A composite gear transmission rocker arm mechanism

Abstract

This invention relates to the field of rocker arm mechanisms, specifically to a composite gear-driven rocker arm mechanism, comprising a housing, a rocker arm, a turntable, and an auxiliary device. A needle roller is disposed on the side of the turntable near the rocker arm. A rocker arm groove is provided on the rocker arm; the groove is a straight opening along the length of the rocker arm. The auxiliary device is disposed between the side wall of the needle roller and the groove wall of the rocker arm groove, comprising two sets of rollers symmetrically arranged vertically. The roller axes are inclined along a second direction. The end of the needle roller near the rocker arm is inserted into the rocker arm groove. As the needle roller moves within the groove, it sequentially abuts against the rollers, driving the rollers to rotate around their own axes. This changes the movement of the needle roller from sliding to rolling, reducing wear during movement. Furthermore, the inclined arrangement of the rollers allows the needle roller to simultaneously abut against multiple rollers, improving the stability of the needle roller's movement within the groove.

Description

Technical Field

[0001] This invention relates to the field of rocker arm mechanisms, and more specifically to a compound gear-driven rocker arm mechanism. Background Technology

[0002] A pendulum mechanism is a mechanical structure that typically includes a rotatable rod called a pendulum. One end of the pendulum is rotatably connected to a fixed point, and the other end is connected to a kinematic pair. When the pendulum rotates around the fixed point, the other end connected to the kinematic pair performs a reciprocating motion. Pendulum mechanisms are widely used in various mechanical devices. The working principle of a pendulum mechanism is based on the conversion between rotational and translational motion. When the pendulum rotates on one side, its other side, due to constraint, can only perform linear motion; this is called oscillation. The design of a pendulum mechanism depends on its application; different designs can achieve different functions and effects.

[0003] In the prior art, such as the Chinese patent with publication number CN115059744A entitled "A Swinging Mechanism Driven by a Worm Gear," the disclosed technical solution describes that a motor directly drives the worm, which in turn drives the worm wheel to rotate. The stop block on the worm wheel then moves within the X-axis frame groove, driving the X-axis frame to reciprocate. However, when the stop block moves within the X-axis frame groove, sliding friction between the stop block and the groove is unavoidable, potentially leading to excessive wear and affecting the transmission accuracy of the swing mechanism. Summary of the Invention

[0004] This invention provides a composite gear-driven rocker arm mechanism to solve the above-mentioned problems.

[0005] The present invention provides a composite gear transmission rocker arm mechanism, which adopts the following technical solution: A composite gear transmission rocker arm mechanism includes a housing, a rocker arm, a turntable, and an auxiliary device.

[0006] The housing has a first direction and a second direction. The first direction and the second direction are mutually perpendicular horizontal directions.

[0007] The swing rod is positioned along a first direction, with one end designated as a rotating end and the other as a swinging end. The rotating end of the swing rod is rotatably mounted on the housing via a pivot shaft positioned along a second direction, while the other end extends out of the housing. The swing rod has a swing groove. The swing groove is a straight opening positioned along the length of the swing rod. The groove wall comprises two arc segments and two straight segments. The two straight segments are distributed vertically. The two arc segments are distributed along the first direction at both ends of the straight segments.

[0008] A turntable is located on one side of the swing arm. The turntable's axis is set along a second direction. The turntable is rotatably mounted inside the housing. A needle roller is provided on the side of the turntable near the swing arm. The needle roller is set along the second direction. One end of the needle roller near the turntable is eccentrically fixed to the turntable, and the other end of the needle roller near the swing arm is inserted into the swing groove.

