Small RV speed reducer

Abstract

The utility model discloses a small-sized RV speed reducer, which relates to the technical field of speed reducers, and comprises an input shaft, a planetary gear assembly, a cycloid speed reduction assembly and an output assembly, the output end part of the input shaft is sleeved with a transmission sun gear, the input shaft and the transmission sun gear are arranged in a concentric circle, and the cycloid speed reduction assembly is fixedly connected with the output assembly. After the input shaft penetrates through the cycloid speed reduction assembly, the transmission sun gear is meshed with the crank planetary gear set to form transmission, so that the cycloid speed reduction assembly synchronously generates planetary rotation, and speed reduction output is conducted through the cycloid speed reduction assembly by means of the output assembly. Assembly parts are simple, the structural design is compact, a transmission structure formed by the cycloid gear in the swing ring is brought in a gear meshing mode, the transmission stability is improved, the axial length needed by a traditional cycloid gear is further reduced, the size is greatly reduced, the production efficiency can be greatly improved, the assembly difficulty is reduced, and the production cost is reduced. And the product practicability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of speed reduction equipment, and more specifically, to a small RV speed reducer. Background Art

[0002] The reducer is a common mechanical transmission device used to reduce the speed of the input shaft and increase the torque of the output shaft. Its main structure usually includes the input shaft (drive shaft), reducer housing, reducer internal gear set, output shaft (driven shaft), etc. It is an important component of the reduction gear set inside the reducer. However, the current RV reducer has become bloated and difficult to miniaturize because it uses a multi-stage gear reduction structure. At present, the RV reducer market with a diameter of less than 100mm is relatively blank. In addition, the cycloid gears of the currently slightly miniaturized reducers have a sharper profile and often have problems such as stress concentration. Although the problem is not prominent in larger structures, it is particularly obvious when used in RV small reduction after being reduced in size. There is no direct processing tool after the size is reduced, and it is difficult to perform turning and milling, broaching, gear shaping and grinding, etc. Expensive wire cutting, electric spark and other processing methods are required, which greatly increases the processing cost and greatly reduces the processing capacity.

[0003] Therefore, the present application develops a small RV reducer to solve the above problems. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a small RV reducer to solve one or more of the above-mentioned problems.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The present application provides a small RV reducer, which includes an input shaft, a cycloid reduction assembly and an output assembly. The output end of the input shaft is sleeved with a transmission sun gear, and the input shaft and the transmission sun gear are arranged as coaxial axes. The cycloid reduction assembly and the output assembly are fixedly connected. After the input shaft passes through the cycloid reduction assembly, the transmission sun gear meshes with the crank planetary gear set to form a transmission, so that the cycloid reduction assembly synchronously generates planetary rotation, so as to reduce the output by using the output assembly through the cycloid reduction assembly.

[0007] As a feasible preferred method, the cycloidal reduction assembly includes a cycloidal coil, an upper cycloidal gear and a lower cycloidal gear. An inner gear ring is arranged inside the cycloidal coil. The upper cycloidal gear and the lower cycloidal gear are mirror-arranged and rotate eccentrically. A cycloidal gear set is formed between the upper cycloidal gear, the lower cycloidal gear and the inner gear ring of the cycloidal coil, and planetary transmission is realized.

[0008] As a preferred embodiment that can be realized, the crank shaft includes a first connecting column and a second connecting column arranged on one side close to the lower epicycloid gear, the first connecting column and the second connecting column are eccentrically arranged, the diameter of the first connecting column is larger than the diameter of the second connecting column, the lower epicycloid gear rotates eccentrically around multiple first connecting columns, and the upper epicycloid gear rotates eccentrically around multiple second connecting columns.

[0009] As a feasible preferred method, the crank planetary gear set includes three planetary gears meshing with the transmission sun gear, each planetary gear is fixedly mounted with a corresponding crankshaft, the crankshaft is an eccentric shaft, and each planetary gear is connected to the lower cycloid gear and the upper cycloid gear in sequence through the corresponding eccentric shaft.

[0010] As a feasible preferred method, the cycloid reduction assembly also includes a gear end cover, a first hole is arranged at the center of the gear end cover, a center hole is arranged at the center of the lower cycloid gear, and the transmission sun gear is installed after the input shaft passes through the first hole and the center hole.

[0011] As a feasible preferred method, the upper cycloidal gear and the lower cycloidal gear are both symmetrically provided with multiple second holes with their centers as the centers, and the gear end cover is symmetrically provided with multiple third holes with its center as the center, and the crank shaft passes through the second hole and the third hole in sequence to realize the transmission connection with the upper cycloidal gear and the lower cycloidal gear.

