A dual-gear backlash elimination device

Abstract

The present invention discloses a double-gear backlash elimination device, which relates to the field of precision transmission. It includes a motor output gear, a first drive gear set, a second drive gear set and a driven gear. The motor output gear is respectively meshed and connected to the driven gear through the first drive gear set and the second drive gear set. The first drive gear set includes a first drive gear and a second drive gear. The first drive gear is meshed and connected to the motor output gear, and the second drive gear is meshed and connected to the driven gear. A cylindrical protrusion is provided at the bottom of the first drive gear, a countersunk through hole is provided at the center of the first drive gear, and a locking mechanism is provided in the countersunk through hole. A plug-in groove is provided at the top of the second drive gear, and the first drive gear is plugged into the second drive gear through the locking mechanism. The present invention facilitates the installation and locking of gears, makes the transmission mechanism have no clearance, and can effectively improve the transmission accuracy.

Description

Technical Field

[0001] The present invention belongs to the field of precision transmission, and particularly relates to a double-gear backlash elimination device. Background Art

[0002] At present, most of the precision rotating shaft transmissions of numerical control machine tools use worm gears to drive, such as components like turntables and milling heads. Worm gear drive has certain limitations, such as: (1) there is reverse backlash, especially after long-term use, it becomes more serious; (2) the speed response is slow, and there will be tool joint marks when processing molds; (3) the price is expensive; (4) the installation control requirements are high; (5) the service life is short; (6) the positioning accuracy is low. Therefore, the confidential rotating shaft transmission of existing high-end numerical control machine tools uses double-gear drive, but gear drive cannot avoid gaps, and impacts are generated during movement, resulting in vibrations and noises, thereby reducing the transmission accuracy.

[0003] Therefore, how to set up a double-gear backlash elimination device that can be easily locked has become a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a double-gear backlash elimination device. The present invention adopts a double-gear group transmission mechanism, and realizes the rapid locking of the first driving gear and the second driving gear through a locking mechanism. The locking process is simple and convenient to operate, enabling a rigid connection to be formed between the two groups of driving gears and the motor output gear and the driven gear, eliminating gear gaps, and improving the transmission accuracy.

[0005] To achieve the above object, the present invention adopts the following technical solution: A double-gear backlash elimination device includes a motor output gear, a first driving gear group, a second driving gear group, and a driven gear. The motor output gear is respectively meshed and connected with the driven gear through the first driving gear group and the second driving gear group. The first driving gear group includes a first driving gear and a second driving gear. The first driving gear is meshed and connected with the motor output gear, and the second driving gear is meshed and connected with the driven gear. A cylindrical protrusion is provided at the bottom of the first driving gear, and a countersunk through-hole is provided at the center of the first driving gear. A locking mechanism is provided in the countersunk through-hole. A plug-in slot is provided at the top of the second driving gear, and the first driving gear is plugged into the second driving gear through the locking mechanism.

[0006] Further, the locking mechanism includes a set screw, a compression spring, a conical head, and a steel ball. Internal threads meshing with the set screw are provided in the countersunk through-hole. A guide rod is provided at the bottom end of the set screw. The compression spring is sleeved on the guide rod. The other end of the compression spring is provided with a conical head, and the conical head is slidably connected with the guide rod. Steel ball holes are evenly provided horizontally on the cylindrical protrusion, and the steel balls are provided in the steel ball holes.

[0007] Further, arc grooves are uniformly arranged on the conical surface of the conical head, wear-resistant rubber pads are arranged in the arc grooves, and the steel balls are abutted against the wear-resistant rubber pads.

[0008] Further, an inclined conical surface matched with the steel balls is arranged on the side wall of the insertion slot, and a guide hole is arranged at the bottom of the insertion slot.

[0009] Further, an adjusting gasket is further included, and the adjusting gasket is arranged in the insertion slot and is used for finely adjusting the distance between the first driving gear and the second driving gear.

