An energy storage buffer

Abstract

An energy storage type buffer, comprising a buffer outer cylinder (1), a push rod (2), a positioning sleeve (3), a support column (4), a first end cover (5), a second end cover (7), a control rod (9), and a connecting rod (10). A buffer structure is formed through the structural design of a part of the inner cavity of the outer cylinder. The energy during the aircraft landing process is absorbed by the buffer structure, and the rapidly compressed energy is stored in a compression spring through a locking mechanism, improving the smoothness of the aircraft during the landing process, meeting the buffer requirements of small aircraft for landing gears, and at the same time enhancing the safety of the landing gear mechanism.

Description

Technical Field

[0001] The present invention relates to an energy storage type buffer, belonging to the field of aircraft landing gears. Background Art

[0002] The existing aircraft landing gear buffers are generally oil-gas mixed buffers, which are suitable for large aircraft. If used on small aircraft, there are the following defects: small aircraft require the landing gear part to be light in weight and the landing gear compartment to be compact in space, while the oil-gas mixed buffer is large in mass and volume and cannot well meet the requirements of small aircraft for the landing gear part; the oil-gas mixed buffer is filled with hydraulic oil and nitrogen, and the internal pressure is relatively high. Once leaked, it will cause pollution to the environment and the fuselage. Summary of the Invention

[0003] The technical problem solved by the present invention is: aiming at the problems in the current prior art that the oil-gas mixed buffer adopted by the traditional landing gear is large in mass and volume and has a relatively high internal pressure, resulting in potential safety hazards, an energy storage type buffer is proposed.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] An energy storage type buffer includes a buffer outer cylinder, a push rod, a positioning sleeve, a support column, a first end cover, a second end cover, a control rod, and a connecting rod. The second end cover and the first end cover are respectively arranged at the two ends A end face and B end face of the buffer outer cylinder. The control rod is hinged to the buffer outer cylinder through the second end cover, and the buffer outer cylinder is hinged to an external mechanism through the first end cover. The buffer outer cylinder is provided with a hollow cavity. The positioning sleeve is arranged in the hollow cavity and extends out from the A end face of the buffer outer cylinder hinged to the control rod. The positioning sleeve is respectively provided with joints hinged to the connecting rod and the external mechanism. The support column is arranged in the hollow cavity of the buffer outer cylinder and is inserted into the side wall of the B end face of the buffer outer cylinder provided with the first end cover. One end of the push rod is arranged in the hollow cavity of the positioning sleeve, and the other end passes through the hollow cavity of the buffer outer cylinder and is connected to the support column arranged in the hollow part of the buffer outer cylinder. The connecting rod is connected to the control rod through a bolt.

[0006] The second end cover is provided with a circular groove, and a second spring installed around the outer circumferential surface of the positioning sleeve is arranged in the circular groove.

[0007] The top of the push rod near the B end face is provided with a circular groove and a threaded hole. The end of the support column is provided with a thread and is connected to the push rod by screwing into the threaded hole.

[0008] A first spring installed around the outer circumferential surface of the support column is arranged in the circular groove of the push rod.

[0009] Threaded holes are provided on the circumferential surface of the positioning sleeve, and an annular groove is provided on the outer circumferential surface of the ejector rod. The positioning sleeve and the ejector rod are limited in the axial relative displacement amount by fastening screws passing through the annular groove and screwed into the threaded holes.

[0010] The axial height of the annular groove is greater than the diameter of the cylindrical head of the fastening screw.

[0011] The ejector rod can be axially displaced relative to the positioning sleeve by an appropriate amount and can rotate relative to the positioning sleeve about the axis.

[0012] Deep grooves and shallow grooves are alternately provided on the inner circumferential surface of the outer cylinder of the buffer, and are respectively connected in cooperation with the ejector rod and the positioning sleeve.

[0013] Deep groove bosses are provided on the outer circumferential surface of the ejector rod. The deep groove bosses are evenly distributed along the outer circumferential surface of the ejector rod and slide in the deep grooves when the positioning sleeve is compressed. The inclined surfaces of the deep grooves match the inclined surfaces of the deep groove bosses.

[0014] Shallow groove bosses are provided on the outer circumferential surface of the positioning sleeve. The shallow groove bosses are evenly distributed along the outer circumferential surface of the butt end of the positioning sleeve. The bosses are connected in matching with the shallow grooves and slide in the shallow grooves when the positioning sleeve is compressed. The inclined surfaces of the shallow grooves match the inclined surfaces of the shallow groove bosses.

