A transmission mechanism

Abstract

A transmission mechanism relates to the mechanical manufacturing technology of machining molds, workpieces or other products with four-lobe waveforms and more than four-lobe waveforms, 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. Existing numerical control interpolation machining or profiling machining methods cannot guarantee the continuous smoothness of the four-lobe waveform and more than four-lobe waveform curves of the machined workpiece, and it is difficult to guarantee the shape accuracy, surface quality and waveform consistency of the workpiece. The transmission mechanism is applied to the machining of four-lobe waveform and more than four-lobe waveform workpieces, fundamentally solves the above problems, can guarantee the continuous smoothness and accuracy of the curve surface of the formed workpiece in the controllable cutting process, and can guarantee higher machining accuracy, shape accuracy, surface quality and waveform consistency, and the machining process is more simple and efficient.

Description

Technical Field

[0001] This invention relates to mechanical manufacturing technology for molds, workpieces or other products with a cross-section of four or more lobes, such as the processing and manufacturing of various four-lobe waveform molds, and particularly to a transmission mechanism. Background Technology

[0002] The manufacturing of molds, workpieces, or other products with four or more lobed waveforms typically employs CNC interpolation technology or contour copying. CNC interpolation technology uses computer-aided point selection or optimized point selection, requiring the cutting tool to complete the cutting in a high-frequency response motion. This inevitably results in a step or arc between two cutting points, making it impossible for the machined curve to be continuous and smooth, and surface quality difficult to guarantee. Contour copying also struggles to guarantee machining accuracy, geometrical accuracy, and surface quality. A machining technique for continuously and smoothly forming non-circular curved surfaces of molds with four or more lobed waveforms has yet to be found. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a solution that differs from existing manufacturing technologies for four-lobed and more-lobed waveforms, enabling continuous and smooth curved surface cutting and forming of four-lobed and more-lobed waveforms.

[0004] Option 1:

[0005] The same power source first transmits power to steering gearbox A, and steering gearbox A then transmits power to steering gearbox B. The power transmission method is a series transmission.

[0006] A transmission mechanism includes a housing, a drive shaft, a steering gearbox A, a steering gearbox B, a sliding drive shaft, a guide rail mechanism, an eccentric shaft or crankshaft, a connecting rod, a worktable, and a power source.

[0007] The power shaft includes a first power shaft of steering gearbox A and a second power shaft of steering gearbox B; steering gearbox A is fixedly mounted on the housing, on which a first power shaft and a first power output shaft are arranged perpendicularly to each other, and an eccentric shaft or crankshaft is installed at the end of the first power output shaft; steering gearbox B is mounted on a guide rail mechanism, on which a second power shaft and a second power output shaft are arranged perpendicularly to each other, and the guide rail mechanism is fixedly mounted on the housing.

[0008] The first power shaft of steering gearbox A is connected to the second power shaft of steering gearbox B via a sliding transmission shaft, transmitting power at a constant speed.

[0009] The power source transmits power to the steering gearbox A, which in turn transmits power to the steering gearbox B via the first power shaft, the sliding transmission shaft, and the second power shaft. At the same time, the steering gearbox A transmits power to the eccentric shaft or the crankshaft via 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 housing and a worktable is fixedly installed at its end. The worktable surface is perpendicular to the second power output shaft, and the second power output shaft drives the worktable to make a circular motion.

[0011] One end of the connecting rod is movably connected to the eccentric shaft or crankshaft via a bearing, and the other end is movably connected to the second power output shaft via a bearing. The eccentric shaft or crankshaft drives the steering gearbox B and the second power output shaft to perform linear reciprocating motion on the guide rail mechanism, thereby driving the worktable to perform linear reciprocating motion.

[0012] The second power output shaft drives the worktable to perform linear reciprocating motion while simultaneously performing circular motion, resulting in a composite motion.

