Anti-backlash box

Abstract

The utility model discloses an anti-backlash box, which relates to the technical field of machining equipment and comprises a box body, a power input shaft and power output shafts are arranged in the box body, a first helical gear is arranged on the first power output shaft, and a second helical gear is arranged on the second power output shaft. The power input shaft is located between the first power output shaft and the second power output shaft, the power input shaft is provided with a first transmission gear meshed with the first bevel gear, the end of the first power output shaft is provided with a first driving gear, and the end of the second power output shaft is provided with a second driving gear. The first driving gear and the second driving gear are engaged with the same rack; the first adjusting mechanism is used for adjusting the meshing gap between the first driving gear and the rack, and the second adjusting mechanism is used for adjusting the meshing gap between the second driving gear and the rack. Therefore, through the arrangement of the adjusting mechanism, the gap between the driving gear and the rack is adjusted in time, the machining precision is kept, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of machining equipment, in particular to a backlash eliminator box. Background Art

[0002] In the field of machining, large machine tools are increasingly widely used, and the machining accuracy requirements for large machine tools are also getting higher and higher. Large machine tools usually adopt ball screw structures or rack and pinion structures to achieve long-stroke transmission. These two transmission methods have their own advantages and disadvantages. Ball screw transmission needs to overcome the deformation influence of the screw caused by gravity, and rack and pinion transmission needs to overcome the influence of the gear transmission box on the transmission accuracy. On large machine tools with a stroke exceeding 6 meters, rack and pinion transmission is relatively more applied.

[0003] During the transmission process, due to the existence of machining errors or assembly errors, there is a backlash between the meshing gears and racks, resulting in transmission noise and affecting the machining accuracy of the machine tool. In solving the problem of the gear transmission box affecting the transmission accuracy, a double gear-rack transmission structure is often used to eliminate the backlash to ensure the transmission accuracy. The double gear-rack transmission structure relies on two sets of helical gear pairs with opposite helix directions for transmission. There is a power input shaft and two power output shafts installed on the transmission housing, and there is also an intermediate transition shaft between the power input shaft and each power output shaft. The power input shaft and the intermediate transition shaft are connected by a helical gear pair for transmission, and the power output shaft and the intermediate transition shaft are connected by a gear pair for transmission. Its structure is complex and the production and manufacturing cost is high.

[0004] In the prior art, there is a patent application document with a publication number of CN202674250U and a name of a walking backlash eliminator transmission box. In this document, the left-handed gear on the intermediate shaft meshes with the left transmission shaft, and the right-handed gear meshes with the right transmission shaft. By changing the position and pressure of the intermediate shaft, the meshing clearance between the gear and the rack is adjusted to ensure the machining accuracy. When this technology is used, since the adjusted intermediate shaft rotates at a high speed, it is a rigid adjustment, and the stability is poor, and the effect of maintaining the machining accuracy for a long time is not ideal. Summary of the Utility Model

[0005] To overcome the above defects, the purpose of the utility model is to provide a backlash eliminator box, which can timely adjust the clearance between the driving gear and the rack by setting an adjusting mechanism, maintain the machining accuracy, and extend the service life of the equipment.

[0006] To achieve the above object, the utility model provides a backlash elimination box, comprising: a box body, in which a power input shaft and a power output shaft are provided, and the power output shaft includes a first power output shaft and a second power output shaft; a first helical gear is provided on the first power output shaft, a second helical gear is provided on the second power output shaft, the power input shaft is located between the first power output shaft and the second power output shaft, the power input shaft is provided with a first transmission gear meshing with the first helical gear and a second transmission gear meshing with the second helical gear, and the inclination directions of the first helical gear and the second helical gear are opposite; an adjusting mechanism is provided in the box body, and the adjusting mechanism includes a first adjusting mechanism and a second adjusting mechanism; the first adjusting mechanism is provided on the first power output shaft, and the second adjusting mechanism is provided on the second power output shaft; a first driving gear is provided at the end of the first power output shaft, a second driving gear is provided at the end of the second power output shaft, and the first driving gear and the second driving gear both mesh with the same rack; the first adjusting mechanism is used to adjust the meshing clearance between the first driving gear and the rack, and the second adjusting mechanism is used to adjust the meshing clearance between the second driving gear and the rack.

