CN214023826U

CN214023826U - Reciprocating electric tool

Info

Publication number: CN214023826U
Application number: CN202022482600.XU
Authority: CN
Inventors: 彭小湖
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-08-24
Anticipated expiration: 2030-10-30

Abstract

A reciprocating electric tool comprises a shell, a motor, a transmission mechanism and a reciprocating rod assembly, wherein the motor is located in the shell, the transmission mechanism is driven by the motor, the reciprocating rod assembly is driven by the transmission mechanism, and the motor is located above the transmission mechanism and is provided with a motor shaft extending downwards. The transmission mechanism comprises a plurality of planetary gears meshed with the lower end of the motor shaft and a planet carrier driven by the planetary gears, the planet carrier is provided with a circular base located below the planetary gears and an eccentric pin located on the lower end face of the base and far away from the circle center of the base, the reciprocating rod assembly is connected to the eccentric pin, and the motor drives the reciprocating rod assembly to reciprocate longitudinally through the transmission mechanism. Therefore, the base of the planet carrier and the motor shaft of the motor have the same central axis, so that the reciprocating electric tool is more compact in overall structure, the size of the reciprocating electric tool is reduced, and the reciprocating electric tool is convenient to hold by a user.

Description

Reciprocating electric tool

[ technical field ]

The utility model relates to an electric tool technical field, in particular to reciprocating type electric tool of compact structure.

[ background art ]

The reciprocating electric tool is a common tool, the cutting object can be wood, metal or the mixture of the materials, and the reciprocating electric tool is suitable for occasions such as home decoration because the cutting object is wide and convenient to carry. The reciprocating electric tool cuts a workpiece through the linear reciprocating motion of a saw blade, and the common reciprocating electric tool (such as a reciprocating saw, a saber saw and the like) converts the rotary motion of a motor into the reciprocating motion of a reciprocating rod through various transmission mechanisms (such as an eccentric wheel, a swing rod and the like). However, the rotation center of the eccentric wheel in the conventional reciprocating electric tool is not coaxial with the central axis of the motor, so that the overall structure of the reciprocating electric tool is overlarge, the control switch of the reciprocating electric tool is relatively far away from a workpiece and is not easy to control, and a user can easily feel tired when holding the reciprocating electric tool for a long time and the use feeling is poor.

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

[ contents of utility model ]

To the deficiency of the prior art, an object of the utility model is to provide a reciprocating electric tool, this reciprocating electric tool's compact structure, convenient to use and the operation of being convenient for.

The utility model provides a technical scheme that prior art problem adopted is: a reciprocating power tool includes a housing, a motor located in the housing, a drive mechanism driven by the motor, and a reciprocating lever assembly driven by the drive mechanism, the motor being located above the drive mechanism and having a motor shaft extending downward. The transmission mechanism comprises a plurality of planetary gears meshed with the lower end of the motor shaft and a planet carrier driven by the planetary gears, the planet carrier is provided with a circular base located below the planetary gears and an eccentric pin located on the lower end face of the base and far away from the circle center of the base, the reciprocating rod assembly is connected to the eccentric pin, and the motor drives the reciprocating rod assembly to reciprocate longitudinally through the transmission mechanism.

The further improvement scheme is as follows: the base of the planet carrier and the motor shaft of the motor have the same central axis, and the central axis of the motor shaft is vertical to the longitudinal direction.

The further improvement scheme is as follows: the transmission mechanism comprises a transmission gear connected to the lower end of the motor shaft, the upper end of the transmission gear is fixed to the lower end of the motor shaft, the lower end of the transmission gear is meshed with the planetary gears, and the planetary gears are evenly distributed around the circumference of the lower end of the transmission gear.

The further improvement scheme is as follows: the planet carrier is equipped with and is located base up end just follows circumference evenly distributed's several round pin post, planetary gear correspond connect in on the round pin post, in order to drive the planet carrier rotates.

The further improvement scheme is as follows: the planet carrier is provided with a balancing weight which is positioned on the lower end face of the base, and the balancing weight and the base are integrally formed and are far away from the circle center of the base.

