Actuator cylinder for an aircraft landing gear

Abstract

The utility model relates to the technical field of aircraft landing gear provides a kind of operating cylinder of aircraft landing gear, including cylinder, the one end of cylinder is equipped with transmission shaft, the one end of transmission shaft is equipped with connecting cylinder, the one end of connecting cylinder is fixed with first connecting piece, the one end of cylinder is fixed with second connecting piece, the inside of connecting cylinder is equipped with connecting structure, the inside of cylinder is equipped with transmission structure.The utility model is provided with connecting structure, when transmission shaft and connecting cylinder butt joint or stress, first spring can be elastically stretched along the direction of guide column, absorbs impact load, first stopper and second stopper first pass through the movement range of transmission shaft by sliding slot limitation, avoid excessive insertion or out of;Subsequently, the thread cooperation of threaded rod and threaded hole, combine second spring and push limit block and embed between stopper, improve the security and stability of landing gear retraction process.

Description

Technical Field

[0001] This utility model relates to the field of aircraft landing gear technology, and in particular to an actuating cylinder for aircraft landing gear. Background Technology

[0002] In the aircraft landing gear system, the actuator cylinder, as the core execution component, undertakes the key functions of driving the landing gear retraction and extension and adjusting the landing buffer attitude. Its performance directly determines the reliability, safety and service life of the landing gear, and plays an irreplaceable role in the stability of the aircraft during takeoff and landing.

[0003] To this end, patent CN223224526U discloses a fully electric retraction actuator for aircraft landing gear, belonging to the field of actuator technology. It includes an actuator body and a drive shaft, wherein the drive shaft is sealed and slidably mounted on the outside of the actuator body. The connector has slots at both ends, through which top plates are slidably mounted, and the two top plates are "T"-shaped. Limiting blocks are attached to the tops of the two top plates. This fully electric retraction actuator for aircraft landing gear features top plates. The slots at both ends of the connector allow for the sliding mounting of the top plates via return springs. Limiting blocks are attached to the tops of the two top plates. After the drive shaft and connector are disassembled, the two return springs release their force and rebound, causing the two top plates to push the drive shaft connected to the inner ends of the two limiting blocks, automatically ejecting it to the outside of the connector. This allows for assisted disassembly and replacement of the connector.

[0004] The all-electric retraction actuator described above for aircraft landing gear relies solely on the spring force of the return spring to drive the top plate and the limit block to contact the drive shaft. Under conditions such as high-frequency vibration during aircraft takeoff and landing and ground impact, the spring force is prone to fatigue decay or vibration displacement, causing the limit block to loosen, which in turn causes relative movement between the drive shaft and the connecting parts. This cannot guarantee the long-term stability of the connection parts and poses a safety hazard of actuator transmission failure. Utility Model Content

[0005] The purpose of this invention is to provide an actuator for aircraft landing gear, which solves the problem of insufficient stability of existing all-electric retraction actuators for aircraft landing gear.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an actuating cylinder for an aircraft landing gear, comprising a cylinder body;

[0007] A drive shaft is installed at one end of the cylinder, a connecting cylinder is installed at one end of the drive shaft, a first connecting member is fixed at one end of the connecting cylinder, a second connecting member is fixed at one end of the cylinder, a connecting structure is installed inside the connecting cylinder, the connecting structure includes an internal cavity disposed inside the connecting cylinder, a guide post is fixed at one end inside the internal cavity, a first spring is installed on the outside of the guide post, a connecting plate is fixed at one end of the first spring, sliding grooves are provided on both sides inside the connecting cylinder, sliders are fixed on both sides of the connecting plate inside the sliding grooves, a first stop is fixed on both sides of the drive shaft inside the sliding grooves, a second stop is fixed on both sides of the drive shaft on one side of the first stop, threaded holes are provided on both sides of the connecting cylinder, and threaded rods are installed inside the threaded holes;

[0008] The cylinder is equipped with a transmission structure inside.

