An adaptive variable-damping position-limiting folding device and system
By using an adaptive variable damping limit device, and utilizing the inner and outer cylinder blocks and throttling slot design, the damping force is adaptively increased with speed, which solves the problem of uncontrolled helicopter folding speed and ensures safety and stability.
Patent Information
- Application Number
- CN202411441008.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2044-10-16
AI Technical Summary
Existing helicopter folding and limiting structures cannot limit speed during the folding process, which can easily lead to loss of speed control due to sudden situations, posing an accident risk.
An adaptive variable damping limiting device is designed. Through the design of the inner and outer cylinders' stops and throttling gaps, the damping force is adaptively adjusted according to the rotation speed to achieve nonlinear increase of damping to limit the speed, combined with mechanical limiting function.
It effectively avoids loss of control over folding speed, ensures the safety and stability of the folding process, protects personnel safety, and has a simple structure that is easy to adjust.
Smart Images
Figure CN119435619B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of helicopter design, and particularly relates to a self-adaptive variable-damping limiting and folding device and system. BACKGROUND
[0002] In the field of helicopter design, the folding limiting structure is mostly a single pure mechanical structure limiting, which can only limit through a mechanical limiting after being folded in place, and prevent impact through an additional buffer device, and cannot limit the folding speed during folding, and cannot avoid accidents caused by sudden wind or ship shaking during folding. The folding damping can ensure folding at a set speed during folding, and if sudden wind or ship shaking occurs, the speed will suddenly increase, and the damping is passively and adaptively increased to effectively limit the speed increase and avoid accidents and protect personnel safety.
[0003] Therefore, it is necessary to design a folding damping device with passive adaptive variable-damping limiting function. SUMMARY
[0004] In order to solve the problem of folding limiting of the tail of a helicopter, the application provides a folding damping device with passive adaptive variable-damping limiting function, which can adaptively adjust the damping according to the rotating folding speed, and realize the limiting function after being folded in place; the basic damping can be set according to the actual folding speed requirement, and the damping is increased with the speed on this basis, realizing the nonlinear increase of damping force, avoiding the collision risk caused by sudden speed increase. The technical scheme is as follows:
[0005] In the first aspect, a self-adaptive variable-damping limiting and folding device is provided, which comprises a connecting piece 2, an outer cylinder 5, a first inner cylinder sealing ring 6, an inner cylinder 7, a second inner cylinder sealing ring 8, an adjustable flow plug 9, and a first sealing gasket 10.
[0006] The first inner cylinder sealing ring 6 and the second inner cylinder sealing ring 8 are installed in the corresponding sealing ring installation grooves at both ends of the inner cylinder 7, and the inner cylinder 7 is inserted into the outer cylinder 5; the outer cylinder, the inner cylinder, and the first inner cylinder sealing ring 6 and the second inner cylinder sealing ring 8 form a closed hydraulic oil space;
[0007] The connecting piece 2 is inserted from one end of the outer cylinder 5, and is attached to the end face of the outer cylinder 5, the connecting piece 2 is integrated with the outer cylinder 5, and the connecting piece 2 is connected with a fixing piece at the other end of the outer cylinder 5, so as to connect the outer cylinder 5 and the inner cylinder 7 together, and ensure that the inner cylinder and the outer cylinder can freely rotate relative to each other;
[0008] One end of the outer cylinder 5 is provided with an oil injection and discharge hole, which is sealed by a sealing piece;
[0009] The adjustable flow plug 9 is inserted into the inner cylinder 7 through the hole in the end face of the inner cylinder 7.
[0010] The inner cylinder 7 is provided with blocks 7-1, 7-4 distributed at 180 degrees, and the outer cylinder 5 is provided with blocks 5-1, 5-2 distributed at 180 degrees. The blocks 7-1, 7-4 and the blocks 5-1, 5-2 are staggered, and the lines of the blocks 7-1, 7-4 are perpendicular to the lines of the blocks 5-1, 5-2. The widths of the blocks 7-1, 7-4 and the blocks 5-1, 5-2 are equal and less than half of the inner diameter of the outer cylinder 5.
