CN214025545U

CN214025545U - Reciprocating electric tool

Info

Publication number: CN214025545U
Application number: CN202022827194.6U
Authority: CN
Inventors: 彭小湖
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-08-24
Anticipated expiration: 2030-11-30

Abstract

A reciprocating power tool includes 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 having a motor shaft extending vertically. The transmission mechanism comprises a first transmission gear and a second transmission gear which are vertically arranged, the first transmission gear and the second transmission gear are connected to the same side of the motor shaft, the first transmission gear is provided with an eccentric pin protruding towards the second transmission gear, the reciprocating rod assembly is located between the first transmission gear and the second transmission gear and connected to the eccentric pin, and the motor drives the reciprocating rod assembly to do reciprocating motion along the longitudinal direction through the transmission mechanism. The two transmission gears are positioned at two sides of the reciprocating rod assembly, so that the transmission gears can reduce the inertia force and can not generate additional moment. Meanwhile, the problem of mutual interference between the motor shaft and the reciprocating rod assembly does not exist, so that the whole structure is more compact, and a user can hold the motor shaft and the reciprocating rod assembly conveniently.

Description

Reciprocating electric tool

[ technical field ]

The utility model relates to an electric tool technical field, in particular to reciprocating type electric tool who reduces vibration.

[ 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 rotating motion of a motor into the reciprocating motion of a reciprocating rod through various transmission mechanisms (such as an eccentric wheel, a bevel gear, a swing rod and the like). In a reciprocating electric tool, a counterweight is usually added to a transmission mechanism to serve as a vibration reduction structure, and a centrifugal force generated during rotation of the counterweight and an inertia force generated during reciprocation of a reciprocating rod are offset with each other, so that a vibration reduction effect is achieved. However, the centrifugal force and the inertia force are not on the same axis, and the two forces generate additional moment when mutually offset. Meanwhile, the existing reciprocating electric tool has an overlarge overall structure due to the existence of the vibration reduction structure, the distance between the control switch and a workpiece is relatively far, and the control switch is not easy to control, so that a user can easily feel tired after holding the 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 type electric tool, it does not produce extra moment when reducing inertial force, has compact structure and the effect of the operation of being convenient for simultaneously.

The utility model provides a technical scheme that prior art problem adopted is: a reciprocating power tool includes a housing, a motor located within the housing, a drive mechanism driven by the motor, and a reciprocating rod assembly driven by the drive mechanism, the motor having a motor shaft extending vertically. The transmission mechanism comprises a first transmission gear and a second transmission gear which are vertically arranged, the first transmission gear is connected with the second transmission gear on the same side of the motor shaft, the first transmission gear is provided with an eccentric pin which extends towards the second transmission gear, the reciprocating rod assembly is located between the first transmission gear and the second transmission gear and connected with the eccentric pin, and the motor drives the reciprocating rod assembly to do reciprocating motion along the longitudinal direction.

The further improvement scheme is as follows: the first transmission gear and the second transmission gear have the same rotation axis, and the rotation axis is parallel to the central axis of the motor shaft.

The further improvement scheme is as follows: the eccentric pin is located on the inner end face of the first transmission gear and far away from the circle center of the first transmission gear, the first transmission gear is provided with a first balancing weight located on the outer end face of the first transmission gear, and the first balancing weight and the first transmission gear are integrally formed and are far away from the circle center of the first transmission gear.

The further improvement scheme is as follows: the second transmission gear is provided with a second balancing weight which is positioned on the outer end face of the second transmission gear, and the second balancing weight and the second transmission gear are integrally formed and vertically arranged corresponding to the first balancing weight.

The further improvement scheme is as follows: the transmission mechanism comprises a gear box body positioned in the shell, the first transmission gear and the second transmission gear are accommodated 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 transmission mechanism comprises a first support shaft penetrating through the circle center of the first transmission gear and a second support shaft penetrating through the circle center of the second transmission gear, and the first support shaft and the second support shaft have the same central axis.

