CN103009343A

CN103009343A - Electric power tool

Info

Publication number: CN103009343A
Application number: CN2012104986970A
Authority: CN
Inventors: 王小勇; 赵祥
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2012-11-29
Filing date: 2012-11-29
Publication date: 2013-04-03
Anticipated expiration: 2032-11-29
Also published as: CN103009343B

Abstract

An electric power tool comprises a casing, a power component, a speed reducing mechanism, an impact mechanism, an actuating mechanism and a damping mechanism. The electric power tool provided by the invention is characterized in that the damping mechanism is arranged between a main shaft and an output shaft and located in a containing hole of the main shaft or the output shaft; the damping mechanism comprises a supporting element and an elastic element which is connected with the supporting element; the supporting element and the elastic element are extruded and assembled into a whole and the clearance between the supporting element and the elastic element is always zero through the automatic adjustment of the elastic element, so that the impact sound generated during the process of shaking the electric power tool is avoided and the friction between the damping mechanism and the main shaft or output shaft is reduced as a result of the point contact between the supporting component and the main shaft or the output shaft, thereby ensuring the rotational efficiency of the output shaft. The electric power tool provided by the invention has the advantages of simple and compact structure and low cost.

Description

Electric tool

Technical field

The present invention relates to a kind of electric tool, particularly a kind of electric tool that impacts class.

Background technology

Impact in the type electric tool product at impact wrench, impact screwdriver, percussion drill etc., thereby affect rotational efficienty in order to prevent that output shaft is stuck, simultaneously since the restriction of level of processing can't guarantee to closely cooperate between output shaft assembly and gear box casing, the main shaft, generally all before and after output shaft, pre-set certain vibration gap, be used for guaranteeing the running of output shaft high efficiency.Rock electric tool before and after ordinary consumer is all habitual when buying, and owing to can produce strike note when cooperating closely before and after the output shaft vibration, thereby allow the consumer think that there are quality problems in product and abandon buying by mistake.

General settling mode has two kinds at present, a kind of is to improve the vibration gap that machining accuracy reduces the output shaft front and back, itself and main shaft and gear box casing are closely cooperated, although this kind mode has solved the problem of output shaft front and back vibrations and can guarantee that output shaft rotates efficiently, but its processing cost is high, and needs higher manufacturing level of processing; Another kind is to fill up buffering spacer between main shaft and the output shaft or between output shaft and the gear box casing, this kind mode also can solve the problem of output shaft front and back vibration, and production cost is low, but because output shaft and buffering spacer close contact, it brings larger frictional resistance will inevitably for the rotation of output shaft, thereby affects the rotational efficienty of output shaft.

Summary of the invention

For addressing the above problem, be necessary to provide a kind of and can prevent before and after the output shaft vibration and to less, the lower-cost electric tool of output shaft rotation effectiveness affects.

A kind of electric tool, comprise housing, power part, reducing gear, beater mechanism, executing agency and damping, described housing comprises procapsid and back casing, procapsid and back casing interconnect, described power part comprises the motor that is arranged on enclosure interior, the clutch end of described motor links to each other with the power intake of described reducing gear, the clutch end of described reducing gear connects described beater mechanism, the output of described beater mechanism links to each other with executing agency, described beater mechanism comprises main shaft, output shaft, hammer body and hammer anvil, described tup sheath is contained on the main shaft, described hammer body can rotate centered by the axis of main shaft and move along axis direction, described hammer anvil is arranged on the output shaft, one end of one of them of described main shaft and output shaft is provided with the protuberance that extends vertically, another a end is provided with the groove that cooperates with described protuberance vertically, realize power transmission by cooperating of hammer body and hammer anvil between described output shaft and main shaft, it is characterized in that: be provided with accepting hole on groove or the protuberance, damping comprises that a flexible member and one support element, described flexible member one end supports in described accepting hole, the other end and the described element butt that supports, the described element that supports supports with the groove or the protuberance that do not offer accepting hole.

Preferably, described flexible member is spring, and supporting element is steel ball, and described flexible member is in compressive state all the time in the whole course of work.

