Separated duplicate gear and hollow speed reduction transmission device

Abstract

The embodiment provides a separated duplicate gear and a hollow speed reduction transmission device, and relates to the field of gear boxes, and the separated duplicate gear comprises a first gear, a second gear and an anti-rotation piece. A plurality of first tooth bodies are arranged on the peripheral surface of the first gear, a first positioning part is arranged on the first gear, and the first positioning part is located in a tooth groove formed by the adjacent first tooth bodies in the first tooth bodies; the second gear is provided with an assembly hole and a second positioning part; the second gear is sleeved outside the first gear and is in interference fit with the plurality of first tooth bodies; the anti-rotation piece is inserted into the first positioning part and the second positioning part at the same time and used for limiting relative rotation of the first gear and the second gear. By adjusting the position of the first positioning part, damage to the tooth body can be reduced, the structural strength of the tooth body is improved, and the service life of the tooth body is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of gear boxes, in particular to a split double gear and hollow reduction transmission device. Background Art

[0002] Traditional hollow precision reduction gears, due to the presence of a central duplex gear, suffer from structural limitations, resulting in low gear machining accuracy and the generation of significant noise during transmission. To improve the machining accuracy and service life of the duplex gears, some existing technologies employ a split-type duplex gear structure, machining the pinion and gear independently. The gear is then sleeved over the pinion, utilizing an interference fit to prevent rotation between the two.

[0003] The inventors discovered during their research that the existing duplex gears have at least the following disadvantages:

[0004] In order to limit the relative rotation of the large gear and the small gear, an anti-rotation pin is used to engage with both of them at the same time. When the anti-rotation pin penetrates the small gear, it will damage the teeth on the small gear, affecting the strength of the teeth and shortening the service life of the duplex gear. Utility Model Content

[0005] The objectives of the present invention include, for example, providing a split double gear and hollow reduction transmission device, which can reduce damage to the tooth body, improve the structural strength of the tooth body, and extend the service life of the tooth body.

[0006] The embodiment of the present utility model can be implemented as follows:

[0007] In a first aspect, the present invention provides a split double gear, comprising:

[0008] A first gear, a second gear and an anti-rotation member, wherein a plurality of first teeth are provided on the outer peripheral surface of the first gear, a first positioning portion is provided on the first gear, and the first positioning portion is located in a tooth groove formed by adjacent first teeth among the plurality of first teeth; the second gear is provided with an assembly hole and a second positioning portion, the second gear is sleeved on the outside of the first gear and has an interference fit with the plurality of first teeth; the anti-rotation member is simultaneously inserted into the first positioning portion and the second positioning portion, for limiting the relative rotation of the first gear and the second gear.

[0009] In an optional embodiment, the first positioning portion is configured as a first positioning groove, and a length of the first positioning groove extends in the axial direction of the first gear.

[0010] Based on the above solution, the structure of the first positioning portion is simple, the anti-rotation component can be assembled from the axial direction, and the assembly is simple and reliable.

[0011] In an optional embodiment, the first positioning portion is configured as a first positioning hole, and an axis of the first positioning hole and an axis of the first gear form an included angle.

[0012] Based on the above solution, the anti-rotation member is inserted into the first positioning hole, the contact area between the anti-rotation member and the first positioning hole is large, the connection is firm, and the anti-rotation effect is good.

[0013] In an optional embodiment, the axis of the first positioning hole extends in a radial direction of the first gear.

[0014] Based on the above solution, the first positioning hole is accurately positioned and short in length, which can reduce the length of the anti-rotation component, save materials, and reduce costs.

[0015] In an optional embodiment, the second positioning portion is configured as a second positioning groove, the second positioning groove is provided on the hole wall of the assembly hole, and the length of the second positioning groove extends on the axis of the second gear.

[0016] Based on the above solution, the first positioning groove and the second positioning groove cooperate to position the anti-rotation component, and the installation operation of the anti-rotation component is convenient and reliable.

[0017] In an optional embodiment, the second positioning portion is configured as a second positioning hole, and an axis of the second positioning hole and an axis of the second gear form an included angle.

[0018] Based on the above solution, the anti-rotation member is inserted into the first positioning hole and the second positioning hole at the same time. The anti-rotation member has a firm structure, a stable position and a good anti-rotation effect.

[0019] In an optional embodiment, a groove is provided on the outer surface of the anti-rotation component, and the groove is used to be filled with glue for bonding with the first gear and the second gear.

