CN115978125A - Multi freedom buffer length locking device - Google Patents

Abstract

The application provides a multi freedom buffer length locking device, locking device includes: a cylinder; the upper rod body is connected with one end of the column body; the lower rod body is connected with the other end of the column body; the upper rod body and/or the lower rod body are/is connected with the mounting point of the buffer strut through the first joint; the application provides an adjustable length, buffer length locking device who has multi freedom installation angle satisfies the length locking demand of buffer under the different compression displacement, can install fast and be convenient for maintain simultaneously.

Description

Multi freedom buffer length locking device

Technical Field

The application belongs to the technical field of helicopter guarantee equipment, and particularly relates to a multi-freedom-degree buffer length locking device.

Background

When a ship sails on the sea or stays still, a helicopter parked on the ship can be in a shaking state under the action of sea waves and sea wind, a buffer of the helicopter wheel type undercarriage has the functions of absorbing landing energy and reducing impact load, and the buffer can perform telescopic motion according to functional design, namely the outer cylinder of the buffer and the piston rod can perform relative motion along the axis (as shown in figure 3).

In order to keep the helicopter in a stable static state when the helicopter is moored and fixed on the ship surface, the length of a buffer of a landing gear of the helicopter needs to be limited to be kept unchanged. Therefore, a corresponding bumper extension limiter, i.e., a bumper length locking device, is designed.

At present, for the extension limiting method of the undercarriage buffer of the ship-based helicopter, a rod-shaped structure is mainly used for longitudinally connecting an upper mounting point and a lower mounting point of the undercarriage, so that the fixed extension limiting effect is achieved. However, when the landing gear bumper is installed, the outer cylinder and the piston rod of the landing gear bumper are easy to rotate relative to each other around the axis, so that the originally designed installation position point may generate circumferential dislocation along the axis (as shown in fig. 5), and the limiter cannot be installed, or the defects of inconvenience in installation, complex operation, time consumption in installation and the like exist.

Disclosure of Invention

In view of the above technical problem, the present application provides a multiple degree of freedom buffer length locking device, including:

a cylinder;

the upper rod body is connected with one end of the column body;

the lower rod body is connected with the other end of the column body;

and the upper rod body and/or the lower rod body are/is connected with the mounting point of the buffer strut through the first joint.

Preferably, the first joint comprises:

and the upper rod body and the lower rod body are connected with a mounting point on the buffer strut through the mounting joint.

Preferably, the first joint comprises:

and the upper rod body is connected with a mounting point on the buffer strut through the steering joint.

Preferably, the ends of the upper rod body and the lower rod body are provided with lugs, and the lugs comprise lug holes.

Preferably, the locking device further comprises:

the joint bearing outer ring is arranged in the ear holes at the end parts of the upper rod body and the lower rod body;

the joint bearing inner ring is arranged in the joint bearing outer ring;

and the bolt penetrates through the inner ring of the joint bearing to connect the mounting joint with the upper rod body and the lower rod body.

Preferably, the installation joint comprises:

a through hole through which the bolt can pass;

an open slot communicated with the through hole; wherein, the lug of going up body of rod and lower body of rod tip can be placed in the open slot.

Preferably, the installation joint further comprises:

and the mounting piece can be connected with the mounting point on the buffer support.

Preferably, the buffer strut comprises:

the outer cylinder is provided with an upper mounting point;

the piston rod is connected with the outer barrel, and a lower mounting point is arranged on the piston rod; wherein a mounting tab on the mounting joint is connectable with the upper mounting point and the lower mounting point.

The beneficial technical effect of this application:

the application provides an adjustable length, buffer length locking device who has multi freedom installation angle satisfies the length locking demand under the different compression displacements of buffer, can install fast and be convenient for maintain simultaneously.