[0009] Preferably, both sides of the internal sliding groove of the connecting cylinder are provided with built-in grooves, a limit block is installed at one end of the threaded rod between the first stop and the second stop, a second spring is installed on the outside of the threaded rod on one side of the limit block, a rotating block is fixed at one end of the threaded rod, and a rotating groove is provided inside the limit block on the outside of the rotating block.

[0010] Preferably, the other end of the first spring is fixedly connected to one end inside the connecting cylinder, the connecting plate and the connecting cylinder form a telescopic structure through the first spring, the sliding grooves are symmetrically distributed on both sides inside the connecting cylinder, and the slider and the connecting cylinder form a sliding connection through the sliding grooves.

[0011] With the above structure, when the connecting plate is driven by the first spring or pushed by the transmission shaft during use, the slider will slide synchronously along the track of the slide groove, strictly limiting the movement direction of the connecting plate and avoiding radial offset, tilting or jamming.

[0012] Preferably, the first stop and the second stop are slidably connected to the connecting cylinder through a sliding groove. The first stop and the second stop are symmetrically distributed on both sides of the drive shaft. The threaded holes are symmetrically distributed on both sides of the connecting cylinder. The threaded rod is threadedly connected to the threaded holes.

[0013] With the above structure, during use, rotating the threaded rods on both sides allows the threaded rods to extend axially into the connecting cylinder along the threaded hole until they contact the stop block, thereby locking the relative position of the drive shaft and the connecting cylinder. The characteristics of the threaded connection allow the locking force to be precisely controlled by the number of rotations, ensuring a secure lock while preventing damage to components due to overtightening.

[0014] Preferably, the limiting block is fitted into the built-in groove, the bottom end of the second spring abuts against the top end of the limiting block, the rotating block and the limiting block are rotatably connected through the rotating groove, the two sides of the limiting block abut against one side of the first stop and the second stop respectively, and the transmission shaft and the limiting block are engaged through the first stop and the second stop.

[0015] With the above structure, when the threaded rod is rotated to push the limiting block to move during use, the rotating block can rotate synchronously in the rotating groove, while the limiting block only moves in a straight line along the built-in groove and will not deflect with the rotation of the threaded rod. The limiting block abuts against the sides of the first and second stops, and cooperates with the fixed connection between the two stops and the drive shaft, so that the drive shaft and the limiting block form a locking structure, preventing the drive shaft from axially moving or radially deviating in the connecting cylinder.

[0016] Preferably, the transmission structure includes a DC motor installed at one end inside the cylinder, guide grooves are provided on both sides inside the cylinder, a movable plate is installed inside the cylinder, guide blocks are fixed on both sides of the movable plate inside the guide groove, a lead screw is fixed at the output end of the DC motor, a fixed cylinder is fixed at one end of the movable plate outside the lead screw, and a threaded groove is provided on the outside of the lead screw inside the fixed cylinder.

[0017] Preferably, the guide grooves are symmetrically distributed on both sides of the cylinder body, the guide block and the cylinder body are slidably connected through the guide grooves, and the lead screw and the fixed cylinder are threadedly connected through the threaded grooves.

[0018] With the above structure, when the drive cylinder starts the transmission function, the moving plate will be displaced by the transmission action of the lead screw and the fixed cylinder. At this time, the guide blocks on both sides of the moving plate will slide synchronously along the symmetrically distributed guide grooves, forcibly restricting the moving plate to only move in a straight line along the axial direction of the guide groove, so as to avoid it from deflection, tilting or jamming due to the radial force generated by the rotation of the lead screw.

[0019] The actuating cylinder for aircraft landing gear provided by this utility model has the following advantages:

[0020] With the connection structure in place, when the drive shaft is connected to the connecting cylinder or subjected to force, the first spring can elastically extend and retract along the direction of the guide post to absorb the impact load. The first and second stops first limit the movement range of the drive shaft through the sliding groove to avoid excessive insertion or disengagement. Then, the threaded engagement of the threaded rod and the threaded hole, combined with the second spring, pushes the limit block to embed between the stops, improving the safety and stability of the landing gear retraction and extension process.

