A transmission mechanism and lawnmower

Abstract

This invention belongs to the field of lawnmower technology and provides a transmission mechanism including a speed-changing unit. The speed-changing unit includes: a driving pulley coaxially mounted on a first input shaft and rotatably connected to the first input shaft; a driven pulley coaxially mounted on a second output shaft and drivingly connected to the second output shaft; a transmission belt mounted on the driving pulley and the driven pulley; and an adjustment module for adjusting the transmission ratio of the driving pulley and the driven pulley. The invention also provides a lawnmower including the above-described transmission mechanism. The transmission mechanism and lawnmower provided by this invention have a simple structure, reasonable design, and achieve stepless speed regulation.

Description

Technical Field

[0001] This invention relates to the field of lawnmower technology, specifically to a transmission mechanism and a lawnmower. Background Technology

[0002] In existing technology, ride-on lawnmowers typically achieve gear shifting through a gearbox. During operation, the operator places the lever in different gear positions, causing the moving gears within the gearbox to mesh with different gears, thereby changing the transmission ratio and thus shifting gears.

[0003] The shortcomings of the above-mentioned transmission method are: the gearbox has many gears and a complex structure, and because the gear ratio changes greatly, there will be a jerking sensation when switching between gears. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a transmission mechanism and lawnmower that have a simple structure and can achieve stepless speed change, so as to achieve the purpose of no jerking when shifting gears.

[0005] To achieve the above objectives, in one aspect, the present invention provides a transmission mechanism, including a speed-changing unit, wherein the speed-changing unit includes: The drive pulley is coaxially sleeved on the first input shaft and rotatably connected to the first input shaft. The driven pulley is coaxially sleeved on the first output shaft and is connected to the first output shaft for transmission. A transmission belt, which is fitted onto the driving pulley and the driven pulley; and An adjustment module is used to adjust the transmission ratio between the driving pulley and the driven pulley.

[0006] Furthermore, it also includes a first elastic element. The driving pulley and / or the driven pulley includes symmetrically arranged wheel body A and wheel body B. The opposite side of wheel body A and wheel body B is formed into a groove for fitting the transmission belt. The groove is V-shaped, and wheel body A and / or wheel body B are slidably fitted on the first output shaft. The first elastic element is used to make the two wheel bodies tend to move closer to each other.

[0007] Furthermore, the driven pulley includes wheel body A and wheel body B. Wheel body A is fixedly connected to the first output shaft, and wheel body B is slidably connected to the first output shaft. The first elastic element is sleeved on the first output shaft and located on the side of wheel body B away from wheel body A. The two ends of the first elastic element abut against wheel body B and the first output shaft respectively, and in its natural state, the first elastic element has a tendency to move wheel body B towards wheel body A.

[0008] Furthermore, it also includes a sliding sleeve, the wheel body B is fixedly connected to the sliding sleeve, and the sliding sleeve is slidably sleeved on the first output shaft.

[0009] Furthermore, the adjustment module includes: A tension pulley, disposed between the driving pulley and the driven pulley, has its outer circumferential surface in contact with the drive belt and can reciprocate along a direction approaching or away from the line connecting the driving pulley and the driven pulley; and A drive assembly, mounted on the frame of the lawnmower, has its power output end connected to the power input end of the tensioning wheel, and is used to drive the tensioning wheel to move.

[0010] Furthermore, the driving component includes: A first swing arm, the first end of which is hinged to the frame of the lawnmower, and the second end which can reciprocate between a first working position and a second working position around the first end; a tension wheel is disposed at the second end of the first swing arm and can move together with the second end of the first swing arm; and A drive structure is used to drive the first swing arm to reciprocate between the first working position and the second working position.

[0011] Furthermore, the driving structure includes: A first push-pull rod, the first end of which is hinged to the first swing arm; A drive device, the power output end of which is connected to the second end of the first push-pull rod, is used to drive the second end of the first push-pull rod to move toward or away from the first end of the first push-pull rod.

[0012] Furthermore, the first push-pull rod has a helical section.

[0013] On the other hand, the present invention also provides a lawnmower, including the transmission mechanism described in any one of the above claims.

