Auxiliary tool for machining radial pin hole of torque arm bearing hole of wind power gear box
By designing an auxiliary tooling with a flange structure, the problems of long clamping time, low efficiency, and difficulty in ensuring accuracy in the machining of radial pin holes for the torsion arm bearing holes in wind turbine gearboxes were solved, achieving efficient and low-cost hole position accuracy control.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2026-03-13
AI Technical Summary
Existing technologies for machining radial pin holes in the torque arm bearing of wind turbine gearboxes suffer from problems such as long clamping time, low machining efficiency, high cost, and difficulty in guaranteeing hole position accuracy.
An auxiliary tooling with an integral flange structure is used. It is fixed to the torque arm by tooling bolts and radial pin hole machining is performed using an electric drill. The tooling has through holes on its shaft diameter to ensure hole position accuracy and is suitable for torque arms with different inner diameters.
It simplifies the processing flow, improves processing efficiency, reduces costs, ensures the positional accuracy and versatility of the pin holes, and avoids machine tool waiting time and the instability of manual hand-held drilling.
Smart Images
Figure CN223989292U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wind turbine gearbox processing tooling, specifically to auxiliary tooling for processing radial pin holes of torsion arm bearing holes in wind turbine gearboxes. Background Technology
[0002] Wind power generation has experienced rapid development in recent years due to its advantages such as being pollution-free and having low construction costs. The machining efficiency of internal gearbox components plays a crucial role. The gearbox is often connected to the nacelle via a torque arm, which requires various machining tools during its fabrication.
[0003] Currently, when machining the radial pin hole inside the bearing bore of a torque arm, the torque arm is usually placed on a vertical machining center. To ensure clamping stability, the mating surface of the torque arm is placed on the machine tool's worktable during machining on the vertical machining center. Since the machine tool's spindle is perpendicular to the mating surface of the torque arm, and the radial pin hole of the bearing bore is also perpendicular to the machine tool's spindle, machining the radial pin hole of the bearing bore on a vertical machining center requires installing a right-angle head on the machine tool's spindle. This method is not only time-consuming but also significantly reduces the machining efficiency of the parts, resulting in wasted production capacity.
[0004] The technical solution of existing technology 1 is as follows:
[0005] The torque arm is placed directly on a vertical machining center to machine the radial pin hole inside the bearing hole.
[0006] The disadvantages of existing technology 1 are:
[0007] 1. Before the torque arm is placed on the vertical machining center for processing, it needs to be fixed on the machine tool's worktable. The torque arm clamping and fixing takes time, and the machine tool waits for a long time, resulting in a waste of machine tool capacity.
[0008] 2. When machining the radial pin hole of the torque arm bearing on a vertical machining center, it is necessary to reposition the workpiece, which takes a long time.
[0009] 3. Vertical machining center equipment has higher processing costs, resulting in higher processing costs for parts.
[0010] The technical solution of existing technology 2 is as follows:
[0011] By manually marking the positions where radial pin holes are required to be machined in the torque arm bearing hole, the positions can be machined directly using an electric drill.
[0012] The disadvantages of the existing technology 2 are:
[0013] 1. Since the bearing hole of the torque arm is circular, it is difficult to control the force of the drill bit when manually drilling the hole on the arc surface with a hand-held electric drill. This may result in a slanted hole, which will affect the assembly of the parts.
[0014] 2. Manually using a handheld electric drill for machining cannot guarantee the axial distance from the center of the machined pin hole to the end face of the torque arm, which will also affect the subsequent use of the pin hole. Utility Model Content
[0015] This utility model provides an auxiliary tooling for machining radial pin holes in the torsion arm bearing of a wind turbine gearbox. Its purpose is to overcome the shortcomings of the existing technology and enable the pin holes that meet the requirements to be machined using a hand drill.
[0016] The technical solution adopted by this utility model to solve its technical problem is:
[0017] Auxiliary tooling for machining radial pin holes in torsion arm bearings of wind turbine gearboxes, characterized in that:
[0018] The tooling is a flange structure, and the flange of the tooling has more than three axial threaded holes. The tooling bolts are screwed into the threaded holes on the flange of the tooling, and the lower end of the tooling bolts contacts the cover plate surface of the torque arm.
