A double pendulum reciprocating mechanism

Abstract

The embodiment of the present disclosure relates to the field of reciprocating machines, and provides a double-swing-rod reciprocating mechanism, which comprises a swing-rod shaft, a main swing-rod bearing, a main swing rod, a reciprocating rod, a balance swing-rod bearing, a balance swing rod, a balance sleeve and a motor. The balance swing rod comprises a bent rod end and a straight rod end, the bent rod end is connected with the outer ring of the balance swing-rod bearing, and the connection position of the bent rod end and the balance swing-rod bearing is located on the line connecting the first central axis and the second central axis. The double-swing-rod reciprocating mechanism has a good reciprocating balance design, can keep mechanical balance during reciprocating movement, has smaller vibration, and has a simple structure and is easy to manufacture.

Description

Technical Field

[0001] This disclosure relates to the field of reciprocating machinery, and particularly to a double-rocker reciprocating mechanism. Background Technology

[0002] A reciprocating mechanism is a type of mechanism capable of reciprocating motion. Combining reciprocating mechanisms with other structures can create various mechanical tools for automated reciprocating work. A reciprocating mechanism includes a main pendulum rod that drives the reciprocating motion and its bearings. However, the main pendulum rod and its bearings inevitably vibrate during electric propulsion, causing the entire reciprocating mechanism to vibrate. Therefore, vibration damping design is usually required to achieve balance during reciprocating motion. A double-pendulum reciprocating mechanism is one type of reciprocating mechanism. The method for achieving reciprocating balance in a double-pendulum reciprocating mechanism is to add a balance pendulum rod and a balance bearing. When the main pendulum rod is electrically driven, the balance pendulum rod simultaneously moves in the opposite direction. Through the cancellation of opposing forces, the overall net force is zero, reducing the vibration of the double-pendulum reciprocating mechanism and thus achieving reciprocating balance.

[0003] However, the current reciprocating balance design of the double-pendulum reciprocating mechanism is not perfect, and it still generates significant vibrations during use, affecting the overall operation of the machine. At the same time, the current double-pendulum reciprocating mechanism has a complex structure, presenting considerable difficulties in processing and assembly, resulting in high production costs and hindering its large-scale application. Summary of the Invention

[0004] This disclosure provides a double-pendulum reciprocating mechanism, which has at least good stability, can effectively reduce vibration, thereby reducing wear and increasing the service life of the machine.

[0005] According to some embodiments of this disclosure, an embodiment of this disclosure provides a double pendulum reciprocating mechanism, including: a pendulum shaft having a first central axis; a main pendulum bearing, a main pendulum rod, and a reciprocating rod, the main pendulum bearing being sleeved on the pendulum shaft; one end of the main pendulum rod being connected to the outer ring of the main pendulum bearing, and the other end of the main pendulum rod being connected to the reciprocating rod; the reciprocating rod having a second central axis, and the first central axis being parallel to the second central axis; a balance pendulum bearing, a balance pendulum rod, and a balance sleeve, the balance pendulum bearing being sleeved on the pendulum shaft; the balance pendulum rod including a bent end and a straight end, the bent end being connected to the outer ring of the balance pendulum bearing, and the connection between the bent end and the balance pendulum bearing being located between the first central axis and the second central axis. On the line connecting the central axes, the straight rod end is connected to the balance sleeve, which is fitted onto the reciprocating rod; a motor is connected to the pendulum shaft, and the motor drives the pendulum shaft to rotate around the first central axis; wherein, the motor drives the pendulum shaft to rotate around the first central axis, the main pendulum bearing drives the main pendulum to move in a direction parallel to the second central axis, the balance pendulum bearing drives the balance pendulum to move in a direction parallel to the second central axis, and the direction of movement of the main pendulum is opposite to the direction of movement of the balance pendulum; the reciprocating rod moves along the second central axis, and the direction of movement of the reciprocating rod is the same as the direction of movement of the main pendulum; the balance sleeve moves along the second central axis, and the direction of movement of the balance sleeve is the same as the direction of movement of the balance pendulum.

[0006] In some embodiments, the double-swing rod reciprocating mechanism further includes a first sliding sleeve and a second sliding sleeve, the first sliding sleeve and the second sliding sleeve being disposed opposite to each other, and the reciprocating rod passing through the first sliding sleeve and the second sliding sleeve, and the reciprocating rod being slidable between the first sliding sleeve and the second sliding sleeve.

[0007] In some embodiments, a first sliding sleeve is provided with a first sliding pin hole, and a second sliding sleeve is provided with a second sliding pin hole, wherein the cavity of the first sliding pin hole is aligned with the cavity of the second sliding pin hole.

[0008] In some embodiments, the balance sleeve is provided with a third sliding pin hole, and the cavity of the third sliding pin hole is aligned with the cavity of the first sliding pin hole, and the cavity of the third sliding pin hole is aligned with the cavity of the second sliding pin hole.

[0009] In some embodiments, the double-swing rod reciprocating mechanism further includes a connecting block disposed on the reciprocating rod, with one end of the main swing rod connected to the connecting block.

[0010] In some embodiments, the pendulum shaft includes a first sub-shaft, a second sub-shaft, and a central block. The first sub-shaft and the second sub-shaft are symmetrically arranged on both sides of the central block. The diameter of the central block is larger than the diameter of the first sub-shaft, and the diameter of the central block is larger than the diameter of the second sub-shaft. The balance pendulum bearing is sleeved on the first sub-shaft, and the main pendulum bearing is sleeved on the second sub-shaft.

[0011] In some embodiments, the double-rocker reciprocating mechanism further includes a connecting sleeve, which is connected to the second sliding sleeve.

