Gear box structure for screw pump

Abstract

The utility model discloses a gear box structure for a screw pump, which comprises a box body and an output shaft, the output shaft is arranged in the box body and penetrates through the box body, and the gear box structure further comprises a bearing assembly and a gear box, the two thrust cylindrical roller bearings are arranged on the output shaft and used for increasing the axial bearing capacity. The motor shaft is arranged in the box body and connected with the output shaft, and the motor shaft is further fixedly sleeved with a small gear; the middle gear shaft is meshed with the pinion through a middle gear and rotates synchronously with the motor shaft; and the gear is arranged outside the joint of the motor shaft and the output shaft in a sleeving manner. By arranging the two thrust cylindrical roller bearings, the axial bearing capacity is high, and the structure is compact; an input shaft and an output shaft of the whole machine are coaxial, so that the size of the gear box can be reduced to the maximum extent; the gear and the gear shaft are small in modulus and multiple in tooth number, the meshing contact ratio is increased, and therefore the service life of the gear is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of gear boxes, in particular to a gear box structure for a screw pump. Background Art

[0002] Existing products all use angular contact ball bearings to bear axial forces. Although the structure is simple and easy to assemble, the axial load bearing capacity is low, which cannot meet the product requirements and affects the service life of the gearbox. In order to improve the quality of screw pump products, the bearing bearing is improved to increase the service life of the whole machine. To ensure installation and disassembly, existing products all use a split-box structure, and at most the box body and flange are combined and divided into two halves. However, the split setting has poor rigidity, low strength, and is not easy to process, which also affects the accuracy.

[0003] To this end, the utility model provides a gear box structure for a screw pump to solve the above technical problems. Utility Model Content

[0004] Purpose of the utility model: to solve the problems mentioned in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A gear box structure for a screw pump, comprising a box body and an output shaft, wherein the output shaft is arranged inside the box body and passes through the box body, and further comprising:

[0007] A bearing assembly, the bearing assembly comprising: a deep groove ball bearing, a thrust cylindrical roller bearing and a spherical roller bearing, the bearings included in the bearing assembly are sleeved on the output shaft in sequence;

[0008] Two thrust cylindrical roller bearings are arranged on the output shaft to increase the axial bearing capacity;

[0009] A motor shaft, which is arranged inside the box and connected to the output shaft, and a pinion is fixedly sleeved on the motor shaft;

[0010] An intermediate gear shaft, wherein the intermediate gear shaft rotates synchronously with the motor shaft through meshing of the intermediate gear and the pinion gear;

[0011] The gear is sleeved outside the connection between the motor shaft and the output shaft.

[0012] Furthermore, the two thrust cylindrical roller bearings are arranged between the deep groove ball bearing and the spherical roller bearing, the deep groove ball bearing is arranged at an end away from the motor shaft, and the spherical roller bearing is arranged between the gear installation and the thrust cylindrical roller bearing.

[0013] Furthermore, an oil seal is provided on the box body, and the oil seal is used to seal the gap between the box body and the output shaft.

[0014] Furthermore, the gear, pinion and intermediate gear shaft adopt gears with small module and large number of teeth.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] By setting two thrust cylindrical roller bearings, the axial load-bearing capacity is strong and the structure is compact; the whole machine adopts coaxial input shaft and output shaft, which can minimize the size of the gearbox; the gears and gear shafts adopt small module and large number of teeth to increase the overlap of meshing, thereby greatly improving the service life of the gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] In the figure: 1. housing; 2. oil seal; 3. output shaft; 4. deep groove ball bearing; 5. thrust cylindrical roller bearing; 6. spherical roller bearing; 7. gear; 8. intermediate gear shaft; 9. intermediate gear; 10. pinion; 11. motor shaft. DETAILED DESCRIPTION

