power tools

Abstract

An electric tool comprises: a body, comprising a longitudinally extending shell and a mounting portion provided at the end of the shell, wherein a tool terminal is provided on the mounting portion; a battery pack, comprising a connecting portion and battery terminals provided thereon, wherein when the battery pack is operated to be inserted into the mounting portion along a predetermined direction, the battery terminals are electrically connected to the tool terminals, and the battery terminals are arranged transversely on the battery pack shell perpendicular to the predetermined direction; a guide portion, formed on the mounting portion and the connecting portion, wherein the guide portion guides the battery pack to be installed on the mounting portion; the guide portion comprises a main guide unit and a secondary guide unit extending along the predetermined directions respectively, and the main guide unit and the secondary guide unit are longitudinally arranged between the connecting portion and the mounting portion; the main guide unit and the secondary guide unit are both rigidly matched; the main guide unit and the secondary guide unit are both rigidly matched; wherein the main guide unit comprises a transversely matched main matching surface, the secondary guide unit comprises a transversely matched secondary matching surface, and the ratio of the transverse gap between the main matching surfaces to the transverse gap between the secondary matching surfaces is greater than or equal to 0.3.

Description

Technical Field

[0001] The present invention relates to the technical field of electric tools, and in particular to an electric tool. Background Art

[0002] DC power tools are usually equipped with a battery pack to provide power for them. The battery pack is plugged in and out of the body. Since the power tool will vibrate during use, the battery pack and the main body will inevitably produce relative movement, which is accompanied by vibration noise. At the same time, the vibration of the machine will affect the user's feel. Since the battery pack and the main body are mostly in conductive contact, the mutual friction between the main body conductive terminals and the battery pack conductive terminals during vibration will cause the terminals to wear, thereby causing poor contact or conductive failure.

[0003] There is usually a fitting gap between the battery pack and the body. If the fitting gap is too large, it will affect the reliability of the fitting between the two and is not conducive to the shock absorption of the battery pack. If the fitting gap is too small, it will increase the difficulty of assembling and disassembling the battery pack. Therefore, in the prior art, elastic washers of various structural forms are usually added to the fitting between the battery pack and the body as shock-absorbing units to make up for the fitting gap between the two or reduce the vibration of the battery pack. However, the above-mentioned shock-absorbing units usually need to be set separately and then assembled with the shell, which increases the assembly process flow. In addition, the elastic pad wears out quickly during long-term use. Once the elastic pad is worn, the shock absorption and fitting effects will be greatly reduced. Therefore, how to effectively and conveniently achieve shock absorption of power tools is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] In order to address the deficiencies of the prior art, an object of the present invention is to provide an electric tool with improved shock absorption effect and reliability.

[0005] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0006] An electric tool comprising:

[0007] The body comprises a longitudinally extending shell and a mounting portion provided at an end of the shell, wherein the mounting portion is provided with a tool terminal;

[0008] A battery pack comprising a connecting portion and battery terminals provided thereon, wherein when the battery pack is inserted into the mounting portion in a predetermined direction, the battery terminals are electrically connected to the tool terminals, and the battery terminals are arranged transversely on the battery pack housing in a direction perpendicular to the predetermined direction;

[0009] a guide portion formed on the mounting portion and the connecting portion, the guide portion guiding the battery pack to be mounted on the mounting portion;

[0010] The guide portion includes a main guide unit and a secondary guide unit respectively extending along the predetermined direction, wherein the main guide unit and the secondary guide unit are longitudinally arranged between the connecting portion and the mounting portion;

[0011] The main guide unit and the auxiliary guide unit are both rigidly matched; wherein the main guide unit includes a main matching surface for transverse matching, the auxiliary guide unit includes an auxiliary matching surface for transverse matching, and the ratio of the transverse gap between the main matching surfaces to the transverse gap between the auxiliary matching surfaces is greater than or equal to 0.3.

