Positive gear backlash device

Abstract

The utility model discloses a kind of driving gear anti-backlash devices, including driving shaft, main shaft, fixed driving gear, anti-backlash driving gear, disc spring, limit flange, expansion sleeve, locating nut and shell;Driving shaft is coaxially fixedly connected with main shaft through expansion sleeve, main shaft is installed in shell through a group of support bearings, fixed driving gear is fixedly connected on main shaft, anti-backlash driving gear is installed on main shaft through the sliding installation structure of axial direction;Limit flange is installed on main shaft, disc spring is installed between limit flange and anti-backlash driving gear;Locating nut is installed on main shaft by thread, limit flange is pressed by locating nut.In transmission process, the axial position of anti-backlash driving gear will be adjusted by the elastic force of disc spring, so that anti-backlash driving gear keeps close contact with driven gear at all times, plays the role of self-adapting anti-backlash, thereby eliminating or reducing the movement error and the problem of vibration caused by uneven gap.

Description

Technical Field

[0001] This utility model belongs to the technical field of parts for transmission devices or mechanisms, and specifically relates to a backlash elimination device for active gears. Background Technology

[0002] Gear drives are currently the most commonly used transmission method. Gear drives utilize the meshing of the teeth of two gears to transmit power and motion in a mechanical transmission. They are characterized by their compact structure, high efficiency, and long service life. However, due to factors such as the machining precision of the gears, the precision of mechanical assembly, and the varying precision of the driven gears, backlash often occurs. Backlash frequently affects transmission accuracy, and consequently, machining accuracy. Furthermore, due to the high transmission speed, backlash can lead to increased noise and vibration during transmission. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an active gear backlash elimination device.

[0004] This utility model is achieved through the following technical solution:

[0005] A backlash elimination device for a drive gear includes a drive shaft, a main shaft, a fixed drive gear, a backlash elimination drive gear, a disc spring, a limiting flange, a tensioning sleeve, a positioning nut, and a housing;

[0006] The drive shaft is coaxially and fixedly connected to the main shaft via a tensioning sleeve. The main shaft is mounted inside the housing via a set of support bearings. The fixed drive gear is fixedly connected to the main shaft. The backlash-free drive gear is mounted on the main shaft via an axial sliding mounting structure.

[0007] The limiting flange is fitted onto the main shaft, and a disc spring is installed between the limiting flange and the backlash-eliminating drive gear. The positioning nut is threaded onto the main shaft and is located on one side of the outer end face of the limiting flange, thereby pressing the limiting flange together. Multiple adjusting bolts are also provided on the limiting flange, and the minimum distance between the backlash-eliminating drive gear and the limiting flange is adjusted by adjusting the screwing depth of the adjusting bolts.

[0008] In the above technical solution, a spindle core hole is provided at the end of the spindle. The diameter of the spindle core hole is larger than the diameter of the drive shaft. The drive shaft is embedded and installed into the spindle core hole through a tensioning sleeve. The outer end of the tensioning sleeve has a flange. Multiple corresponding threaded holes are provided on the flange of the tensioning sleeve and the end face of the spindle. Bolts are installed in the threaded holes, and the tensioning sleeve and the spindle are connected by bolts. The tensioning sleeve is tightened between the spindle core hole and the drive shaft, thereby realizing the coaxial fixed connection between the drive shaft and the spindle.

[0009] In the above technical solution, the structure of the sliding installation structure can be: a sliding groove along the main shaft axis is provided on the outer wall of the main shaft, and a corresponding protrusion is provided on the inner wall of the backlash-eliminating drive gear. The protrusion slides with the sliding groove, thereby realizing that the backlash-eliminating drive gear has the freedom to slide along the main shaft axis.

[0010] In the above technical solution, mounting grooves are provided on the opposite end faces of the limiting flange and the backlash-eliminating drive gear, and the two ends of the disc spring are installed in the mounting grooves.

[0011] In the above technical solution, the outer shell includes a first shell and a second shell, which are connected by bolts; the support bearing is provided in the first shell to support the main shaft; and a fixed drive gear and a backlash-eliminating drive gear are provided in the second shell.

[0012] In the above technical solution, the outer shell is provided with an opening, through which the fixed driving gear and the backlash-free driving gear protrude, so that the fixed driving gear and the backlash-free driving gear can mesh with the external driven output wheel to realize transmission.

[0013] In the above technical solution, the drive shaft is driven by a motor and a reducer assembly.

[0014] The advantages and beneficial effects of this utility model are as follows:

[0015] In the transmission process, the axial position of the backlash-eliminating drive gear is adjusted by the elastic force of the disc spring, so that the backlash-eliminating drive gear always maintains close contact with the driven gear and bears a certain load, playing an adaptive backlash-eliminating role, thereby eliminating or reducing motion errors and vibration problems caused by uneven backlash.