The further improvement scheme is as follows: the transmission mechanism comprises a gear box body connected to the shell, the planetary gear and the planet carrier are contained in the gear box body, and the reciprocating rod assembly longitudinally extends out of the gear box body.

The further improvement scheme is as follows: the gearbox casing comprises an upper casing body and a lower casing body which are buckled up and down, the upper casing body is accommodated in the casing, and the lower casing body is exposed below the casing.

The further improvement scheme is as follows: the transmission mechanism comprises an inner gear ring sleeved on the outer side of the planetary gear, the inner gear ring is fixed in the upper box body, and the planetary gear is internally meshed with the inner gear ring.

The further improvement scheme is as follows: the transmission structure comprises a supporting bearing which is sleeved on the planet carrier and arranged on the outer side of the base, and the supporting bearing is fixed in the lower box body to support the planet carrier.

The further improvement scheme is as follows: the reciprocating rod assembly comprises a reciprocating rod extending along the longitudinal direction, a cutter chuck positioned at one end of the reciprocating rod in the longitudinal direction and a sliding groove positioned at the other end of the reciprocating rod in the longitudinal direction, and the eccentric pin is connected into the sliding groove so that the planet carrier drives the reciprocating rod assembly to reciprocate.

Compared with the prior art, the utility model discloses following beneficial effect has: the transmission mechanism comprises a plurality of planetary gears meshed with the lower end of the motor shaft and a planet carrier driven by the planetary gears, the planet carrier is provided with a circular base located below the planetary gears and an eccentric pin located on the lower end face of the base and far away from the circle center of the base, the reciprocating rod assembly is connected to the eccentric pin, and the motor drives the reciprocating rod assembly to reciprocate longitudinally through the transmission mechanism. Therefore, the base of the planet carrier and the motor shaft of the motor have the same central axis, so that the reciprocating electric tool is more compact in overall structure, the size of the reciprocating electric tool is reduced, and the reciprocating electric tool is convenient to hold by a user.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

FIG. 1 is a perspective view of a reciprocating power tool in accordance with a preferred embodiment of the present invention;

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

FIG. 3 is a schematic view of the motor and drive mechanism assembly of the reciprocating power tool of FIG. 1;

FIG. 4 is an exploded view of the motor and transmission shown in FIG. 3;

FIG. 5 is an exploded view of the motor and gear train shown in FIG. 4 from another angle;

fig. 6 is a cross-sectional view of the motor and transmission mechanism shown in fig. 3.

The meaning of the reference symbols in the figures:

100. reciprocating electric tool 1, housing 11, main body 110, first accommodation space 12, grip 120, second accommodation space 13, control button 14, second grip 2, motor 21, motor shaft 22, transmission gear 23, upper end bearing 24, lower end bearing 3, transmission mechanism 31, gear box 32, upper box 33, lower box 34, sliding sleeve 4, reciprocating rod assembly 41, reciprocating rod 42, tool chuck 43, sliding groove 50, planet carrier 51, planetary gear 52, base 53, pin 54, eccentric pin 55, counter weight 56, inner gear ring 57, support bearing 6, power supply assembly 7, baffle 8, tool attachment part 6

[ detailed description of the invention ]

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," and the like, which indicate orientation or positional relationships, are used solely to facilitate the description of the 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 invention.

Referring to fig. 1, a reciprocating power tool 100 according to the present invention is shown, in this embodiment, the reciprocating power tool 100 is a saber saw operable to drive a cutter attachment 8 (e.g., a saw blade) in a reciprocating motion to cut a workpiece. In other embodiments, the reciprocating power tool 100 may be a different type of device configured to drive the cutter attachment 8 in a reciprocating motion.