[0009] The auxiliary device includes two sets of rollers symmetrically arranged vertically. Each set has multiple rollers, distributed along a first direction. The rollers are rotatably mounted on the wall of the swing groove via a mounting assembly. The mounting assembly includes a mounting plate, which is positioned along the first direction. The mounting plate is fixed to a straight section of the wall of the swing groove with screws. Multiple mounting slots are formed on the mounting plate. The rollers are rotatably mounted within these slots. The rollers abut against the needle rollers. The roller axes are inclined along a second direction, and the angle between the projection of the roller axis onto the horizontal plane and the needle roller axis is acute. As the needle rollers move within the swing groove, they sequentially abut against the rollers, driving the rollers to rotate around their own axes. This changes the movement of the needle rollers from sliding to rolling, reducing wear during movement. Furthermore, the inclined arrangement of the rollers allows the needle rollers to abut against multiple rollers simultaneously, improving the stability of the needle rollers' movement within the swing groove. Two auxiliary devices are symmetrically arranged about the first direction. The projection of the mounting plate onto the vertical plane extending along the second direction forms a V-shape with the smaller end facing the center line of the swing groove, causing the rollers to tilt vertically and ensuring that the projections of the rollers of the two auxiliary devices onto the vertical plane extending along the second direction also form a V-shape with the smaller end facing the center line of the swing groove. A limiting groove is provided at the end of the needle roller near the swing rod. The cross-section of the limiting groove is V-shaped with the smaller end facing the axis of the needle roller. The limiting groove and the mounting plate of the swing groove are compatible. The projection of the mounting plate onto the vertical plane extending along the second direction forms a V-shape with the smaller end facing the center line of the swing groove, extending the length of the roller to increase the number of rollers simultaneously contacting the needle roller, making the movement of the needle roller more stable. Simultaneously, the V-shaped limiting groove and the V-shaped mounting plate of the swing groove cooperate to limit the movement of the needle roller, preventing offset in the second direction during needle roller swing. The roller is frustum-shaped. The smaller end of the roller faces the center line of the swing groove, so that the smaller end of the roller abuts against the smaller end of the limiting groove, and the larger end of the roller abuts against the larger end of the limiting groove. Surface contact is formed at the contact point between the needle roller and the roller due to deformation. When the turntable drives the needle roller to rotate around its axis, the linear velocity at the small end of the needle roller's limiting groove is less than the linear velocity at the large end of the limiting groove. When the needle roller drives the roller to rotate around its own axis, the frustum-shaped roller matches the linear velocity at the large end of the roller with that at the large end of the limiting groove, and also matches the linear velocity at the small end of the roller with that at the small end of the limiting groove, thereby reducing relative slippage between the needle roller and the roller.

[0010] Furthermore, while ensuring contact between the needle roller and multiple rollers, the angle between the projection of the roller axis on the horizontal plane and the needle roller axis gradually decreases from the middle to the ends of the swing groove. As the turntable drives the needle roller to rotate around its axis, causing the swing arm to swing up and down, when the swing arm rotates upwards or downwards from the midpoint of its maximum vertical swing distance at the swing end and the line connecting the rotating end of the swing arm, the needle roller moves from the middle to the ends of the swing groove. During this process, the pressure between the needle roller and the roller gradually increases. Therefore, as the angle between the projection of the roller axis on the horizontal plane and the needle roller axis gradually decreases from the middle to the ends of the swing groove, the surface contact area generated by the pressure deformation at the contact point between the needle roller and the roller gradually increases, improving the stability of the swing arm during its swing.

[0011] Furthermore, the mounting assembly also includes an extension plate. The extension plate is arc-shaped. It is fixed to the arc-shaped segment of the swing groove wall with screws. The extension plate has a V-shaped cross-section with the smaller end facing the center line of the swing groove. The end face of the extension plate near the center line of the swing groove is tangent to the adjacent roller on the mounting plate. This allows the needle rollers to smoothly transition from the rollers to the extension plate when they move to both ends of the swing groove, improving the stability of the swing arm during its swing.

[0012] Furthermore, a rotating hole is provided within the mounting groove. A positioning hole is provided at the roller axis. Two positioning rods are provided within the positioning hole. The positioning rods are slidably installed in the positioning hole. A mounting spring connects the two positioning rods. The mounting spring causes one end of the positioning rod to extend out of the positioning hole. The positioning rod and the rotating hole are in rotational engagement. When installing the roller into the mounting groove, a thin plate or other tool is used to press down on the positioning rod, compressing the mounting spring and pressing the positioning rod into the positioning hole. After the roller enters the mounting groove, the thin plate is removed, causing the mounting spring to release its force, pushing one end of the positioning rod into the rotating hole.