[0014] The beneficial effects of this invention are: The transmission mechanism and lawnmower provided by this invention achieve speed change by changing the transmission ratio between the driving pulley and the driven pulley. The structure is simple, the design is reasonable, and stepless speed change can be achieved. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 An assembly perspective view of the transmission mechanism and the frame of the lawnmower provided in an embodiment of the present invention; Figure 2 for Figure 1 An enlarged view of point A shown; Figure 3 for Figure 1 The enlarged view at point B is shown; Figure 4 for Figure 3 The enlarged view at point C is shown; Figure 5 for Figure 3 The enlarged view at point D is shown; Figure 6 for Figure 3 An enlarged view of point E is shown below; Figure 7 for Figure 3 The internal structural view at point E shown (direction one); Figure 8 for Figure 3 The internal structural view at point E shown (direction two); Figure 9 for Figure 1 The partial sectional view shown.

[0017] Figure label: Driven pulley 110, driven pulley 120, wheel body B102, wheel body A101, transmission belt 200, first elastic element 300, tensioning wheel 410, first swing arm 420, first push-pull rod 430, spiral section 431, shift box 500, housing 510, shift fork 520, forward gear 530, reverse gear 540, pedal 601, push-pull arm 602, transmission shaft 603, actuating arm 604, second swing arm 605, rocker arm 608, second push-pull rod 607, third push-pull rod 608, third swing arm 609, transmission plate 610, slider 611, second elastic element 612, clamping plate 613, reset plate 614, third elastic element 615, limit block 616, sliding sleeve 700, bearing 800. Detailed Implementation

[0018] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0019] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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, and therefore should not be construed as a limitation of the present invention.

[0021] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] like Figure 1-9 As shown, the present invention provides a transmission mechanism, including a speed change unit, which includes a driving pulley 110, a driven pulley 120, a transmission belt 200, and an adjustment module.

[0025] The driving pulley 110 is coaxially mounted on the first input shaft and rotates with the rotation of the first input shaft. Specifically, the driving pulley 110 is fixedly connected to the first input shaft. The driven pulley 120 is coaxially mounted on the first output shaft and rotates with the rotation of the first output shaft. A transmission belt 200 is mounted on the driving pulley 110 and the driven pulley 120. An adjustment module is used to adjust the transmission ratio of the driving pulley 110 and the driven pulley 120. Specifically, the first input shaft is fixedly connected to the output end of the engine. For example, the first input shaft is fixedly connected to the crankshaft. Preferably, the first input shaft and the crankshaft are integrally formed. The first output shaft is mounted on the frame of the lawnmower via a mounting bracket. Specifically, a bearing 800 is fixedly mounted on the first end of the first output shaft, and the first output shaft is rotatably connected to the mounting bracket via the bearing 800.

[0026] In use, the transmission ratio between the driving pulley 110 and the driven pulley 120 is changed by adjusting the module, thereby achieving the purpose of speed change.

[0027] The transmission structure of this device is simple, rationally designed, and easy to operate.

[0028] In one embodiment, a first elastic element 300 is also included. The driving pulley 110 and / or driven pulley 120 include symmetrically arranged wheel bodies A101 and B102. The opposite sides of wheel bodies A101 and B102 are formed into grooves for housing the transmission belt 200. The grooves are V-shaped, and wheel bodies A101 and / or B102 are slidably fitted onto the first output shaft. The first elastic element 300 is used to encourage the two wheel bodies to move closer together. In this embodiment, the adjustment module changes the tension of the transmission belt 200, thereby changing the transmission ratio between the driving pulley 110 and the driven pulley 120. Specifically, since the length of the transmission belt 200 cannot be changed, when the transmission belt 200 becomes taut, it forces the distance between pulleys A101 and B102 to increase. This causes the transmission belt 200 to move closer to the rotation center line of pulleys A101 and B102, thus reducing the rotation radius of the transmission belt 200 and the pulley, thereby changing the transmission ratio between the driving pulley 110 and the driven pulley, achieving the purpose of speed change. Similarly, when the transmission belt 200 becomes slack, under the elastic force of the first elastic element 300, the distance between pulleys A101 and B102 decreases, and the transmission belt 200 moves away from the rotation center line of pulleys A101 and B102. This increases the rotation radius of the transmission belt 200 and the pulley, thereby changing the transmission ratio between the driving pulley 110 and the driven pulley, achieving the purpose of speed change.

[0029] In this embodiment, the driven pulley 120 includes a pulley body A101 and a pulley body B102. Pulley body A101 is fixedly connected to the first output shaft, and pulley body B102 is slidably connected to the first output shaft. A first elastic member 300 is sleeved on the first output shaft and located on the side of pulley body B102 away from pulley body A101. Both ends of the first elastic member 300 abut against pulley body B102 and the first output shaft, respectively. In its natural state, the first elastic member 300 has a tendency to cause pulley body B102 to move closer to pulley body A101. Specifically, the first elastic member 300 is a spring.

