Clutch for mower

Abstract

The clutch comprises an engine output shaft, a friction disc is fixed to the end of the engine output shaft, a transmission column extending up and down is formed in the center of the friction disc, a blade mounting base is fixed to the bottom of the transmission column in a hinged mode, and a driven disc capable of moving in the axial direction is arranged at the top of the blade mounting base; a plurality of joint springs propped against the driven disc are arranged between the driven disc and the blade mounting seat; the engine connecting disc is used for fixing the clutch to an engine, a plurality of bolts are arranged at the bottom of the engine connecting disc and sleeved with return springs, a rotary disc and a brake cover are arranged between the return springs and the engine connecting disc, the brake cover is arranged below the rotary disc, the bolts penetrate through the brake cover and the rotary disc, and the brake cover is arranged below the rotary disc. A plurality of kidney-shaped holes allowing the bolts to move are formed in the rotating disc, the return spring abuts against the bottom of the brake cover, and the rotating disc is hinged and fixed to the top of the transmission column.

Description

Technical Field

[0001] This application relates to the field of lawnmower technology, and in particular to a clutch for a lawnmower. Background Technology

[0002] Lawn mowers, especially gasoline-powered push lawn mowers, have become a common tool for home and professional garden maintenance.

[0003] Currently, when starting a lawnmower, after the grass box is full, the grass needs to be manually emptied. Before starting, the engine needs to be turned off, and after finishing the cleaning, the engine needs to be turned on again. This process is repeated frequently, requiring the engine to be turned on and off, which is too cumbersome and reduces the efficiency of mowing.

[0004] Therefore, a special clutch for lawnmowers is needed to interrupt power transmission and ensure the safety of the operator when adjusting the height of the lawnmower wheels, unloading grass, and performing other operations.

[0005] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is the closest prior art to this application. Summary of the Invention

[0006] Based on this, this application provides a clutch for a lawnmower to solve one of the aforementioned technical problems.

[0007] The technical solution adopted by this application to solve its technical problem is: a clutch for a lawnmower, comprising: an engine output shaft with a friction disc fixed at its end, a vertically extending transmission column formed at the center of the friction disc, a blade mounting seat hinged to the bottom of the transmission column, a driven disc capable of axial movement at the top of the blade mounting seat, and a plurality of engagement springs abutting against the driven disc between the driven disc and the blade mounting seat; an engine connecting plate for fixing the clutch to the engine, with a plurality of bolts at its bottom, a return spring sleeved on the bolts, and a rotating disc and a... A brake cover is disposed below the rotating disk. A bolt passes through the brake cover and the rotating disk. The rotating disk has several oblong holes for the bolt to move. A return spring abuts against the bottom of the brake cover. The rotating disk is hinged to the top of the transmission column. Several inclined grooves with gradually varying depths are formed on the top of the brake cover and the bottom of the rotating disk. Steel balls are placed in the inclined grooves. When the rotating disk is rotated, the steel balls move in the inclined grooves under the guidance of the grooves, which can control the axial movement of the brake cover. The brake cover drives the driven disk to contact or disengage from the friction disk, realizing the engagement and disengagement of power transmission.

[0008] In some embodiments, the top of the blade mount is provided with a pair of guide posts and a plurality of mounting posts evenly distributed in a ring. The guide posts pass through the driven disc, and the engagement spring is sleeved on the mounting posts. The driven disc is axially movable on the guide posts.

[0009] In some embodiments, the driven disc, blade mounting seat, brake cover, and rotating disc are all provided with through holes at their centers. The driven disc and blade mounting seat are sleeved on the lower half of the transmission column, and the brake cover and rotating disc are sleeved on the upper half of the transmission column.

[0010] In some embodiments, bearings are fixed in the through holes of both the blade mounting base and the rotating disk, and the rotating disk and the blade mounting base are respectively hinged and fixed to the upper and lower ends of the transmission column through the bearings.

[0011] In some embodiments, a blade is fixed to the bottom of the blade mount.

[0012] In some embodiments, an axially penetrating through hole is provided at the center of the transmission column, and the engine output shaft is inserted into the through hole and fixed by a keyway and a friction disc.

