Dental bending handpiece and transmission structure thereof

Abstract

The application relates to the technical field of dental medical instruments, and particularly discloses a transmission structure of a dental bending handpiece, which comprises a handle main body, a bearing set, a connector shaft, a transmission shaft and a limiting piece which are installed in the handle main body, one end of the connector shaft is fixedly connected with a connector, the connector is in transmission connection with a driving device, the other end of the connector shaft is provided with a first gear, the first gear is rotatably supported by the bearing set, one end of the transmission shaft is provided with a second gear which is in mesh with the first gear, and the limiting piece can be matched with the bearing set to limit the movement of the first gear along the axial direction of the connector shaft. The application further discloses a dental bending handpiece. The dental bending handpiece and the transmission structure thereof can effectively limit the movement of the first gear along the axial direction of the connector shaft, so that the interference between the first gear and the second gear is prevented, and damage is avoided.

Description

Technical Field

[0001] This invention relates to the field of dental medical device technology, and in particular to a dental handpiece and its transmission structure. Background Technology

[0002] Dental handpieces are commonly used surgical instruments in clinical oral treatment, widely applied in procedures such as dental restoration, implantation, and tooth extraction. A dental handpiece typically contains a connector shaft and a drive shaft. One end of the connector shaft is connected to a motor via a connector, and the other end has a first gear. The end of the drive shaft has a second gear that meshes with the first gear. When using a dental handpiece, operator misoperation during motor insertion or removal, or accidental movement during use, can cause the first gear to move along the axis of the connector shaft. In severe cases, this can lead to interference and damage between the first and second gears. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems mentioned above, and provides a dental handpiece and its transmission structure, which can effectively limit the movement of the first gear along the axial direction of the connector shaft, thereby preventing interference and damage between the first gear and the second gear.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a transmission structure for a dental curved handpiece, comprising a handle body, and a bearing assembly, a connector shaft, a transmission shaft, and a limiting member installed within the handle body. One end of the connector shaft is fixedly connected to a connector, and the connector is connected to a drive device for transmission. A first gear is mounted on the other end of the connector shaft, and the first gear is rotatably supported by the bearing assembly. A second gear that meshes with the first gear is provided at one end of the transmission shaft. The limiting member can cooperate with the bearing assembly to limit the movement of the first gear along the axial direction of the connector shaft.

[0005] Preferably, the bearing assembly includes a first bearing, a bearing sleeve, and a second bearing. A gearbox housing is installed in the internal cavity of the handle body. The first bearing, the bearing sleeve, and the second bearing are sequentially installed in the cavity of the gearbox housing, and the bearing assembly is locked in the cavity by a locking member.

[0006] Preferably, the limiting component is a nut, which is threadedly connected and fastened to the first gear. The inner ring of the first bearing can abut against the first gear, and the nut can abut against the inner ring of the second bearing, so as to limit the movement of the first gear along the axial direction of the connector shaft.

[0007] Preferably, the limiting member is a limiting block, which is fixedly installed inside the handle body, and the edge of the limiting block is provided with a notch for the second gear to pass through. The inner ring of the first bearing can abut against one side of the first gear, and the limiting block can abut against the other side of the first gear, so as to limit the movement of the first gear along the axial direction of the connector shaft.

[0008] Preferably, the first gear includes a toothed portion and a shaft portion, the inner wall of the toothed portion is provided with teeth that mesh with the second gear, and the shaft portion is in transmission cooperation with the bearing assembly.

[0009] Preferably, a rubber ring that mates with the bearing assembly is fitted onto the shaft body.

[0010] Preferably, the connector shaft is provided with a clamping sleeve and a spring. The clamping sleeve is slidably fitted onto the connector shaft. One end of the spring abuts against the clamping sleeve, and the other end abuts against the connector. Under the action of the spring force, the clamping sleeve can abut against the inner ring of the second bearing.

[0011] Preferably, a long shaft sleeve is installed in the internal cavity of the handle body, and a third bearing and a fourth bearing are respectively installed at both ends of the long shaft sleeve. The drive shaft passes through the long shaft sleeve, and its two ends are respectively matched with the third bearing and the fourth bearing.

[0012] This application also discloses a dental handpiece, including any of the transmission structures described above.

[0013] Preferably, a dental handpiece of this application further includes a head body, with a nozzle at the end of the head body, a flow divider between the nozzle and the head body, a plurality of water outlet holes communicating with the flow divider on the nozzle, and a connecting part for connecting with the handle body on the side of the head body, with a mixing chamber on the connecting part, one side of the mixing chamber communicating with a water passage and an air passage, and the other side communicating with the flow divider through a channel.

