Bevel Gear Backlash Adjustment Device

Abstract

The present invention discloses a backlash adjustment device for bevel gears, which comprises a driving bevel gear, a driven bevel gear, a driving bevel gear shaft, a driven bevel gear shaft, a transmission shaft, an intermediate shaft, an intermediate ring body, an intermediate cover plate, a sliding block, a backlash adjustment driving mechanism and a displacement mechanism for the driven bevel gear shaft. The driven bevel gear is vertically fixed to the lower end of the driven bevel gear shaft, and the driving bevel gear meshes with the driven bevel gear. The transmission shaft is fixedly connected to the flange at the upper end of the intermediate shaft. The lower end of the intermediate shaft extends into the center of the sliding block, and the driven bevel gear shaft is fixedly connected to the sliding block. The backlash adjustment driving mechanism is arranged between the intermediate ring body and the intermediate cover plate, and the displacement mechanism for the driven bevel gear shaft is arranged between the intermediate ring body, the intermediate cover plate and the sliding block. The present invention greatly improves the safety of the backlash adjustment operation of bevel gears, reduces the labor intensity, is very convenient to operate, and significantly improves the backlash adjustment accuracy and adjustment efficiency.

Description

Technical Field

[0001] The present invention relates to a mechanical transmission device, in particular to a device for improving the transmission accuracy of bevel gears, and belongs to the technical field of gear transmission. Background Art

[0002] Bevel gear transmission is a mechanical transmission component used to change the transmission direction and is widely used in various mechanical equipment and precision instruments. It is necessary to ensure the smoothness and reliability of bevel gear transmission to meet the requirements of its relatively high transmission accuracy. To achieve the above requirements, on the one hand, it is necessary to ensure the manufacturing accuracy of bevel gears, and on the other hand, it is also necessary to ensure their assembly accuracy. Tooth clearance, as an important assembly index for the meshing accuracy of a pair of bevel gears, has received extensive attention. In bevel gear transmission, too large tooth clearance will cause noise or unstable transmission and accelerate gear wear. At present, the adjustment of tooth clearance is carried out by using gaskets of different thicknesses. During the assembly process of a pair of bevel gears, in order to achieve the required tooth clearance, it is often necessary to remove the bevel gears from the gear shafts, replace them with appropriate adjustment gaskets, and then reassemble the bevel gears, which is time-consuming and laborious. At the same time, there are also potential safety hazards of injuring the human body and damaging parts during the disassembly and assembly of larger-sized bevel gears. Summary of the Invention

[0003] The purpose of the present invention is to provide a bevel gear tooth clearance adjustment device with a compact structure, simple installation, and convenient adjustment.

[0004] The present invention is realized through the following technical solutions:

[0005] A bevel gear tooth clearance adjustment device includes a cylindrical gear, a driving bevel gear, a driven bevel gear, a driving bevel gear shaft, a driven bevel gear shaft, a transmission shaft, an intermediate shaft, an intermediate ring body, an intermediate cover plate, a slider, a tooth clearance adjustment driving mechanism, and a driven bevel gear shaft displacement mechanism. The cylindrical gear is fixed at one end of the driving bevel gear. The driving bevel gear is horizontally supported at one end of the driving bevel gear shaft through a sliding bearing. The other end of the driving bevel gear shaft is supported on a side wall of the transmission housing. The driven bevel gear is vertically fixed at the lower end of the driven bevel gear shaft. The driving bevel gear and the driven bevel gear are respectively locked through their corresponding locking nuts, and the driving bevel gear meshes with the driven bevel gear. The upper end of the transmission shaft extends into the output transmission box on the upper side of the transmission housing. The lower end flange of the transmission shaft is positioned on the upper end flange of the intermediate shaft and is fixedly connected to the upper end flange of the intermediate shaft. The lower end of the intermediate shaft sequentially passes through the fixedly connected intermediate ring body and the intermediate cover plate and then extends into the center of the slider. The upper end flange of the driven bevel gear shaft is positioned on the lower side of the slider and is fixedly connected to the slider. The tooth clearance adjustment driving mechanism is arranged between the intermediate ring body and the intermediate cover plate, and the driven bevel gear shaft displacement mechanism is arranged between the intermediate ring body, the intermediate cover plate, and the slider.

[0006] The object of the present invention can also be further achieved by the following technical measures.

