Straight line guide and anti-friction transmission mechanism in variable cycle engine mode conversion valve

Abstract

The application discloses a linear guide and wear-reducing transmission mechanism in a variable cycle engine mode conversion valve, which is used for changing the working state of the engine to adapt to different flight conditions and belongs to the technical field of high-performance gas turbine engines in aerospace technology. The transmission mechanism is located at the inlet of the engine mode conversion valve and comprises a retainer, a hydraulic actuating cylinder, a steering shaft, a transmission shaft, a linear bearing, an actuating ring and an actuating window. The application cooperates with a mode selection valve in an adjustable mechanism of the variable cycle engine to adjust, realizes the conversion of the mode selection valve between two modes of valve opening and closing, and makes the engine have optimal performance in a wider working range. Through the guiding effect of the linear bearing, the friction and wear generated in the working process of the transmission mechanism can be reduced, and the working stability and reliability of the driving control mode conversion valve in the adjustable mechanism of the engine are increased.

Description

Technical Field

[0001] This invention relates to the field of high-performance gas turbine engine technology in aerospace technology, and in particular to a linear guide and wear-reducing transmission mechanism in a variable cycle engine mode switching valve. Background Technology

[0002] A variable cycle engine is a gas turbine engine that can achieve different thermodynamic cycles by changing the geometry, size, or position of some engine components on the same engine. The core component of a variable cycle engine is the mode switching valve, which is used to adjust the engine's turbojet or turbofan operating mode. Due to the geometric limitations of the mode switching valve's transmission mechanism, it often experiences significant impacts and vibrations during operation. This not only affects the service life of the connecting joints but can also cause movement stagnation in the transmission mechanism, thus affecting the engine's variable cycle function.

[0003] Although existing technologies related to mode selection valves exist in my country, in engineering practice, transmission mechanisms frequently experience motion jamming and severe wear on connecting joints, ultimately leading to the failure of the engine's variable cycle function. Therefore, there is an urgent need to provide a linear guide and wear-reducing transmission mechanism for variable cycle engine mode switching valves to solve the aforementioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide a linear guide and wear-reducing transmission mechanism in a variable cycle engine mode switching valve, which is used to ensure the smooth operation of the transmission mechanism of the variable cycle engine mode switching valve and reduce the friction and wear of the moving joints in the transmission mechanism.

[0005] To achieve the above objectives, the present invention provides a linear guide and friction-reducing transmission mechanism for a variable cycle engine mode switching valve, disposed at the inlet of the engine mode switching valve. The mechanism includes a retainer fixedly mounted on the inner wall of the engine's outer bypass duct inlet. An actuating ring is disposed inside the outer bypass duct inlet, and an actuating window is detachably connected to the side of the actuating ring away from the retainer. One end of a drive shaft is connected to the actuating ring, and the other end of the drive shaft is connected to a steering shaft. A friction-reducing component is fixedly mounted on the side of the retainer near the actuating ring, and the drive shaft is slidably sleeved inside the friction-reducing component. A pushing mechanism is fixedly mounted on the side of the retainer away from the actuating ring, and the output end of the pushing mechanism is hinged to the steering shaft. The pushing mechanism drives the actuating ring and the actuating window to move via the drive shaft.

[0006] Preferably, the pushing mechanism includes a hydraulic actuator cylinder body, which is fixedly mounted on the first retainer. A hydraulic actuator drive shaft is slidably mounted on the inner side of the hydraulic actuator cylinder body. A ball joint is provided at the end of the hydraulic actuator drive shaft. The steering shaft is connected and fixed to the ball joint by a screw.

[0007] Preferably, the steering shaft and the drive shaft are interference-fitted, and the drive shaft and the actuating ring are interference-fitted.

[0008] Preferably, the friction-reducing component is a linear bearing.

[0009] Preferably, the linear bearing includes a housing, rolling elements, a second cage, and sealing washers. The housing is fixedly mounted on the first cage, the second cage is fixedly mounted on the inner wall of the housing, the rolling elements are mounted on the second cage, and the drive shaft is transition-fitted with the inner wall of the second cage. The sealing washers are mounted at both ends of the second cage.

[0010] Preferably, the actuating ring is a thin-walled cylindrical component.

[0011] Preferably, the actuating ring has two equally spaced recessed holes 1 at one end near the pushing mechanism, and the drive shaft passes through the recessed holes 1 and is connected and fixed to the actuating ring through a fixing ring; the actuating ring has a plurality of equally spaced recessed holes 2 at one end away from the pushing mechanism, and the actuating window is connected and fixed to the recessed holes 2 through a bolt assembly.

