A sinusoidal trajectory reciprocating drive mechanism for a pump, a pump and a linear drive mechanism

Abstract

A sine track reciprocating drive mechanism of a pump, comprising a motor, a speed reducer and a reciprocating mechanism, the speed reducer is installed on the motor and driven by the motor, the reciprocating mechanism comprises a cylinder sleeve, a piston, a first sine track cylinder, a connecting pin, the first sine track cylinder comprises a cylinder segment and a connecting end, the cylinder segment is provided with a sine track groove or a sine track boss, the connecting end is connected with an output shaft of the speed reducer, the connecting pin comprises a cylinder segment and a front segment, the front segment is provided with a shape matched with the sine track groove or the sine track boss and installed on the sine track groove or the sine track boss of the first sine track cylinder, the piston is sleeved on the cylinder segment of the first sine track cylinder and limited on the first sine track cylinder by the connecting pin, and can rotate with the first sine track cylinder and axially reciprocate, an axial guide mechanism is arranged between the speed reducer and the piston.

Description

Technical Field

[0001] This invention relates to a pump and a linear drive mechanism, and more particularly to a sinusoidal reciprocating pump and a linear drive mechanism. Background Technology

[0002] Due to environmental protection and energy conservation needs, automotive lightweighting has become a crucial project and trend in the global automotive industry. Lightweighting, in essence, refers to reducing the vehicle's curb weight as much as possible while maintaining its strength and safety performance, thereby improving performance, reducing fuel consumption, and minimizing exhaust pollution. Research data shows that a 10% reduction in vehicle weight can improve fuel efficiency by approximately 6% to 8%, and a 100kg reduction in curb weight can reduce fuel consumption by approximately 0.3 to 0.6 liters per 100 kilometers. Therefore, lightweighting significantly benefits overall vehicle fuel economy, vehicle control stability, and collision safety.

[0003] Currently, some high-end vehicles are equipped with LiDAR and cameras that support automatic parking and assisted driving, enabling reliable perception, detection, and accurate assessment of the external environment. However, due to the influence of external environmental factors, LiDAR and cameras require cleaning. Current cleaning systems use large and heavy cleaning pumps, requiring significant installation space and increasing the overall vehicle weight. Furthermore, the linear drive mechanisms currently used in automotive central locking systems also suffer from large size and weight, requiring considerable space, complicating design and installation, and further increasing vehicle weight. Therefore, there is an urgent need to design a suitable pump and linear drive mechanism. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a sinusoidal trajectory reciprocating drive mechanism for a pump, which has a compact structure, small size and light weight.

[0005] The present invention also provides a sinusoidal trajectory reciprocating pump, which occupies little vehicle space and can reduce the weight of the whole vehicle. The pump can use cleaning fluid to clean radar and camera, and can also be used as an air pump to blow away water droplets on the cleaned radar and camera, preventing residual water droplets on the radar and camera surface from affecting the accuracy of use.

[0006] The technical problem to be solved by the present invention is to provide a linear drive mechanism for driving the central locking system of an automobile. This linear drive mechanism is not only convenient for design and installation, but also reduces the weight of the entire vehicle. Similarly, this linear drive mechanism can also be applied to other systems that require linear drive.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0008] A sinusoidal trajectory reciprocating drive mechanism for a pump includes a motor, a reducer, and a reciprocating mechanism. The reducer is mounted on the motor and driven by the motor. The reciprocating mechanism includes a cylinder liner, a piston, a first sinusoidal trajectory cylinder, and a connecting pin. The first sinusoidal trajectory cylinder includes a cylindrical section and a connecting end. A sinusoidal trajectory groove or a sinusoidal trajectory boss is provided on the cylindrical section. The connecting end is connected to the output shaft of the reducer. The connecting pin includes a cylindrical section and a front section. The front section is shaped to mate with the sinusoidal trajectory groove or the sinusoidal trajectory boss and is mounted on the sinusoidal trajectory groove or the sinusoidal trajectory boss of the first sinusoidal trajectory cylinder. The piston is sleeved on the cylindrical section of the first sinusoidal trajectory cylinder and limited on the first sinusoidal trajectory cylinder by the connecting pin. It can move axially reciprocally as the first sinusoidal trajectory cylinder rotates. An axial guide mechanism is provided between the reducer and the piston.

[0009] More preferably, the axial guiding mechanism is as follows: an axial guide is provided on the reducer or a flange is fixed to one end of the reducer, an axial guide is provided on the flange, and a corresponding axial guide hole is provided on the piston. The axial guide is inserted into the axial guide hole, and the piston is guided by the axial guide to move axially back and forth.