[0020] Based on the above scheme, a certain amount of glue is stored in the groove, and the anti-rotation part is inserted into the first positioning part and the second positioning part. The glue is bonded to the first gear and the second gear, thereby improving the firmness of the combination of the anti-rotation part and the first gear and the second gear. The position of the anti-rotation part is stable and reliable, not easy to loosen, and the anti-rotation effect is good.

[0021] In an optional embodiment, the second gear is provided with a thickened portion, the assembly hole passes through the thickened portion, and the thickened portion is sleeved on the outside of the first gear and has an interference fit with the first gear.

[0022] Based on the above solution, the thickened portion is sleeved on the outside of the first gear, the contact area of ​​the thickened portion with the first gear in the axial direction of the first gear is increased, and the combination of the thickened portion and the first gear is more firm and reliable.

[0023] In an optional embodiment, an annular protrusion is provided on the outer circumference of the first gear, and the annular protrusion is located between the two ends of the first gear. A plurality of second teeth are provided on the outer circumference of the annular protrusion.

[0024] Based on the above scheme, by setting an annular protrusion, step surfaces are formed on both sides of the annular protrusion. First, the axial position of the second gear sleeved on the first gear can be positioned, and second, the axial position of the bearing installed on the first gear can be positioned, which facilitates assembly.

[0025] In a second aspect, the present invention provides a hollow reduction transmission device, the hollow reduction transmission device comprising:

[0026] A planetary gear, a transmission assembly, a planetary carrier assembly, a pinion housing and a separate double gear as described in any one of the aforementioned embodiments, wherein the planetary gear and the planetary carrier assembly are rotatably matched, and the planetary carrier assembly and the pinion housing are connected through the transmission assembly; the first gear of the separate double gear is engaged with the planetary gear.

[0027] The beneficial effects of the embodiments of the present invention include, for example:

[0028] In summary, the present embodiment provides a split double gear, in which the first gear and the second gear are interference fit, and the first gear and the second gear are reinforced by an anti-rotation member, so that the first gear and the second gear are not easy to rotate relative to each other, the combination is firm and reliable, and the torque transmission is stable and reliable. At the same time, the first positioning portion is provided between the tooth grooves formed by adjacent first tooth bodies. The design of the first positioning portion does not damage the first tooth body and will not affect the structural strength of the first tooth body. The first tooth body is not easily damaged and has a long service life. At the same time, the first tooth body and the assembly hole are interference fit. Since the first tooth body is not damaged, the contact area between the first tooth body and the hole wall of the assembly hole is large, and the two fit more tightly, making it safe and reliable to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic diagram of a split double gear according to an embodiment of the present application;

[0031] Figure 2 for Figure 1 A local enlarged schematic diagram in FIG.

[0032] Figure 3A schematic diagram of a first gear according to an embodiment of the present application;

[0033] Figure 4 A partial schematic diagram of the first gear of an embodiment of the present application;

[0034] Figure 5 is a schematic diagram of the second gear of an embodiment of the present application;

[0035] Figure 6 Schematic diagram of a modified example of the split double gear according to the embodiment of the present application;

[0036] Figure 7 A schematic diagram of a hollow reduction transmission device according to an embodiment of the present application;

[0037] Figure 8 This is a schematic diagram of a modified example of the hollow reduction transmission device of the embodiment of the present application.

[0038] icon:

[0039] 100-first gear; 110-main body; 111-first end; 112-second end; 120-annular protrusion; 130-first positioning portion; 140-first tooth body; 150-second tooth body; 200-second gear; 210-thickened portion; 211-assembly hole; 220-transmission portion; 230-second positioning portion; 300-anti-rotation part; 310-groove. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0043] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the invented product is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0044] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0045] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention can be combined with each other.

[0046] In the prior art, the large and small gears of a split duplex gear system have an interference fit, and are further reinforced by a pin to enhance anti-rotation. To install the pin, a locating hole is provided on the small gear. However, machining the locating hole damages the teeth on the small gear, weakening the structural strength of the teeth and shortening the service life of the duplex gear.

[0047] In view of this, the designer provides a split double gear, which can ensure the integrity of the tooth body, thereby maintaining a high structural strength of the tooth body, extending the service life, reducing the failure rate and reducing operating costs.

