End face logarithmic spiral oscillating tooth transmission device with adjustable backlash

Abstract

The invention provides an end face logarithmic spiral oscillating tooth transmission device with an adjustable backlash. The device comprises a transmission assembly. The shell allows the movable teeth to pass through; the lubricating assembly comprises an elastic telescopic piece and an abutting assembly, the elastic telescopic piece is arranged in the lubricating hole and can abut against the hole wall of the lubricating hole, one end of the abutting assembly is connected with the end of the elastic telescopic piece, the other end of the abutting assembly abuts against the shell, and the face, abutting against the shell, of the other end of the abutting assembly is an inclined face; wherein the area where the movable teeth rotate in the circumferential direction comprises a top area and a bottom area, and when the movable teeth drive the lubricating assembly to rotate in the bottom area, the lubricating assembly recovers deformation and extends so as to push the abutting assembly to get close to the inclined face, and a space is released for lubricating oil to enter the lubricating hole; when the movable teeth drive the lubricating assembly to rotate in the top area, the lubricating assembly is compressed by the inclined face, so that the elastic telescopic piece is shortened, and the abutting assembly moves into the lubricating hole to extrude lubricating oil in the lubricating hole and discharge the lubricating oil to the meshing tooth face of the inner gear ring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical transmission, in particular to a side gap adjustable end face logarithmic spiral movable tooth transmission device. BACKGROUND

[0002] The end face logarithmic spiral reducer has a wide application prospect due to its unique transmission characteristics, such as zero side gap (theoretically), compact structure, high load capacity, and large speed range. The meshing transmission between the movable tooth and the inner tooth ring is a key link to realize power transmission. Generally, the movable tooth and the inner tooth ring are made of materials with high rigidity to ensure the structural stability and transmission accuracy under high load conditions. Since there are many contact positions and a large contact area during the meshing process of the two, they are prone to generate large friction and wear during long-term operation, which puts high requirements on the lubrication conditions.

[0003] Currently, oil lubrication is a common means to improve the meshing performance of gears, reduce wear, and prolong the service life. However, in some specific structures of the transmission device, especially in the design where the inner tooth ring is fixed to the rack and the retainer operates at low speed, the supply of lubricating oil faces significant challenges. Since the retainer rotates at a low speed, its ability to carry lubricating oil is limited, making it difficult to effectively deliver lubricating oil to the upper region of the inner tooth ring. Under the condition of stable operation of the equipment without severe shaking, the lubricating oil mainly accumulates in the lower part of the inner tooth ring, resulting in insufficient lubrication in the upper region. This uneven lubrication phenomenon causes the movable tooth and the inner tooth ring to lack effective oil film protection in the upper meshing area, which further leads to local dry friction, abnormal wear, and even causes tooth surface gluing or pitting, seriously affecting the transmission accuracy and device reliability. SUMMARY

[0004] Therefore, the present application provides a side gap adjustable end face logarithmic spiral movable tooth transmission device, which overcomes the problem of lack of effective oil film protection in the upper meshing area of the movable tooth and the inner tooth ring, improves the transmission accuracy, and prolongs the service life of the device.

[0005] To achieve the above purpose, the present application provides the following technical solutions: A side gap adjustable end face logarithmic spiral movable tooth transmission device, comprising: a transmission assembly, including a movable tooth, a retainer rotating synchronously with the movable tooth, and an inner tooth ring meshing and transmitting with the movable tooth, the retainer being provided with a lubricating hole and a fixing hole allowing the movable tooth to pass through, the lubricating hole being located at the outer periphery of the fixing hole; a housing allowing the movable tooth to pass through; and The lubricating assembly comprises an elastic telescopic member and an abutting assembly, the elastic telescopic member is arranged in the lubricating hole and can abut against the hole wall of the lubricating hole, one end of the abutting assembly is connected with the end of the elastic telescopic member, and the other end of the abutting assembly abuts against the inclined surface, and the surface of the housing abutting against the other end is an inclined surface; The region where the movable tooth rotates in the circumferential direction comprises a top region and a bottom region. When the movable tooth drives the lubricating assembly to rotate in the bottom region, the lubricating assembly restores the deformation and is elongated to push the abutting assembly to move close to the inclined surface, so that the length of the abutting assembly in the lubricating hole is reduced to release space for the lubricating oil to enter the lubricating hole. When the movable tooth drives the lubricating assembly to rotate in the top region, the lubricating assembly is compressed by the inclined surface, so that the elastic telescopic member is shortened, and the abutting assembly moves into the lubricating hole, so that the length of the abutting assembly in the lubricating hole is increased to squeeze the lubricating oil in the lubricating hole and make it discharge to the meshing tooth surface of the inner gear ring.

