CN219452819U

CN219452819U - Mower gear box convenient for disassembling and assembling grass mowing heads

Info

Publication number: CN219452819U
Application number: CN202320428673.1U
Authority: CN
Inventors: 孙树科; 贾滨; 黄泽林; 陈曦
Original assignee: Zhejiang Weiguang Industry And Trade Co ltd
Current assignee: Zhejiang Weiguang Industry And Trade Co ltd
Priority date: 2023-03-03
Filing date: 2023-03-03
Publication date: 2023-08-01
Anticipated expiration: 2033-03-03

Abstract

The utility model discloses a mower gear box convenient for disassembling and assembling a grass mowing head. The novel grass mowing machine comprises a gear box body, wherein a limiting cover is sleeved on the outer side of a gear shaft at the lower part of the gear box body, the gear shaft is connected with the limiting cover through a spline, a first through hole penetrating through the gear box body from top to bottom is formed in the gear box body, a limiting hole is formed in the position, corresponding to the first through hole, of the limiting cover, a limiting pin capable of extending into/separating from the limiting hole in the first through hole is arranged on the limiting cover, and an external thread used for connecting a grass mowing head is arranged at the bottom of the gear shaft. The grass cutting head can be disassembled and assembled without any tool, and the grass cutting head is convenient to operate and saves time and labor.

Description

Mower gear box convenient for disassembling and assembling grass mowing heads

Technical Field

The utility model relates to the technical field of mower components, in particular to a mower gear box convenient for disassembling and assembling a grass mowing head.

Background

At present, the mower is widely applied to the fields of landscaping and the like and is used for pruning branches and leaves and cutting weeds. The mower adopts a gasoline engine or a motor to provide power, the power is transmitted in the gear box, and the gear shaft drives the grass mowing head on the mower to rotate so as to trim or cut weeds, shrubs and the like.

The structure of the existing mower gear box is shown in fig. 7, when the existing mower gear box is used for installing and detaching the mowing head, the first rotation stopping opening 20 on the limiting cover is required to be aligned with the two second rotation stopping openings 21 on the gear box, then the rotation stopping tool is inserted to stop rotation of the gear shaft, then the mowing head can be installed and detached, the operation is troublesome, and particularly when the mowing head needs to be replaced in field operation, the user has to carry the rotation stopping tool, and the risk that the rotation stopping tool is lost and the mowing head cannot be detached exists.

Disclosure of Invention

The utility model aims to solve the technical problems, and provides the mower gear box which is convenient for disassembling and assembling the mowing head, and the mowing head can be disassembled and assembled without any tool, so that the mower gear box is convenient to operate and saves time and labor.

In order to solve the problems, the utility model is realized by adopting the following technical scheme:

the mower gear box convenient for disassembling and assembling the grass cutting head comprises a gear box body, wherein a limiting cover is sleeved on the outer side of a gear shaft at the lower part of the gear box body, the gear shaft is connected with the limiting cover through a spline, a first through hole penetrating through the gear box body from top to bottom is formed in the gear box body, a limiting hole is formed in the limiting cover at a position corresponding to the first through hole, a limiting pin capable of extending into/separating from the limiting hole is arranged in the first through hole, and an external thread for connecting the grass cutting head is arranged at the bottom of the gear shaft.

In this scheme, when installing the head of beating grass, rotate spacing lid to spacing hole and be located spacing round pin below position, stretch into spacing hole with the spacer pin and make the gear shaft can not rotate, with head of beating grass and gear shaft bottom threaded connection, screw on the gear shaft, later upwards remove the spacer pin and break away from spacing hole, accomplish the installation. The rotation direction of the external thread is opposite to the rotation direction of the gear shaft when the mower works.

When the grass mowing head is disassembled, the limiting cover is rotated to a position, below the limiting pin, of the limiting hole, the limiting pin stretches into the limiting hole to enable the gear shaft to be unable to rotate, and the grass mowing head is reversely rotated to enable the grass mowing head to be separated from the bottom of the gear shaft to be in threaded connection, so that the disassembly is completed.

Preferably, the first through hole comprises a key hole and a pin hole which are communicated with each other, the key hole is positioned above the pin hole, a key is arranged in the key hole, the limiting pin is arranged at the bottom of the key, and the limiting pin penetrates through the pin hole.

Preferably, the limiting pin is sleeved with a check ring, and the check ring is positioned below the pin hole. The limiting pin is sleeved with a reset spring, and the reset spring is positioned in the key hole.

Preferably, the ratchet wheel coaxial with the gear shaft is arranged on the outer side of the gear shaft, the ratchet wheel is located between the gear box body and the limiting cover and fixedly connected with the gear box body, two ratchet teeth distributed in the same direction are arranged on the outer edge of the ratchet wheel, the two ratchet teeth are arranged in a central symmetry mode, pawls matched with the ratchet teeth are arranged on the corresponding positions of the limiting cover and correspond to the ratchet teeth, the pawls are rotationally connected with the limiting cover through a rotating shaft, and torsion springs are arranged on the rotating shaft.