[0013] The guide rail mechanism includes a guide rail frame, linear guide rails, sliders, and connecting plates. The guide rail frame is fixedly equipped with four linear guide rails, which are parallel to the second power shaft of the steering gearbox B. Two linear guide rails are fixed to the top plate of the guide rail frame, and the second power output shaft is guided by the sliders and connecting plates. Two linear guide rails are fixed to the bottom plate of the guide rail frame, and the steering gearbox B is supported and guided by the sliders. The second power output shaft passes vertically through the connecting plate and is connected to the connecting plate by bearings. The connecting plate is mounted on the linear guide rails by the sliders on it.

[0014] The speed ratio between the first power output shaft and the first power shaft is n:1 (n is an integer divisible by 360, greater than or equal to 4 and less than or equal to 180), and the speed ratio between the second power output shaft and the second power shaft is 1:1. The first power shaft, the sliding transmission shaft, and the second power shaft transmit power at the same speed. The speed ratio between the first power output shaft and the second power output shaft is n:1 (n is an integer divisible by 360, greater than or equal to 4 and less than or equal to 180), and they work synchronously according to the speed ratio of n:1.

[0015] The eccentric shaft moves eccentrically n times under the drive of the first power output shaft, and then drives the second power output shaft to reciprocate linearly n times through the connecting rod. At the same time, the second power output shaft moves in a circular motion 1 time.

[0016] The second power output shaft drives the worktable to reciprocate linearly n times while simultaneously rotating it in a circular motion once. The ratio of the two motions is n:1. The direction of the linear reciprocating motion of the worktable is perpendicular to the axis of the circular motion of the worktable.

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

[0018] Preferably, by adjusting the eccentric distance of the eccentric shaft or the rotation radius of the connecting rod journal of the crankshaft, such as by replacing a different crankshaft, the rotation radius of the eccentric motion is adjusted, thereby adjusting the length difference between the major and minor axes of the variable elliptical curves contained in each petal of the four-petal waveform and the waveform curves with more than four petals, and thus adjusting and determining the shape of the four-petal waveform and the waveform curves with more than four petals.

[0019] Option 2:

[0020] The same power source transmits power to the power distribution box, which then transmits power to both steering gearboxes simultaneously, in a parallel power transmission mode.

[0021] A transmission mechanism includes a housing, a drive shaft, a steering gearbox A, a power distribution box, a steering gearbox B, a sliding drive shaft, a guide rail mechanism, an eccentric shaft or crankshaft, a connecting rod, a worktable, and a power source.

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

[0023] The second power output shaft is parallel to the first power output shaft. The second power output shaft extends out of the housing and a worktable is fixedly installed at its end. The worktable surface is perpendicular to the second power output shaft, and the second power output shaft drives the worktable to make a circular motion.

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

[0025] The power distribution box is fixedly installed on the housing and is located between the first power shaft and the sliding transmission shaft of the steering gearbox A;

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

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

[0028] The second power output shaft drives the worktable to perform linear reciprocating motion while simultaneously performing circular motion, resulting in a composite motion.

[0029] The guide rail mechanism includes a guide rail frame, linear guide rails, sliders, and connecting plates. The guide rail frame is fixedly equipped with four linear guide rails, which are parallel to the second power shaft of the steering gearbox B. Two linear guide rails are fixed to the top plate of the guide rail frame, and the second power output shaft is guided by the sliders and connecting plates. Two linear guide rails are fixed to the bottom plate of the guide rail frame, and the steering gearbox B is supported and guided by the sliders. The second power output shaft passes vertically through the connecting plate and is connected to the connecting plate by bearings. The connecting plate is mounted on the linear guide rails by the sliders on it.

[0030] The speed ratio between the first power output shaft and the first power shaft is n:1 (n is an integer divisible by 360, greater than or equal to 4 and less than or equal to 180), and the speed ratio between the second power output shaft and the second power shaft is 1:1. The first power shaft, the sliding transmission shaft, and the second power shaft transmit power at the same speed. The speed ratio between the first power output shaft and the second power output shaft is n:1 (n is an integer divisible by 360, greater than or equal to 4 and less than or equal to 180), and they work synchronously according to the speed ratio of n:1.