Preferably, described supporting is matched in clearance between element and the accepting hole, and supports element diameter greater than the vibration gap between output shaft and the procapsid and the vibration gap sum between output shaft and the main shaft.

Preferably, described reducing gear is planetary gear reducing mechanism.

Preferably, described protuberance is arranged on the described output shaft, and described accepting hole is arranged on the protuberance of output shaft.

Preferably, described groove is arranged on the described main shaft, and described accepting hole is arranged in the groove of main shaft.

Preferably, described main shaft links to each other with reducing gear, and the end that hammer body is adjacent with hammer anvil is provided with the first claw that cooperates with hammer anvil, is provided with the second claw that matches with the first claw on the described hammer anvil.

Preferably, described beater mechanism also comprises steel ball and spring, described main shaft comprises axis body and is fixedly mounted on two parallel baffles of axis body one end, described main shaft is formed with the V-type groove of placing steel ball, hammer body is the column construction of hollow, and hammer body comprises the driving section that is sleeved on the axis body, and hammer body is formed with the spring placed cavity away from an end inside of hammer anvil, one end of described spring supports in the spring placed cavity, and the other end is held in the baffle plate near hammer body one side.

Preferably, described driving section includes the backstop mouth, and described backstop mouth is arranged on along the rear of the steel ball of axis direction.

Preferably, described output shaft is arranged on the place ahead of described main shaft rotation direction, and the axis of output shaft is consistent with the axis of main shaft; The front portion of described output shaft is formed with the placed cavity that executing agency is installed, and described hammer anvil is installed in output shaft near an end of main shaft, and described hammer anvil is supported on the procapsid by output shaft is rotatable.

Electric tool of the present invention is by arranging damping between main shaft and output shaft, and damping is positioned at the accepting hole of main shaft or output shaft, damping comprise support element with the flexible member that supports element and link to each other, and will support element and be integral with the flexible member press fit and be connected, utilize the automatic adjusting of flexible member so that the gap between output shaft and the housing is always zero, therefore avoided in rocking the process of electric tool, producing strike note, and owing to support element and main shaft or output shaft contacts for putting, reduced the friction between damping and main shaft or the output shaft, thereby guarantee the rotational efficienty of output shaft, electric tool structure of the present invention is simple, compactness, production cost is low.

Description of drawings

Fig. 1 is the perspective view of electric tool of the present invention;

Fig. 2 is the partial sectional view of electric tool the first embodiment of the present invention;

Fig. 3 is the partial view when the first claw separates with the second claw in electric tool the first embodiment of the present invention;

Fig. 4 is the partial view when the first claw cooperates with the second claw in electric tool the first embodiment of the present invention;

Fig. 5 is the partial sectional view of electric tool the second embodiment of the present invention;

Fig. 6 is the three-dimensional exploded view of electric tool subelement of the present invention.

The specific embodiment

In order more to understand technology contents of the present invention, especially exemplified by the specific embodiment and cooperate appended graphic being described as follows.

Please refer to Fig. 1 and Fig. 2, electric tool 10 in the first embodiment of the invention, comprise housing 11, power part 12, reducing gear 13, beater mechanism 14, executing agency 15 and damping 16, as an example of impact screwdriver example electric tool 10 is elaborated in the present embodiment.

Housing 11 comprises procapsid 110 and back casing 111, and procapsid 110 is spirally connected mutually with back casing 111.Be appreciated that connected modes such as also can adopting clamping between procapsid 110 and the back casing 111, so long as procapsid 110 and back casing 111 can be connected into an integral body and easy-to-mount connected mode all should belong to protection scope of the present invention.

Power part 12 links to each other with reducing gear 13, with transmission of power to reducing gear 13, it comprises the motor (not shown) that is arranged on housing 11 inside, the clutch end of motor links to each other with the power intake of reducing gear 13.

