CN105981528B

CN105981528B - Mower and clutch thereof

Info

Publication number: CN105981528B
Application number: CN201510057208.1A
Authority: CN
Inventors: 蒋向咚; 黄文发; 周明伟; 阿伦·马德里
Original assignee: Dechang Electric Machinery (shenzhen) Co Ltd
Current assignee: Dechang Electric Machinery (shenzhen) Co Ltd
Priority date: 2015-02-03
Filing date: 2015-02-03
Publication date: 2020-01-07
Anticipated expiration: 2035-02-03
Also published as: CN105981528A

Abstract

A mower comprises an engine, a cutter head, a belt and a clutch, wherein the clutch comprises a motor, a gear box, a traction mechanism and a clutch pulley, the traction mechanism comprises a screw, a fastener screwed on the screw and a connecting block acting with the fastener, the first end of the screw is far away from the gear box, the second end of the screw is connected with the gear box, the motor is started to drive the screw to rotate after being decelerated by the gear box, the screw rotates to drive the fastener to move along the axial direction of the screw, the fastener moves towards the first end of the screw along the first direction and moves towards the second end of the screw along the second direction after being hooked with the connecting block to drive the connecting block and pull the clutch pulley to move from the first position to the second position, the belt is tensioned, the engine drives the cutter head to rotate, and the fastener loosens the connecting block to move and reset along the first direction after the connecting block is loosened, the clutch pulley is reset from the second position to the first position, the belt is loosened, the engine cannot drive the cutter head, and the clutch pulley is simple and labor-saving to operate and more attractive.

Description

Mower and clutch thereof

Technical Field

The present invention relates to lawnmowers, and more particularly to clutches for transmitting power between an engine and a cutter head of a lawnmower.

Background

Lawn mowers are widely used to trim and dress lawns to keep them flat. The existing mower generally comprises an engine, a cutter head and a clutch, wherein the engine is used as a power source, the cutter head is driven by a belt in a transmission mode, the clutch enables a belt to be tensioned or loosened, the engine drives the cutter head to rotate to mow when the belt is tensioned, and the transmission between the engine and the cutter head is disconnected when the belt is loosened. The existing clutch is usually operated and controlled by a user through a handle lever, is labor-consuming in operation and is not attractive enough in appearance.

Disclosure of Invention

The invention provides a simple and labor-saving mower and a clutch thereof.

A clutch comprises a motor, a gear box connected with the motor, a traction mechanism connected with the gear box, and a clutch pulley connected with the traction mechanism, the traction mechanism comprises a screw rod, a fastener screwed on the screw rod and a connecting block acting with the fastener, the first end of the screw rod is far away from the gear box, the second end of the screw rod is connected with the gear box, the motor is started to drive the screw rod to rotate after being decelerated by the gear box, the screw rod rotates to drive the fastener to move along the axial direction of the screw rod, the fastener moves towards the first end of the screw rod along the first direction, and the connecting block is hooked and then moves towards the second end of the screw rod along the second direction to drive the connecting block and pull the clutch pulley to move from the first position to the second position, the fastener loosens the connecting block, then the connecting block moves along the first direction to reset, and the clutch pulley resets from the second position to the first position.

A mower comprises an engine, a cutter head, a belt and a clutch, wherein a driving pulley is fixedly connected to an output shaft of the engine, the cutter head is fixedly connected to a driven pulley through a central shaft, the belt is arranged on the driving pulley and the driven pulley, the clutch comprises a motor, a gear box connected with the motor, a traction mechanism connected with the gear box and a clutch pulley connected with the traction mechanism, the traction mechanism comprises a screw rod, a fastener screwed on the screw rod and a connecting block acting with the fastener, the gear box is far away from a first end of the screw rod, a second end of the screw rod is connected with the gear box, the motor is started to drive the screw rod to rotate after being decelerated by the gear box, the screw rod drives the fastener to move along the axial direction of the screw rod, the fastener moves towards the first end of the screw rod along a first direction and moves towards a second end of the screw rod along a second direction after being hooked with the connecting block, the connecting block is driven and pulled, the clutch pulley is moved to the second position from the first position, the belt is tensioned, the engine drives the cutter head to rotate, the fastener loosens the connecting block, the connecting block is moved to reset along the first direction, the clutch pulley is reset to the first position from the second position, the belt is loosened, and the engine cannot drive the cutter head.