The ratchet teeth are distributed in a clockwise direction. The rotation direction of the gear shaft is clockwise when the mower works, and the rotation direction of the external thread is anticlockwise. When the grass cutting head is installed, the grass cutting head rotates on the gear shaft in the anticlockwise direction, the gear shaft is driven to rotate anticlockwise, the gear shaft drives the limiting cover to rotate anticlockwise, the pawl on the limiting cover also rotates anticlockwise until the pawl contacts with the vertical contact surface of the ratchet, the pawl can be clamped by the ratchet, and therefore rotation of the gear shaft is limited, and the grass cutting head is screwed on the gear shaft. When the mower works, the gear shaft rotates clockwise to drive the limiting cover to rotate clockwise, the pawl on the limiting cover rotates clockwise, the pawl contacts with the inclined contact surface of the ratchet, the pawl cannot be clamped by the ratchet, the grass cutting head rotates clockwise to work, and the grass cutting head rotates more tightly.

When the grass mowing head is disassembled, the limiting cover is rotated to a position, below the limiting pin, of the limiting hole, the limiting pin stretches into the limiting hole to enable the gear shaft to be unable to rotate, the grass mowing head is rotated clockwise to enable the grass mowing head to be separated from the bottom of the gear shaft, and disassembly is completed.

Preferably, when the limit cover rotates to a position where the pawl is clamped into the ratchet, the limit hole is located right below the limit pin.

When the grass cutting head is dismounted, the grass cutting head is firstly rotated anticlockwise, the grass cutting head drives the limit cover to rotate anticlockwise through the gear shaft until the pawl contacts with the vertical contact surface of the ratchet, the pawl is clamped by the ratchet, at the moment, the limit hole is positioned right below the limit pin, the limit pin is pushed down to extend into the limit hole so that the gear shaft cannot rotate, then, the grass cutting head is rotated clockwise to enable the grass cutting head to be separated from the bottom of the gear shaft, and the grass cutting head is dismounted conveniently.

Preferably, the bottom of the pawl is provided with a limiting rod, a limiting groove for the insertion of the limiting rod is formed in the position, corresponding to the limiting rod, of the limiting cover, when the pawl rotates, the limiting rod at the bottom of the pawl can move in the limiting groove, the limiting rod at the bottom of the pawl is driven by the torsion spring to abut against the innermost side of the limiting groove, and when the limiting rod is located at the outermost side of the limiting groove, the pawl is not contacted with the ratchet teeth on the ratchet wheel which rotates.

When the mower works, the gear shaft rotates clockwise to drive the limit cover to rotate clockwise, the pawl on the limit cover rotates clockwise, and the pawl rotates outwards under the left and right sides of centrifugal force to enable the limit rod to move from the innermost side of the limit groove to the outermost side of the limit groove, so that the pawl is always not contacted with the ratchet on the ratchet wheel which rotates, and abrasion between the pawl and the ratchet wheel is avoided.

Preferably, the limiting groove is arc-shaped, and the arc center of the arc is positioned on the rotating center of the corresponding pawl.

Preferably, a protective cover covering the lower part of the gear box body is arranged below the limit cover, the protective cover is fixedly connected with the limit cover through a connecting piece, and a second through hole for the gear shaft to penetrate out is formed in the middle of the protective cover. When preventing the grass-mowing head from mowing, the parts at the lower part of the gear box body are wrapped with grass.

Preferably, the protection cover is provided with two maintenance ports, and the two maintenance ports are respectively positioned right below the two pawls.

The beneficial effects of the utility model are as follows: the grass mowing head can be disassembled and assembled without any tool, so that the operation is convenient, and the time and the labor are saved.

Drawings

FIG. 1 is a schematic structural view of an embodiment;

FIG. 2 is an exploded view of an embodiment;

FIG. 3 is a cross-sectional view of an embodiment;

FIG. 4 is a schematic view of the structure of a ratchet wheel and a ratchet tooth;

FIG. 5 is a top view of the combination of the limit cap and the protective cap;

FIG. 6 is a bottom view of FIG. 5;

fig. 7 is a schematic structural view of a prior art mower gearbox.

In the figure: 1. the novel grass-mowing machine comprises a gear box body, 2, a gear shaft, 3, a limiting cover, 4, a limiting hole, 5, a limiting pin, 6, a grass-mowing head, 7, a key hole, 8, a pin hole, 9, a key, 10, a retainer ring, 11, a ratchet wheel, 12, a ratchet, 13, a pawl, 14, a torsion spring, 15, a limiting rod, 16, a limiting groove, 17, a protective cover, 18, a second through hole, 19, a maintenance port, 20, a first rotation-stopping port, 21, a second rotation-stopping port, 22 and a return spring.

