Oil path control device for retraction and release of undercarriage

Abstract

The utility model relates to the technical field of undercarriages, and discloses an oil path control device for folding and unfolding of an undercarriage, which comprises a one-way valve body, the one-way valve body comprises a valve body, valve covers are mounted at two ends of the valve body, an oil inlet hole and an oil return hole are axially formed in the valve body in a penetrating manner, a first valve core mounting hole is formed in the oil inlet hole, and a second valve core mounting hole is formed in the oil return hole. A second valve element installation hole is formed in the oil return hole, and the first valve element installation hole and the second valve element installation hole are distributed in the ends of the different sides of the valve body respectively. By arranging the one-way valve body which can be conducted only through certain oil pressure, the oil supply and return system can synchronously convey hydraulic oil to the driving cylinder and the follow-up cylinder in a homologous mode, independent oil supply to the driving cylinder and the follow-up cylinder is not needed, the design difficulty of the hydraulic system is lowered, and meanwhile the fault rate of the hydraulic system is lowered; the arranged one-way valve body is simple in overall structure, high in reliability, low in follow-up maintenance frequency and convenient to maintain.

Description

Technical Field

[0001] This utility model relates to the field of landing gear technology, specifically, to a hydraulic control device for landing gear retraction and extension. Background Technology

[0002] Aircraft landing gear retraction and extension are primarily controlled by the extension and retraction of hydraulic actuators. However, aircraft landing gear design often involves significant weight and space constraints. In the limited space of an aircraft, a single large-diameter actuator is insufficient to meet the space requirements for landing gear retraction and extension. Therefore, a combination of a primary actuator and a secondary actuator of smaller diameter is needed to achieve synchronized extension and retraction. Since the unlocking pressures of existing actuators with locking mechanisms are not significantly different, as shown in the attached... Figure 1 In the process of supplying and returning hydraulic oil to the active cylinder 1 and the follower cylinder 2 from the same source, the unlocking sequence of the locking mechanism in the active cylinder 1 and the follower cylinder 2 is uncertain. In order to control the unlocking sequence of the active cylinder 1 and the follower cylinder 2, the supply and return hydraulic oil system 3 needs to supply hydraulic oil to the active cylinder 1 and the follower cylinder 2 separately. This will not only increase the design difficulty of the aircraft hydraulic system, but also increase the failure rate of hydraulic control and reduce the safety of the aircraft landing gear retraction and extension. Therefore, it is necessary to add an oil circuit control device to the oil supply line to control the unlocking sequence of the active cylinder 1 and the follower cylinder 2 and reduce the design difficulty of the hydraulic system. Utility Model Content

[0003] The purpose of this utility model is to provide a hydraulic circuit control device for landing gear retraction and extension, which solves the problems of high design difficulty and high failure rate of hydraulic systems in the prior art due to the need to supply oil to different actuators separately.

[0004] This utility model is achieved through the following technical solution: a landing gear retraction and extension hydraulic circuit control device, comprising a one-way valve body, wherein the one-way valve body includes a valve body, valve covers are installed at both ends of the valve body, an oil inlet hole and an oil return hole are axially through the valve body, a first valve core mounting hole is provided on the oil inlet hole, the first valve core mounting hole is flush with one end of the valve body, a second valve core mounting hole is provided on the oil return hole, the second valve core mounting hole is flush with one end of the valve body, the first valve core mounting hole and the second valve core mounting hole are respectively distributed on different ends of the valve body; the first valve core mounting hole and the second valve core mounting hole are respectively distributed on different ends of the valve body; Each hole is fitted with a screw plug, which is slidably connected to the valve stem. A first valve core is also slidably connected to the first valve core mounting hole, and the first valve core is mounted on the valve stem in the first valve core mounting hole. A first valve assembly spring is provided between the first valve core and the screw plug in the first valve core mounting hole. A second valve core is slidably connected to the second valve core mounting hole, and the second valve core is mounted on the valve stem in the second valve core mounting hole. The diameter of the first valve core mounting hole is larger than the diameter of the oil inlet hole. The diameter of the second valve core mounting hole is larger than the diameter of the oil return hole. The first valve core is used to block the oil inlet hole, and the second valve core is used to block the oil return hole.

