Movable trundle of mowing machine chassis and application of movable trundle

Abstract

The invention relates to the technical field of trundles, and provides a movable trundle of a mowing machine chassis and application of the movable trundle, the mowing machine chassis is provided with a cutter head assembly, the cutter head assembly comprises a rotating shaft module and a cutter head module, and the rotating shaft module drives the cutter head module to rotate; each movable trundle comprises a wheel, a wheel shaft, a support and a mounting base, the wheels are rotationally connected to the supports through the wheel shafts, the supports are connected to the bottom face of the mounting base, steering shafts are connected to the supports, steering grooves are formed in the mounting base, the steering shafts are inserted into the steering grooves and slidably connected with the steering grooves, and when the steering shafts slide in the steering grooves, the wheels steer; the middle of the rotating shaft module is connected with the middle of the steering shaft, an included angle alpha is formed between the connecting line and the advancing direction of the mower chassis, and the steering angle of the wheels is smaller than the included angle alpha. The movable trundle has the advantages that (1) the movable trundle can only realize rotation of partial angles, so that other running parts are prevented from being influenced; and (2) the movable trundle cannot be stuck in various motion states, and the operation is flexible.

Description

Technical Field

[0001] The invention relates to the field of casters, and more particularly to a movable caster for a lawn mower chassis and application thereof. Background Art

[0002] Movable casters are also called universal wheels. Their structure allows 360-degree horizontal rotation. Casters are a general term, including movable casters and fixed casters. Fixed casters do not have a rotating structure and cannot rotate horizontally but only vertically. These two types of casters are generally used in combination. For example, the structure of a trolley is two fixed wheels in the front and two movable universal wheels in the back near the push handle.

[0003] Most universal wheels on the market have different wheel axles and steering axes. The steering axis is deflected a considerable distance relative to the wheel axle. The wheel can rotate 360 ​​degrees around the steering axis, which will sweep a large area. For example, a universal wheel with a diameter of 100mm has a diameter of about 160mm when rotating around its steering axis.

[0004] However, in many scenarios, universal wheels only need to be able to turn at certain angles, and do not need to rotate 360 ​​degrees without dead angles. Such universal wheels waste a lot of floor space and cause negative effects. For example, the blade assembly of a lawn mower occupies a large amount of floor space in the middle of the lawn mower, and a number of cutting tools are also provided on the edge of the blade assembly. In the prior art, the casters distributed at the four corners can rotate and swing 360 degrees, and the swing is circular, such as Figure 1 As shown, A is the area occupied by the blade assembly, and B is the area required for the rotation of the caster. The swing of the caster can easily interfere with the cutting tool. In order to avoid the problem of mutual interference, the lateral size of the lawn mower needs to be increased to obtain sufficient floor space to separate the caster and the blade assembly, resulting in excess space on the lawn mower chassis, a non-compact structure, a relatively large size of the entire lawn mower, and increased material costs, storage costs and logistics costs; or a small radius universal wheel is used to avoid mutual interference, resulting in the off-road capability of the lawn mower being affected. Summary of the invention

[0005] The present invention aims to overcome at least one defect (shortcoming) of the above-mentioned prior art and provides a movable caster for a lawn mower chassis and an application thereof, so as to realize that the caster can rotate only a partial angle.

[0006] The technical solution adopted by the present invention is to provide a movable caster for a lawn mower chassis, wherein a cutter disc assembly is provided on the lawn mower chassis, the cutter disc assembly includes a rotating shaft module and a cutter disc module, the rotating shaft module drives the cutter disc module to rotate; the movable caster includes a wheel, an axle, a bracket and a mounting base, the wheel is rotatably connected to the bracket via the axle, the bracket is connected to the bottom surface of the mounting base, the bracket is connected to a steering shaft, a steering groove is provided on the mounting base, the steering shaft is inserted into the steering groove and slidably connected thereto, and when the steering shaft slides in the steering groove, the wheel is turned; a middle part of the rotating shaft module is connected to a middle part of the steering shaft, the connecting line forms an angle α with the forward direction of the lawn mower chassis, and the steering angle of the wheel is less than the angle α.

