A transmission mechanism

Abstract

A transmission mechanism relates to the machining technology of workpieces or other products with three-lobe wave-shaped cross sections, such as the machining technology of three-lobe wave-shaped raceway aviation bearings, etc., comprising a box body, a power shaft, a steering gearbox A, a steering gearbox B, a sliding transmission shaft, a guide rail mechanism, an eccentric shaft or a crankshaft, and a connecting rod; the existing pre-deformation machining, shaping machining or numerical control interpolation machining methods have problems such as the inability to guarantee the continuous smoothness of the three-lobe wave-shaped curve surface of the machined workpiece, the difficulty in realizing the regular smooth transition of the curve, the difficulty in guaranteeing the high requirements of the shape accuracy, the wave shape consistency and the service life of the workpiece, etc.; the transmission mechanism is applied to the machining of three-lobe wave-shaped workpieces, fundamentally solves the above problems, can guarantee the continuous smooth curve surface of the controllable machined workpiece, at the same time guarantees the ability to obtain higher machining accuracy, shape accuracy, surface quality and wave shape consistency, and the machining process is more simple and efficient.

Description

TECHNICAL FIELD

[0001] The present application relates to the mechanical manufacturing technology of workpieces or products with three-lobe wave cross section, such as the machining technology of three-lobe wave raceway of aviation bearing, and particularly relates to a transmission mechanism. BACKGROUND

[0002] The manufacturing methods of workpieces or products with three-lobe wave cross section include pre-deformation machining, quasi-machining or numerical control interpolation machining. The pre-deformation machining method pre-applies pressure to the workpiece to be machined to make it pre-deform, and then processes the raceway through the traditional cutting process, removes the pre-applied pressure, and the workpiece rebounds to form a three-lobe wave. The problems of this method are that it is difficult to ensure the shape and position accuracy, and the service life is reduced. The quasi-machining technology processes the required lobe shape by making the grinding tool vibrate to grind the raceway of the bearing outer ring, and quasi-forms a three-lobe wave. The problems of this method are that the radius of the grinding tool can only be smaller than the inner diameter of the workpiece, the formed wave curve is prone to have convex points, it is difficult to ensure the continuity and gradual change of the curvature of the lobe curve, it is difficult to realize the regular and smooth transition of the curve, and it is difficult to ensure the shape and position accuracy of the workpiece. The numerical control interpolation grinding machining technology processes through computer point taking or optimized point taking. The tool must complete cutting in high frequency response motion, and a step or a circular arc will be formed between two cutting points. The processed curve cannot be continuous and smooth, which determines that it is impossible to directly process a three-lobe wave curve surface, and it is difficult to ensure the surface quality. So far, there has been no positive and controllable cutting machining technology method for continuously and smoothly forming a three-lobe wave workpiece non-circular curve surface. SUMMARY

[0003] In order to solve the problems of the prior art, the present application provides a solution different from the existing three-lobe wave workpiece manufacturing technology, and realizes the direct cutting machining and forming of a three-lobe wave continuous smooth curve surface.

[0004] Scheme one:

[0005] The power is first transmitted to the steering gearbox A by the same power source, the steering gearbox A transmits the power to the steering gearbox B, and the power transmission mode is a series mode.

[0006] A transmission mechanism, comprising a box body, a power shaft, a steering gearbox A, a steering gearbox B, a sliding transmission shaft, a guide rail mechanism, an eccentric shaft or a crankshaft, a connecting rod, a workbench and a power source.

[0007] The power shafts include a first power shaft of the steering gearbox A and a second power shaft of the steering gearbox B; the steering gearbox A is fixedly installed on the box body, and a first power shaft and a first power output shaft perpendicular to each other are arranged on the steering gearbox A, and an eccentric shaft or a crankshaft is installed at the end of the first power output shaft; the steering gearbox B is installed on the guide rail mechanism, and a second power shaft and a second power output shaft perpendicular to each other are arranged on the steering gearbox B, and the guide rail mechanism is fixedly installed on the box body.

[0008] The first power shaft of the steering gearbox A is connected with the second power shaft of the steering gearbox B through a sliding transmission shaft, and power is transmitted at a constant speed.

[0009] The power source transmits power to the steering gearbox A, and the steering gearbox A transmits power to the steering gearbox B through the first power shaft, the sliding transmission shaft and the second power shaft; the steering gearbox A simultaneously transmits power to the eccentric shaft or the crankshaft through the first power output shaft.

[0010] The second power output shaft is parallel to the first power output shaft, the second power output shaft extends out of the box body, and a workbench is fixedly installed at the end of the second power output shaft; the workbench top is perpendicular to the second power output shaft, and the second power output shaft drives the workbench to make a circular motion.

