Self-adaptive variable damping limiting folding device and system

Abstract

The invention provides a self-adaptive variable damping limiting folding device and system.The self-adaptive variable damping limiting folding device is characterized in that a first inner cylinder sealing ring and a second inner cylinder sealing ring are mounted in corresponding sealing ring mounting grooves in the two ends of an inner cylinder, and the inner cylinder is inserted into an outer cylinder; the outer cylinder, the inner cylinder, the first inner cylinder sealing ring and the second inner cylinder sealing ring form a closed hydraulic oil space; the connecting piece is inserted from one end of the outer cylinder and attached to the end face of the outer cylinder, the connecting piece and the outer cylinder are connected into a whole, the connecting piece is connected with the fixing piece at the other end of the outer cylinder so as to connect the outer cylinder and the inner cylinder together, and it is guaranteed that the inner cylinder and the outer cylinder can freely rotate; one end of the outer cylinder is provided with an oil injection hole and an oil discharge hole which are blocked by a sealing piece; the adjustable flow plug is inserted into the inner cylinder through a hole in the end face of the inner cylinder. The helicopter tail folding and limiting device has a passive self-adaptive variable damping limiting function, rotation folding exceeds a certain speed, damping self-adaptive automatic increase is achieved, additional control means are not needed, the mechanical limiting function can be achieved, the structure is simple, basic damping adjustment is convenient, and the folding and limiting problem of the helicopter tail is effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of helicopter design, and in particular relates to an adaptive variable damping limit folding device and system. Background Art

[0002] In the field of helicopter design, most folding limit structures are single pure mechanical limit structures. They can only be mechanically limited after folding into place, and additional buffer devices are used to prevent impact. It is impossible to limit the folding speed during the folding process, and it is impossible to avoid accidents caused by sudden situations such as gusts or ship shaking during the folding process. Folding damping can ensure that the folding is carried out at the set speed during the folding process. If there are sudden situations such as gusts or ship shaking, causing the folding speed to be out of control, that is, the speed suddenly increases, the passive adaptive increase of damping can effectively limit the speed increase, avoid accidents, and protect personnel safety.

[0003] Therefore, it is necessary to design a folding damping device with a passive adaptive variable damping limit function. Summary of the invention

[0004] In order to solve the problem of helicopter tail folding limit, the present invention proposes a folding damping device with passive adaptive variable damping limit function, which can adjust the damping adaptively according to the rotation folding speed, and realize the limit function after folding into place; the basic damping can be set according to the actual folding speed requirements, and on this basis, the faster the speed, the greater the damping, and the nonlinear increase of the damping force is realized, so as to avoid the risk of collision due to excessive speed in sudden situations. The technical scheme is as follows:

[0005] In a first aspect, an adaptive variable damping limit folding device is provided, characterized by a connecting member 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 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 fits with the end surface of the outer cylinder 5. The connecting piece 2 and the outer cylinder 5 are connected as a whole. The connecting piece 2 is connected to a fixing piece at the other end of the outer cylinder 5 to connect the outer cylinder 5 and the inner cylinder 7 together, and ensure that the inner cylinder and the outer cylinder can rotate freely relative to each other.

[0008] One end of the outer cylinder 5 is provided with holes for oil filling and oil discharge, and is sealed with a seal;

[0009] The adjustable flow plug 9 is inserted into the inner cylinder 7 through a hole on the end surface of the inner cylinder 7 .

[0010] Optionally, the inner cylinder 7 is provided with blocks 7-1 and 7-4 distributed at 180 degrees on its circumference, and the outer cylinder 5 is provided with blocks 5-1 and 5-2 distributed at 180 degrees on its circumference, the blocks 7-1 and 7-4 are arranged alternately with the blocks 5-1 and 5-2, and the connecting line of the blocks 7-1 and 7-4 is perpendicular to the connecting line of the blocks 5-1 and 5-2, and the widths of the blocks 7-1 and 7-4 and the blocks 5-1 and 5-2 are equal and less than half of the inner diameter of the outer cylinder 5.