[0030] In this embodiment, a sliding sleeve 700 is also included. The wheel body B102 is fixedly connected to the sliding sleeve 700, and the sliding sleeve 700 is slidably sleeved on the first output shaft.

[0031] When in use, when the adjustment module tensions the transmission belt 200, the transmission belt 200 forces the distance between the two pulleys 101 to increase, so that the transmission belt 200 can move towards the axis of the pulley 101, thereby changing the transmission ratio between the driving pulley 110 and the driven pulley 120, and thus achieving the purpose of speed change.

[0032] Similarly, when the adjustment module loosens the transmission belt 200, during this process, under the action of the elastic force of the first elastic element 300, the distance between the two wheel bodies 101 decreases, and the transmission belt 200 moves away from the axis of the wheel body 101, thereby changing the transmission ratio between the driving pulley 110 and the driven pulley 120, and thus achieving the purpose of speed change.

[0033] The transmission structure of this device is simple, rationally designed, and can achieve stepless speed change.

[0034] In one embodiment, the adjustment module includes a tension wheel 410 and a drive assembly.

[0035] The tension pulley 410 is disposed between the driving pulley 110 and the driven pulley 120. The outer circumferential surface of the tension pulley 410 abuts against the transmission belt 200. The tension pulley 410 can reciprocate along the direction of the line connecting the driving pulley 110 and the driven pulley 120. Specifically, in this embodiment, the tension pulley 410 is disposed on the outer side of the transmission belt 200, so that when the tension pulley 410 moves towards the line connecting the driving pulley 110 and the driven pulley 120, the transmission belt 200 becomes taut; conversely, when it moves away from the line connecting the driving pulley 110 and the driven pulley 120, the transmission belt 200 becomes loose. The drive assembly is disposed on the frame of the lawnmower, and the power output end of the drive assembly is connected to the power input end of the tension pulley 410. The drive assembly is used to drive the tension pulley 410 to move.

[0036] In use, the drive assembly drives the tension wheel 410 to move, thereby changing the tension of the transmission belt 200 and thus achieving the purpose of speed change.

[0037] The adjustment module of this structure changes the tension of the transmission belt 200 by moving the tension wheel 410, thereby achieving the purpose of speed change. It has a simple structure, reasonable design, and is easy to operate.

[0038] In one embodiment, the drive component includes a first swing arm 420 and a drive structure.

[0039] The first end of the first swing arm 420 is hinged to the frame of the lawnmower, and the second end can reciprocate between the first working position and the second working position around the first end. The tension wheel 410 is located at the second end of the first swing arm 420 and can move together with the second end of the first swing arm 420. The drive structure is used to drive the first swing arm 420 to reciprocate between the first working position and the second working position.

[0040] In use, the drive structure drives the first swing arm 420 to swing, thereby driving the tension wheel 410 to move, and thus changing the tension of the transmission belt 200.

[0041] The drive components of this structure are simple in structure and reasonable in design.

[0042] In one embodiment, the drive structure includes a first push-pull rod 430 and a drive device.

[0043] The first end of the first push-pull rod 430 is hinged to the first swing arm 420. The power output end of the drive device is connected to the second end of the first push-pull rod 430, and the drive device is used to drive the second end of the first push-pull rod 430 to move towards or away from the first end of the first push-pull rod 430.

[0044] In use, the drive device drives the first push-pull rod 430 to move, the first push-pull rod 430 drives the first swing arm 420 to rotate, and the first swing arm 420 drives the tension wheel 410 to move, thereby changing the tension of the transmission belt 200 and thus achieving the purpose of speed change.

[0045] The drive structure of this design is simple and rationally designed.

[0046] Preferably, the driving device includes a cylinder, an electric push rod, or a hydraulic cylinder. In use, the cylinder, electric push rod, or hydraulic cylinder drives the first push-pull rod 430 to move, the first push-pull rod 430 drives the first swing arm 420 to rotate, and the first swing arm 420 drives the tension wheel 410 to move, thereby changing the tension of the transmission belt 200 and thus achieving the purpose of speed change.

[0047] Preferably, the lawnmower is equipped with a knob or button for controlling the drive mechanism. During use, the operator can change speeds by rotating the knob or pressing the button, making operation convenient.