[0012] As a feasible preferred manner, a matching second bearing is arranged in the second holes of the upper cycloid gear and the lower cycloid gear, and a matching third bearing is arranged in the third hole of the gear end cover.

[0013] As a feasible preferred method, the output component includes an output end cover, a plurality of connecting shafts are arranged on the output end cover, each connecting shaft is provided with a pin hole along its axial direction, a plurality of fourth holes are correspondingly arranged on the upper cycloid gear and the lower cycloid gear, a plurality of pins matching the pin holes are arranged on the gear end cover, and the connecting shaft passes through the fourth holes to realize the fixed connection between the gear end cover and the output end cover.

[0014] As a feasible preferred manner, a plurality of fifth holes are provided on a side of the output end cover close to the planetary gear, and one end of the crankshaft is placed in the fifth hole.

[0015] As a feasible preferred manner, the reducer further comprises an input housing and an output housing, and the input housing, the oscillating coil and the output housing are fixedly connected by bolts.

[0016] As a feasible preferred mode, the width A, length B, and thickness H of the RV reducer are 50mm≤A≤60mm, 50mm≤B≤60mm, and 20mm≤H≤30mm.

[0017] As a feasible preferred mode, the RV reducer is cylindrical, with a diameter D and a thickness H of 60mm≤D≤80mm, 20mm≤H≤40mm, and 20mm≤H≤30mm.

[0018] In summary, the utility model has the following beneficial effects:

[0019] First, the assembly parts of the present application are simple, the structural design is compact, and the size of the prepared RV reducer is greatly reduced;

[0020] Second, the input shaft is connected to the output shaft of the motor, and the rotation of the input shaft drives the transmission sun gear at one end of the input shaft to rotate, and the rotation of the transmission sun gear drives the three planetary gears meshing with it to rotate. Because the planetary gears are fixedly connected with the upper cycloid gear and the lower cycloid gear through the crankshaft, bearings and other components, the upper cycloid gear and the lower cycloid gear are driven to move relatively synchronously, so that the upper cycloid gear and the lower cycloid gear perform cycloid motion in the inner gear ring of the cycloid coil, that is, a planetary gear transmission is formed. In this application, the gear end cover, the upper cycloid coil, the lower cycloid coil and the output end cover are fixedly connected to achieve transmission deceleration. This structure uses the gear meshing form to bring the cycloid gear to the transmission structure formed in the cycloid coil, improves the transmission stability, further reduces the axial length required for the traditional cycloid gear, greatly reduces the size, can greatly improve production efficiency, reduce assembly difficulty, reduce production costs, and increase the practicality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the explosion structure of a small RV reducer provided by the utility model;

[0022] Figure 2 This is a schematic diagram of an exploded structure of a small RV reducer provided by the utility model from another perspective;

[0023] Figure 3 A simplified structural diagram of a small RV reducer provided by the utility model;

[0024] Figure 4 A schematic diagram of the cross-sectional structure of a small RV reducer provided by the utility model;

[0025] Figure 5 A schematic diagram of the overall structure of a small RV reducer provided by the utility model;

[0026] Figure 6 A schematic diagram of the internal three-dimensional structure of a small RV reducer provided by the utility model;

[0027] Figure 7 This is a schematic diagram of the structure of the planetary gear connection in a small RV reducer provided by the utility model;

[0028] Figure 8 A schematic diagram of a partial three-dimensional structure inside a small RV reducer provided by the utility model. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that all expressions using "first", "second", "third" and "fourth" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first", "second", "third" and "fourth" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0031] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0032] The following is combined with Figure 1-8 The utility model is described in further detail.

[0033] The present application provides a small RV reducer, which includes an input housing 11, an input shaft 1, a cycloid reduction assembly and an output assembly 2, and the output end of the input shaft is sleeved with a transmission sun gear 3. The input end of the input shaft is fixedly connected to the output end of the motor shaft for receiving the power output by the motor, the input shaft 1 and the transmission sun gear 3 are arranged concentrically, the cycloid reduction assembly and the output assembly 2 are fixedly connected, and the input shaft 1 passes through the cycloid reduction assembly, and then the transmission sun gear 3 is meshed with the crank planetary gear set to form a transmission, so that the cycloid reduction assembly synchronously generates planetary rotation, so as to reduce the output through the cycloid reduction assembly using the output assembly 2.