[0007] Preferably, the first adjusting mechanism includes a first tension spring and a first adjusting piston. The first tension spring is sleeved on the first power output shaft and is clamped between the first transmission gear and the lower part of the box body; the first adjusting piston is located between the box body and the first helical gear, the cylinder base of the first adjusting piston is fixedly connected to the upper part of the box body, and a thrust bearing is clamped between the piston of the first adjusting piston and the first helical gear.

[0008] Preferably, the second adjusting mechanism includes a second tension spring and a second adjusting piston. The second tension spring is sleeved on the second power output shaft and is clamped between the second transmission gear and the upper part of the box body; the second adjusting piston is located between the box body and the second helical gear, the cylinder base of the second adjusting piston is fixedly connected to the lower part of the box body, and a thrust bearing is clamped between the piston of the second adjusting piston and the second helical gear.

[0009] Preferably, the first adjusting mechanism and the second adjusting mechanism have the same model.

[0010] Preferably, both the first tension spring and the second tension spring are disc springs.

[0011] Preferably, the first transmission gear, the first helical gear and the first driving gear are all right-handed helical gears, and the second transmission gear, the second helical gear and the second driving gear are all left-handed helical gears.

[0012] Preferably, the power input shaft is directly connected to a servo motor or is connected to a servo motor through a pulley drive.

[0013] Preferably, guide keys are respectively arranged in the cylinders of the first adjusting piston and the second adjusting piston.

[0014] After adopting the above technical solution, the beneficial technical effects achieved by the present utility model are as follows:

[0015] 1. Since the first adjusting mechanism is arranged on the first power output shaft in the box body and the second adjusting mechanism is arranged on the second power output shaft, when the meshing clearance between the first transmission gear, the second transmission gear and the rack increases and affects the machining accuracy, the meshing clearances between the first transmission gear, the second transmission gear and the rack are respectively adjusted, so as to maintain the machining accuracy. Compared with the previous method of only arranging the tension spring, the above first adjusting mechanism and second adjusting mechanism can not only timely adjust the elastic force of the tension spring, but also the first adjusting mechanism and the second adjusting mechanism can respectively adjust the magnitude of the thrust, meeting the actual use requirements, thereby further prolonging the service life of the backlash eliminator box and reducing the maintenance cost of the equipment.

[0016] 2. Since the first tension spring and the first adjusting piston are arranged in the first adjusting mechanism, the first tension spring is sleeved on the first power output shaft, the second adjusting mechanism includes the second tension spring and the second adjusting piston, and the thrusts of the first adjusting piston and the second adjusting piston are stable, and stable thrusts can be respectively provided for the first tension spring and the second tension spring, which is applicable to heavy loads, convenient to control, and can make the disc spring maintain a lasting elastic force. Therefore, the use requirements can be met without replacing the backlash eliminator box. Description of the Drawings

[0017] Figure 1 is a schematic diagram of an embodiment of the backlash eliminator box of the present utility model;

[0018] Figure 2 is Figure 1 an enlarged view of part A in

[0019] In the figure,

[0020] 1. Box body;

[0021] 2. Power input shaft; 21. First transmission gear; 22. Second transmission gear;

[0022] 3. Power output shaft; 31. First power output shaft; 311. First helical gear; 312. First driving gear; 32. Second power output shaft; 321. Second helical gear; 322. Second driving gear;

[0023] 4. First adjusting mechanism; 41. First tension spring; 42. First adjusting piston;

[0024] 5. Second adjusting mechanism; 51. Second tension spring; 52. Second adjusting piston; 521. Guide key; 522. Cylinder block

[0025] 6. Servo motor

[0026] 7. Rack Detailed implementation manners

[0027] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0028] See Figure 1 - Figure 2 , the present utility model provides a backlash eliminator box, including: a box body 1, a power input shaft 2 and a power output shaft 3 are arranged in the box body 1, and the power output shaft 3 includes a first power output shaft 31 and a second power output shaft 32; generally there is a power input shaft 2, which can be directly connected to the servo motor 6 through a coupling, or the power input shaft 2 can be connected to the servo motor 6 through a pulley mechanism. Essentially, it is a power input shaft 2 that drives the rotation of two power output shafts 3 at the same time.

