CN114711018A - Grass cutter - Google Patents

Abstract

The invention provides a mower which comprises a chassis, a cutting assembly and a power device, wherein the cutting assembly is arranged below the chassis, the power device is used for providing power for the cutting assembly, the cutting assembly comprises a first blade and a second blade, the power device drives the first blade and the second blade to rotate through a transmission assembly, the first blade and the second blade respectively form a cutting area when rotating, a grass guiding part is arranged between the two cutting areas, and the grass guiding part is used for guiding grass chopping from one cutting area to the other cutting area. The grass guiding part of the invention has the function of guiding the grass, realizes the purpose of intensively discharging the grass in the same area by the grass, and improves the grass discharging effect.

Description

Grass cutter

Technical Field

The present invention relates to the field of gardening tools, and more particularly to a lawnmower including a plurality of cutting blades.

Background

Among direct current lithium battery garden lawn mowers, 13 inches to 20 inches lawn mowers are more on the market, and when users with large-area lawns or who want to spend less time cleaning the lawns are encountered, the lawn mowers with the sizes cannot be sufficient.

And the lithium battery double-blade mower adopts two small-size mowing blades, so that the mowing efficiency is improved, and the mowing time is saved. The mower takes a lithium battery as power energy, and drives a gear set by a motor and simultaneously drives a left group of blades and a right group of blades to mow; the lithium battery mower is energy-saving and efficient, large in cutting area, high in grass chopping rate and low in noise.

However, since the double-blade mower has two cutting areas, new challenges are brought to the collection and discharge of cut grass.

Disclosure of Invention

The invention provides a multi-cutting-blade mower which is more beneficial to grass discharge.

This lawn mower includes chassis, cutting assembly, power device, the cutting assembly is installed in the below on chassis, power device is used for the cutting assembly provides power, the cutting assembly includes first blade and second blade, power device passes through the drive assembly drive first blade with the second blade rotates, first blade with the second blade forms a cutting area respectively when rotatory, two the middle department of cutting area installs leads grass portion, it is used for guiding garrulous grass from one cutting area is to another cutting area. According to the scheme, multiple times of cutting of the chopped grass are achieved, and the chopped grass is guided to the same area to be concentrated and then is discharged from the grass outlet.

According to a further technical scheme, the grass guiding part comprises a grass guiding surface, the grass guiding surface faces to a rotating shaft of the cutting area, the grass is cut out, an included angle alpha is formed between a parallel line of a connecting line of a first blade rotating center and a second blade rotating center and the grass guiding surface, and the included angle alpha is 0-30 degrees. The scheme further limits the included angle, and improves the grass guiding effect.

According to a further technical scheme, the grass guiding part further comprises a blocking surface, the blocking surface is connected with the grass guiding surface and faces the rotating shaft of the cutting area, and the grass is guided into the rotating shaft. This arrangement restricts the chopped grass within the area into which it is introduced, facilitating its discharge from the chassis.

According to a further technical scheme, the mower is provided with two grass guiding parts, the two grass guiding parts are arranged oppositely, and the two grass guiding surfaces are arranged oppositely and parallelly. The mutual guidance of the partial grass chopping in the two cutting areas is realized by the scheme, and the grass chopping effect is further improved.

According to a further technical scheme, a grass outlet is formed in the side edge of the mower on the chassis and is located in the cutting area where the grass clippings are guided into.

According to the further technical scheme, a first cutting circle formed by the rotation of the first blade is the cutting area, and a second cutting circle formed by the rotation of the second blade is the cutting area; the grass guiding surface guides the chopped grass from the second cutting circle to the first cutting circle, and the grass guiding surface is at least partially positioned above the second cutting circle.

According to a further technical scheme, the first cutting circle and the second cutting circle are in the same plane and partially overlapped, and the grass guiding surface is located above at least part of the overlapped area.

According to a further technical scheme, the transmission assembly comprises a first gear, a second gear and a third gear, wherein the second gear and the third gear are driven by the first gear, and are symmetrically arranged relative to the first gear teeth; the power device is connected with the first gear through a first rotating shaft and is used for driving the first gear to rotate; the first blade and the second blade rotate in the same direction and are connected to the second gear and the third gear respectively. The scheme realizes the synchronous and equidirectional rotation of the two blades by using gear transmission.

According to the further technical scheme, the first blade is connected with the second gear through a second rotating shaft, and the second gear rotates to drive the first blade to rotate; the second blade is connected with the third gear through a third rotating shaft, and the third gear rotates to drive the second blade to rotate.