Referring to fig. 1 to 2, the reciprocating power tool 100 includes a housing 1, a motor 2 disposed in the housing 1, a transmission mechanism 3 driven by the motor 2, and a reciprocating lever assembly 4 driven by the transmission mechanism 3, wherein the cutter attachment 8 is connected to the reciprocating lever assembly 4. The housing 1 is formed with a receiving space for mounting components such as a motor 2 for supplying power to the reciprocating power tool 100 and a transmission mechanism 3 for transmitting the power of the motor 2 to the cutter attachment 8 to drive the cutter attachment 8 to reciprocate to cut a workpiece. It will be appreciated that the reciprocating power tool 100 may be coupled with different cutter attachments to cut different objects.

The reciprocating electric tool 100 further includes a power supply unit 6 for supplying power to the motor 2, and a baffle 7 provided in front of the cutter attachment 8, and in this embodiment, the power supply unit 6 is embodied as a battery pack attached to the rear end of the housing 1 in the longitudinal direction. The flap 7 is provided at the longitudinal front end of the housing 1, and when cutting work is performed, the flap 7 is brought into contact with a material to be cut, so that cutting can be performed in a more reliable manner.

The casing 1 is provided with a main body part 11 vertically arranged and a holding part 12 connected to the rear of the main body part 11 and longitudinally extending, the holding part 12 can be held by a user and is provided with a control button 13 for operation, and the control button 13 is used for controlling the working state of the reciprocating electric tool 100. The accommodating space includes a first accommodating space 110 formed in the main body portion 11 and a second accommodating space 120 formed in the grip portion 12, and the first accommodating space 110 and the second accommodating space 120 are longitudinally arranged in the front-back direction. The first receiving space 110 is used for mounting power components such as the motor 2 and the transmission mechanism 3, and the second receiving space 120 is used for mounting components such as operating parts, electronic components, and circuit boards. It is understood that, in order to install the components with larger volume of the motor 2 and the transmission mechanism 3, the first accommodating space 110 is larger than the second accommodating space 120, and the first accommodating space 110 and the second accommodating space 120 are communicated or partially closed.

In the present embodiment, the main body portion 11 of the housing 1 is further formed with a second grip portion 14 which is located at the front portion of the upper end thereof and which can be gripped by a user. Under a common cutting condition, a user can realize cutting operation by holding the holding part 12, but for some workpieces with hard texture or rough surface, the user needs to hold the second holding part 14 with one hand while holding the holding part 12 with the other hand, so that more stable and safer cutting operation is realized. In other embodiments, the second holding portion 14 may further be formed with holding grooves (not shown) according to the holding requirement of the user, and the holding grooves are substantially distributed according to the holding direction of the fingers and the gap, so as to facilitate the user to hold more firmly. With this design, the user can hold the reciprocating power tool 100 in a preferred state for a long period of time. This allows for more complex operating conditions and is more comfortable for the user during operation.

Referring to fig. 3 and 6, the motor 2 is located above the transmission mechanism 3 and includes a motor shaft 21 protruding into the transmission mechanism 3 and a transmission gear 22 located at the end of the motor shaft 21, and the motor shaft 21 extends vertically. In the present embodiment, the transmission gear 22 is a pinion gear that is assembled and fixed to the end of the motor shaft 21, and in other embodiments, the transmission gear 22 may be a motor shaft tooth that is integrally formed on the motor shaft 21 by machining. As shown in fig. 2, the motor 2 further includes an upper end bearing 23 and a lower end bearing 24 respectively disposed at the upper end and the lower end of the motor shaft 21, the upper end bearing 23 is fixed to the inner wall of the main body 11, and the lower end bearing 24 is fixed to the gear housing 31 of the transmission mechanism 3, so as to support the motor 2 in the housing 1.