[0019] The tooling shaft is inserted into the bearing hole of the torque arm;
[0020] The tooling has three or more radial threaded holes on its shaft diameter. The tooling bolts are screwed into the threaded holes on the shaft diameter of the tooling. The lower end of the tooling bolts is in close contact with the inner wall of the bearing hole of the torque arm to fix the tooling to the torque arm.
[0021] A radial through hole is made on the shaft diameter of the tooling, and the size of the radial through hole on the shaft diameter is larger than the size of the radial pin hole to be machined in the bearing hole of the torque arm.
[0022] The tooling has four axial threaded holes on its flange, which are evenly distributed around the circumference.
[0023] The tooling has four radial threaded holes on its shaft diameter, which are evenly distributed around the circumference.
[0024] The outer diameter of the tooling shaft is smaller than the inner diameter of the bearing bore of the torque arm.
[0025] The advantages of this utility model are:
[0026] 1. The tooling structure is simple and easy to process and manufacture;
[0027] 2. No machining center is required. With this tooling, machining can be completed using only an electric drill, which can effectively ensure the position and size of the radial pin hole of the torque arm bearing, saving machining costs.
[0028] 3. Easy to assemble and disassemble, requiring no other workpiece clamping fixtures;
[0029] 4. Using auxiliary tooling for machining radial pin holes in torque arm bearings eliminates the need to align the workpiece's center. The relative position of the pin holes can be ensured without calibrating the workpiece before machining, thus improving machining efficiency.
[0030] 5. This fixture uses four evenly distributed bolts installed on the fixture shaft diameter to contact the torque arm bearing hole. The bolt extension length is controlled by tightening the bolts, making it suitable for torque arm bearing holes with different inner diameters. This enhances the versatility of the fixture. Attached Figure Description
[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0032] Figure 1 This is a top view of the present invention;
[0033] Figure 2 for Figure 1 AA section view;
[0034] Figure 3 for Figure 1 BB cross-sectional view. Detailed Implementation
[0035] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort. To facilitate understanding of this utility model, a more detailed description of this utility model will be provided below in conjunction with the accompanying drawings and specific embodiments.
[0036] It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "inner," "outer," "bottom," etc., used in this specification 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 present invention 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 of the present invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0037] like Figure 1 , Figure 2 , Figure 3 As shown:
[0038] This utility model is an auxiliary tooling for machining the radial pin hole of the torque arm bearing hole in a wind turbine gearbox.
[0039] The fixture 2 is an integral flange structure. Four circumferentially distributed axial threaded holes 211 are pre-machined on the flange 21 of the fixture 2. Four fixture bolts 3 are respectively screwed into the four pre-machined threaded holes 211 on the flange 21 of the fixture 2.
[0040] The lower end of the tooling bolt 3 contacts the cover plate surface 11 of the torque arm 1. The shaft diameter 22 of the tooling 2 needs to be inserted into the bearing hole 10 of the torque arm 1. The outer diameter of the shaft diameter 22 of the tooling 2 is smaller than the inner diameter of the bearing hole 10 of the torque arm 1. That is, there is a certain gap F between the shaft diameter 22 of the tooling 2 and the inner wall of the bearing hole 10 of the torque arm 1. There are 4 evenly distributed radial threaded holes 222 on the shaft diameter 22 of the tooling 2. The 4 tooling bolts 4 are screwed onto the threaded holes 222 on the shaft diameter of the tooling 2. By tightening the tooling bolts 4, the extension length of the tooling bolts 4 is controlled so that the head of the tooling bolts 4 is in the most suitable position to tightly contact the inner wall of the bearing hole 10 of the torque arm 1, thereby fixing the tooling 2 and the torque arm 1.
[0041] Based on the size of the radial pin hole 8 to be machined in the bearing hole 10 of the torque arm 1, a radial through hole 221 is pre-machined on the shaft diameter 22 of the tooling 2. The size of the through hole 221 is larger than the size of the radial pin hole 8 and can pass through the drill bit 101 of the electric drill 100.
