermore, a connector assembly is installed in the first radial threaded hole of the housing. The oil output from the wheel brake transmitter is output through the fifth radial hole and the connector assembly, and then output to the brake distribution valve through the on-machine pipeline. An exhaust port is installed in the second radial threaded hole of the housing. The low-pressure chamber is connected to the outside through the sixth radial hole and the exhaust port. A protective cap is also installed on the exhaust port.

[0016] Furthermore, a sealing ring B is installed between the valve seat and the housing, and a sealing ring D is installed between the push rod and the sleeve.

[0017] Beneficial effects: Compared with the prior art, the wheel brake transmitter of the present invention with output pressure control function has the function of converting the force applied by the pilot to the brake pedal into hydraulic pressure output and the function of maximum output pressure control, avoiding damage to the brake distribution valve caused by excessive output pressure, avoiding malfunctions, and ensuring normal flight of the helicopter; the function of setting up an observation window to observe the oil level inside the wheel brake transmitter facilitates the use and maintenance of the aircraft, improves the safety of use, has good practicality, is easy to promote and apply, and has great practical value. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the gate arm structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the sleeve structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the shell structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the piston structure of the present invention;

[0023] Figure 6 for Figure 5 Schematic diagram of section AA;

[0024] Figure 7 This is a schematic diagram of the valve seat structure of the present invention;

[0025] Figure 8 This is a schematic diagram of the push rod structure of the present invention;

[0026] Figure 9 This is a schematic diagram of the end cap structure of the present invention;

[0027] In the diagram: 1-Rod end spherical bearing, 2-Nut B, 3-Push rod, 4-Nut A, 5-Sleeve, 6-Sealing ring E, 7-Protective cap, 8-Exhaust nozzle, 9-Hole retaining ring, 10-Glass cover, 11-Support plate, 12-Adjusting washer, 13-Sealing ring A, 14-Washer, 15-Sealing ring B, 16-Connecting nozzle assembly, 17-Spherical bearing, 18-Housing, 19-Piston, 20-Spring C, 21-Pin, 22-Valve seat, 23-Spring seat A, 24-Spring A, 25-Valve rod, 26-Steel ball, 27-Spring seat B, 28-Spring B, 29-Spring seat C, 30-End cap, 31-Sealing ring C, 32-Sealing ring D;

[0028] 251 - External conical surface, 252 - First shaft hole, 253 - Second shaft hole, 254 - Third shaft hole, 255 - First radial hole, 256 - Second radial hole, 257 - Rectangular groove, 258 - First flange, 259 - First external threaded tube, 501 - First axial threaded hole, 502 - Second axial threaded hole, 503 - Sixth shaft hole, 504 - Fourth radial hole, 505 - Second flange, 506 - Third flange, 181 - Seventh axial hole, 18 2-Eighth axial hole, 183-Third axial threaded hole, 184-Fifth radial hole, 185-Sixth radial hole, 186-Seventh radial hole, 187-Eighth radial hole, 188-First radial threaded hole, 189-Second radial threaded hole, 191-Fourth axial hole, 192-Third radial hole, 193-Through hole, 194-Annular groove, 221-Fifth axial hole, 301-Second external threaded tube, 3001-Ninth axial hole, 3002-Third external threaded tube. Detailed Implementation

[0029] like Figures 1 to 9 As shown, a wheel brake transmitter with output pressure control function includes a valve rod 25, a sleeve 5, a housing 18, a piston 19, an end cap 30, a push rod 3, and a valve seat 22. The valve rod 25 is threadedly connected to the sleeve 5. The piston 19 is slidably installed in the housing 18. The valve seat 22 is slidably installed in the housing 18. The valve rod 25 extends through the valve seat 22 into the piston 19. The valve rod 25 and the piston 19 are connected by a pin 21. The end cap 30 is installed on the housing 18. The push rod 3 is threadedly connected to the sleeve 5.

[0030] The lower part of the valve rod 25 is provided with an outer conical surface 251. The valve rod 25 is provided with a first shaft hole 252, a second shaft hole 253 and a third shaft hole 254 on the axial direction, and a first radial hole 255 and a second radial hole 256 on the radial direction. Four rectangular grooves 257 are evenly distributed in the circumferential direction on the upper end face. The middle part has a first flange 258 and a first external threaded tube 259.

[0031] The sleeve 5 is provided with a first axial threaded hole 501, a second axial threaded hole 502, a sixth shaft hole 503, a fourth radial hole 504, a second flange 505 and a third flange 506. The first axial threaded hole 501 is threadedly connected to the first external threaded tube 259 of the valve stem 25 and is limited by the first flange 258.

[0032] The housing 18 is provided with a seventh axial hole 181, an eighth axial hole 182, a third axial threaded hole 183, a fifth radial hole 184, a sixth radial hole 185, a seventh radial hole 186, an eighth radial hole 187, a first radial threaded hole 188, and a second radial threaded hole 189. A spring seat A23 is also provided at the bottom of the eighth axial hole 182 inside the housing 18. A spring A24 is installed between the spring seat A23 and the third flange 506 of the sleeve 5.

[0033] The valve seat 22 is provided with a fifth axial hole 221. The valve seat 22 is installed in the seventh axial hole 181 of the housing 18 and can slide axially within the housing 18. The fifth axial hole 221 of the valve seat 22 and the lower outer conical surface 251 of the valve rod 25 form a conical valve. The conical valve is normally open. One end of the valve rod 25 passes through the fifth axial hole 221 of the valve seat 22 and extends to its first radial hole 255, which is coaxial with the third radial hole 192 of the piston 19. A cylindrical pin 21 is connected in the first radial hole 255 and the third radial hole 192.

[0034] The piston 19 is provided with a fourth shaft hole 191 in the axial direction. The valve rod 25 passes through the fourth shaft hole 191 of the piston 19. A third radial hole 192 is provided in the radial direction. Four through holes 193 are designed along the circumferential direction on the end face. The piston 19 is installed in the seventh axial hole 181 of the housing 18. The piston 19 can slide axially in the housing 18. An annular groove 194 is designed in the middle section of the piston 19. A spring C20 is designed in the annular groove 194 to prevent the cylindrical pin 21 from moving in the third radial hole 192 of the piston 19 and causing jamming.

[0035] The end cap 30 is provided with a ninth axial hole 3001 and a third external threaded tube 3002. The sleeve 5 extends through the ninth axial hole 3001 to the outside of the housing 18. The end cap 30 is connected to the third axial threaded hole 183 of the housing 18 through the third external threaded tube 3002, which limits the second flange 505 of the sleeve 5 to prevent the sleeve 5 from coming out. A sealing ring C31 is installed between the housing 18 and the end cap 30, and a sealing ring E6 is installed between the end cap 30 and the sleeve 5 to ensure the sealing of the transmitter.

[0036] The sleeve 5 has a sixth shaft hole 503 containing a spring seat B27, a spring B28, and a spring seat C29. The spring seat B27 abuts against the steel ball 26, and the push rod 3 abuts against the spring seat C29. The spring B28 is installed between the spring seat B27 and the spring seat C29. The steel ball 26 is installed in the third shaft hole 254 of the valve rod 25. The steel ball 26 and the opening of the second shaft hole 253 of the valve rod 25 form a ball valve, which is normally closed. An end cap 30 is installed on the upper end of the housing 18. 8. The high-pressure chamber is formed by the valve seat 22, valve rod 25, and steel ball 26. The low-pressure chamber is formed by the housing 18, valve seat 22, valve rod 25, steel ball 26, and end cover 30. The ball valve is connected to the high-pressure chamber through the first shaft hole 252 inside the valve rod 25. When the pressure of the high-pressure chamber exceeds the specified value, the ball valve opens to release part of the pressure. When the pressure of the high-pressure chamber is lower than the specified value, the ball valve closes to maintain the braking pressure. In the non-working state, the high-pressure chamber and the low-pressure chamber are connected through the cone valve. In the working state, the cone valve closes to isolate the high-pressure chamber and the low-pressure chamber.

[0037] The push rod 3 is provided with a second external threaded tube 301 in the middle section. The second external threaded tube 301 is threadedly connected to the second axial threaded hole 502 of the sleeve 5. The second external threaded tube 301 is also threadedly connected to the nut A4. The end face of the nut A4 abuts against the sleeve 5. The nut A4 is used for limiting. By adjusting the thread engagement between the push rod 3 and the sleeve 5, the elastic force of the spring B28 is adjusted, the opening pressure of the ball valve is adjusted, and thus the maximum output pressure of the wheel brake transmitter is controlled. The push rod 3 is threadedly connected to the rod end joint bearing 1 and locked with the nut B2 to prevent loosening. Adjusting the thread engagement length can adjust the distance between the rod end joint bearing 1 and the joint bearing 17 of the wheel brake transmitter to meet the installation space requirements on the machine.

[0038] The seventh radial hole 186 of the housing 18 is equipped with a retaining ring 9, a glass cover 10, a support plate 11, an adjusting washer 12, a sealing ring A13, and a washer 14 to form an observation window. The end face of the support plate 11 is evenly distributed with eight oil passage holes along the circumferential direction. The oil in the low-pressure chamber flows through the oil passage holes to the space between the glass cover 10 and the support plate 11, which allows for observation of the oil level inside the wheel brake transmitter during use and timely replenishment of oil. The eighth radial hole 187 of the housing 18 is equipped with a spherical bearing 17. The push rod 3 is connected to the brake pedal through the rod end spherical bearing 1, which facilitates the installation of the wheel brake transmitter when the connecting shaft of the rod end spherical bearing 1 and the connecting shaft of the spherical bearing 17 are not parallel. During operation, the wheel brake transmitter swings around the axis of the eighth radial hole 187 with the movement of the brake pedal. The rod end spherical bearing 1 and the spherical bearing 17 can reduce friction and avoid jamming.

[0039] The housing 18 has a connecting nozzle assembly 16 installed in the first radial threaded hole 188. The oil output from the wheel brake transmitter is output through the fifth radial hole 184 and the connecting nozzle assembly 16, and then output to the brake distribution valve through the machine pipeline. The housing 18 has an exhaust nozzle 8 installed in the second radial threaded hole 189. The low-pressure chamber is connected to the outside through the seventh radial hole 186 and the exhaust nozzle 8. When the wheel brake transmitter outputs oil, it draws air through the exhaust nozzle 8 to fill the chamber, preventing the low-pressure chamber from forming a vacuum and increasing the operating force. When the brake is released, it exhales through the exhaust nozzle 8 to prevent the low-pressure chamber pressure from rising and causing the cone valve to not open, thus preventing the brake pressure from being released. A protective cap 7 is also installed on the exhaust nozzle 8 to prevent internal oil from spraying out in the acceleration environment and to prevent foreign matter from entering the product.

[0040] A sealing ring B15 is installed between the valve seat 22 and the housing 18, and a sealing ring D32 is installed between the push rod 3 and the sleeve 5 to ensure the airtightness of the transmitter.

[0041] When braking is required, the pilot depresses the pedal. The stick end bearing 1, push rod 3, sleeve 5, valve rod 25, and piston 19 move downwards a certain distance, closing the cone valve and isolating the high-pressure and low-pressure chambers of the wheel brake transmitter. Pressure is then built up in the high-pressure chamber of the wheel brake transmitter. Oil from the high-pressure chamber is supplied to the brake distribution valve through the fifth radial hole 184 of the housing 18, the nozzle assembly 16, and the system piping. As the pilot depresses the pedal with increasing force, the output pressure increases, achieving braking. When the output pressure is too high... The oil in the high-pressure chamber acts on the steel ball 26 through four through holes 193 designed along the circumferential direction on the end face of the piston 19, the second radial hole 256 of the valve rod 25, the first shaft hole 252 and the second shaft hole 253 of the valve rod 25, pushing open the ball valve, discharging part of the oil, and reducing the output pressure; when the output pressure drops to the set pressure, the ball valve closes, the output pressure rises, and the oil discharged by the ball valve flows back to the low-pressure chamber through the four rectangular grooves 257 on the upper end face of the valve rod 25 and the fourth radial hole 504 of the sleeve 5.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A wheel brake transmitter with output pressure control function, comprising a valve rod (25), a sleeve (5), a housing (18), a piston (19), an end cap (30), a push rod (3), and a valve seat (22), characterized in that: The valve rod (25) is threadedly connected to the sleeve (5), the piston (19) is slidably installed in the housing (18), the valve seat (22) is slidably installed in the housing (18), the valve rod (25) extends through the valve seat (22) into the piston (19), the valve rod (25) and the piston (19) are connected by a pin (21), the end cap (30) is installed on the housing (18), and the push rod (3) is threadedly connected to the sleeve (5); The lower part of the valve rod (25) is provided with an outer conical surface (251). The valve rod (25) is provided with a first shaft hole (252), a second shaft hole (253) and a third shaft hole (254) on the axial direction. It has a first radial hole (255) and a second radial hole (256) on the radial direction. Four rectangular grooves (257) are evenly distributed in the circumferential direction on the upper end face. The middle part has a first flange (258) and a first external threaded tube (259). The valve seat (22) is provided with a fifth shaft hole (221). The valve seat (22) is installed in the seventh axial hole (181) of the housing (18) and can slide axially in the housing (18). The fifth shaft hole (221) of the valve seat (22) and the lower outer conical surface (251) of the valve rod (25) form a conical valve. The conical valve is normally open. One end of the valve rod (25) passes through the fifth shaft hole (221) of the valve seat (22) and extends to its first radial hole (255) and is coaxial with the third radial hole (192) of the piston (19). A cylindrical pin (21) is connected in the first radial hole (255) and the third radial hole (192). The sleeve (5) has a spring seat B (27), a spring B (28), and a spring seat C (29) in its sixth shaft hole (503). The spring seat B (27) abuts against the steel ball (26), and the push rod (3) abuts against the spring seat C (29). The spring B (28) is installed between the spring seat B (27) and the spring seat C (29). The steel ball (26) is installed in the third shaft hole (254) of the valve rod (25). The second shaft hole (253) of the valve rod (25) forms a ball valve. An end cap (30) is installed on the upper end of the housing (18). The housing (18), valve seat (22), valve rod (25), and steel ball (26) form a high-pressure chamber. The housing (18), valve seat (22), valve rod (25), steel ball (26), and end cap (30) form a low-pressure chamber. The ball valve is connected to the high-pressure chamber through the first shaft hole (252) inside the valve rod (25).

2. The wheel brake transmitter with output pressure control function according to claim 1, characterized in that: The sleeve (5) is provided with a first axial threaded hole (501), a second axial threaded hole (502), a sixth shaft hole (503), a fourth radial hole (504), a second flange (505) and a third flange (506). The first axial threaded hole (501) is connected to the first external threaded tube (259) of the valve stem (25) by thread, and is limited by the first flange (258).

3. The wheel brake transmitter with output pressure control function according to claim 1, characterized in that: The housing (18) is provided with a seventh axial hole (181), an eighth axial hole (182), a third axial threaded hole (183), a fifth radial hole (184), a sixth radial hole (185), a seventh radial hole (186), an eighth radial hole (187), a first radial threaded hole (188), and a second radial threaded hole (189). The bottom of the eighth axial hole (182) in the housing (18) is also provided with a spring seat A (23), and a spring A (24) is installed between the spring seat A (23) and the third flange (506) of the sleeve (5).

4. The wheel brake transmitter with output pressure control function according to claim 1, characterized in that: The piston (19) is provided with a fourth shaft hole (191) in the axial direction. The valve rod (25) passes through the fourth shaft hole (191) of the piston (19). A third radial hole (192) is provided in the radial direction. Four through holes (193) are designed on the end face along the circumferential direction. The piston (19) is installed in the seventh axial hole (181) of the housing (18). An annular groove (194) is designed in the middle section of the piston (19). A spring C (20) is provided in the annular groove (194).

5. The wheel brake transmitter with output pressure control function according to claim 1, characterized in that: The end cap (30) is provided with a ninth axial hole (3001) and a third external threaded tube (3002). The sleeve (5) extends through the ninth axial hole (3001) to the outside of the housing (18). The end cap (30) is connected to the third axial threaded hole (183) of the housing (18) through the third external threaded tube (3002). A sealing ring C (31) is installed between the housing (18) and the end cap (30). A sealing ring E (6) is installed between the end cap (30) and the sleeve (5).

6. The wheel brake transmitter with output pressure control function according to claim 1, characterized in that: The push rod (3) is provided with a second external threaded tube (301) in the middle section. The second external threaded tube (301) is connected to the second axial threaded hole (502) of the sleeve (5) by thread. The second external threaded tube (301) is also connected to the nut A (4) by thread. The end face of the nut A (4) abuts against the sleeve (5). The push rod (3) is connected to the rod end joint bearing (1) by thread. The nut B (2) is used to lock and prevent loosening.

7. The wheel brake transmitter with output pressure control function according to claim 1, characterized in that: The seventh radial hole (186) of the housing (18) is equipped with a hole retaining ring (9), a glass cover (10), a support plate (11), an adjusting washer (12), a sealing ring A (13), and a washer (14) to form an observation window. The end face of the support plate (11) is provided with eight oil passage holes evenly distributed along the circumferential direction. The eighth radial hole (187) of the housing (18) is equipped with a spherical bearing (17).

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