CN115156623A

CN115156623A - Electric tool

Info

Publication number: CN115156623A
Application number: CN202210907903.2A
Authority: CN
Inventors: 李祥庆; 王国庆
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2022-10-11

Abstract

The invention relates to an electric tool which comprises a machine shell, a driving mechanism, a reciprocating rod and a motion conversion mechanism, wherein the driving mechanism and the reciprocating rod are arranged in the machine shell, the motion conversion mechanism is connected between the driving mechanism and the reciprocating rod, and the driving mechanism drives the reciprocating rod to reciprocate through the motion conversion mechanism. The electric tool comprises a guide mechanism for guiding the reciprocating rod to do reciprocating motion, the guide mechanism is provided with a guide rail accommodated in the machine shell and a first guide piece connected between the guide rail and the reciprocating rod, the first guide piece is fixed on the reciprocating rod, and the reciprocating rod drives the first guide piece to slide along the end face of the guide rail. The first guide is fixed on the reciprocating rod to move synchronously along the end face of the guide rail along with the reciprocating rod, and the retracting space of the reciprocating rod is not required to be reserved, so that the reciprocating saw is beneficial to miniaturization.

Description

Electric tool

[ technical field ] A

The invention relates to an electric tool, in particular to an electric tool used in occasions such as decoration, buildings and the like.

[ background ] A method for producing a semiconductor device

A reciprocating saw is a reciprocating electric tool for cutting materials such as wood, metal, etc., and is widely used in the fields of furniture decoration, etc. In actual work, the motion conversion mechanism of the reciprocating saw converts the rotary motion of the driving mechanism into the reciprocating motion of the reciprocating rod so as to drive the saw blade to carry out high-frequency cutting operation; the reciprocating rod is generally guided by a pair of bearings fixed to the housing, but the housing has poor support to the bearings, so that the reciprocating rod is easily inclined, thereby affecting cutting efficiency.

The improvement of the above structure can be referred to chinese utility model patent No. CN201295796Y announced in 26/08/2009, which discloses a reciprocating saw, comprising a motor, a large gear engaged with the front end bevel gear part of the motor shaft, a protrusion fixed on the large gear, a bracket connected to the protruding reciprocating rod and accommodating the reciprocating rod, wherein the motor rotates to drive the large gear to move, and further drives the reciprocating rod to reciprocate in the groove of the bracket, and the bracket can guide and support the reciprocating motion of the reciprocating rod, thereby preventing the reciprocating rod from moving. According to the technical scheme, the reciprocating rod penetrates through the grooves at the two ends of the support and moves along the central connecting line of the two grooves, so that the stability is high, the guiding effect is good, however, for the reciprocating saw with a long stroke, more space needs to be reserved for the extension and retraction of the reciprocating rod, and the miniaturization of the whole reciprocating saw is not facilitated; in addition, the bearing is accommodated in the groove of the bracket, so that the bearing is easy to lose efficacy and inconvenient to replace during high-frequency motion. Therefore, the structure can not meet the market demand of the long-stroke miniaturization of the reciprocating saw, and the maintenance is difficult.

Accordingly, there is a need for an improved power tool that overcomes the deficiencies of the prior art.

[ summary of the invention ]

In view of the shortcomings of the prior art, the invention aims to provide a small-sized electric tool which is convenient to maintain.

The invention solves the problems of the prior art by adopting the following technical scheme: an electric tool comprises a machine shell, a driving mechanism, a reciprocating rod and a motion conversion mechanism, wherein the driving mechanism and the reciprocating rod are arranged in the machine shell, the motion conversion mechanism is connected between the driving mechanism and the reciprocating rod, and the driving mechanism drives the reciprocating rod to reciprocate through the motion conversion mechanism; the electric tool comprises a guide mechanism for guiding the reciprocating rod to do reciprocating motion, the guide mechanism is provided with a guide rail accommodated in the machine shell and a first guide piece connected between the guide rail and the reciprocating rod, the first guide piece is fixed on the reciprocating rod, and the reciprocating rod drives the first guide piece to slide along the end face of the guide rail.

