CN113510305A

CN113510305A - Reciprocating saw

Info

Publication number: CN113510305A
Application number: CN202010279933.4A
Authority: CN
Inventors: 刘来; 朱化国
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2021-10-19
Anticipated expiration: 2040-04-10
Also published as: CN113510305B

Abstract

The invention discloses a reciprocating saw, comprising: a motor having a motor shaft extending in a first direction; an output shaft driven by the motor to reciprocate; the transmission assembly is connected with the output shaft and the motor shaft; a housing, a length of the housing extending in a first direction and comprising: a through air flow hole; a main housing accommodating the motor; a gearbox for supporting the drive assembly; the reciprocating saw further comprises: the air guide fan is arranged in the shell and is positioned between the motor and the airflow hole, a first gap communicated with the airflow hole is formed between the periphery of a blade of the air guide fan and the inner wall of the shell, and the air guide fan generates heat dissipation airflow which flows through the gear box firstly and drives the heat dissipation airflow to flow into the main shell from the first gap. The invention provides a reciprocating saw which can effectively radiate heat of a motor and a gear box.

Description

Reciprocating saw

Technical Field

The invention relates to a cutting tool, in particular to a reciprocating saw.

Background

A reciprocating saw is an electric tool that performs a saw cutting with a reciprocating saw blade, and is a kind of electric saw. The motor and the transmission assembly are installed in the shell of the reciprocating saw and connected with the cutting saw blade, and the cutting saw blade is driven by the motor to reciprocate through the transmission assembly to achieve cutting. The transmission assembly is arranged at the front end of the motor through a gear box.

The reciprocating saw in the prior art generally arranges a cooling fan at the rear end of the motor to blow forward, and adopts a blowing cooling mode to realize heat dissipation, so that cooling airflow passes through the motor firstly and then flows to the gearbox, the heat productivity of the motor is large, the cooling airflow is hot airflow with high temperature after passing through the motor, the heat dissipation of the gearbox cannot be effectively carried out, and the aging of the gearbox is accelerated.

Accordingly, it is desirable to provide a reciprocating saw that efficiently dissipates heat from the motor and gear box.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide the reciprocating saw which can effectively dissipate heat of the motor and the gear box.

In order to achieve the above object, the present invention adopts the following technical solutions: a reciprocating saw, comprising: a motor having a motor shaft extending in a first direction;

an output shaft driven by the motor to reciprocate;

the transmission assembly is connected with the output shaft and the motor shaft;

a housing, a length of the housing extending in a first direction and comprising:

a through air flow hole;

a main housing accommodating the motor;

a gearbox for supporting the drive assembly;

the reciprocating saw further comprises: the air guide fan is arranged in the shell and is positioned between the motor and the airflow hole, a first gap communicated with the airflow hole is formed between the periphery of a blade of the air guide fan and the inner wall of the shell, and the air guide fan generates heat dissipation airflow which flows through the gear box firstly and drives the heat dissipation airflow to flow into the main shell from the first gap.

Optionally, the reciprocating saw further comprises a flow guiding rib arranged outside the gear box to form an airflow groove, and the airflow groove extends along the first direction and is communicated with the airflow hole.

Optionally, the casing further includes a casing disposed outside the gear box, an air inlet and an air inlet gap connected to the air inlet are disposed between the casing and the gear box, and the air guide rib is disposed in the air inlet gap.

Optionally, the diversion rib is arranged at the top of the gearbox, and the height of one end, far away from the motor, of the diversion rib along the first direction is smaller than the height of one end, close to the motor, of the diversion rib along the first direction.

Optionally, the reciprocating saw further comprises a flow guide cover, the flow guide cover is arranged between the air guide fan and the main shell, and the flow guide cover is sleeved on the periphery of the air guide fan.

Optionally, the air guiding fan is arranged on the output shaft, and a second gap is formed between the stator of the motor and the air guiding fan along the first direction.

Optionally, an air outlet is formed in the casing, the air outlet extends along the circumferential direction of the casing, and the air outlet corresponds to the periphery of the air guide fan.

Optionally, the gear box and the main housing are sequentially arranged along a first direction, and the gear box is connected with the main housing to form a housing;

the air flow hole is arranged at the top of the gear box, and the motor and the air guide fan are arranged in the main shell;

the bottom end of the airflow hole is lower than the front end surface of the main shell.