[0007] In this technical solution, the setting of the steering groove limits the moving range of the steering shaft, thereby limiting the rotation angle of the wheel. The angle α is set as follows: when the steering angle of the wheel is less than α, the wheel and the cutter head assembly do not interfere with each other.

[0008] On the mower chassis, the blade assembly is a structure arranged on one side of the movable caster, so α is an angle less than 180°, so that the steering angle of the wheel is less than 180°. Compared with the traditional 360° rotating caster, the area swept by the wheel in this solution is smaller. When the movable caster is installed on the equipment, the part that the wheel does not sweep can make room for other parts to avoid mutual interference. In this way, it is possible to prevent mutual interference without pulling the wheel and other parts apart, so that the wheel can be applied to equipment that requires a compact structure, and casters with a large radius can have more application scenarios, giving full play to their superior off-road capabilities and stable performance, and will not be replaced because of the large radius of the wheel itself interfering with other parts. In addition, since the rotation angle of the wheel itself is reduced, when multiple wheels are installed on the equipment, it can be avoided that the rotation angles of different wheels are too different and stuck, which makes it more convenient for users to control the steering.

[0009] Furthermore, the angle α is 120°, which is suitable for most lawn mower chassis and ensures that the wheel and the cutter disc assembly do not interfere with each other.

[0010] Furthermore, the turning groove is an arc-shaped groove, and the central angle corresponding to the arc-shaped groove is 30 to 119°.

[0011] In the present technical solution, when the mounting base moves forward or backward with the wheel, the steering shaft is at the end point of the steering groove. Since the arc groove is a curved shape, the steering shaft will be stuck by the curved part of the steering groove, preventing the steering shaft from moving in the groove when moving forward or backward, thereby preventing the occurrence of mis-steering. In this way, the steering groove does not need to prevent mis-steering by setting the inclination angle, and can meet more angle setting requirements.

[0012] The setting of the center angle will affect the arc length of the steering groove, thus affecting the turning angle of the wheel, and then affecting the turning radius. If the center angle is too large and the turning radius is too small, the equipment on which the wheel is located will be unstable. If the center angle is too small and the turning radius is too large, the equipment will be inflexible. Therefore, the appropriate setting of the center angle can ensure an appropriate turning radius, so that the equipment on which the caster is located can avoid obstacles in narrow and curved areas, improve flexibility, and ensure overall stability and balance.

[0013] Furthermore, the bottom end of the steering shaft is slidably connected to the bracket, and the sliding direction is the same as the forward direction of the wheel.

[0014] In the present technical solution, the steering shaft and the bracket are slidably connected so that there is more adjustment space between the wheel and the device connected to it when changing directions, preventing the wheel from getting stuck when changing from a steering state to a forward or backward state. Specifically, the example of changing from a right-turn state to a backward state is used for further explanation. In the case where the steering shaft and the bracket are not slidably connected, when the wheel changes from a right-turn state to a backward state, the wheel is subjected to a forward friction force. Due to the setting of the steering groove, the steering shaft gets stuck in the groove, making it difficult to align the wheel. In the case where the steering shaft and the bracket are directly slidably connected, since the friction force has a component force on the wheel in the sliding direction, the wheel drives the bracket to slide under the action of the component force, so that the friction force point moves relative to the steering shaft of the wheel, and then the friction force can drive the wheel to align and move backward smoothly. Similarly, the sliding connection setting of the present solution can also prevent the wheel from getting stuck when moving forward after turning right, moving forward after turning left, and moving backward after turning left, so that the wheel can rotate smoothly under different circumstances, reducing the probability of users manually adjusting the direction of the wheel and the device connected to it, thereby improving the efficiency of using the device.