The further improvement scheme is as follows: the guide rail has a receiving portion connected to the reciprocating lever, a support portion connected to the first guide member, and a movable space penetrating the support portion, and the first guide member guides the reciprocating lever to reciprocate in the movable space.

The further improvement scheme is as follows: the first guide member has a first coupling portion and a second coupling portion located on both sides of the activity space, and a cross member connecting the first coupling portion and the second coupling portion, and the first coupling portion and the second coupling portion are supported on an end surface of the support portion.

The further improvement scheme is as follows: the first guide part is provided with a third joint part extending from the end face of the cross beam towards the reciprocating rod, and the third joint part is clamped on the periphery of the reciprocating rod.

The further improvement scheme is as follows: the reciprocating lever has to wear to locate sliding part in the portion of accomodating and is fixed in the yoke of sliding part tip, the third joint portion have the butt in the contact surface of yoke and certainly the contact surface is kept away from the sunken cambered surface of yoke, the sliding part accept in the cambered surface.

The further improvement scheme is as follows: the guide mechanism has a slide plate between the guide rail and the first guide member, and the first coupling portion and the second coupling portion slide along a surface of the slide plate.

The further improvement scheme is as follows: the sliding plate is fixed on the supporting part and at least partially covers the outer surface of the supporting part.

The further improvement scheme is as follows: the guide mechanism is provided with a second guide piece arranged in the accommodating part, the second guide piece is sleeved on the periphery of the reciprocating rod, and the first guide piece and the second guide piece are positioned at two ends of the reciprocating rod.

The further improvement scheme is as follows: the second guide piece is provided with a main body part arranged in the accommodating part, a through hole penetrating through the main body part along the axial direction of the reciprocating rod and a transition part protruding from the end face of the main body part far away from the reciprocating rod, and the transition part is matched with the top wall of the accommodating part in shape.

The further improvement scheme is as follows: the first guide piece guides the reciprocating rod to penetrate through the through hole to reciprocate.

Compared with the prior art, the invention has the following beneficial effects: the high-frequency motion of the reciprocating rod is guided by installing a guide mechanism in the gear box. Specifically, the guide mechanism is provided with a guide rail and a first guide piece connected between the guide rail and the reciprocating rod, the first guide piece is fixed on the reciprocating rod to synchronously move along the end face of the guide rail along with the reciprocating rod, the retraction space of the reciprocating rod is not required to be reserved, and the miniaturization of the reciprocating saw is facilitated; in addition, the sliding plate connected between the first guide member and the support portion is fixed to the guide rail by screws, facilitating removal and replacement; meanwhile, the second guide piece is fixed to the accommodating part through the baffle and the screws, and maintenance is convenient.

[ description of the drawings ]

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:

FIG. 1 is a schematic view of the overall structure of a power tool according to a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view of the power tool of FIG. 1;

FIG. 3 is a disassembled schematic view of the major structures within the housing of the power tool of FIG. 1;

FIG. 4 is a schematic structural view of a guide mechanism within the gearbox of FIG. 1;

FIG. 5 is a schematic view of the guide mechanism of FIG. 4 from another angle;

FIG. 6 is a disassembled schematic view of the guide mechanism shown in FIG. 4;

FIG. 7 is a cross-sectional view of the guide mechanism shown in FIG. 4;

FIG. 8 is a cross-sectional view of another angle of the guide mechanism of FIG. 4;

fig. 9 is a partial cross-sectional view of the power tool of fig. 1.

