High-speed gearbox for test bed

Abstract

The utility model discloses a high-speed gear box for a test bed, which comprises a box body, a high-speed shaft and a low-speed shaft are arranged in the box body in parallel up and down, the high-speed shaft is rotatably connected with the box body through two tilting-pad sliding bearings, and the low-speed shaft is rotatably connected with the box body through two three-oil-vane sliding bearings; a driving gear is fixedly arranged in the middle of the low-speed shaft in a sleeved mode, a driven gear is fixedly arranged in the middle of the high-speed shaft in a sleeved mode, and the driven gear is meshed with the driving gear. The two sides of the driven gear are each provided with a thrust disc, and the two thrust discs are attached to the two sides of the driving gear respectively. And the opposite ends of the high-speed shaft and the low-speed shaft extend out of the box body. The transmission is simple and compact in structure, high in stability, large in transmission ratio, capable of outputting higher rotating speed, high in axial bearing capacity, capable of achieving forward and reverse rotation bidirectional output and high in applicability.

Description

Technical Field

[0001] The utility model relates to the technical field of gear boxes, in particular to a high-speed gear box for a test bench. Background Art

[0002] With the development of the national economy and technological advancement, high-speed gear transmissions are increasingly being used in aviation, rail transportation, petroleum, chemical engineering, metallurgy, and other fields. Currently, high-speed gearboxes, such as those used in aviation test benches, are primarily imported. Currently, high-speed gearboxes for test benches, particularly those used in aviation test benches, mostly utilize a horizontal parallel-stage structure. However, this type of gearbox has a low output speed, with gear pitch linear speeds less than 100 m / s, and can withstand relatively low axial loads, making it unable to meet the high-speed gearbox requirements of test benches.

[0003] In order to resolve these contradictions and deficiencies and improve domestic high-speed gearbox technology, it is urgent to design a high-speed gearbox for a test bench. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problems of low output speed, small axial load, high cost and poor stability of the existing test bench gearbox, and to provide a high-speed gearbox for the test bench with a simple and compact structure, high stability, large transmission ratio, higher output speed, strong axial load-bearing capacity and the ability to achieve forward and reverse rotation bidirectional output, and greater applicability.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a high-speed gearbox for a test bench, including a box body, characterized in that a high-speed shaft and a low-speed shaft are arranged side by side in the box body, and the axis lines of the high-speed shaft and the low-speed shaft are parallel; wherein the high-speed shaft is rotatably connected to the box body through two tilting pad sliding bearings, and the low-speed shaft is rotatably connected to the box body through two or three oil leaf sliding bearings; a driving gear is sleeved and fixed in the middle of the low-speed shaft, and a driven gear is sleeved and fixed in the middle of the high-speed shaft, and the driven gear is sleeved and fixed in the middle of the high-speed shaft. The wheel is engaged with the driving gear, and the tooth diameter of the driving gear is larger than the tooth diameter of the driven gear, and the transmission ratio of the driving gear to the driven gear is 6-8; a thrust plate is provided on both sides of the driven gear, and the thrust plate is sleeved and fixed on the high-speed shaft. The diameter of the thrust plate is larger than the tooth diameter of the driven gear, and the two thrust plates are respectively fitted with both sides of the driving gear; the ends of the high-speed shaft and the low-speed shaft facing away from each other extend out of the box body, an input flange is sleeved on the end of the low-speed shaft extending out of the box body, and an output flange is sleeved on the end of the high-speed shaft extending out of the box body.

[0006] Furthermore, the driving gear and the driven gear are both helical gears.

[0007] Furthermore, the driven gear and the high-speed shaft are formed as one body.

[0008] Furthermore, the transmission ratio between the driving gear and the driven gear is 6.97.

[0009] Furthermore, the box body includes an upper box body, a middle box body and a lower box body, all of which have rectangular cross-sections. The upper box body, the middle box body and the lower box body are connected in sequence by flanges and bolts; a high-speed shaft hole is opened at the connection between the upper box body and the middle box body, and a low-speed shaft hole is opened at the connection between the middle box body and the lower box body. The high-speed shaft is installed in the high-speed shaft hole, and the low-speed shaft is installed in the low-speed shaft hole.

[0010] Furthermore, the tilting pad sliding bearing is installed in the high-speed shaft hole, and the three-oil lobe sliding bearing is installed in the low-speed shaft hole.

[0011] Furthermore, a sealing end cover is provided on one end of the high-speed shaft and the low-speed shaft extending out of the box body, and the sealing end cover is fixedly connected to the box body; a blind cover is provided at the position corresponding to the shaft hole on the side of the box body away from the sealing end cover, and the blind cover is fixedly connected to the box body and closes the first shaft hole and the second shaft hole accordingly.

