Zero-backlash ninety-degree double-worm and worm gear mechanism and precise rotary table thereof

Abstract

The zero-back-clearance ninety-degree double-worm and worm gear mechanism comprises a first worm mechanism, a second worm mechanism and a worm gear, the first worm mechanism and the second worm mechanism are arranged in a ninety-degree mode, the first worm mechanism and the second worm mechanism are both in meshing transmission with the worm gear, the first worm mechanism comprises a first worm, and the second worm mechanism comprises a second worm. The first deep groove ball bearing mechanism and the coupler are sequentially connected with one side of the first worm from inside to outside, the second deep groove ball bearing and the first bevel gear are sequentially connected with the other side of the first worm from inside to outside, and the coupler is connected with the motor; the second worm mechanism comprises a second worm, a third deep groove ball bearing mechanism, a first spring washer and an angular contact bearing mechanism which are sequentially connected with one side of the second worm from inside to outside, and a fourth deep groove ball bearing mechanism, a second spring washer and a second bevel gear which are sequentially connected with the other side of the second worm from inside to outside. The second bevel gear and the first bevel gear are in meshing transmission, zero return backlash is achieved, and the transmission precision is higher.

Description

Technical Field

[0001] The utility model relates to the field of mechanical equipment and automation, in particular to a zero-backlash 90-degree double worm and worm gear mechanism and a precision turntable thereof. Background Art

[0002] At present, the zero-backlash worm and worm gear mainly includes a parallel double worm and worm gear, and there are almost no actual products in the market. The disadvantage of the parallel double worm and worm gear is that its structure is complex and the volume is large; the mainstream zero-backlash worm and worm gear precision rotating mechanism in the market is a double-lead worm and worm gear structure. The disadvantages of this structure are: (1) The performance is unstable and regular maintenance is required because there will still be a gap after the double lead wears, and the gap needs to be adjusted regularly; (2) The force-bearing surface is small, only one side is stressed, so the output force of the worm gear is limited and the output torque is insufficient; (3) The price is expensive, usually ten times that of ordinary worms. In order to make up for the above shortcomings, a precision maintenance-free zero-backlash worm and worm gear rotating mechanism with a compact structure and low price is needed. Summary of the Invention

[0003] To overcome the deficiencies of the above-mentioned prior art, the purpose of the utility model is to provide a zero-backlash 90-degree double worm and worm gear mechanism and a precision turntable thereof, which are provided with two 90-degree double worms meshing with the worm gear, and the transmission between the two worm gears is synchronized through bevel gears, reducing the intermediate transition gears, making the volume more compact and the transmission accuracy higher.

[0004] To achieve the above purpose, the utility model provides a zero-backlash 90-degree double worm and worm gear mechanism, including:

[0005] A first worm mechanism, a second worm mechanism and a worm gear, the first worm mechanism and the second worm mechanism are arranged at 90 degrees, and the first worm mechanism and the second worm mechanism are both meshed with the worm gear for transmission;

[0006] The first worm mechanism includes a first worm, a first deep groove ball bearing mechanism and a coupling connected to one side of the first worm in sequence from inside to outside, and a second deep groove ball bearing and a first bevel gear connected to the other side of the first worm in sequence from inside to outside, and the coupling is connected to the motor;

[0007] The second worm mechanism includes a second worm, a third deep groove ball bearing mechanism, a first spring washer and an angular contact bearing mechanism connected to one side of the second worm in sequence from inside to outside, and a fourth deep groove ball bearing mechanism, a second spring washer and a second bevel gear connected to the other side of the second worm in sequence from inside to outside, and the second bevel gear is meshed with the first bevel gear for transmission to achieve zero backlash between the first worm, the second worm and the worm gear.

[0008] Preferably, threaded holes are provided on the side surfaces of the first bevel gear and the second bevel gear. By setting set screws corresponding to the threaded holes, the first bevel gear and the second bevel gear are respectively fixed to the first worm and the second worm.