[0010] Further, the second driving gear set has the same structure as the first driving gear set and is symmetrically arranged on the other side of the first driving gear set.

[0011] The beneficial effects of the present invention are as follows:

[0012] In the double-gear backlash elimination device of the present invention, power is respectively transmitted to the driven gear through two groups of driving gears. By screwing the setscrew to drive the compression spring to compress, and then the conical head squeezes the steel balls, the first driving gear and the second driving gear are quickly locked. The structure is simple and the operation is convenient. A rigid connection can be formed between the two driving gear sets and the gear shaft, so that there is no gap in the transmission mechanism, and the transmission accuracy can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the main structure of the present invention;

[0014] Figure 2 is a sectional view of the first driving gear set and the second driving gear set of the present invention;

[0015] Figure 3 is Figure 2 the partial enlarged view at A in

[0016] Figure 4 is a schematic diagram of the structure of the first driving gear;

[0017] Figure 5 is a schematic diagram of the structure of the conical head;

[0018] Figure 6 is a sectional view of the first driving gear;

[0019] Figure 7 is a schematic diagram of the structure of the adjusting gasket installed in the present invention.

[0020] In the figure: 1 - motor output gear; 2 - first driving gear; 3 - second driving gear; 4 - driven gear; 5 - countersunk through hole; 6 - setscrew; 7 - compression spring; 8 - conical head; 9 - steel ball; 10 - guide rod; 11 - steel ball hole; 12 - guide hole; 13 - adjusting gasket; 14 - arc groove; 15 - rubber pad. Detailed implementation mode

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention; the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In addition, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] Embodiment 1

[0024] As Figure 1-7 shown, the present invention discloses a double gear backlash elimination device, which includes a motor output gear 1, a first drive gear set, a second drive gear set and a driven gear 4. The motor output gear 1 is meshed and connected to the driven gear 4 through the first drive gear set and the second drive gear set. The first drive gear set includes a first drive gear 2 and a second drive gear 3. The first drive gear 2 is meshed and connected to the motor output gear 1, and the second drive gear 3 is meshed and connected to the driven gear 4. The second drive gear set has the same structure as the first drive gear set and is symmetrically arranged on the other side of the first drive gear set.

[0025] A countersunk through-hole 5 is provided at the center of the first driving gear 2. A locking mechanism is provided in the countersunk through-hole 5. The locking mechanism includes a setscrew 6, a compression spring 7, a conical head 8 and a steel ball 9. Internal threads matching the setscrew 6 are provided in the countersunk through-hole 5. A guide rod 10 is provided at the bottom end of the setscrew 6. The compression spring 7 is sleeved on the guide rod 10. The other end of the compression spring 7 is provided with a conical head 8. The end with a smaller inner diameter of the conical head 8 faces downward. The conical head 8 is slidably connected to the guide rod 10. Arc grooves 14 are evenly provided on the conical surface of the conical head 8. Wear-resistant rubber pads 15 are provided in the arc grooves 14. The steel balls 9 are abutted against the wear-resistant rubber pads 15. The arc grooves 14 are used for limiting the steel balls, so that the axial movement range of the steel balls is limited within the arc grooves 14. The setting of the wear-resistant rubber pads 15 is used to cooperate with the arc grooves 14 to lock the steel balls 9. A cylindrical protrusion is provided at the bottom of the first driving gear 2. Steel ball holes 11 are evenly provided horizontally on the cylindrical protrusion. The steel balls 9 are provided in the steel ball holes 11. A plug-in groove is provided at the top of the second driving gear 3. The first driving gear 2 is plugged into the second driving gear 3. An inclined cone surface matching the steel balls 9 is provided on the side wall of the plug-in groove. A guide hole 12 is provided at the bottom of the plug-in groove. The setting of the guide hole 12 can play a guiding role for the locking mechanism and also reserve a space for the guide rod 10 to penetrate deeply. When the setscrew 6 is turned by a hexagon wrench, the setscrew 6 moves downward, pushes the conical head 8 to descend through the compression spring 7, and the conical head 8 extrudes the steel balls 9 outward, causing the steel balls 9 to be locked on the inclined cone surface. The wear-resistant rubber pads 15 and the arc grooves 14 can strongly lock the steel balls 9, increasing the locking effect of the locking device, preventing the steel balls 9 from rotating when stressed, ensuring that the first driving gear 2 and the second driving gear 3 do not rotate relative to each other while transmitting power, and realizing the locking of the first driving gear 2 and the second driving gear 3. In the present invention, there is no need to set a tensioning sleeve, avoiding the need to turn multiple bolts when using a tensioning sleeve for fixation, with a cumbersome locking process, difficult to operate, and the position of the gears is likely to change during the locking process, which is not conducive to backlash elimination of the gears. The setting of the locking mechanism is simple and reasonable, facilitating the locking and disassembly between the driving gears. At the same time, all components used in the locking mechanism are common parts, facilitating replacement.

