A transmission mechanism

Abstract

A transmission mechanism relates to the mechanical manufacturing technology of machining workpieces or other products with variable ellipse cross sections, 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 technology method numerical control interpolation technology cannot guarantee the continuous smoothness of the variable ellipse curve surface of the machined workpiece, and the profiling mold machining cannot meet the high precision requirements, and it is difficult to guarantee the high requirements of the workpiece shape accuracy, surface quality and curve surface consistency; the transmission mechanism is applied to the variable ellipse workpiece machining and manufacturing, which fundamentally solves the above problems, can guarantee the continuous smooth curve surface of the driven controllable machining forming workpiece, and can guarantee the higher machining precision, shape accuracy, surface quality and workpiece curve surface consistency, and the machining process is more simple and efficient.

Description

Technical Field

[0001] This invention relates to mechanical manufacturing technology for workpieces or products with a variable elliptical cross section, and particularly to a transmission mechanism. Background Technology

[0002] For manufacturing workpieces or products with elliptical cross-sections, CNC interpolation and contouring machining are commonly used. A typical application of CNC interpolation is the machining of elliptical piston skirts. A dedicated CNC lathe holds the piston blank and rotates it at a high speed. The tool servo system controls the high-frequency response of the tool and adjusts the feed rate to fit the elliptical curve as closely as possible, thus achieving elliptical machining. Two forces from different directions participate in the crucial process of forming the elliptical curve. During machining, the tool feed must accurately track the spindle rotation angle. Positional errors make it difficult to guarantee contour accuracy. More fundamentally, CNC interpolation technology uses computer-aided point selection or optimized point selection. The tool must complete the cutting process in a high-frequency reciprocating motion, which is a discontinuous cutting process. Steps or arcs will inevitably form between two cutting points, and the machined curve cannot be continuous and smooth. In principle, it is impossible to directly machine a continuous and smooth elliptical curve surface, and the surface quality cannot meet the high requirements. Contouring machining methods are even more difficult to meet high requirements in terms of machining accuracy. Moreover, the machining accuracy and surface quality of the mold itself are also difficult to meet high requirements. A processing technique for the continuous and smooth forming of non-circular curved surfaces on variable elliptical workpieces has not yet been found. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a solution that differs from existing variable elliptical workpiece manufacturing technologies, enabling direct cutting and forming of variable elliptical continuous smooth curved surfaces.

[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 same power source transmits power to steering gearbox A, which in turn transmits power to steering gearbox B via a first power shaft, a sliding transmission shaft, and a second power shaft. Steering gearbox A also transmits power to an eccentric shaft or crankshaft via a 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 2:1, 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 2:1, and they work synchronously according to the speed ratio of 2:1.

[0015] The eccentric shaft moves eccentrically for 2 revolutions under the drive of the first power output shaft, and then drives the second power output shaft to reciprocate linearly twice via the connecting rod. At the same time, the second power output shaft moves in a circular motion for 1 revolution.

[0016] The second power output shaft drives the worktable to reciprocate linearly twice while simultaneously rotating it in a circular motion once. The ratio of their motions is 2:1. 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] As a preferred option, the eccentric distance of the eccentric shaft or the rotation radius of the connecting rod journal of the crankshaft can be adjusted, for example by replacing different crankshafts, to adjust the rotation radius of the eccentric motion, thereby adjusting the length difference between the major and minor axes of the variable ellipse and adjusting the shape of the variable ellipse.

[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 power distribution box, 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.

[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 second power output shaft is 2:1, and the speed ratio between the second power output shaft and the second power output shaft is 1:1. The speed ratio between the first power output shaft and the second power output shaft is 2:1, and they work synchronously according to the speed ratio of 2:1.

[0031] The eccentric shaft moves eccentrically for 2 revolutions under the drive of the first power output shaft, and then drives the second power output shaft to reciprocate linearly twice via the connecting rod. At the same time, the second power output shaft moves in a circular motion for 1 revolution.

[0032] The second power output shaft drives the worktable to reciprocate linearly twice while simultaneously rotating it in a circular motion once. The ratio of their motions is 2:1. 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] As a preferred option, the eccentric distance of the eccentric shaft or the rotation radius of the connecting rod journal of the crankshaft can be adjusted, for example by replacing different crankshafts, to adjust the rotation radius of the eccentric motion, thereby adjusting the length difference between the major and minor axes of the variable ellipse and adjusting the shape of the variable ellipse.

