CN212775401U

CN212775401U - High-speed heavy-load multi-shaft speed change gear box

Info

Publication number: CN212775401U
Application number: CN202021758965.4U
Authority: CN
Inventors: 何誉川; 张军楷; 江师露; 薛晓东
Original assignee: Chongqing Yong Jin Heavy Machinery Complete Equipment Co ltd
Current assignee: Chongqing Yong Jin Heavy Machinery Complete Equipment Co ltd
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2021-03-23
Anticipated expiration: 2030-08-21

Abstract

The utility model relates to a high-speed heavy-load multi-shaft speed change gear box, which comprises a box body; a first input shaft, a second input shaft and a third input shaft are arranged in the box body; a first gear is arranged in the first input shaft; a first gear and a second gear are arranged in the second input shaft; a third gear is arranged on the third input shaft; the first gear is meshed with the first input shaft, and the output end of the first input shaft is in speed reduction output; the third gear is meshed with the second gear; the third gear is meshed with the second gear. Its advantages are: the utility model discloses a high-speed heavy load multiaxis change gear case has satisfied the requirement of motor loading test high speed, heavy load, multiaxis input, and reasonable selection bearing and transmission structure, through optimal design, complete machine compact structure, small, light in weight. And the service life problem of the rolling bearing under the high rotating speed and the problem of heat generation inside the gear box are solved.

Description

High-speed heavy-load multi-shaft speed change gear box

Technical Field

The utility model belongs to the technical field of the gear box technique and specifically relates to a high-speed heavy load multiaxis change speed gear box.

Background

Because the rotating speed requirements of all the transmission equipment are different, a speed reducer needs to be additionally arranged to adjust the rotating speed so as to achieve the purpose of speed matching, and the gear box can adjust the rotating speed, so that the structural design of the gear box becomes the key point for industry attention. The existing gear box has two types, namely a high-speed gear box and a low-speed gear box, and the structural design of the high-speed gear box is particularly important because the existing high-rotation-speed driving equipment is more.

However, the following drawbacks and disadvantages exist with respect to a transmission gearbox applied to a high-speed heavy-duty motor test stand:

firstly, high-speed heavy load, the gear box working condition that the motor test bench requires has the characteristics of high-speed heavy load impact load, and the soft tooth surface speed reducer that this industry applied more has low bearing capacity, low transmission efficiency, bulky, weight height.

Secondly, the structural arrangement of the existing gear box does not meet the test requirements of the test bed on three tested motors with different models when being applied to the test bed of the high-speed heavy-load motor, and the production cost of the test unit is greatly increased.

In addition, the speed change gear box for the high-speed heavy-load motor test bed is a multi-shaft input gear box and has the severe working conditions of high rotating speed, large torque and large impact, so that the gear box has the technical difficulties of complex structure, poor load balancing effect, poor lubricating effect and the like.

Chinese patent document CN201621336663.1, application date 20161207, with patent names: a high-speed gear box comprises a box body, a transmission structure, a bearing, a detection device and a lubricating device; the utility model has the advantages that the herringbone gear in the transmission structure is matched with the input shaft and the output shaft, the large gear is in non-key interference fit with the output shaft, the small gear and the input shaft are integrally arranged and integrally float in the box body, the small gear can automatically find the best stress state, automatic centering is realized, uniform load is guaranteed, the axial positioning and stress of the system can be met by only one bearing with a bidirectional axial thrust surface, and the structure is simpler; temperature measuring resistors are arranged in the bearings and are connected with external equipment through cables, a reasonable detection device is provided, equipment faults are prevented, and safety is improved; by arranging the multilayer oil throwing structure and the oil return channel, the sealing performance is improved, and the leakage of oil is effectively prevented; and through setting up two-way fueling injection equipment, guaranteed the sufficiency of gear lubrication and cooling. However, a technical scheme which has a good bearing effect, meets the test requirements and has a good lubricating effect is not disclosed correspondingly.

In summary, a high-speed heavy-load multi-shaft speed change gear box with good bearing effect, good lubricating effect and good test requirement is needed. No report is currently made about such a transmission.

Disclosure of Invention

The utility model aims at providing a bearing effect is good, satisfies the test requirement, lubricated effectual high-speed heavy load multiaxis change speed gear case.