[0013] Furthermore, a compound gear transmission rocker arm mechanism also includes a drive unit. The drive unit is used to drive the turntable to rotate the needle rollers.

[0014] Furthermore, the drive device includes a worm gear and a gear transmission assembly. The worm gear axis is arranged along a first direction. The worm gear is rotatably mounted within a housing. A motor is connected to one end of the worm gear. A worm wheel is located below the worm gear. The worm wheel axis is arranged along a second direction. The worm wheel is rotatably mounted within the housing. The worm wheel and worm gear mesh for transmission. The worm wheel and worm gear transmission achieves speed reduction, torque increase, and self-locking functions. The gear transmission assembly is used to drive the turntable to rotate when the motor drives the worm gear to rotate, and the worm gear drives the worm wheel to rotate.

[0015] Furthermore, the gear transmission assembly includes a large gear and a small gear. The small gear is coaxially fixed to the worm gear. The large gear is coaxially fixed to the turntable. The diameter of the large gear is larger than that of the small gear. The large gear and the small gear mesh to drive the transmission. The meshing transmission of the large gear and the small gear increases the output torque.

[0016] The beneficial effects of this invention are:

[0017] 1. As the needle roller moves within the swing groove, it sequentially contacts and abuts against the rollers, causing the rollers to rotate around their own axes. This changes the movement of the needle roller from sliding to rolling, reducing wear during movement. Furthermore, the inclined design of the rollers allows the needle roller to contact multiple rollers simultaneously, improving the stability of its movement within the swing groove.

[0018] 2. The projection of the mounting plate on the vertical plane extending along the second direction is a V-shape with the small end facing the center line of the swing groove, which extends the length of the roller to increase the number of rollers that simultaneously abut against the needle roller, making the movement of the needle roller more stable. At the same time, the V-shaped limiting groove and the V-shaped mounting plate of the swing groove cooperate to limit the needle roller and prevent the needle roller from deviating in the second direction. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an embodiment of a composite gear transmission rocker arm mechanism according to the present invention;

[0021] Figure 2 This is a schematic diagram from another angle of an embodiment of a composite gear transmission rocker arm mechanism according to the present invention;

[0022] Figure 3 This is a schematic diagram of the interior of an embodiment of a composite gear transmission rocker arm mechanism according to the present invention;

[0023] Figure 4 This is a schematic diagram of the interior from another angle of an embodiment of the composite gear transmission rocker arm mechanism of the present invention;

[0024] Figure 5 This is an exploded view of an embodiment of a composite gear transmission rocker arm mechanism according to the present invention;

[0025] Figure 6 This is a schematic diagram of the needle roller, swing rod, and roller in an embodiment of a composite gear transmission rocker arm mechanism of the present invention;

[0026] Figure 7 This is a front view of the needle roller, swing rod, and roller in an embodiment of a composite gear transmission rocker arm mechanism of the present invention.

[0027] Figure 8 for Figure 7 Sectional view at point AA;

[0028] Figure 9 for Figure 7 Sectional view at point BB;

[0029] Figure 10 This is a schematic diagram of the interior of a roller in an embodiment of a composite gear transmission rocker arm mechanism of the present invention;

[0030] Figure 11 This is a schematic diagram of the mounting plate of an embodiment of a composite gear transmission rocker arm mechanism according to the present invention.

