Flexible structure for reducing transmission clearance of helical gear and use method of flexible structure

Abstract

The invention discloses a flexible structure for reducing a bevel gear transmission gap and a using method thereof.The flexible structure comprises four bolts, a left thin gear and a right thin gear are coupled, keys are arranged between the left thin gear and a shaft and between the right thin gear and the shaft respectively, four first inner threaded holes are formed in the left thin gear in the circumferential direction, and four second inner threaded holes are formed in the right thin gear in the circumferential direction; four first inner threaded holes are formed in the left thin gear in the circumferential direction, four second inner threaded holes are formed in the right thin gear in the circumferential direction, each first inner threaded hole in the left thin gear is opposite to one second inner threaded hole in the right thin gear, the first inner threaded holes and the second inner threaded holes opposite to the first inner threaded holes form a threaded hole set, and a bolt is installed on each threaded hole set. The left portion of each bolt is located in the first inner threaded hole, the right portion of each bolt is located in the second inner threaded hole, at least one synchronous belt wheel is arranged at the left end of each bolt, and a synchronous belt is installed on the synchronous belt wheels of the four bolts. The flexible structure has the advantages of an existing traditional adjusting method.

Description

Technical Field

[0001] The invention belongs to the technical field of gear transmission, and in particular relates to a flexible structure for reducing the transmission gap of a helical gear and a use method thereof. Background Art

[0002] In the application of CNC machine tools, due to the unavoidable gap in the gear motion pair of mechanical transmission, the reverse feed lags behind the command signal, thereby reducing the processing accuracy of CNC machine tools; during the operation of submarines, due to the gap in gear transmission, the noise becomes louder, which increases the risk of being detected by the enemy. For a long time, people have used various methods to reduce the gear transmission gap, thereby improving the processing accuracy of CNC machine tools and reducing gear transmission noise. The current common method is to use the rigid adjustment method of adjusting the thickness of the gasket, which is difficult and inconvenient to adjust. The spring flexible adjustment method has the defect of small transmission load and is not easily accepted by people.

[0003] The basic structure of the traditional cylindrical helical gear transmission pair to reduce the tooth side clearance is as follows Figure 1 As shown, there is one driving thick bevel gear 10, and two driven thin bevel gears (thin gear 20 on the left and thin gear 30 on the right). When the end faces of the two thin bevel gears are close together, the tooth profiles of the two thin bevel gears are collinear. At this time, the two thin bevel gears are equivalent to one thick bevel gear, and the transmission tooth side clearance will inevitably exist. In order to reduce the many problems caused by the tooth side clearance t, in the early stage, a gasket of moderate thickness was installed between the two thin bevel gears, or a tension spring was installed on the end face of one of the thin bevel gears, so that the tooth profiles of the two thin bevel gears were staggered, and different tooth sides of the thick bevel gear 10 were used to contact different tooth sides of the two thin bevel gears, thereby achieving the purpose of reducing the tooth side clearance of the cylindrical bevel gear transmission. However, the rigid gap adjustment method of adding a gasket will cause the adjustment to be time-consuming and labor-intensive, and the cost will increase after the transmission gear is worn and the tooth side clearance becomes larger; the flexible gap adjustment method of adding a tension spring will cause the spring tension to be insufficient to resist the expected adjustment caused by the transmission load when the transmission load becomes larger, resulting in the phenomenon of being destroyed. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a flexible structure for reducing the transmission clearance of helical gears. The flexible structure reduces the transmission tooth side clearance of double-piece thin helical gears and uses a quick adjustment method of flexible adjustment to achieve the effect of synchronizing the transmission load with the rigid adjustment method.

[0005] Another object of the present invention is to provide a method for using the flexible structure for reducing the transmission gap of the helical gear.

[0006] The purpose of the present invention is achieved through the following technical solutions.

[0007] A flexible structure for reducing the transmission gap of a helical gear comprises: four bolts, a left thin gear and a right thin gear are identical and arranged in parallel, the left thin gear and the right thin gear are axially connected, a key is arranged between the left thin gear and the right thin gear and the shaft respectively, four first internal threaded holes are formed on the left thin gear along the circumferential direction, and four second internal threaded holes are formed on the right thin gear along the circumferential direction, the internal thread of the first internal threaded hole is left-handed, and the internal thread of the second internal threaded hole is right-handed, each first internal threaded hole on the left thin gear is opposite to a second internal threaded hole on the right thin gear, the first internal threaded hole and the second internal threaded hole opposite thereto form a group of threaded hole groups, a bolt is installed on each threaded hole group, a left-handed external thread is formed on the left part of the bolt, and a right-handed external thread is formed on the right part of the bolt, the left part of each bolt is located in the first internal threaded hole, and the right part of each bolt is located in the second internal threaded hole, at least one synchronous belt wheel is arranged on the left end of each bolt, and a synchronous belt is installed on the synchronous belt wheels of the four bolts.

