CN208227714U - Grass trimmer and its power drive system - Google Patents

Abstract

The utility model relates to a lawn mower and its power transmission system. The lawn mower includes a body, a cutter and a power transmission system, and the power transmission system includes a driving mechanism; the first transmission mechanism has at least one first connecting arm. The two ends of the first connecting arm are respectively directly or indirectly connected in rotation with the first cutter and the second cutter in the cutter; the second transmission mechanism is configured to be driven by the driving mechanism to drive at least one first connecting arm to move, and then drive At least the first knife reciprocates relative to the second knife to perform cutting work. The above-mentioned power transmission system is rotationally connected with the first cutter and the second cutter in the cutter through at least one first connecting arm at the same time, and the contact point is rolling friction, which avoids the sliding friction caused by the use of traditional guide components, and the rolling friction force It is smaller than the sliding friction, so it can reduce contact wear and transmission loss, and can also reduce noise and prolong service life.

Description

Lawn mower and its power transmission system

technical field

The utility model relates to a cutting device, in particular to a lawnmower and its power transmission system.

Background technique

Lawn mowers mainly include reciprocating and rotary types, and reciprocating lawn mowers are more widely used due to their low cost. A traditional reciprocating lawn mower usually includes a moving knife, a fixed knife, a guide assembly and a transmission mechanism, wherein the guide assembly is arranged on the fixed knife and the moving knife, which includes a guide groove and a guide column/guide block, and the guide column/guide block and The guide grooves can slide relative to each other. The moving knife reciprocates relative to the fixed knife under the action of the transmission mechanism and the guide assembly, so as to realize the shearing work. Due to the sliding friction between the guide column/guide block and the guide groove, the friction force is relatively large, there is noise and high energy consumption, and it is easy to wear and tear to reduce the service life of the cutter.

Utility model content

Based on this, it is necessary to provide a lawn mower and a power transmission system thereof for at least one of the above technical problems.

A lawnmower comprising:

Ontology;

A cutter having a first cutter and a second cutter capable of relatively reciprocating movement for performing cutting work;

A power transmission system, arranged on the body, configured to drive at least the first cutter in the cutter to reciprocate relative to the second cutter;

Wherein, the power transmission system includes:

a driving mechanism for providing a driving force;

The first transmission mechanism has at least one first connecting arm, the first connecting arm includes a first end portion and a second end portion oppositely arranged, the first end portion is rotatably connected to the first cutter, the the second end is directly or indirectly rotatably connected to the second cutter;

The second transmission mechanism is configured to be driven by the driving mechanism to drive at least one of the first connecting arms to move, and then drive at least the first tool directly or indirectly rotatably connected to the first connecting arm relative to the second tool Do reciprocating motion for cutting work.

The above-mentioned power transmission system is rotationally connected with the first cutter and the second cutter in the cutter through at least one first connecting arm at the same time, and the contact point is rolling friction, which avoids the sliding friction caused by the use of traditional guide components, and the rolling friction force It is smaller than the sliding friction, so it can reduce contact wear and transmission loss, and can also reduce noise and prolong service life.

In one of the embodiments, the second cutter is connected to the second end through a connecting plate, and the two ends of the first connecting arm are connected to the first connecting arm through a first connecting piece and a second connecting piece respectively. The tool is rotatably connected to the connecting plate;

A first rotary sleeve is provided between the first connecting piece, the first end and the first tool;

A second rotary sleeve is provided between the second connecting piece, the second end and the connecting plate.

In one of the embodiments, the first rotary sleeve and/or the second rotary sleeve are copper sleeves or bearings.

In one of the embodiments, the first connecting member and the second connecting member correspond to a first pin shaft and a second pin shaft respectively, and the two ends of the first link pass through the first pin shaft and the second pin shaft. The two pin shafts are respectively hinged with the first cutter and the connecting plate.

In one of the embodiments, the number of the first connecting arms is two, and the first cutter, the connecting plate and the two first connecting arms form a connecting rod mechanism; the second transmission mechanism and at least The middle portion of one of the first connecting arms is connected.