[0014] The beneficial effects are as follows: Compared with the prior art, the dental curved handpiece and its transmission structure of the present invention, by setting a limiting member in the handle body and by having the limiting member cooperate with the bearing assembly to limit the first gear, can effectively limit the movement of the first gear along the axial direction of the connector shaft, thereby preventing interference and damage between the first gear and the second gear. Attached Figure Description

[0015] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0016] Figure 1 This is a schematic diagram of the internal structure of a dental handpiece according to this application;

[0017] Figure 2This is a structural schematic diagram of one embodiment of the limiting member;

[0018] Figure 3 for Figure 2 A disassembly diagram of the sleeve and spring in the middle;

[0019] Figure 4 This is a schematic diagram of another embodiment of the limiting member;

[0020] Figure 5 for Figure 4 A disassembly diagram of the sleeve and spring in the middle;

[0021] Figure 6 This is a structural schematic diagram of the limiting block from one perspective.

[0022] Figure 7 This is a structural schematic diagram of the limiting block from another perspective;

[0023] Figure 8 for Figure 1 Enlarged structural diagram at point A;

[0024] Figure 9 This is a schematic diagram of the nozzle structure;

[0025] Figure 10 This is a structural diagram of the main body of the machine head after the support base has been disassembled;

[0026] Figure 11 This is a cross-sectional view of the connection between the machine head body and the handle. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a central component. When a component is described as "connected to" another component, it can be directly connected to the other component or may have a central component. When a component is described as "set on" another component, it can be directly set on the other component or may have a central component. When a component is described as "set in the middle," it is not simply set in the exact center, as long as it is not set within the area defined by both ends being in the middle. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] like Figures 1 to 7 As shown, this application discloses a transmission structure for a dental curved handpiece, including a handle body 1, and a bearing assembly, a connector shaft 2, a transmission shaft 3, and a limiting member installed in the handle body 1. One end of the connector shaft 2 is fixedly connected to a connector 5, and the connector 5 is connected to a drive device for transmission, so as to drive the connector shaft 2 to rotate through the drive device. The other end of the connector shaft 2 is equipped with a first gear 6, which is rotatably supported by the bearing assembly. One end of the transmission shaft 3 is provided with a second gear 7 that meshes with the first gear 6. The limiting member can cooperate with the bearing assembly to limit the movement of the first gear 6 along the axial direction of the connector shaft 2.

[0031] The transmission structure of a dental handpiece of this application provides a limiting member in the handle body 1, which can cooperate with the bearing assembly to limit the movement of the first gear 6. This effectively restricts the movement of the first gear 6 along the axial direction of the connector shaft 2, thereby preventing interference and damage between the first gear 6 and the second gear 7.

[0032] Specifically, the bearing assembly used in this application may include a first bearing 8, a bearing sleeve 9, and a second bearing 10. The handle body 1 has an installation chamber, in which a gearbox housing 51 is installed. One side of the gearbox housing 51 has an opening for inserting the bearing assembly. The first bearing 8, the bearing sleeve 9, and the second bearing 10 are sequentially inserted into the installation cavity through the opening, and the outer rings of the first bearing 8, the bearing sleeve 9, and the second bearing 10 abut against each other in sequence. A locking member 11 can be installed at the opening of the gearbox housing 51 by means of a threaded connection. The locking member 11 locks and limits the bearing assembly to ensure the stability of the bearing assembly after installation.

[0033] It should be noted that the limiting component used in this application can have multiple implementations. In one implementation of the limiting component, the limiting component can be a nut 4. The inner ring of the first bearing 8 can abut against the first gear 6 to limit the movement of the first gear 6 towards the first bearing 8. The first gear 6 is provided with threads, and the nut 4 is tightened and fixed on the threads. When the first gear 6 does not move axially, the nut 4 does not abut against the inner ring of the second bearing 10. When the first gear 6 moves away from the first bearing 8, the nut 4 can abut against the inner ring of the second bearing 10, thereby limiting the movement of the first gear 6 away from the first bearing 8. Therefore, through the cooperation between the nut 4 and the bearing assembly, the movement of the first gear 6 along the axial direction of the connector shaft 2 can be limited.

