Single-nozzle type undercarriage emergency release actuator cylinder

Abstract

The invention belongs to the technical field of hydraulic actuating cylinders, and particularly relates to a single-nozzle type undercarriage emergency release actuating cylinder which comprises a nozzle, a piston, a reset spring, a piston rod and an outer cylinder. The piston is connected with one end of the piston rod, the piston rod is sleeved with an outer cylinder opening, the piston is sleeved with an outer cylinder, the outer cylinder is divided into a rod cavity and a rodless cavity, the reset spring is installed in the rod cavity and provides pretightening force for the piston to move towards the rodless cavity, and the pipe nozzle is used for providing hydraulic oil for the actuator cylinder or discharging the hydraulic oil. The actuating cylinder adopts a single pipe nozzle and a cavity is additionally provided with a reset spring, the functions are not reduced when the actuating cylinder adopts double pipe nozzles, but the arrangement of one pipeline can be reduced by adopting the single pipe nozzle, the use space during pipeline arrangement is reduced, the weight of the arranged pipeline is reduced, and the whole cost is also reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of hydraulic actuators, and in particular relates to a single-nozzle landing gear emergency release actuator. Background Art

[0002] At present, the emergency release actuator of the landing gear is usually provided with two nozzles to provide unlocking force to the emergency release actuator during emergency release. When unlocking, one nozzle passes normal pressure and the other nozzle passes return oil, thereby unlocking the upper lock of the landing gear. However, this actuator requires the hydraulic system to arrange two pipelines to connect with the emergency release actuator, which increases the complexity of the layout, the occupation of space and the weight of the entire system. Therefore, the use of a single-nozzle actuator is of great significance to the layout of hydraulic pipelines, the utilization of space and the weight reduction of the aircraft. Summary of the invention

[0003] In order to solve the above problems, the present application provides a single nozzle type landing gear emergency release actuator, comprising:

[0004] Nozzle, piston, return spring, piston rod, outer cylinder;

[0005] A piston is connected to one end of the piston rod, the outer tube mouth is sleeved on the piston rod, and the piston is sleeved in the outer tube, dividing the outer tube into a rod chamber and a rodless chamber. A return spring is installed in the rod chamber to provide a preload force for the piston to move toward the rodless chamber. A nozzle is used to supply hydraulic oil to the actuator or discharge hydraulic oil.

[0006] Preferably, the nozzle is in communication with the rodless cavity.

[0007] Preferably, the nozzle is connected to the rodless chamber, and the piston is provided with an oil hole connecting the rodless chamber and the rod chamber.

[0008] Preferably, the nozzle is connected to the rod chamber, and the piston has an oil hole connecting the rodless chamber and the rod chamber.

[0009] Preferably, the diameter of the piston rod is larger than the set value d.

[0010] Preferably, the setting value d satisfies:

[0011] 0.25pπ(D^2-d^2)≥F+f+f1;

[0012] Where D is the diameter of the piston (5), p is the hydraulic oil pressure, F is the rated load, f is the friction force, and f1 is the maximum resistance of the spring.

[0013] Preferably, a single nozzle type landing gear emergency release actuator is used to unlock the landing gear strut lock.

[0014] Preferably, the oil through holes include a plurality of holes arranged along the circumference of the piston.

[0015] Preferably, the piston has a cylindrical groove on one end surface of the rodless chamber, and the oil through hole is located at the bottom of the cylindrical groove.

[0016] Preferably, the area of ​​the cylindrical recess is adapted to the actuation power of the piston rod.

[0017] Preferably, the diameter of the oil through hole in the rodless cavity is smaller than the diameter of the oil through hole in the rod cavity.

[0018] The advantages of the present application include: the present invention is a single-nozzle landing gear emergency release actuator, the actuator adopts a single nozzle, and the cavity is added with a return spring. The function is not reduced compared to when the actuator adopts a double nozzle, but the single nozzle form can reduce the layout of one pipeline, reduce the space used when arranging the pipeline, reduce the weight of the arranged pipeline, and reduce the overall cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main emergency release actuator of a preferred embodiment of the present application;

[0020] Figure 2 It is a schematic diagram of a piston oil hole in a preferred embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be further described in detail in detail and in detail in conjunction with the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0022] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installed", "connected", "connected" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0023] like Figure 1-Figure 2 As shown, in order to solve the above problems, the present application provides a single nozzle type landing gear emergency release actuator, comprising:

[0024] Nozzle 3, piston 5, return spring 4, piston rod 2, outer tube 1;

[0025] A piston 5 is connected to one end of a piston rod 2, an outer tube 1 is sleeved on the piston rod 2, and the piston 5 is sleeved in the outer tube 1, dividing the outer tube 1 into a rod chamber and a rodless chamber. A return spring 4 is installed in the rod chamber to provide a preload force for the piston 5 to move toward the rodless chamber. A nozzle 3 is used to supply hydraulic oil to or discharge hydraulic oil from the actuator.

[0026] Preferably, the nozzle 3 is communicated with the rodless cavity.

[0027] Preferably, the nozzle 3 is communicated with the rodless chamber, and the piston 5 has an oil hole communicating the rodless chamber with the rod chamber.

[0028] Preferably, the nozzle 3 is connected to the rod chamber, and the piston 5 has an oil hole connecting the rodless chamber and the rod chamber.

[0029] Preferably, the diameter of the piston rod 2 is larger than the set value d.