[0011] The block 7-1 is provided with a throttling gap 7-2 along the length direction, and the block 7-4 is provided with a throttling gap 7-3 along the length direction. The widths of the throttling gaps 7-2 and 7-3 are less than 0.5 mm. The internal space of the self-adaptive variable damping and limiting folding device is divided into four cavities by the blocks 7-1, 7-4 on the inner cylinder 7 and the blocks 5-1, 5-2 on the outer cylinder 5. The hydraulic oil in each cavity can only flow to each other through the throttling gaps 7-2, 7-3 on the inner cylinder 7.
[0012] When the inner cylinder and the outer cylinder rotate relative to each other, the hydraulic oil in the internal space flows between the cavities through the throttling gaps, generating damping. By adjusting the size of the throttling gaps, the size of the damping can be changed. When rotating to the position, the blocks 7-1, 7-4 on the inner cylinder and the blocks 5-1, 5-2 on the outer cylinder abut against each other to realize limiting.
[0013] Optionally, the cross section of the block 5-1, 5-2 is a scalene sector, and the angle of the scalene sector is determined according to the maximum relative rotation angle of the inner cylinder 7 and the outer cylinder 5.
[0014] Optionally, the adjustable throttling plug 9 includes two parts: an elastic throttling adjusting piece 9-1 and an adjustable throttling plug body 9-2. The elastic throttling adjusting piece 9-1 is screwed on the head of the adjustable throttling plug body 9-2. The thread on the upper part of the adjustable throttling plug body 9-2 is connected to the inner cylinder 7 and sealed by the first sealing gasket 10.
[0015] When the basic damping needs to be adjusted, the screwed length of the adjustable throttling plug body 9-2 in the inner cylinder 7 is adjusted to adjust the basic damping. The greater the screwed length, the smaller the size of the throttling gap, and the greater the basic damping. The smaller the screwed length, the greater the size of the throttling gap, and the smaller the basic damping.
[0016] When the upper limit of the folding speed needs to be designed, the rigidity of the elastic throttling adjusting piece 9-1 is designed to adjust the damping gradient of the damping changing with the folding speed when rotating and folding. The greater the folding speed, the greater the impact of the hydraulic oil on the elastic throttling adjusting piece through the throttling gap, and the greater the deformation of the elastic throttling adjusting piece under the impact, which reduces the size of the elastic throttling adjusting gap and makes the damping larger. The greater the speed, the greater the damping gradient, which can quickly increase the resistance and effectively reduce the rotating folding speed.
[0017] Optionally, the fixing member comprises a gasket 11 and a connecting nut 12.
[0018] Optionally, the sealing member comprises a second sealing gasket 4 and a sealing bolt 3.
[0019] In a second aspect, the application provides a self-adaptive variable-damping limiting folding system, comprising the self-adaptive variable-damping limiting folding device of any one of the first aspect, and a folding end and a fixed end; the folding end is connected with the inner cylinder of the self-adaptive variable-damping limiting folding device, and the fixed end is connected with the outer cylinder of the self-adaptive variable-damping limiting folding device.
[0020] Optionally, the fixed end is a tail beam of a helicopter, and the folding end is a tail diagonal beam of the helicopter.
[0021] The application has at least the following beneficial effects:
[0022] The application provides a self-adaptive variable-damping limiting folding device, which has a passive self-adaptive variable-damping limiting function, the damping is automatically increased when the rotation folding speed exceeds a certain speed, no additional control means is needed, the mechanical limiting function can be realized, the structure is simple, the basic damping adjustment is convenient, and the problem of folding limiting of a tail part of a helicopter is effectively solved. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 Fig. 1 is a structural schematic diagram of a self-adaptive variable-damping limiting folding device;
[0024] Figure 2 Fig. 2 is a component schematic diagram of the self-adaptive variable-damping limiting folding device;
[0025] Figure 3 Fig. 3 is a schematic diagram of an adjustable flow plug;
[0026] Figure 4 Fig. 4 is a structural schematic diagram of an inner cylinder;
[0027] Figure 5 Fig. 5 is a structural schematic diagram of an outer cylinder;
[0028] Figure 6 Fig. 6 is an internal schematic diagram of the self-adaptive variable-damping limiting folding device. DETAILED DESCRIPTION
[0029] The application will be further described in detail below through specific embodiments and drawings.