[0010] Even better, the piston is provided with a through groove to accommodate the fixing member, and an arc-shaped groove is also provided in the through groove. Another arc-shaped groove is provided on the fixing member. The arc-shaped groove and the other arc-shaped groove form a cylindrical groove to accommodate the cylindrical section of the connecting pin. The cylindrical section of the connecting pin can rotate when moving. The fixing member is provided with spring clips on both sides. The through groove is also provided with snap grooves that cooperate with the spring clips on both sides of the fixing member. After the fixing member is inserted into the through groove, its spring clips snap into the snap grooves to fix it. The arc-shaped bottom surface of the fixing member fits against the top arc surface of the front section of the connecting pin, fitting the front section into the groove, which facilitates installation.

[0011] Even better, the spring clip of the fastener is also provided with a V-shaped groove, which can enhance the elasticity of the spring clip and make it easier to install the fastener.

[0012] Better still, the fixing member is a second fixing member, the end face of which is fitted with the end face of the combined rotating wheel fixing frame to radially position the combined rotating wheel. The piston is a second piston, with a through groove to accommodate the second fixing member. The through groove also has an arc-shaped groove. The second fixing member has another arc-shaped groove. The arc-shaped groove and the other arc-shaped groove form a cylindrical section to accommodate the fixing frame of the combined transmission wheel. The cylindrical section can rotate when the second piston moves axially. The combined transmission wheel includes a fixing frame, two rollers, and a support shaft. The rollers are sleeved on the support shaft, and the support shaft is tightened in the fixing frame. The rollers can rotate freely on the support shaft. The two rollers are arranged opposite each other, with a spacing consistent with the thickness of the sinusoidal trajectory boss. The inner side of the rollers is fitted with the side of the sinusoidal trajectory boss of the second sinusoidal trajectory cylinder and rolls on the sinusoidal trajectory boss, thereby driving the second piston to perform axial reciprocating motion.

[0013] A pump including the above-mentioned sinusoidal reciprocating drive mechanism is also provided, which further includes a piston ring and a pump cover. The piston ring is installed in the annular groove of the piston and slides in cooperation with the cylinder liner. The pump cover is fixed to the cylinder liner and is provided with a one-way fluid inlet mechanism and a one-way fluid outlet mechanism. The cylinder liner is installed on a reducer, and the piston moves axially reciprocally.

[0014] Better still, the one-way fluid inlet mechanism is as follows: the pump cover is provided with a primary fluid inlet hole and a secondary fluid inlet hole connected thereto in sequence, a diaphragm is installed in the secondary fluid inlet hole, a tertiary fluid inlet hole and an annular boss are also provided on the upper end face of the cylinder liner, the two ends of the fluid inlet spring are respectively tightly attached to the annular boss and the inner bottom surface of the diaphragm. When the diaphragm is normal, it seals the primary fluid inlet hole. When the piston runs from right to left in the inner cavity of the cylinder liner and forms a negative pressure, the external force pushes the diaphragm to compress the fluid inlet spring and connect the primary fluid inlet hole and the secondary fluid inlet hole.

[0015] Better still, the one-way fluid discharge mechanism is as follows: the cylinder liner is provided with a primary discharge hole on its upper end face, and the pump cover is provided with a secondary discharge hole and a quaternary discharge hole respectively. A through hole is provided between the secondary discharge hole and the quaternary discharge hole. A tertiary discharge groove is evenly provided around the through hole. A sealing rod and a discharge spring are installed in the secondary discharge hole. The two ends of the discharge spring are respectively in close contact with the annular surface of the through hole and the annular boss of the sealing rod. Under normal conditions, the bottom surface of the annular boss of the sealing rod seals the primary discharge hole on the cylinder liner.

[0016] A linear drive mechanism includes a motor, a reducer, and a reciprocating mechanism. The reducer is mounted on the motor and driven by the motor. The reciprocating mechanism includes a housing, a drive rod, a first sinusoidal trajectory cylinder, and a connecting pin. The first sinusoidal trajectory cylinder includes a cylindrical section and a connecting end. A sinusoidal trajectory groove or a sinusoidal trajectory boss is provided on the cylindrical section. The connecting end is connected to the output shaft of the reducer. The connecting pin includes a cylindrical section and a front section. The front section is shaped to mate with the sinusoidal trajectory groove or the sinusoidal trajectory boss and is mounted on the sinusoidal trajectory groove or the sinusoidal trajectory boss of the first sinusoidal trajectory cylinder. One end of the drive rod is sleeved on the cylindrical section of the first sinusoidal trajectory cylinder and limited on the first sinusoidal trajectory cylinder by the connecting pin. It can reciprocate axially as the first sinusoidal trajectory cylinder rotates. The other end is supported by the other end of the housing. An axial guide mechanism is provided between the reducer and the piston.

