CN210120175U - Electric tool and main machine thereof - Google Patents

Abstract

The utility model discloses an electric tool, comprising: a motor, which drives a working component used for operation; a battery pack, which is used for supplying power to the motor; a casing, where the battery pack is detachably connected to the casing; a locking mechanism is used for connecting the casing body and battery pack, the locking mechanism is mounted to the casing or the battery pack; the locking mechanism has a locked state that locks the battery pack and the casing to form a fixed connection and releases the battery pack so that it can be relative to the casing in a first linear direction The sliding unlocked state; the ejection mechanism, which is matched with the battery pack and applies a driving force along the first linear direction to the battery pack; the ejection mechanism includes: an action element, which is matched with the battery pack; a thrust component, which is connected to the housing and the action element. The utility model can provide an electric tool and its main unit, the battery pack ejection structure is more concise and efficient, and the installation is more convenient.

Description

Power tools and their hosts

technical field

The utility model relates to an electric tool.

Background technique

Commonly used power tools include a battery pack for power supply, and the battery pack is generally installed on the housing of the power tool. As the capacity and weight of the portable battery pack increase, the disassembly and installation structure of the battery pack needs to be optimized accordingly. At present, there are electric tools with a battery pack ejection structure on the market, which are used to disassemble the battery pack more conveniently. However, most battery pack ejection structures have defects such as low reliability, low transmission efficiency, and unstable battery pack installation.

For example, the patent with the publication number CN102729224A shown in FIG. 1 discloses an auxiliary battery pack ejection structure, wherein the action direction of the driving force for ejecting the battery pack is not on the same straight line as the first linear direction of the battery pack, but a special-shaped lever is used. The battery pack is ejected by transmission. Due to the existence of the lever arm, there is a height difference between the ejection structure and the locking mechanism for locking the battery pack, which makes the battery pack prone to roll and unstable installation. When the design is unreasonable, the ejection efficiency of the battery pack is low. For another example, the patent with the publication number CN100540190C shown in FIG. 2 discloses an ejection mechanism for a battery pack, wherein the ejection structure and the locking mechanism for locking the battery pack are basically located on the same plane, but the spring is directly connected to the casing The surface directly acts on the battery pack, which leads to inconvenience in the installation of the spring and the battery pack, and the problem of uneven thrust applied by the spring to the battery pack.

Utility model content

In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide an electric tool and its main unit, whose battery pack ejection structure is more concise and efficient, and the installation is more convenient.

In order to achieve the above-mentioned goals, the utility model adopts the following technical scheme:

A power tool, comprising: a motor for driving a working component for operation; a battery pack for supplying power to the motor; a housing, the battery pack being detachably connected to the housing; a locking mechanism for connecting the housing and the battery pack, The locking mechanism is mounted to the casing or the battery pack; the locking mechanism has a locked state in which the battery pack and the casing are locked to form a fixed connection and an unlocked state in which the battery pack is released so that it can slide relative to the casing in a first linear direction; The ejection mechanism is matched with the battery pack and applies a driving force along the first linear direction to the battery pack; the ejection mechanism includes: an action element, mated with the battery pack; a thrust assembly, connected to the housing and the action element; when the locking mechanism When in the unlocked state, the thrust assembly exerts a thrust along the first linear direction on the acting element, so that the acting element moves relative to the housing along the first linear direction.

Further, the casing is connected to or formed with a battery pack seat for installing the battery pack, and more than two sets of ejection mechanisms are provided on the battery pack seat.

Further, the two groups of ejection mechanisms are symmetrically arranged in a direction perpendicular to the first straight line.

Further, the battery pack includes a fitting portion that is matched with the action element; the action element is at least partially exposed to the casing; the action element is in surface contact with the battery pack.

Further, at least part of the acting element is disposed inside the casing, the battery pack includes a protruding portion protruding outward, and the casing is provided with a hole allowing the protruding portion to pass through.

Further, the battery pack seat is formed with a mounting surface for mounting the battery pack, the mounting surface is substantially parallel to the first straight line, the locking mechanism is mounted to the mounting surface; the ejection mechanism is mounted to the side end surface substantially perpendicular to the mounting surface; The institutions are basically located in the same plane.