Drawings

FIG. 1 is a diagram of a length locking device provided by an embodiment of the present application;

FIG. 2 is a schematic diagram of an axial movement of a buffer provided in an embodiment of the present application;

FIG. 3 is a schematic view of the length lock assembly provided by an embodiment of the present application;

FIG. 4 is a schematic view of the length lock assembly installation provided by an embodiment of the present application;

FIG. 5 isbase:Sub>A cross-sectional view A-A provided by an embodiment of the present application;

FIG. 6 is a cross-sectional view of a rod body engagement provided in accordance with an embodiment of the present application;

FIG. 7 is a schematic view of multiple degrees of freedom rotation of a shaft according to an embodiment of the present disclosure;

FIG. 8 is a structural component diagram of another embodiment provided in the embodiments of the present application;

FIG. 9 isbase:Sub>A sectional view ofbase:Sub>A structural component of another embodiment of the present application, as shown in FIG. A-A;

FIG. 10 is a schematic view of another embodiment of the present application;

FIG. 11 is a top view of an alternative embodiment A of the present application;

FIG. 12 is a component diagram of another embodiment of the present application;

wherein, 1-length locking means; 2-mounting the rod body; 3-a column; 4-lower the rod body; 5, installing a joint; 6-bolt; 7-a slot nut; 8-cotter pin; 9-joint bearing inner race; 10-knuckle bearing outer race; 11-a limiting block; 12-an outer barrel; 13-a piston rod; 14-a lock nut; 15-a steering joint; 17-installing a joint; 18-a screw; 19-through hole.

Detailed Description

Referring to fig. 1-12, in the present embodiment, the length locking device 1 is composed of: the upper rod body 2 is of an external thread hollow rod body structure, the column body 3 is of an internal thread columnar hollow structure, and the lower rod body 4 is of an external thread solid rod body structure; the upper rod body 2 is coaxial with the column body 3 and the lower rod body 4; go up the body of rod 2 and pass through the screw thread spiro union with cylinder 3, lower body of rod 4 passes through the screw thread spiro union with cylinder 3 down, and 4 tip of the body of rod have stopper 11 down simultaneously, and stopper 11 diameter is greater than 3 lower part through-hole diameters of cylinder, can prevent down that body of rod 4 from unscrewing cylinder 3 completely. The upper rod body 2 and the lower rod body 4 are screwed into the inner cavity of the column body 3 through threads, so that the device can be extended and shortened. Particularly, when the upper rod body 2 and the lower rod body 4 rotate to approach to each other, the lower rod body 4 can enter the rod body hole cavity of the upper rod body 2, and the height of the cavity in the rod body 3 can be shortened, so that the structure is more compact (as shown in fig. 7).

The lug at the upper part of the upper rod body 2 is connected with the mounting joint 5 through a bolt 6, the end part of the bolt 6 is mounted by using a groove-shaped nut 7, and a cotter 8 is arranged for preventing looseness; the lug at the lower part of the lower rod body 4 is connected with the mounting joint 5 through a bolt 6, the end part of the bolt 6 is mounted by using a groove-shaped nut 7, and a cotter pin 8 is arranged for preventing looseness; the mounting adapter 5 is mounted to the landing gear outer barrel 12 and piston rod 13 mounting interface whereby the length locking device 1 is mounted to the bumper in the manner shown in figure 4.

As shown in fig. 6, the upper rod body 2/the lower rod body 4 lug is in interference fit with the knuckle bearing outer ring 10 to keep synchronous movement; the inner ring 9 of the joint bearing is in interference fit with the bolt 6, and after the inner ring 9 of the joint bearing is installed through the bolt 6, the inner ring and the outer barrel/piston rod lug of the buffer are kept in a synchronous fixed state (fixed around the axial circumference of the buffer). Therefore, the main body structure formed by the upper rod body 2/the lower rod body 4 can rotate around the axis of the upper rod body 2/the lower rod body 4 within a certain angle range, and has the rotational freedom degree around the axis of the rod body. Meanwhile, the main structure formed by the upper rod body 2 and the lower rod body 4 can rotate around the spherical center of the joint bearing and is perpendicular to the straight line of the bolt 6 shaft (within a certain angle range), and has the rotational freedom degree around the axis. Namely, the end portions of the upper rod body 2 and the lower rod body 4 of the length limiting device 1 can be installed and rotated with two degrees of freedom, as shown in fig. 8. The two-position two-degree-of-freedom is beneficial to overcoming the mounting difficulty influence caused by the dislocation of the mounting positions on the buffer outer cylinder 12 and the piston rod 13 in the mounting process of the length locking device 1.