[0006] Optionally, in the side gap adjustable end face pair number spiral movable tooth transmission device, the lubricating assembly comprises: An elastic telescopic member is arranged in the lubricating hole and can abut against the hole wall of the lubricating hole. An abutting assembly is connected with the end of the elastic telescopic member at one end and abuts against the inclined surface at the other end.

[0007] Optionally, in the side gap adjustable end face pair number spiral movable tooth transmission device, the abutting assembly comprises: An abutting part is in surface contact with the inclined surface. A connecting part is hingedly connected with the abutting part at one end and fixedly connected with the elastic telescopic member at the other end.

[0008] Optionally, in the side gap adjustable end face pair number spiral movable tooth transmission device, the transmission assembly further comprises a groove cam, and the outer peripheral wall of the groove cam is provided with a groove. When the movable tooth rotates in a first direction, the first side wall of the groove pushes the movable tooth; when the movable tooth rotates in a second direction, the second side wall of the groove pulls the movable tooth, the first direction is opposite to the second direction, and the first side wall and the second side wall are oppositely arranged.

[0009] Optionally, in the side gap adjustable end face pair number spiral movable tooth transmission device, the movable tooth comprises a first end engaged with the inner gear ring for transmission and a second end arranged away from the first end, and a roller bearing is connected with the movable tooth close to the second end, and the roller bearing is rollably accommodated in the groove.

[0010] Optionally, in the side gap adjustable end face pair logarithmic spiral movable tooth transmission device, a gap adjusting assembly is further arranged for adjusting the gap between the inner gear ring and the movable tooth.

[0011] Optionally, in the side gap adjustable end face pair logarithmic spiral movable tooth transmission device, an outer peripheral wall of the inner gear ring is provided with a first external thread. The gap adjusting assembly comprises: a mounting frame for fixing the inner gear ring in the circumferential direction, and an outer peripheral wall of the mounting frame is provided with a second external thread; a screwing member comprising a first part screwing with the inner gear ring and a second part screwing with the mounting frame, and the first part and the second part are connected; wherein the first external thread and the second external thread have different pitches.

[0012] Optionally, in the side gap adjustable end face pair logarithmic spiral movable tooth transmission device, the pitch of the first external thread is 1.45 mm, and the pitch of the second external thread is 1.5 mm.

[0013] Optionally, in the side gap adjustable end face pair logarithmic spiral movable tooth transmission device, the inner gear ring and the mounting frame are connected by spline.

[0014] Optionally, in the side gap adjustable end face pair logarithmic spiral movable tooth transmission device, a line in the groove and equidistant from the first side wall and the second side wall is a theoretical profile line, the theoretical profile line is a logarithmic spiral line, the groove is formed by axially sweeping the theoretical profile line, the first end face of the movable tooth and the second end face of the inner gear ring are both meshing surfaces based on the logarithmic spiral line, and the first end face and the second end face are in meshing transmission.