[0017] More preferably, the axial guiding mechanism is as follows: an axial guide is provided on the reducer or a flange is fixed to one end of the reducer, an axial guide is provided on the flange, and a corresponding axial guide hole is provided on the piston. The axial guide is inserted into the axial guide hole, and the piston is guided by the axial guide to move axially back and forth.

[0018] Even better, the drive rod is provided with a through groove to accommodate the fixing member, and an arc-shaped groove is also provided in the through groove. Another arc-shaped groove is provided on the fixing member. The arc-shaped groove and the other arc-shaped groove form a cylindrical groove to accommodate the cylindrical section of the connecting pin. The cylindrical section of the connecting pin can rotate when moving. The fixing member is provided with spring clips on both sides. The through groove is also provided with snap grooves that cooperate with the spring clips on both sides of the fixing member. After the fixing member is inserted into the through groove, its spring clips snap into the snap grooves to fix it. The arc-shaped bottom surface of the fixing member fits against the top arc surface of the front section of the connecting pin, fitting the front section into the groove, which facilitates installation.

[0019] Better still, the fixing member is a second fixing member, the end face of which is fitted with the end face of the combined rotating wheel fixing frame to radially position the combined rotating wheel. The piston is a second piston, with a through groove to accommodate the second fixing member. The through groove also has an arc-shaped groove. The second fixing member has another arc-shaped groove. The arc-shaped groove and the other arc-shaped groove form a cylindrical section to accommodate the fixing frame of the combined transmission wheel. The cylindrical section can rotate when the second piston moves axially. The combined transmission wheel includes a fixing frame, two rollers, and a support shaft. The rollers are sleeved on the support shaft, and the support shaft is tightened in the fixing frame. The rollers can rotate freely on the support shaft. The two rollers are arranged opposite each other, with a spacing consistent with the thickness of the sinusoidal trajectory boss. The inner side of the rollers is fitted with the side of the sinusoidal trajectory boss of the second sinusoidal trajectory cylinder and rolls on the sinusoidal trajectory boss, thereby driving the second piston to perform axial reciprocating motion.

[0020] Compared with the prior art, the advantages of the present invention are as follows: the sinusoidal trajectory reciprocating drive mechanism of the pump and the pump and linear drive mechanism adopt a sinusoidal trajectory cylinder to drive the piston or drive rod to perform continuous axial reciprocating motion to output pressurized gas / liquid and linear reciprocating drive. Its structure is more compact, small in size and light in weight, and also has the advantages of low vibration. Therefore, as a liquid pump, it is also suitable for cleaning radar and cameras. As an air pump, it can also be used to blow cleaned radar and cameras. As a linear drive mechanism, it is also suitable for car central locking drive. Similarly, this linear drive mechanism can also be applied to other systems that require linear drive. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of Embodiment 1 and Embodiment 2 of a sinusoidal trajectory reciprocating pump according to the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of a sinusoidal trajectory reciprocating pump according to Embodiment 1 of the present invention.

[0023] Figure 3 yes Figure 2 AA sectional view.

[0024] Figure 4 This is an exploded view of the pump body in Embodiment 1 of the present invention.

[0025] Figure 5-1 , 5-2 These are schematic diagrams of the pump cover structure in Embodiments 1 and 2 of the present invention.

[0026] Figure 6 This is a schematic diagram of the first piston in Embodiment 1 of the present invention.

[0027] Figure 7-1 , 7-2 Figure 7-3 is a schematic diagram of the first sinusoidal trajectory cylinder in Embodiments 1 and 3 of the present invention.

[0028] Figure 8 This is a schematic diagram of the transmission pin in Embodiments 1 and 3 of the present invention.

[0029] Figure 9 This is a schematic diagram of the first fixing member in Embodiments 1 and 3 of the present invention.

[0030] Figure 10 This is a schematic diagram of the second piston in Embodiment 2 of the present invention.

[0031] Figure 11-1 , 11-2 Figures 11-3 are schematic diagrams of the second sinusoidal trajectory cylinder in Embodiments 2 and 4 of the present invention.

