Heat dissipation type gearbox device of aviation equipment

Abstract

The invention discloses a heat dissipation type gearbox device of aviation equipment, which comprises a gearbox body side wall, a bearing seat, a first rolling bearing, a gear shaft and a gear, the gear shaft is mounted in the bearing seat through the first rolling bearing, a heat dissipation fan is mounted on the right end shaft section of the gear shaft, and the heat dissipation fan comprises a first fan wheel, a second fan wheel and a shell; the device is characterized in that the hub is mounted on the right end shaft section through a second rolling bearing; the clutch assembly comprises a first groove, a clutch pin, a spring and a second groove, the first groove is formed in the radial inner circumferential side of the rear cover disc, the clutch pin and the spring are connected into the first groove, and the second groove corresponding to the first groove in position is formed in the radial outer circumferential side of the base disc; under the action of centrifugal force generated at different rotating speeds, the clutch assembly enables the first fan wheel and the second fan wheel to be in a joint / separation state. The air volume of the cooling fan can be increased, the heat exchange efficiency of air in the inner cavity of the gearbox is improved, and the cooling effect on bearings and gears is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gear box device of aviation equipment, and particularly relates to a heat dissipation type gear box device of aviation equipment. BACKGROUND

[0002] The existing heat dissipation type gear box device of aviation equipment comprises a gear box body side wall, a bearing seat, a first rolling bearing, a gear shaft, a gear, and a heat dissipation fan. A plurality of gear shafts and gears are installed in the box body. The bearing seat is installed in the mounting hole of the box body side wall. The gear shaft is installed in the bearing seat through the first rolling bearing. The heat dissipation fan is installed on the right end shaft segment of the gear shaft and outside the box body side wall. The heat dissipation fan is a centrifugal heat dissipation fan or an axial flow heat dissipation fan.

[0003] However, the heat dissipation fan of the existing gear box device still has the problem that the air volume of the heat dissipation fan cannot be well matched with the rotation speed of the gear shaft at different rotation speeds, the flow loss of the heat dissipation fan is large, and the heat exchange efficiency and the heat dissipation effect of the gear box need to be further improved. SUMMARY

[0004] The present application aims to overcome the deficiencies in the prior art and provide a heat dissipation type gear box device of aviation equipment. Through the improved design of the heat dissipation fan, the effective working area, size, and / or airflow path of the fan wheel are increased at low rotation speed. At high rotation speed, the first fan wheel rotates at high speed, and the second fan wheel is passively rotated under the driving of the airflow and plays a guiding role for the inlet airflow of the first fan wheel. Thus, the air volume of the heat dissipation fan can be improved / ensured, the heat exchange / gas exchange efficiency of the gas in the cavity of the gear box can be improved, the heat dissipation effect of the bearing and the gear can be improved, and the operation stability and service life of the gear box can be improved / ensured.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: A heat-dissipating gearbox device for aviation equipment includes a gearbox housing sidewall, a bearing housing, a first rolling bearing, a gear shaft, gears, and a cooling fan. Multiple gear shafts and gears are installed inside the housing. A bearing housing is installed in a mounting hole in the sidewall of the housing. The gear shaft is mounted in the bearing housing via the first rolling bearing. A cooling fan is installed on the right end section of the gear shaft, located outside the sidewall of the housing. The cooling fan includes a first fan wheel, a second fan wheel, and a housing. The housing is fixedly connected to the end flange of the bearing housing. The first fan wheel and the second fan wheel are installed within a fan wheel cavity enclosed by the housing, with the second fan wheel located within the cavity of the first fan wheel. The first fan wheel includes a front cover plate, a rear cover plate, first fan blades, and a connecting plate. Multiple first fan blades are circumferentially distributed and connected between the front cover plate and the rear cover plate. A connecting plate is located on the radially inner circumferential side of the rear cover plate, and the connecting plate is connected to the gear shaft. The right-end shaft segment is connected by a drive; the second fan wheel includes a chassis, a second fan blade, and a hub, with multiple second fan blades distributed circumferentially along the chassis, and a hub is provided on the radial inner circumference of the chassis; the characteristic is that a second rolling bearing is installed in the hub groove on the inner circumference of the hub, and the hub is installed on the right-end shaft segment through the second rolling bearing; the cooling fan also includes a clutch assembly, which includes a first groove, a clutch pin, a spring, and a second groove. The first groove is provided on the radial inner circumference of the rear cover, and the clutch pin and spring are connected in the first groove. One end of the spring is connected to the bottom of the first groove, and the other end is connected to the clutch pin. The second groove is provided on the radial outer circumference of the chassis, and the second groove is positioned corresponding to the first groove; under the action of centrifugal force generated at different speeds, the clutch assembly causes the first fan wheel and the second fan wheel to be in an engaged / disengaged state.