Further, the locking mechanism includes a limiting portion, and the battery pack includes a receiving portion that cooperates with the limiting portion; the battery pack seat is formed with a mounting surface for installing the battery pack, the mounting surface is substantially parallel to the first straight line, and the limiting portion is mounted to On the mounting surface, the acting element is mounted on the side end surface substantially perpendicular to the mounting surface; the limiting part and the acting element are basically located in the same plane.

Further, the ejection mechanism further includes a base for installing the thrust assembly; the base is installed inside the casing or integrally formed with the casing; both the base and the acting element are provided with a mounting portion for installing the thrust assembly.

Further, the thrust assembly can be elastically deformed along the first linear direction; the mounting portion is a prism that is fixedly connected or integrally formed on the base or the acting element, and the thrust assembly is sleeved on the mounting portion.

Further, the ejecting mechanism further includes a blocking portion for limiting the thrust assembly in a direction perpendicular to the first straight line, and the blocking portion is connected to or integrally formed with the base or the housing.

Further, the outer contour of the acting element is in the shape of a rectangular parallelepiped, and the surface of the acting element is substantially fitted with the mounting surface.

A main unit of an electric tool, the main unit is used to install a battery pack, and the main unit includes: a motor, which is powered by the battery pack; a casing, the battery pack is detachably connected to the casing; a locking mechanism, used for connecting the casing and the battery pack, the locking mechanism Installed to the casing or the battery pack; the locking mechanism has a locked state that locks the battery pack and the casing to form a fixed connection and an unlocked state that releases the battery pack so that it can slide relative to the casing along the first linear direction; the ejection mechanism , mating with the battery pack and applying a driving force along the first linear direction to the battery pack; the ejection mechanism includes: an action element, which is mated with the battery pack; a thrust assembly, which connects the housing and the action element, and the thrust assembly can act on the The element generates a thrust along the first linear direction, and the acting element and the thrust component form a linkage along the first linear direction.

The advantages of the utility model are that the electric power tool and its main tool of the utility model optimize the ejection structure of the battery pack of the electric tool, so that the ejection structure is more concise and efficient, and the installation is more convenient.

Description of drawings

Fig. 1 is the structural representation of a prior art;

Fig. 2 is a structural cross-sectional view of another prior art;

Fig. 3 is the schematic diagram of the electric tool of the first embodiment of the present invention;

4 is a perspective view of a partial structure of the power tool in FIG. 3;

FIG. 5 is a perspective view of the battery pack of the power tool in FIG. 3;

FIG. 6 is a perspective view of the battery pack of FIG. 5 from another angle;

7 is a perspective view of a partial structure of the power tool in FIG. 3;

8 is a schematic diagram of the structure of the power tool in FIG. 3 for adapting to the battery pack, including an ejection mechanism and a locking mechanism;

FIG. 9 is a schematic diagram of the battery pack of the power tool according to the first embodiment of the present invention when it is installed on the housing;

Figure 10 is a plan view of a set of ejection mechanisms in Figure 8;

Figure 11 is an exploded view of the ejection mechanism in Figure 10;

Figure 12 is a cross-sectional view of a portion of the structure of the power tool in Figure 3, including an ejection mechanism;

13 is a schematic plan view of a partial structure of the power tool in FIG. 3;

Figure 14 is a top view of the partial structure of the power tool in Figure 3;

Figure 15 is a plan view of the motor, fan and transmission of the power tool in Figure 3;

Fig. 16 is a sectional view of a part of the structure of the motor and the transmission device of the power tool in Fig. 15;

17 is a schematic diagram of the main body of the power tool according to the second embodiment of the present invention.

Detailed ways

FIG. 1 shows a power tool 100 according to a first embodiment of the present invention. The power tool 100 of the present invention specifically takes a pruning machine as an example. Of course, the power tool 100 can also be other hand-held power tools such as chainsaws, hair dryers, lawn mowers, screwdrivers, sanders, etc. Other hand-push electric tools such as lawn mowers, hand-push snow blowers, etc., can also be riding-type electric tools such as riding lawn mowers, snow blowers, sprinklers, etc. The electric tools applicable to the limited technical solution all belong to the protection scope of the present invention.