[0048] Please refer to Figures 1-6 This embodiment provides a split double gear, which includes a first gear 100, a second gear 200, and an anti-rotation member 300. A plurality of first teeth 140 are provided on the outer peripheral surface of the first gear 100. A first positioning portion 130 is provided on the first gear 100. The first positioning portion 130 is located in a tooth groove formed by adjacent first teeth 140 among the plurality of first teeth 140; the second gear 200 is provided with an assembly hole 211 and a second positioning portion 230. The second gear 200 is sleeved on the outside of the first gear 100 and has an interference fit with the plurality of first teeth; the anti-rotation member 300 is inserted into both the first positioning portion 130 and the second positioning portion 230 to limit the relative rotation of the first gear 100 and the second gear 200.

[0049] As described above, the working principle of the split double gear provided in this embodiment is as follows:

[0050] Torque can be input into the second gear 200, which drives the first gear 100 to rotate, and the first gear 100 can output torque. During the torque transmission process, since the first gear 100 and the second gear 200 are interference fit, and the first gear 100 and the second gear 200 are reinforced by the anti-rotation member 300, the first gear 100 and the second gear 200 are not easy to rotate relative to each other, and the torque transmission efficiency is high. At the same time, the anti-rotation member 300 is fixed by the first positioning portion 130 and the second positioning portion 230, and the first positioning portion 130 is located between the tooth grooves formed by the adjacent first tooth bodies 140 of the first gear 100. The position design of the first positioning portion 130 does not damage the first tooth body 140 and does not affect the structural strength of the first tooth body 140. The first tooth body 140 is not easily damaged and has a long service life. At the same time, the first tooth body 140 and the assembly hole 211 have an interference fit. Since the first tooth body 140 is not damaged, the contact area between the first tooth body 140 and the hole wall of the assembly hole 211 is large, the two fit more tightly, and it is safe and reliable to use.

[0051] It should be understood that when processing and manufacturing the separate double gears, the first tooth body 140 on the first gear 100 can be processed first, and the second gear 200 can be sleeved on the outside of the first tooth body 140 and the two can be interference fit. Then, the first positioning part 130 can be processed on the first gear 100, and the second positioning part 230 can be processed on the second gear 200. In this way, the first positioning part 130 and the second positioning part 230 are not easily misaligned, and the alignment effect of the two is good, which makes it easy to insert the anti-rotation part 300 into the first positioning part 130 and the second positioning part 230, and the assembly efficiency and assembly quality are high.

[0052] The following embodiments illustrate the details of the split duplex gear of the present application by way of examples.

[0053] Please refer to Figure 1-Figure 2 In this embodiment, the optional separable double gear includes a first gear 100, a second gear 200 and an anti-rotation member 300. The second gear 200 is sleeved on the outside of the first gear 100, and the two are interference fit. The anti-rotation member 300 is installed with the first gear 100 and the second gear 200 at the same time. The anti-rotation member 300 is used to limit the relative rotation of the first gear 100 and the second gear 200, thereby improving the torque transmission efficiency.

[0054] Please combine Figure 3 and Figure 4Optionally, the first gear 100 includes an integral body 110 and an annular protrusion 120. The body 110 may be a cylinder having a first end 111 and a second end 112 in its axial direction. A through hole is provided in the middle of the body 110. The through hole is a circular hole and is coaxially arranged with the body 110. The annular protrusion 120 is located on the outer circumferential surface of the body 110. The annular protrusion 120 is a circular ring structure and is coaxially arranged with the body 110. The annular protrusion 120 is located between the first end 111 and the second end 112, that is, the annular protrusion 120 is spaced apart from the first end 111 and the second end 112. A plurality of first teeth 140 are provided on the outer circumferential surface between the first end 111 of the body 110 and the annular protrusion 120. The plurality of first teeth 140 are evenly spaced and arranged in the circumferential direction of the body 110. One end of the first tooth 140 is spaced apart from the first end 111, and the other end extends to the annular surface corresponding to the annular protrusion 120. The area between the second end 112 of the body 110 and the annular protrusion 120 can be used to mount the inner ring of the bearing, which abuts against the annular protrusion 120 to achieve position control. Furthermore, the outer circumference of the annular protrusion 120 is provided with a plurality of second teeth 150, evenly spaced around the axis of the annular protrusion 120. The second teeth 150 can mesh with gears to achieve torque transmission.

[0055] Optionally, the body 110 is provided with a first positioning portion 130, and the number of the first positioning portions 130 can be multiple. For example, in this embodiment, the number of the first positioning portions 130 is four and they are evenly spaced around the circumference of the body 110. The structure of each first positioning portion 130 can be set to be the same.