[0006] Furthermore, when the gear shaft operates at low speed, under the action of a small centrifugal force, one end of the clutch pin is inserted into the second groove, and at this time it is in an engaged state. The first fan wheel and the second fan wheel are in an engaged state and rotate synchronously. At this time, the first fan wheel and the second fan wheel rotate together to act as centrifugal fan wheels.

[0007] Furthermore, when the gear shaft operates at high speed, under the action of a large centrifugal force, one end of the clutch pin does not insert into the second groove, and is in a separated state. The first fan wheel and the second fan wheel are in a separated state. At this time, the first fan wheel rotates at high speed, and the second fan wheel is passively rotated under the drive of the airflow and plays a guiding role for the inlet airflow of the first fan wheel.

[0008] Furthermore, the outer shell includes a front side panel, a rear side panel, a circumferential enclosure, and an outlet hole. The circumferential enclosure is connected between the front side panel and the rear side panel, and the outlet hole is provided on the upper part of the rear side panel.

[0009] Furthermore, the connecting plate is provided with a connecting hole, which connects the first gap between the connecting plate and the rear side plate and the second gap between the connecting plate and the chassis.

[0010] Furthermore, the front end of the hub has a sealing section, and there is a return cavity between the sealing section and the second rolling bearing. The inner circumferential surface of the sealing section is provided with a spiral groove, which can suppress the airflow at the front end of the hub from entering the return cavity from there. A drainage hole is provided on the hub, which is connected to the return cavity and the fan blade flow channel between two adjacent second fan blades.

[0011] Furthermore, a shallow groove is provided on the outer peripheral surface of the chassis, which extends circumferentially and serves as a guide for the clutch pin when it slides circumferentially into the second groove.

[0012] Furthermore, the airflow cooling path of the gearbox includes: gearbox inner cavity → first rolling bearing → first fan wheel inlet hole → second fan blade → first fan blade → outlet hole.

[0013] Furthermore, the airflow return path of the cooling fan includes return path one: first gap → connecting hole → second gap → second rolling bearing → return cavity → drainage hole → fan blade flow channel between two adjacent second fan blades.

[0014] Furthermore, the airflow return path of the cooling fan also includes a second return path: the airflow space between the second fan blade and the first fan blade → the second gap → the second rolling bearing → the return cavity → the drainage hole → the fan blade flow channel between two adjacent second fan blades.

[0015] This invention discloses a heat-dissipating gearbox device for aviation equipment. Through an improved design of the cooling fan, it increases the effective working area, size, and / or airflow path of the fan wheel at low speeds; at high speeds, the first fan wheel rotates at a high speed, while the second fan wheel passively rotates under the influence of airflow and guides the inlet airflow of the first fan wheel. This improves / ensures the airflow of the cooling fan, enhances the heat exchange / ventilation efficiency of the gas inside the gearbox, and improves the heat dissipation effect on bearings and gears, thereby improving / ensureing the operational stability and service life of the gearbox.