[0032] Figure 12 This is a schematic diagram of the combined transmission wheel in Embodiments 2 and 4 of the present invention.

[0033] Figure 13 This is a schematic diagram of the second fixing member in Embodiments 2 and 4 of the present invention.

[0034] Figure 14 These are schematic diagrams of a sinusoidal trajectory reciprocating linear drive mechanism according to Embodiments 3 and 4 of the present invention.

[0035] Figure 15 This is a schematic diagram of the structure of a sinusoidal trajectory reciprocating linear drive mechanism according to Embodiment 3 of the present invention.

[0036] Figure 16 yes Figure 15 BB cross-sectional view.

[0037] Figure 17 This is an exploded view of the transmission part in Embodiment 3 of the present invention.

[0038] Figure 18 This is a schematic diagram of the first drive rod in Embodiment 3 of the present invention.

[0039] Figure 19 This is a schematic diagram of the second drive rod in Embodiment 4 of the present invention. Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example 1:

[0041] like Figures 1 to 9 As shown, a sinusoidal reciprocating pump includes a motor 1, a reducer 2, and a pump body 3.

[0042] The reducer 2 can be a gear reducer, planetary gear reducer, cycloidal pinwheel reducer, worm gear reducer or other types of reducers. It is fixed on the motor 1 and driven by the motor shaft 11. Its transmission shaft 21 can be connected to the pump body 3 of the present invention and drive the pump body 3.

[0043] The pump body 3 includes a pump cover 32, a diaphragm 33, a sealing rod 36, a cylinder liner 37, a first piston 38, a piston ring 39, a first sinusoidal trajectory cylinder 310, a transmission pin 311, a first fixing member 312, a guide member 313, a connecting flange 315, and a first cylindrical bearing 317.

[0044] The connecting flange 315 is provided with mounting holes 3153 and is installed and fixed on the reducer 2 by screws 316. The center of the flange is provided with an inner hole 3151 for fixing the first cylindrical bearing 317. The outer circle is provided with a pin hole 3154 and the cylinder liner 37 is fixed on it by a fixing pin 314, so that the connection between the two is more secure and reliable. The end face is provided with a fixing hole 3152 for fixing the guide 313.

[0045] The first sinusoidal trajectory cylinder 310 is provided with a sinusoidal trajectory groove 3101, which is installed in the first cylindrical bearing 317. The first cylindrical bearing 317 supports it and limits its axial and radial movement, allowing it to rotate within the first cylindrical bearing 317. It is connected to the drive shaft 21 of the reducer 2 through the flat hole 3102 at its end to drive its rotation.

[0046] The piston ring 39 is installed in the annular groove 385 of the first piston 38, and the piston ring 39 slides with the inner cylindrical surface 372 of the cylinder liner 37 to provide a sealing function.

[0047] The first piston 38 is limited on the first sinusoidal trajectory cylinder 310 by the transmission pin 311, and is driven to perform axial reciprocating motion by the rotation of the first sinusoidal trajectory cylinder 310 through the transmission pin 311.

[0048] The first piston 38 is provided with a through groove 381 to accommodate the first fixing member 312. The through groove 381 is also provided with an arc groove 382. The first fixing member 312 is provided with another arc groove 3121. The arc groove 382 and the other arc groove 3121 form a cylindrical groove to accommodate the fixed cylindrical section 3111 of the transmission pin 311, thereby fixing the transmission pin 311.

[0049] The through groove 381 is also provided with snap grooves 384 on both sides to cooperate with the spring clips 3122 on both sides of the first fixing member 312. After the first fixing member 312 is inserted into the through groove 381, its spring clips 3122 are snapped into the snap grooves 384 and fixed.

[0050] The first piston 38 has a guide hole 383 on its end face, which slides and guides the guide member 313 fixed on the connecting flange 315. This can better guide the axial reciprocating motion of the first piston 38, avoid vibration, and improve the sealing effect of the piston ring 39.

[0051] The first piston 38 has an inner circular surface 386 at its center, which fits against the outer arc surface 3112 of the transmission pin 311, thus radially limiting the transmission pin 311.

[0052] The transmission pin 311 includes a fixed cylindrical section 3111 and a sliding cylindrical section 3113. An outer arc surface 3112 is provided between the fixed cylindrical section 3111 and the sliding cylindrical section 3113. The sliding cylindrical section 3113 is installed in the sinusoidal trajectory groove 3101 and cooperates with the side surface 3104 of the groove, so that it can slide smoothly along the sinusoidal trajectory groove 3101. The axial movement direction is switched at the upper reversing point 3105 and the lower reversing point 3103 of the sinusoidal trajectory groove 3101. The outer arc surface 3112 fits against the inner arc bottom surface 3123 of the first fixing member 312 to radially limit the transmission pin 311.