In one of the embodiments, both ends of the first connecting arm are respectively rotatably connected to the first knife and the second knife through a third connecting piece and a fourth connecting piece;

A third rotary sleeve is provided between the third connecting piece, the first end and the first tool;

A fourth rotary sleeve is provided between the fourth connecting piece, the second end and the second tool;

The first cutter, the second cutter and the two first connecting arms form a link mechanism.

In one of the embodiments, the linkage mechanism is a parallel four-bar linkage mechanism, and the first cutter can perform linear reciprocating motion along the long axis direction of the second cutter relative to the second cutter.

In one of the embodiments, the second transmission mechanism includes:

a crank configured to be driven by the drive mechanism to transmit drive force;

The rocker is configured to be driven by the crank, and then drive the first connecting arm connected with the rocker to move.

In one embodiment, the crank is an eccentric wheel, and when the eccentric wheel rotates once, the first knife in the cutter is just driven to reciprocate for one cycle.

In one of the embodiments, the drive mechanism includes:

motor;

A reduction box assembly configured to transmit the driving force of the motor to the crank.

In one of the embodiments, the power transmission system also includes:

The supporting frame is configured to provide support for the driving mechanism, and the supporting frame is arranged on the cutter.

The utility model also provides a power transmission system, including:

a driving mechanism for providing a driving force;

The first transmission mechanism has at least one first connecting arm, the first connecting arm includes a first end portion and a second end portion disposed opposite to each other, the first end portion is directly or indirectly connected to the first cutter in the cutter is rotatably connected, the second end is directly or indirectly rotatably connected to the second cutter in the cutter;

The second transmission mechanism is configured to be driven by the drive mechanism to drive at least one of the first connecting arms to move, and then drive at least the first cutter directly or indirectly rotationally connected to the first connecting arm to reciprocate relative to the second cutter movement for cutting work.

Description of drawings

Fig. 1 is a perspective view of an embodiment of a power transmission system of the present invention;

Fig. 2 is the explosion diagram of Fig. 1;

Fig. 3 is the top view of part mechanism in Fig. 1;

4a-4d are top views of the power transmission system of the present invention when the cutter is in different working positions during the cutting process.

The corresponding numbers in the figure are as follows:

100. Driving mechanism 110. Motor 120. Gear box assembly

200, the first transmission mechanism 210, the first connecting arm 300, the second transmission mechanism

310, crank 320, rocker 400, cutter

410, the first cutter 420, the second cutter 510, the first connecting piece

520, the second connecting piece 530, the first rotary sleeve 540, the second rotary sleeve

600, even board

Detailed ways

In order to make the above purpose, features and advantages of the present utility model more obvious and understandable, the specific implementation of the present utility model will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a full understanding of the present invention. However, the utility model can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below limit.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements can also be present. When an element is considered to be "connected" to another element, it may be directly connected to the other element or intervening elements may also be present.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of this invention. The terms used herein in the description of the utility model are only for the purpose of describing specific embodiments, and are not intended to limit the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example 1

A lawn mower includes a body, a cutter 400 and a power transmission system arranged on the body.

As shown in FIGS. 1-3 , the cutter 400 is used for cutting. It has a first cutter 410 and a second cutter 420 capable of relative reciprocating movement. The first cutter 410 and the second cutter 420 are preferably arranged parallel to each other. The power transmission system is arranged on the cutter 400 and connected with the cutter 400 , and can drive at least the first cutter 410 in the cutter 400 to reciprocate relative to the second cutter 420 . In this embodiment, the lawn mower is preferably an intelligent lawn mower.

Continuing to refer to the figure, the power transmission system includes a driving mechanism 100 , a first transmission mechanism 200 and a second transmission mechanism 300 . The driving mechanism 100 is used to provide driving force for the power transmission system. The first transmission mechanism 200 has at least one first connecting arm 210, and the second transmission mechanism 300 is driven by the driving mechanism 100 to drive the at least one first connecting arm 210 to move, and then drives and The first connecting arm 210 is directly or indirectly connected to at least the first knife 410 to reciprocate relative to the second knife 420 for cutting.

In this embodiment, the first transmission mechanism 200 has two first connecting arms 210 , and each first connecting arm 210 may include a first end portion and a second end portion disposed opposite to each other. Since there are two first connecting arms 210, the first cutter 410, the connecting plate 600 and the two first connecting arms 210 can form a four-bar linkage mechanism.