As shown in FIGS. 3 to 6 , the power tool 100 includes a working assembly 11 , a main body 12 , and a battery pack 13 . The host 12 includes a motor 121, and the battery pack 13 supplies power to the motor 121 so that the motor 121 can drive the working assembly 11 to move to realize the function of the power tool 100. In this embodiment, the working assembly 11 is a blade assembly for cutting vegetation, specifically pruning Scissors; the host 12 also includes a housing 122, the housing 122 is formed around a housing space for accommodating the motor 121, and the battery pack 13 and the housing 122 are detachably connected.

The power tool 100 also includes a locking mechanism 14 and an eject mechanism 15 . The locking mechanism 14 is used to connect the casing 122 and the battery pack 13, and after the battery pack 13 is installed to the casing 122, the battery pack 13 is locked to the casing 122, and the locking mechanism 14 is installed to the casing 122 or the battery pack 13, this embodiment The middle locking mechanism 14 is mounted to the casing 122 ; the locking mechanism 14 has a locked state in which the battery pack 13 and the casing 122 are locked from relative movement and an unlocked state in which the battery pack 13 can slide relative to the casing 122 . When the battery pack 13 is installed on the casing 122, the ejection mechanism 15 is mated with the battery pack 13, and the ejection mechanism 15 applies a driving force along the first straight line 101 to the battery pack 13. Under the action of the driving force, the locking mechanism When 14 is in the unlocked state, the ejection mechanism 15 ejects the battery pack 13 relative to the housing 122 . Specifically, when the locking mechanism 14 is in the unlocked state, the ejecting mechanism 15 can eject the battery pack 13 relative to the casing 122 without external force, and the direction of the first straight line 101 is shown by the arrow in FIG. 4 . It should be noted that the ejection of the battery pack 13 relative to the casing 122 means that the battery pack 13 and the motor 13 are electrically disconnected, and the battery pack 13 is not necessarily completely separated from the casing 122 .

The casing 122 is connected to or formed with a battery pack holder 131 for installing the battery pack 13 ; in this embodiment, the battery pack holder 131 is formed by the casing 122 itself, that is, integrally formed with the casing 122 . The battery pack base 131 and the battery pack 13 form a detachable sliding connection; specifically, the battery pack base 131 is provided with a slide rail for the power supply battery pack 13 to slide, and the battery pack 13 is provided with a slide groove matched with the slide rail; as a In an alternative embodiment, the battery pack seat 131 is provided with a chute for the battery pack 13 to slide, and the battery pack 13 is provided with a slide rail matched with the chute.

Two or more sets of ejection mechanisms 15 are arranged on the battery pack holder 131 ; in this embodiment, two sets of ejection mechanisms 15 are symmetrically arranged on the battery pack holder 131 along the direction perpendicular to the direction of the first straight line 101 , so that the battery pack 13 is balanced. the driving force of action. In this embodiment, two sets of ejection mechanisms 15 are symmetrically arranged on the battery pack holder 131 along the direction perpendicular to the direction of the first straight line 101 of the battery pack 13 . Such a position design can make the installation of the battery pack 13 more stable without creating a width. deflection of direction. More specifically, the two sets of ejecting mechanisms 15 are respectively disposed at one end of the battery pack holder 131 in the length direction and an edge in the width direction of the battery pack holder 131 . Such a position design can make full use of the interaction between the battery pack 13 and the ejection mechanism 15 when the battery pack 13 is installed to the battery pack holder 131 , that is, the moment of the ejection mechanism 15 to the center of the battery pack 13 is made larger, so that the battery pack 13 is placed at the center of the battery pack 13 . The installation is more stable under the action of the pop-up structure. Of course, it can be understood that the ejecting mechanism 15 can also be disposed at other positions of the battery pack holder 131 , which is not limited herein.