[0030] The application integrates folding damping and folding angle limiting. The passive self-adaptive variable-damping limiting folding device can meet the corresponding damping torque requirement at different folding speeds, can guarantee the safety of a helicopter part and a maintenance personnel, and the folding damping device has an angle limiting function after the tail diagonal beam is folded.
[0031] Reference is made to Figure 1、 Figure 2 And Figure 6 An embodiment of the present application provides a self-adaptive variable damping limiting folding device, comprising a connecting bolt 1, a connecting piece 2, a sealing bolt 3, a second sealing gasket 4, an outer cylinder 5, a first inner cylinder sealing ring 6, an inner cylinder 7, a second inner cylinder sealing ring 8, an adjustable flow plug 9, a first sealing gasket 10, a gasket 11, and a connecting nut 12.
[0032] The first inner cylinder sealing ring 6 and the second inner cylinder sealing ring 8 are installed into corresponding sealing ring installation grooves at both ends of the inner cylinder 7, and the inner cylinder 7 is inserted into the outer cylinder 5. The outer cylinder, the inner cylinder, and the inner cylinder sealing ring form a closed hydraulic oil space.
[0033] The connecting piece 2 is inserted from the outer cylinder side, is attached to the outer cylinder end face, is connected to the outer cylinder as a whole by the connecting bolt 1, and is connected to the outer cylinder and the inner cylinder together on the other side by the gasket 11 and the connecting nut 12, and ensures that the inner cylinder and the outer cylinder can freely rotate relative to each other.
[0034] An oil injection and discharge hole is formed on one side of the outer cylinder, and is blocked by the second sealing gasket 4 and the sealing bolt.
[0035] Referring to Figure 3 The adjustable flow plug 9 comprises two parts: an elastic throttling adjusting piece 9-1 and an adjustable flow plug body 9-2, the elastic throttling adjusting piece is screwed on the head of the adjustable flow plug body, the adjustable flow plug 9 is inserted into the inner cylinder through a hole in the end face of the inner cylinder, is connected to the inner cylinder through the threads on the upper part of the adjustable flow plug body, and is sealed by the first sealing gasket 10.
[0036] The internal space of the self-adaptive variable damping limiting folding device is divided into four areas by the stop blocks 7-1, 7-4 on the inner cylinder and the stop blocks 5-1, 5-2 on the outer cylinder, and the hydraulic oil in each area can only flow to each other through the throttling orifices 7-2, 7-3 on the inner cylinder.
[0037] When the inner cylinder and the outer cylinder rotate relative to each other, the hydraulic oil in the inner cylinder flows between the cavities through the throttling orifices, generates damping, and the size of the damping can be changed by adjusting the size of the throttling orifices.
[0038] The stop blocks on the inner cylinder and the stop blocks on the outer cylinder are designed according to the angle of the folding limiting, and when rotated to the position, the stop blocks 7-1, 7-4 on the inner cylinder and the stop blocks 5-1, 5-2 on the outer cylinder abut against each other to limit.
[0039] Referring to Figure 4 And Figure 5 The side walls of the stop blocks 5-1, 5-2 on the outer cylinder are respectively pasted with elastic pads 5-3, 5-4, and when the stop blocks 5-1, 5-2 abut against each other to limit, the elastic pads 5-3, 5-4 respectively contact the side walls of the stop blocks 7-1, 7-4 on the inner cylinder, and can play a role in preventing impact.
[0040] The cross section of the stop block 5-1, 5-2 is a scalene sector, and the angle of the scalene sector is determined according to the maximum relative rotation angle of the inner cylinder 7 and the outer cylinder 5. Assuming that the maximum relative rotation angle is a, the angle of the scalene sector = 90 degrees - a.
[0041] The working principle of the present application is as follows:
[0042] When the basic damping needs to be adjusted, the basic damping is adjusted by adjusting the screwed length of the adjustable flow plug column 9-2 on the inner cylinder. The greater the screwed length, the smaller the size of the throttle meeting, and the greater the basic damping. The smaller the screwed length, the greater the size of the throttle meeting, and the smaller the basic damping. The effect of adjusting the basic damping is to have appropriate resistance at the set folding speed, and it will not appear that the folding is difficult due to too large resistance, or the folding speed is not easy to control due to too small resistance.