[0012] Preferably, a lug is fixedly provided on the outer wall of the actuation window, and the lug is detachably connected to the bolt assembly.

[0013] Preferably, both ends of the drive shaft are chamfered, and the cross-section of the drive shaft is circular.

[0014] Preferably, the section of the drive shaft near the steering shaft is a coarse diameter section, the middle section of the drive shaft transitions into the friction reduction component, the middle section of the drive shaft has the same diameter as the coarse diameter section, the section of the drive shaft near the actuating ring is a fine diameter section, and the fixing ring is detachably mounted on the fine diameter section.

[0015] Compared with the prior art, the present invention has the following advantages and technical effects:

[0016] The linear guide and friction-reducing transmission mechanism in the variable cycle engine mode switching valve provided by this invention contacts the drive shaft via linear bearings. This design increases the effective guiding length of the transmission mechanism, eliminating not only the overturning moment caused by the limitations of the original structure but also significantly enhancing the stability and accuracy of the transmission. Because the linear bearings provide smooth and stable guidance, the transmission linkage moves more smoothly during operation, thereby reducing unnecessary vibration and friction. Furthermore, this design effectively improves the transmission efficiency of the transmission mechanism, reduces energy loss, and provides a more efficient and stable power transmission for the entire mechanical system.

[0017] In linear bearings within a transmission mechanism, the internal balls directly contact the outer surface of the drive shaft. This design transforms the sliding friction between the drive shaft and cage into rolling friction between the balls and the outer surface of the drive shaft. This transformation offers significant advantages: the coefficient of friction in rolling friction is much lower than that in sliding friction, resulting in higher transmission efficiency and less power loss. Furthermore, the wear from rolling friction is far less than that from sliding friction, thereby improving the lifespan and stability of the transmission mechanism. This effectively enhances the transmission performance and stability of the transmission mechanism while extending its service life. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the transmission mechanism of the present invention;

[0020] Figure 2 This is a schematic diagram showing the installation of the transmission mechanism of the present invention with the engine's outer bypass duct inlet;

[0021] Figure 3 This is a schematic diagram of the structure of the hydraulic actuator cylinder of the present invention;

[0022] Figure 4 This is a schematic diagram of the transmission shaft of the present invention;

[0023] Figure 5 This is a schematic diagram of the linear bearing structure of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the actuator ring of the present invention;

[0025] Figure 7 This is a schematic diagram of the actuator ring from another perspective of the present invention;

[0026] In the diagram: 1. Cage 1; 2. Hydraulic actuator cylinder body; 3. Hydraulic actuator drive shaft; 4. Ball joint; 5. Steering shaft; 6. Drive shaft; 6-1. Large diameter section; 6-2. Middle section; 6-3. Small diameter section; 7. Linear bearing; 8. Actuating ring; 8-1. Hole 1; 8-2. Hole 2; 9. Engine outer bypass duct inlet; 10. Actuating window; 11. Retaining ring; 12. Bolt assembly; 13. Housing; 14. Rolling element; 15. Cage 2; 16. Sealing gasket. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. The described embodiments are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] like Figures 1 to 7 As shown, this invention provides a linear guide and friction-reducing transmission mechanism in a variable cycle engine mode switching valve, which is disposed at the inlet of the engine mode switching valve. The transmission mechanism includes a cage 1, which is fixedly installed on the inner wall of the engine outer bypass inlet 9. An actuating ring 8 is disposed inside the engine outer bypass inlet 9. An actuating window 10 is detachably connected to the side of the actuating ring 8 away from the cage 1. One end of a drive shaft 6 is connected to the actuating ring 8, and the other end of the drive shaft 6 is connected to a steering shaft 5. The steering shaft 5 and the drive shaft 6 are interference-fitted. The actuator 6 is interference-fitted with the actuator ring 8; a friction-reducing component is fixedly installed on the side of the cage 1 near the actuator ring 8, the friction-reducing component is a linear bearing 7, and the drive shaft 6 is slidably sleeved on the inner side of the friction-reducing component; a pushing mechanism is fixedly installed on the side of the cage 1 away from the actuator ring 8; the pushing mechanism includes a hydraulic actuator cylinder body 2, the hydraulic actuator cylinder body 2 is fixedly installed on the cage 1, a hydraulic actuator cylinder drive shaft 3 is slidably installed on the inner side of the hydraulic actuator cylinder body 2, a ball joint 4 is provided at the end of the hydraulic actuator cylinder drive shaft 3, and the steering shaft 5 is fixedly connected to the ball joint 4 by a screw.

