Combined gear structure

Abstract

The utility model discloses a combined type gear structure which comprises a large gear and a small gear, and a large shaft hole penetrating in the axial direction is formed in the core portion of the large gear. The inner diameter value of the large shaft hole is larger than the gear outer diameter value of the small gear. The rear end face of the pinion is provided with a circular-ring-shaped annular base part, the edge of the outer end of the annular base part is provided with two elastic sleeving parts which are arranged oppositely in the radial direction, the radial section of each elastic sleeving part is in an arc shape, and the diameter value of the outer arc-shaped face of each elastic sleeving part is gradually increased from front to back. The elastic sleeving part, the annular base part and the pinion are of an integrated structure; the large gear is located on the peripheries of the two elastic sleeving parts, and the outer arc-shaped face of each elastic sleeving part is elastically connected with the inner wall of the large shaft hole of the large gear in an abutting mode. By means of the structural design, the sliding force adjusting device has the advantages of being novel in design, simple in structure and convenient to adjust sliding force.

Description

Technical Field

[0001] The utility model relates to the technical field of gear structures, and in particular designs a combined gear structure. Background Art

[0002] In the gearbox, in order to achieve overload protection, that is, to avoid damage to important gear structures or motors due to excessive reaction force of the load, a slipping structure design is often used in the gearbox.

[0003] The patent number is: ZL202321126750.4, and the patent name is: Chinese utility model patent for a slip mechanism and a gear box. In essence, it discloses a gear structure with a slip structure design; specifically, the slip mechanism comprises a lower gear, an upper gear, a slip assembly, a bare rod shaft, a spring and two retaining springs, and an annular groove is provided on one side of the lower gear; a connecting ring is convexly provided on one side of the upper gear, and the connecting ring is arranged in the annular groove, and the inner wall of the connecting ring abuts against the inner ring side groove wall of the annular groove; the slip assembly is arranged on the outer ring side groove wall of the annular groove and the outer ring side groove wall of the connecting ring The gears are connected by a plurality of springs, each of which is connected to a plurality of gears, and the plurality of springs are connected to each other with a plurality of springs, and the plurality of springs are connected to each other with a plurality of springs.

[0004] For the above-mentioned sliding mechanism, when working, the elastic force of the spring is transmitted to the first sliding plate through the upper gear, so that the first sliding plate is in pressure contact with the second sliding plate, thereby generating friction between the first sliding plate and the second sliding plate; the friction force is the slipping force between the upper gear and the lower gear. When the reaction force of the load is greater than the slipping force, the upper gear and the lower gear rotate relative to each other and slip, thereby achieving overload protection.

[0005] It should be pointed out that the above-mentioned sliding mechanism has the following defects, specifically:

[0006] Defect 1. The entire gear assembly with overload protection includes an upper gear, a lower gear, a first sliding plate, a second sliding plate, a spring and a retaining spring, and the overall structure is complex and the cost is high;

[0007] Defect 2: When the slipping force needs to be adjusted, it is necessary to change the material of the slipping sheet, the size of the spring's compression force, or the roughness of the slipping sheet's surface, etc., which makes it inconvenient to adjust the slipping force. Utility Model Content

[0008] The utility model aims to provide a combined gear structure to address the deficiencies of the prior art. The combined gear structure has a novel design, a simple structure and convenient adjustment of the slipping force.

[0009] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical solutions.

[0010] A combined gear structure includes a large gear and a small gear, wherein the core of the large gear is provided with a large shaft hole axially penetrating therethrough;

[0011] The inner diameter value of the large shaft hole is larger than the outer diameter value of the gear of the small gear;

[0012] The rear end face of the pinion gear is provided with an annular base in the shape of a circular ring, and the outer end edge of the annular base is provided with two elastic sleeve parts which are arranged radially opposite to each other and have radial cross sections in the shape of circular arcs, and the diameter value of the outer arc surface of each elastic sleeve part gradually increases from front to back, and the elastic sleeve part, the annular base and the pinion gear are an integrated structure;

[0013] The large gear is located at the peripheries of the two elastic sleeve parts, and the outer arc surface of each elastic sleeve part elastically abuts against the inner wall of the large shaft hole of the large gear.

[0014] Wherein, a metal ring in the shape of a circular ring is arranged between the two elastic sleeve parts, and the inner arc surface of each elastic sleeve part is in contact with the metal ring.

[0015] Wherein, the rear end edge portion of the outer arc-shaped surface of each elastic sleeve portion is respectively provided with a limit stop portion protruding radially outward, and the limit stop portion and the elastic sleeve portion are an integrated structure.