The clutch of the mower takes the motor as a power source, drives the clutch pulley of the clutch to move to tension or loosen the belt pulley, and compared with the prior art in which a handle lever needs to be manually operated, the clutch of the mower has simpler and more labor-saving operation by a user, and the appearance of the mower is more attractive by canceling the handle lever.

Drawings

The following detailed description of specific embodiments of the invention is provided in connection with the accompanying drawings. It is to be understood that the drawings are provided solely for the purposes of reference and illustration and are not intended as a definition of the limits of the invention. The dimensions shown in the figures are for clarity of description only and are not to be taken in a limiting sense.

FIG. 1 is a schematic view of a lawn mower according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of the transmission mode of the mower.

Fig. 3 is a perspective view of a clutch of the lawn mower.

Fig. 4 is a schematic structural diagram of the traction mechanism of the clutch with the outer casing removed.

FIG. 5 is a diagram of the elements of the traction mechanism with the clutch disengaged.

Fig. 6-8 are schematic views showing the action process of the traction mechanism when the clutch is in a separation state and a combination state.

Fig. 9-10 are schematic views showing the operation process of the traction mechanism when the clutch is in an engaged state and a disengaged state.

Detailed Description

As shown in fig. 1, a lawn mower 100 according to a preferred embodiment of the present invention includes an engine 10, a cutter head 30 driven by the engine, and a clutch 50.

Referring to fig. 2, the engine 10 drives the cutter head 30 to rotate through the belt 20, and the cutter head 30 may be single or multiple. In this embodiment, a driving pulley 14 is fixedly connected to the output shaft 12 of the engine 10, the number of the cutter heads 30 is 2, each cutter head 30 is fixedly connected to a central shaft 34 of a driven pulley 32, and the belt 20 is installed on the driving pulley 14 and the driven pulley 32. As shown in fig. 3, the clutch 50 includes a motor 52, a gear box 54, a traction mechanism 56, and a clutch pulley 58. Preferably, the motor 52 is a permanent magnet dc motor, the gear box 54 is engaged with a rotating shaft of the motor 52 to reduce the speed of the rotation of the motor 52 and output the reduced speed, and the traction mechanism 56 is driven between the gear box 54 and the clutch pulley 58 to drive the clutch pulley 58 to move between the first position and the second position, so as to separate from or abut against the belt 20, thereby loosening or tightening the belt 20.

Preferably, the input control end of the motor 52 is connected to a controller (not shown), an operation panel 11 (see fig. 1) connected to the controller is disposed on the body of the lawn mower 100, a user inputs an instruction through a key on the operation panel 11, and the controller controls the start and stop of the motor 52 according to the instruction input by the user. The clutch pulley 58 is fixedly connected to the end of a lever 40, and the lever 40 is connected to the traction mechanism 56. When the clutch 50 is in the disengaged state, the clutch pulley 58 is in the first position, as shown by the solid line in fig. 2, and is disengaged from the belt 20, the belt 20 is in the slack state, and the engine 10 cannot drive the cutter head 30 to rotate; when the clutch 50 is engaged, as shown by the dashed lines in fig. 2, it is pulled to a second position by the pulling mechanism 56, and it abuts against the belt 20, so that the belt 20 is tensioned, and the rotation of the engine 10 is transmitted to the cutter head 30 through the belt 20 to rotate it.

Referring to fig. 4, the pulling mechanism 56 includes a housing 60, a bracket 62 disposed in the housing 60, a screw 64 rotatably connected to the bracket 62, a fastener 66 linearly movable with respect to the screw 64, a connecting block 68 acting on the fastener 66, and a pulling rope 70 connected to the connecting block 68.