[0007] Furthermore, the backlash adjustment drive mechanism includes a drive worm, a worm wheel, an inclined support rod and a drive gear shaft. One end of the intermediate ring body is provided with a counterbore, the intermediate cover plate is of an annular structure, and the intermediate cover plate is provided with a through hole matching the counterbore of the intermediate ring body; one end of the drive worm is supported between the adjacent annular surfaces of the intermediate ring body and the intermediate cover plate, the other end of the drive worm is supported on one end of the inclined support rod, the other end of the inclined support rod is welded and fixed on the counterbore ring surface of the intermediate ring body and is adjacent to the intermediate cover plate; the worm wheel is fixed in the middle of the drive gear shaft, and the middle of the drive worm meshes with the worm wheel; the drive gear shaft and the driven bevel gear shaft displacement mechanism are evenly distributed on the intermediate cover plate and the slider; the lower flange of the transmission shaft is positioned and fixed on the upper flange of the intermediate shaft.

[0008] Furthermore, the driven bevel gear shaft displacement mechanism includes a synchronous gear ring, several gear shafts and several gear shaft retaining rings. The gear shafts have the same structure as the drive gear shaft, and the gear shafts and the drive gear shaft are radially evenly distributed on the upper flange of the intermediate shaft, the intermediate cover plate and the slider; the upper ends of the gear shafts and the upper end of the drive gear shaft respectively extend radially out to form support ends, and both sides of the support ends are respectively supported between the counterbore of the upper flange of the intermediate shaft and the adjacent counterbore of the intermediate ring body; the lower ends of the gear shafts and the lower end of the drive gear shaft respectively pass through the intermediate ring body and are screwed into the respective corresponding threaded holes on one side of the slider; the synchronous gear ring is sleeved into the counterbore of the intermediate ring body and is axially limited by the retaining rings fixed at the lower ends of the gears in the middle of the gear shafts; the gears in the middle of the gear shafts and the gears in the middle of the drive gear shaft respectively mesh with the synchronous gear ring.

[0009] Furthermore, one end of the drive worm extends radially to form a cylindrical head with an internal hexagonal counterbore on the end face. A shoulder extends radially from the drive worm adjacent to the cylindrical head. The cylindrical head, the shoulder and one end rod part of the drive worm are respectively embedded in the corresponding semi-circular grooves on the adjacent outer edges of the intermediate ring body and the intermediate cover plate.

[0010] Furthermore, the lower end of the intermediate shaft is a spline shaft, and the slider is provided with a spline hole in the center. The spline shaft and the spline hole are in clearance fit; the type of the clearance fit between the spline shaft and the spline hole is H7 / f7.

[0011] Furthermore, the bevel gear backlash adjustment range is from 0.1 mm to 0.5 mm.

[0012] Furthermore, both sides of the support end are respectively supported between the counterbore on one side of the upper flange of the intermediate shaft and the counterbore on one side of the adjacent intermediate ring body through several balls.

[0013] Further, the docking plane between the transmission shaft and the intermediate shaft is positioned by the clearance fit between the central boss extending downward from the center of the flange at the lower end of the transmission shaft and the central counterbore of the flange at the upper end of the intermediate shaft. The upper flange of the driven bevel gear shaft and the slider are positioned by a pair of cylindrical pins.

[0014] Further, the external threads of the stud at the lower end of the gear shaft, the external threads of the stud at the lower end of the driving gear shaft, and the internal threads of the threaded holes on the upper side of the slider are all fine-pitch threads with a pitch less than or equal to 1 mm.

[0015] During the operation of the present invention, only an inner hexagon wrench needs to be inserted into the inner hexagon counterbore at one end of the driving worm to rotate the driving worm. The driving worm drives the meshing worm wheel to rotate, thereby driving the driving gear shaft to rotate. Then, the synchronous gear ring is driven to rotate by the gear in the middle of the driving gear shaft. The synchronous gear ring drives several gear shafts to rotate synchronously with the driving gear shaft. Then, through the screw drive between the other end of the gear shaft and the other end of the driving gear shaft and the slider, and then the slider drives the driven bevel gear shaft fixedly connected thereto to move axially, thereby driving the driven bevel gear fixed on the driven bevel gear shaft to move axially to adjust the backlash between the driven bevel gear and the driving bevel gear. The present invention does not need to disassemble and assemble the bevel gear to adjust the backlash of the bevel gear, which greatly improves the safety of the backlash adjustment operation of the bevel gear, reduces the labor intensity, and is very convenient to operate. Due to the large speed ratio of the worm and worm wheel drive, when the worm rotates one circle, the worm wheel only rotates the central angle of one tooth, and the screw drive between the driving gear shaft, several gear shafts and the slider is a fine-pitch thread drive with a pitch of 1 mm or less, so that the backlash adjustment accuracy between the driven bevel gear and the driving bevel gear can reach 0.05 mm, significantly improving the backlash adjustment accuracy and adjustment efficiency. The present invention utilizes the self-locking performance of the worm and worm wheel drive to ensure the stability and reliability of the backlash adjustment of the bevel gear.