According to a further technical scheme, the transmission assembly comprises a fourth gear and a fifth gear, the fourth gear is meshed with the first gear and the second gear respectively, and the fifth gear is meshed with the first gear and the third gear respectively; the transmission assembly is arranged to be in a straight line shape or a V-shaped structure.

The invention has the beneficial effects that: the lawn mower has a plurality of cutting regions, and the grass guiding part is arranged to guide the chopped grass to the same cutting region, and the chopped grass can be concentrated on the discharging chassis in the cutting region, so that the grass discharging effect is improved, and meanwhile, the grass chopping effect is also improved.

Drawings

FIG. 1 is a perspective view of an embodiment of a lawn mower.

FIG. 2 is a bottom view of an embodiment of a lawnmower.

FIG. 3 is a schematic view of a power plant and transmission assembly of an embodiment of a lawnmower.

FIG. 4 is a perspective view of a portion of the components of an embodiment of the mower.

Fig. 5 is a front plan view of a portion of the components of the mower embodiment of fig. 4.

FIG. 6 is a perspective view of an embodiment of a grass guiding portion.

Fig. 7 is a test chart of air flow simulation in the chassis without the grass guide.

Fig. 8 is a test chart of air flow simulation in a chassis provided with a grass guide.

Description of reference numerals:

1-bottom disc, 11-side wall, 12-top surface, 13-grass discharge port, 14-grass collection port;

2-cutting assembly, 21-first blade, 22-second blade;

3-transmission assembly, 31-first gear, 32-second gear, 33-third gear, 34-fourth gear, 35-fifth gear, a 1-first rotation axis, a 2-second rotation axis, A3-third rotation axis;

4-walking wheels, 5-grab bars, 6-side row covers, 7-control components, 8-grass collecting bags and 9-power devices;

10-grass guiding part, 101-grass guiding surface and 102-resisting surface.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1 and 2, an embodiment of a lawnmower includes a chassis 1, a cutting assembly 2, a drive assembly 3, road wheels 4, a grab bar 5, a side row cover 6, and a control assembly 7. The chassis 1 is substantially oval and is composed of a side wall 11 and a top surface 12, wherein the side edge of the top surface 12 extends downwards to form the side wall 11, and the side wall 11 encloses an open accommodating space. Four road wheels 4 are divided into two groups and are respectively arranged on the front side and the rear side of the chassis 1, and the transmission component 3 is arranged on the top surface 12 of the chassis 1. The cutting assembly 2 is mounted in a receiving space below the chassis 1, and the cutting assembly 2 comprises two blades, a first blade 21 and a second blade 22. The grab bar 5 is installed at the rear side of chassis 1, and control assembly 7 is installed on grab bar 5, and control assembly 7 is used for controlling lawn mower cutting rotational speed, walking speed etc. and control assembly 7 can adopt prior art, and no longer give consideration to here.

The side wall 11 of the chassis is opened to form a grass discharge port 13, the side row cover 6 is arranged at the grass discharge port 13, and cut grass can be discharged outside the chassis 1 from the grass discharge port 13. The grass mower is also provided with a grass collecting bag 8, the grass collecting bag 8 is arranged at the rear part of the chassis 1, a grass collecting channel is arranged between the accommodating space of the chassis 1 and the grass collecting bag 8, and crushed grass and the like enter the grass collecting bag 8 through the grass collecting channel in the accommodating space. Meanwhile, the grass mower with the side row and grass collecting functions can provide more choices for users, can close the grass discharge openings 13 of the side row for grass collection, and can also be opened to directly scatter grass on a lawn.

The mower further comprises a power device 9, and the power device 9 is arranged above the transmission assembly 3. The power device 9 of the embodiment of the mower is an electric motor, and obviously, the power device 9 can also be a fuel power head. The power device 9 is at least used for driving the cutting assembly 2 to rotate, and the power device 9 is required to drive the cutting assembly 2 through the transmission assembly 3.

