Coaxial gearbox for 50,000-turn pure rolling bearing

Abstract

The utility model provides a 50,000 revolutions pure rolling bearing coaxial gearbox, which relates to the technical field of gearboxes and comprises a bottom plate, a box body is mounted on the upper surface of the bottom plate, first bearing seats are mounted on two sides of the interior of the box body, a second bearing seat is further mounted in the middle of the interior of the box body, and the second bearing seat is mounted in the box body. Wherein a low-speed shaft is installed between one first bearing seat and the second bearing seat, a high-speed shaft is installed between the other first bearing seat and the second bearing seat, and an intermediate shaft is further installed on one side of the second bearing seat. The first bearing seats on the two sides of the interior of the box body and the second bearing seat in the middle are all of an integral structure and are directly connected with the bottom plate, the integral rigidity of the gearbox can be effectively improved, stability is higher, the service life is longer, oil ways needed by bearing lubrication are arranged in the bearing seats in a punching mode, and the service life of the gearbox is prolonged. The problem that pipelines cannot be machined and installed due to the complex and narrow internal space structure of the box body is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gear boxes, in particular to a 50,000-rpm pure rolling bearing coaxial gear box. Background Art

[0002] A gearbox is a common mechanical transmission component, often used to accelerate or decelerate speed. In aviation test benches, a speed-increasing gearbox is required, such as the gearbox proposed in patent application number 202211183071.0. The gearbox includes: a housing; a motor, which is arranged on one side of the housing, and the motor's rotor portion extends into the housing; an input shaft, which is arranged inside the housing near the motor and connected to the motor's rotor; a first gear, which is a helical gear, is also provided on the input shaft; an intermediate shaft, which is arranged inside the housing and spaced apart from the input shaft, and a second gear, which meshes with the first gear, is provided on the intermediate shaft; an output shaft, which is arranged on the side of the housing away from the input shaft, and a third gear, which meshes with the second gear, is provided on the output shaft; wherein the motor drives the input shaft and the first gear to rotate simultaneously; the first gear drives the second gear and the intermediate shaft to rotate; and the second gear drives the third gear and the output shaft to rotate.

[0003] Due to the special installation method of the aviation test bench, the input shaft and output shaft of the gearbox are required to be in the same straight line. The existing gearbox is large in overall size and cannot meet the special installation method of the aviation test bench gearbox. It is also unable to achieve coaxial output. In addition, the gearbox has poor rigidity, is easily damaged, and has a short service life. Therefore, we have made improvements to this and proposed a 50,000 rpm pure rolling bearing coaxial gearbox. Utility Model Content

[0004] The main purpose of this utility model is to provide a 50,000-rpm pure rolling bearing coaxial gearbox, which can effectively solve the problems of the gearbox's overall size being large and unable to meet the special installation method of the aviation test bench gearbox, and the inability to achieve coaxial output, and the gearbox's poor rigidity, easy damage, and short service life.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A 50,000-rpm pure rolling bearing coaxial gearbox includes a base plate, a box body is installed on the upper surface of the base plate, first bearing seats are installed on both sides of the interior of the box body, and a second bearing seat is also installed at the middle position inside the box body. A low-speed shaft is installed between one of the first bearing seats and the second bearing seat, and a high-speed shaft is installed between the other first bearing seat and the second bearing seat. An intermediate shaft is also installed on one side of the second bearing seat.

[0007] Preferably, a first driving transmission gear is fixedly mounted on the shaft body of the low-speed shaft, and a first driven transmission gear is fixedly mounted on one side shaft of the intermediate shaft, and the first driving transmission gear and the first driven transmission gear are meshed with each other.

[0008] Preferably, a second driving transmission gear is fixedly mounted on one side of the intermediate shaft, and a second driven transmission gear is fixedly mounted on the shaft of the high-speed shaft, and the second driven transmission gear and the second driving transmission gear are meshed with each other.

[0009] Preferably, the bottom of each of the first bearing seat and the second bearing seat is fixedly mounted on the upper surface of the base plate.

[0010] Preferably, spherical roller bearings are installed at both ends of the low-speed shaft, and the two spherical roller bearings are installed inside the first bearing seat and the second bearing seat respectively.

