Gear meshing anti-backlash mechanism for speed change gear box

Abstract

The utility model discloses a gear meshing anti-backlash mechanism for a speed change gear box, and relates to the technical field of gear backlash elimination. The speed change gear box comprises a speed change gear box body and a gear meshing anti-backlash mechanism. A gear meshing anti-backlash mechanism is assembled in the speed change gear box and comprises a belleville spring and a one-way thrust ball bearing; a needle bearing is assembled on the peripheral side face of the transmission shaft C. A one-way thrust ball bearing is matched with the end face of the transmission shaft C. A lining shaft is assembled on the one-way thrust ball bearing. A T-shaped shaft is fixed to the inner bottom face of the lining shaft. A belleville spring is matched with the peripheral side face of the T-shaped shaft. An adjusting screw is matched with the top face of the T-shaped shaft. The lining shaft and the needle bearing are both matched with the inner wall of the lining, and an end cover is assembled on the top of the lining. Through the design effect of paired use of the belleville spring and the one-way thrust ball bearing, the self-locking type one-way thrust ball bearing has the advantages of being extremely low in manufacturing cost, good in self-locking performance, high in bearing capacity, relatively simple in anti-backlash structure and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of gear backlash elimination, in particular to a gear meshing backlash elimination mechanism for a speed change gear box. Background Art

[0002] In mechanical transmission, the design of the mechanism using gear meshing transmission is particularly widespread, and its characteristics are high transmission efficiency, stable transmission ratio, and multi-speed transmission. When designing the gear transmission mechanism of precision or high-end equipment, it is necessary to consider the control of the gear meshing clearance, that is, to design the corresponding gear clearance elimination mechanism. When the gear meshing backlash is too small, it is easy to cause heat, noise, vibration, and even tooth surface bonding or breakage during the gear movement; on the contrary, when the gear meshing backlash is too large, it will affect the positioning accuracy and repeated positioning accuracy of the equipment movement mechanism, and will also reduce the service life of the gear.

[0003] Aiming at the problem that the clearance in the existing gear box is too large or too small, the utility model designs a gear meshing clearance eliminating mechanism for the speed change gear box. Utility Model Content

[0004] The purpose of the utility model is to provide a gear meshing and backlash eliminating mechanism for a speed change gear box. Through the paired use design of a butterfly spring and a one-way thrust ball bearing, the utility model has the advantages of extremely low manufacturing cost, good self-locking property, high load-bearing capacity, simple backlash eliminating structure, etc., and solves the above-mentioned problem that the gap in the gear box is too large or too small.

[0005] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0006] The utility model discloses a gear meshing and backlash eliminating mechanism for a speed change gear box, comprising a speed change gear box and a gear meshing and backlash eliminating mechanism; the speed change gear box comprises a coaxial double gear, a coaxial triple gear and a transmission shaft group; the speed change gear box is transmission-connected with a servo drive motor; the transmission shaft group comprises a transmission shaft A, a transmission shaft B, a transmission shaft C, a transmission shaft D and a transmission shaft E; the transmission shaft A is fixedly connected with the output shaft of the servo drive motor through a coupling; the transmission shaft A and the transmission shaft B, the transmission shaft B and the transmission shaft C are meshed and transmitted through the coaxial double gears, the transmission shaft C and the transmission shaft D, the transmission shaft C and the transmission shaft E are meshed and transmitted through the coaxial triple gears Meshing transmission is carried out; the gear meshing anti-backlash mechanism includes an adjusting screw, a locking nut, a butterfly spring and a one-way thrust ball bearing; the peripheral side of the transmission shaft C is equipped with a needle bearing, the end face of the transmission shaft C is matched with a one-way thrust ball bearing, the one-way thrust ball bearing is equipped with a bushing shaft, the inner bottom surface of the bushing shaft is fixed with a T-shaft, the peripheral side of the T-shaft is matched with a butterfly spring, the top surface of the T-shaft is matched with an adjusting screw, the bushing shaft is fixed with an elastic retaining ring above the butterfly spring, the peripheral side surfaces of the bushing shaft and the needle bearing are matched with the inner wall of the bushing, the top of the bushing is equipped with an end cover, the adjusting screw passes through the end cover, and is matched with a locking nut.

