High-precision rigid framework structure for speed reducer

Abstract

The utility model discloses a high-precision rigid framework structure for a speed reducer, which belongs to the technical field of machinery and is characterized in that a plurality of first inner bearing blind holes and a plurality of framework supporting columns are uniformly and alternately arranged at the first end of an output framework disc along the circumferential direction, and a first cylindrical positioning pin hole and a plurality of threaded holes are formed in the end surface of each framework supporting column; a plurality of second inner bearing through holes corresponding to the first inner bearing blind holes, a plurality of second cylindrical positioning pin holes corresponding to the first cylindrical positioning pin holes, and a plurality of inner hexagonal countersunk thread via holes corresponding to the threaded holes are formed in the input connecting disc; and the output framework disc and the input connecting disc are locked and fixed into a whole through a cylindrical positioning pin and an inner hexagonal countersunk bolt. According to the utility model, the requirement of an extremely precise robot RV speed reducer can be met, the manufacturing precision, the assembly precision and the overall use performance of a rigid framework structure are improved, the reject ratio is reduced, and the processing cost is relatively low.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology, specifically relating to a high-precision rigid frame structure for a speed reducer. Background Technology

[0002] The skeleton structure used in current robot RV reducers has extremely high requirements for transmission accuracy, is complex, has high manufacturing costs, poor load-bearing capacity, and a high failure rate.

[0003] The current design and manufacturing of RV reducers result in a thinner structure due to the large countersunk holes at the ends of the output structure for gear mounting. This weakens the bending and tensile strength of the parts, making them prone to cracking under heavy loads. Additionally, the coaxiality of the bearing holes at the front and rear of the frame is poor, leading to substandard quality and low precision in the overall reducer. Utility Model Content

[0004] To solve the above problems, the present invention adopts the following technical solution:

[0005] A high-precision rigid frame structure for a speed reducer includes:

[0006] The output skeleton disk is cylindrical. The first end of the output skeleton disk is evenly and alternately provided with a plurality of first inner bearing blind holes and a plurality of skeleton support columns. The end face of each skeleton support column is provided with a first cylindrical positioning pin hole and a plurality of threaded holes. The outer edge of the first end of the output skeleton disk is provided with a first main bearing position and its bearing step.

[0007] The input connection plate is cylindrical. It has multiple second inner bearing through holes corresponding to the first inner bearing blind holes, multiple second cylindrical positioning pin holes corresponding to the first cylindrical positioning pin holes, and multiple internal hexagon countersunk threaded through holes corresponding to the threaded holes. The outer edge of the first end of the input connection plate is provided with a second main bearing seat. The output skeleton plate and the input connection plate are locked and fixed together by cylindrical positioning pins and internal hexagon countersunk bolts.

[0008] Furthermore, both the first inner bearing blind hole and the skeleton support column are set to n, where 2≤n≤6.

[0009] Furthermore, the skeleton support column is set at a certain angle θ with the first inner bearing blind hole, 30°≤θ≤90°, and the second cylindrical positioning pin hole is set at a certain angle θ with the second inner bearing through hole, 30°≤θ≤90°.

[0010] Furthermore, the output connection end face of the output skeleton disk is provided with a mating threaded hole, and the inner hole is provided with a skeleton end cap press-fit hole; the inner hole of the input connection disk is provided with an input clearance hole; and the inside of the second inner bearing through hole is provided with a snap ring position.

[0011] Furthermore, the concentricity of the first inner bearing blind hole and the corresponding second inner bearing through hole, as well as the tolerance of their cylindricity, are both within 0.002 mm.

[0012] Furthermore, the tolerances for the perpendicularity of the first inner bearing blind hole to the axis of the output skeleton disk and the perpendicularity of the second inner bearing through hole to the axis of the input connecting disk are both within 0.002 mm.

[0013] Furthermore, the concentricity of the first main bearing position and the second main bearing position, as well as the tolerance of their cylindricity, are both within 0.005 mm.

[0014] Furthermore, the tolerances for the perpendicularity of the first main bearing position to the axis of the output skeleton disk and the perpendicularity of the second main bearing position to the axis of the input connection disk are both within 0.005 mm, and the surface finish is within Ra0.4.

[0015] Furthermore, 2-3 of each of the threaded holes and the countersunk internal hexagonal threaded through holes are provided.

[0016] Beneficial effects:

[0017] This invention can achieve an overall precision uniformity of the rigid frame structure within 0.003mm or even higher, which can meet the requirements of extremely precise robot RV reducers. It not only improves the manufacturing and assembly precision of the rigid frame structure, but also enhances the overall performance and reduces the defect rate, while making the processing cost relatively low. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the output skeleton disk structure of this utility model;

[0021] Figure 4 This is a schematic cross-sectional view of the output skeleton disk structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the input connection disk structure of this utility model;

[0023] Figure 6This is a cross-sectional view and front view of the input connection disk of this utility model.

