CN207952704U - Hand-hold power tool - Google Patents

Abstract

The utility model provides a kind of hand-hold power tool using high-speed electric expreess locomotive.The power tool includes：Motor is configured to driving rotor and is rotated with per minute at least 50000；Output shaft is used for installment work head；Three-level deceleration mechanism, is connected between rotor and output shaft, be configured to driving output shaft with per minute 600 5000 rotate turn.Under certain power, volume and the rotating speed of motor are in inverse ratio, and the power tool of the utility model uses high-speed electric expreess locomotive so that the volume of power tool reduces, and structure is more compact, and weight is more light, greatly improves the operating comfort of user.

Description

Hand-hold power tool

Technical field

The utility model is related to a kind of hand-hold power tool, especially a kind of hand-hold type power applying high-speed electric expreess locomotive Tool.

Background technology

The weight for reducing hand-hold power tool is allowed to lighter, becomes power tool field and urgently meets for a long time User demand.Motor weight occupies the very big proportion of entire hand-hold power tool weight.However in the past, in motor side Face, has only attempted a little change in design, such as reduced thickness or change the shape of element, but the weight obtained subtracts It is few very little.

Utility model content

The purpose of this utility model is to provide a kind of compact-sized, light hand-hold power tool is operated.

To solve the above problems, the technical solution of the utility model is：A kind of hand-hold power tool, including：Motor, institute It includes stator and rotor to state motor, and the motor, which is configured to the rotor is driven to rotate with per minute at least 50000, to be turned；Output Axis is driven by the motor, is used for installment work head；Deceleration mechanism is connected between the rotor and the output shaft, described Deceleration mechanism slows down for three-level, including the first order is slowed down, the second level is slowed down and the third level is slowed down；The deceleration mechanism is configured to The work head is driven to be rotated with 600-5000 per minute.

Preferably, the module involved by the deceleration mechanism is between 0.7-1.2.

Preferably, the deceleration mechanism includes planetary gear.

Preferably, the motor is DC brushless motor, and the number of poles of the motor is between 6-8.

Preferably, the number of poles of the motor is 6.

Preferably, the motor is DC brushless motor, and the stacking number of the stator core is between 10 and 20.

The power tool of the utility model uses including planetary three-level deceleration mechanism, is not influencing motor Under the premise of energy, rotor speed can be rotated with per minute at least 50000, and in motor field, the volume and rotating speed of motor It is inversely proportional, in this way, the structure of power tool is more compact, weight is also more light, substantially increases the operating comfort of user.

Description of the drawings

Above-described the purpose of this utility model, technical solution and advantageous effect can be realized by following The detailed description of specific embodiment of the utility model is described in combination with attached drawing and is clearly obtained.

Fig. 1 is the front view of representative electric drill according to the present utility model；

Fig. 2 is the vertical view of electric drill in Fig. 1；

Fig. 3 is phantoms of the Fig. 2 along line A-A；

Fig. 4 is phantoms of the Fig. 2 along line B-B；

Fig. 5 is the sectional view of stationary part in Fig. 2；

10, motor 12, deceleration mechanism 14, electric drill

16, shell 18, drill chuck 20, handle

21, battery pack 22, switch 24, drill bit

26, torque cover 28, rotating speed switching gear 30, steering switching switch

32, stator 34, rotor 36, iron core

38, coil 40, rotary shaft 42, bearing

44, motor gear 46, the first gear ring 48, the second gear ring

50, third gear ring 52, the first planetary gear 54, the first straight pin

56, first planet carrier 58, the first sun gear 60, the second planetary gear

62, the second straight pin 64, the second planet carrier 66, secondary sun wheel

68, third planet gear 70, third straight pin 72, output shaft

Specific implementation mode

The preferred embodiment of the utility model is described in detail below in conjunction with the accompanying drawings, so that the advantages of the utility model It can be easier to be readily appreciated by one skilled in the art with feature, it is apparent clear to be made to the scope of protection of the utility model Define.

Power tool is described first before the high-speed electric expreess locomotive 10 of description the utility model and deceleration mechanism 12 referring to Fig. 1 One representative example-electric drill 14.