[0011] Preferably, a cylindrical roller bearing is installed at one end of the intermediate shaft, and the cylindrical roller bearing is installed inside one of the first bearing seats. A four-point angular contact ball bearing is installed at the other end of the intermediate shaft, and the four-point angular contact ball bearing is installed inside the other first bearing seat.

[0012] Preferably, ultra-precision bearings are installed at both ends of the high-speed shaft, a bearing sleeve is provided on the outside of each ultra-precision bearing, and two bearing sleeves are respectively provided inside the first bearing seat and the second bearing seat.

[0013] Preferably, oil baffles are provided inside the box and on both sides of the high-speed shaft.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The first bearing seats on both sides of the box and the second bearing seat in the middle both adopt an integral structure and are directly connected to the base plate, which can effectively increase the overall rigidity of the gearbox, provide higher stability and longer service life. The oil circuits required for bearing lubrication are arranged by drilling holes in the bearing seats, avoiding the problem of being unable to process and install pipelines due to the complex and narrow space structure inside the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a side view of the utility model;

[0017] Figure 2 It is a top view of the utility model.

[0018] In the figure: 1. Base plate; 2. Housing; 3. First bearing seat; 4. Second bearing seat; 5. Low-speed shaft; 501. First driving transmission gear; 6. Intermediate shaft; 601. First driven transmission gear; 602. Second driving transmission gear; 7. High-speed shaft; 701. Second driven transmission gear; 8. Spherical roller bearing; 9. Cylindrical roller bearing; 10. Four-point angular contact ball bearing; 11. Oil deflector; 12. Super-precision bearing; 13. Bearing sleeve. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] like Figure 1 、 Figure 2 As shown, a 50,000-rpm pure rolling bearing coaxial gearbox includes a base plate 1, a box body 2 is installed on the upper surface of the base plate 1, first bearing seats 3 are installed on both sides of the interior of the box body 2, and a second bearing seat 4 is also installed at the middle position inside the box body 2. A low-speed shaft 5 is installed between one of the first bearing seats 3 and the second bearing seat 4, a high-speed shaft 7 is installed between the other first bearing seat 3 and the second bearing seat 4, and an intermediate shaft 6 is also installed on one side of the second bearing seat 4.

[0021] like Figure 2 As shown, a first driving transmission gear 501 is fixedly mounted on the shaft body of the low-speed shaft 5, a first driven transmission gear 601 is fixedly mounted on one side shaft of the intermediate shaft 6, the first driving transmission gear 501 and the first driven transmission gear 601 are meshed with each other, a second driving transmission gear 602 is fixedly mounted on one side shaft body of the intermediate shaft 6, a second driven transmission gear 701 is fixedly mounted on the shaft body of the high-speed shaft 7, the second driven transmission gear 701 and the second driving transmission gear 602 are meshed with each other, and the bottom of each of the first bearing seat 3 and the second bearing seat 4 is fixedly mounted on the upper surface of the base plate 1.

[0022] The increase in rotational speed is achieved through the meshing transmission between the first active transmission gear 501 and the first driven transmission gear 601, and between the second active transmission gear 602 and the second driven transmission gear 701. The bottoms of the first bearing seat 3 and the second bearing seat 4 are directly connected to the bottom plate 1, which can increase the overall stability of the box body 2 and is not easily damaged during use.

[0023] like Figure 2As shown, spherical roller bearings 8 are installed at both ends of the low-speed shaft 5, and the two spherical roller bearings 8 are respectively installed inside the first bearing seat 3 and the second bearing seat 4; a cylindrical roller bearing 9 is installed at one end of the intermediate shaft 6, and the cylindrical roller bearing 9 is installed inside one of the first bearing seats 3; a four-point angular contact ball bearing 10 is installed at the other end of the intermediate shaft 6, and the four-point angular contact ball bearing 10 is installed inside the other first bearing seat 3; super-precision bearings 12 are installed at both ends of the high-speed shaft 7, and a bearing sleeve 13 is provided on the outside of each super-precision bearing 12, and the two bearing sleeves 13 are respectively provided inside the first bearing seat 3 and the second bearing seat 4; oil baffles 11 are provided inside the box body 2 and on both sides of the high-speed shaft 7.