[0034] In another embodiment of the limiting member, the limiting member can be a limiting block 50. The limiting block 50 can be fixedly installed in the handle body 1 by means of screws, threaded connections, or snap-fits. The edge of the limiting block 50 is provided with a fan-shaped notch 35 through which the second gear 7 passes, to prevent interference between the second gear 7 and the limiting block 50 during installation. The inner ring of the first bearing 8 can abut against one side of the first gear 6 to limit the movement of the first gear 6 towards the side facing the first bearing 8. The limiting block 50 is provided with a series of notches 35 facing the first gear 6. The first step 36, the second step 37, and the third step 38 are provided. The first step 36 is fixed in place with the handle body 1. When the first gear 6 does not move axially, the limiting block 50 does not abut against the first gear 6. When the first gear 6 moves away from the first bearing 8, the end face of the third step 38 can abut against the other side of the first gear 6, thereby restricting the movement of the first gear 6 away from the first bearing 8. Therefore, through the cooperation between the limiting block 50 and the bearing assembly, the movement of the first gear 6 along the axial direction of the connector shaft 2 can be limited.

[0035] Optionally, the first gear 6 of this application may include a toothed portion 12 and a shaft portion 13. Specifically, the toothed portion 12 may be annular, and the shaft portion 13 may be a cylindrical shaft. The toothed portion 12 and the shaft portion 13 are connected by a tapered portion. The inner wall of the toothed portion 12 is surrounded by teeth that mesh with the second gear 7. When the first gear 6 abuts against the first bearing 8, the tapered portion abuts against the inner ring of the first bearing 8 to limit the axial movement of the first gear 6 and ensure that the first gear 6 can rotate relative to the first bearing 8. The shaft portion 13 is driven by the bearing assembly. Specifically, the shaft portion 13 passes through the first bearing 8, the bearing sleeve 9, and the second bearing 10 in sequence and is fixedly connected to the connector shaft 2. Threads may be provided on the shaft portion 13 to facilitate the installation of the nut 4.

[0036] Furthermore, a rubber ring 14 that mates with the bearing assembly can be fitted onto the shaft body 13. Specifically, a groove is provided on the shaft body 13, and the rubber ring 14 is fitted onto the groove. Through the frictional engagement between the rubber ring 14 and the bearing assembly, the movement of the first gear 6 along the axial direction of the connector shaft 2 can be restricted to a certain extent.

[0037] In one embodiment of this application, a clamping sleeve 15 and a spring 16 may be provided on the connector shaft 2. The clamping sleeve 15 is slidably fitted on the connector shaft 2 and can move along the axial direction of the connector shaft 2. One end of the spring 16 abuts against the clamping sleeve 15, and the other end abuts against the connector 5. Under the action of the spring force 16, the clamping sleeve 15 can abut against the inner ring of the second bearing 10 to pre-tighten the inner ring of the first bearing 8, the bearing sleeve 9, and the inner ring of the second bearing 10. It should be noted that when a nut 4 is used as... When the limiting component is used, the outer wall of the nut 4 can be provided with multiple notches 39, and the tightening sleeve 15 is provided with multiple claws 40 corresponding to the notches 39. The multiple claws 40 can pass through the corresponding notches 39 and abut against the inner ring of the second bearing 10. When the first gear 6 moves away from the first bearing 8, under the action of the spring force of the spring 16, the multiple claws 40 of the tightening sleeve 15 can abut against the inner ring of the second bearing 10, thereby applying pressure to the inner ring of the second bearing 10 to pre-tighten the inner ring of the first bearing 8, the bearing sleeve 9, and the inner ring of the second bearing 10.

[0038] In another embodiment of this application, a long shaft sleeve 53 can be fixedly installed in the internal cavity of the handle body 1. A third bearing 17 and a fourth bearing 18 are respectively installed at both ends of the long shaft sleeve 53. The drive shaft 3 passes through the long shaft sleeve 53, and its two ends are respectively fitted with the third bearing 17 and the fourth bearing 18. During transmission, the drive shaft 3 withstands high rotational speed and large axial and radial forces. The third bearing 17 and the fourth bearing 18 rotatably support both ends of the drive shaft 3, effectively improving its service life. It should be noted that the third bearing 17 and the fourth bearing 18 in this application can be one or two.

[0039] like Figures 1 to 11 As shown, this application also discloses a dental handpiece, including any of the transmission structures described above.