[0029] By precisely controlling the oil pressure within the hydraulic actuator cylinder 2, the hydraulic actuator drive shaft 3 is driven to move left and right within the cylinder 2. This movement, via the transmission shaft 6, drives the actuator ring 8 and the actuator window 10, thereby controlling the opening and closing of the mode selection valve. The linear bearing 7 changes the friction between components from sliding friction to rolling friction, significantly reducing friction and improving transmission smoothness and durability. Simultaneously, the rolling friction of the steel balls offers better adaptability, buffering and absorbing impacts, thus improving transmission stability and noise suppression.

[0030] Furthermore, the linear bearing 7 includes a housing 13, rolling elements 14, a second cage 15, and sealing washers 16. The housing 13 is fixedly mounted on the first cage 1, the second cage 15 is fixedly mounted on the inner wall of the housing 13, the rolling elements 14 are mounted on the second cage 15, and the drive shaft 6 is transitionally fitted with the inner wall of the second cage 15. The sealing washers 16 are installed at both ends of the second cage 15.

[0031] The linear bearing 7 supports and guides linear motion through the rolling of the rolling elements 14, achieving high-precision linear motion. It features a compact structure, high precision, and low wear. The inner ring of the cage 15 of the linear bearing 7 is fitted to the drive shaft 6 via a cross-fit, ensuring interchangeability and facilitating installation, disassembly, and maintenance.

[0032] Furthermore, the actuating ring 8 is a thin-walled cylindrical part; the end of the actuating ring 8 near the pushing mechanism has two recessed holes 8-1 at equal intervals along the circumference, the drive shaft 6 passes through the recessed holes 8-1 and is connected and fixed to the actuating ring 8 through the fixing ring 11; the end of the actuating ring 8 away from the pushing mechanism has several recessed holes 8-2 at equal intervals along the circumference, and the actuating window 10 is connected and fixed to the recessed holes 8-2 through the bolt assembly 12.

[0033] Furthermore, a lug is fixedly provided on the outer wall of the actuation window 10, and the lug is detachably connected to the bolt assembly 12.

[0034] Furthermore, both ends of the drive shaft 6 are chamfered, and the cross-section of the drive shaft 6 is circular.

[0035] Furthermore, the section of the drive shaft 6 near the steering shaft 5 is a coarse diameter section 6-1, the middle section 6-2 of the drive shaft 6 transitions into the wear reduction component, the middle section 6-2 of the drive shaft 6 has the same diameter as the coarse diameter section 6-1, and the section of the drive shaft 6 near the actuating ring 8 is a fine diameter section 6-3, and the retaining ring 11 is detachably mounted on the fine diameter section 6-3.

[0036] The linear guide and anti-friction transmission mechanism in the variable cycle engine mode switching valve provided by this invention has the following working principle:

[0037] When the hydraulic actuator drive shaft 3 moves, it drives the steering shaft 5, transmission shaft 6, linear bearing 7, actuator ring 8, and actuator window 10 to move linearly. The steering shaft 5 has a certain height on the guide perpendicular to the linear motion, which generates an overturning moment. The overturning moment acts on the hydraulic actuator drive shaft 3. Compared with the ball joint 4 at the end, the rigid connecting rod of the hydraulic actuator drive shaft 3 has higher stiffness. Therefore, the overturning moment mainly acts on the ball joint 4 at the end, resulting in wear of the ball joint 4 and jamming of the transmission mechanism.

[0038] After the linear bearing 7 is installed, its inner ring engages with the drive shaft 6, and its outer shell 13 is fixed to the cage 1. At this time, the overturning moment will also act on the linear bearing 7, but due to the characteristics of the linear bearing 7, the force flow of the overturning moment will be guided through the linear bearing 7 to the cage 1, ultimately acting on the ground. Since the overturning moment acting on the drive shaft 6 is eliminated, the linear guidance function of the transmission mechanism is achieved. Furthermore, the rolling elements 14 inside the linear bearing 7 contact the surface of the drive shaft 6, realizing a change in the contact method and reducing friction and wear on the surface of the drive shaft 6, thus achieving the wear reduction function of the transmission mechanism. This invention has a simple structure, reasonable design, compact structure, low friction and wear, reduced hinge working stress, stable performance, and is easy to implement.