[0005] To better realize this utility model, a second valve group spring is further provided between the second valve core and the screw plug on the second valve core mounting hole.

[0006] To better realize this utility model, the first valve core is further provided with an outer conical surface at the end near the oil inlet, and the oil inlet is provided with an inner conical surface at the end near the first valve core; the second valve core is provided with an outer conical surface at the end near the oil return hole, and the oil return hole is provided with an inner conical surface at the end near the second valve core.

[0007] To better realize this utility model, the valve cover is further connected to the valve body by a thread.

[0008] To better realize this utility model, a valve assembly seal is further provided between the valve body and the valve cover.

[0009] To better realize this utility model, the valve body is further provided with a mounting base, and the mounting base is provided with a threaded through hole and a groove.

[0010] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0011] (1) By setting a one-way valve body that requires a certain oil pressure to conduct, this utility model enables the oil supply and return system to synchronously deliver hydraulic oil to the active cylinder and the follower cylinder from the same source, without the need to supply oil to the active cylinder and the actuator cylinder separately, which reduces the design difficulty of the hydraulic system and reduces the failure rate of the hydraulic system.

[0012] (2) The one-way valve body of this utility model has a simple overall structure, high reliability, low subsequent maintenance frequency, and convenient maintenance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a dual-actuator landing gear structure.

[0014] Figure 2 This is a cross-sectional view of the one-way valve body structure.

[0015] Figure 3 This is a partial structural cross-sectional view of the one-way valve body.

[0016] Wherein: 1-Active cylinder; 2-Follower cylinder; 3-Oil supply and return system; 4-One-way valve body; 401-Valve body; 4011-Oil inlet; 4012-First valve core mounting hole; 4013-Second valve core mounting hole; 4014-Oil return hole; 402-Valve cover; 403-Plug; 404-Valve stem; 405-First valve group spring; 406-First valve core; 407-Second valve core; 408-Second valve group spring; 409-Valve group seal; 410-Mounting seat. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] Example 1:

[0020] This embodiment provides a hydraulic control device for landing gear retraction and extension, specifically as follows: Figure 2 , Figure 3As shown, the device includes a one-way valve body 4, which comprises a valve body 401. Valve covers 402 are mounted on both ends of the valve body 401. An oil inlet hole 4011 and an oil return hole 4014 are axially perforated on the valve body 401. A first valve core mounting hole 4012 is provided on the oil inlet hole 4011, flush with one end of the valve body 401. A second valve core mounting hole 4013 is provided on the oil return hole 4014, also flush with one end of the valve body 401. The first valve core mounting holes 4012 and 4013 are located on different sides of the valve body 401. A screw plug 403 is installed on both the first and second valve core mounting holes 4012 and 4013, and the screw plug 403 is slidably connected to... A first valve core 406 is slidably connected to the first valve core mounting hole 4012 on the valve stem 404. The first valve core 406 is mounted on the valve stem 404 on the first valve core mounting hole 4012. A first valve group spring 405 is provided between the first valve core 406 and the screw plug 403 on the first valve core mounting hole 4012. A second valve core 407 is slidably connected to the second valve core mounting hole 4013. The second valve core 407 is mounted on the valve stem 404 on the second valve core mounting hole 4013. The diameter of the first valve core mounting hole 4012 is larger than the diameter of the oil inlet hole 4011. The diameter of the second valve core mounting hole 4013 is larger than the diameter of the oil return hole 4014. The first valve core 406 is used to block the oil inlet hole 4011, and the second valve core 407 is used to block the oil return hole 4014.