[0053] The pump cover 32 is tightened into the threaded hole 374 of the cylinder liner 37 through the screw hole 323, thereby fixing the pump cover 32 to the cylinder liner 37.

[0054] A one-way gas / liquid inlet valve and a one-way gas / liquid outlet valve and a channel are provided between the pump cover 32 and the cylinder liner 37.

[0055] The one-way gas / liquid inlet valve and channel of this embodiment: The pump cover 32 is provided with a first-stage inlet hole 324, a second-stage inlet hole 326 and a third-stage inlet hole 327 that are interconnected. A diaphragm 33 is installed in the third-stage inlet hole 327. A fourth-stage inlet hole 371 is provided at a corresponding position on the upper end face of the cylinder liner 37. The two ends of the first spring 34 are respectively tightly attached to the annular boss and the inner bottom surface of the diaphragm. Under normal conditions, the diaphragm 33 seals the second-stage inlet hole 326. When the first piston 38 moves from right to left in the inner cavity of the cylinder liner 37 and forms a negative pressure, the external gas / liquid pushes the diaphragm 33 to compress the first spring 34, thereby connecting the second-stage inlet hole 326 and the third-stage inlet hole 327. The external gas / liquid enters the inner cavity from the first to the fourth-stage inlet holes in sequence. When the first piston 38 moves from left to right in the inner cavity of the cylinder liner 37 and forms a positive pressure, the first spring 34 resets and presses the diaphragm 33 to seal the second-stage inlet hole 326, preventing the inner cavity from depressurizing.

[0056] The one-way gas / liquid discharge valve and channel of this embodiment: The cylinder liner 37 is provided with a primary discharge hole 373 on its upper end face, the pump cover 32 is provided with a secondary discharge hole 328 and a quaternary discharge hole 325 at corresponding positions, a through hole 321 is provided between the secondary discharge hole 328 and the quaternary discharge hole 325, a plurality of tertiary discharge grooves 322 are evenly provided around the through hole 321, a sealing rod 36 and a second spring 35 are installed in the secondary discharge hole 328, and the sealing rod 36 seals the primary discharge hole 373 on the cylinder liner 37 under normal conditions.

[0057] When the first piston 38 moves from right to left to create negative pressure, the second spring 35 presses against the sealing rod 36 to form a seal and prevent leakage. When the first piston 38 moves from left to right in the inner cavity of the cylinder liner 37 to create positive pressure, the compressed gas / liquid in the inner cavity of the cylinder liner 37 pushes the sealing rod 36 to compress the second spring 35, thereby connecting the first-stage discharge hole 373 with the second-stage discharge hole 328. Pressurized gas / liquid is discharged sequentially from the first-stage discharge hole 373, the second-stage discharge hole 328, the third-stage discharge groove 322, and the fourth-stage discharge hole 325. Example 2:

[0058] like Figures 10 to 13 As shown, a sinusoidal trajectory reciprocating pump is identical to the sinusoidal trajectory reciprocating pump in Embodiment 1, except that the second piston 330, the second sinusoidal trajectory cylinder 340, the combined transmission wheel 350, and the second fixing member 360 are different from the corresponding parts used in Embodiment 1 and are replaced.

[0059] The second sinusoidal trajectory cylinder 340 is provided with a sinusoidal trajectory boss 3401, which is different from the sinusoidal trajectory groove provided with the first sinusoidal trajectory cylinder 310. Apart from this, the rest of the structure and function are exactly the same as the first sinusoidal trajectory cylinder 310.

[0060] The second piston 330 has a positioning surface 3304 on its central cylindrical surface, which fits against the end face 35012 of the combined rotating wheel 350 fixing frame 3501, to radially position the combined rotating wheel 350. Apart from this, its structure and function are exactly the same as the first piston 38.

[0061] The second fixing member 360 has an end face 3603 that fits against the end face 35012 of the fixing frame 3501 of the combined rotating wheel 350 to radially position the combined rotating wheel 350. Apart from this, the structure and function are exactly the same as the first fixing member 312.

[0062] The second piston 330 is provided with a through groove 3301 to accommodate the second fixing member 360. The through groove 3301 is also provided with an arc-shaped groove 3302. The second fixing member 360 is provided with another arc-shaped groove 3601. The arc-shaped groove 3601 and the other arc-shaped groove 3302 form a cylindrical section 35011 to accommodate the fixing frame 3501 of the combined transmission wheel 350. The cylindrical section 35011 can rotate when the second piston 330 moves axially.