[0029] A first helical gear 311 is arranged on the first power output shaft 31, a second helical gear 321 is arranged on the second power output shaft 32, the power input shaft 2 is located between the first power output shaft 31 and the second power output shaft 32, and the power input shaft 2 is provided with a first transmission gear 21 that meshes with the first helical gear 311 and a second transmission gear 22 that meshes with the second helical gear 321. The inclination directions of the first helical gear 311 and the second helical gear 321 are opposite; the opposite directions of the first helical gear and the second helical gear are helpful to achieve dynamic balance.

[0030] When the first driving gear 312 and the second driving gear 322 jointly mesh with the same rack 7, the first adjusting mechanism 4 is used to adjust the meshing clearance between the first driving gear 312 and the rack 7, and the second adjusting mechanism 5 is used to adjust the meshing clearance between the second driving gear 322 and the rack 7. The first driving gear 312 and the second driving gear 322 mesh with the rack 7 at the same time. After running for a period of time, when the meshing clearances of the first driving gear 312, the second driving gear 322 and the rack 7 increase, the adjusting clearances are respectively changed through the first adjusting mechanism 4 and the second adjusting mechanism 5 to eliminate the transmission noise and ensure the machining accuracy.

[0031] The first adjusting mechanism 4 of the present utility model includes a first tension spring 41 and a first adjusting piston 42. The first tension spring 41 is sleeved on the first power output shaft 31 and is clamped between the first transmission gear 21 and the lower part of the box body 1; the first adjusting piston 42 is located between the box body 1 and the first helical gear 311. The cylinder block of the first adjusting piston 42 is fixedly connected to the upper part of the box body 1, and a thrust bearing is clamped between the piston of the first adjusting piston 42 and the first helical gear 311. Refer to Figure 1 , the first tension spring 41 is located at the lower part. Therefore, the first adjusting piston 42 pushes the first helical gear 311 downward. At this time, the meshing between the first helical gear 311 and the first transmission gear 21 will not be affected. When the position of the first helical gear 311 changes, the compression degree of the first tension spring 41 will change, and further the position of the first driving gear 312 on the first power output shaft 31 will change. Therefore, the meshing clearance between the first transmission gear 21 and the rack 7 can be changed, the meshing clearance is reduced, and the machining accuracy is guaranteed. The thrust bearing is a prior art, which reduces friction and is suitable for heavy loads.

[0032] The second adjusting mechanism 5 of the present utility model includes a second tension spring 51 and a second adjusting piston 52. The second tension spring 51 is sleeved on the second power output shaft 32 and is clamped between the second transmission gear and the upper part of the box body 1; the second adjusting piston 52 is located between the box body 1 and the second helical gear 321. The cylinder block of the second adjusting piston 52 is fixedly connected to the lower part of the box body 1, and a thrust bearing is clamped between the piston of the second adjusting piston 52 and the second helical gear 321. The working principle of the second power output shaft 32 is the same as that of the above-mentioned first power output shaft 31, only the direction is changed. In order to ensure balanced force, the second tension spring 51 is located at the top of the second power output shaft 32. At this time, the second adjusting piston 52 pushes the second helical gear 321 upward, changes the elastic force of the second tension spring 51, and thus drives the change of the position of the second transmission gear 22 to meet the backlash elimination requirement.

[0033] The first adjusting mechanism 4 and the second adjusting mechanism 5 of the present utility model have the same model. The first adjusting mechanism 4 and the second adjusting mechanism 5 are symmetrically distributed about the center, with the same model, which is convenient for installation and procurement and can ensure balanced force.