[0007] Among them, the coaxial double gears include spur gear B and spur gear C; the coaxial triple gears include spur gear D, helical gear A and helical gear B.

[0008] As a preferred technical solution of the utility model, a spur gear A is fixedly installed on the transmission shaft A; a spur gear B and a spur gear C are fixedly installed on the transmission shaft B; a spur gear D, a helical gear A and a helical gear B are fixedly installed on the transmission shaft C; the transmission shaft D and the transmission shaft E are the output shafts of the speed change gear box; the transmission shaft D and the transmission shaft E are respectively fixedly installed with a helical gear C and a helical gear D.

[0009] As an optimal technical solution of the utility model, the transmission shaft A is connected to the transmission shaft B through the meshing transmission of spur gear A and spur gear B; the transmission shaft B is connected to the transmission shaft C through the meshing transmission of spur gear C and spur gear D; the transmission shaft C is connected to the transmission shaft D through the meshing transmission of helical gear A and helical gear C; the transmission shaft C is connected to the transmission shaft E through the meshing transmission of helical gear B and helical gear D.

[0010] The utility model has the following beneficial effects:

[0011] The utility model has the advantages of extremely low manufacturing cost, good self-locking property, high load-bearing capacity, simple anti-backlash structure, etc., through the matching design of the butterfly spring and the one-way thrust ball bearing, thus significantly reducing the manufacturing cost and difficulty.

[0012] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 It is the internal transmission structure diagram of the speed change gear box and the gear meshing backlash elimination mechanism of the utility model;

[0015] Figure 2 This is the internal meshing transmission principle diagram of the speed change gear box of the utility model;

[0016] Figure 3 for Figure 1 A partial enlarged view of the gear meshing anti-backlash mechanism at A in the middle;

[0017] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0018] 1- transmission shaft A, 2- transmission shaft B, 3- transmission shaft C, 4- transmission shaft D, 5- transmission shaft E, 10- servo drive motor, 11- spur gear A, 12- spur gear B, 13- spur gear C, 14- spur gear D, 15- helical gear A, 16- helical gear B, 17- helical gear C, 18- helical gear D, 19- output shaft helical gear A, 20- output shaft helical gear B, 30- adjusting screw, 31- locking nut, 32- end cover, 33- bushing, 34- elastic retaining ring, 35- butterfly spring, 36- T-type shaft, 37- bushing shaft, 38- one-way thrust ball bearing, 39- needle roller bearing. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-3As shown, the utility model is a gear meshing and backlash elimination mechanism for a speed change gear box, comprising a speed change gear box and a gear meshing and backlash elimination mechanism; the speed change gear box comprises a coaxial double gear, a coaxial triple gear and a transmission shaft group; the speed change gear box is transmission-connected with a servo drive motor 10; the transmission shaft group comprises a transmission shaft A1, a transmission shaft B2, a transmission shaft C3, a transmission shaft D4 and a transmission shaft E5; the transmission shaft A1 is fixedly connected to the output shaft of the servo drive motor 10 through a coupling; the transmission shaft A1 and the transmission shaft B2, the transmission shaft B2 and the transmission shaft C3 are meshed and driven through the coaxial double gears, the transmission shaft C3 and the transmission shaft D4, the transmission shaft C3 and the transmission shaft E5 are meshed and driven through the coaxial triple gears; the gear meshing The anti-backlash mechanism includes an adjusting screw 30, a locking nut 31, a butterfly spring 35 and a one-way thrust ball bearing 38; a needle bearing 309 is mounted on the circumferential side of the transmission shaft C3, a one-way thrust ball bearing 38 is matched on the end face of the transmission shaft C3, a bushing shaft 37 is mounted on the one-way thrust ball bearing 38, a T-shaped shaft 36 is fixed to the inner bottom surface of the bushing shaft 37, a butterfly spring 35 is matched on the circumferential side of the T-shaped shaft 36, an adjusting screw 30 is matched on the top surface of the T-shaped shaft 36, an elastic retaining ring 34 is fixed to the bushing shaft 37 above the butterfly spring 35, the circumferential sides of the bushing shaft 37 and the needle bearing 309 are matched with the inner wall of the bushing 33, an end cover 32 is mounted on the top of the bushing 33, the adjusting screw 30 passes through the end cover 32, and is matched with a locking nut 31.