Further, the first end is directly or indirectly rotatably connected to the first cutter 410 in the cutter 400 , and the second end is directly or indirectly rotatably connected to the second cutter 420 in the cutter 400 .

In this embodiment, the first cutter 410 is directly rotatably connected to the first end, and the second cutter 420 is rotatably connected to the second end through the connecting plate 600 . Specifically, both ends of the first connecting arm 210 can be rotatably connected to the first cutter 410 and the connecting plate 600 through the first connecting member 510 and the second connecting member 520 respectively.

At least one first connecting arm 210 is rotationally connected with the first knife 410 and the second knife 420 in the cutter 400 at the same time, and the contact point is rolling friction, which avoids the sliding friction caused by using the traditional guide assembly, and the rolling friction force is less than Sliding friction, so it can reduce contact wear and transmission loss, but also reduce noise and prolong the service life of the entire device.

In this embodiment, a first rotary sleeve 530 may be provided between the first connecting piece 510 and the first end and the first cutter 410 , and between the second connecting piece 520 and the second end and the connecting plate 600 A second rotating sleeve 540 is provided. Specifically, the first rotary sleeve 530 and the second rotary sleeve 540 are sleeved on the first connecting piece 510 and the second connecting piece 520 respectively. The second rotating sleeve 540 is in contact with the second end and the connecting plate 600 respectively. In one embodiment, the first rotating sleeve 530 and/or the second rotating sleeve 540 may be copper sleeves or bearings. In this way, the rolling friction of the rotating connection can be further reduced by adding the swivel sleeve, reducing wear and transmission loss.

In one embodiment, the first connecting member 510 and the second connecting member 520 correspond to the first pin shaft and the second pin shaft respectively, and the two ends of the first connecting arm 210 pass through the first pin shaft and the second pin shaft respectively. It is hinged with the first cutter 410 and the connecting plate 600 . Specifically, the first end and the first cutter 410 may be respectively provided with a first through hole and a second through hole through which one end of the first pin shaft passes, and the second end and the connecting plate 600 are respectively provided with a One end of the second pin shaft passes through the third through hole and the fourth through hole. At this time, the first pin shaft passes through the first through hole and the second through hole, and the second pin shaft passes through the third through hole and the fourth through hole, so that the two ends of the first connecting arm 210 are connected to the first through hole respectively. The cutter 410 and the connecting plate 600 are hinged. In addition, in order to prevent the cutter 400 or the first connecting arm 210 from shaking and disengaging during the cutting process, axial fasteners are installed at the ends of the free ends of the first pin shaft and the second pin shaft. fastening nuts or other fastening elements.

In this embodiment, the first connecting arm 210 is straight, and the first end and the second end are respectively two ends of the straight first connecting arm 210 .

In one embodiment, the link mechanism is a parallelogram mechanism. Specifically, as shown in FIG. 3 , the line defining the connection between the first ends of the two first connecting arms 210 and the first cutter 410 is L1, and the connecting line between the second ends of the two first connecting arms 210 and the second The connecting line where the cutter 420 is directly or indirectly connected is L2. Set L1 and L2 parallel to each other and L1 is consistent with the reciprocating direction of the tool. Therefore, the link mechanism formed at this time is a parallel four-bar link mechanism. In this way, no matter how the first connecting arm 210 moves, it can drive the first cutter 410 to move relative to the second cutter 420 along the theoretical reciprocating direction of the cutter. When both the first cutter 410 and the second cutter 420 are elongated, the first cutter 410 can reciprocate linearly relative to the second cutter 420 along the long axis of the cutter.

In addition, when the above-mentioned link mechanism is a parallel four-bar link mechanism, corresponding automatic height adjustment can be performed according to the height of the cutting plane, which improves cutting efficiency and accuracy.

In this embodiment, as shown in Figures 1-3, the second transmission mechanism 300 includes a crank 310 and a rocker 320, which are driven by the drive mechanism 100 to drive at least one first connecting arm 210 to move, and then drive the first connecting arm 210 to move. At least the first cutter 410 directly or indirectly connected to the arm 210 reciprocates relative to the second cutter 420 to perform cutting work. The above-mentioned second transmission mechanism 300 may be connected to the middle portion of at least one first connecting arm 210 .