[0016] Wherein, a cylindrical portion in a cylindrical shape is arranged between the two elastic sleeve portions, and the cylindrical portion is coaxially arranged with the pinion gear;

[0017] The core of the pinion gear is provided with a small shaft hole which penetrates axially, and the rear end opening of the small shaft hole is located at the rear end surface of the cylindrical part.

[0018] Compared with the prior art, the present invention has the following beneficial effects, specifically:

[0019] 1. The slipping force between the large gear and the small gear of the utility model depends on the elastic force between the two elastic sleeve parts and the inner wall of the large shaft hole. The above elastic force can be adjusted by adjusting the axial distance between the large gear and the small gear. That is, the slipping force between the large gear and the small gear can be achieved by adjusting the axial distance between the large gear and the small gear, and the slipping force can be easily adjusted.

[0020] 2. The combined gear structure of the utility model does not need to use springs or sliding plate structures. Compared with the prior art, the combined gear structure of the utility model is simpler in structure;

[0021] 3. Therefore, the combined gear structure of the utility model has the advantages of novel design, simple structure and convenient adjustment of slipping force. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below with reference to the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0023] Figure 1 It is a structural schematic diagram of the utility model.

[0024] Figure 2 It is an exploded schematic diagram of the utility model.

[0025] Figure 3 It is a structural schematic diagram of the pinion of the utility model.

[0026] Figure 4 This is a schematic structural diagram of the pinion of the utility model from another perspective.

[0027] exist Figures 1 to 4 Included are:

[0028] 1-large gear; 11-large shaft hole; 2-small gear; 21-small shaft hole; 3-annular base; 4-elastic sleeve portion; 41-outer arc surface; 42-inner arc surface; 5-metal ferrule; 6-limit stop portion; 7-cylindrical portion. DETAILED DESCRIPTION

[0029] The present invention will be described below in conjunction with specific implementation methods.

[0030] Embodiment 1, as Figures 1 to 4 As shown, a combined gear structure includes a large gear 1 and a small gear 2. The core of the large gear 1 is provided with a large shaft hole 11 axially penetrating therethrough; wherein the inner diameter of the large shaft hole 11 is larger than the outer diameter of the small gear 2.

[0031] Further, such as Figures 2 to 4 As shown, the rear end face of the pinion 2 is provided with an annular base 3 in the shape of an annulus, and the outer edge of the annular base 3 is provided with two elastic sleeve parts 4 arranged radially opposite to each other and having radial cross-sections in the shape of arcs, and the diameter value of the outer arc surface 41 of each elastic sleeve part 4 gradually increases from front to back, and the elastic sleeve part 4, the annular base 3, and the pinion 2 are an integrated structure. It should be explained that the pinion 2 of the first embodiment is a plastic injection molded part, and the elastic sleeve part 4, the annular base 3, and the pinion 2 are processed into an integrated structure by plastic injection molding.

[0032] Furthermore, if Figure 1 and Figure 2As shown, the large gear 1 is located at the periphery of the two elastic sleeve parts 4, and the outer arc surface 41 of each elastic sleeve part 4 elastically abuts against the inner wall of the large shaft hole 11 of the large gear 1.

[0033] It should be pointed out that, in the process of fitting the large gear 1 to the periphery of the two elastic fitting parts 4, the small gear 2 is passed through the large shaft hole 11 of the large gear 1 and the large gear 1 is located at the periphery of the two elastic fitting parts 4. In this process, the inner wall of the large shaft hole 11 of the large gear 1 presses inward against the outer arc surfaces 41 of the two elastic fitting parts 4 and causes the two elastic fitting parts 4 to deflect inward respectively. At this time, the restoring elastic force of each elastic fitting part 4 reacts to the inner wall of the large shaft hole 11 respectively, thereby generating pressure between the inner wall of the large shaft hole 11 and the outer arc surfaces 41 of each elastic fitting part 4, and finally generating friction between the large gear 1 and the two elastic fitting parts 4.

[0034] During operation, the small gear 2 of the first embodiment of the present invention can be used as an input end gear, and the large gear 1 can be used as an output end gear; when the reaction force of the load on the large gear 1 is greater than the friction force between the large gear 1 and the two elastic sleeve parts 4, relative rotation and slippage will occur between the large gear 1 and the small gear 2, thereby realizing the function of slip protection.

[0035] It should be emphasized that the slipping force between the large gear 1 and the small gear 2 in the first embodiment of the present invention depends on the elastic force between the two elastic sleeve parts 4 and the inner wall of the large shaft hole 11. The above elastic force can be adjusted by adjusting the axial distance between the large gear 1 and the small gear 2. That is, the slipping force between the large gear 1 and the small gear 2 only needs to be achieved by adjusting the axial distance between the large gear 1 and the small gear 2, and the slipping force can be easily adjusted.