[0011] A throttling slit 7-2 is provided on the block 7-1 along the length direction, and a throttling slit 7-3 is provided on the block 7-4 along the length direction. The widths of the throttling slits 7-2 and 7-3 are less than 0.5 mm. The internal space of the adaptive variable damping limit folding device is divided into four cavities by the blocks 7-1 and 7-4 on the inner cylinder 7 and the blocks 5-1 and 5-2 on the outer cylinder 5. The hydraulic oil in each cavity can only flow through the throttling slits 7-2 and 7-3 on the inner cylinder 7.

[0012] When the inner cylinder and the outer cylinder rotate relative to each other, the hydraulic oil inside them flows between the cavities through the throttling slits to generate damping. The size of the damping can be changed by adjusting the size of the throttling slits. When the inner cylinder and the outer cylinder rotate relative to each other, the stoppers 7-1 and 7-4 on the inner cylinder and the stoppers 5-1 and 5-2 on the outer cylinder are abutted against each other to achieve position limiting. 3. The device according to claim 2 is characterized in that the cross-section of the stoppers 5-1 and 5-2 is a missing-angle sector, and the angle of the missing-angle sector is determined according to the maximum relative rotation angle of the inner cylinder 7 and the outer cylinder 5.

[0013] Optionally, the adjustable flow plug 9 comprises two parts: an elastic throttling adjustment plate 9-1 and an adjustable flow plug column 9-2, the elastic throttling adjustment plate 9-1 is screwed to the head of the adjustable flow plug column 9-2, and the upper part of the adjustable flow plug column 9-2 is threadedly connected to the inner tube 7 and sealed with a sealing gasket 10.

[0014] Among them, when it is necessary to adjust the basic damping, adjust the screwing length of the adjustable flow plug column 9-2 on the inner tube 7 to adjust the basic damping. The larger the screwing length, the smaller the size of the throttling gap and the larger the basic damping; the smaller the screwing length, the larger the size of the throttling gap and the smaller the basic damping.

[0015] Among them, when it is necessary to design the upper limit of the folding speed, the stiffness of the elastic throttling adjustment piece 9-1 is designed to adjust the damping gradient of the damping that changes with the folding speed during rotational folding. The greater the folding speed, the greater the impact of the hydraulic oil on the elastic throttling adjustment piece through the throttling gap. The elastic throttling adjustment piece deforms under the impact, reducing the size of the elastic throttling adjustment gap to increase the damping. The greater the speed, the greater the damping gradient, which can quickly increase the resistance and effectively reduce the rotational folding speed.

[0016] Optionally, the fixing member includes a washer 11 and a connecting nut 12 .

[0017] Optionally, the sealing member includes a sealing gasket 4 and a sealing bolt 3 .

[0018] In the second aspect, an adaptive variable damping limit folding system is provided, comprising an adaptive variable damping limit folding device as described in any one of the first aspects, and a folding end and a fixed end; the folding end is connected to the inner cylinder of the adaptive variable damping limit folding device, and the fixed end is connected to the outer cylinder of the adaptive variable damping limit folding device.

[0019] Optionally, the fixed end is a helicopter tail beam, and the folding end is a helicopter tail oblique beam.

[0020] The beneficial effects of the present invention are at least:

[0021] The present invention proposes an adaptive variable damping limit folding device, which has a passive adaptive variable damping limit function. When the rotation and folding speed exceeds a certain speed, the damping is adaptively increased automatically without the need for additional control means, and the function of mechanical limit can be realized. The structure is simple, and the basic damping is convenient to adjust, which effectively solves the problem of folding limit of the tail of a helicopter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the adaptive variable damping limit folding device;

[0023] Figure 2 It is a schematic diagram of the composition of the adaptive variable damping limit folding device;

[0024] Figure 3 is a schematic diagram of an adjustable flow plug;

[0025] Figure 4 It is a schematic diagram of the inner cylinder structure;

[0026] Figure 5 It is a schematic diagram of the outer cylinder structure;

[0027] Figure 6 This is a schematic diagram of the interior of the adaptive variable damping limit folding device. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below through specific implementation modes and drawings.