[0011] One end of the connecting rod is movably connected with the eccentric shaft or the crankshaft through a bearing, and the other end is movably connected with the second power output shaft through a bearing; the eccentric shaft or the crankshaft drives the steering gearbox B and the second power output shaft to make a linear reciprocating motion on the guide rail mechanism, and further drives the workbench to make a linear reciprocating motion.

[0012] The second power output shaft drives the workbench to make a linear reciprocating motion while making a circular motion, and the two motions are superimposed to form a compound motion.

[0013] The guide rail mechanism includes a guide rail frame, linear guides, sliding blocks and connecting plates; the guide rail frame is fixedly installed with four linear guides, and the four linear guides are parallel to the second power shaft of the steering gearbox B; among them, two linear guides are fixed on the top plate of the guide rail frame and guide the second power output shaft through the sliding blocks and the connecting plates; two linear guides are fixed on the bottom plate of the guide rail frame and support and guide the steering gearbox B through the sliding blocks; the second power output shaft passes through the connecting plate perpendicularly and is connected with the connecting plate through a bearing; and the connecting plate is installed on the linear guides through the sliding blocks thereon.

[0014] The rotation speed ratio of the first power output shaft to the first power shaft is 3:1, the rotation speed ratio of the second power output shaft to the second power shaft is 1:1, the first power shaft, the sliding transmission shaft and the second power shaft transmit power at a constant speed, and the rotation speed ratio of the first power output shaft to the second power output shaft is 3:1, and the two shafts work synchronously at the rotation speed ratio of 3:1.

[0015] The eccentric shaft is driven by the first power output shaft to move eccentrically for 3 cycles, and then drives the second power output shaft to move linearly and reciprocally for 3 cycles, and the second power output shaft simultaneously moves circularly for 1 cycle.

[0016] The second power output shaft drives the workbench to move linearly and reciprocally for 3 cycles and simultaneously rotates circularly for 1 cycle, and the ratio is 3:1, and the linear reciprocating direction of the workbench is perpendicular to the axis of the circular motion of the workbench.

[0017] Preferably, the sliding transmission shaft is a spline transmission shaft.

[0018] Preferably, the eccentric distance of the eccentric shaft or the rotation radius of the connecting rod journal of the crankshaft is adjusted, such as replacing different crankshafts, adjusting the eccentric rotation radius, and then adjusting the length difference of the major and minor axes of the variable ellipse curve contained in each lobe of the three-lobe wave curve, and then adjusting and determining the shape of the three-lobe wave curve.

[0019] Scheme two:

[0020] The same power source transmits power to the power distribution box, and the power distribution box simultaneously transmits power to the two steering gearboxes, and the power transmission mode is a parallel mode.

[0021] A transmission mechanism, comprising a box body, a power shaft, a steering gearbox A, a power distribution box, a steering gearbox B, a sliding transmission shaft, a guide rail mechanism, an eccentric shaft or a crankshaft, a connecting rod, a workbench, and a power source.

[0022] The power shaft includes a first power shaft of the steering gearbox A and a second power shaft of the steering gearbox B; the steering gearbox A is fixedly installed on the box body, and a first power shaft and a first power output shaft perpendicular to each other are arranged on the steering gearbox A, and an eccentric shaft or a crankshaft is installed at the end of the first power output shaft; the steering gearbox B is installed on the guide rail mechanism, and a second power shaft and a second power output shaft perpendicular to each other are arranged on the steering gearbox B, and the guide rail mechanism is fixedly installed on the box body.

[0023] The second power output shaft is parallel to the first power output shaft, the second power output shaft extends out of the box body, and the workbench is fixedly installed at the end of the second power output shaft, the workbench is perpendicular to the second power output shaft, and the second power output shaft drives the workbench to move circularly.

[0024] The first power shaft of the steering gearbox A is connected to the second power shaft of the steering gearbox B through the sliding transmission shaft.

[0025] The power distribution box is fixedly installed on the box body and is arranged between the first power shaft of the steering gearbox A and the sliding transmission shaft.

[0026] The same power source transmits power to the power distribution box, and the power distribution box simultaneously transmits power to the steering gearbox A and the steering gearbox B; the steering gearbox A simultaneously transmits power to the eccentric shaft or the crankshaft through the first power output shaft.

[0027] One end of the connecting rod is movably connected to the eccentric shaft or the crankshaft through a bearing, and the other end is movably connected to the second power output shaft through a bearing; the eccentric shaft or the crankshaft drives the steering gearbox B and the second power output shaft to make linear reciprocating motion on the guide rail mechanism, thereby driving the workbench to make linear reciprocating motion.

[0028] The second power output shaft drives the workbench to make linear reciprocating motion while making circular motion, and the two motions are superimposed to form a compound motion.