[0013] In some embodiments, a steel ball fixing bracket is provided between the brake cover and the rotating disk, and the steel ball fixing bracket has mounting holes of the same number as the steel balls, and the steel balls are disposed in the mounting holes.

[0014] In some embodiments, a plurality of elastic locking blocks are provided circumferentially at equal intervals on the inner wall of the mounting hole.

[0015] In some embodiments, a friction material is adhered to the bottom surface of the friction disc.

[0016] The beneficial effects of this application are as follows: 1) By rotating a rotating disc, steel balls are driven to move circumferentially within an inclined chute. Guided by the chute, the brake cover below the steel balls moves axially. When power transmission needs to be disconnected, rotating the rotating disc in a specific direction drives the brake cover towards the driven disc, causing it to move axially against the driven disc until it disengages from the friction disc. Conversely, when power transmission is needed, simply rotating the rotating disc in the opposite direction disengages the brake cover from the driven disc. The driven disc returns to its original position under the action of the engagement spring, re-engaging with the friction disc, which then transmits torque to the blade mounting base and blades via the driven disc. This convenient and quick disengagement of power transmission ensures operator safety during operations such as weeding.

[0017] 2) The clutch in this application is specially designed with an engine connection plate, which allows the clutch to be installed on engines of different brands and specifications, thus improving the clutch's applicability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional schematic diagram of the clutch in this application.

[0020] Figure 2 This is a schematic diagram of the clutch explosion in this application.

[0021] Figure 3 This is a schematic diagram of a partial explosion of the clutch in this application.

[0022] Figure 4 This is a detailed view of the top of the brake cover in this application.

[0023] The reference numerals in the attached diagram are as follows: 1. Engine output shaft, 2. Friction disc, 3. Drive column, 4. Blade mounting seat, 5. Driven disc, 6. Engagement spring, 7. Engine connecting disc, 8. Bolt, 9. Return spring, 10. Rotating disc, 11. Brake cover, 12. Waist-shaped hole, 13. Inclined groove, 14. Steel ball, 15. Guide column, 16. Mounting column, 17. Through hole, 18. Bearing, 19. Blade, 20. Through hole, 21. Steel ball retainer, 22. Mounting hole, 23. Elastic locking block. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application. In addition, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those of ordinary skill in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection of this application.

[0025] In the embodiments of this application, please refer to Figure 1-4As shown, this type of clutch for a lawnmower mainly includes: an engine output shaft 1, with a friction disc 2 fixed at its end. A transmission column 3 extending vertically is formed at the center of the friction disc 2. A blade mounting seat 4 is hinged to the bottom of the transmission column 3. A driven disc 5 capable of axial movement is provided on the top of the blade mounting seat 4. Several engagement springs 6 are provided between the driven disc 5 and the blade mounting seat 4, abutting against the driven disc 5. The engagement springs 6 always exert an axial force on the driven disc 5 towards the friction disc 2 to drive the driven disc 5 to reset. An engine connecting disc 7 is used to fix the clutch to the engine. Several bolts 8 are provided at its bottom. A return spring 9 is sleeved on the bolts 8. One end of the return spring 9 is supported by the end of the bolt 8, so that the return spring 9 is restricted on the bolt 8. The return spring 9 is used to drive the return of the brake cover 11. A rotating disc 10 and a brake cover 11 are provided between the return spring 9 and the engine connecting disc 7. The brake cover 11 is located below the rotating disc 10. The bolt 8 passes through the brake cover 11 and the rotating disk 10. The rotating disk 10 has several oblong holes 12 for the bolt 8 to move. The return spring 9 abuts against the bottom of the brake cover 11. The rotating disk 10 is hinged to the top of the transmission column 3. Several gradually changing inclined grooves 13 are formed at the top of the brake cover 11 and the bottom of the rotating disk 10. Steel balls 14 are placed in the inclined grooves 13. Rotating the rotating disk 10, guided by the inclined grooves 13, causes the bolt 8 to move. The steel ball 14 moves within the inclined groove 13, which controls the axial movement of the brake cover 11. The brake cover 11 drives the driven disc 5 to contact or disengage from the friction disc 2, thereby realizing the engagement and disengagement of power transmission. The inclined groove 13 on the rotating disc 10 and the brake cover 11 are corresponding upper and lower parts. The upper part of the steel ball 14 is placed in the inclined groove 13 on the rotating disc 10, and the lower part is located in the inclined groove 13 on the brake cover 11. The inclined grooves 13 are evenly distributed circumferentially, and the number of inclined grooves 13 and steel balls 14 is preferably three.