[0012] In some embodiments, the balance rocker bearing includes a multi-row ball rocker bearing.

[0013] In some embodiments, the main rocker arm bearing includes a multi-row ball rocker arm bearing.

[0014] According to some embodiments of this disclosure, another aspect of this disclosure also provides a power tool, including the above-described double-rocker reciprocating mechanism.

[0015] The technical solution provided in this disclosure has at least the following advantages: In the double pendulum reciprocating mechanism provided in this disclosure, a main pendulum bearing and a balance pendulum bearing are provided on the pendulum shaft. The main pendulum bearing is connected to the main pendulum, the main pendulum is connected to the reciprocating rod, the balance pendulum bearing is connected to the balance pendulum, and the balance pendulum is connected to the balance sleeve sleeved on the reciprocating rod. A motor is connected to the pendulum shaft, and the motor drives the pendulum shaft to rotate, which in turn drives the main pendulum bearing and the balance pendulum bearing to move, thereby driving the main pendulum and the balance pendulum to move. The main pendulum then drives the reciprocating rod to slide, and the balance pendulum drives the balance sleeve to slide. In this way, during the movement of the reciprocating rod, the vibration generated by the movement of the reciprocating rod is canceled out by the vibration generated by the balance sleeve, so as to achieve the reciprocating balance of the overall structure. Moreover, the connection point between the balance pendulum and the balance pendulum bearing is on the perpendicular line between the first central axis and the second central axis, which is conducive to improving the mechanical stability of the overall structure and further improving the reciprocating balance effect. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this disclosure or the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a double-rocker reciprocating mechanism.

[0018] Figures 2 to 4 for Figure 1 Some side structural diagrams of the double-rocker reciprocating mechanism in the image;

[0019] Figure 5 for Figure 1 The diagram shows the balance bar bearing and some structural schematics of the balance bar.

[0020] Figure 6 for Figure 1Some structural diagrams of the rocker arm shaft in the diagram;

[0021] Figure 7 A three-dimensional structural schematic diagram of a double-pendulum reciprocating mechanism provided in an embodiment of this disclosure;

[0022] Figure 8 for Figure 7 A schematic diagram of another three-dimensional structure of the double-rocker reciprocating mechanism;

[0023] Figures 9 to 11 for Figure 7 Some structural diagrams of the rocker arm shaft in the diagram;

[0024] Figures 12 to 14 for Figure 7 Schematic diagrams of the balance bar bearing and balance bar in the diagram;

[0025] Figure 15 for Figure 7 A schematic diagram of another three-dimensional structure of the double-pendulum reciprocating mechanism. Detailed Implementation

[0026] As can be seen from the background technology, the design of the double-pendulum reciprocating mechanism urgently needs improvement.

[0027] Analysis revealed that in current double-pendulum reciprocating mechanisms, to prevent collisions between the main pendulum and the balance pendulum during reciprocating motion, the main pendulum and balance pendulum are generally arranged in a staggered configuration. Consequently, the motion trajectory of the balance pendulum and its bearings also changes accordingly. To match the motion trajectory of the balance pendulum and its bearings, the shape of the pendulum shaft connected to the balance pendulum bearings needs to be modified accordingly. As a result, the overall balance of the double-pendulum reciprocating mechanism is compromised, and the manufacturing and assembly difficulty of the pendulum shaft also increases.

[0028] Figure 1 This is a schematic diagram of a double-pendulum reciprocating mechanism. (Reference) Figure 1The double-pendulum reciprocating mechanism 100 includes a pendulum shaft 101, which has a first central axis 11. The double-pendulum reciprocating mechanism 100 also includes a main pendulum bearing 102, a main pendulum rod 112, and a reciprocating rod 122. The main pendulum bearing 102 is sleeved on the pendulum shaft 101. One end of the main pendulum rod 112 is connected to the outer ring of the main pendulum bearing 102, and the other end of the main pendulum rod 112 is connected to the reciprocating rod 122. The reciprocating rod 122 has a second central axis 12, and the first central axis 11 is parallel to the second central axis 12. The double-pendulum reciprocating mechanism 100 also includes a balance pendulum bearing 103, a balance pendulum 113, and a balance sleeve 123. The balance pendulum bearing 103 is sleeved on the pendulum shaft 101. One end of the balance pendulum 113 is connected to the outer ring of the balance pendulum bearing 103, and the other end of the balance pendulum 113 is connected to the balance sleeve 123, which is sleeved on the reciprocating rod 122. The double-pendulum reciprocating mechanism 100 also includes a first sliding sleeve 104 and a second sliding sleeve 114. The first sliding sleeve 104 has a first sliding pin hole (not shown in the figure), and the second sliding sleeve 114 has a second sliding pin hole (not shown in the figure). A sliding pin (not shown in the figure) is provided in both the first and second sliding pin holes, and the sliding pin passes through the balance sleeve 123.

[0029] Figure 2 as well as Figure 3 for Figure 1 Some side structural diagrams of the double-pendulum reciprocating mechanism 100 during reciprocating motion. Figure 4 for Figure 1 A schematic diagram of another side view of the double-rocker reciprocating mechanism 100. (Reference) Figure 2 , Figure 3 as well as Figure 4 In the double pendulum reciprocating mechanism 100, in order to avoid the balance pendulum 113 from colliding with the main pendulum 112 during the reciprocating motion, when the balance pendulum bearing 103 and the balance pendulum 113 are set, the center line of the balance pendulum bearing 103 and the balance pendulum 113 has an angle α with the center line of the main pendulum bearing 102 and the main pendulum 112. Figure 5 for Figure 1 The diagram shows the balance bar bearing and some structural schematics of the balance bar. From left to right, these are the front view, top view, and three-dimensional structural schematic of the balance bar bearing 103 and the balance bar 113. Figure 6 for Figure 1The diagrams show some structural features of the rocker arm shaft 100, from left to right: left view, top view, right view, and front view. It can be seen that to minimize the axial installation distance between the main rocker arm bearing 102 and the balance rocker arm bearing 103, preventing collisions during their opposite swinging motion, the rocker arm shaft 101 is designed with angle b for normal driving of the dual rockers. To accommodate the motion trajectory of the balance rocker arm bearing 103, angle a is also provided on the portion of the rocker arm shaft 101 connected to the balance rocker arm bearing 103. Therefore, manufacturing the rocker arm shaft 101 requires at least a five-axis CNC machining center, significantly increasing the machining difficulty and hindering productization.