[0015] Furthermore, a sliding block is provided at the bottom end of the steering shaft, a sliding rail plate is connected to the top of the bracket, and the sliding block is matched and connected with the sliding rail on the sliding rail plate.

[0016] In the technical solution, the slide rail plate is a plate provided with a slide rail structure, and the sliding connection structure is simple and easy to manufacture by setting the slider and the slide rail. By setting the slide rail plate instead of setting the slide rail directly on the bracket, it can prevent the slider from being affected by the wheel when it is close to the wheel, for example, when a foreign object is stuck on the wheel. In this way, the sliding is ensured to proceed smoothly.

[0017] Furthermore, the bracket includes a top plate and a vertical plate, the vertical plate is vertically connected to the top plate, the slide rail plate is connected to the top plate, and the wheel axle is connected to the vertical plate.

[0018] Furthermore, a mounting tube is connected to the mounting base.

[0019] In this technical solution, the installation tube can facilitate the installation of other components on the base.

[0020] Furthermore, a moving block is slidably connected in the steering groove, and the moving block divides the steering groove into a use section and an adjustment section, and the steering shaft is inserted into the use section.

[0021] In the technical solution, the length of the use section is adjusted by moving the block, thereby adjusting the rotation angle of the wheel, so as to obtain different turning radii, which is convenient for reducing the turning radius when flexibility needs to be improved, and increasing the turning radius when stability needs to be improved, thereby meeting different angle rotation requirements, adapting to more road conditions, and matching more types of lawn mowers. For manufacturers, it improves sales prospects and increases revenue, and for users, it improves convenience of use.

[0022] Furthermore, it also includes a fastener, and a through hole is provided on the mounting base along the steering groove, and the fastener abuts against the moving block through the through hole.

[0023] In the present technical solution, the moving block is fixed at the target position by fasteners, thereby adjusting the length of the use section. In this way, when the impact force of the steering shaft on the moving block is large, the moving block will not be displaced relative to the steering groove, and there is no need to adjust the length of the use section a second time, making the caster more convenient to use.

[0024] Furthermore, a side of the moving block facing the use section and an end surface of the steering groove located at the use section are both provided with elastic pads.

[0025] In this technical solution, the elastic pad plays a shock-absorbing role. When the impact force of the steering shaft on the moving block or the steering groove is large, the elastic pad can have a buffering effect to prevent the equipment where the movable caster is located from shaking, thereby improving the overall stability.

[0026] Another object of the present invention is to provide a lawn mower chassis, wherein the chassis is connected with a driving rear wheel and a driven front wheel, wherein the driven front wheel is any one of the above-mentioned movable casters, and the forward direction of the mounting base is the same as the forward direction of the chassis.

[0027] Furthermore, the active rear wheel is provided with a driving motor for independent driving, and the active rear wheel drives the driven front wheel for differential steering.

[0028] In the technical solution, the lawn mower chassis is provided with two active rear wheels, and each active rear wheel is provided with a driving motor for independent driving.

[0029] Another object of the present invention is to provide a lawn mower, comprising a lawn mower body and any one of the above-mentioned lawn mower chassis, wherein the lawn mower body is connected to the lawn mower chassis.

[0030] The movable caster of the present invention is installed on the chassis of the lawn mower. Since the rotation angle of the caster is reduced, the area swept during rotation is also reduced, which can avoid the interference of the movable caster with the components installed on the lawn mower, and there is no need to increase the distance between the two, so that the structure of the lawn mower is more compact, the occupied space is reduced, the flexibility is improved, and the production materials and costs of the lawn mower are saved. Even in the case of a large radius of the caster, the mutual interference between the caster and other components on the equipment can be avoided, thereby improving the stability of the lawn mower.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) In the present invention, the area swept by the wheel is smaller. When the movable caster is installed on the equipment, the part not swept by the wheel can make room for other parts to avoid mutual interference. In this way, it is possible to prevent mutual interference without pulling the wheel and other parts apart, so that the wheel can be suitable for equipment that requires a compact structure, and casters with a large radius can have more application scenarios, giving full play to their superior off-road capabilities and stability, and will not be replaced because of the large radius of the wheel itself interfering with other parts. In addition, since the rotation angle of the wheel itself is reduced, when multiple wheels are installed on the equipment, it can avoid the rotation angles of different wheels being too different and getting stuck, which makes it more convenient for users to control the steering.