The housing 60 may be connected to the gear box 54 and the motor 52 by fasteners such as screws, and the bracket 62 is fixed in the housing 60. in some embodiments, the bracket 62 may also be integrally formed with the housing 60 as a part of the housing 60. In this embodiment, the bracket 62 includes an elongated base plate 72, and a first end plate 74 and a second end plate 76 perpendicular to the base plate 72 are respectively formed at two ends of the base plate 72, wherein the first end plate 74 is integrally extended from the base plate 72, and the second end plate 76 is a separate element and is connected to the base plate 72 through a fixing member. In some embodiments, the first end plate 74 may be a separate component attached to the base plate 72, and the second end plate 76 may be integrally formed with the base plate 72.

The screw 64 is parallelly erected on the base plate 72 of the bracket 62, and the axial direction of the screw 64 is consistent with the length direction of the base plate 72. A shaft hole 740 is formed in the center of the first end plate 74, a bushing is disposed in the shaft hole 740, and the tip end of the screw rod 64 is rotatably inserted into the bushing. A through hole 760 is formed in the center of the second end plate 76, and the bottom end of the screw 64 is pivotally connected to the gear box 54 after passing through the through hole 760, so that the rotation of the motor 52 is decelerated by the gear box 54 to drive the screw 64 to rotate at a relatively low speed.

The second end plate 76 extends axially upward on either side of the through-hole 760, i.e., toward the first end plate 74, to form two stops 78, the two stops 78 being symmetrically disposed and spaced from the outer edge of the through-hole 760. Each stopper 78 has an inner side 780 facing the screw 64, the inner side 780 is an outward-expanding slope, the distance between the two inner sides 780 gradually increases along the direction away from the second end plate 76, and the minimum distance between the two inner sides 780, that is, the distance between the two inner sides 780 at the joint of the stopper 78 and the second end plate 76, is greater than the diameter of the through hole 760 on the second end plate 76. In this embodiment, the inner side 780 is a curved surface, preferably a portion of a conical surface. In other embodiments, the inner side 780 of the stop 78 may also be planar.

The connecting block 68 is sleeved on the screw 64 and located between the first end plate 74 and the second end plate 76, and can slide along the axial direction relative to the screw 64. In this embodiment, the connecting block 68 is substantially wedge-shaped, and the transverse width of the connecting block 68 gradually decreases along the direction from the first end plate 74 to the second end plate 76, and inclined guide surfaces 680 are formed on the left and right sides of the connecting block 68 to facilitate the action with the fastener 66. In this embodiment, a through hole 742 is formed in the first end plate 74 of the bracket 62, one end of the pull string 70 is connected to the connection block 68 after passing through the through hole 742 of the first end plate 74, and the other end is connected to the lever 40. In some embodiments, the pull cord 70 may be attached directly to the connector block 68 without passing through the one end plate 74 when the first end plate 74 does not obstruct the connection of the connector block 68 to the pull cord 70.

The fastener 66 is screwed on the screw 64 and is positioned between the connecting block 68 and the second end plate 76, and when the screw 64 rotates, the fastener 66 is driven to linearly move along the axial direction of the screw 64 to act with the connecting block 68. In this embodiment, the fastener 66 includes a driving block 82, a pair of clips 84 rotatably connected to the driving block 82, and an elastic member 86 connected to the clips 84.

The driving block 82 is a square structure, and is screwed on the screw rod 64 and carried on the base plate 72. When the screw 64 rotates, the driving block 82 cannot rotate with the screw 64 due to the obstruction of the base plate 72, and the rotation of the screw 64 is converted into the movement of the driving block 82 in the axial direction of the screw 64. The pair of clips 84 are rotatably connected to the left and right sides of the driving block 82 by a pivot 83, respectively. A pivot hole is formed in the center of each clip 84 for the pivot 83 to pass through; the end of the clip 84 facing the upper end of the first end plate 74 forms a hook 85 for interacting with the connecting block 68; the lower end of the clip 84 toward the second end plate 76 is connected to the resilient member 86. In this embodiment, the driving block 82 is connected with a pin 88, the elastic member 86 is a coil spring, and is sleeved on the pin 88, and two ends of the elastic member are respectively fixedly connected with the lower ends of the two clips 84.