[0043] When the upper limit of the folding speed needs to be designed, the damping gradient of the damping changing with the speed during the rotation folding can be adjusted by the rigidity design of the elastic throttle adjusting piece 9-1. The greater the speed, the greater the impact of the hydraulic oil on the throttle adjusting piece through the throttle meeting, the deformation of the throttle adjusting piece under the impact, the reduction of the size of the throttle adjusting meeting, and the increase of the damping. The greater the speed, the greater the damping gradient, which can rapidly increase the resistance and effectively reduce the rotation folding speed. At the set folding speed, the folding is most in line with ergonomics, and the stability and control of the person are best. Exceeding this speed will lead to poor folding stability of the person, which is not conducive to dealing with various emergencies, so the elastic throttle adjusting piece 9-1 is needed to control the maximum speed. When the limited speed is exceeded, the resistance is sharply increased, and the speed is decreased to ensure the safety of the personnel.
[0044] An embodiment of the present application also provides a self-adaptive variable damping limiting folding system, which comprises a self-adaptive variable damping limiting folding device provided by the present application, and a folding end and a fixed end. The folding end is connected with the inner cylinder of the self-adaptive variable damping limiting folding device, and the fixed end is connected with the outer cylinder of the self-adaptive variable damping limiting folding device.
[0045] Among them, the fixed end is a helicopter tail beam, and the folding end is a helicopter tail diagonal beam.
[0046] The system working process is as follows: the outer cylinder of the adaptive variable damping limiting folding device is fixed on the tail beam of the helicopter through four fixed points A on it, the inner cylinder is fixed to the tail diagonal beam through four fixed points B on it, the folding pivot center of the tail diagonal beam is the rotation center of the adaptive variable damping limiting folding device, when the diagonal beam is folded, the inner cylinder of the adaptive variable damping limiting folding device rotates relative to the outer cylinder, the hydraulic oil in the adaptive variable damping limiting folding device flows in the four cavities through the throttle gap to generate appropriate damping, when an emergency occurs, the folding speed of the tail diagonal beam suddenly increases, the operator stands unsteadily, the hydraulic oil flowing through the throttle gap increases in speed, the elastic throttle adjusting piece deforms, causing the size of the throttle gap to decrease, the damping resistance suddenly increases, the speed decreases, the operator stabilizes the control of the diagonal beam again, when the folding is in place, the stop blocks 5-1 and 5-2 on the side wall of the outer cylinder are in contact with the stop blocks 7-1 and 7-4 on the side wall of the inner cylinder respectively, reliable limiting is achieved, and the tail diagonal beam and the tail beam are avoided from colliding.
[0047] The key points of the present application are as follows:
[0048] 1. Mechanical reliable limiting is achieved through the stop block design of the inner and outer barrels.
[0049] 2. The basic damping can be effectively adjusted according to actual needs through the symmetrically designed throttle plug column body, the adjustment method is simple and convenient, and the adjustment can be conveniently made without disassembling the adaptive variable damping limiting folding device.
[0050] 3. Adaptive damping control can be achieved through the rigidity design of the elastic throttle adjusting piece, the damping force is ensured to increase nonlinearly beyond a certain speed, and the situation of excessively fast folding rotation is effectively avoided.
[0051] The above only expresses the embodiments of the present application, the description is relatively specific and detailed, but it cannot be understood as limiting the patent scope. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. In addition, the parts not described in detail in the present application are all conventional technologies.