Please refer to Fig. 3, the transmission of power that reducing gear 13 is used for power part 12 is provided is to beater mechanism 14, and its clutch end links to each other with beater mechanism 14.In the present embodiment, reducing gear 13 is planetary gear reducing mechanism, it comprises planetary gear 130 and planet carrier 131, in order to keep the steady of transmission, planetary gear 130 is two, and two planetary gears 130 are symmetrically distributed in the planet carrier 131, planet carrier 131 is fixed in the housing 11, planetary gear 130 joins with the power output shaft 120 of motor, be provided with the gear connecting portion 1201 that is meshed with planetary gear 130 on the power output shaft 120 of motor, planetary gear 130 rotation under the drive of power output shaft 120, and along power output shaft 120 revolution of planet carrier 131 around motor.Be appreciated that; reducing gear 13 is not limited to planetary gear reducing mechanism, also can be other reducing gears, for example is with the transmission speed reducer structure; turbine and worm decelerators etc. all should belong to protection scope of the present invention so long as can realize the general reducing gear of the deceleration effect of motor.

Beater mechanism 14 comprises main shaft 140, output shaft 141, hammer body 142, hammer anvil 143, steel ball 144 and spring 145.

Please refer again to Fig. 2 and Fig. 3, main shaft 140 comprises axis body 1400 and two parallel baffles 1401, two parallel baffles 1401 are fixedly mounted on axis body 1400 near an end of reducing gear 13, hammer body 142 is installed in axis body 1400 away from an end of reducing gear 13, and main shaft 140 links to each other with the clutch end of reducing gear 13.Two parallel baffles 1401 surround with axis body 1400 and have formed the circumferential slot 1402 that holds planetary gear 130, planetary gear 130 rotation in circumferential slot 1402, and along 140 revolution of planet carrier 131 drive main shafts.Link to each other by latch 1403 between planetary gear 130 and two parallel baffles 1401 in the present embodiment, thereby drive the rotation of main shaft 140 by the rotation of planetary gear 130.In the present invention, be provided with the pilot hole corresponding with planetary gear 1300 centre bores on two parallel baffles 1401, latch 1403 runs through in the through hole that is comprised of centre bore and pilot hole.Also be formed with the V-type groove 1404 of placing steel ball 144 on the axis body 1400, axis body 1400 axially offers groove 1405 away from an end of reducing gear 13.

Hammer body 142 can rotate centered by the axis of main shaft 140 and move along axis direction, hammer body 142 is the cylindrical structural of hollow, hammer body 142 comprises the driving section 1420 that is sleeved on the axis body 1400, hammer body 142 1 ends are provided with the first claw 1421 that cooperates with hammer anvil 143, and hammer body 142 other end inside are formed with spring placed cavity 1422.

Driving section 1420 is step structure, and driving section 1420 comprises the backstop mouth 1423 of inclination, and backstop mouth 1423 is arranged on steel ball 144 near a side of reducing gear 13.Main shaft 140 is by being arranged on cooperating transmission of power to hammer body 142 between steel ball 144 and the backstop mouth 1423 in the V-type groove 1404.In the side of backstop mouth 1423 away from reducing gear 13, form the passage 1424 that moves for hammer body 142 between driving section 1420 and the main shaft 140.Along in the close process of reducing gear 13 of axis direction, passage 1424 can make steel ball 144 pass through to hammer body 142 on main shaft 140; Along in the process of axis direction away from reducing gear 13, backstop mouth 1423 is by playing position-limiting action with cooperating of steel ball 144, so that cooperatively interacting between the first claw 1421 and the hammer anvil 143 on main shaft 140 for hammer body 142.

Spring 145 1 ends are connected on the bottom surface of spring placed cavity 1422, and the other end offsets with the baffle plate 1401 of close hammer body 142 1 sides, are used for regulating hammer body 142 in the position of axis direction.

Output shaft 141 and main shaft 140 coaxial settings, and contiguous main shaft 140 is provided with an end of hammer body 142.One end of output shaft 141 is formed with for the placed cavity 1410 that executing agency 15 is installed, the other end of output shaft 141 is set with hammer anvil 143 outward, hammer anvil 143 is arranged in the housing 11, hammer anvil 143 is rotatable being supported on the procapsid 110 under the drive of output shaft 141, be provided with the second claw 1431 that matches with the first claw 1421 of hammer body 142 on the hammer anvil 143,140 on output shaft 141 and main shaft are realized power transmission by cooperating of hammer body 142 and hammer anvil 143.Output shaft 141 has extended axially protuberance 1411 near an end of hammer body 142.