[0030] In related technologies, the balance design of the double pendulum reciprocating mechanism 100 has flaws in order to compress the axial installation distance of the main pendulum bearing 102 and the balance pendulum bearing 103. The overall mechanism is prone to vibration during reciprocating motion. Moreover, the pendulum shaft 101 designed based on the balance pendulum bearing 103 has a complex structure, is difficult to process, and has high manufacturing requirements. It is difficult to achieve with general processing equipment and is difficult to commercialize.

[0031] This disclosure provides a double-pendulum reciprocating mechanism, including a motor and a pendulum shaft driven by the motor. A main pendulum bearing and a balance pendulum bearing are sleeved on the pendulum shaft. The main pendulum bearing is connected to the main pendulum, and the main pendulum is connected to the reciprocating rod. When the motor drives the pendulum shaft to rotate, it drives the main pendulum bearing and the main pendulum to move, thereby driving the reciprocating rod to reciprocate. The balance pendulum bearing is connected to the balance pendulum, and the bent end of the balance pendulum is connected to the outer ring of the balance pendulum bearing. The connection point between the bent end and the balance pendulum bearing is located on the line connecting the first central axis and the second central axis. The straight end is connected to a balance sleeve, which is sleeved on the reciprocating rod. When the motor drives the pendulum shaft to rotate, the balance pendulum bearing and the balance pendulum are also driven by the pendulum shaft to move. The balance sleeve is driven by the balance pendulum to reciprocate, and the direction of movement of the balance sleeve is opposite to the direction of movement of the reciprocating rod. The entire double-pendulum reciprocating mechanism has good balance during movement, reduces vibration intensity during reciprocating motion, and the shape of the pendulum shaft is modified, making it easier to manufacture.

[0032] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the disclosure. However, the technical solutions claimed in this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0033] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0034] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0036] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0037] Figure 7 This is a three-dimensional structural diagram of a double-pendulum reciprocating mechanism provided in an embodiment of this disclosure.

[0038] refer to Figure 7This disclosure provides a double-pendulum reciprocating mechanism 200, including a pendulum shaft 201 having a first central axis 21. The double-pendulum reciprocating mechanism 200 also includes a main pendulum bearing 202, a main pendulum rod 212, and a reciprocating rod 222. The main pendulum bearing 202 is sleeved on the pendulum shaft 201. One end of the main pendulum rod 212 is connected to the outer ring of the main pendulum bearing 202, and the other end of the main pendulum rod 212 is connected to the reciprocating rod 222. The reciprocating rod 222 has a second central axis 22, and the first central axis 21 is parallel to the second central axis 22. The double-pendulum reciprocating mechanism 200 also includes a balance pendulum bearing 203, a balance pendulum 213, and a balance sleeve 223. The balance pendulum bearing 203 is sleeved on the pendulum shaft 201. The balance pendulum 213 includes a bent end 23 and a straight end 24. The bent end 23 is connected to the outer ring of the balance pendulum bearing 203, and the connection between the bent end 23 and the balance pendulum bearing 203 is located on the line connecting the first central axis 21 and the second central axis 22. The straight end 24 is connected to the balance sleeve 223, which is sleeved on the reciprocating rod 222. The double-pendulum reciprocating mechanism 200 also includes a motor 204, which is connected to the pendulum shaft 201 and is used to drive the pendulum shaft 201 to rotate around the first central axis 21.

[0039] Figure 8 for Figure 7 A schematic diagram of another three-dimensional structure of the double-pendulum reciprocating mechanism.

[0040] refer to Figure 7 as well as Figure 8 In this configuration, motor 204 drives the pendulum shaft 201 to rotate around the first central axis 21; main pendulum bearing 202 drives the main pendulum 212 to move in a direction parallel to the second central axis 22; balance pendulum bearing 203 drives the balance pendulum 213 to move in a direction parallel to the second central axis 22, and the movement direction of the main pendulum 212 is opposite to that of the balance pendulum 213; reciprocating rod 222 moves along the second central axis 22, and the movement direction of the reciprocating rod 222 is the same as that of the main pendulum 212; balance sleeve 223 moves along the second central axis 22, and the movement direction of the balance sleeve 223 is the same as that of the balance pendulum 213.

[0041] The pendulum shaft 201 is connected to the motor 204. The motor 204 drives the pendulum shaft 201 to rotate around the first central axis 21. When the pendulum shaft 201 rotates, it drives the main pendulum bearing 202 and the balance pendulum bearing 203, which are sleeved on the pendulum shaft 201, to move, thereby driving the entire double pendulum reciprocating mechanism 200. It is understood that the motor 204 can also be connected to the pendulum shaft 201 through a transmission mechanism, which transmits power to the pendulum shaft 201, driving it to rotate. The transmission mechanism can have various structural types, all of which are within the scope of this patent.