[0033] (2) The steering shaft and the bracket are slidably connected to each other, so that there is more adjustment space between the wheel and the device connected to it when changing direction, preventing the wheel from getting stuck when changing from a steering state to a forward or reverse state.

[0034] (3) The length of the use section is adjusted by moving the block, thereby adjusting the rotation angle of the wheel to obtain different turning radii. This makes it convenient to reduce the turning radius when flexibility needs to be improved, and to increase the turning radius when stability needs to be improved. This meets different angle rotation requirements, adapts to more road conditions, and can match more types of lawn mowers. For manufacturers, this improves sales prospects and increases revenue, and for users, it improves convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The figure is a schematic diagram of the area swept by the movable caster in the prior art.

[0036] Figure 2 This is a schematic diagram of the area swept by the movable caster of Example 1.

[0037] Figure 3 This is a structural explosion diagram of the movable caster in Example 1.

[0038] Figure 4 This is a schematic diagram of the structure of the mounting base of Example 1.

[0039] Figure 5 This is a schematic diagram of the structure of the mounting base of Example 2.

[0040] Figure 6 This is a schematic diagram of the chassis structure of the lawn mower of Example 3.

[0041] Figure 7 It is a schematic diagram of the friction force on the left driven front wheel when the lawn mower chassis of Example 3 changes from turning right to moving backward.

[0042] Figure 8 This is a schematic diagram of the structure of the lawn mower chassis of Example 3 when it is moving forward.

[0043] Fig. 9 It is a structural schematic diagram of the lawn mower chassis of Example 3 when it moves backward.

[0044] Fig.10 This is a schematic diagram of the structure of the lawn mower chassis of Example 3 when turning left.

[0045] Fig.11 This is a schematic diagram of the structure of the lawn mower chassis of Example 3 when turning right.

[0046] Fig.12 This is a schematic diagram of the wheel of Example 1 when it rotates to an angle α.

[0047] Figure numerals: wheel 100, axle 200, bracket 300, top plate 310, vertical plate 320, mounting base 400, mounting cylinder 410, steering shaft 500, slider 510, steering groove 600, moving block 610, slide rail block 700, slide rail 710, lawn mower chassis 800, lawn mower 900. DETAILED DESCRIPTION

[0048] The drawings of the present invention are only for illustrative purposes and should not be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0049] Example 1

[0050] like Figure 3 and Figure 4As shown, the present embodiment provides a movable caster for a lawn mower chassis, wherein a blade disc assembly is provided on the lawn mower chassis, and the blade disc assembly includes a rotating shaft module and a blade disc module, wherein the rotating shaft module drives the blade disc module to rotate; the caster includes a wheel 100, an axle 200, a bracket 300 and a mounting base 400, wherein the wheel 100 is rotatably connected to the bracket 300 through the axle 200, wherein the bracket 300 is connected to the bottom surface of the mounting base 400, wherein a steering shaft 500 is connected to the bracket 300, wherein a steering groove 600 is provided on the mounting base 400, wherein the steering shaft 500 is inserted into the steering groove 600 and is slidably connected thereto, wherein when the steering shaft 500 slides in the steering groove 600, the wheel 100 realizes steering, wherein a middle portion of the rotating shaft module is connected to a middle portion of the steering shaft 500, wherein an angle α is formed between the connecting line and the forward direction of the lawn mower chassis, and the steering angle of the wheel 100 is less than the angle α. Specifically, a protrusion is provided at the top of the steering shaft 500 , and the protrusion of the steering shaft 500 is inserted into the steering groove 600 .