[0021] When the oil supply and return system 3 pumps hydraulic oil to the one-way valve body 4, the hydraulic oil enters the valve body 401 from the valve cover 402 near the second valve core 407. At this time, the hydraulic oil splits into two parts. One part enters the second valve core mounting hole 4013, and the hydraulic oil synchronously pushes the second valve core 407 to move. The other part of the hydraulic oil flows through the return hole 4014, eventually causing the second valve core 407 to press against the end of the return hole 4014 and block it. At this point, no hydraulic oil passes through the return hole 4014. On the other hand, the other part of the hydraulic oil enters the inlet hole 4011. Due to the action of the first valve group spring 405, the first valve core 406 firmly blocks the inlet hole 4011. 11. Therefore, no hydraulic oil flows into the first valve core mounting hole 4012. As the pressure of the hydraulic oil entering the valve body 401 increases, the force of the second valve core 407 blocking the second valve core mounting hole 4013 increases. At the same time, the hydraulic oil in the oil inlet hole 4011 begins to push the first valve core 406, causing the first valve group spring 405 to be compressed. The first valve core 406 drives the valve stem 404 to slide on the screw plug 403. Since the first valve core 406 is disengaged from the oil inlet hole 4011, the hydraulic oil in the oil inlet hole 4011 begins to enter the first valve core mounting hole 4012, and then is discharged into the active cylinder 1 through the valve cover 402 near the first valve core 406.

[0022] When the hydraulic oil in the active cylinder 1 flows back to the oil supply and return system 3, the hydraulic oil flows into the valve body 401 from the valve cover 402 near the first valve core 406. At this time, the hydraulic oil is also divided into two parts. One part enters the first valve core mounting hole 4012, making the first valve core 406 more firmly pressed on the oil inlet hole 4011, that is, hydraulic oil is not allowed to flow in the oil inlet hole 4011. The other part of the hydraulic oil flows into the oil return hole 4014, and then pushes the second valve core 407 away from the oil return hole 4014, thereby entering the second valve core mounting hole 4013, and finally flows smoothly back to the oil supply and return system 3 from the valve cover 402 near the second valve core 407.

[0023] The above settings ensure that the hydraulic oil needs to have a certain oil pressure to pass through the check valve body 4, thereby ensuring that the unlocking sequence of the active cylinder 1 and the follower cylinder 2 is fixed and improving the stability of the entire system. The check valve body 4 has a simple overall structure, high reliability, low subsequent maintenance frequency, and is easy to maintain.

[0024] Example 2:

[0025] This embodiment further extends the above embodiment, specifically as follows: Figure 2 As shown, a second valve assembly spring 408 is provided between the second valve core 407 and the screw plug 403 on the second valve core mounting hole 4013.

[0026] By setting the second valve group spring 408, the second valve core 407 can block the return oil hole 4014 under the action of the second valve group spring 408 in the initial state. That is, when hydraulic oil flows into the active cylinder 1 in the oil supply and return system 3, there is no need for hydraulic oil to push the second valve core 407 to press on the return oil hole 4014. At this time, no small amount of hydraulic oil will flow from the second valve core mounting hole 4013 through the return oil hole 4014. Since the elasticity of the second valve group spring 408 is weak, when the hydraulic oil in the active cylinder 1 flows back to the oil supply and return system 3, the returning hydraulic oil can easily push the second valve core 407, thereby improving the stability of the system operation.

[0027] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0028] Example 3:

[0029] This embodiment further extends the above embodiment, specifically as follows: Figure 2 As shown, the first valve core 406 has an outer conical surface at one end near the oil inlet hole 4011, and the oil inlet hole 4011 has an inner conical surface at one end near the first valve core 406; the second valve core 407 has an outer conical surface at one end near the oil return hole 4014, and the oil return hole 4014 has an inner conical surface at one end near the second valve core 407.

[0030] When sealing is achieved by the inner and outer conical surfaces working together, the sealing performance is better because the contact area of ​​the conical surfaces is larger.