[0029] The guide rail mechanism includes a guide rail frame, linear guides, a sliding block, and a connecting plate; the guide rail frame is fixedly installed with four linear guides, and the four linear guides are parallel to the second power shaft of the steering gearbox B; the top plate of the guide rail frame is fixed with two linear guides, and the second power output shaft is guided by the sliding block and the connecting plate; the bottom plate of the guide rail frame is fixed with two linear guides, and the steering gearbox B is supported and guided by the sliding block; the second power output shaft passes through the connecting plate vertically and is connected to the connecting plate through a bearing; and the connecting plate is installed on the linear guides through the sliding block thereon.

[0030] The rotation speed ratio of the first power output shaft to the first power shaft is 3:1, the rotation speed ratio of the second power output shaft to the second power shaft is 1:1, and the rotation speed ratio of the first power output shaft to the second power output shaft is 3:1, and the two shafts work synchronously at the rotation speed ratio of 3:1.

[0031] The eccentric shaft makes eccentric motion for 3 cycles under the driving of the first power output shaft, and then drives the second power output shaft to make linear reciprocating motion for 3 cycles through the connecting rod, and the second power output shaft makes circular motion for 1 cycle at the same time.

[0032] The second power output shaft drives the workbench to make linear reciprocating motion for 3 cycles while making circular motion for 1 cycle synchronously, and the ratio is 3:1; the linear reciprocating motion direction of the workbench is perpendicular to the axis of the circular motion of the workbench.

[0033] Preferably, the sliding transmission shaft is a spline transmission shaft.

[0034] Preferably, the eccentric distance of the eccentric shaft or the rotation radius of the connecting rod journal of the crankshaft is adjusted, such as replacing different crankshafts, adjusting the eccentric motion rotation radius, adjusting the length difference of the major and minor axes of the variable ellipse curve contained in each lobe of the three-lobe wave curve, and then adjusting and determining the shape of the three-lobe wave curve.

[0035] Scheme three:

[0036] The present application does not limit whether the power source is the same power source, does not limit the power transmission mode (series or parallel), only needs to ensure that the first power output shaft and the second power output shaft connected with the power transmission mechanism are parallel to each other, the speed ratio is 3:1, and the synchronous motion is maintained according to the speed ratio of 3:1.

[0037] A transmission mechanism, comprising a first power output shaft and a second power output shaft connected with a power transmission mechanism, an eccentric shaft or a crankshaft, a connecting rod, and a workbench.

[0038] The second power output shaft is parallel to the first power output shaft, and the axes of the two shafts form a certain plane; the workbench is fixedly installed at the end of the second power output shaft, the workbench top is perpendicular to the second power output shaft, and the second power output shaft drives the workbench to make a circular motion.

[0039] The eccentric shaft or the crankshaft is installed at the end of the first power output shaft, one end of the connecting rod is movably connected with the eccentric shaft or the crankshaft through a bearing, and the other end is movably connected with the second power output shaft through a bearing, and the eccentric shaft or the crankshaft drives the second power output shaft to make a linear reciprocating motion in the certain plane.

[0040] The second power output shaft drives the workbench to make a linear reciprocating motion while making a circular motion, and the two motions are superimposed to form a compound motion.

[0041] The speed ratio of the first power output shaft and the second power output shaft is 3:1, and the synchronous work is maintained according to the speed ratio of 3:1; the eccentric shaft makes eccentric motion for 3 turns under the driving of the first power output shaft, and then drives the second power output shaft to make linear reciprocating motion for 3 times back and forth in the certain plane through the connecting rod, and the second power output shaft makes circular motion for 1 turn at the same time.

[0042] The second power output shaft drives the workbench to make linear reciprocating motion for 3 times back and forth while making circular motion for 1 turn synchronously, the ratio is 3:1, and the linear reciprocating motion direction of the workbench is perpendicular to the axis of the circular motion of the workbench.

[0043] As a preferred, the eccentric distance of the eccentric shaft or the rotation radius of the connecting rod journal of the crankshaft is adjusted, such as replacing different crankshafts, adjusting the eccentric motion rotation radius, and then adjusting the length difference of the major axis and the minor axis of the variable ellipse curve contained in each petal of the three-petal wave curve, and then adjusting the shape of the three-petal wave curve.

[0044] The present application brings the following beneficial effects:

[0045] In the field of mechanical manufacturing, the processing of non-circular curve surface is difficult but very important. The western manufacturing power invented numerical control interpolation technology and developed it into a widely used technology. However, the processing principle determines that there are problems that cannot be solved. The tool must complete the cutting processing in high frequency reciprocating motion, and the two cutting points will form a step or a circular arc, and the processed curve cannot be continuous and smooth. Even if the physical limit is reached, this problem always exists. In the processing of three-lobe waveform curve surface, especially in the processing and manufacturing of three-lobe waveform bearing of aero-engine, as a key core technology of national defense and military industry, the manufacturing power strictly keeps it secret, and there is no ideal solution in China so far. The present application is based on the three-lobe waveform curve passing through the fixed point motion law discovered by the first inventor, and according to the newly discovered motion principle, the generation method of three-lobe waveform curve trajectory is established by the present application. The generated three-lobe waveform curve always passes through a certain point in continuous motion, and each point on the three-lobe waveform curve can pass through the fixed point in turn and continuously, and the cutting motion relationship between the workpiece and the tool is established at the fixed point position, so that the positive active controllable continuous cutting processing of the three-lobe waveform curve is realized, and the three-lobe waveform continuous smooth curve is directly formed.