[0042] In some embodiments, the double-swing reciprocating mechanism 200 may further include a first sliding sleeve 205 and a second sliding sleeve 215. The first sliding sleeve 205 and the second sliding sleeve 215 are disposed opposite to each other. The reciprocating rod 222 may pass between the first sliding sleeve 205 and the second sliding sleeve 215, and the reciprocating rod 222 may slide between the first sliding sleeve 205 and the second sliding sleeve 215. The first sliding sleeve 205 and the second sliding sleeve 215 are used to support the reciprocating rod 222, preventing the reciprocating rod 222 from slipping during reciprocating motion, making the reciprocating motion process of the double-swing reciprocating mechanism 200 controllable, and reducing the workload of the designer. In some embodiments, the first sliding sleeve 205 may be connected to other connecting mechanisms and / or fixing mechanisms, thereby realizing the connection and / or fixing of the double-swing reciprocating mechanism 200 with other mechanisms, so as to combine the double-swing reciprocating mechanism 200 with other mechanisms for use. In some embodiments, the second sliding sleeve 215 may also be connected to other connecting and / or fixing mechanisms to enable the connection and / or fixing of the double pendulum reciprocating mechanism 200 to other mechanisms for use in combination with other mechanisms.

[0043] In some embodiments, the first sliding sleeve 205 is provided with a first sliding pin hole 225, and the second sliding sleeve 215 is provided with a second sliding pin hole 235, the cavities of the first sliding pin hole 225 and the second sliding pin hole 235 being aligned. The double-rocker reciprocating mechanism also includes a sliding pin (not shown in the figure). The sliding pin passes through the first sliding pin hole 225 on the first sliding sleeve 205 and the second sliding pin hole 235 on the second sliding sleeve 215.

[0044] In some embodiments, the balance sleeve 223 is provided with a third sliding pin hole 233, and the cavity of the third sliding pin hole 233 is aligned with the cavity of the first sliding pin hole 225, and the cavity of the third sliding pin hole 233 is also aligned with the cavity of the second sliding pin hole 235. A sliding pin also passes through the third sliding pin hole 233, allowing the balance sleeve 223 to slide on the sliding pin. The sliding pin guides the balance sleeve to maintain its trajectory during reciprocating motion, improving the tightness of connection between the various structures within the double-rocker reciprocating mechanism 200.

[0045] In some embodiments, the first sliding sleeve 205 may be provided with two first sliding pin holes 225, which may be symmetrically arranged on both sides of the first sliding sleeve 205 relative to the second central axis 22. The second sliding sleeve 215 may also be provided with two second sliding pin holes 235, which may be symmetrically arranged on both sides of the second sliding sleeve 215 relative to the second central axis 22. The two first sliding pin holes 225 on the first sliding sleeve 205 correspond to the two second sliding pin holes 235 on the second sliding sleeve 215, facilitating the insertion of sliding pins. The symmetrically arranged sliding pins help maintain the balance of the balance sleeve 223 during movement, further improving the balance of the double-pendulum reciprocating mechanism 200 and reducing the vibration of the double-pendulum reciprocating mechanism 200 during reciprocating motion.

[0046] When the rocker arm shaft 201 rotates around the first central axis 21, it drives the main rocker arm bearing 202 to move, thereby driving the main rocker arm 212 to move, which in turn drives the reciprocating rod 222 to slide between the first sliding sleeve 205 and the second sliding sleeve 215. The rotation of the rocker arm shaft 201 also drives the balance rocker arm bearing 203 to move, thereby driving the balance rocker arm 213 to move, which in turn drives the balance sleeve 223 to slide on the sliding pin. The reciprocating rod 222 and the balance sleeve 223 move in opposite directions, thus achieving balance of the double rocker arm reciprocating mechanism 200 during the reciprocating motion.

[0047] Figures 9 to 11 for Figure 7 Some structural schematic diagrams of the rocker arm shaft 201 in the diagram. Figure 9 This shows a front view structural schematic diagram of the rocker arm shaft 201. Figure 10 This diagram shows a frontal perspective view of the rocker arm shaft 201. Figure 11 From left to right, the diagrams show the left view, top view, and right view of the swing arm shaft 201.

[0048] In some embodiments, reference Figure 9The rocker arm shaft 201 may include a first sub-shaft 211, a second sub-shaft 221, and a central block 231. Driven by the motor 204, the rocker arm shaft 201 rotates around a first central axis 21. The first sub-shaft 211 and the second sub-shaft 221 are symmetrically arranged on both sides of the central block 231. The diameter of the central block 231 is larger than the diameter of the first sub-shaft 211, and the diameter of the central block 231 is also larger than the diameter of the second sub-shaft 221. A balance rocker arm bearing 203 is sleeved on the first sub-shaft 211, and a main rocker arm bearing 202 is sleeved on the second sub-shaft 221. The diameter of the first sub-shaft 211 can be designed according to the inner ring diameter of the balance rocker arm bearing 203, and the diameter of the second sub-shaft 221 can be designed according to the inner ring diameter of the main rocker arm bearing 202. During the reciprocating motion, the spindle block 231 isolates the main pendulum bearing 202 and the balance pendulum bearing 203, preventing collisions between them. The spindle block 231 also acts as a limiter; by restricting the extreme positions of the main pendulum bearing 202 and the balance pendulum bearing 203, it limits the extreme positions of the reciprocating rod 222 and the balance sleeve 223, thereby reducing the design complexity of the overall structure.

[0049] In some embodiments, reference Figure 10 as well as Figure 11 The rocker arm shaft 201 can be an integral structure, that is, the first sub-shaft 211, the second sub-shaft 221 and the shaft block 231 are integrally formed from the same base material, which is beneficial to improving the manufacturing efficiency of the rocker arm shaft 201, and can also avoid the failure of the rocker arm shaft 201 caused by the damage of the connecting parts, which is beneficial to improving the yield of the double rocker arm reciprocating mechanism 200.

