CN1974142A - Electric tool - Google Patents

Abstract

The object of the present invention is to simplify the process of installing a motor upon a shell and improve the productivity and save the cost. In the miller 1, the motor shell 2 accommodating the commutator machine 3 is axially separated into a front and a back part at the outside of the stator 5, i.e. the front shell 14 and the back shell 15, and the stator 5 can be installed on the motor shell 2 by pressing the stator 5 into the back shell 15 and fixing the front shell 14 to the back shell 15 employing the screw with the stator 5 between them.

Description

Electric tool

Technical field

The motor that the present invention relates to become drive source is contained in the electric tool of the grinder in the tubular shell etc.

Background technology

In the electric tool of grinder etc., in the motor case of tubular, accommodate motor (for example with reference to patent documentation 1).The concrete steps that this motor unit is installed in the motor field frame are as follows, that is: at first adopt be pressed into anchor clamps (forcing press) and be pressed into the stator (magnetic field) of motor in the motor case after, the stator screw is fixed in motor case, last assemble rotor.

[patent documentation 1] TOHKEMY 2001-9757 communique

Be pressed into anchor clamps by such employing, the assembling operation of product is relatively wasted time and energy, and is an impediment to the raising of productivity ratio, and causes cost to raise up.

Summary of the invention

So, the objective of the invention is to, provide a kind of the simplification that motor unit is installed to process in the housing, and can suitably expect the raising of productivity ratio and the electric tool that cost reduces.

For achieving the above object, technical scheme 1 described invention is characterised in that, housing is divided into axial front and back two parts on the circumferential position of the stator of motor, and the cutting apart in the housing of any side before and after stator is inserted into, and decide across the housing of cutting apart that the stator screw is fixed to a side from the housing of cutting apart of opposite side, thus fixed stator.

Technical scheme 2 described inventions, on the basis of the purpose of technical scheme 1, even also do not influence outward appearance and usability in order to cut apart housing, and any side is cut apart the side end of cutting apart on the housing in front and back, is formed with to install to opposed opposite side and cut apart the portion that extends on the end of housing outward.

Technical scheme 3 described inventions on the basis of the purpose of technical scheme 1 or 2, to be cut apart housing in order rationally utilizing, and will to be cut apart at least one side double as handle of housing.

According to technical scheme 1 described invention, can not use to be pressed into anchor clamps and just can to carry out the assembling of motor, can reach thus and shorten the required amount of labour of manufacturing operation and the purpose of time.And the screw that the installation stator is used also can be used for cutting apart the assembling of housing, even therefore housing is cut apart, also can not increase the components number and the man-hour of assembling usefulness, thereby can keep the simplification of operation.Thus, improve productivity ratio, and can expect the reduction of manufacturing cost.

According to technical scheme 2 described inventions, on the basis of the effect of technical scheme 1, the partitioning portion of housing can not be exposed, thereby can keep good surface appearance.And, when gripping housing, can not diminish usability yet.

According to technical scheme 3 described inventions, on the basis of the effect of technical scheme 1 or 2, can rationally utilize as handle cutting apart housing.

Description of drawings

Fig. 1 is the longitudinal sectional view of grinder.

Fig. 2 is the vertical view of grinder.

The reference numeral explanation:

1 grinder, 2 motor cases, 3 commutator machines, 4 rotors, 5 stators, 7 gear-boxes, 8 back covers, 13 disc emery wheels, 14 fore shells, 15 back covers, 18 screws, 19 brackets, 20 connecting portions, 21 supports, 25 stage portion, 26 extend portion.

The specific embodiment

Below, based on accompanying drawing embodiments of the present invention are described.

Fig. 1 is a longitudinal sectional view that example is a grinder of electric tool, Fig. 2 is a vertical view, grinder 1 constitutes: motor case 2 the place aheads (left side of Fig. 1) that accommodating commutator machine 3, the shaft bearing plate 6 that carries out the axle supporting via the rotor 4 to commutator machine 3 is assembled with gear-box 7, and is assembled with back cover 8 in the wings.Here, motor case 2, back cover 8 are synthetic resin article, and gear-box 7 is a metallic article.

In gear-box 7, output shaft 9 orthogonal shape ground axle suspension main shafts 10 with the rotor of in gear-box 7, giving prominence to 4, and first bevel gear 11 by being fixed in output shaft 9 front ends, with the engagement of being fixed in second bevel gear 12 of main shaft 10 by one, the rotation of output shaft 9 can be passed on to main shaft 10.Lower end at main shaft 10 outstanding below gear-box 7 is equipped with discoid emery wheel 13 the orthogonal shape.

Motor case 2 is being cut apart by front and back near on the circumferential position at stator 5 rears, and is formed with: fore shell 14, and it is as housing holds stator 5 from the place ahead the major part of cutting apart of a side; Back cover 15, it is as the rear end part that housing is pressed into stator 5 of cutting apart of opposite side.The front end of fore shell 14 is fixed on the gear-box 7 from the place ahead by screw via shaft bearing plate 6, on its side, be provided with sliding button 16, this sliding button 16 is connected with not shown switch in being contained in back cover 8 by connecting rod 17, by under the state that grips fore shell 14, sliding button 16 being carried out slide, can control the open and close of commutator machine 3.And, on the interior week of fore shell 14, be equipped with the bracket 19,19 of the screw 18 of fixed stator 5 ...

