CN101941201A

CN101941201A - Power tool

Info

Publication number: CN101941201A
Application number: CN2009101645192A
Authority: CN
Inventors: 霍立祥
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2009-07-03
Filing date: 2009-07-03
Publication date: 2011-01-12
Anticipated expiration: 2029-07-03
Also published as: CN101941201B

Abstract

The invention relates to a power tool which comprises a head shell and a machine shell. The machine shell is internally provided with a motor and a transmission mechanism, an output shaft extends from the head shell and can be driven by the motor to make rotary oscillating movement around a self axis through torque transferring of the transmission mechanism, the head shell is provided with two ports, one port extends outwards to be provided with a circular lateral wall which is encircled to form a containing space, and the output shaft is arranged in the containing space and arranged in the central position of the loop relative to the lateral wall. The power tool also comprises an elastic element which is likewise arranged in the containing space and respectively and radially connected with the output shaft and the lateral wall. By the action of the elastic element, the invention can fully absorb vibration generated on the output shaft and vibration which is transferred from an asymmetric balancer attachment to the output shaft so as to further obviously lessen the vibration which is transferred to the head shell by the output shaft, greatly solve the problem of hand numbness of a user because of the vibration in the use process and improve the comfort degree of operation.

Description

Power tool

Technical field

The present invention relates to a kind of power tool, especially a kind of swing class power tool of hand-held.

Background technology

Multi Role Aircraft is the common swing class power tool of industry, because its output shaft is done rotational oscillating motion around axial line.Therefore, after different annex working heads is being installed on the output shaft, can realize multiple different operating function, as sawing, cut, grind, scrape etc., to adapt to different work requirements.

Comparatively common in the market Multi Role Aircraft generally comprises motor, and the motor drive shaft of motor is connected with cam pin, is arranged with bearing on cam pin, thereby constitutes an eccentric wheel structure.When motor drive shaft rotated, eccentric wheel structure can be done off-centre around the axial line of motor drive shaft and rotatablely move.The output shaft of Multi Role Aircraft is perpendicular to the motor drive shaft setting, on output shaft, be fixedly coupled a pull-fork assembly, pull-fork assembly is formed with two relative adjutages, eccentric wheel structure is surrounded, two adjutages inboard all with eccentric wheel structure in bearing closely contact, thereby when eccentric wheel was done off-centre and rotated, eccentric wheel structure can drive the oscillating motion on the shift fork generation horizontal direction, by the fixedlying connected of shift fork and output shaft, make output shaft center on its axial line and do rotary oscillation again.Like this, after the free end of output shaft was connected with different annex working heads, as straight blade, saw blade, triangle frosted dish etc., Multi Role Aircraft promptly can be realized multiple operation.

But, because in eccentric wheel structure, cam pin is set for the eccentric, in whole motion process, inevitably can produce bigger vibrations because of wobbler action, this vibrations can act on the eccentric wheel structure always and be subjected on the pull-fork assembly of eccentric wheel driving.Therefore, feel, be unfavorable for that the user uses, also be harmful to user's hand health if the user under the situation of long-time use Multi Role Aircraft, can produce bigger numb feel.

For this reason, in U.S. Pat 6926595B, a solution has been proposed, it has disclosed a kind of damping, promptly correspondingly between the inboard of the outside of shift fork and housing be provided with a pair of spring, the two ends of spring are connected to the inboard and shift fork outside of housing, thereby when shift fork is done oscillating motion, the vibrations meeting elder generation that eccentric wheel structure produces is through the spring absorption and weaken, be passed on the housing again, user's numb feel feel is reduced greatly.

But, what this damping modes mainly solved is bare machine or employing symmetrical balance formula annex working head, as the vibration problems under the situations such as triangle frosted dish, if the user has adopted a kind of annex working head of asymmetric balanced type, as straight blade, this damping modes just can't play cushioning effect.Because, the application point of straight blade is positioned at a side of output shaft, himself is unbalanced in swing process, also can bring bigger vibrations, and this vibrations meeting is passed on the housing by output shaft, causes the user in the long-time sensation of using the back to produce numb hand equally.

Therefore, be necessary to develop a kind of power tool in fact, to address the above problem.

Summary of the invention

The object of the present invention is to provide a kind of power tool, can effectively reduce the vibrations that produce on the output shaft, also can reduce simultaneously annex by asymmetric balanced type and be passed to vibrations on the output shaft.

For achieving the above object, the invention provides a kind of power tool, comprise head capsule and casing, wherein casing inside is provided with motor and transmission mechanism, extend output shaft in the head capsule, described output shaft is under the driving of motor, moment of torsion transmission through transmission mechanism, can do rotational oscillating motion around himself axis, described head capsule has two ports, and one of them port extension is provided with sidewall, and sidewall in the form of a ring, its containing is formed with a receiving space, described output shaft is arranged in the receiving space, and is positioned at the center of ring with respect to sidewall, and described power tool also comprises flexible member, what described flexible member was same is arranged in the receiving space, and respectively radially be connected on the output shaft and sidewall on.