[0051] The setting of the steering groove 600 limits the moving range of the steering shaft 500, thereby limiting the rotation angle of the wheel 100. Preferably, the angle α is 120°. Figure 2 As shown, compared with the traditional 360° swivel caster rotation swept area ( Figure 2 B), the area swept by the wheel 100 in this solution is smaller ( Figure 2 C), when the movable caster is installed on the equipment, the part that the wheel 100 does not sweep can make room for other parts to avoid mutual interference. In this way, it is possible to prevent mutual interference without pulling the wheel 100 and other parts away from each other, so that the wheel 100 can be applied to equipment that requires a compact structure, and the caster with a large radius can have more application scenarios, giving full play to its superior off-road capability and stable performance, and will not be replaced because of the large radius of the wheel 100 itself interfering with other parts. In addition, since the rotation angle of the wheel 100 itself is reduced, when multiple wheels 100 are installed on the equipment, it can avoid the rotation angles of different wheels 100 being too different and getting stuck, which makes it more convenient for users to control the steering.

[0052] In addition, if Fig.12 As shown, when the rotation angle of the wheel is equal to α, the wheel and the cutter head assembly are closest (such as Fig.12 D) in the figure, setting the rotation angle of the wheel to be less than α not only sets the rotation angle of the wheel to be less than the traditional 360°, but also avoids interference with the cutter disc assembly to a large extent, thereby ensuring the normal operation of the cutter disc assembly and the wheel.

[0053] The steering groove 600 is an arc groove, and the central angle of the arc groove is 30 to 119°. For example, the central angle is 40°, 50°, 60°, 90°, 110° or 119°.

[0054] When the mounting base 400 moves forward or backward with the wheel 100, the steering shaft 500 is at the end point of the steering groove 600. Since the arc groove is a curved shape, the steering shaft 500 will be stuck by the curved part of the steering groove 600, preventing the steering shaft 500 from moving in the groove when moving forward or backward, thereby preventing the occurrence of mis-steering. In this way, the steering groove 600 does not need to prevent mis-steering by setting a tilt angle, and can meet more angle setting requirements.

[0055] The setting of the center angle will affect the arc length of the steering groove 600, thereby affecting the rotation angle of the wheel 100, and further affecting the turning radius. If the center angle is too large and the turning radius is too small, the device on which the wheel 100 is located will be unstable. If the center angle is too small and the turning radius is too large, the device will be inflexible. Therefore, the appropriate setting of the center angle can provide an appropriate turning radius, so that the device on which the caster is located can avoid obstacles in narrow and curved areas, improve flexibility, and ensure overall stability and balance.

[0056] The bottom end of the steering shaft 500 is slidably connected to the bracket 300, and the sliding direction is the same as the direction in which the wheel 100 moves forward. Specifically, a slider 510 is provided at the bottom end of the steering shaft 500, and a slide rail 710 block 700 is connected to the top of the bracket 300, and the slider 510 is matched and connected with the slide rail 710 on the slide rail 710 block 700. The mounting base 400 is connected with a mounting cylinder 410. Specifically, when the mounting base 400 moves forward, the steering shaft 500 slides in front of the wheel 100. When the mounting base 400 moves backward, the steering shaft 500 slides behind the driven wheel. In the direction of movement, when the mounting base 400 moves forward or backward, the steering shaft 500 is always in front of the wheel 100 to drag the wheel 100 forward.

[0057] The bracket 300 includes a top plate 310 and a vertical plate 320 . The vertical plate 320 is vertically connected to the top plate 310 . The slide rail 710 and the plate 700 are connected to the top plate 310 . The wheel axle 200 is connected to the vertical plate 320 .

[0058] Example 2

[0059] like Figure 3 and Figure 5 As shown, the embodiment provides a movable caster for a lawn mower chassis, and its structure is similar to that of embodiment 1, except that a moving block 610 is slidably connected in the steering groove 600, and the moving block 610 divides the steering groove 600 into a use section and an adjustment section, and the steering shaft 500 is inserted into the use section.