In other embodiments of the present application, the upper rod 2 is coaxially sleeved and contacted with the steering joint 15, the sleeved surface is coated with 7014 grease, the steering joint 15 can circumferentially rotate around the rod shaft of the upper rod 2, the upper end of the upper rod 2 is provided with the lock nut 14, the lock nut is provided with a U-shaped groove (shown in fig. 12), and the screw 16 is embedded into the U-shaped groove and screwed to the upper end of the upper rod 2, so that the lock nut 14 can be circumferentially stopped to achieve the anti-loose effect.

The matching relation between the steering joint 15 and the upper rod body 2 is beneficial to overcoming the mounting difficulty influence caused by the position dislocation of the mounting points of the outer cylinder and the piston rod of the buffer in the mounting process of the device.

The cylinder 3 has through-hole 19, and the through-hole 19 diameter is greater than 18 nail head diameters of screw, and screw 18 can pass through-hole 19 assembly screw in the body of rod 2, makes the body of rod 2 possess the vertical limit function in cylinder 3, goes up the body of rod 2 and can not pull out the cylinder 3 at the limit when the device uses.

The upper rod body 2 is provided with a step surface, and when the device is subjected to vertical load, the load is extruded and transmitted to the step surface of the upper rod body 2 from the steering joint 15 and then transmitted to the rod body, so that the device is favorable for bearing large load and cannot be damaged.

1. The upper rod body 2, the cylinder 3 and the lower rod body 4 are coaxial, the upper rod body 2 and the lower rod body 4 adopt reverse threads, and the two rod bodies are screwed into the cylinder cavity through the cylinder 3 to achieve the effect of lengthening and shortening the device. The operation method can reduce the length adjustment time of the device and is convenient and quick to use.

2. The diameter of the hole cavity of the upper rod body 2 is larger than that of the lower rod body 4, the upper rod body 2 is close to the lower rod body 4 in a screwing way, and the rod body 4 can be accommodated in the hole cavity of the upper rod body 2;

3. the installation positions of the end parts of the upper rod body 2 and the lower rod body 4 of the length limiting device 1 have double rotational degrees of freedom, and the installation posture and position can be adjusted during installation. Meanwhile, the device is suitable for adjustment and installation under the condition of dislocation of installation position points.

4. The upper end of the lower rod body 4 is provided with a limiting block 11, the diameter of the limiting block 11 is larger than that of the through hole at the lower part of the cylinder 3, and the lower rod body 4 can be prevented from being completely screwed out of the cylinder 3.

5. The tip notch cuttype boss under the upper rod body 2, boss diameter are greater than the through-hole diameter on the cylinder 3, can prevent to go up cylinder 2 and screw out cylinder 3 completely.

6. The matching surface of the steering joint 15 and the upper rod body 2 is coated with 7014 lubricating grease, the steering joint can rotate around the axis of the upper rod body 2 in the circumferential direction, and the matching relation between the steering joint 15 and the upper rod body 2 is beneficial to solving the problem of difficult installation caused by the position dislocation of the installation point of the outer cylinder and the piston rod of the buffer in the installation process of the device.

7. The upper rod body 2 has a step surface, and when the device is subjected to a vertical load, the load is transmitted to the step surface of the upper rod body 2 by being squeezed by the steering joint 15 and then transmitted to the rod body.

8. The upper end of the upper rod body 2 is provided with a U-shaped groove, and a screw 16 is embedded into the U-shaped groove and screwed to the upper end of the upper rod body 2, so that the locking nut 14 can be circumferentially stopped and prevented from loosening.

9. The cylinder 3 has through-hole 19, and the through-hole 19 diameter is greater than 18 nail head diameters of screw, and screw 18 can pass through-hole 19 assembly screw in the body of rod 2, makes the body of rod 2 possess the vertical limit function in cylinder 3, goes up the body of rod 2 and can not pull out the cylinder 3 at the limit when the device uses.

