CN201217102Y

CN201217102Y - Reciprocating power tool

Info

Publication number: CN201217102Y
Application number: CNU2008201190643U
Authority: CN
Inventors: 朱伯元
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2008-06-18
Filing date: 2008-06-18
Publication date: 2009-04-08
Anticipated expiration: 2018-06-18

Abstract

Disclosed is a reciprocating drive tool which comprises a shell(1)arranged along the lengthwise direction, a motor(2) arranged inside the shell, a principal shaft(3)which is arranged perpendicular to the lengthwise direction and is driven by the motor, an eccentric shaft(32)eccentrically connected with the principal shaft, a reciprocating rod(4)which is driven by the eccentric shaft(32)to move reciprocally along the lengthwise direction; wherein, an eccentric block(7)is formed at the top end of the principal shaft, at a phase of 180 degrees with respect to the eccentric shaft(32), and is connected with the eccentric shaft(32)into a whole through a connecting part(33). The connecting part is supported by a balancing block(6) and is provided with a through hole(61). The eccentric block is housed in the through hole. Two sides of the balancing block extend towards the reciprocating rod to develop into two side walls(62.63), and the gravity center of the balancing block is located between the reciprocating rod(4) and the eccentric block(7). In this way, vibration of the whole reciprocating mechanism is reduced to the minimum, so an operator feels more comfortable during operation, and cutting precision and service life of the drive tool are improved.

Description

Reciprocating power tool

Technical field

The utility model relates to a kind of reciprocating power tool, relates to a kind of balanced controls of reciprocating power tool in particular.

Background technology

Reciprocating saw is one of common reciprocating power tool, according to its kind of drive, generally comprises two kinds of drive mechanisms, and a kind of is the oscillating rod type transmission mechanism, and another kind is the eccentric wheel type transmission mechanism.

Adopt the reciprocating saw of eccentric wheel type transmission mechanism, generally include the housing that extends along longitudinally, be arranged on motor in the housing, perpendicular to longitudinally setting and the main shaft that drives by motor, with main shaft by eccentric eccentric shaft that is connected of connecting portion and the reciprocating lever that moved reciprocatingly by the eccentric shaft driving, this reciprocating lever drive saw blade mounted thereto carries out reciprocal cutting action.

Adopt the reciprocating saw of oscillating rod type transmission mechanism, generally include housing, be arranged on motor in the housing, along the fork that connects on longitudinally setting and the jackshaft that drives by motor, this jackshaft and be movably connected in reciprocating lever on the fork along the longitudinally setting.When motor drives the jackshaft rotation, be connected fork on the jackshaft and will drive reciprocating lever and move reciprocatingly, and then make the saw blade that is installed on the reciprocating lever carry out reciprocal cutting action.

In the above-mentioned kind of drive, when reciprocating lever moves back and forth, reciprocating lever all will produce bigger vibration, so that influence cutting accuracy, and cause operator's hand fiber crops easily, and feel tired.So, in reciprocating saw, usually balanced controls can be set; feel because of the numb feel that vibration is brought to reduce reciprocating lever; common balanced controls are balance weight, and this balance weight moves along the opposite direction of the direction of motion of reciprocating lever usually, to suppress reciprocal vibration of bar.

U.S. bulletin patent US 5555626 has disclosed a kind of balanced controls that adopted in the oscillating rod type reciprocating saw, it is at the opposite side of fork with respect to reciprocating lever, extend and be provided with an end, and connect and drive a balance weight that is arranged on housing bottom by this end and slide, like this, fork can also move along the reciprocating direction in contrast to reciprocating lever by the driven equilibrium piece driving the process while that reciprocating lever moves back and forth, and then can eliminate the vibration sense that is brought by the reciprocating lever motion.But the balance weight in the reciprocating saw of this employing oscillating rod type is owing to being arranged on housing bottom, and is far apart with the center of gravity of reciprocating lever, poor for whole reciprocator counterbalance effect, can not play the effect of vibration damping well.Therefore, disclosed along the two side ends of balance weight in this patent and extended upward pair of sidewalls, this balance weight has been opened from its cross section presented U type structure, the center of gravity that such structure can make balance weight is moved on gradually, if sidewall is upwardly extending high more, then the amplitude of moving on the center of gravity is big more.When center of gravity approached the center of gravity of reciprocating lever, the counterbalance effect that this balance weight produced was good more.

But adopting the reciprocating saw of this U type balance weight is the oscillating rod type reciprocating saw, and not can solve the vibration problem of reciprocating lever in the eccentric wheel type reciprocating saw.Therefore, be necessary the balanced controls of eccentric wheel type reciprocating saw are further improved.

The utility model content

The purpose of this utility model is to provide a kind of reciprocating power tool that adopts eccentric wheel type reciprocator, and the balanced controls of this instrument can reduce reciprocating lever effectively and move back and forth the vibration that brings.

For achieving the above object, the utility model provides a kind of reciprocating power tool, comprise the housing that is provided with along longitudinally, be arranged on the motor in the housing, perpendicular to longitudinally setting and the main shaft that drives by motor, the eccentric shaft that is connected with spindle eccentricity, and driven by eccentric shaft and the reciprocating lever that moves reciprocatingly along longitudinally, wherein, the top of main shaft is formed with eccentric block, this eccentric block and eccentric shaft are 180 degree phase place settings and connect as one by a junction, this connecting portion is supported by a balance weight, this balance weight is provided with through hole, described eccentric block is housed in this through hole, the both sides of this balance weight are extended with sidewall towards the direction of reciprocating lever, and the center of gravity that makes described balance weight is between described reciprocating lever and described eccentric block.