[0008] The method for using a flexible structure for reducing the transmission clearance of helical gears comprises: rotating one of the bolts and the synchronous belt wheel thereon so that the synchronous belt drives the other three bolts to rotate synchronously, thereby enabling the left thin gear and the right thin gear to achieve axial displacement as required, so that the tooth profile lines of the double-piece thin gears are staggered by a suitable distance, thereby reducing the tooth side clearance.

[0009] In the above technical solution, locking nuts are installed at both ends of each bolt, the internal thread of the locking nut at the left end of the bolt is left-handed, and the internal thread of the locking nut at the right end of the bolt is right-handed.

[0010] In the above technical solution, a standard hexagonal hole is formed on the left end surface of at least one bolt.

[0011] In the above technical solution, the number of synchronous pulleys for the first and last bolts connected to the synchronous belt is one each, and the number of synchronous pulleys for the two middle bolts connected to the synchronous belt is two each.

[0012] In the above technical solution, the four first internal threaded holes are evenly distributed on the left thin gear along the circumferential direction.

[0013] In the above technical solution, the four second internal threaded holes are evenly distributed on the right thin gear along the circumferential direction.

[0014] When the bolt is rotated, the two thin gears (left thin gear and right thin gear) connected to the bolt will move toward each other, so as to adjust the tooth side clearance of the two thin gears and the thick gear transmission, which improves the time-consuming and labor-intensive rigid adjustment method of installing gaskets between thin gears. Whether in the initial adjustment or when the gear transmission has been used for a period of time and the clearance becomes larger and needs to be readjusted, the tooth side clearance can be easily adjusted by rotating one of the bolts; at the same time, it also eliminates the application of the flexible adjustment method of adjusting the position between the two thin gears by stretching the spring to improve the clearance, which cannot transmit large torque. The flexible structure for reducing the clearance of the helical gear transmission of the present invention can achieve flexible adjustment of the tooth side clearance of the helical gear transmission, and has the advantages of the existing traditional adjustment methods, and the use effect is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The basic structure for reducing the tooth side clearance of the traditional cylindrical helical gear transmission pair;

[0016] Figure 2 Schematic diagram of the structure of the flexible structure for reducing the transmission gap of the helical gear.

[0017] Among them, 10: thick gear, 20: thin gear on the left, 30: thin gear on the right, 40: key, 50: bolt, 60: synchronous pulley, 70: synchronous belt, 80: locking nut. DETAILED DESCRIPTION

[0018] The flexible structure for reducing the transmission gap of the helical gear of the present invention is described in detail below with reference to the accompanying drawings.

[0019] Example 1

[0020] like Figure 2As shown, a flexible structure for reducing the transmission gap of helical gears includes: four bolts 50, the left thin gear 20 and the right thin gear 20 are identical and arranged in parallel, the left thin gear 20 and the right thin gear 20 are axially connected, the left thin gear 20 and the right thin gear 20 are respectively provided with a key 40 between the shaft, four first internal thread holes are formed on the left thin gear 20 along the circumferential direction, and four second internal thread holes are formed on the right thin gear 20 along the circumferential direction, the internal thread of the first internal thread hole is left-handed, and the internal thread of the second internal thread hole is right-handed, and each of the first internal thread holes on the left thin gear 20 is provided with a key 40 between the left thin gear 20 and the shaft. An internal threaded hole is opposite to a second internal threaded hole on the right thin gear 20, and the first internal threaded hole and the second internal threaded hole opposite thereto form a group of threaded hole groups, and a bolt 50 is installed on each threaded hole group. A left-handed external thread is formed on the left portion of the bolt 50, and a right-handed external thread is formed on the right portion of the bolt 50. The left portion of each bolt 50 is located in the first internal threaded hole, and the right portion of each bolt 50 is located in the second internal threaded hole. At least one synchronous pulley 60 is provided at the left end of each bolt 50, and a synchronous belt 70 is installed on the synchronous pulleys 60 of the four bolts 50.

[0021] The method for using the flexible structure for reducing the transmission gap of the helical gear includes: rotating one of the bolts 50 and the synchronous pulley 60 thereon, so that the synchronous belt 70 drives the other three bolts 50 to rotate synchronously, so that the double-piece thin gear (the left thin gear 20 and the right thin gear 20) can achieve axial displacement as required, so that the tooth profile lines of the double-piece thin gear are staggered by a suitable distance, thereby reducing the tooth side gap. When the transmission gap needs to be adjusted due to wear after a period of use, the flexible structure for reducing the transmission gap of the helical gear of the present invention can be adjusted very conveniently and quickly, and the transmission load is much larger than the traditional spring flexible adjustment method, and the transmission effect is good.