Reciprocating saw 100 casing 1

Main chassis 11 motor part 111

First grip 112 battery connection 113

Joint 114 gearbox 12

Case 121 and case lid 122

Driving mechanism 2 motor 21

Motor shaft 22 tapered portion 23

Motor casing 24 motion conversion mechanism 3

Intermediate shaft 31 big bevel gear 32

Bevel gear 321 positioning pin 322

Eccentric pin 33 crank disk 34

Eccentric portion 341 crank portion 342

Crank pin 35 counterweight 36

Sliding part 41 of reciprocating lever 4

Yoke 42 annular hole 421

Lug 422 guide mechanism 5

Guide rail 51 turning part 511

Accommodating part 512 groove 5121

Support 513 first support arm 5131

The second support arm 5132 connects the arm 5133

Active space 514 first guide 52

First 521 and second 522 joining parts

Third combination part 523 first contact surface 5231

Second contact surface 5232 cambered surface 5233

Cross beam 524 second guide 53

Main body 531 through hole 532

Transition 533 sliding plate 54

The cutter lifting mechanism 6 lifts the cutter wheel 61

Cutter lifting pin 62 clamping mechanism 7

Floor assembly 8 electric control assembly 9

Switch 92 of electric control board 91

Trigger 93 adjusting knob 94

[ detailed description ] embodiments

The present invention will be described in further detail with reference to the drawings and embodiments.

The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Words such as "upper," "lower," "front," "rear," "left," "right," and the like, which indicate orientation or positional relationship, are based only on the orientation or positional relationship shown in the drawings, are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the referenced devices/elements must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Referring to fig. 1 and 2, an embodiment of the present invention relates to an electric power tool, and a reciprocating saw 100 is used as a preferred embodiment of the present invention, and the reciprocating saw 100 is widely used in the fields of decoration, buildings, and the like. The reciprocating saw 100 includes a housing 1, a driving mechanism 2 and a reciprocating rod 4 installed in the housing 1, a motion conversion mechanism 3 connected between the driving mechanism 2 and the reciprocating rod 4, a clamping mechanism 7 installed at a front end of the reciprocating rod 4, a bottom plate assembly 8 for adjusting a length of a blade extending therefrom, an electric control assembly 9 for controlling the driving assembly 2, and a power source (not shown) for supplying electric power, wherein the clamping mechanism 6 fixes the blade (not shown) to the reciprocating rod 4. The driving mechanism 2 is started under the action of a power source to drive the motion conversion mechanism 3 and drive the reciprocating rod 4 and the saw blade to do reciprocating motion, so that the reciprocating saw 100 performs high-frequency cutting operation on a workpiece to be processed.

In the present embodiment, the housing 1 includes a main housing 11 to which the driving mechanism 2 is mounted and a gear case 12 connected to the main housing 11, the main housing 11 has a longitudinally extending and cylindrical motor portion 111, a first grip portion 112 connected to the motor portion 111, a battery connection portion 113 located at a lower end of the first grip portion 112, and a coupling portion 114 connected between the motor portion 111 and the battery connection portion 113, and an operator can grip the first grip portion 112 with one hand or grip the first grip portion 112 and the gear case 12 (i.e., a second grip portion) with both hands to operate the reciprocating saw 100. The gear case 12 has a case 121 for mounting the motion converting mechanism 3 and the reciprocating lever 4, and a case cover 122 fixed to the case 121, and the case 121 and the case cover 122 fix internal parts to prevent them from shaking. Preferably, the gear box 12 can be sleeved with a rubber sleeve to improve the comfort of holding.

As shown in fig. 3, the driving mechanism 2 includes a motor housing 24 installed in the motor unit 111, a motor 21 accommodated in the motor housing 24, a motor shaft 22 protruding into the case 121, and a tapered portion 23 formed at a front end of the motor shaft 22, and the tapered portion 23 is engaged with the motion converting mechanism 3. The motor casing 24 covers the motor 21, and is in modular design and convenient to install. In addition, the motor housing 24 and the motor part 111 form a double-layer housing, which on the one hand forms an insulation protection and on the other hand damps the transmission of vibrations.