[0009] To achieve the above object, the present utility model further provides a zero-backlash ninety-degree double-worm and worm-wheel precision turntable, including: the zero-backlash ninety-degree double-worm and worm-wheel mechanism and a rotating mechanism, and the rotating mechanism is internally connected to the zero-backlash ninety-degree double-worm and worm-wheel mechanism.

[0010] Preferably, the rotating mechanism includes a bottom plate, an intermediate fixing plate, a top rotating platform, columns, planar thrust needle bearings, a rotating shaft, and deep groove ball bearings;

[0011] The bottom plate is connected to the intermediate fixing plate through the columns. The zero-backlash ninety-degree double-worm and worm-wheel mechanism is installed between the bottom plate and the intermediate fixing plate. The planar thrust needle bearings are connected to the upper part of the intermediate fixing plate to support the top rotating platform. The deep groove ball bearings are connected to the intermediate fixing plate. The rotating shaft passes through the deep groove ball bearings and is fixed to the worm wheel by a flat key. The top rotating platform is fixed to the rotating shaft through screw holes.

[0012] Preferably, the first deep groove ball bearing mechanism, the second deep groove ball bearing mechanism, the third deep groove ball bearing mechanism, the fourth deep groove ball bearing mechanism, the angular contact bearing mechanism, and the motor are all connected to the base.

[0013] Preferably, the bottom plate is fixed to the equipment base or the workbench through second screw holes. There are four columns, which are all fixed to the four ends of the bottom plate through screw holes. The intermediate fixing plate is connected to the columns through screw holes.

[0014] Compared with the prior art, an embodiment disclosed by the present utility model has the following beneficial effects:

[0015] The two worms in the present application are at a 90° right angle. Through synchronous transmission by two bevel gears, the intermediate transition gears are reduced, the structure is simpler, the volume is more compact, and the transmission efficiency and precision are higher;

[0016] The present application can achieve real-time pressing of the worms, eliminating the process of adjusting the backlash of the double-lead single worm after a period of time. A double-worm structure is adopted, with more contact surfaces with the worm wheel, more uniform force, and a larger output torque for the worm wheel of the same specification. The worm adopted is a common worm different from the double-lead worm, greatly reducing the cost. Description of the Drawings

[0017] Figure 1Partial cross-sectional view of the zero-backlash 90-degree double worm and worm gear mechanism and its precision turntable disclosed in the embodiment;

[0018] Figure 2 Partial cross-sectional view of the zero-backlash 90-degree double worm and worm gear mechanism and its precision turntable in the rotating state disclosed in another embodiment;

[0019] Figure 3 Overall structure diagram of the zero-backlash 90-degree double worm and worm gear precision turntable disclosed in the embodiment;

[0020] Figure 4 Partial cross-sectional view of the zero-backlash 90-degree double worm and worm gear precision turntable disclosed in the embodiment.

[0021] In the figure: 1 - worm gear; 21 - first worm; 22 - second worm; 31 - first deep groove ball bearing mechanism; 32 - second deep groove ball bearing mechanism; 33 - third deep groove ball bearing mechanism; 34 - fourth deep groove ball bearing mechanism; 4 - coupling; 5 - motor; 61 - first bevel gear; 62 - second bevel gear; 71 - first spring washer; 72 - second spring washer; 8 - angular contact bearing mechanism; 91 - bottom plate; 92 - intermediate fixing plate; 93 - top rotating platform; 94 - column; 95 - flat thrust needle bearing; 96 - rotating shaft; 97 - deep groove ball bearing; 981 - first screw hole; 982 - second screw hole. Detailed implementation manners

[0022] The following describes the implementation manners of the present invention through specific specific examples in combination with the accompanying drawings. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific examples, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0023] Figure 1 Cross-sectional view of the zero-backlash 90-degree double worm and worm gear mechanism and its precision turntable disclosed in the embodiment. Refer to Figure 1 , a zero-backlash 90-degree double worm and worm gear mechanism, comprising:

