Skid gear assembly

Abstract

The utility model relates to a slipping gear assembly which comprises a first gear, a second gear and an elastic sliding block set. The first gear and the second gear are coaxially connected, and the elastic sliding block set is arranged between the first gear and the second gear. The elastic sliding block set comprises at least one pair of sliding blocks suitable for moving in the radial direction of the first gear and the second gear, and a pair of elastic pieces matched with the pair of sliding blocks in a one-to-one mode. When the first gear and the second gear are kept in the same motion state to transmit torque, the sliding block is still relative to the first gear and the second gear. When the first gear and the second gear slide relatively, the sliding block slides back and forth in the radial direction of the first gear and the second gear.

Description

TECHNICAL FIELD

[0001] The utility model relates to transmission gear technical field especially, it relates to a skid gear assembly. BACKGROUND

[0002] Skid gear assembly is generally applied in transmission mechanism, for example, the gear transmission system connected with the output shaft of motor. Specifically speaking, the main shaft output torque of motor and gear transmission system strength can realize reasonable matching under general circumstances, can satisfy the use requirement under normal load, but the situation of damaging motor inevitably will be encountered when motor is overloaded, especially in the field of application of micro motor, the artificial external force often causes the situation that the load of micro motor exceeds the rated load, and the gear is easy to break.

[0003] For this, for example, the announcement number CN214371241U discloses a skid mechanism, it includes the driving gear and driven gear of cooperation, two are connected through the driving assembly, specifically it adopts the driving assembly including elastic piece and runner, and the elastic piece includes elastic sheet, and the skid of two is realized by the concave-convex fit structure formed between the elastic sheet and runner. Herein for the realization of skid mainly relies on the deformability of elastic sheet, since elastic sheet belongs to thin product, it can reduce the elastic performance because of long-term use and use fatigue, thereby can cause the problem of cooperation failure between elastic sheet and runner and shorten the service life of overall skid mechanism.

[0004] Further, for example, the announcement number CN217002786U discloses a skid transmission gear assembly, it includes the first gear and second gear of cooperation and transmission gear, wherein the inner side wall of the bushing of second gear is provided with a plurality of elastic skid pieces. Skid piece also includes elastic arm, and one end of elastic arm is fixed on the side wall of the connecting seat, and the other end extends along the circumference of transmission gear. For the skid gear assembly of this structure, it can cause the problem of cooperation failure between transmission gear and elastic arm due to the abrasion and deformation of elastic arm after skidding several times.

[0005] Summarizing, in view of the stability of long-term use of the skid gear assembly applied in the gear transmission system in the prior art, its structure needs to be further optimized. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a skid gear assembly to solve the technical problem of improving the stability of long-term use.

[0007] The utility model discloses a skid gear assembly is realized as follows:

[0008] A slipping gear assembly comprises a first gear and a second gear coaxially connected, and a resilient slider set arranged between the first gear and the second gear;

[0009] The resilient slider set comprises at least one pair of sliders adapted to move along the radial direction of the first gear and the second gear, and a pair of elastic members matched with the pair of sliders one-to-one;

[0010] When the first gear and the second gear keep the same motion state to transmit torque, the sliders are static relative to the first gear and the second gear;

[0011] When the first gear and the second gear relatively slip, the sliders slide back and forth along the radial direction of the first gear and the second gear.

[0012] In the optional implementation of the utility model, the first gear is a large gear, the second gear is a small gear, and the resilient slider set is arranged in the large gear;

[0013] The small gear at least comprises a slipping tooth part arranged in the large gear for matching the resilient slider set; a slipping structure is formed between the outer circumferential surface of the slipping tooth part and the sliders in conformance.

[0014] In the optional implementation of the utility model, the slipping structure is a plurality of grooves distributed in the circumferential direction on the outer circumferential surface of the slipping tooth part, a ridge shaped between every two adjacent grooves, and a protruding part arranged on each slider adapted to be embedded into any groove.

[0015] In the optional implementation of the utility model, the outer end surface of each ridge away from the axis of the slipping tooth part is a circular arc surface; and

[0016] The outer end surfaces of the plurality of ridges away from the axis of the slipping tooth part form a same circumferential surface.

[0017] In the optional implementation of the utility model, the wall surface of the protruding part in contact with the groove is a circular arc surface.