[0030] Preferably, the setting value d satisfies:

[0031] 0.25pπ(D^2-d^2)≥F+f+f1;

[0032] Where D is the piston diameter, p is the hydraulic oil pressure, F is the rated load, f is the friction force, and f1 is the maximum resistance of the spring.

[0033] Preferably, a single nozzle type landing gear emergency release actuator is used to unlock the landing gear strut lock.

[0034] Preferably, the oil through holes include a plurality of holes arranged along the circumference of the piston 5 .

[0035] Preferably, the piston 5 has a cylindrical groove on one end surface of the rodless chamber, and the oil through hole is located at the bottom of the cylindrical groove.

[0036] Preferably, the area of ​​the cylindrical recess is adapted to the actuation power of the piston rod 2 .

[0037] Preferably, the diameter of the oil through hole in the rodless cavity is smaller than the diameter of the oil through hole in the rod cavity. DETAILED DESCRIPTION

[0039] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0040] See also Figure 1 The present invention is a single nozzle type landing gear emergency release actuator, the nozzle 3 is connected to the rod chamber, and the piston 5 has an oil hole connecting the rodless chamber and the rod chamber. Take this as an example:

[0041] The main parts of the landing gear retracting and extending actuator cylinder include an outer cylinder 1, a piston rod 2, a nozzle 3, a return spring 4, a piston 5, etc. The following describes the emergency release actuator cylinder through the retraction process of the emergency release actuator cylinder and the extension process of the actuator cylinder.

[0042] a) Emergency release actuator extension process:

[0043] (1) Emergency hydraulic system pressure supply;

[0044] (2) The oil flows into the rod cavity of the outer tube 1 through the nozzle 3;

[0045] (3) The oil flows into the rodless chamber of the outer cylinder through the oil hole on the piston 5;

[0046] (4) Due to the difference in the area of ​​the pistons on both sides, the piston rod 2 compresses the return spring 4 and extends;

[0047] (5) After the piston rod 3 is extended, the landing gear strut lock is unlocked.

[0048] b) Actuator retraction process:

[0049] (1) Emergency hydraulic system pressure relief;

[0050] (2) The return spring 4 overcomes the pressure difference between the two chambers and the friction force to extend;

[0051] (3) The return spring 4 extends to push the piston rod 2 and the piston 5 to move;

[0052] (4) The piston rod 2 and piston 5 are retracted and the actuator is reset;

[0053] The advantages of the present application include: the present invention is a single-nozzle landing gear emergency release actuator, the actuator adopts a single nozzle, and the cavity is added with a return spring. The function is not reduced compared to when the actuator adopts a double nozzle, but the single nozzle form can reduce the layout of one pipeline, reduce the space used when arranging the pipeline, reduce the weight of the arranged pipeline, and reduce the overall cost.

[0054] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A single nozzle landing gear emergency release actuator, characterized in that: include: Nozzle (3), piston (5), return spring (4), piston rod (2), outer tube (1); A piston (5) is connected to one end of a piston rod (2), an outer tube (1) is sleeved on the piston rod (2), and the piston (5) is sleeved in the outer tube (1), dividing the outer tube (1) into a rod chamber and a rodless chamber. A return spring (4) is installed in the rod chamber to provide a preload force for the piston (5) to move toward the rodless chamber. A nozzle (3) is used to supply hydraulic oil to the actuator cylinder or discharge hydraulic oil.

2. The single nozzle type landing gear emergency release actuator as claimed in claim 1, characterized in that: The nozzle (3) is communicated with the rodless cavity.

3. The single nozzle landing gear emergency release actuator as claimed in claim 1, characterized in that: The nozzle (3) is connected to the rodless chamber, and the piston (5) is provided with an oil hole connecting the rodless chamber and the rod chamber.

4. The single nozzle type landing gear emergency release actuator as claimed in claim 1, characterized in that: The nozzle (3) is connected to the rod chamber, and the piston (5) is provided with an oil hole connecting the rodless chamber and the rod chamber.

5. The single nozzle type landing gear emergency release actuator as claimed in claim 4, characterized in that: The diameter of the piston rod (2) is greater than a set value d.

6. The single nozzle type landing gear emergency release actuator as claimed in claim 5, characterized in that: The setting value d satisfies: 0.25pπ(D^2-d^2)≥F+f+f1; Where D is the diameter of the piston (5), p is the hydraulic oil pressure, F is the rated load, f is the friction force, and f1 is the maximum resistance of the spring.

7. The single nozzle type landing gear emergency release actuator as claimed in claim 4, characterized in that: The single nozzle landing gear emergency release actuator is used to unlock the landing gear strut lock.

8. The single nozzle landing gear emergency release actuator as claimed in claim 4, characterized in that: The oil through holes include a plurality of holes arranged along the circumference of the piston (5).

9. The single nozzle type landing gear emergency release actuator as claimed in claim 4, characterized in that: The piston (5) has a cylindrical groove on one end surface of the rodless cavity, and the oil through hole is located at the bottom of the cylindrical groove.

10. The single nozzle type landing gear emergency release actuator as claimed in claim 9, characterized in that: The area of ​​the cylindrical recess is adapted to the actuation power of the piston rod (2).

11. The single nozzle type landing gear emergency release actuator as claimed in claim 9, characterized in that: The diameter of the oil through hole in the rodless cavity is smaller than that in the rod cavity.

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