The crank 310 is connected with the driving mechanism 100 and is driven by the driving mechanism 100 to transmit the driving force. In this embodiment, the crank 310 is an eccentric wheel. In other embodiments, the crank 310 may be an eccentric mass or an eccentric rod.

One end of the rocker 320 is connected to at least one first connecting arm 210 , and the other end is connected to the crank 310 . The rocker 320 is driven by the crank 310 , and further drives the first connecting arm 210 connected with the rocker 320 to move. In this embodiment, the rocker 320 is connected to a first connecting arm 210 . Specifically, the rocker 320 may be connected to the middle portion of the first connecting arm 210 , and the connection point thereof may be located between the first end portion and the second end portion. This connection can be a fastening connection. In this way, the movement of the first transmission mechanism 200 is more convenient. In addition, a swivel sleeve can also be provided at the hinge to reduce the amount of wear of the transmission mechanism at the hinge. In other embodiments, the second transmission mechanism 300 can also include an intermediate rod, and the two ends of the intermediate rod are respectively connected to the rocker 320 and the first connecting arm 210. At this time, the rocker 320 can be connected to at least two first The connecting arms 210 are connected to drive a plurality of first connecting arms 210 to move.

In one embodiment, when the crank 310 is an eccentric wheel, when the eccentric wheel rotates once, the first cutter 410 in the cutter 400 is just driven to reciprocate for one cycle.

In this embodiment, as shown in FIGS. 1-3 , the driving mechanism 100 includes a motor 110 and a reduction box assembly 120 connected to the motor 110 . The reduction box assembly 120 is connected to the crank 310 in the second transmission mechanism 300 , and it transmits the driving force of the motor 110 to the crank 310 in the second transmission mechanism 300 . The motor 110 can be a motor of a commonly used type in the field, and the reduction box assembly 120 can be a gear reduction box, which can include a mounting frame, a casing disposed on the mounting frame, a first input shaft disposed on the casing, and a first The output shaft and the gear set arranged inside the box body. In this embodiment, the mounting frame can be installed on the connecting plate 600, the rocker 320 is arranged between the mounting frame and the connecting plate 600 and passes through between the mounting frame, and the rocking rod 320 is provided on the mounting frame to allow the rocking rod 320 to reciprocate. In this way, the normal cutting work can be guaranteed, and the structure of the whole device can be made more compact. Of course, in other embodiments, the mounting frame can be installed in other suitable positions.

The first input shaft and the first output shaft are respectively connected with the output shaft of the motor and the crank 310, the output shaft of the motor rotates in the circumferential direction, and drives the first output shaft to rotate through the gear transmission of the reduction box assembly 120, and then drives the crank 310 Rotate, and then convert the rotation of the crank 310 into the reciprocating swing of the rocker 320 through the second transmission mechanism 300, and then drive the first connecting arm 210 connected to the rocking rod 320 to move, and finally drive the cutter connected to the first connecting arm 210 The knives in 400 do reciprocating motion to realize the cutting work.

In this embodiment, the number of the first transmission mechanism 200 and the second transmission mechanism 300 are the same and one. In other embodiments, the number of the first transmission mechanism 200 and the number of the second transmission mechanism 300 may be different, or may be other multiples. In this way, when there are other numbers of the first transmission mechanism 200 and the second transmission mechanism 300, the power transmission can be carried out through the control of the first transmission mechanism 200 and the second transmission mechanism 300 respectively; Make transition connections for power transfer.

In this embodiment, the first cutter 410 and the second cutter 420 are respectively a movable cutter and a fixed cutter, and at this moment, the first cutter 410 can perform a single reciprocating movement relative to the second cutter 420 . At this moment, the second cutter 420 is connected with the body. In yet another embodiment, both the first cutter 410 and the second cutter 420 are movable cutters, both of which can be driven to perform relative double reciprocating motions, and their moving directions can be the same or opposite. When the moving directions of the two are opposite, the moving speed of the first cutter 410 and the second cutter 420 is not limited. When both move in the same direction, the first cutter 410 and the second cutter 420 should have different moving speeds, so that there is a relative reciprocating motion between the first cutter 410 and the second cutter 420 . Certainly, in another embodiment, the first cutter 410 and the second cutter 420 may also be fixed cutters and movable cutters respectively, and at this time, the second cutter 420 can perform a single reciprocating movement relative to the first cutter 410 .