[0056] Please combine Figure 1 and Figure 6 For example, in one embodiment, the first positioning portion 130 may be a first positioning groove, which may be a semicircular groove and may be set as a countersunk groove. The length of the first positioning groove extends in the axial direction of the body 110, and the first positioning groove is located on the outer peripheral surface of the body 110 and between adjacent first teeth 140, without damaging the first teeth 140. At the same time, one end of the first positioning groove extends to the end surface where the first end 111 is located. In addition, in other embodiments, the first positioning portion 130 may be set as a first positioning hole, which may be a cylindrical hole, and the axis of the first positioning hole has an angle with the axis of the body 110. For example, the axis of the first positioning hole is perpendicular to the axis of the body 110, that is, the axis of the first positioning hole extends along the radial direction of the cross section of the body 110. The first positioning hole passes through the body 110, and the first positioning hole is located between adjacent first teeth 140, without damaging the first teeth 140.

[0057] Please combine Figure 5Optionally, the second gear 200 includes an integrated thickened portion 210 and a transmission portion 220. The thickened portion 210 is a cylindrical structure, and the assembly hole 211 is a circular hole and is coaxially arranged with the thickened portion 210. The transmission portion 220 is located on the outer circumferential surface of the thickened portion 210, and the transmission portion 220 is coaxially arranged with the thickened portion 210. A second positioning portion 230 is provided on the thickened portion 210. The number of the second positioning portions 230 is equal to the number of the first positioning portions 130, and the multiple second positioning portions 230 are matched with the multiple first positioning portions 130 in a one-to-one manner. The matched first positioning portions 130 and the second positioning portions 230 can be plugged into an anti-rotation component 300. Furthermore, when the first positioning portion 130 is a first positioning groove, the second positioning portion 230 is a second positioning groove, the second positioning groove is a semicircular groove, the second positioning groove can be a countersunk groove, the second positioning groove is located on the hole wall of the assembly hole 211, and the length of the second positioning groove extends in the axial direction of the assembly hole 211; when the first positioning portion 130 is a first positioning hole, the second positioning portion 230 is a second positioning hole, the second positioning hole can be a cylindrical hole, the second positioning hole is provided on the thickened portion 210, and is set through the thickened portion 210. The second positioning hole can be set perpendicular to the axis of the assembly hole 211. Obviously, in other embodiments, the axis of the second positioning hole can be at an angle other than 90° to the axis of the thickened portion 210.

[0058] It should be understood that the thickness of the thickened portion 210 is greater than the thickness of the transmission portion 220, and the thickness direction of the thickened portion 210 or the transmission portion 220 is the axial direction of the thickened portion 210 or the transmission portion 220. The thickened portion 210 is sleeved onto the outside of the first gear 100, and the contact area between the thickened portion 210 and the first gear 100 in the axial direction of the first gear 100 is increased, making the connection between the thickened portion 210 and the first gear 100 more secure and reliable.

[0059] In addition, a tooth body may be provided on the outer peripheral surface of the transmission part 220 so as to mesh with the input gear and thus transmit torque.

[0060] It should be understood that, according to needs, the outer diameter of the first tooth body 140 can be adjusted, so that the first gear 100 can be adapted to the second gear 200 with assembly holes 211 of different diameters, and has a wide range of uses.

[0061] Alternatively, the anti-rotation member 300 can be configured as a cylindrical pin. The number of anti-rotation members 300 matches the number of the first positioning portions 130 or the second positioning portions 230. For example, in this embodiment, there are four anti-rotation members 300. When both the first positioning portion 130 and the second positioning portion 230 are positioning slots, they cooperate to form a hole, and the anti-rotation member 300 is inserted simultaneously into the first positioning portion 130 and the second positioning portion 230 from the first end 111. When both the first positioning portion 130 and the second positioning portion 230 are positioning holes, the anti-rotation member 300 is inserted through the second positioning portion 230 and then into the first positioning portion 130.

[0062] In addition, a groove 310 for storing glue can be provided on the outer surface of the anti-rotation part 300. The groove 310 can be an annular groove and is located on the outer peripheral surface of the anti-rotation part 300. The groove 310 is arranged around the axis of the anti-rotation part 300. The volume of the groove 310 is large and can store more glue. There is glue all around the anti-rotation part 300, and the bonding with the first gear 100 and the second gear 200 is firm and reliable, thereby improving the bonding strength of the anti-rotation part 300, the first gear 100 and the second gear 200.