[0035] Option 3:

[0036] This invention does not limit whether the power source is the same power source or the power transmission method (series or parallel). It only requires that the first power output shaft and the second power output shaft connected to the power transmission mechanism are parallel to each other, have a speed ratio of 2:1, and maintain synchronous movement according to the speed ratio of 2:1.

[0037] A transmission mechanism includes a first power output shaft and a second power output shaft connected to a power transmission mechanism, an eccentric shaft or crankshaft, a connecting rod, and a worktable.

[0038] The second power output shaft is parallel to the first power output shaft, and the axes of the two shafts form a defined plane;

[0039] 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.

[0040] An eccentric shaft or crankshaft is installed at the end of the first power output shaft.

[0041] 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.

[0042] The second power output shaft drives the worktable to perform linear reciprocating motion while simultaneously performing circular motion, resulting in a composite motion.

[0043] The speed ratio between the first power output shaft and the second power output shaft is 2:1, and they work synchronously according to the 2:1 speed ratio. The eccentric shaft moves eccentrically for 2 revolutions under the drive of the first power output shaft, and then drives the second power output shaft to reciprocate twice 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 for 1 revolution.

[0044] The second power output shaft drives the worktable to reciprocate linearly twice while simultaneously rotating it in a circular motion once. The ratio of their motions is 2:1. The direction of the linear reciprocating motion of the worktable is perpendicular to the axis of the circular motion of the worktable.

[0045] As a preferred option, the eccentric distance of the eccentric shaft or the rotation radius of the connecting rod journal of the crankshaft can be adjusted, for example by replacing different crankshafts, to adjust the rotation radius of the eccentric motion, thereby adjusting the length difference between the major and minor axes of the variable ellipse and adjusting the shape of the variable ellipse.

[0046] The beneficial effects of this invention are:

[0047] 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 curve cannot be continuously smooth, and this problem persists even with the best physical capabilities. CNC interpolation remains a widely used technique for machining variable elliptical curves and surfaces. This invention is based on the motion law of variable elliptical curves passing through fixed points discovered by the first inventor. Based on this newly discovered motion principle, this invention establishes a method for generating the trajectory of a variable elliptical curve. The generated variable elliptical curve always passes through a fixed point during continuous motion. Each point on the variable elliptical curve can sequentially and continuously pass through this fixed point, repeating cyclically. At this fixed point, the cutting motion relationship between the workpiece and the cutting tool is established, achieving active and controllable continuous cutting of the variable elliptical curve, forming a continuous and smooth variable elliptical curve.

[0048] 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 developed in my country, which can effectively solve the processing and manufacturing problems of workpieces or products with variable elliptical shapes.

[0049] This invention fundamentally eliminates various problems existing in current methods for machining variable elliptical curve surfaces. The problems of existing CNC interpolation machining and contouring machining techniques have been pointed out in the background section. This invention achieves actively controllable machining of variable elliptical curves by establishing a composite cutting motion relationship between the workpiece and the cutting tool. The generation of the variable elliptical curve 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 variable elliptical curve surfaces, which fundamentally guarantees the ability to obtain higher machining accuracy, geometrical accuracy, surface quality, and consistency, ensuring the continuous smoothness and precision of the variable elliptical curve surface of the workpiece, and making the machining process simpler and more efficient. Attached Figure Description

[0050] 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.

[0051] Appendix Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0052] Appendix Figure 2 It is attached Figure 1 A partial sectional view;

[0053] Appendix Figure 3 It is attached Figure 1 A schematic diagram of the included guide rail mechanism structure;

[0054] Appendix Figure 4 It is attached Figure 1 Top view;

[0055] Appendix Figure 5 It is attached Figure 1 The left view;

[0056] Appendix Figure 6 This is a top view schematic diagram of the workpiece cross-section variable elliptical curve machining according to Embodiment 1 of the present invention;

[0057] Appendix Figure 7 This is a schematic diagram of the crankshaft structure in Embodiment 1 of the present invention;

[0058] Appendix Figure 8 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0059] Appendix Figure 9 It is attached Figure 8 A partial sectional view;

[0060] Appendix Figure 10 This is a structural schematic diagram of Embodiment 3 of the present invention.