[0021] Among them, the coaxial double gears include spur gear B12 and spur gear C13; the coaxial triple gears include spur gear C14, helical gear A15 and helical gear B16; the transmission shaft A1 is fixedly installed with spur gear A11; the transmission shaft B2 is fixedly installed with spur gear B12 and spur gear C13; the transmission shaft C3 is fixedly installed with spur gear C14, helical gear A15 and helical gear B16; the transmission shaft D4 and the transmission shaft E5 are the output shafts of the speed change gear box; the transmission shaft D4 and the transmission shaft E5 are respectively fixedly installed with helical gears C17 and Helical gear D18; transmission shaft A1 is connected to transmission shaft B2 through meshing transmission of spur gear A11 and spur gear B12; transmission shaft B2 is connected to transmission shaft C3 through meshing transmission of spur gear C13 and spur gear C14; transmission shaft C3 is connected to transmission shaft D4 through meshing transmission of helical gear A15 and helical gear C17; transmission shaft C3 is connected to transmission shaft E5 through meshing transmission of helical gear B16 and helical gear D18; output shaft helical gear A19 and output shaft helical gear B20 are fixedly mounted on transmission shaft D4 and transmission shaft E5 respectively.

[0022] Among them, Figure 1The figure shows a precision gear meshing transmission gearbox, which is designed on the moving parts of the equipment. Through the output shaft bevel gear A19 and the output shaft bevel gear B20 in the gearbox, as a pair of output gear shafts, meshing and transmitting with the precision rack on the fixed part of the equipment, the moving parts of the equipment can achieve speed walking, positioning walking, reverse positioning walking and positioning stop movements; combined with Figure 2 From the gear meshing transmission principle diagram inside the gear box shown, it can be seen that when the servo drive motor 10 transmits a certain torque and speed to the spur gear B12 in the transmission shaft B2 through the spur gear A11; at the same time, because the spur gear B12 and the spur gear C13 are coaxial double gears, the speed and torque on the spur gear B12 are equivalently transmitted to the spur gear C13; then, the spur gear C13 transmits the speed and torque to the spur gear C14 in the transmission shaft C3, because the spur gear C14 and the helical gear A15 and the helical gear B16 are coaxial triple gears, and the helical gear A15 is meshed with the helical gear C17 in the transmission shaft D4, and the helical gear B16 is meshed with the helical gear D18 in the transmission shaft E5 at the same time, so the transmission shaft C3 transmits the torque and speed from the servo drive motor 10 to the transmission shafts D4 and E5 at the same time. Then it is transmitted to the output shaft bevel gear A19 and the output shaft bevel gear B20; finally, the output shaft bevel gear A19 and the output shaft bevel gear B20 are meshed with the rack at the same time, and the speed and torque are transmitted.

[0023] In order to adjust the meshing clearance between the bevel gear A15 and the bevel gear C17, the bevel gear B16 and the bevel gear D18, and compensate for the transmission accuracy error caused by the meshing clearance, a set of mechanical anti-backlash mechanism is designed at the end of the transmission shaft C3, such as Figure 3 The figure shows a mechanical backlash elimination mechanism composed of a butterfly spring 35 and a one-way thrust ball bearing 38.

[0024] The anti-backlash principle is as follows: the above-mentioned speed change gearbox is installed and positioned, and the output shaft bevel gear A19 and the output shaft bevel gear B20 are correctly meshed with the corresponding racks at the same time; the adjusting screw 30 is properly tightened, and the adjusting screw 30 transmits the force to the T-shaft 36, so that the butterfly spring 35 is deformed by the force, and the axial preload force is transmitted to the bushing shaft 37, and then to the one-way thrust ball bearing 38, and then the preload force is transmitted to the transmission shaft C3 through the one-way thrust ball bearing 38, and the transmission shaft C3 transmits the axial preload force through the meshing of the bevel gear A15 and the bevel gear B16 with the bevel gear C17 and the bevel gear D18 respectively, which produces the transmission shaft D4 and the transmission shaft E5 respectively. Generate axial and radial preload, thereby effectively reducing or eliminating the meshing clearance of the helical gears and the meshing clearance between the gear racks, and finally achieving the purpose of eliminating the clearance; wherein, in the actual adjustment process, the adjusting screw 30 can be preliminarily fine-tuned, and then the reverse clearance size of the overall transmission system can be detected, and the adjusting screw 30 can be further adjusted according to the detection result, and finally the clearance elimination process can be achieved; the adjustment process is simple and convenient, and the locking nut 31 is tightened after adjustment to achieve the purpose of self-locking after adjustment; if the transmission mechanism is affected by dynamic load, the butterfly spring 35 will be elastically deformed at this time, and then absorb and compensate for the influence caused by the external load, and maintain and stabilize the preload force that was pre-adjusted in advance.