[0048] Preferably, the first push-pull rod 430 has a helical section 431. By setting the helical section 431, the elasticity of the first push-pull rod 430 is increased, so that when the first push-pull rod 430 drives the tension wheel 410 to move, the distance between the two wheel bodies 101 can gradually increase as the first push-pull rod 430 moves, instead of the tension wheel 410 immediately driving the transmission belt 200 to move as soon as the first push-pull rod 430 moves. This avoids damage to the transmission belt 200 due to excessive speed change.

[0049] The aforementioned transmission mechanism also includes a shifting unit, which controls the lawnmower's forward, reverse, and stop (neutral) movements. The shifting unit includes a shift box 500, which comprises a housing 510, a shift fork 520, a forward gear 530, a reverse gear 540, a sliding gear, a second output shaft, a second input shaft, and a transmission gear. Specifically, the second input shaft is connected to the power output end of the transmission unit. Specifically, the second input shaft is fixedly connected to the first output shaft. Preferably, the first output shaft and the second input shaft are integrally formed.

[0050] The transmission gear, forward gear 530, and reverse gear 540 are all bevel gears. The transmission gear is fixedly mounted on the second input shaft. The forward gear 530 and reverse gear 540 are rotatably mounted on the second output shaft, and are respectively located on both sides of the transmission gear and mesh with it. A sliding gear is slidably mounted on the second output shaft and located between the forward gear 530 and the reverse gear 540. An internal gear that meshes with the sliding gear is located on the side of the forward gear 530 and the reverse gear 540 facing the sliding gear. A shift fork 520 is mounted on the sliding gear and is used to drive the sliding gear to move.

[0051] Specifically, the sliding gear has three working positions: working position I, working position II, and working position III. When the sliding gear is in working position I, it is neither meshed with the internal gear of the forward gear 530 nor with the internal gear of the reverse gear 540. Power transmitted from the second input shaft cannot be transmitted to the second output shaft through either the forward gear 530 or the reverse gear 540; in other words, the sliding gear is in neutral. When the sliding gear is in working position II, it meshes with the internal gear on the forward gear 530, allowing power from the second input shaft to be transmitted to it. The sliding gear then drives the second output shaft to rotate, thus driving the lawnmower forward. When the sliding gear is in working position III, it meshes with the internal gear on the reverse gear 540, allowing power from the second input shaft to be transmitted to it through the reverse gear 540. The sliding gear then drives the second output shaft to rotate, thus driving the lawnmower backward. These are existing technologies and will not be elaborated upon further here.

[0052] To better understand the structure and principle of this utility model, we first define the X-axis, Y-axis, and Z-axis. The X-axis represents the width of the lawnmower, the Y-axis represents the length of the lawnmower, and the Z-axis represents the vertical direction.

[0053] The aforementioned shift unit also includes a pedal 601 and a transmission module.

[0054] The pedal 601 is hinged to the frame of the lawnmower. The pedal 601 can rotate around the X-axis, meaning the hinge center line of the pedal 601 is along the X-axis. Specifically, the pedal 601 has three working positions, which we will name first working position A, second working position A, and third working position A. When the sliding gear is in working position I, the pedal 601 is in first working position A; when the sliding gear is in working position II, the pedal 601 is in second working position A; and when the sliding gear is in working position III, the pedal 601 is in third working position A.

[0055] By stepping on the pedal 601, the pedal 601 is driven from the first working position A or the third working position A to the second working position A. The pedal 601 drives the sliding gear from the working position I or the working position III to the working position II through the transmission module. The sliding gear meshes with the internal gear on the forward gear 530, so that the power transmitted from the second input shaft can be transmitted to the sliding gear through the forward gear 530. The sliding gear drives the second output shaft to rotate, thereby achieving the purpose of driving the lawnmower forward.

[0056] The power input end of the transmission module is connected to the power output end of the pedal 601, and the power output end is connected to the shift fork 520, which is used to drive the shift fork 520 to move the sliding gear.

[0057] In use, the pedal 601 is driven to rotate by stepping on it, which in turn drives the shift fork 520 to move the sliding gear through the transmission module, thereby achieving the purpose of shifting gears.

[0058] Specifically, by stepping on the pedal 601, the pedal 601 is driven from the first working position A or the second working position A to the third working position A. The pedal 601 drives the sliding gear from the working position I or the working position II to the working position III through the transmission module. The sliding gear meshes with the internal gear on the retracting gear 540, so that the power transmitted from the second input shaft can be transmitted to the sliding gear through the retracting gear 540. The sliding gear drives the second output shaft to rotate, thereby achieving the purpose of driving the lawnmower backward.