[0034] like Figure 1-2As shown, it should be explained that the cycloid reduction assembly in the present application includes a cycloid coil 4, an upper cycloid gear 5, a gear end cover 7 and a lower cycloid gear 6. An inner gear ring 41 is provided inside the cycloid coil 4. The cycloid coil 4, the input housing 11 and the output housing 12 are fixedly connected by bolts. The upper cycloid gear 5 and the lower cycloid gear 6 are mirror-imaged and rotate eccentrically. The upper and lower cycloid gears are respectively sleeved on the crankshaft of the crank planetary gear set. A cycloid gear set is formed between the upper cycloid gear 5, the lower cycloid gear 6 and the inner gear ring of the cycloid coil 4 to realize planetary transmission. The output housing is connected through the output end bearing and the output end cover.

[0035] like Figure 7 As shown, the crankshaft 9 includes a first connecting column 91 and a second connecting column 92 arranged on one side close to the lower cycloid gear 6. The first connecting column 91 and the second connecting column 92 are eccentrically arranged, and the diameter of the first connecting column 91 is larger than the diameter of the second connecting column 92. The lower cycloid gear 6 rotates eccentrically around a plurality of first connecting columns, and the upper cycloid gear 5 rotates eccentrically around a plurality of second connecting columns. Specifically, each tooth on the upper cycloid gear 5 and the lower cycloid gear 6 in the present application moves forward alternately on the inner gear ring. For example, the inner gear ring has 50 teeth. For each rotation of the crank planetary gear, the cycloid gear moves forward on the inner gear ring by an angle of one tooth, that is, 360 / 50=7.2 degrees.

[0036] The center of the gear end cover 7 in the present application is provided with a first hole 71, and the upper cycloid gear 5, the lower cycloid gear 6 and the gear end cover are provided with coaxial axes. After the input shaft 1 passes through the first hole 71, the transmission sun gear 3 is fixedly mounted on the output shaft. In combination with the above content, it should be noted that the width A, length B, and thickness H of the RV reducer in the present application are 50mm≤A≤60mm, 50mm≤B≤60mm, and 20mm≤H≤30mm. The RV reducer is cylindrical, with a diameter D and a thickness H of 60mm≤D≤80mm, 20mm≤H≤40mm, and 20mm≤H≤30mm.

[0037] Therefore, the structural design of the present application is compact and ingenious, and the power is output in sequence to the transmission sun gear 3, the crank planetary gear set, the lower cycloid gear 6, the upper cycloid gear 5, and the output assembly through the input shaft, thereby achieving reduced speed output.

[0038] It should be explained that the crank planetary gear set includes three planetary gears 8 meshing with the transmission sun gear 3, each planetary gear 8 is correspondingly fixedly mounted with a crankshaft 9, the upper cycloid gear 5 and the lower cycloid gear 6 are both provided with three second holes 52 symmetrically with the center of the circle, the gear end cover 7 is provided with three third holes 72 symmetrically with the center of the circle, the second holes 52 of the upper cycloid gear 5 and the lower cycloid gear 6 are provided with matching second bearings 53, and the third hole 72 of the gear end cover 7 is provided with matching third bearings 73, and the crankshaft 9 sequentially penetrates the second hole 52 and the third hole 72 to realize the transmission connection with the upper cycloid gear 5 and the lower cycloid gear 6. In addition, the gear end cover is also provided with a circumferential angle positioning hole, which is located at the edge of the gear end cover. During the processing, the processing accuracy and positioning accuracy are ensured by cooperating with other parts, thereby improving the accuracy and quality of the product.

[0039] In the present application, the output assembly 2 includes an output end cover, on which a plurality of connecting shafts 21 are arranged, each connecting shaft 21 is provided with a latch hole 22 along its axial direction, a plurality of fourth holes 54 are correspondingly arranged on the upper cycloid gear 5 and the lower cycloid gear 6, a plurality of latches 74 matching with the latch holes 22 are arranged on the gear end cover 7, and the connecting shaft 21 passes through the fourth hole to realize the fixed connection between the gear end cover 7 and the output end cover 2. A plurality of fifth holes are arranged on the side of the output end cover close to the planetary gear 8, and one end of the crankshaft 9 is placed in the fifth hole.

[0040] Working principle: The RV reducer used in this application is connected with the output shaft of the motor through the input shaft 1. The rotation of the input shaft drives the transmission sun gear at one end of the input shaft to rotate, and the rotation of the transmission sun gear drives the three planetary gears meshing with it to rotate. Because the planetary gears are fixedly connected with the upper cycloid gear and the lower cycloid gear through the crankshaft, bearings and other components, the upper cycloid gear and the lower cycloid gear are driven to move relatively synchronously, so that the upper cycloid gear and the lower cycloid gear perform cycloid motion in the inner gear ring of the cycloid coil, that is, a planetary gear transmission is formed. In this application, the gear end cover, the upper cycloid coil, the lower cycloid coil and the output end cover are fixedly connected to achieve transmission reduction. The assembly parts of this application are simple, the structural design is compact, and the size of the prepared RV reducer is greatly reduced, which meets the actual needs. At the same time, the gear meshing form is used to bring the transmission structure formed by the cycloid gear in the cycloid coil, which improves the transmission stability, further reduces the axial length required for the traditional cycloid gear, and greatly reduces the size, which can greatly improve the production efficiency, reduce the difficulty of assembly, reduce the production cost, and increase practicality.

