Trigger detection mechanism and wheel assembly including the mechanism

Abstract

The present invention relates to a trigger detection mechanism and a wheel assembly including the mechanism. The trigger detection mechanism includes a wheel fixing base, a first snap ring, a bracket, and a sensor. The first snap ring is movably disposed within the wheel fixing base. The bracket is rotatably connected to the wheel fixing base. The sensor is disposed at one end of the bracket away from the wheel fixing base. A magnetic member is disposed at the end of the bracket away from the wheel fixing base. When the first snap ring contacts the bracket and causes the bracket to rotate relative to the wheel fixing base to a first position, the sensor is triggered to achieve detection. By providing the first snap ring and the bracket, and rotatably disposing the bracket on the wheel fixing base, the first snap ring and the bracket are in a separated state when the detection is not triggered, so that when the wheel body rotates, it will not affect the bracket, thereby avoiding friction of the bracket during the rotation or movement of the wheel body, avoiding the problem of wear of structural members caused by friction, and effectively improving the service life of the wheel body.

Description

Technical Field

[0001] The present invention relates to the technical field of lawn mower equipment, and particularly to a trigger detection mechanism for a lawn mower and a wheel assembly including the mechanism. Background Art

[0002] A lawn mower is also known as a weed cutter, a grass shearer, a lawn trimmer, etc. A lawn mower is a mechanical tool for trimming lawns and vegetation. As an important part of a lawn mower, the wheel assembly undertakes the function of moving the lawn mower. Currently, the wheel body used for a lawn mower is fixed to the wheel axle. Since the wheel body not only needs to rotate on its own but also needs to move up and down along with the wheel axle, friction often occurs during the movement of the wheel body. After long-term friction, structural parts will be worn, and losses and dust will be generated, greatly reducing the service life of the wheel body. Summary of the Invention

[0003] Aiming at the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a trigger detection mechanism and a wheel assembly including the mechanism to solve one or more problems in the prior art.

[0004] To achieve the above purpose, the technical solution of the present invention is as follows:

[0005] A trigger detection mechanism, the trigger detection mechanism includes a wheel fixing seat, a first snap ring, a bracket, and a sensor. The first snap ring is movably arranged in the wheel fixing seat. The bracket is rotatably connected to the wheel fixing seat. The sensor is arranged at one end of the bracket away from the wheel fixing seat. A magnetic member is arranged at one end of the bracket away from the wheel fixing seat. When the first snap ring contacts the bracket and can make the bracket rotate relative to the wheel fixing seat to a first position, the sensor is triggered to achieve detection.

[0006] Further, at a position close to one end of the bracket away from the wheel fixing seat, a metal part mounting seat is further arranged on the wheel fixing seat, and a metal part that can be magnetically connected to the magnetic member is connected to the metal part mounting seat.

[0007] Further, the bracket includes a bracket body. A rotating shaft mounting part is arranged in the bracket body. A notch is formed at one end of the bracket body. A magnetic member mounting part is arranged at the other end of the bracket body. The magnetic member is mounted inside the magnetic member mounting part.

[0008] Further, the rotating shaft mounting part accounts for 1 / 3 - 1 / 5 of the total length of the bracket body.

[0009] Further, a first soft rubber is wrapped outside the first snap ring, and at least one first bulge is arranged outside the first soft rubber.

[0010] Correspondingly, the present invention further provides a wheel assembly, which includes the above-mentioned trigger detection mechanism and a wheel axle. A part of the wheel axle passes through the wheel fixing seat of the trigger detection mechanism and is connected to the first snap ring, and the other part of the wheel axle is connected to the wheel body.

[0011] Further, the wheel assembly further includes a second soft rubber connected to the wheel fixing seat, and the wheel axle passes through the second soft rubber.

[0012] Further, inside the second soft rubber, a first support pad, a first bearing, a second support pad and a second snap ring are respectively connected to the outside of the wheel axle.

[0013] Further, the first support pad extends in a direction away from the wheel fixing seat and covers the first bearing, the second support pad and the second snap ring.

[0014] Further, the second support pad extends in a direction close to the wheel fixing seat and covers the first bearing.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0016] (1) By setting the first snap ring and the bracket in the present invention, the bracket is rotatably arranged on the wheel fixing seat, and the first snap ring and the bracket are in a separated state when the detection is not triggered, so that when the wheel body rotates, it will not affect the bracket, thereby avoiding friction of the bracket during the rotation or movement of the wheel body, so as to avoid the wear problem of structural parts caused by friction, and effectively improve the service life of the wheel body.