[0012] Furthermore, the ratio of the transverse gap between the primary mating surfaces to the transverse gap between the secondary mating surfaces is greater than or equal to 0.5.

[0013] Furthermore, the main guide unit and the auxiliary guide unit are made of the same material.

[0014] Furthermore, the ratio of the weight of the battery pack to the lateral fitting clearance is greater than or equal to 0.3 kg / mm ​​and less than or equal to 30 kg / mm.

[0015] Furthermore, the ratio of the insertion and removal stroke of the battery pack along the predetermined direction to the lateral fitting clearance is greater than or equal to 40 and less than or equal to 700.

[0016] Furthermore, the main mating surface and the auxiliary mating surface on the mounting portion are arranged in dysplanes; the main mating surface and the auxiliary mating surface on the connecting portion are arranged in dysplanes.

[0017] Furthermore, the main guide unit includes a fuselage male guide rail provided on the mounting portion and a battery female guide rail provided on the connecting portion;

[0018] The auxiliary guide unit includes a fuselage female guide rail provided on the mounting portion and a battery male guide rail provided on the connecting portion.

[0019] Furthermore, the fuselage female guide rail includes a groove and a plurality of ribs arranged at intervals on the bottom wall of the groove, and the ribs extend in the longitudinal direction;

[0020] The electric tool further includes an elastic member disposed between the main mating surfaces, and the elastic member limits the displacement of the battery pack in a direction intersecting the predetermined direction.

[0021] An electric tool comprising:

[0022] The body comprises a longitudinally extending shell and a mounting portion provided at an end of the shell, wherein the mounting portion is provided with a tool terminal;

[0023] A battery pack comprising a connecting portion and battery terminals provided thereon, wherein when the battery pack is inserted into the mounting portion in a predetermined direction, the battery terminals are electrically connected to the tool terminals, and the battery terminals are arranged transversely on the battery pack housing in a direction perpendicular to the predetermined direction;

[0024] a guide portion formed on the mounting portion and the connecting portion, the guide portion guiding the battery pack to be mounted on the mounting portion;

[0025] The guide portion includes a main guide unit and a secondary guide unit respectively extending along the predetermined direction, wherein the main guide unit and the secondary guide unit are longitudinally arranged between the connecting portion and the mounting portion;

[0026] The main guide unit and the auxiliary guide unit are both rigidly matched; wherein the main guide unit includes a main matching surface for transverse matching, and the auxiliary guide unit includes an auxiliary matching surface for transverse matching, and the transverse gap between the main matching surfaces and the transverse gap between the auxiliary matching surfaces are both greater than or equal to 0 and less than or equal to 1 mm.

[0027] Furthermore, the ratio of the transverse gap between the primary mating surfaces to the transverse gap between the secondary mating surfaces is greater than or equal to 0.5.

[0028] Furthermore, the ratio of the weight of the battery pack to the lateral fitting clearance is greater than or equal to 0.3 kg / mm ​​and less than or equal to 30 kg / mm.

[0029] Furthermore, the ratio of the insertion and removal stroke of the battery pack along the predetermined direction to the lateral fitting clearance is greater than or equal to 40 and less than or equal to 700.

[0030] The electric tool of the present invention is provided with a main guide unit and a sub-guide unit between the body and the battery pack. The mating surface gap between the main guide unit and the sub-guide unit is reasonably set according to the specifications and insertion and removal stroke of the battery pack. In this way, on the basis of ensuring the assembly reliability and convenience of the battery pack and the body, the vibration of the battery pack during use is effectively reduced, and the vibration noise is reduced, so that the user has a better experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the DC angle grinder of the present invention;

[0032] Figure 2 yes Figure 1 Schematic diagram of the relationship between the battery pack and the body shown in;

[0033] Figure 3 yes Figure 1 The cross-sectional view shown in DD;

[0034] Figure 4 yes Figure 3 The partial enlarged schematic diagram shown in part E;

[0035] Figure 5 yes Figure 4 The partially enlarged schematic diagram shown in part F;

[0036] Figure 6 It is a structural schematic diagram of the fuselage mounting portion of the present invention;

[0037] Figure 7 is a schematic structural diagram of the fuselage mounting portion of the present invention from another angle;

[0038] Figure 8 1 is a schematic structural diagram of the battery pack of the present invention;

[0039] Figure 9 It is a structural schematic diagram of the battery pack of the present invention from another angle.