[0021] With a transmission structure, a DC motor drives the lead screw to rotate. The lead screw and the fixed cylinder are precisely matched with the threaded groove, which converts the rotational motion into the linear motion of the fixed cylinder. At the same time, the sliding constraint between the guide groove and the guide block further prevents the moving plate from deviating, ensuring that the extension and retraction stroke of the actuator cylinder is precise and controllable. Attached Figure Description

[0022] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0023] Figure 2 This is a three-dimensional cross-sectional schematic diagram of the present invention;

[0024] Figure 3 For the present utility model Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 This is a three-dimensional exploded view of the connection structure of this utility model;

[0026] Figure 5 This is a three-dimensional exploded view of the transmission structure of this utility model.

[0027] The reference numerals in the figure are as follows: 1. Cylinder; 2. Drive shaft; 3. Connecting cylinder; 4. First connecting piece; 5. Second connecting piece; 6. Connecting structure; 601. Internal cavity; 602. Guide post; 603. First spring; 604. Connecting plate; 605. Slide groove; 606. Slider; 607. First stop block; 608. Second stop block; 609. Threaded hole; 610. Threaded rod; 611. Internal groove; 612. Limiting block; 613. Second spring; 614. Rotating block; 615. Rotating groove; 7. Transmission structure; 701. DC motor; 702. Guide groove; 703. Moving plate; 704. Guide block; 705. Lead screw; 706. Fixed cylinder; 707. Threaded groove. Detailed Implementation

[0028] 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.

[0029] Please see Figures 1-5 The present invention provides an actuation cylinder for aircraft landing gear, comprising a cylinder body 1.

[0030] Reference Figures 1-5As shown, a drive shaft 2 is installed at one end of the cylinder 1, a connecting cylinder 3 is installed at one end of the drive shaft 2, a first connecting member 4 is fixed at one end of the connecting cylinder 3, a second connecting member 5 is fixed at one end of the cylinder 1, a connecting structure 6 is installed inside the connecting cylinder 3, the connecting structure 6 includes an internal cavity 601 disposed inside the connecting cylinder 3, a guide post 602 is fixed at one end inside the internal cavity 601, a first spring 603 is installed on the outside of the guide post 602, a connecting plate 604 is fixed at one end of the first spring 603, and sliding grooves 605 are provided on both sides inside the connecting cylinder 3, and the sliding grooves 605 connect... Slider blocks 606 are fixed on both sides of plate 604. First stops 607 are fixed on both sides of drive shaft 2 inside slide groove 605. Second stops 608 are fixed on both sides of drive shaft 2 on one side of first stops 607. Threaded holes 609 are provided on both sides of connecting cylinder 3. Threaded rods 610 are installed inside threaded holes 609. Internal grooves 611 are provided on both sides of slide groove 605 inside connecting cylinder 3. A limit block 612 is installed at one end of threaded rod 610 between first stops 607 and second stops 608. A second spring 61 is installed on the outside of threaded rod 610 on one side of limit block 612. 3. One end of the threaded rod 610 is fixed with a rotating block 614. The inner part of the outer limiting block 612 of the rotating block 614 is provided with a rotating groove 615. The other end of the first spring 603 is fixedly connected to one end inside the connecting cylinder 3. The connecting plate 604 and the connecting cylinder 3 form a telescopic structure through the first spring 603. The sliding grooves 605 are symmetrically distributed on both sides inside the connecting cylinder 3. The slider 606 and the connecting cylinder 3 are slidably connected through the sliding grooves 605. The first stop block 607 and the second stop block 608 are slidably connected to the connecting cylinder 3 through the sliding grooves 605, respectively. 608 are symmetrically distributed on both sides of the drive shaft 2, threaded holes 609 are symmetrically distributed on both sides of the connecting cylinder 3, threaded rod 610 is threadedly connected to threaded hole 609, limiting block 612 is fitted into inner groove 611, bottom end of second spring 613 abuts against top end of limiting block 612, rotating block 614 and limiting block 612 are rotatably connected through rotating groove 615, both sides of limiting block 612 abut against one side of first stop 607 and second stop 608 respectively, and drive shaft 2 and limiting block 612 are engaged through first stop 607 and second stop 608.