[0031] The eccentric shaft moves eccentrically n times under the drive of the first power output shaft, and then drives the second power output shaft to reciprocate linearly n times through the connecting rod. At the same time, the second power output shaft moves in a circular motion 1 time.

[0032] The second power output shaft drives the worktable to reciprocate linearly n times while simultaneously rotating it in a circular motion once. The ratio of the two motions is n:1. The direction of the linear reciprocating motion of the worktable is perpendicular to the axis of the circular motion of the worktable.

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

[0034] Preferably, by adjusting the eccentric distance of the eccentric shaft or the rotation radius of the connecting rod journal of the crankshaft, such as by replacing a different crankshaft, the rotation radius of the eccentric motion is adjusted, thereby adjusting the length difference between the major and minor axes of the variable elliptical curves contained in each petal of the four-petal waveform and the waveform curves with more than four petals, and thus adjusting and determining the shape of the four-petal waveform and the waveform curves with more than four petals.

[0035] Option 3:

[0036] This invention does not limit whether the power source is the same or not, nor does it limit the power transmission method (series or parallel). It only requires that the first and second power output shafts connected to the power transmission mechanism are parallel to each other, have a speed ratio of n:1 (n is an integer divisible by 360, greater than or equal to 4, and less than or equal to 180), and maintain synchronous motion according to the n:1 speed ratio. A transmission mechanism includes a first and second power output shaft connected to the power transmission mechanism, an eccentric shaft or crankshaft, a connecting rod, and a worktable.

[0037] The second power output shaft is parallel to the first power output shaft, and the axes of the two shafts form a defined plane;

[0038] A worktable is fixedly installed at the end of the second power output shaft. The worktable surface is perpendicular to the second power output shaft, and the second power output shaft drives the worktable to make circular motion.

[0039] An eccentric shaft or crankshaft is installed at the end of the first power output shaft.

[0040] One end of the connecting rod is movably connected to an eccentric shaft or crankshaft, and the other end is movably connected to a second power output shaft. The eccentric shaft or crankshaft drives the second power output shaft to perform linear reciprocating motion in the defined plane.

[0041] The second power output shaft drives the worktable to perform linear reciprocating motion while simultaneously performing circular motion, resulting in a composite motion.

[0042] The speed ratio between the first power output shaft and the second power output shaft is n:1 (n is an integer divisible by 360, greater than or equal to 4 and less than or equal to 180), and they work synchronously according to the speed ratio of n:1. The eccentric shaft moves eccentrically n revolutions under the drive of the first power output shaft, and then drives the second power output shaft to reciprocate n times in a straight line on the defined plane through the connecting rod. At the same time, the second power output shaft moves in a circular motion once.

[0043] The second power output shaft drives the worktable to reciprocate linearly n times while simultaneously rotating it in a circular motion once. The ratio of the two motions is n:1. The direction of the linear reciprocating motion of the worktable is perpendicular to the axis of the circular motion of the worktable.

[0044] Preferably, by adjusting the eccentric distance of the eccentric shaft or the rotation radius of the connecting rod journal of the crankshaft, such as by replacing a different crankshaft, the rotation radius of the eccentric motion is adjusted, thereby adjusting the length difference between the major and minor axes of the variable elliptical curves contained in each petal of the four-petal waveform and the waveform curves with more than four petals, and thus adjusting and determining the shape of the four-petal waveform and the waveform curves with more than four petals.

[0045] The beneficial effects of this invention are:

[0046] In the field of mechanical manufacturing, machining non-circular curves and surfaces is both difficult and crucial. Western manufacturing powerhouses invented CNC interpolation technology, which has become a widely used technique. However, its machining principle inherently presents inherent problems. The cutting tool must complete the cutting process in a high-frequency reciprocating motion, inevitably creating steps or arcs between the two cutting points. The machined curves cannot be continuously smooth, and this problem persists even with the best physical capabilities. For machining four-lobed or more-lobed curves and surfaces, CNC interpolation remains a widely used technique. This invention is based on the motion law of four-lobed and more-lobed waveforms passing through fixed points discovered by the first inventor. According to the newly discovered motion principle, this invention establishes a method for generating the trajectory of four-lobed and more-lobed waveforms. The generated four-lobed and more-lobed waveforms always pass through a certain point during continuous motion. Each point on the four-lobed and more-lobed waveforms can sequentially and continuously pass through the fixed point, repeating cyclically. At the fixed point, the cutting motion relationship between the workpiece and the tool is established, realizing positive active controllable continuous cutting machining of four-lobed and more-lobed waveforms, forming continuous and smooth four-lobed and more-lobed waveforms.