Optionally, the transmission assembly comprises:

the transmission fluted disc is connected to the motor shaft and can rotate around the axis, the axis is along the vertical direction, and the rotating plane of the transmission fluted disc is parallel to the horizontal plane;

the eccentric block is arranged on the transmission fluted disc, and the output shaft is connected to the eccentric block and can slide back and forth under the driving of the eccentric block.

Optionally, the air inlet is arranged at one end of the gear box far away from the motor, and the air inlet gap is communicated with the air inlet and the air flow hole.

The invention has the advantages that: according to the invention, the through air flow hole is formed in the casing, the air guide fan is arranged between the motor and the air flow hole, the fan generates the heat dissipation air flow which firstly flows through the gear box, the heat dissipation air flow firstly flows through the gear box and then flows into the main casing, the heat dissipation is firstly carried out on the gear box, and then the heat dissipation is carried out on the motor in the main casing, so that the heat dissipation effect can be improved, the heat dissipation air flow is prevented from firstly passing through the motor, the heat productivity of the motor is larger, and the heat dissipation effect on the gear box is reduced.

Drawings

FIG. 1 is a perspective view of a reciprocating saw according to the present application;

FIG. 2 is an enlarged view of a portion of the reciprocating saw of FIG. 1;

FIG. 3 is a side plan view of the reciprocating saw of FIG. 1;

FIG. 4 is an enlarged fragmentary view of the reciprocating saw of FIG. 3;

FIG. 5 is a cross-sectional schematic view of the reciprocating saw shown in FIG. 1;

FIG. 6 is an enlarged fragmentary view of the reciprocating saw of FIG. 5;

FIG. 7 is a schematic structural view of another embodiment of a reciprocating saw of the present application;

FIG. 8 is a cross-sectional schematic view of the reciprocating saw shown in FIG. 7;

FIG. 9 is an enlarged fragmentary view of the reciprocating saw of FIG. 8;

FIG. 10 is a schematic view of a user holding the reciprocating saw of FIG. 7;

fig. 11 is a schematic perspective view of the motor and the air guiding fan according to the present application;

fig. 12 is a schematic plan view of the motor and the fan of fig. 11 according to the present application;

fig. 13 is a schematic perspective view of the motor and the air guiding fan shown in fig. 11 according to another perspective of the present application.

In the figure:

100-reciprocating saw; 101-a motor shaft; 102-an axis; 10-a housing; 20-a motor; 30-a power assembly; 40-a switch assembly; 50-a transmission assembly; 60-a saw blade; 70-a wind guide fan; 80-a dome;

11-flow guiding ribs; 12-an airflow aperture; 13-a first gap; 14-a second gap; 15-air outlet; 16-a gearbox; 17-a main housing; 18-a grip portion; 51-a transmission fluted disc; 52-eccentric mass; 53-an output shaft;

161-upper shell; 162-a lower shell; 163-louvers; 164-a housing; 165-air inlet; 166-air intake gap; 171-screw hole; 71-gap.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

Referring to fig. 1 to 6, the reciprocating saw 100 includes: the air conditioner comprises a machine shell 10, a motor 20, a transmission assembly 50, an output shaft 53 and an air guiding fan 70. The length of the housing 10 extends in a first direction, which may be a front-to-rear direction as shown in the drawings, the housing 10 includes a gear box 16 and a main housing 17, the gear box 16 is used for supporting the transmission assembly 50, that is, the transmission assembly 50 is installed in the gear box 16, and the main housing 17 is used for accommodating and installing the motor 20. The motor 20 has a motor shaft 101 extending in a first direction (front-back direction), the transmission assembly 50 is connected to the output shaft 53 and the motor shaft 101, so that the output shaft 53 reciprocates under the driving of the motor 20, the output shaft 53 is connected to a cutting accessory such as a saw blade 60, and the reciprocating motion of the output shaft 53 realizes the cutting of the saw blade 60 and the cutting function of the reciprocating saw 100. The casing 10 further includes a through airflow hole 12, the air guiding fan 70 is disposed in the casing 10 and located between the motor 20 and the airflow hole 12, as shown in fig. 6, a first gap 13 communicating with the airflow hole 12 is formed between an outer periphery of a blade of the air guiding fan 70 and an inner wall of the casing 10, and the air guiding fan 70 is located between the motor 20 and the airflow hole 12, so that the air guiding fan 70 generates a heat dissipating airflow that first flows through the gear box 16 and drives the heat dissipating airflow to flow into the main housing 17 from the first gap 13. Specifically, as shown by the arrow in fig. 6, under the suction action of the air guiding fan 70, the heat dissipating airflow firstly flows into the airflow hole 12 to dissipate heat of the gear box 16 and the transmission assembly 50 in the gear box 16, and then flows into the main housing 17 from the first gap 13 between the air guiding fan 70 and the inner wall of the housing 10 to dissipate heat of the motor 20, that is, the reciprocating saw 100 of the present invention can firstly dissipate heat of the gear box 16 at the front end of the motor 20 and then dissipate heat of the motor 20, so as to improve the heat dissipation effect, in the prior art, as described in the background art, the heat dissipating airflow is blown to the gear box 16 from the motor 20 by the fan, the heat generation amount of the motor 20 is large, the heat of the heat dissipating airflow passing through the motor 20 is high, and the heat dissipating cannot be effectively dissipated to the gear box 16, but in the present application, the air suction heat dissipating manner is adopted to suck the heat dissipating airflow into the housing 10, and firstly passes through the gear box 16, through motor 20 again, transmission assembly 50 calorific capacity in the gear box 16 is less, and the heat dissipation air current heat through gear box 16 is lower, can also effectually dispel the heat to motor 20, and this application reciprocating saw 100's heat radiation structure reasonable in design can promote the heat dispersion of complete machine, effectually dispels the heat to motor 20 and gear box 16.