[0029] The present invention integrates folding damping and folding angle limiting. The passive adaptive variable damping limit folding device realizes the corresponding damping torque requirements at different folding speeds, which can ensure the safety of helicopter components and maintenance personnel. At the same time, the folding damping device has the function of limiting the angle of the tail beam after folding.

[0030] See also Figure 1 , Figure 2 and Figure 6An embodiment of the present invention provides an adaptive variable damping limit folding device, comprising a connecting bolt 1, a connecting piece 2, a sealing bolt 3, a sealing gasket 4, an outer cylinder 5, an inner cylinder sealing ring 6, an inner cylinder 7, an inner cylinder sealing ring 8, an adjustable flow plug 9, a sealing gasket 10, a washer 11, and a connecting nut 12.

[0031] The inner cylinder seal ring 6 and the inner cylinder seal ring 8 are installed in the corresponding seal 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 seal ring form a closed hydraulic oil space.

[0032] The connector 2 is inserted from the outer cylinder side, fits with the end face of the outer cylinder, and is connected to the outer cylinder as a whole with the connecting bolt 1. The outer cylinder and the inner cylinder are connected together with the washer 11 and the connecting nut 12 on the other side, and it is ensured that the inner cylinder and the outer cylinder can rotate freely relative to each other.

[0033] One side of the outer cylinder is provided with holes for oil filling and oil discharge, which are sealed with a sealing gasket 4 and a sealing bolt.

[0034] See also Figure 3 The adjustable flow plug 9 includes two parts: an elastic throttling adjustment sheet 9-1 and an adjustable flow plug column 9-2. The elastic throttling adjustment sheet is screwed to the head of the adjustable flow plug column. The adjustable flow plug 9 is inserted into the inner cylinder through the hole on the end face of the inner cylinder, and is connected to the inner cylinder through the thread on the upper part of the adjustable flow plug column and is sealed with a sealing gasket 10.

[0035] The internal space of the adaptive variable damping limit folding device is divided into four areas by the blocks 7-1, 7-4 on the inner cylinder and the blocks 5-1, 5-2 on the outer cylinder. The hydraulic oil in each area can only flow through the throttling joints 7-2, 7-3 on the inner cylinder.

[0036] When the inner cylinder and the outer cylinder rotate relative to each other, the hydraulic oil inside them flows between the cavities through the throttle joints to generate damping. The size of the damping can be changed by adjusting the size of the throttle joints.

[0037] The stoppers on the inner tube and the outer tube are designed according to the folding limit angle. When the inner tube is rotated to the right position, the stoppers 7-1 and 7-4 on the inner tube and the stoppers 5-1 and 5-2 on the outer tube are pressed against each other for limit.

[0038] See also Figure 4 and Figure 5 The side walls of the blocks 5-1 and 5-2 on the outer tube are respectively attached with elastic pads 5-3 and 5-4. When the blocks 5-1 and 5-2 are pressed against each other for limiting, the elastic pads 5-3 and 5-4 are respectively in contact with the side walls of the blocks 7-1 and 7-4 on the inner tube, which can play a role in preventing impact.

[0039] The cross section of the stoppers 5-1 and 5-2 is a notch sector, and the angle of the notch sector is determined according to the maximum relative rotation angle between the inner cylinder 7 and the outer cylinder 5. Assuming the maximum relative rotation angle is a, the angle of the notch sector = 90 degrees - a.

[0040] The working principle of the present invention is as follows:

[0041] When the basic damping needs to be adjusted, the basic damping is adjusted by adjusting the screwing length of the adjustable flow plug column 9-2 on the inner cylinder. The larger the screwing length, the smaller the size of the throttle joint, and the larger the basic damping; the smaller the screwing length, the larger the size of the throttle joint, and the smaller the basic damping. The purpose of adjusting the basic damping is to have a suitable resistance at the set folding speed, so that the folding will not be difficult due to excessive resistance, or the folding speed will not be difficult to control due to too small resistance.