Electric drill 14 generally includes drill chuck 18, shell 16, motor 10 (not shown), deceleration mechanism 12 (not shown), handle 20 and battery pack 21.Wherein, motor 10 and deceleration mechanism 12 are arranged inside shell 16.It is provided with out on handle 20 22 are closed, is in be turned on and off state for controlling motor 10.When motor 10 is in open state, i.e., switch 22 is pressed by operator Under, the torque that motor 10 exports is transferred on drill chuck 18.Various different brill can be installed as needed on drill chuck 18 First 24, drill chuck 18 drives 24 rotary work of drill bit after receiving the torque transmitted by motor 10.The electric hand drill 14 also wraps The torque cover 26 of the operation range for adjusting drill chuck 18 is included, torque cover is between drill chuck 18 and shell 16；Shell It is additionally provided with rotating speed switching gear 28 on 16 and turns to switching switch 30, wherein rotating speed switching gear 28 is for switching different work Rotating speed turns to switching switch 30 for switching different rotation directions.Fig. 2 shows the vertical views of exemplary electric drill.

Referring now to Fig. 3-4, the internal component including motor 10 and the electric drill of deceleration mechanism 12 14 will be described in greater detail. For convenience's sake, the side where drill chuck 18 is known as " preceding ", and the side where motor 10 is known as " rear ".Preferably, Motor 10 be with stator 32 surround rotor 34 inner-rotor brushless motor, and can drive rotor 34 with it is per minute at least 50000 turns of speed rotation.

Rotor 34 includes the rotary shaft 40 positioned at motor center, and rotary shaft 40 can be revolved by the bearing 42 being maintained in shell 16 The axis of the support turned, rotary shaft 40 is X.The rotation of rotary shaft 40 is ultimately transferred to drill bit 24 via three-level deceleration mechanism 12. Wherein, three-level deceleration mechanism 12 includes：Interference is connected to the motor gear 44 of 40 end of rotary shaft, is fixed at shell 16 Interior the first gear ring 46, the second gear ring 48 and third gear ring 50；It is engaged jointly with motor gear 44 and the first gear ring 46 First planetary gear 52；First straight pin 54 of rotation the first planetary gear 52 of support, is fixedly connected with the first straight pin 54 First planet carrier 56 and the first sun gear 58, the second planet engaged jointly with the first sun gear 58 and the second gear ring 48 Gear 60；Second straight pin 62 of rotation the second planetary gear 60 of support, the second planet being fixedly connected with the second straight pin 62 Frame 64 and secondary sun wheel 66, the third planet gear 68 engaged jointly with secondary sun wheel 66 and third gear ring 50； The third straight pin 70 of rotation support third planet gear 68.The wherein rotating speed and third of the output shaft 72 of rotation support drill bit 24 The rotating speed of straight pin 70 is consistent.The modulus range of three-level deceleration mechanism middle gear is between 0.7-1.2.

The substantially course of work of deceleration mechanism 12 can be described as：After electric drill 14 is opened, motor gear 44 is with rotation Axis 40 rotates, and the first planetary gear 52 for being engaged with is driven to rotate because the first planetary gear 52 simultaneously with the first tooth Circle 46 engages, and the first gear ring 46 is integrally fixed on shell 16, this forces 52 one side of the first planetary gear to surround the On the other hand one straight pin, 54 rotation surrounds X-axis with the first straight pin 54 and revolves round the sun, together wherein revolution is the portion that we are concerned about Point.First planetary gear 52 and the first straight pin 54 surround the speed of X-axis revolution by the first gear ring 46 and motor tooth together The number of teeth of wheel 44 determines, therefore the first gear ring 46, motor gear 44 and the first planetary gear 52 together constitute three-level deceleration The first order in mechanism 12 is slowed down.

First planet carrier 56, the first sun gear 58 are fixedly connected with the first straight pin 54, and the first sun gear 58 is by One straight pin 54 passes to the second planetary gear 60 around the speed of X-axis revolution, and the second planetary gear 60 is in the first sun gear 58 and second gear ring 48 collective effect further aspect surround 62 rotation of the second straight pin, on the other hand with the second straight pin 62 X-axis is surrounded together to revolve round the sun；Second planetary gear 60 and the second straight pin 62 surround the speed of X-axis revolution by the first sun gear 58 and second gear ring 48 the number of teeth determine.Therefore the second gear ring 48, the first sun gear 58 and the second planetary gear 60 are total Slow down with the second level constituted in three-level deceleration mechanism；