[0059] By stepping on the pedal 601, the pedal 601 is driven from the second working position A or the third working position A to the first working position A. The pedal 601 drives the sliding gear from the working position II or the working position III to the working position I through the transmission module. The sliding gear is neither meshed with the internal gear of the forward gear 530 nor with the internal gear of the reverse gear 540. The power transmitted from the second input shaft cannot be transmitted to the second output shaft through the forward gear 530 or the reverse gear 540. That is, the sliding gear is in the neutral position.

[0060] Preferably, the middle part of the pedal 601 is hinged to the frame of the lawnmower, so that the pedal 601 can be driven to rotate in the forward or reverse direction by stepping on it. At the same time, it is easy to determine the position of the baffle. Specifically, when the pedal 601 is held in the first working position A, the gearbox 500 is in the neutral position. When the pedal 601 is pressed forward, the pedal 601 rotates in the forward direction to the second working position A, and the gearbox 500 is in the forward gear. When the pedal 601 is pressed backward, the pedal 601 rotates in the reverse direction to the third working position A, and the gearbox 500 is in the reverse gear.

[0061] The shifting unit of this structure is simple in structure and reasonable in design. It can control the lawnmower to move forward, backward and stop by stepping on the foot pedal 601, making it easy to operate.

[0062] In one embodiment, the transmission module includes a push-pull arm 602 and a transmission assembly.

[0063] The push-pull arm 602 is arranged along the X-axis and slidably connected to the shift gearbox 500. The first end of the push-pull arm 602 is fixedly connected to the shift fork 520, and the second end extends away from the shift fork 520. The push-pull arm 602 can reciprocate linearly along the X-axis. The power input end of the transmission assembly is connected to the power output end of the pedal 601, and the power output end is connected to the power input end of the push-pull arm 602.

[0064] In use, the pedal 601 is driven to rotate by stepping on it. The pedal 601 drives the push-pull arm 602 to move through the transmission component. The push-pull arm 602 drives the shift fork 520 to move. The shift fork 520 moves the sliding gear, thereby achieving the purpose of shifting gears.

[0065] The transmission module of this structure is simple, reasonably designed, and easy to operate.

[0066] In one embodiment, the transmission assembly includes a transmission shaft 603, a lever arm 604, and a transmission structure.

[0067] The drive shaft 603 is arranged along the Z-axis and rotatably connected to the shift box 500, and can rotate around the Z-axis. The first end of the actuating arm 604 is fixedly connected to the first end of the drive shaft 603, and the second end is connected to the push-pull arm 602. The drive shaft 603 drives the push-pull arm 602 to move. Specifically, the second end of the actuating arm 604 has a slot, and the push-pull arm 602 has a locking block that matches the slot, which is movably inserted into the slot and fixedly connected to the push-pull arm 602. The power input end of the transmission structure is connected to the power output end of the pedal 601, and the power output end is connected to the power input end of the drive shaft.

[0068] In use, the pedal 601 is driven to rotate by stepping on it. The pedal 601 drives the transmission shaft 603 to rotate through the transmission structure. The transmission shaft 603 drives the shift arm 604 to rotate. The shift arm 604 drives the push-pull arm 602 to move. The push-pull arm 602 drives the shift fork 520 to move. The shift fork 520 drives the sliding gear to rotate, thereby achieving the purpose of shifting gears.

[0069] The transmission components of this structure are simple in structure, reasonable in design, and easy to operate.

[0070] In one embodiment, the transmission structure includes a second swing arm 605, a rocker arm 608, a second push-pull rod 607, and a third push-pull rod 608.

[0071] The first end of the second swing arm 605 is located at the hinge center of the pedal 601 and is fixedly connected to the pedal 601, allowing the second end of the second swing arm 605 to rotate around the first end, with the rotation center line of the second swing arm 605 coinciding with the rotation center line of the pedal 601. The middle part of the rocker arm 608 is hinged to the frame of the lawnmower, and the rocker arm 608 can rotate around the X-axis. The first end of the second push-pull rod 607 is hinged to the second end of the second swing arm 605, and the second end is hinged to the first end of the rocker arm 608. The first end of the third push-pull rod 608 is hinged to the second end of the rocker arm 608, and the second end is connected to the power input end of the drive shaft 603.

[0072] In use, stepping on the foot pedal 601 drives the pedal 601 to rotate, which in turn drives the second swing arm 605 to rotate. The second swing arm 605 drives the rocker arm 608 to rotate via the second push-pull rod 607. The rocker arm 608 drives the transmission shaft 603 via the third push-pull rod 608. The transmission shaft 603 drives the shift arm 604 to rotate, which in turn drives the push-pull arm 602 to move. The push-pull arm 602 drives the shift fork 520 to move, which in turn drives the sliding gear to rotate, thereby achieving the purpose of shifting gears.

