Crankshaft spline rough hobbing positioning tool
By designing the crankshaft spline rough hobbing positioning tool, the problem of adding processes in the prior art is solved, and the eccentric hobbing is achieved directly completing eccentric gear hobbing on the lathe, saving process and reducing costs.
Patent Information
- Application Number
- CN202422492200.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-08-08
- Estimated Expiration
- 2034-10-15
AI Technical Summary
In the prior art, crankshafts need to be machined first and then hobbed, and then the lathe is processed eccentricly, which increases the process cost and complexity.
A crankshaft splined rough hobbing positioning tool is designed. By setting a central hole and an eccentric hole on the gear sleeve, and fixing the eccentric circle of the crankshaft with copper head screws to incline, and performing eccentric teeth hobbing directly on the lathe, reducing the process.
The eccentric gear hobbing is achieved directly on the lathe, saving a process, improving processing efficiency and reducing costs.
Smart Images
Figure CN223198193U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of crankshaft spline processing, in particular to a crankshaft spline rough hobbing positioning tool. Background Art
[0002] The splined crankshaft is a common part and an important part of the RV reducer. Its structure is two support circles on both sides, two eccentric circles in the middle, and a spline on one end. There are strict requirements on the phase of the eccentric circles and the splines. Generally, the center of one tooth groove of the spline is required to be aligned with the line connecting the axis center and the center of the eccentric circle. The deviation angle does not exceed 0.03 degrees, and the deviation angle between the eccentric circles is 180 degrees.
[0003] The traditional rough machining process for crankshafts involves turning the crankshaft, rough knurling the spline teeth, and turning the eccentric circle. Heat treatment and other finishing steps are then performed. The rough machining of the eccentric circle depends on the angular position of the spline groove, necessitating the addition of complex positioning tooth tooling or a probing mechanism. The included angle between the rough machined eccentric circle and the spline groove must be within 3 degrees.
[0004] This process requires the crankshaft to be precision-turned first, and then hobbed and then lathe-processed for eccentricity. This process requires two lathe-processes, which increases the process cost. Utility Model Content
[0005] The purpose of the utility model is to provide a crankshaft spline rough hobbing positioning tool, which can avoid the situation in which the crankshaft needs to be precision-turned first, hobbed, and then lathe-machined for eccentricity, which increases the process cost by lathe-machine twice.
[0006] The utility model provides a crankshaft spline rough hobbing positioning tool, comprising a gear sleeve, an eccentric hole is provided at one end of the gear sleeve, a center hole is provided at the center position of the gear sleeve, the center hole and the eccentric hole are connected, the supporting circular sleeve of the crankshaft body is arranged in the eccentric hole, the eccentric circular sleeve of the crankshaft body is arranged in the center hole, and the eccentric circular sleeve of the crankshaft body is fixed by a copper head screw.
[0007] Preferably, the copper head screw is threadedly connected to the threaded hole opened on the side of the gear sleeve.
[0008] Preferably, the end of the copper head screw is movably provided with a turning handle.
[0009] Preferably, the copper head screw presses against the side surface of the eccentric circle of the crank shaft body, so that the eccentric circle of the crank shaft body is tilted to one side.
[0010] Preferably, the ends of the copper head screws are symmetrically provided with limiting grooves, and the interior of the turning handle is symmetrically provided with limiting blocks, which are slidably connected to the limiting grooves.
[0011] Preferably, the position accuracy of the central hole and the eccentric hole is within φ0.01mm, and the hole diameter tolerance is H6.
[0012] Preferably, positioning holes are drilled inside the gear sleeve, and the positioning holes are distributed in a ring shape inside the gear sleeve.
[0013] Preferably, the number of the positioning holes is consistent with the number of teeth on the crankshaft body spline.
[0014] Preferably, the pitch circle of the positioning hole coincides with the center hole, and the concentricity φ 0.02mm
[0015] The position accuracy of a single positioning hole is within φ Within 0.02mm.
[0016] Preferably, the angle between the line connecting the positioning hole closest to the eccentric circle of the crank shaft body and the center hole and the line connecting the eccentric circle hole and the center hole is within 30°.
