CN207841234U - Power tool - Google Patents
Power tool Download PDFInfo
- Publication number
- CN207841234U CN207841234U CN201721919867.2U CN201721919867U CN207841234U CN 207841234 U CN207841234 U CN 207841234U CN 201721919867 U CN201721919867 U CN 201721919867U CN 207841234 U CN207841234 U CN 207841234U
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- Prior art keywords
- outer housing
- power tool
- center
- motor
- gravity
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Abstract
A kind of hand-hold power tool comprising：Motor；Output shaft is driven by the motor and to installment work head；Shell, the shell include outer housing and the inner housing that is at least partially housed in outer housing, and the inner housing at least partly accommodates the motor.The wherein described outer housing is spaced apart with the inner housing, the outer housing has center of gravity, the position of the center of gravity is disposed in in the relevant region of the length of the outer housing, and the geometric center of the region from the outer housing is set out along close to the extension of the direction of the output shaft.It is arranged such and avoids motor tail swing to generate larger swing energy in the front end of geometric center damaging user by being arranged the center of gravity of outer housing.
Description
Technical field
The utility model is related to a kind of power tool, especially a kind of safe and reliable power tool.
Background technology
There is shell, the shell to have in center of gravity and geometry for power tool, such as swing-type power tool, swing-type power tool
The heart, the center of gravity of usual shell and the position of geometric center substantially overlap, therefore the center of gravity of shell is usually located at shell overall length
The middle position of degree.But it is that also rigid connection has the other equipments such as some switch, circuit boards center of gravity rearward on shell again.When
When user uses swing-type power tool, rotational oscillating motion is done due to enclosing axial line around its output shaft, the meeting when cutting workpiece
By reaction force so that shell equally will produce it is slight swing, and amplitude of fluctuation and the axial distance away from output shaft
Directly proportional, position is bigger further away from output shaft amplitude of fluctuation.Rearward due to center of gravity setting, amplitude of fluctuation accordingly becomes larger, vibrational energy
Amount to amplitude proportional is also corresponding becomes larger, the bigger injury to human hand of vibrational energy is bigger.
Therefore it then needs to provide a kind of new power tool, to solve the above problems.
Utility model content
The purpose of this utility model is to provide a kind of power tools, have the advantages that safe and reliable.
To solve the above problems, the technical solution of the utility model is：A kind of hand-hold power tool comprising：Motor；
Output shaft is driven by the motor and to installment work head；Shell, the shell include outer housing and are at least partially housed in
Inner housing in outer housing, the inner housing at least partly accommodate the motor；The wherein described outer housing and the inner housing every
Open up and set, the outer housing have center of gravity, the center of gravity be disposed in in the relevant region of the length of the outer housing, the region
It sets out from the geometric center of the outer housing and extends along close to the direction of the output shaft.
Preferably, the total length of the outer housing center of gravity and the outer housing is relevant is disposed in some region, should
Region extends from the geometric center of the shell along close to the direction of the output shaft, until to the outer housing is corresponded to
20% distance of total length.
Preferably, the region extends up to 10% distance for reaching the corresponding outer housing total length.
Preferably, the center of gravity of the outer housing is disposed on the direction close to output shaft at a distance of the several of the outer housing
The position at what about 20 millimeters of center.
Preferably, several clump weights are additionally provided on the outer housing, the clump weight setting is in outer housing forward end and uniformly
It is symmetrically distributed in datum plane both sides.
Preferably, the density of the clump weight is more than 2.7g/cm3。
Preferably, the clump weight is fixedly mounted on the outer housing.
Preferably, the circuit board of the power tool is arranged on outer housing.
Preferably, the outer housing is equipped with gripping area, the gripping area and the region where the outer housing center of gravity
It overlaps or partially overlaps.
Compared with prior art, the power tool in the utility model, by being arranged the center of gravity of outer housing in geometry
The front end of the heart avoids motor tail swing from generating larger swing energy and is damaged to user.
Description of the drawings
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is the front view of the utility model power tool；
Fig. 2 is sectional view of the power tool shown in FIG. 1 along the directions A-A；
Fig. 3 is the stereogram exploded view of the utility model power tool eccentric stiffener；
Fig. 4 is the front view of the removal inner housing of power tool shown in Fig. 2；
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment the utility model is described in further detail.