Wherein, described flexible member is a pair of spring, and it is symmetric arrangement with respect to output shaft.

Described spring is along the axis setting perpendicular to the center line of head capsule.

The two ends of described spring are connected with first stator and second stator respectively, and wherein, first stator is connected with the sidewall of receiving space, and second stator is connected with output shaft.

Described first stator and second stator all have two faces, extend on the face to be provided with boss to connect spring, extend on the another side to be provided with latch.

On the sidewall of described receiving space symmetry be provided with two accepting grooves, and each accepting groove is provided with fixing hole, the latch on described first stator can insert in the fixing hole on the accepting groove.

Described output shaft is provided with fixing hole, and the latch on described second stator can insert in the fixing hole on the output shaft.

Described flexible member comprises shell fragment or rubber blanket.

Power tool among the present invention, owing to be provided with flexible member in the receiving space that on the end face of head capsule, forms, and this flexible member is connected with the sidewall of output shaft and receiving space respectively, thereby the vibrations that can effectively absorb on the output shaft to be produced, and be passed to vibrations on the output shaft by asymmetric balance annex, and then the vibrations that output shaft is passed on the head capsule obviously weaken, and have improved the user greatly and have in use shaken numb hand problem, have improved the comfort level of operation.

Description of drawings

Fig. 1 is the schematic perspective view of the preferred embodiments of the present invention medium power instrument, and at this moment, the sealing ring in the head capsule removes.

Fig. 2 is the decomposing schematic representation of the head capsule part of Fig. 1.

Fig. 3 is the vertical view of head capsule part.

Fig. 4 is the cutaway view of Y-axis line in Fig. 3.

Fig. 5 a is the duty reference diagram of the preferred embodiments of the present invention, at this moment, output shaft along the diagram in A direction rotary oscillation, and be arranged in the coordinate quadrant that constitutes by the XY axis, the spring section of second quadrant is contraction state, the spring section of first quartile is extended state, and four-quadrant spring section is contraction state, and the spring section of third quadrant is extended state.

Fig. 5 b is the duty reference diagram of the preferred embodiments of the present invention, at this moment, output shaft along the diagram in B direction rotary oscillation, and be arranged in the coordinate quadrant that constitutes by the XY axis, the spring section of third quadrant is contraction state, four-quadrant spring section is extended state, and the spring section of first quartile is contraction state, and the spring section of second quadrant is extended state.

Related elements reference numeral in the diagram is as follows:

10, Multi Role Aircraft 11, head capsule 12, casing

14, output shaft 15, fixing hole

20, receiving space 21, sidewall 22, accepting groove

23, fixing hole 24, first stator 25, face

26, boss 27, face 28, latch

29, second stator 30, spring

The specific embodiment

The present invention is described in further detail below in conjunction with drawings and the specific embodiments.

See also Fig. 1, power tool disclosed in this invention specifically is a kind of swing class power tool, and promptly Multi Role Aircraft 10, comprises roughly being head capsule 11 and the roughly tubular casing 12 that angle is provided with, and links together by screw between the two.Be provided with motor (figure does not show) in casing 12, be provided with transmission device (figure does not show) and output shaft 14 in head capsule 11, output shaft 14 has axial line L.Described transmission device is connected with motor, the rotation torque of motor output can be converted to the rotational oscillating motion of output shaft 14 around its axial line L, shown in double-head arrow direction among Fig. 1.After the free end of output shaft 14 is connected with different annex working heads,, promptly can realize operations such as cutting or grinding as straight blade, saw blade, triangle frosted dish etc.

See also Fig. 2, head capsule 11 comprises two ports, and one of them port and casing 12 are fixedlyed connected by screw, and in another port, then extend the sidewall 21 that is provided with ring-type, and sidewall 21 contains and is formed with a receiving space 20.Output shaft 14 is arranged in this receiving space 20, and is positioned at its shaft core position with respect to annular sidewall 21.In receiving space 20, on the sidewall 21 of output shaft 14, along axis X (seeing also Fig. 3) direction perpendicular to head capsule 11, symmetry be provided with accepting groove 22, and the center of each accepting groove 22 is provided with fixing hole 23.In accepting groove 22, can insert one first stator 24.Described first stator 24 roughly is square, and has two

faces

25,27, extends circular boss 26 on a face 25 of output shaft 14, then is provided with latch 28 on another face 27.When first stator 24 was inserted in the accepting groove 22, latch 28 can be inserted in the fixing hole 23.Same, on output shaft 14 also symmetry be provided with a pair of fixing hole 15, one

second stator

29 and 14 dismountable connections of output shaft, second stator 29 roughly also is square, its structure and first stator 24 are roughly the same, also have two faces, and, on the side of output shaft 14, be provided with latch respectively, and on another side, be provided with circular boss.In addition, also be provided with a spring 30 respectively between one first stator 24 and one second stator 29, the two ends of spring 30 are connected to boss 26 and second stator, 29 convex platforms on first stator 24.Thereby a pair of spring 30 is in the described receiving space 20 of being housed in of symmetric form, as shown in Figure 3 and Figure 4.