[0042] When it is necessary to design the upper limit of the folding speed, the damping gradient of the damping that changes with the speed during rotational folding can be adjusted through the stiffness design of the elastic throttling adjustment piece 9-1. The greater the speed, the greater the impact of the hydraulic oil on the throttling adjustment piece through the throttling joint. The throttling adjustment piece deforms under the impact, and the size of the throttling adjustment joint is reduced to increase the damping. The greater the speed, the greater the damping gradient, which can quickly increase the resistance and effectively reduce the rotational folding speed. When folding at the set folding speed, it is most ergonomic, and the stability and controllability of the person are the best. Exceeding this speed will cause the folding stability of the person to deteriorate, which is not conducive to dealing with various emergencies. Therefore, it is necessary to control the maximum speed through the elastic throttling adjustment piece 9-1. When the speed exceeds the limit, the resistance increases sharply and the speed decreases to ensure the safety of the personnel.

[0043] An embodiment of the present invention also provides an adaptive variable damping limit folding system, comprising an adaptive variable damping limit folding device provided by the present invention, as well as a folding end and a fixed end; the folding end is connected to the inner cylinder of the adaptive variable damping limit folding device, and the fixed end is connected to the outer cylinder of the adaptive variable damping limit folding device.

[0044] Among them, the fixed end is the helicopter tail beam, and the folding end is the helicopter tail oblique beam.

[0045] The working process of the system is as follows: the outer cylinder of the adaptive variable damping limit folding device is fixed on the helicopter tail beam through four fixed points A thereon, and the inner cylinder is fixed to the tail oblique beam through four fixed points B thereon. The folding axis center of the tail oblique beam is the rotation center of the adaptive variable damping limit folding device. When the oblique beam is folded, the inner cylinder of the adaptive variable damping limit folding device rotates relative to the outer cylinder. The hydraulic oil in the adaptive variable damping limit folding device flows in four cavities through the throttling slot to generate appropriate damping. When an emergency occurs, the folding speed of the tail oblique beam suddenly increases, the operator stands unsteadily, the speed of the hydraulic oil flowing through the throttling slot increases, the elastic throttling adjustment plate is deformed, resulting in a reduction in the size of the throttling slot, the damping resistance suddenly increases, and the speed decreases. The operator stabilizes and controls the oblique beam again. When folded into place, the elastic pads 5-3 and 5-4 on the side walls of the blocks 5-1 and 5-2 on the outer cylinder are in contact with the side walls of the blocks 7-1 and 7-4 on the inner cylinder, respectively, to limit the position reliably and avoid collision between the tail oblique beam and the tail beam.

[0046] The key points of the present invention are as follows:

[0047] 1. Mechanically reliable limit is achieved through the stopper design of the inner and outer barrels;

[0048] 2. The symmetrically designed throttle plug cylinder can effectively adjust the basic damping according to actual needs. The adjustment method is simple and convenient, and it can be easily adjusted without removing the adaptive variable damping limit folding device;

[0049] 3. Through the stiffness design of the elastic throttling adjustment piece, adaptive damping control can be achieved to ensure the nonlinear increase of the damping force beyond a certain speed, effectively avoiding the situation where the rotation and folding speed is too fast.

[0050] The above only expresses the implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. In addition, the parts not detailed in the present invention are all conventional technologies.

Claims

1. An adaptive variable damping limit folding device, characterized in that: include: Connecting piece (2), outer tube (5), first inner tube sealing ring (6), inner tube (7), second inner tube sealing ring (8), adjustable flow plug (9), and sealing gasket (10); 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; The connecting piece (2) is inserted from one end of the outer cylinder (5) and fits with the end surface of the outer cylinder (5). The connecting piece (2) and the outer cylinder (5) are connected as a whole. The connecting piece (2) is connected to a fixing piece at the other end of the outer cylinder (5) to connect the outer cylinder (5) and the inner cylinder (7) together, ensuring that the inner cylinder and the outer cylinder can rotate freely relative to each other. One end of the outer cylinder (5) is provided with holes for oil injection and oil discharge, which are sealed with a sealing member; the adjustable flow plug (9) is inserted into the inner cylinder (7) through the hole on the end surface of the inner cylinder (7).