The motion conversion mechanism 3 includes an intermediate shaft 31 housed in the case 121, a large bevel gear 32 fitted around the outer periphery of the intermediate shaft 31, a crank disk 34, an eccentric pin 33 connected between the large bevel gear 32 and the crank disk 34, a crank pin 35 connected between the crank disk 34 and the reciprocating rod 4, and a balance weight 36, wherein the intermediate shaft 31 is rotatably attached to the case 121 via a bearing, and the intermediate shaft 31 is disposed substantially perpendicular to the motor shaft 22. The lower end of the large bevel gear 32 is formed with a bevel gear 321, and the motor shaft 22 is located at the lower end of the large bevel gear 32 and is in mesh connection therewith, thereby transmitting the rotation of the driving mechanism 2 to the motion converting mechanism 3. The large bevel gear 32 is provided with a positioning pin 322 which protrudes upwards from the end face, the positioning pin 322 is positioned on the central axis of the intermediate shaft 31, the eccentric pin 33 is inserted onto the large bevel gear 32 in an interference manner, and the eccentric pin 33 deviates from the central axis of the intermediate shaft 31. The crank disk 34 is connected to the large bevel gear 32 by a positioning pin 322 and an eccentric pin 33, and the crank disk 34 eccentrically rotates about the motor shaft 22.

The crank disc 34 has an eccentric portion 341 protruding upward from the lower end surface and a crank portion 342 protruding upward from the upper end surface, and the eccentric portion 341 and the crank portion 342 are located on both sides of the end surface of the crank disc 34 and are distributed on both sides of the plane where the central axis of the intermediate shaft 31 is located. The outer circumference of the eccentric portion 341 is fitted with a weight 36, and the weight 36 is driven to reciprocate substantially along the axial direction of the motor shaft 22. The crank pin 35 is mounted to a crank portion 342, which is connected to the reciprocating rod 4, and reciprocates the reciprocating rod 4 substantially in the axial direction of the motor shaft 22. Preferably, the crank pin 35 is sleeved with a needle bearing and a sleeve. The crank pin 35 and the eccentric portion 341 move the reciprocating rod 4 and the weight 36 in opposite directions, respectively, to reduce vibration.

As shown in fig. 5, the reciprocating lever 4 has a sliding portion 41 having a cylindrical shape and a yoke portion 42 fixed to an end of the sliding portion 41, the yoke portion 42 having an annular hole 421 into which the crank pin 35 is fitted, thereby converting rotation into linear reciprocation.

Referring to fig. 3 to 7, the reciprocating saw 100 further includes a guiding mechanism 5 for guiding the reciprocating rod 4 to reciprocate, and a blade lifting mechanism 6 for driving the reciprocating rod 4 to swing. The guide mechanism 5 is movably installed between the box body 121 and the box cover 122, and the cutter lifting mechanism 6 can drive the guide mechanism 5 to swing along the axial direction of the intermediate shaft 31.

In the present embodiment, the guide mechanism 5 includes a guide rail 51 housed in the gear housing 12, a first guide 52 connected between the guide rail 51 and the reciprocating rod 4, and a second guide 53 retained in the guide rail 51, the first guide 52 is fixed to one end of the reciprocating rod 4, the second guide 53 is fitted around the outer circumference of the reciprocating rod 4, and the second guide 53 is distributed at an end of the reciprocating rod 4 opposite to the first guide 52. When the reciprocating rod 4 reciprocates, the first guide piece 52 moves synchronously with the reciprocating rod 4, and the first guide piece 52 guides and slides along the end surface of the guide rail 51 along with the reciprocating rod 4; at the same time, the second guide 53 is relatively stationary, and the reciprocating lever 4 slides within the second guide 53. The first guide member 52 moves synchronously with the reciprocating rod 4, so that the gear box 12 does not need to reserve a retraction space of the reciprocating rod 4, the overall size of the reciprocating saw 100 is greatly reduced, and the miniaturization is facilitated.

The guide rail 51 includes a rotating portion 511 that contacts between the casing 121 and the casing cover 122, a housing portion 512 connected to the sliding portion 41, a support portion 513 connected to the first guide 52, and a movable space 514 that penetrates the support portion 513, the sliding portion 41 is inserted into the housing portion 512, and the first guide 52 guides the reciprocating lever 4 to slide in the movable space 514 along the extending direction of the support portion 513.

