A side-discharge chassis assembly for a lawn mower

Abstract

The utility model provides a side-discharge chassis assembly for a lawn mower, including a chassis, one side of the chassis is opened outward to form a side discharge port, a convex strip is arranged on the top wall of the side discharge port, the length direction of the convex strip is perpendicular to the grass discharge direction of the side discharge port, and a guide arc surface is formed on one end of the convex strip facing the cutting assembly in the chassis. The grass throwing airflow is guided by the Coanda effect, and the straight grass throwing airflow is changed into a curve, so that the airflow that sprays out the grass pieces in one breath is changed into an airflow that carries the grass pieces to a distance at one end and then throws them out, thereby increasing the distance that the grass pieces are carried by the airflow; enhancing the situation that the strength of the airflow will be different when the grass pieces of different sizes are carried by the airflow due to their own weight; because the airflow strength is weak when the larger grass pieces are carried, the smaller grass pieces can be thrown farther after leaving the side discharge port under the action of the grass throwing airflow strength and inertia, so that the grass pieces of different sizes can be evenly scattered, and the situation that the grass pieces need to be manually leveled after accumulation is reduced.

Description

Technical Field

[0001] The utility model relates to the field of lawn mowers, in particular to a side-discharge chassis assembly of a lawn mower. Background Art

[0002] A lawn mower is also called a weed cutter, a lawn mower, a lawn trimmer, etc. A lawn mower is a mechanical tool used to trim lawns, vegetation, etc. It consists of a cutter disc, an engine, a running wheel, a running mechanism, a blade, an armrest, and a control part.

[0003] A Chinese patent with announcement number CN107624369A discloses a lawn mower with side discharge, including a casing, a side discharge port for side discharge of grass on the casing, and a protective cover for closing the side discharge port. The protective cover is rotatably mounted on the casing. The lawn mower also includes a movable limit plate arranged on the casing, and when the protective cover rotates from a closed state to an open direction, the movable limit plate and the protective cover are abutted to generate a damping force to limit the further rotation of the protective cover.

[0004] The above-mentioned related technical solutions have the following defects: the side discharge port is only a through hole that completely penetrates the casing, and is unable to guide the airflow generated when throwing the grass, resulting in the throwing distance of the grass clippings being too close. The thrown grass clippings are easy to accumulate, and the accumulated grass clippings need to be leveled manually to reduce the accumulation of grass clippings, which causes the grass to grow prematurely in other places due to excessive fertility and affects the beauty of the lawn. Utility Model Content

[0005] In order to reduce the situation where grass clippings are thrown too close, resulting in the grass clippings being easily piled up and requiring manual leveling of the grass clippings, the present application provides a side-discharge chassis assembly for a lawn mower.

[0006] The side-discharge chassis assembly of a lawn mower provided in the present application adopts the following technical solution:

[0007] A side-discharge chassis assembly for a lawn mower comprises a chassis, one side of the chassis is opened outward to form a side discharge port, a convex strip is arranged on the top wall of the side discharge port, the length direction of the convex strip is perpendicular to the grass discharge direction of the side discharge port, and a guiding arc surface is formed on one end of the convex strip facing the cutting assembly in the chassis.

[0008] Through the above technical scheme, the Coanda effect is used to guide the grass-throwing airflow, and the straight grass-throwing airflow is changed into a curve, so that the airflow that sprays out the grass clippings in one breath is changed into an airflow that carries the grass clippings to a certain distance before throwing them out, thereby increasing the distance that the grass clippings are carried by the airflow; it is enhanced that when grass clippings of different sizes are carried by the airflow due to their own weight, the strength of the airflow will be different; since the airflow intensity is weaker when larger grass clippings are carried, smaller grass clippings can be thrown farther after leaving the side discharge port under the action of the grass-throwing airflow intensity and inertia, thereby allowing grass clippings of different sizes to be evenly scattered, reducing the situation where grass clippings need to be manually leveled; the effect of the Coanda effect is that when a fluid flows through the surface of a protruding object, the flow rate will slow down due to the friction of the object surface, causing the fluid to be adsorbed on the surface of the object, so that if the curvature of the object surface is not too large, the fluid will flow along the surface of the object.

[0009] Preferably, the side discharge port is located at the inner end and the outer end on both sides of the convex strip, and a rising surface is provided on the top wall of the inner end. The rising surface is inclined upward toward the convex strip, and the rising surface smoothly transitions with the guide arc surface.

[0010] Through the above technical solution, the design of the rising surface makes the grass clippings have an upward movement trend before passing through the convex strips, so as to better adhere to the bottom end of the cover plate. The smooth transition between the rising surface and the guide camber surface is to reduce the situation where the curvature is too large to affect the Coanda effect.

[0011] Preferably, the outer top wall and the bottom end of the convex strip have a smooth transition.

[0012] Through the above technical solution, the end of the convex strip away from the rising surface is flush with the cover plate in order to have a stable distance to layer grass clippings of different sizes by gravity and inertia, so that grass clippings of different sizes are thrown at different distances, reducing the accumulation of grass clippings.