Referring to fig. 1 and 2, the reciprocating saw 100 further includes a plurality of flow guiding ribs 11, the flow guiding ribs 11 are disposed outside the gear box 16, and airflow slots are formed between adjacent flow guiding ribs 11, the airflow slots extend along a first direction (front-back direction) and are communicated with the airflow holes 12, so that the airflow guided by the flow guiding ribs 11 flows into the airflow holes 12 and enters the inside of the housing 10. Preferably, the guide rib 11 is integrally formed on the gear housing 16. The airflow hole 12 may be formed in the gear housing 16 and integrally formed in the gear housing 16. Preferably, the airflow holes 12 also extend along the first direction (front-back direction), the airflow holes 12 are multiple, each airflow hole 12 corresponds to one airflow slot, that is, one airflow hole 12 is arranged between every two adjacent flow guide ribs 11, the airflow slot formed between the two adjacent flow guide ribs 11 is communicated with the airflow hole 12, each airflow hole 12 corresponds to one airflow slot, so that the density of the airflow hole 12 and the density of the airflow slot are higher, the air guiding effect and the air intake are improved, in addition, the airflow holes 12 are arranged to be long strips extending along the first direction (front-back direction), and the air intake can be further improved.

As shown in FIG. 1, the reciprocating saw 100 further includes a power assembly 30 and a switch assembly 40, the power assembly 30 being used to power the motor 20, the power assembly 30 being a cord connected to a power jack in the embodiment shown in the drawings of the present application, and the direct AC connection powering the reciprocating saw 100, and in other embodiments, the power assembly 30 may be a battery pack. The switch assembly 40 is at least partially disposed in the casing 10, and is capable of allowing or prohibiting the power assembly 30 from providing power to the motor 20, and the assembly structure of the switch assembly 40 and the casing 10 is designed such that the switch assembly 40 can be touched by a user from outside the casing 10 to implement the switch control, for example, as shown in fig. 5, the switch assembly 40 is disposed on the casing 10, partially inside the casing 10, and partially outside the casing 10, so that the user can touch the switch assembly 40 from outside the casing 10.

Referring to fig. 7 to 9, the casing 10 further includes a casing 164 disposed outside the gear box 16, referring to fig. 9, an air inlet 165 and an air inlet gap 166 connected to the air inlet 165 are disposed between the casing 164 and the gear box 16, and the air guiding rib 11 is disposed in the air inlet gap 166, so that the heat dissipating airflow can flow in from the air inlet 165 at the front end, enter the air inlet gap 166 between the casing 164 and the gear box 16, and flow into the airflow hole 12 along the air guiding rib 11 in the air inlet gap 166, and enter the inside of the casing 10. The provision of the air inlet 165 and the air inlet gap 166 between the casing 164 and the gear housing 16 allows the heat dissipation air flow to smoothly flow into the interior of the casing 10 without being blocked by the casing 164 outside the casing 10. The housing 164 is generally made of a non-slip heat-insulating material such as plastic or rubber, and when the user holds the housing 10 with the reciprocating saw 100, as shown in fig. 10, the housing 164 can perform a non-slip and heat-insulating function and also can reduce vibration. Preferably, as shown in fig. 7 and 10, a slip prevention ridge 167 may be provided on the bottom of the housing 164.