[0047] The new technical principle upon which this invention is based is significantly superior to the CNC interpolation principle, and the technical route is also completely different. It is a unique and fundamental manufacturing technology independently created in my country, which can effectively solve the processing and manufacturing problems of workpieces or products with four or more lobes.

[0048] This invention fundamentally eliminates various problems existing in current methods for machining four-lobed waveforms and curves with more than four lobes. The problems of existing CNC interpolation machining and contouring machining techniques have been pointed out in the background section. This invention establishes a composite cutting motion relationship between the workpiece and the cutting tool, enabling controllable machining of four-lobed waveforms and curves with more than four lobes. The generation of four-lobed waveforms and curves with more than four lobes is independently completed by the composite motion of the workpiece; the cutting tool does not participate in the curve trajectory generation motion, but only needs to complete the cutting machining of the workpiece surface. Therefore, the most mature continuous cutting process can be applied to the machining of four-lobed waveforms and curves with more than four lobes. This fundamentally guarantees the ability to obtain higher machining accuracy, geometrical accuracy, surface quality, and waveform consistency, ensuring the continuous smoothness and precision of the four-lobed waveforms and curves and surfaces of the workpiece. Moreover, the machining process is simpler and more efficient. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Appendix Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0051] Appendix Figure 2 It is attached Figure 1 A partial sectional view;

[0052] Appendix Figure 3 It is attached Figure 1 A schematic diagram of the included guide rail mechanism structure;

[0053] Appendix Figure 4 It is attached Figure 1 Top view;

[0054] Appendix Figure 5 It is attached Figure 1 The left view;

[0055] Appendix Figure 6 This is a top view schematic diagram of the machining of the four-lobed waveform curve of the workpiece cross section according to Embodiment 1 of the present invention;

[0056] Appendix Figure 7 This is a schematic diagram of the crankshaft structure in Embodiment 1 of the present invention;

[0057] Appendix Figure 8 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0058] Appendix Figure 9 It is attached Figure 8 A partial sectional view;

[0059] Appendix Figure 10 This is a structural schematic diagram of Embodiment 3 of the present invention.

[0060] in,

[0061] 1. Enclosure;

[0062] 21 First power shaft; 22 Second power shaft;

[0063] 3. Steering gearbox A; 31. First power output shaft;

[0064] 4. Splined drive shaft;

[0065] 5. Steering gearbox B; 51. Second power output shaft;

[0066] 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;

[0067] 7 Eccentric shaft; 8 Connecting rod; 9 Worktable; 10 Tool; 11 Workpiece; 12 Fixture; 13 Crankshaft; 14 Power distribution box;

[0068] 15 Power source; 16 Power transmission mechanism. Detailed Implementation

[0069] 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.

[0070] Example 1:

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] The second power output shaft 51 is parallel to the first power output shaft 31. The second power output shaft 51 extends out of the housing and the end of the worktable 9 is fixedly installed. The surface of the worktable 9 is perpendicular to the second power output shaft 51. The second power output shaft 51 drives the worktable 9 to perform circular motion.

[0076] One end of the connecting rod 8 is movably connected to the eccentric shaft 7 or the crankshaft 13 via a bearing, and the other end is movably connected to the second power output shaft 51 via a bearing. The eccentric shaft 7 or the crankshaft 13 drives the steering gearbox B5 and the second power output shaft 51 to perform linear reciprocating motion on the guide frame 6, thereby driving the worktable 9 to perform linear reciprocating motion.