[0015] When the ejector rod and the positioning sleeve move relative to each other, the inclined surfaces on the deep groove bosses on the outer circumferential surface of the ejector rod are in close contact with the inclined surfaces on the shallow groove bosses on the outer circumferential surface of the positioning sleeve.

[0016] The advantages of the present invention compared with the prior art are as follows:

[0017] A energy storage type buffer provided by the present invention has a dual buffering effect under the action of impact load when the aircraft lands. The structure of the inner cavity part of the outer cylinder is quickly compressed, and the locking mechanism composed of the ejector rod, the outer cylinder and the positioning sleeve stores the compression energy in the compression spring, and the remaining energy is buffered and absorbed by the ordinary spring outside the positioning sleeve. This buffer can quickly absorb the energy during the aircraft landing process and improve the smoothness of the aircraft during landing. Brief Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the uncompressed position state of the buffer structure provided by the invention;

[0019] Figure 2 It is a schematic diagram of the locking mechanism when the buffer structure provided by the invention is uncompressed;

[0020] Figure 3 It is a schematic structural diagram of the compressed position state of the buffer structure provided by the invention;

[0021] Figure 4Schematic diagram of the locking mechanism after compression of the buffer structure provided for the invention;

[0022] Figure 5 Schematic diagram of the inner circumferential surface structure of the buffer outer cylinder provided for the invention;

[0023] Figure 6 Schematic diagram of the outer circumferential surface structure of the positioning sleeve provided for the invention;

[0024] Figure 7 Schematic diagram of the outer circumferential surface structure of the ejector rod provided for the invention; Detailed implementation mode

[0025] An energy storage buffer for buffering during the landing of an aircraft, comprising a buffer outer cylinder 1, an ejector rod 2, a positioning sleeve 3, a support column 4, a first end cap 5, a first spring 6, a second end cap 7, a second spring 8, a control rod 9, and a connecting rod 10. The two ends of the buffer outer cylinder 1 are respectively an A end face and a B end face. The second end cap 7 and the first end cap 5 are respectively arranged at the A end face and the B end face at the two ends of the buffer outer cylinder 1. The second end cap 7 is used for hinging with the bearing at the middle section of the control rod 9, and the first end cap 5 is used for hinging with an external mechanism. A positioning sleeve 3 is arranged on one side of the second end cap 7. The positioning sleeve 3 is installed in the hollow cavity of the buffer outer cylinder 1 and extends out from the A end face of the buffer outer cylinder 1. The ejector rod 2 is arranged in the hollow cavity of the positioning sleeve 3, passes through the hollow cavities of the positioning sleeve 3 and the buffer outer cylinder 1 respectively, and is connected to the support column 4 arranged in the hollow part of the buffer outer cylinder 1. Among them, the support column 4 is arranged in the hollow cavity of the buffer outer cylinder 1 and is inserted into the side wall of the B end face of the buffer outer cylinder 1 provided with the first end cap 5. The positioning sleeve 3 is respectively provided with joints hinged to the connecting rod 10 and an external mechanism. The connecting rod 10 is connected to the control rod 9 through bolts; among them, it also includes a screw 11, a nut 12, and a fastening screw 13;

[0026] A circular groove is arranged on the second end cap 7, and a second spring 8 installed around the outer circumferential surface of the positioning sleeve 3 is arranged in the circular groove; a circular groove and a threaded hole are arranged at the top of the ejector rod 2 near the B end face, and a first spring 6 installed around the outer circumferential surface of the support column 4 is arranged in the circular groove;

[0027] The end of the support column 4 is provided with a thread and is connected to the ejector rod 2 by screwing into the threaded hole. At the same time, a threaded hole is arranged on the circumferential surface of the positioning sleeve 3, and an annular groove is arranged on the outer circumferential surface of the ejector rod 2. The positioning sleeve 3 and the ejector rod 2 are limited in the axial relative displacement amount by a fastening screw passing through the annular groove and screwing into the threaded hole. The axial height of the annular groove is greater than the diameter of the cylindrical head of the fastening screw. The ejector rod 2 can axially displace moderately relative to the positioning sleeve 3 and can rotate relative to the positioning sleeve 3 around the axis;

