Gear shift mechanism and lawn mower

Abstract

The present application belongs to the technical field of lawn mowers, and provides a gear shifting mechanism, which comprises a gear shifting box, the gear shifting box comprising a shell, a shift fork, a forward gear, a reverse gear, a sliding gear, a power output shaft, a power input shaft and a transmission gear, and further comprising: a pedal hinged to a frame of the lawn mower and rotatable about an X-axis direction; and a transmission unit, a power input end of which is connected to a power output end of the pedal, and a power output end of which is connected to the shift fork, and which is used to drive the shift fork to shift the sliding gear; and a lawn mower comprising the above gear shifting mechanism. The gear shifting mechanism and the lawn mower provided by the present application are simple in structure, reasonable in design, and can switch between forward gears, reverse gears and neutral gears by stepping on the pedal, thus being convenient to operate.

Description

A gear shifting mechanism and a lawnmower Technical Field

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

[0002] The gear shifting mechanism of a ride-on lawnmower is typically designed with forward, reverse, and neutral gears, used to control the lawnmower's forward, reverse, and stop movements. Existing lawnmower gear shifting mechanisms include an operating lever, a transmission unit, and a gearbox.

[0003] The shortcomings of the aforementioned gear shifting mechanism are that, during forward and reverse movement, the operator needs to manually operate the control lever to control the lawnmower's movement, making it inconvenient to operate as the operator needs to control both the steering wheel and the control lever with one hand while mowing the lawn. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of this invention is to provide a shifting mechanism and lawnmower that can be controlled by foot to move the lawnmower forward, backward and stop.

[0005] To achieve the above objectives, the present invention provides a gear shifting mechanism, including a gear shift housing, the gear shift housing comprising a housing, a shift fork, a forward gear, a reverse gear, a sliding gear, a power output shaft, a power input shaft, and a transmission gear, and further comprising:

[0006] The pedal, hinged to the lawnmower frame, is rotatable about the X-axis; and

[0007] The transmission unit has its power input end connected to the power output end of the pedal and its power output end connected to the shift fork, and is used to drive the shift fork to move the sliding gear.

[0008] Furthermore, the transmission unit includes:

[0009] A push-pull arm, which is arranged along the X-axis and slidably connected to the gear shift box, has a first end fixedly connected to the shift fork and a second end extending away from the shift fork, and can reciprocate linearly along the X-axis; and

[0010] 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.

[0011] Furthermore, the transmission assembly includes:

[0012] A drive shaft is provided along the Z-axis and rotatably connected to the gearbox, and it can rotate about the Z-axis.

[0013] A toggle arm, with its first end fixedly connected to the first end of the drive shaft and its second end connected to the push-pull arm, is used to drive the push-pull arm to move; and

[0014] The transmission structure has a power input end connected to the power output end of the pedal and a power output end connected to the power input end of the transmission shaft, which is used to drive the transmission shaft to rotate.

[0015] Furthermore, the transmission structure includes:

[0016] The first swing arm has its first end located at the hinge center of the pedal and fixedly connected to the pedal.

[0017] A rocker arm, the middle part of which is hinged to the vehicle frame, is rotatable about the X-axis;

[0018] A first push-pull rod, the first end of which is hinged to the second end of the first swing arm, and the second end of which is hinged to the first end of the rocker arm; and

[0019] The second 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.

[0020] Furthermore, the transmission structure also includes:

[0021] The second swing arm has its first end rotatably sleeved on the transmission shaft and its second end hinged to the second end of the second push-pull rod, and it can rotate around the Z-axis.

[0022] A transmission plate has a first end fixedly sleeved on the transmission shaft and a second end extending towards the second end of the second swing arm. The second end of the transmission plate is provided with two symmetrical sliding holes, and the ends of the two sliding holes that are away from the transmission shaft are relatively close to each other.

[0023] Slider, the two sliders are slidably connected to the transmission plate through the two sliding holes respectively; and

[0024] The first elastic element has its two ends connected to the two sliders respectively, and in its natural state, it has a tendency to move the two sliders toward each other.

[0025] The actuating arm is located between the two sliders, and one end of the slider facing the actuating arm extends to the side of the actuating arm away from the transmission plate and abuts against the transmission plate.

[0026] Furthermore, the transmission structure also includes:

[0027] The clamps are in the form of two plates, with the first end of each plate rotatably connected to the drive shaft and the second end extending away from the axis of the drive shaft.