On the other hand, back cover 15 has: the connecting portion 20 of the ring-type that is connected with fore shell 14; Be connected with in the rear of connecting portion 20 central authorities and an axle support 21 that the axle supporting is carried out in the rear end of rotor 4, and, can be from the place ahead of the bracket 19 of fore shell 14, be screwed into connecting portion 20 with inserting the front end that leads in the screw 18 of stator 5.Be provided with a pair of brush carrier 23,23 in the back of connecting portion 20, the carbon brush of commutator 22 sliding-contacts of this brush carrier maintenance and rotor 4.The 24th, establish from the axle support 21 of back cover 15 is rearward prominent, and the screw seat portion of back cover for screw stays 8.

And, be arranged with in the rear end of fore shell 14: stage portion 25, its front end with the connecting portion 20 of back cover 15 is mutually opposed; Extend portion 26, it covers the front end outer peripheral portion of connecting portion 20, and connects with the front end of back cover 8.

In the grinder 1 that as above constitutes, when assembling commutator machine 3 in motor case 2, at first on the connecting portion 20 of back cover 15, the hand of personnel selection is filled in the rear end of stator 5 and locate as far as possible gently.Outside the place ahead of stator 5, load onto fore shell 14 then, screw 18 is inserted from the place ahead of bracket 19 led in the stator 5, and be screwed into connecting portion 20.So when being screwed into screw 18, stator 5 is pressed into connecting portion 20 fully, and between bracket 19 and connecting portion 20, be held fixingly, and utilize screw 18 to make fore shell 14 and back cover 15 integrated.At last, come assemble rotor 4 and gear-box 7 with common assembling sequence, back cover 8 gets final product.

Like this, grinder 1 according to aforesaid way, motor case 2 is divided into axial front and back two parts on the circumferential position of stator 5, and stator 5 only is pressed in the back cover 15, and be fixed on the back cover 15 across stator 5 screws from fore shell 14, by fixed stator 5 thus, can not use to be pressed into anchor clamps and can to carry out the assembling of commutator machine 3, and can reach and shorten the required amount of labour of manufacturing operation and the purpose of time.And, because the assembling that the screw 18 of stator 5 usefulness also can be used for front and back housing 14,15 is installed, so even cut apart the components number and the amount of labour that motor case 2 can not increase assembling usefulness yet, and can keep the simplification of operation.Therefore, can expect to boost productivity, realize reducing manufacturing cost.

Especially, on the end of cutting apart side of fore shell 14, be formed with the outer portion that extends 26 that is contained on opposed back cover 15 ends, the partitioning portion of motor case 2 can not be exposed thus, can keep good surface appearance.And, when gripping motor case 2, can not diminish usability yet.

And, because the fore shell 14 double as handles of motor case 2, so can rationally utilize fore shell 14, and operability is used grinder 1 well.

And the side that is pressed into of cutting apart housing is not limited to rear side shown in above-mentioned mode, also can be pressed into front side, and if the portion that is pressed into like that less is set shown in above-mentioned mode, then assembling becomes simple.But, if the load when making assembling because of the axial length of stator etc. is less, then also can set the more portion that is pressed into, for example cut apart etc. in the stator centre.Thus, can be as the housing of cutting apart of double as handle at rear side, also can be in both sides.

And, cut apart housing each other be screwed into direction, have not big harm even be screwed into also from rear side, also can suit to change the structure of bracket for screw stays and inner nut portion etc.

And the portion that extends is set at fore shell in aforesaid way, but also can be arranged at back cover.Certainly, if outward appearance and usability are no problem, also can cancel the portion of extending and the end is docked each other.

On the other hand, divided housing is not limited to synthetic resin article, also can be metallic article, as object of the present invention, is preferably the synthetic resin article that is easy to generate the suction error.

And stator is not limited to and must be pressed into the cutting apart in the housing an of side, and can be according to the difference of material of housing etc., even only the form of Cha Ruing also can be kept effect of the present invention.

In addition, be not limited to grinder as electric tool, so long as motor (being not limited to commutator machine) is contained in the interior device of tubular shell, as other kinds such as sanders, also applicable the present invention.

Claims (3)

1. electric tool by being contained in the stator of the motor in the tubular shell, is inserted in the above-mentioned housing and screw is fixed on the above-mentioned housing and fixes, and this electric tool is characterised in that,

Above-mentioned housing is divided into axial front and back two parts on the circumferential position of said stator, and the cutting apart in the housing of any side before and after said stator only is inserted into, and be fixed to cutting apart on the housing of an above-mentioned side from the housing of cutting apart of opposite side across the said stator screw, thus fixing said stator.

2. electric tool according to claim 1 is characterized in that, in front and back any side cut apart the end of cutting apart side on the housing, be formed with and install to opposed opposite side and cut apart the portion that extends on the end of housing outward.

3. electric tool according to claim 1 and 2 is characterized in that, cuts apart at least one side double as handle of housing.