As shown in FIGS. 4 to 8 , the ejection mechanism 15 includes an action element 151 and a second thrust assembly 152 . The acting element 151 is mounted on the housing 122 and is matched with the battery pack 13 ; the battery pack 13 includes a fitting portion 132 matched with the acting element 151 . The second thrust assembly 152 is connected to the housing 122 and the acting element 151. The second thrust assembly 152 is preferably an elastic piece and can be shortened or extended along the direction of the first straight line 101 of the battery pack 13; the acting element 151 is connected to the second thrust assembly 152 or an external force Under the action, the action element 151 can move relative to the housing 122 along the first straight line 101 direction. Line 101 moves in the direction. When the locking mechanism 14 is in the locked state, the battery pack 13 is fixed to the housing 122 under the action of the locking mechanism 14, at this time the second thrust assembly 152 is in a compressed state, and the acting element 151 exerts a force on the battery pack 13 along the first The thrust in the direction of the straight line 101; when the locking mechanism 14 is in the unlocked state, the locking mechanism 14 no longer exerts a force on the battery pack 13 to fix it to the housing 122, and at this time, the battery pack 13 is under the thrust of the second thrust assembly 152. The pack 13 is ejected relative to the battery pack holder 131 , and the second thrust assembly 152 exerts a thrust along the first linear direction 101 on the acting element 151 so that the acting element 151 moves relative to the housing 122 along the first linear direction 101 .

The action element 151 is at least partially exposed to the casing 122, and the matching portion 132 is a recessed portion of the battery pack 13 that is recessed inward. 13's pop-up effect. As an optional embodiment, at least part of the acting element 151 is disposed inside the casing 122, the battery pack 13 includes a protruding portion protruding outward, and the casing 122 is provided with a hole for allowing the protruding portion to pass through; When the 13 is installed on the housing 122, the protruding portion extends into the interior of the housing 122 to engage with the action element 151.

The action element 151 acts on the battery pack 13 instead of the second thrust component 152 directly acting on the battery pack, so that the thrust exerted by the second thrust component 152 on the battery pack 13 is more uniform, so that the installation and ejection of the battery pack 13 are more stable, and further , the action element 151 is in surface contact with the matching portion 132 . Specifically, the outer contour of the action element 151 is in the shape of a cuboid. More specifically, the action element 151 is a rectangular parallelepiped with one side hollowed out. The matching portion 132 includes a concave end surface. The other side of the action element 151 is in contact with the battery pack 13 . so that the battery pack 13 is forced to pop out.

The direction in which the thrust of the second thrust assembly 152 acts is consistent with the first linear direction 101 of the battery pack 13 , which makes the transmission process for the second thrust assembly 152 to drive the battery pack 13 to pop out more simple and efficient. The battery pack holder 131 further includes a plurality of pole pieces that are electrically connected to the motor 121 , and the battery pack 13 includes a plurality of connection terminals that are electrically connected to the pole pieces.

As shown in FIGS. 7 to 9 , since the battery pack 13 is actually subjected to the force of both the locking mechanism 14 and the ejecting mechanism 15 when it is installed on the battery pack holder 131 , when the locking mechanism 14 and the ejecting mechanism 15 are not on the same plane, the That is, when there is a certain height difference, the battery pack 13 is prone to roll, resulting in unstable installation. Therefore, in the present invention, the locking mechanism 14 and the ejecting mechanism 15 are basically arranged on the same plane, and the specific implementation structure is as follows: the battery pack holder 131 is formed with a mounting surface 131a for mounting the battery pack 13, and the mounting surface 131a is substantially parallel to the first Line 101, the locking mechanism 14 is mounted to the mounting surface 131a, and the eject mechanism 15 is mounted to the side end surface perpendicular to the mounting surface 131a and close to the mounting surface 131a.

Specifically, in this embodiment, the locking mechanism 14 includes a limiting portion 141 , and the battery pack 13 includes a receiving portion 133 that cooperates with the limiting portion 141 ; the battery pack holder 131 is formed with a mounting surface 131 a for mounting the battery pack 13 . The surface 131a is substantially parallel to the first straight line 101, the limiting portion 141 is mounted to the mounting surface 131a, and the action element 151 is mounted to the side end face perpendicular to the mounting surface 131a and is close to the mounting surface 131a; the limiting portion 141 and the action element 151 are basically located at In the same plane, the surface of the acting element 151 is substantially abutted with the mounting surface 131a. It can be understood that, since the actual mating with the battery pack 13 is the limit portion 141 of the locking mechanism 14 and the action element 151 of the eject mechanism 15, therefore, if the limit portion 141 and the action element 151 are basically located in the same plane, the battery Bag 13 is also basically free from roll. As an optional embodiment, a limiting portion 141 is provided on the battery pack 13 , and the locking mechanism 14 includes a receiving portion 133 that cooperates with the limiting portion 141 . More specifically, the limiting portion 141 is a buckle, and the receiving portion 133 is a slot matched with the buckle. Of course, the structures of the limiting portion 141 and the receiving portion 133 may also be other structures, such as two magnets with opposite magnetic properties, which are not limited herein.