[0013] Preferably, the side walls on both sides of the side outlet are arranged in a tapered shape.

[0014] Through the above technical solution, the cross-sectional area of ​​the side walls on both sides of the side discharge port becomes smaller as they are closer to the outer end. According to the calculation formula of the air flow velocity, the cross-sectional area becomes smaller and the flow velocity becomes larger, thereby increasing the outlet speed when the grass clippings are thrown, so that the grass clippings can be thrown farther and the accumulation of grass clippings is reduced.

[0015] Preferably, a countersunk groove is provided on the convex strip, and the convex strip is fixed to the top wall of the side discharge port by bolts, and the bolts are located in the countersunk groove. A clamping block is also provided on the countersunk groove, and the clamping block is used to hide the countersunk groove.

[0016] Through the above technical solution, the convex strips can be removed by bolts to change the thickness and length of the convex strips, which makes it easier to change the distance of the grass-throwing airflow and thus change the grass-throwing distance; at the same time, the setting of the countersunk grooves and the blocking blocks keeps the surface of the convex strips flat, reducing the impact on the grass-throwing airflow.

[0017] Preferably, an arc bar is further provided on the top wall of the side discharge port, one end of the arc bar is arranged toward the outer end of the side discharge port, and the other end of the arc bar is arranged toward the inner end of the side discharge port, the convex curve of the arc bar is toward the end away from the forward direction of the lawn mower, and the arc bar has a gentle curvature.

[0018] Through the above technical solution, the design of the arc strip also utilizes the Coanda effect, thereby changing the direction of the grass-throwing airflow, and changing the direction of the grass-throwing airflow blown out in a horizontal straight line to the forward direction of the lawn mower, thereby reducing the situation where grass clippings are thrown onto the operator on windy days.

[0019] The technical effects of this utility model are mainly reflected in the following aspects:

[0020] 1. The utility model uses the Coanda effect to guide the grass throwing airflow by designing the side discharge port and the convex strips, so that the airflow that sprays out the grass clippings in one breath is changed into the airflow that carries the grass clippings to a certain distance before being thrown out, thereby increasing the distance that the grass clippings are carried by the airflow; it enhances the situation that the strength of the airflow will be different when the grass clippings of different sizes are carried by the airflow due to their own weight; since the airflow strength is weaker when the larger grass clippings are carried, the smaller grass clippings can be thrown farther after leaving the side discharge port under the action of the grass throwing airflow strength and inertia, so that the grass clippings of different sizes can be evenly scattered, reducing the situation that the grass clippings need to be manually leveled;

[0021] 2. The utility model changes the flow rate by setting the side walls of the side outlet in a tapered shape, thereby increasing the outlet speed of the grass clippings during ejection, so that the grass clippings can be ejected farther and the accumulation of grass clippings can be reduced;

[0022] 3. The utility model changes the direction of the grass-throwing airflow by designing arc strips, and changes the direction of the grass-throwing airflow blown out in a horizontal straight line to a forward direction, thereby reducing the situation where broken grass is thrown onto the operator on windy days. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present application;

[0024] Figure 2 In the embodiment of this application Figure 1 A schematic diagram of a section taken along the AA section line;

[0025] Figure 3 For the embodiment of this application Figure 1Schematic diagram of the overall structure on the reverse side.

[0026] Figure numerals: 1. chassis; 11. side outlet; 12. side outlet top wall; 13. side wall; 14. inner end; 15. outer end; 2. convex strip; 21. countersunk groove; 22. bolt; 23. block; 24. guide arc surface; 3. rising surface; 4. arc strip; 5. grass-throwing airflow; 6. forward direction; 7. cutting assembly. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-3 , the specific implementation methods of the utility model are further described in detail to make the technical solution of the utility model easier to understand and grasp.

[0028] The present application embodiment discloses a side-discharge chassis assembly for a lawn mower:

[0029] Reference Figure 1-Figure 3 A side-discharge chassis assembly of a lawn mower includes a chassis 1, a side discharge port 11 is formed outwardly at one side of the chassis 1, a convex strip 2 is arranged on the top wall of the side discharge port 11, the length direction of the convex strip 2 is perpendicular to the grass discharge direction of the side discharge port 11, and a guide arc surface 24 is formed on one end of the convex strip 2 facing the cutting assembly 7 in the chassis 1.

[0030] The grass throwing airflow 5 is guided by the Coanda effect, and the straight grass throwing airflow 5 is changed into a curve, so that the airflow that sprays out the grass clippings in one breath is changed into an airflow that carries the grass clippings to a certain distance before throwing them out, thereby increasing the distance that the grass clippings are carried by the airflow. It is enhanced that when grass clippings of different sizes are carried by the airflow due to their own weight, the strength of the airflow will be different. Since the airflow strength is weaker when larger grass clippings are carried, smaller grass clippings can be thrown farther after leaving the side discharge port 11 under the action of the strength and inertia of the grass throwing airflow 5, so that grass clippings of different sizes can be evenly scattered, reducing the situation where grass clippings need to be manually leveled when they are piled up.