[0034] The first tension spring 41 and the second tension spring 51 of the present utility model are both disc springs. The disc spring is a prior art, with a smaller volume and is suitable for small spaces.

[0035] The first transmission gear 21, the first helical gear 311 and the first driving gear 312 of the present utility model are all right-handed helical gears, and the second transmission gear, the second helical gear 321 and the second driving gear 322 are all left-handed helical gears. The power input shaft 2 of the present utility model is directly connected to the servo motor 6 or is connected to the servo motor 6 through a pulley drive. The helical gears located on the first power output shaft 31 and the second power output shaft 32 are the same in all parameters except for the different inclination directions. In order to ensure balanced force and mutual cancellation, vibration can be reduced. The first adjustment mechanism 4 and the adjustment mechanism 5 are also the same. The distinction is only for the convenience of description, and they are the same during actual procurement and installation.

[0036] In the cylinder block 522 of the first adjustment piston 42 and the second adjustment piston 52 of the present utility model, guide keys 521 are further respectively provided. A guide key 521 is provided in each adjustment piston for support to ensure that the piston or the piston rod does not directly contact and rub against the cylinder block during movement.

[0037] Certainly, the present utility model may also have many other embodiments. Without departing from the spirit and essence of the present utility model, those skilled in the art can make various corresponding changes and deformations according to the present utility model. However, these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present utility model.

Claims

1. A backlash elimination box, characterized in that, Comprising: A box body, within which a power input shaft and a power output shaft are provided. The power output shaft includes a first power output shaft and a second power output shaft. One end of the first power output shaft extends out of the box body and is provided with a first driving gear, and one end of the second power output shaft extends out of the box body and is provided with a second driving gear; A first helical gear is provided on the part of the first power output shaft located within the box body, and a second helical gear is provided on the part of the second power output shaft located within the box body. The power input shaft is located between the first power output shaft and the second power output shaft. The power input shaft is provided with a first transmission gear meshing with the first helical gear and a second transmission gear meshing with the second helical gear. The inclination directions of the first helical gear and the second helical gear are opposite; A first adjusting mechanism is provided on the first power output shaft, and a second adjusting mechanism is provided on the second power output shaft; When the first driving gear and the second driving gear jointly mesh with the same rack, the first adjusting mechanism is used to adjust the meshing clearance between the first driving gear and the rack, and the second adjusting mechanism is used to adjust the meshing clearance between the second driving gear and the rack.

2. The backlash eliminator box according to claim 1, characterized in that The first adjusting mechanism includes a first tension spring and a first adjusting piston. The first tension spring sleeves the first power output shaft and is clamped between the first transmission gear and the lower part of the box body; The first adjusting piston is located between the box body and the first helical gear. The cylinder base of the first adjusting piston is fixedly connected to the upper part of the box body, and a thrust bearing is clamped between the piston of the first adjusting piston and the first helical gear.

3. The backlash eliminator box according to claim 2, wherein The second adjusting mechanism includes a second tension spring and a second adjusting piston. The second tension spring sleeves the second power output shaft and is clamped between the second transmission gear and the upper part of the box body; The second adjusting piston is located between the box body and the second helical gear. The cylinder base of the second adjusting piston is fixedly connected to the lower part of the box body, and a thrust bearing is clamped between the piston of the second adjusting piston and the second helical gear.

4. The backlash eliminator box according to claim 3, characterized in that, The first adjusting mechanism and the second adjusting mechanism have the same model.

5. The backlash eliminator box according to claim 4, wherein, Both the first tension spring and the second tension spring are disc springs.

6. The backlash eliminator box according to claim 5, wherein, The first transmission gear, the first helical gear and the first driving gear are all right-handed helical gears, and the second transmission gear, the second helical gear and the second driving gear are all left-handed helical gears.

7. The backlash eliminator box according to claim 1, characterized in that, The power input shaft is directly connected to a servo motor or is connected to the servo motor through a belt pulley transmission.

8. The backlash eliminator box according to claim 3, wherein, Guide keys are respectively provided in the cylinders of the first adjusting piston and the second adjusting piston.

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