[0039] This invention works in conjunction with the mode selection valve in the adjustable mechanism of a variable cycle engine to switch between open and closed modes, enabling the engine to achieve optimal performance over a wider operating range. The guiding action of the linear bearing 7 reduces frictional wear in the transmission mechanism during operation, increasing the stability and reliability of the active control mode switching valve in the engine's adjustable mechanism.

[0040] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A linear guide and anti-friction type transmission mechanism in a variable cycle engine mode conversion valve provided at the inlet of the engine mode conversion valve, characterized in that, The system includes a cage (1), which is fixedly installed on the inner wall of the engine outer bypass inlet (9). An actuating ring (8) is provided inside the engine outer bypass inlet (9). An actuating window (10) is detachably connected to the side of the actuating ring (8) away from the cage (1). One end of a drive shaft (6) is connected to the actuating ring (8), and the other end of the drive shaft (6) is connected to a steering shaft (5). The steering shaft (5) has a certain height on the guide path perpendicular to the linear motion, which will generate an overturning moment. A friction-reducing component is fixedly installed on the side of the cage (1) near the actuating ring (8). The friction-reducing component is a linear bearing (7). The drive shaft (6) is slidably sleeved on the inner side of the friction-reducing component. The linear bearing (7) includes a housing (13), rolling elements (14), a cage (15), and a sealing gasket (16). The shell (13) is fixedly mounted on the first retainer (1), the second retainer (15) is fixedly mounted on the inner wall of the shell (13), the rolling element (14) is mounted on the second retainer (15), the drive shaft (6) is transitionally fitted with the inner wall of the second retainer (15); the sealing gasket (16) is mounted on both ends of the second retainer (15); a push mechanism is fixedly mounted on the side of the first retainer (1) away from the actuating ring (8), the output end of the push mechanism is hinged to the steering shaft (5), and the push mechanism drives the actuating ring (8) and the actuating window (10) to move through the drive shaft (6); the linear bearing (7) is used to convert the sliding friction between the drive shaft (6) and the first retainer (1) into rolling friction, and guide the overturning moment force flow to the first retainer (1) through the linear bearing (7).

2. The linear guide and anti-friction type transmission mechanism in a variable cycle engine mode conversion valve according to claim 1, characterized by, The pushing mechanism includes a hydraulic actuator cylinder body (2), which is fixedly installed on the first retainer (1). A hydraulic actuator drive shaft (3) is slidably installed on the inner side of the hydraulic actuator cylinder body (2). A ball joint (4) is provided at the end of the hydraulic actuator drive shaft (3). The steering shaft (5) is fixedly connected to the ball joint (4) by a screw.

3. The linearly guided and anti-friction type transmission mechanism in the variable cycle engine mode conversion valve according to claim 1, characterized by, The steering shaft (5) and the transmission shaft (6) are interference-fitted, and the transmission shaft (6) and the actuating ring (8) are interference-fitted.

4. The linear guide and friction-reducing transmission mechanism in the variable cycle engine mode switching valve according to claim 1, characterized in that, The actuating ring (8) is a thin-walled cylindrical component.

5. The linear guide and anti-friction transmission mechanism in the variable cycle engine mode switching valve according to claim 4, characterized in that, The actuating ring (8) has two recessed holes (8-1) at equal intervals along the circumference at one end near the pushing mechanism. The transmission shaft (6) passes through the recessed hole (8-1) and is connected and fixed to the actuating ring (8) through the fixing ring (11). The actuating ring (8) has several recessed holes (8-2) at equal intervals along the circumference at one end away from the pushing mechanism. The actuating window (10) is connected and fixed to the recessed hole (8-2) through the bolt assembly (12).

6. The linear guide and anti-friction transmission mechanism in the variable cycle engine mode switching valve according to claim 5, characterized in that, A lug is fixedly provided on the outer wall of the actuation window (10), and the lug is detachably connected to the bolt assembly (12).

7. The linear guide and wear-reducing transmission mechanism in the variable cycle engine mode switching valve according to claim 5, characterized in that, Both ends of the drive shaft (6) are chamfered, and the cross section of the drive shaft (6) is circular.

8. The linear guide and anti-friction transmission mechanism in the variable cycle engine mode switching valve according to claim 7, characterized in that, The section of the drive shaft (6) near the steering shaft (5) is a coarse diameter section (6-1), the middle section (6-2) of the drive shaft (6) is transitionally fitted with the anti-friction component, the middle section (6-2) of the drive shaft (6) has the same diameter as the coarse diameter section (6-1), the section of the drive shaft (6) near the actuating ring (8) is a fine diameter section (6-3), and the fixing ring (11) is detachably installed on the fine diameter section (6-3).

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