Please refer to Fig. 3 and Fig. 4, in course of normal operation, motor by the planetary gear 130 that connects on the power output shaft 120 with transmission of power to main shaft 140, main shaft 140 drives hammer body 142 rotations that arrange on it, hammer body 142 drives hammer anvil 143 by cooperating of the second claw 1431 of arranging on its upper first claw 1421 that arranges and the hammer anvil 143 and rotates, thus 141 rotations of drive output shaft.The first claw 1421 is at symmetrically arranged two flanges of hammer body 142 front ends, and the boss structure of the second claw 1431 for matching with flange, the second claw 1431 drive output shaft 141 and rotate around axis.

When the load of executing agency 15 surpasses certain torque value, hammer body 142 overcomes spring 145 in meeting elastic force along axis direction to reducing gear 13 direction move, so that the first claw 1421 of hammer body 142 separates with the second claw 1431 of hammer anvil 143, this moment, hammer anvil 143 did not temporarily rotate, hammer body 142 is rotated further under the drive of main shaft 140, this moment hammer body 142 on the first claw 1421 in rotation with hammer anvil 143 on the second claw 1431 overlap, after the first claw 1421 turns over certain angle, hammer body 142 can be along axis direction to moving away from the direction of reducing gear 13 under the effect of spring 145, until backstop mouth 1423 tightens mutually with the steel ball 144 that is placed in the V-type groove 1404, the first claw 1421 on the hammer body 142 and the second claw 1431 on the hammer anvil 143 are with again clamping at this moment, and larger circumferential impulsive torque of moment generation, thereby finish impact.

Output shaft 141 cooperatively interacts by the groove 1405 that arranges on the protuberance 1411 that arranges on it and the main shaft 140, damping 16 is arranged between main shaft 140 and the output shaft 141, it comprises flexible member 160 and supports element 161, offer accepting hole 1412 in the protuberance 1411 of output shaft, flexible member 160 1 ends support on accepting hole 1412 end faces, the other end is connected with and supports element 161, and groove 1405 bottom surfaces that support on element 161 and the main shaft 140 join.

Flexible member 160 is Compress Spring, support element 161 and be steel ball, support and be matched in clearance between element 161 and the accepting hole 1412, flexible member 160 is in compressive state all the time in the whole course of work, the gap that has guaranteed to support between groove 1405 bottom surfaces of element 161 and main shaft 140 is always zero, thereby has solved the vibration between output shaft 141 and the main shaft 140.For the ease of assembling, support element 161 diameters greater than vibration gap and output shaft 141 and main shaft 140 the vibration gap sum axial between of output shaft 141 and procapsid in the design 110 between axially, because flexible member 160 is in compressive state, therefore can give and support 161 1 pressure along axis direction of element, support element 161 and promote to closely cooperate between output shaft 141 and the procapsid 110 at axis direction, thereby also solved the vibration problem between output shaft 141 and the procapsid 110.Be steel ball owing to support element 161, support between element 161 and the output shaft 141 as some contact, so can greatly reduce the friction between damping 16 and the output shaft 141, the rotational efficienty of assurance output shaft.

Please refer to Fig. 5, similar as the electric tool 20 in the second embodiment of the present invention and the electric tool 10 in the first embodiment, comprise housing 21, power part 22, reducing gear 23, beater mechanism 24, executing agency 25 and damping 26, damping 26 also comprises flexible member 260 and supports element 261, its main distinction is that accepting hole 2412 is arranged in the protuberance 2405 of main shaft 240, flexible member 260 1 ends support in accepting hole 2412, the other end with support element 261 and be connected, the end face that supports the groove 2411 on element 261 and the output shaft 241 joins.Same flexible member 260 adopts springs, supports element 261 and adopts and support element, and it can both reduce the front and back vibration of output shaft with electric tool 10 in the first embodiment in the situation of the rotational efficienty that guarantees output shaft, thereby reduces the noise of vibration generation.