[0017] (2) Further, near one end of the bracket away from the wheel fixing seat, a metal part mounting seat is further arranged on the wheel fixing seat, and a metal part that can be magnetically attracted to the magnetic part is connected to the metal part mounting seat. By magnetically connecting the metal part and the magnetic part, when the road surface where the lawn mower works is uneven and the lawn mower bumps, if magnetic connection is not used, the bracket will swing up and down and mis-trigger the sensor, thereby causing misoperation of the detection. When the metal part and the magnetic part are magnetically connected, it will further avoid the up and down swing of the bracket, thereby avoiding misdetection.

[0018] (3) Further, the rotating shaft mounting part accounts for 1 / 3 to 1 / 5 of the total length of the bracket body, so that the rotation center of the bracket is offset, and the bracket can trigger the sensor by lifting a very short distance, improving the detection efficiency.

[0019] (4) Further, by setting the second soft rubber, it can be avoided that when the wheel body slides down, grass clippings and dust suspended in the air adhere to the surface of the wheel axle. As the wheel axle rises, the grass clippings and dust will affect the rotation of the wheel axle. If the dust and grass clippings are not cleaned for a long time, it will cause jamming. The second soft rubber will be stretched as the wheel axle moves axially, effectively avoiding the entry of dust and grass clippings.

[0020] (V) Further, by providing the first support pad or the second support pad, the first bearing can be effectively wrapped, thereby preventing the first bearing from being affected by dust or grass clippings, and effectively improving the service life of the first bearing.

[0021] (VI) Further, the second bulge in the shock pad is a hollow structure, which can extend the contact time between the second support pad and the shock pad when vibration occurs, achieving a shock-absorbing effect. Description of the Drawings

[0022] Figure 1 Shows a schematic structural diagram of the trigger detection mechanism according to an embodiment of the present invention and a wheel assembly including the mechanism.

[0023] Figure 2 Shows a schematic structural diagram of a snap ring in the trigger detection mechanism according to an embodiment of the present invention and a wheel assembly including the mechanism.

[0024] Figure 3 Shows an isometric view of a front wheel seat in the trigger detection mechanism according to an embodiment of the present invention and a wheel assembly including the mechanism.

[0025] Figure 4 Shows a schematic structural diagram of a bracket in the trigger detection mechanism according to an embodiment of the present invention and a wheel assembly including the mechanism.

[0026] Figure 5 Shows a schematic connection structure diagram of a support pad and a wheel axle in the trigger detection mechanism according to an embodiment of the present invention and a wheel assembly including the mechanism.

[0027] Figure 6 Shows a schematic structural diagram of a bearing fixing assembly in the trigger detection mechanism according to an embodiment of the present invention and a wheel assembly including the mechanism.

[0028] Figure 7 Shows a schematic structural diagram of a shock pad in the trigger detection mechanism according to an embodiment of the present invention and a wheel assembly including the mechanism.

[0029] Figure 8 Shows a schematic installation diagram of a sensor in the trigger detection mechanism according to an embodiment of the present invention and a wheel assembly including the mechanism.

[0030] Figure 9 Shows a schematic structural diagram of a wheel body in a first perspective in the trigger detection mechanism according to an embodiment of the present invention and a wheel assembly including the mechanism.

[0031] Figure 10 Shows a schematic structural diagram of a wheel body in a second perspective in the trigger detection mechanism according to an embodiment of the present invention and a wheel assembly including the mechanism.

[0032] Reference numerals in the drawings: 1, wheel axle; 101, limiting part; 2, shaft sleeve; 3, wheel fixing seat; 300, fixing seat body; 301, first protruding part; 302, opening; 303, shaft hole; 304, second protruding part; 4, first snap ring; 5, first soft rubber; 500, first soft rubber body; 501, first bulge; 6, rotating shaft; 7, bracket; 700, bracket body; 701, rotating shaft mounting part; 702, rotating shaft mounting hole; 703, notch; 704, magnetic part mounting part; 8, sensor; 9, magnetic part; 10, metal part; 11, metal part mounting seat; 12, second soft rubber; 13, wheel body; 1300, first wheel shell; 1301, second wheel shell; 1302, pressing plate; 1303, third snap ring; 1304, seal; 1305, second bearing; 14, first support pad; 15, first bearing; 16, second support pad; 17, shock pad; 171, second bulge; 18, second snap ring; 19, housing; 20, sensor mounting seat. Detailed implementation manners

[0033] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the trigger detection mechanism proposed by the present invention and the wheel assembly including the mechanism will be further described in detail below with reference to the accompanying drawings and specific implementation manners. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are in a very simplified form and all use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the implementation manners of the present invention. In order to make the objectives, features and advantages of the present invention more obvious and understandable, please refer to the accompanying drawings. It should be noted that the structures, scales, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the objectives that can be achieved, should still fall within the scope covered by the technical content disclosed by the present invention.