[0077] The second power output shaft 51 drives the worktable 9 in both linear reciprocating motion and circular motion, creating a composite motion. The guide frame 6 is fixedly equipped with four linear guides 61, 62, 63, and 64, which are parallel to the second power shaft 22 of the steering gearbox B5. The top plate of the guide frame 6 fixes two linear guides 63 and 64, which guide the second power output shaft 51 via sliders 65, 66, 67, and 68 and a connecting plate 69. The bottom plate of the guide frame 6 fixes two linear guides 61 and 62, which support and guide the steering gearbox B5 via sliders. The second power output shaft 51 passes vertically through the connecting plate 69 and is connected to it via bearings. The connecting plate 69 is mounted on the linear guides 63 and 64 via sliders 65, 66, 67, and 68.

[0078] The speed ratio between the first power output shaft 31 and the first power shaft 21 is 4:1, and the speed ratio between the second power output shaft 51 and the second power shaft 22 is 1:1. The first power shaft 21, the spline drive shaft 4, and the second power shaft 22 transmit power at the same speed. The speed ratio between the first power output shaft 31 and the second power output shaft 51 is 4:1, and they work synchronously according to the speed ratio of 4:1.

[0079] At the same time, the eccentric shaft 7 moves eccentrically 4 times under the drive of the first power output shaft 31, and then drives the second power output shaft 51 to reciprocate linearly 4 times through the connecting rod 8. The second power output shaft 51 also moves in a circular motion 1 time.

[0080] The second power output shaft 51 drives the worktable 9 to reciprocate linearly 4 times while simultaneously rotating 1 revolution in a circular motion. The ratio of the two motions is 4:1. The direction of the linear reciprocating motion of the worktable 9 is perpendicular to the axis of the circular motion of the worktable 9.

[0081] Preferably, by adjusting the eccentric distance of the eccentric shaft 7 or the rotation radius of the connecting rod journal of the crankshaft 13, such as by replacing a different crankshaft, the rotation radius of the eccentric motion is adjusted, thereby adjusting the length difference between the major and minor axes of the variable elliptical curve contained in each petal of the four-petal waveform curve, and thus adjusting and determining the shape of the four-petal waveform curve.

[0082] Further explanation:

[0083] As attached Figure 6 As shown, and see appendix. Figure 4 A top-view diagram illustrating the machining of the four-lobed waveform curve of workpiece 11's cross-section, showing the machining process and result. Tool 10 is fixed in position. (See attached diagram.) 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. (See attached diagram) Figure 6 The above figure shows the starting position of the eccentric shaft 7; the workpiece moves towards the tool 10 during its circular motion, and the thickness being cut gradually increases, as shown in the attached 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 45 degrees, and simultaneously move 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, as shown in the attached diagram. Figure 6 As shown in the diagram below, the eccentric shaft 7 rotates 180 degrees, completing a full 360-degree rotation, and returns to the starting position. Simultaneously, the workpiece 11 rotates 90 degrees, minimizing the cutting thickness and completing the cutting of one lobe of the four-lobed waveform curve. The lobe curve is a variable elliptical curve. Then, the eccentric shaft completes a second 360-degree rotation, and the workpiece continues to rotate 90 degrees, completing the cutting of the second lobe. Next, the eccentric shaft completes a third 360-degree rotation, and the workpiece continues to rotate 90 degrees, completing the cutting of the third lobe. Finally, the eccentric shaft completes a fourth 360-degree rotation, and the workpiece continues to rotate 90 degrees, accumulating a full 360-degree rotation, completing the cutting of the fourth lobe, and thus completing the machining of the entire four-lobed waveform curve.