In order to achieve the purpose, the utility model adopts the technical proposal that:

a high-speed heavy-duty multi-shaft speed change gearbox comprises a box body; a first input shaft, a second input shaft and a third input shaft are arranged in the box body; a first gear is arranged in the first input shaft; a first gear and a second gear are arranged in the second input shaft; a third gear is arranged on the third input shaft; the first gear is meshed with the first input shaft, and the output end of the first input shaft is in speed reduction output; the output end of the second input shaft has a coaxial speed ratio of 1:1, outputting; the third gear is meshed with the second gear; and the output end of the third input shaft outputs in a coaxial speed ratio of 1: 1.

As a preferable technical scheme, a bearing is arranged at the joint of the first input shaft and the box body; the bearing is provided with a pre-tightening spring; the bearing size precision is P4 grade, and the running precision is P2 grade.

As a preferable technical scheme, the whole speed change gear box adopts a horizontal and vertical structural arrangement.

Preferably, the first gear, the second gear and the third gear are designed to increase the axial contact ratio by increasing the helix angle and the tooth width.

As a preferable technical scheme, the first gear, the second gear and the third gear are designed to carry out gear trimming and trimming by accurately calculating the thermal deformation of the gears and the bending and twisting deformation of the transmission shaft.

As a preferable technical scheme, the speed change gear box adopts forced lubrication, and an oil separation plate is designed below a gear meshing position.

As a preferred technical scheme, one end of the speed change gear box is connected with the dragging motor, the other end of the speed change gear box is connected with the tested motor, and the speed change gear box is also provided with a torque and rotating speed sensor.

As a preferable technical scheme, the first input shaft and the first gear are meshed to realize the speed reduction output of the speed ratio 5: 1.

As a preferred technical scheme, the speed change gear box further comprises a rare station oil tank and an oil inlet flange; the box body is also provided with a screw hole and an oil spraying pipe.

As a preferable technical scheme, the gear box is further provided with output shafts, and the number of the output shafts is one.

The utility model has the advantages that:

1. the utility model discloses a high-speed heavy load multiaxis change gear case has satisfied the requirement of motor loading test high speed, heavy load, multiaxis input, and reasonable selection bearing and transmission structure, through optimal design, complete machine compact structure, small, light in weight. And the service life problem of the rolling bearing under the high rotating speed and the problem of heat generation inside the gear box are solved.

2. The gear box innovatively adopts a horizontal and vertical structural arrangement, so that the test requirements of the test bed on tested motors of three different models can be met simultaneously, and the production cost of the test unit is greatly reduced.

3. In the running process of the gear box, lubricating oil in the thin oil station is conveyed to the gear box through the oil inlet flange, the lubricating oil is conveyed to each lubricating point through the threaded hole in the box body and the oil spraying pipe so as to ensure that the bearings and the gears are fully lubricated, and the lubricated oil flows back to the oil tank in the thin oil station through the oil return flange, so that the lubricating effect is good.

Drawings

Fig. 1 is a schematic structural view of a high-speed heavy-load multi-shaft speed change gear box of the present invention.

Fig. 2 is a schematic side view of the structure of fig. 1.

Fig. 3 is a simple and easy schematic view of the assembly of the speed change gear box of the present invention.

Fig. 4 is a schematic view of a use state of the transmission gear box of the present invention.

Detailed Description

The invention will be further described with reference to the following examples and with reference to the accompanying drawings.

The reference numerals and components referred to in the drawings are as follows:

1. first input shaft 2. second input shaft

3. Third input shaft 4. case body

5. First gear 6. second gear

7. Third gear 8. bearing

9. Pre-tightening spring 10. output shaft

11. Dragging motor 12. tested motor

Referring to fig. 1 and 2, fig. 1 is a schematic structural view of a high-speed heavy-duty multi-shaft transmission gear box according to the present invention. Fig. 2 is a schematic side view of the structure of fig. 1. A high-speed heavy-duty multi-shaft speed change gearbox comprises a box body 4; a first input shaft 1, a second input shaft 2 and a third input shaft 3 are arranged in the box body 4; a first gear 5 is arranged in the first input shaft 1; a first gear 5 and a second gear 6 are arranged in the second input shaft 2; a third gear 7 is arranged on the third input shaft 3; the first gear 5 is meshed with the first input shaft 1, and the output end of the first input shaft 1 is in speed reduction output; the output end of the second input shaft 2 is coaxial speed ratio output; the third gear 7 is meshed with the second gear 6; and the output end of the third input shaft 3 is coaxial speed ratio output.