[0034] Embodiment 1:

[0035] Please refer to Figure 1 , the bearing fixing structure includes a wheel axle 1, a first bearing 15 connected to the wheel axle 1, and a second snap ring 18. A dust-proof structure is also connected to the outside of the first wheel axle 1, and a part of the dust-proof device wraps the first bearing 15 and the second snap ring 18.

[0036] Specifically, please continue to refer to Figure 1, the dust-proof structure includes a first support pad 14 and a second support pad 16. The first support pad 14 is provided at the first end of the first bearing 15, and the second support pad 16 is provided at the second end of the first bearing 15. The first support pad 14 has a first wheel shaft mounting hole 1401 for the wheel shaft 1 to pass through, and a part of the first support pad 14 extends in the direction close to the second snap ring 18. Specifically, in the bearing fixing structure of the first embodiment, the first end refers to the upper end of the first bearing 15, and the second end refers to the lower end of the first bearing 15.

[0037] Further, a limiting portion 101 is provided on the outer side of the wheel shaft 1. The limiting portion 101 protrudes along the outer side of the wheel shaft 1 and is used to limit the installation position of the second snap ring 18 to play a limiting role.

[0038] Further, please refer to Figure 1 and Figure 2 , the first support pad 14 extends 3 - 10 mm in the direction close to the second snap ring 18. This extension can make the first bearing 15, the second support pad 16, and the second snap ring 18 all be wrapped inside the first support pad 14. Dust or grass clippings are blocked outside the second snap ring 18 under the influence of the second snap ring 18 below the first support pad 14, thereby avoiding the first bearing 15 from being affected by grass clippings and dust and effectively protecting the service life of the first bearing 15.

[0039] Preferably, the first support pad 14 and the second support pad 16 are any one of plastic parts, metal parts, or metal - plastic hybrid parts.

[0040] Further, please continue to refer to Figure 1 and Figure 3 , since the wheel shaft 1 slides up and down, each descent and reset of the wheel body 13 will cause vibration of the lawn mower. Therefore, between the second snap ring 18 and the second support pad 16, a shock pad 17 is also connected to the outer side of the wheel shaft 1. The shock pad 17 includes a shock pad body 170. A second wheel shaft mounting hole 172 is formed in the shock pad body 170. At least one second bulge 171 is provided on the outer side of the shock pad body 170. The second bulge 171 is a hollow structure. The second bulge 171 is provided on the upper surface and the lower surface of the shock pad 17. The inside of the second bulge 171 is a hollow structure and extends along the axial direction of the shock pad body 170. Since the second bulge 171 is a hollow structure, when vibration occurs, the second support pad 16 will contact the second bulge 171, and the contact time between the second support pad 16 and the shock pad 17 is extended through the second bulge 171, thereby achieving a shock - absorbing effect.

[0041] Correspondingly, in other embodiments of the present invention, the second bump 171 may also be disposed on the upper surface or the lower surface of the shock pad body 170, as long as the shock absorption effect can be achieved, and the present invention does not make further limitations in this regard.

[0042] Correspondingly, the present invention further provides a wheel assembly, which includes the above-mentioned bearing fixing structure, a wheel fixing seat 3 and a wheel body 13. The wheel shaft 1 sequentially passes through the bearing fixing structure and the wheel fixing seat 3 and is connected to the wheel body 13. Specifically, the wheel shaft 1 passes through a first snap ring 4 and is connected to a shaft sleeve 2, and the shaft sleeve 2 is fixed to the upper half of the wheel fixing seat 3. The first snap ring 4 is movably disposed within the wheel fixing seat 3. The bracket 7 is rotatably connected to the wheel fixing seat 3. A sensor 8 is disposed at one end of the bracket 7 away from the wheel fixing seat 3. A magnetic member 9 is disposed at one end of the bracket 7 away from the wheel fixing seat 3. When the first snap ring 4 contacts the bracket 7 and enables the bracket 7 to rotate relative to the wheel fixing seat 3 to a first position, the sensor is triggered to achieve detection.