[0016] The cooling fan of this invention, through the design of the airflow return path, can reduce the flow / volume loss of the cooling fan, balance the axial force, thereby increasing / ensuring the air volume of the cooling fan, reducing vibration, and further improving the heat exchange / ventilation efficiency of the gas inside the gearbox, further improving the heat dissipation effect on the bearings and gears, thereby improving / ensuring the operational stability and service life of the gearbox. Attached Figure Description

[0017] Fig. 1 This is a partial structural schematic diagram of the heat dissipation type gearbox device for aviation equipment of the present invention. Fig. 2 This is a partially enlarged structural diagram of the first state of the heat dissipation type gearbox device for aviation equipment of the present invention. Fig. 3 This is a partially enlarged structural diagram of the second state of the heat dissipation type gearbox device for aviation equipment of the present invention.

[0018] In the diagram: 1. Gearbox housing sidewall; 2. Bearing seat; 3. First rolling bearing; 4. Gear shaft; 5. First fan wheel; 6. Second fan wheel; 7. Housing; 8. Clutch assembly; 9. Second rolling bearing; 10. Threaded fastener; 21. End flange; 41. Bushing; 51. Front cover plate; 52. Rear cover plate; 53. First fan blade; 54. Connecting plate; 55. Connecting hole; 61. Chassis; 62. Second fan blade; 63. Hub; 64. Return chamber; 65. Sealing section; 66. Drain hole; 71. Front side plate; 72. Rear side plate; 73. Circumferential surrounding plate; 74. Outlet hole; 81. First groove; 82. Clutch pin; 83. Spring; 84. Second groove. Detailed Implementation

[0019] To make the technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of the present invention, and are only used to explain the present invention, not to limit the present invention. It should be noted that, for ease of description, only the parts / structures related to the present invention are shown in the accompanying drawings. Other related parts can be referred to with ordinary design. In the absence of conflict, the embodiments and technical features in the embodiments of the present invention can be combined with each other to obtain new embodiments.

[0020] Based on 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. Furthermore, unless otherwise defined, the technical or scientific terms used in the description of this invention should have the ordinary meaning understood by those skilled in the art.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings.

[0022] like Figs. 1-3As shown, a heat-dissipating gearbox device for aviation equipment includes a gearbox housing sidewall 1, a bearing housing 2, a first rolling bearing 3, a gear shaft 4, gears, and a cooling fan. Multiple gear shafts 4 and gears are installed inside the housing. The bearing housing 2 is installed in the mounting holes of the housing sidewall 1. The gear shaft 4 is installed in the bearing housing 2 via the first rolling bearing 3. A cooling fan is installed on the right end of the gear shaft 4, located outside the housing sidewall 1. The cooling fan includes a first fan wheel 5, a second fan wheel 6, and a housing 7. The housing 7 is fixedly connected to the end flange 21 of the bearing seat 2. A first fan wheel 5 and a second fan wheel 6 are installed within the fan wheel cavity enclosed by the housing 7. The second fan wheel 6 is located within the inner cavity of the first fan wheel 5. The first fan wheel 5 includes a front cover plate 51, a rear cover plate 52, first fan blades 53, and a connecting plate 54. Multiple first fan blades 53 are evenly distributed circumferentially and connected between the front cover plate 51 and the rear cover plate 52. A connecting plate 54 is provided on the radially inner circumferential side of the rear cover plate 52. The connecting plate 54 is connected to the right end shaft section of the gear shaft 4. The cooling fan is dynamically connected; the second fan wheel 6 includes a chassis 61, second fan blades 62, and a hub 63. Multiple second fan blades 62 are evenly distributed circumferentially along the chassis 61, and a hub 63 is provided on the radial inner circumference of the chassis 61. The hub 63 is characterized by having a second rolling bearing 9 installed in a hub groove on the inner circumference of the hub 63, and the hub 63 is mounted on the right-end shaft section via the second rolling bearing 9. The cooling fan also includes a clutch assembly 8, which includes a first groove 81, a clutch pin 82, a spring 83, and a second groove 84. A first groove 81 is provided on the radial inner circumference of the rear cover plate 52. A clutch pin 82 and a spring 83 are connected in the first groove 81. One end of the spring 83 is connected to the bottom of the first groove 81, and the other end is connected to the clutch pin 82. A second groove 84 is provided on the radial outer circumference of the chassis 61. The second groove 84 is positioned corresponding to the first groove 81. Under the action of centrifugal force generated at different speeds, the clutch assembly 8 keeps the first fan wheel 5 and the second fan wheel 6 in an engaged / disengaged state.