The creating conception of the present invention, swing-type power tool and quilt are illustrated in present embodiment by taking swing-type power tool as an example
Claim swing-type power tool.But the power tool of the present invention is not limited to swing-type power tool, can also be rotational power work
Tool, such as sander or electric angle grinder.
Attached drawing 1 being please referred to attached drawing 2, a kind of swing-type power tool includes shell 10, the motor 40 being contained in shell 10,
The output shaft 30 internally extended from shell 10 is mounted on the work head 32 of 30 extending end 31 of output shaft, in output shaft
The clamp assembly 33 of work head is clamped on 30 axial direction.
Shell 10 includes the outer housing 11 being longitudinally extended and the inner housing 12 being at least partially housed in outer housing 11, interior
Shell 12 is spaced apart with outer housing 11.The longitudinal extending axis of 11 substantially rectilinear extension of outer housing, outer housing 11 is X1, interior
12 part of shell is bent from one end opposite shell body 11 of outer housing 11 to be extended.Outer housing has grip zone 20, with for using
The gripping area 20 is grasped during person's guiding tool.
Inner housing 12 includes the motor shell 122 at least partly accommodating the head capsule 121 of output shaft 30, being connect with head capsule 121.By
It is spaced apart in outer housing 11 and inner housing 12, therefore there are gaps 123 between head capsule 121 and outer housing 11.Motor shell 122 is used
In installation motor 40, motor 40 has motor drive shaft 41.Motor shell 122 can be designed to partially or completely coat motor as needed
40.In this example, head capsule 121 is made of metal, and motor shell 122 is made of plastics.Certainly, head capsule 121 and motor shell 122 can
To be made as needed of metal or plastics.Motor shell 122 in the present embodiment consists of two parts, and is separately positioned on motor 40
Both ends and part coat motor 40, the middle section of motor 40 is then uncoated in motor shell 122.And motor shell 122 also may be used
With by being integrally formed, it can coat motor 40 completely at this time.
The axis Y of the longitudinal extending axis X1 and output shaft 30 that are defined through outer housing 11 are mid-plane, that is to say, that
When the longitudinal extending axis X1 of outer housing 11 and the axis Y of output shaft 30 are coplanar, mid-plane is constituted.In the present embodiment, outside
The longitudinal extending axis X1 of shell 11 is approximately perpendicular to the axis Y of output shaft 30.It may occur to persons skilled in the art that outer housing
The 11 longitudinal extending axis X1 and axis Y of output shaft 30 can not also coplanar or coplanar but out of plumb, it is vertical such as outer housing 11
It is parallel with the axis Y of output shaft 30 or in other angles to axis X1 is extended.
With reference to Fig. 2, it is provided with eccentric drive mechanism 60 between motor drive shaft 41 and output shaft 30, passes through eccentric drive mechanism 60
Motor 40 is converted into the pendulum motion that output shaft 30 surrounds own axes Y around the rotary motion of the axis X 2 of itself, is swung
Direction such as figure in shown in arrow R-R.After the free end of output shaft 30 connects different operating head attachments, such as straight blade, circle
Saw blade, triangle frosted disk etc., you can the operations such as cut or grind to realize.
It is defined through plane on the basis of the axis X 2 of motor and the axis Y of output shaft, that is to say, that when the axis X 2 of motor
It is coplanar with the axis Y of output shaft, constitute datum plane.And in the present embodiment, the axis Y of output shaft is approximately perpendicular to motor
Axis X 2.It may occur to persons skilled in the art that the axis Y of the axis X 2 of motor and output shaft can not also be coplanar or coplanar
But out of plumb, as the axis X 2 of motor is parallel with the axis Y of output shaft or is in other angles.
Certainly, in the present embodiment, the longitudinal extending axis X1 weights of the outer housing 11 of the axis X 2 and outer housing 40 of motor
It closes, therefore, datum plane and mid-plane overlap.
It is working face to define work head and move the plane to be formed, and specific to the present embodiment, work head (can be rip
Piece, saw blade etc.) swinging plane for forming the axis Y perpendicular to output shaft is swung with output shaft 30.Swinging plane is considered as
It is that any one straight line perpendicular to output shaft 30 swings the plane formed with output shaft 30 in work head.Therefore, swinging plane
Perpendicular to above-mentioned mid-plane or datum plane.Certainly, it is also conceivable for a person skilled in the art that being directed to rotational power work
Tool, work head to form Plane of rotation as output shaft rotates.