[0046] The new technical principle on which the present application is based is obviously superior to the numerical control interpolation principle, and the technical route is also completely different. It is a unique and basic manufacturing technology independently created by China, which can effectively solve the processing and manufacturing problems of three-lobe waveform workpieces or products, especially providing an effective technical solution for greatly improving the reliability and life of military aero-engine bearings and narrowing the gap with western powers.

[0047] The present application fundamentally eliminates various problems existing in the processing method of the existing three-lobe waveform curve surface. The existing pre-deformation processing, shaping processing or numerical control interpolation processing and other technical methods have problems which have been pointed out in the background art. The present application realizes the positive active controllable processing and forming of three-lobe waveform curve by establishing the composite cutting motion relationship between the workpiece and the tool. The generation of three-lobe waveform curve is independently completed by the composite motion of the workpiece, and the tool does not participate in the generation motion of the curve trajectory. Only the cutting processing of the workpiece surface is needed. Therefore, the most mature continuous cutting process can be applied to the processing of three-lobe waveform curve surface proposed by the present application, which fundamentally ensures the ability to obtain higher processing precision, shape and position precision, surface quality and waveform consistency, ensures the continuous smoothness and precision of the three-lobe waveform curve surface of the workpiece, and the processing process is more simple and efficient. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0049] Figure 1 is a structural schematic diagram of the embodiment one of the present application; Figure 1

[0050] Figure 2 is a partial sectional view of the embodiment one of the present application; Figure 2 Figure 1 Figure 3 is a sectional view of the embodiment one of the present application;

[0051] Figure 4 is a structural schematic diagram of the guide rail mechanism contained in the embodiment one of the present application; Figure 3 Figure 1 Figure 5 is a top view of the embodiment one of the present application;

[0052] Figure 6 is a left view of the embodiment one of the present application; Figure 4 Figure 1 Figure 7 is a top view of the embodiment two of the present application;

[0053] Figure 8 is a left view of the embodiment two of the present application; Figure 5 Figure 1 Figure 9 is a top view of the embodiment three of the present application;

[0054] Figure 10 is a left view of the embodiment three of the present application; Figure 6 Figure 11 is a top view of the workpiece sectional three-lobe wave curve processing of the embodiment one of the present application;

[0055] Figure 7 Figure 12 is a structural schematic diagram of the crankshaft in the embodiment one of the present application;

[0056] Figure 13 is a structural schematic diagram of the embodiment two of the present application; Figure 8 Figure 14 is a partial sectional view of the embodiment two of the present application;

[0057] Figure 9 Figure 15 is a structural schematic diagram of the embodiment three of the present application. Figure 8 Figure 16 is a sectional view of the embodiment three of the present application.

[0058] Figure 10 Figure 17 is a sectional view of the embodiment three of the present application.

[0059] Figure 18 is a sectional view of the embodiment three of the present application.

[0060] 1 box body;

[0061] 21 first power shaft; 22 second power shaft;

[0062] 3 steering gearbox A; 31 first power output shaft;

[0063] 4 spline transmission shaft;

[0064] 5 steering gearbox B; 51 second power output shaft;

[0065] ​​​​​​​​6. Guide rail frame; 61. Linear guide rail; 62. Linear guide rail; 63. Linear guide rail; 64. Linear guide rail; 65. Slider; 66. Slider; 67. Slider; 68. Slider; 69. Connecting plate;

[0066] 7 Eccentric shaft; 8 Connecting rod; 9 Worktable; 10 Tool; 11 Workpiece; 12 Fixture; 13 Crankshaft; 14 Power distribution box; 15 Power source; 16 Power transmission mechanism. Detailed Implementation

[0067] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0068] Example 1:

[0069] As attached Figure 1 Appendix Figure 3 As shown, and see appendix. Figure 2 Appendix Figure 4 Appendix Figure 5 Appendix Figure 7 This invention provides a transmission mechanism, including a housing 1, a first power shaft 21, a second power shaft 22, a steering gearbox A3, a first power output shaft 31, a spline drive shaft 4, a steering gearbox B5, a second power output shaft 51, a guide frame 6, linear guides 61, 62, 63, and 64, sliders 65, 66, 67, and 68, a connecting plate 69, an eccentric shaft 7, a connecting rod 8, a worktable 9, a cutting tool 10, a workpiece 11, a fixture 12, a crankshaft 13, and a power source 15.