[0043] Further, the bottom of the wheel fixing seat 3 has a second protrusion 304, and the second protrusion 304 is connected to a second soft rubber 12 by interference fit. The center of the second soft rubber 12 has a hole through which the wheel shaft 1 passes out. The second soft rubber 12 has elasticity. When the wheel shaft 1 moves axially up and down, the second soft rubber 12 is stretched as the wheel shaft 1 moves, and when the wheel shaft 1 rotates, the second soft rubber 12 remains fixed and does not rotate. Therefore, the second soft rubber 12 is provided to prevent grass clippings and dust suspended in the air from adhering to the surface of the wheel shaft 1 and being brought in as the wheel shaft 1 rises and affecting the rotation of the wheel shaft 1 when the wheel body 13 slides down, so as to avoid jamming of the first bearing 15 within the second soft rubber 12 after long-term use and further avoid the failure of the wheel body 13.

[0044] Further, please refer to Figure 1 and Figure 4 , the wheel fixing seat 3 is fixed to the back surface of the housing 19, and the sensor 8 is connected to the housing 19 through a sensor mounting seat 20.

[0045] Further, please refer to Figure 7 and Figure 8 , the first snap ring 4 is movably disposed within the wheel fixing seat 3 through the wheel shaft 1. A first soft rubber 5 is wrapped around the outside of the first snap ring 4. The first soft rubber 5 includes a first soft rubber body 500, and at least one first bump 501 is disposed on the outside of the first soft rubber body 500. The first bump 501 is used for shock absorption. The bracket 7 is rotatably connected to the wheel fixing seat 3. A sensor 8 is disposed at one end of the bracket 7 away from the wheel fixing seat 3. A magnetic member 9 is disposed at one end of the bracket 7 away from the wheel fixing seat 3. When the first snap ring 4 contacts the bracket 7 and enables the bracket 7 to rotate relative to the wheel fixing seat 3 to a first position, the sensor is triggered to achieve detection.

[0046] Further, please continue to refer to Figure 7 and Figure 8 , the wheel fixing seat 3 includes a fixing seat body 300 and a first protruding portion 301 integrally connected to the fixing seat body 300. The center of the fixing seat body 300 has a shaft hole 303 through which the wheel shaft 1 can penetrate. The first protruding portion 301 is a cylindrical structure, and an opening 302 is provided on the cylindrical structure. On the left and right sides of the opening 302, holes for connecting the rotating shaft 6 are respectively provided on both sides of the first protruding portion 301. The first protruding portion 301 on the left and right sides of the opening 302 can effectively limit the movement of the bracket 7 in the left and right directions, thereby avoiding interference between the bracket 7 and other structures and causing wear.

[0047] Further, please continue to refer to Figure 7 and Figure 8 , at one end of the bracket 7 away from the wheel fixing seat 3, a metal part mounting seat 11 is further provided on the wheel fixing seat 3. A metal part 10 that can be magnetically connected to the magnetic part 9 is connected to the metal part mounting seat 11. The metal part 10 can be inserted into the metal part mounting seat 11. Specifically, a mounting hole (not marked in the figure) for inserting the metal part 10 is provided on the metal part mounting seat 11. Preferably, in the trigger detection mechanism of the first embodiment, the metal part 10 preferably uses a screw. By magnetically connecting the metal part 10 with the magnetic part 705, when the road surface where the lawn mower works is uneven and the lawn mower bumps, if magnetic connection is not used, the bracket 7 will swing up and down and mis-trigger the sensor 8, thereby causing misoperation of the detection. When the metal part 10 is magnetically connected to the magnetic part 9, it will further prevent the bracket 7 from swinging up and down, thereby avoiding misdetection.

[0048] Of course, in other embodiments of the present invention, the metal part 10 can also adopt any structure other than a screw, such as a metal block or a metal rod made of a metal material, as long as it can achieve magnetic connection with the magnetic part 9. In this regard, the present invention does not make further limitations.

[0049] Further, please refer to Figure 7 and Figure 10 , the bracket 7 includes a bracket body 700. A rotating shaft mounting portion 701 is provided in the bracket body 700. A rotating shaft mounting hole 702 is provided in the rotating shaft mounting portion 701. The rotating shaft 6 is mounted in the rotating shaft mounting hole 702. Both ends of the rotating shaft 6 extend out of the rotating shaft mounting portion 701 and are connected to the holes on both sides of the opening 302. A notch 703 is provided at one end of the bracket body 700. The notch 703 is used to contact the first soft rubber 5 outside the first snap ring 4. A magnetic part mounting portion 704 is provided at the other end of the bracket body 700. The magnetic part 9 is mounted inside the magnetic part mounting portion 704.

[0050] Further, the rotating shaft mounting portion 701 accounts for 1 / 3 to 1 / 5 of the total length of the bracket body 700. This design makes the rotation center of the bracket 7 not located at the center of the bracket body 700, but offset towards the center of the bracket body 700. By offsetting the rotation center, the bracket 7 can trigger the sensor 8 as long as it is lifted a very short distance (e.g., 1 - 2 mm), thereby realizing the detection of the lifting of the wheel axle 1.