[0073] The transmission structure of this device is simple, rationally designed, and easy to operate.

[0074] In one embodiment, the transmission structure further includes a third swing arm 609, a transmission plate 610, a slider 611, and a second elastic member 612.

[0075] The first end of the third swing arm 609 is rotatably sleeved on the transmission shaft 603, and the second end is hinged to the second end of the third push-pull rod 608. The third swing arm 609 can rotate around the Z-axis. The first end of the transmission plate 610 is fixedly sleeved on the transmission shaft 603, and the second end extends towards the second end of the third swing arm 609. Preferably, the transmission plate 610 is parallel to the third swing arm 609. The second end of the transmission plate 610 is provided with two symmetrically arranged sliding holes, and the two sliding holes are closer together at the ends away from the transmission shaft 603, that is, the two sliding holes form a figure-eight shape. There are two sliders 611, and the two sliders 611 are slidably connected to the transmission plate 610 through the two sliding holes respectively.

[0076] The two ends of the second elastic element 612 are respectively connected to the two sliders 611, and in its natural state, the second elastic element 612 has a tendency to move the two sliders 611 toward each other. Preferably, the second elastic element 612 is a spring.

[0077] The actuating arm 604 is located between two sliders 611. The end of the slider 611 facing the actuating arm 604 extends to the side of the actuating arm 604 away from the transmission plate 610 and abuts against the swing arm. When the actuating arm 604 rotates, the slider 611 can be moved by the actuating arm 604, thereby driving the third swing arm 609 to rotate by the slider 611.

[0078] In use, by stepping on the pedal 601, the pedal 601 drives the second swing arm 605 to rotate, the second swing arm 605 drives the second push-pull rod 607 to move, the second push-pull rod 607 drives the rocker arm 608 to rotate, the rocker arm 608 drives the third push-pull rod 608 to move, the third push-pull rod 608 drives the third swing arm 609 to rotate, the third swing arm 609 drives the slider 611 to move. When the slider 611 moves to a certain position, the slider 611 drives the transmission plate 610 to rotate, the transmission plate 610 drives the transmission shaft 603 to rotate, the transmission shaft 603 drives the shift arm 604 to rotate, the shift arm 604 drives the push-pull arm 602 to move, the push-pull arm 602 drives the shift fork 520 to move, and the shift fork 520 drives the sliding gear to move, thereby achieving the purpose of shifting gears.

[0079] Specifically, to better explain the principle of the transmission structure in this embodiment, we will name the two sliding holes A and B, respectively. The slider 611 slidably inserted into sliding hole A is called slider A, and the slider 611 slidably inserted into sliding hole B is called slider B. Since the pedal 601 has three working positions, the third swing arm 609 also has three working positions, which we will name the first working position B, the second working position B, and the third working position B, respectively. Specifically, when the pedal 601 is in the first working position A, the third swing arm 609 is in the first working position B; when the pedal 601 is in the second working position A, the third swing arm 609 is in the second working position B; and when the pedal 601 is in the third working position A, the third swing arm 609 is in the third working position B.

[0080] During the rotation of the third swing arm 609 from the first working position B to the second working position B, the third swing arm 609 first moves the slider A along the sliding hole A towards the end of the sliding hole A closest to the drive shaft 603. The slider A then moves the slider B along the sliding hole B towards the end of the sliding hole B furthest from the drive shaft 603 via the second elastic element 612. When the slider B moves to the end of the sliding hole B furthest from the drive shaft 603, the slider B rotates the transmission plate 610, the transmission plate 610 rotates the drive shaft 603, the drive shaft 603 rotates the actuating arm 604, the actuating arm 604 moves the push-pull arm 602, the push-pull arm 602 moves the shift fork 520, and the shift fork 520 moves the sliding gear, thereby achieving the purpose of sliding.

[0081] During the rotation of the third swing arm 609 from the first working position B to the third working position B, the third swing arm 609 first moves the slider B along the sliding hole B towards the end of the sliding hole B closest to the drive shaft 603. The slider B then moves the slider A along the sliding hole A towards the end of the sliding hole A furthest from the drive shaft 603 via the second elastic element 612. When the slider A moves to the end of the sliding hole A furthest from the drive shaft 603, the slider A rotates the transmission plate 610, the transmission plate 610 rotates the drive shaft 603, the drive shaft 603 rotates the actuating arm 604, the actuating arm 604 moves the push-pull arm 602, the push-pull arm 602 moves the shift fork 520, and the shift fork 520 moves the sliding gear, thereby achieving the purpose of sliding.