[0070] Steering gearbox A3 is fixedly mounted on housing 1, on which a first power shaft 21 and a first power output shaft 31 are arranged perpendicularly to each other, and an eccentric shaft 7 or a crankshaft 13 is installed at the end of the first power output shaft 31; steering gearbox B5 is mounted on guide rail frame 6, on which a second power shaft 22 and a second power output shaft 51 are arranged perpendicularly to each other, and guide rail frame 6 is fixedly mounted on housing 1.

[0071] The first power shaft 21 of the steering gearbox A3 is connected to the second power shaft 22 of the steering gearbox B5 via the spline drive shaft 4, transmitting power at a constant speed.

[0072] Power source 15 transmits power to steering gearbox A3, which in turn transmits power to steering gearbox B5 via first power shaft 21, spline drive shaft 4, and second power shaft 22. Steering gearbox A3 also transmits power to eccentric shaft 7 or crankshaft 13 via first power output shaft 31.

[0073] The second power output shaft 51 is parallel to the first power output shaft 31, and the second power output shaft 51 extends out of the box body and is fixedly installed with the workbench 9 at the end. The workbench 9 table is perpendicular to the second power output shaft 51, and the second power output shaft 51 drives the workbench 9 to make a circular motion.

[0074] One end of the connecting rod 8 is movably connected with the eccentric shaft 7 or the crankshaft 13 through a bearing, and the other end is movably connected with the second power output shaft 51 through a bearing. The eccentric shaft 7 or the crankshaft 13 drives the steering gearbox B5 and the second power output shaft 51 to make a linear reciprocating motion on the guide rail frame 6, thereby driving the workbench 9 to make a linear reciprocating motion.

[0075] The second power output shaft 51 drives the workbench 9 to make a linear reciprocating motion while making a circular motion, and the two motions are superimposed to form a compound motion. The guide rail frame 6 is fixedly installed with four linear guides 61, 62, 63 and 64, which are parallel to the second power shaft 22 of the steering gearbox B5. Among them, the top plate of the guide rail frame 6 is fixed with two linear guides 63 and 64, which guide the second power output shaft 51 through four sliding blocks 65, 66, 67 and 68 and a connecting plate 69. The bottom plate of the guide rail frame 6 is fixed with two linear guides 61 and 62, which support and guide the steering gearbox B5 through sliding blocks. The second power output shaft 51 passes through the connecting plate 69 vertically and is connected with the connecting plate 69 through a bearing. The connecting plate 69 is installed on the linear guides 63 and 64 through the sliding blocks 65, 66, 67 and 68 thereon.

[0076] The rotation speed ratio of the first power output shaft 31 to the first power shaft 21 is 3:1, and the rotation speed ratio of the second power output shaft 51 to the second power shaft 22 is 1:1. The first power shaft 21, the spline transmission shaft 4 and the second power shaft 22 transmit power at the same speed. The rotation speed ratio of the first power output shaft 31 to the second power output shaft 51 is 3:1, and they work synchronously at the ratio of 3:1.

[0077] At the same time, the eccentric shaft 7 makes eccentric motion for 3 turns under the drive of the first power output shaft 31, and then drives the second power output shaft 51 to make linear reciprocating motion for 3 times through the connecting rod 8. The second power output shaft 51 makes circular motion for 1 turn at the same time.

[0078] The second power output shaft 51 drives the workbench 9 to make linear reciprocating motion for 3 times while making circular motion for 1 turn synchronously, and the ratio is 3:1. The linear reciprocating motion direction of the workbench 9 is perpendicular to the axis of the circular motion of the workbench 9.

[0079] As a preferred embodiment, the eccentric distance of the eccentric shaft 7 or the rotation radius of the connecting rod shaft of the crankshaft 13 is adjusted, such as replacing different crankshafts 13 to adjust the rotation radius of eccentric motion, and then adjusting the length difference of the major and minor axes of the variable ellipse curve contained in each lobe of the three-lobe wave curve, and then adjusting and determining the shape of the three-lobe wave curve.