[0016] The positioning nut of this invention is threaded onto the main shaft and is located on one side of the outer end face of the limiting flange. The positioning nut is used to press the limiting flange, and the position of the limiting flange is adjusted by adjusting the screw depth of the positioning nut, thereby adjusting the initial elastic force of the disc spring.

[0017] This utility model also provides multiple adjusting bolts on the limiting flange. By adjusting the screwing depth of the adjusting bolts, the minimum distance between the backlash-eliminating drive gear and the limiting flange can be adjusted. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the active gear backlash elimination device of this utility model.

[0019] Figure 2 This is a partial structural schematic diagram of the drive gear backlash elimination device of this utility model.

[0020] Figure 3This is a partial structural schematic diagram of the drive gear backlash elimination device of this utility model.

[0021] Figure 4 This is a cross-sectional view of the drive gear backlash elimination device of this utility model.

[0022] Figure 5 This is a schematic diagram of the active gear backlash elimination device of this utility model in use.

[0023] For those skilled in the art, other related figures can be obtained from the above figures without any creative effort. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.

[0025] See appendix Figure 1 -Appendix Figure 4 A backlash elimination device for a drive gear includes a drive shaft 1, a main shaft 2, a fixed drive gear 3, a backlash elimination drive gear 4, a disc spring 5, a limiting flange 6, a tensioning sleeve 7, a positioning nut 8, and a housing 9.

[0026] The drive shaft 1 serves as the power input and is coaxially fixedly connected to the main shaft 2 via a tensioning sleeve 7. (Specifically, a central hole 21 is provided at the end of the main shaft 2, the diameter of which is larger than the diameter of the drive shaft 1. The drive shaft 1 is embedded in the central hole 21 via the tensioning sleeve 7. The outer end of the tensioning sleeve 7 has a flange 71. Multiple corresponding threaded holes are provided on the flange 71 of the tensioning sleeve and the end face of the main shaft. Bolts 72 are installed in the threaded holes, and the tensioning sleeve 7 and the main shaft 2 are connected by the bolts 72, so that the tensioning sleeve 7 is tightened between the central hole 21 and the drive shaft 1, thereby achieving a coaxial fixed connection between the drive shaft 1 and the main shaft 2.) Thus, the drive shaft can drive the main shaft to rotate synchronously. Further, preferably, the drive shaft 1 is driven by a motor and a reducer assembly; that is, the drive shaft 1 is the output shaft of the reducer 12, and the input shaft of the reducer is connected to the output shaft of the motor 11.

[0027] The main shaft 2 is mounted inside the housing 9 via a set of support bearings 22. The fixed drive gear 3 is fixedly connected to the main shaft 2. The backlash-free drive gear 4 is mounted on the main shaft 2 via an axial sliding mounting structure, so that the backlash-free drive gear 4 has the freedom to slide along the axial direction of the main shaft 2. For example, the structure of the sliding mounting structure can be: a groove 23 along the axial direction of the main shaft is provided on the outer wall of the main shaft 2, and a corresponding protrusion is provided on the inner wall of the backlash-free drive gear. The protrusion slides with the groove, thereby realizing the freedom of the backlash-free drive gear 4 to slide along the axial direction of the main shaft 2.

[0028] The limiting flange 6 is fitted onto the main shaft 2 and is located on the opposite side of the fixed driving gear 3 of the backlash-eliminating driving gear 4. A disc spring 5 is installed between the limiting flange 6 and the backlash-eliminating driving gear 4, and the disc spring 5 is fitted onto the main shaft 2. The disc spring 5 provides elastic force to the backlash-eliminating driving gear 4 in the direction of the fixed driving gear 3. Furthermore, in order to ensure the installation stability of the disc spring 5, mounting grooves are provided on the opposite end faces of the limiting flange 6 and the backlash-eliminating driving gear 4, and the two ends of the disc spring 5 are installed in the mounting grooves. Multiple adjusting bolts 61 are also provided on the limiting flange 6. By adjusting the screwing depth of the adjusting bolts 61, the minimum distance between the backlash-eliminating drive gear 4 and the limiting flange 6 is adjusted, that is, the extreme position of the backlash-eliminating drive gear 4 in the direction of the drive shaft 1 is adjusted. When the backlash-eliminating drive gear 4 reaches the extreme position, it is rigidly supported by the adjusting bolts 61, thereby ensuring that the backlash-eliminating drive gear 4 has a sufficiently large ultimate load-bearing capacity (it should be noted that this ultimate load-bearing capacity is unidirectional. For example, when rotating in the reverse direction, the backlash-eliminating drive gear 4 is subjected to load force, while when rotating in the forward direction, the drive gear 4 is subjected to load force).

[0029] The positioning nut 8 is threaded onto the main shaft 2 and is located on one side of the outer end face of the limiting flange 6. The positioning nut 8 is used to press the limiting flange 6, and the position of the limiting flange 6 is adjusted by adjusting the screw depth of the positioning nut 8, thereby adjusting the initial elastic force of the disc spring 5.