The locking mechanism 14 further includes an operating portion 142 for the user to operate to lock or unlock the battery pack 13 , and the operating portion 142 is connected with the limiting portion 141 or formed integrally. In this embodiment, the limiting portion 141 and the operating portion 142 are integrally formed with a rotating shaft 143 installed therebetween, so that the operating portion 142 and the limiting portion 141 can rotate around the rotating shaft 143 . The locking mechanism 14 further includes a first thrust assembly 144 mounted to the limiting portion 141 or the operating portion 142 so as to keep the limiting portion 141 in a locked position capable of locking the battery pack 13 when no external force acts. The first thrust component 144 is preferably an elastic component capable of elastic deformation and includes a magnet and a magnetic component. In this embodiment, the first thrust component 144 is preferably a spring.

As shown in FIGS. 10 to 12 , the ejection mechanism 15 further includes a base 153 for installing the second thrust assembly 152 . The base 153 is detachably connected to the casing 122 ; the base 153 is installed inside the casing 122 ; the base 153 and the action element 151 is provided with a mounting portion 154 for mounting the second thrust assembly 152 . Specifically, the bottom surface 153 a of the base 153 abuts against the inner surface of the housing 122 under the action of the second thrust assembly 152 , and the mounting portion 154 is provided on the action element 151 and the outer surface of the base 153. The installation sequence of the ejection mechanism 15 is as follows: after the ejection mechanism 15 is assembled, the ejection mechanism 15 is assembled to the housing 122 as a whole. The base 153 is installed on the other end of the second thrust assembly 152, and then the action element 151 of the ejection mechanism 15 is passed through the housing 122 from the rear end of the housing 122 through the hole opened in the housing 122 and abuts against the housing 122. The base 153 applies a pressure to compress the second thrust assembly 152 while pushing the base 153 into the housing 122 . As an optional embodiment, the base 153 and the casing 122 are integrally formed, and the mounting portion 154 is disposed on the inner end face of the acting element 151 and the outer face of the casing 122. The installation sequence of the ejecting mechanism 15 is as follows: One end of the component 152 is mounted on the mounting portion 154 of the housing 122 , and the acting element 151 is mounted on the other end of the second thrust component 152 .

Preferably, the mounting portion 154 guides the direction of elastic deformation of the second thrust assembly 152 , the mounting portion 154 is a prism fixedly connected or integrally formed with the base 153 and the action element 151 , and the extending direction of the prism is parallel to the first straight line 101 . The second thrust component 152 is specifically a spring, and the second thrust component 152 is sleeved on the surface of the mounting portion 154 . The second thrust component 152 is preferably an elastic component capable of elastic deformation and includes a magnet and a magnetic component. In this embodiment, the second thrust component 152 is preferably a spring.

The ejecting mechanism 15 further includes a blocking portion 155 for limiting the position of the second thrust assembly 152 perpendicular to the first linear direction 101 . The blocking portion 155 is connected to or integrally formed with the base 153 or the housing 122 . Specifically, the blocking portion 155 includes a blocking surface 155a extending along the length direction of the second thrust assembly 152 to prevent the second thrust assembly 152 from being offset or skewed; in addition, the blocking portion 155 is connected with a reinforcement perpendicular to the blocking surface 155a The ribs 156 and the reinforcing ribs 156 are also perpendicular to the base 153 . The bases 153 of the two groups of ejection mechanisms 15 disposed opposite to each other in the direction perpendicular to the first linear direction 101 contact or collide with each other, so as to further limit the position of the ejection mechanisms 15 in the direction perpendicular to the first linear direction 101 to avoid its Installation is unstable.