[0018] In the optional implementation of the utility model, the large gear comprises a gear disc, and a mounting hole for assembling the slipping tooth part and at least one pair of movable slots for one-to-one accommodating the sliders arranged in the gear disc and distributed concentrically with the gear disc; and

[0019] Each movable slot is located at the circumferential side of the mounting hole and communicates with the mounting hole;

[0020] The outer end surfaces of the plurality of ridges away from the axis of the slipping tooth part are in contact with the inner wall of the mounting hole.

[0021] In optional implementation of the utility model, at least one guide rail matched with the sliding block is arranged in each movable groove.

[0022] In optional implementation of the utility model, the pinion further comprises a transmission gear part coaxially connected with the slipping gear part.

[0023] In optional implementation of the utility model, the end face of the slipping gear part away from the transmission gear part is detachably connected with a limiting plate suitable for limiting one axial end of the gear wheel.

[0024] In optional implementation of the utility model, the outer diameter of the transmission gear part is larger than that of the slipping gear part, and the end face of the transmission gear part towards the slipping gear part is suitable for limiting the other axial end of the gear wheel.

[0025] In optional implementation of the utility model, a partition plate suitable for limiting the other axial end of the gear wheel is further arranged between the transmission gear part and the slipping gear part.

[0026] By adopting the above technical scheme, the utility model has the following beneficial effects: the slipping gear assembly of the utility model realizes the relative slipping between the first gear and the second gear through the back-and-forth movement of the sliding block along the radial direction of the first gear and the second gear, and the process of the slipping friction between the sliding block and the first gear or the second gear is not easy to cause the deformation and wear of the sliding block, so that the probability of affecting the service life due to the damage of the sliding block can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is the structure schematic view of the slipping gear assembly of the utility model in the non-slip state;

[0028] Figure 2 is the sectional structure schematic view of the slipping gear assembly of the utility model;

[0029] Figure 3 is the structure schematic view of the first view angle and the second view angle of the gear wheel of the slipping gear assembly of the utility model;

[0030] Figure 4 is the structure schematic view of the slipping gear assembly of the utility model in the slipping state;

[0031] Figure 5 is the first view angle structure schematic view of the pinion of the slipping gear assembly of the utility model;

[0032] Figure 6 is the second view angle structure schematic view of the pinion of the slipping gear assembly of the utility model;

[0033] Figure 7 is a first view and a second view of the sliding block of the slipping gear assembly. DETAILED DESCRIPTION

[0034] In order to make the content of the utility model more easily and clearly understood, the utility model is further described in detail below according to specific embodiments and in conjunction with the drawings.

[0035] Please refer to Figures 1 to 7 The embodiment provides a slipping gear assembly, which comprises coaxially connected first and second gears and an elastic sliding block set arranged between the first and second gears, wherein the elastic sliding block set comprises at least one pair of sliding blocks 45 adapted to move along the radial direction of the first and second gears, and a pair of elastic members used in cooperation with the pair of sliding blocks 45, wherein the elastic members can be selected from, but are not limited to, springs 44. Based on the structure, when the first and second gears keep the same movement state to transmit torque, the sliding blocks 45 are stationary relative to the first and second gears; when the first and second gears slip relative to each other, the sliding blocks 45 slide back and forth along the radial direction of the first and second gears.

[0036] Specifically, when the first and second gears slip relative to each other, the first gear can be stationary and the second gear rotates, and at this time, the sliding blocks 45 of the elastic sliding block set slip and rub against the second gear; or the second gear can be stationary and the first gear rotates, and at this time, the sliding blocks 45 of the elastic sliding block set slip and rub against the first gear.

[0037] Based on the above structure, the embodiment in detail in conjunction with the drawings in a specific optional implementation case:

[0038] The first gear is a large gear 41, the second gear is a small gear 42, and the elastic sliding block set is arranged in the large gear 41. The outer diameter of the large gear 41 is greater than the outer diameter of the small gear 42, so that the small gear 42 can be at least partially assembled into the large gear 41.