[0028] The reset plate is L-shaped, with its first end fixedly connected to the drive shaft and its second end extending between the two clamping plates.

[0029] The second elastic element has its two ends connected to the two clamping plates respectively, and in its natural state, it has a tendency to move the two clamping plates closer to each other; and

[0030] The limiting block has a first end fixedly connected to the gear shift box and a second end extending between the two clamping plates, and the width of the limiting block is adapted to the width of the reset plate.

[0031] On the other hand, the present invention provides a lawnmower, including the shifting mechanism described in any one of claims 1-5.

[0032] The beneficial effects of this invention are:

[0033] The shifting mechanism and lawnmower provided by this invention, by setting a pedal, can drive the sliding gear of the shift box to move by stepping on the pedal, thereby achieving the purpose of switching the forward gear, reverse gear and neutral gear of the shift box by foot, which is convenient to operate. Attached Figure Description

[0034] 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.

[0035] Figure 1 is a perspective view of the gear shifting mechanism and the frame of the lawnmower provided in an embodiment of the present invention;

[0036] Figure 2 is an enlarged view of point A shown in Figure 1;

[0037] Figure 3 is an enlarged view of point B shown in Figure 1;

[0038] Figure 4 is an enlarged view of point C shown in Figure 1;

[0039] Figure 5 is an internal structural view of point C shown in Figure 4 (direction 1);

[0040] Figure 6 is an internal structural view (direction two) of point C shown in Figure 4.

[0041] Figure label:

[0042] 100 gearbox, 110 housing, 120 shift fork, 130 forward gear, 140 reverse gear, 150 sliding gear, 201 pedal, 202 push-pull arm, 203 drive shaft, 204 lever arm, 205 first swing arm, 206 rocker arm, 207 first push-pull rod, 208 second push-pull rod, 209 second swing arm, 210 transmission plate, 211 slider, 212 first elastic element, 213 clamping plate, 214 reset plate, 215 second elastic element, 216 limit block. Detailed Implementation

[0043] 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.

[0044] 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 those skilled in the art to which this invention pertains.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] As shown in Figures 1-6, the present invention provides a gear shifting mechanism, including a gear shift box 100. The gear shift box 100 includes a housing 110, a shift fork 120, a forward gear 130, a reverse gear 140, a sliding gear 150, a power output shaft, a power input shaft, and a transmission gear. Specifically, the power input shaft is connected to the power output end of the engine. The transmission gear, the forward gear 130, and the reverse gear 140 are all bevel gears. The transmission gear is fixedly sleeved on the power input shaft, and the forward gear 130 and the reverse gear 140 are rotatably sleeved on the power output shaft. The forward gear 130 and the reverse gear 140 are respectively located on both sides of the transmission gear and mesh with it. The sliding gear 150 is slidably sleeved on the power output shaft and located between the forward gear 130 and the reverse gear 140. An internal gear that meshes with the sliding gear 150 is provided on the side of the forward gear 130 and the reverse gear 140 facing the sliding gear 150. A shift fork 120 is mounted on a sliding gear 150, and the shift fork 120 is used to drive the sliding gear 150 to move. Specifically, the sliding gear 150 has three working positions: working position I, working position II, and working position III. When the sliding gear 150 is in working position I, it is neither engaged with the internal gear of the forward gear 130 nor with the internal gear of the reverse gear 140. Therefore, the power transmitted from the power input shaft cannot be transmitted to the power output shaft through either the forward gear 130 or the reverse gear 140; that is, the sliding gear 150 is in neutral. When the sliding gear 150 is in working position II, the sliding gear 150... The sliding gear 150 meshes with the internal gear on the forward gear 130, allowing power from the power input shaft to be transmitted to the sliding gear 150. The sliding gear 150 then drives the power output shaft to rotate, thus propelling the lawnmower forward. When the sliding gear 150 is in working position III, it meshes with the internal gear on the reverse gear 140, allowing power from the power input shaft to be transmitted to the sliding gear 150. The sliding gear 150 then drives the power output shaft to rotate, thus propelling the lawnmower backward. These are all existing technologies and will not be elaborated upon further.

[0050] To better understand the structure and principle of this invention, 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.

[0051] The aforementioned shifting mechanism also includes a pedal 201 and a transmission unit.