With further reference to Fig. 2 and Fig. 3, eccentric drive mechanism 60 is arranged in head capsule 121, including shift fork 61 and is connected to horse
Up to the offset assembly 62 on axis.Wherein, offset assembly 61 includes being connected to eccentric shaft on motor drive shaft 41 and being mounted on eccentric shaft
Driving wheel 622 on 621.One end of shift fork 61 is connected to the top of output shaft 30, the driving of the other end and offset assembly 62
Wheel 622 matches.Shift fork 61 includes being set in casing 611 on output shaft 30 and from 611 top of casing vertically motor drive shaft
41 horizontal-extending forked portions 612.In present embodiment, driving wheel 622 is ball bearing, has the forked portion with shift fork 61
The spherical outer surface of 612 cooperations.Eccentric shaft 621 is connect with 41 bias of motor drive shaft, i.e. the axis X 3 of eccentric shaft 621 and motor drive shaft
Axis X 2 is misaligned, and the spacing that radial deflection is certain.The forked portion 612 of shift fork 61 is coated on the both sides of driving wheel 622, and
Closely with the outer surface sliding contact of driving wheel 622.
When 40 motor shaft 41 of motor rotates, eccentric shaft 621 is then with respect to motor 40 under the drive of motor drive shaft 41
Axis X 2 is eccentrically rotated, and then driving wheel 622 is driven to be eccentrically rotated with respect to the axis X 2 of motor.Under the drive of driving wheel 622,
Shift fork 61 is swung with respect to the axis Y of output shaft 30, further output shaft 30 is driven to be swung around its own axis Y.Output shaft
30, which swing drive work head mounted thereto, swings to be processed workpiece.
In the present embodiment, the swing angle of output shaft is 5 °.The hunting frequency of output shaft 30 is 18000 times per minute.It is logical
It crosses and the swing angle of output shaft 30 is set as 5 °, substantially increase the working efficiency of work head, and when work head is saw blade
When, it is convenient for the discharge of clast.
It is pointed out that swing-type power tool of the present invention, the swing angle of output shaft 30 are not limited in 5 °, it can be with
It is arranged as required to as the value more than or less than 5 °.The hunting frequency of output shaft 30 is also not necessarily limited to 18000 times per minute, preferably greatly
In 10000 times per minute.
11 half of the utility model power tool outer housing is disclosed please continue to refer to attached drawing 4, the outer housing 11 is by left and right
Two identical half-shells are composed, and left and right half shell 11 is fixedly connected by screw.Outer housing 11 has geometric center P, should
Geometric center is indicated by axis P in Fig. 4, and outer housing 11 also has center of gravity G, usually the center of gravity G of an object
It is overlapped with its geometric center P, but since also rigid connection has speed-regulating switch 13, power switch 14, electricity on outer housing 11
Other devices such as road plate 16, to change the position of outer housing center of gravity G so that 11 center of gravity G of outer housing is relative to outer housing 11
Geometric center P deviate (therefore the application meaning outer housing center of gravity is the center of gravity of housing body components).Specific reference attached drawing 4
It is shown, the center of gravity G of outer housing 11 with the length of outer housing 11 is relevant is arranged in cross section along outer housing axis X 1, the section
It sets out from the geometric center P of outer housing 11 and extends along close to the direction of output shaft 30.I.e. in the longitudinal extending axis of outer housing 11
The center of gravity G of the direction upper outer shell 11 of X1 is located at the front end of 11 geometric center P of outer housing, is arranged such so that user makes
When with tool, swing-type power tool is swung by reaction force, earlier above due to center of gravity setting so that amplitude of fluctuation is larger
The swing energy that end generates reduces, to reduce or avoid the injury to user's hand.
Specific center of gravity G is located in the mid-plane of shell 10 in the up-down direction and on left and right directions.