[0031] The guide post 602 fixed in the built-in cavity 601 provides a mounting and guiding foundation for the first spring 603. One end of the drive shaft 2 is inserted into the interior of the connecting cylinder 3, so that the first stop 607 and the second stop 608 slide along the slide groove 605. During the insertion of the drive shaft 2, the connecting plate 604 is subjected to force, and the slider 606 slides synchronously with the connecting plate 604 along the slide groove 605 to ensure the stability of the connecting plate 604 during movement. This causes the first spring 603 to be compressed or extended along the direction of the guide post 602, achieving buffering and reset. The first stop 607 and the second stop 608 are fixed on both sides of the drive shaft 2 and can slide along the slide groove 605 to limit the range of movement of the drive shaft 2 in the connecting cylinder 3. After the drive shaft 2 is adjusted to a suitable position, the threaded rod 610 is rotated so that one end of it extends into the interior of the connecting cylinder 3. The second spring 613 installed on the outside of the threaded rod 610 will generate a resisting force on the limiting block 612, pushing the limiting block 612 into the space between the first stop 607 and the second stop 608. The position of the drive shaft 2 and the connecting cylinder 3 is locked through multiple limiting actions. In addition, the rotating block 614 at one end of the threaded rod 610 can rotate within the rotating groove 615 of the limiting block 612, ensuring that the rotation of the threaded rod 610 does not drive the limiting block 612 to rotate synchronously. The limiting action is completed only by the elastic force of the second spring 613 pushing the limiting block 612.

[0032] Reference Figure 2 and Figure 5 As shown, a transmission structure 7 is installed inside the cylinder 1. The transmission structure 7 includes a DC motor 701 installed at one end inside the cylinder 1. Guide grooves 702 are provided on both sides inside the cylinder 1. A moving plate 703 is installed inside the cylinder 1. Guide blocks 704 are fixed on both sides of the moving plate 703 inside the guide grooves 702. A lead screw 705 is fixed at the output end of the DC motor 701. A fixed cylinder 706 is fixed at one end of the moving plate 703 outside the lead screw 705. A threaded groove 707 is provided on the outside of the lead screw 705 inside the fixed cylinder 706. The guide grooves 702 are symmetrically distributed on both sides inside the cylinder 1. The guide blocks 704 and the cylinder 1 are slidably connected through the guide grooves 702. The lead screw 705 and the fixed cylinder 706 are threadedly connected through the threaded grooves 707.

[0033] A DC motor 701 installed at one end inside the cylinder 1 provides power to the transmission structure. When the DC motor 701 starts, its output drives the lead screw 705 to rotate, converting the rotational motion of the motor into subsequent linear motion. The guide grooves 702 on both sides inside the cylinder 1 and the guide blocks 704 on both sides of the moving plate 703 form a sliding fit, restricting the movement direction of the moving plate 703 and ensuring that the moving plate 703 can only move linearly along the guide grooves 702, avoiding deviation or jamming during movement. The fixed cylinder 706 fixed at one end of the moving plate 703 has a threaded groove 707 inside, forming a threaded connection with the lead screw 705. When the lead screw 705 rotates under the drive of the DC motor 701, through the threaded fit, the rotational motion of the lead screw 705 is converted into the linear motion of the fixed cylinder 706, which in turn drives the moving plate 703 to move along the guide grooves 702. This movement drives relative motion between the cylinder 1, the transmission shaft 2, and the connecting cylinder 3, ultimately realizing the extension and retraction of the actuating cylinder, providing driving force for the retraction and extension of the aircraft landing gear.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An actuation cylinder for an aircraft landing gear, comprising a cylinder body (1); Its features are: A drive shaft (2) is installed at one end of the cylinder (1), a connecting cylinder (3) is installed at one end of the drive shaft (2), a first connecting member (4) is fixed at one end of the connecting cylinder (3), a second connecting member (5) is fixed at one end of the cylinder (1), a connecting structure (6) is installed inside the connecting cylinder (3), the connecting structure (6) includes an internal cavity (601) disposed inside the connecting cylinder (3), a guide post (602) is fixed at one end inside the internal cavity (601), a first spring (603) is installed on the outside of the guide post (602), and the first spring... A connecting plate (604) is fixed to one end of the spring (603). Slide grooves (605) are provided on both sides inside the connecting cylinder (3). Slide blocks (606) are fixed on both sides of the connecting plate (604) inside the slide groove (605). First blocks (607) are fixed on both sides of the drive shaft (2) inside the slide groove (605). Second blocks (608) are fixed on both sides of the drive shaft (2) on one side of the first block (607). Threaded holes (609) are provided on both sides of the connecting cylinder (3). Threaded rods (610) are installed inside the threaded holes (609). The cylinder (1) is equipped with a transmission structure (7).