[0036] In addition, the combined gear structure of the first embodiment does not need to adopt a spring or a sliding plate structure. Compared with the prior art, the combined gear structure of the first embodiment is simpler in structure.

[0037] In summary, it can be seen that, through the above structural design, the combined gear structure of the first embodiment has the advantages of novel design, simple structure and convenient adjustment of slipping force.

[0038] Embodiment 2, as Figure 1 and Figure 2 As shown, the difference between the second embodiment and the first embodiment is that a metal ring 5 in the shape of a circular ring is installed between the two elastic sleeve parts 4, and the inner arc surface 42 of each elastic sleeve part 4 is in contact with the metal ring 5 respectively.

[0039] When the inner wall of the large gear 1 presses the two elastic sleeve parts 4 inward, the two elastic sleeve parts 4 that are deflected inward will press the metal ring 5. At this time, the metal ring 5 will produce elastic deformation. The elastically deformed metal ring 5 will react to the two elastic sleeve parts 4, thereby making the two elastic sleeve parts 4 in an inside-outside extrusion state. The reaction force of the elastically deformed metal ring 5 on the elastic sleeve part 4 will also increase the pressure between the large gear 1 and the elastic sleeve part 4.

[0040] Embodiment three, as Figures 1 to 4 As shown, the difference between the third embodiment and the first embodiment is that the rear end edge of the outer arc surface 41 of each elastic sleeve portion 4 is respectively provided with a radially outwardly protruding limit stop portion 6, and the limit stop portion 6 and the elastic sleeve portion 4 are an integral structure.

[0041] For the limit stopper 6 of the third embodiment, when the large gear 1 is fitted around the two elastic fitting parts 4, the limit stopper 6 can limit and block the end surface of the large gear 1 to avoid the problem of slipping when the large gear 1 is fitted.

[0042] Embodiment 4, as Figures 1 to 4 As shown, the difference between the fourth embodiment and the first embodiment is that a cylindrical portion 7 in a cylindrical shape is provided between the two elastic sleeve portions 4 , and the cylindrical portion 7 is coaxially arranged with the pinion 2 .

[0043] The core of the pinion gear 2 is provided with an axially penetrating small shaft hole 21 , and the rear end opening of the small shaft hole 21 is located at the rear end surface of the cylindrical portion 7 .

[0044] When the pinion 2 of the fourth embodiment is installed, a gear shaft is inserted into the pinion shaft hole 21 thereof. The cylindrical portion 7 can, on the one hand, increase the contact area between the gear shaft and the pinion 2 to improve the installation stability of the pinion 2; on the other hand, it can block and limit the two elastic sleeve portions 4 when they deflect inward to avoid excessive deformation and damage of the two elastic sleeve portions 4.

[0045] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A combined gear structure, comprising a large gear (1) and a small gear (2), wherein the core of the large gear (1) is provided with a large shaft hole (11) extending axially therethrough; Features: The inner diameter of the large shaft hole (11) is greater than the outer diameter of the small gear (2); The rear end surface of the pinion gear (2) is provided with an annular base portion (3) in the shape of an annulus, and the outer end edge portion of the annular base portion (3) is provided with two elastic sleeve portions (4) which are arranged radially opposite to each other and have radial cross-sections in the shape of circular arcs, the diameter value of the outer arc surface (41) of each elastic sleeve portion (4) gradually increases from front to back, and the elastic sleeve portion (4), the annular base portion (3) and the pinion gear (2) are an integrated structure; The large gear (1) is located at the peripheries of the two elastic sleeve parts (4), and the outer arcuate surfaces (41) of each elastic sleeve part (4) are elastically abutted against the inner wall of the large shaft hole (11) of the large gear (1).

2. A combined gear structure according to claim 1, characterized in that: A metal ring (5) in the shape of a circular ring is installed between the two elastic sleeve parts (4), and the inner arc surface (42) of each elastic sleeve part (4) is in contact with the metal ring (5).

3. A combined gear structure according to claim 1, characterized in that: The rear end edge of the outer arcuate surface (41) of each elastic sleeve portion (4) is respectively provided with a limit stop portion (6) protruding radially outwards, and the limit stop portion (6) and the elastic sleeve portion (4) are an integral structure.

4. A combined gear structure according to claim 1, characterized in that: A cylindrical portion (7) in a cylindrical shape is provided between the two elastic sleeve portions (4), and the cylindrical portion (7) is coaxially arranged with the pinion gear (2); The core of the pinion gear (2) is provided with a small shaft hole (21) which penetrates axially, and the rear end opening of the small shaft hole (21) is located at the rear end surface of the cylindrical portion (7).

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