Electric adjustment mechanism for a lawnmower

Abstract

The utility model discloses a kind of electric adjusting mechanism of mower, including front wheel assembly, rear wheel assembly and connecting rod, its gist is:still including mounting seat and driving device.Installing seat is fixedly arranged on casing.Driving device includes driving motor, connecting rod driving seat, driving motor is fixedly arranged on mounting seat, connecting rod driving seat is fixedly arranged on the front of connecting rod, driving motor drives connecting rod driving seat to move forward and backward, to drive connecting rod to move forward and backward, adjust the height of mower.

Description

Technical Field

[0001] This utility model relates to the field of garden tool technology, specifically an electric adjustment mechanism for adjusting the height of a lawnmower. Background Technology

[0002] Electric lawnmowers are common gardening tools, allowing for height adjustment to suit different needs. Chinese patent document CN220606606U discloses a height adjustment mechanism and a lawnmower mounted on a chassis. The chassis has a swing arm axle and wheels connected to it. An upper housing is mounted on the chassis via a limiting member, and a lifting handle is located in the center of the upper housing. The height adjustment mechanism includes: a drive unit located on one side of the lifting handle and mounted on the chassis via a first elastic member, with a limiting protrusion engaging with a circumferentially oriented limiting recess on the swing arm axle; and a connecting unit connected at both ends to two swing arm axles, enabling synchronous movement of the two swing arm axles. Pressing the drive unit causes the limiting protrusion to disengage from the limiting recess, allowing the chassis to be adjusted upwards or downwards to a designated position. Releasing the drive unit then engages the limiting protrusion with the limiting recess, securing the lawnmower in place. Chinese patent document CN208113348U discloses a push-type lawnmower with adjustable cutting height, including a frame, several wheels on both sides of the frame, a cutting mechanism installed at the bottom of the frame, and a push handle connected to the frame. A height adjustment device is provided on one side of the frame. The height adjustment device includes an adjustment rod rotatably mounted on the frame, an adjustment crossbar inserted into the frame and rotatably connected to the adjustment rod, and a limiting mechanism for limiting the rotation of the adjustment rod. Several turntables corresponding to the wheels are rotatably mounted on the adjustment crossbar, and the turntables are rotatably connected to the wheels through a rotating shaft. When the lawnmower needs to adjust the cutting height, press down on the height adjustment handle 531. The return spring 5321 is compressed, causing the limit block 534 to disengage from the limit groove 5331. Then, rotate the adjustment rod 51. The adjustment rod 51 drives the adjustment crossbar 52 to rotate around the connection point between the adjustment rod 51 and the frame 1. The turntable 54 rotates around the shaft 6 under the influence of the adjustment crossbar 52. When the frame 1 is adjusted to the desired height, stop rotating the adjustment rod 51 and release the height adjustment handle 531. The restoring force of the return spring 5321 forces the height adjustment handle 531 to reset, and the limit block 534 re-engages in the limit groove 5331, so that the frame 1 and the adjustment crossbar 52 are at the set height, thus achieving the adjustment of the cutting height of the lawnmower. Both of the above methods are manual adjustments, which are inconvenient, with only a few height adjustment levels and a narrow adjustment range. Utility Model Content

[0003] The purpose of this invention is to provide an electric adjustment mechanism for a lawnmower that is simple in structure and easy to adjust.

[0004] The basic technical solution for achieving the purpose of this utility model is: an electric adjustment mechanism for a lawnmower, including a front wheel assembly, a rear wheel assembly, and a connecting rod, characterized by further including a mounting base and a drive device. The mounting base is fixedly mounted on the machine housing. The drive device includes a drive motor and a connecting rod drive seat. The drive motor is fixedly mounted on the mounting base, and the connecting rod drive seat is fixedly mounted on the front part of the connecting rod. The drive motor drives the connecting rod drive seat to move back and forth, thereby driving the connecting rod to move back and forth to adjust the height of the lawnmower.

[0005] Furthermore, to ensure self-locking after adjustment, the drive unit also includes a lead screw connecting seat, a lead screw, a lead screw nut, and a lead screw nut seat. The connecting rod drive seat has guide grooves running vertically through its left and right sides. The lead screw connecting seat is slidably mounted on the connecting rod drive seat vertically. The front end of the lead screw is fixedly mounted on the lead screw connecting seat. The lead screw nut seat is rotatably mounted on the mounting base, driven by a drive motor. The lead screw nut is fixedly mounted on the front end of the lead screw nut seat and screwed onto the lead screw.

[0006] Furthermore, to protect the motor, an assist device is also included, which provides assistance when the lawnmower rises.

[0007] Furthermore, to protect the motor: the assist device uses a tension spring, with one end of the tension spring fixedly mounted on the housing and the other end fixedly mounted on the connecting rod drive seat.