[0082] The advantages of this design are as follows: First, the pedal 601 needs to drive the third swing arm 609 to rotate a certain angle before the third swing arm 609 rotates through the slider 611, which in turn drives the transmission plate 610 to rotate, thereby achieving the purpose of shifting gears. This expands the travel of the pedal 601, thus improving the operability of gear shifting. Second, the elastic force of the second elastic element 612 pulls the corresponding slider 611 to drive the transmission plate 610 to rotate. If, during gear shifting, the sliding gear does not correspond to the internal gears on the forward gear 530 and the reverse gear 540, the deformation of the second elastic element 612 can prevent gear grinding. After the sliding gear corresponds to the internal gears on the forward gear 530 and the reverse gear 540, under the action of the elastic force of the second elastic element 612, the sliding gear will move to the position where it meshes with the internal gears on the forward gear 530 and the reverse gear 540, thereby achieving the purpose of shifting gears.

[0083] In one embodiment, the transmission structure further includes a clamping plate 613, a reset plate 614, a third elastic element 615, and a limiting block 616.

[0084] There are two clamping plates 613. The first end of each clamping plate 613 is rotatably connected to the drive shaft 603, and the second end extends away from the axis of the drive shaft 603. The reset plate 614 is L-shaped. The first end of the reset plate 614 is fixedly connected to the drive shaft 603, and the second end extends between the two clamping plates 613. The two ends of the third elastic member 615 are respectively connected to the two clamping plates 613, and in its natural state, it has a tendency to move the two clamping plates 613 closer to each other. Specifically, the third elastic member 615 is a spring. The first end of the limiting block 616 is fixedly connected to the shift box 500, and the second end extends between the two clamping plates 613. The width of the limiting block 616 is adapted to the width of the reset plate 614. Specifically, when the pedal 601 is in the first working position A, the reset plate 614 corresponds to the limiting block 616.

[0085] In use, the drive shaft 603 rotates, which in turn rotates the reset plate 614. The reset plate 614 rotates one of the two clamping plates 613 against the elastic force of the third elastic element 615. Under the action of the limit block 616, the other clamping plate 613 cannot rotate. Thus, when the pedal 601 is released, under the action of the elastic force of the third elastic element 615, the clamping plate 613 moves with the reset plate 614, thereby moving the reset plate 614 to the position corresponding to the limit block 616, and thus resetting the pedal 601 to the first working position A.

[0086] The transmission structure of this structure is simple and reasonably designed, which facilitates the reset of pedal 601, so that pedal 601 can remain in the first working position A when the operator does not press pedal 601.

[0087] On the other hand, the present invention also provides a lawnmower, including the transmission mechanism of any one of the above.