[0016] The advantages and features of the present invention will be illustrated and explained by the non-restrictive description of the following preferred embodiments, which are given only as examples with reference to the accompanying drawings. Brief Description of the Drawings

[0017] Figure 1 is the structural diagram of the present invention installed on a marine diesel engine governor;

[0018] Figure 2 is Figure 1 the enlarged A-A sectional view of

[0019] Figure 3 is Figure 2 the B-B sectional view of

[0020] Figure 4 is Figure 2 the C-C sectional view of Detailed Description of the Preferred Embodiments

[0021] The present invention will be further described below in conjunction with the accompanying drawings and an embodiment in which the present invention is installed on a marine diesel engine governor.

[0022] As Figures 1 to 4 shown, this embodiment includes a cylindrical gear 20, a driving bevel gear 1, a driven bevel gear 2, a driving bevel gear shaft 3, a driven bevel gear shaft 4, a transmission shaft 5, an intermediate shaft 6, an intermediate ring body 7, an intermediate cover plate 8, a slider 9, a backlash adjustment driving mechanism 10 and a displacement mechanism 11 for the driven bevel gear shaft. The cylindrical gear 20 is fixed to the left end of the driving bevel gear 1 by a first flat key 201. The driving bevel gear 1 is horizontally supported on the right end of the driving bevel gear shaft 3 by a sliding bearing 11. The left end of the driving bevel gear shaft 3 is supported on the left side wall 301 of the transmission box body 30. The driven bevel gear 2 is vertically fixed to the lower end of the driven bevel gear shaft 4 by a second flat key 21. The driving bevel gear 3 and the driven bevel gear 4 are meshed and locked by respective locking nuts 31. The upper end of the transmission shaft 5 extends into the output transmission box 40 on the upper side of the transmission box body 30. The positioning between the docking plane of the transmission shaft 5 and the intermediate shaft 6 is obtained through the clearance fit between the central boss 511 extending downward from the center of the lower flange 51 of the transmission shaft and the central counterbore 611 of the upper flange 61 of the intermediate shaft, which improves the coaxiality of the connection of the transmission shaft 5. The lower flange 51 of the transmission shaft and the upper flange 61 of the intermediate shaft are fixedly connected into one body by 4 fastening screws 52. The upper flange 41 of the driven bevel gear shaft and the slider 9 are positioned by a pair of cylindrical pins 42 and fixedly connected into one body by 4 fastening screws 52.

[0023] The lower end of the intermediate shaft 6 sequentially passes through the intermediate ring body 7 and the intermediate cover plate 8 fixedly connected by screws 82. The spline shaft 62 at the lower end of the intermediate shaft 6 extends into the spline hole 91 of the slider 9. The spline shaft 62 and the spline hole 91 are in clearance fit, and the type of their clearance fit is H7 / f7, which significantly improves the movement accuracy of the slider 9, and further improves the movement accuracy of the driven bevel gear 2 through the driven bevel gear shaft 4.

[0024] The backlash adjustment drive mechanism 10 is arranged between the intermediate ring body 7 and the intermediate cover plate 8. It includes a drive worm 101, a worm gear 102, an inclined support rod 103, and a drive gear shaft 104. A counterbore 71 is provided at the lower end of the intermediate ring body 7. The intermediate cover plate 8 is of an annular structure and is provided with a through hole 81 matching the counterbore 71 of the intermediate ring body 7. One end of the drive worm 101 is supported between the adjacent annular surfaces of the intermediate ring body 7 and the intermediate cover plate 8, and the other end of the drive worm 101 is supported on one end of the inclined support rod 103. The other end of the inclined support rod 103 is welded and fixed on the annular surface of the counterbore 71 of the intermediate ring body 7 and is adjacent to the intermediate cover plate 8. The worm gear 102 is fixed in the middle of the drive gear shaft 104, and the middle part of the drive worm 101 meshes with the worm gear 102. One end of the drive worm 101 radially extends into a cylindrical head 1011 with an internal hexagonal counterbore on the end face. A shoulder 1012 radially extends from the drive worm 101 adjacent to the cylindrical head. The cylindrical head 1011, the shoulder 1012, and the rod part of one end of the drive worm 101 are respectively embedded in the corresponding semi-circular grooves on the adjacent surfaces of the outer edges of the intermediate ring body 7 and the intermediate cover plate 8. Such a structure not only facilitates the installation of the drive worm 101 but also facilitates the smooth operation of the drive worm 101.