[0012] Compared with the existing technology, the utility model has the following advantages: simple and compact structure, higher stability; the axial force of the high-speed shaft is transmitted to the driving gear through the thrust plate, and then transmitted to the box through the low-speed shaft, thereby making the gear transmission system more stable; the transmission ratio is large, the output speed can be higher, the axial load-bearing capacity is strong, and the bidirectional axial force can be unloaded, thereby realizing forward and reverse rotation bidirectional output, and greater applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model.

[0014] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0015] In the figure: 1—upper housing, 2—middle housing, 3—lower housing, 4—high-speed shaft, 5—low-speed shaft, 6—tilt pad sliding bearing, 7—three-oil lobe sliding bearing, 8—driving gear, 9—driven gear, 10—thrust plate, 11—sealing end cover, 12—blind cover. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not require further definition or explanation in subsequent figures. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the figures, or the orientations or positional relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and are therefore not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and are not to be construed as indicating or implying relative importance. Furthermore, terms such as "horizontal" and "vertical" do not imply that a component must be absolutely horizontal or overhanging, but rather may be slightly tilted. For example, "horizontal" simply refers to a direction that is more horizontal than "vertical," and does not imply that the structure must be completely horizontal, but rather may be slightly tilted. In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0019] Example: See Figure 1 A high-speed gearbox for a test bench includes a box body, which includes an upper box body 1, a middle box body 2 and a lower box body 3, all of which have rectangular cross sections. The upper box body 1, the middle box body 2 and the lower box body 3 are connected in sequence by flanges and bolts.

[0020] A high-speed shaft 4 and a low-speed shaft 5 are arranged side by side in the housing, with their axis lines parallel. The high-speed shaft 4 is positioned above the low-speed shaft 5. The high-speed shaft 4 is rotatably connected to the housing via two tilting-pad sliding bearings 6, while the low-speed shaft 5 is rotatably connected to the housing via two three-lobe sliding bearings 7. Both the tilting-pad sliding bearings 6 and the three-lobe sliding bearings 7 are well-established existing technologies. Specifically, the tilting-pad sliding bearings 6 and the three-lobe sliding bearings 7 are connected to the high-speed shaft 4 and the low-speed shaft 5, respectively, through an interference fit. In practice, a hole for the high-speed shaft 4 is defined at the junction of the upper housing 1 and the middle housing 2, and a hole for the low-speed shaft 5 is defined at the junction of the middle housing 2 and the lower housing 3. The high-speed shaft 4 is installed in the hole in the high-speed shaft 4, while the low-speed shaft 5 is installed in the hole in the low-speed shaft 5. In practice, the tilting-pad sliding bearings 6 are installed in the hole in the high-speed shaft 4, while the three-lobe sliding bearings 7 are installed in the hole in the low-speed shaft 5.

[0021] A driving gear 8 is sleeved and fixed on the middle part of the low-speed shaft 5, and a driven gear 9 is sleeved and fixed on the middle part of the high-speed shaft 4; the driving gear 8 and the driven gear 9 are both helical gears and mesh together, and the tooth diameter of the driving gear 8 is larger than the tooth diameter of the driven gear 9. The transmission ratio of the driving gear 8 to the driven gear 9 is 6-8. Preferably, the transmission ratio of the driving gear 8 to the driven gear 9 is 6.97. During implementation, the driving gear 8 is connected to the driven shaft by an interference fit. During the processing, the driven gear 9 and the high-speed shaft 4 are formed into one piece, so that the relative position of the driven gear 9 and the high-speed shaft 4 can be ensured, thereby further improving the stability of the transmission system.

[0022] A thrust plate 10 is provided on each side of the driven gear 9. The thrust plates 10 are sleeved and fixed on the high-speed shaft 4. The diameter of the thrust plates 10 is larger than the tooth diameter of the driven gear 9, and the two thrust plates 10 are respectively fitted on both sides of the driving gear 8. In this way, the axial force generated by the driven gear 9 is transmitted by the thrust plates 10 to the driving gear 8 and the low-speed shaft 5, and then the thrust surface of the end face of the three-oil-lobe sliding bearing 7 unloads the axial force to the housing.