Adopt in such a way, in the reciprocating motion process of reciprocating lever, balance weight also produce to slide thereupon, and center of gravity is all the time near the center of gravity of reciprocating lever, thereby has reduced the vibration when reciprocating lever moves reciprocatingly, and helps operator's operation.

Description of drawings

Fig. 1 be the utility model reciprocating power tool cutaway view;

Fig. 2 be among Fig. 1 along A to zoomed-in view;

Wherein, the related elements reference numeral is listed as follows:

The 1-housing; The 2-motor; The 21-motor drive shaft; The 3-main shaft; The 31-bevel gear; The 32-eccentric shaft; The 33-connecting portion; The 4-reciprocating lever; The 41-groove; The 5-saw blade; The 6-balance weight; The 61-through hole; 62,63-sidewall; The 7-eccentric block.

The specific embodiment

Below in conjunction with drawings and the specific embodiments the utility model is described in further detail.

See also Fig. 1, the utility model discloses a kind of reciprocating power tool, in a preferred embodiment, this reciprocating power tool is a reciprocating saw.This reciprocating saw comprises the housing 1 that extends along longitudinally, and this housing 1 definition has the rear and front end, and as shown in Figure 1, the right side is a front end, and the left side is the rear end.Rear end at housing 1 is provided with motor 2 along longitudinally equally, the motor drive shaft 21 output rotation torques of this motor 2; Front end at housing 1 is provided with main shaft 3 perpendicular to longitudinally, and is fixedly connected with bevel gear 31 on main shaft 3, and this bevel gear 31 connects with motor drive shaft 21 engagements, thereby the rotation torque of motor drive shaft 21 is passed to main shaft 3.The top of this main shaft 3 is formed with an eccentric block 7, and be 180 degree phase places with this eccentric block 7, be parallel to this main shaft 3 and be provided with an eccentric shaft 32, connect as one by a connecting portion 33 between this eccentric block 7 and the eccentric shaft 32, connect thereby make eccentric shaft 32 be eccentric with respect to main shaft 3.In addition, connect along groove 41 activities on the reciprocating lever 4 of longitudinally setting in the other end of this eccentric shaft 32 and the housing 1.Thereby when main shaft 3 is rotated, this eccentric shaft 32 will be done eccentric rotation along with the rotation of main shaft 3, and drive reciprocating lever 4 further and move reciprocatingly along longitudinally, make the saw blade 5 that is installed on the reciprocating lever 4 carry out reciprocal cutting action.

This connecting portion 33 is a tabular, and it is parallel to longitudinally, is supported by a balance weight 6 that is arranged in the housing 1, and this balance weight 6 also is tabular, and dual-side is connected with housing 1 slidably, thereby can slide along longitudinally.Be formed with through hole 61 on balance weight 6, be used to accommodate eccentric block 7, that is to say, eccentric block 7 forms end face with balance weight 6 and is connected.Adopt in such a way, when main shaft 3 is rotated, because eccentric block 7 will be done eccentric rotation along with main shaft 3, this eccentric block 7 slides along longitudinally by the end-acted balance weight 6 that will drive with balance weight 6, simultaneously, the eccentric shaft 32 that has 180 degree phase differences with eccentric block 7 will slide in the other direction, promptly when eccentric shaft 32 is positioned at the front end of housing 1, balance weight 6 will slide into the rear end of housing 1, relatively, when eccentric shaft 32 is positioned at the rear end of housing 1, balance weight 6 will slide into the front end of housing 1, thereby can be effectively the reciprocating motion of reciprocating lever 4 be produced balance, suppress the effect of vibration.

See also Fig. 2, because the balance weight 6 here is arranged on the below of connecting portion 33, itself and reciprocating lever 4 have a segment distance H in vertical direction, therefore, the center of gravity of the center of gravity of this balance weight 6 and reciprocating lever 4 is not positioned on the same horizontal plane, thereby damping effect is unsatisfactory.For this reason, this balance weight 6 extends upward two

side

62,63 along its two side ends perpendicular to longitudinally, makes this balance weight 6 be U type shape from its cross section.Adopt in such a way, can be with the center of gravity A of original flat balance weight along being promoted to center of gravity B place perpendicular to longitudinally, and further near the center of gravity C of reciprocating lever 4, under perfect condition, if center of gravity B and C overlap, then the balancing damping best results of balance weight 6.But in actual applications, the center of gravity B of balance weight 6 is accomplished to overlap and be not easy with the center of gravity C of reciprocating lever 4, therefore, in the utility model, the center of gravity B of described balance weight 6 is between reciprocating lever 4 and eccentric block 7.

In the reciprocating motion process of reciprocating lever, balance weight also produce to slide thereupon, and center of gravity is all the time near the center of gravity of reciprocating lever, thereby has reduced the vibration when reciprocating lever moves reciprocatingly, and helps operator's operation.

Claims

1, a kind of reciprocating power tool, comprise the housing (1) that is provided with along longitudinally, be arranged on the motor (2) in the housing, perpendicular to longitudinally setting and the main shaft (3) that drives by motor, the eccentric shaft that is connected with spindle eccentricity (32), and driven by eccentric shaft and the reciprocating lever (4) that moves reciprocatingly along longitudinally, wherein, the top of main shaft is formed with eccentric block (7), this eccentric block and eccentric shaft are 180 degree phase place settings and connect as one by a junction (33), this connecting portion (33) is supported by a balance weight (6), this balance weight is provided with through hole (61), described eccentric block is housed in this through hole, it is characterized in that: the both sides of this balance weight are extended with sidewall (62 towards the direction of reciprocating lever, 63), the center of gravity of described balance weight (6) is positioned between described reciprocating lever (4) and the described eccentric block (7).