[0080] Further explanation:

[0081] As attached Figure 6 As shown, and see appendix. Figure 1 A top-view diagram illustrating the machining of the three-lobed waveform curve of workpiece 11's cross-section, showing the machining process and result. Tool 10 is fixed in position. Figure 6 The upper, middle, and lower diagrams illustrate the correspondence between the movement positions of the eccentric shaft 7, the workpiece 11, and the center position of the workpiece 11. The first power output shaft 31 drives the eccentric shaft 7 to rotate, which in turn pushes and pulls the second power output shaft 51, the worktable 9, and the workpiece 11 in linear reciprocating motion via the connecting rod 8. Simultaneously, the second power output shaft 51 synchronously rotates in a circular motion, driving the worktable 9 and the workpiece 11 to perform circular motion. (As shown...) Figure 6 The above figure shows the starting position of the eccentric shaft 7; the workpiece 11 moves towards the tool 10 during its circular motion, and the thickness being cut gradually increases, as shown in the figure. Figure 6 As shown in the diagram, when the first power output shaft 31 drives the eccentric shaft 7 to rotate 180 degrees, the second power output shaft 51, the worktable 9, and the workpiece 11 rotate 60 degrees, simultaneously moving a maximum distance towards the tool 10. At this position, the workpiece 11 has the greatest thickness removed. As the first power output shaft 31 continues to drive the eccentric shaft 7 to rotate, the workpiece 11 moves away from the tool 10, and the thickness removed from the workpiece gradually decreases. Figure 6 As shown in the figure below, the eccentric shaft 7 rotates 180 degrees, completing a full 360-degree rotation, and returns to the starting position. At the same time, the workpiece 11 rotates 120 degrees, minimizing the cutting thickness, thus completing the cutting of the first lobe of the three-lobed waveform curve, which is a variable elliptical curve. In sequence, the eccentric shaft completes a second 360-degree rotation, and the workpiece continues to rotate 120 degrees, completing the cutting of the second lobe. In sequence, the eccentric shaft completes a third 360-degree rotation, and the workpiece continues to rotate 120 degrees, accumulating a full 360-degree rotation, thus completing the cutting of the third lobe, and finally completing the machining of the entire three-lobed waveform cross-section curve.

[0082] To elaborate further:

[0083] As attached Figure 1 Appendix Figure 4As shown, the fixture 12 clamps the workpiece 11 to be machined to be fixed at the center of the worktable 9, the center axis of the workpiece 11 is coaxial with the second power output shaft 51, the power input transmission mechanism, the worktable 9 and the workpiece 11 start to move, the movement form is a composite movement formed by superimposing the circular movement and the linear reciprocating movement, the linear reciprocating movement is back and forth for 3 times while the circular movement rotates for 1 revolution. The second power output shaft 51 drives the workpiece 11 to move linearly, the straight line formed by the linear reciprocating movement of the point on the center axis of the workpiece 11 is the tool feeding straight line of the cross-sectional curve of the workpiece to be machined; the second power output shaft 51 drives the workpiece 11 to move linearly, the plane formed by the linear reciprocating movement of the center axis of the workpiece 11 is the tool moving plane of the curved surface of the workpiece to be machined. In the cutting movement, the generation of the three-lobe waveform curve is independently completed by the composite movement of the workpiece 11, the tool 10 does not participate in the generation movement of the three-lobe waveform curve and only needs to complete the surface cutting. The tool 10 is further driven to feed along the tool feeding straight line to stop feeding at the required position, and the workpiece 11 is continuously machined in the continuous composite movement; each point on the cross section of the workpiece 11 will repeatedly return to the cutting position in the composite movement cycle, and the continuous and smooth three-lobe waveform curve of the cross section of the workpiece 11 is accurately machined and formed. The tool 10 moves on the tool moving plane to complete the cutting of other cross-sectional curves until the machining and forming of the three-lobe waveform surface of the workpiece 11 are completed.

[0084] Embodiment two:

[0085] As shown in the accompanying drawings Figure 8 , the accompanying drawings Figure 3 , and referring to the accompanying drawings Figure 4 , the accompanying drawings Figure 5 , the accompanying drawings Figure 7 , the accompanying drawings Figure 9 , the embodiment of the present application provides a transmission mechanism, which comprises a box body 1, a first power shaft 21, a second power shaft 22, a steering gearbox A 3, a first power output shaft 31, a spline transmission shaft 4, a steering gearbox B 5, a second power output shaft 51, a guide rail frame 6, a linear guide rail 61, a linear guide rail 62, a linear guide rail 63, a linear guide rail 64, a sliding block 65, a sliding block 66, a sliding block 67, a sliding block 68, a connecting plate 69, an eccentric shaft 7, a connecting rod 8, a worktable 9, a tool 10, a workpiece 11, a fixture 12, a crankshaft 13, a power distribution box 14 and a power source 15.

[0086] Based on Embodiment 1, the difference between this embodiment and Embodiment 1 is as follows: In Embodiment 1, the power source is connected to the steering gearbox A3, and power is first transmitted to the steering gearbox A3, and then to the steering gearbox B5 via the spline drive shaft 4, with a series power transmission method; in this embodiment, a power distribution box 14 is connected between the first power shaft 21 of the steering gearbox A3 and the spline drive shaft 4. The power distribution box 14 transmits power through the first power shaft 21 shared with the steering gearbox A3. The power distribution box 14 is connected to the power source 15, and power is simultaneously transmitted to both the steering gearbox A3 and the steering gearbox B5 through the power distribution box 14, with a parallel power transmission method. Other methods are the same as in Embodiment 1, and will not be repeated here.