A bearing 8 is arranged at the joint of the first input shaft 1 and the box body 4; the bearing 8 is provided with a pre-tightening spring 9; the size precision of the bearing 8 is P4 grade, and the running precision is P2 grade. The whole speed change gear box adopts a horizontal and vertical structure arrangement.

The first gear 5, the second gear 6 and the third gear 7 are designed to increase the axial overlap ratio by increasing the helix angle and the tooth width. The first gear 5, the second gear 6 and the third gear 7 are designed to carry out gear edge trimming and direction correction by accurately calculating the thermal deformation of the gears and the bending deformation of the transmission shaft; the speed change gear box adopts forced lubrication, and an oil separation plate is designed below a gear meshing position.

The first input shaft 1 is meshed with the first gear 5 to realize speed reduction output with the speed ratio of 5: 1; the change gear box also comprises a rare station oil tank and an oil inlet flange; the box body is also provided with a screw hole and an oil spraying pipe.

Referring to fig. 3, fig. 3 is a simplified assembly diagram of the transmission gear box of the present invention. The gearbox is also provided with output shafts 10, and there is only one output shaft 10.

Referring to fig. 4, fig. 4 is a schematic view illustrating a use state of the transmission gear box of the present invention. One end of the speed change gear box is connected with the dragging motor 11, the other end of the speed change gear box is connected with the tested motor 12, and the speed change gear box is also provided with a torque and rotating speed sensor.

The embodiment needs to be explained as follows:

the first gear 5 is meshed with the first input shaft 1, and the output end of the first input shaft 1 is in speed reduction output; the output end of the second input shaft 2 has a coaxial speed ratio of 1:1, outputting; the third gear 7 is meshed with the second gear 6; and the output end of the third input shaft 3 is coaxial output with the speed ratio of 1: 1. The effect of this design is: can accurately test the parameters and the transmission form requirements of the rotating speed and the torque of the tested motor 12, adopts a two-stage hard tooth surface parallel shaft transmission structure, has the characteristics of high bearing capacity, high transmission efficiency, small volume and light weight,

the gear box innovatively adopts a horizontal and vertical structural arrangement, so that the test requirements of the test bed on three tested motors 12 of different models can be met, and the production cost of the test unit is greatly reduced.

The first input shaft 1 with the rotation speed of 8000rpm selects the ultra-precise bearing 8, the dimensional accuracy of the bearing 8 is P4 grade, the operation accuracy is P2 grade, and the spring is configured to ensure proper pretightening force during installation so as to prolong the service life and the rotation speed of the bearing 8.

The first gear 5, the second gear 6 and the third gear 7 are designed to increase the axial overlap ratio by increasing the helix angle and the tooth width. The design mode can improve the transmission stability.

And the first gear 5, the second gear 6 and the third gear 7 are subjected to gear trimming and direction correction by accurately calculating the thermal deformation of the gears and the bending and twisting deformation of the transmission shaft during design. The design mode can reduce the meshing impact; the tooth direction precision of the gear is improved, so that the tooth direction load distribution coefficient is reduced.

The speed change gear box adopts forced lubrication, and an oil separation plate is designed below a gear meshing position. The effect of this design is: excessive oil stirring generated when the gears are meshed at high speed is avoided, so that the heat generated in the gear box is reduced, and the generated oil mist is reduced.

One end of the speed change gear box is connected with the dragging motor 11, the other end of the speed change gear box is connected with the tested motor 12, and the speed change gear box is also provided with a torque and rotating speed sensor. A variable speed test unit is formed in this way, so that the variable speed gear box can be used for a motor speed changing device of a high-speed heavy-load motor test bed, and during test, the driving motor 11 drives the variable speed gear box through a torque and rotation speed sensor to load a test motor, so that the accurate test of the high-speed heavy-load motor test bed on the rotation speed and the torque of a tested motor 12 is met.