[0040] Reference numerals:

[0041] 100-Power Tools; 110-Execution Systems;

[0042] 200-body; 210-housing; 220-mounting portion; 230-tool terminal;

[0043] 300-battery pack; 310-connection part; 320-battery terminal;

[0044] 400 - main guide unit; 410 - fuselage male guide rail; 411 - first protrusion; 420 - battery female guide rail; 421 - first groove; 430 - main mating surface; 431 - fuselage main mating surface; 432 - battery main mating surface;

[0045] 500 - auxiliary guide unit; 510 - fuselage female guide rail; 511 - second groove; 512 - rib plate; 520 - battery male guide rail; 521 - second protrusion; 530 - auxiliary mating surface; 531 - fuselage auxiliary mating surface; 532 - battery auxiliary mating surface;

[0046] 600-Elastic parts. DETAILED DESCRIPTION

[0047] The present invention will be described in detail below with reference to the accompanying drawings.

[0048] like Figure 1 FIG. 1 shows a power tool 100 according to the present invention, wherein the power tool 100 according to the present invention is specifically a handheld power tool, which includes a body 200 and a battery pack 300 detachably coupled to the body 200. This embodiment is described using a DC angle grinder driven by a battery pack as an example.

[0049] At the same time, although this embodiment relates to a handheld power tool, it should be understood that the present invention is not limited to the disclosed embodiment, but can be applied to other types of power tools, including but not limited to electric drills, screwdrivers, sanders, etc.

[0050] like Figure 1 As shown, the power tool 100 of this embodiment primarily comprises an actuator system 110, as well as a power system, a transmission system, a fan assembly, and a control system, all housed within a body 200. The power system includes a motor, which drives the fan assembly and provides power to the actuator system. The transmission system, which may be a gear transmission, transfers power between the power system and the actuator system. The actuator system includes a working accessory, which in this embodiment is a grinding disc. The control system includes electronic components such as a circuit board and a switch assembly, and controls the operation of the actuator system based on the operation of the switch.

[0051] Among them Figure 2 As shown, the fuselage 200 includes a longitudinally extending shell 210, the execution system is arranged at the longitudinal top end of the shell 210, and the longitudinal end of the shell 210 is provided with a mounting portion 220, which is specifically a foot portion connecting the shell 210 and the battery pack. At the same time, the battery pack 300 also includes a connecting portion 310 connected to the mounting portion 220.

[0052] The electric tool of this embodiment further comprises a connection terminal for conductively connecting the battery pack and the body, the connection terminal including the following Figure 6 The tool terminal 230 shown and Figure 8 The battery terminal 320 shown in the figure, wherein a tool terminal 230 is provided on the mounting portion 220, and the tool terminal 230 is conductively connected to the control unit, and the battery terminal 320 is provided on the connecting portion 310. When the battery pack 300 is operated to be inserted into the mounting portion 220 along a predetermined direction, the battery terminal 320 is conductively connected to the tool terminal 230, wherein the tool terminal 230 is arranged on the mounting portion 220 in a horizontal direction perpendicular to the predetermined direction, and similarly, the battery terminal 320 is arranged in a horizontal direction on the battery pack shell.

[0053] The predetermined direction refers to the direction of battery pack insertion and removal, refer to Figure 2 Direction shown in A; the horizontal direction is roughly perpendicular to the plug-in direction, refer to Figure 2 The direction indicated by B in the figure is: the longitudinal direction refers to the direction of the fuselage, which is roughly perpendicular to the predetermined direction and the horizontal direction. Figure 2 Direction shown by C.