[0063] The combined transmission wheel 350 includes a fixed frame 3501, two rollers 3502 and a support shaft 3503.

[0064] The roller 3502 is sleeved on the support shaft 3503, and the support shaft 3503 is tightened in the threaded hole 35013 provided in the fixing frame 3501. The roller 3502 can rotate freely on the support shaft 3503.

[0065] The two rollers 3502 are arranged opposite each other, with the spacing being consistent with the thickness of the sinusoidal trajectory boss 3401. The inner side of the roller 3502 is attached to the side 3404 of the sinusoidal trajectory boss of the second sinusoidal trajectory cylinder 340 and rolls on the sinusoidal trajectory boss, thereby driving the second piston 330 to perform axial reciprocating motion.

[0066] Similarly, the roller 3502 can be replaced with a clamping part. Two clamping parts are arranged opposite each other to form a groove with a width consistent with the thickness of the sinusoidal trajectory boss 3401. The inner side of the clamping part is attached to the side surface 3404 of the sinusoidal trajectory boss of the second sinusoidal trajectory cylinder 340 and moves on the sinusoidal trajectory boss, thereby driving the second piston 330 to perform axial reciprocating motion. However, the smoothness of the movement of the second piston 330 is slightly worse than that of using a roller. Example 3:

[0067] like Figures 14 to 18 As shown, a sinusoidal trajectory reciprocating linear drive mechanism includes a motor 1, a reducer 2, and a transmission part 4.

[0068] The motor 1 and reducer 2 are exactly the same as in Embodiment 1. The transmission part 4 includes a housing 41, a second cylindrical bearing 42, a first drive rod 43, a first sinusoidal trajectory cylinder 310, a transmission pin 311, a first fixing member 312, a guide member 313, a connecting flange 315, and a first cylindrical bearing 317, etc.

[0069] The transmission part 4 uses the same components as in Embodiment 1, and its structure and function are completely the same as in Embodiment 1.

[0070] The housing 41 has a fixing hole 411 at the center of one end for fixing the second cylindrical bearing 42. The second cylindrical bearing 42 supports and positions the first drive rod 43 during axial reciprocating motion. A pin hole 412 is provided on the cylindrical surface of the other end. A fixing pin 314 is used to fix the housing 41 to the connecting flange 315 through the pin hole 412, making the connection between the two more secure and reliable.

[0071] The first drive rod 43 is provided with a through groove 431 to accommodate the first fixing member 312. The through groove 431 is also provided with an arc groove 432. The first fixing member 312 is provided with another arc groove 3121. The arc groove 432 and the other arc groove 3121 form a cylindrical groove to accommodate the fixed cylindrical section 3111 of the transmission pin 311, thereby fixing the transmission pin 311.

[0072] The through groove 431 is also provided with snap grooves 434 on both sides to cooperate with the spring clips 3122 on both sides of the first fixing member 312. After the first fixing member 312 is inserted into the through groove 431, its spring clips 3122 are snapped into the snap grooves 434 and fixed.

[0073] The first drive rod 43 has a guide hole 433 on its end face, which slides and guides the guide member 313 fixed on the connecting flange 315. This can better guide the axial reciprocating motion of the first drive rod 43 and avoid vibration.

[0074] The first drive rod 43 has an inner circular surface 435 at its center, which fits against the outer arc surface 3112 of the transmission pin 311, thus radially limiting the transmission pin 311. Example 4:

[0075] like Figures 14 to 19 As shown, a sinusoidal trajectory reciprocating linear drive mechanism is identical to the sinusoidal trajectory reciprocating linear drive mechanism in Embodiment 3, except that the second drive rod 44, the second sinusoidal trajectory cylinder 340, the combined transmission wheel 350, and the second fixing member 360 are different from the corresponding parts used in Embodiment 3 and are replaced.

[0076] The second drive rod 44 is provided with a through groove 441 to accommodate the second fixing member 360. The through groove 441 is also provided with an arc groove 442. The second fixing member 360 is provided with another arc groove 3601. The arc groove 442 and the other arc groove 3601 form a cylindrical hole that can accommodate the cylindrical section 35011 of the fixing frame 3501 of the combined transmission wheel 350. In this way, the cylindrical section 35011 can rotate when the second drive rod 360 moves axially.