[0042] Before fixing fixture 2 onto the workpiece torque arm 1, the following dimensions need to be determined: Dimension C is the distance from the axis of the radial pin hole 8 to be machined inside the bearing hole 10 of torque arm 1 to the cover plate surface 11 of torque arm 1; dimension E is the distance from the axis of the radial pin hole 8 to be machined inside the bearing hole 10 of torque arm 1 to the flange end face 212 of fixture 2; and dimension D is the distance from the flange end face 212 of fixture 2 to the cover plate surface 11 of torque arm 1. Figure 2 It can be seen that dimension C = dimension E - dimension D. Therefore, by controlling the extension length of the tooling bolt 3 downwards from the tooling 2, the distance from the axis of the pre-machined radial through hole 221 on the shaft diameter 22 of the tooling 2 to the cover plate surface 11 of the torque arm 1 can be adjusted.
[0043] After adjustment, fix the fixture 2 onto the torque arm 1, and use the electric drill 100 to process it. Pass the drill bit 101 of the electric drill 100 through the radial through hole 221 pre-machined on the shaft diameter 22 of the fixture 2, and then machine the radial pin hole 8 to be machined in the bearing hole 10.
[0044] Figure 3 As can be seen, the fixture 2 is fixed to the torque arm 1 by the fixture bolts 4. The shaft diameter 22 of the fixture 2 has four radially threaded holes 222 evenly distributed around its circumference. The four fixture bolts 4 are screwed into the four threaded holes 222 on the shaft diameter 22 of the fixture 2. By tightening the fixture bolts 4, the extension length of the fixture bolts 4 is controlled so that the head of the fixture bolt 4 is in the most suitable position to tightly contact and fix the bearing hole 10 of the torque arm 1.
[0045] The existing method for machining radial locating pins in the bearing holes of torque arms involves machining them directly on a vertical machining center or using a hand drill. The required spindle coordinates must be calculated in advance based on the distance between the radial pin hole of the bearing hole and the cover plate surface of the torque arm. A side milling head needs to be replaced, and the machining accuracy of the machine tool must be ensured. Specialized fixtures are also required to clamp and fix the torque arm before machining. To ensure the position of the radial pin hole in the bearing hole of the torque arm, the workpiece needs to be aligned before machining. This method is often inefficient.
[0046] This fixture uses a single, integrated flange sleeve-type fixture. The fixture's shaft diameter can be directly inserted into the bearing hole of the torque arm for fixation. Bolts are installed on the flange of the fixture. By adjusting the extension length of the bolts, the distance between the radial through hole on the fixture's shaft diameter and the cover plate surface of the torque arm can be controlled. This method ensures the position of the pin hole to be machined. Simultaneously, the fixture's shaft diameter contacts the bearing hole of the torque arm via four bolts. Tightening these four bolts, which mate with the radial threaded holes on the shaft diameter, forms a four-point contact fixation. The bolt extension length is adjustable, therefore this fixture is applicable to torque arms with different hole diameters, offering greater versatility.
[0047] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. An auxiliary tool for processing a radial pin hole of a torsion arm bearing hole of a wind turbine gearbox, characterized in that: The tool is a flange structure, the tool flange has more than three axial threaded holes, the tool bolts are respectively screwed and installed on the threaded holes of the tool flange, the lower end of the tool bolt is in contact with the cover plate of the torque arm; the shaft diameter of the tool is inserted into the bearing hole of the torque arm; more than three radial threaded holes are opened on the upper surface of the shaft diameter of the tool, the tool bolts are respectively screwed and installed on the threaded holes on the shaft diameter of the tool, the lower end of the tool bolt is in close contact with the inner wall of the bearing hole of the torque arm to fix the tool and the torque arm; a radial through hole is opened on the upper surface of the shaft diameter of the tool, the size of the radial through hole opened on the upper surface of the shaft diameter is greater than the size of the radial pin hole to be machined in the inner wall of the bearing hole of the torque arm.
2. The auxiliary tool for machining the radial pin hole of the torsion arm bearing of the wind turbine gearbox according to claim 1, characterized in that: The axial threaded holes on the tool flange are four and are uniformly distributed in the circumference.
3. The auxiliary tool for machining the radial pin hole of the torsion arm bearing of the wind turbine gearbox according to claim 1, characterized in that: The radial threaded holes on the shaft diameter of the tool are four and are uniformly distributed in the circumference.
4. The auxiliary tool for machining the radial pin hole of the torsion arm bearing of the wind turbine gearbox according to claim 1, characterized in that: The outer diameter of the shaft diameter of the tool is smaller than the inner diameter of the bearing hole of the torque arm.