Back-turning type space cabin door turning mechanism

Abstract

The invention provides a rear-turning type space cabin door turning mechanism. The rear-turning type space cabin door turning mechanism comprises a six-connecting-rod mechanism and a driving mechanism. The six-connecting-rod mechanism comprises a cabin door connecting rod and a rocker; the driving mechanism comprises an actuating cylinder and a fixed support III; the cabin door connecting rod is fixed on the cabin door; the fixed support III is mounted on the cabin body; the bottom and the top of the actuating cylinder are hinged to the third fixing support and the rocker correspondingly, and rotating pairs are formed. The six-connecting-rod mechanism is a motion transmission mechanism; the actuating cylinder does linear telescopic motion under the action of the motor, the action of force is applied to the hinged position of the actuating cylinder and the rocker, the action of the force is transmitted to the cabin door through the six-connecting-rod mechanism, and opening and closing of the cabin door are achieved.

Description

Technical Field

[0001] This invention belongs to the field of aircraft mechanism design, specifically relating to a space hatch flipping mechanism for a reusable aerospace vehicle. Background Technology

[0002] Most existing spacecraft hatches are two-panel, opposing-opening designs, using extension and retraction mechanisms to drive the left and right hatches to open and close separately. For example, the spacecraft hatches of the Space Shuttle and X-37B consist of two panels, left and right, which are driven by extension and retraction mechanisms located on the left and right panels to open and close around a fixed axis. The overall rigidity of the two-panel, opposing-opening hatch structure is relatively poor, and multiple locking mechanisms are required to connect and lock the left and right hatches. Most opposing-opening spacecraft hatch mechanisms use a rotational motion around a fixed hinge axis. This fixed hinge protrudes from the outer surface of the spacecraft, affecting its aerodynamic shape. Furthermore, during reentry, the protruding fixed hinge causes localized thermal degradation, requiring the fixed hinge to withstand extremely high temperatures or to have additional thermal protection measures to reduce its temperature. Summary of the Invention

[0003] The purpose of this invention is to provide a rear-flipping space hatch flipping mechanism to enable the space hatch to be repeatedly opened and closed with a large overall range.

[0004] This invention provides a rear-hinged space hatch tilting mechanism, comprising: a six-bar linkage and a drive mechanism; the six-bar linkage includes a hatch linkage and a rocker arm; the drive mechanism includes an actuator and a fixed support three; the hatch linkage is fixed to the hatch; the fixed support three is mounted on the cabin body; the bottom and top of the actuator are respectively hinged to the fixed support three and the rocker arm, forming a revolute joint; the six-bar linkage is a motion transmission mechanism; the actuator performs linear telescopic motion under the action of a motor, applying force at the hinge point between the actuator and the rocker arm, and transmitting the force to the hatch through the six-bar linkage, thereby realizing the opening and closing of the hatch.

[0005] Furthermore, there are two sets of tilting mechanisms, symmetrically arranged on both sides of the hatch, and the two sets of tilting mechanisms are completely identical.

[0006] Furthermore, when the actuator moves upward, the entire hatch flips back and opens; when it moves downward, the entire hatch closes.

[0007] Furthermore, the six-bar linkage includes a four-bar linkage one and a four-bar linkage two;

[0008] The four-bar linkage includes a hatch link, a first link, a second link, and a rocker arm; both ends of the hatch link are hinged to one end of the first link and one end of the second link, respectively, forming a revolute joint; the other end of the first link is hinged to one end of the rocker arm, forming a revolute joint; the other end of the second link is hinged to the middle position of the rocker arm, forming a revolute joint.

[0009] The four-bar linkage includes a third link, a second link, a rocker arm, a first fixed support, and a second fixed support. The other end of the rocker arm is hinged to the second fixed support to form a revolute joint. Both ends of the third link are hinged to the middle positions of the first fixed support and the second link, respectively, forming revolute joints. The first fixed support and the second fixed support are fixed to the cabin.