Claims

1. A sinusoidal trajectory reciprocating drive mechanism for a pump, characterized in that: The system includes a motor, a reducer, and a reciprocating mechanism. The reducer is mounted on and driven by the motor. The reciprocating mechanism includes a cylinder liner, a first piston, a first sinusoidal trajectory cylinder, a transmission pin, and a first fixing member. The first sinusoidal trajectory cylinder includes a cylindrical section and a connecting end. A sinusoidal trajectory groove or a sinusoidal trajectory boss is provided on the cylindrical section. The connecting end is connected to the output shaft of the reducer. The transmission pin includes a cylindrical section and a front section. The front section is shaped to mate with the sinusoidal trajectory groove or the sinusoidal trajectory boss and is mounted on the sinusoidal trajectory groove or the sinusoidal trajectory boss of the first sinusoidal trajectory cylinder. The first piston is fitted onto the cylindrical section of the first sinusoidal trajectory cylinder and is limited by the transmission pin. The reducer is mounted on a chordal trajectory cylinder and can reciprocate axially as the first sine trajectory cylinder rotates. An axial guide mechanism is provided between the reducer and the first piston. The first piston is provided with a through groove for accommodating a fixing member. An arc groove is also provided in the through groove. Another arc groove is provided on the first fixing member. The arc groove and the other arc groove form a cylindrical groove for accommodating the cylindrical section of the transmission pin. The cylindrical section of the transmission pin can rotate when moving. Spring clips are provided on both sides of the first fixing member. Snap grooves that cooperate with the spring clips on both sides of the through groove are also provided on both sides of the first fixing member. After the first fixing member is inserted into the through groove, its spring clips snap into the snap grooves and are fixed. The arc-shaped bottom surface of the first fixing member fits against the top arc surface of the front section of the transmission pin, fitting the front section into the groove.

2. A sinusoidal trajectory reciprocating drive mechanism for a pump, characterized in that: The system includes a motor, a reducer, and a reciprocating mechanism. The reducer is mounted on the motor and driven by the motor. The reciprocating mechanism includes a cylinder liner, a second piston, a second sinusoidal trajectory cylinder, a combined rotating wheel, and a second fixing member. The end face of the second fixing member is fitted with the end face of the combined rotating wheel's fixing frame to radially position the combined rotating wheel. The second piston has a through groove to accommodate the second fixing member, and an arc-shaped groove is also provided in the through groove. The second fixing member has another arc-shaped groove, and the arc-shaped groove and the other arc-shaped groove form a cylindrical section that accommodates the fixing frame of the combined transmission wheel, allowing the cylindrical section to rotate when the second piston moves axially. The combined transmission wheel includes a fixing frame, two rollers, and a support shaft. The rollers are fitted onto the support shaft, and the support shaft is tightened into the fixing frame, allowing the rollers to rotate freely on the support shaft. The two rollers are arranged opposite each other, with a spacing consistent with the thickness of the sinusoidal trajectory boss. The inner side of the rollers is fitted with the side of the sinusoidal trajectory boss of the second sinusoidal trajectory cylinder and rolls on the sinusoidal trajectory boss, thereby driving the second piston to perform axial reciprocating motion.

3. The sinusoidal trajectory reciprocating drive mechanism for a pump as described in claim 1 or 2, characterized in that: The axial guiding mechanism is as follows: an axial guide is provided on the reducer or a flange is fixed to one end of the reducer and an axial guide is provided on the flange. A corresponding axial guide hole is provided on the first piston or the second piston. The axial guide is inserted into the axial guide hole, and the first piston or the second piston is guided by the axial guide to move axially back and forth.

4. A pump, characterized in that: The pump includes a sinusoidal reciprocating drive mechanism as described in any one of claims 1 to 3, further comprising a piston ring and a pump cover. The piston ring is installed in an annular groove of the first piston or the second piston and slides in cooperation with the cylinder liner. The pump cover is fixed to the cylinder liner and is provided with a one-way fluid inlet mechanism and a one-way fluid outlet mechanism. The cylinder liner is installed on a reducer, and the first piston or the second piston moves axially reciprocating.