[0024] A first worm mechanism, a second worm mechanism and a worm gear 1, the first worm mechanism and the second worm mechanism are connected at 90 degrees, and the first worm mechanism and the second worm mechanism are both meshed and driven with the worm gear 1;

[0025] The first worm mechanism includes a first worm 21, a first deep groove ball bearing mechanism 31 and a coupling 4 connected to one side of the first worm 21 in sequence from inside to outside, and a second deep groove ball bearing 32 and a first bevel gear 61 connected to the other side of the first worm 21 in sequence from inside to outside, and the coupling 4 is connected to the motor 5;

[0026] The second worm mechanism includes a second worm 22, a third deep groove ball bearing mechanism 33, a first spring washer 71, and an angular contact bearing mechanism 8 that are connected to one side of the second worm 22 in sequence from the inside to the outside, and a fourth deep groove ball bearing mechanism 34, a second spring washer 72, and a second bevel gear 62 that are connected to the other side of the second worm 22 in sequence from the inside to the outside. The second bevel gear 62 is in meshing transmission connection with the first bevel gear 61. Among them, threaded holes are provided on the side surfaces of both the first bevel gear 61 and the second bevel gear 62, and by setting set screws to be fixed to the ends of the first worm 21 and the second worm 22 respectively, the first worm 21 and the second worm 22 are fixed axially, realizing zero backlash between the two worms and the worm wheel.

[0027] Figure 2 It is a sectional view of a zero-backlash 90-degree double-worm and worm-wheel mechanism and its precision turntable disclosed in another embodiment. Figure 3 It is an overall structure diagram of a zero-backlash 90-degree double-worm and worm-wheel precision turntable disclosed in an embodiment. Figure 4 It is a partial sectional view of a zero-backlash 90-degree double-worm and worm-wheel precision turntable disclosed in an embodiment. Refer to Figures 1 - 4 , the rotating mechanism includes a bottom plate 91, an intermediate fixing plate 92, and a top rotating platform 93. The bottom plate 91 and the intermediate fixing plate 92 are connected by a column 94. The zero-backlash 90-degree double-worm and worm-wheel mechanism is arranged between the bottom plate 91 and the intermediate fixing plate 92. An axial thrust needle roller bearing 95 is connected to the upper part of the intermediate fixing plate 92, and the axial thrust needle roller bearing 95 is also connected to the top rotating platform 93 for supporting the top rotating platform 93. A rotating shaft 96 is connected to the inside of the worm wheel 1, and the rotating shaft 96 is fixed to the worm wheel 1 through a flat key. A deep groove ball bearing 97 is connected to the intermediate fixing plate 92, and the deep groove ball bearing 97 is sleeved on the rotating shaft to fix the rotating shaft 96. The rotating shaft 96 passes through the deep groove ball bearing 97 and is connected to the worm wheel 1, so that the rotating shaft 96 and the worm wheel 1 rotate synchronously. The rotating shaft 96 is connected to the top rotating platform 93 through a first screw hole 981, so that the worm wheel 1 drives the top rotating platform 93 to rotate through the rotating shaft 96, and finally realizes the assembly of the zero-backlash worm and worm-wheel turntable.

[0028] The zero-backlash 90-degree double-worm and worm-wheel mechanism is fixed to the bottom plate 91 through the first deep groove ball bearing mechanism 31, the second deep groove ball bearing mechanism 32, the third deep groove ball bearing mechanism 33, the fourth deep groove ball bearing mechanism 34, the angular contact bearing mechanism 8, and the motor 5.

[0029] The base plate 91 is fixed to the equipment base or the workbench through the second screw holes 982. Preferably, there are four columns 94, which are all fixed to the four ends of the base plate 91 through third screw holes (not marked in the drawings). The intermediate fixing plate 92 is fixed to the columns 94 through fourth screw holes (not marked in the drawings).