[0054] In this embodiment, the battery pack 300 is plugged into and out of the body along direction A in the figure. Of course, the battery pack 300 can also be plugged into and out of the body along direction B in the figure.

[0055] In this embodiment, a guide portion is further provided on the mounting portion 220 and the connecting portion 310. The guide portion is used to guide the battery pack 300 to be installed on the mounting portion 220. The guide portion includes a main guide unit 400 and a secondary guide unit 500 extending in predetermined directions, wherein the main guide unit 400 and the secondary guide unit 500 are longitudinally arranged between the connecting portion 310 and the mounting portion 220. Figure 3-Figure 4 As shown, the main guide unit 400 and the auxiliary guide unit 500 are arranged side by side between the connecting portion 310 and the mounting portion 220 in the up-down direction, and both the main guide unit 400 and the auxiliary guide unit 500 extend in a predetermined direction.

[0056] The main guide unit 400 and the auxiliary guide unit 500 are made of the same material, and are rigidly matched with each other. The matching clearance between the main guide units 400 is greater than or equal to zero, and the matching clearance between the auxiliary guide units 500 is also greater than or equal to zero.

[0057] like Figure 3 and Figure 4 As shown, in this embodiment, the main mating surface and the auxiliary mating surface on the mounting portion 220 are arranged in different planes; the main mating surface and the auxiliary mating surface on the connecting portion 310 are also arranged in different planes, where the different planes are not in the same plane, and they can be two intersecting planes or two planes that are parallel to each other.

[0058] In this embodiment, the main guide unit 400 and the auxiliary guide unit 500 are both guide structures directly molded on the battery pack 300 shell and the body shell 210, that is, the material of the main guide unit 400 and the auxiliary guide unit 500 is the same as the shell material, specifically plastic material.

[0059] This embodiment directly forms a guide unit with a clearance fit on the shell of the fuselage extension leg and the battery pack shell, without the aid of other shock-absorbing structures such as springs or elastic pads. This allows the guide unit to guide the battery pack during insertion and removal, while also improving the shock-absorbing performance of the battery pack during use, reducing the wear of the battery pack terminals and the fuselage terminals caused by the vibration of the battery pack relative to the fuselage, and also reducing noise, thereby improving the user experience.

[0060] like Figure 4-7 As shown, the main guide unit 400 includes a pair of transversely mating main mating surfaces 430. The main mating surfaces 430 include a main mating surface 431 of the body located on the mounting portion 220 and a main mating surface 432 of the battery pack located on the battery pack connection portion 310. The main mating surface 431 of the body and the main mating surface 432 of the battery pack 310 mate transversely during insertion, removal, and use. Transverse mating refers to mutual restraint and restriction in the transverse direction.

[0061] like Figure 5As shown, the secondary guide unit 500 includes a pair of secondary mating surfaces 530 that are laterally mated. The secondary mating surfaces 530 include a body secondary mating surface 531 located on the mounting portion 220 and a battery secondary mating surface 532 located on the battery pack connecting portion 310, wherein the body secondary mating surface 531 and the battery secondary mating surface 532 are laterally mated during insertion, removal and use.

[0062] The main mating surface 431 of the body and the main mating surface 432 of the battery can be clearance-fitted or contact-fitted, and similarly, the auxiliary mating surface 531 of the body and the auxiliary mating surface 532 of the battery can also be clearance-fitted or contact-fitted.

[0063] Among them Figure 4 As shown, in this embodiment, a pair of main guide units 400 are provided, which are symmetrically arranged on both sides of the connecting terminal in the transverse direction, and a pair of auxiliary guide units 500 are also provided, which are also symmetrically arranged on both sides of the connecting terminal in the transverse direction.