[0051] Further, please refer to Figure 5 、 Figure 6 and Figure 7 . The wheel body 13 further includes a first wheel shell 1300 and a second wheel shell 1301 which are connected to each other. The first wheel shell 1300 and the second wheel shell 1301 are also respectively connected to the wheel axle 1. Between the first wheel shell 1300 and the second wheel shell 1301, a third snap ring 1303 and a pressing plate 1302 for fixing the second bearing 1305 are further arranged on the wheel axle 1. The second bearing 1305 is connected to the wheel axle 1 and is located inside the wheel body 13. To ensure the sealing of the wheel body 13, a sealing member 1304 is further arranged on the second wheel shell 1301. The sealing member 1304 is preferably made of wool felt.

[0052] Please refer to Figure 7 , the specific working process of the present invention is as follows:

[0053] In the normal state, the bracket 7 is always magnetically connected to the metal part 10 under the influence of the magnetic part 705 and is in an inclined state. When the lawn mower bumps on the road surface, the wheel fixing base 3 and the bracket 7 are lifted together with the lawn mower. The first snap ring 4 remains stationary relative to the wheel axle 1 all the time. When the bracket 7 and the wheel fixing base 3 are lifted to a certain height, the first snap ring 4 and the first soft rubber 5 come into contact with the notch 703 of the bracket 7 and drive the bracket 7 to rotate. When the end of the bracket 7 away from the wheel fixing bracket 3 rotates to align with the sensor 8, the sensor detects a signal under the influence of the magnetic part 705, triggering the lifting detection of the lawn mower wheel body 13.

[0054] Embodiment 2:

[0055] Most of the structures of Embodiment 2 are the same as those of Embodiment 1. The difference is that the dust-proof structure further includes a third support pad 21. Please refer to Figure 10 . The third support pad 21 is arranged at the second end of the first bearing 15. A part of the third support pad 21 extends in the direction away from the second snap ring 18. This extension enables the third support pad 21 to wrap the first bearing 15, which can also prevent grass clippings and dust from entering the first bearing 15.

[0056] Correspondingly, the center of the third support pad 21 also has a hole through which the axle 1 can pass. The diameter of the hole formed in the center of the third support pad 21 has a clearance fit with the axle 1. This clearance is small and can also prevent grass clippings and dust from entering.

[0057] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0058] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. Trigger detection mechanism, characterized in that: The trigger detection mechanism includes a wheel fixing base, a first snap ring, a bracket, and a sensor. The first snap ring is movably disposed within the wheel fixing base. The bracket is rotatably connected to the wheel fixing base. The sensor is disposed at one end of the bracket away from the wheel fixing base. A magnetic member is disposed at the end of the bracket away from the wheel fixing base. When the first snap ring contacts the bracket and causes the bracket to rotate relative to the wheel fixing base to a first position, the sensor is triggered to achieve detection. Near the end of the bracket away from the wheel fixing base, a metal part mounting base is further provided on the wheel fixing base, and a metal part that can be magnetically connected to the magnetic member is connected to the metal part mounting base. The bracket includes a bracket body. A rotating shaft mounting portion is provided in the bracket body. A notch is formed at one end of the bracket body. A magnetic member mounting portion is provided at the other end of the bracket body. The magnetic member is mounted inside the magnetic member mounting portion. A first soft rubber is wrapped around the outside of the first snap ring, and at least one first bulge is provided on the outside of the first soft rubber.

2. The trigger detection mechanism according to claim 1, wherein: The rotating shaft mounting portion accounts for 1 / 3 to 1 / 5 of the total length of the bracket body.

3. Wheel assembly, characterized in that: It includes the trigger detection mechanism according to any one of claims 1 to 2 and a wheel shaft. A part of the wheel shaft passes through the wheel fixing base of the trigger detection mechanism and is connected to the first snap ring, and the other part of the wheel shaft is connected to a wheel body.

4. The wheel assembly according to claim 3, wherein: The wheel assembly further includes a second soft rubber connected to the wheel fixing base, and the wheel shaft passes out of the second soft rubber.

5. The wheel assembly according to claim 4, wherein: Inside the second soft rubber, a first support pad, a first bearing, a second support pad, and a second snap ring are respectively connected to the outside of the wheel shaft.

6. The wheel assembly according to claim 5, wherein: The first support pad extends in a direction away from the wheel fixing base and covers the first bearing, the second support pad, and the second snap ring.

7. The wheel assembly according to claim 5, wherein: The second support pad extends in a direction close to the wheel fixing base and covers the first bearing.

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