Referring to fig. 4 to 6, the transmission mechanism 3 includes a gear housing 31 and a planetary gear mechanism accommodated in the gear housing 31, the gear housing 31 is connected to the main body portion 11 of the casing 1 and includes an upper housing 32 and a lower housing 33 that are engaged up and down, and the upper housing 32 and the lower housing 33 may be fixed and connected to a lower portion of the main body portion 11 by a fastening member such as a screw. The upper case 32 is accommodated in the main body 11 of the housing 1, and the lower case 33 is exposed below the main body 11 of the housing 1. In this embodiment, the motor shaft 21 passes through the upper case 32 to protrude into the gear case 31, the reciprocating lever assembly 4 longitudinally extends forward out of the lower case 33 of the gear case 31, and the baffle 7 is fixed to the longitudinal front end of the lower case 33 of the gear case 31 and longitudinally protrudes forward of the reciprocating lever assembly 4.

The planetary gear train mechanism includes a plurality of planetary gears 51 engaged with the lower end of the motor shaft 21 and a planetary carrier 50 driven by the planetary gears 51, and the reciprocating lever assembly 4 is connected to the planetary carrier 50. In this embodiment, the transmission gear 22 can be regarded as a part of the transmission mechanism 3, the upper end of the transmission gear 22 is fixed to the lower end of the motor shaft 21, the lower end of the transmission gear 22 is meshed with the planetary gears 51, and the plurality of planetary gears 51 surround the lower end of the transmission gear 22 and are uniformly distributed along the circumferential direction.

The planet carrier 50 is provided with a circular base 52 located below the planetary gear 51, a plurality of pins 53 located on the upper end surface of the base 52, and an eccentric pin 54 and a counterweight 55 located on the lower end surface of the base 52, wherein the eccentric pin 54 and the counterweight 55 are arranged opposite to each other. The base 52 rotates around its central axis, a plurality of pins 53 are uniformly distributed on the upper end surface of the base 52 along the circumferential direction, and the planetary gears 51 are correspondingly connected to the pins 53 to drive the planetary carrier 50 to rotate around its central axis. The eccentric pin 54 is eccentrically disposed away from the center of the base 52, and the reciprocating rod assembly 4 is connected to the eccentric pin 53, that is, the eccentric pin 53 drives the reciprocating rod assembly 4 to reciprocate along the longitudinal direction. The weight 55 is integrally formed with the base 52 and is disposed away from the center of the base 52 to reduce the inertia force of the reciprocating rod assembly 4 during the reciprocating motion.

The transmission mechanism 3 further includes an inner gear ring 56 disposed on the outer side of the planetary gear 51 and a support bearing 57 disposed on the outer side of the base 52 of the planet carrier 50. The inner gear ring 56 is fixed in the upper case 32, and the planetary gears 51 are engaged with the inner gear ring 56 to ensure the normal operation of the transmission mechanism 3. The support bearing 57 is fixed in the lower case 33 to support the carrier 50 in the lower case 33 of the gear case 31.

As can be seen from the above, the base 52 of the planetary carrier 50 and the motor shaft 21 of the motor 2 have the same central axis, and the motor 2 drives the reciprocating rod assembly 4 to reciprocate along the longitudinal direction perpendicular to the central axis of the motor 2 through the planetary gear train mechanism of the transmission mechanism 3, so that the overall structure of the reciprocating electric tool 100 is more compact, the requirement for the size of the first accommodating space 110 in the main body portion 11 is effectively reduced, the overall size of the reciprocating electric tool 100 is reduced, and the tool is convenient for a user to hold.

In this embodiment, the reciprocating rod assembly 4 includes a reciprocating rod 41 extending along a longitudinal direction, a tool chuck 42 located at one longitudinal end of the reciprocating rod 41, and a sliding groove 42 located at the other longitudinal end of the reciprocating rod 41, and the tool attachment 8 is connected and fixed to the tool chuck 42. The eccentric pin 54 is coupled to the sliding groove 42 to reciprocate the planet carrier 50 with the reciprocating lever assembly 4. Meanwhile, the gear box 31 is further provided with a sliding sleeve 34 fixedly connected to the front end of the lower box 33, and the reciprocating rod 41 passes through the sliding sleeve 34 and reciprocates in the longitudinal direction.