Referring to fig. 9, the air inlet 165 is disposed at an end of the gear housing 16 away from the motor 20, and the air inlet gap 166 is communicated with the air inlet 165 and the air flow hole 12 to facilitate smooth flow of the heat dissipating air into the air flow hole 12.

As shown in fig. 5 and 6, the motor shaft 101 of the motor 20 is substantially arranged along the front-back direction, the motor shaft 101 is parallel to the front-back direction, or forms a certain angle with the front-back direction, when the motor shaft 101 is parallel to the front-back direction, the motor 20 is horizontally arranged forward, and when the motor shaft 101 forms a certain angle with the front-back direction, the motor 20 is obliquely arranged forward, in the present invention, the motor 20 is preferably horizontally arranged forward, so that the motor 20 can be along the direction of the heat dissipation airflow, and the heat dissipation effect is better.

The driving assembly 50 is at least partially disposed in the casing 10, that is, a part of the driving assembly 50 may also be exposed from the front end of the casing 10, so that the driving assembly 50 is conveniently connected to the saw blade 60, although the driving assembly 50 may also be entirely disposed in the casing 10, and the saw blade 60 may extend into the casing 10 and be connected to the driving assembly 50. The saw blade 60 is attached to the reciprocating saw 100 only when the reciprocating saw 100 is in use and is removed for storage when not in use, i.e., the reciprocating saw 100 of the present application may have two states, one connected to the saw blade 60 and the other connected to the saw blade 60, both of which are within the scope of the present application.

The air guide ribs 11 may be disposed anywhere on the gear case 16, for example, on the top, bottom, left side, or right side of the gear case 16. In one embodiment, as shown in FIGS. 1 and 2, the air guide ribs 11 are disposed on the top of the gear housing 16 so that a user's hand can hold the bottom of the gear housing 16 when using the reciprocating saw 100. the user's hand holds the bottom of the gear housing 16 as shown in FIG. 10. In addition, the diversion ribs 11 are disposed on the top of the housing 10, so as to increase the air intake and further increase the heat dissipation effect of the reciprocating saw 100. As shown in fig. 6, the height a of the diversion rib 11 at the end far away from the motor 20 in the first direction (front-back direction), that is, the height a of the front end of the diversion rib 11, is smaller than the height b of the diversion rib 11 at the end near the motor 20 in the first direction (front-back direction), that is, is smaller than the height b of the rear end of the diversion rib 11, so that the diversion rib 11 is wedge-shaped, and the height is gradually increased from front to rear, and the height of the rear end is higher, so as to lock the heat dissipation airflow, thereby avoiding the heat dissipation airflow loss in the airflow channel, and making the heat dissipation airflow completely enter the airflow hole 12, and then enter the casing 10, thereby improving the diversion effect and increasing the intake.

Referring to fig. 6, the air guiding fan 70 is disposed on the motor shaft 101 of the motor 20, and a second gap 14 is formed between the stator of the motor 20 and the air guiding fan 70 along the first direction (front-back direction), so as to improve the heat dissipation effect of the motor 20. As shown in fig. 6, an air outlet 15 is disposed on the casing 10, the air outlet 15 extends along the circumferential direction of the casing 10, the air outlet 15 is disposed corresponding to the periphery of the air guiding fan 70, the flow direction of the heat dissipating air flow is as indicated by the arrow in fig. 6, the heat dissipating air flow enters the casing 10 from the air flow hole 12, then dissipates heat to the gear box 16, enters the motor 20 from the first gap 13 between the air guiding fan 70 and the casing 10, is sucked into the air guiding fan 70 from the second gap 14 between the motor 20 and the air guiding fan 70, and is discharged to the outside of the casing 10 through the air outlet 15 of the casing 10 in the circumferential direction of the air guiding fan 70. The second gap 14 is disposed between the stator of the motor 20 and the air guiding fan 70, which is not only beneficial to heat dissipation of the motor 20, but also provides a channel for the heat dissipation airflow, so that the heat dissipation airflow is sucked into the air guiding fan 70 and discharged through the air outlet 15. The heat dissipation airflow flows to the space between the motor 20 and the air guiding fan 70 without passing through the inside of the iron core of the motor 20, so that dust is not brought into the inside of the motor 20, dust accumulation in the motor 20 is avoided, the motor 20 runs more stably, and the service life of the motor 20 is prolonged. It is understood that, in the circumferential direction of the air guiding fan 70, a structure, such as a through hole, may be provided to enable the heat dissipation airflow to flow out from the circumferential direction of the air guiding fan 70, so as to enable the heat dissipation airflow to flow out from the circumferential direction of the air guiding fan 70 to the air outlet 15.