[0022] Example 2

[0023] A flexible structure for reducing the transmission clearance of helical gears, based on Example 1, a locking nut 80 is installed at both ends of each bolt 50, the internal thread of the locking nut 80 at the left end of the bolt 50 is left-handed, and the internal thread of the locking nut 80 at the right end of the bolt 50 is right-handed. When the tooth side clearance is adjusted appropriately, the correct position required for the double-piece thin gear transmission can be fixed by tightening the locking nut 80.

[0024] A standard hexagonal hole is formed on the left end surface of at least one bolt 50, so that the bolt 50 can be easily rotated using a hexagonal wrench.

[0025] The number of synchronous pulleys 60 for the first and last two bolts 50 connected by the synchronous belt 70 is one each, and the number of synchronous pulleys 60 for the middle two bolts 50 connected by the synchronous belt 70 is two each. That is, there are six synchronous pulleys 60 in total.

[0026] Use the key 40 to first open the distance between the left thin gear 20 and the right thin gear 20 to a distance greater than the length of the bolt 50, and then screw the bolt 50 from the middle of the left thin gear 20 and the right thin gear 20. After the head of the bolt 50 is exposed, install the synchronous pulley 60 and the synchronous belt 70. By rotating the bolt 50, the left thin gear 20 and the right thin gear 20 are attached to each other, and then install this part to the transmission working position with the thick gear 10. At this time, the tooth side clearance can be adjusted.

[0027] The four first internal thread holes are evenly distributed on the left thin gear 20 along the circumferential direction. The four second internal thread holes are evenly distributed on the right thin gear 20 along the circumferential direction.

[0028] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by those skilled in the art without inventive effort falls within the protection scope of the present invention.

Claims

1. A flexible structure for reducing the transmission gap of helical gears, characterized in that: include: Four bolts (50), the left thin gear (20) and the right thin gear (30) are identical and arranged in parallel, the left thin gear (20) and the right thin gear (30) are axially connected, and keys (40) are arranged between the left thin gear (20) and the right thin gear (30) and the shaft respectively, four first internal thread holes are formed along the circumferential direction on the left thin gear (20), and four second internal thread holes are formed along the circumferential direction on the right thin gear (30), the internal thread of the first internal thread hole is left-handed, and the internal thread of the second internal thread hole is right-handed, and each first internal thread hole on the left thin gear (20) is connected to the right thin gear ( The first internal threaded hole and the second internal threaded hole opposite thereto form a threaded hole group, and a bolt (50) is installed on each threaded hole group. The left portion of the bolt (50) is formed with a left-handed external thread, and the right portion of the bolt (50) is formed with a right-handed external thread. The left portion of each bolt (50) is located in the first internal threaded hole, and the right portion of each bolt (50) is located in the second internal threaded hole. At least one synchronous pulley (60) is provided at the left end of each bolt (50), and a synchronous belt (70) is installed on the synchronous pulleys (60) of the four bolts (50).

2. The flexible structure according to claim 1, characterized in that: A locking nut (80) is installed at both ends of each bolt (50), the internal thread of the locking nut (80) at the left end of the bolt (50) is left-handed, and the internal thread of the locking nut (80) at the right end of the bolt (50) is right-handed.

3. The flexible structure according to claim 1, characterized in that: A hexagonal hole is formed on the left end surface of at least one bolt (50).

4. The flexible structure according to claim 1, characterized in that: The number of synchronous pulleys (60) of the first and last bolts (50) connected by the synchronous belt (70) is one each, and the number of synchronous pulleys (60) of the middle two bolts (50) connected by the synchronous belt (70) is two each.

5. The flexible structure according to claim 1, characterized in that: The four first internal thread holes are evenly distributed on the left thin gear (20) along the circumferential direction.

6. The flexible structure according to claim 1, characterized in that: The four second internal thread holes are evenly distributed on the right thin gear (30) along the circumferential direction.

7. The method for using the flexible structure for reducing the transmission gap of helical gears as claimed in any one of claims 1 to 6, characterized in that: include: By rotating one of the bolts (50) and the synchronous belt wheel (60) thereon, the synchronous belt (70) drives the other three bolts (50) to rotate synchronously, so that the left thin gear (20) and the right thin gear (30) can achieve axial displacement as required, thereby reducing the tooth side clearance.

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