[0041] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A small RV reducer, characterized in that: The reducer comprises an input shaft (1), a cycloid reduction assembly and an output assembly (2); the output end of the input shaft is sleeved with a transmission sun gear (3); the input shaft (1) and the transmission sun gear (3) are arranged concentrically; the cycloid reduction assembly and the output assembly (2) are fixedly connected; after the input shaft (1) passes through the cycloid reduction assembly, the transmission sun gear (3) meshes with a crank planetary gear set to form a transmission, so that the cycloid reduction assembly synchronously generates planetary rotation, so as to reduce the output through the cycloid reduction assembly using the output assembly (2).

2. A small RV reducer according to claim 1, characterized in that: The cycloid reduction assembly comprises a cycloid coil (4), an upper cycloid gear (5) and a lower cycloid gear (6); an inner gear ring (41) is arranged inside the cycloid coil (4); the upper cycloid gear (5) and the lower cycloid gear (6) are arranged in a mirror image and rotate eccentrically; a cycloid gear set is formed between the upper cycloid gear (5), the lower cycloid gear (6) and the inner gear ring of the cycloid coil (4), and planetary transmission is realized.

3. A small RV reducer according to claim 2, characterized in that: The crank planetary gear set comprises three planetary gears (8) meshing with the transmission sun gear (3), each of the planetary gears (8) is correspondingly fixedly mounted with a crankshaft (9), the crankshaft is an eccentric shaft, and each of the planetary gears (8) is sequentially connected to a lower cycloid gear (6) and an upper cycloid gear (5) via a corresponding eccentric shaft.

4. A small RV reducer according to claim 3, characterized in that: The crankshaft (9) includes a first connecting column (91) and a second connecting column (92) which are arranged on one side close to the lower epicycloid gear (6); the first connecting column (91) and the second connecting column (92) are eccentrically arranged; the diameter of the first connecting column (91) is greater than the diameter of the second connecting column (92); the lower epicycloid gear (6) rotates eccentrically around a plurality of the first connecting columns (91); and the upper epicycloid gear (5) rotates eccentrically around a plurality of the second connecting columns (92).

5. A small RV reducer according to claim 4, characterized in that: The cycloid reduction assembly further comprises a gear end cover (7), a first hole (71) is arranged at the center of the gear end cover (7), a center hole (51) is arranged at the center of the upper cycloid gear (5) and the lower cycloid gear (6), and the input shaft (1) passes through the first hole (71) and the center hole (51) before the transmission sun gear (3) is installed.

6. A small RV reducer according to claim 5, characterized in that: The upper cycloid gear (5) and the lower cycloid gear (6) are both symmetrically provided with a plurality of second holes (52) with their center as the center, and the gear end cover (7) is symmetrically provided with a plurality of third holes (72) with its center as the center, and the crankshaft (9) passes through the second hole (52) and the third hole (72) in sequence to achieve transmission connection with the upper cycloid gear (5) and the lower cycloid gear (6).

7. A small RV reducer according to claim 6, characterized in that: A matching second bearing (53) is arranged in the second holes (52) of the upper cycloid gear (5) and the lower cycloid gear (6), and a matching third bearing (73) is arranged in the third hole (72) of the gear end cover (7).

8. A small RV reducer according to claim 6, characterized in that: The output assembly (2) comprises an output end cover, a plurality of connecting shafts (21) are arranged on the output end cover, each of the connecting shafts (21) is provided with a latch hole (22) along its axial direction, a plurality of fourth holes (54) are correspondingly provided on the upper cycloid gear (5) and the lower cycloid gear (6), a plurality of latches (74) matching the latch holes (22) are provided on the gear end cover (7), and the connecting shaft (21) is passed through the fourth hole to achieve fixed connection between the gear end cover (7) and the output end cover.

9. A small RV reducer according to claim 1, characterized in that: The width A, length B, and thickness H of the RV reducer are 50mm≤A≤60mm, 50mm≤B≤60mm, and 20mm≤H≤30mm.

10. A small RV reducer according to claim 1, characterized in that: The RV reducer is cylindrical with a diameter D and a thickness H of 60mm≤D≤80mm, 20mm≤H≤40mm, and 20mm≤H≤30mm.

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