[0052] The pedal 201 is hinged to the frame of the lawnmower and can rotate around the X-axis, meaning the hinge center line of the pedal 201 is along the X-axis. Specifically, the pedal 201 has three working positions, which we will name the first working position A, the second working position A, and the third working position A. When the sliding gear 150 is in working position I, the pedal 201 is in the first working position A; when the sliding gear 150 is in working position II, the pedal 201 is in the second working position A; and when the sliding gear 150 is in working position III, the pedal 201 is in the third working position A.

[0053] By stepping on the pedal 201, the pedal 201 is driven from the first working position A or the third working position A to the second working position A. The pedal 201 drives the sliding gear 150 from the working position I or the working position III to the working position II through the transmission unit. The sliding gear 150 meshes with the internal gear on the forward gear 130, so that the power transmitted from the power input shaft can be transmitted to the sliding gear 150 through the forward gear 130. The sliding gear 150 drives the power output shaft to rotate, thereby achieving the purpose of driving the lawnmower forward.

[0054] The power input end of the transmission unit is connected to the power output end of the pedal 201, and the power output end is connected to the shift fork 120. It is used to drive the shift fork 120 to move the sliding gear 150.

[0055] In use, the pedal 201 is driven to rotate by stepping on it, which in turn drives the shift fork 120 to move the sliding gear 150 through the transmission unit, thereby achieving the purpose of shifting gears.

[0056] Specifically, by stepping on the pedal 201, the pedal 201 is driven from the first working position A or the second working position A to the third working position A. The pedal 201 drives the sliding gear 150 from the working position I or the working position II to the working position III through the transmission unit. The sliding gear 150 meshes with the internal gear on the reversing gear 140, so that the power transmitted from the power input shaft can be transmitted to the sliding gear 150 through the reversing gear 140. The sliding gear 150 drives the power output shaft to rotate, thereby achieving the purpose of driving the lawnmower backward.

[0057] By stepping on the pedal 201, the pedal 201 is driven from the second working position A or the third working position A to the first working position A. The pedal 201 drives the sliding gear 150 from the working position II or the working position III to the working position I through the transmission unit. The sliding gear 150 is neither meshed with the internal gear of the forward gear 130 nor with the internal gear of the reverse gear 140. The power transmitted from the power input shaft cannot be transmitted to the power output shaft through the forward gear 130 or the reverse gear 140. That is, the sliding gear 150 is in the neutral position.

[0058] Preferably, the middle part of the pedal 201 is hinged to the frame of the lawnmower, so that the pedal 201 can be driven to rotate in the forward or reverse direction by stepping on the pedal 201. At the same time, it is easy to determine the position of the baffle. Specifically, when the pedal 201 is held in the first working position A, the gearbox 100 is in the neutral position. When the pedal 201 is pressed forward, the pedal 201 rotates in the forward direction to the second working position A, and the gearbox 100 is in the forward gear. When the pedal 201 is pressed backward, the pedal 201 rotates in the reverse direction to the third working position A, and the gearbox 100 is in the reverse gear.

[0059] The shifting mechanism of this structure is simple and reasonably designed. It can control the lawnmower to move forward, backward and stop by stepping on the foot pedal 201, making it easy to operate.

[0060] In one embodiment, the transmission unit includes a push-pull arm 202 and a transmission assembly.

[0061] The push-pull arm 202 is arranged along the X-axis and slidably connected to the shift gearbox 100. The first end of the push-pull arm 202 is fixedly connected to the shift fork 120, and the second end extends away from the shift fork 120. The push-pull arm 202 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 201, and the power output end is connected to the power input end of the push-pull arm.

[0062] In use, the pedal 201 is driven to rotate by stepping on it. The pedal 201 drives the push-pull arm 202 to move through the transmission component. The push-pull arm 202 drives the shift fork 120 to move. The shift fork 120 moves the sliding gear 150, thereby achieving the purpose of shifting gears.

[0063] The transmission unit of this structure is simple in structure, reasonable in design, and easy to operate.

[0064] In one embodiment, the transmission assembly includes a transmission shaft 203, a lever arm 204, and a transmission structure.