2. An actuator ram for an aircraft landing gear according to claim 1, characterised in that: The connecting cylinder (3) has an internal groove (605) with built-in grooves (611) on both sides. A limit block (612) is installed at one end of the threaded rod (610) between the first stop (607) and the second stop (608). A second spring (613) is installed on the outside of the threaded rod (610) on one side of the limit block (612). A rotating block (614) is fixed at one end of the threaded rod (610). A rotating groove (615) is provided inside the limit block (612) on the outside of the rotating block (614).

3. An actuator cylinder for an aircraft landing gear according to claim 1, characterised in that: The other end of the first spring (603) is fixedly connected to one end inside the connecting cylinder (3). The connecting plate (604) and the connecting cylinder (3) form a telescopic structure through the first spring (603). The sliding groove (605) is symmetrically distributed on both sides inside the connecting cylinder (3). The slider (606) and the connecting cylinder (3) form a sliding connection through the sliding groove (605).

4. An actuator cylinder for an aircraft landing gear according to claim 1, characterised in that: The first stop (607) and the second stop (608) are slidably connected to the connecting cylinder (3) through the sliding groove (605). The first stop (607) and the second stop (608) are symmetrically distributed on both sides of the transmission shaft (2). The threaded hole (609) is symmetrically distributed on both sides of the connecting cylinder (3). The threaded rod (610) is threadedly connected to the threaded hole (609).

5. An actuator ram for an aircraft landing gear according to claim 2, wherein: The limiting block (612) is fitted into the built-in groove (611), the bottom end of the second spring (613) abuts against the top end of the limiting block (612), the rotating block (614) and the limiting block (612) are rotatably connected through the rotating groove (615), the two sides of the limiting block (612) abut against one side of the first stop (607) and the second stop (608) respectively, and the transmission shaft (2) and the limiting block (612) are engaged through the first stop (607) and the second stop (608).

6. An actuator cylinder for an aircraft landing gear according to claim 1 wherein: The transmission structure (7) includes a DC motor (701) installed at one end inside the cylinder (1). Guide grooves (702) are provided on both sides inside the cylinder (1). A movable plate (703) is installed inside the cylinder (1). Guide blocks (704) are fixed on both sides of the movable plate (703) inside the guide groove (702). A lead screw (705) is fixed at the output end of the DC motor (701). A fixed cylinder (706) is fixed at one end of the movable plate (703) outside the lead screw (705). A threaded groove (707) is provided on the outside of the lead screw (705) inside the fixed cylinder (706).

7. An actuator ram for an aircraft landing gear according to claim 6, wherein: The guide groove (702) is symmetrically distributed on both sides inside the cylinder (1). The guide block (704) and the cylinder (1) are slidably connected through the guide groove (702). The lead screw (705) and the fixed cylinder (706) are threadedly connected through the thread groove (707).

Images