[0088] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A transmission mechanism, characterized in that: Includes a transmission unit and a shifting unit; The speed change unit includes: The drive pulley is coaxially mounted on the first input shaft and can rotate as the first input shaft rotates; The driven pulley is coaxially mounted on the first output shaft and can rotate as the first output shaft rotates; A transmission belt, which is fitted onto the driving pulley and the driven pulley; and An adjustment module is used to adjust the transmission ratio between the driving pulley and the driven pulley; The shifting unit is used to control the lawnmower's forward, backward, and stop movements. The shifting unit includes a shift box, a pedal, and a transmission module. The gearbox includes: A transmission gear, a forward gear, and a reverse gear are mounted on the second input shaft. All three gears are bevel gears. The transmission gear is fixedly connected to the second input shaft. The forward gear and the reverse gear are respectively located on both sides of the transmission gear and mesh with it. Both the forward gear and the reverse gear are rotatably connected to the second output shaft. A sliding gear is sleeved on the second output shaft. The sliding gear is located between the forward gear and the reverse gear and is slidably connected to the second output shaft. The side of the forward gear and the reverse gear facing the sliding gear is provided with an internal gear that cooperates with the sliding gear. The sliding gear has three working positions: working position I, working position II, and working position III. When the sliding gear is in working position I, it is neither meshed with the internal gear of the forward gear nor with the internal gear of the reverse gear. When the sliding gear is in working position II, it meshes with the internal gear of the forward gear. When the sliding gear is in working position III, it meshes with the internal gear of the reverse gear, allowing power transmitted from the second input shaft to be transmitted to the sliding gear via the reverse gear. A shift fork, which is sleeved on the sliding gear, is used to drive the sliding gear to move; The pedal is hinged to the frame of the lawnmower. The pedal has three working positions: a first working position A, a second working position A, and a third working position A. When the sliding gear is in working position I, the pedal is in the first working position A; when the sliding gear is in working position II, the pedal is in the second working position A; and when the sliding gear is in working position III, the pedal is in the third working position A. The power input end of the transmission module is connected to the power output end of the pedal, and the power output end is connected to the shift fork, which is used to drive the shift fork to move the sliding gear. The transmission module includes: A push-pull arm, wherein the push-pull arm is arranged along the X-axis and slidably connected to the gear shift box, a first end of the push-pull arm is fixedly connected to the shift fork, and a second end extends away from the shift fork; the push-pull arm is capable of reciprocating linear motion along the X-axis. The transmission assembly has its power input end connected to the power output end of the pedal and its power output end connected to the power input end of the push-pull arm. The transmission assembly includes: A drive shaft is provided along the Z-axis and rotatably connected to the gearbox, and the drive shaft can rotate about the Z-axis. A toggle arm, the first end of which is fixedly connected to the first end of the drive shaft, and the second end of which is connected to the push-pull arm, the drive shaft being used to drive the push-pull arm to move; and The transmission structure has its power input end connected to the power output end of the pedal and its power output end connected to the power input end of the drive shaft; The transmission structure includes: The second swing arm has its first end located at the hinge center of the pedal and fixedly connected to the pedal, such that the second end of the second swing arm rotates around the first end, and the rotation center line of the second swing arm coincides with the rotation center line of the pedal. A rocker arm, the middle of which is hinged to the frame of the lawnmower, is rotatable about the X-axis. The second push-pull rod has its first end hinged to the second end of the second swing arm and its second end hinged to the first end of the rocker arm; and The third push-pull rod has its first end hinged to the second end of the rocker arm and its second end connected to the power input end of the drive shaft.

2. The transmission mechanism according to claim 1, characterized in that: It also includes a first elastic element. The driving pulley and / or the driven pulley includes a wheel body A and a wheel body B arranged symmetrically. The opposite side of the wheel body A and the wheel body B is formed into a groove for fitting the transmission belt. The groove is V-shaped, and the wheel body A and / or the wheel body B are slidably fitted on the first output shaft. The first elastic element is used to make the two wheel bodies tend to move closer to each other.

3. The transmission mechanism according to claim 2, characterized in that: The driven pulley includes wheel body A and wheel body B. Wheel body A is fixedly connected to the first output shaft, and wheel body B is slidably connected to the first output shaft. The first elastic element is sleeved on the first output shaft and located on the side of wheel body B away from wheel body A. The two ends of the first elastic element abut against wheel body B and the first output shaft respectively, and in its natural state, the first elastic element has a tendency to move wheel body B towards wheel body A.

4. The transmission mechanism according to claim 2, characterized in that: It also includes a sliding sleeve, the wheel body B is fixedly connected to the sliding sleeve, and the sliding sleeve is slidably sleeved on the first output shaft.

5. The transmission mechanism according to any one of claims 2-4, characterized in that: The adjustment module includes: A tension pulley, disposed between the driving pulley and the driven pulley, has its outer circumferential surface in contact with the drive belt and can reciprocate along a direction approaching or away from the line connecting the driving pulley and the driven pulley; and A drive assembly, mounted on the frame of the lawnmower, has its power output end connected to the power input end of the tensioning wheel, and is used to drive the tensioning wheel to move.

6. The transmission mechanism according to claim 5, characterized in that: The driving component includes: A first swing arm, the first end of which is hinged to the frame of the lawnmower, and the second end which can reciprocate between a first working position and a second working position around the first end; a tension wheel is disposed at the second end of the first swing arm and can move together with the second end of the first swing arm; and A drive structure is used to drive the first swing arm to reciprocate between the first working position and the second working position.

7. The transmission mechanism according to claim 6, characterized in that: The driving structure includes: A first push-pull rod, the first end of which is hinged to the first swing arm; A drive device, the power output end of which is connected to the second end of the first push-pull rod, is used to drive the second end of the first push-pull rod to move toward or away from the first end of the first push-pull rod.

8. The transmission mechanism according to claim 7, characterized in that: The first push-pull rod has a helical section.

9. A lawnmower, characterized in that: Includes the transmission mechanism described in any one of claims 1-8.

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