Modular crankshaft and RV speed reducer

Abstract

The utility model discloses a modularized crankshaft and an RV speed reducer, and belongs to the field of speed reducers. The shape memory alloy assembly is sleeved outside the central shaft; the first shaft sleeve assembly and the second shaft sleeve assembly are detachably connected outside the shape memory alloy assembly in a sleeving mode, and the first shaft sleeve assembly abuts against the second shaft sleeve assembly. The first shaft sleeve assembly and the second shaft sleeve assembly are the same in structure and each comprise a first shaft sleeve body detachably connected to the outside of the shape memory alloy assembly in a sleeving mode. And the second shaft sleeve body is sleeved outside the first shaft sleeve body. A first flat potential is arranged outside the first shaft sleeve body, a second flat potential is arranged in the second shaft sleeve body, and the first flat potential abuts against the second flat potential. The utility model has the technical effects that the modular performance is good, and the connection performance is good.

Description

A modular crankshaft and RV reducer Technical Field

[0001] This utility model relates to speed reducers, and more particularly to a modular crankshaft and RV speed reducer. Background Technology

[0002] The RV reducer is a type of reducer that combines planetary gear transmission and cycloidal pinwheel transmission. It is widely used in fields with strict motion control requirements, such as industrial robots, CNC machine tools, and aerospace.

[0003] However, the crankshaft of the relevant RV reducer has poor modularity, requiring the measurement of the eccentricity of the entire crankshaft to select a suitable crankshaft. At the same time, the connection performance of the relevant crankshaft is poor. Summary of the Invention

[0004] Purpose of the utility model: The purpose of this utility model is to provide a modular crankshaft, which not only has good modularity but also good connection performance; another purpose of this utility model is to provide an RV reducer.

[0005] Technical solution:

[0006] A modular crankshaft, comprising:

[0007] Central axis;

[0008] A shape memory alloy assembly fitted over the central shaft;

[0009] Both the first bushing assembly and the second bushing assembly are detachably sleeved on the outside of the shape memory alloy assembly, and the first bushing assembly and the second bushing assembly abut against each other.

[0010] Optionally, the first bushing assembly and the second bushing assembly have the same structure, both including:

[0011] A first bushing body that can be detachably fitted onto the shape memory alloy assembly;

[0012] A second bushing body is fitted onto the body of the first bushing body.

[0013] Optionally, the first bushing body has a first flat shape outside and the second bushing body has a second flat shape inside, with the first flat shape and the second flat shape abutting each other.

[0014] Optionally, the shape memory alloy component includes:

[0015] A shape memory alloy body fitted around the central shaft;

[0016] A PTC heating film and a thermoelectric cooling element are sequentially fitted onto the shape memory alloy body.

[0017] Both the PTC heating film and the thermoelectric cooling element have cutouts.

[0018] Optionally, the shape memory alloy assembly further includes a metal-rubber composite layer sleeved between the PTC heating film and the thermoelectric cooling element.

[0019] Optionally, the central axis includes:

[0020] Shaft body;

[0021] A shoulder is fitted onto the shaft body, and the first shaft sleeve assembly abuts against the shoulder.

[0022] Optionally, it also includes an annular groove provided on the shaft body, with the shape memory alloy assembly located within the annular groove.

[0023] An RV reducer includes a modular crankshaft.

[0024] Beneficial effects:

[0025] (1) Due to the detachable connection, the crankshaft of this solution has good modular performance and can meet the diverse eccentricity design requirements.

[0026] (2) Due to its good modular performance, only the eccentricity of the first bushing assembly and the second bushing assembly needs to be measured to select a suitable crankshaft. There is no need to measure the eccentricity of the entire crankshaft, and the measurement difficulty is low.