[0026] After the rotating disk 10 is rotated, the steel ball 14, guided by the inclined groove 13, slides from the deep part of the inclined groove 13 to the shallow part, thereby driving the brake cover 11 below the inclined groove 13 to move axially towards the driven disk 5, and finally contacts and drives the driven disk 5 to move axially towards the engine connecting disk 7, so that the driven disk 5 and the friction disk 2 are disengaged, and the power transmission is interrupted. Similarly, when the rotating disk 10 is rotated in the opposite direction, the steel ball 14 moves from the shallow part of the inclined groove 13 to the deep part of the inclined groove 13, the brake cover 11 returns under the action of the return spring 9 and disengages from the driven disk 5, while the driven disk 5 returns under the action of the engagement spring 6, re-contacts and squeezes the friction disk 2, the power transmission is re-engaged, and the torque of the engine output shaft 1 is transmitted to the driven disk 5 through the friction disk 2, and finally to the blade mounting seat 4 and the blade 19.

[0027] The rotation of the rotating disc 10 is achieved by pressing the clutch lever on the lawnmower. Since the operation of the clutch lever is a conventional technique in the field and is not very relevant to this application, it will not be described in detail here.

[0028] The following will continue to describe some preferred / improved embodiments based on the above embodiments. Any one of the following embodiments can be selected, or multiple embodiments can be combined.

[0029] like Figure 1-2 As shown, the blade mounting base 4 has a pair of guide posts 15 and several mounting posts 16 evenly distributed in a ring on the top. The number of mounting posts 16 is preferably four, evenly distributed on both sides of the guide posts 15. The guide posts 15 pass through the driven disk 5. The engaging spring 6 is sleeved on the mounting post 16. The driven disk 5 can move axially on the guide posts 15.

[0030] Furthermore, through holes 17 are provided at the center of the driven disk 5, the blade mounting seat 4, the brake cover 11 and the rotating disk 10. The driven disk 5 and the blade mounting seat 4 are sleeved on the lower half of the transmission column 3, and the brake cover 11 and the rotating disk 10 are sleeved on the upper half of the transmission column 3.

[0031] Furthermore, bearings 18 are fixed in the through holes 17 on both the blade mounting base 4 and the rotating disk 10. Through the bearings 18, the rotating disk 10 and the blade mounting base 4 are respectively hinged and fixed to the upper and lower ends of the transmission column 3. Therefore, the driven disk 5 is restricted between the friction disk 2 and the blade mounting base 4, and the brake cover 11 is restricted between the friction disk 2 and the rotating disk 10. The rotating disk 10 and the blade mounting base 4 are hinged to the transmission column 3 through the bearings 18, which also restricts the axial position of both.

[0032] Specifically, the blade 19 is fixed at the bottom of the blade mounting base 4. When the driven disk 5 is driven to rotate by the friction disk 2, the driven disk 5 can transmit power to the blade mounting base 4, thereby driving the blade 19 on the blade mounting base 4 to rotate. When the driven disk 5 and the friction disk 2 are disconnected, the blade 19 will not rotate, making the operation safer.

[0033] Furthermore, an axially penetrating through hole 20 is provided at the center of the transmission column 3. The engine output shaft 1 is inserted into the through hole 20 and fixed to the friction disc 2 by keyway engagement, so that the torque of the engine output shaft 1 can be transmitted to the friction disc 2 through the transmission column 3. The axial position of the engine output shaft 1 and the friction disc 2 is fixed as the engine connecting disc 7 is fixed to the engine.