[0084] To elaborate further:

[0085] As attached Figure 1 Appendix Figure 4As shown, the fixture 12 clamps the workpiece 11 to be processed and fixes it at the center of the worktable 9. The central axis of the workpiece 11 is coaxial with the second power output shaft 51. Power is input into the transmission mechanism, and the worktable 9 and the workpiece 11 begin to move. The motion is a composite motion formed by the superposition of circular motion and linear reciprocating motion. The linear reciprocating motion goes back and forth 4 times while the circular motion rotates 1 revolution. The second power output shaft 51 drives the workpiece 11 to reciprocate linearly. The straight line formed by the linear reciprocating motion of the points on the central axis of the workpiece 11 serves as the tool feed line for machining the cross-sectional curve of the workpiece. The plane formed by the linear reciprocating motion of the central axis of the workpiece 11 serves as the tool movement plane for machining the curved surface of the workpiece. In the cutting motion, the generation of the four-lobed waveform curve is completed independently by the composite motion of the workpiece 11. The tool 10 does not participate in the generation motion of the four-lobed waveform curve and only needs to complete the surface cutting. Another power-controlled tool 10 feeds along the tool feed line and stops at the desired position, while the workpiece 11 is continuously cut and machined in a continuous compound motion. Each point on the cross-section of the workpiece 11 will repeatedly return to the cutting position in the compound motion cycle, completing the precise machining of the continuous smooth four-lobed waveform curve of the cross-section of the workpiece 11. The tool 10 moves on the tool movement plane to complete the cutting of other cross-sectional curves until the four-lobed waveform surface of the workpiece 11 is machined.

[0086] Example 2:

[0087] As attached Figure 8 Appendix Figure 3 As shown, and see appendix. Figure 4 Appendix Figure 5 , attached Figure 7 Appendix Figure 9 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 rail frame 6, linear guide rails 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, a power distribution box 14, and a power source 15.

[0088] 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, then to the steering gearbox B5 via the spline drive shaft 4, in a series transmission manner; 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 via the power distribution box 14, in a parallel transmission manner. Other aspects are the same as in Embodiment 1 and will not be repeated here. (See attached...) Figure 6 Appendix Figure 8 As shown, and see appendix. Figure 4 The following is a top view diagram illustrating the machining of the four-lobed waveform curve of workpiece section 11, and a further explanation of the machining process. The content is the same as in Example 1 and will not be repeated here.

[0089] Example 3:

[0090] 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 4:1, and maintain synchronous movement according to the speed ratio of 4:1.

[0091] 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.

[0092] 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 4:1, and they maintain synchronous movement according to the speed ratio of 4:1.

[0093] 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 4:1, and they work synchronously according to the 4:1 speed ratio. The eccentric shaft 7 moves eccentrically 4 times under the drive of the first power output shaft 31, and then drives the second power output shaft 51 to reciprocate linearly 4 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 4 times and rotate synchronously 1 time in a circle. The ratio of their speed ratios is 4:1. The direction of the linear reciprocating motion of the worktable is perpendicular to the axis of the circular motion of the worktable 9.

[0094] Preferably, by adjusting the eccentric distance of the eccentric shaft 7 or the rotation radius of the connecting rod journal of the crankshaft 13, such as by replacing a different crankshaft, the rotation radius 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 petal of the four-petal waveform curve, and thus adjusting and determining the shape of the four-petal waveform curve.

[0095] Further explanation of the top view diagram illustrating the machining of the three-lobed waveform curve of workpiece section 11, and a more detailed explanation of the machining process, is attached. Figure 6 Appendix Figure 10 As shown, see Figure 4 The content is the same as in Example 1, and will not be repeated here.

[0096] 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 housing, a drive shaft, a steering gearbox A, a steering gearbox B, a sliding transmission shaft, a guide rail mechanism, an eccentric shaft or crankshaft, and a connecting rod, characterized in that: The power shaft includes a first power shaft of steering gearbox A and a second power shaft of steering gearbox B; Steering gearbox A is fixedly mounted on the housing, on which a first power shaft and a first power output shaft are arranged perpendicularly to each other. An eccentric shaft or crankshaft is mounted at the end of the first power output shaft. Steering gearbox B is mounted on a guide rail mechanism, on which a second power shaft and a second power output shaft are arranged perpendicularly to each other. The guide rail mechanism is fixedly mounted on the housing. The second power output shaft is parallel to the first power output shaft and extends out of the housing; The first power shaft of steering gearbox A is connected to the second power shaft of steering gearbox B through a sliding transmission shaft. One end of the connecting rod is movably connected to the eccentric shaft or crankshaft, and the other end is movably connected to the second power output shaft. The eccentric shaft or crankshaft drives steering gearbox B and the second power output shaft to perform linear reciprocating motion on the guide rail mechanism. The speed ratio between the first power output shaft and the second power output shaft is n:1, where n is an integer that is divisible by 360, greater than or equal to 4 and less than or equal to 180, and they are kept synchronized.