[0008] Furthermore, to improve the smoothness and reliability of adjustment: the mounting base is provided with a limit groove, and the connecting rod is slidably set in the limit groove.

[0009] The present invention has the following beneficial effects: (1) The electric adjustment mechanism of the lawn mower of the present invention has a simple structure. The height can be linearly adjusted by motor control. It adopts a lead screw and lead screw nut, which has a self-locking function. It can stop at any height within the adjustment range and has a wide adjustment range. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the electric adjustment mechanism of the lawnmower of this utility model when it is in its highest state.

[0011] Figure 2 From Figure 1 A diagram showing the view from the upper right front.

[0012] Figure 3 From Figure 1 This is a diagram showing the device after removing the casing when viewed from the upper right front.

[0013] Figure 4 From Figure 1 This is a diagram showing the device after removing the casing when viewed from the upper left rear.

[0014] Figure 5 From Figure 1 This is a diagram showing the device in its lower position after the casing has been removed, when viewed from the upper right front.

[0015] Figure 6 From Figure 1 This is a diagram showing the device in its lower position after the casing has been removed, when viewed from the upper left rear.

[0016] Figure 7 From Figure 1 This is a diagram showing the device after removing the casing when viewed from the left side.

[0017] Figure 8 From Figure 1 This is a diagram showing the device in its lower position after the casing has been removed, as viewed from the left side.

[0018] The labels in the diagram are:

[0019] Front wheel assembly 1, front wheel 1-1, front wheel adjusting axle 1-2, front wheel mounting plate 1-3,

[0020] Rear wheel assembly 2, rear wheel 2-1, rear wheel adjusting shaft 2-2, rear wheel mounting plate 2-3,

[0021] Link 3,

[0022] Mounting base 4, limiting groove 4-1

[0023] Drive unit 5, drive motor 5-1, connecting rod drive seat 5-2, guide groove 5-21, lead screw connecting seat 5-3, lead screw 5-4, lead screw nut 5-5, lead screw nut seat 5-6.

[0024] Assist device 6,

[0025] Casing 10. Detailed Implementation

[0026] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. The description of the orientation of this utility model is as follows: Figure 1 Proceeding in the indicated direction, that is Figure 1 The up, down, left, and right directions shown are the same as the directions described. Figure 1 The direction the lawnmower is facing is considered forward (i.e., the direction it is moving forward), and the direction it is facing away from is considered forward. Figure 1The side to the left is the rear. The terms "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model or simplifying the description, not to indicate a specific orientation that must be present. In the description of this utility model, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] (Example 1)

[0028] See Figures 1 to 8 The electric adjustment mechanism of the lawnmower of this utility model includes a front wheel assembly 1, a rear wheel assembly 2, a connecting rod 3, a mounting base 4, a drive device 5, and an assist device 6.

[0029] The front wheel assembly 1 is existing technology. The front wheel assembly 1 includes a front wheel 1-1, a front wheel adjusting shaft 1-2, and a front wheel mounting plate 1-3. There are two front wheels 1-1 and two front wheel mounting plates 1-3. The two front wheel mounting plates 1-3 are respectively fixedly mounted on the left and right ends of the front wheel adjusting shaft 1-2, which is rotatably mounted on the front of the housing 10. The two front wheels 1-1 are rotatably mounted on their respective front wheel mounting plates 1-3, and are coaxially arranged, with the front wheels 1-1 and the front wheel adjusting shaft 1-2 being eccentrically positioned.

[0030] The rear wheel assembly 2 is existing technology. The rear wheel assembly 2 includes a rear wheel 2-1, a rear wheel adjusting shaft 2-2, and a rear wheel mounting plate 2-3. There are two rear wheels 2-1 and two rear wheel mounting plates 2-3. The two rear wheel mounting plates 2-3 are respectively fixedly mounted on the left and right ends of the rear wheel adjusting shaft 2-2, which is rotatably mounted on the rear part of the housing 10. The two rear wheels 2-1 are rotatably mounted on their respective rear wheel mounting plates 2-3, and are coaxially arranged, with the rear wheels 2-1 and the rear wheel adjusting shaft 2-2 being eccentrically positioned.

[0031] Link 3 is a single piece. Its front end is rotatably mounted on the right-side front wheel mounting plate 1-3, with its rotation axis forming a triangle with the rotation axis of the front wheel 1-1 and the axis of the front wheel adjusting shaft 1-2. The rear end of link 3 is rotatably mounted on the corresponding right-side rear wheel mounting plate 2-3, with its rotation axis forming a triangle with the rotation axis of the rear wheel 2-1 and the axis of the rear wheel adjusting shaft 2-2. Thus, by adjusting the vertical distance between the rotation axis of the front wheel 1-1 and the front wheel adjusting shaft 1-2 via link 3, and by adjusting the vertical distance between the rotation axis of the rear wheel 2-1 and the rear wheel adjusting shaft 2-2 via link 3, the height of the housing 10 can be changed, thereby adjusting the height of the lawnmower.