The further improvement scheme is as follows: one end of the first supporting shaft is rotatably connected to the first transmission gear, and the other end of the first supporting shaft is fixedly connected to the gear box body; one end of the second support shaft is rotatably connected to the second transmission gear, and the other end of the second support shaft is fixedly connected to the gear box body.

The further improvement scheme is as follows: the gearbox casing includes last box and lower box of upper and lower lock, first back shaft fixed connection to go up the box, just second back shaft fixed connection to box down.

The further improvement scheme is as follows: the motor shaft is provided with a free tail end protruding into the gear box body, the motor is provided with a motor shaft tooth located at the free tail end of the motor shaft, and the first transmission gear and the second transmission gear are meshed with the motor shaft tooth simultaneously.

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 first transmission gear 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 first transmission gear and a second transmission gear which are vertically arranged, the first transmission gear and the second transmission gear are connected to the same side of the motor shaft, the first transmission gear is provided with an eccentric pin protruding towards the second transmission gear, the reciprocating rod assembly is located between the first transmission gear and the second transmission gear and connected to the eccentric pin, and the motor drives the reciprocating rod assembly to do reciprocating motion along the longitudinal direction through the transmission mechanism. The two transmission gears are positioned at two sides of the reciprocating rod assembly, so that the transmission gears can reduce the inertia force and can not generate additional moment. Meanwhile, a motor shaft of the motor is meshed with the side edges of the two transmission gears instead of between the two transmission gears, namely, the problem of mutual interference between the motor shaft and the reciprocating rod assembly does not exist, so that the two transmission gears can be designed to be smaller and more compact, the overall structure of the reciprocating electric tool is more compact, 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 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 housing space 12, grip 120, second housing space 13, control button 14, second grip 2, motor 21, motor shaft 22, motor shaft teeth 23, upper end bearing 24, lower end bearing 3, transmission mechanism 31, gear housing 32, upper housing 33, lower housing 34, sliding sleeve 4, first transmission gear 41, eccentric pin 42, first weight 43, first support shaft 5, second transmission gear 52, second weight 53, second support shaft 6, power supply module 7, baffle 8, reciprocating lever module 81, reciprocating lever 82, tool chuck 83, sliding groove

[ 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 (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 a cutter attachment in a reciprocating motion.

Referring to fig. 1-2, the reciprocating power tool 100 includes a housing 1, a motor 2 disposed in the housing 1, a transmission 3 driven by the motor 2, and a reciprocating rod assembly 8 driven by the transmission 3, wherein the tool attachment is connected to the reciprocating rod assembly 8. The housing 1 is formed with a receiving space for mounting components such as a motor 2 and a transmission mechanism 3, the motor 2 is used for providing power to the reciprocating electric tool 100, and the transmission mechanism 3 is used for transmitting the power of the motor 2 to the cutter attachment so as to drive the cutter attachment 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 power tool 100 further includes a power supply unit 6 for supplying power to the motor 2 and a baffle 7 provided at a front side of the tool attachment, and in this embodiment, the power supply unit 6 is embodied as a battery pack attached to a rear end of the housing 1 in a 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 11 of the housing 1 is further formed with a second grip portion 14 located at the front portion of the distal end thereof and adapted to 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 5, the motor 2 is located above the transmission mechanism 3 and includes a motor shaft 21 with a free end protruding into the transmission mechanism 3 and a motor shaft tooth 22 located at the free end of the motor shaft 21, and the motor shaft 21 extends vertically. In the present embodiment, the motor shaft teeth 22 are integrally formed on the motor shaft 21 by machining, but in other embodiments, the motor shaft teeth 22 may be a pinion gear that is assembled and fixed to the free end of the motor shaft 21. 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 5, the transmission mechanism 3 includes a gear housing 31, and a first transmission gear 4 and a second transmission gear 5 accommodated in the gear housing 31. The gear housing 31 is located in the housing 1 and includes an upper housing 32 and a lower housing 33 that are engaged with each other, and the upper housing 32 and the lower housing 33 may be connected and fixed to the main body 11 by fasteners such as screws. In this embodiment, the motor shaft 21 passes through the upper case 32 to protrude into the gear case 31, the reciprocating lever assembly 8 longitudinally extends forward out of the lower case 33 of the gear case 31, and the baffle 7 is connected to the longitudinal front end of the lower case 33 of the gear case 31 and longitudinally protrudes forward of the reciprocating lever assembly 8.