[0039] More specifically, first, the large gear 41 comprises a gear disc 411, mounting holes 412 arranged in the gear disc 411 and concentrically distributed with the gear disc 411 for assembling the small gear 42, and at least one pair of movable grooves 416 for one-to-one accommodating the sliding blocks 45. Each movable groove 416 is located on the circumferential side of the mounting hole 412 and communicates with the mounting hole 412. The mounting hole 412 adopts a circular through hole to meet the use requirement of assembling the small gear 42.

[0040] On the basis of the above structure, a receiving hole 453 suitable for the partial insertion of the spring 44 is arranged inside the sliding block 45, and the end of the spring 44 outside the receiving hole 453 is in abutting engagement with the wall of the active slot 416 away from the slipping tooth portion 4022 of the pinion 42. Thus, when the sliding block 45 moves away from the slipping tooth portion 4022 of the pinion 42, the spring 44 is compressed and deformed, and under the restoring force of the spring 44, the sliding block 45 can move to the side of the slipping tooth portion 4022 of the pinion 42. In addition, optionally, the sliding block 45 is in engagement with the guide rail 414 in the active slot 416 through the guide slot 452 arranged thereon, thereby improving the accuracy of the linear motion trajectory of the sliding block 45.

[0041] Next, the pinion 42 will be described. The pinion 42 at least comprises a slipping tooth portion 4022 for engaging the elastic sliding block set. The outer circumferential surface of the slipping tooth portion 4022 and the sliding block 45 form a conforming slipping structure. Based on this structure, when the sliding block 45 engages the slipping tooth portion 4022, the pinion 42 and the gear wheel 41 maintain the same motion state (in this embodiment, the same motion state can be that both remain stationary or that both rotate synchronously); and when the pinion 42 rotates relative to the gear wheel 41, the sliding block 45 is adapted to slide back and forth along the radial direction of the gear wheel 41 to slip with the slipping tooth portion 4022.

[0042] In this embodiment, two pairs of sliding blocks 45 are arranged as an example in combination with the drawings, and at this time, the corresponding active slots 416 are also two pairs, i.e., four active slots 416 correspond to four sliding blocks 45. In this regard, preferably, the two pairs of sliding blocks 45 are orthogonally distributed, so that the sliding blocks 45 in the four active slots 416 and the slipping tooth portion 4022 in the mounting hole 412 form a relatively balanced engagement relationship.

[0043] Based on this, it should be noted that the outer circumferential surface of the slipping tooth portion 4022 and the sliding block 45 form a conforming slipping structure. In this regard, as an example of a specific optional implementation, the slipping structure is a plurality of grooves 423 distributed in the circumferential direction on the outer circumferential surface of the slipping tooth portion 4022, a ridge 424 formed between each adjacent two grooves 423, and a protrusion 451 arranged on each sliding block 45 and adapted to be embedded in any one groove 423.

[0044] It should be noted that in this embodiment, the outer end surface of each ridge 424 away from the axis of the slipping tooth portion 4022 is a circular arc surface; and the outer end surfaces of the plurality of ridges 424 away from the axis of the slipping tooth portion 4022 form a same circumferential surface. Under this structure, the outer end surfaces of the plurality of ridges 424 away from the axis of the slipping tooth portion 4022 are in contact with the inner wall of the mounting hole 412, thereby ensuring the reliability and stability of the rotation process of the pinion 42 relative to the gear wheel 41.

[0045] Furthermore, the wall surface of the optional protrusion 451 of the present embodiment in contact with the groove 423 is a circular arc surface, that is, a circular arc surface is formed on the groove 423 and the protrusion 451 respectively. The radius of each groove 423 is greater than the radius of any one ridge 424. Under this structure, when the pinion 42 rotates relative to the gear wheel 41, friction will be formed between the ridge 424 and the protrusion 452, and the matching mode of the circular arc surface can reduce the friction.

[0046] On the basis of the above structure, in order to better realize the transmission function of the pinion 42, in combination with the drawings, an optional case is exemplified, the pinion 42 of the present embodiment further comprises a transmission tooth part 4021 coaxially connected with the slip tooth part 4022. Only the slip tooth part 4022 is installed into the mounting hole 412, and the transmission tooth part 4021 will not enter the mounting hole 412. The transmission tooth part 4021 can be understood as a gear structure with teeth. Since it does not need to be assembled into the mounting hole 412, in theory, the outer diameter of the transmission tooth part 4021 can be greater than that of the slip tooth part 4022. At this time, the transmission tooth part 4021 can be greater than the gear wheel 41 in principle, of course, the outer diameter of the transmission tooth part 4021 here can be the same as that of the slip gear part 422, or the outer diameter of the transmission tooth part 4021 is smaller than that of the slip gear part 422. The present embodiment does not make absolute limitation.