[0060] The length of the use section is adjusted by moving the block 610, thereby adjusting the rotation angle of the wheel 100, so as to obtain different turning radii, which is convenient for reducing the turning radius when flexibility needs to be improved, and increasing the turning radius when stability needs to be improved, thereby meeting different angle rotation requirements, adapting to more road conditions, and matching more types of lawn mowers 900. For manufacturers, it improves sales prospects and increases revenue, and for users, it improves convenience of use.

[0061] Furthermore, a fastener is included, and a through hole is provided on the mounting base 400 along the steering groove 600, and the fastener abuts against the moving block 610 through the through hole. The moving block 610 is provided with elastic pads on one side facing the use section and the end face of the steering groove 600 located at the use section.

[0062] The moving block 610 is fixed at the target position by fasteners to adjust the length of the use section. In this way, when the impact force of the steering shaft 500 on the moving block 610 is large, the moving block 610 will not be displaced relative to the steering groove 600, and there is no need to adjust the length of the use section a second time, making the caster more convenient to use.

[0063] The elastic pad plays a shock-absorbing role. When the impact force of the steering shaft 500 on the moving block 610 or the steering groove 600 is large, the elastic pad can play a buffering effect to prevent the equipment where the movable caster is located from shaking, thereby improving the overall stability.

[0064] Example 3

[0065] like Figures 7 to 11 As shown, this embodiment provides a lawn mower chassis 800, the chassis is connected with an active rear wheel and a driven front wheel, the driven front wheel is a movable caster provided in any one of Embodiment 1 or Embodiment 2, and the forward direction of the mounting base 400 is the same as the forward direction of the chassis. The lawn mower chassis 800 is connected with two active rear wheels, each of which is provided with a driving motor for independent driving, and the active rear wheel drives the driven front wheel for differential steering. Preferably, the mounting base 400 and the chassis are connected as one body.

[0066] In this embodiment, the steering shaft 500 and the bracket 300 are slidably connected to provide more adjustment space between the wheel 100 and the chassis to which it is connected when changing direction, thereby preventing the wheel 100 from getting stuck when changing from a steering state to a forward or backward state.

[0067] Specifically, the example of changing from a right-turn state to a backward state is used for further explanation. In the case where the steering shaft 500 and the bracket 300 are not slidably connected, when the wheel 100 changes from a right-turn state to a backward state, the wheel 100 is subjected to a forward friction force f, and the right driven front wheel can be smoothly straightened under the action of f, while due to the setting of the steering groove 600, the steering shaft 500 of the left driven front wheel is restricted from moving in the groove, resulting in greater difficulty in straightening the wheel 100, and the chassis is stuck when one wheel is straightened and the other wheel is tilted.

[0068] In the case where the steering shaft 500 and the steering shaft 500 are directly connected in a sliding manner, since the friction force f has a component force f1 on the wheel 100 in the sliding direction, the wheel 100 drives the bracket 300 to slide under the action of this component force, so that the force point of the friction force f moves relative to the steering shaft 500 of the wheel 100, and then the friction force f can drive the wheel 100 to align and move backward smoothly. Similarly, it can be seen that the setting of the sliding connection of this solution can also prevent the situation of forward movement after turning right, forward movement after turning left, and backward movement after turning left, so that the wheel 100 can rotate and run smoothly in different situations, reduce the probability of users manually adjusting the direction of the wheel 100 and the chassis, and improve the use efficiency of the equipment connected to the chassis.

[0069] In this embodiment, the sliding connection between the steering shaft 500 and the bracket 300 is further explained below. When the chassis moves forward, the active rear wheel and the driven front wheel are parallel, and the steering shaft 500 of the movable caster slides in front of the wheel 100. When the chassis moves backward, the active rear wheel and the driven front wheel are parallel, and the steering shaft 500 of the movable caster slides behind the wheel 100. In the direction of movement, when the chassis moves forward or backward, the steering shaft 500 of the movable caster is always in front of the wheel 100 to drag the wheel 100 forward. When the chassis turns left, the steering shaft 500 of the driven front wheel on the left side slides behind the wheel 100, and the driven front wheel on the right side slides in front of the driven front wheel. When the chassis turns right, the opposite is true.