[0015] The application provides a side gap adjustable end face pair logarithmic spiral movable tooth transmission device. The holder is provided with a fixing hole allowing the movable tooth to pass through and a lubricating hole for the lubricating assembly to extend and retract. A slope is arranged on the housing, i.e., a surface for abutting against the lubricating assembly is a slope. When the movable tooth passes through the fixing hole and drives the lubricating assembly to rotate in the bottom area, the lubricating assembly restores the deformation and extends to push the abutting assembly to move close to the slope, thereby releasing space for the lubricating oil to enter the lubricating hole. When the movable tooth drives the lubricating assembly to rotate in the top area, the lubricating assembly is compressed by the slope, so that the elastic extension member is shortened, and the abutting assembly moves into the lubricating hole to extrude the lubricating oil in the lubricating hole and make it discharge to the meshing tooth surface of the inner gear ring. The movable tooth drives the lubricating assembly to move circularly between the top area and the bottom area. In this way, the problem that the movable tooth and the inner gear ring lack effective oil film protection in the top meshing area is overcome, the transmission precision is improved, and the service life of the device is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on the provided drawings without creative labor.

[0017] Figure 1 The schematic diagram of the partial section of the device provided by the present application is shown in the figure. Figure 2 The structural schematic diagram of the transmission assembly provided by the present application is shown in the figure. Figure 3 The structural schematic diagram of the gap adjusting assembly provided by the present application is shown in the figure. Figure 4 The schematic diagram of the groove cam provided by the present application is shown in the figure. Figure 5 The schematic diagram of the inner gear ring provided by the present application is shown in the figure. Figure 6 The structural schematic diagram of the roller bearing and movable tooth provided by the present application is shown in the figure. Figure 7 The schematic diagram of the retainer provided by the present application is shown in the figure. Figure 8 The schematic diagram of the section of the retainer provided by the present application is shown in the figure. Figure 7 The schematic diagram of the section of the retainer provided by the present application is shown in the figure. Figure 9 The structural schematic diagram of the retainer provided by the present application is shown in the figure.

[0018] In the Figures 1-9 , the following is shown in the figure: 1, movable tooth; 2, retainer; 3, inner gear ring; 4, lubricating hole; 5, fixing hole; 6, lubricating assembly; 7, shell; 8, groove cam; 9, groove; 10, roller bearing; 11, mounting frame; 12, screwing part; 13, locking nut; 14, first outer shell; 15, second outer shell; 16, first angular contact bearing; 17, second angular contact bearing; 18, cross roller bearing; 19, end cover. DETAILED DESCRIPTION

[0019] The present application provides a side gap adjustable end face logarithmic spiral movable tooth transmission device, which overcomes the problem of lack of effective oil film protection of the movable tooth and the inner gear ring in the top meshing area, improves the transmission precision, and prolongs the service life of the device.

[0020] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0021] As shown in Figures 1-9 The present application provides a side gap adjustable end face logarithmic spiral movable tooth transmission device, which comprises: a transmission assembly, including a movable tooth 1, a retainer 2 rotating synchronously with the movable tooth 1, and an inner gear ring 3 meshing and transmitting with the movable tooth 1, the retainer 2 is provided with a lubricating hole 4 and a fixed hole 5 allowing the movable tooth 1 to pass through, the lubricating hole 4 is located at the outer periphery of the fixed hole 5; a shell 7 allowing the movable tooth 1 to pass through; a lubricating assembly 6, including an elastic expansion piece and an abutting assembly, the elastic expansion piece is arranged in the lubricating hole 4 and can abut with the hole wall of the lubricating hole 4, the abutting assembly is connected with one end of the elastic expansion piece and abuts with the shell 7 at the other end, and the surface of the shell 7 abutting with the other end is an inclined surface; wherein the area where the movable tooth 1 rotates in the circumferential direction includes a top area and a bottom area, when the movable tooth 1 drives the lubricating assembly 6 to rotate in the bottom area, the lubricating assembly 6 restores the deformation and elongates to push the abutting assembly to approach the inclined surface, so that the length of the abutting assembly in the lubricating hole 4 is reduced to release space for the lubricating oil to enter the lubricating hole 4; when the movable tooth 1 drives the lubricating assembly 6 to rotate in the top area, the lubricating assembly 6 is compressed by the inclined surface, so that the elastic expansion piece is shortened and the abutting assembly moves towards the lubricating hole 4, so that the length of the abutting assembly in the lubricating hole 4 is increased to extrude the lubricating oil in the lubricating hole 4 and make it discharge to the meshing tooth surface of the inner gear ring 3.