Claims
1. A self-adapting variable-damping position-limiting folding device, characterized in that, The application relates to a self-adapting variable-damping limiting and folding device. The device comprises a connecting piece (2), an outer cylinder (5), a first inner cylinder sealing ring (6), an inner cylinder (7), a second inner cylinder sealing ring (8), an adjustable flow plug (9) and a first sealing gasket (10); the first inner cylinder sealing ring (6) and the second inner cylinder sealing ring (8) are installed in corresponding sealing ring installation grooves at two ends of the inner cylinder (7) and the inner cylinder (7) is inserted into the outer cylinder (5); the outer cylinder, the inner cylinder and the first inner cylinder sealing ring (6) and the second inner cylinder sealing ring (8) form a closed hydraulic oil space; the connecting piece (2) is inserted into one end of the outer cylinder (5) and is attached to the end face of the outer cylinder (5); the connecting piece (2) is connected with the outer cylinder (5) to form an integrated whole; the connecting piece (2) is connected with a fixing piece at the other end of the outer cylinder (5) to connect the outer cylinder (5) and the inner cylinder (7) together, so that the inner cylinder and the outer cylinder can freely rotate relative to each other; an oil injection and discharge hole is formed in one end of the outer cylinder (5) and is sealed by a sealing piece; the adjustable flow plug (9) is inserted into the inner cylinder (7) through a hole in the end face of the inner cylinder (7); The inner cylinder (7) is provided with first and second stop blocks (7-1 and 7-4) which are distributed at 180 degrees on the circumference of the inner cylinder (7); the outer cylinder (5) is provided with third and fourth stop blocks (5-1 and 5-2) which are distributed at 180 degrees on the circumference of the outer cylinder (5); the first and second stop blocks (7-1 and 7-4) and the third and fourth stop blocks (5-1 and 5-2) are staggered; the connecting line of the first and second stop blocks (7-1 and 7-4) is perpendicular to the connecting line of the third and fourth stop blocks (5-1 and 5-2); the widths of the first, second, third and fourth stop blocks (7-1, 7-4, 5-1 and 5-2) are equal and less than half of the inner diameter of the outer cylinder (5); the first stop block (7-1) is provided with a first throttling slot (7-2) along the length direction; the second stop block (7-4) is provided with a second throttling slot (7-3) along the length direction; the widths of the first and second throttling slots (7-2 and 7-3) are less than 0.5 mm; the internal space of the self-adapting variable-damping limiting and folding device is divided into four cavities by the first and second stop blocks (7-1 and 7-4) on the inner cylinder (7) and the third and fourth stop blocks (5-1 and 5-2) on the outer cylinder (5); the hydraulic oil in each cavity can only flow to other cavities through the first and second throttling slots (7-2 and 7-3) on the inner cylinder (7); The adjustable flow plug (9) comprises two parts: an elastic throttling adjusting sheet (9-1) and an adjustable flow plug column body (9-2); the elastic throttling adjusting sheet (9-1) is screwed on the head of the adjustable flow plug column body (9-2); the screw thread on the upper part of the adjustable flow plug column body (9-2) is connected into the inner cylinder (7) and is sealed by the first sealing gasket (10); When the basic damping needs to be adjusted, the screwed length of the adjustable flow plug column body (9-2) in the inner cylinder (7) is adjusted to adjust the basic damping; the greater the screwed length, the smaller the size of the throttling slot and the greater the basic damping; the smaller the screwed length, the greater the size of the throttling slot and the smaller the basic damping. When the upper limit of folding speed needs to be designed, the damping gradient of the damping changing with the folding speed is adjusted by designing the rigidity of the elastic throttle adjusting piece (9-1), the greater the folding speed is, the greater the impact of the hydraulic oil on the elastic throttle adjusting piece through the throttle gap is, the elastic throttle adjusting piece is deformed under the impact, the size of the elastic throttle adjusting gap is reduced, the damping is increased, the greater the speed is, the greater the damping gradient is, the resistance can be rapidly increased, and the rotary folding speed is reduced.
2. The apparatus of claim 1, wherein, The third stop block (5-1) and the fourth stop block (5-2) are in the shape of a scalene sector, and the angle of the scalene sector is determined according to the maximum relative rotation angle of the inner cylinder (7) and the outer cylinder (5).
3. The apparatus of claim 1, wherein, The fixing member comprises a gasket (11) and a connecting nut (12).
4. The apparatus of claim 1, wherein The sealing member comprises a second sealing gasket (4) and a sealing bolt (3).
5. A self-adapting variable-damping limit folding system, characterized in that, The adaptive variable-damping limiting folding device comprises a folding end and a fixed end.
6. The system of claim 5, wherein, The fixed end is a tail beam of a helicopter, and the folding end is a tail diagonal beam of the helicopter.
Citation Information
Patent Citations
Adjustable damper device
CN104315070A
Damping device and valve comprising same
CN117006185A