Detailed Description

The technical scheme of the utility model is further specifically described below through examples and with reference to the accompanying drawings.

Examples: the utility model provides a mower gear box convenient to dismouting grass-mowing head, as shown in fig. 1 through 6, including gear box body 1, gear shaft 2 outside cover in gear box body 1 lower part is equipped with spacing lid 3, gear shaft 2 passes through spline and spacing lid 3 coaxial coupling, be equipped with the first through-hole that runs through gear box body 1 from top to bottom on the gear box body 1, the position corresponds with first through-hole on the spacing lid 3 and is equipped with spacing hole 4, but the locating pin 5 of stretching into/breaking away from spacing hole 4 in the first through-hole, first through-hole includes button hole 7 and pinhole 8 of intercommunication, button hole 7 is located pinhole 8 top, be equipped with button 9 in the button hole 7, locating pin 5 sets up in button 9 bottom, the locating pin 5 passes pinhole 8, the cover is equipped with retaining ring 10 on the locating pin 5, retaining ring 10 is located pinhole 8 below, the cover is equipped with reset spring 22 on the locating pin 5, reset spring 22 is located in button hole 7, reset spring 22 is located between the bottom surface of button 9 and button hole 7, gear shaft 2 bottom is equipped with the external screw thread that is used for connecting grass-mowing head 6.

The ratchet 11 coaxial with the gear shaft 2 is arranged on the outer side of the gear shaft 2, the ratchet 11 is located between the gear box body 1 and the limit cover 3 and is fixedly connected with the gear box body 1, two ratchets 12 distributed in the same direction are arranged on the outer edge of the ratchet 11, the two ratchets 12 are arranged in a central symmetry mode, a pawl 13 matched with the ratchets 12 is arranged on the limit cover 3 and corresponds to the ratchets 12, the pawl 13 is rotationally connected with the limit cover 3 through a rotating shaft, a torsion spring 14 is arranged on the rotating shaft, when the limit cover 3 rotates to the position enabling the pawl 13 to be clamped into the ratchets 12, the limit hole 4 is located under the limit pin 5, a limit rod 15 is arranged at the bottom of the pawl 13, a limit groove 16 for inserting the limit rod 15 is arranged on the limit cover 3 and corresponds to the limit rod 15, when the pawl 13 rotates, the limit rod 15 at the bottom of the pawl 13 can move in the limit groove 16, the torsion spring 14 drives the limit rod 15 at the bottom of the pawl 13 to abut against the innermost side of the limit groove 16, and when the limit rod 15 is located at the outermost side of the limit groove 16, the pawl 13 is not in contact with the ratchet 12 on the rotating ratchet 11.

In this solution, the ratchet teeth are distributed in a clockwise direction. The rotation direction of the gear shaft is clockwise when the mower works, and the rotation direction of the external thread is anticlockwise. When the grass cutting head is installed, the grass cutting head rotates on the gear shaft in the anticlockwise direction, the gear shaft is driven to rotate anticlockwise, the gear shaft drives the limiting cover to rotate anticlockwise, the pawl on the limiting cover also rotates anticlockwise until the pawl contacts with the vertical contact surface of the ratchet, the pawl can be clamped by the ratchet, and therefore rotation of the gear shaft is limited, and the grass cutting head is screwed on the gear shaft. When the mower works, the gear shaft rotates clockwise to drive the limiting cover to rotate clockwise, the pawl on the limiting cover rotates clockwise, the pawl rotates outwards from left to right under centrifugal force to enable the limiting rod to move from the innermost side of the limiting groove to the outermost side of the limiting groove, at the moment, the pawl is not contacted with the ratchet on the rotating ratchet wheel all the time, abrasion between the pawl and the ratchet wheel is avoided, the pawl cannot be clamped by the ratchet, the grass cutting head rotates clockwise to work, and the grass cutting head rotates more tightly.

When the grass cutting head is dismounted, the grass cutting head is firstly rotated anticlockwise, the grass cutting head drives the limit cover to rotate anticlockwise through the gear shaft until the pawl contacts with the vertical contact surface of the ratchet, the pawl is clamped by the ratchet, at the moment, the limit hole is positioned right below the limit pin, the limit pin is pushed down to extend into the limit hole so that the gear shaft cannot rotate, then, the grass cutting head is rotated clockwise to enable the grass cutting head to be separated from the bottom of the gear shaft, dismounting is completed, dismounting is convenient, and then the limit pin is separated from the limit hole by the operation key, so that the grass cutting head can be mounted next time.