[0034] Furthermore, a steel ball fixing bracket 21 is provided between the brake cover 11 and the rotating disk 10. The steel ball fixing bracket 21 has the same number of mounting holes 22 as the steel balls 14. The steel balls 14 are placed in the mounting holes 22. The steel ball fixing bracket 21 is equivalent to a bearing retainer, which can keep the steel balls 14 moving within the range of the inclined groove 13.

[0035] Furthermore, in order to confine the steel ball 14 within the mounting hole 22 on the steel ball fixing bracket 21, a plurality of elastic locking blocks 23 are provided circumferentially at equal intervals on the inner wall of the mounting hole 22.

[0036] Specifically, the bottom surface of the friction disk 2 is bonded with friction material, which increases the friction when the friction disk 2 and the driven disk 5 come into contact, and makes the power transmission more stable and smooth.

[0037] Various embodiments of this application have now been described in detail. To avoid obscuring the concept of this application, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of this application. The foregoing embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A clutch for a lawnmower, characterised in that, The utility model relates to a kind of engine clutch, including: Engine output shaft, the end of which is fixed with friction disc, the center of the friction disc is formed with transmission column extending up and down, the bottom of the transmission column is hingedly fixed with blade mounting seat, the top of the blade mounting seat is provided with axially movable driven disc, a plurality of engagement springs are provided between the driven disc and the blade mounting seat, and the driven disc abuts against the engagement springs; Engine connecting disc, for fixing the clutch on the engine, the bottom of which is provided with a plurality of bolts, the bolts are sleeved with return springs, the return springs and the engine connecting disc are provided with rotating disc and brake cover, the brake cover is arranged below the rotating disc, the bolts pass through the brake cover and the rotating disc, a plurality of waist-shaped holes are formed in the rotating disc for the movement of the bolts, the return springs abut against the bottom of the brake cover, and the rotating disc is hingedly fixed on the top of the transmission column; A plurality of depth-gradually-changing inclined grooves are formed in the top of the brake cover and the bottom end of the rotating disc, and steel balls are arranged in the inclined grooves, the rotating disc is rotated, the steel balls move in the inclined grooves under the guidance of the inclined grooves, the axial movement of the brake cover can be controlled, the driven disc is driven by the brake cover to contact or separate from the friction disc, and the power transmission clutch is realized.

2. A clutch for a lawnmower as claimed in claim 1, characterised in that A pair of guide columns and a plurality of mounting columns are uniformly distributed around the top of the blade mounting seat, the guide columns pass through the driven disc, the engagement springs are sleeved on the mounting columns, and the driven disc can move axially on the guide columns.

3. A clutch for a lawnmower as claimed in claim 1, characterised in that Through holes are formed in the centers of the driven disc, the blade mounting seat, the brake cover and the rotating disc, the driven disc and the blade mounting seat are sleeved on the lower half of the transmission column, and the brake cover and the rotating disc are sleeved on the upper half of the transmission column.

4. A clutch for a lawnmower as claimed in claim 3, characterised in that Bearings are fixed in the through holes on the blade mounting seat and the rotating disc, and the rotating disc and the blade mounting seat are hingedly fixed on the upper and lower ends of the transmission column, respectively, through the bearings.

5. A clutch for a lawnmower as claimed in claim 1, characterised in that The bottom of the blade mounting seat is fixed with a blade.

6. A clutch for a lawnmower as claimed in claim 1, characterised in that An axially-through plug hole is formed in the center of the transmission column, the engine output shaft is inserted into the plug hole, and is fixed by key groove cooperation and the friction disc.

7. A clutch for a lawnmower as claimed in claim 1, characterised in that A steel ball fixing frame is arranged between the brake cover and the rotating disc, a plurality of mounting holes are formed in the steel ball fixing frame, and the number of the mounting holes is the same as that of the steel balls, the steel balls are arranged in the mounting holes.

8. A clutch for a lawnmower as claimed in claim 7, characterised in that A plurality of elastic clamping blocks are circumferentially and equidistantly arranged on the inner wall of the mounting hole.

9. A clutch for a lawnmower as claimed in claim 1, characterised in that The bottom surface of the friction disc is bonded with friction material.

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