[0028] The outer buffer cylinder 1 is provided with deep grooves and shallow grooves alternately along the inner circumferential surface, which are respectively connected with the ejector rod 2 and the positioning sleeve 3 in a mating manner; deep groove bosses are arranged on the outer circumferential surface of the ejector rod 2, and the deep groove bosses are evenly distributed along the outer circumferential surface of the ejector rod 2 and slide in the deep grooves when the positioning sleeve 3 is compressed, and the inclined surface of the deep groove matches the inclined surface of the deep groove boss; shallow groove bosses are arranged on the outer circumferential surface of the positioning sleeve 3, and the shallow groove bosses are evenly distributed along the outer circumferential surface of the butt end of the positioning sleeve 3, and the bosses are connected with the shallow grooves in a matching manner and slide in the shallow grooves when the positioning sleeve 3 is compressed, and the inclined surface of the shallow groove matches the inclined surface of the shallow groove boss, and when the ejector rod 2 and the positioning sleeve 3 move relative to each other, the inclined surfaces on the bosses on the outer circumferential surface of the ejector rod 2 are in close contact with the inclined surfaces on the bosses on the outer circumferential surface of the positioning sleeve 3.

[0029] When the second spring 8 is not compressed or stretched, the ordinary spring is in a free elongation state. When compressed, the ordinary spring is in a compressed state. When subjected to a tensile force, the ordinary spring is in a compressed state; the first spring 6 is always in a compressed state. During the compression process of the compression spring, there is a relative displacement between the support column 4 and the inner cylindrical cavity of the first end cap 5.

[0030] The working principle and process of the present invention will be further described below in conjunction with specific embodiments:

[0031] As Figure 1 shown, the buffer is at the neutral position at this time. The axis of the hinge hole of the first end cap 5 is parallel to the axis of the hinge hole of the positioning sleeve 3, and the angle of the hinge hole axis does not change during the whole movement process, so that the landing gear can be retracted into the landing gear bay in the correct posture. The control lever 9 and the connecting rod 10 are in an extended state.

[0032] As Figure 2 、 Figure 5 、 Figure 6 and Figure 7 shown, when the buffer is not under a compressive load, the boss E on the ejector rod 2 in the buffer is in the deep groove C of the buffer outer cylinder 1, and the boss E cooperates with the inner surface of the deep groove C. The boss F on the positioning sleeve 3 is in the deep groove C and the shallow groove D of the buffer outer cylinder 1, and the boss F has a cooperative effect with the shallow groove C. Under the action of the first spring 6, the inclined surface G on the boss E of the ejector rod 2 is in contact and cooperation with the inclined surface H on the boss F of the positioning sleeve 3. At this time, the buffer is at the neutral position. The second spring 8 is neither under a compressive force nor under a tensile force at this position.

[0033] As Figure 3 shown, after the buffer is subjected to a compressive action, the axes of the hinge holes of the first end cap 5 and the positioning sleeve 3 remain parallel, and the control lever 9 and the connecting rod 10 are in a tightened state. The second spring 8 is in a compressed state, the first spring 6 is subjected to a greater compressive action, and the support column 4 extends into the inner cavity of the first end cap 5.

[0034] As Figure 4 , Figure 5 , Figure 6 and Figure 7 shown, after the buffer is compressed, since the inclined surface G of the boss E on the ejector rod 2 contacts the inclined surface H of the boss F on the positioning sleeve, the positioning sleeve 3 pushes the ejector rod 2 to move along the axis. The boss E on the ejector rod 2 slides in the deep groove C in the buffer outer cylinder 1. When it slides to the limit position, due to the existence of the inclined surface, the inclined surface G on the ejector rod 2 slides on the inclined surface J in the buffer outer cylinder 1. Under the action of the first spring 6, the boss E on the ejector rod 2 falls into the groove L in the buffer outer cylinder 1, and the inclined surface G of the ejector rod 2 contacts the inclined surface K in the buffer outer cylinder 1. Thus, the compressed position of the buffer is locked, and a part of the energy is stored in the first spring 6 to achieve energy absorption. In order to ensure that the boss E on the ejector rod 2 can smoothly slide into the groove L in the buffer outer cylinder 1, there is a certain deviation in the axis between the boss F on the positioning sleeve 3 and the boss E on the ejector rod 2.