When the mower 100 is not started, as shown in fig. 2, the clutch 50 is in a disengaged state, the clutch pulley 58 is in the first position, and is not in contact with the belt 20, and the belt 20 is in a slack state. At this time, as shown in fig. 5, the connecting block 68 is close to the first end plate 74, the part of the traction rope 70 extending out of the clutch has the maximum length, and the traction rope 70 is in a slack state; the fastener 66 is spaced from the connecting block 68 adjacent the second end plate 76. Under the action of the elastic member 86, the upper ends of the two clips 84 are approximately parallel, and the two clips 85 are spaced by a distance which is equal to or slightly larger than the minimum transverse width of the connecting block 68; the lower ends of the clips 84 are disposed in an inclined manner, the included angle between the lower ends is an obtuse angle greater than 90 degrees but less than 180 degrees, and the distance between the outer edges of the ends of the lower ends of the clips 84 is substantially equal to or slightly less than the maximum distance between the inner sides 780 of the stoppers 78.

When the mowing operation is required, a button on the operation panel 11 is pressed, the motor 52 is started, the gear box 54 is decelerated to drive the screw 64 to rotate (for example, rotate clockwise), and then the fastener 66 is driven to move towards the connecting block 68 along the first direction, as shown in fig. 6, when the fastener 66 moves until the clip 84 collides with the connecting block 68, the guide surface 680 of the connecting block 68 forms an outward acting force on the hook 85 of the clip 84, the hook 85 is opened outward to increase the distance between the hooks 85, and the fastener 66 can continue to move upward. Since the clip 84 is rotatably attached to the driving block 82, the lower ends of the clip 84 are moved toward each other while the hooks 85 are opened so that the distance between the lower ends is reduced, and the elastic member 86 is compressed. As the fastening member 66 continues to move upward, as shown in fig. 7, the hook 85 of the fastening member 66 passes over the connecting block 68, and at this time, the acting force of the connecting block 68 on the hook 85 disappears, and under the elastic restoring force of the elastic member 86, the lower end of the clip 84 opens outward, and at the same time, the hook 85 closes inward, and the clip 84 snaps on the end face 682 of the connecting block 68, and the clip 84 returns to the state shown in fig. 5.

After the fastener 66 is hooked with the connecting block 68, the motor 52 rotates in a reverse direction (e.g., counterclockwise), so as to drive the fastener 66 to move toward the second end plate 76 in the second direction, the fastener 66 moves downward to drive the connecting block 68 to move synchronously, and the pulling rope 70 is pulled to move, which corresponds to increasing the distance between the two ends of the pulling rope 70, and the pulling rope 70 pulls and drives the clutch pulley 58 to move toward the second position. When the catch 66 moves down into contact with the stop 78, the clutch pulley 58 is pulled to a second position against the belt 20, tensioning the belt 20 and engaging the clutch 50, as shown in fig. 8. At this time, the motor 52 stops rotating, the fastener 66 no longer moves, the clutch pulley 58 is kept at the second position, and the engine 10 is started to drive the cutter head 30 to work through the belt 20.

After the mowing operation is completed, the motor 52 is started again to rotate counterclockwise, the fastener 66 is driven to move further downwards, at this time, as shown in fig. 9, the lower end portions of the clips 84 of the fastener 66 enter between the two stoppers 78, along with the downward movement of the fastener 66, under the action of the inner side surfaces 780 of the stoppers 78, the lower end portions of the clips 84 move towards each other again, the elastic members 86 are compressed, meanwhile, the hooks 85 at the upper end portions of the clips 84 are opened to be separated from the end surfaces 682 of the connecting blocks 68, at this time, under the tension of the tensioned pull rope 70, the pull rope 70 drives the connecting blocks 68 to move towards the first end plate 74 quickly to return, as shown in fig. 10. When the connecting block 68 is reset, the pulling action of the traction rope 70 on the clutch pulley 58 is lost, the clutch pulley 58 moves to the first position for resetting, and the clutch 50 returns to the separation state. Thereafter, the motor 52 may be rotated clockwise again for a short time to drive the catch 66 upward to separate from the stopper 78, the force of the stopper 78 on the catch 84 is removed, and the catch 66 is restored to the state shown in fig. 5 by the elastic restoring force of the elastic member 86.