[0022] It should be noted that there is lubricating oil in the side gap adjustable end face logarithmic spiral movable tooth transmission device, in the vertical direction, the bottom area refers to the area where the inner gear ring 3 is in contact with the lubricating oil, and the top area refers to the area where the inner gear ring 3 is not in contact with the lubricating oil. It can also be understood that, under the premise that the transmission device is not provided with the lubricating assembly 6, when the transmission device is transmitting, the area where the movable tooth 1 and the inner gear ring 3 mesh has lubricating oil is the bottom area, and the area where the movable tooth 1 and the inner gear ring 3 mesh has no lubricating oil is the top area.

[0023] As shown in Figure 1As shown, the holder 2 is an approximately symmetrical part as a whole, both sides of the holder 2 are machined with shaft shoulders to cooperate with the angular contact bearings (the first angular contact bearing 16 and the second angular contact bearing 17) in the normal direction, a threaded hole is opened on the right side of the holder 2 to be bolted with the external output end, that is, the holder 2 transmits the output torque as the output end, a fixed hole 5 cooperating with the movable tooth 1 is opened in the middle of the holder 2 to realize the radial fixation of the movable tooth 1. A lubricating hole 4 is arranged on the outer periphery of the fixed hole 5, and a lubricating assembly 6 is arranged in the lubricating hole 4, which can be an elastic bag type lubricating assembly 6 or a composite structure composed of capillary porous material and elastomer. Specifically, when the lubricating assembly 6 is an elastic bag type lubricating assembly, the elastic bag type lubricating assembly includes a flexible elastic bag body arranged in the lubricating hole 4, a one-way oil inlet valve (only inlet but no outlet) arranged at the first end of the flexible elastic bag body, and a compression assembly arranged at the second end of the flexible elastic bag body, the compression assembly includes a spring and an end face fixedly connected with the spring, the end face is used to abut against the inclined surface, the flexible elastic bag body is connected with the one-way oil inlet valve and allows the lubricating oil to flow into the flexible elastic bag body from the one-way oil inlet valve.

[0024] Due to the rotation of the movable tooth 1 and the certain weight of the lubricating assembly 6, the lubricating assembly 6 generates a centrifugal force in the rotating process, the direction of the centrifugal force is radially outward, at the same time, the end of the lubricating assembly 6 is in contact with the inclined surface of the shell 7, the lubricating assembly 6 is subjected to the centrifugal force in the radial outward direction, which can be decomposed into two forces. The first component force: presses the lubricating assembly 6 towards the inclined surface, the second component force: the force in the direction of abutting against the inclined surface, the second component force is offset by the restraining action of the lubricating hole 4 on the lubricating assembly 6. In this way, the end of the lubricating assembly 6 can always abut against the inclined surface and move without leaving the inclined surface.