The blade shapes of the first cutter 410 and the second cutter 420 are preferably the same, and both may be generally linear. In other embodiments, both of them can also be circular arc or wavy line or other same or different blade shapes that meet the cutting conditions. When the two cutters are arc-shaped, the power transmission system can drive one of the cutters to perform a reciprocating arc motion relative to the other cutter.

In one embodiment, the blade quality and thickness of the first cutter 410 and the second cutter 420 may be the same. In another embodiment, when the first cutter 410 and the second cutter 420 are respectively a movable cutter and a fixed cutter, the mass and thickness of the blade of the movable cutter are both smaller than those of the fixed cutter. In this way, the friction between the movable knife and the fixed knife can be further reduced, the overall stability of the cutter 400 can be improved, and the noise can be reduced.

In one embodiment, at least one of the first cutter 410 and the second cutter 420 is provided with a groove on a contact surface. The grooves can be hollow grooves or blind grooves. In this way, the contact area between the first blade and the second blade can be reduced, thereby reducing the sliding friction between the first blade and the second blade. The groove may be provided on the second cutter 420 and/or on the second cutter 420 . In this embodiment, the groove is provided on the second cutter 420 .

The implementation of the cutting process in an implementation manner of this embodiment will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1-3, the motor is connected to the reduction box assembly 120, the first output shaft of the reduction box assembly 120 is connected to the eccentric wheel, the eccentric wheel is connected to the rocker 320 through a bearing, two rocker arms, a connecting plate 600 and The first cutter 410 is connected to form a parallel four-bar linkage mechanism, the rocker 320 is connected to one of the first connecting arms 210, and the second cutter 420 (fixed cutter) is located below the first cutter 410 (moving cutter) and fastened by, for example, bolts The piece is connected with the connecting plate 600. When the motor rotates to drive the rocker 320 through the eccentric wheel, the rocker 320 drives the first connecting arm 210, so that the first cutter 410 in the four-bar linkage mechanism composed of the first connecting arm 210 and the like is reciprocated relative to the second cutter 420, Realize the cutting function.

Fig. 3 and Fig. 4a to Fig. 4d are top views when the cutter is in different working positions during the cutting process. FIG. 3 shows the initial position of the first cutter 410 . Figure 4a shows that the counterclockwise movement of the eccentric wheel drives the rocker 320 to move, the rocker 320 pushes the four-bar linkage mechanism to move to the left, and the first cutter 410 moves to the left, at this time the first cutter 410 moves to the leftmost position. Fig. 4b shows that the counterclockwise movement of the eccentric wheel drives the rocker 320 to move, the rocker 320 pushes the four-bar linkage mechanism to move to the right, and the first cutter 410 moves to the right, at this time the first cutter 410 returns to the initial position. Figure 4c shows that the counterclockwise movement of the eccentric wheel drives the rocker 320 to move, the rocker 320 pushes the four-bar linkage mechanism to move to the right, and the first cutter 410 moves to the right, at this time the first cutter 410 moves to the rightmost position. Figure 4d shows that the counterclockwise movement of the eccentric wheel drives the rocker 320 to move, the rocker 320 pushes the four-bar linkage mechanism to move to the left, and the first cutter 410 moves to the left, at this time the first cutter 410 returns to the initial position. The above eccentric wheel rotates once to make the moving knife reciprocate one cycle from left to right, realizing the cutting function.

As a modification, one of the first end portion and the first cutter 410 is provided with a first column (not shown), and the other is provided with a through hole capable of inserting the first column. One of the second end portion and the connecting plate 600 is provided with a second column (not shown), and the other is provided with a through hole capable of inserting the second column. In this way, the first post and the second post can be inserted into corresponding through holes, so as to realize the rotational connection between the first connecting arm 210 and the first cutter 410 and the connecting plate 600 . In this way, the normal cutting work can be guaranteed, and the structure of the whole device can also be made more compact. Of course, in other implementation manners, the installation frame can be installed in other suitable positions.