[0019] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0020] To this end, the applicant designed Figure 1 The gear box structure 7 for a screw pump shown in the figure includes a box body 1 and an output shaft 3, the output shaft 3 is arranged inside the box body 1 and passes through the box body 1, and also includes: a bearing assembly, the bearing assembly includes: a deep groove ball bearing 4, a thrust cylindrical roller bearing 5 and a spherical roller bearing 6, and the bearings included in the bearing assembly are sleeved on the output shaft 3 in sequence; two thrust cylindrical roller bearings 5 ​​are arranged on the output shaft 3 to increase the axial bearing capacity; a motor shaft 11, the motor shaft 11 is arranged inside the box body 1 and connected to the output shaft 3, and a pinion 10 is fixedly sleeved on the motor shaft 11; an intermediate gear shaft 8, the intermediate gear shaft 8 is meshed with the pinion 10 through the intermediate gear 9 and rotates synchronously with the motor shaft 11; a gear 7, the gear 7 is sleeved on the outside of the connection between the motor shaft 11 and the output shaft 3. The motor controls the motor shaft 11 and drives the output shaft 3 to output a constant torque M, and bears the axial force F. The coaxial arrangement of the input end and the output shaft 3 can minimize the volume of the gear box.

[0021] In this embodiment, two thrust cylindrical roller bearings 5 ​​are arranged between the deep groove ball bearing 4 and the spherical roller bearing 6. The deep groove ball bearing 4 is arranged at the end away from the installation motor shaft 11, and the spherical roller bearing 6 is arranged between the gear 7 installation and the thrust cylindrical roller bearing 5. Compared with the thrust cylindrical roller bearing 5, the ordinary tapered roller bearing, angular contact ball bearing, and double-row spherical roller bearing 6 have a smaller axial force bearing capacity. The thrust cylindrical roller bearing 5 can withstand a large axial load in a single direction. Since it has no automatic self-aligning capability, it is used in combination with the spherical roller bearing 6. The deep groove ball bearing 4, thrust cylindrical roller bearing 5 and spherical roller bearing 6 used in this application are all common in the prior art, so their structures will not be described in detail in this application.

[0022] In this embodiment, an oil seal 2 is further provided on the housing 1 , and the oil seal 2 is used to seal the gap between the housing 1 and the output shaft 3 .

[0023] In this embodiment, the gear 7, the pinion 10 and the intermediate gear shaft 8 use a gear 7 with a small module and a large number of teeth. In this application, the gear 7, the pinion 10 and the intermediate gear shaft 8 use a small module and a large number of teeth to increase the overlap of the meshing, thereby greatly improving the service life of the gear 7.

[0024] Working principle: In the prior art, the axial load bearing capacity of the gearbox during operation is low, which cannot meet the product requirements and affects the service life of the gearbox. The prior art usually adopts ordinary tapered roller bearings, angular contact ball bearings or double-row spherical roller bearings 6. Compared with the thrust cylindrical roller bearings 5, these three bearings have poorer ability to withstand axial forces. The thrust cylindrical roller bearings 5 ​​can withstand a large axial load in a single direction. Therefore, two cylindrical roller bearings are used to decompose the force. Since they do not have the function of automatic self-aligning, self-aligning roller bearings 6 are added for self-alignment, so that the bearing assembly can ensure a large bearing force while being able to align; the input shaft and output shaft 3 of the whole machine are coaxial, which can minimize the size of the gearbox.

[0025] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A gearbox structure for a screw pump, comprising a housing and an output shaft, wherein the output shaft is arranged inside the housing and passes through the housing, and is characterized in that: Also includes: A bearing assembly, the bearing assembly comprising: a deep groove ball bearing, a thrust cylindrical roller bearing and a spherical roller bearing, the bearings included in the bearing assembly are sleeved on the output shaft in sequence; Two thrust cylindrical roller bearings are arranged on the output shaft to increase the axial bearing capacity; A motor shaft, which is arranged inside the box and connected to the output shaft, and a pinion is fixedly sleeved on the motor shaft; An intermediate gear shaft, wherein the intermediate gear shaft rotates synchronously with the motor shaft through the meshing of the intermediate gear and the pinion gear; The gear is sleeved outside the connection between the motor shaft and the output shaft.

2. A gear box structure for a screw pump according to claim 1, characterized in that: The two thrust cylindrical roller bearings are arranged between the deep groove ball bearing and the spherical roller bearing, the deep groove ball bearing is arranged at one end away from the motor shaft, and the spherical roller bearing is arranged between the gear installation and the thrust cylindrical roller bearing.

3. A gear box structure for a screw pump according to claim 1, characterized in that: The box body is also provided with an oil seal, and the oil seal is used to seal the gap between the box body and the output shaft.

4. A gear box structure for a screw pump according to claim 1, characterized in that: The gears, pinions and intermediate gear shafts are gears with small modules and large numbers of teeth.

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