[0050] In some embodiments, an angle c may be provided between the first sub-axis 211 and the second sub-axis 221 so that the balance rocker arm bearing 203 and the main rocker arm bearing 202 can move without colliding.

[0051] In some embodiments, the rocker arm shaft 201 can be manufactured using a three-axis CNC machine tool. Three-axis CNC machine tools are one of the most common types of computer numerical control machine tools. When machining the rocker arm shaft 201 using a three-axis CNC machine tool, a rotary tool that moves along the X, Y, and Z axes is used to machine the rocker arm shaft 201 workpiece. This method is cost-effective and offers high precision, making it suitable for a wide range of manufacturing applications and facilitating the commercialization and product development of the double rocker arm reciprocating mechanism 200.

[0052] During use, the rocker arm shaft 201 is usually subjected to alternating stress. In order to reduce the probability of the rocker arm shaft 201 breaking due to alternating stress, in some embodiments, the material of the rocker arm shaft 201 can have a certain toughness and good fatigue resistance. For example, the rocker arm shaft 201 can be made of high-quality carbon structural steel with a moderate carbon content.

[0053] In some embodiments, a buffer portion may be provided on the shaft block 231. The buffer portion may be located at the point where the shaft block 231 collides with the main pendulum bearing 202, or at the point where the shaft block 231 collides with the balance pendulum bearing 203. In some embodiments, the buffer portion may be made of an elastic material, which helps to reduce the impact of the main pendulum bearing 202 and / or the balance pendulum bearing 203 on the shaft block 231, thus extending the service life of the pendulum shaft 201 and consequently extending the service life of the double pendulum reciprocating mechanism 200, reducing maintenance frequency. Furthermore, the buffer portion also serves to reduce noise and vibration, decreasing the noise generated during the movement of the double pendulum reciprocating mechanism 200, and expanding the application scenarios of the double pendulum reciprocating mechanism 200.

[0054] The main swing arm bearing 202 is sleeved on the swing arm shaft 201. The outer ring of the main swing arm bearing 202 is connected to one end of the main swing arm 212, and the other end of the main swing arm 212 is connected to the reciprocating rod 222.

[0055] In some embodiments, the main rocker bearing 202 may include single-row ball rocker bearings, double-row ball rocker bearings, multi-row ball rocker bearings, single-row cylindrical roller rocker bearings, double-row cylindrical roller rocker bearings, multi-row cylindrical roller rocker bearings, and self-aligning roller rocker bearings, etc.

[0056] In some embodiments, the main pendulum rod 212 is a straight rod structure. The connection between the main pendulum rod 212 and the main pendulum rod bearing 202 is located on the line connecting the first central axis 21 and the second central axis 22. When the double pendulum reciprocating mechanism 200 performs reciprocating motion, the main pendulum rod 212 always moves in the same plane, avoiding deformation during reciprocating motion, improving the controllability of reciprocating motion, and thus improving the reciprocating balance effect of the double pendulum reciprocating mechanism 200.

[0057] When the main pendulum bearing 202 drives the main pendulum 212 to move away from the balance pendulum 213, the reciprocating rod 222 is driven by the main pendulum 212 and slides along the second central axis 22. When the main pendulum bearing 202 drives the main pendulum 212 to move closer to the balance pendulum 213, the reciprocating rod 222 is driven by the main pendulum 212 and slides along the second central axis 22.

[0058] In some embodiments, a connecting block 206 may also be provided on the main swing arm 212. The connecting block 206 is disposed on the reciprocating rod 222, and one end of the main swing arm 212 is connected to the connecting block 206. The connecting block 206 is used to connect the main swing arm 212 and the reciprocating rod 222. The connecting block 206 can be sleeved on the reciprocating rod 222. The connecting block 206 is provided with mounting holes, and one end of the main swing arm 212 is installed in the mounting holes to connect with the reciprocating rod 222.

[0059] In some embodiments, the reciprocating rod 222 may also be provided with a connecting hole that penetrates the thickness of the reciprocating rod 222, so that the reciprocating rod 222 can be combined with other transmission mechanisms, thereby broadening the application range of the double pendulum reciprocating mechanism 200.

[0060] When the rocker arm shaft 201 is driven to rotate by the motor 204, the balance rocker arm bearing 203 on the rocker arm shaft 201 moves accordingly, which in turn drives the balance rocker arm 213 to move, and the balance rocker arm 213 drives the balance sleeve 223 to reciprocate.

[0061] Figures 12 to 14 for Figure 7 The diagram shows some structural features of the balance bar bearing and balance bar. Figure 12 This is a side view schematic diagram of a balance bar bearing and a balance bar. Figure 13 This is a three-dimensional structural diagram of a balance bar bearing and a balance bar. Figure 14 This is a top view schematic diagram of the balance bar bearing and balance bar.

[0062] refer to Figure 12 as well as Figure 13 The balance rod 213 includes a bent end 23 and a straight end 24. One end of the bent end 23 is connected to the straight end 24, and the other end of the bent end 23 is connected to the outer ring of the balance rod bearing 203. To prevent the balance rod 213 from colliding with the main balance rod 212 during reciprocating motion, an angle d is provided between the centerline of the straight end 24 and the vertical centerline of the balance rod bearing 203. The range of the angle d can be between 20°±10°. It is understood that in the actual product design process, the angle d needs to be designed according to the relative positions and dimensions of the balance rod shaft 201, the main balance rod 212, the main balance rod bearing 202, the balance rod 213, the balance rod bearing 203, the reciprocating rod 222, and the balance sleeve 223, without affecting the protection of this technical solution by this patent.