[0035] As Figure 4 , Figure 5 , Figure 6 and Figure 7 shown, when the buffer is stable under the external load, a load P is applied to the joystick to move it away from the buffer. Due to the action of the connecting rod 10, the positioning sleeve 3 will move along the axis of the buffer. The boss F on the positioning sleeve 3 that cooperates with the shallow groove in the buffer outer cylinder 1 pushes the positioning rod 2 to move. The boss E on the positioning rod 2 exits the groove F in the buffer outer cylinder 1, and the inclined surface G on the boss E contacts the inclined surface M in the outer cylinder. Under the action of the first spring 6, the inclined surface G on the boss E slides on the inclined surface M and falls into the deep groove C in the outer cylinder. The final position is as Figure 1 and Figure 2 shown. The ejector rod 2 rotates 90 degrees around the axis during one compression and release process.

[0036] During the whole buffering process, the locking stage is suitable for quickly absorbing the landing energy during the landing stage of a light aircraft, and the release stage is suitable for coping with the next flight after the aircraft stops stably. The buffer has a small overall mass, a small volume, no pollutants such as oil, and is convenient for use and maintenance.

[0037] The techniques not disclosed in the present invention are well-known techniques in the art.

Claims

1. An energy storage buffer, characterized in that: It includes a buffer outer cylinder (1), a push rod (2), a positioning sleeve (3), a support column (4), a first end cover (5), a second end cover (7), a control rod (9), and a connecting rod (10). The two ends of the buffer outer cylinder (1) are an A end face and a B end face respectively. The second end cover (7) and the first end cover (5) are respectively arranged at the A end face and the B end face at the two ends of the buffer outer cylinder (1). The second end cover (7) is used for hinged connection with the bearing at the middle section of the control rod (9), and the first end cover (5) is used for hinged connection with an external mechanism. A positioning sleeve (3) is arranged on one side of the second end cover (7). The positioning sleeve (3) is installed in the hollow cavity of the buffer outer cylinder (1) and extends out from the A end face of the buffer outer cylinder (1). The push rod (2) is arranged in the hollow cavity of the positioning sleeve (3), passes through the hollow cavities of the positioning sleeve (3) and the buffer outer cylinder (1) respectively, and is connected to the support column (4) arranged in the hollow part of the buffer outer cylinder (1). Among them, the support column (4) is arranged in the hollow cavity of the buffer outer cylinder (1) and is inserted into the side wall of the B end face of the buffer outer cylinder (1) where the first end cover (5) is arranged. Joints for hinged connection with the connecting rod (10) and the external mechanism are respectively arranged on the positioning sleeve (3). The connecting rod (10) is connected to the control rod (9) by bolts; A circular groove is arranged on the second end cover (7), and a second spring (8) installed around the outer circumferential surface of the positioning sleeve (3) is arranged in the circular groove; A circular groove and a threaded hole are arranged at the top near the B end face of the push rod (2). The end of the support column (4) is provided with a thread and is connected to the push rod (2) by screwing into the threaded hole; A first spring (6) installed around the outer circumferential surface of the support column (4) is arranged in the circular groove of the push rod (2); Threaded holes are arranged on the circumferential surface of the positioning sleeve (3), and an annular groove is arranged on the outer circumferential surface of the push rod (2). The relative axial displacement amount between the positioning sleeve (3) and the push rod (2) is limited by fastening screws passing through the annular groove and screwing into the threaded holes; The axial height of the annular groove is greater than the diameter of the cylindrical head of the fastening screw; The push rod (2) can axially displace moderately relative to the positioning sleeve (3) and can rotate around the axis relative to the positioning sleeve (3); Deep grooves and shallow grooves are alternately arranged along the inner circumferential surface of the buffer outer cylinder (1) and are respectively in fit connection with the push rod (2) and the positioning sleeve (3); Deep groove bosses are arranged on the outer circumferential surface of the push rod (2). The deep groove bosses are evenly distributed along the outer circumferential surface of the push rod (2) and slide in the deep grooves when the positioning sleeve (3) is compressed. The deep groove inclined surface matches the inclined surface of the deep groove boss; Shallow groove bosses are arranged on the outer circumferential surface of the positioning sleeve (3). The shallow groove bosses are evenly distributed along the outer circumferential surface of the butt end of the positioning sleeve (3). The bosses are in fit connection with the shallow grooves and slide in the shallow grooves when the positioning sleeve (3) is compressed. The shallow groove inclined surface matches the inclined surface of the shallow groove boss; When the push rod (2) and the positioning sleeve (3) move relative to each other, the inclined surfaces on the deep groove bosses on the outer circumferential surface of the push rod (2) are in close contact with the inclined surfaces on the shallow groove bosses on the outer circumferential surface of the positioning sleeve (3).

Images