As shown in FIG. 13 to FIG. 16 , the power tool 100 (as shown in FIG. 3 ) further includes a transmission device 123 , and the transmission device 123 is arranged between the motor 121 and the working assembly 11 to realize the power between the motor 121 and the working assembly 11 . transfer. The motor 121 includes a rotor shaft 121a, a rotor sleeve 121b and a stator iron core 121c, wherein the rotor shaft 121a rotates around the first axis 101a; the rotor sleeve 121b is connected with the rotor shaft 121a; the stator iron core 121c is arranged in the rotor sleeve 121b . Preferably, the motor 121 is an outer rotor motor 121, and the rotor shaft 121a is disposed inside the rotor sleeve 121b. The transmission device 123 includes a deceleration assembly and a casing 123a, the deceleration assembly receives the power output by the motor 121; the casing 123a accommodates the deceleration assembly; wherein, the casing 123a is arranged in the casing 122; the rotor shaft 121a extends into the casing 123a; The orthographic projection of the rotor sleeve 121b in a plane perpendicular to the first axis 101a lies in the orthographic projection of the casing 123a in this plane. In other words, the orthographic projection of the motor 121 in the plane perpendicular to the first axis 101a is located in the orthographic projection of the box 123a in the plane. That is to say, the motor 121 in the present invention has a smaller size than the transmission device 123 in the direction perpendicular to the first axis 101a, thereby making the power tool 100 smaller in size and lighter in weight. As an alternative embodiment, the rotor shaft 121a may not extend into the casing 123a, and the deceleration assembly includes a connecting shaft extending into the casing 123a and connecting with the rotor shaft 121a. The axis of the rotor shaft 121a is connected to the connecting shaft. The axes are coincident or parallel.

The motor 121 is in a direction parallel to the first axis 101a, and the motor 121 is arranged above the battery pack 13 and the working assembly 11, which makes the weight distribution of the whole machine more uniform when the user is cutting longitudinally, so as to prevent the power tool 100 from generating a large amount of damage. askew. The power tool 100 includes a main handle 124a and an auxiliary handle 124b for the user to hold. The main handle 124a and the auxiliary handle 124b are mounted to or surrounded by the housing 122, the main handle 124a extends in the front-rear direction, and the auxiliary handle 124b is at least partially Extends in the left-right direction perpendicular to the front-rear and up-down directions. In the front-rear direction, the primary handle 124a is closer to the battery pack 13 than the secondary handle 124b, and the secondary handle 124b is closer to the working assembly 11 than the primary handle 124a. In the front-rear direction, the motor 121 and the battery pack 13 are arranged on one side of the auxiliary handle 124b, and the working assembly 11 is arranged on the other side of the auxiliary handle 124b, which makes the weight distribution of the user in the front-rear direction more uniform when holding the power tool 100. Specifically, along the front-rear direction, the motor 121 is arranged between the battery pack 13 and the auxiliary handle 124b, and the motor 121 is arranged between the main handle 124a and the auxiliary handle 124b.

As shown in FIG. 4 and FIG. 14 , in the present invention, the casing 122 has a mid-section plane A, and the casing 122 is substantially symmetrical about the mid-section plane A along the left-right direction, that is, the casing 122 is formed by the left casing 122 a and the right casing 122b are assembled in two parts. The motor 121 is basically symmetrical about the mid-section plane A; in fact, the entire power tool 100 is basically symmetrical about the mid-section plane A, which makes the distribution of the center of gravity of the power tool 100 (as shown in FIG. 3 ) more reasonable and more ergonomic Design requirements.

As shown in FIGS. 15 and 16 , the ratio of the diameter D of the rotor sleeve 121b to the stack length L of the stator core 121c is greater than or equal to 1.5 and less than or equal to 3; further, the diameter D of the rotor sleeve 121b and the stator core 121c are The ratio of the stack length L is greater than or equal to 1.7 and less than or equal to 2.5; preferably, the ratio of the diameter D of the rotor sleeve 121b to the stack length L of the stator core 121c is about 2.3 or 1.75, and the diameter D of the rotor sleeve 121b is less than or equal to 35 mm, and the stack length L of the stator core 121c is preferably 15 mm or 20 mm.

