A machining tool for a drone crankshaft
Patent Information
- Application Number
- CN202522093111.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-28
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-09-28
AI Technical Summary
[0003]减二曲轴三偏心连体结构的R角精磨过程中，三个偏心部分的位置精度控制困难（减二曲轴的偏心部分与夹盘同一轴线，偏心部分需要轮换），在多次装夹过程中容易产生累积误差，需要后续人工修整，增加了成本，急需对此做出相应改进
[0012]本实用新型的优点在于：采用机械分度结构，并通过锁紧螺栓锁紧分度件、减二曲轴，无需多次装夹以避免累积误差；分度件的外壁设置有三个分度平面，偏心部分对应三个分度平面；通过第二锁紧螺栓锁紧减二曲轴，通过第一锁紧螺栓锁紧分度件；曲轴的旋转中心始终与磨床夹盘的回转中心保持一致，不会因分度转动出现中心偏移，减二曲轴的轴肩抵靠于定位段以定位减二曲轴；垫块以平面接触的压紧方式能提供更大的摩擦力和更稳定的锁紧力，从而锁紧分度件；松开分度件时，第一锁紧螺栓带着垫块外移，垫块收纳到容纳槽内，不会影响到分度件的转动；螺孔能确保第二锁紧螺栓与减二曲轴的中心轴轴线垂直，压紧力直接作用于曲轴以锁紧曲轴。
Smart Images
Figure CN224658926U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of unmanned aerial vehicle (UAV) crankshafts, and particularly to a machining fixture for UAV crankshafts. Background Technology
[0002] The reduction gear crankshaft is a key component in the UAV fan blade transmission system. It employs a triple-eccentric integrated structure design, primarily used to convert the high-speed rotational motion of the motor into a specific oscillating trajectory of the fan blades. This structure consists of three eccentric cranks, each with a strict radius (R) requirement at its root, while maintaining a precise relative positional relationship between the three eccentric parts. During UAV operation, the reduction gear crankshaft is subjected to complex alternating loads and centrifugal forces from high-speed rotation; its machining quality directly affects transmission efficiency, vibration noise, and service life.
[0003] During the R-angle precision grinding process of the three eccentric integrated structure of the reduction gear crankshaft, it is difficult to control the positional accuracy of the three eccentric parts (the eccentric part of the reduction gear crankshaft is on the same axis as the chuck, and the eccentric parts need to be rotated). Accumulated errors are easily generated during multiple clamping processes, requiring subsequent manual adjustment, which increases costs. There is an urgent need to make corresponding improvements. Summary of the Invention
[0004] In view of this, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a machining fixture for the crankshaft of a drone.
[0005] This utility model provides a machining fixture for a drone crankshaft, which is installed on the chuck 7 of a grinding machine. It includes a mounting block 1 installed on the chuck 7, and an indexing component 2 is rotatably mounted on the mounting block 1. The outer wall of the indexing component 2 is provided with three indexing planes 2.4. The indexing component 2 is locked to the mounting block 1 by a first locking bolt 3. The center of the indexing component 2 is coaxially provided with a positioning hole for positioning a reduction crankshaft. The reduction crankshaft is locked to the indexing component 2 by a second locking bolt 5 located on the front side of the mounting block 1.
[0006] Furthermore, the indexing component 2 is composed of an indexing section 2.2 in the middle, a rotating section 2.1 on the rear side, and a positioning section 2.3 on the front side. The indexing section 2.2, the rotating section 2.1, and the positioning section 2.3 are arranged coaxially.
[0007] Furthermore, the indexing plane 2.4 is disposed on the outer wall of the indexing segment 2.3.
[0008] Furthermore, the end of the first locking bolt 3 is provided with a pad 4 that presses against the indexing plane 2.4.
[0009] Furthermore, the mounting block 1 has a rotating hole for the indexing member 2 to rotate, and the left end of the rotating hole has a receiving groove 6 for accommodating the pad block 4.
[0010] Furthermore, a screw hole 2.5 is vertically provided on one of the indexing planes 2.4, which is for threading the second locking bolt 5 and is located on the front side of the mounting block 1.
[0011] Furthermore, the upper and lower edges of the left end of the mounting block 1 are both rounded.
[0012] The advantages of this utility model are as follows: It adopts a mechanical indexing structure and locks the indexing component and the reduction gear crankshaft with locking bolts, eliminating the need for multiple clamping operations to avoid accumulated errors; the outer wall of the indexing component has three indexing planes, with the eccentric portion corresponding to the three indexing planes; the reduction gear crankshaft is locked by the second locking bolt, and the indexing component is locked by the first locking bolt; the rotation center of the crankshaft is always consistent with the rotation center of the grinding machine chuck, preventing center offset due to indexing rotation; the shoulder of the reduction gear crankshaft abuts against the positioning section to position the reduction gear crankshaft; the pad provides greater friction and more stable locking force through planar contact pressing, thus locking the indexing component; when the indexing component is loosened, the first locking bolt moves the pad outward with it, and the pad is stored in the receiving groove without affecting the rotation of the indexing component; the screw hole ensures that the second locking bolt is perpendicular to the central axis of the reduction gear crankshaft, and the clamping force acts directly on the crankshaft to lock it. Attached Figure Description
[0013] Figure 1 This is a perspective view of the present utility model; Figure 2 This is the front view of the present invention; Figure 3 for Figure 2 AA section view; Figure 4 This is a schematic diagram of the structure of the present invention installed on the grinding machine chuck and clamping the reduction crankshaft. Detailed Implementation
[0014] The present invention will now be described in detail with reference to the accompanying drawings.