[0064] See attached Figure 4 , wherein the main guide unit 400 in this embodiment includes a fuselage male guide rail 410 provided on the mounting portion 220 and a battery female guide rail 420 provided on the connecting portion 310; the auxiliary guide unit 500 includes a fuselage female guide rail 510 provided on the mounting portion 220 and a battery male guide rail 520 provided on the connecting portion 310.

[0065] like Figure 5 As shown, the main guide unit 400 includes a pair of body male guide rails 410 arranged opposite to each other on the inner wall of the shell of the body extension foot, wherein the pair of body male guide rails 410 are respectively arranged on the shell on the lateral sides of the tool terminal 230, and the body male guide rails 410 are a pair of strip-shaped first protrusions 411 protruding from the inner wall of the shell. Correspondingly, in order to accommodate the body male guide rails 410, the battery female guide rails 420 include a pair of battery female guide rails 420 arranged on the battery pack shell with their backs facing each other, wherein the battery female guide rails 420 are specifically strip-shaped first grooves 421, wherein the pair of first grooves 421 are respectively arranged at the lateral ends of the battery terminal 320.

[0066] Therefore, in this embodiment, as shown in FIG4- Figure 5 As shown, the lateral outer surface of the first protrusion 411 constitutes the main mating surface 431 of the fuselage, and the bottom surface of the first groove 421 constitutes the main mating surface 432 of the battery, and the gap between the two constitutes the lateral mating gap H of the main guide unit 400.

[0067] See also Figure 6-Figure 9 The auxiliary guide unit 500 of this embodiment includes a pair of battery male guide rails 520 disposed on the battery pack housing facing away from each other. Figure 9, wherein a pair of battery male guide rails 520 include second protrusions 521 respectively arranged on the upper side of the first groove 421. Correspondingly, in order to accommodate the battery male guide rails 520, a pair of body female guide rails 510 arranged opposite to each other are provided on the inner wall of the foot housing, wherein Figure 7 As shown, the fuselage female guide rail 510 in this embodiment includes a pair of second grooves 511 disposed at the upper ends of the first protrusions 411, and a plurality of spaced ribs 512 disposed on the bottom walls of the second grooves 511. The ribs 512 extend longitudinally and are spaced apart on the bottom wall of the second grooves 511. As shown in FIG4 , the lateral outer surfaces of the ribs 512 constitute the fuselage secondary mating surface 531, and the lateral outer surface of the second protrusion 521 constitutes the battery secondary mating surface 532; the lateral gap between the two constitutes the lateral mating gap h of the secondary guide unit 500.

[0068] Of course, as an alternative embodiment, the bottom wall of the fuselage female guide rail 510 can also be set as a whole surface structure instead of a rib structure; similarly, the first protrusion 411 of the fuselage male guide rail 410 can also be set to include a number of vertically extending ribs instead of a whole surface structure, and there is no limitation on this.

[0069] Of course, as an alternative embodiment, the rib 512 may not be provided in the second groove 511 , and the bottom wall of the second groove 511 cooperates with the lateral outer surface of the second protrusion 521 to form a secondary mating surface 530 .

[0070] like Figure 5 As shown, if the lateral gap between the main mating surface 431 of the body and the main mating surface 432 of the battery is H, the lateral gap between the secondary mating surface 531 of the body and the secondary mating surface 532 of the battery is h; where H and h are both greater than or equal to 0 and less than or equal to 1 mm. In this embodiment, the lateral gap H between the main mating surfaces is set to 0.1 mm ≤ H ≤ 1 mm, where H can be set to 0.1 mm, 0.2 mm, 0.5 mm, 1 mm, etc.; the lateral gap h between the secondary mating surfaces is set to 0.1 mm ≤ H ≤ 1 mm, where h can also be set to 0.1 mm, 0.2 mm, 0.5 mm, 1 mm, etc.