[0031] In the diagram: 100, housing; 200, swing rod; 210, swing groove; 300, turntable; 310, needle roller; 400, mounting plate; 410, mounting groove; 420, supplementary plate; 500, roller; 510, positioning rod; 520, mounting spring; 610, worm gear; 620, worm wheel; 630, large gear; 640, small gear. Detailed Implementation

[0032] Embodiments of the present invention will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] The terms "first" and "second" in the specification and claims of this invention may explicitly or implicitly include one or more of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this invention, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," 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 this invention and simplifying the description, and do not 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 this invention.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] An embodiment of the composite gear transmission rocker arm mechanism of the present invention is as follows: Figures 1 to 11 As shown: A composite gear transmission rocker arm mechanism includes a housing 100, a rocker arm 200, a turntable 300, an auxiliary device, and a drive device.

[0037] The housing 100 has a first direction and a second direction. The first direction and the second direction are horizontal directions that are perpendicular to each other.

[0038] The swing rod 200 is arranged along a first direction, with one end as a rotating end and the other end as a swinging end. The rotating end of the swing rod 200 is rotatably mounted on the housing 100 via a pivot arranged along a second direction, and the other end extends out of the housing 100. The swing rod 200 is provided with a swing groove 210. The swing groove 210 is a straight groove arranged along the length direction of the swing rod 200. The groove wall of the swing groove 210 includes two arc segments and two straight segments. The two straight segments are distributed vertically. The two arc segments are distributed at both ends of the straight segments along the first direction.

[0039] A turntable 300 is located on one side of the swing arm 200. The axis of the turntable 300 is set along a second direction. The turntable 300 is rotatably mounted inside the housing 100. A needle roller 310 is provided on the side of the turntable 300 near the swing arm 200. The needle roller 310 is set along the second direction. One end of the needle roller 310 near the turntable 300 is eccentrically fixed to the turntable 300, and the other end of the needle roller 310 near the swing arm 200 is inserted into the swing groove 210.

[0040] Two auxiliary devices are symmetrically arranged about the first direction. Each auxiliary device includes two sets of rollers 500 arranged symmetrically vertically. Each set of rollers 500 has multiple rollers 500, distributed along the first direction. The rollers 500 are rotatably mounted on the wall of the swing groove 210 via a mounting assembly. The mounting assembly includes a mounting plate 400 and a supplementary plate 420. The mounting plate 400 is arranged along the first direction. The mounting plate 400 is fixed to a straight section of the wall of the swing groove 210 by screws. Multiple mounting slots 410 are formed on the mounting plate 400. The rollers 500 are rotatably mounted within the mounting slots 410. The supplementary plate 420 is arc-shaped. The supplementary plate 420 is fixed to the arc-shaped section of the wall of the swing groove 210 by screws. The cross-section of the supplementary plate 420 is V-shaped, with the smaller end facing the centerline of the swing groove 210. The end face of the supplementary plate 420 near the centerline of the swing groove 210 is tangent to the adjacent roller 500 on the mounting plate 400. To ensure a smooth transition from the roller 500 to the supplementary plate 420 when the needle roller 310 moves to both ends of the swing groove 210, the stability of the swing rod 200 during swing is improved. A rotating hole is provided in the mounting groove 410. A positioning hole is provided at the axis of the roller 500. Two positioning rods 510 are provided in the positioning hole. The positioning rods 510 are slidably installed in the positioning hole. A mounting spring 520 connects the two positioning rods 510. The mounting spring 520 causes one end of the positioning rod 510 to extend out of the positioning hole. The positioning rod 510 and the rotating hole are rotatably engaged. When the roller 500 is installed into the mounting groove 410, a thin plate or other tool is used to press the positioning rod 510, compressing the mounting spring 520 and pressing the positioning rod 510 into the positioning hole. After the roller 500 enters the mounting groove 410, the thin plate is removed, causing the mounting spring 520 to release its force, pushing one end of the positioning rod 510 into the rotating hole.

[0041] Roller 500 and needle roller 310 abut against each other. The axis of roller 500 is inclined along the second direction, and the angle between the projection of the axis of roller 500 on the horizontal plane and the axis of needle roller 310 is an acute angle. When needle roller 310 moves within the swing groove 210, it abuts against roller 500 in sequence, driving roller 500 to rotate around its own axis, thus changing the movement mode of needle roller 310 from sliding to rolling, reducing wear on needle roller 310 during movement. Furthermore, the inclined arrangement of roller 500 allows needle roller 310 to abut against multiple rollers 500 simultaneously, improving the stability of needle roller 310's movement within the swing groove 210.