[0087] As attached Figure 6 Appendix Figure 8 As shown, and see appendix. Figure 4 The following is a top view diagram of the machining of the three-lobed waveform curve of workpiece 11 section, and a further explanation of the machining process. The content is the same as in Example 1, and will not be repeated here.

[0088] Example 3:

[0089] Based on Embodiments 1 and 2 of the present invention, this embodiment does not limit whether the power source is the same power source or the power transmission method (series or parallel). It only needs to ensure that the first power output shaft 31 and the second power output shaft 51 connected to the power transmission mechanism are parallel to each other, have a speed ratio of 3:1, and maintain synchronous movement according to the speed ratio of 3:1.

[0090] As attached Figure 10 As shown, and see appendix. Figure 7 The present invention further provides a transmission mechanism, including a first power output shaft 31, a second power output shaft 51, an eccentric shaft 7, a connecting rod 8, a worktable 9, a cutting tool 10, a workpiece 11, a fixture 12, a crankshaft 13, and a power transmission mechanism 16.

[0091] The power transmission mechanism 16 is provided with a first power output shaft 31 and a second power output shaft 51. The second power output shaft 51 is parallel to the first power output shaft 31. The two shafts remain parallel in both static and dynamic states. The axes of the two shafts form a defined plane. The speed ratio of the first power output shaft 31 to the second power output shaft 51 is 3:1, and they maintain synchronous movement according to the speed ratio of 3:1.

[0092] An eccentric shaft 7 or a crankshaft 13 is installed at the end of the first power output shaft 31, and a worktable 9 is fixedly installed at the end of the second power output shaft 51. The surface of the worktable 9 is perpendicular to the second power output shaft 51, and the second power output shaft 51 drives the worktable to perform circular motion. One end of the connecting rod 8 is movably connected to the eccentric shaft 7 through a bearing set on the eccentric shaft 7 or the crankshaft 13, and the other end is movably connected to the second power output shaft 51 through a bearing set on the second power output shaft 51. The eccentric shaft 7 or the crankshaft 13 drives the second power output shaft 51 to perform linear reciprocating motion in the defined plane, which in turn drives the worktable 9 to perform linear reciprocating motion. The second power output shaft 51 drives the worktable 9 to perform circular motion while simultaneously performing linear reciprocating motion, which superimposes to form a compound motion. The speed ratio between the first power output shaft 31 and the second power output shaft 51 is 3:1, and they work synchronously according to the 3:1 speed ratio. The eccentric shaft 7 moves eccentrically 3 times under the drive of the first power output shaft 31, and then drives the second power output shaft 51 to reciprocate linearly 3 times through the connecting rod 8. The second power output shaft 51 synchronously rotates 1 time in a circle. The second power output shaft 51 drives the worktable 9 to reciprocate linearly 3 times and rotate synchronously 1 time in a circle. The ratio of their speed ratios is 3:1. The direction of the linear reciprocating motion of the worktable is perpendicular to the axis of the circular motion of the worktable 9.

[0093] Preferably, by adjusting the eccentric distance of the eccentric shaft 7 or the radius of rotation of the crankshaft 13, such as by replacing the crankshaft 13 with a different one, the radius of rotation of the eccentric motion is adjusted and changed, thereby adjusting the length difference between the major and minor axes of the variable elliptical curve contained in each lobe of the three-lobed waveform curve, and thus adjusting and determining the shape of the three-lobed waveform curve.

[0094] Further explanation of the top view diagram illustrating the machining of the three-lobed waveform curve at section 11 of the workpiece, and a more detailed description of the machining process, is attached. Figure 6 Appendix Figure 10 As shown, see appendix Figure 4 The content is the same as in Example 1, and will not be repeated here.

[0095] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to the 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 application. Therefore, the scope of protection of this application is not limited to the embodiments shown herein, but rather conforms to the widest scope consistent with the principles and novel features disclosed herein. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A transmission mechanism comprising a box, a power shaft, a steering gearbox A, a steering gearbox B, a sliding transmission shaft, a guide rail mechanism, an eccentric shaft or a crankshaft, a connecting rod, characterized in that: the power shaft comprises a first power shaft of the steering gearbox A and a second power shaft of the steering gearbox B; the steering gearbox A is fixedly installed on the box and is provided with the first power shaft and a first power output shaft perpendicular to each other, and the first power output shaft is provided at the end with the eccentric shaft or the crankshaft; the steering gearbox B is installed on the guide rail mechanism and is provided with the second power shaft and a second power output shaft perpendicular to each other, and the guide rail mechanism is fixedly installed on the box; the second power output shaft is parallel to the first power output shaft, and the second power output shaft extends out of the box; the first power shaft of the steering gearbox A is connected with the second power shaft of the steering gearbox B through the sliding transmission shaft; the connecting rod is movably connected at one end with the eccentric shaft or the crankshaft and at the other end with the second power output shaft, and the eccentric shaft or the crankshaft drives the steering gearbox B and the second power output shaft to do linear reciprocating motion on the guide rail mechanism; the rotation speed ratio of the first power output shaft to the second power output shaft is 3:1, and the rotation speed ratio is kept synchronous.