Second planet carrier 64, secondary sun wheel 66 are fixedly connected with the second straight pin 62, and secondary sun wheel 66 is by Two straight pins 62 pass to third planet gear 68 around the revolution speed of X-axis, and third planet gear 68 is in secondary sun wheel 66 and third gear ring 50 collective effect further aspect surround 70 rotation of third straight pin, on the one hand with third straight pin 70 1 It rises and revolves round the sun around X-axis；Third planet gear 68 around X-axis revolution speed by third gear ring 50 and secondary sun wheel 66 The number of teeth determines, therefore third gear ring 50, secondary sun wheel 66 and third planet gear 68 constitute three-level deceleration mechanism 12 In the third level slow down.The rotating energy of third planet gear 68 is transmitted to output shaft 72 via third straight pin 70, and final Make 24 rotary work of drill bit.

After slowing down via three-level deceleration mechanism 12, final drill bit 24 is preferably driven with the rotating speed that 600-5000 per minute turns. That is, drill bit 24 is driven with 10% or smaller speed of 40 rotating speed of rotary shaft of motor 10.

The presence of three-level rotating speed mechanism 12 enables power tool using 34 rotating speed of rotor more than 50000 turns per minute High-speed electric expreess locomotive 10；And under motor field, certain power, the rotating speed of motor is in inverse ratio with its volume.The use of high-speed electric expreess locomotive The size for greatly reducing motor thereby reduces the weight of motor and entire power tool.

Fig. 5 shows that number of poles is the sectional view of 6 stator.Stator 32 includes stator core made of multiple stacked steel plates 36.Coil 38 is wrapped in around stator core 36.However such as more multi-pole, 8 or 10 can also be in the utility model Certain ranges in use.

Compared with the brushless motor of the prior art, by reducing the stacking number of stator core, brushless motor can also be reduced Weight.Brushless motor according to the present utility model preferably has 20-40 layers of stator core, and certain 20-60 layers can also be at this It is used in certain ranges of utility model.Also, by the stacking number for reducing stator core, the axis of brushless motor can also be reduced To size.The torque value that the stacking number of stator core depends in part on the size of motor and motor must generate.But it is in office In the case of what, the stator core stacking number of high-speed electric expreess locomotive used by the utility model will all be less than stator in conventional power tool The stacking number of iron core.

In addition, though the electric drill as representative example is only described within a context, but the power tool of this introduction It is not limited to this drill kind tool.For example, this introduction can also be applied to power tools such as electric circular saw and grinder and all Such as scissors, the garden tool sets such as shrub and hedge trimmer.

The embodiment of the utility model, the description thereof is more specific and detailed, but can not therefore be interpreted as to this reality With the limitation of new patent range.It should be pointed out that for those of ordinary skill in the art, not departing from this practicality Under the premise of novel design, various modifications and improvements can be made, these belong to the scope of protection of the utility model.

Claims (7)

1. a kind of hand-hold power tool, it is characterised in that：Including,

Motor, the motor include stator and rotor, and the motor is configured to drive the rotor with per minute at least 50000 It rotates, the stator includes stator core；

Output shaft is driven by the motor, is used for installment work head；

Deceleration mechanism is connected between the rotor and the output shaft, and the deceleration mechanism slows down for three-level, including the first order Slow down, the second level is slowed down and the third level is slowed down；

The deceleration mechanism is configured to that the work head is driven to rotate with 600-5000 per minute.

2. hand-hold power tool as described in claim 1, it is characterised in that：Module involved by the deceleration mechanism Between 0.7-1.2.

3. hand-hold power tool as described in claim 1, it is characterised in that：The deceleration mechanism includes planetary gear.

4. hand-hold power tool as described in claim 1, it is characterised in that：The motor is DC brushless motor, described The number of poles of motor is between 6-8.

5. hand-hold power tool as claimed in claim 4, it is characterised in that：The number of poles of the motor is 6.

6. hand-hold power tool as described in claim 1, it is characterised in that：The motor is DC brushless motor, described Stator core has multiple stacked steel plates, and stacking number is between 20-40.

7. hand-hold power tool as described in claim 1, it is characterised in that：The motor is DC brushless motor, described Stator core has multiple stacked steel plates, and stacking number is between 20-60.