[0025] More specifically, as shown in Figure 2 , Figure 8 and Figure 9 , the holder 2 is provided with the fixed hole 5 allowing the movable tooth 1 to pass through and the lubricating hole 4 for the extension and retraction of the lubricating assembly 6, by arranging the inclined surface on the shell 7 and the inclined direction of the inclined surface can be understood as the inclined surface formed by counterclockwise rotation of the vertical plane, and the counterclockwise rotation angle is less than 90° (herein the rotation angle is not specifically limited, only for helping to understand the inclined direction of the inclined surface), so that when the movable tooth 1 rotates to the bottom region, the lubricating assembly 6 abuts against the inclined surface of the shell 7 located in the bottom region, and at this time the distance between the inclined surface and the wall of the holder 2 provided with the lubricating hole 4 and facing the inclined surface is a first distance, the lubricating assembly 6 in the lubricating hole 4 is subjected to the first component force, and due to the existence of the inclined surface, the whole lubricating assembly 6 moves relative to the lubricating hole 4, as shown in Figure 1As shown, moving to the left, the lubrication assembly 6 releases the lubricating oil into the lubrication hole 4. The lubricating oil enters the lubrication hole 4, and as the movable tooth 1 rotates to the top region, the distance between the inclined plane and the wall of the retainer 2 with the lubrication hole 4 facing the inclined plane is the second distance. This second distance is less than the first distance. Under the pressure of the inclined plane, the local length of the lubrication assembly 6 within the lubrication hole 4 increases; that is, the lubrication assembly 6 moves relative to the lubrication hole 4. Figure 1 As shown, moving to the right causes the lubrication component 6 to squeeze the lubricating oil, allowing the previously introduced lubricating oil to be discharged to the meshing tooth surface of the movable tooth 1 and the internal gear ring 3. This overcomes the problem of insufficient oil film protection in the upper meshing area between the movable tooth 1 and the internal gear ring 3, improving transmission accuracy and extending the service life of the device.

[0026] It should be noted that when stationary, one end of the lubrication component 6 abuts against the lubrication hole 4, and the other end abuts against the inclined surface; the lubrication component 6 retainer 2 has multiple circumferentially arranged components.

[0027] The first outer shell 14, the housing 7, and the second outer shell 15 are fixed together by bolts. The crossed roller bearing 18 is fixed by the first outer shell 14, the housing 7, the end cap 19, and the grooved cam 8.

[0028] Among them, such as Figure 1 As shown, the lubrication assembly 6 includes: an elastic telescopic member disposed within the lubrication hole 4 and capable of abutting against the wall of the lubrication hole 4; and an abutting assembly, one end of which is connected to the end of the elastic telescopic member, and the other end of which abuts against the inclined surface. The elastic telescopic member is a spring. Firstly, the elastic telescopic member buffers the abutment between the lubrication assembly 6 and the lubrication hole 4, extending the service life of the device; secondly, the elastic telescopic member has a certain volume, and it can expand and contract under centrifugal force, contributing to the entry and exit of lubricating oil. The end of the abutting assembly that abuts against the inclined surface can be an inclined surface or a circular protrusion.

[0029] The above structure is simple in composition, and the principle of extension and retraction when it rotates with the movable tooth 1 is also relatively simple and reliable.

[0030] More specifically, the abutting component includes: an abutting part that makes surface contact with the inclined surface; and a connecting part that is hinged at one end to the abutting part and fixedly connected at the other end to the elastic telescopic member.

[0031] This can be understood as the abutting part being an inclined end face. Specifically, the abutting part includes an end face and two parallel vertical walls provided on the protruding end face. A first hole is opened on each of the two vertical walls. The shape of the end face can be circular, square, or irregular, etc. By having the inclined surface contact the abutting part, the contact area with the inclined surface of the housing 7 is increased, thereby increasing the reliability of the lubrication component 6.

[0032] like Figure 9As shown, the connecting part is a protruding part provided with a columnar part and a protruding columnar part, the protruding part is provided protruding along the length direction of the columnar part, and the second hole is provided in the protruding part. The first hole and the second hole are penetrated by a penetrating member such as a bolt or a screw, and are connected with the penetrating member by a fastener such as a nut (in order to ensure the hinge connection between the connecting part and the abutting part, the threaded area of the bolt or the screw is limited), or in order to improve the reliability of the lubricating assembly 6, a pin shaft can be used to penetrate the first hole and the second hole, and then the fastener is welded on the pin shaft, so that the abutting part and the connecting part are hinged, thereby increasing the flexibility of the lubricating assembly 6 and reducing wear.

[0033] The other end of the connecting part is fixedly connected with the elastic expansion member, thereby increasing the firmness of the lubricating assembly 6.