[0030] Specifically, the base plate 91 is fixed to the equipment base or the workbench through the second screw holes 982. The motor 5 is fixed on the base plate 91. The coupling 4 connects the motor 5. The first deep groove ball bearing 31 is fixed on the base plate 91. The first worm wheel 21 penetrates into the first deep groove ball bearing mechanism 31 and is locked with the coupling 3. The second deep groove ball bearing mechanism 32 penetrates into the first worm 21 and then is fixed on the base plate 91. The first bevel gear 61 penetrates into the end of the first worm 21. The fourth deep groove ball bearing mechanism 34 is fixed on the base plate 91. The second worm 22 penetrates into the fourth deep groove ball bearing mechanism 34 from left to right. The second bevel gear 62 and the second spring washer 72 penetrate into the end of the second worm 22 from right to left. The third deep groove ball bearing mechanism 33 penetrates into the second worm 22 from left to right and then is fixed on the base plate 91. The first spring washer 71 penetrates into the second worm 22 from left to right. The angular contact bearing mechanism 8 penetrates into the second worm 22 from left to right and then is fixed on the base plate 91. The second worm 22 can achieve axial displacement. Because there is a thrust from the first spring washer 71 to the angular contact bearing mechanism 8, there is always a pressure that makes the second worm 22 closely contact the worm wheel 1, so that the worm wheel 1 and the first worm 21 and the second worm 22 form a 90° clamping force, realizing zero backlash of the worm wheel 1. The second bevel gear 62 can achieve axial displacement. Because the second spring washer 72 abuts against the fourth deep groove ball bearing mechanism 34, there is always a pressure that presses the second bevel gear 62 closely against the first bevel gear 61, realizing zero backlash between the two bevel gears. Further, the first bevel gear 61 is provided with a first threaded hole on the side. By setting a first set screw corresponding to the first threaded hole, the first bevel gear 61 is fixed to the first worm 21. The second bevel gear 62 is provided with a second threaded hole on the side. By setting a second set screw corresponding to the second threaded hole, the second bevel gear 62 is fixed to the second worm 22, ensuring the axial fixation of the first worm 21 and the second worm 22. Thus, the zero-backlash assembly of the worm and the worm wheel is realized. That is to say, this solution adopts a ninety-degree double-worm and worm-wheel setting, and realizes zero return clearance through the synchronous transmission of two bevel gears, reducing the intermediate transition gears. Only one worm needs to provide power to ensure the rotation of the worm wheel. In addition, according to the different load sizes, the motor 5 can be a servo motor or a stepper motor.

[0031] It should be noted that the first deep groove ball bearing mechanism 31, the second deep groove ball bearing mechanism 32, the third deep groove ball bearing mechanism 33, and the fourth deep groove ball bearing mechanism 34 are all composed of deep groove ball bearings and corresponding bearing seats for the deep groove ball bearings. The angular contact bearing mechanism 8 is also composed of angular contact bearings and corresponding bearing seats for the angular contact bearings. The above-mentioned mechanisms are connected to the bottom plate 91 through the corresponding bearing seats.

[0032] The working principle of the present utility model lies in that: the zero-backlash ninety-degree double worm and worm gear mechanism is installed in the rotating mechanism, specifically installed between the bottom plate 91 of the rotating mechanism and the intermediate fixing plate 92, and is connected to the top rotating platform 93 of the rotating mechanism through the worm gear 1. The motor 5 drives the first worm 21, and the first worm 21 drives the second worm 22 to rotate through the meshing transmission of the first bevel gear 61 and the second bevel gear 62. The first worm 21 and the second worm 22 simultaneously drive the worm gear 1, and the worm gear 1 drives the top rotating platform 93 of the rotating mechanism to rotate through the rotating shaft 96.

[0033] In summary, for a zero-backlash ninety-degree double worm and worm gear mechanism and its precision turntable of the present utility model, two worms arranged at a ninety-degree right angle are meshed and driven with the worm gear. Conical gears are arranged at the ends of one side of the two worms, and the synchronism of the movements of the two worms is achieved through the meshing transmission of the two conical gears. Only by installing a motor on one worm to provide power can the rotation of the worm gear be realized. The double worm and worm gear mechanism is arranged in the rotating mechanism, and the top rotating platform of the rotating mechanism is connected to the worm gear, so that the worm gear drives the top rotating platform to rotate, realizing the rotation of the turntable.