Further, a rotating sleeve may be provided on the outer wall of the first column where it contacts the first cutter 410 and the second cutter 420, and the rotating sleeve may be a copper sleeve or a bearing. In this way, the rolling friction between the first connecting arm 210 and the cutter 400 can be reduced through the rotating sleeve, further reducing noise and improving service life.

As a variant, different from the linear shape of the first connecting arm 210 in the above embodiments, in this embodiment, the first connecting arm 210 may be in a zigzag shape or an arc shape or other suitable shapes. When the first connecting arm 210 is in the shape of a broken line, the two ends of the first connecting arm 210 can be connected with the two knives in the cutter 400. 600/the second tool 420 constitutes a four-bar linkage mechanism.

As a modified solution, the number of the first connecting arm 210 is one. The first connecting arm 210 is directly or indirectly connected to the first cutter 410 and the second cutter 420 on the cutter 400 .

As another variation, the number of the first connecting arms 210 is 3 or more. At this time, the components connected to the first connecting arm 210 can be increased or adjusted accordingly.

As a modified solution, the cutter 400 further includes at least a third cutter, and the third cutter can be stacked with the first and second cutters. The first transmission mechanism 200 is connected with several knives in the cutter 400 to control at least three knives in the cutter 400 to perform relative reciprocating motion, which can improve the cutting efficiency.

As a variant, the first end and the second end are not limited to be disposed at two end positions of the first connecting arm 210 . The two can be arranged at the middle position of the first connecting arm 210 , at this time, the connection between the first connecting arm 210 and the cutter 400 is not limited to the two end positions of the first connecting arm 210 . In addition, the rocker 320 is connected to the middle position of the first connecting arm 210. The middle position may be a position set between the first end and the second end, or a position far away from the first end or the second end. position of the end.

As a modified solution, the power transmission system further includes a support frame (not shown), which provides support for the driving mechanism 100 , and the support frame is arranged on the cutter 400 . At this time, the driving mechanism 100 may only include a motor, and the motor may be placed on the support frame. Specifically, the support frame is composed of several support rods and a support platform, the support rods are arranged on the connecting plate 600 , and the support platform is used to support the driving mechanism 100 . A swing gap of the matching rocker 320 is provided between several support rods.

As another solution, the connecting plate 600 is not provided, and the two ends of the first connecting arm 210 may be directly connected to the first cutter 410 and the second cutter 420 . Specifically, both ends of the first connecting arm 210 can be rotatably connected to the first cutter 410 and the second cutter 420 respectively through a third connecting member (not shown) and a fourth connecting member (not shown). A third rotary sleeve is provided between the third connecting piece and the first end portion and the first cutter 410 ; a fourth rotary sleeve is provided between the fourth connecting piece and the second end portion and the second cutter 420 . Specifically, the third rotary sleeve and the fourth rotary sleeve can be sleeved on the third connecting piece and the fourth connecting piece respectively. At this time, the third rotating sleeve is in contact with the first connecting piece and the first tool respectively, The rotating sleeve is in contact with the second end and the second tool respectively. In one embodiment, the first rotating sleeve 530 and/or the second rotating sleeve 540 may be copper sleeves or bearings. In this way, the rolling friction of the rotating connection can be further reduced by adding the swivel sleeve, reducing wear and transmission loss.

Likewise, a transition piece may be provided between the first cutter 410 and the first connecting arm 210 , and the connection between the first cutter 410 and the first connecting arm 210 is realized through the transition piece.

Further, the third connecting member and the fourth connecting member may be pin shaft structures. On the first end portion and the first tool 410 and on the second end portion and the second tool 420 , there are respectively provided through holes through which one end of the corresponding pin shaft passes. At this time, the pin shafts pass through their respective through holes, so as to achieve hinged connection between the two ends of the first connecting arm 210 and the first cutter 410 and the second cutter 420 respectively. Of course, in order to prevent the cutter 400 or the first connecting arm 210 from shaking and disengaging during the cutting process, an axial fastener is installed at the end of the free end of the pin shaft, which can be a commonly used fastening nut or other fastening elements. solid components. Certainly, in another implementation manner, the third connecting member and the fourth connecting member may have a structure similar to that of the above-mentioned first column and the second column, which will not be repeated here.