As shown in fig. 3, the transmission assembly 3 includes five gears, and the five gears have the same specification and are distributed in a V shape as a whole. The middle gear of the "V" shape is a first gear 31, and the first gear 31 is connected with a motor through a first rotating shaft a1 to form a driving wheel, and is directly driven by the motor to rotate. The other four gears are divided into two groups, symmetrically arranged on two sides of the first gear 31, the two gears far away from the first gear 31 are respectively a second gear 32 and a third gear 33, the second gear 32 is connected with the first blade 21 through a second rotating shaft A2, the third gear 33 is connected with the second blade 22 through a third rotating shaft A3, and the second gear 32 and the third gear 33 are driven wheels. An idle gear is a fourth gear 34 arranged between the first gear 31 and the second gear 32, an idle gear is a fifth gear 35 arranged between the first gear 31 and the third gear 33, when the first gear 31 is driven to rotate, the second gear 32 and the third gear 33 are also driven to rotate synchronously and in the same direction, so that the first blade 21 and the second blade 22 are driven to rotate synchronously and in the same direction. Obviously, depending on the size of the blade or other factors, no idler pulley or more idler pulleys may be provided; in addition, the transmission assembly 3 may also be arranged in other symmetrical structures, such as a straight line, where the first gear 31 is arranged in the middle, and the second gear and the third gear are respectively arranged at two ends.

As shown in fig. 4, the lawn mower includes a grass discharge opening 13 for discharging grass sideways, and when the lawn mower is normally moving forward, the grass discharge opening 13 is located on the right side of the moving direction, that is, cut grass and the like are discharged from the right side of the chassis 1 and spread on the lawn. Referring to fig. 5, when the rotation direction of the cutting assembly 2 is seen from the perspective of fig. 5, and an arc arrow in the figure is the rotation direction of the blades, the first blade 21 and the second blade 22 both rotate counterclockwise, the first blade 21 rotates counterclockwise to form a first cutting circle, i.e., a cutting area, and the second blade 22 rotates counterclockwise to form a second cutting circle, i.e., another cutting area.

The cut grass will be thrown to the side wall 11 of the chassis by centrifugal force and discharged out of the chassis 1 through the grass discharge port 13. In the embodiment of the mower, the side wall 11 of the chassis is provided with the grass collecting opening 14 besides the grass discharge opening 13, the grass discharge opening 13 and the grass collecting opening 14 are grass outlets and are arranged near the first cutting circle, and the grass outlets are not arranged near the second cutting circle. In order to better discharge the grass cut off in the second cutting circle from the grass discharge opening 13 and/or the grass collecting opening 14, the grass mower is also provided with a grass guiding part 10 in the chassis 1, and the cut grass cut off in the second cutting circle is guided out of the cutting area where the second cutting circle is located and enters the cutting area where the first cutting circle is located under the guidance of the grass guiding part 10, so that the grass is favorably discharged out of the chassis 1 through the grass discharge opening 13 and/or the grass collecting opening 14. In addition, after the grass chopping is guided into the first cutting circle, the first blade 21 can also cut the grass chopping for the second time, and the grass chopping effect is improved.

The grass guide 10 is disposed at the middle of the first cutting circle and the second cutting circle and is fixedly mounted on the side wall 11 of the chassis. As shown in fig. 5 and 6, the grass guiding portion 10 is integrally formed by a sheet metal part, a main body of the grass guiding portion 10 is composed of a grass guiding surface 101 and a resisting surface 102, two ends of the grass guiding portion 10 are fixed on the side walls 11 of the chassis 1 by fasteners, the width of the sheet metal part is approximately the same as the height of the side walls 11, and the grass guiding portion 10 is approximately perpendicular to the top surface 12 of the chassis. The grass-guiding surface 101 is a plane that faces the third rotation axis a3, which is the rotation axis of the cut grass led out from the cut area, and extends from the side wall 11 obliquely downward toward the other cut grass-guiding cut area. The grass clippings thrown from the second cutting circle onto the grass guiding surface 101 will be guided to the cutting area where the first cutting circle is located, i.e. the grass guiding surface 101 will guide the grass clippings from one cutting area to another.

The grass guiding surface 101 is bent and then extends obliquely upwards to the side wall 11 to form a resisting surface 102, and the resisting surface 102 faces towards a rotating shaft of a cutting area into which the grass is guided, namely, a rotating shaft of the first cutting circle, namely a second rotating shaft A2, so as to resist the grass thrown out of the first cutting circle and prevent the grass from entering the cutting area where the second cutting circle is located; meanwhile, the chopped grass thrown out from the first cutting circle moves anticlockwise in a complete circular air channel, so that the chopped grass is discharged from the grass outlet, and the grass discharging efficiency is improved. The grass-guiding surface 101 is made of sheet metal parts, and the smooth surface is favorable for guiding the grass, obviously, the grass-guiding surface 101 can be made of other materials. Alternatively, the grass-guiding portion may be stamped and formed directly from the side wall 11 of the chassis, rather than being mounted on the side wall as a separate component.