[0063] refer to Figure 14 The bent rod end 23, the straight rod end 24, and the balance rod bearing 203 are located in the same plane, which makes it easy to control the movement direction of the balance rod 213 so that it does not deviate.

[0064] In some embodiments, the diameter of the bent rod end 23 can be larger than the diameter of the straight rod end 24, which helps to enhance the connection strength between the balance rod 213 and the balance rod bearing 203 and avoids breakage between the balance rod 213 and the balance rod bearing 203 due to insufficient connection strength.

[0065] In some embodiments, the balance rocker bearing 203 may include single-row ball rocker bearings, double-row ball rocker bearings, multi-row ball rocker bearings, single-row cylindrical roller rocker bearings, double-row cylindrical roller rocker bearings, multi-row cylindrical roller rocker bearings, and self-aligning roller rocker bearings, etc.

[0066] Figure 15 for Figure 7 A schematic diagram of another three-dimensional structure of the double-pendulum reciprocating mechanism.

[0067] refer to Figure 15 The balance rod bearing 203 is sleeved on the balance rod shaft 201. When the balance rod shaft 201 is driven to rotate by the motor 204, the balance rod bearing 203 is driven to move by the balance rod shaft 201, and the balance rod 213 is thus driven to move by the balance rod bearing 203. To avoid collision between the balance rod 213 and the main balance rod 212 during movement, the centerline of the straight end 24 of the balance rod 213 and the centerline of the main balance rod 212 are at an angle d. To prevent the movement trajectory of the balance rod bearing 203 from being deviated due to the influence of the angle d, the bent end 23 of the balance rod 213 is connected to the outer ring of the balance rod bearing 203, and the connection point between the bent end 23 and the outer ring is located on the line connecting the first central axis 21 and the second central axis 22. That is to say, the connection point between the bent end 23 and the outer ring is located at the intersection of the projection of the main balance rod 212 onto the balance rod bearing 203 and the outer ring of the balance rod bearing 203. Thus, during the reciprocating motion of the double pendulum reciprocating mechanism 200, the motion trajectories of the main pendulum bearing 202 and the balance pendulum bearing 203 are located on the same plane and always remain synchronized, which helps to improve the overall motion balance of the double pendulum reciprocating mechanism 200 and reduce vibration during motion.

[0068] Refer again Figure 11 The main pendulum bearing 202 and the balance pendulum bearing 203 move in sync, and the design work of the first sub-shaft 211 and the second sub-shaft 221 can be reduced without having to consider the skewness of the first sub-shaft 211 in the spatial structure. It can also effectively reduce the processing and manufacturing difficulty of the pendulum shaft 201, thereby enabling the double pendulum reciprocating mechanism 200 to be widely promoted and applied.

[0069] In some embodiments, the balancing sleeve 223 may have a large mass. When the double-pendulum reciprocating mechanism 200 reciprocates, the balancing sleeve 223 with a large mass can balance the forces on the overall mechanism.

[0070] In some embodiments, the connection between the balance sleeve 223 and the straight rod end 24 can be located at the end of the balance sleeve 223 away from the second sliding sleeve 215, which helps to increase the range of motion of the balance pendulum 213, increase the sliding distance of the balance sleeve 223, optimize the center of gravity of the double pendulum reciprocating mechanism 200, reduce the vibration of the reciprocating rod 222 caused by uneven force at both ends, and thus further improve the reciprocating balance of the double pendulum reciprocating mechanism 200.

[0071] In some embodiments, the double-rocker reciprocating mechanism 200 may further include a connecting sleeve 207, which can be connected to the second sliding sleeve 215. Other external transmission mechanisms and / or fixing mechanisms can be combined with the double-rocker reciprocating mechanism 200 by connecting to the connecting sleeve 207, thereby achieving more functions. The connecting sleeve 207 may be provided with connecting structures such as screw holes, connecting guide rods, or gears for connection. The double-rocker reciprocating mechanism 200 can be linked with other mechanisms by combining nuts and screw holes, clamps and connecting guide rods, or gears.

[0072] The motion mode of the double pendulum reciprocating mechanism 200 will be explained below.

[0073] The motor 204 can directly drive the pendulum shaft 201 to rotate around the first central axis 21. The motor 204 can also drive the pendulum shaft 201 to rotate around the first central axis 21 via a transmission mechanism. When the pendulum shaft 201 rotates around the first central axis 21, the main pendulum bearing 202 and the balance pendulum bearing 203 on the pendulum shaft 201 are also driven to move accordingly. The balance pendulum bearing 203 is sleeved on the first sub-shaft 211 of the pendulum shaft 201, and the main pendulum bearing 202 is sleeved on the second sub-shaft 221 of the pendulum shaft 201. A shaft center block 231 is provided between the first sub-shaft 211 and the second sub-shaft 221 to prevent collision between the main pendulum bearing 202 and the balance pendulum bearing 203. The first sub-shaft 211, the second sub-shaft 221, and the shaft center block 231 are all located on the same plane, and the movement trajectories of the main pendulum bearing 202 and the balance pendulum bearing 203 are also on the same plane, which is beneficial for optimizing the reciprocating balance design of the double pendulum reciprocating mechanism 200. An angle c is provided between the first sub-axis 211 and the second sub-axis 221. When the pendulum shaft 201 rotates around the first central axis 21, the balance pendulum bearing 203 and the main pendulum bearing 202 reciprocate up and down in a plane in space. The balance pendulum 213 connected to the balance pendulum bearing 203 also reciprocates up and down accordingly, and the main pendulum 212 connected to the main pendulum bearing 202 also reciprocates up and down accordingly. The main pendulum 212 is connected to the reciprocating rod 222, and the direction of movement of the reciprocating rod 222 is along the second central axis 22. When the main pendulum 212 is driven by the main pendulum bearing 202, the reciprocating rod 222 slides back and forth along the second central axis 22. The balance pendulum 213 is connected to the balance sleeve 223, which is fitted onto the reciprocating rod 222, and the direction of movement of the balance sleeve 223 is also along the second central axis 22. When the balance rod 213 is driven by the balance rod bearing 203, the balance sleeve 223 reciprocates along the second central axis 22. Furthermore, due to the presence of angle c, the direction of motion of the reciprocating rod 222 is opposite to the direction of motion of the balance sleeve 223.