Referring to fig. 6, in the present application, the air guiding fan 70 absorbs air to dissipate heat through the rear end surface (i.e. the back surface of the air guiding fan 70), and absorbs the heat dissipating air flow into the casing 10 by adopting an air absorbing manner. Referring to fig. 11 to 13, a notch 71 is disposed at a front end of the air guiding fan 70, and the notch 71 may be used to enable the air flow in the casing 10 and also to achieve the installation and positioning of the air guiding fan 70.

Referring to fig. 5 and 6, the reciprocating saw 100 further includes a wind deflector 80, the wind deflector 80 is disposed between the wind guiding fan 70 and the main housing 17, the wind deflector 80 is sleeved on the periphery of the wind guiding fan 70, and the wind deflector 80 is disposed to facilitate the wind guiding fan 70 to discharge the heat dissipating airflow from the air outlet 15. As described above, after the heat dissipation airflow dissipates heat of the motor 20, the heat is sucked into the air guiding fan 70 from the second gap 14 between the motor 20 and the air guiding fan 70, and is exhausted out of the housing 10 from the air outlet 15 in the circumferential direction of the air guiding fan 70, in this process, if the air guiding cover 80 is not provided, the blade tip loss of the air guiding fan 70 during operation is large due to the excessively large distance between the outer diameter of the blade of the air guiding fan 70 and the inner wall of the housing 10, which leads to the reduction of the air volume finally exhausted from the air outlet 15, and affects the heat dissipation effect of the reciprocating saw 100, and the air guiding cover 80 is provided at the periphery of the air guiding fan 70 to reduce the blade tip loss of the air guiding fan 70. In addition, the air guide sleeve 80 is also beneficial to guiding the flow direction of the heat dissipation airflow in the first gap 13 and the second gap 14, so that the convergence degree of the heat dissipation airflow is improved, and the airflow dispersion or loss is avoided.

Preferably, as shown in fig. 1, the gear box 16 and the main housing 17 are sequentially arranged along a first direction (front-back direction), the gear box 16 and the main housing 17 are connected by screws or bolts to form the complete housing 10, the air flow hole 12 and the air guiding rib 11 are arranged at the top of the gear box 16, and the motor 20 and the air guiding fan 70 are arranged in the main housing 17. Referring to fig. 6, the bottom end of the airflow hole 12 is lower than the front end surface of the main housing 17, specifically, the bottom end of the airflow hole 12 is lower than the inner wall of the front end of the main housing 17 by a predetermined distance c, so that a part of the heat dissipation airflow flowing from the outside of the housing 10 into the airflow hole 12 can directly enter the first gap 13 from the airflow hole 12 to the rear, and flow to the motor 20, thereby better dissipating heat from the motor 20.

In addition, as shown in fig. 2, the gear box 16 may be configured as an upper and lower shell structure, which includes an upper shell 161 and a lower shell 162, the upper shell 161 and the lower shell 162 are connected by screws or bolts, and the air guide ribs 11 and the airflow holes 12 are disposed on the upper shell 161. The rear end of the lower case 162 is coupled to the main case 17, and after the lower case 162 is coupled to the main case 17, the transmission assembly 50 is installed in the lower case 162, and then the upper case 161 is covered on the lower case 162 and fixed by screws or bolts. Providing the gear case 16 as an upper and lower case structure may facilitate the design of the mold and the molding of the upper and lower cases. In addition, the upper and lower shells may be constructed such that the lower shell 162 is first mounted to the main housing 17, thereby facilitating the mounting of the transmission assembly 50 in the lower shell 162, and the upper and lower shells are more convenient for mounting the transmission assembly 50, compared to the conventional left and right half shell structure. As shown in fig. 2, the flow guiding ribs 11 extend to the rear end of the upper shell 161, so as to improve the heat dissipation effect to the maximum extent.

Referring to fig. 3 and 4, the front end of the main housing 17 is provided with a screw hole 171 for coupling with the lower housing 162, and the wall of the screw hole 171 protrudes from the front end surface of the main housing 17 in the front-rear direction so that the lower housing 162 is coupled with the screw hole 171, and the air outlet 15 is formed between the gear case 16 and the main housing 17 without affecting the assembly of the lower housing 162 and the main housing 17.