[0030] Furthermore, the outer casing 9 includes a first casing 91 and a second casing 92, which are connected by bolts; the first casing 91 is provided with the support bearing 22 for supporting the main shaft 2; the second casing 92 is provided with a fixed drive gear 3 and a backlash-eliminating drive gear 4.

[0031] Furthermore, the outer casing 9 is provided with an opening 93 through which the fixed driving gear 3 and the backlash-free driving gear 4 protrude, allowing the fixed driving gear 3 and the backlash-free driving gear 4 to mesh with an external driven gear (see Appendix). Figure 5 ), to achieve transmission.

[0032] During operation, the fixed driving gear 3 and the backlash-eliminating driving gear 4 mesh with the external driven gear. During transmission, the spring force of the disc spring 5 adjusts the axial position of the backlash-eliminating driving gear 4, ensuring it remains in close contact with the driven gear and bears a certain load, thus achieving self-adaptive backlash elimination and eliminating or reducing motion errors and vibrations caused by uneven backlash. During transmission, the fixed driving gear 3 bears the load force in one direction of rotation (e.g., during forward rotation, the driving gear 4 bears the load force), while the backlash-eliminating driving gear 4 bears the load in the other direction of rotation (e.g., during reverse rotation, the backlash-eliminating driving gear 4 bears the load force). Initially, the load-bearing force provided by the backlash-eliminating driving gear 4 is a flexible force under the action of the disc spring 5. When the driven gear is under a large load and the backlash-eliminating driving gear 4 moves to its limit position, it is rigidly supported by the adjusting bolt 61, ensuring that the backlash-eliminating driving gear 4 has a sufficiently large ultimate load-bearing capacity. By adjusting the screwing depth of bolt 61, the limit position of the backlash-eliminating drive gear 4 can be adjusted so that the limit position is adapted to the tooth pitch of the driven gear (if the limit position is too large, the axial range of motion of the backlash-eliminating drive gear 4 will increase, and the motion error will increase; if the limit position is too small, the axial range of motion of the backlash-eliminating drive gear 4 will decrease, and it may not be able to adapt to the minimum tooth pitch of the driven gear).

[0033] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0034] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0035] The above description of the present utility model is exemplary. It should be noted that, without departing from the core of the present utility model, any simple modifications, alterations, or other equivalent substitutions that can be made by those skilled in the art without creative effort fall within the protection scope of the present utility model.

Claims

1. A backlash elimination device for a drive gear, characterized in that: Includes drive shaft, main shaft, fixed drive gear, backlash-free drive gear, disc spring, limit flange, tensioning sleeve, positioning nut and housing; The drive shaft is coaxially and fixedly connected to the main shaft via a tensioning sleeve. The main shaft is mounted inside the housing via a set of support bearings. The fixed drive gear is fixedly connected to the main shaft. The backlash-free drive gear is mounted on the main shaft via an axial sliding mounting structure. The limiting flange is fitted onto the main shaft, and a disc spring is installed between the limiting flange and the backlash-eliminating drive gear; the positioning nut is threaded onto the main shaft and is located on one side of the outer end face of the limiting flange, and the limiting flange is pressed by the positioning nut; multiple adjusting bolts are also provided on the limiting flange.

2. The backlash elimination device for the driving gear according to claim 1, characterized in that: A spindle bore is provided at the end of the spindle. The diameter of the spindle bore is larger than that of the drive shaft. The drive shaft is installed into the spindle bore by a tensioning sleeve. The outer end of the tensioning sleeve has a flange. Multiple corresponding threaded holes are provided on the flange of the tensioning sleeve and the end face of the spindle. Bolts are installed in the threaded holes, and the tensioning sleeve and the spindle are connected by bolts. The tensioning sleeve is tightened between the spindle bore and the drive shaft.

3. The backlash elimination device for the driving gear according to claim 1, characterized in that: The sliding installation structure is as follows: a sliding groove along the axial direction of the main shaft is provided on the outer wall of the main shaft, and a corresponding protrusion is provided on the inner wall of the backlash-eliminating drive gear, with the protrusion slidingly engaging with the sliding groove.

4. The backlash elimination device for the driving gear according to claim 1, characterized in that: Mounting grooves are provided on the opposite end faces of the limiting flange and the backlash-eliminating drive gear, and the two ends of the disc spring are installed in the mounting grooves.

5. The backlash elimination device for the driving gear according to claim 1, characterized in that: The outer casing includes a first housing and a second housing, which are connected by bolts; the support bearing is provided inside the first housing to support the main shaft; and a fixed drive gear and a backlash-eliminating drive gear are provided inside the second housing.

6. The backlash elimination device for the driving gear according to claim 1, characterized in that: The outer casing has an opening through which the fixed drive gear and the backlash-eliminating drive gear protrude.

Images