[0026] As Figure 6 shown, the present invention further includes an adjusting gasket 13. The adjusting gasket 13 is provided in the plug-in groove. The number of adjusting gaskets 13 can be increased or decreased according to the actual situation, and is used to finely adjust the distance between the first driving gear 2 and the second driving gear 3, ensuring that both the first driving gear 2 and the second driving gear 3 can effectively mesh with the motor output gear 1 and the driven gear 4.

[0027] The usage method of the present invention is as follows: First, insert the first driving gear 2 into the second driving gear 3 without locking it temporarily. Engage the first driving gear set with the motor output gear 1 and the driven gear 4, and rotate a certain angle to ensure that there is no clearance in the transmission system. Then, lock the first driving gear 2 on the second driving gear 3 with a hexagon wrench. Engage and lock the second driving group with the motor output gear 1 and the driven gear 4 in the same way. In this way, there is no clearance in the traditional device, and there is a constant pre-tightening force, that is, there is a constant pre-tightening force between the two channels, which can improve the transmission accuracy and reduce noise.

[0028] The above are only preferred embodiments of the present invention, and do not impose any limitation on the technical scope of the present invention. Therefore, any minor modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A double gear backlash elimination device, characterized in that, It includes a motor output gear, a first drive gear set, a second drive gear set and a driven gear. The motor output gear is meshed and connected to the driven gear through the first drive gear set and the second drive gear set respectively. The first drive gear set includes a first drive gear and a second drive gear. The first drive gear is meshed and connected to the motor output gear, and the second drive gear is meshed and connected to the driven gear. A cylindrical protrusion is provided at the bottom of the first drive gear, and a countersunk through hole is provided at the center of the first drive gear. A locking mechanism is provided in the countersunk through hole. A plugging groove is provided at the top of the second drive gear, and the first drive gear is plugged into the second drive gear through the locking mechanism; The locking mechanism includes a setscrew, a compression spring, a conical head and a steel ball. Internal threads meshing with the setscrew are provided in the countersunk through hole. A guide rod is provided at the bottom end of the setscrew. The compression spring is sleeved on the guide rod. The other end of the compression spring is provided with a conical head. The conical head is slidably connected to the guide rod. Steel ball holes are evenly provided in the transverse direction of the cylindrical protrusion, and the steel balls are provided in the steel ball holes; Arc grooves are evenly provided on the conical surface of the conical head, and rubber pads are provided in the arc grooves. The steel balls are abutted against the rubber pads; The side wall of the plugging groove is provided with an inclined conical surface cooperating with the steel ball, and a guiding hole is provided at the bottom of the plugging groove.

2. The double gear backlash elimination device according to claim 1, wherein It further includes an adjusting shim. The adjusting shim is provided in the plugging groove and is used for finely adjusting the distance between the first drive gear and the second drive gear.

3. A double gear backlash elimination device according to claim 1, characterized in that, The second drive gear set has the same structure as the first drive gear set and is symmetrically arranged on the other side of the first drive gear set.

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