In Fig. 3, according to the axis X of head capsule 11 and the axis Y of spring 30, can constitute a plane right-angle coordinate, the origin of coordinates is the intersection point of axis X, Y, simultaneously along initial point and the axial line L that is output shaft 14 that extends perpendicular to this plane right-angle coordinate.Comprise four quadrants in this plane right-angle coordinate, from upper rightly being defined as first quartile, being rotated counterclockwise and being defined as second quadrant, third quadrant and four-quadrant respectively.

See also Fig. 5 a and Fig. 5 b, in Fig. 5 a, with respect to initial position rotary oscillation certain angle, angle is less than 3 ° along clockwise direction for output shaft 14.The initial position here is defined as the position of output shaft among Fig. 3 14 with respect to head capsule 11, and at this moment, relative vertical angles of the orthohexagonal on the output shaft 14 just in time are positioned on the X of axis.After output shaft 14 rotations, the part that spring 30 is positioned at second quadrant of plane coordinate system is compressed, and the part in the first quartile then is extended state; Simultaneously, the part that spring 30 is positioned at four-quadrant is compressed, and the part in the third quadrant then is extended state.In Fig. 5 b, with respect to initial position rotary oscillation certain angle, angle is less than 3 ° along counterclockwise for output shaft 14.At this moment, the part that spring 30 is positioned at the third quadrant of plane coordinate system is compressed, and the part in the four-quadrant then is extended state; Simultaneously, the part that spring 30 is positioned at first quartile is compressed, and the part in second quadrant then is extended state.Like this, no matter be the vibrations that the eccentric gearing of transmission device causes, the still vibrations that cause of uneven annex all absorb by spring 30 and weaken, thus the vibrations that are passed on the head capsule 11 will reduce greatly, can effectively improve user's operational comfort.

Need to prove that the spring 30 that is adopted can also be other flexible members that can realize equivalent effect, as shell fragment, rubber blanket etc. here.

Claims

1. power tool, comprise head capsule (11) and casing (12), wherein casing (12) inside is provided with motor and transmission mechanism, extend output shaft (14) in the head capsule (11), described output shaft (14) is under the driving of motor, moment of torsion transmission through transmission mechanism, can do rotational oscillating motion around himself axis, it is characterized in that: described head capsule (11) has two ports, one of them port extension is provided with sidewall (21), sidewall (21) in the form of a ring, its containing is formed with a receiving space (20), described output shaft (14) is arranged in the receiving space (20), and be positioned at the center of ring with respect to sidewall (21), described power tool also comprises flexible member, and what described flexible member was same is arranged in the receiving space (20), and respectively radially be connected that output shaft (14) is gone up and sidewall (21) on.

2. power tool as claimed in claim 1 is characterized in that: described flexible member is a pair of spring (30), and it is symmetric arrangement with respect to output shaft (14).

3. power tool as claimed in claim 2 is characterized in that: described spring (30) is along the axis setting perpendicular to the center line of head capsule (11).

4. power tool as claimed in claim 3, it is characterized in that: the two ends of described spring (30) are connected with first stator (24) and second stator (29) respectively, wherein, first stator (24) is connected with the sidewall (21) of receiving space (20), and second stator (29) is connected with output shaft (14).

5. power tool as claimed in claim 4, it is characterized in that: described first stator (24) and second stator (29) all have two faces (25,27), a face (25) is gone up to extend and is provided with boss (26) to connect spring (30), and another side (27) is gone up to extend and is provided with latch (28).

6. power tool as claimed in claim 5, it is characterized in that: what the sidewall (21) of described receiving space (20) was gone up symmetry is provided with two accepting grooves (22), and each accepting groove (22) is provided with fixing hole (23), and the latch (28) on described first stator (24) can insert in the fixing hole (23) on the accepting groove (22).

7. power tool as claimed in claim 6 is characterized in that: described output shaft (14) is provided with fixing hole (15), and the latch on described second stator (29) can insert in the fixing hole (15) on the output shaft (14).

8. power tool as claimed in claim 1 is characterized in that: described flexible member comprises shell fragment or rubber blanket.