[0070] Example 4

[0071] This embodiment provides a lawn mower 900 , which includes a lawn mower body and the lawn mower chassis 800 provided in Embodiment 3, wherein the lawn mower body is connected to the lawn mower chassis 800 .

[0072] The movable caster of the present invention is installed on the chassis of the lawn mower 900. Since the rotation angle of the caster is reduced, the area swept during rotation is also reduced, which can avoid the interference of the movable caster with the components installed on the lawn mower 900. Specifically, the lawn mower 900 is, for example, a lawn mower. The installation of the movable caster can avoid its interference with the cutter disc assembly, and there is no need to increase the distance between the two, so that the structure of the lawn mower 900 is more compact, the space occupied is reduced, the flexibility is improved, and the production materials of the lawn mower 900 are saved, saving costs. Even in the case of a large radius of the caster, mutual interference between the caster and other components on the lawn mower can be avoided, thereby improving the stability of the lawn mower 900. It can be seen that the movable caster of the present invention is highly practical and has a good application prospect.

[0073] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A movable caster for a lawn mower chassis, wherein the lawn mower chassis is provided with a cutter disc assembly, the cutter disc assembly comprises a rotating shaft module and a cutter disc module, the rotating shaft module drives the cutter disc module to rotate; the movable caster comprises a wheel, an axle, a bracket and a mounting base, the wheel is rotatably connected to the bracket through the axle, the bracket is connected to the bottom surface of the mounting base, and is characterized in that: A steering shaft is connected to the bracket, a steering groove is provided on the mounting base, the steering shaft is inserted into the steering groove and slidably connected thereto, and when the steering shaft slides in the steering groove, the wheel is steered; a middle part of the rotating shaft module is connected with a middle part of the steering shaft, and the connecting line forms an angle α with the forward direction of the lawn mower chassis, and the steering angle of the wheel is less than the angle α.

2. The movable caster wheel for the lawn mower chassis according to claim 1, characterized in that: The angle α is 120°.

3. The movable caster wheel for the lawn mower chassis according to claim 1, characterized in that: The turning groove is an arc groove, and the central angle corresponding to the arc groove is 30 to 119 degrees.

4. The movable caster wheel for the lawn mower chassis according to any one of claims 1 to 3, characterized in that: The bottom end of the steering shaft is slidably connected to the bracket, and the sliding direction is the same as the forward direction of the wheels.

5. The movable caster wheel for the lawn mower chassis according to claim 4, characterized in that: A sliding block is provided at the bottom end of the steering shaft, a sliding rail plate is connected to the top of the bracket, and the sliding block is matched and connected with the sliding rail on the sliding rail plate.

6. The movable caster wheel for the lawn mower chassis according to claim 5, characterized in that: The bracket comprises a top plate and a vertical plate, the vertical plate is vertically connected to the top plate, the slide rail plate is connected to the top plate, and the wheel axle is connected to the vertical plate.

7. The movable caster wheel for the lawn mower chassis according to claim 5, characterized in that: The installation base is connected with an installation tube.

8. A lawn mower chassis, characterized in that: The chassis is connected with a driving rear wheel and a driven front wheel, the driven front wheel is a movable caster of the lawn mower chassis according to any one of claims 1 to 7, and the forward direction of the mounting base is the same as the forward direction of the chassis.

9. The lawn mower chassis according to claim 8, characterized in that: The active rear wheel is provided with a driving motor for independent driving, and the active rear wheel drives the driven front wheel for differential steering.

10. A lawn mower, characterized in that: The utility model comprises a lawn mower body and a lawn mower chassis according to any one of claims 8 or 9, wherein the lawn mower body is connected to the lawn mower chassis.

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