The first input shaft 1 is meshed with the first gear 5 to realize speed reduction output with the speed ratio of 5: 1. The effect of this design is: the first input shaft 1 is decelerated, and the transmission and load balancing effects are good at the speed ratio.

The change gear box also comprises a rare station oil tank and an oil inlet flange; the box body is also provided with a screw hole and an oil spraying pipe. In the running process of the gear box, lubricating oil of the thin oil station is conveyed to the gear box through the oil inlet flange, the lubricating oil is conveyed to each lubricating point through the threaded hole in the box body and the oil spraying pipe so as to ensure that the bearing 8 and the gear are fully lubricated, and the lubricated oil flows back to the oil tank of the thin oil station through the oil return flange, so that the lubricating effect is good.

The gearbox is also provided with output shafts 10, and there is only one output shaft 10. The effect of this design is: the output shaft 10 is matched with the first input shaft 1, the second input shaft 2 and the third input shaft 3, multi-shaft transmission and two-stage hard tooth surface parallel shaft transmission are achieved, and the dragging motor 11 can respectively load three tested motors 12 of different models through gear boxes so as to meet test requirements.

The utility model discloses a high-speed heavy load multiaxis change gear case has satisfied the requirement of motor loading test high speed, heavy load, multiaxis input, and reasonable selection bearing 8 and transmission structure, through optimal design, complete machine compact structure, small, light in weight. And the problem of the service life of the rolling bearing 8 at a high rotating speed and the problem of heat generation inside the gear box are solved.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and additions can be made without departing from the principles of the present invention, and these improvements and additions should also be regarded as the protection scope of the present invention.

Claims

1. A high-speed heavy-load multi-shaft speed change gearbox is characterized by comprising a gearbox body; a first input shaft, a second input shaft and a third input shaft are arranged in the box body; a first gear is arranged in the first input shaft; a first gear and a second gear are arranged in the second input shaft; a third gear is arranged on the third input shaft; the first gear is meshed with the first input shaft, and the output end of the first input shaft is in speed reduction output; the output end of the second input shaft has a coaxial speed ratio of 1:1, outputting; the third gear is meshed with the second gear; and the output end of the third input shaft outputs in a coaxial speed ratio of 1: 1.

2. The high-speed heavy-duty multi-shaft transmission gearbox according to claim 1, wherein a bearing is provided at a connection of said first input shaft and said gearbox body; the bearing is provided with a pre-tightening spring; the bearing size precision is P4 grade, and the running precision is P2 grade.

3. The high speed, heavy duty, multi-axis change speed gearbox of claim 1, wherein said change speed gearbox is arranged in a horizontal plus vertical configuration throughout.

4. The high speed, heavy duty, multi-axis change speed gearbox of claim 1, wherein said first, second and third gears are designed to increase axial overlap by increasing helix angle and tooth width.

5. The high speed, heavy duty, multi-axis change speed gearbox of claim 1, wherein said first, second, and third gears are designed for gear trimming by precisely calculating gear thermal distortion and drive shaft torsional distortion.

6. The high speed, heavy duty, multi-shaft transmission gearbox of claim 1, wherein said transmission gearbox utilizes forced lubrication and oil barriers are designed below the gear mesh locations.

7. The high-speed heavy-load multi-shaft speed change gearbox according to claim 1, wherein one end of the speed change gearbox is connected with a dragging motor, the other end of the speed change gearbox is connected with a tested motor, and the speed change gearbox is further provided with a torque and rotation speed sensor.

8. The high speed, heavy duty, multi-axis change speed gearbox of claim 1, wherein said first input shaft and first gear mesh to achieve a 5:1 speed reduction output.

9. The high speed, heavy duty, multi-axis change speed gearbox of claim 1, wherein said change speed gearbox further comprises a rare station fuel tank and a fuel inlet flange; the box body is also provided with a screw hole and an oil spraying pipe.

10. A high speed, heavy duty, multi-axis change speed gearbox according to claim 1, wherein said change speed gearbox is further provided with output shafts, and there is only one output shaft.