As shown in FIG. 5, L2 is a parallel line L1, L1 is a line connecting the centers of the two blade rotation axes, the grass-guiding surface 101 is substantially perpendicular to the top surface 12 of the chassis, and the angle between the grass-guiding surface 101 and the parallel line L2 is α. Fig. 7 and 8 are diagrams showing the simulation test effect of the air flow in the chassis 1, wherein black dots in the two diagrams are air flows, and other parameters of the two tests are the same, except that the grass guiding part 10 is arranged, the two blades rotate clockwise, and the grass outlet is arranged at the right blade. Fig. 7 is a bottom plate without a grass guiding part, the side wall of the bottom plate at the middle of two cutting areas is in a circular arc shape, the circular arc and the cutting circle of the blade are concentric circles, and the cutting circle is formed by clockwise rotation of the blade. Fig. 8 shows a chassis provided with a grass guiding portion, the grass guiding surface 101 facing the rotation axis of the left blade. Comparing the air flow density at the middle of the two cutting areas in fig. 7 and 8, it is clear that the air flow density at this point in fig. 8 is relatively greater and that there is relatively more air flow from the left blade to the right blade, although fig. 7 is an enlarged view of this point.

Furthermore, under the condition that other conditions are not changed, the effect of guiding the grass clippings is different due to the difference of the degree of the included angle alpha. Combining the test data of the air speed and the air volume in the chassis as shown in the following table 1, the test conditions of the data table are as follows: keeping the rotating speed of the blade constant at the normal mowing rotating speed, measuring an air quantity value at a grass outlet of the chassis, wherein the larger the air quantity value is, the higher the grass discharging efficiency is; wind speed was measured at the grass-guiding surface 101 and at the circular arc-shaped side wall, where a larger value of wind speed indicates a better flowability of the grass clippings. The blade diameter of this test is 340mm, and the rotational speed of blade is 3000 rpm, and the wind channel cross-section (i.e. the cross-section of grass-outlet) is the 100 mm.

Table 1 shows that the wind speed and the wind volume are gradually increased in the process of increasing the included angle from 0 degree to 15 degrees; after the temperature exceeds 15 ℃, the wind speed and the wind volume are gradually reduced. Comprehensively judging according to the wind speed and wind quantity data corresponding to different degrees of the included angle alpha, wherein when the included angle alpha is larger than 0 degree and smaller than 30 degrees, the grass guiding effect of the grass guiding part is still good; when the included angle alpha is larger than 11 degrees and smaller than 17 degrees, the grass guiding effect of the grass guiding part is better; especially, when the included angle alpha is 15 degrees, the wind speed value and the wind quantity value reach the highest values, and the grass guiding effect of the grass guiding part is the best.

TABLE 1

Included angle alpha (degree)	Wind speed (m/s)	Wind speed (m/min)	Angle alpha (degree)	Wind speed (m/s)	Wind rate (m)
						0	4.240	5.120	23	4.187	5.440
1	4.293	5.184	24	4.081	5.344
						2	4.346	5.248	25	4.028	5.216
3	4.399	5.312	26	3.975	5.152
						4	4.452	5.440	27	3.922	4.992
5	4.505	5.504	28	3.869	4.800
						6	4.558	5.568	29	3.816	4.672
7	4.611	5.632	30	3.763	4.544
						8	4.664	5.696	31	3.710	4.480
9	4.717	5.760	32	3.657	4.416
						10	4.770	5.824	33	3.604	4.352
11	4.823	5.888	34	3.498	4.224
						12	4.876	5.952	35	3.445	4.160
13	4.929	6.016	36	3.392	4.096
						14	4.982	6.016	37	3.339	4.032
15	5.035	6.080	38	3.286	3.968
						16	4.982	6.016	39	3.233	3.904
17	4.876	5.888	40	3.180	3.840
						18	4.770	5.856	41	3.127	3.776
19	4.638	5.792	42	3.074	3.712
						20	4.585	5.728	43	3.021	3.648
21	4.526	5.632	44	2.968	3.584
						22	4.346	5.568	45	2.915	3.520

In addition, in order to increase the grass guiding effect, the grass guiding surface 101 is located at least partially above the second cutting circle in the vicinity of the side wall 11, and the grass guiding surface 101 extends at least partially above the first cutting circle. It is clear that the top described here is only relative to the perspective of fig. 5. In another embodiment of the mower, the first cutting circle and the second cutting circle are in the same plane and partially overlap, wherein the first blade 21 and the second blade 22 can be mounted on respective rotating shafts perpendicular to each other, and do not interfere because the two blades rotate synchronously, and the grass guiding surface 101 in this embodiment is located above the at least partially overlapping area.