When the existing mower gearbox is used for installing and detaching the grass mowing head, the gear shaft is required to be stopped from rotating by using a rotation stopping tool, in addition, the grass mowing head can be detached by means of tools such as an internal hexagonal wrench or a socket wrench, the operation is inconvenient, and particularly when the grass mowing head needs to be replaced in field operation, the tool is required to be carried, and the risk that the grass mowing head cannot be detached due to the fact that the tool is lost exists. When the grass cutting head is installed and detached by the gear box of the grass cutting machine, no tool is needed, and the operation is convenient, time-saving and labor-saving.

The limiting groove 16 is arc-shaped, and the arc center of the arc is positioned on the rotation center of the corresponding pawl 13.

A protective cover 17 covering the lower part of the gear box body 1 is arranged below the limit cover 3, the protective cover 17 is fixedly connected with the limit cover 3 through a connecting piece, a second through hole 18 for the gear shaft 2 to penetrate out is arranged in the middle of the protective cover 17, two maintenance ports 19 are arranged on the protective cover 17, and the two maintenance ports 19 are respectively positioned under the two pawls 13.

The protective cover is used for preventing parts at the lower part of the gear box body from winding grass when the grass cutting head cuts grass. The maintenance port is convenient for maintaining the pawl.

Claims

1. The utility model provides a lawn mower gear box convenient to dismouting head of beating grass, its characterized in that, including gear box body (1), gear shaft (2) outside cover of gear box body (1) lower part is equipped with spacing lid (3), gear shaft (2) are connected with spacing lid (3) through the spline, be equipped with the first through-hole that runs through gear box body (1) from last to down on gear box body (1), be equipped with spacing hole (4) with first through-hole correspondence position on spacing lid (3), be equipped with locating pin (5) that can stretch into/break away from spacing hole in the first through-hole, gear shaft (2) bottom is equipped with the external screw thread that is used for connecting head of beating grass (6).

2. The mower gear box convenient for disassembling and assembling a grass mowing head according to claim 1, wherein the first through hole comprises a key hole (7) and a pin hole (8) which are communicated with each other, the key hole (7) is located above the pin hole (8), a key (9) is arranged in the key hole (7), the limiting pin (5) is arranged at the bottom of the key (9), and the limiting pin (5) penetrates through the pin hole (8).

3. The mower gear box convenient for disassembling and assembling the mowing head according to claim 2, wherein the limiting pin (5) is sleeved with a check ring (10), and the check ring (10) is positioned below the pin hole (8).

4. A mower gear box convenient for disassembling and assembling a grass cutting head according to claim 1, 2 or 3, characterized in that, a ratchet wheel (11) coaxial with the gear shaft (2) is arranged on the outer side of the gear shaft (2), the ratchet wheel (11) is positioned between the gear box body (1) and the limit cover (3) and is fixedly connected with the gear box body (1), two ratchets (12) distributed in the same direction are arranged on the outer edge of the ratchet wheel (11), the two ratchets (12) are arranged in a central symmetry mode, a pawl (13) matched with the ratchets (12) is arranged on the limit cover (3) at a position corresponding to the ratchets (12), the pawl (13) is rotationally connected with the limit cover (3) through a rotating shaft, and a torsion spring (14) is arranged on the rotating shaft.

5. A mower gearbox convenient for removing and installing a mowing head according to claim 4, wherein the limiting hole (4) is positioned under the limiting pin (5) when the limiting cover (3) rotates to a position that the pawl (13) is clamped into the ratchet (12).

6. The mower gear box convenient for disassembling and assembling a grass cutting head according to claim 4, wherein a limit rod (15) is arranged at the bottom of the pawl (13), a limit groove (16) for inserting the limit rod (15) is formed in a position, corresponding to the limit rod (15), of the limit cover (3), when the pawl (13) rotates, the limit rod (15) at the bottom of the pawl (13) can move in the limit groove (16), the limit rod (15) at the bottom of the pawl (13) is tightly abutted against the innermost side of the limit groove (16) by the torsion spring (14), and when the limit rod (15) is located at the outermost side of the limit groove (16), the pawl (13) is not contacted with a ratchet (12) on the rotating ratchet wheel (11).

7. A mower gearbox convenient for disassembling and assembling a mowing head according to claim 6, wherein the limiting groove (16) is arc-shaped, and an arc center of the arc is positioned on a rotating center of the corresponding pawl (13).

8. The mower gear box convenient for disassembling and assembling the mowing head according to claim 4, wherein a protective cover (17) covering the lower part of the gear box body (1) is arranged below the limit cover (3), the protective cover (17) is fixedly connected with the limit cover (3) through a connecting piece, and a second through hole (18) for the gear shaft (2) to penetrate is formed in the middle of the protective cover (17).

9. A mower gearbox convenient for disassembling and assembling a mowing head according to claim 8, characterized in that two maintenance openings (19) are formed in the protective cover (17), and the two maintenance openings (19) are respectively located under the two pawls (13).