[0010] Furthermore, the door linkage, linkage one, linkage two, and rocker arm together form the four-bar linkage one; the linkage two, linkage three, rocker arm, fixed support one, and fixed support two together form the four-bar linkage two.

[0011] Furthermore, the motor is a linear motor, used to drive the actuator cylinder to perform linear telescopic motion, thereby realizing the automatic opening and closing of the hatch.

[0012] Furthermore, the linear motor has a power-off self-locking function, which is used to achieve support locking when the hatch is in the unfolded state.

[0013] Furthermore, the six-bar linkage moves by first lifting and then rotating when the hatch is opened.

[0014] The beneficial effects of this invention are as follows:

[0015] 1. The present invention provides a rear-flipping space hatch flipping mechanism, which provides a new configuration for the repeated opening and closing of space hatches of aerospace vehicles.

[0016] 2. The present invention provides a rear-flipping space hatch flipping mechanism in which all components are installed inside the aircraft cabin, solving the problem that the protrusion of the traditional fixed hinge affects the aerodynamic shape.

[0017] 3. The present invention provides a rear-flipping space hatch flipping mechanism, which transforms the motion of the six-bar linkage mechanism into a composite motion of "lifting + rotating" of the hatch, thus solving the problem of interference between the large-angle opening of the space hatch and the cabin body. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 This is a front view of the space hatch in the closed state according to an embodiment of the present invention;

[0020] Figure 2 This is a front view of the space hatch opened at 90° according to an embodiment of the present invention;

[0021] Figure 3 This is an isometric view of the space hatch opening 90° according to an embodiment of the present invention;

[0022] Figure 4 This is a front view of the space hatch closing state flipping mechanism according to an embodiment of the present invention;

[0023] Figure 5 This is a front view of the space hatch opening and flipping mechanism according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the motion principle of the space hatch flipping mechanism according to an embodiment of the present invention.

[0025] Wherein: 1-Hatch door; 2-Tilting mechanism; 3-Hatch body; 21-Hatch door linkage; 22-Link 1; 23-Rock arm; 24-Link 2; 25-Link 3; 26-Actuator cylinder; 27-Fixed support 1; 28-Fixed support 2; 29-Fixed support 3 Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0027] This embodiment provides a rear-flipping space hatch flipping mechanism, including a hatch 1, a flipping mechanism 2, and a hatch body 3.

[0028] The flipping mechanism 2 is connected to the hatch 1 via the hatch linkage 21. Each fixed support in the flipping mechanism 2 is installed on the cabin 3. When the flipping mechanism 2 moves forward, the space hatch 1 is flipped back and opened by 90° (a larger angle can be opened as needed). When the flipping mechanism moves in reverse, the space hatch 1 is closed.

[0029] The rear-flipping space hatch 1 uses two sets of flipping mechanisms 2, which are symmetrically arranged on both sides of the hatch 1 and their projections in the XOY plane completely overlap.

[0030] The flipping mechanism 2 consists of a six-bar linkage and a drive mechanism.

[0031] The six-bar linkage consists of two sets of four-bar linkages. The hatch linkage 21 is fixed to the hatch 1. One end of the hatch linkage 21 is hinged to the first linkage 22 to form a revolute joint, and the other end is hinged to the second linkage 24 to form a revolute joint. The other end of the first linkage 22 is hinged to one end of the rocker arm 23 to form a revolute joint. At the same time, the other end of the second linkage 24 is hinged at the middle position of the rocker arm 23 to form a revolute joint. The hatch linkage 21, the first linkage 22, the second linkage 24 and the rocker arm 23 form the first four-bar linkage.

[0032] The middle position of connecting rod 24 is hinged to one end of connecting rod 3 25 to form a revolute joint; the other end of connecting rod 3 25 is hinged to fixed support 1 27 to form a revolute joint; the other end of rocker arm 23 is hinged to fixed support 28 to form a revolute joint; fixed support 1 27 and fixed support 28 are both installed on the cabin 3; connecting rod 3 25, connecting rod 2 24, and rocker arm 23 are combined to form a four-bar linkage 2.