2. The device according to claim 1, characterized in that The inner cylinder (7) is provided with a first stopper (7-1) and a second stopper (7-4) distributed at 180 degrees on the circumference, and the outer cylinder (5) is provided with a third stopper (5-1) and a fourth stopper (5-2) distributed at 180 degrees on the circumference; the first stopper (7-1), the second stopper (7-4) and the third stopper (5-1), the fourth stopper (5-2) are arranged alternately, and the connecting line of the first stopper (7-1) and the second stopper (7-4) is perpendicular to the connecting line of the third stopper (5-1) and the fourth stopper (5-2); the widths of the first stopper (7-1), the second stopper (7-4), the third stopper (5-1), and the fourth stopper (5-2) are equal and less than half of the inner diameter of the outer cylinder (5); A first throttling slit (7-2) is provided on the first stopper (7-1) along the length direction, and a second throttling slit (7-3) is provided on the second stopper (7-4) along the length direction. The widths of the first throttling slit (7-2) and the second throttling slit (7-3) are less than 0.5 mm. The internal space of the adaptive variable damping limit folding device is divided into four cavities by the first stopper (7-1) and the second stopper (7-4) on the inner cylinder (7) and the third stopper (5-1) and the fourth stopper (5-2) on the outer cylinder (5). The hydraulic oil in each cavity can only flow through the first throttling slit (7-2) and the second throttling slit (7-3) on the inner cylinder (7).

3. The device according to claim 2, characterized in that The cross-sections of the third stopper 5-1 and the fourth stopper 5-2 are in the shape of a missing corner sector, and the angle of the missing corner sector is determined according to the maximum relative rotation angle between the inner cylinder (7) and the outer cylinder (5).

4. The device according to claim 1, characterized in that The adjustable flow plug (9) comprises two parts: an elastic throttling adjustment plate (9-1) and an adjustable flow plug column (9-2), wherein the elastic throttling adjustment plate (9-1) is threadedly connected to the head of the adjustable flow plug column (9-2), and the upper part of the adjustable flow plug column (9-2) is threadedly connected to the inner tube (7) and sealed with a sealing gasket (10).

5. The device according to claim 4, characterized in that When the basic damping needs to be adjusted, the screwing length of the adjustable flow plug column (9-2) on the inner cylinder (7) is adjusted to adjust the basic damping. The larger the screwing length, the smaller the size of the throttling gap and the larger the basic damping; the smaller the screwing length, the larger the size of the throttling gap and the smaller the basic damping.

6. The device according to claim 4, characterized in that When it is necessary to design an upper limit of the folding speed, the stiffness of the elastic throttling adjustment piece (9-1) is designed to adjust the damping gradient of the damping that changes with the folding speed during rotational folding. The greater the folding speed, the greater the impact of the hydraulic oil on the elastic throttling adjustment piece through the throttling gap. The elastic throttling adjustment piece deforms under the impact, reducing the size of the elastic throttling adjustment gap to increase the damping. The greater the speed, the greater the damping gradient, which can quickly increase the resistance and reduce the rotational folding speed.

7. The device according to claim 1, characterized in that The fixing member comprises a washer (11) and a connecting nut (12).

8. The device according to claim 1, characterized in that The sealing element comprises a sealing pad (4) and a sealing bolt (3).

9. An adaptive variable damping limit folding system, characterized in that: It comprises an adaptive variable damping position limiting folding device as described in any one of claims 1 to 7, as well as a folding end and a fixed end; wherein the folding end is connected to the inner cylinder of the adaptive variable damping position limiting folding device, and the fixed end is connected to the outer cylinder of the adaptive variable damping position limiting folding device.

10. The system according to claim 9, characterized in that The fixed end is the helicopter tail beam, and the folding end is the helicopter tail diagonal beam.

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