[0025] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0026] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A gear meshing backlash eliminating mechanism for a speed change gear box, characterized in that: It includes a speed change gear box and a gear meshing backlash elimination mechanism; The speed change gearbox comprises a coaxial double gear, a coaxial triple gear and a transmission shaft group; the speed change gearbox is transmission-connected to a servo drive motor (10); The transmission shaft assembly comprises a transmission shaft A (1), a transmission shaft B (2), a transmission shaft C (3), a transmission shaft D (4), and a transmission shaft E (5); the transmission shaft A (1) is fixedly connected to an output shaft of a servo drive motor (10) via a coupling; The transmission shaft A (1) and the transmission shaft B (2), and the transmission shaft B (2) and the transmission shaft C (3) are all meshed and transmitted through coaxial double gears, and the transmission shaft C (3) and the transmission shaft D (4), and the transmission shaft C (3) and the transmission shaft E (5) are all meshed and transmitted through coaxial triple gears; The gear meshing backlash elimination mechanism comprises an adjusting screw (30), a locking nut (31), a butterfly spring (35) and a one-way thrust ball bearing (38); The transmission shaft C (3) is provided with a needle bearing (309) on its circumferential side surface, and the end surface of the transmission shaft C (3) is matched with a one-way thrust ball bearing (38). The one-way thrust ball bearing (38) is provided with a bushing shaft (37). A T-shaped shaft (36) is fixed to the inner bottom surface of the bushing shaft (37). A butterfly spring (35) is matched with the circumferential side surface of the T-shaped shaft (36). An adjusting screw (30) is matched with the top surface of the T-shaped shaft (36). An elastic retaining ring (34) is fixed to the bushing shaft (37) above the butterfly spring (35). The circumferential side surfaces of the bushing shaft (37) and the needle bearing (309) are matched with the inner wall of the bushing (33). An end cover (32) is provided on the top of the bushing (33). The adjusting screw (30) passes through the end cover (32) and is matched with a locking nut (31).

2. The gear meshing backlash eliminating mechanism for a speed change gear box according to claim 1, characterized in that: The coaxial double gears include a spur gear B (12) and a spur gear C (13); the coaxial triple gears include a spur gear D (14), a helical gear A (15) and a helical gear B (16).

3. The gear meshing backlash eliminating mechanism for a speed change gear box according to claim 2, characterized in that: The transmission shaft A (1) is fixedly mounted with a spur gear A (11); the transmission shaft B (2) is fixedly mounted with a spur gear B (12) and a spur gear C (13); the transmission shaft C (3) is fixedly mounted with a spur gear D (14), a helical gear A (15) and a helical gear B (16); the transmission shaft D (4) and the transmission shaft E (5) are output shafts of a speed change gear box; the transmission shaft D (4) and the transmission shaft E (5) are respectively fixedly mounted with a helical gear C (17) and a helical gear D (18).

4. The gear meshing backlash eliminating mechanism for a speed change gear box according to claim 3, characterized in that: The transmission shaft A (1) is connected to the transmission shaft B (2) by meshing transmission through a spur gear A (11) and a spur gear B (12); the transmission shaft B (2) is connected to the transmission shaft C (3) by meshing transmission through a spur gear C (13) and a spur gear D (14); the transmission shaft C (3) is connected to the transmission shaft D (4) by meshing transmission through a bevel gear A (15) and a bevel gear C (17); the transmission shaft C (3) is connected to the transmission shaft E (5) by meshing transmission through a bevel gear B (16) and a bevel gear D (18).

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