[0017] Compared with the prior art, the crankshaft spline rough hobbing positioning tool provided in the embodiment of the utility model has the following advantages:
[0018] 1. The central hole and the eccentric circle hole opened by the device of the utility model can be respectively fitted on the support circle and the eccentric circle of the crank shaft body, and matched with the clearance of the crank shaft body, and the copper head screw is used to press the side of the eccentric circle of the crank shaft body to fix the crank shaft body, and ensure that each eccentric circle of the crank shaft body is tilted to one side, so that gear hobbing can be performed according to the angle of the eccentric circle. In this way, the eccentricity can be directly turned on the lathe, saving a process.
[0019] 2. The utility model movably mounts a turning handle on the copper head screw, and the copper head screw is more easily rotated by rotating the turning handle, thereby easily fixing and canceling the crank shaft body. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.
[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;
[0022] Figure 2 This is the second schematic diagram of the overall structure of an embodiment of the present utility model;
[0023] Figure 3 This is a schematic diagram of the connection between the gear sleeve and the crankshaft body structure according to an embodiment of the present invention;
[0024] Figure 4 For the embodiment of the utility model Figure 3 Schematic diagram of the plane structure;
[0025] Figure 5 This is a schematic top view of the gear sleeve and other structures of an embodiment of the utility model;
[0026] Figure 6 For the embodiment of the utility model Figure 5 Schematic diagram of the cross-section structure along AA;
[0027] Figure 7 This is a schematic diagram of the marking state of the center hole and eccentric hole structure of an embodiment of the utility model;
[0028] Figure 8 This is a schematic diagram of the copper head screw structure of an embodiment of the present utility model.
[0029] Reference numerals:
[0030] 1. Gear sleeve; 2. Eccentric hole; 3. Center hole; 4. Positioning hole; 5. Threaded hole; 6. Copper head screw; 7. Crank shaft body; 8. Limit groove; 9. Turning handle; 10. Limit block. DETAILED DESCRIPTION
[0031] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.
[0032] Please refer to Figures 1-8 The embodiment of the present invention provides a crankshaft spline rough hobbing positioning tool, including a gear sleeve 1, an eccentric hole 2 is opened at one end of the gear sleeve 1, a center hole 3 is opened at the center position of the gear sleeve 1, and the center hole 3 is connected to the eccentric hole 2.
[0033] The structure of the crankshaft body 7 is that there are two support circles on both sides, two eccentric circles in the middle, and one section is a spline. When fixing the crankshaft body 7, the support circle sleeve of the crankshaft body 7 is set in the eccentric hole 2, and the eccentric circle sleeve of the crankshaft body 7 is set in the center hole 3, and is loosely matched with the crankshaft body 7.
[0034] Among them, the position accuracy of the center hole 3 and the eccentric hole 2 is within φ0.01mm, and the hole diameter tolerance is H6. Then, a positioning hole 4 is drilled inside the gear sleeve 1. The positioning holes 4 are distributed in a ring shape inside the gear sleeve 1. The number of positioning holes 4 is consistent with the number of teeth on the spline of the crank shaft body 7. The pitch circle of the positioning hole 4 coincides with the center hole 3, and the concentricity is within φ0.02mm. The position accuracy of a single positioning hole 4 is within φ0.02mm.
[0035] The angle between the connecting line of the eccentric positioning hole 4 closest to the crankshaft body 7 and the center hole 3 and the connecting line of the eccentric hole and the center hole 3 is within 1 minute.
[0036] A threaded hole 5 is drilled on the side of the gear sleeve 1, and a copper head screw 6 is installed. The copper head screw 6 is rotated so that it presses against the side of the eccentric circle of the crank shaft body 7 to fix the crank shaft body 7, and ensure that the eccentric circle of each crank shaft body 7 is tilted to one side to ensure the stability of the deflection angle.
[0037] Furthermore, a turning handle 9 is movably provided at the end of the copper head screw 6, and a limiting groove 8 is symmetrically provided at the end of the copper head screw 6. A limiting block 10 is symmetrically provided inside the turning handle 9. The limiting block 10 is slidably connected with the limiting groove 8, making the turning handle 9 easier to disassemble. Secondly, when the copper head screw 6 is rotated, the rotation of the turning handle 9 is more convenient.