In the present embodiment, the support portion 513 includes a first support arm 5131 and a second support arm 5132 which are symmetrically disposed along the axis of the reciprocating lever 4, and a connection arm 5133 which is connected between the first support arm 5131 and the second support arm 5132, and the first support arm 5131 and the second support arm 5132 have a substantially rectangular shape. The first guide member 52 is supported to upper end surfaces of the first and

second support arms

5131 and 5132.

Preferably, the guide mechanism 5 further has a sliding plate 54 located between the support portion 513 and the first guide member 52, and the sliding plate 54 is fixed on the support portion 513 and at least partially covers the outer surface of the support portion 513, so as to prevent the first guide member 52 and the support portion 513 from directly contacting and causing wear to the support portion 513. Specifically, the sliding plate 54 is substantially U-shaped in cross section and surrounds three faces of the first and

second support arms

5131 and 5132, respectively. The sliding plate 54 is made of metal so as to prolong the service life; the sliding plate 54 is fixed to the support 513 by screws, facilitating installation and replacement for maintenance,

in the present embodiment, the first guide 52 includes a first coupling portion 521 and a second coupling portion 522 positioned on both sides of the movable space 514, a cross member 524 connecting the first coupling portion 521 and the second coupling portion 522, and a third coupling portion 523 extending from an end surface of the cross member 524 toward the reciprocating rod, and the first guide 512 is supported on an end surface of the support portion 513 via the first coupling portion 521 and the second coupling portion 522.

Preferably, the first coupling portion 521 and the second coupling portion 522 contact the outer surface of the sliding plate 54, and the first guide 52 slides along the surface of the sliding plate 54.

As shown in fig. 8, the third coupling portion 523 is held at the outer circumference of the reciprocating rod 4, the third coupling portion 523 includes a first contact surface 5231 and a second contact surface 5232 abutting against the yoke portion 42, and an arc surface 5233 connected between the first contact surface 5231 and the second contact surface 5232, the arc surface 5233 is recessed away from the yoke portion from a plane where the first contact surface 5231 and the second contact surface 5232 are located, the sliding portion 41 is accommodated in the arc surface 5233, the yoke portion 42 includes lugs 422 located at two ends of the sliding portion 41, and the lugs 422 are in screw connection with the third coupling portion 523, so that the assembly is simple and firm.

In the present embodiment, the second guide 53 includes a main body 531 disposed in the receiving portion 512, a through hole 532 penetrating the main body 531 in the axial direction of the reciprocating rod 4, and a transition portion 533 protruding from an end surface of the main body 531 away from the reciprocating rod 4, and the transition portion 533 is adapted to the top wall of the receiving portion 512. The first guide 52 guides the reciprocating rod 4 to reciprocate by being inserted into the through hole 532. The second guide 53 is rotatable within the guide rail 51 to facilitate the installation of the reciprocating lever 4. Preferably, the receiving portion 512 has a groove 5121 penetrating in the axial direction of the reciprocating rod 4, and the second guide 53 is fixed in the groove 5121 by a baffle and a screw, so as to facilitate maintenance and replacement.

As shown in fig. 9, the cutter lifting mechanism 6 includes a cutter lifting wheel 61 fixed to the guide rail 51 and a cutter lifting pin 62 connected to the cutter lifting wheel 61. The knife lifting pin 62 can adjust the knife lifting wheel 61 to abut against or separate from the large gear 32. The upper end surface of the large gear 32 is cam-shaped, and when the knife lifting wheel 61 abuts against the large gear 32, the large gear 32 rotates to drive the knife lifting wheel 61 to move up and down along the axis direction of the intermediate shaft 31, and further drive the guide rail 51 to rotate around the rotating part 511.

Referring to fig. 1 and 2 again, the electronic control assembly 9 has an electronic control board 91 electrically connecting the driving mechanism 2 and the power source, a switch 92 controlling the operation of the driving mechanism 2, a trigger 93 connected to the switch 92, and an adjusting knob 94 adjusting the operating speed of the driving mechanism 2. Specifically, the electric control board 91 may be located in at least one of the motor part 111, the coupling part 114, and the battery connecting part 113. The switch 92 and the trigger 93 are mounted in a first grip portion 112, and when an operator grips the first grip portion 112, the trigger 93 can be pulled to trigger the switch 92, which in turn activates the drive mechanism 2.