[0065] The drive shaft 203 is arranged along the Z-axis and rotatably connected to the shift box 100, and can rotate around the Z-axis. The first end of the actuating arm 204 is fixedly connected to the first end of the drive shaft 203, and the second end is connected to the push-pull arm 202. The drive shaft 203 drives the push-pull arm 202 to move. Specifically, the second end of the actuating arm 204 has a slot, and the push-pull arm 202 has a locking block that matches the slot, which is movably inserted into the slot and fixedly connected to the push-pull arm 202. The power input end of the transmission structure is connected to the power output end of the pedal 201, and the power output end is connected to the power input end of the drive shaft.

[0066] In use, the pedal 201 is driven to rotate by stepping on it. The pedal 201 drives the transmission shaft 203 to rotate through the transmission structure. The transmission shaft 203 drives the shift arm 204 to rotate. The shift arm 204 drives the push-pull arm 202 to move. The push-pull arm 202 drives the shift fork 120 to move. The shift fork 120 drives the sliding gear 150 to rotate, thereby achieving the purpose of shifting gears.

[0067] The transmission components of this structure are simple in structure, reasonable in design, and easy to operate.

[0068] In one embodiment, the transmission structure includes a first swing arm 205, a rocker arm 206, a first push-pull rod 207, and a second push-pull rod 208.

[0069] The first end of the first swing arm 205 is located at the hinge center of the pedal 201 and is fixedly connected to the pedal 201, allowing the second end of the first swing arm 205 to rotate around the first end, with the rotation center line of the first swing arm 205 coinciding with the rotation center line of the pedal 201. The middle part of the rocker arm 206 is hinged to the frame of the lawnmower, and the rocker arm 206 can rotate around the X-axis. The first end of the first push-pull rod 207 is hinged to the second end of the first swing arm 205, and the second end is hinged to the first end of the rocker arm 206. The first end of the first push-pull rod 207 is hinged to the second end of the first swing arm 205. The first end of the second push-pull rod 208 is hinged to the second end of the rocker arm 206, and the second end is connected to the power input end of the drive shaft 203.

[0070] In use, stepping on the foot pedal 201 drives the pedal 201 to rotate, which in turn drives the first swing arm 205 to rotate. The first swing arm 205 drives the rocker arm 206 to rotate via the first push-pull rod 207. The rocker arm 206 drives the transmission shaft 203 via the second push-pull rod 208. The transmission shaft 203 drives the shift arm 204 to rotate. The shift arm 204 drives the push-pull arm 202 to move. The push-pull arm 202 drives the shift fork 120 to move. The shift fork 120 drives the sliding gear 150 to rotate, thereby achieving the purpose of shifting gears.

[0071] The transmission structure of this device is simple, rationally designed, and easy to operate.

[0072] In one embodiment, the transmission structure further includes a second swing arm 209, a transmission plate 210, a slider 211, and a first elastic element 212.

[0073] The first end of the second swing arm 209 is rotatably sleeved on the transmission shaft 203, and the second end is hinged to the second end of the second push-pull rod 208. The second swing arm 209 can rotate around the Z-axis. The first end of the transmission plate 210 is fixedly sleeved on the transmission shaft 203, and the second end extends towards the second end of the second swing arm 209. Preferably, the transmission plate 210 is parallel to the second swing arm 209. The second end of the transmission plate 210 is provided with two symmetrically arranged sliding holes, and the two sliding holes are closer together at the ends away from the transmission shaft 203, that is, the two sliding holes form a figure-eight shape. There are two sliders 211, and the two sliders 211 are slidably connected to the transmission plate 210 through the two sliding holes respectively.

[0074] The two ends of the first elastic element 212 are respectively connected to the two sliders 211, and in its natural state, the first elastic element 212 has a tendency to move the two sliders 211 toward each other. Preferably, the first elastic element 212 is a spring.

[0075] The actuating arm 204 is located between two sliders 211. The end of the slider 211 facing the actuating arm 204 extends to the side of the actuating arm 204 away from the transmission plate 210 and abuts against the swing arm. When the actuating arm 204 rotates, the slider 211 can be moved by the actuating arm 204, thereby driving the second swing arm 209 to rotate by the slider 211.