[0034] In optional embodiments, as shown in Figure 2 and Figure 4 As shown, the transmission assembly further comprises a groove cam 8, and the outer peripheral wall of the groove cam 8 is provided with a groove 9; wherein when the movable tooth 1 rotates in a first direction, a first side wall of the groove 9 pushes the movable tooth 1; when the movable tooth 1 rotates in a second direction, a second side wall of the groove 9 pulls the movable tooth 1, the first direction is opposite to the second direction, and the first side wall and the second side wall are oppositely arranged. It should be noted that the first direction is one of the clockwise direction and the counterclockwise direction, the second direction is the other of the clockwise direction and the counterclockwise direction, the first side wall (as a driving surface) refers to the wall surface away from the meshing end of the movable tooth 1, and the second side wall (as a return surface) refers to the wall surface closer to the meshing end of the movable tooth 1 than the first side wall.

[0035] In the prior art, the movable tooth 1 may be stuck in the return phase of engaging with the inner tooth ring 3, which is due to the fact that the movable tooth 1 is subjected to a pushing force in the pushing phase due to the groove cam 8, and the meshing-in phase of the movable tooth 1 is strictly implemented according to the design scheme, but the movable tooth 1 is not subjected to a special force in the return phase, so that the movable tooth 1 may be stuck. Therefore, the groove 9 structure is provided, so that the movable tooth 1 is subjected to a pushing force not only in the pushing phase but also in the return phase, thereby avoiding the sticking problem in the original design return phase and improving the accuracy of transmission.

[0036] Wherein, the movable tooth 1 comprises a first end engaged with the inner tooth ring 3 for transmission, and a second end away from the first end, and the movable tooth 1 is connected with the roller bearing 10 close to the second end, and the roller bearing 10 is rollably accommodated in the groove 9. The roller bearing 10 is sleeved and connected with a rod-shaped fixing member at the same time, and the fixing member is fixedly connected with the inner wall of the roller bearing 10. In this way, the flexibility of the device is improved, and the friction is reduced.

[0037] As shown in Figure 2As shown, here the meshing section of the movable tooth 1 and the inner tooth ring 3 is described in detail, the roller bearing 10 connected with the movable tooth 1 is in the leftmost position, i.e. the trough position, in the groove 9, with the rotation of the groove cam 8, the logarithmic spiral groove 9 (to be referred to later) in the groove cam 8 moves from the trough position to the peak position at the contact position with the roller bearing 10, the roller on the roller bearing 10 is subjected to a thrust force of the left side raceway and has a tendency to move in the right side axial direction, but since the tooth surface of the movable tooth 1 is engaged with the tooth surface of the inner tooth ring 3, the movable tooth 1 can only move along the tooth surface direction of the inner tooth ring 3, the movement has a circumferential direction component and the direction is opposite to that of the groove cam 8, since the tooth side of the movable tooth 1 is in the hole of the retainer 2, the circumferential direction movement of the movable tooth 1 drives the retainer 2 to move, thereby achieving deceleration.

[0038] In addition, the side gap adjustable end face logarithmic spiral movable tooth transmission device further comprises a gap adjusting assembly for adjusting the gap between the inner tooth ring 3 and the movable tooth 1. The machining error, assembly error and wear problem after long time running of the parts such as the movable tooth 1 and the inner tooth ring 3 in the production process will affect the theoretical zero side gap transmission and produce meshing tooth impact vibration, which affects the transmission accuracy. The setting of the gap adjusting assembly can avoid the above problems.

[0039] Wherein, the outer peripheral wall of the inner tooth ring 3 is provided with a first external thread; the gap adjusting assembly comprises: a mounting bracket 11 for fixing the inner tooth ring 3 in the circumferential direction, and a second external thread is arranged on the outer peripheral wall of the mounting bracket 11; a screw member 12 comprising a first part screwed with the inner tooth ring 3 and a second part screwed with the mounting bracket 11, the first part and the second part are connected; wherein the pitches of the first external thread and the second external thread are different. Figure 3 As shown, the first part is located at the left side of the second part, and in the initial state, the internal thread of the first part is engaged with the leftmost side of the first external thread of the inner tooth ring 3, and the internal thread of the second part is engaged with the leftmost side of the second external thread of the mounting bracket 11, when the screw member 12 is rotated to move to the right side, i.e. to move to the right relative to the inner tooth ring 3 and the mounting bracket 11, since the pitches of the first external thread and the second external thread are different, the inner tooth ring 3 moves to the left relative to the mounting bracket 11 to compensate for the tooth side gap caused by wear or machining, thereby improving the accuracy of transmission.