The mower 100 of the invention takes the motor 52 as a power source and drives the clutch pulley 58 of the clutch to move, compared with the prior art that the handle lever needs to be operated manually, the operation of a user is simpler and labor-saving, and the appearance of the mower 100 is more beautiful by eliminating the handle lever; in addition, the clutch drives the fastener 66 through the screw 64 to drive the traction rope 70 to move, and the structure is simple and practical; in addition, the fastener 66 is matched with the connecting block 68, and after the fastener 66 loosens the connecting block 68, the connecting block 68 is driven to reset rapidly by the tension of the traction rope 70, so that additional driving is not needed, and the energy is saved effectively. It should be noted that the present invention is not limited to the above-mentioned embodiments, and other changes and modifications can be made by those skilled in the art according to the spirit of the present invention, and these changes and modifications made according to the spirit of the present invention should be included in the scope of the present invention as claimed.

Claims

1. The utility model provides a clutch, includes the motor, with the gear box that the motor is connected, with the drive mechanism that the gear box is connected and with the separation and reunion pulley that drive mechanism is connected, its characterized in that: traction mechanism include screw rod, spiro union in fastener on the screw rod, with the connecting block of fastener effect, the first end of screw rod is kept away from the gear box, the second end of screw rod with the gear box is connected, and the motor starts to pass through drive after the gear box slows down the screw rod rotates, screw rod rotation drive the axial displacement of fastener along the screw rod, the fastener along the first direction move towards the first end of screw rod, with move towards the second end of screw rod along the second direction behind the connecting block clasp, drive connecting block and pulling separation and reunion pulley move to the second position by the primary importance, and the fastener loosens behind the connecting block moves along the primary importance and resets, and separation and reunion pulley resets to the primary importance by the second place.

2. The clutch of claim 1, wherein the fastener includes a driving block screwed to the screw, a pair of clips rotatably coupled to the driving block, and an elastic member, the clips are formed with a hook and a connecting block toward an upper end of the connecting block, the elastic member is connected between lower ends of the clips away from the connecting block, and the elastic member is compressed when the hooks are opened.

3. The clutch of claim 2, wherein the connecting block is wedge-shaped, the transverse width of the connecting block increases gradually along a first direction, the opposing sides of the connecting block form inclined guide surfaces and hook actions, when the fastener moves along the first direction to touch the connecting block, the hook and guide surfaces act to open the hook, and the hook closes to hook with the connecting block after the hook completely passes over the connecting block.

4. The clutch of claim 2, wherein a pin is fixedly connected to the driving block, the elastic member is a coil spring and is sleeved on the pin, and both ends of the elastic member are fixedly connected to the lower ends of the two clips respectively.

5. The clutch of claim 2, wherein the lower ends of the clips are inclined relative to each other at an obtuse angle.

6. The clutch of claim 5, wherein the screw is pivotally connected to a bracket, the bracket has two stoppers formed at the second end of the screw, the stoppers are symmetrically disposed at two sides of the screw, each stopper has an inner side facing the screw, the distance between the inner sides of the two stoppers increases gradually along the first direction, when the fastener moves along the second direction until the lower end of the clip enters between the stoppers and acts on the inner sides of the stoppers, the hooks of the clip open, the hooks of the clip separate from the connecting block, and the fastener releases the connecting block.

7. The clutch of claim 6, wherein the inner side of the dog is planar or curved.

8. The clutch of claim 6, wherein the connecting block is connected to the clutch pulley via a pulling rope, the bracket includes an elongated base plate, and first and second end plates respectively formed at both ends of the base plate, a first end of the screw is rotatably pivoted to the first end plate, a second end of the screw is pivoted to the gear box after passing through the second end plate, the stopper is formed on the second end plate, and the pulling rope is connected to the connecting block after passing through the first end plate.

9. The clutch according to any one of claims 1 to 8, wherein the connecting block is slidably fitted over the screw.

10. The utility model provides a lawn mower, includes engine, tool bit and belt, a fixed connection drive pulley on the output shaft of engine, the tool bit is through a center pin fixed connection on a driven pulley, the belt is installed on drive pulley and driven pulley, its characterized in that: the clutch of any one of claims 1-9, further comprising a clutch pulley that moves to a second position to tension the belt, the motor rotating the cutter head, and the clutch pulley moves to a first position where the belt is slack and the motor is unable to drive the cutter head.