[0023] The high-speed shaft 4 and low-speed shaft 5 extend out of the housing at opposite ends. An input flange is mounted on the end of the low-speed shaft 5 extending out of the housing, and an output flange is mounted on the end of the high-speed shaft 4 extending out of the housing. The input flange is connected to the low-speed shaft 5 via a key, and the output flange is connected to the high-speed shaft 4 via an interference fit. A sealing end cap 11 is mounted on the ends of the high-speed shaft 4 and low-speed shaft 5 extending out of the housing. The sealing end cap 11 is fixedly connected to the housing. A blind cap 12 is mounted on the side of the housing facing away from the sealing end cap 11, corresponding to the axial hole. The blind cap 12 is fixedly connected to the housing and seals the first and second axial holes, respectively.

[0024] During operation, the motor drives the low-speed shaft 5 to rotate through the input flange, and the driving gear 8 drives the high-speed shaft 4 to rotate through the driven gear 9, thereby reducing the torque and increasing the speed; the axial force generated by the driven gear 9 is transmitted to the driving gear 8 and the low-speed shaft 5 by the thrust plate 10, and then the thrust surface of the end face of the three-oil-lobe sliding bearing 7 unloads the axial force to the box; finally, the load is output by the output flange.

[0025] This solution utilizes a single-stage helical parallel vertical transmission structure, resulting in a more compact structure. The low-speed shaft 5 is connected to the housing via a three-oil pad sliding bearing, while the high-speed shaft 4 is connected to the housing via a tilting pad sliding bearing 6, significantly improving high-speed transmission stability. The axial force of the high-speed shaft 4 is transmitted to the driving gear 8 via the thrust plate 10, and then to the housing via the low-speed shaft 5, thereby enhancing the stability of the gear transmission system. The high transmission ratio enables higher output speeds, strong axial load capacity, and the ability to unload bidirectional axial forces, thus achieving forward and reverse rotation output and enhancing applicability.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Ordinary technicians in this field should understand that those modifications or equivalent replacements of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A high-speed gearbox for a test bench, comprising a housing, characterized in that: A high-speed shaft and a low-speed shaft are arranged side by side in the upper and lower parts of the casing, and the axis lines of the high-speed shaft and the low-speed shaft are parallel; wherein, the high-speed shaft is rotatably connected to the casing through two tilting pad sliding bearings, and the low-speed shaft is rotatably connected to the casing through two or three oil-leaf sliding bearings; a driving gear is sleeved and fixed on the middle part of the low-speed shaft, and a driven gear is sleeved and fixed on the middle part of the high-speed shaft, the driven gear is meshed with the driving gear, and the tooth diameter of the driving gear is larger than the tooth diameter of the driven gear, and the transmission ratio of the driving gear to the driven gear is 6-8; a thrust plate is provided on both sides of the driven gear, the thrust plate is sleeved and fixed on the high-speed shaft, the diameter of the thrust plate is larger than the tooth diameter of the driven gear, and the two thrust plates are respectively fitted with both sides of the driving gear; the ends of the high-speed shaft and the low-speed shaft facing away from each other extend out of the casing, an input flange is sleeved on the end of the low-speed shaft extending out of the casing, and an output flange is sleeved on the end of the high-speed shaft extending out of the casing.

2. A high-speed gearbox for a test bench according to claim 1, characterized in that: The driving gear and the driven gear are both helical gears.

3. A high-speed gearbox for a test bench according to claim 1 or 2, characterized in that: The driven gear and the high-speed shaft are formed as one body.

4. A high-speed gearbox for a test bench according to claim 1, characterized in that: The transmission ratio between the driving gear and the driven gear is 6.

97.

5. The high-speed gearbox for a test bench according to claim 1, characterized in that: The box body includes an upper box body, a middle box body and a lower box body, all of which have rectangular cross-sections. The upper box body, the middle box body and the lower box body are connected in sequence by flanges and bolts. A high-speed shaft hole is opened at the connection between the upper box body and the middle box body, and a low-speed shaft hole is opened at the connection between the middle box body and the lower box body. The high-speed shaft is installed in the high-speed shaft hole, and the low-speed shaft is installed in the low-speed shaft hole.

6. The high-speed gearbox for a test bench according to claim 5, characterized in that: The tilting pad sliding bearing is installed in the high-speed shaft hole, and the three-oil lobe sliding bearing is installed in the low-speed shaft hole.

7. The high-speed gearbox for a test bench according to claim 1, characterized in that: A sealing end cover is provided on one end of the high-speed shaft and the low-speed shaft extending out of the box body, and the sealing end cover is fixedly connected to the box body; a blind cover is provided on the side of the box body away from the sealing end cover at the position corresponding to the shaft hole, and the blind cover is fixedly connected to the box body and closes the first shaft hole and the second shaft hole accordingly.

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