[0025] The driven bevel gear shaft displacement mechanism 11 includes a synchronous gear ring 111, three gear shafts 112, and three gear shaft retaining rings 113. The structure of the gear shaft 112 is the same as that of the drive gear shaft 104. The gear shafts 112 and the drive gear shaft 104 are radially distributed on the upper flange 61 of the intermediate shaft, the intermediate cover plate 8, and the slider 9. Support ends 1121 radially extend from the upper ends of the gear shafts 112 and the upper end of the drive gear shaft 104 respectively. The two sides of the support ends 1121 are respectively supported by several ball bearings 114 between a counterbore 612 on one side of the upper flange of the intermediate shaft and a counterbore 72 on one side of the adjacent intermediate ring body, facilitating the synchronous and flexible rotation of the drive gear shaft 104 and the three gear shafts 112.

[0026] The stud 1123 at the lower end of the gear shaft and the stud 1042 at the lower end of the drive gear shaft respectively pass through the intermediate ring body 7 and are screwed into the corresponding threaded holes 92 on one side of the slider 9. The synchronous gear ring 111 is sleeved into the counterbore 71 of the intermediate ring body 7 and is axially limited by the retaining ring 113 fixed at the lower end of the gear 1122 in the middle of the gear shaft. The gear 1122 in the middle of the gear shaft and the gear 1041 in the middle of the drive gear shaft respectively mesh with the synchronous gear ring 111. When the gear 1041 in the middle of the drive gear shaft rotates driven by the worm gear 102, it drives the three gear shafts 112 to rotate synchronously through the synchronous gear ring 111, thereby driving the slider 9, the driven bevel gear shaft 4, and the driven bevel gear 2 to move slightly, completing the backlash adjustment between the driven bevel gear 2 and the driving bevel gear 1. The backlash adjustment range of the bevel gears in this embodiment is from 0.1 mm to 0.5 mm.

[0027] The external threads of the stud 1123 at the lower end of the gear shaft and the external threads of the stud 1042 at the lower end of the drive gear shaft, as well as the internal threads of each threaded hole 92 on the upper side of the slider 9, are all fine-pitch threads with a pitch less than or equal to 1 mm, which can achieve fine adjustment of the backlash of the bevel gears. Taking the transmission ratio i = 20 of the driving worm 101 and the worm gear 102 in this embodiment as an example, when the driving worm 101 rotates one circle, the worm gear 102 rotates 1 / 20 circle. At this time, the drive gear shaft 104 and the three gear shafts 112 also rotate 1 / 20 circle synchronously, driving the driven bevel gear 2 to move 0.05 mm. The minimum distance that the driven bevel gear 2 moves is 0.05 mm, so that the accurate adjustment of the backlash between the driving bevel gear 1 and the driven bevel gear 2 can be realized, and the adjustment accuracy of the backlash of the bevel gears is significantly improved.