[0027] (3) The shape memory alloy components facilitate the prevention of the first bushing assembly and the second bushing assembly from the central shaft through traditional interference fit, thereby achieving a high-rigidity connection without damage and ensuring good connection performance. Attached Figure Description

[0028] Figure 1 is a structural diagram of a modular crankshaft according to Embodiment 1 of this utility model;

[0029] Figure 2 is an exploded view of a modular crankshaft according to Embodiment 1 of this utility model;

[0030] Figure 3 is a structural diagram of the shape memory alloy component of Embodiment 1 of this utility model;

[0031] Figure 4 is one of the cross-sectional views of a modular crankshaft according to Embodiment 1 of this utility model;

[0032] Figure 5 is a second cross-sectional view of a modular crankshaft according to Embodiment 1 of this utility model;

[0033] In the figure: 1. First bushing assembly; 2. Second bushing assembly; 31. First bushing body; 311. First flat section; 32. Second bushing body; 321. Second flat section; 4. Central shaft; 41. Shaft body; 42. Shaft shoulder; 43. Annular groove; 5. Shape memory alloy assembly; 51. Shape memory alloy body; 52. PTC heating film; 53. Metal-rubber composite layer; 54. Thermoelectric cooling element. Detailed Implementation

[0034] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the utility model. Furthermore, it should be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. The terms "first," "second," etc., used in this utility model are provided for the convenience of describing the technical solution of this utility model and have no specific limiting effect; they are all general terms and do not constitute a limitation on the technical solution of this utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict, all of which are within the scope of protection claimed by this utility model.

[0036] Example 1

[0037] As shown in Figures 1-5, this embodiment provides a modular crankshaft, including: a central shaft 4; a shape memory alloy assembly 5 sleeved on the central shaft 4; and a first bushing assembly 1 and a second bushing assembly 2, both detachably sleeved on the shape memory alloy assembly 5, wherein the first bushing assembly 1 and the second bushing assembly 2 abut against each other.

[0038] Specifically, during installation, firstly, the central shaft 4 is fixed with a clamp, and lubricant is applied to the inside of the first bushing assembly 1 and the second bushing assembly 2; then, the shape memory alloy assembly 5 is cooled to the martensitic state and fitted onto the outside of the central shaft 4; next, both the first bushing assembly 1 and the second bushing assembly 2 are fitted onto the outside of the shape memory alloy assembly 5. After the temperature returns to room temperature, the shape memory alloy assembly 5 returns to its designed inner diameter, generating a clamping force to achieve the positioning of the first bushing assembly 1 and the second bushing assembly 2; during disassembly, the shape memory alloy assembly 5 is cooled to the martensitic state, and both the first bushing assembly 1 and the second bushing assembly 2 can be separated from the shape memory alloy assembly 5.

[0039] The detachable sleeve design facilitates the modularity of the crankshaft in this solution. Only the eccentricity of the first bushing assembly 1 and the second bushing assembly 2 needs to be measured to select a suitable crankshaft, without the need to measure the eccentricity of the entire crankshaft, thus reducing measurement difficulty. The shape memory alloy assembly 5 helps to prevent the first bushing assembly 1 and the second bushing assembly 2 from undergoing a traditional interference fit with the central shaft 4, achieving a high-rigidity connection without damage and ensuring good connection performance.

[0040] Furthermore, as shown in Figure 2, the first bushing assembly 1 and the second bushing assembly 2 have the same structure, both including: a first bushing body 31 that is detachably sleeved outside the shape memory alloy assembly 5; and a second bushing body 32 that is sleeved outside the first bushing body 31.

[0041] Specifically, the first bushing body 31 and the second bushing body 32 further enhance the modularity of the crankshaft in this solution, making it easier to increase the adjustment range of the eccentricity of the first bushing assembly 1 or the second bushing assembly 2. It should be noted that although the first bushing assembly 1 and the second bushing assembly 2 have the same structure, their eccentricities are different and can be selected according to actual needs.

[0042] Furthermore, as shown in Figure 2, the first bushing body 31 has a first flat slab 311 on its outer side, and the second bushing body 32 has a second flat slab 321 inside, with the first flat slab 311 and the second flat slab 321 in contact.

[0043] Specifically, the first flat shape 311 and the second flat shape 321 help prevent the first bushing body 31 and the second bushing body 32 from rotating relative to each other.

[0044] Furthermore, as shown in Figure 3, the shape memory alloy component 5 includes: a shape memory alloy body 51 sleeved outside the central shaft 4; a PTC heating film 52 and a thermoelectric cooling element 54 sequentially sleeved outside the shape memory alloy body 51; wherein, both the PTC heating film 52 and the thermoelectric cooling element 54 are provided with slits.