[0033] The combination of four-bar linkage 1 and four-bar linkage 2 forms a six-bar linkage. Link 24 and rocker 23 are both components of four-bar linkage 1 and four-bar linkage 2.

[0034] The drive mechanism consists of an actuating cylinder 26 and a fixed support 29. The actuating cylinder 26 can perform linear telescopic motion under the drive of a linear motor, and is regarded as a translational joint. The bottom is hinged to the fixed support 29 to form a revolute joint, and the top is hinged to the rocker arm 23 to form a revolute joint.

[0035] The six-bar linkage is a motion transmission mechanism. A linear motor drives the actuator 26 to perform linear telescopic motion. Through the force transmitted by the six-bar linkage, the space hatch 1 is automatically opened and closed. The linear motor has a power-off self-locking function, which can realize the support locking of the space hatch 1 when it is in the unfolded state.

[0036] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rear hinged space hatch flip mechanism, characterized in that, include: A six-bar linkage and a drive mechanism; the six-bar linkage includes a door linkage (21) and a rocker arm (23); the drive mechanism includes an actuating cylinder (26) and a fixed support three (29); the door linkage (21) is fixed on the door (1); the fixed support three (29) is installed on the cabin body (3); the bottom and top of the actuating cylinder (26) are respectively hinged to the fixed support three (29) and the rocker arm (23), forming a rotating pair; the six-bar linkage is a motion transmission mechanism; the actuating cylinder (26) performs linear telescopic motion under the action of the motor, and a force is applied at the hinge of the actuating cylinder (26) and the rocker arm (23), and the force is transmitted to the door (1) through the six-bar linkage to realize the opening and closing of the door (1).

2. The rear-folding space hatch turnover mechanism according to claim 1, wherein There are two sets of flipping mechanisms (2), which are symmetrically arranged on both sides of the hatch (1), and the two sets of flipping mechanisms are exactly the same.

3. The rear-folding space hatch door flipping mechanism according to claim 1, wherein, When the actuator (26) moves upward, the hatch (1) flips backward and opens as a whole; when it moves downward, the hatch (1) closes as a whole.

4. The rear-folding space hatch door flipping mechanism according to claim 1, wherein, The six-bar linkage includes four-bar linkage one and four-bar linkage two; The four-bar linkage includes a hatch link (21), a first link (22), a second link (24), and a rocker arm (23); both ends of the hatch link (21) are hinged to one end of the first link (22) and one end of the second link (24), respectively, forming a revolute joint; the other end of the first link (22) is hinged to one end of the rocker arm (23), forming a revolute joint; the other end of the second link (24) is hinged to the middle position of the rocker arm (23), forming a revolute joint. The four-bar linkage includes a third link (25), a second link (24), a rocker arm (23), a first fixed support (27), and a second fixed support (28). The other end of the rocker arm (23) is hinged to the second fixed support (28) to form a rotating joint. The two ends of the third link (25) are respectively hinged to the middle positions of the first fixed support (27) and the second link (24) to form rotating joints. The first fixed support (27) and the second fixed support (28) are fixed to the cabin (3).

5. The rear-folding space hatch flip mechanism of claim 4, wherein, The door link (21), link one (22), link two (24) and rocker arm (23) together form the first four-bar linkage; the link two (24), link three (25), rocker arm (23), fixed support one (27) and fixed support two (28) together form the second four-bar linkage.

6. The rear-folding space hatch flip mechanism of claim 1, wherein, The motor is a linear motor, used to drive the actuator (26) to perform linear telescopic motion, thereby realizing the automatic opening and closing of the hatch (1).

7. The rear-folding space hatch flip mechanism of claim 6, wherein, The linear motor has a power-off self-locking function, which is used to achieve support locking of the hatch (1) in the unfolded state.

8. The rear hinged space hatch flip mechanism according to any one of claims 1 or 4, wherein, The six-bar linkage moves by first lifting and then rotating when the hatch (1) is opened.

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