[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.
[0016] See Figures 1 to 4This utility model provides a machining fixture for a drone crankshaft, which is installed on the chuck 7 of a grinding machine. It includes a mounting block 1 installed on the chuck 7, and an indexing component 2 is rotatably mounted on the mounting block 1. The outer wall of the indexing component 2 is provided with three indexing planes 2.4. This is a mechanical indexing structure. The reduction gear crankshaft has three eccentric parts, and the eccentric parts correspond to the three indexing planes. The middle vertical plane of the indexing plane coincides with the central axis of the reduction gear crankshaft. The indexing component 2 is locked to the mounting block 1 by a first locking bolt 3. The center of the indexing component 2 is coaxially provided with a positioning hole for positioning the reduction gear crankshaft. The reduction gear crankshaft is locked to the indexing component 2 by a second locking bolt 5 located on the front side of the mounting block 1. Place the center shaft of the reduction gear crankshaft into the positioning hole of the indexing component. The operator measures and adjusts the angle of the reduction gear crankshaft so that the eccentric part of the reduction gear crankshaft corresponds to the indexing plane (the axis of the eccentric part coincides with the middle vertical plane of the indexing plane). Tighten the second locking bolt to lock the reduction gear crankshaft. After machining the R angle of the first eccentric part, loosen the first locking bolt to loosen the indexing component. Rotate the indexing component and the reduction gear crankshaft on it so that the next indexing plane corresponds to the first locking bolt. Tighten the first locking bolt to lock the indexing component. Machin the R angle of the next eccentric part. Machin the R angle of the three eccentric parts according to the above steps. After loosening the second locking bolt, remove the reduction gear crankshaft. Multiple clamping is not required to avoid cumulative errors.
[0017] See Figure 1 , Figure 3 The indexing component 2 consists of an indexing section 2.2 in the middle, a rotating section 2.1 on the rear side, and a positioning section 2.3 on the front side. The indexing section 2.2, the rotating section 2.1, and the positioning section 2.3 are arranged coaxially, and the indexing plane 2.4 is set on the outer wall of the indexing section 2.3. The rotation center of the crankshaft is always consistent with the rotation center of the grinding machine chuck, and there will be no center offset due to the indexing rotation. The shoulder of the reduction gear crankshaft abuts against the positioning section to position the reduction gear crankshaft.
[0018] The end of the first locking bolt 3 is provided with a pad 4 that presses against the indexing plane 2.4. The pad provides greater friction and more stable locking force through the planar contact pressing method, thereby locking the indexing component.
[0019] The mounting block 1 has a rotating hole for the indexing component 2 to rotate, and a receiving groove 6 for accommodating the pad 4 is provided at the left end of the rotating hole. When the indexing component is loosened, the first locking bolt moves the pad outward with it, and the pad is stored in the receiving groove, which will not affect the rotation of the indexing component.
[0020] A screw hole 2.5 is vertically provided on one of the indexing planes 2.4, for threading a second locking bolt 5 and located on the front side of the mounting block 1. The screw hole ensures that the second locking bolt is perpendicular to the central axis of the reduced-voltage crankshaft, and the clamping force is directly applied to the crankshaft to lock it.
[0021] The top and bottom edges of the left end of mounting block 1 are rounded.
[0022] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A machining fixture for a UAV crankshaft, mounted on the chuck of a grinding machine, characterized in that: The device includes a mounting block installed on the clamp, an indexing component rotatably mounted on the mounting block, three indexing planes on the outer wall of the indexing component, the indexing component being locked to the mounting block by a first locking bolt, and a positioning hole for positioning a reduction gear crankshaft coaxially opened at the center of the indexing component, the reduction gear crankshaft being locked to the indexing component by a second locking bolt located on the front side of the mounting block.
2. The machining fixture for a UAV crankshaft as described in claim 1, characterized in that: The indexing component consists of an indexing section in the middle connected to a rotating section on the rear side and a positioning section on the front side. The indexing section, the rotating section, and the positioning section are arranged on the same axis.
3. The machining fixture for a UAV crankshaft as described in claim 2, characterized in that: The indexing plane is disposed on the outer wall of the indexing segment.
4. The machining fixture for a UAV crankshaft as described in claim 1, characterized in that: The end of the first locking bolt is provided with a pad that presses against the indexing plane.
5. The machining fixture for a UAV crankshaft as described in claim 4, characterized in that: The mounting block has a rotating hole that allows the indexing component to rotate, and the left end of the rotating hole has a receiving groove for accommodating the pad block.
6. The machining fixture for a UAV crankshaft as described in claim 1, characterized in that: One of the indexing planes has a screw hole vertically provided for threading the second locking bolt and located on the front side of the mounting block.
7. The machining fixture for a UAV crankshaft as described in claim 1, characterized in that: The upper and lower edges of the left end of the mounting block are rounded.