[0038] During use, the accuracy of the crankshaft body 7 precision-machined parts needs to be controlled, where the eccentricity value needs to be controlled within ±0.01mm, the diameter tolerance of the support circle and the eccentric circle is h6, and the angle tolerance between the two eccentric circles is ±1 minute.
[0039] When hobbing gears, put this tooling on the crankshaft body 7, tighten the side copper head screws 6, adjust the gear hobbing machine probe, detect the teeth on the tooling, and obtain the phase. The groove at the detection point corresponds to the position of the processed spline. Then, roughly roll the crankshaft. After processing, adjust the gear hobbing angle according to the measurement results so that the spline phase and the eccentric circle phase are consistent. Then, batch processing is carried out. After actual processing inspection, the rough rolling angle is basically within ±3 minutes.
[0040] The specific tolerance value can be set according to the requirements of different manufacturers. For example, if the deflection angle requirements are different, the fitting tolerances of each part may also be different.
[0041] like Figure 7 As shown, A is the center of the center hole 3, B is the center of the eccentric hole 2, and C is the center of the tooth groove. The angle between AC and AB is the required angle between the tooth groove and the eccentric hole 2 relative to the center hole 3. In order to ensure the processing accuracy, Figure 7 With this side of the view facing upwards, the three features ABC are machined at one time, eliminating the impact of multiple clamping on machining accuracy.
[0042] The above is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.
Claims
1. A crankshaft spline rough hobbing positioning tool, comprising a gear sleeve (1), characterized in that: An eccentric hole (2) is provided at one end of the gear sleeve (1), a center hole (3) is provided at the center position of the gear sleeve (1), the center hole (3) and the eccentric hole (2) are communicated, the supporting circular sleeve of the crank shaft body (7) is arranged in the eccentric hole (2), the eccentric circular sleeve of the crank shaft body (7) is arranged in the center hole (3), and the eccentric circular sleeve of the crank shaft body (7) is fixed by a copper head screw (6).
2. The crankshaft spline rough hobbing positioning tool according to claim 1, characterized in that: The copper head screw (6) is threadedly connected to the threaded hole (5) opened on the side of the gear sleeve (1).
3. The crankshaft spline rough hobbing positioning tool according to claim 2, characterized in that: The end of the copper head screw (6) is movably provided with a rotating handle (9).
4. The crankshaft spline rough hobbing positioning tool according to claim 3, characterized in that: The copper head screw (6) is pressed against the side surface of the eccentric circle of the crank shaft body (7), so that the eccentric circle of the crank shaft body (7) is tilted to one side.
5. The crankshaft spline rough hobbing positioning tool according to claim 4, characterized in that: The copper head screw (6) has a symmetrically arranged limit slot (8) at its end, and a symmetrically arranged limit block (10) is provided inside the turning handle (9), and the limit block (10) is slidably connected to the limit slot (8).
6. The crankshaft spline rough hobbing positioning tool according to claim 1, characterized in that: The position accuracy of the central hole (3) and the eccentric hole (2) is within φ0.01mm, and the hole diameter tolerance is H6.
7. The crankshaft spline rough hobbing positioning tool according to claim 6, characterized in that: Positioning holes (4) are drilled inside the gear sleeve (1), and the positioning holes (4) are distributed in a ring shape inside the gear sleeve (1).
8. The crankshaft spline rough hobbing positioning tool according to claim 7, characterized in that: The number of the positioning holes (4) is consistent with the number of teeth on the spline of the crankshaft body (7).
9. The crankshaft spline rough hobbing positioning tool according to claim 8, characterized in that: The pitch circle of the positioning hole (4) coincides with the center hole (3), the concentricity is within φ0.02 mm, and the position accuracy of a single positioning hole (4) is within φ0.02 mm.
10. The crankshaft spline rough hobbing positioning tool according to claim 9, characterized in that: The angle between the connecting line of the positioning hole (4) closest to the eccentric circle of the crankshaft body (7) and the center hole (3) and the connecting line of the eccentric circle hole and the center hole (3) is within 1 minute.