[0045] Specifically, the shape memory alloy body 51 can be made of titanium-nickel alloy, titanium-nickel-niobium alloy, etc. When the temperature is low, the PTC heating film 52 can automatically heat up to keep the shape memory alloy body 51 in a suitable operating temperature range. The thermoelectric cooling element 54 is used to cool the shape memory alloy body 51 to the martensitic state. Since the PTC heating film 52 and the thermoelectric cooling element 54 have poor ductility, the PTC heating film 52 and the thermoelectric cooling element 54 are easily fitted onto the outside of the central shaft 4 through a cut.

[0046] Furthermore, as shown in Figure 3, the shape memory alloy component 5 also includes a metal-rubber composite layer 53 sleeved between the PTC heating film 52 and the thermoelectric cooling element 54.

[0047] Specifically, the metal-rubber composite layer 53 is used to protect the shape memory alloy body 51 and the PTC heating film 52 from external vibration and impact, while also playing a certain role in heat insulation and sound insulation. In order to facilitate the indirect connection of the metal-rubber composite layer 53 to the outside of the central shaft 4, the metal in the metal-rubber composite layer 53 needs to be selected from metals with good ductility such as aluminum and copper.

[0048] Furthermore, as shown in Figure 2, the central shaft 4 includes: a shaft body 41; a shaft shoulder 42 sleeved outside the shaft body 41, with the first shaft sleeve assembly 1 and the shaft shoulder 42 abutting against each other.

[0049] Specifically, the shaft body 41 is used to support the shaft shoulder 42, and the shaft shoulder 42 is used to provide axial limiting performance for the first shaft sleeve assembly 1.

[0050] Furthermore, as shown in Figure 2, it also includes an annular groove 43 provided on the shaft body 41, and the shape memory alloy component 5 is located in the annular groove 43.

[0051] Specifically, the annular groove 43 is used to accommodate the shape memory alloy component 5 and to provide axial restraint for the shape memory alloy component 5.

[0052] As shown in Figures 1-5, this embodiment also provides an RV reducer, including a modular crankshaft of this embodiment.

[0053] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A modular crankshaft, characterized in that, include: A central shaft (4); a shape memory alloy assembly (5) sleeved outside the central shaft (4); a first bushing assembly (1) and a second bushing assembly (2) detachably sleeved outside the shape memory alloy assembly (5), wherein the first bushing assembly (1) and the second bushing assembly (2) abut against each other.

2. A modular crankshaft according to claim 1, characterized in that, The first bushing assembly (1) and the second bushing assembly (2) have the same structure, both including: a first bushing body (31) that is detachably sleeved outside the shape memory alloy assembly (5); and a second bushing body (32) that is sleeved outside the first bushing body (31).

3. A modular crankshaft according to claim 2, characterized in that, The first bushing body (31) has a first flat surface (311) on its outside, and the second bushing body (32) has a second flat surface (321) inside, and the first flat surface (311) and the second flat surface (321) are in contact.

4. A modular crankshaft according to any one of claims 1-3, characterized in that, The shape memory alloy assembly (5) includes: a shape memory alloy body (51) sleeved outside the central shaft (4); a PTC heating film (52) and a thermoelectric cooling chip (54) sleeved outside the shape memory alloy body (51) in sequence; wherein, both the PTC heating film (52) and the thermoelectric cooling chip (54) are provided with slits.

5. A modular crankshaft according to claim 4, characterized in that, The shape memory alloy component (5) also includes a metal-rubber composite layer (53) sleeved between the PTC heating film (52) and the thermoelectric cooling chip (54).

6. A modular crankshaft according to any one of claims 1-3, characterized in that, The central shaft (4) includes: a shaft body (41); a shoulder (42) sleeved outside the shaft body (41), wherein the first shaft sleeve assembly (1) and the shoulder (42) abut against each other.

7. A modular crankshaft according to claim 6, characterized in that, It also includes an annular groove (43) provided on the shaft body (41), and the shape memory alloy component (5) is located in the annular groove (43).

8. An RV reducer, characterized in that, Includes a modular crankshaft as described in any one of claims 1-7.

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