[0042] The projection of the mounting plate 400 onto the vertical plane extending along the second direction forms a V-shape with the smaller end facing the center line of the swing groove 210, causing the roller 500 to tilt vertically and the projections of the rollers 500 of the two auxiliary devices onto the vertical plane extending along the second direction also form a V-shape with the smaller end facing the center line of the swing groove 210. A limiting groove is provided at one end of the needle roller 310 near the swing rod 200. The cross-section of the limiting groove is V-shaped with the smaller end facing the axis of the needle roller 310. The limiting groove and the mounting plate 400 of the swing groove 210 are compatible. The projection of the mounting plate 400 onto the vertical plane extending along the second direction forms a V-shape with its smaller end facing the center line of the swing groove 210. This extends the length of the roller 500, increasing the number of rollers 500 simultaneously contacting the needle roller 310, thus making the movement of the needle roller 310 more stable. Simultaneously, the V-shaped limiting groove and the V-shaped mounting plate 400 of the swing groove 210 cooperate to limit the movement of the needle roller 310, preventing it from shifting in the second direction during swing. The roller 500 is frustum-shaped. The smaller end of the roller 500 faces the center line of the swing groove 210, so that the smaller end of the roller 500 contacts the smaller end of the limiting groove, and the larger end of the roller 500 contacts the larger end of the limiting groove. A surface contact is formed at the contact point between the needle roller 310 and the roller 500 due to a certain deformation. When the turntable 300 drives the needle roller 310 to rotate around the axis of the turntable 300, the linear velocity at the small end of the limiting groove of the needle roller 310 is less than the linear velocity at the large end of the limiting groove. When the needle roller 310 drives the roller 500 to rotate around its own axis, the frustum-shaped roller 500 matches the linear velocity at the large end of the roller 500 with the linear velocity at the large end of the limiting groove, and also matches the linear velocity at the small end of the roller 500 with the linear velocity at the small end of the limiting groove, thereby reducing the relative slippage between the needle roller 310 and the roller 500.

[0043] While ensuring that the needle roller 310 is in contact with the multiple rollers 500, the angle between the projection of the axis of the roller 500 on the horizontal plane and the axis of the needle roller 310 gradually decreases from the middle of the swing groove 210 to both ends of the swing groove 210. During the process of the turntable 300 driving the needle roller 310 to rotate around the axis of the turntable 300 to drive the swing rod 200 to swing up and down, when the swing rod 200 rotates upward or downward from the midpoint of the maximum distance of the swing from the swing end of the swing rod 200 and the line connecting the rotating end of the swing rod 200, the needle roller 310 moves from the middle of the swing groove 210 to both ends of the swing groove 210, and during this process, the pressure between the needle roller 310 and the rollers 500 gradually increases. As the angle between the projection of the roller 500 axis on the horizontal plane and the axis of the needle roller 310 gradually decreases from the middle of the swing groove 210 to both ends of the swing groove 210, the surface contact area generated by the pressure deformation at the contact point between the needle roller 310 and the roller 500 gradually increases, thereby improving the stability of the swing rod 200 during the swing process.

[0044] The drive unit is used to drive the turntable 300 to rotate the needle roller 310. The drive unit includes a worm 610 and a gear transmission assembly. The axis of the worm 610 is set along a first direction. The worm 610 is rotatably mounted inside the housing 100. One end of the worm 610 is connected to a motor. A worm wheel 620 is provided below the worm 610. The axis of the worm wheel 620 is set along a second direction. The worm wheel 620 is rotatably mounted inside the housing 100. The worm wheel 620 and the worm 610 mesh and transmit power. The worm wheel 620 and worm 610 transmission realizes the functions of speed reduction, torque increase and self-locking. The gear transmission assembly is used to drive the turntable 300 to rotate when the motor drives the worm 610 to rotate, and the worm 610 drives the worm wheel 620 to rotate. The gear transmission assembly includes a large gear 630 and a small gear 640. The small gear 640 is coaxially fixed on the worm wheel 620. The large gear 630 is coaxially fixed on the turntable 300. The diameter of the large gear 630 is larger than that of the small gear 640. The large gear 630 and the small gear 640 mesh together for transmission. The meshing transmission of the large gear 630 and the small gear 640 increases the output torque.