[0074] A balance sleeve 223 is disposed between a first sliding sleeve 205 and a second sliding sleeve 215, and a reciprocating rod 222 passes through the second sliding sleeve 215. The first sliding sleeve 205 and the second sliding sleeve 215 can be connected to the housing. The cavities of the first sliding pin hole 225 on the first sliding sleeve 205, the third sliding pin hole 233 on the balance sleeve 223, and the second sliding pin hole 235 on the second sliding sleeve 215 are aligned. A sliding pin passes through the first sliding pin hole 225, the third sliding pin hole 233, and the second sliding pin hole 235, and the balance sleeve 235 slides on the sliding pin. When the reciprocating rod 222 slides away from the first sliding sleeve 205 and the second sliding sleeve 215, the balance sleeve 223 slides away from the second sliding sleeve 215 on the sliding pin until the balance sleeve 223 abuts against the first sliding sleeve 205. At this point, both the reciprocating rod 222 and the balance sleeve 223 are at their extreme positions. As the reciprocating rod 222 slides towards the first sliding sleeve 205 and the second sliding sleeve 215, the balance sleeve 223 slides on the sliding pin towards the second sliding sleeve 215 until the balance sleeve 223 abuts against the end of the main swing rod 212. At this point, both the reciprocating rod 222 and the balance sleeve 223 are at another extreme position. Through the continuous rotation of the swing rod shaft 201, the balance sleeve 223 and the reciprocating rod 222 continuously reciprocate between the two extreme positions, thereby realizing the reciprocating motion of the entire double swing rod reciprocating mechanism 200.

[0075] The double-pendulum reciprocating mechanism 200 provided in the above-disclosed embodiments includes a pendulum shaft 201 and a motor 204. The pendulum shaft 201 has a first central axis 21, and the motor 204 is connected to the pendulum shaft 201, providing power for the pendulum shaft 201 to rotate around the first central axis 21. The double-pendulum reciprocating mechanism 200 also includes a main pendulum bearing 202, a main pendulum 212, and a reciprocating rod 222. The reciprocating rod 222 has a second central axis 22, and the first central axis 21 is parallel to the second central axis 22. When the double-pendulum reciprocating mechanism 200 performs reciprocating motion, the reciprocating rod 222 reciprocates along the second central axis 22. The reciprocating rod 222 is connected to one end of the main pendulum rod 212, and the other end of the main pendulum rod 212 is connected to the outer ring of the main pendulum rod bearing 202. The main pendulum rod bearing 202 is sleeved on the pendulum rod shaft 201, and the movement of the pendulum rod shaft 201 is transmitted to the reciprocating rod 222 through the main pendulum rod bearing 202 and the main pendulum rod 212. The double pendulum reciprocating mechanism 200 also includes a balance pendulum rod bearing 203, a balance pendulum rod 213, and a balance sleeve 223. When the double pendulum reciprocating mechanism 200 performs reciprocating motion, the balance sleeve 223 performs reciprocating motion along the second central axis 22, and the direction of motion of the balance sleeve 223 is opposite to the direction of motion of the reciprocating rod 222, so as to maintain the stability of the center of gravity of the double pendulum reciprocating mechanism 200, avoid the vibration or even tilting of the double pendulum reciprocating mechanism 200, and thus achieve the mechanical balance of the overall structure in reciprocating motion. The balance rod 213 includes a bent end 23 and a straight end 24. The balance sleeve 223 is connected to the straight end 24, and the bent end 23 is connected to the outer ring of the balance rod bearing 203. The connection between the bent end 23 and the balance rod bearing 203 is located on the line connecting the first central axis 21 and the second central axis 22, which helps to improve the mechanical stability of the overall structure and further improves the balance effect of the double-rocker reciprocating mechanism 200. The balance rod bearing 203 is sleeved on the rocker shaft 201, and the movement of the rocker shaft 201 is transmitted to the balance sleeve 223 through the balance rod bearing 203 and the balance rod 213. In this mechanism, motor 204 drives the pendulum shaft 201 to rotate around the first central axis; main pendulum bearing 202 drives the main pendulum 212 to move along a direction parallel to the second central axis 22; balance pendulum bearing 203 drives the balance pendulum 213 to move along a direction parallel to the second central axis 22; reciprocating rod 222 moves along the second central axis 22 in the same direction as the main pendulum 212; and balance sleeve 223 moves along the second central axis 22 in the same direction as the balance pendulum 213. The double pendulum reciprocating mechanism 200 exhibits good overall mechanical stability, achieving motion balance during reciprocating motion, further reducing vibration, which helps alleviate wear and increase the mechanism's service life. Furthermore, its simple structure and low manufacturing cost facilitate large-scale application.

[0076] Accordingly, another embodiment of this disclosure also provides a power tool, which includes the double-swing lever reciprocating mechanism 200 provided in the foregoing embodiment. The power tool provided in another embodiment of this disclosure will be described in detail below. For parts that are the same as or corresponding to the previous embodiment, please refer to the corresponding descriptions in the foregoing embodiments; they will not be repeated in detail below.