[0071] The ratio of the lateral gap H between the main mating surfaces to the lateral gap h between the secondary mating surfaces is H / h ≥ 0.3; preferably, H / h ≥ 0.5. For example, the lateral gap H between the main mating surface 431 of the fuselage and the main mating surface 432 of the battery is 0.1 mm, and the lateral gap h between the secondary mating surface 531 of the fuselage and the secondary mating surface 532 of the battery is 0.2 mm. In this embodiment, the ratio of the lateral gap H between the main mating surfaces to the lateral gap h between the secondary mating surfaces is H / h = 1. For example, the lateral gap H between the main mating surface 431 of the fuselage and the main mating surface 432 of the battery, and the lateral gap h between the secondary mating surface 531 of the fuselage and the secondary mating surface 532 of the battery are both 0.2 mm.

[0072] By reasonably setting the ratio of the lateral gap H between the main mating surfaces 430 and the lateral gap h between the secondary mating surfaces 530, the relationship between the two is made to meet the above-mentioned ratio range. In this way, on the basis of ensuring the assembly reliability and convenience of the battery pack 300 and the fuselage 200, the vibration of the battery pack 300 during use is effectively reduced, and the vibration noise is reduced, so that the user can get a better experience.

[0073] In this embodiment, if the insertion and removal stroke of the battery pack along the predetermined direction is L, L is as follows Figure 9 As shown in , 40≤L / H≤700, 40≤L / h≤700. The insertion and removal stroke L of the battery pack 300 along the predetermined direction can be set to 49 mm, or the insertion and removal stroke L of the battery pack 300 along the predetermined direction can be set to 64 mm.

[0074] Different lateral gaps are set according to different plugging and unplugging strokes to ensure that battery packs with different plugging and unplugging strokes have roughly the same plugging and unplugging experience. The selection of the above reasonable values ​​further restrains the vibration of the battery pack, effectively improving the user experience during battery pack installation and use.

[0075] In this embodiment, the ratio of the weight of the battery pack 300 to the lateral fit clearance is greater than or equal to 0.3 kg / mm ​​and less than or equal to 30 kg / mm; the weight of the battery pack 300 can be selected, for example, 300 g, 450 g, 750 g, 3 kg, etc.

[0076] According to the different specifications of battery packs, the appropriate lateral gap is selected and set to control the vibration of battery packs of different weights within a reasonable range. This reduces excessive wear on the mating parts of the battery pack and the body, excessive wear on the connection terminals, and excessive vibration noise caused by the vibration of the battery pack, so as to obtain a better user experience and extend the service life.

[0077] An elastic member 600 is also provided between the main mating surfaces, and the elastic member 600 is used to limit the displacement of the battery pack in a direction intersecting a predetermined direction, such as displacement in a lateral direction perpendicular to the predetermined direction, and displacement intersecting the predetermined direction at an angle, wherein the above-mentioned displacement intersecting the predetermined direction is not limited to the same plane.

[0078] In this embodiment, an elastic member 600 is embedded in the first protrusion 411. The elastic member 600 can be a flexible pin that is laterally inserted into the first protrusion 411. The provision of the elastic member improves the shock absorption effect of the battery pack, which is more conducive to improving the user experience and extending the service life.

[0079] The electric tool of the present invention is provided with a main guide unit and a sub-guide unit between the body and the battery pack. The mating surface gap between the main guide unit and the sub-guide unit is reasonably set according to the specifications and insertion and removal stroke of the battery pack. In this way, on the basis of ensuring the assembly reliability and convenience of the battery pack and the body, the vibration of the battery pack during use is effectively reduced, and the vibration noise is reduced, so that the user has a better experience.

[0080] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of the present invention.