[0040] The dental handpiece of this application provides a limiting member in the handle body 1, which can cooperate with the bearing assembly to limit the movement of the first gear 6. This effectively restricts the movement of the first gear 6 along the axial direction of the connector shaft 2, thereby preventing interference and damage between the first gear 6 and the second gear 7.

[0041] Furthermore, this application also improves the water-air passage structure in a dental curved handpiece. Specifically, a dental curved handpiece of this application further includes a head body 19 and a nozzle 20 disposed at the end of the head body 19. A flow divider 21 is provided between the nozzle 20 and the head body 19. The nozzle 20 is provided with a plurality of water outlet holes 22 communicating with the flow divider 21. A connecting portion 23 for connecting to the handle body 1 is provided on the side of the head body 19. The connecting portion 23 protrudes from the side of the head body 19 to form a... The structure is T-shaped. A mixing chamber 24 is provided on the connecting part 23. The mixing chamber 24 is located in a direction that is approximately parallel to the drive shaft 3 of the dental handpiece. One side of the mixing chamber 24 is connected to the water pipe 33 and the air pipe 34, and the other side is connected to the diversion chamber 21 through the channel 27. The channel 27 is inclined. After the liquid and gas in the water pipe 33 and the air pipe 34 flow into the mixing chamber 24 and are fully mixed, they flow into the diversion chamber 21 through the channel 27, and then flow out through several water outlet holes 22 on the nozzle 20.

[0042] Compared with the water channel 25 structure used in existing dental curved handpieces, the water-air passage structure of the present application only sets one diversion chamber 21 in the height direction of the handpiece body 19. The mixing chamber 24 is not set in the height direction of the handpiece body 19, but is set on the connecting part 23 on the side of the handpiece body 19. The mixing chamber 24 is connected to the diversion chamber 21 through the channel 27. The setting of water chamber and air chamber in the height direction of the handpiece body 19 is reduced, thereby reducing the height of the handpiece body 19. The structure is simple, the production cost is low, and it is convenient for dentists to perform dental operations and improves the treatment comfort of patients.

[0043] In one specific embodiment, the nozzle 20 can be annular, and a recess 28 is provided around the outer edge of the nozzle 20. The recess 28 can be spirally arranged around the outer edge of the nozzle 20, so that a spirally arranged flow-dividing cavity 21 is formed between the recess 28 and the inner wall of the head body 19. A plurality of water outlet holes 22 are evenly distributed around the end face of the nozzle 20 and are all connected to the flow-dividing cavity 21. After the water and air are mixed, they flow into the spirally arranged flow-dividing cavity 21 through the inclined channel 27. This can prevent the mixed water and air from flowing out directly from the water outlet holes 22 near the channel 27, so that the mixed water and air can flow out from each water outlet hole 22 as evenly as possible, thereby improving the uniformity of water output from the water outlet holes 22.

[0044] In this application, the nozzle 20 can be installed at the end of the head body 19 via a detachable structure, thereby facilitating the installation and removal of the nozzle 20. Specifically, in one installation method, the head body 19 is provided with a threaded mounting part, and the nozzle 20 is provided with an internal thread that mates with the threaded mounting part, so that the nozzle 20 can be detachably installed on the head body 19 via a threaded connection. In another installation method, a protruding post can be provided at the middle position of the end of the head body 19. The edge of the protruding post is provided with a slot. The nozzle 20 is annular and is fitted on the protruding post and embedded in the slot. A first sealing ring 29 is provided between the inner wall of the nozzle 20 and the protruding post. The first sealing ring 29 and the surface of the protruding post are frictionally engaged to improve the stability of the connection between the nozzle 20 and the protruding post. A first sealing ring 29 is also provided between the outer wall of the nozzle 20 and the wall of the slot to improve the sealing between the nozzle 20 and the slot. The recess 28 on the outer edge of the nozzle 20 and the slot form the flow divider 21.

[0045] In another embodiment, a support block 30 may be installed on the connecting part 23. The support block 30 is provided with a first through hole 25 and a second through hole 26. A second groove may be provided at the end of the first through hole 25 and the second through hole 26 away from the mixing chamber 24. A second sealing ring 32 is installed in the second groove. The water pipe 33 and the air pipe 34 are respectively inserted into the first through hole 25 and the second through hole 26. When the handle body 1 is connected to the connecting part 23, the handle body 1 and the support block 30 can simultaneously squeeze the second sealing ring 32, and the second sealing ring 32 is tightly fitted onto the water pipe. The water pipe 33 and the air pipe 34 are sealed with a second sealing ring 32 between the water pipe 33 and the second groove, between the water pipe 33 and the connecting part 23, between the air pipe 34 and the second groove, between the air pipe 34 and the connecting part 23, and between the connecting part 23 and the handle body 1, thereby improving the sealing performance between the handle body 1 and the connecting part 23, between the air pipe 34 and the connecting part 23, between the air pipe 34 and the second groove, between the water pipe 33 and the connecting part 23, and between the water pipe 34 and the second groove.