[0040] It should be noted that the specific pitches of the first external thread and the second external thread are set according to requirements.

[0041] In one example, the first external thread has a pitch of 1.45 mm, and the second external thread has a pitch of 1.5 mm. Since there is a pitch difference between the first part of the screw 12 with an internal thread pitch of 1.45 mm and the second part with an internal thread pitch of 1.5 mm, when the screw 12 is rotated to move it to the right, i.e., to move it to the right relative to the inner ring 3 and the mounting frame 11, the inner ring 3 moves to the left relative to the mounting frame 11 by 0.05 mm due to the different pitches of the first external thread and the second external thread. When the end face counter helical gear transmission device has a tooth side gap between the movable tooth 1 and the inner ring 3 due to machining, installation or wear, the tooth side gap can be reduced by rotating the screw 12, and after adjustment, the locking nut 13 arranged on the right side of the screw 12 can be used for locking. The second housing 15 is designed in a detachable form to facilitate the adjustment of the gap.

[0042] More specifically, the inner ring 3 and the mounting frame 11 are connected by spline connection. This connection mode limits the rotation of the inner ring 3 in the circumferential direction of the mounting frame 11, but allows the movement of the inner ring 3 in the axial direction.

[0043] This connection mode is simple and reliable.

[0044] In an alternative embodiment, the line located in the groove 9 and equidistant from the first side wall and the second side wall is a theoretical profile line, the theoretical profile line is a logarithmic spiral line, and the groove 9 is formed by sweeping the theoretical profile line in the axial direction. The first end face of the movable tooth 1 and the second end face of the inner ring 3 are both meshing surfaces formed based on a logarithmic spiral line, and the first end face and the second end face are in meshing transmission. It should be noted that the parameters of the logarithmic spiral line forming the groove 9 are matched with the parameters of the logarithmic spiral line forming the first end face and the second end face. The specific parameters include the wave number of the groove cam 8, the number of teeth of the inner ring 3, the spiral angle of the logarithmic spiral line, the base circle radius, and the reference radius. Preferably, the high-order polynomial modification method can be used to make the curves at the peaks and valleys of the profile line of the groove 9 continuously smooth, and the speed and acceleration do not change suddenly.

[0045] The basic principles of the present application are described above in conjunction with specific embodiments, but it should be noted that the advantages, advantages, effects and the like mentioned in the present application are only examples and not limitations, and these advantages, advantages, effects and the like cannot be considered as the must-have of each embodiment of the present application. In addition, the above specific details are only for the purpose of example and for the purpose of understanding, and are not limited to the present application, and the above specific details do not limit the present application to the above specific details.

[0046] The block diagrams of the devices, apparatuses, equipment, systems referred to in the present application are only illustrative examples and are not intended to require or imply that the connection, arrangement, configuration must be as shown in the block diagrams. These devices, apparatuses, equipment, systems can be connected, arranged, configured in any manner as will be appreciated by those skilled in the art. Words such as "include", "contain", "have", and the like are open-ended words, mean "including but not limited to", and can be used interchangeably with each other. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably with each other, unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably with each other.

[0047] It should also be noted that in the devices, apparatuses and boxes of the present application, each component or each step can be disassembled and / or reassembled. These disassembly and / or reassembly should be considered as equivalent solutions of the present application.

[0048] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other aspects without departing from the scope of the present application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0049] It should be understood that the adjectives "first", "second", "third", "fourth", "fifth" and "sixth" used in the embodiments of the present application are only used for more clearly describing the technical solutions and cannot be used to limit the protection scope of the present application.