[0023] When the gear shaft 4 / cooling fan operates at low speed (first speed range), under the action of a small centrifugal force, one end of the clutch pin 82 inserts into the second groove 84, and is in an engaged state. The first fan wheel 5 and the second fan wheel 6 are in an engaged state and rotate synchronously (e.g., Fig. 2 As shown in the diagram, the first fan wheel 5 and the second fan wheel 6 rotate together, acting as centrifugal fan wheels (the gear shaft 4 drives the first fan wheel 5 and the second fan wheel 6 to rotate). Therefore, at low speeds, by increasing the effective working area, size, and / or airflow path of the fan wheels, the airflow of the cooling fan can be increased / ensuring, improving the heat exchange / ventilation efficiency of the gas inside the gearbox, and enhancing the heat dissipation effect on the bearings and gears, thereby improving / ensuring the operational stability and service life of the gearbox.

[0024] When the gear shaft 4 / cooling fan operates at high speed (second speed range), under the action of a large centrifugal force, one end of the clutch pin 82 does not insert into the second groove 84, that is, the clutch pin 82 is separated from the second groove 84. At this time, it is in a separated state, and the first fan wheel 5 and the second fan wheel 6 are in a separated state (as shown in the image). Fig. 3 As shown in the diagram, the first fan wheel 5 rotates at a high speed, while the second fan wheel 6 passively rotates under the influence of the airflow, guiding the airflow into the first fan wheel 5 (the gear shaft 4 does not drive the second fan wheel 6 to rotate). Therefore, at high speeds, the first fan wheel 5 rotates at a high speed, and the second fan wheel 6 passively rotates under the influence of the airflow, guiding the airflow into the first fan wheel 5. This improves / ensures the airflow of the cooling fan, increases the heat / air exchange efficiency of the gas inside the gearbox, and improves the heat dissipation effect on the bearings and gears, thereby improving / enhancing the operational stability and service life of the gearbox.

[0025] The outer casing 7 includes a front side plate 71, a rear side plate 72, a circumferential surrounding plate 73, and an outlet hole 74. The circumferential surrounding plate 73 is connected between the front side plate 71 and the rear side plate 72, and the outlet hole 74 is provided on the upper part of the rear side plate 72.

[0026] In one embodiment, the connecting plate 54 is provided with a connecting hole 55, which connects the first gap G1 between the connecting plate 54 and the rear side plate 72 and the second gap G2 between the connecting plate 54 and the chassis 61.

[0027] In one embodiment, the front end of the hub 63 has a sealing section 65, and a return cavity 64 is provided between the sealing section 65 and the second rolling bearing 9. The inner circumferential surface of the sealing section 65 is provided with a spiral groove, which can suppress the airflow at the front end of the hub 63 from entering the return cavity 64 from there. The hub 63 is provided with a drainage hole 66, which is connected to the return cavity 64 and the fan blade flow channel between two adjacent second fan blades 62.

[0028] In one embodiment, a shallow / small depth groove is provided on the outer peripheral surface of the chassis 61. The shallow depth groove extends circumferentially and serves as a guide for the clutch pin 82 when it slides circumferentially into the second groove 84.

[0029] The clutch assembly 8 is one or more arranged circumferentially.

[0030] This invention discloses a heat-dissipating gearbox device for aviation equipment. Through an improved design of the cooling fan, it increases the effective working area, size, and / or airflow path of the fan wheel at low speeds; at high speeds, the first fan wheel 5 rotates at high speed, while the second fan wheel 6 passively rotates under the influence of airflow and guides the inlet airflow of the first fan wheel 5. This improves / ensures the airflow of the cooling fan, enhances the heat exchange / ventilation efficiency of the gas inside the gearbox, and improves the heat dissipation effect on bearings and gears, thereby improving / ensureing the operational stability and service life of the gearbox.