[0061] in,

[0062] 1. Enclosure;

[0063] 21 First power shaft; 22 Second power shaft;

[0064] 3. Steering gearbox A; 31. First power output shaft;

[0065] 4. Splined drive shafts;

[0066] 5. Steering gearbox B; 51. Second power output shaft;

[0067] 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;

[0068] 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

[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 2:1, 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 2:1, and they work synchronously according to the speed ratio of 2:1.

[0079] At the same time, the eccentric shaft 7 moves eccentrically for 2 revolutions under the drive of the first power output shaft 31, and then drives the second power output shaft 51 to reciprocate linearly twice through the connecting rod 8. The second power output shaft 51 also moves in a circular motion for 1 revolution.

[0080] The second power output shaft 51 drives the worktable 9 to reciprocate linearly twice while simultaneously rotating in a circular motion once. The ratio of their motions is 2:1. 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] As a preferred option, by adjusting the eccentric distance of the eccentric shaft 7 or the rotation radius of the connecting rod shaft diameter of the crankshaft 13, such as by replacing the crankshaft 13 with a different one, the rotation radius of the eccentric motion can be adjusted, thereby adjusting the length difference between the major and minor axes of the variable ellipse and adjusting the shape of the variable ellipse.

[0082] Further explanation:

[0083] As attached Figure 6 As shown, and see appendix. Figure 1 A top-view diagram illustrating the machining of the elliptical curve of workpiece 11's cross-section, showing the machining process and results. 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 11 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 90 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 6As 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 180 degrees, and the cutting thickness is minimized, completing the cutting of half of the variable elliptic curve. In sequence, the eccentric shaft 7 completes the second 360-degree rotation, and the workpiece 11 continues to complete 180-degree rotations, accumulating a total of 360-degree rotations. This completes the continuous cutting and shaping of the entire variable elliptic curve.

[0084] To elaborate further:

[0085] As attached Figure 1 Appendix Figure 4 As 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 11 is coaxial with the second power output shaft 51. Power is input into the transmission mechanism, and the worktable 9 and 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 twice while the circular motion rotates once. 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 elliptical curve is completed independently by the composite motion of the workpiece 11. The tool 10 does not participate in the generation motion of the elliptical 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 elliptical 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 elliptical surface of the workpiece 11 is completed.

[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 9This 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, 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 aspects are the same as in Embodiment 1 and will not be repeated here.

[0089] As attached Figure 6 Appendix Figure 8 As shown, see appendix Figure 4 The following is a top view diagram of the machining of the variable elliptical curve of the 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.

[0090] Example 3:

[0091] 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 2:1, and maintain synchronous movement according to the speed ratio of 2:1.

[0092] 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.

[0093] The power transmission mechanism 16 is provided with a first power output shaft 31 and a second power output shaft 51. The two shafts remain parallel in both stationary and moving states, and their axes form a defined plane. The speed ratio of the first power output shaft 31 to the second power output shaft 51 is 2:1, and they maintain synchronous movement according to the 2:1 speed ratio.

[0094] 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 2:1, and they work synchronously according to the 2:1 speed ratio. The eccentric shaft 7 moves eccentrically for 2 revolutions under the drive of the first power output shaft 31, and then drives the second power output shaft 51 to reciprocate linearly twice via the connecting rod 8. The second power output shaft 51 also moves synchronously in a circular motion for 1 revolution. The second power output shaft 51 drives the worktable 9 to reciprocate linearly twice and rotate synchronously in a circular motion for 1 revolution. The ratio of their speed ratios is 2:1. The direction of the linear reciprocating motion of the worktable is perpendicular to the axis of the circular motion of the worktable 9.

[0095] Preferably, by adjusting the eccentricity of the eccentric shaft 7 or the radius of rotation of the crankshaft 13 (e.g., by replacing the crankshaft 13 with a different one), the radius of rotation of the eccentric motion is adjusted, thereby adjusting the difference in length between the major and minor axes of the variable ellipse and thus the shape of the variable ellipse. A top-view diagram illustrating the machining of the variable elliptical curve of the workpiece 11 section is provided, along with a further explanation of the machining process, as shown in the attached diagram. 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.

[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 2:1, 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 2:1, 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 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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