2. The transmission mechanism of claim 1, wherein the guide rail mechanism comprises a guide rail frame, linear guides, sliding blocks, and a connecting plate, the guide rail frame is fixedly installed with four linear guides, and the four linear guides are parallel to the second power shaft of the steering gearbox B, wherein the top plate of the guide rail frame is fixed with two linear guides, the second power output shaft is guided through the sliding blocks and the connecting plate, the bottom plate of the guide rail frame is fixed with two linear guides, the steering gearbox B is supported and guided through the sliding blocks, the second power output shaft passes through the connecting plate perpendicularly, the connecting plate is connected with the connecting plate through bearings, and the connecting plate is installed on the linear guides through the sliding blocks thereon.

3. The transmission mechanism of claim 1, wherein the eccentric motion radius is changed by adjusting the eccentric distance of the eccentric shaft or the rotation radius of the crankshaft.

4. The transmission mechanism of claim 1, wherein the sliding transmission shaft is a spline transmission shaft.

5. A transmission mechanism comprising a box, a power shaft, a steering gearbox A, a power distribution box, a steering gearbox B, a sliding transmission shaft, a guide rail mechanism, an eccentric shaft or a crankshaft, and a connecting rod, characterized in that: the power shaft comprises a first power shaft of the steering gearbox A and a second power shaft of the steering gearbox B; the steering gearbox A is fixedly installed on the box and is provided with the first power shaft and a first power output shaft perpendicular to each other, and the first power output shaft is provided at the end with the eccentric shaft or the crankshaft; the steering gearbox B is installed on the guide rail mechanism and is provided with the second power shaft and a second power output shaft perpendicular to each other, and the guide rail mechanism is fixedly installed on the box; the second power output shaft is parallel to the first power output shaft, and the second power output shaft extends out of the box; the first power shaft is connected with the second power shaft of the steering gearbox B through the sliding transmission shaft; the power distribution box is fixedly installed on the box and is arranged between the first power shaft of the steering gearbox A and the sliding transmission shaft, and simultaneously transmits power to the steering gearbox A and the steering gearbox B; the connecting rod is movably connected at one end with the eccentric shaft or the crankshaft and at the other end with the second power output shaft, and the eccentric shaft or the crankshaft drives the steering gearbox B and the second power output shaft to do linear reciprocating motion on the guide rail mechanism. The rotation speed ratio of the first power output shaft and the second power output shaft is 3:1, and they are kept synchronous.

6. The transmission mechanism of claim 5, wherein The guide rail mechanism comprises a guide rail frame, linear guides, sliders, connecting plates, the guide rail frame is fixedly provided with four linear guides, the four linear guides are parallel to the second power shaft of the steering gearbox B, among them, the guide rail frame top plate is fixed with two linear guides, the second output shaft is guided by the sliders and the connecting plates, the guide rail frame bottom plate is fixed with two linear guides, the steering gearbox B is supported and guided by the sliders, the second power output shaft vertically passes through the connecting plate, is connected with the connecting plate through bearings, and the connecting plate is installed on the linear guides through the sliders thereon.

7. The transmission mechanism of claim 5, wherein The eccentric motion radius is changed by adjusting the eccentric distance of the eccentric shaft or the rotation radius of the crankshaft.

8. The transmission mechanism of claim 5, wherein The sliding transmission shaft is a spline transmission shaft.

9. A transmission mechanism comprising a first power output shaft and a second power output shaft connected with a power transmission mechanism, an eccentric shaft or a crankshaft, and a connecting rod, characterized in that: The second power output shaft is parallel to the first power output shaft, and the axes of the two shafts form a certain plane, The first power output shaft is provided at the end with an eccentric shaft or a crankshaft, One end of the connecting rod is movably connected with the eccentric shaft or the crankshaft, and the other end is movably connected with the second power output shaft, the eccentric shaft or the crankshaft drives the second power output shaft to make linear reciprocating motion on the certain plane, The rotation speed ratio of the first power output shaft and the second power output shaft is 3:1, and they are kept synchronous.

10. The power transmission mechanism of claim 9, wherein, The eccentric motion radius is changed by adjusting the eccentric distance of the eccentric shaft or the rotation radius of the crankshaft.

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