10. Knurling is processed on the surface of the cylinder 3, so that the cylinder is convenient for an operator to hold.

11. The steering knuckle 15 mounting tab has a width s, as shown in FIG. 11, that satisfies the design relationship

s >2[ (r + k) sina + b/2+t ]. Wherein

k: the distance between the lug piece arranged on the outer barrel of the buffer and the circle center of the outer barrel of the buffer

a is the deflection angle of the buffer

b: installing lug width for outer barrel of buffer

t: as a gap standard value

k. a and b are design parameters, and are determined when the buffer device is designed, the value a is related to the selection of the buffer mounting bearing, and after the mounting bearing is selected, a determined value a capable of rotating the angle exists. t is the industry requirement, satisfies structural clearance 2mm, and the minimum value 2mm can be expected in general design.

The length locking device has the following advantages:

1. the upper rod body 2 and the lower rod body 4 of the length limiting device 1 are screwed into the cylinder cavity through the cylinder 3 by adopting reverse threads, so that the device is extended and shortened. The operation method can reduce the length adjustment time of the device, is convenient and quick to use, and is simple and convenient to operate;

2. go up 2 vestibule diameters of the body of rod 2 be greater than with 4 pole diameters of the body of rod down, go up body of rod 2 and close closely with 4 spin closures of the body of rod down, body of rod 4 is accomodate in the 2 vestibules of the body of rod of going up, can make the shortest length that the device contracts reach littleer to effectively increase the length locking scope of device. The length locking of the helicopter undercarriage buffer with large change of the stroke range is facilitated.

3. The end positions of the upper rod body 2 and the lower rod body 4 of the length limiting device 1 have a double-freedom-degree adjusting function, and the double-freedom-degree adjustment of the two positions can compensate the installation angle under the condition that the installation positions of the buffer outer cylinder 12 and the piston rod 13 are circumferentially staggered, so that the installation alignment is convenient, and the problem of difficult installation is solved.

4. The end parts of the upper rod body 2 and the lower rod body 4 of the length limiting device 1 are installed with the installation joints 5, and standard fasteners are used, so that the replacement is easy;

5. the length limiting device 1 is simple in main body structure, small in number of used parts, compact in structure, light in weight and high in reliability.

6. The main body structure is stressed vertically, and the structure is simple and can bear the action of large vertical load.

Claims (8)

1. A multiple degree of freedom bumper length locking device, the locking device comprising:

a cylinder;

the upper rod body is connected with one end of the column body;

the lower rod body is connected with the other end of the column body;

the upper rod body and/or the lower rod body are/is connected with the mounting point of the buffer strut through the first joint.

2. The multiple degree of freedom bumper length locking device of claim 1, wherein the first joint comprises:

and the upper rod body and the lower rod body are connected with a mounting point on the buffering support through the mounting joint.

3. The multiple degree of freedom bumper length locking device of claim 1, wherein the first joint comprises:

and the upper rod body is connected with a mounting point on the buffer strut through the steering joint.

4. The multiple degree of freedom bumper length locking device of claim 2, wherein the ends of the upper and lower rods are provided with tabs, the tabs including tab holes.

5. The multiple degree of freedom bumper length locking device of claim 4, further comprising:

the joint bearing outer ring is arranged in the ear holes at the end parts of the upper rod body and the lower rod body;

the joint bearing inner ring is arranged in the joint bearing outer ring;

and the bolt penetrates through the inner ring of the joint bearing to connect the mounting joint with the upper rod body and the lower rod body.

6. The multiple degree of freedom bumper length locking device of claim 5, wherein the mount joint comprises:

a through hole through which the bolt can pass;

an open slot communicated with the through hole; the lug plates at the end parts of the upper rod body and the lower rod body can be placed in the open grooves.

7. The multiple degree of freedom bumper length locking device of claim 6, wherein the installation joint further comprises:

and a mounting piece which can be connected with a mounting point on the buffer support.

8. The multiple degree of freedom bumper length locking device of claim 7, wherein the bumper post includes:

the outer cylinder is provided with an upper mounting point;

the piston rod is connected with the outer barrel, and a lower mounting point is arranged on the piston rod; wherein a mounting tab on the mounting joint is connectable with the upper mounting point and the lower mounting point.

Images