[0031] The Coanda effect is that when a fluid flows through a convex surface, the flow rate will slow down due to the friction of the surface, causing the fluid to be adsorbed on the surface of the object, so that if the curvature of the surface of the object is not too large, the fluid will flow along the surface of the object.

[0032] Reference Figure 2 The side discharge port 11 is located on both sides of the convex strip 2, which are the inner end 14 and the outer end 15. The top wall of the inner end 14 is provided with a rising surface 3, which is inclined upward toward the convex strip 2, and the rising surface 3 and the guide arc surface 24 have a smooth transition. The design of the rising surface 3 makes the grass clippings have an upward movement trend before passing through the convex strip 2, so as to better adhere to the bottom end of the cover plate. The smooth transition between the rising surface 3 and the guide arc surface 24 is to reduce the situation where the curvature is too large to affect the Coanda effect.

[0033] Reference Figure 1 and Figure 3 The side walls 13 of the side outlet 11 are arranged in a tapered shape. The closer the side walls 13 of the side outlet 11 are to the outer end 15, the smaller the cross-sectional area is. According to the calculation formula of the air flow velocity, the smaller the cross-sectional area is, the greater the flow velocity is, thereby increasing the outlet velocity of the grass clippings when projecting, so that the grass clippings can be projected farther and the accumulation of grass clippings is reduced.

[0034] Reference Figure 2-Figure 3 The convex strip 2 is provided with a countersunk groove 21, and the convex strip 2 is fixed to the top wall of the side discharge port 11 by a bolt 22, the bolt 22 is located in the countersunk groove 21, and a clamping block 23 is also clamped on the countersunk groove 21, and the clamping block 23 is used to hide the countersunk groove 21. The convex strip 2 can be disassembled by the bolt 22 to change the thickness and length of the convex strip 2, so as to change the distance of the grass throwing airflow 5 and thus change the distance of the grass throwing; at the same time, the arrangement of the countersunk groove 21 and the clamping block 23 keeps the surface of the convex strip 2 flat, reducing the influence on the grass throwing airflow 5.

[0035] Reference Figure 3 The top wall of the side outlet 11 is also detachably fixed with an arc bar 4 by screws, one end of the arc bar 4 is arranged toward the outer end 15 of the side outlet 11, and the other end of the arc bar 4 is arranged toward the inner end 14 of the side outlet 11, and the arc bar 4 is protruding toward the end away from the forward direction 6 of the lawn mower, and the arc of the arc bar 4 is relatively gentle. The design of the arc bar 4 also utilizes the Coanda effect, thereby changing the direction of the grass-throwing airflow 5, and changing the direction of the grass-throwing airflow 5 blown out of the horizontal straight line to the forward direction 6 of the lawn mower, thereby reducing the situation where the grass clippings are thrown onto the operator on windy days.

[0036] Of course, the above are only typical examples of the present invention. In addition, the present invention may have many other specific implementations. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A side-discharge chassis assembly for a lawn mower, comprising a chassis (1), characterized in that: One side of the chassis (1) is opened outward to form a side discharge port (11), a convex strip (2) is provided on the top wall of the side discharge port (11), the length direction of the convex strip (2) is perpendicular to the grass discharge direction of the side discharge port (11), and one end of the convex strip (2) facing the cutting component (7) in the chassis (1) is formed with a guide arc surface (24).

2. A side-discharge chassis assembly for a lawn mower according to claim 1, characterized in that: The side discharge port (11) is located on both sides of the convex strip (2), namely an inner end (14) and an outer end (15), and a rising surface (3) is provided on the top wall of the inner end (14). The rising surface (3) is inclined upward toward the convex strip (2), and the rising surface (3) smoothly transitions with the guide arc surface (24).

3. A side-discharge chassis assembly for a lawn mower according to claim 2, characterized in that: The top wall of the outer end (15) and the bottom end of the convex strip (2) are smoothly transitioned.

4. A side-discharge chassis assembly for a lawn mower according to claim 1, characterized in that: The side walls (13) on both sides of the side discharge port (11) are arranged in a tapered shape.

5. A side-discharge chassis assembly for a lawn mower according to claim 1, characterized in that: The convex strip (2) is provided with a countersunk groove (21), and the convex strip (2) is fixed to the top wall of the side discharge port (11) by means of a bolt (22), and the bolt (22) is located in the countersunk groove (21). A clamping block (23) is also provided on the countersunk groove (21), and the clamping block (23) is used to hide the countersunk groove (21).

6. A side-discharge chassis assembly for a lawn mower according to claim 1, characterized in that: An arc strip (4) is also provided on the top wall of the side discharge port (11), one end of the arc strip (4) is arranged toward the outer end (15) of the side discharge port (11), and the other end of the arc strip (4) is arranged toward the inner end (14) of the side discharge port (11), the arc strip (4) protrudes toward the end away from the forward direction (6) of the lawn mower, and the arc strip (4) has a relatively gentle curvature.

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