[0076] In use, by stepping on the pedal 201, the pedal 201 drives the first swing arm 205 to rotate, the first swing arm 205 drives the first push-pull rod 207 to move, the first push-pull rod 207 drives the rocker arm 206 to rotate, the rocker arm 206 drives the second push-pull rod 208 to move, the second push-pull rod 208 drives the second swing arm 209 to rotate, the second swing arm 209 drives the slider 211 to move. When the slider 211 moves to a certain position, the slider 211 drives the transmission plate 210 to rotate, the transmission plate 210 drives the transmission shaft 203 to rotate, the transmission shaft 203 drives the shift arm 204 to rotate, the shift arm 204 drives the push-pull arm 202 to move, the push-pull arm 202 drives the shift fork 120 to move, and the shift fork 120 drives the sliding gear 150 to move, thereby achieving the purpose of shifting gears.

[0077] Specifically, to better explain the principle of the transmission structure in this embodiment, we will name the two sliding holes Sliding Hole A and Sliding Hole B, respectively. The slider 211 slidably inserted into Sliding Hole A is called Sliding Hole A, and the slider 211 slidably inserted into Sliding Hole B is called Sliding Hole B. Simultaneously, since the pedal 201 has three working positions, the second swing arm 209 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 201 is in the first working position A, the second swing arm 209 is in the first working position B; when the pedal 201 is in the second working position A, the second swing arm 209 is in the second working position B; and when the pedal 201 is in the third working position A, the second swing arm 209 is in the third working position B.

[0078] During the rotation of the second swing arm 209 from the first working position B to the second working position B, the second swing arm 209 first moves the slider A along the sliding hole A towards the end of the sliding hole A closest to the transmission shaft 203. The slider A then moves the slider B along the sliding hole B towards the end of the sliding hole B furthest from the transmission shaft 203 via the first elastic element 212. When the slider B moves to the end of the sliding hole B furthest from the transmission shaft 203, the slider B rotates the transmission plate 210, the transmission plate 210 rotates the transmission shaft 203, the transmission shaft 203 rotates the actuating arm 204, the actuating arm 204 moves the push-pull arm 202, the push-pull arm 202 moves the shift fork 120, and the shift fork 120 moves the sliding gear 150, thereby achieving the purpose of shifting gears.

[0079] During the rotation of the second swing arm 209 from the first working position B to the third working position B, the second swing arm 209 first moves the slider B along the sliding hole B towards the end of the sliding hole B closest to the transmission shaft 203. The slider B then moves the slider A along the sliding hole A towards the end of the sliding hole A away from the transmission shaft 203 via the first elastic element 212. When the slider A moves to the end of the sliding hole A away from the transmission shaft 203, the slider A rotates the transmission plate 210, the transmission plate 210 rotates the transmission shaft 203, the transmission shaft 203 rotates the actuating arm 204, the actuating arm 204 moves the push-pull arm 202, the push-pull arm 202 moves the shift fork 120, and the shift fork 120 moves the sliding gear 150, thereby achieving the purpose of shifting gears.

[0080] The advantages of this design are as follows: First, the second swing arm 209 needs to be rotated by the pedal 201 at a certain angle before the second swing arm 209 rotates through the slider 211 and drives the transmission plate 210 to rotate, thereby driving the transmission shaft 203 to rotate and achieving the purpose of shifting gears. This can expand the travel of the pedal 201 and improve the operability of shifting gears. Second, the spring force of the first elastic element 212 pulls the corresponding slider 211 to drive the transmission plate 210 to rotate. If the sliding gear 150 does not correspond with the internal gears on the forward gear 130 and the reverse gear 140 during the shifting process, the deformation of the first elastic element 212 can prevent gear grinding. After the sliding gear 150 corresponds with the internal gears on the forward gear 130 and the reverse gear 140, under the action of the spring force of the first elastic element 212, the sliding gear 150 will move to the position where it meshes with the internal gears on the forward gear 130 and the reverse gear 140, thereby achieving the purpose of shifting gears.

[0081] In one embodiment, the transmission structure further includes a clamping plate 213, a reset plate 214, a second elastic element 215, and a limiting block 216.

[0082] There are two clamping plates 213. The first end of each clamping plate 213 is rotatably connected to the drive shaft 203, and the second end extends away from the axis of the drive shaft 203. The reset plate 214 is L-shaped. The first end of the reset plate 214 is fixedly connected to the drive shaft 203, and the second end extends between the two clamping plates 213. The two ends of the second elastic member 215 are respectively connected to the two clamping plates 213, and in its natural state, it has a tendency to move the two clamping plates 213 closer to each other. Specifically, the second elastic member 215 is a spring. The first end of the limiting block 216 is fixedly connected to the shift box 100, and the second end extends between the two clamping plates 213. The width of the limiting block 216 is adapted to the width of the reset plate 214. Specifically, when the pedal 201 is in the first working position A, the reset plate 214 corresponds to the limiting block 216.