Claims

1. An electric tool comprising: The body comprises a longitudinally extending shell and a mounting portion provided at an end of the shell, wherein the mounting portion is provided with a tool terminal; A battery pack comprising a connecting portion and battery terminals provided thereon, wherein when the battery pack is inserted into the mounting portion in a predetermined direction, the battery terminals are electrically connected to the tool terminals, and the battery terminals are arranged transversely on the battery pack housing in a direction perpendicular to the predetermined direction; a guide portion formed on the mounting portion and the connecting portion, the guide portion guiding the battery pack to be mounted on the mounting portion; It is characterized in that The guide portion includes a main guide unit and a secondary guide unit respectively extending along the predetermined direction, wherein the main guide unit and the secondary guide unit are longitudinally arranged between the connecting portion and the mounting portion; The main guide unit and the auxiliary guide unit are both rigidly matched; wherein the main guide unit includes a main matching surface for transverse matching, the auxiliary guide unit includes an auxiliary matching surface for transverse matching, and the ratio of the transverse gap between the main matching surfaces to the transverse gap between the auxiliary matching surfaces is greater than or equal to 0.

3.

2. The electric tool according to claim 1, wherein: The ratio of the transverse gap between the main mating surfaces to the transverse gap between the auxiliary mating surfaces is greater than or equal to 0.

5.

3. The electric tool according to claim 1, wherein: The main guide unit and the auxiliary guide unit are made of the same material.

4. The electric tool according to claim 3, wherein: The ratio of the weight of the battery pack to the lateral fitting clearance is greater than or equal to 0.3 kg / mm ​​and less than or equal to 30 kg / mm.

5. The electric tool according to claim 3, wherein: The ratio of the insertion and removal stroke of the battery pack along the predetermined direction to the transverse fitting clearance is greater than or equal to 40 and less than or equal to 700.

6. The electric tool according to claim 4 or 5, characterized in that: The main mating surface and the auxiliary mating surface on the mounting portion are arranged in dyads; the main mating surface and the auxiliary mating surface on the connecting portion are arranged in dyads.

7. The electric tool according to any one of claims 2 to 5, characterized in that: The main guide unit includes a fuselage male guide rail provided on the mounting portion and a battery female guide rail provided on the connecting portion; The auxiliary guide unit includes a fuselage female guide rail provided on the mounting portion and a battery male guide rail provided on the connecting portion.

8. The electric tool according to claim 7, wherein: The female guide rail of the body includes a groove and a plurality of spaced ribs arranged on the bottom wall of the groove, and the ribs extend longitudinally; the power tool also includes an elastic member arranged between the main mating surfaces, and the elastic member limits the displacement of the battery pack in a direction intersecting the predetermined direction.

9. An electric tool comprising: The body comprises a longitudinally extending shell and a mounting portion provided at an end of the shell, wherein the mounting portion is provided with a tool terminal; A battery pack comprising a connecting portion and battery terminals provided thereon, wherein when the battery pack is inserted into the mounting portion in a predetermined direction, the battery terminals are electrically connected to the tool terminals, and the battery terminals are arranged transversely on the battery pack housing in a direction perpendicular to the predetermined direction; a guide portion formed on the mounting portion and the connecting portion, the guide portion guiding the battery pack to be mounted on the mounting portion; It is characterized in that The guide portion includes a main guide unit and a secondary guide unit respectively extending along the predetermined direction, wherein the main guide unit and the secondary guide unit are longitudinally arranged between the connecting portion and the mounting portion; The main guide unit and the auxiliary guide unit are both rigidly matched; wherein the main guide unit includes a main matching surface for transverse matching, and the auxiliary guide unit includes an auxiliary matching surface for transverse matching, and the transverse gap between the main matching surfaces and the transverse gap between the auxiliary matching surfaces are both greater than or equal to 0 and less than or equal to 1 mm; the ratio of the weight of the battery pack to the transverse matching gap is greater than or equal to 0.3 kg / mm ​​and less than or equal to 30 kg / mm.

10. The electric tool according to claim 9, wherein: The ratio of the transverse gap between the main mating surfaces to the transverse gap between the auxiliary mating surfaces is greater than or equal to 0.

5.

11. The electric tool according to claim 9, wherein: The ratio of the insertion and removal stroke of the battery pack along the predetermined direction to the transverse fitting clearance is greater than or equal to 40 and less than or equal to 700.

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