[0032] Mounting base 4 is fixedly mounted on housing 10. Mounting base 4 is provided with limiting groove 4-1, and connecting rod 3 is slidably mounted in limiting groove 4-1.

[0033] The drive unit 5 includes a drive motor 5-1, a connecting rod drive seat 5-2, a lead screw connecting seat 5-3, a lead screw 5-4, a lead screw nut 5-5, and a lead screw nut seat 5-6.

[0034] The drive motor 5-1 is fixedly mounted on the mounting base 4, and the connecting rod drive seat 5-2 is fixedly mounted on the front of the connecting rod 3. The drive motor 5-1 drives the connecting rod drive seat 5-2 to move back and forth, thereby driving the connecting rod 3 to move back and forth, thus adjusting the height of the lawnmower housing 10.

[0035] The connecting rod drive seat 5-2 has guide grooves 5-21 running vertically through it. The lead screw connecting seat 5-3 is slidably mounted on the connecting rod drive seat 5-2 via corresponding pins, which are positioned in the guide grooves 5-21 and guided vertically by the guide grooves 5-21. The front end of the lead screw 5-4 is fixedly mounted on the lead screw connecting seat 5-3. The lead screw nut seat 5-6 is rotatably mounted on the mounting seat 4 and is driven to rotate by the drive motor 5-1. The lead screw nut 5-5 is fixedly mounted on the front end of the lead screw nut seat 5-6 and screwed onto the lead screw 5-4. Thus, when the lead screw nut seat 5-6 rotates, it drives the lead screw nut 5-5 to rotate, causing the lead screw 5-4 to extend backward into or forward out of the lead screw nut seat 5-6.

[0036] The assist device 6 uses a tension spring. One end of the tension spring of the assist device 6 is fixedly mounted on the housing 10, and the other end is fixedly mounted on the connecting rod drive seat 5-2. It is used to generate a force to pull the connecting rod drive seat 5-2 backward. That is, it generates an auxiliary assisting effect when pulling the connecting rod 3 backward to adjust the height. It can reduce the power consumption of the drive motor 5-1 and protect the drive motor 5-1.

[0037] When the electric adjustment mechanism of the lawnmower of this utility model is in use, the drive motor 5-1 drives the lead screw 5-4 to extend backward into the lead screw nut seat 5-6 or forward out of the lead screw nut seat 5-6. This causes the lead screw connecting seat 5-3 to drive the connecting rod drive seat 5-2 to move backward and rise simultaneously, or to drive the connecting rod drive seat 5-2 to move forward and descend simultaneously, thereby completing the adjustment of the lawnmower height. The adjustment range is wide.

[0038] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electric adjustment mechanism for a lawnmower, comprising a front wheel assembly (1), a rear wheel assembly (2), and a connecting rod (3), characterized in that: It also includes a mounting base (4) and a drive unit (5); the mounting base (4) is fixedly mounted on the housing (10); the drive unit (5) includes a drive motor (5-1) and a connecting rod drive seat (5-2). The drive motor (5-1) is fixedly mounted on the mounting base (4), and the connecting rod drive seat (5-2) is fixedly mounted on the front of the connecting rod (3). The drive motor (5-1) drives the connecting rod drive seat (5-2) to move back and forth, thereby driving the connecting rod (3) to move back and forth and adjusting the height of the lawnmower.

2. The electric adjustment mechanism of the lawnmower according to claim 1, characterized in that: The drive device (5) also includes a lead screw connecting seat (5-3), a lead screw (5-4), a lead screw nut (5-5), and a lead screw nut seat (5-6); the connecting rod drive seat (5-2) is provided with a guide groove (5-21) that runs through it from left to right along the vertical direction; the lead screw connecting seat (5-3) is slidably mounted on the connecting rod drive seat (5-2) along the vertical direction; the front end of the lead screw (5-4) is fixedly mounted on the lead screw connecting seat (5-3); the lead screw nut seat (5-6) is rotatably mounted on the mounting seat (4), and is driven to rotate by the drive motor (5-1); the lead screw nut (5-5) is fixedly mounted on the front end of the lead screw nut seat (5-6) and screwed onto the lead screw (5-4).

3. The electric adjustment mechanism of the lawnmower according to claim 1, characterized in that: It also includes an assist device (6) that provides assistance when the lawnmower rises.

4. The electric adjustment mechanism of the lawnmower according to claim 3, characterized in that: The assist device (6) uses a tension spring. One end of the tension spring of the assist device (6) is fixed on the housing (10), and the other end is fixed on the connecting rod drive seat (5-2).

5. The electric adjustment mechanism of the lawnmower according to claim 1, characterized in that: The mounting base (4) is provided with a limiting groove (4-1), and the connecting rod (3) is slidably disposed in the limiting groove (4-1).

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