[0046] Specifically, the end of the connecting part 23 away from the machine head body 19 is provided with a mounting groove that communicates with the mixing chamber 24. The support block 30 is installed in the mounting groove and is sealed to the mounting groove by a sealing gasket 31 to improve the sealing performance between the support block 30 and the mounting groove. By providing a detachable support block 30 structure, it is convenient to process the mixing chamber 24 and the channel 27 inside the connecting part 23. Preferably, the edge of the support block 30 facing the mounting groove can be provided with a first groove, and the sealing gasket 31 is fitted into the first groove to facilitate the installation of the sealing gasket 31. At the same time, the outer edge of the sealing gasket 31 can be sealed to the groove wall of the mounting groove to improve the sealing performance between the sealing gasket 31 and the mounting groove.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of the technical solutions of the present invention.

Claims

1. A transmission structure for a dental handpiece, characterized in that, The device includes a handle body (1), a bearing assembly, a connector shaft (2), a transmission shaft (3), and a limiting member installed within the handle body (1). One end of the connector shaft (2) is fixedly connected to a connector (5), which is connected to a drive device. The other end of the connector shaft (2) is equipped with a first gear (6), which is rotatably supported by the bearing assembly. One end of the transmission shaft (3) is provided with a second gear (7) that meshes with the first gear (6). The limiting member can cooperate with the bearing assembly to limit the movement of the first gear (6) along the axial direction of the connector shaft (2). The bearing assembly includes a first bearing (8), a bearing sleeve (9), and a second bearing (10). A gearbox housing (51) is installed in the internal cavity of the handle body (1). The bearing (8), bearing sleeve (9), and second bearing (10) are installed in the cavity of the gearbox housing (51) in sequence, and the bearing assembly is locked in the cavity by the locking member (11). The limiting member is the nut (4), which is threadedly connected to the first gear (6). The inner ring of the first bearing (8) can abut against the first gear (6), and the nut (4) can abut against the inner ring of the second bearing (10) to limit the movement of the first gear (6) along the axial direction of the connector shaft (2). The first gear (6) includes a toothed part (12) and a shaft part (13). The inner wall of the toothed part (12) is provided with teeth that mesh with the second gear (7). The shaft part (13) is driven and cooperates with the bearing assembly. The shaft part (13) is provided with threads to facilitate the installation of the nut (4).

2. The transmission structure of a dental curved handpiece according to claim 1, characterized in that, The shaft body (13) is fitted with a rubber ring (14) that mates with the bearing assembly.

3. The transmission structure of a dental curved handpiece according to claim 1, characterized in that, The connector shaft (2) is provided with a clamping sleeve (15) and a spring (16). The clamping sleeve (15) is slidably fitted on the connector shaft (2). One end of the spring (16) abuts against the clamping sleeve (15) and the other end abuts against the connector (5). Under the action of the spring force (16), the clamping sleeve (15) can abut against the inner ring of the second bearing (10).

4. The transmission structure of a dental curved handpiece according to claim 1, characterized in that, The handle body (1) has a long shaft sleeve (53) installed in its internal cavity. The long shaft sleeve (53) has a third bearing (17) and a fourth bearing (18) installed at its two ends respectively. The drive shaft (3) passes through the long shaft sleeve (53) and is fitted with the third bearing (17) and the fourth bearing (18) at its two ends respectively.

5. A dental curved handpiece, characterized in that, Includes the transmission structure described in any one of claims 1-4.

6. A dental handpiece according to claim 5, characterized in that, It also includes a head body (19), with a nozzle (20) at the end of the head body (19). There is a flow divider (21) between the nozzle (20) and the head body (19). The nozzle (20) is provided with several water outlet holes (22) that connect to the flow divider (21). The side of the head body (19) is provided with a connecting part (23) for connecting to the handle body (1). A mixing chamber (24) is provided on the connecting part (23). One side of the mixing chamber (24) is connected to the water passage (25) and the air passage, and the other side is connected to the flow divider (21) through the channel (27).

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