[0047] Regarding the cooperation of the pinion 42 and the gear wheel 41 of the present embodiment, since the pinion 42 needs to rotate in a slip manner relative to the gear wheel 41, the cooperation mode between the pinion 42 and the gear wheel 41 needs to meet the above requirement. In combination with the drawings, an optional case is exemplified as follows:

[0048] Generally, the transmission tooth part 4021 is adapted to be limited to one axial end of the gear disc 411 towards the end surface between the slip tooth part 4022; and the end surface of the slip tooth part 4022 away from the transmission tooth part 4021 is detachably connected with a limiting plate 43 adapted to be limited to the other axial end of the gear disc 411.

[0049] More specifically, the limiting plate 43 can be circular or other shapes, the embodiment with a circular limiting plate 43 as an example, the outer diameter of the limiting plate 43 is greater than the outer diameter of the mounting hole 412, the limiting plate 43 and the slip tooth portion 4022 can be, for example, but not limited to, a screw 46 fastening cooperation, when the limiting plate 43 and the slip tooth portion 4022 are assembled in place, the end surface of the limiting plate 43 towards the slip tooth portion 4022 is in contact with one axial end of the gear wheel 41. As for the other axial end of the gear wheel 41, at this time when the outer diameter of the transmission tooth portion 4021 is greater than the slip tooth portion 4022, the contact between the end surface of the transmission tooth portion 4021 towards the slip tooth portion 4022 and the gear wheel 41 can be used to form a reliable cooperation between the pinion 42 and the gear wheel 41, of course, there can also be a circular partition plate 422 between the slip tooth portion 4022 and the transmission tooth portion 4021, at this time the outer diameter of the transmission tooth portion 4021 and the slip tooth portion 4022 can be designed according to actual needs, here is not limited, as long as the outer diameter of the partition plate 422 can be greater than the outer diameter of the mounting hole 412, the partition plate 422 and the axial end of the gear wheel 41 can be used to form the reliability of the pinion 42 and the gear wheel 41 in the cooperation state.

[0050] Based on the above structure, for the overall assembly process of the pinion 42 and the gear wheel 41, the slip tooth portion 4022 of the pinion 42 is assembled into the mounting hole 412 of the gear wheel 41, and then the limiting plate 43 and the slip tooth portion 4022 are fastened and cooperated by, for example, the screw 46. When the pinion 42 and the gear wheel 41 need to be disassembled, only the limiting plate 43 and the slip tooth portion 4022 need to be disassembled. Therefore, the overall assembly and disassembly process is extremely convenient.

[0051] In summary, the specific implementation principle of the slip gear assembly used in the embodiment is as follows:

[0052] Figure 1 And Figure 2 The figure shows the slip gear assembly in the normal (not slip) state:

[0053] ①As Figure 1 And Figure 2 The assembly relationship, the partition plate 422 of the pinion 42 is in contact with the lower end surface 415 of the gear wheel 41, and the limiting plate 43 and the slip tooth portion 425 of the pinion 42 form a cooperation and are fastened by the connecting screw 46, the upper end is limited by the cooperation between the limiting plate 43 and the upper end surface 413 of the gear wheel 41, and the lower end is limited by the cooperation between the partition plate 422 of the pinion 42 and the lower end surface 415, so that the gear wheel 41 and the pinion 42 are connected and cooperated in the axial direction.

[0054] The convex ridge 424 of the small gear 42 is in contact with the mounting hole 412 of the large gear 41, so that the small gear 42 can rotate relative to the large gear 41.

[0055] The convex part 451 of the sliding block 45 is in contact with the recess 423 of the slip tooth part 4022 of the small gear 42 under the elastic force of the spring 44, so that the rotation of the small gear 42 is blocked, and the large gear 41 and the small gear 42 form a relatively static combination state; the equal distribution of the parts ensures the balance of force.