[0031] like Figs. 1-3 As shown, the arrow "→" indicates the direction of gas flow.

[0032] The airflow cooling path of the gearbox includes: gearbox inner cavity → first rolling bearing 3 → first fan wheel 5 inlet hole → second fan blade 62 → first fan blade 53 → outlet hole 74.

[0033] The airflow return path of the cooling fan includes return path one: first gap G1 → connecting hole 55 → second gap G2 → second rolling bearing 9 → return cavity 64 → guide hole 66 → fan blade flow channel between two adjacent second fan blades 62.

[0034] The airflow return path of the cooling fan also includes return path two: the airflow space between the second fan blade 62 and the first fan blade 53 → the second gap G2 → the second rolling bearing 9 → the return cavity 64 → the guide hole 66 → the fan blade flow channel between two adjacent second fan blades 62.

[0035] The cooling fan of this invention, through the design of the airflow return path, can reduce the flow / volume loss of the cooling fan, balance the axial force, thereby increasing / ensuring the air volume of the cooling fan, reducing vibration, and further improving the heat exchange / ventilation efficiency of the gas inside the gearbox, further improving the heat dissipation effect on the bearings and gears, thereby improving / ensuring the operational stability and service life of the gearbox.

[0036] A bushing 41 is installed on the right end of the gear shaft 4. A connecting plate 54 and a rear plate 72 are provided on the outer periphery of the bushing 41. A threaded fastener 10 is connected to the gear shaft 4 at the right end of the bushing 41. The two ends of the bushing 41 abut against the second rolling bearing 9 and the threaded fastener 10 / washer, respectively.

[0037] The cooling fan is a centrifugal cooling fan.

[0038] This invention discloses a heat-dissipating gearbox device for aviation equipment. Through an improved design of the cooling fan, it increases the effective working area, size, and / or airflow path of the fan wheel at low speeds; at high speeds, the first fan wheel 5 rotates at high speed, while the second fan wheel 6 passively rotates under the influence of airflow and guides the inlet airflow of the first fan wheel 5. This improves / ensures the airflow of the cooling fan, enhances the heat exchange / ventilation efficiency of the gas inside the gearbox, and improves the heat dissipation effect on bearings and gears, thereby improving / ensureing the operational stability and service life of the gearbox.

[0039] The cooling fan of this invention, through the design of the airflow return path, can reduce the flow / volume loss of the cooling fan, balance the axial force, thereby increasing / ensuring the air volume of the cooling fan, reducing vibration, and further improving the heat exchange / ventilation efficiency of the gas inside the gearbox, further improving the heat dissipation effect on the bearings and gears, thereby improving / ensuring the operational stability and service life of the gearbox.

[0040] The above embodiments are illustrative of the present invention and not intended to limit the invention. It is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat dissipation type gear box device of aviation equipment, comprising a gear box body side wall (1), a bearing seat (2), a first rolling bearing (3), a gear shaft (4), a gear, and a heat dissipation fan, the bearing seat is installed in the mounting hole of the gear box body side wall, the gear shaft is installed in the bearing seat through the first rolling bearing, the heat dissipation fan is installed on the right end shaft section of the gear shaft and outside the gear box body side wall, the heat dissipation fan comprises a first fan wheel (5), a second fan wheel (6), and a shell (7), the shell is fixedly connected with the end flange of the bearing seat, the first fan wheel and the second fan wheel are installed in the fan wheel cavity formed by the shell, and the second fan wheel is arranged in the inner cavity of the first fan wheel; the first fan wheel comprises a front cover disc (51), a rear cover disc (52), a plurality of first fan blades (53), and a connecting disc (54), the plurality of first fan blades are distributed in the circumferential direction and connected between the front cover disc and the rear cover disc, the connecting disc is arranged on the radial inner circumferential side of the rear cover disc, and the connecting disc is in transmission connection with the right end shaft section of the gear shaft; the second fan wheel comprises a bottom disc (61), a plurality of second fan blades (62), and a hub (63), the plurality of second fan blades are distributed in the circumferential direction of the bottom disc, and the hub is arranged on the radial inner circumferential side of the bottom disc; a second rolling bearing (9) is installed in the hub groove on the inner circumferential side of the hub, and the hub is installed on the right end shaft section through the second rolling bearing; the heat dissipation fan further comprises a clutch assembly (8), the clutch assembly comprises a first groove (81), a clutch pin (82), a spring (83), and a second groove (84), the first groove is arranged on the radial inner circumferential side of the rear cover disc, the clutch pin and the spring are connected in the first groove, one end of the spring is connected with the groove bottom of the first groove, the other end of the spring is connected with the clutch pin, the second groove is arranged on the radial outer circumferential side of the bottom disc, and the position of the second groove corresponds to the position of the first groove; under the action of centrifugal force generated at different rotating speeds, the clutch assembly makes the first fan wheel and the second fan wheel in the engagement / separation state. characterized in that When the gear shaft operates at a low rotating speed, under the action of small centrifugal force, one end of the clutch pin is inserted into the second groove, at this time, the first fan wheel and the second fan wheel are in the engagement state and rotate synchronously, at this time, the first fan wheel and the second fan wheel rotate together to play the role of a centrifugal fan.