[0031] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0032] Example 4:

[0033] This embodiment further extends the above embodiment, specifically as follows: Figure 2 As shown, the valve cover 402 is threadedly connected to the valve body 401. The stability and quick-release properties of the threaded connection improve the ease of maintenance for the one-way valve body 4.

[0034] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0035] Example 5:

[0036] This embodiment further extends the above embodiment, specifically as follows: Figure 2 As shown, a valve assembly seal 409 is provided between the valve body 401 and the valve cover 402. The valve assembly seal 409 improves the sealing performance between the valve body 401 and the valve cover 402, prevents hydraulic oil leakage during operation, and improves overall reliability.

[0037] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0038] Example 6:

[0039] This embodiment further extends the above embodiment, specifically as follows: Figure 2 As shown, a mounting base 410 is installed on the valve body 401, and the mounting base 410 is provided with a threaded through hole and a groove.

[0040] The threaded through hole on the mounting base 410 facilitates the installation of the one-way valve body 4 onto the drive cylinder 1 using bolts, preventing the one-way valve body 4 from shaking and impacting other components during operation; while the slot provided allows the operator to adapt to changing the bolt position to accommodate more specifications of drive cylinder 1 for installation.

[0041] The other parts of this embodiment are the same as those in the above embodiments, and will not be described again.

[0042] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A hydraulic control device for landing gear retraction and extension, characterized in that: The system includes a one-way valve body (4), which includes a valve body (401). Valve covers (402) are installed at both ends of the valve body (401). An oil inlet (4011) and an oil return (4014) are axially perforated on the valve body (401). A first valve core mounting hole (4012) is provided on the oil inlet (4011), flush with one end of the valve body (401). The oil return hole (4014)... 14) A second valve core mounting hole (4013) is provided on the valve body (401), the second valve core mounting hole (4013) is flush with one end of the valve body (401), the first valve core mounting hole (4012) and the second valve core mounting hole (4013) are respectively distributed on different sides of the valve body (401); a screw plug (403) is installed on both the first valve core mounting hole (4012) and the second valve core mounting hole (4013), and the screw plug (403) is slidably connected to the valve body (401). A valve stem (404); a first valve core (406) is slidably connected to the first valve core mounting hole (4012), the first valve core (406) is mounted on the valve stem (404) in the first valve core mounting hole (4012), and a first valve group spring (405) is provided between the first valve core (406) and the screw plug (403) in the first valve core mounting hole (4012); a second valve core (407) is slidably connected to the second valve core mounting hole (4013). The second valve core (407) is mounted on the valve stem (404) in the second valve core mounting hole (4013); the diameter of the first valve core mounting hole (4012) is larger than the diameter of the oil inlet hole (4011); the diameter of the second valve core mounting hole (4013) is larger than the diameter of the oil return hole (4014); the first valve core (406) is used to block the oil inlet hole (4011), and the second valve core (407) is used to block the oil return hole (4014).

2. The hydraulic control device for landing gear retraction and extension according to claim 1, characterized in that: A second valve assembly spring (408) is provided between the second valve core (407) and the screw plug (403) on the second valve core mounting hole (4013).

3. The hydraulic control device for landing gear retraction and extension according to claim 1, characterized in that: The first valve core (406) has an outer conical surface at one end near the oil inlet (4011), and the oil inlet (4011) has an inner conical surface at one end near the first valve core (406); the second valve core (407) has an outer conical surface at one end near the oil return (4014), and the oil return (4014) has an inner conical surface at one end near the second valve core (407).

4. The hydraulic control device for landing gear retraction and extension according to claim 1, characterized in that: The valve cover (402) is threaded onto the valve body (401).

5. The hydraulic control device for landing gear retraction and extension according to claim 1, characterized in that: A valve assembly seal (409) is provided between the valve body (401) and the valve cover (402).

6. The hydraulic control device for landing gear retraction and extension according to claim 1, characterized in that: The valve body (401) is equipped with a mounting base (410), which has a threaded through hole and a groove.

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