The casing 123a includes a surrounding portion 123b for surrounding at least part of the speed reduction assembly and a top cover 123c; the top cover 123c is connected to the upper side of the surrounding portion 123b; the top cover 123c supports the motor 121 . Specifically, the surrounding portion 123b is formed with a circumferentially sealed accommodating space along the first axis 101a, and at least part of the deceleration assembly is disposed inside the accommodating space. The top cover 123c covers the accommodating space formed by the surrounding portion 123b from above in the direction of the first axis 101a.

The transmission mode of the deceleration assembly is preferably planetary gear transmission or spur gear transmission. In this embodiment, a two-stage planetary gear transmission system is adopted. The deceleration assembly specifically includes a sun gear 123d, an inner gear 123e and a planetary gear 123f; the sun gear 123d and the motor shaft Connection, in this embodiment, the sun gear 123d is connected to the rotor shaft 121a. The ring gear 123e surrounds the sun gear 123d; the planet gears 123f mesh with the ring gear 123e and the sun gear 123d, respectively. The difference between the diameter D of the rotor sleeve 121b and the outer diameter D1 of the inner gear ring 123e is greater than or equal to 0 and less than or equal to 6 mm. Further, the difference between the diameter D of the rotor sleeve 121b and the outer diameter D1 of the inner gear ring 123e The difference is greater than or equal to 1 and less than or equal to 4 mm. In this embodiment, the difference between the diameter D of the rotor sleeve 121b and the outer diameter D1 of the inner gear 123e is about 2 mm. It should be noted that the two-stage planetary gear transmission The outer diameters of the ring gears 123e of the system are substantially equal. The deceleration assembly includes an output shaft 123g for outputting power; the ratio of the rotational speed of the rotor shaft 121a to the rotational speed of the output shaft 123g is the deceleration ratio R of the deceleration assembly; the ratio of the diameter D of the rotor sleeve 121b to the deceleration ratio R is greater than or equal to 2.3 mm and less than or equal to 3 mm, further, the ratio of the diameter D of the rotor sleeve 121b to the reduction ratio R is greater than or equal to 2.5 mm and less than or equal to 2.8 mm. Preferably, the two-stage planetary gear transmission system includes a high-speed stage transmission and a low-speed stage transmission, the total transmission ratio R of the two-stage planetary gear transmission system is about 12.053, the high-speed stage transmission ratio is about 3.375, and the low-speed stage transmission ratio is about 3.571. As another optional embodiment, the total transmission ratio R of the two-stage planetary gear transmission system is about 13.3, wherein the transmission ratio of the high-speed stage is about 3.714, and the transmission ratio of the low-speed stage is about 3.571.

The weight of the motor 121 is greater than or equal to 100 g and less than or equal to 155 g, and further, the weight of the motor 121 is greater than or equal to 120 g and less than or equal to 150 g. The ratio of the maximum output power P of the motor 121 to the diameter D of the rotor sleeve 121b is greater than or equal to 10 watts per millimeter and less than or equal to 13 watts per millimeter. In the present invention, the diameter of the rotor sleeve 121b of the motor 121 is small and the maximum output power of the motor 121 is large enough, so that the power tool 100 has a small volume and a light weight when meeting the working performance requirements.

The power tool further includes a fan 124, which is mounted on the rotor shaft 121a; in this embodiment, the fan 124 is mounted on one end of the motor 121 and basically covers the end face of the motor 121, so that the motor 121 can be sufficiently dissipated. The diameter of the fan 124 is greater than or equal to 30 mm and less than or equal to 40 mm. Further, the diameter of the fan 124 is greater than or equal to 33 mm and less than or equal to 38 mm. Preferably, the diameter of the fan 124 is approximately equal to the diameter D of the rotor sleeve 121b. As an alternative embodiment, the fan 124 is indirectly mounted to the rotor shaft 121a. As another alternative embodiment, the fan 124 is mounted to the non-rotor shaft 121a part of the motor 121, for example, sleeved on the surface of the rotor sleeve 121b.

The second embodiment of the present invention is a main body 200 of a power tool. As shown in FIG. 17 , compared with the power tool 100 (see FIG. 3 ) of the first embodiment of the present invention, the main body 200 of the power tool lacks working components , the battery pack and the operation baffle, other structures are the same, and of course also include the same locking mechanism 24 and ejecting mechanism 25 as the power tool 100 in the first embodiment, which will not be repeated here.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the above-mentioned embodiments do not limit the present invention in any form, and all technical solutions obtained by means of equivalent replacement or equivalent transformation all fall within the protection scope of the present invention.