The first transmission gear 4 and the second transmission gear 5 are vertically arranged and connected to the same side of the motor shaft 21, and in the embodiment, the first transmission gear 4 is located above the second transmission gear 5. The first transmission gear 4 and the second transmission gear 5 have the same rotation axis, that is, the first transmission gear 4 and the second transmission gear 5 are coaxial, and the rotation axis is parallel to the central axis of the motor shaft 21, so that the first transmission gear 4 and the second transmission gear 5 are simultaneously engaged with the motor shaft tooth 22 of the motor 2.

First drive gear 4 is equipped with eccentric pin 41 that is located on the inner terminal surface of first drive gear 4 and is located first balancing weight 42 on the outer terminal surface of first drive gear 4, promptly eccentric pin 41 sets up respectively in the vertical both sides of first drive gear 4 with first balancing weight 42. The eccentric pin 41 is far away from the circle center of the first transmission gear 4 and extends towards the second transmission gear 5, and the first balancing weight 42 is far away from the circle center of the first transmission gear 4 and is integrally formed with the first transmission gear 4.

The second transmission gear 5 is provided with a second balancing weight 52 located on the outer end face of the second transmission gear 5, the second balancing weight 52 and the second transmission gear 5 are integrally formed and vertically arranged corresponding to the first balancing weight 42, namely, the second balancing weight and the first balancing weight are vertically and symmetrically arranged. The first weight block 42 and the second weight block 52 are disposed to counteract the inertia force generated by the reciprocating rod assembly 8 during the reciprocating motion.

The reciprocating rod assembly 8 is positioned between the first transmission gear 4 and the second transmission gear 5 and connected to the eccentric pin 41, and the motor 2 drives the reciprocating rod assembly 8 to reciprocate along the longitudinal direction through the transmission mechanism 3. The two transmission gears are located at two sides of the reciprocating rod assembly 8, so that the first transmission gear 4 and the second transmission gear 5 can not generate extra moment while reducing the inertia force, thereby achieving the effect of reducing the vibration of the reciprocating electric tool 100.

Referring to fig. 5, the first transmission gear 4 includes a first support shaft 43 passing through a center of the first transmission gear 4, the second transmission gear 5 includes a second support shaft 53 passing through a center of the second transmission gear 5, and the first support shaft 43 and the second support shaft 53 have the same central axis. Specifically, one end of the first support shaft 43 is rotatably connected to the first transmission gear 4, and the other end is fixedly connected to the upper case 32 of the gear case 31; one end of the second support shaft 53 is rotatably connected to the second transmission gear 5, and the other end is fixedly connected to the lower case 33 of the gear case 31.

Therefore, the first transmission gear 4 and the second transmission gear 5 are connected to the gear box 31, and the motor shaft 21 is located on the same side of the first transmission gear 4 and the second transmission gear 5. Therefore, the motor shaft 21 of the motor 2 is meshed with the sides of the two transmission gears instead of between the two transmission gears, that is, the problem of mutual interference between the motor shaft 21 and the reciprocating rod assembly 8 does not exist, and therefore, the first transmission gear 4 and the second transmission gear 5 can be designed to be smaller and more compact, so that the overall structure of the reciprocating electric tool 100 is more compact, the size of the reciprocating electric tool 100 is reduced, and the reciprocating electric tool is convenient for a user to hold.

In this embodiment, the reciprocating rod assembly 8 includes a reciprocating rod 81 extending along a longitudinal direction, a tool chuck 82 located at one longitudinal end of the reciprocating rod 81, and a sliding groove 83 located at the other longitudinal end of the reciprocating rod 81, and the tool accessory is connected and fixed to the tool chuck 82. The eccentric pin 41 is coupled to the sliding groove 83 so that the first transmission gear 4 drives the reciprocating lever assembly 8 to reciprocate. 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 81 passes through the sliding sleeve 34 and reciprocates in the longitudinal direction.