[0024] The components include: 1. Output frame plate; 2. Input connection plate; 3. Frame end cap; 4. Cylindrical locating pin; 5. First main bearing position; 6. Second main bearing position; 7. First inner bearing blind hole; 8. Second inner bearing through hole; 9. Output connection end face; 10. Frame support column; 11. Socket countersunk bolt; 201. First cylindrical locating pin hole; 202. Threaded hole; 203. Frame end cap hole; 204. Bearing step; 301. Input clearance hole; 302. Snap ring position; 303. Socket countersunk through hole. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] Example 1

[0031] refer to Figures 1-6A high-precision rigid frame structure for a speed reducer, comprising:

[0032] Output skeleton disk 1 is a cylinder. The first end of the output skeleton disk 1 is evenly and alternately provided with multiple first inner bearing blind holes 7 and multiple skeleton support columns 10. The end face of each skeleton support column 10 is provided with a first cylindrical positioning pin hole 201 and multiple threaded holes 202. The outer edge of the first end of the output skeleton disk 1 is provided with a first main bearing seat 5 and its bearing step 204.

[0033] The input connection plate 2 is cylindrical. It has multiple second inner bearing through holes 8 corresponding to the first inner bearing blind holes 7, multiple second cylindrical positioning pin holes corresponding to the first cylindrical positioning pin holes 201, and multiple internal hexagon countersunk threaded through holes 303 corresponding to the threaded holes 202. The first end outer edge of the input connection plate 2 is provided with a second main bearing seat 6. The output skeleton plate 1 and the input connection plate 2 are locked and fixed together as one unit by the cylindrical positioning pins 4 and the internal hexagon countersunk bolts 11.

[0034] In this embodiment, both the first inner bearing blind hole 7 and the skeleton support column 10 are set to n, where 2≤n≤6.

[0035] In this embodiment, the skeleton support column 10 is set at a certain angle θ with the first inner bearing blind hole 7, 30°≤θ≤90°, and the second cylindrical positioning pin hole is set at a certain angle θ with the second inner bearing through hole 8, 30°≤θ≤90°.

[0036] For example, when n=2, that is, there are two skeleton support columns 10 and two blind holes 7 in the first inner bearing, and they are evenly distributed on the output skeleton disk 1. At this time, the θ between the skeleton support column 10 and the blind hole 7 in the first inner bearing is 90°, and so on.

[0037] Preferably, the cross-section of the frame support column 10 is an isosceles trapezoid.

[0038] In this embodiment, the output connection end face 9 of the output skeleton disk 1 is provided with a mating threaded hole, and the inner hole is provided with a skeleton cover hole 203. The skeleton cover 3 is installed in the skeleton cover hole 203 to facilitate later assembly and sealing and lubrication of the whole machine. The inner hole of the input connection disk 2 is provided with an input clearance hole 301, and the inside of the second inner bearing through hole 8 is provided with a snap ring position 302.

[0039] In this embodiment, the concentricity of the first inner bearing blind hole 7 and the corresponding second inner bearing through hole 8, as well as the tolerance of their cylindricity, are both within 0.002 mm.

[0040] In this embodiment, the tolerances for the perpendicularity of the first inner bearing blind hole 7 to the axis of the output skeleton disk 1 and the perpendicularity of the second inner bearing through hole 8 to the axis of the input connecting disk 2 are both within 0.002 mm.

[0041] In this embodiment, the concentricity of the first main bearing position 5 and the second main bearing position 6, as well as the tolerance of their cylindricity, are both within 0.005 mm.

[0042] In this embodiment, the tolerances for the perpendicularity of the first main bearing position 5 to the axis of the output skeleton disk 1 and the perpendicularity of the second main bearing position 6 to the axis of the input connection disk 2 are both within 0.005mm, and the surface finish is within Ra0.4.

[0043] Preferably, 2-3 threaded holes 202 and internal hexagon countersunk threaded through holes 303 are provided.

[0044] Example 2

[0045] This embodiment describes a machining method for a high-precision rigid frame structure for a speed reducer, as described in Embodiment 1. The method includes the following steps:

[0046] S10. First, design the output skeleton disk 1 and the input connection disk 2 in 3D, and design the corresponding blank drawing, 2D rough machining drawing and 2D finish machining drawing.

[0047] S20. Make output skeleton disk 1, input connection disk 2 blanks and accessories, including forging molds, rough machining tooling and fine machining tooling;

[0048] S30. Perform heat treatment and tempering on the output skeleton disk 1 and input connecting disk 2 blanks.