[0063] In the split double gear provided in this embodiment, the first positioning portion 130 is positioned between the tooth grooves formed by adjacent first teeth 140. The design of the first positioning portion 130 does not damage the integrity of the first teeth 140, nor does it affect the structural strength of the first teeth 140. The first teeth 140 are not easily damaged and have a long service life. Furthermore, the first teeth 140 and the assembly holes 211 have an interference fit. Because the first teeth 140 are intact, the contact area between the first teeth 140 and the wall of the assembly holes 211 is large, resulting in a tighter fit and safe and reliable use.

[0064] Please combine Figure 7 and Figure 8 This embodiment also provides a hollow reduction transmission device, including planetary gears, a transmission assembly, a planetary carrier assembly, a pinion housing, and the split double gears of the above-mentioned embodiment. The planetary gears and the planetary carrier assembly are rotatably matched, and the planetary carrier assembly and the pinion housing are connected through the transmission assembly; the first gear of the split double gears meshes with the planetary gears. The number of planetary gears can be multiple, and the second tooth body 150 of the split double gears meshes with multiple planetary gears simultaneously to achieve torque transmission. It should be understood that the hollow reduction transmission device also includes other transmission parts 220 to achieve its basic functions. Please refer to the existing known structure. In order to avoid repetition and redundancy in this embodiment, detailed description is not provided.

[0065] The hollow reduction transmission device provided in this embodiment has at least the advantages of high structural strength, long service life, and low failure rate.

[0066] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A split double gear, characterized in that: include: A first gear (100), a second gear (200) and an anti-rotation component (300), wherein a plurality of first teeth (140) are provided on the outer peripheral surface of the first gear (100), a first positioning portion (130) is provided on the first gear (100), and the first positioning portion (130) is located in a tooth groove formed by adjacent first teeth (140) among the plurality of first teeth (140); the second gear (200) is provided with an assembly hole (211) and a second positioning portion (230), and the second gear (200) is sleeved on the outside of the first gear (100) and has an interference fit with the plurality of first teeth; the anti-rotation component (300) is simultaneously inserted into the first positioning portion (130) and the second positioning portion (230) to limit the relative rotation of the first gear (100) and the second gear (200).

2. The split double gear according to claim 1, characterized in that: The first positioning portion (130) is configured as a first positioning groove, and the length of the first positioning groove extends in the axial direction of the first gear (100).

3. The split double gear according to claim 1, characterized in that: The first positioning portion (130) is configured as a first positioning hole, and an axis of the first positioning hole and an axis of the first gear (100) form an included angle.

4. The split double gear according to claim 3, characterized in that: The axis of the first positioning hole extends in the radial direction of the first gear (100).

5. The split double gear according to claim 1, characterized in that: The second positioning portion (230) is configured as a second positioning groove, the second positioning groove is provided on the hole wall of the assembly hole (211), and the length of the second positioning groove extends on the axis of the second gear (200).

6. The split double gear according to claim 1, characterized in that: The second positioning portion (230) is configured as a second positioning hole, and an axis of the second positioning hole and an axis of the second gear (200) form an included angle.

7. The split double gear according to claim 1, characterized in that: The outer surface of the anti-rotation component (300) is provided with a groove (310), and the groove (310) is used to be filled with glue for bonding with the first gear (100) and the second gear (200).

8. The split double gear according to claim 1, characterized in that: The second gear (200) is provided with a thickened portion (210), the assembly hole (211) passes through the thickened portion (210), and the thickened portion (210) is sleeved on the outside of the first gear (100) and is interference-fitted with the first gear (100).

9. The split double gear according to claim 1, characterized in that: An annular protrusion (120) is provided on the outer circumference of the first gear (100), and the annular protrusion (120) is located between the two ends of the first gear (100). A plurality of second teeth (150) are provided on the outer circumference of the annular protrusion (120).

10. A hollow reduction transmission device, characterized in that: The hollow reduction transmission device comprises: A planetary wheel, a transmission assembly, a planetary carrier assembly, a pinion housing and a separate double gear according to any one of claims 1 to 9, wherein the planetary wheel and the planetary carrier assembly are rotatably matched, and the planetary carrier assembly and the pinion housing are connected through the transmission assembly; the first gear of the separate double gear is engaged with the planetary wheel.

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