[0024] The high-speed shaft 7 uses ultra-precision bearings 12 and is installed using bearing sleeves 13 to ensure that each bearing can receive the preload force of the spring, so that the bearing preload force is fully operational and the critical speed of the rotor of the entire high-speed shaft 7 is greatly increased. The intermediate shaft 6 uses cylindrical roller bearings 9 and four-point angular contact ball bearings 10, and the low-speed shaft 5 uses spherical roller bearings 8. The cost of the bearings can be minimized while meeting the requirements of the gearbox.

[0025] The working principle of a 50,000 rpm pure rolling bearing coaxial gearbox:

[0026] When the low-speed shaft 5 is connected to the power output and rotates, it will drive the first driving transmission gear 501 to rotate. Under the meshing transmission of the first driving transmission gear 501 and the first driven transmission gear 601, the intermediate shaft 6 can be driven to rotate, so that the second driving transmission gear 602 follows the rotation. Under the meshing transmission between the second driving transmission gear 602 and the second driven transmission gear 701, the high-speed shaft 7 can be driven to rotate. The low-speed shaft 5 and the high-speed shaft 7 are coaxially arranged to meet the requirements of the coaxial output of the aviation test bench. The first bearing seats 3 on both sides of the inside of the box 2 and the second bearing seat 4 in the middle are both of an integral structure and are directly connected to the base plate 1, which can effectively increase the overall rigidity of the gearbox, with higher stability and longer service life. The oil path required for bearing lubrication is arranged by drilling in the bearing seat to avoid the problem that the internal space structure of the box 2 is complex and narrow, resulting in the inability to process and install pipelines.

[0027] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A 50,000 rpm pure rolling bearing coaxial gearbox, comprising a base plate (1), characterized in that: A box body (2) is installed on the upper surface of the bottom plate (1), and first bearing seats (3) are installed on both sides of the interior of the box body (2). A second bearing seat (4) is also installed at the middle position of the interior of the box body (2), a low-speed shaft (5) is installed between one of the first bearing seats (3) and the second bearing seat (4), a high-speed shaft (7) is installed between the other first bearing seat (3) and the second bearing seat (4), and an intermediate shaft (6) is also installed on one side of the second bearing seat (4).

2. The 50,000 rpm pure rolling bearing coaxial gearbox according to claim 1, characterized in that: A first driving transmission gear (501) is fixedly mounted on the shaft of the low-speed shaft (5), and a first driven transmission gear (601) is fixedly mounted on one side shaft of the intermediate shaft (6), and the first driving transmission gear (501) and the first driven transmission gear (601) are meshed with each other.

3. The 50,000 rpm pure rolling bearing coaxial gearbox according to claim 1, characterized in that: A second driving transmission gear (602) is fixedly mounted on one side of the intermediate shaft (6), and a second driven transmission gear (701) is fixedly mounted on the shaft of the high-speed shaft (7), wherein the second driven transmission gear (701) and the second driving transmission gear (602) are meshed with each other.

4. The 50,000 rpm pure rolling bearing coaxial gearbox according to claim 1, characterized in that: The bottom of each of the first bearing seat (3) and the second bearing seat (4) is fixedly mounted on the upper surface of the base plate (1).

5. The 50,000 rpm pure rolling bearing coaxial gearbox according to claim 1, characterized in that: Both ends of the low-speed shaft (5) are equipped with spherical roller bearings (8), and the two spherical roller bearings (8) are respectively installed inside the first bearing seat (3) and the second bearing seat (4).

6. The 50,000 rpm pure rolling bearing coaxial gearbox according to claim 1, characterized in that: A cylindrical roller bearing (9) is mounted on one end of the intermediate shaft (6), and the cylindrical roller bearing (9) is mounted inside one of the first bearing seats (3). A four-point angular contact ball bearing (10) is mounted on the other end of the intermediate shaft (6), and the four-point angular contact ball bearing (10) is mounted inside the other first bearing seat (3).

7. The 50,000 rpm pure rolling bearing coaxial gearbox according to claim 1, characterized in that: Ultra-precision bearings (12) are installed at both ends of the high-speed shaft (7), and a bearing sleeve (13) is provided on the outside of each ultra-precision bearing (12). The two bearing sleeves (13) are respectively arranged inside the first bearing seat (3) and the second bearing seat (4).

8. The 50,000 rpm pure rolling bearing coaxial gearbox according to claim 1, characterized in that: Oil baffles (11) are provided inside the box (2) and on both sides of the high-speed shaft (7).

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