[0077] Power tools can include electric reciprocating saws, fascia guns, shearing machines, punch presses, sawing machines, and engines. By installing and combining the double-rocker reciprocating mechanism 200 with other structures within the power tool, the reciprocating motion of the double-rocker reciprocating mechanism 200 can be transmitted to other structures, such as saw blades, massage balls, shearing blades, stamping structures, and piston structures, thereby achieving a wide variety of applications.

[0078] The power tool provided in the above-disclosed embodiments includes the double-swing arm reciprocating mechanism 200 provided in the aforementioned embodiments. In the double-swing arm reciprocating mechanism 200, the cooperation between the main swing arm 212 and the balance swing arm 213 improves the mechanical stability of the double-swing arm reciprocating mechanism 200. During reciprocating motion, the vibration generated by the double-swing arm reciprocating mechanism 200 is smaller, the degree of collision is less, and the degree of wear is lower, resulting in a longer service life for the power tool and good economic efficiency. Furthermore, in the double-swing arm reciprocating mechanism 200, the connection between the bent end 23 of the balance swing arm 213 and the balance swing arm bearing 203 is located on the line connecting the first central axis 21 and the second central axis 22, which effectively optimizes the overall structure of the double-swing arm reciprocating mechanism 200, reduces the manufacturing difficulty of parts, and helps to reduce the cost of the power tool, thereby promoting the productization and commercialization of the power tool.

[0079] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of this disclosure. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this disclosure; therefore, the scope of protection of this disclosure should be determined by the scope defined in the claims.

Claims

1. A double-pendulum reciprocating mechanism, characterized in that, include: A rocker arm shaft, the rocker arm shaft having a first central axis; The system includes a main pendulum bearing, a main pendulum rod, and a reciprocating rod. The main pendulum bearing is sleeved on the pendulum rod shaft. One end of the main pendulum rod is connected to the outer ring of the main pendulum bearing, and another end of the main pendulum rod is connected to the reciprocating rod. The reciprocating rod has a second central axis, and the first central axis is parallel to the second central axis. The system includes a balance rod bearing, a balance rod, and a balance sleeve. The balance rod bearing is sleeved on the balance rod shaft. The balance rod includes a bent end and a straight end. The bent end is connected to the outer ring of the balance rod bearing, and the connection between the bent end and the balance rod bearing is located on the line connecting the first central axis and the second central axis. The straight end is connected to the balance sleeve, and the balance sleeve is sleeved on the reciprocating rod. The centerline of the straight end of the balance rod is set at an angle to the centerline of the main rod. A motor is connected to the swing arm shaft, and the motor is used to drive the swing arm shaft to rotate about the first central axis; Specifically, the motor drives the pendulum shaft to rotate around the first central axis; the main pendulum bearing drives the main pendulum to move in a direction parallel to the second central axis; the balance pendulum bearing drives the balance pendulum to move in a direction parallel to the second central axis, and the movement direction of the main pendulum is opposite to that of the balance pendulum; the reciprocating rod moves along the second central axis, and the movement direction of the reciprocating rod is the same as that of the main pendulum; the balance sleeve moves along the second central axis, and the movement direction of the balance sleeve is the same as that of the balance pendulum.

2. The double-pendulum reciprocating mechanism according to claim 1, characterized in that, The double-rocker reciprocating mechanism also includes: A first sliding sleeve and a second sliding sleeve are disposed opposite to each other, and the reciprocating rod passes through the first sliding sleeve and the second sliding sleeve, and the reciprocating rod can slide between the first sliding sleeve and the second sliding sleeve.

3. The double-pendulum reciprocating mechanism according to claim 2, characterized in that, The first sliding sleeve is provided with a first sliding pin hole, and the second sliding sleeve is provided with a second sliding pin hole, wherein the cavity of the first sliding pin hole is aligned with the cavity of the second sliding pin hole.

4. The double-pendulum reciprocating mechanism according to claim 3, characterized in that, The balance sleeve is provided with a third sliding pin hole, and the cavity of the third sliding pin hole is aligned with the cavity of the first sliding pin hole, and the cavity of the third sliding pin hole is aligned with the cavity of the second sliding pin hole.

5. The double-pendulum reciprocating mechanism according to claim 1, characterized in that, The double-pendulum reciprocating mechanism also includes a connecting block, which is disposed on the reciprocating rod, and one end of the main pendulum rod is connected to the connecting block.

6. The double-pendulum reciprocating mechanism according to claim 1, characterized in that, The pendulum shaft includes a first sub-shaft, a second sub-shaft, and a central block. The first sub-shaft and the second sub-shaft are symmetrically arranged on both sides of the central block. The diameter of the central block is larger than the diameter of the first sub-shaft, and the diameter of the central block is larger than the diameter of the second sub-shaft. The balance pendulum bearing is sleeved on the first sub-shaft, and the main pendulum bearing is sleeved on the second sub-shaft.

7. The double-pendulum reciprocating mechanism according to claim 2, characterized in that, The double-swing reciprocating mechanism also includes a connecting sleeve, which is connected to the second sliding sleeve.

8. The double-pendulum reciprocating mechanism according to claim 1, characterized in that, The balance rocker bearing includes a multi-row ball rocker bearing.

9. The double-pendulum reciprocating mechanism according to claim 1, characterized in that, The main rocker arm bearing includes multiple rows of ball rocker arm bearings.

10. A power tool, characterized in that, Includes the double pendulum reciprocating mechanism as described in any one of claims 1 to 7.

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