[0083] In use, the drive shaft 203 rotates, which in turn rotates the reset plate 214. The reset plate 214 rotates one of the two clamping plates 213 against the elastic force of the second elastic element 215. Under the action of the limiting block 216, the other clamping plate 213 cannot rotate. Thus, when the pedal 201 is released, under the action of the elastic force of the second elastic element 215, the clamping plate 213 moves with the reset plate 214, thereby moving the reset plate 214 to the position corresponding to the limiting block 216, and thus resetting the pedal 201 to the first working position A.

[0084] The transmission structure of this structure is simple and reasonably designed, which facilitates the reset of pedal 201, so that pedal 201 can remain in the first working position A when the operator does not press pedal 201.

[0085] On the other hand, the present invention provides a lawnmower that includes the shifting mechanism described in any one of the above claims.

[0086] 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.

[0087] 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 gear shifting mechanism, comprising a gear shift box, the gear shift box including a housing, a shift fork, a forward gear, a reverse gear, a sliding gear, a power output shaft, a power input shaft, and a transmission gear, characterized in that: Also includes: The pedal, which is hinged to the frame of the lawnmower, can rotate about the X-axis. The transmission unit includes a power input end connected to the power output end of the pedal and a power output end connected to the shift fork, which drives the shift fork to move the sliding gear. The transmission unit includes a push-pull arm, which is arranged along the X-axis and slidably connected to the shift gearbox, with a first end fixedly connected to the shift fork and a second end extending away from the shift fork, capable of reciprocating linear motion along the X-axis. The transmission assembly includes a power input end connected to the power output end of the pedal and a power output end connected to the power input end of the push-pull arm. A drive shaft is arranged along the Z-axis and rotatably connected to the shift gearbox, and is rotatable about the Z-axis; a shift arm has a first end fixedly connected to a first end of the drive shaft and a second end connected to the push-pull arm, used to drive the push-pull arm to move; and a transmission structure has a power input end connected to the power output end of the pedal and a power output end connected to the power input end of the drive shaft, used to drive the drive shaft to rotate; the transmission structure includes: a first swing arm, the first end of which is located at the hinge center of the pedal and fixedly connected to the pedal; a rocker arm, the middle part of which is connected to the... The frame is hinged and can rotate about the X-axis; a first push-pull rod, the first end of which is hinged to the second end of the first swing arm and the second end of which is hinged to the first end of the rocker arm; and a second push-pull rod, the first end of which is hinged to the second end of the rocker arm and the second end of which is connected to the power input end of the drive shaft; the transmission structure further includes: a second swing arm, the first end of which is rotatably sleeved on the drive shaft and the second end of which is hinged to the second end of the second push-pull rod, and it can rotate about the Z-axis; a transmission plate, the first end of which is fixedly sleeved on the drive shaft and the second end of which is close to the second end of the second swing arm. Extending in the direction, the second end of the transmission plate is provided with two symmetrically arranged sliding holes, and the ends of the two sliding holes away from the transmission shaft are relatively close to each other; sliders, the two sliders are slidably connected to the transmission plate through the two sliding holes respectively; and a first elastic member, the two ends of which are respectively connected to the two sliders, and in its natural state, it has a tendency to move the two sliders toward each other; wherein, the actuating arm is located between the two sliders, and the end of the slider facing the actuating arm extends to the side of the actuating arm away from the transmission plate and abuts against the transmission plate.

2. The shifting mechanism according to claim 1, characterized in that, The transmission structure further includes: two clamping plates, the first end of which is rotatably connected to the transmission shaft and the second end of which extends away from the axis of the transmission shaft; a reset plate, which is L-shaped, the first end of which is fixedly connected to the transmission shaft and the second end of which extends between the two clamping plates; a second elastic member, the two ends of which are respectively connected to the two clamping plates, and in its natural state, which has a tendency to move the two clamping plates toward each other; and a limiting block, the first end of which is fixedly connected to the shift box and the second end of which extends between the two clamping plates, and the width of the limiting block is adapted to the width of the reset plate.

3. A lawnmower, characterized in that: Includes the shifting mechanism as described in any one of claims 1-2.

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