2. An aircraft-mounted, heat-dissipating type gear box apparatus according to claim 1, wherein When the gear shaft operates at a high rotating speed, under the action of large centrifugal force, one end of the clutch pin is not inserted into the second groove, at this time, the first fan wheel and the second fan wheel are in the separation state, at this time, the first fan wheel rotates at a high rotating speed, and the second fan wheel is passively rotated under the driving of airflow and plays the role of guiding the inlet airflow of the first fan wheel.

3. An aircraft-mounted, heat-dissipating type gear box apparatus according to claim 1, wherein The shell comprises a front side plate (71), a rear side plate (72), a circumferential surrounding plate (73), and an outlet hole (74), the circumferential surrounding plate is connected between the front side plate and the rear side plate, and the outlet hole is arranged on the upper portion of the rear side plate.

4. An aeroequipped, heat-dissipating type gear case apparatus according to any one of claims 2 to 3, characterized in that, A communication hole (55) is arranged on the connecting disc, and the communication hole respectively communicates a first gap (G1) between the connecting disc and the rear side plate and a second gap (G2) between the connecting disc and the bottom disc.

5. An aircraft-mounted, air-cooled type gear box assembly as claimed in claim 4, wherein, ​ 6. An aircraft-mounted, air-cooled type gear box assembly as claimed in claim 5, wherein, The front end of the hub has a sealing section (65) with a backflow cavity (64) between the sealing section and the second rolling bearing, and the inner circumferential surface of the sealing section is provided with a spiral groove capable of inhibiting airflow at the front end of the hub from entering the backflow cavity therefrom.

7. An aircraft-mounted, air-cooled gearbox unit as claimed in claim 6, characterized in that The outer circumferential surface of the chassis is provided with a shallow-depth groove extending in the circumferential direction, which is used for guiding the clutch pin to slide into the second groove in the circumferential direction.

8. An aircraft-mounted, air-cooled gear case assembly as recited in claim 6 wherein, The airflow heat dissipation path of the gear box comprises: the gear box inner cavity→the first rolling bearing (3)→the first fan wheel (5) inlet hole→the second fan blade (62)→the first fan blade (53)→the outlet hole (74).

9. An aircraft-mounted, air-cooled gear case assembly as recited in claim 6 wherein, The airflow backflow path of the heat dissipation fan comprises backflow path one: the first gap (G1)→the communication hole (55)→the second gap (G2)→the second rolling bearing (9)→the backflow cavity (64)→the drainage hole (66)→the fan flow channel between the adjacent two second fan blades.

10. An aircraft-mounted, air-cooled type gear box assembly as claimed in claim 9, wherein, The airflow backflow path of the heat dissipation fan further comprises backflow path two: the airflow space between the second fan blade and the first fan blade→the second gap→the second rolling bearing→the backflow cavity→the drainage hole→the fan flow channel between the adjacent two second fan blades.

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