Referring to fig. 6, the transmission assembly includes a transmission toothed disc 51 and an eccentric block 52. The transmission fluted disc 51 is connected to the motor shaft 101 of the motor 20 and can rotate around the axis 102, the axis 102 is along the vertical direction, that is, along the up-down direction, and the rotation plane of the transmission fluted disc 51 is parallel to the horizontal plane, so that the rotation plane of the transmission fluted disc 51 is parallel to the flowing direction of the heat dissipation airflow, and the heat dissipation airflow flows along the transmission fluted disc 51, thereby reducing the resistance of the transmission fluted disc 51 to the heat dissipation airflow and improving the heat dissipation effect. The eccentric block 52 is arranged on the transmission fluted disc 51 and is arranged on the transmission fluted disc 51 at a position deviating from the center of the transmission fluted disc 51, and the transmission fluted disc 51 drives the eccentric block 52 to rotate when rotating. The output shaft 53 is connected to the eccentric block 52, and the output shaft 53 can slide back and forth under the driving of the eccentric block 52 to drive the saw blade 60 at the front end of the output shaft 53 to move back and forth, so as to realize cutting.

Referring to fig. 3 and 4, the bottom of the gear box 16 is provided with a plurality of heat dissipation holes 163, and the heat dissipation holes 163 are provided to not only improve the heat dissipation effect, but also reduce the weight, save the material of the housing 10, and make the reciprocating saw 100 more portable and more convenient to use.

Referring to fig. 10, the rear end of the main housing 17 is provided with a grip 18, and when the user uses the reciprocating saw 100, the user holds the grip 18 with one hand and holds the bottom of the gear housing 16 with the other hand.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims

1. A reciprocating saw, comprising: a motor having a motor shaft extending in a first direction;

an output shaft driven by the motor to reciprocate;

a transmission assembly connecting the output shaft and the motor shaft;

a housing having a length extending in the first direction and comprising:

a through air flow hole;

a main housing accommodating the motor;

a gearbox for supporting the drive assembly;

the reciprocating saw further comprises:

the air guide fan is arranged in the shell and is positioned between the motor and the air flow hole, a first gap communicated with the air flow hole is formed between the periphery of a blade of the air guide fan and the inner wall of the shell, and the air guide fan generates heat dissipation air flow which firstly flows through the gear box and drives the heat dissipation air flow to flow into the main shell from the first gap.

2. The reciprocating saw as defined in claim 1, wherein:

the reciprocating saw further comprises a flow guide rib which is arranged outside the gear box to form an airflow groove, and the airflow groove extends along the first direction and is communicated with the airflow hole.

3. The reciprocating saw as defined in claim 2, wherein:

the casing still including set up in the clamshell in the gear box outside, the clamshell with have the air intake between the gear box and connect the air inlet clearance of air intake, the water conservancy diversion muscle is set up in the air inlet clearance.

4. The reciprocating saw as defined in claim 2, wherein:

the water conservancy diversion muscle is located the top of gear box, the water conservancy diversion muscle is followed keep away from in the first direction the height of the one end of motor is less than the water conservancy diversion muscle is followed in the first direction is close to the height of the one end of motor.

5. The reciprocating saw as defined in claim 1, wherein:

the reciprocating saw further comprises a flow guide cover, the flow guide cover is arranged between the air guide fan and the main shell, and the flow guide cover is sleeved on the periphery of the air guide fan.

6. The reciprocating saw as defined in claim 1, wherein:

the wind guide fan is arranged on the output shaft, and a second gap is formed between the stator of the motor and the wind guide fan along the first direction.

7. The reciprocating saw as defined in claim 5, wherein:

the air outlet is arranged on the casing, extends along the circumferential direction of the casing, and corresponds to the periphery of the air guide fan.

8. The reciprocating saw as defined in claim 1, wherein:

the gear box and the main shell are sequentially arranged along the first direction, and the gear box is connected with the main shell to form the machine shell;

9. The reciprocating saw as defined in claim 3, wherein:

the transmission assembly includes:

the transmission fluted disc is connected to the motor shaft and can rotate around an axis, the axis is along the vertical direction, and the rotating plane of the transmission fluted disc is parallel to the horizontal plane;

10. The reciprocating saw as defined in claim 3, wherein:

the air inlet is arranged at one end of the gear box far away from the motor, and the air inlet gap is communicated with the air inlet and the airflow hole.