Further, the first cutter 410, the second cutter 420 and the two first connecting arms 210 form a link mechanism. The rocker 320 in the second transmission mechanism 300 can be connected with the middle part of the first connecting arm 210 . The specific content is similar to that of Embodiment 1, and will not be repeated here.

The various technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the utility model, and the description thereof is relatively specific and detailed, but it should not be interpreted as a limitation on the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (11)

1. a kind of grass trimmer, comprising:

Ontology；

Cutter has the first cutter and the second cutter that can be done relatively reciprocating motion, for executing cutting work；

Power drive system is arranged on the body, and is configured to drive in the cutter at least the first cutter relative to Two cutters move reciprocatingly；

It is characterized in that, the power drive system includes:

Driving mechanism, to provide driving force；

First transmission mechanism, has at least one first link arm, and first link arm includes the first end being oppositely arranged and the Two ends, the first end and first cutter are rotatablely connected, the second end and second cutter directly or Ground connection rotation connection；

Second transmission mechanism is configured to be driven by the driving mechanism to drive at least one described first link arm movement, in turn Drive moves reciprocatingly at least the first cutter that first link arm is directly or indirectly rotatablely connected relative to the second cutter, To carry out cutting work.

2. grass trimmer according to claim 1, which is characterized in that second cutter passes through connecting plate and the second end Connection, the both ends of first link arm pass through the first connector and the second connector and first cutter and the company respectively Plate rotation connection；

The first pivoted housing is equipped between first connector and the first end and first cutter；

The second pivoted housing is equipped between second connector and the second end and the connecting plate.

3. grass trimmer according to claim 2, which is characterized in that first pivoted housing and/second pivoted housing are copper sheathing Or bearing；And/or

First connector and second connector respectively correspond as the first pin shaft and the second pin shaft, first link arm Both ends are hinged with first cutter and the connecting plate respectively by the first pin shaft and the second pin shaft.

4. grass trimmer according to claim 2, which is characterized in that the number of first link arm be two, described first Cutter, connecting plate and two first link arms form link mechanism；Second transmission mechanism and at least one described first company The middle part of arm connects.

5. grass trimmer according to claim 1, which is characterized in that the both ends of first link arm pass through third connector It is rotatablely connected respectively with first cutter and second cutter with the 4th connector；

Third pivoted housing is equipped between the third connector and the first end and first cutter；

The 4th pivoted housing is equipped between the 4th connector and the second end and second cutter；

First cutter, the second cutter and two first link arms form link mechanism.

6. grass trimmer according to claim 4 or 5, which is characterized in that the link mechanism is parallel four-bar linkage, institute State the linear reciprocating motion for the long axis direction that the first cutter can be done relative to second cutter along second cutter.

7. grass trimmer according to claim 1, which is characterized in that second transmission mechanism includes:

Crank is configured to be driven by the driving mechanism to transmit driving force；

Rocking bar is configured to by the crank handle turns, and then drives first link arm movement connecting with the rocking bar.

8. grass trimmer according to claim 7, which is characterized in that the crank is eccentric wheel, the eccentric wheel rotation one Zhou Shi, the first cutter in cutter move back and forth a cycle by driving.

9. grass trimmer according to claim 7 or 8, which is characterized in that the driving mechanism includes:

Motor；

Reduction gearbox assembly is configured to the driving force of the motor passing to the crank.

10. grass trimmer according to claim 1, which is characterized in that the power drive system further include:

Support frame is configured as the driving mechanism and provides support, and support frame as described above is set on the cutter.

11. a kind of power drive system characterized by comprising

Driving mechanism, to provide driving force；

First transmission mechanism, has at least one first link arm, and first link arm includes the first end being oppositely arranged and the Two ends, the first end are directly or indirectly rotatablely connected with the first cutter in cutter, the second end with cut The second cutter in cutter is directly or indirectly rotatablely connected；

Second transmission mechanism is configured to be driven by driving mechanism to drive at least one described first link arm movement, and then drives Move reciprocatingly at least the first cutter that first link arm is directly or indirectly rotatablely connected relative to the second cutter, with into Row cutting work.