[0034] The above embodiments only illustratively explain the principle and its effects of the present utility model, rather than being used to limit the present utility model. Any person skilled in the art can modify and change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, the scope of the right protection of the present utility model shall be as listed in the claims.

Claims

1. A zero backlash 90-degree double worm gear mechanism, comprising a first worm gear mechanism, a second worm gear mechanism and a worm gear (1), characterized in that: The first worm mechanism and the second worm mechanism are arranged at a 90-degree angle, and both the first worm mechanism and the second worm mechanism are meshed with the worm wheel (1) for transmission; The first worm mechanism comprises a first worm (21), a first deep groove ball bearing mechanism (31) and a coupling (4) connected to one side of the first worm (21) in sequence from the inside to the outside, and a second deep groove ball bearing (32) and a first bevel gear (61) connected to the other side of the first worm (21) in sequence from the inside to the outside, wherein the coupling (4) is connected to a motor (5); The second worm mechanism comprises a second worm (22), a third deep groove ball bearing mechanism (33), a first spring washer (71) and an angular contact bearing mechanism (8) connected to one side of the second worm (22) in sequence from the inside to the outside, and a fourth deep groove ball bearing mechanism (34), a second spring washer (72) and a second bevel gear (62) connected to the other side of the second worm (22) in sequence from the inside to the outside, the second bevel gear (62) meshing with the first bevel gear (61) to achieve zero backlash between the first worm (21), the second worm (22) and the worm wheel (1).

2. A zero backlash ninety degree double worm gear mechanism as claimed in claim 1, characterized in that: The side surfaces of the first bevel gear (61) and the second bevel gear (62) are both provided with threaded holes, and the first bevel gear (61) and the second bevel gear (62) are respectively fixed to the first worm (21) and the second worm (22) by providing set screws corresponding to the threaded holes.

3. A zero backlash 90-degree double worm gear precision turntable, characterized in that: The turntable comprises: The zero backlash ninety-degree double worm gear mechanism and the rotating mechanism as described in any one of claims 1-2, wherein the zero backlash ninety-degree double worm gear mechanism is internally connected to the rotating mechanism.

4. A zero backlash 90-degree double worm gear precision turntable as claimed in claim 3, characterized in that: The rotating mechanism comprises a bottom plate (91), an intermediate fixed plate (92), a top rotating platform (93), a column (94), a plane thrust needle roller bearing (95), a rotating shaft (96) and a deep groove ball bearing (97); The bottom plate (91) and the intermediate fixed plate (92) are connected via the column (94); the zero backlash ninety-degree double worm gear mechanism is installed between the bottom plate (91) and the intermediate fixed plate (92); the planar thrust needle roller bearing (95) is connected to the upper part of the intermediate fixed plate (92) to support the top rotating platform (93); the deep groove ball bearing (97) is connected to the intermediate fixed plate (92); the rotating shaft (96) passes through the deep groove ball bearing (97) and is fixed to the worm gear (1) via a flat key; and the top rotating platform (93) is fixed to the rotating shaft (96) via a first screw hole (981).

5. A zero backlash 90-degree double worm gear precision turntable as claimed in claim 4, characterized in that: The first deep groove ball bearing mechanism (31), the second deep groove ball bearing (32), the third deep groove ball bearing mechanism (33), the fourth deep groove ball bearing mechanism (34), the angular contact bearing mechanism (8) and the motor (5) are all connected to the base plate (91).

6. A zero backlash 90-degree double worm gear precision turntable as claimed in claim 4, characterized in that: The bottom plate (91) is fixed to the equipment base or the workbench through the second screw hole (982), four columns (94) are provided, and all are fixed to the four ends of the bottom plate (91) through the third screw hole, and the middle fixing plate (92) is connected to the columns (94) through the fourth screw hole.

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