2. The transmission mechanism according to claim 1, characterized in that, The guide rail mechanism includes a guide rail frame, linear guide rails, sliders, and connecting plates. The guide rail frame is fixedly equipped with four linear guide rails, which are parallel to the second power shaft of the steering gearbox B. Two linear guide rails are fixed to the top plate of the guide rail frame, and the second power output shaft is guided by the sliders and connecting plates. Two linear guide rails are fixed to the bottom plate of the guide rail frame, and the steering gearbox B is supported and guided by the sliders. The second power output shaft passes vertically through the connecting plate and is connected to the connecting plate by bearings. The connecting plate is mounted on the linear guide rails by the sliders on it.

3. The transmission mechanism according to claim 1, characterized in that, The radius of eccentric motion can be changed by adjusting the eccentric distance of the eccentric shaft or by adjusting the rotation radius of the crankshaft.

4. The transmission mechanism according to claim 1, characterized in that, The sliding transmission shaft is a splined transmission shaft.

5. A transmission mechanism, comprising a housing, a drive shaft, a steering gearbox A, a power distribution box, a steering gearbox B, a sliding drive shaft, a guide rail mechanism, an eccentric shaft or crankshaft, and a connecting rod, characterized in that: The power shaft includes a first power shaft of steering gearbox A and a second power shaft of steering gearbox B; Steering gearbox A is fixedly mounted on the housing, on which a first power shaft and a first power output shaft are arranged perpendicularly to each other. An eccentric shaft or crankshaft is mounted at the end of the first power output shaft. Steering gearbox B is mounted on a guide rail mechanism, on which a second power shaft and a second power output shaft are provided perpendicularly to each other. The guide rail mechanism is fixedly mounted on the housing. The second power output shaft is parallel to the first power output shaft and extends out of the housing; The first power shaft is connected to the second power shaft of the steering gearbox B via a sliding transmission shaft. The power distribution box is fixedly installed on the housing and is located between the first power shaft and the sliding transmission shaft of steering gearbox A, so that power can be transmitted to steering gearbox A and steering gearbox B at the same time. One end of the connecting rod is movably connected to the eccentric shaft or crankshaft, and the other end is movably connected to the second power output shaft. The eccentric shaft or crankshaft drives the steering gearbox B and the second power output shaft to perform linear reciprocating motion on the guide rail mechanism. The speed ratio between the first power output shaft and the second power output shaft is n:1, where n is an integer that is divisible by 360, greater than or equal to 4 and less than or equal to 180, and they are kept synchronized.

6. The transmission mechanism according to claim 5, characterized in that, The guide rail mechanism includes a guide rail frame, linear guide rails, sliders, and connecting plates. The guide rail frame is fixedly equipped with four linear guide rails, which are parallel to the second power shaft of the steering gearbox B. Two linear guide rails are fixed to the top plate of the guide rail frame, and the second power output shaft is guided by the sliders and connecting plates. Two linear guide rails are fixed to the bottom plate of the guide rail frame, and the steering gearbox B is supported and guided by the sliders. The second power output shaft passes vertically through the connecting plate and is connected to the connecting plate by bearings. The connecting plate is mounted on the linear guide rails by the sliders on it.

7. The transmission mechanism according to claim 5, characterized in that, The radius of eccentric motion can be changed by adjusting the eccentric distance of the eccentric shaft or by adjusting the rotation radius of the crankshaft.

8. The transmission mechanism according to claim 5, characterized in that, The sliding transmission shaft is a splined transmission shaft.

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