Preferably, in order to which further such that the center of gravity G of outer housing moves forward, 11 left and right sides of outer housing also contains clump weight
15, in present embodiment, clump weight 15 is fixedly mounted on by rivet on outer housing 11, it is of course possible to it is envisioned that can also lead to
Clump weight 15 and outer housing 11 is crossed to be interference fitted so that clump weight is fixed on outer housing 11, or by the way that clump weight 15 is integrated
It is molded in outer housing 11.In present embodiment, the quantity of clump weight 15 is 2, and uniform setting is left in outer housing 11
Right both sides, i.e. there are two the half-shell of each outer housing 11 is all provided with.The material selection density of clump weight 15 is more than 2.7g/cm3's
Material, optimal density are 7.8g/cm3.The specific can be that zinc die casting alloys.And the weight of clump weight 15 is circuit board 16
0.8-1.2 times of weight, preferred weight are 1.1 times.Such setting and is made outer for the weight of bucking circuit plate 16
The past Forward of the center of gravity of shell 11.In general, with greater weight object in phase for compared to the object with lower weight
With the oscillation or vibration smaller for generating or triggering in trigger process.Therefore, 15 one side of clump weight being additionally arranged increases
The weight of outer housing 11 so that the vibration that user is subject to when being worked using swing-type power tool can reduce, another
Aspect is since clump weight 15 is arranged in the front end of outer housing 11, further such that the center of gravity G of outer housing continues on outer housing 11
Longitudinal extending axis with close to output shaft direction, according to different demands can increase clump weight quantity or size to
Adjust the distance between the center of gravity G and geometric center P of outer housing.
Outer housing 11 is L along the maximum length of 1 extending direction of outer housing axis X, and center of gravity G is disposed in and the shell
In the relevant region of length of body, the geometric center of the region from the outer housing is set out prolongs along the direction close to the output shaft
It stretches, it is preferred that the distance between outer housing center of gravity G and outer housing geometric center P are the 20% of outer housing total length.Further
, the distance between center of gravity G and geometric center P are the 10% of outer housing total length.Between optimal center of gravity G and geometric center P
Distance be 20mm.
Power tool in the utility model avoids electricity by being arranged the center of gravity of outer housing in the front end of geometric center
Drive end unit swings the larger swing energy of generation and is damaged to user.
It may occur to persons skilled in the art that the utility model can also have other realization methods, but as long as its
The technical spirit of use and the utility model are same or similar seemingly or any variations and alternatives made based on the utility model
It is within the protection scope of the utility model.
Claims (10)
1. a kind of power tool comprising：
Motor；
Output shaft is driven by the motor and to installment work head；
Shell, the shell include outer housing and the inner housing that is at least partially housed in outer housing, the inner housing at least portion
Divide receiving the motor；
It is characterized in that：The outer housing is spaced apart with the inner housing, and there is the outer housing center of gravity, the center of gravity to be arranged
With the relevant region of the length of the outer housing in, the geometric center of the region from the outer housing is set out along close to described defeated
The direction of shaft extends.
2. power tool as described in claim 1, it is characterised in that：The region is extended up to corresponding to the outer housing
Total length 20% distance.
3. power tool as claimed in claim 2, it is characterised in that：The region extends up to the corresponding outer housing of arrival
Total length 10% distance.
4. power tool as claimed in claim 3, it is characterised in that:The center of gravity of the outer housing is several at a distance of the outer housing
The position at what 20 millimeters of center.
5. power tool as described in claim 1, it is characterised in that：It is additionally provided with several clump weights on the outer housing, defines
By plane on the basis of the axis of the motor and the axis of the outer housing, clump weight setting is in outer housing forward end and
It is even to be symmetrically distributed in the datum plane both sides.
6. power tool as claimed in claim 5, it is characterised in that：The density of the clump weight is more than 2.7g/cm3。
7. power tool as claimed in claim 6, it is characterised in that：The clump weight is fixedly mounted on the outer housing.
8. power tool as claimed in claim 5, it is characterised in that：The circuit board of the power tool is arranged in outer housing
On.
9. power tool as described in claim 1, it is characterised in that：The outer housing is equipped with gripping area, the grip zone
Domain with where the center of gravity of the outer housing area coincidence or partially overlap.
10. power tool as claimed in claim 8, it is characterised in that：The gross mass of the clump weight is equal to the circuit board
0.8-1.2 times of quality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721919867.2U CN207841234U (en) | 2017-12-29 | 2017-12-29 | Power tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721919867.2U CN207841234U (en) | 2017-12-29 | 2017-12-29 | Power tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207841234U true CN207841234U (en) | 2018-09-11 |
Family
ID=63416501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721919867.2U Active CN207841234U (en) | 2017-12-29 | 2017-12-29 | Power tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207841234U (en) |
-
2017
- 2017-12-29 CN CN201721919867.2U patent/CN207841234U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |