GB637291A - Improvements in shock absorbers - Google Patents

Improvements in shock absorbers

Info

Publication number
GB637291A
GB637291A GB12563/45A GB1256345A GB637291A GB 637291 A GB637291 A GB 637291A GB 12563/45 A GB12563/45 A GB 12563/45A GB 1256345 A GB1256345 A GB 1256345A GB 637291 A GB637291 A GB 637291A
Authority
GB
United Kingdom
Prior art keywords
cylinder
partition
space
valve
ram
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB12563/45A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB12563/45A priority Critical patent/GB637291A/en
Publication of GB637291A publication Critical patent/GB637291A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B64AIRCRAFT; AVIATION; COSMONAUTICS
    • B64CAEROPLANES; HELICOPTERS
    • B64C25/00Alighting gear
    • B64C25/32Alighting gear characterised by elements which contact the ground or similar surface 
    • B64C25/58Arrangements or adaptations of shock-absorbers or springs
    • B64C25/60Oleo legs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60GVEHICLE SUSPENSION ARRANGEMENTS
    • B60G15/00Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
    • B60G15/08Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having fluid spring
    • B60G15/12Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having fluid spring and fluid damper
    • B60G15/14Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having fluid spring and fluid damper the damper being connected to the stub axle and the spring being arranged around the damper

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

637,291. Hydro-pneumatic shock-absorbers. GRUSS, L. R. May 18, 1945, No. 12563. [A Specification was laid open to inspection under Sect. 91 of the Acts, May 23, 1946.] [Class 108 (iii)] In a shock-absorber comprising two telescopically movable members housing a floating ram, one end of which operates against gas under pressure in a cylinder within one of the members while the other end operates against liquid in a cylinder in the other member, which latter cylinder carries a device to restrict the flow of liquid therefrom, the device has an opening through which the ram reciprocates. In the construction shown, the shock-absorber comprises telescopic cylinders 10, 11 secured to two relatively-movable members such as a wing and a landing-wheel of an aircraft, and housing a ram 13 having at its upper end a piston 12 slidable in an auxiliary cylinder 8, secured to the cylinder 10, thus forming a combined air and liquid cushioning device, the lower end of the ram being slidable with clearance in a further liquid-containing cylinder 9 within the cylinder 11. Flow of liquid from and into the cylinder 9 on entry and withdrawal of the ram 13 is controlled by a valve 27 formed underneath with clearance ribs 29 and freely movable vertically in a recess 26 in a partition 25 fixed in the cylinder 11. Liquid flows out of the cylinder 9 through restricted clearance spaces between the ram and the valve 27 and a nut 28 closing the recess, and into the cylinder through the clearance space between the ram and nut, around the valve and through the valve ribs 29. The auxiliary cylinder 8 is secured to the head 16 of cylinder 10 by a shank 61 and has a partition 66 containing a passage 67 controlled by a downwardly-seating check valve 68 and a much smaller permanentlyopen passage 69. A quantity of liquid A is introduced through a nipple 70 into the cylinder 8 above the piston 12 and, when the ram is in the lowermost position, liquid is introduced into the cylinder 9 and above the partition 25 by means of a pipe 80, until it overflows through transverse passages with an axial space 74 in the piston and its extension 14, and thence past a spring-pressed valve 78 through transverse passages 76 with the space inside the cylinders 10, 11 above a partition 40 fixed in the cylinder 11. An outwardly-seating check valve 36 on the cylinder 10 controls flow of atmospheric air through a passage 35 into the annular space formed by co-operating shoulders on the cylinders 10, 11. These shoulders limit the extended position of the shock-absorber and separate on compression of the device. The annular space also communicates through a passage 38 with a closed air cell 37, the arrangement preventing the formation of a vacuum in the annular space. Packing in the form of rubber or like rings 20, 21, 45, 63, 64 of circular cross-section is used where shown, the grooves in which the rings are seated being large enough to allow some movement of the rings. Above the groove for the ring 21 are provided a further groove 23 and an oil recess 22 for lubricating both the ring 21 and the ring 20. Operation.-When there is no load on the shock-absorber, the parts assume the position shown, with compressed air and a layer of oil in the cylinder 8 above the piston 12, with the space in the cylinder 10 above the partition 40 and outside the cylinder 8 filled with compressed air through a valve 50, with the ram cylinder 9 filled with oil to the level B above the partition 25 and with the space between the oil-level B and partition 40 filled with compressed air. On compression, as the cylinder 11 is forced into the cylinder 10, oil in the cylinder 9 is forced through the restricted space within the valve 27 into the space above the partition 25, compressing the air therein and simultaneously the ram 13 moves upwardly so that the piston 12 further compresses the air in the cylinder 8. The upper end of the cylinder 11 rising into the annular space surrounding the cylinder 8 and the upward movement of the partition 40, increases the air pressure in the space above the partition, and high pressure air passes through the passages 76, 74 into the space beneath the piston 12, and past the valve 73 into the space above the liquid A, if the pressure therein is lower. When compression of the shock-absorber ceases, the compressed air in the space above the partition 66 passes back through the restricted passage 69 while the oil above the partition 25 gradually returns to the cylinder 9, thus slowly restoring the parts to their normal positions. The air pressure in the cylinder 8 is built up by reciprocating the cylinders 10, 11 quickly relatively to each other so that air passes rapidly through the passages 76, 74 past the valve 73 into the space above the oil in the cylinder 8. The cylinder 8 and associated parts form the subject-matter of Specification 637,356. The arrangement of the air cell 37 and valve 36 for the prevention of formation of vacuum in the annular space between the cylinders 10, 11 forms the subjectmatter of Specification 637,360.
GB12563/45A 1945-05-18 1945-05-18 Improvements in shock absorbers Expired GB637291A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB12563/45A GB637291A (en) 1945-05-18 1945-05-18 Improvements in shock absorbers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB12563/45A GB637291A (en) 1945-05-18 1945-05-18 Improvements in shock absorbers

Publications (1)

Publication Number Publication Date
GB637291A true GB637291A (en) 1950-05-17

Family

ID=10006963

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12563/45A Expired GB637291A (en) 1945-05-18 1945-05-18 Improvements in shock absorbers

Country Status (1)

Country Link
GB (1) GB637291A (en)

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