[0056] Figure 4 The slip gear assembly in the working (slip) state is shown in the figure:

[0057] When a larger external force is applied, the small gear 42 rotates relative to the large gear 41 under the force, and in the rotating process, the convex part 451 of the sliding block 45 is gradually separated from the recess 423 of the small gear 42, and at the same time, the spring 44 is continuously compressed, until the convex part 451 is in contact with the convex ridge 424, and then the convex ridge 424 passes the convex part 451, so that the convex part 451 cooperates with the next recess 423, and if the external force is continuously applied, the large gear 41 and the small gear 42 will continuously slip.

[0058] In summary, for the slip gear assembly of the embodiment, the slip of the small gear 42 relative to the large gear 41 is realized by the cooperation of the elastic sliding block group and the small gear, and the back and forth movement of the sliding block 45 along the radial direction of the large gear 41, and the process of the sliding block 45 and the small gear 42 forming slip friction does not easily cause deformation and wear of the sliding block 45, so that the probability of affecting the service life due to damage of the sliding block 45 can be reduced.

[0059] The above specific embodiments further illustrate the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above is only a specific embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

[0060] In the description of the utility model, it should be understood that the terms indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0061] In the utility model, unless another definite provision and limitation, the term " install " " link " " connect " " fixed " and so on term should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection;Can be directly connected, also can pass through intermediate medium indirectly connect, can be two element inside's intercommunication or two element's mutual action relation. For ordinary skilled person in the art, can understand the specific meaning of above -mentioned term in the utility model according to specific situation.

Claims

1. A sliding gear assembly, characterized by The application relates to a gear transmission device. The application comprises: a first gear and a second gear coaxially connected, and an elastic slider group arranged between the first gear and the second gear; the elastic slider group comprises at least a pair of sliders adapted to move along the radial direction of the first gear and the second gear, and a pair of elastic members matched with the pair of sliders; when the first gear and the second gear keep the same motion state to transmit torque, the sliders are static relative to the first gear and the second gear; 2. The skiving gear assembly of claim 1, wherein, when the first gear and the second gear are relatively slipped, the sliders slide back and forth along the radial direction of the first gear and the second gear. The first gear is a large gear, the second gear is a small gear, and the elastic slider group is arranged in the large gear; 3. The skiving gear assembly of claim 2, wherein, the small gear at least comprises a slip tooth part arranged in the large gear for matching the elastic slider group; a slip structure is formed between the outer surface of the slip tooth part and the sliders.

4. The skiving gear assembly of claim 3, wherein, The slip structure is a plurality of grooves distributed along the circumferential direction on the outer surface of the slip tooth part, a ridge shaped between every two adjacent grooves, and a protruding part arranged on each slider adapted to be embedded into any groove. The outer end surface of each ridge away from the axis of the slip tooth part is a circular arc surface; and 5. The skiving gear assembly of claim 4, wherein, the outer end surfaces of the plurality of ridges away from the axis of the slip tooth part form a same circumferential surface.

6. A sliding gear assembly according to claim 4 or 5, wherein, The wall surface of the protruding part in contact with the groove is a circular arc surface. The large gear comprises a gear disc, and a mounting hole for assembling the slip tooth part and at least a pair of movable slots for one-to-one accommodating the sliders arranged in the gear disc and coaxially distributed with the gear disc; and each movable slot is located on the circumferential side of the mounting hole and communicates with the mounting hole; 7. The skiving gear assembly of claim 6, wherein, the outer end surfaces of the plurality of ridges away from the axis of the slip tooth part are in contact with the inner wall of the mounting hole.

8. The sliding gear assembly of claim 2 or 3, wherein, At least one guide rail in sliding cooperation with the slider is arranged in each movable slot.

9. The skiving gear assembly of claim 8, wherein, The small gear further comprises a transmission tooth part coaxially connected with the slip tooth part.

10. The skiving gear assembly of claim 9, wherein, The end surface of the slip tooth part away from the transmission tooth part is detachably connected with a limiting plate adapted to be limited at one axial end of the large gear.

11. The skiving gear assembly of claim 9, wherein, The outer diameter of the transmission tooth part is larger than that of the slip tooth part, and the end surface of the transmission tooth part towards the slip tooth part is adapted to be limited at the other axial end of the large gear. A partition plate adapted to be limited at the other axial end of the large gear is further arranged between the transmission tooth part and the slip tooth part.

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