The invention is used for guiding the high-frequency movement of the reciprocating rod by installing the guide mechanism 5 in the gear box 12. Specifically, the guide mechanism 5 is provided with a guide rail 51 and a first guide member 52 connected between the guide rail 51 and the reciprocating rod 4, and the first guide member 52 is fixed to the reciprocating rod 4 to move synchronously along the end surface of the guide rail 51 along with the reciprocating rod 4, so that a retraction space of the reciprocating rod 4 is not required to be reserved, and the reciprocating saw 100 is favorably miniaturized; further, a sliding plate 54 connected between the first guide 52 and the support 513 is fixed to the guide rail 51 by screws, facilitating removal and replacement; meanwhile, the second guide 53 is fixed to the receiving portion 512 by a baffle and a screw, and maintenance is facilitated.

The present invention is not limited to the above-described embodiments. It will be readily appreciated by those skilled in the art that many other alternatives to the power tool of the present invention are possible without departing from the spirit and scope of the invention. The protection scope of the present invention is subject to the content of the claims.

Claims

1. An electric tool comprises a machine shell, a driving mechanism and a reciprocating rod which are arranged in the machine shell, and a motion conversion mechanism connected between the driving mechanism and the reciprocating rod, wherein the driving mechanism drives the reciprocating rod to reciprocate through the motion conversion mechanism; the method is characterized in that: the electric tool comprises a guide mechanism for guiding the reciprocating rod to reciprocate, the guide mechanism is provided with a guide rail accommodated in the shell and a first guide piece connected between the guide rail and the reciprocating rod, the first guide piece is fixed on the reciprocating rod, and the reciprocating rod drives the first guide piece to slide along the end face of the guide rail.

2. The power tool of claim 1, wherein: the guide rail has a receiving portion connected to the reciprocating lever, a support portion connected to the first guide member, and a movable space penetrating the support portion, and the first guide member guides the reciprocating lever to reciprocate in the movable space.

3. The power tool of claim 2, wherein: the first guide member has a first coupling portion and a second coupling portion located on both sides of the activity space, and a cross member connecting the first coupling portion and the second coupling portion, and the first coupling portion and the second coupling portion are supported on an end surface of the support portion.

4. The power tool of claim 3, wherein: the first guide piece is provided with a third combining part extending from the end face of the cross beam towards the reciprocating rod, and the third combining part is clamped on the periphery of the reciprocating rod.

5. The power tool of claim 4, wherein: the reciprocating rod is provided with a sliding part penetrating through the accommodating part and a yoke part fixed at the end part of the sliding part, the third combining part is provided with a contact surface abutting against the yoke part and an arc surface which is far away from the yoke part from the contact surface and is sunken, and the sliding part is accommodated in the arc surface.

6. The power tool of claim 3, wherein: the guide mechanism has a slide plate between the guide rail and the first guide member, and the first coupling portion and the second coupling portion slide along a surface of the slide plate.

7. The power tool of claim 6, wherein: the sliding plate is fixed on the supporting part and at least partially covers the outer surface of the supporting part.

8. The power tool of claim 2, wherein: the guide mechanism is provided with a second guide piece arranged in the accommodating part, the second guide piece is sleeved on the periphery of the reciprocating rod, and the first guide piece and the second guide piece are positioned at two ends of the reciprocating rod.

9. The power tool of claim 8, wherein: the second guide piece is provided with a main body part arranged in the accommodating part, a through hole penetrating through the main body part along the axial direction of the reciprocating rod and a transition part protruding from the end face of the main body part far away from the reciprocating rod, and the transition part is matched with the top wall of the accommodating part in shape.

10. The power tool of claim 9, wherein: the first guide piece guides the reciprocating rod to penetrate through the through hole to reciprocate.