[0045] Based on the above embodiments, the operating principle and process of this invention are as follows: In use, the motor drives the worm gear 610 to rotate, the worm gear 610 drives the worm wheel 620 to rotate, the worm wheel 620 drives the pinion gear 640 to rotate, the pinion gear 640 drives the large gear 630 to rotate, and the large gear 630 drives the turntable 300 to rotate. The turntable 300 drives the needle roller 310 to rotate around the axis of the turntable 300, causing the needle roller 310 to reciprocate within the swing groove 210. When the needle roller 310 moves within the swing groove 210, it successively abuts against the rollers 500 and drives the rollers 500 to rotate around their own axes, changing the movement mode of the needle roller 310 from sliding to rolling, reducing the wear of the needle roller 310 during movement. Furthermore, the inclined arrangement of the rollers 500 allows the needle roller 310 to abut against multiple rollers 500 simultaneously, improving the stability of the needle roller 310's movement within the swing groove 210.

[0046] The projection of the mounting plate 400 on the vertical plane extending along the second direction is a V-shape with the smaller end facing the center line of the swing groove 210, which extends the length of the roller 500 to increase the number of rollers 500 that simultaneously abut against the needle roller 310, making the movement of the needle roller 310 more stable. At the same time, the V-shaped limiting groove and the V-shaped mounting plate 400 of the swing groove 210 cooperate to limit the needle roller 310 and prevent the needle roller 310 from deviating in the second direction when swinging.

[0047] Surface contact is formed at the contact point between the needle roller 310 and the roller 500 due to a certain deformation. When the turntable 300 drives the needle roller 310 to rotate around its axis, the linear velocity at the small end of the limiting groove of the needle roller 310 is less than the linear velocity at the large end of the limiting groove. When the needle roller 310 drives the roller 500 to rotate around its own axis, the frustum-shaped roller 500 matches the linear velocity at its large end with that at the large end of the limiting groove, and also matches the linear velocity at its small end with that at the small end of the limiting groove, thereby reducing the relative slippage between the needle roller 310 and the roller 500.