The utility model discloses in, drive mechanism 3 is including meshing in several planetary gear 51 of motor shaft 21 lower extreme and by planetary gear 51 driven planet carrier 50, planet carrier 50 is equipped with the circular base 52 that is located planetary gear 51 below and is located the lower terminal surface of base 52 and keeps away from the eccentric pin 54 that the centre of a circle of base 52 set up, reciprocating lever subassembly 4 is connected in eccentric pin 54, motor 2 drives reciprocating lever subassembly 4 through drive mechanism 3 and along vertically doing reciprocating motion. With this arrangement, the base 52 of the planet carrier 50 and the motor shaft 21 of the motor 2 have the same central axis, so that the overall structure of the reciprocating power tool 100 is more compact, the requirement for the size of the first accommodating space 110 in the main body 11 is effectively reduced, the overall size of the reciprocating power tool 100 is reduced, and the tool is convenient for a user to hold.

The present invention is not limited to the above-described embodiments. It will be readily appreciated by those skilled in the art that numerous alternatives to the reciprocating power tool described herein may be made without departing from the principles and scope of the invention. The protection scope of the present invention is subject to the content of the claims.

Claims

1. A reciprocating power tool comprising a housing, a motor located within the housing, a drive mechanism driven by the motor and a reciprocating lever assembly driven by the drive mechanism, the motor being located above the drive mechanism and having a downwardly extending motor shaft; the method is characterized in that: the transmission mechanism comprises a plurality of planetary gears meshed with the lower end of the motor shaft and a planet carrier driven by the planetary gears, the planet carrier is provided with a circular base located below the planetary gears and an eccentric pin located on the lower end face of the base and far away from the circle center of the base, the reciprocating rod assembly is connected to the eccentric pin, and the motor drives the reciprocating rod assembly to reciprocate longitudinally through the transmission mechanism.

2. The reciprocating power tool of claim 1, wherein: the base of the planet carrier and the motor shaft of the motor have the same central axis, and the central axis of the motor shaft is vertical to the longitudinal direction.

3. The reciprocating power tool of claim 1, wherein: the transmission mechanism comprises a transmission gear connected to the lower end of the motor shaft, the upper end of the transmission gear is fixed to the lower end of the motor shaft, the lower end of the transmission gear is meshed with the planetary gears, and the planetary gears are evenly distributed around the circumference of the lower end of the transmission gear.

4. The reciprocating power tool of claim 3, wherein: the planet carrier is equipped with and is located base up end just follows circumference evenly distributed's several round pin post, planetary gear correspond connect in on the round pin post, in order to drive the planet carrier rotates.

5. The reciprocating power tool of claim 3, wherein: the planet carrier is provided with a balancing weight which is positioned on the lower end face of the base, and the balancing weight and the base are integrally formed and are far away from the circle center of the base.

6. The reciprocating power tool of claim 1, wherein: the transmission mechanism comprises a gear box body connected to the shell, the planetary gear and the planet carrier are contained in the gear box body, and the reciprocating rod assembly longitudinally extends out of the gear box body.

7. The reciprocating power tool of claim 6, wherein: the gearbox casing comprises an upper casing body and a lower casing body which are buckled up and down, the upper casing body is accommodated in the casing, and the lower casing body is exposed below the casing.

8. The reciprocating power tool of claim 7, wherein: the transmission mechanism comprises an inner gear ring sleeved on the outer side of the planetary gear, the inner gear ring is fixed in the upper box body, and the planetary gear is internally meshed with the inner gear ring.

9. The reciprocating power tool of claim 7, wherein: the transmission mechanism comprises a supporting bearing which is sleeved on the planet carrier and is arranged on the outer side of the base, and the supporting bearing is fixed in the lower box body to support the planet carrier.

10. The reciprocating power tool of claim 6, wherein: the reciprocating rod assembly comprises a reciprocating rod extending along the longitudinal direction, a cutter chuck positioned at one end of the reciprocating rod in the longitudinal direction and a sliding groove positioned at the other end of the reciprocating rod in the longitudinal direction, and the eccentric pin is connected into the sliding groove so that the planet carrier drives the reciprocating rod assembly to reciprocate.