[0050] The above description has been given for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A helical gear transmission device with adjustable backlash and a number of end faces, characterized in that, include: The transmission assembly includes a movable tooth, a cage that rotates synchronously with the movable tooth, and an internal gear ring that meshes with the movable tooth. The cage has a lubrication hole and a fixing hole that allows the movable tooth to pass through. The lubrication hole is located on the outer periphery of the fixing hole. The housing allows the movable teeth to pass through; The lubrication assembly includes an elastic telescopic member and an abutment assembly. The elastic telescopic member is disposed in the lubrication hole and can abut against the wall of the lubrication hole. One end of the abutment assembly is connected to the end of the elastic telescopic member, and the other end abuts against the housing. The surface of the housing that abuts against the other end is an inclined surface. The area where the movable tooth rotates circumferentially includes a top area and a bottom area. When the movable tooth drives the lubrication component to rotate in the bottom area, the lubrication component recovers its deformation and elongates to push the abutting component closer to the inclined surface, thereby reducing the length of the abutting component in the lubrication hole and providing space for lubricating oil to enter the lubrication hole. When the movable tooth drives the lubrication component to rotate in the top area, the lubrication component is compressed by the inclined surface, causing the elastic telescopic member to shorten and the abutting component to move into the lubrication hole, thereby increasing the length of the abutting component in the lubrication hole to squeeze the lubricating oil in the lubrication hole and discharge it to the meshing tooth surface of the internal gear ring.

2. The adjustable backlash, end-face-number helical gear transmission device according to claim 1, characterized in that, The abutment component includes: The abutting part is in surface contact with the inclined surface; The connecting part is hinged at one end to the abutting part and fixedly connected at the other end to the elastic telescopic member.

3. The adjustable backlash, end-face-number helical gear transmission device according to claim 1, characterized in that, The transmission assembly also includes a grooved cam, the outer peripheral wall of which is provided with a groove; When the movable tooth rotates along the first direction, the first sidewall of the groove pushes the movable tooth; when the movable tooth rotates along the second direction, the second sidewall of the groove pulls the movable tooth. The first direction is opposite to the second direction, and the first sidewall and the second sidewall are arranged opposite to each other.

4. The adjustable backlash, end-face-number helical gear transmission device according to claim 3, characterized in that, The movable tooth includes a first end that meshes with the internal gear ring and a second end located away from the first end. Near the second end, the movable tooth is connected to a roller bearing, which is rotatably accommodated in the groove.

5. The adjustable backlash, end-face-number helical gear transmission device according to claim 1, characterized in that, It also includes a clearance adjustment assembly for adjusting the clearance between the internal gear ring and the movable tooth.

6. The adjustable backlash, end-face-number helical gear transmission device according to claim 5, characterized in that, The outer peripheral wall of the internal gear ring is provided with a first external thread; The gap adjustment component includes: Mounting bracket for fixing the internal gear ring in the circumferential direction, and a second external thread is provided on the outer peripheral wall of the mounting bracket; The screwed connector includes a first portion screwed to the internal gear ring and a second portion screwed to the mounting bracket, the first portion and the second portion being connected; The pitches of the first external thread and the second external thread are different.

7. The adjustable backlash, end-face-number helical gear transmission device according to claim 6, characterized in that, The pitch of the first external thread is 1.45 mm, and the pitch of the second external thread is 1.5 mm.

8. The adjustable backlash, end-face-number helical gear transmission device according to claim 6, characterized in that, The internal gear ring and the mounting bracket are connected by a spline.

9. The adjustable backlash, end-face-number helical gear transmission device according to claim 4, characterized in that, The line located within the groove and equidistant from the first sidewall and the second sidewall is the theoretical profile. The theoretical profile is a logarithmic spiral, and the groove is formed by sweeping the theoretical profile axially. The first end face of the movable tooth and the second end face of the internal gear ring are both meshing surfaces based on logarithmic spirals, and the first end face and the second end face engage in meshing transmission.

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