[0048] During the process of the turntable 300 driving the needle roller 310 to rotate around the axis of the turntable 300, thereby driving the swing rod 200 to swing up and down, when the swing rod 200 rotates upward or downward from the midpoint of the maximum vertical distance of the swinging end of the swing rod 200 and the line connecting the rotating end of the swing rod 200, the needle roller 310 moves from the middle of the swing groove 210 to both ends of the swing groove 210. During this process, the pressure between the needle roller 310 and the roller 500 gradually increases. As the angle between the projection of the axis of the roller 500 on the horizontal plane and the axis of the needle roller 310 gradually decreases from the middle of the swing groove 210 to both ends of the swing groove 210, the surface contact area generated by the pressure deformation at the contact point between the needle roller 310 and the roller 500 gradually increases, thereby improving the stability of the swing rod 200 during the swinging process.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite gear-driven rocker arm mechanism, characterized in that: Includes housing, swing arm, turntable, and auxiliary devices; The housing has a first direction and a second direction; the first direction and the second direction are mutually perpendicular horizontal directions. The swing rod is set along a first direction, with one end as a rotating end and the other end as a swinging end; the rotating end of the swing rod is rotatably mounted on the housing via a rotating shaft set along a second direction, and the other end extends out of the housing; the swing rod is provided with a swing groove; the swing groove is a straight groove set along the length of the swing rod; the groove wall of the swing groove includes two arc segments and two straight segments; the two straight segments are distributed vertically; the two arc segments are distributed at both ends of the straight segments along the first direction; The turntable is located on one side of the swing arm; the axis of the turntable is set along the second direction; the turntable is rotatably installed in the housing; a needle roller is provided on the side of the turntable near the swing arm; the needle roller is set along the second direction; one end of the needle roller near the turntable is eccentrically fixed on the turntable, and the other end of the needle roller near the swing arm is inserted into the swing groove. The auxiliary device includes two sets of rollers symmetrically arranged vertically; each set has multiple rollers, distributed along a first direction; the rollers are rotatably mounted on the wall of the swing groove via a mounting assembly; the mounting assembly includes a mounting plate; the mounting plate is arranged along the first direction; the mounting plate is fixed to a straight section of the wall of the swing groove by screws; the mounting plate has multiple mounting slots; the rollers are rotatably mounted in the mounting slots; the rollers and needle rollers abut against each other; the roller axes are inclined along a second direction, and the angle between the projection of the roller axis on the horizontal plane and the needle roller axis is an acute angle; the auxiliary device is symmetrically arranged about the first direction. There are two; the projection of the mounting plate on the vertical plane extending along the second direction is a V-shape with the small end facing the center line of the swing groove, so that the rollers are tilted up and down, and the projection of the rollers of the two auxiliary devices on the vertical plane extending along the second direction is a V-shape with the small end facing the center line of the swing groove; a limiting groove is provided at one end of the needle roller near the swing rod; the cross section of the limiting groove is a V-shape with the small end facing the axis of the needle roller; the limiting groove and the mounting plate of the swing groove are compatible; the roller is frustum-shaped; the small end of the roller faces the center line of the swing groove, so that the small end of the roller abuts against the small end of the limiting groove, and the large end of the roller abuts against the large end of the limiting groove.

2. The composite gear transmission rocker arm mechanism according to claim 1, characterized in that: While ensuring that the needle roller is in contact with multiple rollers, the angle between the projection of the roller axis on the horizontal plane and the needle roller axis gradually decreases from the middle of the swing groove to both ends of the swing groove.

3. The composite gear transmission rocker arm mechanism according to claim 2, characterized in that: The mounting assembly also includes an extension plate; the extension plate is arc-shaped; the extension plate is fixed to the arc segment of the groove wall by screws; the cross section of the extension plate is V-shaped with the smaller end facing the center line of the groove; the end face of the extension plate near the center line of the groove is tangent to the adjacent roller on the mounting plate.

4. The composite gear transmission rocker arm mechanism according to claim 3, characterized in that: The mounting groove has a rotating hole; the roller axis has a positioning hole; two positioning rods are installed in the positioning hole; the positioning rods are slidably installed in the positioning hole; a mounting spring is connected between the two positioning rods; the mounting spring causes one end of the positioning rod to extend out of the positioning hole; the positioning rod and the rotating hole are rotated together.

5. The composite gear transmission rocker arm mechanism according to claim 1, characterized in that: It also includes a drive unit; the drive unit is used to drive the turntable to rotate the needle rollers.

6. The composite gear transmission rocker arm mechanism according to claim 5, characterized in that: The drive device includes a worm and a gear transmission assembly; the worm's axis is arranged along a first direction; the worm is rotatably installed inside a housing; one end of the worm is connected to a motor; a worm wheel is provided below the worm; the worm wheel's axis is arranged along a second direction; the worm wheel is rotatably installed inside the housing; the worm wheel and worm mesh for transmission; the gear transmission assembly is used to drive the turntable to rotate when the motor drives the worm to rotate and the worm drives the worm wheel to rotate.

7. A composite gear transmission rocker arm mechanism according to claim 6, characterized in that: The gear transmission assembly includes a large gear and a small gear; the small gear is coaxially fixed on the worm gear; the large gear is coaxially fixed on the turntable; the diameter of the large gear is larger than the diameter of the small gear; the large gear and the small gear mesh for transmission.

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