The above; it is preferred embodiments of the present invention; the present invention is not limited to above-mentioned embodiment; be appreciated that; also can change the structure of output shaft and main shaft; protuberance is arranged on the main shaft; be provided with the groove that matches with protuberance on the output shaft; then accepting hole can be arranged in the protuberance of main shaft or in the groove of output shaft; then spring one end is supported in accepting hole, the other end of spring with support element and link to each other, support the groove floor of element and output shaft or the protuberance end face of main shaft and join; as long as it reaches technique effect of the present invention with identical means, all should belong to protection scope of the present invention.

Claims

1. electric tool, comprise housing, power part, reducing gear, beater mechanism, executing agency and damping, described housing comprises procapsid and back casing, procapsid and back casing interconnect, described power part comprises the motor that is arranged on enclosure interior, the clutch end of described motor links to each other with the power intake of described reducing gear, the clutch end of described reducing gear connects described beater mechanism, the output of described beater mechanism links to each other with executing agency, described beater mechanism comprises main shaft, output shaft, hammer body and hammer anvil, described tup sheath is contained on the main shaft, described hammer body can rotate centered by the axis of main shaft and move along axis direction, described hammer anvil is arranged on the output shaft, one end of one of them of described main shaft and output shaft is provided with the protuberance that extends vertically, another a end is provided with the groove that cooperates with described protuberance vertically, realize power transmission by cooperating of hammer body and hammer anvil between described output shaft and main shaft, it is characterized in that: be provided with accepting hole on groove or the protuberance, damping comprises that a flexible member and one support element, described flexible member one end supports in described accepting hole, the other end and the described element butt that supports, the described element that supports supports with the groove or the protuberance that do not offer accepting hole.

2. electric tool according to claim 1, it is characterized in that: described flexible member is spring, and supporting element is steel ball, and described flexible member is in compressive state all the time in the whole course of work.

3. electric tool according to claim 2 is characterized in that: described supporting is matched in clearance between element and the accepting hole, and supports element diameter greater than the vibration gap between output shaft and the procapsid and the vibration gap sum between output shaft and the main shaft.

4. electric tool according to claim 3, it is characterized in that: described reducing gear is planetary gear reducing mechanism.

5. described electric tool according to claim 1 ~ 4, it is characterized in that: described protuberance is arranged on the described output shaft, and described accepting hole is arranged on the protuberance of output shaft.

6. described electric tool according to claim 1 ~ 4, it is characterized in that: described groove is arranged on the described main shaft, and described accepting hole is arranged in the groove of main shaft.

7. electric tool according to claim 1, it is characterized in that: described main shaft links to each other with reducing gear, and the end that hammer body is adjacent with hammer anvil is provided with the first claw that cooperates with hammer anvil, is provided with the second claw that matches with the first claw on the described hammer anvil.

8. electric tool according to claim 7, it is characterized in that: described beater mechanism also comprises steel ball and spring, described main shaft comprises axis body and is fixedly mounted on two parallel baffles of axis body one end, described main shaft is formed with the V-type groove of placing steel ball, hammer body is the column construction of hollow, hammer body comprises the driving section that is sleeved on the axis body, hammer body is formed with the spring placed cavity away from an end inside of hammer anvil, one end of described spring supports in the spring placed cavity, and the other end is held in the baffle plate near hammer body one side.

9. electric tool according to claim 8, it is characterized in that: described driving section includes the backstop mouth, and described backstop mouth is arranged on along the rear of the steel ball of axis direction.

10. described electric tool according to claim 7 ~ 9, it is characterized in that: described output shaft is arranged on the place ahead of described main shaft rotation direction, and the axis of output shaft is consistent with the axis of main shaft; The front portion of described output shaft is formed with the placed cavity that executing agency is installed, and described hammer anvil is installed in output shaft near an end of main shaft, and described hammer anvil is supported on the procapsid by output shaft is rotatable.