[0028] In addition to the above embodiments, the present invention can also have other implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A backlash adjustment device for bevel gears, comprising a driving spur gear, a driving bevel gear, a driven bevel gear, a driving bevel gear shaft and a driven bevel gear shaft. The driving spur gear is fixed to one end of the driving bevel gear. The driving bevel gear is horizontally supported on one end of the driving bevel gear shaft through a sliding bearing. The other end of the driving bevel gear shaft is supported on one side wall of the transmission housing. The driven bevel gear is fixed to the lower end of the driven bevel gear shaft. The driving bevel gear and the driven bevel gear are respectively locked by their corresponding locking nuts, and the driving bevel gear meshes with the driven bevel gear; characterized in that, It further includes a transmission shaft, an intermediate shaft, an intermediate ring body, an intermediate cover plate, a slider, a backlash adjustment drive mechanism, and a driven bevel gear shaft displacement mechanism. The upper end of the transmission shaft extends into the output transmission box on the upper side of the transmission box body. The flange at the lower end of the transmission shaft is fixedly connected in a positioning manner with the flange at the upper end of the intermediate shaft. The lower end of the intermediate shaft sequentially passes through the fixedly connected intermediate ring body and intermediate cover plate and then extends into the center of the slider. The flange at the upper end of the driven bevel gear shaft is fixedly connected in a positioning manner with the lower side of the slider. The backlash adjustment drive mechanism is arranged between the intermediate ring body and the intermediate cover plate, and the driven bevel gear shaft displacement mechanism is arranged among the intermediate ring body, the intermediate cover plate, and the slider. The backlash adjustment drive mechanism includes a drive worm, a worm gear, an inclined support rod, and a drive gear shaft. A counterbore is provided at one end of the intermediate ring body. The intermediate cover plate is of a flange structure and is provided with a through hole matching the counterbore of the intermediate ring body. One end of the drive worm is supported between the adjacent ring surfaces of the intermediate ring body and the intermediate cover plate. The other end of the drive worm is supported on one end of the inclined support rod. The other end of the inclined support rod is welded and fixed on the ring surface of the counterbore of the intermediate ring body and is adjacent to the intermediate cover plate. The worm gear is fixed in the middle of the gear shaft, and the middle part of the drive worm meshes with the worm gear. The driven bevel gear shaft displacement mechanisms are evenly distributed on the intermediate cover plate and the slider. The flange at the lower end of the transmission shaft is positioned and fixed on the flange at the upper end of the intermediate shaft. The driven bevel gear shaft displacement mechanism includes a synchronous gear ring, several gear shafts, and several gear shaft retaining rings. The gear shafts have the same structure as the drive gear shaft. The gear shafts and the drive gear shaft are radially distributed on the intermediate cover plate and the slider. The upper ends of the gear shafts and the upper end of the drive gear shaft respectively extend radially to form support ends. The two sides of the support ends are respectively supported between a counterbore on one side of the upper flange of the intermediate shaft and a counterbore on one side of the adjacent intermediate ring body. The lower ends of the gear shafts and the lower end of the drive gear shaft respectively pass through the intermediate ring body and are then screwed into the respective corresponding threaded holes on one side of the slider. The synchronous gear ring is sleeved in the counterbore of the intermediate ring body, and the retaining ring fixed to the lower end of the gear in the middle of the gear shaft axially limits the synchronous gear ring. The gears in the middle of the gear shafts and the gear in the middle of the drive gear shaft respectively mesh with the synchronous gear ring. The positioning between the butting plane of the transmission shaft and the intermediate shaft is obtained through the clearance fit between the center boss extending downward from the center of the flange at the lower end of the transmission shaft and the center counterbore of the flange at the upper end of the intermediate shaft. The flange at the upper end of the driven bevel gear shaft and the slider are positioned by a pair of cylindrical pins.

2. The backlash adjusting device for bevel gears according to claim 1, characterized in that, One end of the drive worm extends radially to form a cylindrical head with an internal hexagonal counterbore on the end face. A shoulder extends radially from the drive worm adjacent to the cylindrical head. The cylindrical head, the shoulder, and one end rod part of the drive worm are respectively embedded in the corresponding semi-circular grooves on the adjacent outer faces of the intermediate ring body and the intermediate cover plate.

3. The backlash adjustment device for bevel gears according to claim 1, characterized in that, The lower end of the intermediate shaft is of a spline structure, and the center of the slider is provided with a spline hole. The spline and the spline hole are in clearance fit. The type of the clearance fit between the spline and the spline hole is H7 / f7.

4. The backlash adjustment device for bevel gears according to claim 1, characterized in that, The adjustment range of the bevel gear backlash is from 0.1 mm to 0.5 mm.

5. The backlash adjusting device for bevel gears according to claim 1, characterized in that The two sides of the support end are respectively supported between a counterbore on one side of the upper flange of the intermediate shaft and a counterbore on one side of the adjacent intermediate ring body through several ball bearings.

6. The backlash adjusting device for bevel gears according to claim 1, characterized in that, The external threads of the studs at the lower end of the gear shaft and the drive gear shaft, as well as the internal threads of the threaded holes on the upper side of the slider, are all fine-pitch threads with a pitch less than or equal to 1 mm.

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