Claims (11)

1. A power tool, comprising:

a motor driving a working assembly for work;

the battery pack is used for supplying power to the motor;

a housing to which the battery pack is detachably connected;

a locking mechanism for connecting the housing and the battery pack, the locking mechanism being mounted to the housing or the battery pack; the locking mechanism has a locking state for locking the battery pack and the shell to form a fixed connection, and an unlocking state for releasing the battery pack to enable the battery pack to slide along a first linear direction relative to the shell;

the ejecting mechanism is matched and connected with the battery pack and applies a driving force along the first linear direction to the battery pack;

the method is characterized in that:

the ejection mechanism includes:

an active element coupled with the battery pack;

a thrust assembly connecting the housing and the reaction element; when the locking mechanism is in the unlocked state, the thrust assembly applies a thrust force in the first linear direction to the acting element such that the acting element moves in the first linear direction relative to the housing.

2. The power tool of claim 1, wherein:

the shell is connected with or formed with a battery pack seat for installing a battery pack, and the battery pack seat is provided with more than two groups of ejection mechanisms.

3. The power tool of claim 2, wherein:

the two groups of ejection mechanisms are symmetrically arranged in the direction perpendicular to the first straight line.

4. The power tool of claim 1, wherein:

the battery pack includes a mating portion that mates with the active element; the acting element is at least partially exposed out of the shell; the active element is in surface contact with the battery pack.

5. The power tool of claim 1, wherein:

at least part of the acting element is arranged in the shell, the battery pack comprises a protruding part protruding outwards, and the shell is provided with a hole allowing the protruding part to pass through.

6. The power tool of claim 2, wherein:

the battery pack holder is formed with a mounting surface for mounting the battery pack, the mounting surface being substantially parallel to the first straight line, the locking mechanism being mounted to the mounting surface; the ejection mechanism is mounted to a side end surface substantially perpendicular to the mounting surface; the locking mechanism and the ejection mechanism are substantially in the same plane.

7. The power tool of claim 2, wherein:

the locking mechanism comprises a limiting part, and the battery pack comprises a receiving part matched with the limiting part;

the battery pack holder is formed with a mounting surface for mounting the battery pack, the mounting surface being substantially parallel to the first straight line, the stopper portion being mounted to the mounting surface, the acting member being mounted to a side end surface substantially perpendicular to the mounting surface; the limiting part and the acting element are basically located in the same plane.

8. The power tool of claim 1, wherein:

the ejection mechanism further comprises a base for mounting the thrust assembly; the base is mounted to the inside of the housing or integrally formed with the housing; the base with all be provided with the installation department that is used for installing thrust unit on the effect component.

9. The power tool of claim 8, wherein:

the thrust assembly can elastically deform along a first linear direction; the installation department be fixed connection or integrated into one piece in the base or the prism of effect component, thrust subassembly suit extremely the installation department.

10. The power tool of claim 8, wherein:

the pop-up mechanism further comprises a blocking part which limits the thrust assembly in the direction perpendicular to the first straight line, and the blocking part is connected with or integrally formed on the base or the shell.

11. A main unit of a power tool for mounting a battery pack, the main unit comprising:

a motor powered by the battery pack;

a housing to which the battery pack is detachably connected;

a locking mechanism for connecting the housing and the battery pack, the locking mechanism being mounted to the housing or the battery pack; the locking mechanism has a locking state for locking the battery pack and the shell to form a fixed connection, and an unlocking state for releasing the battery pack to enable the battery pack to slide along a first linear direction relative to the shell;

the ejecting mechanism is matched and connected with the battery pack and applies a driving force along the first linear direction to the battery pack;

the method is characterized in that:

the ejection mechanism includes:

an active element coupled with the battery pack;

a thrust assembly connecting the housing and the reaction element; when the locking mechanism is in the unlocked state, the thrust assembly applies a thrust force in the first linear direction to the acting element such that the acting element moves in the first linear direction relative to the housing.

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