In another embodiment of the mower, two grass guiding portions are provided, the first grass guiding portion is the grass guiding portion 10 described above, and the second grass guiding portion is installed on the side of the grass collecting opening 14 of the chassis side wall 11 as shown in fig. 5. The two grass guiding parts have the same structure, but different installation positions, the installation positions of the two grass guiding parts are oppositely arranged, and the grass guiding surface of the second grass guiding part is parallel to the grass guiding surface 101 of the first grass guiding part 10. The addition of the second grass-guiding part is beneficial to guiding the chopped grass which is not discharged from the grass discharge opening 13 and/or the grass-collecting opening 14 into another cutting area again for cutting again, and then guiding the chopped grass back into the cutting area provided with the grass-discharging opening by the first grass-guiding part 10. This scheme has set up two and has led grass portion, and partial garrulous grass can discharge the lawn mower after cutting many times, has further promoted garrulous grass effect.

It should be noted that the above technical solutions are not limited to the push mower shown in the drawings, and may be applied to other types of riding mowers and the like on the premise of meeting requirements. In addition, in the mower comprising more than two cutting areas, the grass guiding part can be arranged between every two cutting areas and used for guiding the chopped grass to be concentrated in one cutting area.

The above-mentioned embodiments are merely preferred embodiments of the present application, which are not intended to limit the present application in any way, and it will be understood by those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present application.

Claims (10)

1. A lawn mower comprising a chassis, a cutting assembly mounted beneath the chassis, a power means for powering the cutting assembly,

it is characterized in that the cutting component comprises a first blade and a second blade, the power device drives the first blade and the second blade to rotate through a transmission component,

the first blade and the second blade respectively form a cutting area when rotating, a grass guiding part is installed in the middle of the two cutting areas, and the grass guiding part is used for guiding grass chopping from one cutting area to the other cutting area.

2. A lawnmower as claimed in claim 1 wherein said grass guiding portion comprises a grass guiding surface facing the axis of rotation of the cutting area from which grass clippings are derived, and wherein a line parallel to the line joining the centres of rotation of the first and second blades makes an angle α with the grass guiding surface, said angle α being in the range 0 to 30 degrees.

3. A lawnmower as claimed in claim 2, wherein the grass-guiding portion further comprises a stop surface, the stop surface being connected to the grass-guiding surface and facing the axis of rotation of the cutting zone into which the grass clippings are directed.

4. A lawnmower as claimed in claim 2, wherein said mower is fitted with two said grass guiding portions, the two said grass guiding portions being opposed and the two said grass guiding surfaces being opposed and parallel.

5. A lawnmower as claimed in claim 1, wherein the chassis is provided with a grass outlet at a side of the mower, the grass outlet being located at the cutting zone into which the grass clippings are directed.

6. The mower of claim 2 wherein a first cutting circle formed by the rotation of the first blade is the cutting zone and a second cutting circle formed by the rotation of the second blade is the cutting zone;

the grass guiding surface guides the chopped grass from the second cutting circle to the first cutting circle, and the grass guiding surface is at least partially positioned above the second cutting circle.

7. The mower of claim 6 wherein the first cutting circle and the second cutting circle are coplanar and partially overlap, the grass guiding surface being located at least partially above the overlap area.

8. The mower of claim 1 wherein the transmission assembly includes a first gear, and second and third gears driven by the first gear, and the second and third gears are symmetrically disposed with respect to the first gear teeth; the power device is connected with the first gear through a first rotating shaft and is used for driving the first gear to rotate;

the first blade and the second blade rotate in the same direction and are connected to the second gear and the third gear respectively.

9. The lawnmower of claim 8, wherein the first blade is connected to the second gear via a second rotational shaft, the second gear rotating to rotate the first blade;

the second blade is connected with the third gear through a third rotating shaft, and the third gear rotates to drive the second blade to rotate.

10. The mower of claim 8 wherein the transmission assembly includes a fourth gear and a fifth gear, the fourth gear being in mesh with the first gear and the second gear, respectively, and the fifth gear being in mesh with the first gear and the third gear, respectively; the transmission assembly is arranged to be in a straight line shape or a V-shaped structure.

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