The utility model discloses in, drive mechanism 3 includes along the vertical first drive gear 4 and the second drive gear 5 of arranging the setting, first drive gear 4 is connected in same one side of motor shaft 21 with second drive gear 5, just first drive gear 4 is equipped with towards the protruding eccentric pin 41 of second drive gear 5, reciprocating rod subassembly 8 is located between first drive gear 4 and the second drive gear 5 and connects in eccentric pin 41, motor 2 drives reciprocating rod subassembly 8 through drive mechanism 3 and vertically makes reciprocating motion. Two transmission gears are located at both sides of the reciprocating lever assembly 8 so that the transmission gears do not generate additional moment while reducing the inertial force. Meanwhile, the motor shaft 21 of the motor 2 is meshed with the sides of the two transmission gears instead of between the two transmission gears, that is, the problem of mutual interference between the motor shaft 21 and the reciprocating rod assembly 8 does not exist, so that the two transmission gears can be designed to be smaller and more compact, the overall structure of the reciprocating electric tool 100 is more compact, the size of the reciprocating electric tool 100 is reduced, and the reciprocating electric 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 within the housing, the motor having a vertically extending motor shaft, a drive mechanism driven by the motor, and a reciprocating rod assembly driven by the drive mechanism; the method is characterized in that: the transmission mechanism comprises a first transmission gear and a second transmission gear which are vertically arranged, the first transmission gear is connected with the second transmission gear on the same side of the motor shaft, the first transmission gear is provided with an eccentric pin which extends towards the second transmission gear, the reciprocating rod assembly is located between the first transmission gear and the second transmission gear and connected with the eccentric pin, and the motor drives the reciprocating rod assembly to do reciprocating motion along the longitudinal direction.

2. The reciprocating power tool of claim 1, wherein: the first transmission gear and the second transmission gear have the same rotation axis, and the rotation axis is parallel to the central axis of the motor shaft.

3. The reciprocating power tool of claim 1, wherein: the eccentric pin is located on the inner end face of the first transmission gear and far away from the circle center of the first transmission gear, the first transmission gear is provided with a first balancing weight located on the outer end face of the first transmission gear, and the first balancing weight and the first transmission gear are integrally formed and are far away from the circle center of the first transmission gear.

4. The reciprocating power tool of claim 3, wherein: the second transmission gear is provided with a second balancing weight which is positioned on the outer end face of the second transmission gear, and the second balancing weight and the second transmission gear are integrally formed and vertically arranged corresponding to the first balancing weight.

5. The reciprocating power tool of claim 1, wherein: the transmission mechanism comprises a gear box body positioned in the shell, the first transmission gear and the second transmission gear are accommodated in the gear box body, and the reciprocating rod assembly longitudinally extends out of the gear box body.

6. The reciprocating power tool of claim 5, wherein: the transmission mechanism comprises a first support shaft penetrating through the circle center of the first transmission gear and a second support shaft penetrating through the circle center of the second transmission gear, and the first support shaft and the second support shaft have the same central axis.

7. The reciprocating power tool of claim 6, wherein: one end of the first supporting shaft is rotatably connected to the first transmission gear, and the other end of the first supporting shaft is fixedly connected to the gear box body; one end of the second support shaft is rotatably connected to the second transmission gear, and the other end of the second support shaft is fixedly connected to the gear box body.

8. The reciprocating power tool of claim 7, wherein: the gearbox casing includes last box and lower box of upper and lower lock, first back shaft fixed connection to go up the box, just second back shaft fixed connection to box down.

9. The reciprocating power tool of claim 5, wherein: the motor shaft is provided with a free tail end protruding into the gear box body, the motor is provided with a motor shaft tooth located at the free tail end of the motor shaft, and the first transmission gear and the second transmission gear are meshed with the motor shaft tooth simultaneously.

10. The reciprocating power tool of claim 1, 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 first transmission gear drives the reciprocating rod assembly to reciprocate.