[0049] S40. Fix the output skeleton disk 1 blank on its rough machining fixture and place it in the CNC machining center for rough machining, leaving a 1.5-2mm allowance.

[0050] S50. Fix the input connection plate 2 on its roughing fixture and place it in the CNC machining center for roughing, leaving a 1.5-2mm allowance.

[0051] S60. After semi-finishing and roughing, output skeleton disk 1 and input connecting disk 2 are semi-finished and roughed. The upper end face of the skeleton support column 10 of output skeleton disk 1 and the end face of the second main bearing position 6 of input connecting disk 2 are finished to ensure their flatness, perpendicularity to the body axis and end face smoothness. The corresponding positioning pin holes, bolt through holes and threaded holes 202 are machined according to the drawings.

[0052] S70. Position the semi-finished part of the output skeleton disk 1 and the semi-finished part of the input connection disk 2 by means of the cylindrical positioning pin 4, and then lock them together by means of the internal hexagon countersunk bolt 11.

[0053] S80. The locked semi-finished rigid skeleton structure is fixed on the engraving machine by the finishing fixture and then finished, so that the first main bearing position 5 and the second main bearing position 6 are finished in one go, and the first inner bearing blind hole 7 and the corresponding second inner bearing through hole 8 are finished in one go, so as to fully ensure their concentricity.

[0054] This invention can achieve an overall precision uniformity of the rigid frame structure within 0.003mm or even higher, which can meet the requirements of extremely precise robot RV reducers. It not only improves the manufacturing and assembly precision of the rigid frame structure, but also enhances the overall performance and reduces the defect rate, while making the processing cost relatively low.

[0055] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A high-precision rigid frame structure for a speed reducer, characterized in that, include: The output skeleton disk is cylindrical. The first end of the output skeleton disk is evenly and alternately provided with a plurality of first inner bearing blind holes and a plurality of skeleton support columns. The end face of each skeleton support column is provided with a first cylindrical positioning pin hole and a plurality of threaded holes. The outer edge of the first end of the output skeleton disk is provided with a first main bearing position and its bearing step. The input connection plate is cylindrical. It has multiple second inner bearing through holes corresponding to the first inner bearing blind holes, multiple second cylindrical positioning pin holes corresponding to the first cylindrical positioning pin holes, and multiple internal hexagon countersunk threaded through holes corresponding to the threaded holes. The outer edge of the first end of the input connection plate is provided with a second main bearing seat. The output skeleton plate and the input connection plate are locked and fixed together by cylindrical positioning pins and internal hexagon countersunk bolts.

2. The high-precision rigid frame structure for a speed reducer according to claim 1, characterized in that, The first inner bearing blind hole and the skeleton support column are both set to n, where 2≤n≤6.

3. The high-precision rigid frame structure for a speed reducer according to claim 1, characterized in that, The skeleton support column is set at a certain angle θ with the first inner bearing blind hole, 30°≤θ≤90°, and the second cylindrical positioning pin hole is set at a certain angle θ with the second inner bearing through hole, 30°≤θ≤90°.

4. The high-precision rigid frame structure for a speed reducer according to claim 1, characterized in that, The output connection end face of the output skeleton disk is provided with a mating threaded hole, and the inner hole is provided with a skeleton end cap press-fit hole. The inner hole of the input connection disk is provided with an input clearance hole, and the inside of the second inner bearing through hole is provided with a snap ring position.

5. The high-precision rigid frame structure for a speed reducer according to claim 1, characterized in that, The concentricity of the first inner bearing blind hole and the corresponding second inner bearing through hole, as well as the tolerance of their cylindricity, are both within 0.002 mm.

6. The high-precision rigid frame structure for a speed reducer according to claim 1, characterized in that, The perpendicularity of the first inner bearing blind hole to the axis of the output skeleton disk and the perpendicularity of the second inner bearing through hole to the axis of the input connecting disk are both within 0.002 mm.

7. The high-precision rigid frame structure for a speed reducer according to claim 1, characterized in that, The concentricity of the first main bearing position and the second main bearing position, as well as the tolerance of their cylindricity, are both within 0.005 mm.

8. The high-precision rigid frame structure for a speed reducer according to claim 1, characterized in that, The perpendicularity tolerances of the first main bearing position to the axis of the output skeleton disk and the perpendicularity tolerances of the second main bearing position to the axis of the input connection disk are both within 0.005 mm, and the surface finish is within Ra0.

4.

9. The high-precision rigid frame structure for a speed reducer according to claim 1, characterized in that, Both the threaded hole and the countersunk internal hexagonal threaded through hole are provided in 2-3 portions.

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