5. The pump as described in claim 4, characterized in that: The one-way fluid inlet mechanism is as follows: the pump cover is provided with a primary fluid inlet hole and a secondary fluid inlet hole connected thereto in sequence. A diaphragm is installed in the secondary fluid inlet hole. A tertiary fluid inlet hole and an annular boss are also provided on the upper end face of the cylinder liner. The two ends of the fluid inlet spring are respectively in close contact with the annular boss and the inner bottom surface of the diaphragm. When the diaphragm is normal, it seals the primary fluid inlet hole. When the piston runs from right to left in the inner cavity of the cylinder liner and forms a negative pressure, the external force pushes the diaphragm to compress the fluid inlet spring and connect the primary fluid inlet hole and the secondary fluid inlet hole. The unidirectional fluid discharge mechanism is as follows: the cylinder liner is provided with a primary discharge hole on its upper end face, and the pump cover is provided with a secondary discharge hole and a quaternary discharge hole. A through hole is provided between the secondary discharge hole and the quaternary discharge hole. A tertiary discharge groove is evenly provided around the through hole. A sealing rod and a discharge spring are installed in the secondary discharge hole. The two ends of the discharge spring are respectively in close contact with the annular surface of the through hole and the annular boss of the sealing rod. Under normal conditions, the bottom surface of the annular boss of the sealing rod seals the primary discharge hole on the cylinder liner.

6. A linear drive mechanism, characterized in that: The system includes a motor, a reducer, and a reciprocating mechanism. The reducer is mounted on and driven by the motor. The reciprocating mechanism includes a housing, a first drive rod, a first sinusoidal trajectory cylinder, a transmission pin, and a first fixing member. The first sinusoidal trajectory cylinder includes a cylindrical section and a connecting end. A sinusoidal trajectory groove or a sinusoidal trajectory boss is provided on the cylindrical section. The connecting end is connected to the output shaft of the reducer. The transmission pin includes a cylindrical section and a front section. The front section is shaped to mate with the sinusoidal trajectory groove or the sinusoidal trajectory boss and is mounted on the sinusoidal trajectory groove or the sinusoidal trajectory boss of the first sinusoidal trajectory cylinder. One end of the first drive rod is fitted onto the cylindrical section of the first sinusoidal trajectory cylinder and is limited on the first sinusoidal trajectory cylinder by the transmission pin. It can reciprocate axially with the rotation of the first sinusoidal trajectory cylinder, and the other end is supported by the other end of the outer shell. An axial guide mechanism is provided between the reducer and the first drive rod. The first drive rod is provided with a through groove to accommodate the first fixed member. An arc groove is also provided in the through groove. Another arc groove is provided on the first fixed member. The arc groove and the other arc groove form a cylindrical groove to accommodate the cylindrical section of the transmission pin. The cylindrical section of the transmission pin can rotate when moving. Spring clips are provided on both sides of the first fixed member. The two sides of the through groove are also provided with snap grooves that cooperate with the spring clips on both sides of the first fixed member. After the first fixed member is inserted into the through groove, its spring clips snap into the snap grooves and are fixed. The arc bottom surface of the first fixed member fits against the top arc surface of the front section of the transmission pin and fits the front section into the groove.

7. A linear drive mechanism, characterized in that: The device includes a motor, a reducer, and a reciprocating mechanism. The reducer is mounted on the motor and driven by the motor. The reciprocating mechanism includes a housing, a second drive rod, a second sinusoidal trajectory cylinder, a combined rotating wheel, and a second fixing member. The end face of the second fixing member is attached to the end face of the fixing frame of the combined rotating wheel to radially position the combined rotating wheel. The second drive rod has a through groove to accommodate the second fixing member, and an arc-shaped groove is also provided in the through groove. The second fixing member has another arc-shaped groove. The arc-shaped groove and the other arc-shaped groove form a cylindrical segment that accommodates the fixing frame of the combined drive wheel, allowing the cylindrical segment to rotate when the second drive rod moves axially. The combined drive wheel includes a fixing frame, two rollers, and a support shaft. The rollers are sleeved on the support shaft, and the support shaft is tightened in the fixing frame, allowing the rollers to rotate freely on the support shaft. The two rollers are arranged opposite each other, with a spacing consistent with the thickness of the sinusoidal trajectory boss. The inner side of the rollers is attached to the side of the sinusoidal trajectory boss of the second sinusoidal trajectory cylinder and rolls on the sinusoidal trajectory boss, thereby driving the second drive rod to perform axial reciprocating motion.

8. The linear drive mechanism as described in claim 6 or 7, characterized in that: The axial guiding mechanism is as follows: an axial guide is provided on the reducer or a flange is fixed to one end of the reducer and an axial guide is provided on the flange; a corresponding axial guide hole is provided on the first drive rod or the second drive rod; the axial guide is inserted into the axial guide hole; and the first drive rod or the second drive rod is guided by the axial guide to move axially back and forth.

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